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   

Loads Equalization Based on Optimization Principle and the Hierarchical Model for Distribution Networks     

LIN Jing dong  CAO Chang xiu  ZHANG Bang li 《保鲜与加工》2002,(5):29-32

Loss reduction is important for distribution networks and it is available to reduce loss by loads equalization. With increasing numbers of vertexes in distribution networks, compounding of loads are rapid increasing. It is hard to achieve the global optimization for load balancing by traditional model of distribution networks. Base on analyzing character of loads equalization for distribution networks, this paper provides a new method which conjugate the optimization principle and the hierarchical model of the distribution networks, can transfer the optimization issues into multi stage decision making problems,and can also achieve the optimization equalization of the distribution networks loads.  相似文献   

Study and Practice of Safety Grade Assessment for Large Convention and Exhibition Centre     

ZHOU Tie-jun  LIN Ling 《保鲜与加工》2007,(3):12

This paper takes "how to estimate the complex security of Large Convention and Exhibition Centre effectively" as the research goal.Based on analyzing the difficulties,target system,technical constitution,probing into the architecture,safety science,and using for reference the mathematics,operational research,statistics and modern system theory and method,trying to explore establishing an evaluation methodological system,which is provided with integrated characters on subject.Based on these ways,it exerts "quality to quantity" fuzzy analytical hierarchy process(FAHP) and aims at discussing the safety grade assessment of the Chongqing International Conference Exhibition Center focusing on designing theories.The aim is to enhance the integration of design practice and safe consciousness,strengthen the building safety management,and perfect city public security system.In practice,it is also an efficient tool for favoring values of architectural environmental safety.  相似文献   

Voltage Fluctuation and Flicker Mitigation Using STATCOM     

LIU Fang-lan  LIN Li  MU Dao-huai 《保鲜与加工》2007,(2):34-36

Voltage fluctuation and flicker is one of the main causation that imperils reliability of power supply. Steelmaking EAF with large load of distribution network produces large impact and interference on the public electric network in operation. So it is very important to control reactive power for voltage fluctuation and flicker mitigation. STATCOM possessing high response speed is an effective measure to mitigate voltage fluctuation and flicker of distribution network. Here, comparing to static var compensation, many advantages of STATCOM are analyzed. Operation principles COM mitigating voltage fluctuation and flicker, general control strategies and control method are introduced cussed. The researching pivot and trend in the future are also discussed. of STAT- and discussed. The researching pivot and trend in the future are also discussed.  相似文献   

Converse Illation Method on Optimal Control of Reheating Furnace     

DUAN Ying  LIN Tao  DUAN Wen-ze 《保鲜与加工》2007,(8):21-25

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浅谈种业界知识产权的过度保护     

林勇 《种子世界》2006,(10):13-14

知识产权在种业界一般表现为植物新品种权。《中华人民共和国植物新品种保护条例》（以下简称《植物新品种保护条例》）第六条规定：“完成育种的单位或者个人对其授权品种，享有排他的独占权。任何单位或者个人未经品种权所有人许可，不得为商业目的生产或者销售该授权品种的繁殖材料，不得为商业目的将该授权品种的繁殖材料重复使用于生产另一品种的繁殖材料”。这一规定是品种权人权利的核心。  相似文献   

农田土壤含水率与坚实度快速信息采集系统   总被引：1，自引：0，他引：1  

邵玲  林剑辉  孙宇瑞 《农机化研究》2007,(2):83-86

介绍了一种农田土壤含水率与坚实度快速信息采集系统.本系统包括土壤介电传感器、圆锥指数传感器及深度传感器,可以快速、同步、实时地获得0～500mm范围内土壤剖面含水率与圆锥指数信息.同时,本系统还结合了GPS和GIS技术,实现了土壤参数的空间分析,可以更方便地把系统应用于农田信息管理.本系统为实现土壤水分和坚实度的同步测量搭建了一个智能化的试验平台,并且在与德国波恩大学农业工程研究所的合作中成功地应用于田间测量.  相似文献   

鸽粪中温发酵产沼气潜力的实验研究     

吉喜燕  林卫东  张无敌  尹芳  刘士清  王昌梅  赵兴玲  柳静  杨红 《中国沼气》2015,(3):51-55

文章将鸽粪作为发酵原料,在30℃±0.2℃恒温槽水浴条件下,以全混合批量式发酵的方法产沼气。实验结果表明,鸽粪是较为良好的发酵原料,其TS产气率和VS产气率分别为486 m L·g-1和631 m L·g-1。与其他原料相比,分别是鸡粪的1.56倍,兔粪的1.08倍,猪粪的1.15倍。运用一级动力学的相关原理和修正后的Gompertz方程进行计算机拟合,分析了整个鸽粪厌氧消化周期中的产沼气规律。  相似文献   

先进安全车(ASV)技术的现状与发展     

朱余清  洪添胜  李钳金  林飞振  林彩霞 《农机化研究》2006,(4):54-56

先进安全车(ASV,AdvancedSafetyVehicle)是为21世纪开发使用的一种高度智能化的安全车,其主要利用电子技术进一步提高汽车的安全性能。因而,汽车安全性的研究与开发已成为汽车行业发展的主要方向。为此,介绍了先进安全车(ASV)技术的现状,并讨论了这项技术的发展趋势。  相似文献   

两种有效的预测方法理论分析及实践     

王维新  林燕燕 《农机化研究》2006,(4):86-87

预算实际上是一种建模,即根据过去和现在已有的信息建立一个从过去引伸到未来的模型。而时序分析法和灰色系统理论是两种有效的预测方法。为此,介绍了这两种预测方法的原理,并预测了新疆兵团的农机情况。其结果表明:未来10年,新疆农机总动力和投入将会有较大幅度的增长,而农业机械化程度将趋于最高值。  相似文献