并列短语及其词序的认知语言学研究

有关并列短语及其词序的研究目前主要存在四方面的问题：“并列短语”的概念之争、并列短语的界定、并列短语与并列复合词的异同、并列短语的词序。为解决这些问题与分歧,认知语言学的基本观点、假设、范畴的原型观、语言的象似观、概念整合理论以及词汇化和短语固化等理论和观点构成研究并列短语及其词序的理论基础,该理论能在一定程度上对以上问题作出合理的解释。根据范畴的原型观,并列短语具有典型性,为并列短语及其词序研究尤其是定量研究提供了理论基础;象似性在并列短语中大量存在,尤其是顺序象似或时间顺序原则,在汉语中尤为明显;词语整合具有层级性,并列短语在词汇化和固化程度上的不同,与概念的整合层级性相关。     

基于STATCOM的自励异步发电机不对称负载控制

针对独立自励异步发电机(SEIG)加载后电压和频率聚降的问题,提出了一种带储能装置的静止同步补偿器(STATCOM)对其进行并联补偿,以维持负载后机端电压和频率的稳定.基于自然坐标系的控制策略,实现STATCOM有功和无功的解耦控制,达到稳压稳频的目的.为了减小不对称负载电流对发电系统造成的危害,在三相参考电流中注入定子电流负序分量加以抑制.该控制策略在d SPACE+Quanser8实验平台上进行验证,结果表明,所采用的控制策略能有效提高异步发电机的负载能力和电能质量.     

宽角扫描相控阵天线测量方法

提出了一种基于坐标变换技术的宽角扫描相控阵天线测量的新方法,用于解决常规平面近场测量方法难以对宽角扫描相控阵天线进行精确测量的问题.在对用于宽角扫描相控阵天线测量的坐标变换技术进行理论分析的基础上,采用计算机模拟对该测试方法进行了数值仿真,制作天线实物进行了试验验证.数值仿真结果和试验结果均表明,该方法用于宽角扫描相控阵天线的测试具有较高的准确性.     

Rigid-Flexible Coupling Dynamic Analysis of Sub-Launched Vehicle During the Vertical Tube-Exit Stage

During the launching stage,hydrodynamic pressure and adapters’ reaction loads can influence the vehicle’s rigid motion as well as cause its structural vibration,which is a typical rigid-flexible coupling dynamic problem. This paper presents a 2-D rigid-flexible coupling model to calculate the vehicle’s dynamic responses in that period.The vehicle was equivalent to a flexure beam with axial deformation. Hybrid coordinate and modal superposition methods were used to describe its large rigid displacement and small deformation. By the second Lagrange equation,the vehicle centroid’s displacements,rotational angle and modal coordinates were chosen as generalized coordinates and then the vehicle ’s rigid-flexible coupling dynamic equations were obtained. By numerical simulation,the results of vehicle’s motion parameters and transverse internal loads were acquired.The calculation results showed that differences of the vehicle’s motion parameters between the rigid-flexible coupling model and the rigid body assumption are noticeable and the peak magnitude of the vehicle’s transverse internal loads in the rigid-flexible coupling model is higher remarkably than that in the rigid body assumption.     

一种大地坐标变换近似算法

机载雷达数据处理系统需要频繁使用大地坐标变换算法将测量数据转换到公共参考坐标系下。针对精度要求相对较低的机载预警雷达系统,本文提出一种近似大地坐标变换算法以解决常规算法的计算复杂度大、难以实现等问题。Monte Carlo仿真结果表明:本文所提算法精度损失较小,计算复杂度低。     

火焰化学气相沉积法制备多晶纳米二氧化钛及其在气体净化中的应用

综述了作者近年来在火焰化学气相沉积(CVD)法制备多晶纳米二氧化钛及其在光催化气体净化中应用的研究成果。总结了以工业丙烷为燃料、空气为催化剂、四氯化钛为先驱物的火焰CVD法制备多晶纳米二氧化钛中热负荷对燃烧室内的温度分布和金红石含量的影响。以光致发光(PL)光谱为表征手段,研究了金红石含量对光激电子和空穴的分离作用。用管式光催化反应系统,研究了初始浓度和相对湿度对多晶纳米二氧化钛光催化降解挥发性有机物(VOC)气体和氨气的影响,及最佳光催化效率的金红石含量。针对多晶纳米二氧化钛在低相对湿度下光催化降解效率低的缺陷,用复合法对其性能进行了改进,研究了改进的光催化剂在低相对湿度和干燥空气中光催化降解苯的效率。对500 m3/h模块化的填料式光催化气体净化设备进行了净化效率和催化剂寿命实验,讨论了光催化饱和浓度对净化设备设计的影响。     

基于PR控制器的APF电流跟踪控制策略研究

分析了基于同步谐波旋转坐标系下的电流跟踪控制策略,研究基于PR控制器的静止坐标系下的电流控制方法。理想的PR控制器在谐振频率下增益为无穷大,可以实现谐振频率相同的正弦信号无静差控制。因此,在PI控制的基础上通过分析并联谐振控制器,实现对特定次谐波进行重点补偿。     

Optimal paths planning in dynamic transportation networks with random link travel times

A theoretical study was conducted on finding optimal paths in transportation networks where link travel times were stochastic and time-dependent（STD）. The methodology of relative robust optimization was applied as measures for comparing time-varying, random path travel times for a priori optimization. In accordance with the situation in real world, a stochastic consistent condition was provided for the STD networks and under this condition, a mathematical proof was given that the STD robust optimal path problem can be simplified into a minimum problem in specific time-dependent networks. A label setting algorithm was designed and tested to find travelers＇ robust optimal path in a sampled STD network with computation complexity of O（n2＋n·m）. The validity of the robust approach and the designed algorithm were confirmed in the computational tests. Compared with conventional probability approach, the proposed approach is simple and efficient, and also has a good application prospect in navigation system.     

大豆蛋白改性维纶纤维的电学性质研究

为了降低大豆蛋白改性维纶纤维在纺纱过程中的静电现象,通过测试不同温湿度状态下的大豆蛋白改性维纶纤维的比电阻,对大豆蛋白改性维纶纤维的质量比电阻与温湿度条件间的关系进行实验研究。实验结果表明,大豆蛋白改性维纶纤维和普通维纶纤维的质量比电阻随着相对湿度和温度的升高而降低;大豆蛋白改性维纶纤维和普通维纶纤维的质量比电阻对数,随着相对湿度和温度的升高而降低,而且相对湿度在60%以上及温度在30℃以内时,大豆蛋白改性维纶纤维的质量比电阻及质量比电阻对数低于普通维纶纤维,降低程度较明显。因此,适当提高温湿度条件,可以使纤维纺纱时的静电问题得到控制。该研究为大豆蛋白纤维纺织生产提供了理论依据。     

实腹式巨型框架与空腹式巨型框架抗震受力性能对比研究

运用有限元分析软件SAP2000对实腹式巨型框架与空腹式巨型框架的抗震受力性能进行地震反应的弹性时程分析,比较实腹式巨型框架与空腹式巨型框架抗震受力性能的差别;为简便起见,本文只比较实腹式巨型框架梁与空腹式巨型框架梁的不同抗震特性.分析表明,空腹式巨型结构在受力性能上要优于实腹式巨型结构.