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5

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Multiscale Analysis for the Bio-Heat Transfer Equation (2003)

Hochmuth, Reinhard ; Deuflhard, Peter

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Publication Date: 2014-02-26

Description: The bio-heat transfer equation is a macroscopic model for describing the heat transfer in microvascular tissue. In [{\sl Deuflhard, Hochmuth 2002}] the authors applied homogenization techniques to derive the bio-heat transfer equation as asymptotic result of boundary value problems which provide a microscopic description for microvascular tissue. Here those results are generalized to a geometrical setting where the regions of blood are allowed to be connected. Moreover, asymptotic corrector results are derived.

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6

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Polyhedral Investigations on Stable Multi-Sets (2003)

Koster, Arie M.C.A. ; Zymolka, Adrian

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Publication Date: 2014-11-10

Description: Stable multi-sets are an evident generalization of the well-known stable sets. As integer programs, they constitute a general structure which allows for a wide applicability of the results. Moreover, the study of stable multi-sets provides new insights to well-known properties of stable sets. In this paper, we continue our investigations started in [{\sl Koster and Zymolka 2002}] and present results of three types: on the relation to other combinatorial problems, on the polyhedral structure of the stable multi-set polytope, and on the computational impact of the polyhedral results. First of all, we embed stable multi-sets in a framework of generalized set packing problems and point out several relations. The second part discusses properties of the stable multi-set polytope. We show that the vertices of the linear relaxation are half integer and have a special structure. Moreover, we strengthen the conditions for cycle inequalities to be facet defining, show that the separation problem for these inequalities is polynomial time solvable, and discuss the impact of chords in cycles. The last result allows to interpret cliques as cycles with many chords. The paper is completed with a computational study to the practical importance of the cycle inequalities. The computations show that the performance of state-of-the-art integer programming solvers can be improved significantly by including these inequalities.

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7

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Formation and structure of quasi-static cloud-layers in brown dwarf atmospheres (2003)

Woitke, Peter ; Helling, Christiane

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Publication Date: 2014-02-26

Description: In this paper, first solutions of the dust moment equations developed in [{\sl Woitke & Helling 2002}] for the description of dust formation and precipitation in brown dwarf and giant gas planet atmospheres are presented. We consider the special case of a static brown dwarf atmosphere, where dust particles continuously nucleate from the gas phase, grow by the accretion of molecules, settle gravitationally and re-evaporate thermally. Applying a kinetic description of the relevant microphysical and chemical processes for TiO$_2$-grains, the model makes predictions about the large-scale stratification of dust in the atmosphere, the depletion of molecules from the gas phase, the supersaturation of the gas in the atmosphere as well as the mean size and the mass fraction of dust grains as function of depth. Our results suggest that the nucleation occu in the upper atmosphere where the gas is cool, strongly depleted, but nevertheless highly supersaturated ($S\!\gg\!1$). These particles settle gravitationally and populate the warmer layers below, where the in-situ formation (nucleation) is ineffective or even not possible. During their descent, the particles grow up to radii $\approx\!0.3\,\mu{\rm m}\,...\,150\,\mu{\rm m}$, depending gas around the cloud base. The particles finally sink into layers which are sufficiently hot to cause their thermal evaporation. Hence, an effective transport mechanism for condensable elements exi considered solid/liquid material. In the stationary case studied here, this downward directed element transport by precipitating dust grains is balanced by an upward directed flux of condensable elements from the deep interior of the star via convective mixing (no dust without mixing). We find a self-regulation mechanism which leads to an approximate phase equilibrium ($S\!\approx\!1$) around the cloud base. The mass fraction of dust present in the atmosphere results be to approximately given by the mass fraction of condensable elements in the gas being mixed up.

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8

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Visualization of Time-Dependent Adaptive Mesh Refinement Data (2003)

Kähler, Ralf ; Hege, Hans-Christian

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Publication Date: 2020-03-09

Description: Analysis of phenomena that simultaneously occur on quite different spatial and temporal scales require adaptive, hierarchical schemes to reduce computational and storage demands. For data represented as grid functions, the key are adaptive, hierarchical, time-dependent grids that resolve spatio-temporal details without too much redundancy. Here, so-called AMR grids gain increasing popularity. For visualization and feature identification/tracking, the underlying continuous function has to be faithfully reconstructed by spatial and temporal interpolation. Well designed interpolation methods yield better results and help to reduce the amount of data to be stored. We address the problem of temporal interpolation of AMR grid data, e.g.\ for creation of smooth animations or feature tracking. Intermediate grid hierarchies are generated by merging the cells on all refinement levels that are present in the key frames considered. Utilizing a clustering algorithm a structure of nested grids is induced on the resulting collection of cells. The grid functions are mapped to the intermediate hierarchy, thus allowing application of appropriate interpolation techniques.

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9

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Tensor Splats (2003)

Benger, Werner ; Hege, Hans-Christian

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Publication Date: 2020-03-09

Description: An improved general-purpose technique for the visualization of symmetric positive definite tensor fields of rank two is described. It is based on a splatting technique that is built from tiny transparent glyph primitives which are capable to incorporate the full directional information content of a tensor. The result is an information-rich image that allows to read off the preferred directions in a tensor field at each point of a three-dimensional volume or two-dimensional surface. It is useful for analyzing slices or volumes of a three-dimensional tensor field and can be overlayed with standard volume rendering or color mapping. The application of the rendering technique is demonstrated on general relativistic data and the diffusion tensor field of a human brain.

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10

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A construction for non-rank facets of stable set polytopes of webs (2003)

Pêcher, Arnaud ; Wagler, Annegret

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Publication Date: 2014-11-10

Description: Graphs with circular symmetry, called webs, are relevant for describing the stable set polytopes of two larger graph classes, quasi-line graphs [{\sl Giles and Trotter 1981, Oriolo 2001}] and claw-free graphs [{\sl Galluccio and Sassano 1997, Giles and Trotter 1981}]. Providing a decent linear description of the stable set polytopes of claw-free graphs is a long-standing problem [{\sl Grötschel, Lov\'asz, and Schrijver 1988}]. However, even the problem of finding all facets of stable set polytopes of webs is open. So far, it is only known that stable set polytopes of webs with clique number $\leq 3$ have rank facets only [{\sl Dahl 1999, Trotter 1975}] while there are examples with clique number $\geq 4$ having non-rank facets [{\sl e.g. Liebling et al. 2003, Oriolo 2001, P\^echer and Wagler 2003}]. In this paper, we provide a construction for non-rank facets of stable set polytopes of webs. We use this construction to prove, for several fixed values of $\omega$ including all odd values at least 5, that there are only finitely many webs with clique number $\omega$ whose stable set polytopes admit rank facets only.

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11

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Automatic Construction of Boundary Parametrizations for Geometric Multigrid Solvers (2003)

Sander, Oliver ; Krause, Rolf

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Publication Date: 2020-11-13

Description: We present an algorithm that constructs parametrizations of boundary and interface surfaces automatically. Starting with high-resolution triangulated surfaces describing the computational domains, we iteratively simplify the surfaces yielding a coarse approximation of the boundaries with the same topological type. While simplifying we construct a function that is defined on the coarse surface and whose image is the original surface. This function allows access to the correct shape and surface normals of the original surface as well as to any kind of data defined on it. Such information can be used by geometric multigrid solvers doing adaptive mesh refinement. Our algorithm runs stable on all types of input surfaces, including those that describe domains consisting of several materials. We have used our method with success in different fields and we discuss examples from structural mechanics and biomechanics.

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12

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Combinatorial Packing Problems (2003)

Borndörfer, Ralf

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Publication Date: 2020-08-05

Description: This article investigates a certain class of combinatorial packing problems and some polyhedral relations between such problems and the set packing problem.

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13

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Small Examples of Non-Constructible Simplicial Balls and Spheres (2003)

Lutz, Frank H.

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Publication Date: 2014-02-26

Description: We construct non-constructible simplicial $d$-spheres with $d+10$ vertices and non-constructible, non-realizable simplicial $d$-balls with $d+9$ vertices for $d\geq 3$.

