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2

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Fault-Tolerant and Decentralized Lease Coordination in Distributed Systems (2010)

Kolbeck, Björn ; Högqvist, Mikael ; Stender, Jan ; [et al.]

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Publication Date: 2016-06-30

Description: Applications which need exclusive access to a shared resource in distributed systems require a fault-tolerant and scalable mechanism to coordinate this exclusive access. Examples of such applications include distributed file systems and master/slave data replication. We present Flease, an algorithm for decentralized and fault-tolerant lease coordination in distributed systems. Our algorithm allows the processes competing for a resource to coordinate exclusive access through leases among themselves without a central component. The resulting system easily scales with an increasing number of nodes and resources. We prove that Flease ensures exclusive access, i.e. guarantees that there is at most one valid lease at any time.

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3

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Robust Tail Assignment (2010)

Borndörfer, Ralf ; Dovica, Ivan ; Nowak, Ivo ; [et al.]

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Publication Date: 2020-08-05

Description: We propose an efficient column generation method to minimize the probability of delay propagations along aircraft rotations. In this way, delay resistant schedules can be constructed. Computational results for large-scale real-world problems demonstrate substantial punctuality improvements. The method can be generalized to crew and integrated scheduling problems.

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4

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State Trajectory Compression for Optimal Control with Parabolic PDEs (2010)

Weiser, Martin ; Götschel, Sebastian

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Publication Date: 2022-01-07

Description: In optimal control problems with nonlinear time-dependent 3D PDEs, full 4D discretizations are usually prohibitive due to the storage requirement. For this reason gradient and quasi-Newton methods working on the reduced functional are often employed. The computation of the reduced gradient requires one solve of the state equation forward in time, and one backward solve of the adjoint equation. The state enters into the adjoint equation, again requiring the storage of a full 4D data set. We propose a lossy compression algorithm using an inexact but cheap predictor for the state data, with additional entropy coding of prediction errors. As the data is used inside a discretized, iterative algorithm, lossy coding maintaining an error bound is sufficient.

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5

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A simple mathematical model of the bovine estrous cycle: follicle development and endocrine interactions (2010)

Boer, H. Marike T. ; Stötzel, Claudia ; Röblitz, Susanna ; [et al.]

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Publication Date: 2020-03-11

Description: Bovine fertility is the subject of extensive research in animal sciences, especially because fertility of dairy cows has declined during the last decades. The regulation of estrus is controlled by the complex interplay of various organs and hormones. Mathematical modeling of the bovine estrous cycle could help in understanding the dynamics of this complex biological system. In this paper we present a mathematical model of the bovine estrous cycle that includes the processes of follicle and corpus luteum development and the key hormones that interact to control these processes. Focus in this paper is on development of the model, but also some simulation results are presented, showing that a set of equations and parameters is obtained that describes the system consistent with empirical knowledge. Even though the majority of the mechanisms that are included are only known qualitatively as stimulatory or inhibitory effects, the model surprisingly well features quantitative observations made in reality. This model of the bovine estrous cycle could be used as a basis for more elaborate models with the ability to study effects of external manipulations and genetic differences.

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6

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Rapid Learning for Binary Programs (2010)

Berthold, Timo ; Feydy, Thibaut ; Stuckey, Peter

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Publication Date: 2022-03-14

Description: Learning during search allows solvers for discrete optimization problems to remember parts of the search that they have already performed and avoid revisiting redundant parts. Learning approaches pioneered by the SAT and CP communities have been successfully incorporated into the SCIP constraint integer programming platform. In this paper we show that performing a heuristic constraint programming search during root node processing of a binary program can rapidly learn useful nogoods, bound changes, primal solutions, and branching statistics that improve the remaining IP search.

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7

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Models for Line Planning with Transfers (2010)

Borndörfer, Ralf ; Neumann, Marika

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Publication Date: 2020-08-05

Description: We propose a novel integer programming approach to transfer minimization for line planning problems in public transit. The idea is to incorporate penalties for transfers that are induced by “connection capacities” into the construction of the passenger paths. We show that such penalties can be dealt with by a combination of shortest and constrained shortest path algorithms such that the pricing problem for passenger paths can be solved efficiently. Connection capacity penalties (under)estimate the true transfer times. This error is, however, not a problem in practice. We show in a computational comparison with two standard models on a real-world scenario that our approach can be used to minimize passenger travel and transfer times for large-scale line planning problems with accurate results.

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8

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Adaptive Timestep Control for the Contact-Stabilized Newmark Method (2010)

Klapproth, Corinna ; Schiela, Anton ; Deuflhard, Peter

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Publication Date: 2016-06-09

Description: The aim of this paper is to devise an adaptive timestep control in the contact--stabilized Newmark method (CONTACX) for dynamical contact problems between two viscoelastic bodies in the framework of Signorini's condition. In order to construct a comparative scheme of higher order accuracy, we extend extrapolation techniques. This approach demands a subtle theoretical investigation of an asymptotic error expansion of the contact--stabilized Newmark scheme. On the basis of theoretical insight and numerical observations, we suggest an error estimator and a timestep selection which also cover the presence of contact. Finally, we give a numerical example.

