cuvillier jun 2012 (42 résultats)

Taschenbuch. Etat : Neu. This item is printed on demand - it takes 3-4 days longer - Neuware -This publication examines Europe¿s strong dependency on importing essential minerals and metals for their industries and if a strategic European Union Sovereign Wealth Fund (EUSWF) is a possible solution for investing directly in producing countries in order to maximize the security of supply. This would be advanced measures for the ¿Raw Materials Initiative¿ (RMI) which has been launched by the European Commission in 2008 to react to the future development of minerals and metals which faced a scarcity based on natural limitation and increasing prices. Both are driven by a global shift from western economies to eastern economies based on booming economies and their high demand to satisfy the growth. The publication states that countries with a state capitalism have direct access to these relevant minerals and metals neither through their state-owned enterprises in their own economies nor through strategic foreign direct investments (FDI) in these elements by Sovereign Wealth Funds (SWFs) or state-owned enterprises, too. The results of the survey show that these economies are going to have or already have an advantage attributable to this behaviour and that the European Union (EU) missed this opportunity decades ago. Moreover does this way of political behaviour not coincide with the idea of a capitalist economic system, which is based on a free and fair trade. Finally, the EU seems to cooperate in this issue less than they should or might be able to. Indications were found related to the Europe 2020 strategy that the EU could overcome this weakness. 102 pp. Englisch.

Taschenbuch. Etat : Neu. This item is printed on demand - it takes 3-4 days longer - Neuware -In chemical biology, bioactive small molecules are applied to biological systems such as living cells for studying and manipulating biological processes.1 Such a small molecule-based approach for studying biology has several advantages over more classical research strategies such as genetic knock-out studies. The biological effect induced by small molecule modulation is usually rapid and can be spatially and temporally controlled. It is often reversible and conditional as small molecule application can be initiated at any developmental stage of the studied biological system. Moreover, the observed biological effect is tunable by varying the concentration of the small molecule probe. Finally, small molecule probes can be tagged with additional functionalities that allow to accumulate further information in biological experiments. For example, the proper attachment of fluorophores on a bioactive small molecule targeting a protein of interest generates a probe that can directly be employed in imaging applications. Besides these straightforward experimental advantages, small molecule interference has at least one additional conceptual advantage over genetic manipulations. While gene mutations act on the gene-level, small molecules modulate the function of the gene products. Consequently, small molecules interfere at a much more sophisticated and biologically relevant level; accordingly, they are in contrast to genetic studies able to differentiate between different protein forms that result from the same gene, e.g. by alternative splicings or post-translational modifications.Despite these huge advantages of small molecule manipulation of biological systems, the widespread use of chemical biology methods in biological research is limited by an inherent major disadvantage. In order to be feasible, such an approach requires the availability of suitable small molecules that induce a desired biological effect with high selectivity and potency. To date, only a limited number of proper small molecules for a restricted number of protein targets are though known. 186 pp. Englisch.

Taschenbuch. Etat : Neu. This item is printed on demand - it takes 3-4 days longer - Neuware -Solid dispersions are a promising approach for controlled release drug delivery systems as both the bioavailability enhancement of poorly water-soluble drugs as well as the sustained release of water-soluble drugs are possible to optimize their in vivo performance.Different methods for the manufacture of solid dispersion systems have been introduced in literature. In the present work, two methods are compared: hot-melt extrusion and ultrasound-assisted compaction technique. Various carrier systems and drugs with different physicochemical properties are applied to investigate the feasibility of the technologies for pharmaceutical formulation. The formulations are compared to the corresponding untreated physical blends of the components regarding their solid state structure and dissolution behavior to assess the effect of the manufacturing technique. 198 pp. Englisch.

Taschenbuch. Etat : Neu. This item is printed on demand - it takes 3-4 days longer - Neuware -This thesis considers the k-BALANCED PARTITIONING problem, which is defined as follows. Find the minimum number of edges in a graph that, when cut, partition the vertices into k (almost) equally sized sets. Amongst others, the problem derives its importance from the need to distribute data within a parallel-computing architecture. In this setting we are particularly interested in 2D finite element model (FEM) simulations. We therefore model the input as a regular quadrilateral tiling of the plane. More precisely, we focus on solid grid graphs. These are finite connected subgraphs of the infinite 2D grid without holes. However we also consider other graph classes. In particular, trees often give surprising conclusions to the problem on grid graphs. We provide several efficient algorithms computing provably good solutions. For the case when k=2 (the BISECTION problem) these include methods to compute optimal as well as approximate solutions. When k can take arbitrary values we provide two kinds of approximation algorithms. First we give a method that is fast but, for practical applications, has unsatisfactory approximation ratios. Additionally we provide an algorithm computing near-optimal solutions, which however is too slow to be used in practice. We also prove that the gained tradeoff between fast runtime and good approximation factors is unavoidable. For this we provide corresponding hardness results. 218 pp. Englisch.

