1,611 research outputs found
Petrology and geochronology of the Namche Barwa Complex in the eastern Himalayan syntaxis, Tibet: constraints on the origin and evolution of the north-eastern margin of the Indian Craton
No full textAbstract not availableZeming Zhang, Xin Dong, M. Santosh, Feng Liu, Wei Wang, Fei Yiu, Zhenyu He, Kun She
中小学校园公共空间自然可视率量化研究
No full textIn order to solve the problem that the traditional method is very complex in safety assessment of primary and secondary school, which cannot get an objective result quickly. The method of calculating the natural visibility ratio within the students' effective range of visibility is studied based on graph theory, which can assess the safety level of public space in a quantitative way. Through this method, 42 primary and secondary schools were used to investigate to get the value of natural visibility ratio, and which was used to analyse the natural visibility level of those schools. The results show that natural visibility ratio can quality identify potential unsafe factors in campus. There is a strong negative correlation between campus average natural visibility ratio and building density. Therefore, the natural visibility ratio is beneficial to quality and objectively evaluate the safety of the campus, and to improve campus planning and design by predicting the level of visibility in public space
The making of Gondwana: discovery of 650Ma HP granulites from the North Lhasa, Tibet
No full textAbstract not availableZeming Zhang, Xin Dong, Feng Liu, Yanhao Lin, Rong Yan, Zhenyu He, M. Santos
Dunhuang shi shi yi shu /
No full textFeng mian you Luo Zhenyu shou ji.v. 1 Shang shu gu ming [can ben]. Sha zhou zhi [can juan]. Xizhou zhi [can juan]. Hui chao wang wu Tianzhu guo zhuan [can juan]. Wen quan ming. -- v. 2 Sha zhou wen lu / Jiang Fu ji. -- v. 3 Ban ruo bo luo mi duo xin jing / Jiang Fu ji. Laozi hua hu jing [can juan]. Wutai shan sheng jing zan / Xuan ben shu. Moni jing [can juan]. Jing jiao san wei meng du zan. Sha zhou shi shi wen zi ji.Mode of access: Internet
sj-docx-1-jet-10.1177_15266028231208646 – Supplemental material for Drug-Coated Balloon Angioplasty of Infrapopliteal Lesions in Chronic Limb-Threatening Ischemia: Six-month Outcomes of PRIME-WIFI
No full textSupplemental material, sj-docx-1-jet-10.1177_15266028231208646 for Drug-Coated Balloon Angioplasty of Infrapopliteal Lesions in Chronic Limb-Threatening Ischemia: Six-month Outcomes of PRIME-WIFI by Julong Guo, Meng Ye, Wei Zhang, Ziheng Wu, Zibo Feng, Xin Fang, Qiang Li, Hongfei Sang, Zhenyu Shi, Weihao Shi, Chunshui He, Xixiang Gao, Jianming Guo, Zhu Tong, Yongquan Gu and Lianrui Guo in Journal of Endovascular Therapy</p
Rational solutions of ordinary difference equations
No full textAbstractIn this paper, we generalize the results of Feng and Gao [Feng, R., Gao, X.S., 2006. A polynomial time algorithm to find rational general solutions of first order autonomous ODEs. J. Symbolic Comput., 41(7), 735–762] to the case of difference equations. We construct two classes of ordinary difference equations (OΔEs) whose solutions are exactly the univariate polynomial and rational functions respectively. On the basis of these OΔEs and the difference characteristic set method, we give a criterion for an OΔE with any order and nonconstant coefficients to have a rational type general solution. For the first-order autonomous (constant coefficient) OΔE, we give a polynomial time algorithm for finding the polynomial solutions and an algorithm for finding the rational solutions for a given degree
Effect of N Doping on Microstructure, Mechanical and Tribological Properties of V-Al-C Coatings
No full textThe crises of resource shortage have prompted ocean exploitation to spring up all over the world. Some crucial frictional components of marine equipment have to be directly faced with the conjoint action of wear and corrosion. Transition metal nitrides or carbides hard coatings have been widely used to improve tribological performance in various applications. However, the poor toughness, wear and corrosion resistance of coatings cannot meet the harsher marine environment, which needs to obtain multi-functional hard coatings providing complex properties. The nanocomposite structure coatings containing nanocrystalline phase embedded in an amorphous matrix allow tailoring their properties to desired value by designing chemical composition and nanostructure. In this work, V-Al-C and V-Al-C-N coatings were deposited on silicon and high speed steel (HSS) substrates by magnetron sputtering. The crystal microstructure, chemical composition, surface morphology, cross-sectional structure, mechanical property and friction behavior of the coatings under different contact conditions (air, distilled water and artificial seawater) were studied by XRD, XPS, SEM, nano-indentation and ball-on-disc tribometer. The results showed that the V-Al-C coating displayed columnar structure with coarse grain. When the nitrogen was incorporated, the coating structure evolved into nanocomposite structure composed of nanocrystallite and amorphous carbon. The hardness increased from (14 +/- 0.48) GPa to (24.5 +/- 0.8) GPa, and the toughness was significantly improved (H/E>0.1). In air condition, the friction coefficient decreased from 0.70 to 0.42, owing to the synergy interaction between V2O5 and amorphous carbon during sliding. The friction coefficients of the both coatings in distilled water and artificial seawater were lower than those in air owing to the boundary lubrication forming lubricative film by absorbed water. The friction coefficient in seawater was lower than those in distilled water, resulting from the formation of Mg(OH)(2) and CaCO3 during sliding. However, the wear rates of the both coatings in artificial seawater were larger than that in distilled water, which demonstrated a synergism between corrosion and wear in artificial water. The V-Al-C coating was all worn out under different contact conditions owing to severe abrasive wear, while the V-Al-C-N coating showed better wear resistance, with a wear rate of 3.0x10(-16) m(3)/(N center dot m) in air and 1.4x10(-15) m(3)/(N center dot m) in artificial water, respectively
Deterioration mechanism of adhesion properties of FRP-soil interface induced by moisture
No full textThe deterioration of FRP-soil interfacial adhesion due to water intrusion has been a core issue in geotechnical engineering, but its microscopic mechanism remains unclear. In this study, molecular dynamics (MD) simulation method is employed to reveal the microscopic deterioration mechanism of water on adhesion properties of epoxy-quartz (i.e., FRP-soil subsystem) interface, the structural and dynamic characteristics of interlayer water film. The steered molecular dynamics (SMD) pulling simulation and the modified Bell’s model are used to evaluate the adhesion energy of epoxy-quartz interface in dry and wet cases. The simulation results show that (1) the interfacial water film weakens adhesion strength of epoxy-quartz interface, playing a dual role in “interface isolation” and “lubrication”, aggravating the interfacial debonding. (2) The work of adhesion, maximum pulling force, PMF, and adhesion energy of dry system are significantly higher than those of wet system. (3) The interlayer water film has a distinct layered structure: bound, free, and sparse water layers, which have different angle orientations and density distributions. (4) The diffusion coefficient increases with the rising thickness of free water layer, which may trigger a capillary-seepage effect and aggravate interface deterioration. This study provides atomic-scale insights into moisture-induced FRP-soil interface failure mechanism.The presentation of the authors' names and (or) special characters in the title of the pdf file of the accepted manuscript may differ slightly from what is displayed on the item page. The information in the pdf file of the accepted manuscript reflects the original submission by the author
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