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9

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Railway capacity auctions with dual prices (2010)

Schlechte, Thomas ; Tanner, Andreas

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Publication Date: 2020-08-05

Description: Railway scheduling is based on the principle of the construction of a conflict-free timetable. This leads to a strict definition of capacity: in contrast with road transportation, it can be said in advance whether a given railway infrastructure can accommodate - at least in theory - a certain set of train requests. Consequently, auctions for railway capacity are modeled as auctions of discrete goods -- the train slots. We present estimates for the efficiency gain that may be generated by slot auctioning in comparison with list price allocation. We introduce a new class of allocation and auction problems, the feasible assignment problem, that is a proper generalization of the well-known combinatorial auction problem. The feasible assignment class was designed to cover the needs for an auction mechanism for railway slot auctions, but is of interest in its own right. As a practical instance to state and solve the railway slot allocation problem, we present an integer programming formulation, briefly the ACP, which turns out to be an instance of the feasible assignment problem and whose dual problem yields prices that can be applied to define a useful activity rule for the linearized version of the Ausubel Milgrom Proxy auction. We perform a simulation aiming to measure the impact on efficiency and convergence rate.

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10

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Solving Optimal Control Problems with the Kaskade 7 Finite Element Toolbox (2010)

Götschel, Sebastian ; Weiser, Martin ; Schiela, Anton

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Publication Date: 2022-01-07

Description: This paper presents concepts and implementation of the finite element toolbox Kaskade 7, a flexible C++ code for solving elliptic and parabolic PDE systems. Issues such as problem formulation, assembly and adaptivity are discussed at the example of optimal control problems. Trajectory compression for parabolic optimization problems is considered as a case study.

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11

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Aggregation Methods for Railway Networks (2010)

Borndörfer, Ralf ; Erol, Berkan ; Graffagnino, Thomas ; [et al.]

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Publication Date: 2020-08-05

Description: In this paper a bottom-up approach of automatic simplification of a railway network is presented. Starting from a very detailed, microscopic level, as it is used in railway simulation, the network is transformed by an algorithm to a less detailed level (macroscopic network), that is sufficient for long-term planning and optimization. In addition running and headway times are rounded to a pre-chosen time discretization by a special cumulative method, which we will present and analyse in this paper. After the transformation we fill the network with given train requests to compute an optimal slot allocation. Then the optimized schedule is re-transformed into the microscopic level and can be simulated without any conflicts occuring between the slots. The algorithm is used to transform the network of the very dense Simplon corridor between Swiss and Italy. With our aggregation it is possible for the first time to generate a profit maximal and conflict free timetable for the corridor across a day by a simultaneously optimization run.

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12

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Merging solutions of non-linear algebraic systems (2010)

Wolf, Thomas

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Publication Date: 2020-12-11

Description: In solving large polynomial algebraic systems that are too big for standard Gröbner basis techniques one way to make progress is to introduce case distinctions. This divide and conquer technique can be beneficial if the algorithms and computer programs know how to take advantage of inequalities. A further hurdle is the form of the resulting general solutions which often have unnecessarily many branches. In this paper we discuss a procedure to merge solutions by dropping inequalities which are associated with them and, if necessary, by re-parametrizing solutions. In the appendix the usefulness of the procedure is demonstrated in the classification of quadratic Hamiltonians with a Lie-Poisson bracket $e(3)$. This application required the solution of algebraic systems with over 200 unknowns, 450 equations and between 5000 and 9000 terms.

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13

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A Dynamical Systems Approach for Static Evaluation in Go (2010)

Wolf, Thomas

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Publication Date: 2020-12-11

Description: In the paper arguments are given why the concept of static evaluation (SE) has the potential to be a useful extension to Monte Carlo tree search. A new concept of modeling SE through a dynamical system is introduced and strengths and weaknesses are discussed. The general suitability of this approach is demonstrated. A Remark: Among users of the Internet Go server KGS the abbreviation SE is used for 'Score Estimator'. Although different from 'Static Evaluation' a score estimator is easily obtained from static evaluation by adding up probabilities of chains to be alive at the end of the game or points to be owned by White or Black

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14

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Classification of integrable quadratic Hamiltonians on e(3) (2010)

Wolf, Thomas ; Efimovskaya, Olya V.

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Publication Date: 2020-12-11

Description: Linear Poisson brackets on e(3) typical of rigid body dynamics are considered. All quadratic Hamiltonians of Kowalevski type having additional first integral of fourth degree are found. Quantum analogs of these Hamiltonians are listed.

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15

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Classification of integrable super-systems using the SsTools environment (2010)

Kiselev, A. V. ; Wolf, Thomas

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Publication Date: 2020-12-11

Description: A classification problem is proposed for supersymmetric %scaling\/-\/in\-va\-ri\-ant evolutionary PDE that satisfy the assumptions of nonlinearity, nondegeneracy, and homogeneity. Four classes of nonlinear coupled boson\/-\/fermion systems are discovered under the weighting assumption $|f|=|b|=|D_t|=\oh$. The syntax of the \Reduce\ package \SsTools, which was used for intermediate computations, and the applicability of its procedures to the calculus of super\/-\/PDE are described.

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16

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N=2 supersymmetric a=4-KdV hierarchy derived via Gardner's deformation of Kaup-Boussinesq equation (2010)

Hussin, V. ; Kiselev, A. V. ; Krutov, A.O. ; [et al.]

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Publication Date: 2020-12-11

Description: We consider the problem of constructing Gardner's deformations for the $N{=}2$ supersymmetric $a{=}4$--\/Korteweg\/--\/de Vries equation; such deformations yield recurrence relations between the super\/-\/Hamiltonians of the hierarchy. We prove the non\/-\/existence %P.~Mathieu's Open problem on constructing for of supersymmetry\/-\/invariant %Gardner's deformations that %solutions, retract to Gardner's formulas for the KdV equation %whenever it is assumed that, under the %respective component reduction. % in the $N{=}2$ super\/-\/field. the solutions . At the same time, we propose a two\/-\/step scheme for the recursive production of the integrals of motion for the $N{=}2$,\ $a{=}4$--\/SKdV. First, we find a new Gardner's deformation of the Kaup\/--\/Boussinesq equation, which is contained in the bosonic limit of the super\/-\/%$N{=}2$,\ $a{=}4$--\/SKdV hierarchy. This yields the recurrence relation between the Hamiltonians of the limit, whence we determine the bosonic super\/- /Hamiltonians of the full $N{=}2$, $a{=}4$--\/SKdV hierarchy.