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14

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A Lagrangian Approach for Integrated Network Design and Routing in IP Networks (2003)

Bley, Andreas

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Publication Date: 2014-11-11

Description: We consider the problem of designing a network that employs a non-bifurcated shortest path routing protocol. The network's nodes and the set of potential links are given together with a set of forecasted end-to-end traffic demands. All relevant hardware components installable at links or nodes are considered. The goal is to simultaneously choose the network's topology, to decide which hardware components to install on which links and nodes, and to find appropriate routing weights such that the overall network cost is minimized. In this paper, we present a mathematical optimization model for this problem and an algorithmic solution approach based on a Lagrangian relaxation. Computational results achieved with this approach for several real-world network planning problems are reported.

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15

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Comparing Restoration Concepts using Optimal Network Configurations with Integrated Hardware and Routing Decisions (2003)

Orlowski, Sebastian ; Wessäly, Roland

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Publication Date: 2014-02-26

Description: We investigate the impact of link and path restoration on the cost of telecommunication networks. The surprising result is the following: the cost of an optimal network configuration is almost independent of the restoration concept if (i) the installation of network elements (ADMs, DXCs, or routers) and interface cards, (ii) link capacities, and (iii) working and restoration routings are simultaneously optimized. We present a mixed-integer programming model which integrates all these decisions. Using a branch-and-cut algorithm (with column generation to deal with all potential routing paths), we solve structurally different real-world problem instances and show that the cost of optimal solutions is almost independent of the used restoration concept. In addition, we optimize spare capacities for given shortest working paths which are predetermined with respect to different link metrics. In comparison to simultaneous optimization of working and restoration routings, it turns out that this approach does not allow to obtain predictably good results.

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16

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Average Case Analysis of a Hard Dial-a-Ride Problem (2003)

Coja-Oghlan, Amin ; Krumke, Sven ; Nierhoff, Till

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Publication Date: 2020-11-13

Description: In the dial-a-ride-problem (DARP) objects have to be moved between given sources and destinations in a transportation network by means of a server. The goal is to find a shortest transportation for the server. We study the DARP when the underlying transportation network forms a caterpillar. This special case is strongly NP-hard in the worst case. We prove that in a probabilistic setting there exists a polynomial time algorithm which almost surely finds an optimal solution. Moreover, with high probability the optimality of the solution found can be certified efficiently. We also examine the complexity of the DARP in a semi-random setting and in the unweighted case.

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17

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Asymptotic Mesh Independence of Newton's Method Revisited (2003)

Weiser, Martin ; Schiela, Anton ; Deuflhard, Peter

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Publication Date: 2019-01-29

Description: The paper presents a new affine invariant theory on asymptotic mesh independence of Newton's method in nonlinear PDEs. Compared to earlier attempts, the new approach is both much simpler and more natural from the algorithmic point of view. The theory is exemplified at collocation methods for ODE boundary value problems and at finite element methods for elliptic PDE problems.

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18

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Smoothening Helps: A Probabilistic Analysis of the Multi-Level Feedback Algorithm (2003)

Becchetti, Luca ; Leonardi, Stefano ; Marchetti-Spaccamela, Alberto ; [et al.]

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Publication Date: 2014-02-26

Description: In this paper we introduce the notion of smoothed competitive analysis of online algorithms. Smoothed analysis has been proposed by [{\sl Spielman and Teng} STOC 2001] to explain the behaviour of algorithms that work well in practice while performing very poorly from a worst case analysis point of view. We apply this notion to analyze the Multi-Level Feedback (MLF) algorithm to minimize the total flow time on a sequence of jobs released over time when the processing time of a job is only known at time of completion. The initial processing times are integers in the range $[1,2^K]$. We use a partial bit randomization model, where the initial processing times are smoothened by changing the $k$ least significant bits under a quite general class of probability distributions. We show that MLF admits a smoothed competitive ratio of $O(max((2^k/\sigma)^3, (2^k/\sigma)^2 2^K-k))$, where $\sigma$ denotes the standard deviation of the distribution. In particular, we obtain a competitive ratio of $O(2^K-k)$ if $\sigma = \Theta(2^k)$. %The analysis holds for an oblivious as well as for a stronger adaptive %adversary. We also prove an $\Omega(2^{K-k})$ lower bound for any deterministic algorithm that is run on processing times smoothened according to the partial bit randomization model. For various other smoothening models, including the additive symmetric smoothening model used by [{\sl Spielman and Teng}], we give a higher lower bound of $\Omega(2^K)$. A direct consequence of our result is also the first average case analysis of MLF. We show a constant expected ratio of the total flow time of MLF to the optimum under several distributions including the uniform distribution.

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19

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A sample path relation for the sojourn times in G/G/1-PS systems and its applications (2003)

Brandt, Andreas ; Brandt, Manfred

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Publication Date: 2014-11-11

Description: For the general G/G/1 processor sharing (PS) system a sample path result for the sojourn times in a busy period is proved, which yields a relation between the sojourn times under PS and FCFS discipline. In particular, the result provides a formula for the mean sojourn time in G/D/1-PS in terms of the mean sojourn time in the corresponding G/D/1-FCFS, generalizing known results for GI/M/1 and M/GI/1. Extensions of the formula provide the basis for a two-moment approximation of the mean sojourn time in G/GI/1-PS in terms of a related G/D/1-FCFS.

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20

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Molecular Conformation Dynamics and Computational Drug Design (2003)

Deuflhard, Peter ; Schütte, Christof

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Publication Date: 2014-02-26

Description: The paper surveys recent progress in the mathematical modelling and simulation of essential molecular dynamics. Particular emphasis is put on computational drug design wherein time scales of $msec$ up to $min$ play the dominant role. Classical long-term molecular dynamics computations, however, would run into ill-conditioned initial value problems already after time spans of only $psec=10^{-12} sec$. Therefore, in order to obtain results for times of pharmaceutical interest, a combined deterministic-stochastic model is needed. The concept advocated in this paper is the direct identification of metastable conformations together with their life times and their transition patterns. It can be interpreted as a {\em transfer operator} approach corresponding to some underlying hybrid Monte Carlo process, wherein short-term trajectories enter. Once this operator has been discretized, which is a hard problem of its own, a stochastic matrix arises. This matrix is then treated by {\em Perron cluster analysis}, a recently developed cluster analysis method involving the numerical solution of an eigenproblem for a Perron cluster of eigenvalues. In order to avoid the 'curse of dimension', the construction of appropriate boxes for the spatial discretization of the Markov operator requires careful consideration. As a biomolecular example we present a rather recent SARS protease inhibitor.

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21

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Nonlinear Optimization in Gas Networks (2003)

Ehrhardt, Klaus ; Steinbach, Marc

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Publication Date: 2021-02-01

Description: The operative planning problem in natural gas distribution networks is addressed. An optimization model focusing on the governing PDE and other nonlinear aspects is presented together with a suitable discretization for transient optimization in large networks by SQP methods. Computational results for a range of related dynamic test problems demonstrate the viability of the approach.

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22

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RNA 3D-Modeling (2003)

Boit, Alice ; Cordes, Frank

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Publication Date: 2014-02-26

Description: This article presents a new computational approach to the three-dimensional (3D) modeling of ribonucleic acid (RNA) sequences with unknown spatial structure. The main concept is a mapping of the query sequence onto the 3D structures of a suitable template RNA molecule. This technique called \textit{threading} has originally been developed for the modeling of protein 3D structures. The application to RNA systems bridges the information gap between the growing mass of RNA sequence data and the relatively limited number of available 3D structures. The new RNA threading method is demonstrated on a tRNA model system because sufficient representative 3D structures have experimentally been elucidated and deposited in the public databases. Nevertheless, the method is in principle transferable on all other RNA species. Algorithms are developed that decompose these template structures into their secondary structure elements and gather this information in a specific template database. The best template is chosen with public alignment and secondary structure prediction tools which are integrated in the RNA modeling module. The structural information gathered from the template and the best alignment is combined to establish a comprehensive 3D model of the query sequence. A range of complete tRNA structures has successfully been modeled with the RNA threading method. The prototype module visualizes the models and provides convenient access to the proposed 3D structures. Therefore, the method could give new insight into a variety of RNA systems which in the recent years have become increasingly important as potential new pharmaceutical agents.

