Combustion chemical vapor deposition

In this paper, flame‐pyrolytic treatment methods of metal surfaces are compared to vacuum‐based CVD processes. There is a practical consideration of the aforementioned methods. The layers formed were analyzed by scanning electron microscopy, changes in properties such as surface energy and adhesion of subsequent layers of paint were detected by measurement.     

Corrosion of metal bipolar plates for PEM fuel cells: A review

PEM fuel cells are of prime interest in transportation applications due to their relatively high efficiency and low pollutant emissions. Bipolar plates are the key components of these devices as they account for significant fractions of their weight and cost. Metallic materials have advantages over graphite-based ones because of their higher mechanical strength and better electrical conductivity. However, corrosion resistance is a major concern that remains to be solved as metals may develop oxide layers that increase electrical resistivity, thus lowering the fuel cell efficiency. This paper aims to present the main results found in recent literature about the corrosion performance of metallic bipolar plates.     

Book Received and Noted

Abstract

After half a century of photographing for the National Geographic magazine, my time had come to be put out to pasture. This posed no problem, as I had looked forward to the weeding out, editing, and printing of a vast hoard of negatives and colour transparencies amassed over these many years. Filing cabinets bulged with black and white photographs of all sizes, countless yellow Kodachrome boxes and memorabilia ranging from Swazi witchdoctor bones to Tibetan scrolls rescued from a crumbling chorten on the road to Leh.     

Prior shape level set segmentation on multistep generated probability maps of MR datasets for fully automatic kidney parenchyma volumetry

Fully automatic 3-D segmentation techniques for clinical applications or epidemiological studies have proven to be a very challenging task in the domain of medical image analysis. 3-D organ segmentation on magnetic resonance (MR) datasets requires a well-designed segmentation strategy due to imaging artifacts, partial volume effects, and similar tissue properties of adjacent tissues. We developed a 3-D segmentation framework for fully automatic kidney parenchyma volumetry that uses Bayesian concepts for probability map generation. The probability map quality is improved in a multistep refinement approach. An extended prior shape level set segmentation method is then applied on the refined probability maps. The segmentation quality is improved by incorporating an exterior cortex edge alignment technique using cortex probability maps. In contrast to previous approaches, we combine several relevant kidney parenchyma features in a sequence of segmentation techniques for successful parenchyma delineation on native MR datasets. Furthermore, the proposed method is able to recognize and exclude parenchymal cysts from the parenchymal volume. We analyzed four different quality measures showing better results for right parenchymal tissue than for left parenchymal tissue due to an incorporated liver part removal in the segmentation framework. The results show that the outer cortex edge alignment approach successfully improves the quality measures.     

The structure of intelligence in children and adults with high functioning autism.

Confirmatory factor analyses of the commonly used 11 subtests of the Wechsler child and adult intelligence scales were accomplished for 137 children and 117 adults with high functioning autism (HFA) and for comparable age groups from the standardization samples contained in the Wechsler manuals. The objectives were to determine whether the structure of intelligence in HFA groups was similar to that found in the normative samples, and whether a separate "social context" factor would emerge that was unique to HFA. Four-factor models incorporating a Social Context factor provided the best fit in both the autism and normative samples, but the subtest intercorrelations were generally lower in the autism samples. Findings suggest similar organization of cognitive abilities in HFA, but with the possibility of underconnectivity or reduced communication among brain regions in autism. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Contribution on the cold straightening of workpieces

First the material model for elastic-inelastic behaviour is explained against the background of cold straightening of plane workpieces. The change in geometry of the yield surface in the case of very small cyclic deformations and the influence of isotropic and kinematical work hardening are taken into account. Then case studies on numerical shakedown simulations and on the limits of cold straightening of plane workpieces follow using two material models. Finally the attainable permanent curvature is shown as a function of load and of the number of cycles. Residual stresses and the spring-back resilience involved are taken into account.     

纳米操纵机器人及其自动化设计

在纳米技术和纳米材料领域,纳米操纵机器人已经成为一种用于分析和制作原型纳米器件的使能技术.这类纳米操纵机器人拾放操作灵活,可将单个纳米器件集成到现有的微器件中来提高微器件的总体性能和灵敏度.如今这种被称作微纳米集成装配的自动化装置不再局限于实验室使用,还需要应用于工业领域.本文综述了纳米微操作机器人的产生、集成装配和自动化等方面的基础技术,同时探讨了不同种类原子力显微镜超级探针的装配方案.     

Explosionskenngrößen von Ethylenoxid und Ethylenoxid/Propylenoxid‐Gemischen

Gas phases of ethylene oxide and propylene oxide, commonly used for technical alcoxylation reactions, can decompose explosively with an enormous temperature and pressure rise even without the presence of air. For the estimation of consequences of such reactions explosion pressures and rates of pressure rise of EO and certain mixtures of ethylene oxide and propylene oxide at temperatures between 100 °C and 200 °C and pressures between 1 bar and 10 bar were determined experimentally using vessels with volumes of 3 dm³ and 100 dm³.