关于摩擦力的分析和讨论

本文重点阐述了判定摩擦力方向的方法,对摩擦力的作用及摩擦力的成因进行了比较深入的探讨。     

川西北草地牛皮蝇蛆病的研究

对川西北草地牛皮蝇蛆病的流行情况、季节动态及防治技术的研究表明：（１）临床检查牦牛１１４９头、黄牛５９９头，皮蝇蛆寄生率分别为８４．２５％和７０．２８％，寄生强度为１８．３２个和２．１７个；剖杀检查牦牛１１４头，皮蝇蛆寄生率为１００％，寄生强度为７１．６６个．（２）川西北草地皮蝇的种类，经形态学和生化特性鉴定定为牛皮蝇Ｈ．ｂｏｖｉｓ、纹皮蝇Ｈ．ｌｉｎｅａｔｕｍ和中华皮蝇Ｈ．ｓｉｎｒｎｓｅ等三种．（３）弄清了皮蝇各期幼虫在牛体内的寄生季节、寄生部位、移行动态、三期幼虫寄生方位、入土化蛹羽化规律、成虫活动规律等．（４）害获灭（Ｉｖｏｍｅｃ）是防治牛皮蝇蛆病的首选药物，具有效果好、广谱、剂量小、安全、使用方便、易于推广等优点，防治后可获显著经济效益和明显社会效益     

断层波状构造及其控矿规律的定量研究

利用趋势分析与结构分析相结合的定量方法对断层的各级变异及波状构造进行分解和定量模拟,总结出断层波状构造的分级控矿和矿化局部化规律。据此,对研究区深边部盲矿体进行定位预测,指出了两个潜在工业矿化区。     

长江水质评价和预测的模型研究

本文研究长江水质的评价与预测的模型。对长江近两年水质总体情况和地区分布进行了定性和定量分析。根据近10年(水文年)的主要统计数据进行分析,给出了I—V类、劣V类水无量纲百分比发展趋势和污水排放量发展趋势的超越函数混合模型和趋势图,由此预测未来长江水污染的情势。最后对解决长江水质污染问题提出了几点建议。     

Relaxations in thermosets. XIII. Effects of post-cure and aging on the sub-Tg relaxations of nonstoichiometric epoxide-based thermosets

The dielectric permittivity and loss of diglycidyl ether of bisphenol-A (DGEBA) cured with greater than and less than the stoichiometric amounts of diaminodiphenyl methane (DDM) have been measured over a temperature range 77–350 K prior to curing and gelation, after curing at about 340 K and further aging for a predetermined period. The height of the γ-relaxation peak monotonically decreases during the post-cure period and becomes masked by the contributions from the β-relaxation peak, whose height, in turn, first increases on postcuring to a same maximum value for both nonstoichiometric thermosets and then decreases. This decrease is attributed to physical aging effects. The β-relaxation peak shifts towards higher temperature on postcuring. Comparison between the changes in the dielectric properties of the saturated and starved thermosets show that while the γ-relaxation process may be attributed to the motion of the epoxide dipolar groups of the unreacted DGEBA, the β-relaxation process is not attributable entirely to the motion of ? OH groups and of the unreacted amines in the thermoset. Explanations involving the chain and network packing in the structure of a thermoset are necessary for the observed behavior of the β-relaxation process in amine saturated and starved thermosets.     

Ⅱ－Ⅳ族化合物半导体超微粒子光谱性质的研究Ⅱ：硒化物、碲化物

本文报道了锌、镉、汞、铅硒化物、碲化物半导体超微粒子的制备以及它们的光谱性质，比较了它们的粗、细粒子的吸收光谱和荧光光谱的差异，以及与硫化物超微粒子的相似性，同时讨论了上述物质的超微粒子在老化过程中的行为及其原因．     

基于人工神经网络的高考扩招趋势预测研究

高考扩招系统足一个“黑箱”,各因素问是否存在因果关系还很模糊,基于人工神经网络自身的特点,采用BP模型,借助MATLAB语言对高考扩招系统进行预测研究．通过对历史数据的处理、程序的设计、网络的训练等进行分析,最终预测出中国未来20年高等教育发展的趋势,为国家相关政策的制定提供参考依据．     

Correlation between geometrical parameters of electrical tree and corresponding partial discharge parameters in XLPE

This paper deals with the experimental study on the correlation between the geometrical parameters of electrical tree and corresponding partial discharge (PD) characteristic parameters in the course of electrical tree aging within cross linked polyethylene (XLPE) insulation. The electrical tree aging tests were performed on specimens removed from a section of 220 kV transmission cable. The PD macroscopic characteristic parameters were found to be significantly dependent on the corresponding geometrical parameters of electrical tree channels in the course of aging of XLPE, and different kind of electrical tree has different characteristics, and there is obvious correlation between the type of electrical tree and the pre-applied power-frequency stress. Beside, using regression analysis, the expression of the relation between them were obtained, and from which it can be seen that there is significant nonlinear correlation between geometrical parameters of electrical tree and corresponding PD characteristic parameters in the course of aging of XLPE. Therefore, the aging degree of XLPE can be effectively evaluated by recognizing the changing regularity of the PD rnacroscopic characteristic parameters.     

De Broglie Tired Light Model and the Reality of the Quantum Waves

In the early 1960s of the 20th century de Broglie was able to explain the cosmological observable red shift, without ad hoc assumptions. Starting from basic quantum considerations he developed his tired light model for the photon. This model explains in a single and beautiful causal way the cosmological redshift without need of assuming the Big Bang and consequently a beginning for the universe. Evidence coming from Earth sciences seems also to confirm these ideas and furthermore concrete proposal of laboratorial scale experiments that can test the model are reviewed.     

生态系统服务研究进展

生态系统服务术语逐渐为人们所公认和普遍使用。生态系统服务的价值评价是此领域研究的热点和难点。应构建生态系统与经济系统相结合的地区模型和全球模型,为生态系统服务的划价提供理论和实践支持。