回转类零件自由曲线CAD／CAM集成的实现

运用面向对象技术，研究了回转类零件中自由曲线ＣＡＤ／ＣＡＭ集成方法。     

低温冷藏玉米花粉过氧化物酶同工酶的变化

采用聚丙烯酰胺凝胶盘状电泳对低温冷冻－真空干燥－常低温保存的玉米花粉过氧化物酶同工酶进行了研究，在相对温度保持在８０％，贮藏温度－１０℃，花娄水汾保持在６％￣８％的条件下，经冷冻贮藏１５０ｄ后仍有５％￣８￣的萌发能力，结果表明，过氧化物酶同工酶酶谱的表达与冷藏的时间，温度，湿度有关。     

一些有机染料和中间体的SHG效应

采用固体粉末方法，测试了苯系偶氮、嘧啶、吡啶酮、四氢喹啉甲川型染料，以及中间体共６２个有机分子的ＳＨＧ效应，发现其中１４个品种具有ＳＨＧ活性。考察了影响ＳＨＧ效应的有关因素，发现电子效应基本一致的硝基和氰基取代染料，呈现出完全不同的ＳＨＧ性质。说明电子效应并不是影响有机分子ＳＨＧ活性的唯一因素，ＰＰＰ－ＭＯ理论计算结果也证实了这点。     

西北民族学院女教工妇科病调查分析

对西北民族学院汉、藏、回、蒙、维等八个民族的250名已婚女教工妇科病调查,有173人患各种不同的妇科疾患,患病率高达69.6%。各种妇科病随年龄增大而发病增多。经统计学检验,汉族与少数民族女教工之间妇科病患病率无显著差异。     

14C measurement of forest soils in Dinghushan Biosphere Reserve

Organic carbon in forest soils of Qingyunsi and Wukesong profiles can be divided into fast and slow components. Δ 14C values of these profiles decrease with increasing of depth. The Δ 14C values in 30-40 cm depth interval of Wukesong profile are decreasing sharply until a very low value, showing that a strong geological environment change occurred about 1 560 years ago. The 14C apparent ages of Wukesong profile show that the coniferous and broad-leaf mixed forests around Wukesong profile have been developing since 425 a BP, which is consistent with historical documents. The penetrating depths of "bomb 14C" in Qingyunsi and Wukesong profiles are 10 and 20 cm, respectively.     

企业并购目标选择的模糊决策

针对企业并购过程中的现实问题,分析了企业并购摧在动因,运用模糊数学工具,建立并购目标选择的模糊决策方法,并通过案例分析阐述该方法的具体应用,有助于提高最优并购目标选择的科学性。     

A Multi-Agent Approach for Solving Traveling Salesman Problem

The traveling salesman problem （TSP） is a classical optimization problem and it is one of a class of NP- Problem. This paper presents a new method named multiagent approach based genetic algorithm and ant colony system to solve the TSP. Three kinds of agents with different function were designed in the multi-agent architecture proposed by this paper. The first kind of agent is ant colony optimization agent and its function is generating the new solution continuously. The second kind of agent is selection agent, crossover agent and mutation agent, their function is optimizing the current solutions group. The third kind of agent is fast local searching agent and its function is optimizing the best solution from the beginning of the trial. At the end of this paper, the experimental results have shown that the proposed hybrid ap proach has good performance with respect to the quality of solution and the speed of computation.     

对大学生自我锻炼意识及若干影响因素的调查与对策研究

运用文献资料调查访问和数理统计等研究方法,对大学生自我锻炼意识及若干影响因素进行调查与分析,探讨如何培养大学生自我锻炼意识的方法和途径,旨在加强大学生自我锻炼意识教育,实现终身体育。     

A basal troodontid from the Early Cretaceous of China

Troodontid dinosaurs form one of the most avian-like dinosaur groups. Their phylogenetic position is hotly debated, and they have been allied with almost all principal coelurosaurian lineages. Here we report a basal troodontid dinosaur, Sinovenator changii gen. et sp. nov., from the lower Yixian Formation of China. This taxon has several features that are not found in more derived troodontids, but that occur in dromaeosaurids and avialans. The discovery of Sinovenator and the examination of character distributions along the maniraptoran lineage indicate that principal structural modifications toward avians were acquired in the early stages of maniraptoran evolution.