Theoretical study on conformational features and cation-binding properties of a diquinone calix[4]arene

Scientific Research Fund of Hunan Provincial Education Department [12A132]; State Key Laboratory of Physical Chemistry of Solid Surfaces [201104]Theoretical studies of a diquinone calix[4]arene and its interactions with the cations Li+, Na+, K+ and Ag+ have been performed. Conformational features and cation-binding properties were evaluated with the restricted hybrid Becke three-parameter exchange functional method using the 6-31G(d) basis set and its relativistic effective core potentials. To model the effect of medium, the polarisable continuum model was also used. Four typical conformations of the parent diquinone calix[4]arene were studied. The calculated results show that the most stable conformers are 1,3-alternate and partial cone in the gas phase and in CH2Cl2 solution, respectively. The optimised geometric structures were used to perform natural bond orbital analysis. The two main types of driving force metal-ligand and cation- interactions are investigated. The calculated binding energy for cations (Li+, Na+, K+ and Ag+) is discussed. The calculated results indicate that cone complexes are the most stable

物理细胞自动机与岩石弹-脆-塑性性质的细观机制研究

基于能量守恒定律和岩石的基本力学性质,进一步发展了由作者提出的一种用于模拟岩石非线性破坏演化的新方法—物理细胞自动机(PCA)模型。该模型通过岩石内部(或细观)基元(或细胞)间简单的随机相互作用的综合结果来反映岩石系统整体的稳定宏观力学现象。利用PCA模型,研究了形成不同岩石本构关系的本质影响因素,揭示了岩石弹-脆-塑性性质的细观机制,为进一步认知岩石等非均质材料的力学性质提供了一种新的理论方法。同时,其研究思路和结论也可为微观和细观力学的数值模拟方法及新型复合材料的设计提供重要的借鉴

Airborne air-photo image-stabilizing cloud deck of unmanned aerial vehicle

本发明涉及无人机机载的拍摄装置，具体地说是一种无人机机载航拍稳像云台，横梁安装在无人机的固定杆上，在横梁上设有中间开孔的第一平板；水平旋转驱动舵机安装在第一框架上、通过水平传动机构与第一平板连接，第一平板的反作用力驱动第一框架水平旋转，水平角度检测电位器可相对转动地由第一平板的中间开孔穿过、固接在第一框架上；第二框架通过其两侧的水平轴可转动地安装在第一框架上，一侧的水平轴通过垂直传动机构与安装在第一框架上的垂直旋转驱动舵机相连，另一侧的水平轴连接有垂直角度检测电位器；第二框架通过垂直旋转驱动舵机的驱动垂直旋转，且随第一框架水平旋转。本发明减震效果好，传动力矩大，转动速度平稳

Insulator recognition based on moments invariant features and Cascade AdaBoost classifier

A method based on moments invariant features and cascade AdaBoost classifier for insulator recognition is put forward to solve the problem of poor performance of insulator recognition. At first, the insulator image is preprocessed by median filtering, dilating, eroding and Otsu thresholding. Then, for the better extraction of moments invariant features, the preprocessed insulator image is tilted correctly based on PCA (Principal Component Analysis). Next, the moments invariant features are extracted and chosen to compose complex classifier in the process of training AdaBoost. Finally, the complex AdaBoost classifiers are combined in a cascade method for insulator recognition. The results of experiments demonstrate that the proposed method can recognize the insulator from complex background in the mountainous area, and it has better robustness, accuracy and validity. © (2013) Trans Tech Publications, Switzerland

Method for high-voltage transmission tower positioning based on linear targets

本发明涉及一种基于线状目标的高压输电塔定位方法，包括以下步骤：利用Hessian矩阵得到每个像素点对应的Hessian矩阵特征向量的方向，该方向即为由该点组成的线状目标的方向；然后利用区域增长的方法提取Hessian矩阵特征向量方向近似的点组成小线段（线状目标）；最后利用统计方法，分别在水平和垂直方向上对小线段进行投票，小线段最集中的区域就是高压输电塔所在位置。本发明检测速度快、检测精度高，能够满足无人机巡检要求

Debugging table for small-sized engine

本发明一种小型发动机的测试平台，包括安装固定支架、近程监测控制模块、远程监测控制模块三部分。安装固定支架用于安装固定小型发动机；近程监测控制模块用于采集发动机在运行过程中的转速，缸体温度，油量大小参数，同时发送给远程监测控制模块，并执行远程监测控制模块发送过来的点火，熄火，调节油量大小控制指令；远程监测控制模块用于远距离对发动机进行控制，向近程监测控制模块发送控制指令，并接收近程监测控制模块返回的测量参数信息，显示的同时并将这些数据保存下来，以便于对小型航空器发动机的性能进行分析

Power transmission line patrol flying robot controller for preventing strong electromagnetic interference

本发明涉及防强电磁干扰的输电线路巡检飞行机器人控制器，第一处理芯片与第二处理芯片、陀螺仪、气压高度计、罗盘连接;电源电路与第一处理芯片、第二处理芯片、陀螺仪、气压高度计、罗盘连接；第一处理芯片用于采集陀螺仪、气压高度计和罗盘的数据，通过串口采集GPS数据，并将采集的数据进行处理得到飞行机器人的位置、姿态、速度信息；第二处理芯片根据第一处理芯片的位置、姿态、速度信息对与其连接的飞行机器人舵机进行控制；本发明在电路板上使用电源滤波器能够过滤飞行机器人工作中强电磁对供电系统的干扰；并且在电路板设计及安装设计上可防强电磁干扰

Automatic dispenser

本实用新型涉及投放器，具体地说是一种自动投放器，包括投放器主体及分别安装在其两侧的开关控制装置和支撑装置，开关控制装置包括舵机、十字杠及舵机开关，支撑装置包括支撑杆、支撑杆固定件及弹杆，舵机安装在投放器主体上，十字杠铰接在投放器主体上，十字杠的一端与舵机开关抵接；支撑杆的一端与安装在投放器主体上的支撑杆固定件铰接、并在铰接处设有扭转弹簧，支撑杆的另一端设有弹杆，十字杠的另一端与支撑杆的另一端之间为柔性连接；待投的投放物位于投放器主体内，由投放器主体及支撑杆支撑，投放物的引信通过弹杆顶紧。本实用新型实现投放自动化，结构简单，操作方便，机动性好，实用性强，安全可靠

Experimental studies on the three-dimensional effects of opposed-flow flame spread over thin solid materials

The three-dimensional effects of flame spread over thin solid materials were experimentally studied using a natural-convection-suppressing horizontal narrow-channel. In a sufficiently wide narrow-channel, the variation of flame spread against the width of the material sample showed different trends for different gas flow speeds and oxygen concentrations. The extent of three-dimensional effects was inversely proportional to the gas flow speed or its square. Near quenching extinction limits, the effects were significant because weak combustion is sensitive to a slight variation of heat loss and oxygen concentration. The effects may be due to different factors such as side heat loss, side oxygen diffusion, or both. Far away from quenching extinction limits, the effects were weak because vigorous combustion is insensitive to a small variation of oxygen concentration and heat loss. In all tests, the effects were limited to the samples of width less than 10 times of the diffusion length. Moreover, a higher oxygen concentration suppressed the effects at a lower gas flow speed. For sufficiently wide samples, in the most range of gas flow speeds, the channel width had almost no effect on flame spread. However, near extinction limits, the flame spread rate decreased with the increasing channel width. (C) 2010 The Combustion Institute. Published by Elsevier Inc. All rights reserved