工作电解液配方的计算机辅助设计软件

介绍一种工作电解液配方的计算机辅助设计系统 WEDS,包括其系统特点、功能模块组成及主要方法原理。并给出了一个该系统的使用实例。试验表明这是一个十分有效、实用的电解液配方辅助设计。     

基于Visual FoxPro的API抽油机的模块化设计

API系列抽油机是一种系列化、参数化、通用化的产品．有100多种型号。因此，采用模块化设计，使其由18类近100多种模块很快组合出其它型号约108种抽油机．大大地缩短设计和制造周期。其零部件具有高度的通用性、互换性．彻底地解决了各种抽油机之间换型问题．能及时满足市场的不同需求．使产品质量及数量大幅度提高．成本大幅度下降。     

Fabrication of ultrafine Nd-Fe-B powder by a modified reduction-diffusion process

In order to obtain ultrafine Nd-Fe-B powder, a spray-dried precursor was treated by reduction-diffusion (R/D) process.And, unlike the conventional R/D process, calcium reduction that is a crucial step for the formation of Nd2Fe14B was performed without conglomerating the precursor with Ca powder.By adopting this modified process, it is possible to synthesize the hard magnetic Nd2Fe14B at the reaction temperature as low as 850 ℃.The average size of Nd2Fe14B particles that are uniformly distributed in the optimally treated powder was ＜ ＜1 μm.Most Nd2Fe14B particles were enclosed with thin layers of Nd-rich phase.Typical magnetic properties of such powder without eliminating impurity CaO were iHc=～5.9 kOe, Br=～5.5 kG, and (BH)max=～6 MGOe.     

Age-hardening associated with precipitation reaction and spinodal decomposition in a commercial dental low-carat Au–Ag–Cu–Pd alloy

Two distinguishable hardening mechanisms, depending on the temperature, were found by isothermal ageing in a commercial dental low-carat Au–Ag–Cu–Pd alloy. Age-hardening was attributed to the precipitation of the metastable AuCu I and equilibrium AuCu I ordered phases and spinodal decomposition depending on the ageing temperature. It was clearly visible, by using the direct-ageing method, that the XRD peaks of the parent phases showed a shift during transformation.     

FPGA动态局部重构技术研究进展

基于现场可编程门阵列（FPGA）动态可重构系统可以实时重构硬件,提高计算的灵活性、自适应能力以及自优化能力。使用局部动态重构不仅能够保证重构过程中主系统的正常实时运行,而且可以减少重构过程的时间。然而,现有的基于FPGA的平台往往受到各种物理限制使得局部动态重构实施过程变得困难。文章介绍了目前FPGA动态局部重构技术面临的各种问题和解决方案,并对该技术的发展趋势给出了展望。     

64位Linux并行计算大气模型效率优化研究*

研究了CMAQ大气模型在64位Linux操作系统上不同CPU核心数目并行计算模拟耗时以及结果的差异情况。研究结果表明,并行计算能大幅缩短CMAQ模拟耗时,以16个CPU核心并行处理为性价比最佳值;此时连续模拟中国区域37天空气质量状况（分辨率36 km、167行×97列、垂直14层）平均耗时小于16 min/d,而相同情况下单核模拟耗时大于2 h/d;多于16个核心并行处理时,随核心数量的增加模型性能提升的趋势减缓;操作系统和参与运算的核心数目对CMAQ模型模拟结果没有影响。     

应力敏感气藏产能方程研究

针对应力敏感气藏开发存在变渗透率的问题,定义了新的考虑应力敏感的拟压力,并从气体多孔介质渗流力学理论出发,建立了考虑应力敏感影响的气藏二项式产能方程,讨论了该方程参数的计算方法,最后进行了实例分析,讨论了储层应力敏感性对应力敏感气藏产能评价的影响。研究表明：考虑气藏渗透率应力敏感性时预测的气井绝对无阻流量值比渗透率为常数时预测的结果低,预测偏差幅度与储层应力敏感性大小相关,该研究对深入了解应力敏感气藏的产能评价及其开发动态预测有一定的实际意义。     

Design of 1 kbit antifuse one time programmable memory IP using dual program voltage

A 1 kbit antifuse one time programmable (OTP) memory IP, which is one of the non-volatile memory IPs, was designed and used for power management integrated circuits (ICs). A conventional antifuse OTP cell using a single positive program voltage (V _PP) has a problem when applying a higher voltage than the breakdown voltage of the thin gate oxides and at the same time, securing the reliability of medium voltage (V _M) devices that are thick gate transistors. A new antifuse OTP cell using a dual program voltage was proposed to prevent the possibility for failures in a qualification test or the yield drop. For the newly proposed cell, a stable sensing is secured from the post-program resistances of several ten thousand ohms or below due to the voltage higher than the hard breakdown voltage applied to the terminals of the antifuse. The layout size of the designed 1 kbit antifuse OTP memory IP with Dongbu HiTek’s 0.18 μm Bipolar-CMOS-DMOS (BCD) process is 567.9 μm×205.135 μm and the post-program resistance of an antifuse is predicted to be several ten thousand ohms.     

MARC在接触分析中的应用

介绍了MARC软件的各部分组成及其非线性分析功能的特点，并以圆柱接触为例，将MARC有限元分析结果与赫兹理论进行了比较，两者吻合得比较好，这为MARC软件在求解诸如轴承分析、铁轨分析和橡胶密封等方面开辟了很好的应用前景。     

Signal processing for real-time identification of similar metals by laser-induced breakdown spectroscopy

Laser-induced breakdown spectroscopy(LIBS) is regarded as a promising technique for realtime sorting of scrap metals due to its capability of fast multi-elemental and in-air analysis. This work reports a method for signal processing which ensures high accuracy and high speed during similar metal sorting by LIBS. Similar metals such as aluminum alloys or stainless steel are characterized by nearly the same constituent elements with slight variations in elemental concentration depending on metal type. In the proposed method, the original data matrix is substantially reduced for fast processing by selecting new input variables(spectral lines) using the information for the constituent elements of similar metals. Specifically, principal component analysis(PCA) of full-spectra LIBS data was performed and then, based on the loading plots, the input variables of greater significance were selected in the order of higher weights for each constituent element. The results for the classification test with aluminum alloy, copper alloy,stainless steel and cast steel showed that the classification accuracy of the proposed method was nearly the same as that of full-spectra PCA, but the computation time was reduced by a factor of 20 or more. The results demonstrated that incorporating the information for constituent elements can significantly accelerate classification speed without loss of accuracy.