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23

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Korean-German Bilateral Symposium on Scientific Computing (2003)

Deuflhard, Peter ; (Chairs), Hyung Yong Ra (Chairs)

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Publication Date: 2014-02-26

Description: Collection of abstracts of the Korean-German Bilateral Symposium on Scientific Computing, Berlin January 15/16, 2004

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24

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Planung kostenoptimaler Informations- und Kommunikations-Infrastrukturen (2003)

Bley, Andreas ; Zymolka, Adrian

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Publication Date: 2014-11-11

Description: Beim Entwurf und Ausbau von Informations- und Kommunikationsnetzwerken m{ü}ssen zahlreiche interdependente Entscheidungen getroffen und gleichzeitig mannigfaltige Bedingungen ber{ü}cksichtigt werden. Die verf{ü}gbaren technischen und organisatorischen Alternativm{ö}glichkeiten sind normalerweise so vielf{ä}ltig und komplex, dass eine manuelle Planung praktisch nicht m{ö}glich ist. In diesem Artikel wird das Potential und die Methodik der mathematischen Optimierung bei der kostenoptimalen Planung von Kommunikationsnetzen vorgestellt. Als Ausgangspunkt wird exemplarisch eine typische praktische Aufgabe, die Struktur- und Konfigurationsplanung mehrstufiger Telekommunikationsnetzwerke, dargestellt. Anschließend werden kurz die wesentlichen Modellierungstechniken und Verfahrensans{ä}tze der mathematischen Optimierung skizziert. Abschließend gehen wir auf die Planung einer ad{ä}quaten Informations- und Kommunikations- Infrastruktur f{ü}r ein dezentrales Energieversorgungsnetz ein.

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Chromatic Scheduling Polytopes coming from the Bandwidth Allocation Problem in Point-to-Multipoint Radio AccessSystems (2003)

Marenco, Javier ; Wagler, Annegret

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Publication Date: 2020-08-05

Description: Point-to-Multipoint systems are one kind of radio systems supplying wireless access to voice/data communication networks. Such systems have to be run using a certain frequency spectrum, which typically causes capacity problems. Hence it is, on the one hand, necessary to reuse frequencies but, on the other hand, no interference must be caused thereby. This leads to the bandwidth allocation problem, a special case of so-called chromatic scheduling problems. Both problems are NP-hard, and there exist no polynomial time approximation algorithms with a guaranteed quality. One kind of algorithms which turned out to be successful for many other combinatorial optimization problems uses cutting plane methods. In order to apply such methods, knowledge on the associated polytopes is required. The present paper contributes to this issue, exploring basic properties of chromatic scheduling polytopes and several classes of facet-defining inequalities.

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Optimization Methods for UMTS Radio Network Planning (2003)

Eisenblätter, Andreas ; Fügenschuh, Armin ; Geerdes, Hans-Florian ; [et al.]

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Publication Date: 2020-02-11

Description: The UMTS radio network planning problem poses the challenge of designing a cost-effective network that provides users with sufficient coverage and capacity. We describe an optimization model for this problem that is based on comprehensive planning data of the EU project MOMENTUM. We present heuristic mathematical methods for this realistic model, including computational results.

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27

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Assessing Capacity Improvements by Relaying in Cellular Networks (2003)

Geerdes, Hans-Florian

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Publication Date: 2014-02-26

Description: Relaying -- allowing multiple wireless hops -- is a protocol extension for cellular networks conceived to improve data throughput. Its benefits have only been quantified for small example networks. For assessing its general potential, we define a complex resource allocation\slash{}scheduling problem. Several mathematical models are presented for this problem; while a time-expanded MIP approach turns out intractable, a sophisticated column generation scheme leads to good computational results. We thereby show that for selected cases relaying can increase data throughput by 30\% on the average.

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28

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Minimum Converter Wavelength Assignment in All-Optical Networks (2003)

Koster, Arie M.C.A. ; Zymolka, Adrian

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Publication Date: 2014-02-26

Description: Finding conflict-free wavelength assignments with a minimum number of required conversions for a routing of the lightpaths is one of the important tasks within the design of all-optical networks. We consider this problem in multi-fiber networks with different types of WDM systems. We give a detailed description of the problem and derive its theoretical complexity. For practical application, we propose several sequential algorithms to compute appropriate wavelength assignments. We also perform computational experiments to evaluate their performance. For the iterative algorithms, we identify characteristic patterns of progression. Two of these algorithms qualify for application in practice.

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29

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Rigid body docking for Virtual Screening (2003)

May, Andreas ; Eisenhardt, Steffen ; Schmidt-Ehrenberg, Johannes ; [et al.]

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Publication Date: 2014-09-30

Description: A recently developed algorithm allows Rigid Body Docking of ligands to proteins, regardless of the accessibility and location of the binding site. The Docking procedure is divided into three subsequent optimization phases, two of which utilize rigid body dynamics. The last one is applied with the ligand already positioned inside the binding pocket and accounts for full flexibility. Initially, a combination of geometrical and force-field based methods is used as a Coarse Docking strategy, considering only Lennard-Jones interactions between the target and pharmaceutically relevant atoms or functional groups. The protein is subjected to a Hot Spot Analysis, which reveals points of high affinity in the protein environment towards these groups. The hot spots are distributed into different subsets according to their group affiliation. The ligand is described as a complementary point set, consisting of the same subsets. Both sets are matched in $\mathrm{I\!R}^{3}$, by superimposing members of the same subsets. In the first instance, steric inhibition is nearly neglected, preventing the system's trajectory from trapping in local minima and thus from finding false positive solutions. Hence the exact location of the binding site can be determined fast and reliably without any additional information. Subsequently, errors resulting from approximations are minimized via finetuning, this time considering both Lennard-Jones and Coulomb forces. Finally, the potential energy of the whole complex is minimized. In a first evaluation, results are rated by a reduced scoring function considering only noncovalent interaction energies. Exemplary Screening results will be given for specific ligands.

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30

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Integrated Optimization of Hardware Configuration and Capacity. Dimensioning in SDH and opaque WDM networks (2003)

Kröller, Alexander ; Wessäly, Roland

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Publication Date: 2014-02-26

Description: We suggest a new model for the design of telecommunication networks which integrates decisions about the topology, configuration of the switching hardware, link dimensioning, and protected routing of communication demands. Applying the branch-and-cut-algorithm implemented in our network planning and optimization tool DISCNET, we demonstrate that real-world based network planning instances of such an enhanced model can be solved.

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31

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Verteilter Dokumenten-Speicher, Erfahrungen mit den Kluwer-Daten des Friedrich-Althoff-Konsortiums (2003)

Koch, Thorsten

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Publication Date: 2020-02-11

Description: Dieser Bericht beschreibt die Erfahrungen und Schlussfolgerungen,die im Rahmen der VDS-Vorstudie bei der Speicherung der vom Friedrich-Althoff-Konsortium lizenzierten Zeitschriften des Kluwer-Verlages gewonnen wurden.

