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  • 1
    Publication Date: 2020-12-11
    Description: Convexity is an important property in nonlinear optimization since it allows to apply efficient local methods for finding global solutions. We propose to apply symbolic methods to prove or disprove convexity of rational functions over a polyhedral domain. Our algorithms reduce convexity questions to real quantifier elimination problems. Our methods are implemented and publicly available in the open source computer algebra system REDUCE. Our long term goal is to integrate REDUCE as a workhorse'' for symbolic computations into a numerical solver.
    Keywords: ddc:510
    Language: English
    Type: reportzib , doc-type:preprint
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  • 2
    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.
    Keywords: ddc:510
    Language: English
    Type: reportzib , doc-type:preprint
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  • 3
    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.
    Keywords: ddc:510
    Language: English
    Type: reportzib , doc-type:preprint
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  • 4
    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.
    Keywords: ddc:510
    Language: English
    Type: reportzib , doc-type:preprint
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  • 5
    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.
    Keywords: ddc:510
    Language: English
    Type: reportzib , doc-type:preprint
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  • 6
    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.
    Keywords: ddc:510
    Language: English
    Type: reportzib , doc-type:preprint
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  • 7
    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.
    Keywords: ddc:510
    Language: English
    Type: reportzib , doc-type:preprint
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  • 8
    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.
    Keywords: ddc:510
    Language: English
    Type: reportzib , doc-type:preprint
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  • 9
    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.
    Keywords: ddc:510
    Language: English
    Type: reportzib , doc-type:preprint
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  • 10
    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.
    Keywords: ddc:510
    Language: English
    Type: reportzib , doc-type:preprint
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  • 11
    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.
    Keywords: ddc:510
    Language: English
    Type: reportzib , doc-type:preprint
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  • 12
    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.
    Keywords: ddc:510
    Language: English
    Type: reportzib , doc-type:preprint
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  • 13
    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
    Keywords: ddc:510
    Language: English
    Type: reportzib , doc-type:preprint
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  • 14
    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.
    Keywords: ddc:510
    Language: English
    Type: reportzib , doc-type:preprint
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  • 15
    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.
    Keywords: ddc:510
    Language: English
    Type: reportzib , doc-type:preprint
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  • 16
    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.
    Keywords: ddc:510
    Language: English
    Type: reportzib , doc-type:preprint
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  • 17
    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!
    Keywords: ddc:510
    Language: English
    Type: reportzib , doc-type:preprint
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  • 18
    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.
    Keywords: ddc:510
    Language: German
    Type: reportzib , doc-type:preprint
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  • 19
    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.
    Keywords: ddc:510
    Language: English
    Type: reportzib , doc-type:preprint
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  • 20
    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.
    Keywords: ddc:510
    Language: English
    Type: reportzib , doc-type:preprint
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  • 21
    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.
    Keywords: ddc:510
    Language: English
    Type: reportzib , doc-type:preprint
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  • 22
    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.
    Keywords: ddc:510
    Language: English
    Type: doctoralthesis , doc-type:doctoralThesis
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  • 23
    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.
    Keywords: ddc:510
    Language: English
    Type: reportzib , doc-type:preprint
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  • 24
    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.
