行波液体静压轴承浮力及其稳定方法的实验研究

提出了一种基于蠕动传输作用的新型行波液体静压轴承。首先基于行波液体静压轴承原理,建立了轴承原理验证装置。然后基于差动螺纹机构建立了轴承面倾斜调整机构,实现轴承的完全上浮。利用所开发的轴承验证装置,实验研究了行波液体静压轴承在上浮方向上有导轨时的轴承承载能力,证明了行波液体静压轴承及其稳定方法的可行性,并给出了驱动参数,例如:驱动电压和驱动频率,以及轴承间隙高度对轴承浮力稳态值的影响规律。     

火星探险新设想

火星探险新设想本林人类为寻求载人火星航行途径进行了不懈地探索。当然，至今仍没有找出登上火星的理想方法。我认为，根据现有的科学技术水平，人类登上火星途径要点在于利用火星上的材料建立火星探险营地。并以这个营地为依托，准备返航的推进剂，补给返航的食品，愉快...     

压电振动陀螺仪输出误差等效电路的探讨

本文探讨了压电振动陀螺仪中成为输出误差的力系数的多余部分，输入输出之间的静电耦合电容，以及机械耦合引影响等的等效电路，也就是在振动陀螺仪输入角加速度对应的解调输出出中力系数的多余部分，以及输入输出之间的静电耦合电容产生输出误差，而且使其特性平衡。另外，大的机械耦合不仅产生输出误差，而且也带来灵敏度下降。文章对这些不利因素做了定量分析，说明了减轻了办法，指明了振动陀螺仪的设计要领。     

亚声速圆柱绕流的摄动Galerkin杂交解

本文采用摄动伽辽金杂交方法，应用计算机代数与符号运算求解亚声速圆柱绕流。对给定的马赫数，获得了速度势的近似解表达式，并与Ｊａｎｚｅｎ－Ｒａｙｌｅ－ｉｇｈ方法进行了对比。计算结果表明本方法精度高，计算工作量小，解的表达式简洁。     

空气热力学参数对可压缩边界层线性流动稳定性的影响

本文详细讨论了空气热力学参数的不同近似方法对可压缩平板边界层线性稳定性的影响。数值结果表明Ｍ＝３以上的线性稳定性问题必须采用适当的热力学参数近似关系。     

中功率负载吸收体的研究

本文简要地介绍了小型中功率等效负载吸收体吸收材料的选择,负载吸收体的制备工艺及小型中功率等效负载的性能及其应用。     

Ground-Based Cloud Using Exponential Entropy/Exponential Gray Entropy and UPSO

Objective and accurate classification model or method of cloud image is a prerequisite for accurate weather monitoring and forecast. Thus safety of aircraft taking off and landing and air flight can be guaranteed. Thresholding is a kind of simple and effective method of cloud classification. It can realize automated ground-based cloud detection and cloudage observation. The existing segmentation methods based on fixed threshold and single threshold cannot achieve good segmentation effect. Thus it is difficult to obtain the accurate result of cloud detection and cloudage observation. In view of the above-mentioned problems, multi-thresholding methods of ground-based cloud based on exponential entropy/exponential gray entropy and uniform searching particle swarm optimization （UPSO） are proposed. Exponential entropy and exponential gray entropy make up for the defects of undefined value and zero value in Shannon entropy. In addition, exponential gray entropy reflects the relative uniformity of gray levels within the cloud cluster and background cluster. Cloud regions and background regions of different gray level ranges can be distinguished more precisely using the multi-thresholding strategy. In order to reduce computational complexity of original exhaustive algorithm for multi-threshold selection, the UPSO algorithm is adopted. It can find the optimal thresholds quickly and accurately. As a result, the real-time processing of segmentation of groundbased cloud image can be realized. The experimental results show that, in comparison with the existing groundbased cloud image segmentation methods and multi-thresholding method based on maximum Shannon entropy, the proposed methods can extract the boundary shape, textures and details feature of cloud more clearly. Therefore, the accuracies of cloudage detection and morphology classification for ground-based cloud are both improved.     

后掠平板横流不稳定性

本文研究了无限后掠平板三维边界层的横流不稳定性，证明行进波和定常波几平同时失稳，且行进波比定常波更不稳定；