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32

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Endnutzerbasierte Online-Fernleihe im KOBV - Kurzbeschreibung (2003)

Kuberek, Monika ; Lohrum, Stefan ; Rascanu, Raluca

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Publication Date: 2020-11-13

Description: Der KOBV setzt für die endnutzerbasierte Online-Fernleihe den Sisis ZFL-Server (Zentraler Fernleih-Server) ein. Mit dem Einsatz des ZFL-Servers können in den Bibliotheken echte Rationalisierungseffekte erzielt werden: Der Server ist in der Lage, Fernleih-Bestellungen an lokale Systeme zu übergeben, so dass sie im lokalen System automatisch - ohne Eingreifen von Bibliotheksmitarbeitern - weiterverarbeitet werden können. Im KOBV können derzeit Sisis- und Aleph-Lokalsysteme diese Schnittstelle voll bedienen. Andere Bibliothekssysteme im KOBV, die diese Schnittstelle nicht bedienen können, werden mittels eines E-Mail-Verfahrens in die Online-Fernleihe integriert. Die vorliegende Kurzbeschreibung der Online-Fernleihe im KOBV soll - im Gegensatz zur Spezifikation, die möglichst vollständig sein sollte - einen leicht verständlichen Einblick in die Abläufe der Online-Fernleihe vermitteln. Nach einem Überblick über zu erwartende Rationalisierungseffekte ist der Ablauf einer Online-Fernleih-Bestellung - veranschaulicht durch eine Graphik mit dem technischen Aufbau im KOBV - kurz dargestellt. \vspace{6mm} {\it Hinweis:} Die von einer Arbeitsgruppe des KOBV erstellte Spezifikation zur Online-Fernleihe ist als ZIB Report 02-30 auf dem Preprint-Server des ZIB veröffentlicht. Siehe: Monika Kuberek (Red.) {\begin{rawhtml} 〈a href="http://www.zib.de/Publications/Reports/ZR-02-30.pdf"〉 〈i〉 Spezifikation für eine Verbund-Fernleih-Software im KOBV〈/i〉 〈/a〉 \end{rawhtml}}

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33

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Improved Perron Cluster Analysis (2003)

Weber, Marcus

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Publication Date: 2014-02-26

Description: The problem of clustering data can often be transformed into the problem of finding a hidden block diagonal structure in a stochastic matrix. Deuflhard et al. have proposed an algorithm that state s the number $k$ of clusters and uses the sign structure of $k$ eigenvectors of the stochastic matrix to solve the cluster problem. Recently Weber and Galliat discovered that this system of eigenvectors can easily be transformed into a system of $k$ membership functions or soft characteristic functions describing the clusters. In this article we explain the corresponding cluster algorithm and point out the underlying theory. By means of numerical examples we explain how the grade of membership can be interpreted.

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34

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Zur Zugriffskontrolle im KOBV (2003)

Litsche, Stefan

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Publication Date: 2014-02-26

Description: Mit der Entwicklung des KOBV-Informationsportals soll den Benutzern in der Region Berlin-Brandenburg ein verbesserter Zugang zu Informationsressourcen geboten werden. Einen wesentlichen Anteil diese Auf der Grundlage der Analyse der Rahmenbedingungen werden Anforderungen an die Zugriffskontrolle im KOBV definiert und Lösungsmöglichkeiten auf der Ebene allgemeiner Modelle diskutiert.

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35

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Navigation in the KOBV-Informationsportal Conceptual View (2003)

Brodersen, Maren ; Hodoroaba, Lavinia

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Publication Date: 2014-02-26

Description: The KOBV Informationsportal aims to be a universal gateway to the sources of information hosted by the partner libraries from the Berlin-Brandenburg area. Due to the large number of these sources, an intuitive navigation is an essential component of the portal. The navigation-component should preserve the partner libraries? independence and overcome their administrative and technical differences. This paper proposes a collection-level navigation with four dimensions: the sources? subject areas (e.g. the first two levels of DDC), the sources? type (e.g. e-journals, databases, OPACs, etc.), the sources? location (e.g. Berlin, Brandenburg) / the library that hosts that source and the sources? accessing state (e.g. free, restricted, etc.).

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36

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Polynomial Inequalities Representing Polyhedra (2003)

Bosse, Hartwig ; Grötschel, Martin ; Henk, Martin

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Publication Date: 2014-02-26

Description: Our main result is that every n-dimensional polytope can be described by at most (2n-1) polynomial inequalities and, moreover, these polynomials can explicitly be constructed. For an n-dimensional pointed polyhedral cone we prove the bound 2n-2 and for arbitrary polyhedra we get a constructible representation by 2n polynomial inequalities.

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37

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The final NETLIB-LP results (2003)

Koch, Thorsten

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Publication Date: 2020-02-11

Description: The NETLIB has now served for 18 years as a repository of LP problem instances. From the beginning to the present day there was some uncertainness about the precise values of the optimal solutions. We implemented a program using exact rational arithmetic to compute proofs for the feasibility and optimality of an LP solution. This paper reports the \emph{exact} optimal objective values for all NETLIB problems.

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38

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Dust formation in brown dwarf atmospheres under conditions of driven turbulence (2003)

Helling, Christiane ; Klein, Rupert ; Woitke, Peter ; [et al.]

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Publication Date: 2014-02-26

Description: Based on the knowledge gained from direct numerical simulations which are only possible in the microscale regime, a concept of driven turbulence is presented which allows to enter the mesoscopic scale regime. Here, dust formation under stochastic hydro- and thermodynamic conditions is studied: constructively superimposed stochastic waves initiate dust formation by the creation of singular nucleation events. It, hence, results a varying mean grain size and dust density in space and time. The newly formed dust changes the thermodynamic behavior from almost isotherm to adiabatic and chemically depletes the gas phase.

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39

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Kosten- und Qualitätsoptimierung in Kommunikationsnetzen (2003)

Bley, Andreas ; Koster, Arie M.C.A. ; Kröller, Alexander ; [et al.]

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Publication Date: 2014-11-11

Description: Der scharfe Wettbewerb innerhalb der Telekommunikationsbranche zwingt die Netzbetreiber dazu, ihre Investitionen genau zu planen und immer wieder Einsparungsmanahmen durchzuführen. Gleichzeitig ist es jedoch wichtig, die Qualität der angebotenen Dienste zu verbessern, um neue Kunden zu gewinnen und langfristig an sich zu binden. Die mathematische Optimierung bietet sich für viele solcher Aufgabenstellungen als hervorragend geeignetes Planungswerkzeug an. Ziel dieses Artikels ist es, ihre Methodik und ihre Anwendung speziell zur Kosten- und Qualitätsoptimierung in Kommunikationsnetzen vorzustellen. Anhand von vier konkreten Planungsaufgaben aus dem Bereich der Festnetzplanung wird aufgezeigt, wie sich komplexe Zusammenhänge in flexiblen mathematischen Modellen abbilden lassen und welche Verfahren zur automatisierten Bearbeitung der Probleme eingesetzt werden können. Die hier vorgestellten Methoden zeichnen sich insbesondere dadurch aus, dass sie neben hochwertigen Lösungen auch eine Qualittsgarantie liefern, mit der sich die Lsungen fundiert bewerten lassen. Die dokumentierten Ergebnisse aus verschiedenen Industrieprojekten belegen die Eignung und Güte der mathematischen Optimierung für die Praxis.

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40

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Dust in Brown Dwarfs IV. Dust formation and driven turbulence on mesoscopic scales (2003)

Helling, Christiane ; Klein, Rupert ; Woitke, Peter ; [et al.]

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Publication Date: 2014-02-26

Description: Dust formation {in brown dwarf atmospheres} is studied by utilizing a model for driven turbulence in the mesoscopic scale regime. We apply a pseudo-spectral method where waves are created and superimposed {within} a {limited} wavenumber interval. The turbulent kinetic energy distribution follows the Kolmogoroff spectrum which is assumed to be the most likely value. Such superimposed, stochastic waves may occur in a convectively active environment. They cause nucleation fronts and nucleation events and thereby initiate the dust formation process which { continues until} all condensible material is consumed. Small disturbances {are found to} have a large impact on the dust forming system. An initially dust-hostile region, which may originally be optically thin, becomes optically thick in a patchy way showing considerable variations in the dust properties during the formation process. The dust appears in lanes and curls as a result of the interaction with waves, i.e. turbulence, which form larger and larger structures with time. Aiming on a physical understanding of the variability of brown dwarfs, related to structure formation in substellar atmospheres, we work out first necessary criteria for small-scale closure models to be applied in macroscopic simulations of dust forming astrophysical systems.

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41

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The multi-scale dust formation in substellar atmospheres (2003)

Helling, Christiane ; Klein, Rupert ; Sedlmayr, Erwin

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Publication Date: 2014-02-26

Description: Substellar atmospheres are observed to be irregularly variable for which the formation of dust clouds is the most promising candidate explanation. The atmospheric gas is convectively unstable and, last but not least, colliding convective cells are seen as cause for a turbulent fluid field. Since dust formation depends on the local properties of the fluid, turbulence influences the dust formation process and may even allow the dust formation in an initially dust-hostile gas. A regime-wise investigation of dust forming substellar atmospheric situations reveals that the largest scales are determined by the interplay between gravitational settling and convective replenishment which results in a dust-stratified atmosphere. The regime of small scales is determined by the interaction of turbulent fluctuations. Resulting lane-like and curled dust distributions combine to larger and larger structures. We compile necessary criteria for a subgrid model in the frame of large scale simulations as result of our study on small scale turbulence in dust forming gases.