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17

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The Quickest Path to the Goal (2010)

Borndörfer, Ralf ; Grötschel, Martin ; Löbel, Andreas

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Publication Date: 2020-08-05

Description: We provide an introduction into the mathematics of and with paths. Not on the shortest, but hopefully on an entertaining path!

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18

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Linienoptimierung - reif für die Praxis? (2010)

Borndörfer, Ralf ; Neumann, Marika

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Publication Date: 2020-08-05

Description: Wir stellen in dieser Arbeit ein mathematisches Optimierungsmodell zur Bestimmung eines optimalen Linienplans vor, das sowohl die Fahrzeiten und die Anzahl der Umstiege berücksichtigt als auch die Kosten des Liniennetzes. Dieses Modell deckt wichtige praktische Anforderungen ab, die in einem gemeinsamen Projekt mit den Verkehrsbetrieben in Potsdam (ViP) formuliert wurden. In diesem Projekt wurde der Linienplan 2010 für Potsdam entwickelt. Unsere Berechnungen zeigen, dass die mathematische Optimierung in nichts einer "Handplanung" des Liniennetzes nachsteht. Im Gegenteil, mit Hilfe des Optimierungsprogramms ist es möglich, durch Veränderung der Parameter mehrere verschiedene Szenarien zu berechnen, miteinander zu vergleichen und Aussagen über minimale Kosten und Fahrzeiten zu machen.

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Language: German

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19

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Positions in the Game of Go as Complex Systems (2010)

Wolf, Thomas

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Publication Date: 2020-12-11

Description: The paper gathers evidence showing different dimensions of the game of Go: the continuous and discrete nature of the game and different types of relations between state variables happening on ultra local, local, regional, and global scales. Based on these observations a new continuous local model for describing a board position is introduced. This includes the identification of the basic variables describing a board position and the formulation and solution of a dynamical system for their computation. To be usable as a static evaluation function for a game playing program at least group-wide (regional)aspects will have to be incorporated.

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20

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Railway Track Allocation by Rapid Branching (2010)

Borndörfer, Ralf ; Schlechte, Thomas ; Weider, Steffen

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Publication Date: 2020-08-05

Description: The track allocation problem, also known as train routing problem or train timetabling problem, is to find a conflict-free set of train routes of maximum value in a railway network. Although it can be modeled as a standard path packing problem, instances of sizes relevant for real-world railway applications could not be solved up to now. We propose a rapid branching column generation approach that integrates the solution of the LP relaxation of a path coupling formulation of the problem with a special rounding heuristic. The approach is based on and exploits special properties of the bundle method for the approximate solution of convex piecewise linear functions. Computational results for difficult instances of the benchmark library TTPLIB are reported.

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21

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Optimizing the Simplon Railway Corridor (2010)

Borndörfer, Ralf ; Erol, Berkan ; Graffagnino, Thomas ; [et al.]

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Publication Date: 2020-08-05

Description: This paper presents a case study on a railway timetable optimization for the very dense Simplon corridor, a major railway connection in the Alps between Switzerland and Italy. Starting from a detailed microscopic network as it is used in railway simulation, the data is transformed by an automatic procedure to a less detailed macroscopic network, that is sufficient for the purpose of capacity planning and amenable to state-of-the-art integer programming optimization methods. In this way, the macroscopic railway network is saturated with trains. Finally, the corresponding timetable is re-transformed to the microscopic level in such a way that it can be operated without any conflicts among the slots. Using this integer programming based micro-macro aggregation-disaggregation approach, it becomes for the first time possible to generate a profit maximal and conflict free timetable for the complete Simplon corridor over an entire day by a simultaneous optimization of all trains requests. This also allows to to undertake a sensitivity analysis of various problem parameters.

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22

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Analysis of a multi-scale asymptotic model for internal gravity waves in a moist atmosphere (2010)

Ruprecht, Daniel

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Publication Date: 2016-06-09

Description: The thesis presents the analysis of a reduced model for modulation of internal gravity waves by deep convective clouds. The starting point for the derivation are conservation laws for mass, momentum and energy coupled with a bulk micro-physics model describing the evolution of mixing ratios of water vapor, cloud water and rain water. A reduced model for the identified scales of the regime is derived, using multi-scale asymptotics. The closure of the model employs conditional averaging over the horizontal scale of the convective clouds. The resulting reduced model is an extension of the anelastic equations, linearized around a constant background state, which are well-known from meteorology. The closure of the model is achieved purely by analytical means and involves no additional physically motivated assumptions. The essential new parameter arising from the coupling to a micro-physics model is the area fraction of saturated regions on the horizontal scale of the convective clouds. It turns out that this parameter is constant on the employed short timescale. Hence the clouds constitute a constant background, modulating the characteristics of propagation of internal waves. The model is then investigated by analytical as well as numerical means. Important results are, among others, that in the model moisture (i) inhibits propagation of internal waves by reducing the modulus of the group velocity, (ii) reduces the angle between the propagation direction of a wave-packet and the horizontal, (iii) causes critical layers and (iv) introduces a maximum horizontal wavelength beyond which waves are no longer propagating but become evanescent. The investigated examples of orographically generated gravity waves also feature a significant reduction of vertical momentum flux by moisture. The model is extended by assuming systematically small under-saturation, that is saturation at leading order. The closure is similar to the original case but requires additional assumptions. The saturated area fraction in the obtained model is no longer constant but now depends nonlinearly on vertical displacement and thus on vertical velocity.

