SOME PROPERTIES OF FEASIBLE DIRECTIONS

Some properties of feasible direction in the convx case are generalized to, the corresponding properties in generalized covex case and their applications for multiobjective mathematical programming are discussed in this paper.     

Harvesting machine for kelp culture in floating raft

Kelp is not only a kind of food of sea vegetable for human, but also widely used as raw materials in processing food, chemical engineering, pharmaceutical and cosmetic industries. In China kelp is generally planted on floating raft by using horizontal kelp rope cultivation method and often harvested manually. Harvesting kelp by hand is a difficult process with low production efficiency and high labor intensity. In this paper, a harvesting machine was developed for floating raft culture of kelp. It consists of mainly two locomotion modules, a collection/transmission module and a power module. The structure and working mechanism of this machine was presented and analyzed in detail. The tests of experiments were conducted as well with the developed machine. The manual harvest efficiency is 16.7%; however the mechanized harvest efficiency average value is 35.8%. The harvest time could be reduced by half if the company takes the same people to work. It is proven that the design of the machine is feasible.     

宣木瓜产业发展方向的研究——以清除自由基产品的综合开发为例

农产品加工处于农业产业价值链的下游,是深度挖掘潜在价值和附加价值的关键一环,在整个产业链条中具有重要地位.宣木瓜优良的保健作用是其深加工所依托的核心优势,结合社会及经济环境,分析了宣木瓜作为清除自由基产品开发的优势、劣势、机遇和挑战,对宣木瓜行业的前景进行了展望,以此对宣木瓜加工业未来发展的规划提供可靠的依据.     

大兴安岭微波通信工程可行性研究

本文介绍了大兴安岭微波通信工程的概况，对涉及到的具体的问题进行了可行性研究。     

玉米及其秸秆作为可再生能源利用模式的探讨

分析多年来人们对以玉米及其秸秆作为可再生能源的开发和利用,归纳出玉米及其秸秆作为再生能源利用模式。     

单边径向裂纹轴校直行程可行域计算及实验

依据弹塑性断裂理论和实验分析对含裂纹轴校直中最危险的单边径向裂纹轴进行了研究，提出了单边径向裂纹轴校直行程可行域计算方法，经实验验证是有效的。     

控释氮肥养分释放特征快速评价方法的研究

本文研究了不同室内模拟试验条件下控释氮肥的养分释放特征。结果表明,60℃水浸泡培养法所反映控释氮肥的养分释放特征与标准参比方法(25℃水浸泡法)一致,其中养分累积释放曲线都呈一元二次抛物线型;不同释放阶段的平均释放速率成极显著的直线相关关系,相关系数达0.98。60℃水浸泡培养法步骤简单,所需时间短,可作为快速评价包膜控释氮肥养分释放特征的方法。     

三元肥料效应模型的整合与优化建模策略

针对当前作物肥效模型建模成功率普遍偏低的问题,探讨了提高建模成功率的优化建模策略.在分析整合三元非结构肥效模型非线性最小二乘(NLS)和三元二次多项式肥效模型普通最小二乘(OLS)、主成分回归(PCR)和可行广义最小二乘回归(FGLS)四种建模法的适用性基础上,根据水稻和露地蔬菜的1122个氮磷钾田间肥效试验结果,探讨...