第六届嵌入式峰会将在金秋的北京隆重举行

第六届（2009）中国嵌入式技术应用高峰论坛将于2009年9月17日下午在北京丽亭华苑酒店隆重举行。本届峰会以“科技推动发展创新铸就辉煌”为主题,由中国计算机行业协会、研祥智能科技股份有限公司联合主办。     

A unified statistical framework for monitoring multivariate systems with unknown source and error signals

This article proposes a unified multivariate statistical monitoring framework that incorporates recent work on maximum likelihood PCA (MLPCA) into conventional PCA-based monitoring. The proposed approach allows the simultaneous and consistent estimation of the PCA model plane, its dimension and the error covariance matrix. This paper also invokes recent work on monitoring non-Gaussian processes to extract unknown Gaussian as well as non-Gaussian source signals from recorded process data. By contrasting the unified framework with PCA-based process monitoring using a simulation example and recorded data from two industrial processes, the proposed approach produced more accurate and/or sensitive monitoring models.     

Modulation of infectivity in phage display as a tool to determine the substrate specificity of proteases

Proteases play an important role in human and animal diseases. Rapid determination of substrate specificity is possible through the use of substrate phage display; however, current methods possess several drawbacks. They require phage-immobilization and cannot be used for infectivity-destroying or affinity tag-destroying proteases; this can make entire libraries useless. To overcome these limitations, here we introduce infectivity-modulated phage display (IMOP). IMOP uses a protease-resistant and infectivity-reducing tag fused to substrate-displaying polyvalent phages, and the specific cleavage of the substrate increases the infectivity of the phages by releasing the infectivity-reducing tag. The resulting phages were first tested with the infectivity-destroying detergent protease subtilisin; this resulted in a highly specific substrate at a 200-fold enrichment. In a second example, the protease ompT was used and led to an enrichment of the known double-arginine motif. The IMOP system thus substantially improves and simplifies previous systems.     

Passive sampling of airborne peroxyacetic acid

The first passive sampling device for the determination of airborne peroxyacetic acid (PAA) is presented. 2-([3-{2-[4-Amino-2-(methylsulfanyl)phenyl]-1-diazenyl}phenyl]sulfonyl)-1-ethanol (ADS) is used to impregnate glass fiber filters, and the reagent is oxidized by PAA to the corresponding sulfoxide ADSO. After elution of the filters, ADS and ADSO are separated by reversed-phase HPLC and detected by UV/visible absorbance. Limit of detection is 30 ppb, limit of quantification is 90 ppb (for 30 min sampling), and the linear range comprises 2 orders of magnitude. Thorough investigations were carried out with respect to the selectivity of the method toward hydrogen peroxide, and air samples were analyzed successfully after disinfection of a laboratory area.     

MiniSKiiPIPM面向中等功率应用的先进模块架构

电力电子技术可以帮助提高能源效率和节约大量能源,尤其是在中等功率应用市场中。得益于其高集成度和简单的组装,本文所介绍的600V智能IGBT功率模块能够促进电力电子的应用。该模块的特点在于其基于双极性电平转换器的先进概念。因此,所集成SOI驱动器不受参考电压变化的影响,输出功率高达15kW,从而提高了在应用中的可靠性。     

MiniSKiiP~IPM面向中等功率应用的先进模块架构

电力电子技术可以帮助提高能源效率和节约大量能源,尤其是在中等功率应用市场中。得益于其高集成度和简单的组装,本文所介绍的600V智能IGBT功率模块能够促进电力电子的应用。该模块的特点在于其基于双极性电平转换器的先进概念。因此,所集成SOI驱动器不受参考电压变化的影响,输出功率高达15kW,从而提高了在应用中的可靠性。     

