黑龙江省水稻单产增长潜力预测方法研究   总被引：1，自引：0，他引：1  

孙敬义  卢铁光  徐建中  赵洪波 《农机化研究》2005,(1):131-133

水稻是黑龙江省的主要粮食作物。加入WTO后,水稻生产、贸易、进出口等方面都面临新的形势,同时水稻产量的稳定和增长对于国家粮食安全、人民生活水平提高以及农民奔小康都有着重要意义。因此,探讨了应用Peal曲线函数模型对黑龙江省水稻单产进行预测的方法。  相似文献   

秸秆袋装微贮饲料加工机械的研究   总被引：2，自引：0，他引：2  

张本源 《农产品加工．学刊》2005,(2):67-68

秸秆袋装微贮饲料是一种营养价值高、采食和吸收率高、便于贮存和中长距离运输的饲料,是秸秆产业化的一项新技术。研究了商品化秸秆袋装微贮饲料加工机械,并提出了相应的饲料生产工艺。  相似文献   

AN APPRONTMATE CALCULATING METHOD FOR WALL PLATES OF MAN'' S DRY GAS HOLDERS     

You lihua Wu Huibi Sun Renbo Wang Daivu 《保鲜与加工》1992,(4):48-53

The basic equations of wall plates of MAN' S dry gas holders are derived in this paper. According to the law of cylindrical bending given by the finite element results .we derive some approximate formula calculating the deflection and stresses of the wall plates from the basic equations. Compared with the known approximate calculating method.the method car. obviously increase the percision.  相似文献   

Visualization of the FEM Analysis Data of 3D on the Cut Plane     

YUAN Zheng-qiang  ZHANG Zhi-guang  YANG You-fa 《保鲜与加工》2005,(9):102-104

The colored patterns on arbitrary cut plane is an important method in 3D data-field visualization of finite element.By using the technology of the Object-Oriented Programming and the method of scan-line,the colored patterns on arbitrary cut plane are given.The example by the OPENGL of Visual C++ R6 can support the theory satisfactorily.  相似文献   

New Algorithms for Data Discretization Based on Rough Set Theory     

ZHAO Jun  WANG Guo_yin  WU Zhong_fu  LI Hua 《保鲜与加工》2002,(3):18-21

The discretization of real values is always one of the key problems to be solved in the domain of machine learning for its great contribution to speeding up the followed learning algorithms, cutting down the real demand of algorithms on running space and time, and improving the clustering capability of the ultimate learning results. The basic characteristics and framework of discretization approaches based on rough set model are analyzed at first, then the different measurements of the importance of candidate cuts are discussed and researched. Two new heuristic algorithms are put forward to finally select the useful cuts from a candidate set. The selected cuts of the two algorithms will adequately maintain the discernible relation of information systems for their full considering the specialty of rough set, which perfectly embodies the advantages of this theory. Moreover, excellent discretization results may be expected through these heuristic algorithms.  相似文献   

我国谷物干燥机械的发展现状及对策   总被引：7，自引：0，他引：7  

李军富 《农机化研究》2006,(9):44-46

谷物干燥是粮食生产的重要步骤。我国是粮食生产和消费大国,因地制宜,大力发展谷物干燥机械,对于解决粮食生产过程中的损失和提高谷物品质有着极其重要的意义。为此,针对我国谷物干燥机械发展过程中存在的问题,提出了对策及建议,为我国谷物干燥机械的发展研究提供了参考依据。  相似文献   

Quality and maximum profit of industrial tomato as affected by distribution uniformity of drip irrigation system     

Francisco L. Santos 《Irrigation and Drainage Systems》1996,10(3):281-294

The tomato industry reformed its system of payment by weight of tomato, introducing a corrective system based on percent level of fruit dry matter produced. Such a decision implies significant changes in the management of irrigation systems, with a need to emphasize the technological quality of the marketable product. Three levels of distribution uniformity of the irrigation system are analysed, and related production functions of crop yield and percent of dry matter are presented as well as their use on the optimisation of dry matter, expected revenues and seasonal applied water. Results are critically influenced by the distribution uniformity. They demonstrate the inter-relationship between crop production, percent fruit dry matter and irrigation management, and the importance of considering non-uniformity in the economic analysis of industrial tomato production. Decreases in uniformity lead to a reduction in dry matter production per unit land. Decreases in dry matter are also observed with increasing levels of seasonally applied water, with the optimal level always lower than the required for maximum yield. Such interaction suggests a continuous and inverse relationship between profit and water applied. However, due to the corrective system of payment, by levels of percent of dry matter produced, for some uniformity, the expected revenue follows the yield-water production function instead of the dry matter function. This fact introduces disturbances in the optimal water applied inducing higher than expected levels of water applied for profit maximisation. The simulated data also show that incentives to switch to new systems or management practices able to raise the distribution uniformity result more from profit losses than increases in water price.  相似文献   

干旱缺水灌区节水灌溉评价标准及其分析     

姚崇仁 《中国农村水利水电》1995,(6)

在分析节水灌溉定义内涵的基础上，提出了评价干旱缺水灌区农田节水灌溉的目标标准和技术标准，并对这些评价标准的运用进行了讨论。  相似文献   

水稻旱作覆膜节水增产试验研究     

吴珠明  时光宇  鲍炳钧 《中国农村水利水电》2001,(2):22-23

通过水稻旱作全程覆膜与半程覆膜、旱作不覆膜及水栽对比试验，研究其耗水规律，计算其节水量与增产量，并进行经济效益分析，提出了适合本地区的栽培模式。  相似文献   

加工专用型花生品种适宜栽培因子及加工属性研究简报   总被引：1，自引：1，他引：0  

苏秋芹  卢春生  郭其茂  陈永水  陈剑洪 《花生学报》2006,35(3):19-23

采用正交试验设计方法进行了品种(A)、穴粒数(B)及种植密度(C)三因素正交试验,同时进行品种加工属性研究。结果表明,品种和穴粒数的极差R′较大,其次是种植密度。泉花538的加工成品率和一级品率分别比对照高4.4和9.7个百分点,泉花627的加工成品率和一级品率分别比对照高5.3和9.3个百分点,这两个品种的产量分居第一、二位,而且加工属性较佳,适宜加工咸酥花生。另外还就各因素对产量影响以及最优处理组合进行了分析。  相似文献