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排序方式: 共有75条查询结果,搜索用时 78 毫秒
1.
Modeling of stress and electromigration at the microscopic level, in confined interconnect metallic lines with tungsten studs, can very well account for the resistance behaviour in time. The resistance change at saturation for a metallic line with blocking boundaries at both ends can be related, according to the model, to threshold product (jL)c found by Blech [1]. 相似文献
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Summary A mathematical model for the solidification process of a melted film coating a spherical particle plunged in an immobile fluid is presented. This model may be used in order to determine temperature distribution in the vicinity of the particle. The results obtained using a melted sulphur thin film cooled with air are consistent with the data available in literature. 相似文献
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Summary A mathematical model for the cooling process of a molten drop, falling freely in a fluid, is presented. This model is used to determine the duration of the cooling stage of an urea drop. The distribution of the temperature, as function of time and radius, is determined. 相似文献
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Calin-Cristian Cormos Ana-Maria CormosLetitia Petrescu 《Chemical Engineering Research and Design》2014
Carbon capture and storage (CCS) technologies are expected to play a significant role in the coming decades for curbing the greenhouse gas emissions and to ensure a sustainable development of power generation and other energy-intensive industrial sectors. Chemical looping systems are very promising options for intrinsically capture CO2 with lower cost and energy penalties. Gasification offers significant advantages compared with other technologies in term of lower energy and cost penalties for carbon capture, utilization of wide range of fuels, poly-generation capability, plant flexibility, lower environmental impact, etc. 相似文献
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C. Ciobanu E. Stoica C. N. Cascaval D. Rosu L. Rosu M. State A. Emandi I. Nemes F. Petrescu 《应用聚合物科学杂志》2007,103(2):659-669
Polyurethane (PU) with lactate structures in its conformation can be used as a biological and biodegradable polymer. Polyurethane lactate (PUL) was doped with small quantities of an erbium (Er3+) complex, which hindered the N?N group. 2,2′‐Dihydroxyazobenzene was used as a ligand for the Er3+ complex. PUL in the presence of the used Er3+ complex caused water from the complex to be replaced by the polar structures from the polymer. These structures acted as crystallization germs for the structuration of the PU matrix. As a consequence, both the mechanical and thermal properties of the polymer were improved. The sample with the highest mechanical properties contained only 0.064 μmol of Er3+ complex/g of sample. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 103: 659–669, 2007 相似文献
9.
Theoretical and experimental study on composite steel-concrete shear walls with vertical steel encased profiles 总被引:1,自引:0,他引:1
The present work describes the theoretical study and the experimental tests on composite steel-concrete shear walls with steel encased profiles (CSRCW), performed at Politehnica University of Timi?oara, Romania. The composite steel-concrete structural shear walls with steel encased profiles can be used as horizontal resisting systems for buildings that require considerable large horizontal load capacity. The study consists in numerical analysis and tests on 1:3 scale experimental steel-concrete composite elements. The experimental elements differ by the arrangement of the steel shapes embedded in the cross section of the wall and by the cross section type of the steel encased element. Headed steel studs are provided to ensure the connection between the steel profiles and the concrete. The aim of this study is to analyze the nonlinear behavior of elements, focused on the connection between the steel profiles and the concrete respectively, to compare the behavior of shear walls with different steel shape encased profiles with typical reinforced concrete shear walls. Using the tests performed until failure, the maximum load, the deformation capacity and the dissipated energy were evaluated. 相似文献
10.
M Stoian C Dragomir C D?sc?lescu S P?dureanu M Damian 《Canadian Metallurgical Quarterly》1995,99(1-2):82-89
Pathological aspects in 100 cases of operated A.P. different in severity are not strictly related to aetiological conditions. Clinical observations have suggested some components of pathogenesis: obstruction of bilio-pancreatic inflow in duodenum at the beginning of the attack, bilio-pancreatic reflux on cholangiograms, strong secretory digestive stimulation before attack. Some experimental animals models (dogs) which can mimic pathogenic mechanism (obstruction of pancreatic flow, common bilio-pancreatic duct, closed duodenal loop, acute cholecystitis) have revealed characteristic pathological changes depending on the initiating process. Our conclusion that severity of pathological changes in A.P. are determined by the initiating mechanisms which may differ in some aetiological condition or may be common for different ones. 相似文献