摘要：The martensitic transformation,mechanical,and magnetic properties of the Ni_(2)Mn_(1.5-x)Cu_(x)Ti_(0.5) (x=0.125,0.25,0.375,0.5) and Ni_(2-y)Co_(y)Mn_(1.5-x)Cu_(x)Ti_(0.5)[(x=0.125,y=0.125,0.25,0.375,0.5) and (x=0.125,0.25,0.375,y=0.625)]alloys were systematically studied by the first-principles *** the formation energy,the martensite is smaller than the austenite,the Ni–(Co)–Mn–Cu–Ti alloys studied in this work can undergo martensitic *** austenite and non-modulated (NM) martensite always present antiferromagnetic state in the Ni_(2)Mn_(1.5-x)Cu_(x)Ti_(0.5) and Ni_(2-y)Co_(y)Mn_(1.5-x)Cu_(x)Ti_(0.5) (y<0.625) *** y=0.625 in the Ni_(2-y)Co_(y)Mn_(1.5-x)Cu_(x)Ti_(0.5) series,the austenite presents ferromagnetic state while the NM martensite shows antiferromagnetic *** doping can decrease the thermal hysteresis and anisotropy of the Ni–(Co)–Mn–Ti *** Mn and decreasing Ti content can improve the shear resistance and normal stress resistance,but reduce the toughness in the Ni–Mn–Cu–Ti *** the ductility of the Co–Cu co-doping alloy is inferior to that of the Ni–Mn–Cu–Ti and Ni–Co–Mn–Ti *** electronic density of states was studied to reveal the essence of the mechanical and magnetic properties.

摘要：On the basis of the current sheet model, a new analytical solution for permanent magnet （PM） bearings is developed. Compared with analytical methods based on the coupling energy model and the magnetic dipole model, the proposed one is more physically intuitive and convenient for engineering designers. According to the analytical model, the thrust characteristics of a novel PM thrust bearing is studied and verified by finite element analysis （FEA）. In the proposed thrust bearing configuration, the rotor is composed of stacked PM tings with alternative axial magnetization directions, and the stator with alternative radial magnetization directions while copper rings are used to separate adjacent PM rings. A prototype PM thrust bearing with the proposed configuration is designed and fabricated. The performances of the PM thrust beating are experimentally validated. It is shown that the calculation accuracy of the presented analytical solution is satisfying.

摘要：对刘国东等提出的BP(误差反向传播)神经网络归一化模型进行了改进,得到了适合钢轨交流闪光焊落锤质量预测的BP神经网络归一化模型。基于LabV iew开发软件编制了高速采集软件。采集了U71Mn钢轨焊接工艺正交试验的焊接电流、焊接电压和动立柱的位移,并从中提取加速烧化前一阶段的闪光率、能量输入、焊接时间和烧化量等质量特征量作为BP神经网络预测模型的输入量。建立了输入层单元数为5、隐含层单元数为14的BP神经网络焊接接头落锤质量的预测模型;以正交设计工艺试验的27个焊接接头中的17个作为训练样本,对预测模型进行训练。以余下的10个作为检验样本,采用将训练后的预测模型进行预测,预测准确率达到90%。

摘要：我国绿色建筑是在倡导可持续发展、低碳环保、循环经济的大背景下提出的科技环保营造概念。发展绿色建筑产业将为城乡建设及科技建筑产业的智能化发展基础。本文总结现阶段绿色建筑发展成果,明确发展方向,解读绿色建筑相关法规政策及内涵,阐述我国大力发展绿色建筑的意义,面对的挑战,现阶段产生的环境效益并提出政策建议。

摘要：数学实验是随着人类思维,数学理论和计算机等现代科学技术发展而形成的一种科学研究方法,开展数学实验也是信息技术与数学课程整合的重要手段.在我国西部贵州遵义、贵阳开展的Logo中学数学实验,历经近二十年的实践与理论研究,日趋成熟,为中学开展数学实验提供了又一种技术平台.该项实验的基本理念以及通过Logo程序设计方式做数学实验的课程目标、内容和组织实施,乃至与中学数学现行教材配套的实验教材及软件的出版,成为西部地区数学课程改革园地的一朵奇葩.

摘要：针对传统的去雾方法对无人机有雾图像进行去雾时存在细节丢失严重、去雾效果差等问题,本文提出了一种结合双边滤波视网膜反应(Retinex)算法和图像融合的图像去雾方法。首先,利用双边滤波Retinex精确计算入射分量,对亮度分量进行双边滤波Retinex处理。其次,对两个色彩空间处理后的影像进行图像融合。最后,本文以两景无人机有雾图像为实验数据进行实验,结果表明,本文方法的标准差和信息熵等指数整体上升,能获得细节与色彩较好的去雾影像。

摘要：城市的可识别性场所的营造,应该在其场地、设计内容、周围环境以及人的活动机制等基础上衍生出来。场所能否吸引人在此聚集,是场所营造的明确目标之一。对于这种具有真实意义的问题,需要用理性和科学性的观点及方法来探讨其中最基本同时也是最重要的内容。

摘要：为研究抗爆窗在爆炸载荷作用下的力学响应及反弹力,设计了一种测量抗爆传递窗在爆炸载荷作用下的反弹力的试验,将难以测量的反弹力转换为测量螺栓拉力,并通过试验及数值模拟证明了方法的可行性,在此基础上研究了等效静荷载与抗爆窗最大位移、板面应变以及反弹力的关系,结果表明存在明显的线性关系。

摘要：高师院校数学教育如何适应我国基础教育数学课程改革的需要，是一个亟待解决的问题。《高中数学选修课程专题研究》的指导思想是建立一支高素质的教师队伍是扎实推进素质教育的关键，课程目标有：研究高中数学课程标准开设选修课的理念和原则，提高高师生学习数学的兴趣和应用数学的能力，培养高师生必要的教学技能。《高中数学选修课程专题研究》包括数学史选讲、信息安全与密码、球面上的几何、对称与群、欧拉公式与闭曲面分类、三等分角与数域扩充、算法初步、矩阵与变换、优选法与试验设计初步、统筹法与图论初步、风险与决策、开关电路与布尔代数等12个专题。

摘要：A new method to obtain supercontinuum(SC) source for multiplex coherent anti-stokes Raman scattering (CARS) microscopy is proposed. The nonlinear propagation in photonic-crystal fibers (PCF) of femtosecond pulse laser with central wavelength at 800.9 nm is studied with scalar wave theory. Based on the incident laser power and dispersion of PCF, super broadband source for multiplex CARS microscopy is designed.