    Keywords: ddc:510
    Language: English
    Type: reportzib , doc-type:preprint
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  • 25
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Chemie Ingenieur Technik - CIT 21 (1949) 
    ISSN: 0009-286X
    Keywords: Chemistry ; Industrial Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
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  • 26
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Chemie Ingenieur Technik - CIT 21 (1949), S. 6-8 
    ISSN: 0009-286X
    Keywords: Chemistry ; Industrial Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Die Anordnung dient zur Messung von Dampfdruckerniedrigungen verdünnter Lösungen (10-3 Mol/l) insbesondere assoziierender Substanzen. Es wurde eine Meßanordnung entwickelt, in der die durch kleine Druckdifferenzen verursachte Ausbuchtung der Wölbung des Meniskus eines Hg-Manometers nach dem Prinzip eines Photometers lichtelektrisch mit einem Vakuumthermoelement gemessen wird. Die Anordnung gestattet unabhängig vom Gesamtdruck noch Druckschwankungen von 10-4 mm Hg zu messen.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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  • 27
    ISSN: 0009-286X
    Keywords: Chemistry ; Industrial Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Es werden einige Regeleinrichtungen besprochen, die zum Aufbau von im wesentlichen automatisch arbeitenden Destillationskolonnen sowohl für diskontinuierlichen als auch für kontinuierlichen Betrieb führten.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
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  • 28
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Chemie Ingenieur Technik - CIT 21 (1949), S. 1-6 
    ISSN: 0009-286X
    Keywords: Chemistry ; Industrial Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Unsere wichtigsten chemischen Großsynthesen gehen von Acetylen bzw. vom Kohlenoxyd-Wasserstoff-Gemisch aus. Die Arbeiten im letzten Jahrzehnt bezweckten, diese Rohstoffe unmittelbar aus dem Ferngas zu gewinnen. Von den entwickelten Verfahren verdient insbesondere das Sauerstoff-Verfahren Beachtung. Es liefert ein Synthesegas mit nur noch 0,2% Methan und ist unempfindlich gegen den im Ferngas vorhandenen organischen Schwefel. Eine etwa folgende Umsetzung des Kohlenoxydes mit Wasserdampf zu CO2 und Wasserstoff kann in unmittelbarem Ánschluß an der Kohlenwasserstoff-Spaltung vorgenommen werden, so daß kein neuer Dampfverbrauch auftritt. Während in der folgenden Arbeit über das Verfahren zur Verarbeitung des gesamten Ferngases auf Kohlenoxyd und Wasserstoff berichtet wird, wird in einer weiteren Arbeit die chemische Verwertung der einzelnen Bestandteile des Ferngases behandelt.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
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  • 29
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Chemie Ingenieur Technik - CIT 21 (1949), S. 19-24 
    ISSN: 0009-286X
    Keywords: Chemistry ; Industrial Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Nach den verfügbaren amerikanischen Quellen wird zusammenfassend über die seit etwa 1940 in Amerika erreichten Fortschritte auf dem Gebiet der Sauerstoff-Erzeugung und -Anwendung berichtet, besonders über Versuche an Austauschböden und Trennkolonnen für kleinere, meist leichtbewegliche Anlagen, über die Mittel zur Kälteerzeugung, über die Herstellung und den Versand von flüssigem Sauerstoff sowie über die unmittelbare Erzeugung von hochkomprimiertem Sauerstoff für die Flaschenfüllung durch Verdampfung des flüssigen Sauerstoffs im Zerlegungsapparat. Weiter wird ein neuer Austauschertyp besprochen und auf neu erschlossene Anwendungsgebiete für billigen, mäßig reinen Sauerstoff hingewiesen.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
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  • 30
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Chemie Ingenieur Technik - CIT 21 (1949), S. 15-18 
    ISSN: 0009-286X
    Keywords: Chemistry ; Industrial Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Bei Kohlenoxyd-Hydrierungen unter Drucken zwischen 300 und 1000 at und Temperaturen über 400° erwiesen sich z. T. sog. „kohlenoxydfeste“ metallische Werkstoffe, insbesondere Stähle mit mehr als 13% Chrom, für den praktischen Betrieb als ungeeignet, obwohl sie anscheinend von Kohlenoxyd nicht abgebaut wurden. Es wurden daher 20 derartige Stähle und 6 eisenfreie Metallproben gegenüber Wassergas bei 1000 at und Temperaturen zwischen 300 und 450° untersucht und aus den Ergebnissen Folgerungen für die praktische Verwendungsmöglichkeit im Apparafebau gezogen.
    Additional Material: 1 Ill.
