计算机综合自动化制造系统CIMS的结构与概念

ＣＩＭＳ是近来发展起来、在制造业中的一种计算机应用系统，它把各种有关的子系统有机地综合成一个完整的系统，从而更有效地提高制造过程的质量与效率。它是一种多层次，多阶段和多模式的复杂系统，不仅对系统中的物质流进行有效地控制，还对信息流进行综合与控制，并把系统优化空间扩展到设计、检验和市场。传统方法和人工智能相结合是处理这种复杂系统的有效方法。     

Application of adaptive filtering by selecting the parameter weight factor in precise kinematic GPS positioning

A new method of adaptive filtering by selecting the parameter weight factor is introduced in this paper. Based on the theoretical analysis and research, this method is firstly used for precise kinematic GPS positioning with single frequency double-differenced (DD) carrier phase observations. Two numerical examples are given to illustrate the feasibility and validity of the method. The preliminary results show that precise positioning results can be obtained by using only the GPS single frequency DD carrier phase measurements for short baselines with the new method.     

Initiating, growing and cracking of hydrogen blisters

The growing process of a hydrogen blister in a wheel steel was observed in situ with an optical microscope, and the fracture surfaces formed from broken blisters on a wheel steel and bulk metallic glass were investigated. The initiating, growing, cracking and breaking of hydrogen blisters are as follows. Supersaturated vacancies can increase greatly during charging and gather together into a vacancy cluster （small cavity）. Hydrogen atoms become hydrogen molecules in the vacancy cluster and hydrogen molecules can stabilize the vacancy cluster. The small cavity becomes the nucleus of hydrogen blister. The blister will grow with entering of vacancies and hydrogen atoms. With increasing hydrogen pressure, plastic deformation occurs first, the hydrogen blister near the surface extrudes, and then cracks initiate along the wall of the blister with further increasing hydrogen pressure. A cracked blister can grow further through propagating of cracks until it breaks.     

RNAi-mediated knockingdown of rlpk2 gene retarded soybean leaf senescence

Leaf senescence that occurs in the last stage of leaf development is a genetically programmed process. It is very significant to elucidate the molecular mechanisms that control the initiation and progression of leaf senescence and the way the senescence signal is transduced. In a previous study on artificially induced soybean leaf senescence, we cloned a novel gene designated rlpk2 (Genbank Accession No. AY687391) that encodes a leucine-rich repeat (LRR) receptor like protein kinase. The expression level of rlpk2 gene was shown to be strongly up-regulated during both the natural leaf senescence process in this report and the artificially induced primary-leaf-senescence process in our previous work. The RNA interference (RNAi)-mediated knocking-down of rlpk2 dramatically retarded both the natural and nutrient deficiency-induced leaf senescence in transgenic soybean. The transgenic leaves showed more cell-aggregated surface structure and higher content of chlorophyll.     

分子导线：半导体性-金属性组合的双壁纳米碳管

由于双壁纳米碳管独特的双层结构,可望在纳米器件领域得到广泛应用。如根据构成两层碳管的导电性不同,可用作分子导线和记忆功能的分子存贮器等纳米电子器件,并可用作分子轴承、分子马达、超高频分子振荡器等纳米机械器件。同时,双壁纳米碳管的双层结构也为研究层间作用力对声子和电子结构的影响提供了理想的平台。但是迄今为止,所制备的双壁纳米碳管由于纯度低、无序排列和直径分布较宽的特点,严重阻碍了对其深入的理论研究和实际应用。沈阳材料科学国家(联合)实验室先进炭材料研究部任文才等于2002年率先提出了流动催化剂化学气相沉积法用…     

喀纳斯河大桥方案设计

喀纳斯河大桥是一座旅游风景区内集交通功能和景观功能于一体的桥梁。文中通过对其方案的设计理念、指导思想的综述,提出两个设计方案并进行比较。     

谈沥青混凝土路面平整度控制措施及提高对策

针对沥青混凝土路面不平整的产生原因,提出了提高路面平整度的技术、路面平整度控制措施及路面不平整应采取的相应对策。     

组合变形梁危险截面

从教学角度通过计算对危险截面位置的确定,并对其进行了证明。     

Large-scale low-frequency rainfall regimes and their transition modes in summertime over China

It is well known that the predictable period of daily weather is generally within 2-3 weeks, so spatio-temporal mean predictands have to be employed in the monthly, seasonal, and annual predictions. At present, rainfall patterns (RPs)[1-5] are the key for…