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Type: doctoralthesis , doc-type:doctoralThesis

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23

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A Constraint Integer Programming Approach for Resource-Constrained Project Scheduling (2010)

Berthold, Timo ; Heinz, Stefan ; Lübbecke, Marco ; [et al.]

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Publication Date: 2022-03-14

Description: We propose a hybrid approach for solving the resource-constrained project scheduling problem which is an extremely hard to solve combinatorial optimization problem of practical relevance. Jobs have to be scheduled on (renewable) resources subject to precedence constraints such that the resource capacities are never exceeded and the latest completion time of all jobs is minimized. The problem has challenged researchers from different communities, such as integer programming (IP), constraint programming (CP), and satisfiability testing (SAT). Still, there are instances with 60 jobs which have not been solved for many years. The currently best known approach, lazyFD, is a hybrid between CP and SAT techniques. In this paper we propose an even stronger hybridization by integrating all the three areas, IP, CP, and SAT, into a single branch-and-bound scheme. We show that lower bounds from the linear relaxation of the IP formulation and conflict analysis are key ingredients for pruning the search tree. First computational experiments show very promising results. For five instances of the well-known PSPLIB we report an improvement of lower bounds. Our implementation is generic, thus it can be potentially applied to similar problems as well.

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24

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Coupling Meshbased and Meshfree Methods by a Transfer Operator Approach (2010)

Fackeldey, Konstantin

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Publication Date: 2023-11-03

Description: In contrast to the well known meshbased methods like the finite element method, meshfree methods do not rely on a mesh. However besides their great applicability, meshfree methods are rather time consuming. Thus, it seems favorable to combine both methods, by using meshfree methods only in a small part of the domain, where a mesh is disadvantageous, and a meshbased method for the rest of the domain. We motivate, that this coupling between the two simulation techniques can be considered as saddle point problem and show the stability of this coupling. Thereby a novel transfer operator is introduced, which interacts in the transition zone, where both methods coexist.

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25

Electronic Resource

Darstellung von duktilem Tantal durch thermische Dissoziation von TaCl5 (1934)

Burgers, W. G. ; Basart, J. C. M.

Weinheim : Wiley-Blackwell

Zeitschrift für anorganische Chemie 216 (1934), S. 223-227

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ISSN: 0863-1786

Keywords: Chemistry ; Inorganic Chemistry

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Chemistry and Pharmacology

Notes: Tantal kann in sehr duktiler Form durch thermische Dissoziation von TaCl5 an einem glühenden Kerndraht dargestellt werden, falls dafür Sorge getragen wird, daß die Anwesenheit fremder Gase möglichst gut vermieden wird: es empfiehlt sich z. B., das TaCl5 vorher im Vakuum zu sublimieren.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1002/zaac.19342160303

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26

Electronic Resource

Die Häufigkeit des Zirkoniums (1934)

v. Hevesy, G. ; Würstlin, K.

Weinheim : Wiley-Blackwell

Zeitschrift für anorganische Chemie 216 (1934), S. 305-311

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ISSN: 0863-1786

Keywords: Chemistry ; Inorganic Chemistry

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Chemistry and Pharmacology

Notes: Die Zirkonbestimmungen erstreckten sich auf 1175 Gesteinsproben und einige Steinmeteorite und Moldavite. Die gesamte Untersuchung wurde ohne Zuhilfenahme eines chemischen Eingriffs, ausschließlich auf röntgenspektroskopischem Wege, ausgeführt, wobei die Sekundärstrahlspektroskopie (Anregung der Röntgenlinien mit Röntgenstrahlen) zur Verwendung gelangt ist.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1002/zaac.19342160311

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27

Electronic Resource

Über die Häufigkeit des Strontiums (1934)

von Hevesy, G. ; Würstlin, K.

Weinheim : Wiley-Blackwell

Zeitschrift für anorganische Chemie 216 (1934), S. 312-314

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ISSN: 0863-1786

Keywords: Chemistry ; Inorganic Chemistry

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Chemistry and Pharmacology

Notes: Der durchschnittliche Strontiumgehalt von Eruptivgesteinen beträgt 1 g Strontium in 9000 Gewichtsteilen Gestein.

Additional Material: 1 Ill.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1002/zaac.19342160312

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28

Electronic Resource

Weinheim : Wiley-Blackwell

Zeitschrift für anorganische Chemie 216 (1934)

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ISSN: 0863-1786

Keywords: Chemistry ; Inorganic Chemistry

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Chemistry and Pharmacology

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1002/zaac.19342160401

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29

Electronic Resource

Zur Reaktion des Wismuts mit Thioharnstoff (1934)

Dubský, J. V. ; Okác̆, A. ; Okác̆, B.

Weinheim : Wiley-Blackwell

Zeitschrift für anorganische Chemie 216 (1934), S. 386-390

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ISSN: 0863-1786

Keywords: Chemistry ; Inorganic Chemistry

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Chemistry and Pharmacology

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1002/zaac.19342160408

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30

Electronic Resource

Die Reaktionsprodukte der verschiedenen Kohlenstoffformen mit Fluor II (Kohlenstoff-monofluorid) (1934)

Ruff, Otto ; Bretschneider, Otto

Weinheim : Wiley-Blackwell

Zeitschrift für anorganische Chemie 217 (1934), S. 1-18

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Keywords: Chemistry ; Inorganic Chemistry

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Chemistry and Pharmacology

Notes: Fluor bildet bei nicht zu hoher Temperatur mit Kohlenstoff eines jeden Ordnungsgrades eine feste Valenzverbindung der Grenzzusammensetzung CF; sie wird durch Sättigen z. B. sauerstofffreien Norits bei 280° mit Fluor von 25 mm Druck und von Graphit bei 420° mit Fluor unter 760 mm Druck erhalten. In der Verbindung sind zwischen die Basisebenen des Graphits auf je zwei C-Atome zwei Fluorionen eingebaut. Die Struktur, die physikalischen und chemischen Eigenschaften des Fluorids werden mitgeteilt. Bei höheren Temperaturen entstehen aus Norit und Graphit, und natürlich auch CF, gasförmige C-Fluoride. Ihre Bildungsweise wird klargestellt, ihre Zusammensetzung in Abhängigkeit von den Bildungsbedingungen ermittelt.