Taschenbuch. Etat : Neu. This item is printed on demand - it takes 3-4 days longer - Neuware -Semidefinite Optimization has attracted the attention of many researchers over the last twenty years. It has nowadays a huge variety of applications in such different fields as Control, Structural Design, Statistics, or in the relaxation of hard combinatorial problems. In this thesis, we focus on the practical tractability of large-scale semidefinite optimization problems. From a theoretical point of view, these problems can be solved by polynomial-time Interior-Point methods approximately. The complexity estimate of Interior-Point methods grows logarithmically in the inverse of the solution accuracy, but with the order 3.5 in both the matrix size and the number of constraints. The later property prohibits the resolution of large-scale problems in practice.In this thesis, we present new approaches based on advanced First-Order methods such as Smoothing Techniques and Mirror-Prox algorithms for solving structured large-scale semidefinite optimization problems up to a moderate accuracy. These methods require a very specific problem format. However, generic semidefinite optimization problems do not comply with these requirements. In a preliminary step, we recast slightly structured semidefinite optimization problems in an alternative form to which these methods are applicable, namely as matrix saddle-point problems. The final methods have a complexity result that depends linearly in both the number of constraints and the inverse of the target accuracy.Smoothing Techniques constitute a two-stage procedure: we derive a smooth approximation of the objective function at first and apply an optimal First-Order method to the adapted problem afterwards. We present a refined version of this optimal First-Order method in this thesis. The worst-case complexity result for this modified scheme is of the same order as for the original method. However, numerical results show that this alternative scheme needs much less iterations than its original counterpart to find an approximate solution in practice. Using this refined version of the optimal First-Order method in Smoothing Techniques, we are able to solve randomly generated matrix saddle-point problems involving a hundred matrices of size 12'800 x 12'800 up to an absolute accuracy of 0.0012 in about four hours.Smoothing Techniques and Mirror-Prox methods require the computation of one or two matrix exponentials at every iteration when applied to the matrix saddle-point problems obtained from the above transformation step. Using standard techniques, the efficiency estimate for the exponentiation of a symmetric matrix grows cubically in the size of the matrix. Clearly, this operation limits the class of problems that can be solved by Smoothing Techniques and Mirror-Prox methods in practice. We present a randomized Mirror-Prox method where we replace the exact matrix exponential by a stochastic approximation. This randomized method outperforms all its competitors with respect to the theoretical complexity estimate on a significant class of large-scale matrix saddle-point problems. Furthermore, we show numerical results where the randomized method needs only about 58% of the CPU time of the deterministic counterpart for solving approximately randomly generated matrix saddle-point problems with a hundred matrices of size 800 × 800.As a side result of this thesis, we show that the Hedge algorithm - a method that is heavily used in Theoretical Computer Science - can be interpreted as a Dual Averaging scheme. The embedding of the Hedge algorithm in the framework of Dual Averaging schemes allows us to derive three new versions of this algorithm. The efficiency guarantees of these modified Hedge algorithms are at least as good as, sometimes even better than, the complexity estimates of the original method. We present numerical experiments where the refined methods significantly outperform their vanilla counterpart. 204 pp. Englisch.

Taschenbuch. Etat : Neu. This item is printed on demand - it takes 3-4 days longer - Neuware -One approach to detect gravitational waves, which have been postulated by Albert Einstein in his General Theory of Relativity, is based on interferometric measurements oflength variations with a large-scale Michelson interferometer. The detection range of these ground-based observatories is currently limited to approx. 15 Megaparsec (Mpc) because of a reduced sensitivity at detection frequencies of 10 Hz ¿ 10 kHz by shot noise. These limitations can be overcome by an output power increase of the detector¿s light source, which will enhance the sensitivity by an order of magnitude. Thus, the possibility of detecting a gravitational wave will be raised by a factor of 1000 and the detection range will be increased to 150 Mpc, accordingly. In this work a laser systems is presented, which fulfills the free-running laser requirements on stability and beam quality required by the next generation of gravitational wave detectors for the first time. The developed laser system is based on a two-stage concept, supplemented with an active amplitude and frequency stabilization, which is not part of this work. A 35 W Nd:YVO4 amplifier system with an emission wavelength of 1064 nm represents the frequency reference of the laser system and is used as the seed for an injection-locked high power oscillator. This amplifier, which is based on a Master Oscillator Power Amplifier scheme, is already used in today¿s gravitational wave detectors and has been proven to be reliable in long-term operation. The linearly polarized output power of more than 200 W is generated inside the oscillator stage, which consists of four Nd:YAG crystals arranged in an asymmetric ring resonator configuration. To compensate for losses due to thermal birefringence inside the longitudinally pumped laser crystals, an imaging depolarization compensation is used. 188 pp. Englisch.

Taschenbuch. Etat : Neu. This item is printed on demand - it takes 3-4 days longer - Neuware -Particularly in the upper stage development of rockets (launchers), gravity dominated fluid motion in upper stage tanks (sloshing) during flight represents an undesired dynamic effect. On the one hand the sloshing forces lead to disturbances, which have to be compensated by the reaction control system. On the other hand, when cryogenic fluids are considered, the fluctuations in tank pressure may be critical under some circumstances compromising the structural stability of the tank. In this field, the utilization of cryogenic propellants represents a high challenge to layout and design of the propulsion components including the propellant tanks.This work deals with two effects that are directly coupled to the sloshing content inside the propellant tank. To investigate these effects a dedicated test setup has been developed. At first, the damping characteristics of sloshing cryogenic nitrogen - which is used as a substitute for the rocket propellants liquid hydrogen and liquid oxygen - are determined. The results are correlated to the theory based on storable propellants. The main part of this work is linked to a characteristic pressure drop inside the propellant tank caused by the sloshing liquid. For the effect to occur, the tank must be pressurized to enable the formation of a thermal stratification below the liquid surface. Sloshing leads to the mixing of liquid in this region with subcooled liquid from the bulk. This affects the decrease of the temperature at the free surface leading to the condensation of superheated vapor. Thus, the pressure in the tank must decreases. Three different pressurization concepts are introduced in this work; self-pressurization where the tank is pressurized by evaporating liquid caused by the heat flowing into the tank. Furthermore, the tank is pressurized with gaseous nitrogen taken from an external gas bottle and at last gaseous helium from an external supply is used for pressurization purpose. By the application of helium as non-condensable gas, a significant reduction of the pressure drop is expected. The experimental results confirm this working hypothesis and therefore support the theoretical considerations described by an approach of Das & Hopfinger.All results are presented in a non-dimensional form to allow the comparison to data from the literature. Furthermore, the upscaling of the current results enables the prediction for future cryogenic upper stages such as the ESC-B for the European space launcher Ariane 5. 212 pp. Englisch.

Taschenbuch. Etat : Neu. This item is printed on demand - it takes 3-4 days longer - Neuware -The production, secretion and purification of recombinant proteins in eukaryotic as well as prokaryotic systems are major topics of industrial biotechnology. During the first application period (2001-2004) microbial expression systems for the filamentous nonpathogenic fungi Aspergillus niger as well for the Gram positive bacterium Bacillus megaterium were established. It has an efficient secretion systems which makes it applied in industrial production processes. The proteins produced by this organism possess posttranslational modifications. B. megaterium is nonpathogenic and able to metabolize numerous carbon sources. Further, it shows a great potential for protein secretion and, important for recombinant protein production, has a stable plasmid replication system. The major goal of the first funding period of SFB 578, the establishment of a system for the secretion of the recombinant proteins, which included different homologous and heterologous glycosyltransferases into the growth medium was reached. During the second funding period (2004-2008) the expression systems for both organisms were further enhanced. This included the integration of different small affinity tags for purification of the intra- as well the extracellular produced recombinant proteins. Proteins could now be easily purified and used for different activity tests. Here, new glycosyltransferases recombinantly overproduced in A. niger and B. megaterium were characterized, respectively [Homann et al., 2009, Zuccaro et al., 2008]. New promoters and leader peptides were identified by secretome analysis for both hosts. These promoters could be induced using simple cheap carbon sources. For B. megaterium a further promoter system based on a two vector system was developed. With this phage dependent system it was possible to produce recombinant proteins intracellularly. 274 pp. Englisch.

