Numerische Simulation der Faserbewegung beim Strangpressen kurzfaserverstärkter Glasschmelzen

Numerical Simulation of the Fibre-Motion during the Extrusion of Short-Fibre-Reinforced Glass-Melts Fibre-reinforced materials are characterized by an anisotropic behaviour of the mechanical properties, which is caused by the alignment of the embedded fibres. In the case of short-fibre-compounds this behaviour is strongly influenced by the mechanism of flow during the manufacturing process. Numerical simulation Methods are preferentially used to get informations about the orientation of the reinforced fibres at the end of the molding-process and to improve the properties of the compound. For that, a model is developed, which calculates the motion of the short-fibres in the area of flow, basing on a three-dimensional finite-element-computation. Thereby the interaction between the Particular fibres during the orientation process is considered by using an interaction coefficient. Examplified at the extrusion of short fibre reinforced glass-melts, the fibre orientation is determined at models with different geometries of the pressing tool and variable boundary conditions. This procedure allows to determine the influence of the process-parameters On the expected quality of the composite. The represented simulation-model can also be used for other molding- and extrusion-processes of fibre reinforced materials.     

Reading epilepsy: report of five new cases and further considerations on the pathophysiology

Liposomes, microscopic lipid vesicles consisting of concentric phospholipid bilayers enclosing discrete aqueous spaces, have been investigated extensively as carries for drugs in attempts to achieve selective deposition and/or reduced toxicity. Liposomes radiolabeled with gamma emitters (67Ga, 111In and 99mTc) have been used for imaging purposes. Liposomes as formulated in the past, are rapidly taken up by cells of the mononuclear phagocyte system, primarily those located in liver and spleen. However, it has been shown during the last two decades that the in vivo behavior of liposomes can be modulated by modifying their formulation. The size and the lipid composition have a major influence on the blood clearance rate, hepatic uptake and splenic uptake of liposomes. The development of long circulating liposomes, in particular coating of the bilayer with polyethyleneglycol (PEG) resulted in liposomes that oppose recognition by the MPS, thus displaying even longer circulatory half-lives. By carefully adjusting the liposomal formulation, the in vivo characteristics of liposomes can be tailored such that they become suitable vehicles for imaging various pathological processes in vivo. Liposomes have been proposed for tumor imaging, for infection imaging and as blood pool markers. Here, the factors that determine the in vivo behavior of liposomes and the current status of liposome-based radiopharmaceuticals are reviewed.     

A Discrepancy in Analyses of the MSCEIT--Resolving the Mystery and Understanding Its Implications: A Reply to Gignac (2005).

Replies to comments made by G. E. Gignac (see record 2005-06671-010) on the current authors' original article (see record 2003-02341-015). Gignac reanalyzed the factor structure of the Mayer-Salovey-Caruso Emotional Intelligence Test (MSCEIT) and found results that differed from those the authors obtained initially. The authors tracked down the surprising sources of those discrepancies. G. E. Gignac's hierarchical model of emotional intelligence appears promising, and the authors anticipate that further investigations of the MSCEIT factor structure may yield additional information. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Foreword

Reliable Computing -     

Exploring the universality of personality judgments: Evidence from the great transformation (1000 BCE–200 BCE).

We examined whether personality judgments were present in texts of the diverse religious and philosophical traditions that emerged during the Great Transformation, an era spanning roughly 1000 BCE to 200 BCE. Some psychologists have suggested that the tendency of humans to judge personality has evolved; if some ancient societies failed to record personality judgments, it would be evidence against such an evolutionary position. In addition, learning about the prevalence and specifics of ancient personality judgments can help psychologists better understand the prehistory of personality psychology. Eight cultural traditions were studied: two each from China (Confucianism, Taoism), Greece (Classical and Hellenistic philosophy), India (Buddhism, Hinduism), and the Middle East (Judaism, Zoroastrianism). We found evidence that personality judgments were an important aspect of all of these traditions. Not only did people judge one another, but they also offered instructions on how to judge others. (PsycINFO Database Record (c) 2011 APA, all rights reserved)     

Das Kupferbergwerk Prettau – ein Altbergbau mit Zukunft

There can be different ways of future use for old mines. In our example, the former copper mine is used as a showmine and as a climate gallerie. There was made a digital 3D-model of the old mine for the showmine visitors which can be also used for an enlargement of this mine.     

High Response Control of Stator Watts and Vars for Large Wound Rotor Induction Motor Adjustable Speed Drives

Extremely rapid control response (0.01 s) of stator watts and vars has been obtained on a 15 000-hp wound rotor induction machine with a cycloconverter controlled secondary by means of an orthogonal control scheme which linearizes the machine equations and combines both feedforward and feedback error signals. Leading and lagging power factor and positive or negative stator power flow can be smoothly and rapidly controlled over a speed range in excess of ±35 percent of the induction motor synchronous speed. This doubly fed drive may be termed a "Scherbiustat drive" because the wound rotor induction motor secondary power conversion equipment is the static equivalent of the Scherbius machine. This type of a drive does not employ a dc link in the motor secondary power conversion equipment. It should not be confused with a static Kraemer drive which employs a dc link in the frequency conversion process and was so named because of its similarity to the original Kraemer drive which uses a synchronous converter and a dc motor in the secondary power conversion process. Recently obtained field results have verified the original study results discussed herein.     

A hardware demonstrator for TD-CDMA

TD-CDMA is an air interface concept for third-generation mobile radio systems. It utilizes a combination of the three elementary multiple-access schemes: frequency-division multiple access (FDMA), time-division multiple access (TDMA) and code-division multiple access (CDMA). Multiple-access interference (MAI) and intersymbol interference (ISI) are combated by joint detection of all simultaneous signals of the same cell, achieving a high spectrum efficiency. The authors have been involved in the implementation of a first experimental hardware setup of a TD-CDMA mobile radio system. Important objectives of this project are the demonstration of the economic feasibility of CDMA receivers utilizing joint detection and the performance verification of TD-CDMA by measurement campaigns. The authors present a new way of modeling the TD-CDMA receiver in the form of a data-flow model. This model serves as a starting point for the systematic design of an efficient software architecture for TD-CDMA based on a multiprocessor system. The complete digital signal processing (DSP) of a mobile terminal or of a base station can be implemented on a single Texas Instruments digital signal processor TMS320C80. Measurement results obtained by first field trials are presented. The system parameters of the TD-CDMA demonstrator described are similar but not equal to those chosen for the time-division duplex (TDD) mode of the UMTS terrestrial air interface according to the ETSI decision taken in January 1998.     

Messmethoden zur Charakterisierung von Mikrowellenleistungstransistoren

For first try designs of microwave power amplifiers it is necessary to know the entire physical behaviour of the used components with high accuracy. The attention should be directed especially to the center component of these circuits, the power transistor, whose nonlinear characteristics have an essential impact on the behavior of the whole amplifier. This article gives an overview of current methods of measurement for microwave power transistor characterization. Furthermore a measurement system is presented, capable of characterizing microwave power transistors within a frequency range from 30 kHz to 8.7 GHz at bias current up to 7.5 A including self heating effects.