Additional Material: 4 Ill.

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URL: http://dx.doi.org/10.1002/zaac.19342170102

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Gleichzeitige Bestimmung der Gleichgewichtskonstanten der Reaktionen: CO+H2O ⇄ CO2+H2; 2CO+2H2 ⇄ CO2+CH4; CO + 3H2 ⇄ CH2 + H2O; CO2 + 4H2 ⇄ CH2 + 2H2O unter Anwendung von Nickelkatalysatoren mit Verstärkern (1934)

Ghosh, J. C. ; Chakravarty, K. M. ; Bakshi, J. B.

Weinheim : Wiley-Blackwell

Zeitschrift für anorganische Chemie 217 (1934), S. 277-283

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ISSN: 0863-1786

Keywords: Chemistry ; Inorganic Chemistry

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Chemistry and Pharmacology

Additional Material: 6 Ill.

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URL: http://dx.doi.org/10.1002/zaac.19342170308

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Weinheim : Wiley-Blackwell

Zeitschrift für anorganische Chemie 217 (1934)

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Keywords: Chemistry ; Inorganic Chemistry

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Chemistry and Pharmacology

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URL: http://dx.doi.org/10.1002/zaac.19342170401

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Über Mischkristalle in der Vitriolreihe. III (1934)

Benrath, A. ; Triemann, W.

Weinheim : Wiley-Blackwell

Zeitschrift für anorganische Chemie 217 (1934), S. 347-352

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Keywords: Chemistry ; Inorganic Chemistry

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Chemistry and Pharmacology

Additional Material: 3 Ill.

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URL: http://dx.doi.org/10.1002/zaac.19342170405

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34

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Kinetik der Sol-Gel-Umwandlung. II. Einfluß der Solkonzentration und der Temperatur auf die Gerinnung anorganischer Gallerten (1934)

Dube, Hira Lal

Weinheim : Wiley-Blackwell

Zeitschrift für anorganische Chemie 217 (1934), S. 284-288

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ISSN: 0863-1786

Keywords: Chemistry ; Inorganic Chemistry

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Chemistry and Pharmacology

Notes: 1. Der Einfluß der Verdünnung und der Temperatur auf die Gallertbildung der Sole von Ferriphosphat, Zirkonium- und Aluminiumoxyd ist untersucht worden.

Additional Material: 6 Tab.

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Über die photochemische Oxydation von Lösungen mit dreiwertigem Antimon und ihre Absorptionsspektren (1934)

Brüll, Wilhelm

Weinheim : Wiley-Blackwell

Zeitschrift für anorganische Chemie 217 (1934), S. 401-416

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ISSN: 0863-1786

Keywords: Chemistry ; Inorganic Chemistry

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Chemistry and Pharmacology

Notes: Salzsaure und weinsaure Lösungen von Antimontrioxyd sowie solche von Antimonchlorid in gesättigter Kochsalzlösung sind schon durch Sonnenlicht in Gefäßen aus gewöhnlichem Glas photochemisch aktivierbar; sie oxydieren sich z. B. bei Gegenwart von elementarem Sauerstoff. Lösungen von Brechweinstein, von Antimontrioxyd in starker Schwefelsäure, von Antimontrichlorid in Tetrachlorkohlenstoff oder gesättigter Chlorcalciumlösung zeigen diese Erscheinung erst bei Einwirkung von Licht kürzerer Wellenlänge deutlich.

Additional Material: 1 Ill.

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URL: http://dx.doi.org/10.1002/zaac.19342170411

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36

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Zum quantitativen spektralanalytischen Nachweis von Zinn in Kupfer (1934)

Winkler, J. E. R.

Weinheim : Wiley-Blackwell

Zeitschrift für anorganische Chemie 218 (1934), S. 45-48

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Keywords: Chemistry ; Inorganic Chemistry

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Chemistry and Pharmacology

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1002/zaac.19342180106

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37

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Ein Verfahren zur Bestimmung der Calciumionenkonzentration und ihre Anwendung zur Bestimmung der Dissoziation des Calciumhydroxyds (1934)

Kilde, Georg

Weinheim : Wiley-Blackwell

Zeitschrift für anorganische Chemie 218 (1934), S. 113-128

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ISSN: 0863-1786

Keywords: Chemistry ; Inorganic Chemistry

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Chemistry and Pharmacology

Additional Material: 4 Ill.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1002/zaac.19342180202

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38

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Das Verhalten des Magnesiumions zu Ammoniak in wäßriger Lösung. II. Bestimmung des H3N-Dampfdruckes über ammoniakalischen Lösungen von Mg-Salzen (1934)

Fredholm, Hugo

Weinheim : Wiley-Blackwell

Zeitschrift für anorganische Chemie 218 (1934), S. 169-180

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ISSN: 0863-1786

Keywords: Chemistry ; Inorganic Chemistry

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Chemistry and Pharmacology

Additional Material: 7 Ill.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1002/zaac.19342180208

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39

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Zur Azotierung des Calciums (1934)

Hartmann, Hellmuth ; Fröhlich, Hans Joachim

Weinheim : Wiley-Blackwell

Zeitschrift für anorganische Chemie 218 (1934), S. 190-192

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Keywords: Chemistry ; Inorganic Chemistry

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Chemistry and Pharmacology

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URL: http://dx.doi.org/10.1002/zaac.19342180210

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40

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Physikalisch-chemische Messungen am Fluorwasserstoff. II (1934)

Fredenhagen, Karl

Weinheim : Wiley-Blackwell

Zeitschrift für anorganische Chemie 218 (1934), S. 161-168

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ISSN: 0863-1786

Keywords: Chemistry ; Inorganic Chemistry

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Chemistry and Pharmacology

Notes: 1. Die Dissoziationsisothermen des polymeren Fluorwasserstoffdampfes wurden bei den Temperaturen 26, 32 und 38°C experimentell bestimmt.