Taschenbuch. Etat : Neu. This item is printed on demand - it takes 3-4 days longer - Neuware -Petroleum is a natural resource that has contributed immensely to the industrial and economic developments of many nations. It has simultaneously contributed to the ruin of such nations. While industrial activities of nations endowed with petroleum resources increased, the national technological advancement of such nations has not been significant. The discovery and exploration of petroleum has diverted focus on (Agricultural Produciton) and other sectors of national economy. The serious negative effects of the exploration of petroleum on the agrarian economy of Nigeria, as a case in Africa, are very sad. The agriculture sector which used to be the main stake of the economy of Nigeria in the pre and early independent periods, until the 1980s, was destroyed as a result of the discovery and exploration of petroleum. While Nigeria should celebrate the exploration of petroleum and properly manage the resource, this volatile petroleum resource should not be allowed to destroy the agricultural and other viable sectors of the national economy. The paper presents some viable agro-based alternatives to petroleum economy. The industries and programs that can emerge from the output of the agriculture sector are many. These include energy industry from bio Fuel and bio diesel, solar and wind; pharmaceutical industry from fruits and vegetables; tourism industry from wild life parks and forest resources; furniture and construction industries from forest resources; agro processing industry from arable and cash crops; leather industry from animal skin; textile industry from cotton; agro machinery manufacturing industry to serve agro based industries; product development and added value; and women and youth empowerment through agricultural clusters. 440 pp. Englisch.

Taschenbuch. Etat : Neu. This item is printed on demand - Print on Demand Titel. Neuware -This publication examines Europe¿s strong dependency on importing essential minerals and metals for their industries and if a strategic European Union Sovereign Wealth Fund (EUSWF) is a possible solution for investing directly in producing countries in order to maximize the security of supply. This would be advanced measures for the ¿Raw Materials Initiative¿ (RMI) which has been launched by the European Commission in 2008 to react to the future development of minerals and metals which faced a scarcity based on natural limitation and increasing prices. Both are driven by a global shift from western economies to eastern economies based on booming economies and their high demand to satisfy the growth. The publication states that countries with a state capitalism have direct access to these relevant minerals and metals neither through their state-owned enterprises in their own economies nor through strategic foreign direct investments (FDI) in these elements by Sovereign Wealth Funds (SWFs) or state-owned enterprises, too. The results of the survey show that these economies are going to have or already have an advantage attributable to this behaviour and that the European Union (EU) missed this opportunity decades ago. Moreover does this way of political behaviour not coincide with the idea of a capitalist economic system, which is based on a free and fair trade. Finally, the EU seems to cooperate in this issue less than they should or might be able to. Indications were found related to the Europe 2020 strategy that the EU could overcome this weakness.Cuvillier Verlag, Nonnenstieg 8, 37075 Göttingen 102 pp. Englisch.

Taschenbuch. Etat : Neu. This item is printed on demand - it takes 3-4 days longer - Neuware -Die E.ON Avacon sieht sich als regionaler Verteilnetzbetreiber im besonderen Maße mit dem Ausbau der regenerativen Energiequellen konfrontiert. Neben dem enormen Ausbau der Nutzung der Windenergie in den vergangenen zwei Jahrzehnten, welche vornehmlich die Mittel- und Hochspannungsnetze betroffen hat, ist in der näheren Vergangenheit ein rasantes Wachstum auf dem Gebiet der Fotovoltaik zu beobachten. Diese Anlagen werden zu einem großen Teil in den Niederspannungsnetzen (NS-Netzen) angeschlossen und stellen den Netzbetreiber vor eine völlig geänderte Netzaufgabe, welche vielfach zu einem erheblichen Netzausbaubedarf führt. Die sich ergebenden Effekte werden durch die zusätzliche Einbindung von Mikro- und Mini-Blockheizkraftwerden in die Verteilnetze weiter verstärkt. Dieser neuen Aufgabenstellung begegnet die E.ON Avacon (EAV) zum Einen durch klassischen Netzausbau, zum Anderen aber auch durch die Erprobung und den zukünftigen Einsatz innovativer Technologien. Hierzu zählt auch der Einsatz des neuen Betriebsmittel ¿regelbarer Ortsnetztransformator¿ (rONT). Für dieses Betriebsmittel liegen weder Betriebserfahrungen noch ein genaues Lastenheft vor. Aus diesem Grund führt die EAV einen Feldversuch zum Sammeln praktischer Erfahrungen in ihren Netzgebiet durch und beauftragt weiterhin das Energie-Forschungszentrum Niedersachsen (EFZN) zur Durchführung dieser Orientierungsstudie. Ziel dieser Studie ist es, erste theoretische Erkenntnisse bezüglich des neuen Betriebsmittels rONT zu gewinnen, prinzipielle Anforderungen an einen späteren Serientyp zu definieren und potenziell auftretende Spannungsfelder sowie notwendige wissenschaftliche Vertiefungen aufzuzeigen. 100 pp. Deutsch.

Taschenbuch. Etat : Neu. This item is printed on demand - it takes 3-4 days longer - Neuware -Das Jahrbuch 3 widmet sich der technischen Forschung und Entwicklung im audiovisuellen Bereich gleich mit drei Beiträgen, während zwei Artikel aus der kontextualisierenden Forschung sowie einer aus dem Bereich bedrohter Kulturen das Bild im Sinne von Synergien zwischen audiovisueller Dokumentation im Feld und Archivierung abrunden. Somit zeigt sich die Bedeutung des Phonogrammarchivs als wissenschaftliches audiovisuelles Archiv und Forschungsinstitut an der Österreichischen Akademie der Wissenschaften in seiner Schlüsselrolle hinsichtlich neuer wissenschaftlicher Ansätze und Erkenntnisse. Am Beispiel der Digitalisierung einer sehr frühen Tonbandsammlung aus Portugal wird die Kompetenz des Phonogrammarchivs beim Re-recording historischer Tonträger deutlich (N. Wallaszkovits). Die netzbasierte Bereitstellung von Archivinhalten, Metadaten und auch ausgewählten Hörbeispielen ist eine der großen Herausforderungen des 21. Jahrhunderts. Im Beitrag von J. Spitzbart geht es um besondere technische Probleme ¿ wie der Übertragung der Metadaten, der Such- und Sortiermöglichkeiten und der Anpassung der unterschiedlichen Katalogfelder in das Webportal ¿ sowie um ethische und moralische Bedenken bzw. urheberrechtliche Fragen. Vor zehn Jahren wurde begonnen, auch wissenschaftliches Videomaterial zu archivieren. Ein Rückblick auf die Entwicklung der Videographie im Phonogrammarchiv (F. Pavuza) zeigt, wie technische Vorgaben und individuelle Bedürfnisse abgestimmt werden mussten, woraus sich auch Strategien für die Zukunft ergeben. 126 pp. Deutsch.