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  • 31
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Chemie Ingenieur Technik - CIT 21 (1949), S. 24-30 
    ISSN: 0009-286X
    Keywords: Chemistry ; Industrial Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
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  • 32
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Chemie Ingenieur Technik - CIT 21 (1949), S. 31-31 
    ISSN: 0009-286X
    Keywords: Chemistry ; Industrial Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
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  • 33
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Chemie Ingenieur Technik - CIT 21 (1949), S. 31-32 
    ISSN: 0009-286X
    Keywords: Chemistry ; Industrial Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
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  • 34
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Chemie Ingenieur Technik - CIT 21 (1949), S. 33-37 
    ISSN: 0009-286X
    Keywords: Chemistry ; Industrial Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
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  • 35
    Electronic Resource
    Electronic Resource
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    Chemie Ingenieur Technik - CIT 21 (1949), S. 37-38 
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    Source: Wiley InterScience Backfile Collection 1832-2000
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    Chemie Ingenieur Technik - CIT 21 (1949), S. 32-32 
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    Chemie Ingenieur Technik - CIT 21 (1949), S. 39-39 
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    Chemie Ingenieur Technik - CIT 21 (1949), S. 41-41 
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    Chemie Ingenieur Technik - CIT 21 (1949), S. 42-46 
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    Chemie Ingenieur Technik - CIT 21 (1949), S. 48-48 
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    Chemie Ingenieur Technik - CIT 21 (1949), S. 48-48 
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    Chemie Ingenieur Technik - CIT 21 (1949), S. 48-48 
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    Chemie Ingenieur Technik - CIT 21 (1949), S. 48-48 
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    Chemie Ingenieur Technik - CIT 21 (1949), S. 63-66 
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    Source: Wiley InterScience Backfile Collection 1832-2000
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    Notes: Die Angabe, daß sich die Ausscheidung von Härtebildern mit Orthophosphaten in wässeriger Lösung unter Bildung von Tricalciumphosphat vollziehe, ist unzutreffend. Der Niederschlag dürfte vielmehr die Formel des Hydroxylapatits haben.
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    Chemie Ingenieur Technik - CIT 21 (1949), S. 49-57 
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    Source: Wiley InterScience Backfile Collection 1832-2000
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    Notes: Bis 1940 war die Anwendung hoher Vakua fast nur auf das Laboratorium beschränkt, in der Technik evakuierte nur die Röhrenindustrie bis auf Drucke von beinahe 10-7 mm Hg, aber es handelte sich auch hier meist nur um verhältnismäßig kleine Volumina. Die anschließende Entwicklung wurde durch mehrere Ereignisse besonders gefördert: durch die Konstruktion hervorragender Pumpen in Deutschland und Amerika, durch die Schaffung guter Gläser in Jena, durch die Erfolge der Vakuumdestillation von Fetten, Ölen und empfindlichen organischen Substanzen in England, Deutschland und später in USA, und schließlich durch das amerikanische Atombombenprojekt, wo bereits bei der Gasdiffusions- und elektromagnetischen Trennung der Uran-Isotope die ersten großen Vakuum-Probleme auftraten. Heute ist selbst die großtechnische Erzeugung von Hochvakuum zwischen -100° und + 1000° C ein untergeordnetes Problem der Verfahrenstechnik geworden.
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    Chemie Ingenieur Technik - CIT 21 (1949), S. 61-63 
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    Source: Wiley InterScience Backfile Collection 1832-2000
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    Notes: Es wird über Versuche mit zwei Ausführungen von Pilzglocken aus Porzellan berichtet, die in Rektifizierböden eingebaut waren. Wirkung, Druckverlust und Flüssigkeitsinhalt der Sälen wurden ermittelt. Um eine gute Wirkung zu erreichen, müssen die Einzelabmessungen des Bodens entsprechend gewählt werden. Auch der Einbau einer Staurippe erhöht die Bodenwirkung.