Modellbildung und Simulation von Klimawechselprüfungen

For many years the number and complexity of laboratory tests used in the automotive industry has been increasing steadily in order to simulate field-specific climatic corrosion loads and the corrosion damage resulting from them. The test environment defines the environmental impact applied to the component globally by specifying control variables to be set in the test. However, the initiation of a damage mechanism is essentially influenced by the retroactive effect of the design on local, transient load characteristics, such as different wetting intervals and local media composition. In order to better evaluate the multitude of available tests with regard to corrosive damage, the knowledge of local corrosive loads is essential, but these cannot be measured with either spatial or time resolution. This gap can be closed by using numerical simulation.Concepts and basics of a multiscale CFD simulation model as a basis for virtual corrosion testing are presented, which show that numerical simulation can make a significant contribution to understanding complex corrosion tests and the effects of product design. In addition to the test-typical test sequences, the simulation also takes into account the type of media loading and flow control in the chamber, the geometry of the test specimens, and the thermal properties of the material. The advantages of numerical simulation for the support and optimization of climate testing are illustrated with an exemplary comparison of a climate change test in the model and experiment.     

On the growth of intermetallic phases by heat treatment of friction stir welded aluminum steel joints

Multi-material components made from aluminum and steel sheet metal are an innovative approach for weight reduction in automotive applications. However, lightweight components made from aluminum and steel require suitable joining technologies. A promising solid-state welding technology for producing dissimilar steel aluminum joints is Friction Stir Welding, which minimizes the formation of Fe-Al intermetallic phases due to process temperatures lower than the melting temperatures of the base material. The results obtained show a comparison of steel aluminum joints made by FSW using DC04 mild steel with the strain hardened aluminum alloy AA5754-H22 on the one hand and the precipitation hardened aluminum alloy AA6082-T6 on the other hand. The difference between achieved maximum tensile strengths of the joints in relation to those from both base materials is investigated. Due to the stirring and heat input of the welding process, the temper condition of the precipitation hardened aluminum alloy is changed. To improve the mechanical properties of the welded joints, post weld heat treatments are performed. The post weld heat treatments of the produced multi-material specimens from AA6082-T6 aluminum alloy and mild steel at various heat treatment conditions show substantial growth of intermetallic phase layer, which is characterized in detail within the present work. Tensile tests show a degradation of the mechanical properties resulting in a decreased tensile strength and insufficient connection of both materials. Investigations using a scanning electron microscope (SEM) show a distinct increase of the thickness of intermetallic phases in the transition between aluminum and steel.     

Netzwerkbogenbrücken – Entwurf,Bemessung, Ausführung

Network arch bridge – design and execution. The construction of the network arch as a tied arch bridge with a framework stiffening is increasingly accepted in Germany. It combines the advantages of an arch with those of a framework. This enables the usages of very slender cross‐sections of arches and lower booms. In connection with the scarcely visible net of hangers a very transparent structure with less influence on the urban environment or landscape can be achieved. The network arch allows spans up to 300 m. In the following the principles of designing network arches are explained. Furthermore, the status quo of construction and calculating is described by examples of planned and already realized projects.     

Die Brücke über den Oberhafen in Hamburg

The bridge across the Oberhafenkanal in Hamburg. The replacement of 4 steel railway bridges with a total steel construction weight of 4000 tons in the centre of Hamburg, which connect the central station of Hamburg with the south of Germany was a great challenge in bridge building. The central steel superstructure of the bridge, the Oberhafenbrücke, a five‐span truss continuous beam is special because it is a combined railway and road bridge. The railway travels on the upper deck between the upper chords whereas the road traffic travels on the lower deck between the truss. This superstructure crosses the Oberhafenkanal. The available time for the complete building process comprised of statics, design, manufacturing and assembly was only 14months. The end of this process was totally fixed because of the long‐time announced complete shutdown of the railway connections to the south and parts of the Hamburg central station between December 24^th and December 31^st, 2007. Despite the new definition of substantial design‐parameters (load models for road and railway, permanent bearing‐system, temporary bearing‐system after December 31^st, 2007) and therefore a reduction of the available time by 4 months the task of building the new bridge was carried out successfully by the consortium comprised of Eiffel Deutschland Stahltechnologie GmbH, Bilfinger Berger AG ZN Hamburg and Jürgen Martens GmbH & Co. KG.