基于太阳能供电的有机蔬菜打码机研究

农产品质量安全受到了越来越多的关注,无污染、富营养和高质量的有机蔬菜无疑是消费者的最好选择,但是,有机蔬菜价格较高,为普通蔬菜的2~3倍,进入普通老百姓的饭桌还需要价格下调。本文以降低有机蔬菜价格为宗旨,研究了有机蔬菜打码机的太阳能供电系统,设计了有机蔬菜追溯码,实现农户田间地头直接打印追溯码,降低有机蔬菜的生产成本。     

多分屑槽钻尖的数学模型

多分屑槽钻头适合大走刀量高效率钻削加工，为解决多分屑槽钻尖在数控机床上的刃磨问题，建立了新型钻尖（多分屑槽钻尖）的数学模型，介绍了分屑槽钻尖数学模型的求解方法。     

载货汽车制动毂自动冷却装置实现原理分析

 通过对载货汽车制动的基本结构和原理的分析,结合云南山区道路坡大弯多,制动负荷大的特点,提出了载货汽车制动冷却自动控制装置的方案,并对该自动控制装置中的传感器、放大器、A/D转换器、D/A转换器、执行元件进行了分析。     

基因芯片技术在晋南牛种公牛选育中的应用

为了更好的保护开发利用晋南牛,确保晋南牛的遗传多样性,本研究应用基因芯片技术,对晋南牛进行群体遗传特性的检测及后备种公牛的遗传评估,为晋南牛的分子辅助选育与保种提供理论与技术支持。采集18月龄健康、体重相近（（350±20）kg）的荷斯坦牛、和顺肉牛、西门塔尔牛、延边牛及利木赞牛血样各10份,及晋南牛后备公牛血样25份,根据不同牛品种分为6组,其中前5组每组10个重复,晋南牛后备公牛25个重复。应用Illumina SNP 50K高密度牛SNP芯片进行基因型检测,分析比较晋南牛的群体遗传特征,运用亲缘矩阵计算晋南牛后备公牛的亲缘系数,同时用BLUP进行遗传评估。结果表明,晋南牛在遗传结构上与荷斯坦牛、和顺肉牛、西门塔尔牛及利木赞牛关系较远,与延边牛较近,为中国地方品种群体;对晋南牛后备公牛进行遗传评估,得出了牛的基因组胴体重方差育种值排名,JN23的胴体重倍数性状标准差最大,从基因组水平可选作肉用种公牛;应用亲缘分析对晋南牛后备公牛家系进行分类,避免群体间的近交。本研究对晋南牛后备公牛进行了遗传评估、近交家系分析、传统表型选择及遗传疾病检测,最终选留的种公牛为JN07、JN23、JN05、JN08、JN02、JN13、JN19、JN14,通过多种选育方法结合提高了公牛的选择准确性,为晋南牛的群体选育提高奠定了基础。     

电喷发动机控制系统硬件设计

根据电喷发动机需要采集的信号设计相应的硬件和软件，将此信号经过I／O接口送入微机，控制单元完成对各种信号的采集、处理和储存；在输出通道中，设计发动机电喷系统执行器的相应功率驱动电路；最后编制相应的调试程序实现对输入输出通道的调试。     

一种新环保节能型软启动器系统

介绍了一种以80C196KC单片机为核心，利用晶闸管交流调压电路来实现的环保节能型电机软启动器系统的原理、结构和应用，并给出了系统的软硬件设计。该系统结构简单，参数调整灵活，能平滑、无级地起动三相异步电动机，是一种集电机软起动、软停车、轻载节能和多种保护功能于一体的新颖电机控制装置.     

多通道鱼苗计数器光电微机控制系统设计

介绍了多通道鱼苗计数器采用光／电／微机一体化设计原理及方法，并给出主要电路程序框图，通过对任一单通道试验结果表明，测鱼管径大小是影响鱼苗计数器准确性的关键因素。     

DNA芯片技术应用研究进展

DNA芯片技术是近年迅速发展的一门生物高新技术 ,其突出特点在于高度并行性、多样性 ,即能一次性对生物遗传信息进行大规模的快速、同步分析。DNA芯片技术目前已用于基因重复测序、基因表达分析、新基因的发现、基因单核苷酸多态性 ( SNPs)研究、基因诊断、药物筛选等领域 ,而且其应用范围还在不断扩展。本室运用这一新技术 ,检测水稻在受水稻黄单胞菌水稻致病变种及该菌株的 rpf C基因缺失突变体感染时基因表达的差异 ,发现一些基因可能与水稻抗白叶枯病相关     

Study on Single-chip Computer Control Systems in Miniature Water Works

In order to enhance automation and to design low price and performance reliable control systems for the miniature water works, the single-chip computer control system was adopted to control the work. The single chip computer control system in the miniature water works, the principle of the hardware and a part of software block diagram were discussed in this paper. Finally, the data acquisition and control network were introduced.     

Genetic advance for chip colour in potatoes

Summary The objective of this study was to investigate the response to selection for chip colour after harvest (CH), storage at 12.8°C (CR) and at 3°C (CC) in three hybrid populations. Population 1 was derived from crossing ND860-2 (cold chipper) with F58089 (regular chipper), Population 2 was obtained from crossing ND860-2 with Russette (nonchipper), and Population 3 was derived from crossing Russette with F58089. Eighty-five to ninety-six random clones for each population plus ten check cultivars were planted in 1991 at two locations in East Canada. For CH, Population 3 had the highest predicted gain. No genetic variation for this trait was detected in Population 1. The potential genetic advance by selection within Population 1, as measured by the predicted mean of the selected clones, however, was similar to the others because Population 1 has a higher mean. For CR, Populations 2 and 3 had similar expected response estimates. Population 1 had no genetic variation for CR but showed similar potential advance to Population 2 and higher than Population 3. For CC, Population 2 had the highest predicted gain. The predicted means of selected clones of Populations 1 and 2 were higher than that of Population 3. Consequently, Populations 1 and 2 had greater potential for improvement for CC than Population 3.