水利工程电气自动化系统防雷措施分析

电气自动化系统是科技发展的产物,近些年来在社会各个领域均有所普及应用,诸如水利工程,便可以借助电气自动化系统来实现对水利设备运行状况的监视与控制。对于水利工程来说,电气自动化系统的重要性可谓是不言而喻,一旦其出现故障将会带来巨大的损失。在现实运行中,水利工程的电气自动化系统常因雷电带来的破坏和干扰而无法正常工作,对此需要强化电气自动化系统的防雷能力。文章以水利工程的电气自动化系统为研究对象,探究相关防雷措施,以提升其在雷雨天气中的安全运行系数。     

刍议电力计量系统的防分流窃电技术

进入新时期以来，国内经济取得较快的发展，人民生活水平得到了较大的提升，对于电量的需求也越来越大，部分个人和企业在利益的驱使之下，使用了各种窃电技术来降低自身用电成本，给整个电力系统的正常运行带来较大的危害。文中从电力计量系统论述入手，分析了窃电的危害及方式，并重点分析了电力计量系统的防分流窃电技术。     

Infections Investigation of ALV and REV in Guangxi Local Poultry Breeds and Sequence Analysis of gp85 Gene of ALV Isolates

In order to investigate the infection status of avian leukosis virus (ALV) and avian reticuloendotheliosis virus (REV) in the major local breeds of Qinzhou,Guangxi,totally 953 samples of egg white,cloaca swab and serum of Ma duck,Shitou goose,Tiejiao-Ma chicken,turkey and pigeon were collected from the representing flocks and detected by the commercial ELISA kits.ALV was isolated for the ALV p27 positive samples by culturing on DF-1 cells,and gp85 gene was sequenced.The results showed that the detections of ALV were negative in the samples except those of Tiejiao-Ma chicken,while REV antibody was found positive in Ma duck,Tiejiao-Ma chicken and turkey.The nucleotide sequences of gp85 gene of two isolates shared 94.5% identity with each other,and shared 86.9% to 94.9% with reference strains.The amino acid sequences of gp85 gene of two isolates shared 91.5% identity with each other,and shared 84.0% to 91.6% with reference strains.There were many variable sites in the hyper variable region hr1 and hr2,and the vr2 and vr3 variable regions were relatively conservative.Phylogenetic tree analysis showed that the two isolates shared the highest homology with SCAU11-XG strain.     

浅谈混凝土拌合站配料计量系统的常见故障

近年来我国房地产行业的迅速猛发展带动了建筑行业的快速发展，现代建筑也多是钢筋混凝土结构，尤其是混凝土工程技术，在建筑工程界很受重视，其质量的好坏直接影响着建筑物的质量，做好其相关施工设备的日常维护，可以避免其故障的发生，确保混凝土拌合站正常稳定的工作。在混凝土拌合站的相关设备中，配料计量系统是整个混凝土搅拌施工工程的基础，其能够对混凝土的材料配比做出准确的估算及称重和上料，可以实现混凝土拌合站的自动化及集中化，从而对混凝土工程施工的质量和效率都有提高作用。本文中针对混凝土拌合站中的配料计量系统的基本特性进行了简要的介绍，后详细的分析了配料计量系统使用中易发生的故障以及相应的处理措施。     

兴义市旱地主要作物复种系统增产增效技术研究

通过实施兴义市旱地主要作物复种系统增产增效技术研究,结果表明:两年累计完成示范面积46.57hm~2,玉米平均产量7 761kg/hm~2,平均产值42 280.5元/hm~2;带动面积累计完成1 345hm~2,玉米平均产量7 521kg/hm~2,平均产值32 530.5元/hm~2。示范区比项目区玉米平均增产240kg/hm~2,增3.19%,平均产值增9 750元/hm~2,增29.97%。     

如何有效提升天气预报准确性

随科技水平的不断提高,天气预报的准确性也在不断提高,但目前天气预报服务需求与准确性之间不符的现象较为突出。基于此,探讨如何有效提升天气预报准确性,为人们的日常生产、生活提供服务。     

玉米收获机液压割台设计

随着现代农业机械化的发展进步,液压技术在农业机械中的应用越来越多,收割台是收获机的关键部件之一,摘取果穗的工作主要是收割台完成的,收割台的设计对收割效率有着至关重要的影响,本文介绍了一种自行走式玉米收获机液压割台。     

小议弓网离线电弧电磁干扰

随着列车运行速度的提升和电气化铁路的发展,计算机通信与信号的传输越来越普遍,电磁环境变得日益复杂,而由电弓离线电弧引起的电磁干扰问题逐渐已经成为制约高速铁路发展的一个重要因素,不仅可以可以借助模型仿真来对电磁干扰的特性进行分析,而且还能够借助测试这一有效的手段对问题进行研究。鉴于此,本文主要对弓网离线电弧电磁干扰问题进行了详细的分析和研究。     

Analysis on Genetic Diversity and Phyletic Evolution of mtDNA Cytb Gene in Zhongdian Yak

In order to investigate the genetic diversity and the origin of evolutionary relationship of Zhongdian yak,we analyzed the complete sequence of 15 individuals Cytb gene,its sequence polymorphism was analyzed,and the phylogenetic tree was constructed.The results showed that the length of the nucleotide sequence were 1 140 bp,with nucleotide frequencies of 26.3%,31.8%,13.1% and 28.8% for T,A,G and C,respectively.Three haplotypes were identified of 15 individuals,with 3 polymorphic sites,including two conversions,one transversion,haplotype diversity was 0.2571 and nucleotide diversity was 0.00035.Phylogenetic analysis suggested that Zhongdian yak and Bos mutusc clustered firstly,then gathered with Bison bison,which indicated that there were high genetic similarity and closer genetic relationship,genetic similarity with other cattle genus was relatively low.Combining with the proof of molecular biology and paleontology,the result supported the point that Bos grunniens and Bos mutus were classified as an alone genus in Bovinae.     

基于RCS3200的棉籽分级系统优化设计与试验

为了提高脱绒棉籽清选分级的精度,设计了一种基于颜色传感器的脱绒棉籽分级系统。通过RGB三基色传感器RCS3200对棉籽的外部三基色信息进行采集,单片机控制传感器采样,并对采集来的信息进行去噪处理,确定棉籽的等级,单片机作出相应的决策,控制气流装置,将棉籽打入相应的等级箱。结果表明,该棉籽分级系统有很强实用性。