Minimum Error Variance Adaptive Controlling Technique Applied on the Auto Regulation System of the Draw Frames     

CHEN Rui chuan  CHEN Guo cong 《保鲜与加工》2003,(3):122-125

Firstly, the uncertain factors in drawing process, which cause the changes of the sensor's displacement and the sensor's vibration, are analyzed in terms of mechanics and statistics. Systemic randomictiy and non linearity affect the performance of traditional auto regulation equipment. Using the minimum error variance adaptive controlling technique to solve the uncertainty of controlled system is the ideal method. Secondly, using generalized least square method to achieve the principle and method of the system identifying model is described. Thirdly, the design steps of the minimum error variance adaptive adjustor and the method of the computer simulation are discussed. The result of test running shows that the output of the system follows the input of the system better, the system restrains the random disturbance more efficiently, and the performance of auto regulation is improved apparently.  相似文献   

杀虫杀螨剂对草菇菌丝生长的影响   总被引：2，自引：0，他引：2  

郭丽琼  林俊芳 《食用菌学报》1997,4(4):49-55

采用修正的琼脂玻皿法研究了四种杀虫杀螨剂对草菇菌丝生长的影响.结果表明,不同药剂对草菇菌丝生长的影响程度存在着显著差异.其中敌敌畏对草菇菌丝生长的影响最大,其平均抑制率为-65.55%;中西溴氟菊酯影响最小,平均抑制率为-11.40%,且在25.00×10~(-6)和20.00×10~(-6)的低浓度下对草菇菌丝的生长还有促进作用,促进率分别为 11.25%和 17.75%;灭螨灵和氯氰菊酯的平均抑制率分别为-29.20%和-29.60%.药剂的浓度与草菇菌丝的生长率成显著或极显著的负相关,即草菇菌丝的生长率随药剂处理浓度的增大而降低.本研究结果还表明,药剂对草菇菌丝生长的影响不仅表现在生长率上,还表现在草菇菌丝密度、分枝次数、厚垣孢子数量及菌丝色泽上.  相似文献   

水稻种子消毒剂三·福混剂的特性及药效试验     

韩润亭  刘洪涛 《吉林农业科学》1997,(3):66-68

三·福混剂（901）是防治水稻恶苗病的种子消毒剂。产品剂型稳定，毒性低，田间示范防治效果高于生产上推广的其它药剂。成本低，使用方便。  相似文献   

乙氧氟草醚、乙草胺和盖草能在苗圃中的应用   总被引：1，自引：0，他引：1  

李建荣 《浙江林学院学报》2003,20(4):434-437

为了探讨乙氧氟草醚、乙草胺和盖草能在森林苗圃中的应用效果,进行马尾松Pinusmassoniana、火力楠Micheliamacclurei和乳源木莲Manglietiayuyuanensis苗圃化学除草正交试验。试验结果表明,乙氧氟草醚和乙草胺在苗圃播种后芽前期使用和苗期使用乙氧氟草醚、乙草胺和盖草能除草率达90%以上,持效期45～63d,同时对种子发芽出苗和苗木生长安全。采用20%乙氧氟草醚、90%乙草胺和10 8%盖草能,使用剂量为0 105mL·m-2进行化学除草,比人工除草减少除草用工59 1%～66 7%,降低除草成本46 8%～62 9%。表3参4  相似文献   

浅谈危险化学品运输安全监控   总被引：1，自引：0，他引：1  

施关春 《中国农机化》2006,(5):14-16

针对危险化学品运输安全中的突出问题,分析阐明危险化学品运输安全监控措施及法律责任,以确保生命财产安全。  相似文献   

鸽新城疫病毒QL株—些理化及培养特性     

诸敏  陈昌海 《中国兽药杂志》2001,35(5):9-10

本试验对鸽新城疫病毒QL株在鸡胚中的培养特性、血凝素热稳定性及对甲醛溶液、胰蛋白酶等理化因素的影响进行了测定，结果为QL株接种鸡胚后96h生长达高峰，QL株可耐受56℃40min,0.1%甲醛溶液能完全灭活QL株尿囊液，且仍保持较好的抗原性，0.5%胰蛋白酶37℃消化30min后，血凝性升高。试验结果为合理利用QL株生产鸽新城疫疫苗提供了实验依据。  相似文献   

重庆上市公司互保圈现象的会计思考     

陈凌雪  彭珏李燕 《四川畜牧兽医学院学报》2006,4(2):109-111

在市场经济环境下，贷款担保作为上市公司融通资金的一种方式，是企业的一种正常的经营行为。它可以减少交易风险、促进资本市场发展。然而，目前由于种种原因，上市公司互保不仅没有起到化解市场风险的作用，反而加大了证券市场和金融市场的风险，严重扰乱了资本市场的正常运行。因此，本文拟通过思考重庆“互保圈”现象，分析“互保圈”形成的原因及危害，并由此提出相应的对策与建议。  相似文献   

海漆正丁醇萃取物化学成分的气相色谱/质谱法分析     

刘文波秦春秀  刘业平袁宏球 《热带作物学报》2008,28(6):43-45

  相似文献   

Erhaltung der Ertragsfähigkeit des Bodens auf lange Sicht unter dem Einfluß von Fruchtfolgegestaltung, Düngung und Herbizideinsatz     

W. G. Sturny    P. Weisskopf    E. R. Keller  F. Schwendimann 《Journal of Agronomy and Crop Science》1989,162(4):268-282

Impact of crop rotation, fertilizer treatments and herbicidal applications on the long term maintenance of soil fertility
V. Comparative studies regarding chemical and physical factors of the yield potential of a soil over a ten year experimental period
In order to examine the influence of different crop management practices such as crop rotation, fertilizer treatments and herbicide applications on the yield potential of a soil, the Crop Science Department of the Swiss Federal Institute of Technology (ETH Zurich) conducted a long term field experiment commencing 1973. The experimental location was at the Swiss Federal Research Station for Farm Management and Agricultural Engeneering at Tanikon/TG (northeastern Switzerland).
After the ten year period, chemical and physical soil properties were not found to be substantially affected by the various experimental treatments. Organic carbon and total nitrogen were more influenced by fertilizer treatments than by crop rotation and herbicide applications. Both cation exchange capacity and pH proved to be fairly stable values.
Aggregate stability and organic matter exhibited similar profiles, although soil bulk density was affected by crop rotation. The volume of large and medium sized pores was similarly affected in that the corn-dominated crop rotation resulted in a quantifiable impact upon soil compaction.
Depending upon weed control efficiency, the grain yields of the winter wheat test crop clearly exhibited the effects of crop rotation whereas the lowest yields resulted from the corn-dominated crop rotation.  相似文献   

DMF—DMSO混合溶剂中多硫离子化学平衡的研究     

谢乃贤  黄义祥 《湖南农业大学学报(自然科学版)》1994,21(2)

采用分光光度法研究在二甲基甲酰胺（ＤＭＦ）和二甲亚砜（ＤＭＳＯ）混合溶剂中的多硫离子平衡表明，无论在Ｚ＝２或８／３的溶液中，当表现浓度减小时，都有利于多硫离子的降解。并且溶液中多硫离子之间的化学平衡，都随混合溶剂的组成变化，也即和介电常数有关．低介电常数有利于低聚合度的多硫自由基离子的存在．  相似文献