Taschenbuch. Etat : Neu. This item is printed on demand - it takes 3-4 days longer - Neuware -In dieser Arbeit werden zwei Bereiche der Photochemie von Hauptgruppenelement-Verbindungen betrachtet:Im ersten Teil der Arbeit wird die photochemische Reduktion von Hauptgruppen-Halogenid-Verbindungen zum entsprechenden Element als neue Synthesestrategie für Nanopartikel eingeführt. Diese Flüssigphasen-Synthese erlaubt unter Verwendung von kommerziellerhältlichen und günstigen Edukten einen einfachen Zugang zu Partikeln aus schweren Hauptgruppenelementen oder ihren Verbindungen. Untersucht wurden unter anderem die Gestalt und Größenverteilung der erhaltenen Partikel, der Einfluss von Stabilisatoren auf diese Eigenschaften, sowie der zugrundeliegende Reaktionsmechanismus.Im zweiten Teil der Arbeit wurde die Eignung von Bismutoxidhalogenide als p-Halbleiter für eine Farbstoffsolarzelle überprüft. Dazu wurde eine Synthese für nanoskaliges Bismutoxidchlorid, bromid und iodid entwickelt, die auf einem Phasentransfer aus einer polaren in eine unpolare Phase basiert. Es wird eine eingehende Charakterisierung der Materialien und eine Methode zur Modifizierung ihrer Oberfläche präsentiert. Aus diesen Materialien wurden schließlich Farbstoffsolarzellen gebaut und ihr Verhalten in simulierten Sonnenlicht AM1,5 untersucht, was einen Vergleich der Bismutoxidhalogenide mit dem Referenzmaterial Nickeloxid ermöglicht. 128 pp. Deutsch.

Taschenbuch. Etat : Neu. This item is printed on demand - Print on Demand Titel. Neuware -Solid dispersions are a promising approach for controlled release drug delivery systems as both the bioavailability enhancement of poorly water-soluble drugs as well as the sustained release of water-soluble drugs are possible to optimize their in vivo performance.Different methods for the manufacture of solid dispersion systems have been introduced in literature. In the present work, two methods are compared: hot-melt extrusion and ultrasound-assisted compaction technique. Various carrier systems and drugs with different physicochemical properties are applied to investigate the feasibility of the technologies for pharmaceutical formulation. The formulations are compared to the corresponding untreated physical blends of the components regarding their solid state structure and dissolution behavior to assess the effect of the manufacturing technique.Cuvillier Verlag, Nonnenstieg 8, 37075 Göttingen 198 pp. Englisch.

Taschenbuch. Etat : Neu. This item is printed on demand - Print on Demand Titel. Neuware -In chemical biology, bioactive small molecules are applied to biological systems such as living cells for studying and manipulating biological processes.1 Such a small molecule-based approach for studying biology has several advantages over more classical research strategies such as genetic knock-out studies. The biological effect induced by small molecule modulation is usually rapid and can be spatially and temporally controlled. It is often reversible and conditional as small molecule application can be initiated at any developmental stage of the studied biological system. Moreover, the observed biological effect is tunable by varying the concentration of the small molecule probe. Finally, small molecule probes can be tagged with additional functionalities that allow to accumulate further information in biological experiments. For example, the proper attachment of fluorophores on a bioactive small molecule targeting a protein of interest generates a probe that can directly be employed in imaging applications. Besides these straightforward experimental advantages, small molecule interference has at least one additional conceptual advantage over genetic manipulations. While gene mutations act on the gene-level, small molecules modulate the function of the gene products. Consequently, small molecules interfere at a much more sophisticated and biologically relevant level; accordingly, they are in contrast to genetic studies able to differentiate between different protein forms that result from the same gene, e.g. by alternative splicings or post-translational modifications.Despite these huge advantages of small molecule manipulation of biological systems, the widespread use of chemical biology methods in biological research is limited by an inherent major disadvantage. In order to be feasible, such an approach requires the availability of suitable small molecules that induce a desired biological effect with high selectivity and potency. To date, only a limited number of proper small molecules for a restricted number of protein targets are though known. 186 pp. Englisch.

