最近几年,身边有很多朋友都热衷于出国自由旅行,即出发前预订好机票酒店,办好签证.到了目的地自行住宿吃饭游览,没有密集的行程和紧凑的发排.更避免了勉强或强制消费.可以随我所愿任
Wake structures and vortex induced vibration(VIV) of a spring-supported wide-D-section cylinder were experimentally investigated using an X-wire,a novel phase-l
The thermal protection performance of superalloy honeycomb structure in high-temperature environments are important for thermal protection design of high-speed
负责自主研发地理信息系统(GIS)的北京超图软件股份有限公司有关负责人表示,结合气象、水文、排水管网等多部门信息的降雨智能预警处置系统GIS目前正在研发过程中,
<正>Fracture is a leading subject full of revolutionary and discipline penetration in a diversity of fields,e.g.,mechanics,materials science,physics,medicine,me
To understand the ‘‘elastic softening’’ of Li–Si alloys for the development of Li-ion batteries, the effect of stress-induced change of entropy on the mech
A novel method for modeling cellular materials is proposed based on MATLAB image processing and synchrotron X-ray computed tomography scanning to obtain an accu
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The problem of boundary layer flows at a flat plate surface with velocity-slip and temperature-jump boundary conditions is analyzed.With the velocity slip condi
我国古代一些有远见的政治人物,很早就注意到了防灾减灾与治理国家的密切关系。早在春秋时期,春秋五霸之一的齐桓公曾向丞相管仲请教治国之道,管仲回答说:"故善为国者,必先除其