边坡锚固工程分析中的水平条分法

对目前中国规范推荐用于边坡加固计算的垂直条分传递系数法进行研究,发现将该方法用于边坡锚固受力分析时,不仅存在垂直条块与加固结构体（锚杆和锚索）相互交叉,而且计算得出的锚固力与加固体的实际锚固力存在偏差等缺陷。在相关资料提出的、用于加筋土稳定性分析的水平条分法基础上,结合边坡锚固工程的特点,将该水平条分法做进一步拓展,使其能适用于锚杆和锚索等边坡锚固工程的稳定性计算,并通过工程实例对拓展后的水平条分法进行了验证。     

全民阅读与读者服务的研究

借鉴国内外图书馆阅读推广与全民阅读的理论与实践经验,系统研究国家图书馆学的理论体系,运用案例调查、图书馆学的原理和方法,立足于江西省区域图书馆服务于居民阅读的实际现状,结合国家和东部地区的有益经验政策,构建一种新型的图书馆创新服务体系以及图书馆信息化建设与评估的机制。     

CJ18．2tex赛络纱的生产实践

阐述了赛络纺纱技术的原理,探讨了F1510细纱机改造赛络纺的方法,优选了工艺参数．试验结果表明,在相同的配棉条件下,CJ18．2tex赛络纱的条干、粗细节、强力和毛羽均优于相同线密度的传统环锭纱．     

Key techniques for predicting the uncertain trajectories of moving objects with dynamic environment awareness

Railway Engineering Science - Emerging technologies of wireless and mobile communication enable people to accumulate a large volume of time-stamped locations, which appear in the form of a...     

Thermoelectric properties of Ca3Co4O9 ceramics

Ca₃Co₄O₉ ceramics were prepared using the sol-gel process with ordinary pressing sintering and their thermoelectric properties were measured from room temperature to 673 K. The experimental results show that single phase Ca₃Co₄O₉ can be fabricated at 750–900 °C in different citrate acid molar proportions for 0.2–1.0. For all the oxides, both the Seebeck coefficients S and the electrical conductivities κ increase with the increasing temperature. The Seebeck coefficients S are all positive. The thermal conductivities k increase with the increasing temperature also and the lattice thermal conductivity κ _l plays an important role to the thermal conductivity κ. The citrate acid molar proportions have a large influence on the particle sizes, which influences the thermoelectric properties of the ceramics. The figure of merit increases with the increasing temperature and reaches 4.5×10⁻⁵ K⁻¹ at 573 K for the sample in the citrate acid molar proportion of 0.46.     

改进教与学优化算法的LQR控制器优化设计

为了快速有效地确定线性二次最优控制(linear quadratic regulator,LQR)问题中的加权矩阵Q和R,针对主动悬架LQR控制器权系数设计问题,提出一种改进的教与学优化算法进行LQR优化设计。算法对基本教与学优化算法中的"教"与"学"阶段进行了进一步的改进,同时提出一种"自我学习"策略。通过仿真实验表明,和基本教与学算法、粒子群算法、遗传算法相比,本文算法在对主动悬架LQR控制器优化时,具有收敛速度快,求解精度高和稳定性强等优势。     

Effect of deposition time on microstructures and growth behavior of ZrC coatings prepared by low pressure chemical vapor deposition with the Br<Subscript>2</Subscript>-Zr-C<Subscript>3</Subscript>H<Subscript>6</Subscript>-H<Subscript>2</Subscript>-Ar System

ZrC coatings were deposited on graphite substrates by low pressure chemical vapor deposition (LPCVD) with the Br₂-Zr-C₃H₆-H₂-Ar system. The effects of deposition time on the microstructures and growth behavior of ZrC coatings were investigated. ZrC coating grew in an island-layer mode. The formation of coating was dominated by the nucleation of ZrC in the initial 20 minutes, and the rapid nucleation generated a fine-grained structure of ZrC coating. When the deposition time was over 30 min, the growth of coating was dominated by that of crystals, giving a column-arranged structure. Energy dispersive X-ray spectroscopy showed that the molar ratio of carbon to zirconium was near 1:1 in ZrC coating, and X-ray photoelectron spectroscopy showed that ZrC was the main phase in coatings, accompanied by about 2.5mol% ZrO₂ minor phase.     

多视无人机影像环形拼接算法

由于多视无人机影像拼接时误差的传播和累计经常导致拼接图扭曲偏斜或者拼接的失败.针对这个问题提出了构建拼接环并以多级拼接作为辅助的拼接策略.首先将待拼接图像分为多组,每组中以环形方式进行拼接,然后利用SIFT进行匹配,RANSAC实现误匹配的去除,而后计算透视变换关系,最后通过平差方程将误差削弱.通过实拍无人机影像进行的拼接实验表明该方式可以有效减少累计误差的影响,提高拼接精度.该方法的提出可以作为影像拼接消除累计误差的有效方式之一.     

井下滑套阀门开度检测系统设计与实现

针对井下滑套阀门开度检测系统在高温环境的工作情况,分析了高温环境对系统正常工作的影响。研制了一种适应井下高温环境要求、非接触、与滑套阀的滑套外径配套、能连续测量滑套全行程的位移传感器及满足井下高温环境要求的全数字解调装置。通过对系统进行高温测试,得出不同温度下阀门开度与输出电压信号的一种近似线性关系,并将这种规律性的关系放入软件部分进行温度补偿。由此形成井下滑套阀门开度检测系统,实现滑套阀门开度的全行程连续测量,从而为全电动智能井系统的研制解决一个关键的技术问题。     

中国南北过渡带干旱时空变化

为识别中国南北过渡带的干旱状况,利用研究区内1960-2015年32个气象站逐月降水量和月平均气温等资料,计算每个站点的逐月综合气象干旱指数CI,并利用累积距平法等分析中国南北过渡带干旱变化情况。结果表明:就时间变化而言,干旱强度、干旱历时以及不同等级的干旱发生频率随时间均呈上升趋势,并且,轻旱在所有等级干旱中占比最重,为55.6%;就季节变化而言,干旱的发生具有季节性规律,春旱的强度最大,且历时较长,夏旱最易发生,秋旱的发生频率总体呈现出先增大后减小的趋势,在20世纪90年代达到最大值,冬旱的历时值最短;就空间变化而言,研究区内北部相对干旱,南部相对湿润,武都地区和研究区内的河南地区最为干旱,甘肃南部反而是整个研究区最湿润的地区。