德国潜艇用USK800系列电子支援测量系统

介绍德国现役潜艇用USK800系列电子支援测量系统的结构和性能特点以及技术数据。     

Localized shear deformation during shear band propagation in titanium considering interactions among microstructures

Closed-form analytical solutions of plastic shear strain and relative plastic shear displacement during shear band propagation are proposed under dynamic loadings based on gradient-dependent plasticity considering the effect of microstructures due to heterogeneous texture of Ti. According to the differences in shear stress levels, Ti specimen is divided into three regions: residual region, strain-softening region and elastic region. Well-developed shear band is formed in the residual region and the relative plastic shear displacement no longer increases. In the normal and tangential directions, the plastic strain and the displacement are nonuniform in the strain-softening region.At the tip of shear band, the shear stress acting on the band is increased to shear strength from the elastic state and the shear localization just occurs. Prior to the tip, Ti remains elastic. At higher strain rates, the extent of plastic strain concentration is greater than that under static loading. Higher strain rate increases the relative plastic shear displacement. The present analytical solution for evolution or propagation of shear localization under nonuniform shear stress can better reproduce the observed localized characteristics for many kinds of ductile metals.     

日本开发出计算机单手键盘

日本富士通研究所和信浓富士通公司合作开发出一种新型计算机键盘。 该键盘形式一张10厘米见方的卡片,重量只有100克,字符键共有14个,英文字母除“A”、“E”各单独占1个键之外,其它均2个字母占1个键,如“P”和“N”,“U”和“D”,“C”和“T”等各占1个键。 输入时只用除大拇指以外的4指,单手操作即可,输入方式带有模糊逻辑,是一种模糊输入。例如当你打     

2015“艾普兰奖”揭晓

<正>3月11~14日,中国家电行业年度大奖"艾普兰奖"颁奖典礼在上海举行。卡萨帝双滚筒分洗洗衣机C8 U12W3、夏普8K液晶电视、三星SUHD液晶电视UA65JS9800JXXZ、LG冰箱M23HWCHL、海尔冰箱BCD-630WBGUU1、A.O.史密斯电热水器EWH-E9W、美的IH电饭煲MBFZ4086、方太云魔方油烟机CXW-200-EM01T共8款年度新品历经多轮审核,在众多申报产品中脱颖而出,夺得"艾普兰大奖"。据悉,艾普兰奖分为专业评审类奖项和大众评审类奖项,除艾普兰大奖外,专业评审类奖项还设有创新奖、环保奖、设计奖、产品奖和针对零部件的"核芯奖";     

Mutagenesis and selection of high efficiency hydrogenproducing mutants by ultraviolet radiation

Energy sources are extremely important for theworld to survive, develop and prosper. At present, fos-sil fuels are the major global energy resource but theycause environmental problems during combustion, suchas global warming and acid rain, which have started toaffect the earth’s climate, weather condition, vegeta-tion and aquatic ecosystems, as well as creating serioushealth issues[1 -3]. Considering the energy security andthe global environment, there is a pressing need to ex-ploit new non-…     

T-Connect S-2400 USB接收机——小巧、玲珑、多功能

当今,个人电脑已经成为我们家庭中必要的组成部分。它们越来越多的被当作多媒体应用中心,比如:作相册,存储音乐等等。新的理念是在下一步的技术革新中使用它们来观看卫星数字电视。     

波段双电子注相对论返波振荡器的粒子模拟

首次提出了由双电子注同轴相对论返波管来产生双频微波输出,采用2.5 维相对论全电磁PIC 粒子模拟软件,进行粒子模拟研究。结果表明在环形相对论电子注电压625kV,电流24kA,引导磁场0.772T 的条件下,器件得到了稳定的高功率双频微波输出。其双频微波频率分别为11.5GHz 和12.2GHz,两频率相差700MHz,平均功率约为1.15GW,平均功率效率7.7%。     

干热岩增强型地热系统平行三裂隙传热影响因素分析北大核心CSCD

干热岩作为可再生能源,其有效开采途径是形成干热岩增强型地热系统,而建立干热岩增强型地热系统首先要通过水力压裂,在岩石间形成裂隙,其中压裂尺寸和工况参数均对传热产生影响。文章建立二维平行三裂隙模型,采用商业软件进行数值模拟计算,分析压裂尺寸和工况参数对传热的影响。结果表明:当工况参数一定时,不同压裂尺寸对传热的影响程度由高到低依次为裂隙宽度,裂隙长度,岩石开采宽度;当裂隙尺寸一定时,不同工况参数对传热的影响程度由高到低依次为进口水温,进口水流量,岩石初始温度。因此,根据生产生活需要,恰当改变压裂尺寸或工况参数,可以延长干热岩增强型地热系统使用寿命,节约施工成本。