甘肃农业大学农耕特色库

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唐代前期河西州县城城防研究: 作者： 张向红 来源： 西北师范大学 年份： 2010 文献类型： 学位论文 关键词： 河西州县城唐代前期城防; 描述： ch as the important town of the Silk Road, multi-ethnic coexistence and the border district administrative center. In order to ensure normal exchange between the East and the West, frequent contact among ethnicities, and effective administration in He-xi area, it was extremely essential to establish city defense. Therefore, the Tang government built the city defense system that was mainly military defense and based on social balance. Mainly included the screen protective system of Army, Shouzhuo, City, Town, Shu, etc., which had some focal point and very wide and located out of the cities; Three layers external protective system that was composed of a deep ditch to round every city, sheep and horses cities, city wall; Multiple structure system such Luo city(outer city), Zi city(inner city), fang(residential area), Shi(markets), and so on; Garrison inside cities and out of locality system; Feng, Yi and other information systems; General's office person of ability system; Warehouse reserve and social balance system. Because of the important geographical position strategic and the special social security problem, the He-xi Prefecture and county city defense had formed Trinity characteristic with the national defense and the security defense. The city defense soldiers had a hand in Tuntian to bring about He-xi area’s agricultural advance; A large number of people of city defense formed the consumer market, had promoted the prosperity of the commerce; The city defense ensured traffic and military assistance, made He-xi Prefecture and county cities become the rear base to administer Central Asia. However, the city defense had its limitation, such as impotent military might at times (it offered an opportunity of Tibetan expanded in north-west area), because of the condition between the country and the locality. It, to a certain extent, had influenced on the valid function of city defense.; 全文：唐代前期,在西北地区特殊的社会环境下,河西州县城体现出丝路重镇、多民族共处地、边地行政中心等诸多特征。为保证东西方正常交流、多民族之间的频繁交往以及唐在河西地区的有效统治,城防之设极为必要。因此,唐

新疆加工番茄抗黄瓜花叶病毒转基因技术的研究: 作者： 张瑜 来源： 石河子大学 年份： 2010 文献类型： 学位论文 关键词： RNA干扰系统进化树黄瓜花叶病毒; 描述： bution, one of the pathogenicity impaired crops. It has three genomic RNAs. So it is one of RNA virus model strains to investigate pathogenicity mechanism in host.; 全文：扩增黄瓜花叶病毒加工番茄NS04分离物的3个基因组部分序列,利用基因系统进化树分析发现基因组编码的四个蛋白：CMV-1a与日本的毒源AB179764同源性最高,核苷酸和氨基酸同源性分别为96.0

唐代丝绸之路演变与西北市场格局的变动: 作者： 袁黎明 来源： 陕西师范大学 年份： 2010 文献类型： 学位论文 关键词： 市场丝绸之路军事环境商业; 描述： 丝绸之路横贯东西，绵亘数千里，是古代东西方交通的大动脉，也是中国古代人民与西方各国通商、通使友好往来的贸易之路，它促进了东西方的经济文化交流，为中国乃至世界文明的发展做出了不可磨灭的贡献。唐朝是我国历史上的盛世时代，其政治、经济和文化发展水平都处于世界领先地位，自信的中国人以博大的胸襟、开放的姿态与; 全文：的变动。从总体上看，在安史之乱以前，唐代丝绸之路全线畅通，东西方贸易频繁，丝路沿线的市场也得到很大发展，沿线的州县治所多发展成为重要的商业城镇。在隋朝和唐初，沙州和甘州是河陇地区著名的商业中心，长安年间

中国古代害虫观念与防治技术研究: 作者： 龚光明 来源： 南京农业大学 年份： 2010 文献类型： 学位论文 关键词： 观念防治技术农作物害虫中国古代; 描述： 中国古代以农立国,农业丰歉直接关乎社会稳定、人类幸福。因此,农业害虫一直受到关注,人们不断探索、总结其规律及应对措施。在生产实践中,害虫观念、防治技术在继承的基础上不断发展与更新。不同时期害虫观念的变化对防治政策的制定及防治技术的实施产生深远影响。古代农业害虫以蝗、螟、好蚄及未知名害虫为主,次数依; 全文：更趋制度化。多次颁布法令,责成地方官于虫蝻生发时扑打、申报。并诏令州县正官通过翻耕或焚烧解决蝗卵问题,以防次年滋生蝗灾。陈旉从气的运行原理认为害虫是气的正常运行受到破坏、偏离常规所致。董煟则主张针对蝗虫

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