Totalitarismustheorien in der jungen BRD: Zur Kritik des Nationalsozialismus und des Sowjetkommunismus in der Zeitschrift "Der Monat"

Die 1948 im Auftrag der US-amerikanischen Militärregierung gegründete Zeitschrift Der Monat war ein intellektueller Brennspiegel der jungen Bundesrepublik, in dem die politischen Deutungskonflikte - mit Fokus auf den Nationalsozialismus, den Sowjetkommunismus und die Zukunft der westlichen Welt - ausgetragen wurden. Zu ihrem Renommee trug bei, dass sie zahlreiche prominente Autoren wie Hannah Arendt, Raymond Aron, Hans Kohn, Herbert Lüthy, George F. Kennan oder auch die Exkommunisten Arthur Koestler, George Orwell und Richard Löwenthal versammelte. Der Autor zeigt, welches Bild in der Zeitschrift vom nationalsozialistischen und sowjetkommunistischen Herrschaftssystem gezeichnet wurde und wie der Vergleich der beiden Diktaturen ausfiel. Dabei rekonstruiert er nicht nur den Einfluss der zeitgenössischen Totalitarismustheorien sowie die Imperative der US-amerikanischen Besatzungspolitik in Westdeutschland, sondern geht auch auf die CIA-Hintergründe des Periodikums ein. Eine Studie zu den Anfängen des Kalten Krieges, die angesichts der vielschichtigen Krise der westlichen Demokratien an Aktualität gewinnt

Totalitarismustheorien in der jungen BRD

Die 1948 im Auftrag der US-amerikanischen Militärregierung gegründete Zeitschrift Der Monat war ein intellektueller Brennspiegel der jungen Bundesrepublik, in dem die politischen Deutungskonflikte - mit Fokus auf den Nationalsozialismus, den Sowjetkommunismus und die Zukunft der westlichen Welt - ausgetragen wurden. Zu ihrem Renommee trug bei, dass sie zahlreiche prominente Autoren wie Hannah Arendt, Raymond Aron, Hans Kohn, Herbert Lüthy, George F. Kennan oder auch die Exkommunisten Arthur Koestler, George Orwell und Richard Löwenthal versammelte. Joachim Gmehling zeigt, welches Bild in der Zeitschrift vom nationalsozialistischen und sowjetkommunistischen Herrschaftssystem gezeichnet wurde und wie der Vergleich der beiden Diktaturen ausfiel. Dabei rekonstruiert er nicht nur den Einfluss der zeitgenössischen Totalitarismustheorien sowie die Imperative der US-amerikanischen Besatzungspolitik in Westdeutschland, sondern geht auch auf die CIA-Hintergründe des Periodikums ein. Eine Studie zu den Anfängen des Kalten Krieges, die angesichts der vielschichtigen Krise der westlichen Demokratien an Aktualität gewinnt

Calorimetric and acoustic study of binary mixtures containing an isomeric chlorobutane and butyl ethyl ether or methyl tert-butyl ether

Densities and speeds of sound in the temperature range 283.15-313.15 K have been measured for the binary mixtures formed by an isomeric chlorobutane (1-chlorobutane, 2-chlorobutane, 1-chloro-2-methylpropane, or 2-chloro-2-methylpropane) and butyl ethyl ether or methyl tert-butyl ether. Excess isentropic compressibilities were calculated from the experimental data. Excess enthalpies at T = 298.15 K are also included for the same binary mixtures. All these properties provide an insight into the nature of interactions operating on the present systems. Finally, the Prigogine-Flory-Patterson theory has been used to analyze the H E results and to estimate the isentropic compressibility values of the mixtures at T = 298.15 K

On-line estimation of biomass through pH control analysis in aerobic yeast fermentation systems

The amount of acid or base consumed in yeast cultures has been recently assigned to the pathway of nitrogen assimilation under respiratory conditions with no contribution by carbon metabolism (Castrillo et al., 1995). In this investigation, experiments under respirofermentative conditions have shown that production or consumption of ethanol does not contribute significantly to the specific rate of proton production (qH+), thus extending the previously obtained relationships for all aerobic conditions in which other major acid/base contributions are not involved. Tests in batch and chemostat culture confirm the validity of qH+ as a formal control parameter in aerobic fermentations.Junta Nacional de Investigação Científica e Tecnológica Gobierno Vasco (Departamento de Educación, Universidadese Investigación) Ministerio de Educación y Ciencia-Acciones Integrada