Additional Material: 3 Ill.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1002/zaac.19342180207

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41

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Schmelzdiagramm des Systems ZrO2—SiO2 (1934)

Žirnowa, Nina

Weinheim : Wiley-Blackwell

Zeitschrift für anorganische Chemie 218 (1934), S. 193-200

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ISSN: 0863-1786

Keywords: Chemistry ; Inorganic Chemistry

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Chemistry and Pharmacology

Notes: 1. Es wurde die Liquiduslinie im System ZrO2-SiO2 ermittelt.

Additional Material: 2 Ill.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1002/zaac.19342180211

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Weinheim : Wiley-Blackwell

Zeitschrift für anorganische Chemie 218 (1934)

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Keywords: Chemistry ; Inorganic Chemistry

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Chemistry and Pharmacology

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1002/zaac.19342180301

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43

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Über Gold-Calcium-Legierungen (1934)

Weibke, Fr. ; Bartels, W.

Weinheim : Wiley-Blackwell

Zeitschrift für anorganische Chemie 218 (1934), S. 241-248

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ISSN: 0863-1786

Keywords: Chemistry ; Inorganic Chemistry

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Chemistry and Pharmacology

Notes: Die thermische Untersuchung des Systems Au-Ca ergibt das Auftreten von sechsintermediären Kristallarten, von denen drei (Au4Ca, Au2Ca und AuCa1,11) durch Maxima gekennzeichnet sind, während die übrigen (Au3Ca, AuCa1,33 und AuCa2) durch peritektische Umsetzungen entstehen. Die Phase AuCa1,11 besitzt als einzige ein ausgedehntes Homogenitätsgebiet (49 - 56 At.-%, Ca). Au2Ca und AuCa1,11 bilden je zwei Modifikationen. Die mikroskopischen Befunde (bis 35 At.-% Ca) sind in Übereinstimmung mit den Ergebnissen der thermischen Analyse.

Additional Material: 6 Ill.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1002/zaac.19342180304

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44

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Der Einfluß von Gelatine auf die Lösungsgeschwindigkeit des Zinks (1934)

Jermolenko, N.

Weinheim : Wiley-Blackwell

Zeitschrift für anorganische Chemie 218 (1934), S. 255-256

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Keywords: Chemistry ; Inorganic Chemistry

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Chemistry and Pharmacology

Additional Material: 2 Ill.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1002/zaac.19342180308

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45

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Die Farbe und Natur von Jodlösungen in verschiedenen Lösungsmitteln (1934)

Chirnoagǎ, Eugen ; Chirnoagǎ, Eugenia

Weinheim : Wiley-Blackwell

Zeitschrift für anorganische Chemie 218 (1934), S. 273-300

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ISSN: 0863-1786

Keywords: Chemistry ; Inorganic Chemistry

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Chemistry and Pharmacology

Notes: Wir haben eine Hypothese vorgeschlagen, welche eine ursächliche Beziehung zwischen der Struktur und der Farbe der Jodlösungen feststellt.

Additional Material: 7 Ill.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1002/zaac.19342180311

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46

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Beiträge zur systematischen Verwandtschaftslehre. 61. Bau und Verwendung eines Hochtemperaturkalorimeters mit geschlossenem Reaktionsraum (1934)

Biltz, Wilhelm ; Rohlffs, Gerhard ; v. Vogel, Hans Ulrich

Weinheim : Wiley-Blackwell

Zeitschrift für anorganische Chemie 220 (1934), S. 113-141

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ISSN: 0863-1786

Keywords: Chemistry ; Inorganic Chemistry

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Chemistry and Pharmacology

Additional Material: 2 Ill.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1002/zaac.19342200202

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47

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Die Polytherme CoCl2-H2O (1934)

Bernath, Hanna

Weinheim : Wiley-Blackwell

Zeitschrift für anorganische Chemie 220 (1934), S. 142-144

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ISSN: 0863-1786

Keywords: Chemistry ; Inorganic Chemistry

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Chemistry and Pharmacology

Additional Material: 1 Ill.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1002/zaac.19342200203

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48

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Das amphotere Verhalten von Metallhydroxyden. VII. Über Halogeno-hydroxo- und Brenzkatechinato-hydroxosalze zweiwertiger Schwermetalle (1934)

Scholder, R.

Weinheim : Wiley-Blackwell

Zeitschrift für anorganische Chemie 220 (1934), S. 209-218

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ISSN: 0863-1786

Keywords: Chemistry ; Inorganic Chemistry

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Chemistry and Pharmacology

Notes: Die Darstellung von Halogeno-hydroxo- und Brenzcatechinato-hydrososalzen von Cu, Zn, Sn(II), Pb(II) wird beschrieben und ihre Konstitution erörtert.

Additional Material: 4 Tab.

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URL: http://dx.doi.org/10.1002/zaac.19342200215

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49

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Über das Schwefelmonoxyd. 4. Mitteilung. Die Oxydation des Schwefels (1934)

Schenk, Peter W.