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    Notes: Die hier beschriebenen Methoden sollen es dem Schichtarbeiter mit einfachen Mitteln ermöglichen, kurzfristig eine gefährliche Acetylen-Anreicherung zu erkennen. Die Ergebnisse werden mit denen quantitativer Methoden verglichen.
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    Chemie Ingenieur Technik - CIT 21 (1949), S. 68-70 
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    Chemie Ingenieur Technik - CIT 21 (1949), S. 67-67 
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    Source: Wiley InterScience Backfile Collection 1832-2000
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    Notes: Der im folgenden beschriebene Kolbenverdichter arbeitet mit ungeschmierten Kolben und Stopfbüchsen. Die Abdichtung wird durch Labyrinthdichtungen erreicht. Dadurch behält das verdichtete Medium die ursprüngliche Reinheit, so daß der Verdichter in der chemischen Industrie und der Lebensmittelindustrie da verwendet werden kann, wo völlig reine Druckluft gebraucht wird.
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    Chemie Ingenieur Technik - CIT 21 (1949), S. 71-73 
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    Chemie Ingenieur Technik - CIT 21 (1949), S. 68-68 
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    Source: Wiley InterScience Backfile Collection 1832-2000
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    Notes: In den letzten Jahren hat die Fluorchemie, insbesondere die verschiedener organischer fluorierter Verbindungen, erheblich an praktischer Bedeutung gewonnen. Da in einigen Veröffentlichungenz. B. DECHEMA-Werkstofftabellen 1948; ferner Ind. Engng. Chem. 39, 12a u. 91a [1947]. bereits auf die gute Eignung des Silbers als Apparatebauwerkstoff für technische Reaktionen mit Fluorverbindungen hingewiesen worden ist, seien nachstehend einige quantitative Angaben gemasht, die das Ergebnis einer 1944 laboratoriumsmäßig durchgeführten Korrosionsprüfung darsfellen.
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    Chemie Ingenieur Technik - CIT 21 (1949), S. 74-74 
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    Chemie Ingenieur Technik - CIT 21 (1949), S. 76-78 
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    Chemie Ingenieur Technik - CIT 21 (1949), S. 87-87 
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    Chemie Ingenieur Technik - CIT 21 (1949), S. 89-94 
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    Source: Wiley InterScience Backfile Collection 1832-2000
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    Notes: Die technisch-wissenschaftliche Forschung der letzten Jahrzehnte brachte eine Erweiterung und Vertiefung unserer Erkenntnisse über die beim gekoppelten Wärme- und Stoffaustausch sich abspielenden Vorgänge. Trotzdem blieben noch Fragen ungeklärt, deren erschöpfende Behandlung für die rechnerische Erfassung baispielsweise der Trocknungsvorgänge unerläßlich ist. Zu diesen Fragen gehört der Zusammenhang zwischen Luftzustand und Gutstemperatur während des Trocknens bei bestimmten Arten der Gasströmung. Im folgenden werden diese Verhältnisse untersucht, wobei sich eine gute Übereinstimmung zwischen theoretischen und experimentellen Ergebnissen ergibt.
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    Notes: Die bisherigen Definitionen des Wirkungsgrades von Wärmeaustauschern konnten zwangsläufig nicht in jeder Hinsicht befriedigen. Es wird auch immer schwierig sein, einen Wirkungsgrabegriff auf energetischer Grundlage aufzustellen, solange der Wärmeaustauschapparat allein betrachtet wird, da sich Wärme- und Druckverluste jeweils verschieden auswirken. Daher sollte auch das Arbeitsverfahren, in das der Wärmeaustauscher eingeschaltet ist, mit in Betracht gezogen werden. Im folgenden wird gezeigt, daß sich dann ein auf energetischer Grundlage beruhender Gütegradbegriff schaffen läßt, der zwar von Fall zu Fall neu aufgestellt werden muß, dafür aber eine Reihe von Vorteilen für den Erzeuger und den Abnehmer von Wäreaustauschapparaten bietet.
