科学家与计量学命名——一个公式与三个科学家

电学中有这么一条公式,它尤如一条纽带把不同国度的三位科学家联结了起来。它,就是欧姆定律的表达式,I=V/K。式中电流 I 的单位定为安培(A),是为了纪念法国物理学家安培在研究电流时所作的贡献;电压的单位定为伏特(V)是因为意大利物理学家伏特于1799年发明了伏特电池。但这里更值得一提的     

PLC步进指令在龙门点焊机改造中的应用

介绍了可编程序控制器（PLC）步进指令在龙门点焊机中的应用，不仅使程序设计简单，程序可读性强，而且运行可靠，调试方便，显示了步进指令的特点。     

欢迎订阅2001年《化工矿物与加工》

《化工矿物与加工》系国家科委批准国内外公开发行的国家级刊物 ,为全国中文核心期刊。国内统一刊号 :CN132— 14 92 /TQ;国际标准刊号 :ISSN10 0 8-75 2 4,国内邮发代号 2 8-5。主要报道化工矿产品 (磷、硫、钾、硼等 )和相关非金属矿产品的开采、加工技术 ,以及这些产品的延伸产品 (磷肥、钾肥、复混肥等 )的生产技术和市场信息等。本刊为月刊 ,大 16开本 ,每期定价 5元 ,全年定价 6 0元。订户可到当地邮局订阅 ,或直接汇款到本刊编辑部订阅 ,也可向本刊编辑部函索订单订阅。本刊同时经营广告业务 ,欢迎刊登广告。刊址 :江苏连云港市…     

Control of LP Turbine Rotor Blade Underloading Using Stator Blade Compound Lean at Root

IntroductionLP turbines operate over some range of flow regimeson both sides of the nominal operating conditions. Acharacteristic feature of LP tUrbines are strong radial gradients of pressure, Mach number and flow angle, especially downstream of the stator, Where these gradientsdetechne inlet now conditions for the moving bladerow. The changing swirl velocity and swirl angle spanwise require considerable twist of the rotor blades. Forlow loads, low pressures at the inlet to the rotor at th…     

The Principle and Reflection on Determining the Mails'''' Whole Delivery Standard of Time Bound in the Postal Central Office System

1　ＩｎｔｒｏｄｕｃｔｉｏｎＣｈｉｎｅｓｅｐｏｓｔａｌｓｅｒｖｉｃｅｗｉｌｌｃｏｎｔｉｎｕｅｄｅｖｅｌｏｐｉｎｇａｒｏｕｎｄｉｎｔｈｅ ｐｅｒｉｏｄｏｆｔｈｅＴｅｎｔｈｆｉｖｅ ｙｅａｒｐｌａｎ(2 0 0 1 - 2 0 0 5) .Ｃｈｉｎａｐｏｓｔｗｉｌｌｐｕｔｆｏｒｗａｒｄａｓｅｒｉｅｓｏｆａｄｊｕｓｔｍｅｎｔｓａｂｏｕｔｍａｉｌｓ ｃａｔｅｇｏｒｉｅｓａｎｄｔｈｅｓｔｒｕｃ ｔｕｒｅｏｆｐｏｓｔａｌｃｏｍｍｕｎｉｃａｔｉｏｎｎｅｔｗｏｒｋｓｉｎｏｒｄｅｒｔｏｉｍｐｒｏｖｅｔｈｅｐｏｓｔａｌｃｅｎｔｒａｌｏｆｆｉ…     

Production of dileptons with intermediate masses in an expanding quark-gluon matter

1 INTRODUCTIONIn recent years, both the HELlOS-3 and NA38/NA50 Collaborations have observedenhancement of the dilepton yield in the IMR (between aam and about 2.5 GeV) incentral S W and S U collisions as compared to that in proton-induced reactions. Preliminary data from the NA50 Collaboration also show significant enhancement, i.e., incentral Ph Pb .ollisions.111 There are at least three possible sources for this enhancement: the contribution from initial charmed hadronic decays…