The overexpression of cytochrome P450 genes confers buprofezin resistance in the brown planthopper,Nilaparvata lugens (Stål)     

Bin Zeng  Ya-Ting Liu  Ze-Rui Feng  Fu-Rong Chen  Shun-Fan Wu  Chris Bass  Cong-Fen Gao 《Pest management science》2023,79(1):125-133

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An Information System for Vehicle Transport Management     

Zeng Fanqi Zhou Ming Wang Yong 《保鲜与加工》1993,(4):150-154

This paper proposes a model framework, which describes the function requirements and the common characterstics of vehicle transport management. With the frame, a computer vehicle transportation managerment information system(QCMIS)is in troduced here and it has already been put into practice. The key technical points is also explained in the paper.  相似文献   

A STUDY OF THE SENSITIVITY OF BIQUADRATIC SWITCHED CAPACITOR FILTER     

Zeng Xiaoping 《保鲜与加工》1991,(4):46-52

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Numerical Simulation of Flow field and Temperature field in Combustion Chamber Widened Suddenly     

Wu Chenbo Liang Xiaoping 《保鲜与加工》1997,(2):117-122

The flowfield and temperature field are numerically Simulated by the mathematical model of the fluid flow and heat transfer in circular combustion chamber widened suddenly. The distributions and influence factors of the flow field and temperature field are studied in it. The results have the guiding significance for the design of combustion chamber. The mathematical models can serve as the quantitative analysis methods for design.  相似文献   

Detection of Edges within the Cross Sectionfrom Projections of Parallel Beams Via the Wavelet Method     

Zeng Li  Yi Dong  Chen Tinghuai 《保鲜与加工》1996,(6):85-89

The wavelet analysis are used in the detection of edges within the cross sectionfrom projections of parallel beams. This method can be applied in computerized tomography (CT) inorder to reduce the noise and the number of projections.  相似文献   

兰花选育种研究进展   总被引：5，自引：0，他引：5  

曾碧玉  朱根发  刘海涛 《中国农学通报》2005,21(12):272-272

兰科植物为单子叶植物中最大的一个科。全国各地极其重视资源的调查、收集与驯化及其外来品种的引进；已有17个种的兰花种子成功运用超低温技术贮存；染色体分析技术及分子标记成为资源评价的重要手段，应用于研究兰科植物的亲缘关系及其遗传多样性这两方面的研究报道较多。兰花育种以传统的人工杂交为主，通过人工杂交已获得大量种间、属间杂交种；多倍体育种方法及生物技术作为辅助手段应用于兰花育种，获得了多倍体植株及转基因植株。  相似文献   

茶树钾营养特性的研究   总被引：5，自引：0，他引：5  

王晓萍  阮建云 《作物学报》1995,21(3):324-329

本文对我国主要茶区茶园土壤的含钾状况，茶树品种和土壤水分对茶树吸收钾的影响和茶园施肥钾肥的增产效果进行了系统研究。结果表明，我国有近６０％的茶园土壤处于罐钾状态，这已成为限制茶叶高产优质的主要障碍因子之一。不同品种茶树对钾的吸收具有明显差异，它们对钻的最大速率Ｖｍａｘ为龙井４３＞碧云＞苹云＞碧峰＞菊花春，米氏亲和常数Ｋｍ为碧峰＞碧云＞龙井４３＞苹云＞菊花春。干旱处理的茶树体内累积的钾和叶片的含钾量  相似文献   

高产小麦品种模式化选育的初步研究   总被引：4，自引：0，他引：4  

陈化榜  曾北燕 《作物学报》1993,19(2):165-172

本文探讨了高产小麦品种理想模式的概念、特点和品种模式化选育的理论依据及优点。对37个亩产400公斤以上的高产品种的产量与其构成因素、形态性状、生理性状以及这些性状之间的关系进行了多元和简单相关分析。针对山东的生态条件和品种的现状，优化了亩产600-650公斤的品种模式。探讨了各类性状间的有机联系和协调发展产量潜  相似文献   

The Method of Diagnosing Brain-dysfunction Based on Membership Function and BP Neural Network     

Zeng Xiaoping  Zou Jiaqi  Zang Anbang 《保鲜与加工》1996,(3):44-49

Membership functions.formed with the characteristic values obtained by applying the continuous reaction time (CRT) theory from controls and heptic encephalopthy and proposedin this paper.whith these membership functions,the CRT data to be diagnosed are calculated in advance,and then discriminated by BP meural network to differentiate patients with or without braindysfunction.The troubles of low accuracy and efficiency,encountered in training BP network withfuzzy samples.scattered data and extended samples,are solved.  相似文献   

小麦随机多交后代中抗条锈(Puccinia striiformis)性的选择   总被引：1，自引：1，他引：1  

冯锋  曾士迈 《作物学报》1991,17(2):107-114

本试验用16个被认为可能具有水平抗性的小麦品种为基础材料,采用乙烯利化学杀雄或太谷核不育为手段进行随机多交,以相对抗病性综合指数(RRCI)表示抗病性强度,研究了小麦条锈病水平抗性的遗传力及人工选择下的遗传进度,结果指出:1)随机多交的后代系统中,出现了一些抗条锈性显著高于优良亲本的系统。2)抗条锈性的遗传力较高:化  相似文献