发挥桥梁纽带作用 促进转型升级战略——写在2006中国国防科技工业制造技术装备采购洽谈会暨中国国防科技工业自主创新论坛之后

由中国国防科技工业企业管理协会与陕西省国防科工委和中国贸易促进委员会陕西省分会于2006年4月26-28日在西安陕西国际展览中心共同举办了“2006中国国防科技工业制造技术装备采购洽谈会”(本文简称“采购洽谈会”)。同期,中国国防科技工业企业管理协会与陕西省国防科工委在西     

第二届中国国防科技工业制造技术装备采购洽谈会在西安开幕

日前，由中国国防科技工业企业管理协会、中国生产力学会和陕西省国防科学技术工业委员会共同主办的第二届中国国防科技工业制造技术装备采购洽谈会在西安隆重开幕。     

双良集团总裁缪双大获中国工业军旅功勋人物

日前,以"转方式调结构,打造高端制造业"为主题,由工业和信息化部为指导单位,中国国际经济交流中心为特别支持单位,中国工业经济联合会为支持单位,中国工业报社、中共中央党校党建部和中国国防科技工业企业管理协会共同举办的第7届中国工业论坛在北京召开。论坛同     

第七届中国工业论坛在京召开

由工业和信息化部作为指导单位．中国国际经济交流中心为特别支持单位,中国工业经济联合会作为支持单位;由中国工业报社、中共中央党校党建部、中国国防科技工业企业管理协会等单位共同举办的中国工业论坛于4月16—17日在北京召开。     

中国国防科技工业信息化高峰论坛在京举办

中国国防科技工业信息化高峰论坛近日在北京召开,国防科工委原副主任、中国和平利用军工技术协会理事长于宗林、工业和信息化部信息化推进司产业     

中国西部国际制造业博览会将办

中国西部国际装备制造业博览会将于 2 0 0 3年 3月 10— 13日在西安国际展览中心举办。这届展会对于加强东西部合作 ,推动西部大开发 ,促进西部装备制造业快速发展和经济的全面复兴将具有十分重要的意义。展会由西安市人民政府主办 ,陕西省经贸委、陕西省国防科工委、陕西省科协联合主办 ,西安市商贸委、陕西省机械行业办、陕西省模具工业协会、陕西省机械工程学会协办。西安会展办和西安三联科技会展公司承办。展会期间主要活动有 :中国西部国际装备制造业博览会、西部装备制造业论坛、中外 (美、日、韩 )装备制造业西部合作论坛、制造业招…     

装备制造业展示新技术和新产品的国际盛会——2006年中国国际工博会鸟瞰

在上海已经连续成功举办七届的上海国际工业博览会经国务院批准,从2006年起正式更名为"中国国际工业博览会"(简称"中国工博会").     

《国防科技工业企业标准化集成管理系统》《国防科技工业基础标准工具软件包》两项目通过鉴定

《国防科技工业企业标准化集成管理系统》、《国防科技工业基础标准工具软件包》两个项目鉴定会于2004年8月22日在北京召开，会议由国防科工委主持，国家标准化管理委员会石保权副主任、国家科技部高新司王春恒处长和国防科工委科技与质量司马恒儒副司长到会并讲话。中国科学院徐性初院士任鉴定委员会主任，19个单位的40名专家参加了会议。2004年8月23日国防科技工业标准化研究中心召开了该两个软件的成果推介会。     

PDM航空工业信息化发展的基石——访陕西省国防科技工业信息化协会理事长、西安飞机工业(集团)有限责任公司副总工程师王泽玉

在古城西安,记者再次见到了陕西省国防科技工业信息化协会理事长、西安飞机工业(集团)有限责任公司副总工程师王泽玉,其实这已经不是第一次见面了,这次恰逢王泽玉在放高温假,采访的过程中更像是在叙旧聊天,平添了几分的轻松和坦城.     

2010中国现代农业装备国际展览会日程安排

<正>我们诚挚的邀请您参观将于2010年3月29-31日在南京国际展览中心举办的"2010中国现代农业装备国际展览会暨国际农业机械合作与发展论坛"(以下简称全国农装展)。本届全国农装展是由中国机械工业联合会、中国农业机械工业协会、江苏省农业机械管理局和南京市人民政府共     

Collision between a ring and a beam

With car–parapet collision accidents in mind, a normal collision between a free-flying half ring and a simply supported beam with/without axial constraints is studied, in which an elastic–plastic half ring with an attached mass and the elastic–plastic beam are taken as the simplest models of a car and a parapet, respectively. Particular attention is paid to the energy partitioning between the two structures and the evolution of the contact regions during collision. A mass–spring finite difference (MS–FD) model is employed whilst the large deflection and axial stretching/compression are incorporated. The numerical results show that the less stiff (i.e. softer) structure will dissipate more energy and the contact regions will move away from the initial contact points. With the increase of the relative thickness of the beam to the ring, the final deformation of the half ring will transform from a “U” shape to a “W” shape.     