Taschenbuch. Etat : Neu. This item is printed on demand - Print on Demand Titel. Neuware -Semidefinite Optimization has attracted the attention of many researchers over the last twenty years. It has nowadays a huge variety of applications in such different fields as Control, Structural Design, Statistics, or in the relaxation of hard combinatorial problems. In this thesis, we focus on the practical tractability of large-scale semidefinite optimization problems. From a theoretical point of view, these problems can be solved by polynomial-time Interior-Point methods approximately. The complexity estimate of Interior-Point methods grows logarithmically in the inverse of the solution accuracy, but with the order 3.5 in both the matrix size and the number of constraints. The later property prohibits the resolution of large-scale problems in practice.In this thesis, we present new approaches based on advanced First-Order methods such as Smoothing Techniques and Mirror-Prox algorithms for solving structured large-scale semidefinite optimization problems up to a moderate accuracy. These methods require a very specific problem format. However, generic semidefinite optimization problems do not comply with these requirements. In a preliminary step, we recast slightly structured semidefinite optimization problems in an alternative form to which these methods are applicable, namely as matrix saddle-point problems. The final methods have a complexity result that depends linearly in both the number of constraints and the inverse of the target accuracy.Smoothing Techniques constitute a two-stage procedure: we derive a smooth approximation of the objective function at first and apply an optimal First-Order method to the adapted problem afterwards. We present a refined version of this optimal First-Order method in this thesis. The worst-case complexity result for this modified scheme is of the same order as for the original method. However, numerical results show that this alternative scheme needs much less iterations than its original counterpart to find an approximate solution in practice. Using this refined version of the optimal First-Order method in Smoothing Techniques, we are able to solve randomly generated matrix saddle-point problems involving a hundred matrices of size 12¿800 x 12¿800 up to an absolute accuracy of 0.0012 in about four hours.Smoothing Techniques and Mirror-Prox methods require the computation of one or two matrix exponentials at every iteration when applied to the matrix saddle-point problems obtained from the above transformation step. Using standard techniques, the efficiency estimate for the exponentiation of a symmetric matrix grows cubically in the size of the matrix. Clearly, this operation limits the class of problems that can be solved by Smoothing Techniques and Mirror-Prox methods in practice. We present a randomized Mirror-Prox method where we replace the exact matrix exponential by a stochastic approximation. This randomized method outperforms all its competitors with respect to the theoretical complexity estimate on a significant class of large-scale matrix saddle-point problems. Furthermore, we show numerical results where the randomized method needs only about 58% of the CPU time of the deterministic counterpart for solving approximately randomly generated matrix saddle-point problems with a hundred matrices of size 800 × 800.As a side result of this thesis, we show that the Hedge algorithm ¿ a method that is heavily used in Theoretical Computer Science ¿ can be interpreted as a Dual Averaging scheme. The embedding of the Hedge algorithm in the framework of Dual Averaging schemes allows us to derive three new versions of this algorithm. The efficiency guarantees of these modified Hedge algorithms are at least as good as, sometimes even better than, the complexity estimates of the original method. We present numerical experiments where the refined methods significantly outperform their vanilla counterpart.Cuvillier Verlag, Nonne.

Taschenbuch. Etat : Neu. This item is printed on demand - Print on Demand Titel. Neuware -This thesis considers the k-BALANCED PARTITIONING problem, which is defined as follows. Find the minimum number of edges in a graph that, when cut, partition the vertices into k (almost) equally sized sets. Amongst others, the problem derives its importance from the need to distribute data within a parallel-computing architecture. In this setting we are particularly interested in 2D finite element model (FEM) simulations. We therefore model the input as a regular quadrilateral tiling of the plane. More precisely, we focus on solid grid graphs. These are finite connected subgraphs of the infinite 2D grid without holes. However we also consider other graph classes. In particular, trees often give surprising conclusions to the problem on grid graphs.We provide several efficient algorithms computing provably good solutions. For the case when k=2 (the BISECTION problem) these include methods to compute optimal as well as approximate solutions. When k can take arbitrary values we provide two kinds of approximation algorithms. First we give a method that is fast but, for practical applications, has unsatisfactory approximation ratios. Additionally we provide an algorithm computing near-optimal solutions, which however is too slow to be used in practice. We also prove that the gained tradeoff between fast runtime and good approximation factors is unavoidable. For this we provide corresponding hardness results.Cuvillier Verlag, Nonnenstieg 8, 37075 Göttingen 218 pp. Englisch.

Taschenbuch. Etat : Neu. This item is printed on demand - Print on Demand Titel. Neuware -One approach to detect gravitational waves, which have been postulated by Albert Einstein in his General Theory of Relativity, is based on interferometric measurements oflength variations with a large-scale Michelson interferometer. The detection range of theseground-based observatories is currently limited to approx. 15 Megaparsec (Mpc) becauseof a reduced sensitivity at detection frequencies of 10 Hz - 10 kHz by shot noise. Theselimitations can be overcome by an output power increase of the detector's light sourcewhich will enhance the sensitivity by an order of magnitude. Thus, the possibility of detecting a gravitational wave will be raised by a factor of 1000 and the detection range will be increased to 150 Mpc, accordingly.In this work a laser systems is presented, which fulfills the free-running laser requirementson stability and beam quality required by the next generation of gravitational wave detectors for the first time. The developed laser system is based on a two-stage conceptsupplemented with an active amplitude and frequency stabilization, which is not partof this work. A 35 W Nd:YVO4 amplifier system with an emission wavelength of 1064nm represents the frequency reference of the laser system and is used as the seed for aninjection-locked high power oscillator. This amplifier, which is based on a Master OscillatorPower Amplifier scheme, is already used in today's gravitational wave detectors and hasbeen proven to be reliable in long-term operation. The linearly polarized output power ofmore than 200 W is generated inside the oscillator stage, which consists of four Nd:YAGcrystals arranged in an asymmetric ring resonator configuration. To compensate for lossesdue to thermal birefringence inside the longitudinally pumped laser crystals, an imagingdepolarization compensation is used.Cuvillier Verlag, Nonnenstieg 8, 37075 Göttingen 188 pp. Englisch.

Taschenbuch. Etat : Neu. This item is printed on demand - Print on Demand Titel. Neuware -Particularly in the upper stage development of rockets (launchers), gravity dominated fluid motion in upper stage tanks (sloshing) during flight represents an undesired dynamic effect. On the one hand the sloshing forces lead to disturbances, which have to be compensated by the reaction control system. On the other hand, when cryogenic fluids are considered, the fluctuations in tank pressure may be critical under some circumstances compromising the structural stability of the tank. In this field, the utilization of cryogenic propellants represents a high challenge to layout and design of the propulsion components including the propellant tanks.This work deals with two effects that are directly coupled to the sloshing content inside the propellant tank. To investigate these effects a dedicated test setup has been developed. At first, the damping characteristics of sloshing cryogenic nitrogen ¿ which is used as a substitute for the rocket propellants liquid hydrogen and liquid oxygen ¿ are determined. The results are correlated to the theory based on storable propellants. The main part of this work is linked to a characteristic pressure drop inside the propellant tank caused by the sloshing liquid. For the effect to occur, the tank must be pressurized to enable the formation of a thermal stratification below the liquid surface. Sloshing leads to the mixing of liquid in this region with subcooled liquid from the bulk. This affects the decrease of the temperature at the free surface leading to the condensation of superheated vapor. Thus, the pressure in the tank must decreases. Three different pressurization concepts are introduced in this work; self-pressurization where the tank is pressurized by evaporating liquid caused by the heat flowing into the tank. Furthermore, the tank is pressurized with gaseous nitrogen taken from an external gas bottle and at last gaseous helium from an external supply is used for pressurization purpose. By the application of helium as non-condensable gas, a significant reduction of the pressure drop is expected. The experimental results confirm this working hypothesis and therefore support the theoretical considerations described by an approach of Das & Hopfinger.All results are presented in a non-dimensional form to allow the comparison to data from the literature. Furthermore, the upscaling of the current results enables the prediction for future cryogenic upper stages such as the ESC-B for the European space launcher Ariane 5.Cuvillier Verlag, Nonnenstieg 8, 37075 Göttingen 212 pp. Englisch.