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    Chemie Ingenieur Technik - CIT 21 (1949), S. 103-105 
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    Source: Wiley InterScience Backfile Collection 1832-2000
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    Notes: Der Auslaufbecher DIN 53211 ist ein einfaches, praktisch leicht zu handhabendes Betriebs-Gerät zur Beurteilung der Konsistenz besonders von Farben und Lacken. Die vorliegende Untersuchung zeigt, innerhalb welcher Grenzen der Auslaufbecher tatsächlich geeignet ist, ein zuverlässiges Maß für die Konsistenz mit ihren Nebenerscheinungen, z. B. für die Viskosität usw., zu sein. Der experimentelle Zusammenhang zwischen Auslaufzeit und Viskosität wird durch Versuche mit 11 Normalflüssigkeiten ermittelt. Die genaue Analyse der Versuchsergebnisse gibt einen interessanten Einblick in die Strömungsvorgänge bei diesem Gerät.
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    Chemie Ingenieur Technik - CIT 21 (1949), S. 100-102 
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    Source: Wiley InterScience Backfile Collection 1832-2000
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    Notes: Die Aufzeichnung polarographischer Kurven in Tintenschrift gestattet einfachstes Modellieren und Auswerten der Kurven. Für den Betrieb normaler Tintenschreiber unter Verstärkung der Elektrodenströme mittels Verstärker in Saugschaltung1 wurde während des Krieges ein vollelektrisch arbeitendes Zusatzgerät durchgebildet, in dem alle erforderlichen Schaltelemente und Verstellorgane zur Kurvenaufnahme untergebracht sind. Die einfach zu bedienende, robuste und universell verwendbare polarographische Meßeinrichtung läßt sich auch in technischen Betrieben zur Durchführung von Serienanalysen verwenden. Seine Wirkungsweise wird im folgenden unter Beifügung einiger charakteristischer Kurven erläutert.
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    Chemie Ingenieur Technik - CIT 21 (1949), S. 110-114 
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    Notes: Vielen Betrieben steht Kühlwasser zur Verfügung, das reich an Carbonathärte ist und daher leicht Versteinungen der Leitungen hervorruft. Um diese Steinbildung zu verhindern, hat sich der Zusatz geringer Mengen an Natriumhexametaphosphat bewährt. Während man zur Prüfung der Brauchbarkeit von Zusätzen bisher einfache Becherglasversuche angestellt hat, haben die Verfasser ein geeignetes, im Laboratorium durchführbares Prüfverfahren entwickelt, wobei die wesentlichen betrieblichen Faktoren berücksichtigt werden können. Im folgenden wird diese Apparatur beschrieben und dann werden damit erzielte Versuchsergebnisse mitgeteilt, die mit den in der Praxis gemachten Erfahrungen gut übereinstimmen. In einem Anhang wird schließlich über Becherglasversuche mit organischen Zusätzen berichtet.
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    Chemie Ingenieur Technik - CIT 21 (1949), S. 116-116 
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    Chemie Ingenieur Technik - CIT 21 (1949), S. 114-116 
    ISSN: 0009-286X
    Keywords: Chemistry ; Industrial Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Additional Material: 1 Ill.
