使用上引连铸无氧铜杆生产电气化铁道用硬铜承力索工艺研究

本工艺方案探索使用上引连铸无氧铜杆替代热轧黑铜杆来生产电气化铁道接触网用硬铜承力索生产工艺创新，采用连铸杆→Y型冷轧→拉伸工艺。通过控制冷加工量、温度、摩擦等要素，生产满足TB／T3111-2005《电气化铁道用铜及铜合金绞线》标准要求的硬铜承力索（绞线）。     

A new heuristic algorithm for rectangle packing

The rectangle packing problem often appears in encasement and cutting as well as very large-scale integration design. To solve this problem, many algorithms such as genetic algorithm, simulated annealing and other heuristic algorithms have been proposed. In this paper, a new heuristic algorithm is recommended based on two important concepts, namely, the corner-occupying action and caving degree. Twenty-one rectangle-packing instances are tested by the algorithm developed, 16 of which having achieved optimum solutions within reasonable runtime. Experimental results demonstrate that the algorithm developed is fairly efficient for solving the rectangle packing problem.     

Determination of the volume content of the components of an oil-water type emulsion from the parameters of an electromagnetic resonator

The variations of the main parameters of electromagnetic oscillations in the sensitive element (a resonator embedded in a pipeline) of a radio-frequency sensor under resonance conditions for flows of emulsion mixtures are determined and investigated. Algorithms for determining the volume content of the components of oil-water mixtures with an arbitrary degree of water mineralization are developed. __________ Translated from Izmeritel’naya Tekhnika, No. 9, pp. 60–65, September, 2007.     

WSN中一种基于数据融合的能量高效分簇路由协议

基于无线传感器网络中监测数据具有较高时空相关性的应用场景。提出了一种基于数据融合的局部能量高效汇聚分簇协议LEEAC，该协议通过反映局部空间相关性的数据相异度对节点剩余能量进行约束，并使用约束后的预测能量作为竞选簇头的主要依据，被选举的簇头在传感器网络中具有良好的分布性。同时通过引入数据鉴定码，减少了簇内数据传输阶段的通信量以及簇头数据融合的工作量，从而大大节约了能量消耗。实验结果表明，LEEAC协议能够有效均衡网络能量消耗。延长网络生存时间。     

单脉冲单通道跟踪体制精度分析方法

单脉冲单通道跟踪系统具有设备简单、实时性好、动态滞后小的特点,但由于跟踪通道噪声增加,致使跟踪精度较低。在实际应用中,单通道信号合成的方法不同,对跟踪精度的影响也不同。给出了场放前合成的实现方案,在分析其单通道信号形成、角误差解调原理的基础上,推导出该方案下的跟踪精度分析公式,说明了单通道跟踪系统的跟踪精度与单通道合成耦合度的关系。     

计算机应用于词频统计的算法研究

首次提出自适应词频统计算法,该算法突破传统的思维模式,排除了在词频统计中预先设定庞大词库、对不同文章建立统一标准的复杂性,而以目标文章为基础,根据每篇文章的主题,动态生成切合该目标文章的统计标准,从而提高词频统计的效率;其基本原理是以文章为独立单位,确定一个关系场,在场中,从主标题出发,以关系微量为基本元素,以文章整体即关系场为计算区间,进行迭代累加,以组成文中各种固定组合,并对其进行记录与分析,将重复一定次数的固定组合上升为词,该词的集合即为本算法所求;最终以软件实现该算法思想,并进行了百篇文章的统计试验;实验结果表明,该算法具有一定的准确性、稳定性,提高了效率。     

联苯二胺型均聚及共聚酰亚胺的聚集态结构

以PMDA、ODPA和BZD为单体合成了均聚和共聚PAA。采用一步法溶液热酰亚胺化工艺和两步法涂膜热酰亚胺化工艺,分别制备了均聚和一系列共聚PI粉末和薄膜。POM、X-ray研究表明,PM-DA/ODPA-BZD共聚PI粉末的结晶度随着ODPA含量增大,先下降后上升。两步法制备的PMDA-BZD均聚PI薄膜脆性较大,而共聚PI薄膜由于ODPA的引入,成膜性和柔韧性明显改善。X-ray结果表明,不同程序升温速率,可得到不同有序程度的PI薄膜,即延长各个程序升温阶段处理时间,利于分子链运动,制备的薄膜具有更高的有序程度。     

永磁铁氧体磁性能与料浆粒度关系的研究

注浆成型永磁铁氧体的磁性能与原始料浆颗粒的大小密切相关。通过工厂跟踪试验和实验室测试，深入分析了SrFe12O19。永磁铁氧体料浆颗粒大小对烧结后磁体的晶粒取向度、晶相结构和最终磁性能之间的关系。结果表明，料浆原始颗粒越小，则晶粒取向度越大，样品磁性能越好。     

Blasting cumulative damage effects of underground engineering rock mass based on sonic wave measurement

The principle of sonic wave measurement was introduced, and cumulative damage effects of underground engineering rock mass under blasting load were studied by in situ test, using RSM-SY5 intelligent sonic wave apparatus. The blasting test was carried out for ten times at some tunnels of Changba Lead-Zinc Mine. The damage depth of surrounding rock caused by old blasting excavation （0.8-1.2 m） was confirmed. The relation between the cumulative damage degree and blast times was obtained. The results show that the sonic velocity decreases gradually with increasing blast times, hut the damage degree （D） increases. The damage cumulative law is non-linear. The damage degree caused by blast decreases with increasing distance, and damage effects become indistinct. The blasting damage of rock mass is anisotropic. The damage degree of rock mass within charging range is maximal. And the more the charge is, the more severe the damage degree of rock mass is. The test results provide references for researches of mechanical parameters of rock mass and dynamic stability analysis of underground chambers.     

高产梳棉机的“梳棉理论”(Ⅰ)

文章从国内外梳棉机的发展历史;梳棉机给棉与刺辊的基本作用;刺辊的梳理;刺辊梳理度、梳理功、平均梳理比功;刺辊下气流运动规律等方面进行了详细阐述,从而加深了人们对梳理发展历程的认识,也有助于对给棉与刺辊部分作用的理解。