排序方式: 共有25条查询结果,搜索用时 15 毫秒
1.
2.
《粉末冶金学》2013,56(2):200-204
AbstractThe atomising gas pressure is one of several important process parameters that affect the characteristics of the powder particles. The work analyses qualitatively the influence of the atomising gas pressure on 63A solder alloy fine powders. Also studied was the mechanism of the effect of the atomising pressure on the base of the air dynamics through the atomising 63A solder alloy experiment with different atomising pressures on the supersonic nozzle. The results indicate that 63A solder alloy fine powders may be attained, which can satisfy the SMT application requirement when the atomising gas pressure is at 0.7 MPa. 相似文献
3.
《粉末冶金学》2013,56(1):99-104
AbstractThis paper reviews the mechanical and microstructural characteristics of hypoeutectoid steels obtained by powder technology, in which various carbonaceous petroleum products provide the carbon constituent. These steels are compared with others of similar composition obtained from graphite. 相似文献
4.
5.
《International Heat Treatment & Surface Engineering》2013,7(2):53-59
AbstractThe large state-owned enterprises in China have achieved great progress in heat treatment production technologies over the last 10 years. In addition, the number of smaller commercial heat treatment plants has increased rapidly to more than 3000. Heat treatment plant and equipment manufacturing flourishes. However, because China covers a vast territory with uneven regional development, and consequently little uniformity across the individual enterprises, there are still obvious gaps compared with the advanced level globally. Therefore the 11th Five-Year Plan for the heat treatment industry, formulated by the China Heat Treatment Association (CHTA) and the Chinese Heat Treatment Society (CHTS) prioritises equipment renovation as the way ahead for production technology innovation. Based on a nation-wide survey, the 11th Five-Year Plan described the current status, identified the shortcomings, formulated the guiding principles and directions for development, and put defined key R&D initiatives and other measures for achieving progress. A vision up to 2020 was set out. 相似文献
6.
《钢铁冶炼》2013,40(4):295-299
AbstractAn overview is given of roll developments and experience in the context of hot mills and flat rolled products. After 30 years of slow change, there are now strong productivity and quality incentives driving developments in roll technology. International developments are noted, in particular the acceptance that high speed steel (HSS) rolls must be used to meet current surface finish requirements. The most significant need at present is for an improvement of late stand work rolls. 相似文献
7.
Tobias Preckel Gerd Luedke Samuel D. H. Chan Benjamin N. Wang Robert Dubrow Carsten Buhlmann 《Journal of The Association for Laboratory Automation》2002,7(4):85
Lab-on-a-chip technology achieves a reduction of sample and reagent volume and automates complex laboratory processes. Here, we present the implementation of cell assays on a microfluidic platform using disposable microfluidic chips. The applications are based on the controlled movement of cells by pressure-driven flow inside networks of microfluidic channels. Cells are hydrodynamically focused and pass the fluorescence detector in single file. Initial applications are the determination of protein expression and apoptosis parameters. The microfluidic system allows unattended measurement of six samples per chip. Results obtained with the microfluidic chips showed good correlation with data obtained using a standard flow cytometer. 相似文献
8.
《Materials Science & Technology》2013,29(9):1049-1055
AbstractA typical industrial hot rolling operation applied to a commercial Al–1%Mg alloy has been analysed in terms of some concepts from dynamic materials modelling (DMM), particularly the so called dissipator co-content J and the efficiency of power dissipation through microstructural changes η. The calculation of the parameter η for every deformation condition of the hot rolling schedule has been conducted assuming that this variable depends not only on the mean deformation temperature and strain rate but also on the strain applied to the material. All the analysis has been conducted on the basis of a constitutive equation previously determined for this material on a rational basis, which is capable of describing the strain, strain rate, and temperature dependence of the flow stress. It has been determined that, for this material, η can be significantly dependent on strain under certain deformation conditions, particularly low deformation temperatures and relatively high strain rates. It has also been shown that for the materials analysed, η is much more dependent on deformation temperature than on strain rate. A comparative analysis carried out with aluminium of various purities indicates that η is much lower for the alloy when it is deformed under similar conditions. In this sense, it has been suggested that such results could be interpreted in terms of the impurity content of the material and the interaction of the alloying atoms with the dislocation structure developed during high temperature deformation. However, this is only possible if the hypothesis advanced by Prasad and co-workers, that the power dissipation efficiency is associated with the dynamic microstructural processes that occur during deformation, is considered valid. The present results indicate that, contrary to previous findings, in terms of DMM concepts there are no specific conditions of temperature and strain rate for the optimum processing of the materials investigated. 相似文献
9.
David Harding David Bradford Gavin Brown 《Journal of The Association for Laboratory Automation》2002,7(2):84
Over the past few years, there has been much discussion about transferring industrial technology to laboratories. While it is easy to look at the superficial similarities, it is more important to examine the different requirements of different industries. In this way, it is possible to identify the technologies and techniques that can be successfully transferred to the laboratory to improve performance.This paper takes three very different industries - the bakery, High Throughput Screening (HTS) and mobile phone assembly and examines their different requirements. These industries have been selected from among the many sectors where the RTS Group operates - thus allowing real data from a number of situations to be used.One of the most important areas in automation design is the relationship between flexibility and throughput. This paper focuses on this relationship and its influence over machine configuration when comparing the requirements of the different industries. 相似文献
10.