Study of the helicopter blade running elevation measurement system

Helicopter blade running elevation measurement is an important measure target in helicopter blade dynamic balance experimentation. The elevation influences the helicopter＇ s security and other performance capabilities. In testing, however, it has been difficult to measure the elevation when the rotor reaches high speeds. To get a simple, fast and highly accurate measurement system, photo electricity technology was applied to measuring the blade running elevation. Discussed is the measurement principle of blade running elevation, tire design of the measurement system and analysis of the measurement precision.     

Sensitivity analysis and dynamic modification of modal parameter in mechanical transmission system

Sensitivity analysis is one of the effective methods in the dynamic modification. The sensitivity of the modal parameters such as the natural frequencies and mode shapes in undamped free vibration of mechanical transmission system is analyzed in this paper. In particular,the sensitivities of the modal parameters to physical parameters of shaft system such as the inertia and stiffness are given. A calculation formula for dynamic modification is presented based on the analysis of modal parameter. With a mechanical transmission system as an example, the sensitivities of natural frequencies and modes shape are calculated and analyzed. Furthermore, the dynamic modification is also carried out and a good result is obtained.     

Market based framework for multiple AUVs cooperation

A“Market” based framework for multiple AUVs team is introduced in this paper. It is a distributed meta-level task allocation framwork. The formulation and the basic concepts of the “Market” such as “goods” and “price” are discussed first, then the basic algorithm of the “auction”. The loosely coupled v-MDTSP tasks are considered as an example of the task allocation mission. A multiple AUV team controller and a detailed algorithm are developed for such applications. The simulation results show that the controller has the advantages such as robustness and low complexity and it can achieve better optimization results than the classical central controller （ such as GA） in some tasks. And the comparison of two different local solvers also implies that we should get the reasonable task allocation even not using the high quality algorithm, which can considerably decrease the cooperation computation.     

浅埋暗挖大跨地铁车站施工技术

介绍北京地铁五号线崇文门车站为保证工程施工安全,保护周边环境及临近建筑物,采用“中洞法”和“柱洞法”及综合应用了多种施工技术进行修建,解决了很多技术难题,推动了“浅埋暗挖法”在城市地下工程应用与发展。     

基于Web Service的铁通信息门户设计与实现

Web Service是下一代Web的标志性技术,在企业事务处理等方面有着巨大的应用前景.介绍了Web Service及其体系结构,提出利用Web Service技术设计实现铁通信息门户的解决方案.     

加强机械管理，提高公路建设水平

结合实际情况,介绍了公路建设部门如何加强施工机械管理,提高企业效益,并提出了较为合理的管理模式及办法。     

独立轮对在轻轨车辆上的应用

同传统的轮对相比,独立轮对由于具有横向稳定性好、磨耗小、噪声低、重量轻且易于实现整车低地板结构的特点,近年来已在轨道车辆上得到大量应用。简要地介绍了独立轮对特点及轻轨车辆发展概况,着重讨论了独立轮对在轻轨车辆上的应用情况及发展前景。     

中远集团船员英语适岗考试轮机英语笔试命题原则与规律

轮机英语适岗考试对各轮机员英语适岗考试具有不同的适岗要求和标准,即岗位不同,对各轮机员所应掌握的专业知识和业务知识的要求不同,英语的评价标准也不同。因此命题时,要根据适岗要求,轮机英语专业知识,业务知识的合理分布以及语言的难易程度分别拟订各个级别的试题,遵循这一命题原则和规律,拟订符合各轮机员适岗要求的笔试命题。     

黄陵县克山病病情现状

目的　观察克山病病情消长趋势 ,为防治和病情相关因素探索提供依据。方法　按“克山病监测”标准 (1 997年 )实施。结果　监测期内全县未见新发急 (亚急 )型克山病 ;监测点潜在型年新发生率 2 6 9/万 ;全县农业人群中慢型患病率 1 6 7/万 ,年新发现率 0 83/万 ,死亡率0 6 0 /万 ;在店头和腰坪两个重病乡镇 ,慢型年新发现率为 1 5 /万～ 1 8/万。结论　以急 (亚急 )型有无新发病及潜在型和慢型年新发生 (现患 )率为评估标准时 ,近 5年来黄陵县克山病病情稳定在 80年代中后期水平 ;慢型克山病是当前的防治重点。     

乳腺恶性肿瘤组织中Cyclin D_1的表达与临床病理相关性

目的　探讨细胞周期素D1 (CyclinD1 )在乳腺肿瘤组织中的表达及临床病理相关性。方法　采用免疫组化SP法检测 78例乳腺恶性肿瘤及 1 7例乳腺良性病变石蜡包埋标本CyclinD1 表达。结果　CyclinD1 在乳腺恶性肿瘤细胞核中呈棕黄色染色 ,于核边缘近核膜处浓集 ,阳性表达率 44.87% ,其中在导管内原位癌 (DCIS) 5 /7例及叶状囊肉瘤 1 /1例中阳性表达。CyclinD1 表达与患者雌激素受体 (ER)显著相关 (P <0 .0 5 ) ,而与年龄、病理类型、组织学分级、淋巴结状态、肿瘤大小等无关 (P >0 .0 5 )。生存分析资料显示CyclinD1 (+)、(- )两组 5年相对复发危险度 (RRR)u =1 .95 9(P >0 .0 5 ) ,Kaplan Meier生存曲线示两组 5年累积无复发生存期 (RFS)无显著差异 (P >0 .0 5 )。结论　①CyclinD1 在乳腺癌发展初期即异常表达 ,有助于从分子水平鉴别原位癌与非典型增生 ,但其表达与肿瘤分化及恶性进展无关。②CyclinD1 表达与ER相关 ,可能有助于判断内分泌治疗敏感性。③CyclinD1 的表达与预后无关。