Weinheim : Wiley-Blackwell

Zeitschrift für anorganische Chemie 220 (1934), S. 268-272

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Keywords: Chemistry ; Inorganic Chemistry

Source: Wiley InterScience Backfile Collection 1832-2000

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Notes: Die Oxydation von Schwefel wird unter verschiedenen Bedingungen auf die Entstehung von Schwefelmonoxyd hin untersucht.

Additional Material: 1 Ill.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1002/zaac.19342200307

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50

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Substitution und Abbau des Alkalis im blauen Ultramarin (1934)

Leschewski, Kurt ; Möller, Heinz ; Podschus, Ernst

Weinheim : Wiley-Blackwell

Zeitschrift für anorganische Chemie 220 (1934), S. 317-328

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Keywords: Chemistry ; Inorganic Chemistry

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Chemistry and Pharmacology

Notes: Ultramarinblau nimmt in den Schmelzen der Nitrate unabhängig von der Schmelztemperatur andere Alkalimetalle im Austausch gegen Natrium auf; die ausgetauschten Mengen sind für jedes Metall charakteristisch und von seinem Ionenvolumen abhängig.

Additional Material: 3 Ill.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1002/zaac.19342200311

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51

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Zur Hydrothermalsynthese einiger Carbonate (1934)

Lemke, Alfred ; Hiltz, Wilhelm

Weinheim : Wiley-Blackwell

Zeitschrift für anorganische Chemie 220 (1934), S. 312-316

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ISSN: 0863-1786

Keywords: Chemistry ; Inorganic Chemistry

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Chemistry and Pharmacology

Additional Material: 5 Ill.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1002/zaac.19342200310

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52

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Das Zustandsdiagramm des Systems Kupfer-Indium (1934)

Weibke, Friedrich ; Eggers, Hans

Weinheim : Wiley-Blackwell

Zeitschrift für anorganische Chemie 220 (1934), S. 273-292

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Keywords: Chemistry ; Inorganic Chemistry

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Chemistry and Pharmacology

Notes: α-Phase. Feste Lösung von Indium in Kupfer; Sättigungsgrenze bei 715° 16,0%, bei 574° 19,20% und bei 20° 6,5% In. Cu-Gitter durch Indiumzusatz stark aufgeweitet.

Additional Material: 13 Ill.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1002/zaac.19342200308

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53

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Die Kohlenstofflöslichkeit von Eisen-Chrom-Silizium-Legierungen (1934)

Lucas, Otto ; Wentrup, Hanns

Weinheim : Wiley-Blackwell

Zeitschrift für anorganische Chemie 220 (1934), S. 329-333

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Keywords: Chemistry ; Inorganic Chemistry

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Chemistry and Pharmacology

Additional Material: 4 Ill.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1002/zaac.19342200312

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54

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Über aktives Chrom-(3)-oxyd (1934)

Kohlschütter, H. W.

Weinheim : Wiley-Blackwell

Zeitschrift für anorganische Chemie 220 (1934), S. 370-376

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Keywords: Chemistry ; Inorganic Chemistry

Source: Wiley InterScience Backfile Collection 1832-2000

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Additional Material: 2 Ill.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1002/zaac.19342200403

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Weinheim : Wiley-Blackwell

Zeitschrift für anorganische Chemie 220 (1934)

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Keywords: Chemistry ; Inorganic Chemistry

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Chemistry and Pharmacology

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1002/zaac.19342200401

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56

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Die Darstellung reinen, feinpulvringen Vanadiums (1934)

Döring, Theodor ; Geiler, Johannes

Weinheim : Wiley-Blackwell

Zeitschrift für anorganische Chemie 221 (1934), S. 56-62

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Keywords: Chemistry ; Inorganic Chemistry

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Chemistry and Pharmacology

Additional Material: 1 Ill.

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URL: http://dx.doi.org/10.1002/zaac.19342210111

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Über die Konstitution der Unterphosphorsäure (1934)

Hantzsch, A.

Weinheim : Wiley-Blackwell

Zeitschrift für anorganische Chemie 221 (1934), S. 63-64

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Keywords: Chemistry ; Inorganic Chemistry

Source: Wiley InterScience Backfile Collection 1832-2000

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URL: http://dx.doi.org/10.1002/zaac.19342210112

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58

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Über die Bildung hochschmelzender Metallcarbide beim Glühen eines Kohlenfadens im Dampf einer flüchtigen Halogenverbindung des Metalles (1934)

Burgers, W. G. ; Basart, J. C. M.

Weinheim : Wiley-Blackwell

Zeitschrift für anorganische Chemie 216 (1934), S. 209-222

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Keywords: Chemistry ; Inorganic Chemistry

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Chemistry and Pharmacology

Notes: Es wird die Reaktion, welche beim Glühen eines Kohlenfadens im Dampf von TiCl4, ZrCl4 oder TaCl5 (im ersteren Fall bei Anwesenheit von Wasserstoff) stattfindet, studiert, und zwar einerseits durch die Änderung des elektrischen Widerstandes des Fadens, andererseits mit Hilfe einer röntgenographischen Untersuchung der erhaltenen Produkte.

Additional Material: 3 Ill.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1002/zaac.19342160302

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Die Zusammensetzung und Bildungswärme der aus Norit und aus SiC gebildeten Kohlenstofffluoridgemische. (Zugleich zur Kenntnis der Bildungswärmen von CF4 und SiC) (1934)

Ruff, Otto ; Bretschneider, Otto

Weinheim : Wiley-Blackwell

Zeitschrift für anorganische Chemie 217 (1934), S. 19-21

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Keywords: Chemistry ; Inorganic Chemistry

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Chemistry and Pharmacology

Additional Material: 2 Tab.

