Construction and field measurement of high-speed railway test embankment built on Indian expansive soil “Black Cotton Soil”

The railway embankment applied to high-speed railways is required to have high performance in terms of strength and deformation characteristics. Especially in the case of railway embankments that support slab tracks, the allowable settlement is very small. There are two technical challenges in constructing high-speed rail embankments to support slab tracks in India. The first challenge is dealing with problematic black cotton soil (BCS), which is widely distributed in India but very unusual soil in Japan. The second challenge is posed by the strict deformation requirement in the construction of the embankments. In this study, a 6 m-high test embankment was constructed on BCS in India. The deformation of the embankment and changes in water content were measured over a period of 18 months. In the construction of the test embankment, two different BCS countermeasures were applied. The results of the tests on this embankment were compared with those from an embankment without countermeasures. Complicated deformation behaviors, including settlement and the uplift of embankment, were observed in the section without countermeasure. However, in the embankment with cement-mixed gravelly soil (CGS) slab improvement with geosynthetics, the much lower amplitude of embankment deformation is evidence of the effectiveness of this countermeasure. The cohesive non-swelling soil (CNS) layer applied immediately below the embankment to reduce the water content fluctuation of BCS was not effective enough for use for high-speed railway embankment. Besides determining the technical challenges for the BCS countermeasures, the results of this study confirmed that a high-performance embankment can be constructed with Indian embankment material by performing sufficient compaction management.     

假目标密集度对SLC 性能的影响

根据旁瓣对消原理,分析了在密集假目标干扰方式下,假目标的密集程度和雷达的采样率对旁瓣对消性能的影响,并给出了仿真结果。为以后雷达更准确的保障试验和训练任务提供了依据。     

无线网络交换机射频传导抗扰度对策研究

无线网络交换机一般用于基站环境,外界干扰信号容易通过信号线或外壳耦合到无线网络交换机,影响其正常工作。文中基于以上情况,分析介绍GR-1089-CORE 射频传导抗扰度的测试原理和EUT 在试验中出现的问题,然后从接口滤波器的选取及安装电路设计两方面出发,进一步提出一系列的对策措施,增强无线网络交换机的射频传导抗干扰能力。     

全液压平地机平衡箱异响研究

全液压平地机平衡箱采用齿轮传动,易产生齿轮异响。介绍了异响故障的排除方法,从平衡箱产生异响的根源入手,结合齿轮传动特点,分析了设计、加工、装配、转运及存放环节中与异响密切相关的各种因素,针对各种因素提出了消除异响的措施。通过对以上措施的实施,全液压平地机平衡箱的异响得到了有效控制。     

浅议泉州市市政道路的建设与管理

改革开放,特别是20世纪90年代以来,随着城市经济的迅速发展和城市居民生活水平的大幅度提高,泉州市积极加大市政道路建设步伐,城市承载能力大大提高,服务功能不断完善,城市建设日新月异,市政道路建设也取得了极大发展。但是在发展中还是存在着很多问题和弊端,急需采取相应的对策给予解决和优化。     

新时期纺织企业出口战略的思考

基于对我国纺织品出口在世界市场上的地位和对2005年初我国纺织品出口剧烈变化的现状分析,讨论了ATC协议结束后我国纺织品出口屡遭限制的内在原因;提出了纺织品出口企业应准确认识"后配额"时代的含义,客观地审视和思考本企业的战略定位,以提高产品附加值和市场多元化为核心,通过提高企业综合竞争力赢得国际市场的战略思路建议.     

中国加入WTO对煤炭工业的影响与对策

从我国煤炭工业的现状和竞争力出发，分析了加入WTO后对促进我国煤炭工业的发展带来机遇的同时，也面临着严峻的挑战，提出了减少不良影响应采取的对策措施。     

美国军用集成电路供应链风险及其应对措施

本文对当前美国军用集成电路供应链面临的风险进行了详细分析，包括伪冒元器件、恶意芯片、集成电路工业基础，并从战略、管理、技术三个层面对美国政府采取的应对措施进行了深入研究，最后提出了启示。     

三氯氢硅生产的火灾危险性及对策

介绍了三氯氢硅的理化性质及生产原理，从电解、合成、贮罐等方面分析了三氯氢硅生产的火灾危险性，指出了防火防爆对策及泄漏处理和火灾扑救方法。     

某石化企业职工健康状况调查及职业卫生预防对策研究

通过对某石化企业生产装置职业危害因素和职工职业健康状况调查,分析和研究该企业所面临的职业病危害和影响职工队伍职业健康的主要因素。提出了加强职业卫生管理的对策和相应的防护措施。