隐身技术在进气道设计中的研究

根据隐身飞机的设计特点 ,对各种改善进气道隐身性能的技术措施进行了概述。通过对理论计算和试验研究结果的分析 ,给出了能有效降低进气道RCS的有实际意义的方案     

基于干扰观测器的新一代歼击机鲁棒飞行逆控制器设计

基于干扰观测器设计了新一代歼击机的鲁棒飞行逆控制器。根据时标分离的原则，将机动飞机分为快慢不同的回路。采用动态逆方法设计了快回路和慢回路控制器，并在慢回路用干扰观测器估计飞机所受的扰动，同时，用于在线补偿动态逆误差。仿真结果表明，该设计合理。     

高校图书馆信息素质教育的内容与实施策略

信息素质是21世纪人们适应信息化社会生活的必备素质,高校图书馆有义务也有能力实施好信息素质教育。根据信息素质教育的内容与策略,提出了加强高校图书馆信息素质教育的几项措施。     

基于模块的标准ATLAS语言及其应用

面向模块的ATS设计是现代测试技术的重要分支.论述了测试语言ATLAS的产生、发展过程,分析了其存在的问题.指出基于模块的ATLAS是标准的测试语言,详细介绍了它的特点、模型结构及在现代ATS设计中的应用,满足了TPS可移植性的发展要求,代表着现代测试语言的发展方向.     

Effect of sodium tartrate concentrations on morphology and characteristics of anodic oxide film on titanium alloy Ti–10V–2Fe–3Al

The effect of sodium tartrate concentrations on morphology and characteristics of ano-dic oxide film on titanium alloy was investigated. The alloy substrates were anodized in different concentration solutions of sodium tartrate with the addition of PTFE emulsion and their morphol-ogy and characteristics were analyzed. The anodic oxide film presented a uniform petaloid drums and micro-cracks morphology. Additionally, micro-cracks dramatically swelled with the increase of the tartrate concentrations. The thickness of the anodic oxide film increased with the concentra-tions until the concentration reached 15 g/L. The results of Raman analysis illustrate that all sam-ples have similarity in the crystal structure, consisting of mainly amorphous TiO2, some anatase TiO2 and a small amount of rutile TiO2. And the ratios of anatase TiO2 and rutile TiO2 increase with the concentrations until it reaches 15 g/L. Furthermore, the intensity of the peaks increases with enhanced concentrations until the concentration reaches 15 g/L. The corrosion resistance of the anodic oxide film is increased by the sodium tartrate with higher concentrations before 15 g/L. The coefficient of friction of the anodic oxide film reduces with the concentrations until the concentration reaches 15 g/L, then the coefficient of friction of the anodic oxide film increases with the concentrations.     

铁基金刚石节块的热处理及其耐磨性能研究

首次提出了在烧结型金刚石工具的制造中引入热处理的新工艺，并系统地研究了淬火温度、淬火时间及回火温度等热处理工艺参数对热压烧结型铁基金刚石圆盘锯节块及其胎体材料机械性能的影响，同时对经热处理的铁基金刚石圆盘锯节块在石材旺苍红上进行磨损试验研究。试验结果表明，热压烧结型铁基金刚石圆盘锯节块胎体热处理的最佳工艺参数为：淬火温度为７６０～７９０℃、淬火时间为３．５ｍｉｎ、回火温度为２４５～３１５℃；经热处理后铁基金刚石圆盘锯胎体及节块的强度、硬度等机械性能有显著的提高，热处理也能明显改善铁基金刚石圆盘锯节块的耐磨性能。这说明将热处理工艺用于烧结型金刚石工具的制造中是切实可行的。     