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URL: http://dx.doi.org/10.1002/zaac.19342170103

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Aktive Oxyde. LXXII. Beitrag zur Frage nach dem Verlauf von Reaktionen im festen Zustande (1934)

Rosenkranz, Emil ; Steiner, Béla ; Kittel, Herbert ; [et al.]

Weinheim : Wiley-Blackwell

Zeitschrift für anorganische Chemie 217 (1934), S. 22-26

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Keywords: Chemistry ; Inorganic Chemistry

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Chemistry and Pharmacology

Additional Material: 2 Ill.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1002/zaac.19342170104

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61

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Bemerkung zu unserer Arbeit: Gewinnung von reinem Schwefelwasserstoff, Tensionen und Dichten. (Das Atomgewicht des Schwefels) (1934)

Klemenc, A. ; Bankowski, O.

Weinheim : Wiley-Blackwell

Zeitschrift für anorganische Chemie 217 (1934), S. 62-64

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Keywords: Chemistry ; Inorganic Chemistry

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Chemistry and Pharmacology

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1002/zaac.19342170109

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62

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Die Sauerstofffluoride O2F2 und OF (1934)

Ruff, Otto ; Menzel, Walter

Weinheim : Wiley-Blackwell

Zeitschrift für anorganische Chemie 217 (1934), S. 85-92

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ISSN: 0863-1786

Keywords: Chemistry ; Inorganic Chemistry

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Chemistry and Pharmacology

Notes: Die wichtigsten physikalischen und chemischen Konstanten der neuen Sauerstofffluoride O2F2 und OF werden mitgeteilt. Eine für die Darstellung von OF aus O2F2 geeignete Apparatur wird beschrieben.

Additional Material: 2 Ill.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1002/zaac.19342170112

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Zur Nomenklatur (1934)

Ebert, Fritz ; Hartmann, Hellmuth

Weinheim : Wiley-Blackwell

Zeitschrift für anorganische Chemie 217 (1934), S. 156-156

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ISSN: 0863-1786

Keywords: Chemistry ; Inorganic Chemistry

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Chemistry and Pharmacology

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1002/zaac.19342170204

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Über Mischkristalle in der Vitriolreihe (1934)

Benrath, A. ; Blankenstein, A.

Weinheim : Wiley-Blackwell

Zeitschrift für anorganische Chemie 217 (1934), S. 170-174

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ISSN: 0863-1786

Keywords: Chemistry ; Inorganic Chemistry

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Chemistry and Pharmacology

Additional Material: 4 Ill.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1002/zaac.19342170207

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Weinheim : Wiley-Blackwell

Zeitschrift für anorganische Chemie 217 (1934)

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ISSN: 0863-1786

Keywords: Chemistry ; Inorganic Chemistry

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Chemistry and Pharmacology

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1002/zaac.19342170201

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Über die Konstitution der homogenen Säuren und die Beeinflussung ihrer Azidität durch Lösungsmittel. Nach Versuchen mit Indikatoren (1934)

Müller, Arno

Weinheim : Wiley-Blackwell

Zeitschrift für anorganische Chemie 217 (1934), S. 113-153

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ISSN: 0863-1786

Keywords: Chemistry ; Inorganic Chemistry

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Chemistry and Pharmacology

Additional Material: 3 Ill.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1002/zaac.19342170202

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Über Verdampfung, Löslichkeit und Oxydation des metallischen Quecksilbers (1934)

Stock, Alfred ; Cucuel, Friedrich ; Gerstner, Franz ; [et al.]

Weinheim : Wiley-Blackwell

Zeitschrift für anorganische Chemie 217 (1934), S. 241-253

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ISSN: 0863-1786

Keywords: Chemistry ; Inorganic Chemistry

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Chemistry and Pharmacology

Additional Material: 1 Ill.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1002/zaac.19342170304

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Präzisionsmessung der Gitterkonstante von kubischraumzentriertem β-Wolfram (1934)

Neuburger, M. C.

Weinheim : Wiley-Blackwell

Zeitschrift für anorganische Chemie 217 (1934), S. 154-156

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ISSN: 0863-1786

Keywords: Chemistry ; Inorganic Chemistry

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Chemistry and Pharmacology

Additional Material: 2 Tab.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1002/zaac.19342170203

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Die Entstehung von Schwefelsäure und Schwefelwasserstoff bei der Zersetzung des Thiosulfats (1934)

Foerster, F. ; Umbach, H.

Weinheim : Wiley-Blackwell

Zeitschrift für anorganische Chemie 217 (1934), S. 175-188

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ISSN: 0863-1786

Keywords: Chemistry ; Inorganic Chemistry

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Chemistry and Pharmacology

Notes: 1. Läßt man verdünnte Natriumthiosulfatlösung langsam zu siedender HCl tropfen, so wird ein wesentlicher Teil der Thioschwefelsäure zu H2SO4 und H2S verseift. Dieser Vorgang verläuft nach der Bruttogleichung : \documentclass{article}\pagestyle{empty}\begin{document}$$ {\rm H}_{\rm 2} {\rm S}_{\rm 2} {\rm O}_{\rm 3} + {\rm H}_{\rm 2} {\rm O} \to {\rm H}_{\rm 2} {\rm SO}_{\rm 4} + {\rm H}_{\rm 2} {\rm S}{\rm .} $$\end{document} Ein quantitativer Zerfall in dieser Richtung konnte im Gegensatz zu Colsons Angaben nicht erreicht werden. Günstigstenfalls setzten sich 91% des angewandten Thiosulfats in diesem Sinne um.

Additional Material: 1 Ill.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1002/zaac.19342170208

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