共查询到20条相似文献,搜索用时 49 毫秒
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1994年机床进出口均见增长中国机床总公司谢光亮从海关公布的1994年进出口机床(含金属切削机床和金属成型机床)数字可看出我国机床进口和出口都超过1993年(见下表)。1993~1994年我国机床进出口数字对照和增长率表1994年进口机床金额突破20... 相似文献
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2005年10月,康明斯将全球董事会移师中国.这是15年以来,康明斯全球董事会第一次在北美以外的地方召开,体现了飞速发展的中国市场在康明斯全球布局中日益重要的战略地位. 相似文献
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2005年10月,康明斯将全球董事会移师中国。这是15年以来,康明斯全球董事会第一次在北美以外 的地方召开,体现了飞速发展的中国市场在康明斯全球布局中日益重要的战略地位。 2004年,康明斯在中国的营业额突破10亿美元,占康明斯全球业务的1/10以上,中国已成为康明斯 美国本土以外规模最大、增幅最高的海外市场。 作为50马力以上全球最大的独立柴油机制造商,康明斯堪称跨国发动机企业在华落地生根的一个典范。 康明斯在华业务的巨大成功,已经成为这家跨国发动机企业称雄美国华尔街股市的“独到亮点”。 康明斯中国30年的发展,可以说是这家世界著名的跨国企业80多年发展历史的一个缩影 相似文献
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今天,DCS的结构体系已经从以系统为中心发展为以业务过程为重点,并帮助过程行业获得卓越的运行效率。 相似文献
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20世纪80年代,有机氯农药逐步结束了它的历史使命,退出了化学农药的舞台;而有机磷农药已经被大量使用,方兴未艾,如火如荼,成为化学农药的依赖体系;菊脂类农药刚刚兴起,不断地扩大应用领域;杀菌剂80%依赖于进口;化学除草剂还没有被人们充分认识和使用,植物生长调节剂多半局限在学术交流和文字材料中;生物农药对于北方农业来讲还是非常陌生和遥远的名词。 相似文献
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A. A. Koptelov 《Instruments and Experimental Techniques》2003,46(3):430-433
A calorimetric method is developed to study the thermokinetics of radiation-chemical processes (RCPs). The samples under study are heated by gamma radiation absorbed in the adiabatic mode. The developed method allows the minimum level of reliably detected thermal effects of RCPs to be decreased by more than an order of magnitude as compared with conventional calorimetric methods. The calorimetric system is also virtually free from the time lag typical of the majority of dynamic calorimeters. These advantages allow the kinetics of reactions with rather low radiation-chemical yields to be studied immediately during irradiation. 相似文献
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Eliezer Pereira Lopes Elizeu Pereira Lopes 《Sensing and Imaging: An International Journal》2010,11(1):15-31
An iterative algorithm is described to solve the inverse problem of stratified media using magnetic field data collected in
aerial surveys. An airborne antenna sends downwards magnetic fields at several frequencies, and an airborne antenna detects
the secondary magnetic fields. The input data for the inversion algorithm are the complex ratios between the secondary and
primary magnetic fields at different frequencies. The algorithm selects one value for each unknown in ranges where the solution
is likely to lie. Complex residuals between experimental and estimated data are computed. A cost function is defined as the
summation of the absolute values of the real parts of the residuals added to the summation of the absolute values of the imaginary
parts of the residuals. A value of the cost function is computed for the selected set of values of the unknowns. All such
procedures are repeated for other sets of values of the unknowns. Such sets span the ranges of values where the solution is
deemed to lie. The solution in the first iteration is the set of values of the unknowns that relates to the minimum computed
value of the cost function. In each subsequent iteration, a minimization of the cost function is performed around the solution
estimated in the immediately preceding iteration. The final solution relates to the minimum value of the cost function over
all the iterations. The inverse problem is solved without recourse to either analytical or numerical computation of derivatives.
This provides stability and simplicity to the algorithm. The MATLAB code of the algorithm is set forth. The code is assessed
using field data from two aerial magnetic surveys. 相似文献
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We present a model for calculating the friction at the head/tape interface as a function of wrap angle, tape speed, tension and head dimensions. The model is based on the Euler–Bernoulli beam equation and the Reynolds equation. Several refinements relative to previous implementations are introduced: specifically a multi-coefficient slip-flow correction is implemented to deal with the reduction of spacing, the skiving-edge profile is modeled using interferometer microscope measurements to account for edge rounding, and the tension asymmetry due to friction is accounted for. Results from the model are compared with experimental measurements of friction versus wrap angle and tape velocity. The model and the experiment show excellent agreement under the range of conditions studied. 相似文献
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介绍了高速切削工艺研究的六项主要内容,在进行高速切削时应重点考虑的九个方面的内容和需要采取的措施.对在生产中更好的发挥高速切削机床的作用具有借鉴意义. 相似文献
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搞好质量认证工作和确保质量体系的有效运行必须具备一定的条件,并在认证过程中注意几种不正确的倾向,只有这样才能使ISO9000标准得到正确的推广和实施。 相似文献
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我厂煤气排送机原动机为1 000kW电机,通过增速器带动风机旋转,将煤气输送至氧化铝焙烧炉. 2000年4月,4#排送机大修时更换了增速器的大小齿轮.在调整增速器的过程中,按设计要求应通过保证齿轮轴的水平度和平行度实现齿轮副正确啮合与传动,但调整新齿轮水平度达不到要求. 相似文献
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检测实验室仪器设备管理的几点体会 总被引:1,自引:0,他引:1
本文主要从加强采购针对性和计划性、提高使用水平、加强维护与维修以保障正常运行、科学分类管理、加强质量体系文件规范化和可操作性、信息化等方面出发,就检测实验室如何加强仪器设备管理方面阐述了几点体会,以期建立起职责明确、流程清晰、管理规范的仪器设备管理体系,确保检测过程实验仪器的运行正常和实验数据的准确可靠。 相似文献