基于GSM的短信报警收发平台设计

介绍GSM移动通讯系统的AT指令,GSM短消息的格式、编码和解码方法,在此基础上在上位机搭建起电力监控系统短信报警平台,通过GSM移动通信网络,实现了上位机与短信报警终端的实时通信,从而得以对郊外无Internet网络覆盖地区的电力电缆进行实时监控和报警.同时,对短信息内容的分类、设计和识别也进行了一些探讨.     

Electronic and magnetic properties of Mn-doped ZnO: Total-energy calculations

Based on the spin generalized gradient approximation (σGGA) of the density functional theory (DFT), the structural, magnetic, and electronic properties of Mn-doped ZnO structure have thoroughly been investigated. It is found that the Mn atom prefers to substitute one of the Zn atoms, producing the energetically most stable configuration for the Mn-doped ZnO structure. Employing the Hubbard potential within the calculations suggests various changes and modifications to the structural, magnetic and electronic properties of the Mn-doped ZnO. Our calculations reveal that the local magnetic moment at the Mn site using the ordinary σGGA functional is 4.84 μ_B/Mn, which is smaller than that evaluated by including the Hubbard potential of 5.04 μ_B/Mn. Overall, the electronic band structure of the system, within the σGGA+U, is half-metallic, with metallic nature for the majority state and semiconducting nature for the minority state. Simulated scanning tunneling microscopy (STM) images for both unoccupied and occupied states indicate siginficant brightness on both Zn and Mn atoms and much brighter protrusions around the O atoms, respectively.     

Ag掺杂对TiO_2性质影响的第一性原理研究

采用Ag原子对锐钛矿型TiO2半导体进行掺杂,利用基于密度泛函理论的第一性原理研究了Ag掺杂TiO2的晶体结构和能带结构.计算表明,Ag掺杂导致TiO2电子局域能级的出现及禁带变窄,从而导致吸收光谱红移.同时对Ag、Cu这两种同族原子进行掺杂比较,结果证明,用Ag原子对锐钛矿型TiO2进行掺杂在提高光催化性能方面效果更好.     

基于行为树的指挥控制流程建模框架

为了减少人为因素对仿真结果的影响,经济、客观的实现仿真目标,建立智能、真实、可靠地指挥控制流程模型是作战仿真系统开发的重要研究内容。通过对系统工程方法的研究结合行为树技术,提出了一种基于行为树技术的指挥控制建模框架。对框架结构和应用流程进行了介绍,并对行为树建模常见的问题和解决优化方法进行了阐述。     

物联网环境下的指挥车智能防火系统

针对指挥车内部火情报警和智能处理的问题,研究了物联网环境下的指挥车智能防火系统,研究包括：智能防火系统模型的构建,火焰报警信号的检测,火焰报警信号的智能识别和处理策略,指令数据的网络通信以及编码和解码规则。硬件以STM32为处理核心,采用红紫复合传感器和烟雾传感器采集特征信号,构建BP神经网络算法模型对特征信号进行识别,通过专家智能控制方式进行处理,提出了一种物联网环境下的指挥车内部智能防火方法。通过实验结果表明,该系统能够在无人状态下,对指挥车内部的火焰信号进行智能检测并做出防火处理。     

NbC固体表面能带和电子结构的理论研究

采用DFT/BLYP方法对NbC(001)和(111)面的电子结构进行研究。计算结果表明,对于NbC(001)表面,其表面态主要集中于费米能级(EF)下方约4.5eV附近区域,并以表面Nb原子和C原子为主要成分。O2分子在该表面吸附时,趋向于吸附在表面Nb原子上。对于NbC(111)表面,其表面态集中在EF下方0.02.0eV区域,靠近EF的态具有较高的表面活性,其主要成分为表面Nb原子的4dxz/dyz成分。上述结论与光电子能谱实验结果基本一致;但由于金属原子d电子数的差异导致NbC(111)表面态成分与类似的TiC化合物并不相同。     

A density functional study on the electronic structures of TiN solid

The electronic structures of TiN bulk have been studied by using different theoretical formalisms, and the DFT method, especially the BLYP method can produce reasonable results. The band structure of TiN (001) surface is also investigated and two a type surface states are presented in our results. The state located at 2.9 eV below EF in angle resolved photoemis-sion in (ARPES) is well reproduced in this work, which consists essentially of 2pz orbital of surface N atom. Another surface state is associated with the bands originated from 3d orbital of surface Ti atom. Furthermore, the elastic constants of TiN are also calculated by using BLYP method.     

基于SDCN算法的鲁棒性语音命令识别

提出了一种基于ＳＤＣＮ算法的鲁棒性语音命令识别。依赖于信噪比的倒谱正常化（ＳＤＣＮ）算法直接在倒谱域根据输入语音帧的信噪比（ＳＮＲ）来增加一补偿矢量,从而恢复未受污染的净语音信号,补偿矢量直接从训练环境和测试环境中记录的语音倒谱中逐帧比较得到,该算法对退化的环境具有很强的鲁棒性,实验结果证明,该算法简单,有效。