Integrating process design and control: An application of optimal control to chemical processes

In this paper, the optimal design of process systems generically used in chemical industries is studied. The closely coupled nature of optimal design specification of the equipment, the determination of the optimal process parameters in steady-state, moreover, some issues of the application of optimal control is shown. The solution of the overall optimization problem including (i) optimal design of the equipment and (ii) specification of its optimal control strategy can be found relying on two different design concepts, namely, on the conventionally used sequential or, on the newly emerged simultaneous design approaches. This paper gives the theoretical background of the ideas and presents a comparative summary of the approaches. The two approaches are contrasted to each other in which the effects of the interaction of optimal process design and optimal control is highlighted. A new simultaneous optimization procedure providing economic and operability benefits over the traditional stand-alone approach is proposed. The applicability of the idea is demonstrated by means of a design study carried out for optimal design of a coaxial heat exchanger and a reactive distillation column for the synthesis of ethyl tert butyl ether (ETBE), relying on the benefits of the utilization of optimal control

Practical residue curve map analysis applied to solvent recovery in non-ideal binary mixtures by batch distillation processes

Batch distillation inherent advantages has initiated recent search for process feasibility rules enabling the separation of azeotropic or difficult zeotropic binary mixtures thanks to the addition of an entrainer. A systematic procedure enabling to find suitable process and eventually suitable entrainer for the separation of zeotropic or azeotropic binary mixture is described. It brings together into practical use batch distillation process feasibility rules, chemical affinity insight and thermodynamic data analysis available in the literature. The procedure has been implemented in a wizard computer tool and is illustrated on the separation of the water – acetonitrile binary homoazeotrope. Through this tool, all possible 224 feasibility rules and 326 batch distillation sequence processes are checked systematically for each entrainer

Heterogeneous Extractive Batch Distillation of Chloroform - Methanol – Water : Feasibility and Experiments

A novel heterogeneous extractive distillation process is considered for separating the azeotropic mixture chloroform – methanol in a batch rectifying column, including for the first time an experimental validation of the process. Heterogeneous heavy entrainer water is selected inducing an unstable ternary heteroazeotrope and a saddle binary heteroazeotrope with chloroform (ternary diagram class 2.1-2b). Unlike to well-known heterogeneous azeotropic distillation process and thanks to continuous water feeding at the column top, the saddle binary heteroazeotrope chloroform – water is obtained at the column top, condensed and further split into the liquid – liquid decanter where the chloroform-rich phase is drawn as distillate. First, feasibility analysis is carried out by using a simplified differential model in the extractive section for determining the proper range of the entrainer flowrate and the reflux ratio. The operating conditions and reflux policy are validated by rigorous simulation with ProSim Batch Column® where technical features of a bench scale distillation column have been described. Six reproducible experiments are run in the bench scale column matching the simulated operating conditions with two sequentially increasing reflux ratio values. Simulation and experiments agree well. With an average molar purity higher than 99%, more than 85% of recovery yield was obtained for chloroform and methanol

Heterogeneous Batch Distillation Processes: Real System Optimisation

In this paper, optimisation of batch distillation processes is considered. It deals with real systems with rigorous simulation of the processes through the resolution full MESH differential algebraic equations. Specific software architecture is developed, based on the BatchColumn® simulator and on both SQP and GA numerical algorithms, and is able to optimise sequential batch columns as long as the column transitions are set. The efficiency of the proposed optimisation tool is illustrated by two case studies. The first one concerns heterogeneous batch solvent recovery in a single distillation column and shows that significant economical gains are obtained along with improved process conditions. Case two concerns the optimisation of two sequential homogeneous batch distillation columns and demonstrates the capacity to optimize several sequential dynamic different processes. For such multiobjective complex problems, GA is preferred to SQP that is able to improve specific GA solutions