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42

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HelmPole - A finite element solver for scattering problems on unbounded domains: Implementation based on PML (2003)

Burger, Sven ; Klose, Roland ; Schädle, Achim ; [et al.]

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Publication Date: 2019-01-24

Description: The solution of scattering problems described by the Helmholtz equation on unbounded domains is of importance for a wide variety of applications, for example in electromagnetics and acoustics. An implementation of a solver for scattering problems based on the programming language Matlab is introduced. The solver relies on the finite-element-method and on the perfectly-matched-layer-method, which allows for the simulation of scattering problems on complex geometries surrounded by inhomogeneous exterior domains. This report gives a number of detailed examples and can be understood as a user manual to the freely accessible code of the solver HelmPole.

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43

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Progressive Retrieval and Hierarchical Visualization of Large Remote Data (2003)

Hege, Hans-Christian ; Hutanu, Andrei ; Kähler, Ralf ; [et al.]

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Publication Date: 2020-03-09

Description: \noindent The size of data sets produced on remote supercomputer facilities frequently exceeds the processing capabilities of local visualization workstations. This phenomenon increasingly limits scientists when analyzing results of large-scale scientific simulations. That problem gets even more prominent in scientific collaborations, spanning large virtual organizations, working on common shared sets of data distributed in Grid environments. In the visualization community, this problem is addressed by distributing the visualization pipeline. In particular, early stages of the pipeline are executed on resources closer to the initial (remote) locations of the data sets. \noindent This paper presents an efficient technique for placing the first two stages of the visualization pipeline (data access and data filter) onto remote resources. This is realized by exploiting the ``extended retrieve'' feature of GridFTP for flexible, high performance access to very large HDF5 files. We reduce the number of network transactions for filtering operations by utilizing a server side data processing plugin, and hence reduce latency overhead compared to GridFTP partial file access. The paper further describes the application of hierarchical rendering techniques on remote uniform data sets, which make use of the remote data filtering stage.

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44

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The Potential of Relaying in Cellular Networks (2003)

Geerdes, Hans-Florian ; Karl, Holger

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Publication Date: 2014-02-26

Description: Relaying is a protocol extension for cellular wireless computer networks; in order to utilize radio resources more efficiently, several hops are allowed within one cell. This paper investigates the principle potential of relaying by casting transmission scheduling as a mathematical optimization problem, namely, a linear program. We analyze the throughput gains showing that, irrespective of the concrete scheduling algorithm, performance gains of up to 30\% on average for concrete example networks are achievable.

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45

Unknown

Critical and Anticritical Edges with respect to Perfectness (2003)

Wagler, Annegret

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Publication Date: 2014-02-26

Description: We call an edge $e$ of a perfect graph $G$ critical if $G-e$ is imperfect and call $e$ anticritical if $G+e$ is imperfect. The present paper surveys several questions in this context. We ask in which perfect graphs critical and anticritical edges occur and how to detect such edges. The main result by [{\sl Wagler, PhD thesis 2000}] shows that a graph does not admit any critical edge if and only if it is Meyniel. The goal is to order the edges resp.~non-edges of certain perfect graphs s.t. deleting resp.~adding all edges in this order yields a sequence of perfect graphs only. Results of [{\sl Hayward 1985}] and [{\sl Spinrad & Sritharan 1995}] show the existence of such edge orders for weakly triangulated graphs; the line-perfect graphs are precisely these graphs where all edge orders are perfect [{\sl Wagler 2001}]. Such edge orders cannot exist for every subclass of perfect graphs that contains critically resp.~anticritically perfect graphs where deleting resp.~adding an arbitrary edge yields an imperfect graph. We present several examples and properties of such graphs, discuss constructions and characterizations from [{\sl Wagler 1999, Wagler PhD thesis 2000}]. An application of the concept of critically and anticritically perfect graphs is a result due to [{\sl Hougardy & Wagler 2002}] showing that perfectness is an elusive graph property.

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46

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Accelerating Hasenbusch's Acceleration of Hybrid Monte Carlo (2003)

Khan, Arifa Ali ; Bakeyev, Timur ; Göckeler, Meinulf ; [et al.]

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Publication Date: 2014-02-26

Description: Hasenbusch has proposed splitting the pseudo-fermionic action into two parts, in order to speed-up Hybrid Monte Carlo simulations of QCD. We have tested a different splitting, also using clover-improved Wilson fermions. An additional speed-up between 5 and 20\% over the original proposal was achieved in production runs.

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47

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Safe separators for treewidth (2003)

Bodlaender, Hans L. ; Koster, Arie M.C.A.

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Publication Date: 2014-11-10

Description: A set of vertices $S\subseteq V$ is called a safe separator for treewidth, if $S$ is a separator of $G$, and the treewidth of $G$ equals the maximum of the treewidth over all connected components $W$ of $G-S$ of the graph, obtained by making $S$ a clique in the subgraph of $G$, induced by $W\cup S$. We show that such safe separators are a very powerful tool for preprocessing graphs when we want to compute their treewidth. We give several sufficient conditions for separators to be safe, allowing such separators, if existing, to be found in polynomial time. In particular, every minimal separator of size one or two is safe, every minimal separator of size three that does not split off a component with only one vertex is safe, and every minimal separator that is an almost clique is safe; an almost clique is a set of vertices $W$ such that there is a $v\in W$ with $W-\{v\}$ a clique. We report on experiments that show significant reductions of instance sizes for graphs from proba! bilistic networks and frequency assignment.

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48

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Interior Point Methods in Function Space (2003)

Weiser, Martin

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Publication Date: 2019-01-29

Description: A primal-dual interior point method for optimal control problems is considered. The algorithm is directly applied to the infinite dimensional problem. Existence and convergence of the central path are analyzed, and linear convergence of a short step pathfollowing method is established.

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49

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Triangulated Manifolds with Few Vertices: Geometric 3-Manifolds (2003)

Lutz, Frank H.

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Publication Date: 2014-02-26

Description: We explicitly construct small triangulations for a number of well-known $3$-dimensional manifolds and give a brief outline of some aspects of the underlying theory of $3$-manifolds and its historical development.

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50

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Lastbalancierung in Peer-to-Peer Systemen (2003)

Rieche, Simon

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Publication Date: 2016-06-30

Description: Peer-to-Peer (P2P) Systeme werden u.a. zur Verwaltung von großen Datenmengen benutzt, die auf verschiedene Rechner verteilt sind. Benutzern soll damit der Zugriff auf Daten innerhalb des Systems leicht ermöglicht werden. Damit in P2P Systemen die Daten effizient verteilt und gesucht werden können, existieren Distributed Hash Tables. Distributed Hash Tables (DHT) sind eine Methode, um globale Informationen persistent speichern zu können. Der Wertebereich der Hashfunktion, welche die zu veröffentlichenden Einträge auf Werte abbildet, wird in Abschnitte aufgeteilt, die einzelnen Knoten zugeteilt werden. Die meisten DHTs haben aber ein Problem bei der Verteilung der Last. Die verschiedenen DHT Systeme beruhen meist auf einem identischen Ansatz der Lastverteilung. Die Last wird nur mit Hilfe einer Hashfunktion verteilt. Es wird davon ausgegangen, dass diese Funktion die Last gleichmäßig verteilt. Im Rahmen dieser Arbeit wurde ein Verfahren zur Last Verteilung entwickelt, simuliert und implementiert. Bei dem Verfahren wird die Last wie bei der Verteilung von Wärme an die Umgebung abgegeben. Es wird mit existierenden Lastbalancierungsalgorithmen verglichen. Mit diesem neuen Verfahren ist es möglich, Last in DHTs besser zu verteilen ohne große Änderungen an den DHTs vorzunehmen. Es wird gezeigt, wie mit dem Verfahren zusätzlich die Fehlertoleranz des P2P Systems erhöht werden kann.

