灰色关联度法在烤烟品种重要性状综合评价中的运用

以2008年全国烤烟品种区域试验北方区参试品种的主要农艺性状、经济性状、化学成分、抗病性等调查记载数据为基础,应用灰色关联度法对各供试品种(系)的主要性状进行了综合分析。结果表明,灰色关联度法对于烤烟品种性状综合评价应用性较强,较以往的方法更系统、简洁、明了、易于操作;在等权关联度法和加权关联度法的对比分析中,得出加权关联度法结果更接近实际评价,从而说明权重对于灰色关联度法评价区试品种有着很重要的作用。     

混酸硝化法合成二硝酰胺铵及其机理探讨

介绍了二硝酰胺铵的合成路线,研究了混酸硝化法合成二硝酰胺铵时原料规格、原料配比、反应时间和反应温度对硝化反应收率的影响.当以规格5的氨基磺酸铵为原料,n(HNO3):n(氨基磺酸铵)=9.00,m(HNO3):m(H2SO4)=6.67,反应温度为-40℃,反应时间为45～65min时,操作较为容易,硝化反应收率≥55...     

基于总线的数控系统嵌入式热误差补偿实现方法

热误差是影响机床加工精度的重要误差源。简要介绍THK6370卧式加工中心主轴热变形的测量及建模方法,详细阐述热误差补偿在基于总线的数控系统上嵌入式集成的方法,提出热误差补偿模块的软硬件设计方案,并开发补偿模块。在THK6370上进行实验验证,结果表明,加工精度提高了30%。     

铣削过程中基于伺服电流信号的切削力监测

刀具破损和刀具磨损的自动检测是数控机床自动加工中的一个重要环节。基于伺服电机电流的切削力监控是一个有效的无传感器方法,该方法的关键是如何从伺服电流信号中准确提取切削刃的力波动表征信号。在对伺服电流信号进行时域、频域分析的基础上,基于可变加工参数给出实时提取切削刃力波动表征信号的方法,并通过相关实验验证了该方法的合理性。     

Study on original position statistic quantitative method for the content of Al in inclusions from steels

The inclusions of Al in steels have great influence on the properties and the quality of steels.But there are some difficulties on the content determination of Al inclusions with accuracy and rapidity.Conventional quantity analysis of stable inclusions is electrolysis method with the disadvantages of long analytical period,trivial operation and a little loss of some fine and instable oxides.The content of insoluble aluminum can be obtained by the subtraction between the content of total Al and acid soluble Al determined by chemical methods with the disadvantage of complicate procedure.Original position statistic distribution analysis(OPA) can be used for the determination of inclusions by collecting and discriminating the signals produced by single spark discharge in the way of no pre-sparking,scanning and emitting continuously.In this study the element of Al in some spectrum certified reference materials of carbon and medium or low-alloyed steels was analyzed by original opposition statistic distribution technique.Two quantitative mathematical models used by original position distribution analysis technology for the analysis of the content of Al inclusions have been investigated and been applied to the analysis of the content of Al inclusions in many kinds of spectrum certified reference materials and some medium and low-alloyed steel samples.The scope of application of the models and their limited conditions were discussed.It was found that the results calculated by OPA had great difference with the value by chemical method for some samples with the total content of Al above 0.2%.The reason is that some intensity of abnormal sparks have gone beyond the range of the largest intensity that can be determined by the instrument so that there is a certain deviation on the identification of abnormal sparks and the calculation of threshold value.It was found that the size distribution of Al inclusions had a great influence on the application of the two models.For most of certified reference materials for spectrum analysis and real steel samples the results of the content of Al in inclusions calculated by model 1 was satisfied and had good coincidence with the value of insoluble Al by chemical method. But for the samples with so many large inclusions of Al existed,the influence of intensity should be considered because the signal increase did not vary in the form of simple function.So model 2 was more suitable for the content calculation of Al in inclusions in this case.In order to choose suitable model to be used it is suggested that the size distribution of inclusions should be determined by OPA before content determination of Al in inclusions. The results of the content of Al inclusions calculated by the selected mathematical model were satisfied and had good coincidence with the value of insoluble Al obtained by the subtraction between the content of total Al and soluble Al determined by chemical methods when the content of total aluminum was below 0.2%.     

恩施州特色烤烟新品种筛选

为筛选出适合恩施州生态条件的特色烤烟品种,2009年在恩施烟区进行了品种区域适应性研究,对CF205、中烟100、中烟103、中烟201和云烟87的农艺性状、经济性状、外观品质及内在质量等进行了综合鉴定。结果表明,中烟103、中烟201和CF205在恩施州不同产区较好地体现了品种特性和经济效益,可以在恩施州烟区进一步示范验证。     

都市水供给安全远程监控与实时补偿系统的研究与开发

针对都市水供给在输送过程中会产生二次污染问题,进行了以下研究:利过传感器测定自来水中活性氯浓度;利过酸度计电路测定次氯酸浓度;利用温度传感器获取消毒液温度的数据。接着采用无线通讯模块实现数据的分析处理与信号的转换发送。根据中央接收系统接收的信号,由氯添加系统调整有效氯的添加比例,同时测试系统中简易的加液和紫外线消毒系统完成二次污染的实时控制。结合各个模块设计了系统软件,建立了系统测量模型。在实验室对系统软硬件进行现场模拟,结果表明测量精确度与系统对次氯酸浓度控制达到了设计要求。     

新型防污剂的合成、生物毒性以及防污性能的研究

介绍了N,N′-二苯氧乙氧基丙基二硫代二丙酰胺(PEPD)等5种二硫代二丙酰胺类化合物(PD)的合成,采用红外光谱(IR)和核磁波谱(1HNMR)对其进行了结构表征。并对这5种化合物进行了抑菌和杀藻的生物毒性研究,抑菌实验结果表明,5种受试化合物对大肠杆菌、金黄色葡萄球菌、裂殖酵母菌均具有较好的抑制效果,其中PEPD对3种菌株的MIC值分别为0.1250mg/mL、0.0625mg/mL、0.1250mg/mL;杀藻实验结果表明,5种化合物对湛江叉边金藻等4种藻类均具有较好的杀灭作用,其中以PEPD的抑制性能最显著,24h和48h的LC50分别为2.10μg/mL和1.55μg/mL。以5种化合物为防污剂制备了海洋防污涂料,5个月的实海挂板结果显示较空白板只有少量大型污损生物附着。     

基于SystemVerilog的网络处理器验证平台设计

描述了一种基于SystemVerilog的网络处理器验证平台设计.该验证平台基于VMM架构,采用SystemVerilog语言编写所需的验证组件和功能覆盖率代码,并在设计代码中插入断言(SVA),将两者结合起来,能够快速、准确的定位出网络处理器在执行过程中发生的错误,有效对其进行功能验证.     

基于“三双”模型的配电网规划辅助系统

提出了具有高可靠性的"三双"接线模式,设计了基于三双模型的配电网规划辅助系统.系统采用MVC(Model+View+Controller)开发框架,用面向对象方法对CAD文件进行解析、编辑和转换,实现了对整个配电网规划过程的覆盖,具有技术先进、功能全面、界面友好等特点,大大提高了规划工作的科学性,以及实用性和效率.在浙江电网工程实践中验证了该系统的可行性.