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PP+FeSi复合材料流变性能测试及数值模拟

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高分子材料科学与工程 2010年第3期26卷 164-167,171页

作者：李松柏 KIRCHBERG Stefan 谢磊蒋炳炎中南大学机电工程学院 Institute of Polymer Materials and Plastics Engineering Tu-Clausthal.38678Clausthal-ZellerfeldGermany

为探讨注射成型能否生产复杂外形软磁改性塑料器件,配比了聚丙烯(PP)添加不同体积含量FeSi粉末的八个组成试样,测试了试样在不同温度随剪切速率变化的黏度、导热率和比热容,在注塑机上进行了流动长度测试。同时,运用麦夸特法+通用全局... 详细信息

为探讨注射成型能否生产复杂外形软磁改性塑料器件,配比了聚丙烯(PP)添加不同体积含量FeSi粉末的八个组成试样,测试了试样在不同温度随剪切速率变化的黏度、导热率和比热容,在注塑机上进行了流动长度测试。同时,运用麦夸特法+通用全局优化算法对黏度数据拟合,构建Cross-WLF黏度模型进行数值计算,其结果与试验结果一致。结果表明,随FeSi含量的增加,试样的黏度升高,比热容降低,导热率升高,流动性能变差;当FeSi含量达70%时流动长度只有纯PP的15%。因此,要想获得理想复杂外形的软磁改性塑料器件,须使用较大注射压力和较高熔体温度进行注射成型。

关键词：软磁改性塑料螺旋模流变性能 Cross-WLF模型

Application of Electron Beam Surface Technologies in the Automotive Industry

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材料热处理学报 2004年第5期25卷 573-578页

作者： Rolf Zenker Anja Buchwalder tu Bergakademie Freiberg /Zenker Consult Mittweida GermanyTU Bergakademie Freiberg Germany

Progress in the beam deflection technique opens up new possibilities for the application of electron beam (EB) surface and welding technologies in the automotive industry. This development is based on three-dimensional high-speed beam deflection and fully automatic online process control. So, in the EB surface treatment three-dimensional energy transfer fields can be realised which take into account the contour of a component, the conditions of heat conduction and the load conditions. High flexibility, precision and reproducibility are typical characteristics. High productivity is achieved by the simultaneous interaction of the EB in several processing areas or by carrying out several processes simultaneously. EB surface treatment is becoming more and more attractive and important especially in the automotive industry, and also in comparison to laser technologies. This paper deals with different EB surface technologies, for example hardening, remelting, surface alloying, dispersing or cladding of different materials such as steel, cast iron and different alloys of Al, Mg and Ti. Examples of applications in the automotive industry, especially engine components, will be discussed.

关键词：电子注铸铁 3D射束偏移表面热处理

About a New Way to Analyze Epileptic Events On-Line

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About a New Way to Analyze Epileptic Events On-Line

Conception of a new 4-quadrant hydrogen compressed air energy storage power plant with an integrated electrolyzer

第三届系统科学与系统工程国际会议

作者： M.Reuter M.Hlzler D.P.F.Mller Department of Technical Computer Science tu-clausthal D-38678 clausthal-Zellerfeld Erzstr. 1 Department of Technical Computer Science tu-clausthal D-38678 clausthal-Zellerfeld Erzstr. 1 Department of Technical Computer Science tu-clausthal D-38678 clausthal-Zellerfeld Erzstr. 1

＜正＞ Normally EEG-signatures are analyzed by transferring the time signal of the electrodes into the frequency domain by a common FFT- or wave-let-transformation. As we will show in this paper, better and faster results can be obtained, if instead of these algorithm the FD-operation is applied to the pure time-signal and further on a DAS-calculation for eliminating the noisy contributions is done. Specially we will compare the signatures of some epilepsy events analyzed by common signal analysis and by the class-oriented DAS- and FD-operations.

关键词： EEG-supervision FD-Spectra epilepsia- recognition

来源： cnki会议评论

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Energy Reviews 2024年第3期3卷 92-101页

作者： Hans-Peter Beck Ann-Kathrin Klaas Christoph Klaas Research Center Energy Storage Technologies Clausthal University of TechnologyAm Stollen 19A38640GoslarGermany Institute of Electrical Power Engineering and Energy Systems Clausthal University of TechnologyLeibnizstraße 2838678Clausthal-ZellerfeldGermany

A hydrogen compressed air energy storage power plant with an integrated electrolyzer is ideal for large-scale,long-term energy storage because of the emission-free operation and the possibility to offer multiple ancillary services on the German energy *** paper defines analyzes such a storage concept and conducts an extensive comparison with four additional storage concepts based on various *** results show that the combination of storing compressed air and hydrogen offers a higher efficiency than storing only hydrogen and lower specific investment costs than storing only compressed *** result is confirmed with analysis of the optimal sizing of each power plant component for simultaneous participation on multiple energy markets with a linear optimization dispatch *** hydrogen compressed air energy storage(HCAES)power plant can utilize more revenue possibilities than a hydrogen energy storage because of the higher round-trip efficiency and the combination of the air compressor and the integrated electrolyzer during charging *** integration of the electrolyzer,however,offers a couple of challenges itself because of the highly flexible operation mode.A new concept for the controllable 24-pulse diode-thyristor rectifier of the electrolyzer is presented,that uses mostly common components while offering little to no grid harmonics and a long *** flexible integrated electrolyzer allows for the 4-quadrant operation of the storage power plant.