Taschenbuch. Etat : Neu. This item is printed on demand - it takes 3-4 days longer - Neuware -Der weltweite Bedarf an Energie, Rohstoffen und Produktionsgütern ist in den letzten Jahren kontinuierlich angestiegen. Um die vielfaltigen Herausforderungen, wie die Erschöpfung von Rohstoffquellen, die fortschreitende Umweltbelastung und die globale Klimaveränderung meistern zu können, kommt der Entwicklung und Verbesserung von modernen Werkstoffen und Herstellungsprozessen eine entscheidende Rolle zu. Ein erhebliches Potential bieten vor allem die keramischen Werkstoffe [1]. Keramiken werden bereits seit Jahrtausenden beispielsweise als Geschirr, Brennhilfsmittel und Ofenauskleidungen eingesetzt. Bis heute hat sich das Einsatzspektrum keramischer Werkstoffe durch die konsequente Verbesserung ihrer Eigenschaften deutlich erweitert, so dass ihnen in manchen Einsatzgebieten (z.B. Luft- und Raumfahrt) sogar eine Schlüsselrolle bei aktuellen und künftigen Entwicklungen zuteil wird [2]. Keramiken sind anorganische, nichtmetallische und überwiegend polykristalline Materialien, die bei Raumtemperatur aus einer Rohmasse geformt werden und ihre typischen Werkstoffeigenschaften durch eine Temperaturbehandlung (Sintern) erhalten [1]. Sie basieren meist auf ionischen oder kovalenten Verbindungen, die man nach ihrem Sauerstoffgehalt in oxidische oder nichtoxidische (Nitride, Karbide, Boride,S) Werkstoffe unterteilt. Im angelsächsischen Raum umfasst der Begriff 'ceramics' aber auch amorphe, anorganische Werkstoffe, wie Glas, Glaskeramik, Emaille, Baustoffe und Bindemittel (Zement, Kalk, Gips,.). Je nachdem, welche besonderen Eigenschaften die wesentliche Motivation fur den Einsatz der keramischen Komponenten darstellt, untergliedert man sie außerdem in Strukturkeramiken (mechanische, thermische und tribologische Eigenschaften), Funktionskeramiken (z.B. elektrische/thermische Leitfähigkeit,.) oder Biokeramiken (v.a. Körperverträglichkeit, Resorbierbarkeit). 166 pp. Deutsch.

Taschenbuch. Etat : Neu. This item is printed on demand - Print on Demand Titel. Neuware -The production, secretion and purification of recombinant proteins in eukaryotic as well as prokaryotic systems are major topics of industrial biotechnology. During the first application period (2001-2004) microbial expression systems for the filamentous nonpathogenic fungi Aspergillus niger as well for the Gram positive bacterium Bacillus megaterium were established. It has an efficient secretion systems which makes it applied in industrial production processes. The proteins produced by this organism possess posttranslational modifications. B. megaterium is nonpathogenic and able to metabolize numerous carbon sources. Further, it shows a great potential for protein secretion and, important for recombinant protein production, has a stable plasmid replication system. The major goal of the first funding period of SFB 578, the establishment of a system for the secretion of the recombinant proteins, which included different homologous and heterologous glycosyltransferases into the growth medium was reached. During the second funding period (2004-2008) the expression systems for both organisms were further enhanced. This included the integration of different small affinity tags for purification of the intra- as well the extracellular produced recombinant proteins. Proteins could now be easily purified and used for different activity tests. Here, new glycosyltransferases recombinantly overproduced in A. niger and B. megaterium were characterized, respectively [Homann et al., 2009, Zuccaro et al., 2008]. New promoters and leader peptides were identified by secretome analysis for both hosts. These promoters could be induced using simple cheap carbon sources. For B. megaterium a further promoter system based on a two vector system was developed. With this phage dependent system it was possible to produce recombinant proteins intracellularly.Cuvillier Verlag, Nonnenstieg 8, 37075 Göttingen 274 pp. Englisch.

Taschenbuch. Etat : Neu. This item is printed on demand - Print on Demand Titel. Neuware -Petroleum is a natural resource that has contributed immensely to the industrial and economic developments of many nations. It has simultaneously contributed to the ruin of such nations. While industrial activities of nations endowed with petroleum resources increased, the national technological advancement of such nations has not been significant. The discovery and exploration of petroleum has diverted focus on (Agricultural Produciton) and other sectors of national economy. The serious negative effects of the exploration of petroleum on the agrarian economy of Nigeria, as a case in Africa, are very sad. The agriculture sector which used to be the main stake of the economy of Nigeria in the pre and early independent periods, until the 1980s, was destroyed as a result of the discovery and exploration of petroleum. While Nigeria should celebrate the exploration of petroleum and properly manage the resource, this volatile petroleum resource should not be allowed to destroy the agricultural and other viable sectors of the national economy. The paper presents some viable agro-based alternatives to petroleum economy. The industries and programs that can emerge from the output of the agriculture sector are many. These include energy industry from bio Fuel and bio diesel, solar and wind; pharmaceutical industry from fruits and vegetables; tourism industry from wild life parks and forest resources; furniture and construction industries from forest resources; agro processing industry from arable and cash crops; leather industry from animal skin; textile industry from cotton; agro machinery manufacturing industry to serve agro based industries; product development and added value; and women and youth empowerment through agricultural clusters.Cuvillier Verlag, Nonnenstieg 8, 37075 Göttingen 440 pp. Englisch.

Taschenbuch. Etat : Neu. This item is printed on demand - it takes 3-4 days longer - Neuware -In our modern world advanced magnetic materials with excellent magnetic properties are getting more and more important. Major areas needed to be mentioned here are for example high performance permanent magnets for electric motors or magnetic data storage media. Further development of existing products or even new applications can only be possible with a continuous optimization of intrinsic and extrinsic material parameters of magnetic materials.Looking at the temporal development of magnetic data storage devices, it is characterized by a continuous increase of the data storage density, what can be achieved by smaller bit sizes. For continuing this trend and realizing storage densities of 1 TBit/in bit sizes are needed, which reach their physical limits. Since current magnetic storage media consist of a granular layer and one bit consists of a various number of grains, with the ongoing miniaturization of the bits the bit boundary is getting more and more blurred. This issue can be postponed by the usage of ever smaller grains. An alternative route to optimize the signal to noise ratio is the usage of bit patterned media, where each dot represents a single bit. Depending on the magnetic material used, however, a minimal grain size is given, since the magnetization will become thermally unstable if the grains are too small. This phenomenon is known as the superparamagnetic limit. Hence, for future magnetic storage media a material is needed having an extremely high crystalline anisotropy and hence circumventing this superparamagnetic limit. 190 pp. Deutsch.

