Optimization of Worm Gearing''s Geometric Parameters Under the Condition of the Errors and the Load     

XU Wu-jiao  QIN Da-tong  SHI Wan-kai ongqing  Chin 《保鲜与加工》2004,(4):24

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Vibration & Noise Analysis on Double-ring Gear Reducer   总被引：1，自引：0，他引：1  

XIE Yong-chun  WANG Li-hu  LIU Wen  LIU Jing-hao  Chongqing  Chin 《保鲜与加工》2004,(4):20-23

Double-ring gear reducer with Central inputting shaft is studied. The basic structure of reducer as well as testing equipment, probe spot and testing method of Structure-borne noise and air-borne noise is presented. Based on frequency spectrum of each point, amplitude spectrum of structure-borne noise and testing results of air-borne noise, the authors analyze the vibration characters and latent faults of double-ring gear reducer, coming to the value and the cause of the noise, providing theoretical basis for proper design of the double-ring gear reducer and method of reducing its vibration and noise.  相似文献   

Design and Application of a New Elliptical Crystal Spectrometer     

GAO Jie  ZHONG Xian-xin  XIAO Sha-li  XIONG Xian-caieMinistry of Education  Chongqing University  Chongqing  Chin 《保鲜与加工》2004,(5):5-8

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Study on DAQ System by Using LabVIEW     

YANG Zhong-ren  RAO Cheng  ZOU Jian  PENG Zhen-liane Ministry of Education  Chongqing  Chin 《保鲜与加工》2004,(2):32-35

Dong village is very valuable for research work because of its special regional and national character and rich cultural implication. In this paper, some information about the location, form and features of Dong village is given. Then, the relationship between the culture and the settlement is analyzed, which provides a clue for understanding Dong village and will be beneficial to creating modern human settlements.  相似文献   

Simulation of the penetration rate (ROP) of the air percussion drilling     

LIN Yuan-hu  LI Run-fang  SHI Tai-he  LIANG Zheng  LIN Teng-jiao Goods  SWPI  ngqing  Chin 《保鲜与加工》2004,(8):1-6

It is difficult to calculate the penetration rate (ROP) of percussion drilling. In the early research, the empirical or semiempirical formulae of the ROP are derived from the laboratory or field data collected by the researchers. However, the ROP value of the formulae is not as accurate as that in the field. Benefiting from the dynamic model, the geometric structure model and the theory of the roller cone bit, the mathematical model of the hammer bit, the mathematical model of the true bottom hole and the mathematical model between the tooth and the rock of the hammer bit are established. Hence the ROP of the air percussion drilling can be predicted by simulation. Field tests show the models are reliable and the results are coincident with that in the field. The research can help to redesign the hammer bit and optimize the drilling parameters.  相似文献   

黄土高原北部垄膜沟植田间集雨高效栽培技术研究   总被引：1，自引：0，他引：1  

DUAN Yu  TUO De-bao  ZHAO Pei-yi  LI Huan-chun Inner Mongolia Academy of Agricultural  Animal Husbandry Sciences  Huhhote  China 《华北农学报》2006,(Z3)

在黄土高原北部,采用起垄覆膜(垄上覆膜种植马铃薯,垄沟种植谷子)的垄沟间作田间集雨补灌栽培并结合增施氮、磷、钾化肥,具有显著的增产、增收效果。该技术可大大提高化肥的增产效果和肥料利用率,有明显的集雨增墒效果,同时采用起垄覆膜种植马铃薯与垄沟种植谷子能够合理利用有限的工程集雨,有利于充分利用有限的降水资源,进行节约化农业经营。  相似文献   

鄂尔多斯高原北部沙区主要植被类型下土壤要素的空间分析   总被引：1，自引：0，他引：1  

WANG Zhong  QIAO Hai-yan Eology Item Office of Yi-li Resource Group  DuguitaLa  China 《华北农学报》2006,(Z3)

鄂尔多斯北部沙区存在着极为显著的风沙地貌,在此格局基础之上,特别是在植被与土壤的相互响应过程中,二者的相互关系逐渐密切,这种反馈作用使得该区域的植被与土壤要素形成的空间分布格局具有一定的耦合性。研究这种关系可以为该地区保护植被和合理利用土地资源提供科学依据。  相似文献   

山西地膜棉花高产优质综合农艺措施数学模型的研究   总被引：5，自引：0，他引：5  

冯利平  韩学信 《棉花学报》1996,(5)

本文采用五因素五水平二次回归旋转设计的方法，研究了山西不同生态棉区皮棉产量与密度、氮、磷、钾施肥量及化控次数（用量）关系的数学模型。分析了不同因素的影响效应，明确了各栽培措施的主次。通过模拟进优待选了不同产量等级的优化农艺措施组合方案，为不同生态棉区制定棉花高产优质决策方案提供依据。  相似文献   

黔西县农村水电发展存在的问题和对策     

ZHENG Zhao-xiang  XIONG Yi-jie  LIU Qian-ling QianXi County Water Conservancy Bureau  QianXi  China 《华北农学报》2006,(Z3)

建国以来,黔西县小水电建设在省、地主管部门的关心支持和当地党委、政府的正确领导下,经过多年努力取得了一定成绩。但近年来由于种种原因,小水电建设未能继续向前发展,致使全县水能开发利用率极为低下。当前,农村小水电正面临着前所未有的大好发展机遇,分析全县农村小水电建设管理工作中存在的问题及其原因,研究相应的对策,对农村小水电的发展具有重要意义。  相似文献   

对两个玉米雄性不育系的细胞质分类研究   总被引：3，自引：0，他引：3  

李建生  徐尚忠 《作物学报》1993,19(2):156-164

本文从普通遗传学、植物病理学和分子生物学的水平对玉米雄花不育系—元徐cms—小黄和恩二激cms—大黄进行了综合性的分类研究。大田的育性反应表明，这两个不育系的育性恢复受一对显性基因控制。对花粉染色的观察发现F1可育花粉与败育花粉基本上呈1：1分离。用小斑病T小种接种，这两个不育系不表现专化感染。通过mtDNA的分析  相似文献