关键词： Long-term energy storage Hydrogen energy storage Compressed air energy storage Mixed-integer linear programming Electrolyzer 24-Pulse thyristor rectifier

Variability in distribution of major and trace elements in Lower Eocene siliceous sections of the Transuralian Region, Russia

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Acta Geochimica 2019年第2期38卷 262-276页

作者： P.V.Smirnov A.O.Konstantinov G.A.Batalin B.I.Gareev Tyumen Industrial University Technische Universit?t clausthal Kazan Federal University

This paper presents lithologic and geochemical data from the sequence of the Eocene Irbit formation siliceous rocks(Transuralian Region) outcropping in a quarry in the Irbit deposit(thickness of 15 m) and in a large natural outcrop, Belaya Gorka(thickness of 13 m). The data show that both outcrops are composed of diatomites and clayey diatomites, both characterized by a certain degree of lithologic heterogeneity around their chemical,granulometric, and mineralogical compositions;microstructural features; and degree of diatom preservation. The values of indices important for the classification of siliceous rocks and determination of prospects for their industrial application—SiO_2, Al_2O_3, Fe_2O_3, and clay fraction content—ranged from 66% to 77%, 7% to 14%,3.00% to 5.60%, and 23% to 50%, respectively. In all studied lithologic varieties, element abundances of V, Cr,Mn, Co, Ni, Cu, Zn, Ga, Ge, and Sb were two to three times higher than their respective abundances in the Earth's crust. This is probably related to these elements' involvement in the biological cycle and favorable conditions for transport. Rb, Cs, Ba, and Sr, as well as rare earth elements,are considered the most reliable indicators of lithologic and geochemical subdivision of a sequence of siliceous rocks,as they are associated mainly with clayey minerals. Variations in these indicators have recorded, with great probability, even short-term cycles and semi-cycles of silicasedimentation in the Transuralian Region, as well as tectonic regime and involvement of terrigenous influx.

关键词： Diatomite Clayey diatomite Irbit formation Eocene Geochemical variability

STABILIZED FEM FOR CONVECTION-DIFFUSION PROBLEMS ON LAYER-ADAPTED MESHES

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Journal of Computational Mathematics 2009年第2期27卷 266-279页

作者： Hans-Grg Roos tu Dresden Germany

The application of a standard Galerkin finite element method for convection-diffusion problems leads to oscillations in the discrete solution, therefore stabilization seems to be necessary. We discuss several recent stabilization methods, especially its combination with a Galerkin method on layer-adapted meshes. Supercloseness results obtained allow an improvement of the discrete solution using recovery techniques.

关键词： Singular perturbations Convection-diffusion Finite element method Stabi-lization Layer-adapted mesh Superconvergenee Recovery

New Type of Basic Functions of FEM in Application to Solution of Inverse Heat Conduction Problem

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Journal of Thermal Science 2002年第2期11卷 163-171页

作者： MichaelJ.CIALKOWSKI tu Poznan Poland

The work presents the application of heat polynomials for solving an inverse problem. The heat polynomials form the Treffetz Method for non-stationary heat conduction problem. They have been used as base functions in Finite Element Method. Application of heat polynomials permits to reduce the order of numerical integration as compared to the classical Finite Element Method with formulation of the matrix of system of equations.

关键词： non-stationary heat conduction problem Treffetz method FEM new basic function.

Crystal morphology of sucrose influenced by rotation axes parallel to growth planes

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Chinese Science Bulletin 2000年第16期45卷 1468-1471页

作者： C.Silber H.Follner Institut Für Mineralogie und Mineralische Rohstoffe der Technischen Universitat clausthal Adolph-Roemer-Str.2AD-38678 Clausthal-ZellerfeldDeutschlandInstitut Für Mineralogie und Mineralische Rohstoffe der Technischen Universitat ClausthalAdolph-Roemer-Str.2AD-38678 Clausthal-ZellerfeldDeutschland

Three different types of growth forms of sucrose (P21) were found by calculating with the Fourier transform method of crystal morphology. The observed central distances of the (100) and (001) faces are smaller than those calculated. It will be shown that the two-fold screw axis, which runs parallel to these faces, influences the rate of growth. The effectiveness of these symmetry elements is relative to the rotation angle around the face normal.

关键词： sucrose crystal growth mechanism symmetry dependent growth Fourier transform method of morphology.

Seamless and non-repetitive 4D texture variation synthesis and real-time rendering for measured optical material behavior

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Computational Visual Media 2019年第2期5卷 161-170页

作者： Martin Ritz Simon Breitfelder Pedro Santos Arjan Kuijper Dieter W. Fellner Fraunhofer IGD Darmstadt64283Germany tu Darmstadt Darmstadt64289Germany tu Graz Graz8010Austria

We show how to overcome the single weakness of an existing fully automatic system for acquisition of spatially varying optical material behavior of real object surfaces. While the expression of spatially varying material behavior with spherical dependence on incoming light as a 4D texture(an ABTF material model) allows flexible mapping onto arbitrary 3D geometry, with photo-realistic rendering and interaction in real time,this very method of texture-like representation exposes it to common problems of texturing, striking in two disadvantages. Firstly, non-seamless textures create visible artifacts at boundaries. Secondly, even a perfectly seamless texture causes repetition artifacts due to their organised placement in large numbers over a 3D surface. We have solved both problems through our novel texture synthesis method that generates a set of seamless texture variations randomly distributed over the surface at shading time. When compared to regular 2D textures, the inter-dimensional coherence of the 4D ABTF material model poses entirely new challenges to texture synthesis, which includes maintaining the consistency of material behavior throughout the 4D space spanned by the spatial image domain and the angular illumination hemisphere. In addition, we tackle the increased memory consumption caused by the numerous variations through a fitting scheme specifically designed to reconstruct the most prominent effects captured in the material model.

关键词： optical material behavior reflectance modeling 4D texture synthesis texturing