Contact Temperature of a Cuff and a Rotating Shaft

Russian Engineering Research - Experimental apparatus is developed for investigating the influence of cuff heating in frictional contact with a rotating shaft. Empirical formulas for the...     

Thermoelastic contact of a rotating sphere and a half-space

An approximate solution is given for the thermoelastic contact problem in which a rotating sphere is loaded against a half-space. Frictional heating causes a redistribution of contact pressure away from the axis of rotation. The contact radius falls with increasing rotational speed, whilst for a given speed there is a limiting value which the radius cannot exceed, no matter how high the load.     

离子色谱法同时测定梨子和梨树叶中的氯和硫

提出了梨子和梨树叶的消解方法。采用离子色谱电导检测法同时测定梨子和梨树叶中的氯和硫 ,方法检出限梨子和梨树叶中的Cl分别为 0 .3× 10 -6,6× 10 -6,梨子和梨树叶中的S分别为 0 .9× 10 -6,18× 10 -6;回收率为92 .0～ 10 2 .0 % ,RSD(n =10 ) 1.4 2～ 9.93%。     

Resonance energy transfer between a spherical nanoparticle and a J-Aggregate

This paper describes the nonradiation (Forster) energy transfer between a dye J-aggregate and closely located nanoparticles possessing the properties of two-level systems. Nanoparticles can be quantum dots (QDs) or a spherical symmetric package of atoms. The dynamics of the process is described by deriving the equations that characterize the density matrix dynamics in a two-level medium and the evolution of exciton pulses in an extended quasi-one-dimensional dye J-aggregate. It is shown that effective controlled resonant transfer of the energy stored in QDs is implemented in the system and manifested in the amplification of the exciton pulses. In turn, there is a possibility of the reverse process of exciton energy transfer in partial inversion of two-level transitions of QDs. The results of this paper are confirmed by the experimental data from the literature.     

Slipping Friction of a Powder Coating and a Metallic Counterbody

Russian Engineering Research - The frictional surface of wear-resistant coatings modified by ultradisperse spinels CoAl2O4 and CuAl2O4 is studied by metallographic and profilometric analysis in the...     

Positioning and Orienting a Drill Axis on a Curved Surface

A novel technique, referred to as a vector setting in the aerospace industry, has been developed for positioning and orienting drilling bushes on curved surfaces. The position and orientation of holes and their axes in parts and tooling in the aerospace industry must conform to strict tolerances; however, the process of locating and orienting the bushes in drilling plates having curved surfaces is slow and time consuming. This is because the existing process used is a trial and error one, and past research in automated drilling in the aerospace industry has not covered this area. A prototype device has been developed which reduces the setting time. The device has two angular adjustments, which are computed using specially written software. The device is used in conjunction with a 3D spatial measurement system in order to determine reference points on the part or tooling and the device. Experimental results on a prototype indicate a substantial time saving as well as good accuracy in orienting the drill axis at a given point on a surface.     

Contact between a circular plate and a tensionless edge support

In this paper the extent of contact between a circular plate and its tensionless edge support is studied. The solution is obtained by employing the Ritz method. The displacement function is approximated in terms of the functions which satisfy exactly one of the boundary conditions. The other boundary condition is satisfied approximately by taking the harmonic average. The numerical results showing the effects of the configuration of loading and the stiffness of the support on the extent of the contact and on the edge displacement of the plate are presented in various diagrams. The results which correspond to a very low support stiffness are compared with those of a rigid plate, and very good agreement is found.     

机器人坐标系与激光跟踪仪坐标系的快速转换方法

针对机器人坐标系与激光跟踪仪坐标系的转换问题,提出一种机器人单轴旋转运动与自身读数相结合的方法。将靶标球安装在机器人末端,用激光跟踪仪实时测量球心坐标,对机器人单轴转动产生的圆弧轨迹进行空间圆拟合,由三个空间圆的单位法向量可得到旋转矩阵。再求取球心初始位置相对于机器人默认工具点的坐标偏移量,便可反推机器人坐标系原点在激光跟踪仪坐标系下的坐标,即平移向量。实验结果表明,转换后空间点X、Y、Z坐标的RMS误差分别为0.216 mm、0.111 mm、0.157 mm。