乐亭县农民和农业科技人员经过四年的生产实践,摸索出一套辣椒套玉米的高效栽培摸式。该模式既可避免因单一种植辣椒,在高强阳光下易感病害的缺欠,又可增收一茬玉米(一般可
In this paper, the finite element approximation of the Signorini problem is studiedby using Lagrange multiplier methods with piecewise constant elements. Optima
为了给油桃抗冷害技术的研究提供参考,本试验以油桃品种‘秦光2号’为试材,清水浸果为对照,研究冷藏条件下(0±0.5℃)外源腐胺(Put)在提高油桃果实耐冷性、降低贮藏冷害及延
In this paper, we investigate the finite element A - φ method to approximate the eddy current equations with discontinuous coefficients in general three-dimens
机械振动胁迫能促使茶鲜叶内含物质间相互转化,且能实现机械化连续操作,研究振动胁迫对茶鲜叶生理变化的影响规律对于机械化振动在茶叶生产中的应用具有实际意义。本试验在28℃,相对湿度76%的条件下,以不同强度的振动胁迫对福选九号和清心乌龙两个品种的茶鲜叶做振动处理,通过化学检测和感官审评相结合的方法,探究了振动胁迫对茶鲜叶理化变化及毛茶品质的影响,试验结果如下:1、振动胁迫加快了茶鲜叶水分的散失速率,且
We consider the numerical approximations of the complex amplitude in a coupled bay-river system in this work. One half-circumference is introduced as the artifi
1991年5月28日到6月2日《全国经济广播电台研讨会》在广州举行。这次研讨会主要是交流经验,同时也进行了一些理论探讨。内容相当丰富。对我们进一步研究广播改革的发展趋势将
In this study we will consider moving mesh methods for solving one-dimensional time dependent PDEs. The solution and mesh are obtained simultaneously by solving
We present a class of asymptotically optimal successive overrelaxation methods forsolving the large sparse system of linear equations. Numerical computations sh
本研究以‘美人指’葡萄(Vitis vinifera L‘Manicure Finger’)为材料,建立培养方法简单的不定芽再生体系,并在此基础上采用农杆菌介导法和花粉管通道法,将rolC基因导入‘美人