The Separation of Similar Frequency Sinusoidal Signal Based on the Least Square Method

传统的快速傅里叶变换(FFT)可以有效地对正弦信号进行分析,但对于分析频率相近的正弦信号却存在很 大的误差。该文提出了采用最小二乘法来分析该问题。该算法在观测矩阵的基础上,利用2范数最小的终止准则, 通过求解超定方程组,辨识频率相近信号组成的特征参数。仿真结果表明,该方法可以精确地分析频率相近信号各 组成部分,有效地抑制噪声的干扰,具有较好的噪声稳定性和频域分析能力,从而提高信号处理的效率与精度

Method of Improving Precision in Spectrum Analysis of Roll Eccentricity Signal

针对目前冷轧生产中因轧辊偏心引起带材厚度波动的问题,提出了一种提高轧辊偏心信号频谱分析精度的方法。该方法综合应用伪点剔除技术、抗混滤波技术和平滑趋势技术对原始轧辊偏心信号进行预处理,再使用改进的快速傅立叶变换算法对预处理后的信号进行分析,其频谱分辨率明显提高。现场测试表明,经该方法分析ABB压头采集到的轧辊偏心信号,其频谱分辨精度明显高于以往用快速傅立叶变换算法的分辨精度,从而可以快速准确地诊断轧辊偏心所造成的影响

The identification of Epinephelus malabaricus and E.coioides based on DNA markers

针对在分类上存在混淆的点带石斑鱼和斜带石斑鱼,在形态学基础上,运用mtDNA Cytb基因扩增序列分析、RAPD、AFLP等分子标记技术对两种石斑鱼的遗传关系进行了研究.研究结果表明:(1)点带石斑鱼与斜带石斑鱼的分化已达到种间水平,mtDNA Cytb基因序列相似度为94.4%,AFLP扩增片段的遗传相似率为0.753 9;(2)两种石斑鱼存在杂交现象,RAPD、AFLP的扩增谱图中均获得亲本与子代的特异性条带,父本对杂交子代的遗传影响略大于母本;(3)AFLP标记在点带和斜带石斑鱼及其杂交子代中的遗传符合孟德尔遗传规律,可用于构建两种石斑鱼的遗传连锁图谱.研究结果将对两种石斑鱼种质资源的保护及人工繁育的可续性提供重要参考.Using multi-molecular marker technology and based on morphological criteria,the genetic relationship between E.malabaricus and E.coioides was examined in the hope of resolving the longstanding issue of identifying of these two species.Results showed that:(1) E.coioides and E.malabaricus should be identified as two species,the consistency of mitochondrial DNA cytochrome b gene sequence between E.malabaricus and E.coioides is 94.4%,the genetic similarity by AFLP was 0.753 9;(2)hybridization exists between E.malabaricus and E.coioides,the specific RAPD and AFLP fragments are found to be useful in the identification of these two species,the genetic properties(both with exterior and inheritance) of hybrid is significantly biased to the male parents;and(3)AFLP was a potentially powerful tool in constructing genetic linkage map for these two groupers.国家自然科学基金资助项目(40306023);; 福建省重大专项基金资助项目(2004NZ03

一种钼钒复合氧化物材料及其制备方法

本发明涉及一种钼钒复合氧化物材料的制备方法，将钒氧化物与钼氧化物按一定的化学计量比分散于一定量的去离子水中，然后加入一定量的双氧水，在20-80℃的温度下使之溶解，在50-80℃下，挥发干溶剂，得到固体粉末，将其在400-600℃预处理2-8h，后冷却，取出经研磨后在600-1000℃下处理4-120h得到该样品。该材料热稳定性好，比表面较大，可用作催化，电极，传感器等材料

Firmware protection method for wireless meter reading module of electric energy meter

本发明涉及一种用于电能表无线抄表模块的固件保护方法。计算关键代码段的CRC校验和，与预设的校验和比较如果计算所得的结果和程序中预设的不一致，则终止运行；如果计算所得的结果和预设的一致，则读取无线抄表模块的硬件特征信息；使用预定的计算方法计算特征信息，产生特征密钥；如果固件中预置的密钥写入方法没有被删除，则使用所述密钥写入方法将所述特征密钥写入固件中，将该写入方法删除；如果固件中的密钥写入方法已经被删除，则将产生的特征密钥与固件中的特征密钥比较，密钥一致则继续运行，否则终止运行。本发明方法简单易行，在利用硬件特征数据保证程序唯一性的同时，也保护了程序的完整性和合法性，使固件不易被破解

一种耐磨超疏水涂层及其制备方法

本发明公开了一种耐磨超疏水涂层的制备方法，包括以下步骤：(1)对金属基体表面进行清洗；(2)采用低表面能分子对要进行喷涂的粉末进行修饰，得疏水粉末；(3)利用真空冷喷涂技术在步骤(1)得到的金属基底上喷涂步骤(2)得到的疏水粉末，在基体表面得到所述的耐磨超疏水涂层。该方法采用真空冷喷涂的方法将制备得到的疏水纳米粉末直接喷涂到的金属基体表面，操作简单，沉积效率高。利用本方法制备得到的耐磨超疏水涂层的静态接触角可达到150～153°，滚动角小于3°

An Architecture and Joint Robot Group for a Long-Range Dynamic Combinatorial Flying Complex Based on Cloud Sea Computing in 5G OGCE

Based on the fifth generation of mobile communication (5G), 5G open grid computing environment (5G OGCE), in order to adapt to "civil-military integration strategy"in region from transoceanic flight to space, and to meet the needs of air-sea integration development, a joint (connecting or docking-and-berthing) robot group (JRG) and a long-range dynamic combinatorial flying complex (combinatorial aircraft) are presented by this paper, the aim of which is to provide range extension and improve endurance of a large combat blended wing body (BWB) stealth strategic bomber (SSB). With the support of an aircraft carrier at sea, the large BWB SSB with main part of JRG and stealth unmanned aerial refueling tanker vehicle (UARTV) with joining part of JRG can be joined dynamically together to combinate a flying complex, and achieve all-weather operations in the world. This JRG has the functions similar to the external fuel tank of the aircraft and the externally mounted cruise missile, and the externally mounted aircraft acts as the external fuel tank. By using transition and channel of distributed control cloud architecture of cloud sea computing (CSC) in 5G OGCE, to command and control (C2) and drive JRG, complete the joining (docking) between SSB and UAREV in a variety of standardized movements and operations. JRG can be used to connect the wings of large BWB passenger aircrafts and stealth manned or unmanned aerial vehicles (UAVs), for rescue and anti-terrorism

一种加速器高频数字低电平以太网通讯系统

<span style="color: rgb(69, 69, 69); font-family: Arial, Helvetica, sans-serif; line-height: 21px; text-indent: 24px;">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp;本实用新型涉及加速器高频数字低电平通讯系统及其工作方式技术领域，尤其是涉及一种加速器高频数字低电平以太网通讯系统。包括Nios?II处理器模块、片上RAM/ROM存储器模块、Avalon-MM三态桥模块、通用异步接收/发送接口（UART）模块、定时器模块、PLL锁相环模块和DMA控制器模块，各模块之间采用Avalon总线相连接，其特点在于还包括与Avalon总线相连接的环路控制寄存器组模块和以太网控制器（MAC）模块。其采用服务器/客户端模式，通讯过程中采用字符串式数据包格式，实现了数字低电平控制系统和上位机之间的以太网通讯，通过运行在上位机的客户端，可以对数字低电平环路控制系统的各项参数进行在线远程设置和实时监测。</span