农机化与农业结构调整的适应性研究     

江波 《现代农业装备》2006,(1):46-51

本文阐述了农机化与农业结构调整适应性的内涵、特征与影响因素,并在分析过去与现在农机化与农业结构调整适应性问题的基础上,提出了今后农机化发展的适应性战略构思  相似文献   

神经网络模糊PID算法在温室温度控制中的仿真研究   总被引：2，自引：2，他引：2  

刘东利  王延耀  张建勇 《农机化研究》2006,(10):70-72

为了更好地实现对温室温度的控制,提出了温室温度控制的一种新的控制方法;通过仿真比较证明了此方法的有效性,并对其动静态特性、鲁棒性和抗干扰能力进行了探讨。结果表明,采用神经网络模糊PID算法的温室温度控制方法具有较好的动静态特性、鲁棒性和抗干扰能力。  相似文献   

流体食品微波杀菌工艺试验研究     

石少卿  李紫辉  董欣 《农机化研究》2007,(6):114-116,119

与传统的红外线杀菌、巴氏杀菌相比,微波杀菌具有能量损耗小、加热迅速且直接的特点,用于食品杀菌可以达到保持营养与风味、卫生、安全及无污染的效果.以往对食品微波杀菌的研究多集中于固体或半固体食品,而对鲜奶等液态食品的连续流动杀菌的研究较少.为此,通过设计的流体食品微波杀菌试验装置,以水为试验介质,以微波功率为试验参数,以杀菌过程中的温升和流量为试验指标,得到微波杀菌参数之间的相互影响规律以及在给定流量下微波功率的大致变化范围,为液态食品连续流动杀菌设备的进一步开发研究提供了一定的理论依据.  相似文献   

基于计算机视觉系统的溶液浓度快速检测方法     

赵海燕  贾贵儒  侯彩云 《农机化研究》2006,(12):136-138

基于计算机视觉系统的RGB色度学理论,提出一种测定有色溶液浓度的数字色度法,并开发了与之配套的软件检测系统。该方法与分光光度计相比,大大提高了检测效率,理论上每分钟可完成上百个样品浓度的同时测定。通过软件系统分析样品色度信息,实现自动显示被测溶液浓度的良好效果,为一次性成批检测溶液浓度提供了一种简捷快速的新思路。  相似文献   

New work study methods help to decide processing technique in logging     

《Scandinavian Journal of Forest Research》2012,27(1-4):569-574

The great variation in technical properties between and within trees indicate that the efficiency of logging would be enhanced if the processing technique is adapted to the varying quality of different trees and stem sections. To evaluate the suggested differentiation in processing technique, time studies must be performed that define exact time consumption for short stem sections. This paper exemplifies how videogrammetry and computer aided recording and processing of data can be used for detailed time studies. Recordings made in the field were later run for actual time studies indoors, using a digital watch recorded on the tape. The trees cut for the study were measured in detail, as well as the resulting logs. By registering detailed tree data, an important source of variation could be controlled and sample size kept reasonably low. The method proved to function well, especially for determining very short work elements.  相似文献   

提高黔东南生态文明建设实验区生态效率的对策研究——基于生态足迹模型法     

杨廷锋 《宁夏农林科技》2012,53(4):46-48

利用生态足迹方法计算分析了黔东南生态文明实验区生态环境消耗的类型和生态效率状况,结果显示其生态效率低,并且指出：生态效率低的原因是落后的经济及区域经济增长对生态环境资源消耗大。并在此基础上提出了提高生态效率对策。  相似文献   

植物病毒及脱毒研究之进展     

刘娜 《北京农业》2012,(21):80-81

植物病毒是一个极小的微粒.近几十年来,有关植物病毒的研究已取得很大的进展,对某些作物病毒的症状、寄生范围、传播途径、病理现象、鉴定方法及无毒苗培育途径等均已进行了深入的研究.  相似文献   

Accumulation and Mobility of Salts in Soil as Influenced by Primary Biomethanated Spentwash     

《Communications in Soil Science and Plant Analysis》2012,43(22):2947-2963

A soil column laboratory experiment was carried out at the central campus, Mahatma Phule Agricultural University, Rahuri, India during 2008–2009 to study the accumulation and mobility of salts in Typic Haplusterts as influenced by primary biomethanated spentwash (PBSW). The PBSW was applied in three different levels (0.5, 1.0, and 2.5 cm) and then tap water with low salinity and low sodium hazard (C₁S₁ class) was used to carry out leaching in four different levels of water at the pore volume of soil (WPVS) (0.5, 1.0, 1.5, and 2.0). The electrical conductivity (EC) in the soil increased significantly with increasing levels of PBSW and decreased with increasing levels of WPVS in surface (0–15 cm deep) and subsurface (15–30 cm deep) soil layers. The exchangeable calcium (Ca²⁺), magnesium (Mg²⁺), and potassium (K⁺) increased, whereas exchangeable sodium (Na⁺) decreased with increasing levels of PBSW and WPVS in surface and subsurface layers of soil. The organic carbon content increased with increasing levels of PBSW and decreased with increasing levels of WPVS in both the soil layers. The cation exchange capacity (CEC) increased with increasing levels of PBSW and WPVS in both the soil layers. The exchangeable sodium percentage (ESP) decreased with increasing levels of PBSW and WPVS over the initial values of soil in both the layers. The pH of saturated paste (pHs) was reduced and electrical conductivity of extract (ECe) was increased with increasing levels of PBSW and WPVS in both the layers. The Na⁺ content of saturation paste extract increased significantly with increasing levels of PBSW and WPVS in both the soil layers.  相似文献   

基于开源J2EE框架的高校实验教学管理系统研究     

魏霖静  岳建斌 《农业网络信息》2010,(3):111-113

依据高等院校实验教学管理的应用需求,在分析开源框架体系结构的基础上,通过整合Struts、Spring和Hibernate,利用分层解耦、框架管理层次的思想构建了一个基于开源J2EE的应用架构,并据此架构开发了高校实验教学管理系统。系统可靠性高,安全性好,可扩展性和可维护性强,能有效提高高校实验教学管理和服务效率。  相似文献   

关于大豆肥料效应田间试验报告   总被引：1，自引：0，他引：1  

童金晖 《北京农业》2012,(6):129+131

大豆肥料效应田间试验。共布置田间试验4个点,2010年秋实际收获3个点,3个点均通过了显著性检验,表明处理间差异显著。  相似文献