Taschenbuch. Etat : Neu. This item is printed on demand - it takes 3-4 days longer - Neuware -Die moderne Reaktions- und Trenntechnik in der chemischen Industrie ist eine Hochtechnologie. Die dort eingesetzten Verfahren zur Reaktionsführung und Auftrennung der Produkte sind weitestgehend optimiert. Zu diesem Stand hat die instrumentelle Analytik ¿ speziell die Prozeßanalytik ¿ wesentlich beigetragen. Das Reaktions- und Prozeßmonitoring ist eine wichtige Hilfe zum Verständnis der komplexen Zusammenhänge.In der vorliegenden Arbeit wird der Einsatz der NMR-Spektroskopie in verfahrenstechnischen Anwendungen wie dem Reaktions- und Prozeß-Monitoring diskutiert und alle dazu notwendigen Grundlagen erläutert. Solche Anwendungen erfordern häufig Techniken, mit denen hochaufgelöste Spektren zerstörungsfrei aufgenommen werden können, oft bei erhöhtem Druck und erhöhter Temperatur. Neben der quantitativen Bestimmung der Zusammensetzung komplexer reagierender Mischungen besteht gleichzeitig die Möglichkeit zur Identifikation von Nebenprodukten. 214 pp. Deutsch.

Taschenbuch. Etat : Neu. This item is printed on demand - it takes 3-4 days longer - Neuware -In Deutschland wurde im Jahr 2011 ca. 6 Millionen Tonnen Raps produziert. Die stete Steigerung der Produktion ist auf die Verwertung des Rapsöls als Biodiesel zurückzuführen. ¿ der Rapsölproduktion wurde einzig zur Produktion des benötigten Biodiesels verwendet[1].Der Welthungerindex WHI zeigt die jährliche Entwicklung der Ernährungssituation der Weltbevölkerung. 14% der Weltbevölkerung sind chronisch oder akut unterernährt. Jedes Jahr sterben 5.5 Million Kinder an den Folgen ihrer Unterernährung[2]. Somit ist eine Ertragssteigerung in der modernen Landwirtschaft von essentieller Bedeutung. Um dies zu erreichen, werden immer neue Pflanzenschutzmittel benötigt, weil immer mehr Schadorganismen Resistenzen gegenüber Pflanzenschutzmitteln entwickeln. So stellen Pilze, Unkräuter und Insekten neben den Wettereinflüssen die größte Bedrohung für die Ernteerträge dar. Nicht selten dienen Naturstoffe, welche aus Mikroorganismen, Pflanzen und Pilzen isoliert werden, als Leitstrukturen in der Arzneimittelentwicklung oder dem Pflanzenschutz. Wegen der zumeist nur geringen Verfügbarkeit an isoliertem Material ist die organische Synthese ein unumgängliches Werkzeug für die Bereitstellung von Naturstoffen. Von besonders großem Interesse ist bei der Entwicklung neuer Methoden die Effizienz, Ökonomie und Ökologie. Einen wichtigen Beitrag dazu liefert die moderne Katalysechemie, insbesondere die Palladium-katalysierten C-CBindungsknüpfungen. Die Heck-Reaktion ist nur eine der vielen nützlichen Palladiumkatalysierten Reaktionen. 256 pp. Deutsch.

Taschenbuch. Etat : Neu. This item is printed on demand - it takes 3-4 days longer - Neuware -Wer sich mit dem Thema der Steuerschätzung befasst, wird an den Anfang der Weihnachtsgeschichte denken: ¿Es begab sich aber zu der Zeit, daß ein Gebot von dem Kaiser Augustus ausging, daß alle Welt geschätzt würde. (¿)¿1 Keine Bearbeitung des Themas der Schätzung nach 162 AO kommt wohl ohne dieses Zitat aus. Zeigt es doch, dass es sich bei der Schätzung nicht um eine Thematik handelt, die erst in jüngster Zeit Fragen aufwirft, sondern bereits seit langem ein Problem der Besteuerung ist. Die vorliegende Bearbeitung soll die Schätzung im Kontext der neueren Möglichkeiten der Finanzverwaltung untersuchen. Die Schätzung unterliegt, seitdem es neuere Methoden der EDV gibt, einem deutlichen Wandel. Die Unterstützung durch die EDV hat der Finanzverwaltung neue Werkzeuge an die Hand gegeben, derer sich der normale Steuerpflichtige wohl noch nicht bewusst ist. Zunächst sollen die rechtlichen Grundlagen der Schätzung betrachtet werden. Anschließend folgt eine Darstellung der gängigen Methoden der Schätzung und abschließend sollen die modernen Möglichkeiten der EDV zur Schätzung aufgezeigt werden. 180 pp. Deutsch.

Taschenbuch. Etat : Neu. This item is printed on demand - it takes 3-4 days longer - Neuware -Veröffentlichungen von Presse, Rundfunk, Fernsehen und anderen Medien können die Freiheitsrechte des einzelnen Bürgers verletzen. Sucht man infolgedessen nach Rechtsnormen, welche diesen Bereich der Abgrenzung zwischen Meinungs- und Pressefreiheit und Individualrechtsschutz regeln, so offenbart sich einem ein weitläufiges und verstreutes Terrain von Regelungen, welche die Verfasserin in ihrer Arbeit näher betrachtet.Aufgrund der besonderen Gefahren für den Persönlichkeitsschutz, resultierend aus der voranschreitenden Kommerzialisierung von Medieninhalten und deren Verbreitung über die Landesgrenzen hinweg, werden auch die Rechtssysteme von England und Frankreich vergleichend untersucht. Ein besonderes Augenmerk wird beim Vergleich dieser Länder auf die gegebenenfalls schon erfolgte Konvergenz der medienpersönlichkeitsrechtlichen Rechtsbehelfe gerichtet. Im ersten Teil der Arbeit wird die Existenz eines allgemeinen Persönlichkeitsrechts in den einzelnen Ländern untersucht und inwieweit dessen Schutz Beschränkungen erfährt. Mit den strafrechtlichen und zivilrechtlichen Schutzmechanismen in Deutschland, England und Frankreich befassen sich die darauffolgenden Abschnitte. Schlussendlich wird der Einfluss der EMRK in den verschiedenen Rechtsordnungen bewertet und verglichen sowie eine daraus resultierende Konvergenz untersucht. 280 pp. Deutsch.

