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排序方式: 共有130条查询结果,搜索用时 15 毫秒
71.
A numerical implementation of the direct boundary-domain integral and integro-differential equations, BDIDEs for treatment of the Dirichlet problem for a scalar elliptic PDE with variable coefficient in a three-dimensional domain is discussed. The mesh-based discretisation of the BDIEs with tetrahedron domain elements in conjunction with collocation method leads to a system of linear algebraic equations (discretised BDIE). The involved fully populated matrices are approximated by means of the H-Matrix/adaptive cross approximation technique. Convergence of the method is investigated. 相似文献
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Charles J. Hages Sergej Levcenco Caleb K. Miskin Jan H. Alsmeier Daniel Abou‐Ras Regan G. Wilks Marcus Br Thomas Unold Rakesh Agrawal 《Progress in Photovoltaics: Research and Applications》2015,23(3):376-384
Nanocrystal‐based Cu2Zn(SnyGe1‐y)(SxSe4‐x) (CZTGeSSe) thin‐film solar cell absorbers with tunable band gap have been prepared. Maximum solar‐conversion total area efficiencies of up to 9.4% are achieved with a Ge content of 30 at.%. Improved performance compared with similarly processed films of Cu2ZnSn(SxSe4‐x) (CZTSSe, 8.4% efficiency) is achieved through controlling Ge loss from the bulk of the absorber film during the high‐temperature selenization treatment, although some Ge loss from the absorber surface is still observed following this step. Despite limitations imposed by elemental losses present at the absorber surface, we find that Ge alloying leads to enhanced performance due to increased minority charge carrier lifetimes as well as reduced voltage‐dependent charge carrier collection. Copyright © 2013 John Wiley & Sons, Ltd. 相似文献
75.
Rinat M. Akhmetkhanov Sergej V. Kolesov Elmira I. Nagumanova Natalya N. Kabalnova Ruslan R. Akhmetkhanov Gennadi E. Zaikov 《应用聚合物科学杂志》2006,99(6):2885-2887
The process of stabilization of a poly(vinylchloride) elemental sulfur in thermal and thermooxidative destruction conditions is investigated. The high stabilizing efficiency of elemental sulfur is revealed at the destruction of plasticized poly(vinylchloride) compared with the efficiency of phenolic antioxidants. © 2005 Wiley Periodicals, Inc. J Appl Polym Sci, 2006 相似文献
76.
Experimental analysis of irregularities of metallic surfaces generated by abrasive waterjet 总被引:2,自引:0,他引:2
Jan Valí
ek Milan Drík Sergej Hloch Miloslav Ohlídal Luptk Miloslav Miroslav Gombr Agta Radvansk Petr Hlav
ek Kateina Pleníkov 《International Journal of Machine Tools and Manufacture》2007,47(11):1786-1790
Experimental study of the surface quality produced by abrasive waterjet (AWJ) on metallic materials has been performed. The surface roughness/waviness was quantitatively evaluated by using the contactless optical measurement. In order to characterize the cut surface qualities, a single-parameter criterion has been proposed. Based on root mean square (RMS) roughness evaluation of the worst cut surface zone, the dimensionless statistical parameter C can be calculated as a basic quantity for AWJ surface cut characterization. As it was approved, besides its dependency on depth of AWJ trace, the value of C-parameter for the specific material is noticeably related also to the traverse speed of the cutting head. Such a relationship can be potentially used for adjusting the cutting speed of the machining process. 相似文献
77.
Muslim Dvoyashkin Alexey Khokhlov Sergej Naumov Rustem Valiullin 《Microporous and mesoporous materials》2009,125(1-2):58
Surface diffusion of n-heptane in two mesoporous adsorbents with different morphologies of the pore network, namely Vycor random porous glass and porous silicon with linear pores, have been studied using pulsed field gradient NMR. The experimentally obtained diffusivities revealed increasing mobility of guest molecules with increasing surface coverage, indicating heterogeneity of the surface properties. The diffusion studies at different temperatures have further confirmed this hypothesis. The activation energies for surface diffusion turned out to be a function of surface coverage. The experimental results obtained are analyzed using a model of surface diffusion taking account of a distribution of the transition rates. 相似文献
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Sergej Fatikow 《光学精密工程》2013,21(4)
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. 相似文献
80.
Vinay Sharma Somnath Chattopadhyaya Sergej Hloch 《The International Journal of Advanced Manufacturing Technology》2011,56(9-12):1019-1025
The process of material cutting and fracture by high velocity water jets is a complex series of phenomena which may involve compression, tension, shear, erosion, wears, cracking, wave propagation, and cavitations damage. This makes the exact analysis of the jet cutting process to be very complicated. The problem of water jet coal cutting is a multiresponse problem. There are two output variables, depth of cut and cutting width whose optimization will result in the increase in the productivity of coal cutting. In this paper, a Taguchi?CFuzzy decision method has been used to determine the effective process parameters for improving the productivity of coal mines. The Taguchi method of experimental design is a widely accepted technique used for producing high quality products at low cost. The optimization of multiple responses in complex processes is common; therefore, to reduce the degree of uncertainty during the decision making, fuzzy rule-based reasoning was integrated with the Taguchi loss function. 相似文献