Description: One of the many uses of Peer-to-Peer (P2P) systems is the administration of large data sets that are distributed across different computers, with the goal of facilitating user access to files within the system. Distributed Hash Tables (DHT) are designed to enable the efficient distribution and search of files, by allowing global information to be persistently stored. The range of values of the hash function (the possible entries in the published hash table) are assigned to individual nodes. Most DHTs, however, have a problem with load distribution. The various DHT systems usually operate by distributing load equally among nodes. Thus the load is distributed using the help of the hash function. One assumes this function distributes the load evenly. In the context of this work a method of distributing load has been developed, simulated and implemented. With this method load is transferred in a fashion analogous to the dissipation of heat into the environment. Comparisons with existing algorithms for load balancing are drawn. With the new procedure it is possible to better distribute load in DHTs without requiring major changes to the DHTs themselves. It is shown that with the procedure the fault tolerance of P2P systems may also be increased.

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Language: German

Type: masterthesis , doc-type:masterThesis

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51

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Robust Perron Cluster Analysis in Conformation Dynamics (2003)

Deuflhard, Peter ; Weber, Marcus

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Publication Date: 2014-02-26

Description: The key to molecular conformation dynamics is the direct identification of metastable conformations, which are almost invariant sets of molecular dynamical systems. Once some reversible Markov operator has been discretized, a generalized symmetric stochastic matrix arises. This matrix can be treated by Perron cluster analysis, a rather recent method involving a Perron cluster eigenproblem. The paper presents an improved Perron cluster analysis algorithm, which is more robust than earlier suggestions. Numerical examples are included.

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52

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Demand-wise Shared Protection for Meshed Optical Networks (2003)

Koster, Arie M.C.A. ; Zymolka, Adrian ; Jäger, Monika ; [et al.]

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Publication Date: 2014-11-11

Description: In this paper, a new shared protection mechanism for meshed optical networks is presented. Significant network design cost reductions can be achieved in comparison to the well-known 1+1 protection scheme. Demand-wise Shared Protection (DSP) bases on the diversification of demand routings and exploits the network connectivity to restrict the number of backup lightpaths needed to provide the desired level of prorection. Computational experiments approve the benefits of the concept DSP for cost efficient optical network designs.

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53

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Simulation of the Human Mandible: Comparison of Bone Mineral Density and Stress/Strain Profiles due to Masticatory Muscles' Traction (2003)

Kober, Cornelia ; Erdmann, Bodo ; Sader, Robert ; [et al.]

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Publication Date: 2019-05-10

Description: The correlation of the inner architecture of bone and its functional loading was already stated by Wolff in 1892. Our objective is to demonstrate this interdependence in the case of the human mandible. For this purpose, stress/strain profiles occuring at a human lateral bite were simulated. Additionally, by a combination of computer graphics modules, a three--dimensional volumetric visualization of bone mineral density could be given. Qualitative correspondences between the density profile of the jaw and the simulated stress/strain profiles could be pointed out. In the long run, this might enable the use of the simulation for diagnosis and prognosis. The solution of the underlying partial differential equations describing linear elastic material behaviour was provided by an adaptive finite element method. Estimates of the discretization errors, local grid refinement, and multilevel techniques guaranteed the reliability and efficiency of the method.

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54

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MoDySim - A parallel dynamical UMTS simulator (2003)

Fleuren, Maria ; Stüben, Hinnerk ; Zegwaard, Gideon

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Publication Date: 2014-02-26

Description: UMTS is a 3rd generation mobile telecommunication system which enables multi-service and multi-bit rate communication going beyond the possibilities of previous systems. The simulator MoDySim models UMTS in great detail. Characteristics of UMTS such as soft hand-over and the interdependency of load and capacity among neighbouring cells are challenges for the parallelisation of such a system. In this paper we explain how the software was parallelised and present performance results of a UMTS simulation for the city of Berlin.

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55

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A numerical reinvestigation of the Aoki phase with $N_f=2$ Wilson fermions at zero temperature (2003)

Ilgenfritz, Ernst-Michael ; Kerler, Werner ; Müller-Preussker, Michael ; [et al.]

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Publication Date: 2014-02-26

Description: We report on a numerical reinvestigation of the Aoki phase in lattice QCD with two flavors of Wilson fermions where the parity-flavor symmetry is spontaneously broken. For this purpose the Hybrid Monte Carlo algorithm was used and an explicit symmetry-breaking source term $h\bar{\psi} i \gamma_{5} \tau^{3}\psi$ was added to the Wilson fermion action. The order parameter $\langle\bar{\psi}i\gamma_{5}\tau^{3}\psi\rangle$ was studied at several values of $(\beta,\kappa,h)$ on lattices of sizes $4^4$ to $12^4$. Our largest lattices can be considered as infintely large allowing to extrapolate to $h=0$. The existence of a parity-flavor-breaking phase can be confirmed at $\beta=4.0$ and $\beta=4.3$ while we find no sign of parity-flavor-breaking at $\beta=4.6$ and $\beta=5.0$.

Keywords: ddc:000

Language: English

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56

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Clustering by using a simplex structure (2003)

Weber, Marcus

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Publication Date: 2014-02-26

Description: In this paper we interpret clustering as a mapping of data into a simplex. If the data itself has simplicial struture this mapping becomes linear. Spectral analysis is an often used tool for clustering data. We will show that corresponding singular vectors or eigenvectors comprise simplicial structure. Therefore they lead to a cluster algorithm, which consists of a simple linear mapping. An example for this kind of algorithms is the Perron cluster analysis (PCCA). We have applied it in practice to identify metastable sets of molecular dynamical systems. In contrast to other algorithms, this kind of approach provides an a priori criterion to determine the number of clusters. In this paper we extend the ideas to more general problems like clustering of bipartite graphs.

Keywords: ddc:000

Language: English

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Ein neues Verfahren zur Lösung des Streuproblems der Maxwell-Gleichungen (2003)

Farshbaf-Shaker, Mohammad-Hassan

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Publication Date: 2016-06-09

Keywords: ddc:000

Language: German

Type: masterthesis , doc-type:masterThesis

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58

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Jahresbericht 2002 (2003)

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Publication Date: 2019-10-24

Keywords: ddc:000

Language: German

Type: annualzib , doc-type:report

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59

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Semantic Annotation in Mathematics and Math-Net (2003)

Dalitz, Wolfgang ; Neun, Winfried ; Sperber, Wolfram

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Publication Date: 2022-04-11

Description: The Web of the future will provide a huge amount of information. We need better ways for dealing with and managing the information. A qualified semantic annotation of the information plays a key role for the Web of the future. This article gives an overview about the efforts of the mathematical community to build up a distributed and open information and communication system for mathematics: the Math-Net. The Math-Net Initiative has developed metadata schemas for some classes of Web resources which are relevant in mathematics. Math-Net Services process this information and enable the user to efficiently search and access the information.

Keywords: ddc:000

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60

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A new Finite Element realization of the Perfectly Matched Layer Method for Helmholtz scattering problems on polygonal domains in 2D (2003)

Zschiedrich, Lin ; Klose, Roland ; Schädle, Achim ; [et al.]

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Publication Date: 2022-07-07

Description: In this paper we propose a new finite element realization of the Perfectly Matched Layer method (PML-method). Our approach allows to deal with arbitrary shaped polygonal domains and with certain types of inhomogeneous exterior domains. Among the covered inhomogeneities are open waveguide structures playing an essential role in integrated optics. We give a detailed insight to implementation aspects. Numerical examples show exponential convergence behavior to the exact solution with the thickness of the PML sponge layer.

Keywords: ddc:000

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Variations of the histochemically demonstrable protein-bound sulfhydryl and disulfide groups in cells of the anterior pituitary gland under various endocrine conditionsThis study was supported in part by a grant from the National Institute of Arthritis and Metabolic Diseases (A-452), National Institutes of Health, Department of Health, Education and Welfare, and, in part, by an Institutional Grant to Harvard University from the American Cancer Society. (1956)

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The electron microscopy of the lamprey spinal cordThis work was supported by grants to one of us (D. C. P.) from the United States Public Health Service. (1956)

Schultz, Robert ; Berkowitz, Ellis C. ; Pease, Daniel C.