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    Chemie Ingenieur Technik - CIT 21 (1949), S. 116-116 
    ISSN: 0009-286X
    Keywords: Chemistry ; Industrial Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
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    Chemie Ingenieur Technik - CIT 21 (1949), S. 116-116 
    ISSN: 0009-286X
    Keywords: Chemistry ; Industrial Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
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    Chemie Ingenieur Technik - CIT 21 (1949), S. 118-119 
    ISSN: 0009-286X
    Keywords: Chemistry ; Industrial Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
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    Chemie Ingenieur Technik - CIT 21 (1949), S. 117-118 
    ISSN: 0009-286X
    Keywords: Chemistry ; Industrial Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
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    Chemie Ingenieur Technik - CIT 21 (1949), S. 116-116 
    ISSN: 0009-286X
    Keywords: Chemistry ; Industrial Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
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    Chemie Ingenieur Technik - CIT 21 (1949), S. 121-121 
    ISSN: 0009-286X
    Keywords: Chemistry ; Industrial Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
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    Chemie Ingenieur Technik - CIT 21 (1949), S. 119-120 
    ISSN: 0009-286X
    Keywords: Chemistry ; Industrial Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
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    Chemie Ingenieur Technik - CIT 21 (1949), S. 121-126 
    ISSN: 0009-286X
    Keywords: Chemistry ; Industrial Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
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    Chemie Ingenieur Technik - CIT 21 (1949), S. 119-119 
    ISSN: 0009-286X
    Keywords: Chemistry ; Industrial Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
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    Chemie Ingenieur Technik - CIT 21 (1949), S. 126-127 
    ISSN: 0009-286X
    Keywords: Chemistry ; Industrial Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
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    Chemie Ingenieur Technik - CIT 21 (1949), S. 128-128 
    ISSN: 0009-286X
    Keywords: Chemistry ; Industrial Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
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    Chemie Ingenieur Technik - CIT 21 (1949), S. 128-128 
    ISSN: 0009-286X
    Keywords: Chemistry ; Industrial Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
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    Chemie Ingenieur Technik - CIT 21 (1949), S. 128-128 
    ISSN: 0009-286X
    Keywords: Chemistry ; Industrial Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
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    Chemie Ingenieur Technik - CIT 21 (1949), S. 128-128 
    ISSN: 0009-286X
    Keywords: Chemistry ; Industrial Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
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    Chemie Ingenieur Technik - CIT 21 (1949), S. 128-128 
    ISSN: 0009-286X
    Keywords: Chemistry ; Industrial Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
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    Chemie Ingenieur Technik - CIT 21 (1949) 
    ISSN: 0009-286X
    Keywords: Chemistry ; Industrial Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
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    Chemie Ingenieur Technik - CIT 21 (1949), S. 135-135 
    ISSN: 0009-286X
    Keywords: Chemistry ; Industrial Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
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    Weinheim : Wiley-Blackwell
    Chemie Ingenieur Technik - CIT 21 (1949), S. 129-135 
    ISSN: 0009-286X
    Keywords: Chemistry ; Industrial Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: In der vorhergehenden Arbeit1 war über ein Verfahren berichtet worden, nach dem aus Ferngas durch Totalspaltung mit Sauerstoff Synthesegas gewonnen werden kann. Das Ferngas enthält jedoch eine Reihe von wertvollen Bestandteilen, die für die Verarbeitung auf Synthesegas zu schade sind. Im folgenden wird beschrieben, wie diese Produkte zu isolieren sind und welche Möglichkeit für ihre Weiterverarbeitung gegeben ist. Dabei wird insbesondere das Sauerstoff-Verfahren besprochen, bei dem Methan und Sauerstoff erst nach vollendeter Mischung einer Flammenreaktion unterworfen werden, die durch Einspritzen von Wasser unterbrochen wird.
    Additional Material: 15 Ill.
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    Weinheim : Wiley-Blackwell
    Chemie Ingenieur Technik - CIT 21 (1949), S. 136-136 
    ISSN: 0009-286X
    Keywords: Chemistry ; Industrial Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Das indirekte Verfahren, nach dem Phosphat- bzw. Fluor-lonen durch die Extinktionsabnahme des Eisensalicylat-Komplexes bestimmt werden, kann auch für die Bestimmung der Schwefelsäure in Nitriersäure-Gemischen nutzbar gemacht werden.
    Additional Material: 1 Ill.
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    ISSN: 0009-286X
    Keywords: Chemistry ; Industrial Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Als Beitrag zur Weiterentwicklung des Verfahrens wird die Struktur von Zerstäubernebeln und die Tropfenbewegung besprochen und ein Weg zur Berechnung des Trocknungsverlaufes gezeigt.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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