Taschenbuch. Etat : Neu. This item is printed on demand - it takes 3-4 days longer - Neuware -Eine innovative Verbindung von Technologien und Dienstleistungen sind die sogenannten Telemonitoring-Dienstleistungen nieder. Hierbei betrachtet man anhand von neuen Technologien das Verhalten der Menschen und deren Umgebung und leitet daraus notwendige Aktivitäten ab. Insbesondere in der Betreuung von älteren und behinderten Menschen wird den Telemonitoring-Dienstleistungen besondere Bedeutung zugemessen. Gleichzeitig stehen Telemonitoring-Dienstleistungen im Allgemeinen noch vor der Marktphase. Einer massenhaften Anwendung stehen mehrere Diffusionshemmnisse entgegen: Probleme der Nutzerakzeptanz, technische Restriktionen, unzureichende Geschäftsmodelle und die Unterschätzung von Diffusionsrestriktionen in komplexen Systemen. Die fehlende Akzeptanz ist wiederum teilweise auf Vorbehalte gegenüber der Überwachung und Kontrolle durch eine Telemonitoring-Dienstleistung zurückzuführen. Das richtige Maß zwischen Kontrollen durch den Dienstleistungsanbieter und der Wahrung der Privatsphäre des Kunden muss getroffen werden.In dieser Arbeit werden die externe Kontrolle durch den Betreuer und die Wahrung der Privatsphäre des zu Betreuenden als berufsethische Aspekte identifiziert. Kontrolle und Privatsphäre stehen dabei in einer natürlichen Spannung zueinander: Die Übertreibung der Kontrolle ergibt Fremdbestimmung, die Übertreibung von Privatsphäre ergibt Vernachlässigung. Die Betonung von Kontrolle verringert die Privatsphäre, ebenso andersherum. Es wurden zwei Varianten der Telemonitoring-Dienstleistung entwickelt. Die beiden unterscheiden sich im Zeitpunkt, in dem Daten die Wohnung des zu Betreuenden verlassen. In Variante 1, in der die Daten die Wohnung frühzeitig verlassen, wird die externe Kontrolle des Betreuers stärker betont. In Variante 2 wird die Privatsphäre der zu betreuenden Person stärker betont. In beiden Varianten wird die natürliche Spannung zwischen den Werten adäquat eingehalten: Es ist gewährleistet, dass die Entscheidungsfreiheit des Bewohners gewahrt wird, die Verantwortungspflicht des Betreuers gesichert ist und der Datensparsamkeitsgrundsatz in beiden Varianten eingehalten wird. 284 pp. Deutsch.

Taschenbuch. Etat : Neu. This item is printed on demand - it takes 3-4 days longer - Neuware -Im Zuge der Weiterentwicklung in der Automobilindustrie in Richtung des pilotierten Fahrens stellt eine hoch genaue Ortung des Fahrzeugs eine Basistechnologie für verschiedene Systeme dar. Durch die damit steigenden Anforderungen an Navigations- und Fahrerassistenzsysteme gewinnt die Ermittlung einer fahrstreifengenauen Fahrzeugposition immer mehr an Bedeutung. In dieser Arbeit wird untersucht, inwieweit es durch Verarbeitung von Sensordaten aktueller Serienfahrzeuge möglich ist, die aktuell befahrene Spur und die damit zusammenhängende Anzahl der Spuren zu erfassen. Hierfür wird das Fahrzeugumfeld sensorisch erfasst, interpretiert und mit Kartendaten abgeglichen. Die Leistungsfähigkeit der Algorithmen wird auf verschiedenen Straßenklassen, Verkehrslagen sowie Witterungsbedingungen getestet. 250 pp. Deutsch.

Taschenbuch. Etat : Neu. This item is printed on demand - Print on Demand Titel. Neuware -Die E.ON Avacon sieht sich als regionaler Verteilnetzbetreiber im besonderen Maße mit dem Ausbau der regenerativen Energiequellen konfrontiert. Neben dem enormen Ausbau der Nutzung der Windenergie in den vergangenen zwei Jahrzehnten, welche vornehmlich die Mittel- und Hochspannungsnetze betroffen hat, ist in der näheren Vergangenheit ein rasantes Wachstum auf dem Gebiet der Fotovoltaik zu beobachten. Diese Anlagen werden zu einem großen Teil in den Niederspannungsnetzen (NS-Netzen) angeschlossen und stellen den Netzbetreiber vor eine völlig geänderte Netzaufgabe, welche vielfach zu einem erheblichen Netzausbaubedarf führt. Die sich ergebenden Effekte werden durch die zusätzliche Einbindung von Mikro- und Mini-Blockheizkraftwerden in die Verteilnetze weiter verstärkt. Dieser neuen Aufgabenstellung begegnet die E.ON Avacon (EAV) zum Einen durch klassischen Netzausbau, zum Anderen aber auch durch die Erprobung und den zukünftigen Einsatz innovativer Technologien. Hierzu zählt auch der Einsatz des neuen Betriebsmittel ¿regelbarer Ortsnetztransformator¿ (rONT). Für dieses Betriebsmittel liegen weder Betriebserfahrungen noch ein genaues Lastenheft vor. Aus diesem Grund führt die EAV einen Feldversuch zum Sammeln praktischer Erfahrungen in ihren Netzgebiet durch und beauftragt weiterhin das Energie-Forschungszentrum Niedersachsen (EFZN) zur Durchführung dieser Orientierungsstudie. Ziel dieser Studie ist es, erste theoretische Erkenntnisse bezüglich des neuen Betriebsmittels rONT zu gewinnen, prinzipielle Anforderungen an einen späteren Serientyp zu definieren und potenziell auftretende Spannungsfelder sowie notwendige wissenschaftliche Vertiefungen aufzuzeigen.Cuvillier Verlag, Nonnenstieg 8, 37075 Göttingen 100 pp. Deutsch.