New York, NY : Wiley-Blackwell

Journal of Morphology 98 (1956), S. 251-273

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ISSN: 0362-2525

Keywords: Life and Medical Sciences ; Cell & Developmental Biology

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Biology , Medicine

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1002/jmor.1050980204

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62

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Ladman, Aaron J. ; Barrnett, Russell J.

New York, NY : Wiley-Blackwell

Journal of Morphology 98 (1956), S. 305-333

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ISSN: 0362-2525

Keywords: Life and Medical Sciences ; Cell & Developmental Biology

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Biology , Medicine

Additional Material: 23 Ill.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1002/jmor.1050980206

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63

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The anatomy and development of the buccal glands of the lake lamprey (Petromyzon marinus Linnaeus) and the histochemistry of their secretionFrom a thesis submitted to the faculty of the Graduate School of Cornell University in partial fulfillment of the requirements for the degree of Master of Science. (1956)

Gibbs, Sarah Preble

New York, NY : Wiley-Blackwell

Journal of Morphology 98 (1956), S. 429-469

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ISSN: 0362-2525

Keywords: Life and Medical Sciences ; Cell & Developmental Biology

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Biology , Medicine

Additional Material: 10 Ill.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1002/jmor.1050980305

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64

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The inductive activity of the spinal cord in urodele tail regenerationSubmitted to the Department of Zoology of the University of Chicago in partial fulfillment for the degree of Doctor of Philosophy.This investigation was supported in part by a research grant no. B 493 from the National Institute of Neurological Diseases and Blindness of the National Institutes of Health, Public Health Service. (1956)

Holtzer, Sybil W.

New York, NY : Wiley-Blackwell

Journal of Morphology 99 (1956), S. 1-39

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ISSN: 0362-2525

Keywords: Life and Medical Sciences ; Cell & Developmental Biology

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Biology , Medicine

Additional Material: 7 Ill.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1002/jmor.1050990102

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A study of meiosis in coelomic and oviducal oocytes of Triturus viridescens, with particular emphasis on the origin of spontaneous polyploidy and the effects of heat shock on the first meiotic divisionPart of a dissertation presented to the faculty of Princeton University in candidacy for the degree of Doctor Of Philosophy. (1956)

Humphries, A. A.

New York, NY : Wiley-Blackwell

Journal of Morphology 99 (1956), S. 97-135

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ISSN: 0362-2525

Keywords: Life and Medical Sciences ; Cell & Developmental Biology

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Biology , Medicine

Additional Material: 3 Ill.

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URL: http://dx.doi.org/10.1002/jmor.1050990106

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Histological and histochemical observations on the parotid, submaxillary and sublingual glands of the tropical American fruit bat Artibeus jamaicensis LeachThe author wishes to acknowledge his indebtedness to Dr. Harold Trapido of the Gorgas Memorial Laboratory in Panama who made available the Artibeus specimens and tissues upon which this report is based, and to Dr. Herbert C. Clark, former director of the Gorgas Laboratory for bearing the expense of the collection of the material. (1956)

Wimsatt, William A.

New York, NY : Wiley-Blackwell

Journal of Morphology 99 (1956), S. 169-209

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ISSN: 0362-2525

Keywords: Life and Medical Sciences ; Cell & Developmental Biology

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Biology , Medicine

Additional Material: 1 Tab.

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URL: http://dx.doi.org/10.1002/jmor.1050990108

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67

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The structure of the skull of the beaked whale, Mesoplodon gervaisi Deslongchamps (1956)

Rankin, Jessie J.

New York, NY : Wiley-Blackwell

Journal of Morphology 99 (1956), S. 329-357

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ISSN: 0362-2525

Keywords: Life and Medical Sciences ; Cell & Developmental Biology

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Biology , Medicine

Additional Material: 9 Ill.

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URL: http://dx.doi.org/10.1002/jmor.1050990205

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68

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The origin and distribution of periodic acid-Schiff-positive substances in the oocyte of the earwig, Anisolabis maritima (Géné) (1956)

Bonhag, Philip F.

New York, NY : Wiley-Blackwell

Journal of Morphology 99 (1956), S. 433-463

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ISSN: 0362-2525

Keywords: Life and Medical Sciences ; Cell & Developmental Biology

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Biology , Medicine

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1002/jmor.1050990302

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69

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Morphology and seasonal development of sex characters in two sympatric African toads (1956)

Inger, Robert F. ; Greenberg, Bernard

New York, NY : Wiley-Blackwell

Journal of Morphology 99 (1956), S. 549-574

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ISSN: 0362-2525

Keywords: Life and Medical Sciences ; Cell & Developmental Biology

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Biology , Medicine

Additional Material: 11 Ill.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1002/jmor.1050990306

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The relation of bone to the histogenesis of cartilage in regenerating forelimbs and tails of adult Triturus viridescensThis research has been supported in part by an institutional grant to Brown University from the American Cancer Society. (1956)

Goss, Richard J.

New York, NY : Wiley-Blackwell

Journal of Morphology 98 (1956), S. 89-123

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ISSN: 0362-2525

Keywords: Life and Medical Sciences ; Cell & Developmental Biology

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Biology , Medicine

Additional Material: 3 Ill.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1002/jmor.1050980104

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Developmental analysis of a mutation with pleiotropic effects in the mouseSubmitted in partial fulfillment of the requirements for the degree of Doctor of Philosophy in the Faculty of Pure Science of Columbia University.This work was supported in part by a research grant (G 3676) from the National Institute of Health, Public Health Service. (1956)

Bennett, Dorothea

New York, NY : Wiley-Blackwell

Journal of Morphology 98 (1956), S. 199-233

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ISSN: 0362-2525

Keywords: Life and Medical Sciences ; Cell & Developmental Biology

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Biology , Medicine

Additional Material: 2 Ill.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1002/jmor.1050980202

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72

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New York, NY : Wiley-Blackwell

Journal of Morphology 98 (1956)

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ISSN: 0362-2525

Keywords: Life and Medical Sciences ; Cell & Developmental Biology

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Biology , Medicine

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1002/jmor.1050980301

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The growth and morphology of Amblystoma chimerasA revision of a dissertation submitted in partial fulfillment of the requirements for the degree of doctor of Philosophy in Stanford University. A preliminary report of this work has already been published (Church, '53). (1956)

Church, Gilbert

New York, NY : Wiley-Blackwell

Journal of Morphology 98 (1956), S. 405-428

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ISSN: 0362-2525

Keywords: Life and Medical Sciences ; Cell & Developmental Biology

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Biology , Medicine

Additional Material: 5 Ill.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1002/jmor.1050980304

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The cytophysiology of the spiracular glands of Drosophila melanogasterThis study is respectfully dedicated to the distinguished Zoologist, Professor Alexander Petrunkevitch, on the occasion of his eightieth birthday, December 22, 1955. (1956)

Rizki, M. T. M.

New York, NY : Wiley-Blackwell

Journal of Morphology 98 (1956), S. 497-511

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ISSN: 0362-2525

Keywords: Life and Medical Sciences ; Cell & Developmental Biology

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Biology , Medicine

Additional Material: 14 Ill.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1002/jmor.1050980307

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Adaptations during gestation in the viviparous cyprinodont teleost, Hubbsina turneriThis study is a part of a more extensive project supported by Grant No. NSFG905 of the National Science Foundation and a grant from Grinnell College. (1956)

Mendoza, Guillermo

New York, NY : Wiley-Blackwell

Journal of Morphology 99 (1956), S. 73-95

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ISSN: 0362-2525

Keywords: Life and Medical Sciences ; Cell & Developmental Biology

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Biology , Medicine

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1002/jmor.1050990105

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76

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The expansor secundariorum muscle, with special reference to passerine birds (1956)

Berger, Andrew J.

