一种新型递减曲线的简单求法与应用

通过对油气藏产量递减的研究、线性最优化方法的分析研究及文献[1]提出的这种新型递减曲线的研究，提出了解这种方程的一个简单求法。通过现场的实例应用表明：提出的方法具有简单、方便、方法可靠的优点。采用此方法时，产量不以年为单位而是以月为单位进行计算，这将使计算更准确、更合理。     

Development of geometrically exact new shell elements based on general curvilinear co‐ordinates

In the present study first‐order shear deformable shell finite elements based on general curvilinear co‐ordinates are proposed. For the development of the present shell elements, a partial mixed variational functional with independently assumed strains is provided in order to avoid the severe locking troubles known as transverse shear and membrane lockings. Bubble functions are included in the shape function of displacement to improve the performance of the developed element. The proposed assumed strain four‐ and nine‐node elements based on the general tensor shell theory provide an efficient linkage framework for shell surface modelling and finite element analysis. In the several benchmark problems, the present shell elements with exact geometric representations demonstrate their performance compared to previously reported results. Copyright © 2002 John Wiley & Sons, Ltd.     

Long multifilament Bi-2223 Ag-sheathed superconducting tapes and solenoids

Multifilament Ag-sheathed BiPbSrCaCuO (2223) superconducting tapes containing 49 filaments were fabricated by the powder-in-tube route and the roll-anneal process. The transport critical current densityJ _c was 1.3×10⁴ A cm^–2 at 77 K and 7×10⁴ A cm^–2 at 4.2 K in self-field. A 12-m-long tape was used to construct superconducting solenoids (50, 28, and 14 mm internal diameters) generating dc fields 380–1070 G at 4.2 K. Measurements of the variation ofJ _c with field (0–1.6 T) and bend strain (0–5%) are used to explain the performance of the solenoids. The critical bend strain of tapes was about 1.5%.     

PP－g－AA的制备和表征

用熔融接枝方法制备了聚丙烯－ｇ－丙烯酸（ＰＰ－ｇ－ＡＡ）。用光电子能谱，广角Ｘ射线衍射，红外光谱和化学滴定方法对接枝物进行了定性和定量表征。讨论了单体和引发剂浓度对接枝率的影响，确定了用红外光谱法测定接枝物含量的经验公式     

固相缩聚共聚酯的熔融行为和结晶速率研究

通过固相缩聚合成了两种不同结构的高分子量共聚酯，研究了样品的熔融行为和结晶速率。研究发现，共聚酯的熔融峰随着固相聚合温度和时间的变化而与纯ＰＥＴ有明显的差别，共聚酯泊结晶速率与慢于纯ＰＥＴ的结晶速率。     

织物弹道贯穿性能分析计算

纤维织物增强复合材料由于轻质和高冲击损伤容限而在防弹装甲设计及制造中逐渐得到应用,如人体防弹衣和车辆防护装甲。但是尚无较好的方法直接计算复合材料防弹特性,其中困难在于复合材料弹道冲击过程中的应变率效应和冲击破坏机理至今没有被揭示。解决问题的第一步是建立复合材料增强相(即织物)防弹特性计算方法。提出基于纤维力学性质应变率效应的织物弹道冲击破坏分析模型,计算不同面密度织物靶体在弹道贯穿过程中的弹体剩余速度,由此反映靶体防弹特性。用本文中提出的简单算法预测的结果与实测结果在靶体厚度不大时极为接近,而且也有可能将其扩展到纤维织物增强复合材料防弹性质的计算。     

80kt/a硫磺回收装置国产化设计

介绍了无在线炉硫回收工艺的基本原理、技术特点和催化剂使用情况。已投用的工业装置运行结果证明 ,用该工艺设计的硫磺回收装置 ,硫回收率和尾气净化度高 ,投资少 ,能耗低 ,流程简单 ,操作控制方便 ,社会效益和经济效益显著 ,适用于同类装置的新建和改扩建项目 ,市场前景广阔。     

纺丝组件漏浆原因分析

通过对纺丝组件工艺对比调试,分析了纺丝组件消耗材料对纺丝组件漏浆的影响,指出了纺丝组件漏浆的主要影响因素。     

Revised Model of Strain in Ceria–Zirconia-Encapsulated Precious-Metal Particles

A previously proposed model of strain in ceria–zirconia-encapsulated precious-metal particles is revised to reflect several new observations: encapsulation of unstrained Pt particles, quantitative relation between partial reduction and the change in ceria–zirconia cell parameters, temperature/time dependence of strain relaxation/imposition in encapsulated Pd and Rh particles, and strained PdO. According to the revised model, the main cause of strain is partial oxidation of the precious metal (rather than the change in oxygen content of ceria–zirconia, as originally suggested).     

浅谈水利枢纽道路工程建设中的几个问题及其对策

从水利枢纽工程建设的实际出发,分析了枢纽道路建设中的几个值得考虑的基本问题。针对永久性道路的建设环境和建筑特点以及临时性道路的复杂性和多样性,提出了永久性道路和临时性道路建设的基本对策。基于高新技术材料HEC作为道路建筑胶凝材料的实际工程应用,在道路结构布局观念、设计思想、建筑选材和施工工艺及其技术经济性能比等方面提出了枢纽道路工程建设的实施方案,其有效性和可推广性在水布垭道路工程建设中得到了印证。