Regression Applied in Continuous Mathematical Forecast     

CAI Zhang-li  SHI Wei-ren  DIAO Ling 《保鲜与加工》2005,(10):91-93

Data Mining can distill the connotative, unknown and potential value information or pattern from many data. It is a problem that must be settled during the developing of Decision Support System how to discover knowledge from Data Warehouse. In order to realize the continuous mathematical forecast that will be used in the Marketing Decision Support System for Industrial Enterprise, the authors use the method of regression to discuss how to design the algorithm for Data Mining, how to design the model for Data Mining, and so on. When the algorithm applied to the sales forecast, the result processing to simulation data indicates it can realize the expected effect.  相似文献   

Study on Optimum Design of Rectangular Sedimentation Tanks     

CAI Jin-bang~  ZHU Liang~  DUAN Xiang-bao~ 《保鲜与加工》2005,(6):67-70

In this paper,the flow velocity fields,suspended solids concentration fields and flow-through curves in rectangular sedimentation tanks with different reaction baffles location,inlet horizontal velocity and length height ratio are simulated in detail using a developed mathematical model given in Reference 2.According to the numerical results,the influence of different reaction baffles location,inlet horizontal velocity and length height ratio on the operating efficiency is analyzed.Finally,the rational reaction baffles location,inlet horizontal velocity and length height ratio are presented.  相似文献   

Rectangular Cover System of Manifold Method and Its Auto Mesh Algorithm   总被引：2，自引：0，他引：2  

CAI Yong chang  ZHANG Xiang wei 《保鲜与加工》2001,(1):42-46

In contrast to the finite element method, another form of numerical method which is based on the using of rectangular math covers in manifold method is proposed. In this method, the element data is not a necessary in the input data files and it can be incorporated with the CAD technology conveniently. The theory and application of the method are discussed and the auto mesh algorithm of the cover system is also given in this paper. The numerical examples indicate that the method and the algorithm are accurate and effective.  相似文献   

Computer-aided Classification and Identification of Traditional Chinese Medicine Herbal Formula     

CAI Cong-zhong  YUAN Qian-fei  XlAO Han-guang  LIU Xing-hu  KONG Chun-yang 《保鲜与加工》2006,(10):42-46

  相似文献   

Study on Landscape Planning of Mourtcainous City     

CAI Yun-nan  GUO Hong-yu 《保鲜与加工》2000,(1):63-68

:In accordance with the problems, occurred in the mountainous city's construction, especially the crises such as the destruction of ecological and humanistic environment, the loss of traditional culture and characteristics and the disorder of urban structure, this paper discusses the distinctive landscape characteristic of mountainous city thoroughly.  相似文献   

内混式自吸离心泵自吸性能影响因素的试验研究     

仪修堂  兰才有  杨培岭  侯永胜  高战地  蔡振华 《灌溉排水学报》2007,26(5):14-17

针对比转速为74~112的5台内混式自吸离心泵,采用3种不同直径吸水管和6种不同隔舌间隙,对其规定高度自吸时间和极限真空度进行了较全面的试验研究,并对试验结果进行了综合分析。结果表明,对于内混式自吸离心泵,规定高度自吸时间总体上随吸水管内初始存气量的增加而成线性递增,而极限真空度与吸水管内的初始存气量无关;当隔舌间隙为1~6 mm时,隔舌间隙越小,自吸性能越好;泵的额定流量越大,自吸性能受隔舌间隙的影响越大。该研究对内混式自吸离心泵的水力设计、部分结构参数的确定以及自吸性能的进一步提高具有较重要的意义。  相似文献   

合理确立征地机制 保护农民切身利益     

李含光  蔡元军 《农机化研究》2005,(5):48-49

征地管理工作是一件关系国计民生的重要任务，也是一项系统工程。长期以来，我国在征用集体土地方而做了大量的工作。在此，对在保障社会经济发展的前提下，如何妥善安置失地农民，合理确定征地补偿安置倍数，切实保护农民的利益不受侵害。提出了建议和措施。  相似文献   

湖南省水稻种植环节的机械化选择     

蔡敬文  汤路生  江波 《湖南农机》2007,(11):1-3

目前湖南水稻生产机械化的发展势头喜人,但其种植环节的机械化发展较慢,水平还很低,成为水稻生产机械化最突出、最薄弱的环节,是提高水稻综合生产能力的重点和难点,也是各级农机管理、推广部门一直以来不断研究、探索、寻求解决的重要课题.为此,概述了湖南省水稻种植机械化发展历史,分析了当前抛秧、直播、插秧三种方式的利弊,因此区域水稻生产的特点,决定其在今后一段时间内,不论是哪种种植方式都不可能完全淘汰,想用其中任何一种方式包打天下,都是不现实的.但因水稻机械化插秧技术具有省工节本,减轻劳动强度;增产、增效;避病避虫;高产稳产的优势,从长远发展来看,机械化插秧代替人工将势在必行.  相似文献   

实际道路车辆排放因子的测试方法     

蔡晓林  杨延相  杜青  刘昌文  刘杰 《拖拉机与农用运输车》2006,33(1):11-13

设计了一种实际道路上的车辆排放因子的测试方法,将一套车载实测系统安装在一辆机动车上进行测试研究,可以获得大量的实际道路上的行驶参数和排放原始数据,根据实测的汽车的瞬时车速、油耗以及各排放气体浓度值(HC,CO,NO,O2,CO2),可以计算得到各组分的质量排放率和排放因子。并通过这种测试方法,获得了试验用公交汽车的实际道路排放因子。  相似文献   

基于WS和实际耗水量的膜下滴灌     

张振华  蔡焕杰  杨润亚 《中国农村水利水电》2005,(3):4-6

通过田间试验，建立了膜下滴灌棉花CWSI和水汽饱和差VPD的定量关系，确定了棉花各生育阶段CWSI下基线的特定表达形式。对膜下滴灌条件下棉花生长发育、光合动态与根系分布规律以及不同水分处理的耗水量、产量与品质指标进行了观测。对不同水分处理棉花的CWSI进行了定期观测，得到了棉花CWSI与棉花耗水量的关系。  相似文献