New York, NY : Wiley-Blackwell

Journal of Morphology 99 (1956), S. 137-167

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ISSN: 0362-2525

Keywords: Life and Medical Sciences ; Cell & Developmental Biology

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Biology , Medicine

Additional Material: 3 Ill.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1002/jmor.1050990107

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77

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Nuclear content of DNA in chromosomal polymorphism in the genus Ameles (Orthoptera: Mantoidea) (1956)

Wahrman, J. ; O'Brien, Regina

New York, NY : Wiley-Blackwell

Journal of Morphology 99 (1956), S. 259-270

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ISSN: 0362-2525

Keywords: Life and Medical Sciences ; Cell & Developmental Biology

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Biology , Medicine

Additional Material: 7 Ill.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1002/jmor.1050990203

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Volumetric and cytologic variation in the pineal body of Peromyscus leucopus (rodentia) with respect to sex, captivity and day-lengthFinancial support for publication was provided by funds derived from income on the endowment of the Horace H. Rackham School of Graduate Studies, University of Michigan. (1956)

New York, NY : Wiley-Blackwell

Journal of Morphology 99 (1956)

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ISSN: 0362-2525

Keywords: Life and Medical Sciences ; Cell & Developmental Biology

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Biology , Medicine

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1002/jmor.1050990301

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79

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Quay, W. B.

New York, NY : Wiley-Blackwell

Journal of Morphology 98 (1956), S. 471-495

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ISSN: 0362-2525

Keywords: Life and Medical Sciences ; Cell & Developmental Biology

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Biology , Medicine

Additional Material: 5 Tab.

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URL: http://dx.doi.org/10.1002/jmor.1050980306

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A cytochemical study of hemipteran spermatogenesisSubmitted in partial fulfillment of the requirements for the degree of Doctor of Philosophy in the Faculty of Pure Science of Columbia University. (1956)

Moriber, Louis G.

New York, NY : Wiley-Blackwell

Journal of Morphology 99 (1956), S. 271-327

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ISSN: 0362-2525

Keywords: Life and Medical Sciences ; Cell & Developmental Biology

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Biology , Medicine

Additional Material: 2 Ill.

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URL: http://dx.doi.org/10.1002/jmor.1050990204

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A study of some cytochemical reactions and of the hormone content of the adenohypophysis in normal and in genetic dwarf miceBased in part on material from a thesis submitted to the Department of Zoology in partial satisfaction of the requirements for the degree of Doctor of Philosophy. (1956)

Ortman, Robert

New York, NY : Wiley-Blackwell

Journal of Morphology 99 (1956), S. 417-431

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ISSN: 0362-2525

Keywords: Life and Medical Sciences ; Cell & Developmental Biology

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Biology , Medicine

Additional Material: 2 Ill.

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URL: http://dx.doi.org/10.1002/jmor.1050990207

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Structure and histochemistry of the maxillary glands in the milkweed bug, Oncopeltus Fasciatus (Hem.)A revision of a thesis submitted to the faculty of Cornell University in partial fulfillment of the requirements for the degree of Master of Science. (1956)

Linder, Harris J.

New York, NY : Wiley-Blackwell

Journal of Morphology 99 (1956), S. 575-611

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ISSN: 0362-2525

Keywords: Life and Medical Sciences ; Cell & Developmental Biology

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Biology , Medicine

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1002/jmor.1050990307

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Pigmentation in a white-haired region of the hooded rat as a result of cell transplantationMost of the work reported in this paper was carried out in the Biology Department of the Johns Hopkins University, Baltimore, while the author was working there as a research-fellow-by-courtesy, and was receiving a Smith-Mundt grant i.e. a U. S. Government Educational award. The work was completed at Birmingham University, England. (1956)

New York, NY : Wiley-Blackwell

Journal of Morphology 98 (1956)

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ISSN: 0362-2525

Keywords: Life and Medical Sciences ; Cell & Developmental Biology

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Biology , Medicine

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1002/jmor.1050980101

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84

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Morphology of the accessory air-breathing organs of the teleost, Clarias lazera (C. and V.) (1956)

Moussa, Tohamy A.

New York, NY : Wiley-Blackwell

Journal of Morphology 98 (1956), S. 125-160

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ISSN: 0362-2525

Keywords: Life and Medical Sciences ; Cell & Developmental Biology

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Biology , Medicine

Additional Material: 17 Ill.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1002/jmor.1050980105

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Histochemical localization of alkaline phosphatase, glycogen and nucleic acids in the female reproductive organs of the cockroach, Periplaneta Americana (1956)

Kugler, Otto E. ; Frankenstein, Paul W. ; Rafferty, Keen A.

New York, NY : Wiley-Blackwell

Journal of Morphology 98 (1956), S. 235-249

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ISSN: 0362-2525

Keywords: Life and Medical Sciences ; Cell & Developmental Biology

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Biology , Medicine

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1002/jmor.1050980203

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86

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The coral snake mimic problem: A reinterpretation (1956)

Hecht, Max K. ; Marien, Daniel

New York, NY : Wiley-Blackwell

Journal of Morphology 98 (1956), S. 335-365

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ISSN: 0362-2525

Keywords: Life and Medical Sciences ; Cell & Developmental Biology

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Biology , Medicine

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1002/jmor.1050980207

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Pepper, Florence Jean

New York, NY : Wiley-Blackwell

Journal of Morphology 98 (1956), S. 367-387

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ISSN: 0362-2525

Keywords: Life and Medical Sciences ; Cell & Developmental Biology

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Biology , Medicine

Additional Material: 1 Tab.

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URL: http://dx.doi.org/10.1002/jmor.1050980302

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Certain cytochemical and cytological aspects of dwarfism in cattle (1956)

Leuchtenberger, Cecilie ; Schrader, Franz ; Hughes-Schrader, Sally ; [et al.]

New York, NY : Wiley-Blackwell

Journal of Morphology 99 (1956), S. 481-512

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ISSN: 0362-2525

Keywords: Life and Medical Sciences ; Cell & Developmental Biology

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Biology , Medicine

Additional Material: 14 Ill.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1002/jmor.1050990304

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The development of the knee joint of the chick and its corelation with embryonic stagingAided by a grant from the Michigan Chapter of the Arthritis and Rheumatism Foundation. (1956)

O'Rahilly, Ronan ; Gardner, Ernest

New York, NY : Wiley-Blackwell

Journal of Morphology 98 (1956), S. 49-87

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ISSN: 0362-2525

Keywords: Life and Medical Sciences ; Cell & Developmental Biology

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Biology , Medicine

Additional Material: 3 Ill.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1002/jmor.1050980103

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90

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Structure and functional capacity of the ovaries of higher polyploids (4N, 5N) in the Mexican axolotl (Siredon or Ambystoma mexicanum)This work was supported in part from 1947 to 1950 by a grant from the Rockefeller Foundation to Princeton University, and has been aided since 1950 by grants from the American Cancer Society to Princeton University Administered through the Committee on Growth of the National Research Council, and by the Eugene Higgins Fund of Princeton University. (1956)

Humphrey, R. R. ; Fankhauser, G.

New York, NY : Wiley-Blackwell

Journal of Morphology 98 (1956), S. 161-197

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ISSN: 0362-2525

Keywords: Life and Medical Sciences ; Cell & Developmental Biology

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Biology , Medicine

Additional Material: 1 Tab.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1002/jmor.1050980106

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Effects of vitamin A deficiency on skin and hair growth in miceFrom a thesis submitted in partial fulfillment of the requirements for the degree of Doctor of Philosophy at Brown University, Providence, Rhode Island. (1956)

Loewenthal, Lois A.

New York, NY : Wiley-Blackwell

Journal of Morphology 98 (1956), S. 275-303

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ISSN: 0362-2525

Keywords: Life and Medical Sciences ; Cell & Developmental Biology

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Biology , Medicine

Additional Material: 1 Tab.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1002/jmor.1050980205

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The effects of implanting anuran cancer into regenerating adult urodele limbs. I. Simple regenerating systems (1956)

Ruben, Laurens N.

New York, NY : Wiley-Blackwell

Journal of Morphology 98 (1956), S. 389-403

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Details

ISSN: 0362-2525

Keywords: Life and Medical Sciences ; Cell & Developmental Biology

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Biology , Medicine

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1002/jmor.1050980303

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Library	Location	Call Number	Volume/Issue/Year	Availability

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Paper (German National Licenses)

Fulltext

93

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