预制桩竖向极限承载力计算方法及可靠度计算

对静载荷试验方法、查经验参数表方法和静力触探方法三种方法的竖向极限承载力的计算原理及其可靠度计算进行了简要的介绍,对这些计算方法的可靠性和总安全系数的内在联系也进行了探讨,结果表明,采用试桩方法确定预制桩极限承载力的可靠度较大。     

瞬变电磁法在煤矿采区水文勘探中的应用

煤矿开采中最重要的地质任务是探测采区内小构造的分布及其含(导)水性，采区三维地震勘探主要用于探测地质构造，而电法勘探则用于含水构造的探测，本结合实例介绍了应用瞬变电磁法并结合三维地震进行煤矿采区水勘探的基本原理、野外施工技术及资料处理解释方法，实际应用表明，瞬变电磁法与地震勘探的综合水勘探降低了物探资料多解性问题，大大提高了勘探精度，可为煤矿防治水工作提供可靠的水地质资料。     

利用CF4等离子体制作高开口率TFT-LCD

为了获得高的开口率,有必要优化设计参数和工艺容差。通常的过孔刻蚀工艺采用SF6基气体进行刻蚀,但是这种方法在金属和钝化层之间的选择性太小,因此,必须增加过孔的尺寸才行。为了克服上述问题,在本研究中用CF4气体代替SF6气体进行刻蚀,结果在FFS 5 .16(2 .03 in)像素结构中,开口率提高了60 %。     

获得精细通孔图形的光刻技术改进

为了获得更高性能的TFT-LCD面板,在光刻时保证精细的图形成像十分重要,其中,如何制作出尺寸更小的通孔图形是主要的问题之一。本文提供的研究中,我们只简单地改变了一下烘烤工艺,而不需要改变Eop和显影时间,就可以将通孔图形的尺寸减小20 %~25 %。在后续的刻蚀工艺中,通孔的尺寸能显著减小。     

Fuzzy successive modelling and control for time-delay systems

In this paper, a procedure for constructing a fuzzy model of a given system associated with a digital fuzzy filter is proposed. Based on the structure of the Smith predictor, a hybrid model predictive control approach is also presented. Two experimental results using (1) an analogue simulator and (2) a blower temperature control rig have been illustrated. It shows that the proposed control structure is a feasible approach to control systems with time-delay.     

架空电缆在10 kV线路应用中的探讨

通过对10kV架空绝缘导线(以下简称架空电缆)性能分析，指出架空电缆在线路运行中的可靠性、经济性以及架设施工、维修便利等方面都优于裸导线。为了进一步科学应用架空电缆，针对一些容易发生的问题，提出了相应的防止措施，重点介绍了国内外架空电缆的防雷技术和咸宁地区的防雷特点。     

关于锅炉"四管"漏泄的综合治理

锅炉“四管”漏泄一直是造成工厂非计划停机的主要因素，据统计，自1999年至2001年三年间，因锅炉“四管”漏泄造成的非计划停运占总非计划停运的51．7％，通过对近三年来锅炉漏泄的原因分析和统计，提出了相应的对策和措施，以期通过治理，大幅度降低因锅炉“四管”漏泄造成的非计划停运次数，提高机组运行的可靠性。     

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.     

微测辐射热计的优化设计

针对典型的50 μm×50 μm双层微桥结构的微测辐射热计单元的设计,分析了其红外吸收性能、热性能、力学支撑性能及相互间的折衷关系,指出微桥桥面的夹层结构的各层膜厚选取和桥腿宽度的选取是兼顾红外吸收和热、力性能的关键因素.以Si3N4/VOx/ Si3N4膜系为例对微桥进行了优化设计,获得了理论上最佳的夹层结构膜厚和桥腿宽度,得到时间常数20 ms和8-14 μm波段有80 %以上红外吸收率.     

Dielectric and Electrostrictive Properties of Ferroelectric Relaxors in the System Pb(Mg1/3Nb2/3)O3:PbTiO3: Ba(Zn1/3Nb2/3)O3

Ceramic dielectrics which have been fabricated in the Pb(Mg_1/3 Nb_2/3)O₃:PbTiO₃:Ba(Zn_1/3Nb_2/3)O₃ composition system are shown to exhibit two distinct dielectric maxima, both of which show the characteristic loss spectra of ferroelectrics with diffuse phase transitions. The height of the individual maxima can be controlled by the Zn:Mg ratio in the starting material and, in suitably chosen compositions, a wide range of almost temperature-independent high dielectric permittivity is possible. These dielectrics show strong electrostrictive deformations under high electric fields but the electrostrictive strain is much less temperature-sensitive than in other relaxors.