再生稻与同期抽穗主季稻源库流特性差异研究

以6个水稻品种(组合)为材料,研究了再生稻与同期抽穗主季稻源库流特性的差异。结果表明,再生稻叶面积指数为主季稻的1/8~1/5,穗粒数和产量为主季稻的1/3左右,但齐穗至齐穗后10 d再生稻光合速率较主季稻高20%~70%,孕穗至成熟期再生稻净同化率是主季稻的2.7~6倍;再生稻与主季稻枝梗过氧化氢酶活性差异不大,再生稻剑叶光合产物分配到穗部的比例明显高于主季稻,而残留在茎鞘中的比例大大降低;再生稻外观品质优于早稻与晚稻,而加工品质介于早稻与晚稻之间。本试验条件下,主季稻属增库增产型,而再生稻属源库互作型。为使再生稻高产,应选用穗粒数较多的品种,充分发挥再生稻光合速率与净同化率高的优势,采取积极的栽培措施,促进再生稻叶面积的扩展、穗粒数的提高与物质运转能力的增强。     

Application of a FDTD/MOMTD Hybrid Method to the Scattering Problem of the Ground Penetrating Radar

In order to analyze and research the scattering problem of the ground penetrating radar under the ground, a hybrid method combining FDTD and MOMTD is constructed to solve the problem. The curve of current on central feeding point of pick-up antenna is obtained by simulating when different distance between the ideal conductor and the ground is considered, correctness of the result gained by employing the hybrid method is proved through qualitative and quantitative analysis.     

Bilevel Programming Model and Solution Algorithm for the Supplier Selection in Automobile Components

Focusing on the characteristics of automobile components industry, such as long-term supplier selection, large number of suppliers, various assessment index, complicated processes, and extremely strict assessment requirements, an improved supplier selection bilevel programming model for automobile components industry is established. With this model, the authors analyzed selected objectives from viewpoints of both suppliers and purchasers, assessed several selectied factors with upper and lower layer objective functions, and produced a optimal supplier selection method to achieve minimum purchasing costs. This model takes several constraints, such as technology, quality, quoted price, supply capacity and services of suppliers, into consideration, which makes the model very practical. A genetic-algorithms-based calculation method is designed, and the model is validated through a case study. Both the model and the method provide valuable support to supplier selection in the automobile components industry.     

棉花半配生殖品系vSg诱导单倍体的早期鉴定

海岛棉半配生殖品系 v Sg( virescentlymarked semigamy line)能够高频率产生单倍体。利用 v Sg作母本可以有效地诱导产生单倍体。而在 v Sg与目标组合的杂交后代群体植株的发育早期快速、准确地鉴定出单倍体植株个体还存在一定的困难。本文提出了一种利用叶表皮单位面积中的气孔数目和分子标记相结合的早期、快速鉴定 v Sg诱导出的单倍体的方法     

无资料地区径流分析计算方法研究

应用区域回归法进行无资料地区径流计算。采用快速聚类划分水文一致区，建立径流量与特征变量的区域回归方程，应用加权最小二乘法估算回归系数，推求年平均径流及不同保证率下的径流量；通过模糊优选法选择相似流域，采用水文比拟法估算径流的年内分配。结果表明所提方法要优于传统的等值线图法。     

延边地区保护地辣椒水肥管理体系的探讨

通过因子分析获得综合指标值,进行模型拟合和优化,提出了延边地区保护地辣椒高产、优质、高效、节水、环保水肥管理体系.当灌水138.9~149.8 m3/(hm2·次),施纯氮248.3~278.2 kg/hm2,施纯磷140.8～159.7kg/hm2时兼顾了多项指标要求,实现了保护地辣椒合理施肥和灌水.     

四明湖干渠泵站自动化设计

基于灌区管理现代化、节水节能、节省运行费用、体现人文关怀理念的需要，本文以一个设计实例。介绍了中小型泵站自动控制系统的组成及特点。     

面向果林的一款农用喷雾机器人的创新设计

农业机器人是21世纪农业机械的发展趋势之一。为此,重点论述了一款面向果林喷雾作业的农用喷雾机器人的创新设计。同时,给出了具体的设计方案和总体装配图、车架结构图、传动系统图、转向系统图、升降机构图以及各部分参数。该款农业喷雾机器人提高了农业果林喷雾作业的效率,实现作业的自动化,大大降低了劳动强度,另一方面也避免了喷雾作业对劳动者的健康影响。     

影响切碎棉秆压缩成型过程的探讨

我国农林业加工残余物资源极为丰富,每年产出的农作物秸秆总量约为7亿t以上,除一小部分用于副业原料、肥料和饲料外,大量的秸秆以低效、低功能燃烧方式作为炊事燃料,或没有充分利用而被丢弃在田间焚烧,既危害农业及农村生态环境,又浪费可再生能源资源。将棉秆等生物质废弃物,切碎后用机械加压的方法压缩成具有一定形状、密度较大的固体成型燃料,是农林废弃物能源化利用的一种有效途径。为此,通过对切碎棉秆成型块的物理特性等方面进行分析,探讨了各因素对压缩成型过程的影响。