航空发动机进气支板电热防冰试验

为了研究电加热防冰的效果,开展了小型航空发动机进气支板的电加热防冰试验。结合该型号发动机进气支板的结构特点,设计了3种电热防冰加热布置方式,分别在支板沿轴向的不同位置采用1~3个电加热棒作为防冰热源。通过模拟不同的发动机进气结冰环境参数和电加热功率,在冰风洞中对3种电加热方式进行了防冰试验研究。通过布置在支板外表面的温度测点记录了防冰过程中支板表面的瞬态温度变化,分析了支板防冰过程中表面温度的变化特点。防冰试验研究了热源总功率、热源布置方式、液态水含量以及来流温度对支板防冰性能的影响。试验结果表明,合理的电加热方式可以取得较好的防冰效果,同时避免支板后部的溢流水结冰。     

Neoplastic cell transformation by high-LET radiation: molecular mechanisms.

Experimental data on molecular mechanisms are essential for understanding the bioeffects of radiation and for developing biophysical models, which can help in determining the shape of dose-response curves at very low doses, e.g., doses less than 1 cGy. Although it has been shown that ionizing radiation can cause neoplastic cell transformation directly, that high-LET heavy ions in general can be more effective than photons in transforming cells, and that the radiogenic cell transformation is a multi-step process [correction of processes], we know very little about the molecular nature of lesions important for cell transformation, the relationship between lethal and transformational damages, and the evolution of initial damages into final chromosomal aberrations which alter the growth control of cells. Using cultured mouse embryo cells (C3H10T1/2) as a model system, we have collected quantitative data on dose-response curves for heavy ions with various charges and energies. An analysis of these quantitative data suggested that two DNA breaks formed within 80 angstroms may cause cell transformation and that two DNA breaks formed within 20 angstroms may be lethal. Through studies with restriction enzymes which produce DNA damages at specific sites, we have found that DNA double strand breaks, including both blunt- and cohesive-ended breaks, can cause cell transformation in vitro. These results indicate that DNA double strand breaks can be important primary lesions for radiogenic cell transformation and that blunt-ended double strand breaks can form lethal as well as transformational damages due to misrepair or incomplete repair in the cell. The RBE-LET relationship is similar for HGPRT gene mutation, chromosomal deletion, and cell transformation, suggesting common lesions may be involved in these radiation effects. The high RBE of high-LET radiation for cell killing and neoplastic cell transformation is most likely related to its effectiveness in producing DNA double strand breaks in mammalian cells. At present the role of oncogenes in radiation cell transformation is unclear.     

Determination of optimal samples for robot calibration based on error similarity

Industrial robots are used for automatic drilling and riveting.The absolute position accuracy of an industrial robot is one of the key performance indexes in aircraft assembly,and can be improved through error compensation to meet aircraft assembly requirements.The achievable accuracy and the difficulty of accuracy compensation implementation are closely related to the choice of sampling points.Therefore,based on the error similarity error compensation method,a method for choosing sampling points on a uniform grid is proposed.A simulation is conducted to analyze the influence of the sample point locations on error compensation.In addition,the grid steps of the sampling points are optimized using a statistical analysis method.The method is used to generate grids and optimize the grid steps of a Kuka KR-210 robot.The experimental results show that the method for planning sampling data can be used to effectively optimize the sampling grid.After error compensation,the position accuracy of the robot meets the position accuracy requirements.     

Integrated Safety Culture Model and Application

A new safety culture model is constructed and is applied to analyze the correlations between safety culture and SMS. On the basis of previous typical definitions, models and theories of safety culture, an in-depth analysis on safety culture＇s structure, composing elements and their correlations was conducted. A new definition of safety culture was proposed from the perspective of sub-culture. 7 types of safety sub-culture, which are safety priority culture, standardizing culture, flexible culture, learning culture, teamwork culture, reporting culture and justice culture were defined later. Then integrated safety culture model （ISCM） was put forward based on the definition. The model divided safety culture into intrinsic latency level and extrinsic indication level and explained the potential relationship between safety sub-culture and all safety culture dimensions. Finally in the analyzing of safety culture and SMS, it concluded that positive safety culture is the basis of im plementing SMS effectively and an advanced SMS will improve safety culture from all around.