传动件试验台加载系统述评

介绍了开式试验台、电封闭试验台和机械传动封闭试验台的加载原理,并对其性能及应用选型进行了分析。     

Study on Functional Testing State Sets for 32-bit Microprocessors

Based on the functional fault model of instruction decoding in microprocessors,this paper Slyes the properties of the tasting state set should have for any type of instructions and presents the method to construct such testing state sets.     

Breeding widely adapted, popular maize hybrids

Summary World trend is to more maize hectarage grown to fewer, more widely-adapted hbrids. My purpose is to document research events leading to the most popular corn hybrids, Pioneer Brand 3780 and 3732. I provide background on maize adaptedness, on the seed maize business, on commercial maize hybrid development process, and on cultural practice change. I provide historical information on the cultivars: Leaming corn, Reid Yellow Dent, and Minn. 13 were widely-adapted open-pollinated varieties. Shift from open-pollinated to hybrid maize caused a shift in emphasis from local to wider adaptation. The first widely-adapted hybrids were Iowa 939 and U.S. 13. DEKALB 404A was the first popular and most popular double-cross hybrid. Pioneer 349 was the second-most popular double-cross hybrid. The first popular single cross hybrids were DEKALB 805 in medium and DEKALB XL45 in early U.S. Corn Belt in the early-1960's. Cultural practices (higher planting density, narrower rows, more nitrogen, better pesticides, and larger equipment allowing more timely operations) changed greatly in the 1960's and 1970's; allowing fewer, more widely-adapted genotypes to prevail. First hybrid 3780, then 3732 became the most popular hybrid; each exceeded one billion (1 × 10⁹) dollars sales. They were the result of wide-area testing, of utilizing higher plant density stress for selecting inbred lines and for screening hybrids, and of modern information management.     

Development of Static Characteristic Automatic Testing System About Brake Valves of Automobile

This paper describes a PC controlled brake valve automatic testing system which uses industrial control(computer) and Advantech powerful date acquition card PCI-1710L,and chooses Advantech PCI-1730 as the I/O card,(uses) FUJI servo systrm as the transmission mechanism.The system monitor the brake valve's quality based on analyseing the static characteristics of the brake valve.The authors also introduce the principle and structure of the system,hardware and software design process.The system works well in practice.     

The effect of variation of genetic variance and correlation between mean and variance on efficiency of bulk yield testing

Summary Computer simulation techniques were used to examine the effect of variation of genetic variance and correlation between mean and genetic variance on the efficiency of bulk yield testing procedures. Assessment of the effect of variation in various parameters was made by comparing genetic gains with the maximum potential gain. The maximum potential gain was defined as that which would be achieved if the particular bulk which maximizes genetic advance were chosen for selection.Maximum potential gains increased with increasing mean genetic variance within bulks but showed only a slight response to increasing variation of the within bulk genetic variance. Negative correlations between bulk mean and genetic variance reduced maximum potential gains and positive correlations increased them but the effects were not large.A selection intensity of 5% among bulks seemed close to optimal for a wide range of parameters. Slightly more intense selection may be an advantage where the between bulk heritability is high, the within bulk variance is high, and the correlation between bulk mean and variance is high and positive.     

ZL50装载机冷却能力的智能控制研究

分析了装载机传统冷却方式的缺点，通过改进散热器布置方式及节湿器结构，并加装了电风扇，利用单片机对电风扇及电控节温器进行智能控制，实现了装载机冷却能力随其散热需要而自动调节，改善了其工作性能。     

农产品品质无损检测概述

农产品品质无损检测是保证农产品质量和安全的一种新兴的高科技技术,本文介绍了常用的无损检测方法,综述了无损检测技术在不同农产品的品质检测中的应用,提出了未来的研究方向。     

核酸检测在猪病检测中的常见问题与分析

2020年突如起来的新冠肺炎疫情使“核酸检测”进入了公众的视野,但在核酸检测中,部分病例在不同时间经2次以上的检测后结果由阴性转为阳性,这种现象的出现给临床诊断和疾病控制带来了极大的困扰。同样,在猪病的核酸检测中,假阴性问题亦普遍存在。新病毒的确认时间周期长、采集的待检样品不合格、核酸提取效果差是出现上述现象的主要因素。因地制宜地制定样品采集方案,试剂盒质量可靠,监督环节不缺失等,是输出合格检测结果的重要保障。     

管道3PE防腐层技术标准对比分析

针对3PE涂层在国内管道工程应用中存在剥离的现象,对国内外3PE涂层相关标准及技术规格书进行了对比分析.从涂层结构、原材料指标、涂装工艺评定和涂装表面要求及质量检验等四个方面,对比分析了主要技术指标的差异,重点考察了环氧层、表面要求以及长期阴极剥离等指标对3PE涂层质量控制的影响,提出了今后需要进一步改进的性能指标.     

基于移动GIS的施肥推介系统研发

在基于GeoDatabase的成果数据库和基于ArcGIS Server的移动数据服务的支持下,利用ArcGIS Mobile 9.3组件和丰缺指标法施肥模型,开发了面向导航型PDA的施肥推介终端软件,以满足人们随时随地获取施肥信息的需求.