AMETHOD OF COMPREHENSIVE EVALUATION TO DEVELOPMENT PROJECT ALTERNATIVES     

Zheng Xiaoqing 《保鲜与加工》1995,(4):9-17

In view of the complication of compreliensive evaluation to development projectplanning alternatives,an AHP model for comprehensive evaluation to the alternatives is advanced,the way of determinating the weight of each index affecting the aIternatives' quality is expounded,and the general methods of evaluating the alternatives with the indexes are given.  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   

Non-invasive Measurement of the Brain Edema and Hematoma     

XU Zheng  HE Wei  WANG Quan-di 《保鲜与加工》2006,(7):29-32

A new method is introduced to measure the conductivity of brain. This method uses magnetic excitation to induce eddy currents inside the brain matter and measures the magnetic field caused by the induced eddy current. The theoretical basis of this method is analyzed and the measurement system is introduced. The aufhors do the experiment and draw a conclusion that the method provided is feasible.  相似文献   

Microstructures, Reaction Kinetics and Properties of Reaction Between Magnesium and Silica Glass          下载免费PDF全文

ZHOU Zheng  FENG yi 《保鲜与加工》2007,(1):61-64

In earlier calculation models,the stiffness centers in frame-shear wall structures have been located by the structural torsion stiffness.However,the results are illogical owing to the difference between the distortion character and the shears distribute mechanism of the frames and shear walls.In this paper,a new formula for calculating story stiffness is introduced,which can consider the stiffness of the frames and shear walls at the same time.The structural stiffness centers,the torsion eccentric distances and torsion effect are calculated,and the stiffness of elements is considered also.It is shown that the concept of the presented stiffness model is clear and the results are reasonable,which can be used to calculate the appreciative torsion effect.  相似文献   

DETERMINING H_3BO_3 IN THREE-VALENCE CHROMIUM-PLATING SOLUTION WITH BF_4~- ION-SELECTIVE ELECTRODE     

Zheng Huaili Department of Natural Science 《保鲜与加工》1992,(1)

  相似文献   

小麦花培材料的筛选和利用   总被引：2，自引：4，他引：2  

姜秀芳  郑继周  邓春霞  韩玉林  王凤真 《中国农学通报》2005,21(2):62-62

花培育种是一条快速有效的育种途径，采用两种培养基对20个小麦组合材料进行花培分析，结果表明：小麦花培愈伤组织诱导培养基K优于C17，绿苗产率是C17的3.5倍多。不同基因型材料花药培养差异较大，筛选出一批不同类型的高培养力基因型材料，为有目的组配杂交组合提供依据，提高花培育种效率。  相似文献   

土壤水分对稻米外观品质的影响     

吕艳东  李红宇  郭晓红  郑桂萍 《中国农学通报》2006,22(7):238-242

水稻的分蘖期、长穗期、抽穗后1～10d、11～20d、21～30d及1～30d,用负压式土壤湿度计监测,分别进行土壤水势为-30～-35kPa、-60～-65kPa的控水处理,收获后对优势粒、中位粒、劣势粒进行粒形和垩白测定,发现在不同土壤水分下S品种长穗期和抽穗后1～10d控水显著抑制了籽粒伸长,也不同程度的抑制了籽粒增宽和长厚,以S4处理受抑制的程度最为严重;Y品种主要是长穗期控水显著抑制了粒长、粒宽和粒厚;两品种的多数处理不同程度的提高了粒厚,这在优势粒中更明显;土壤水分对粒长/宽的影响很小。S品种各处理垩白率、垩白度多低于CK,Y品种各处理垩白率、垩白度多高于CK。对两个品种来说长穗期是影响外观品质的主要水分敏感期,节水栽培应从品种选择入手。  相似文献   

软包装调味笋的研制   总被引：2，自引：0，他引：2  

白卫东  赵文红  刘晓艳  黄靖妤 《农产品加工．学刊》2006,(1):40-42

对软包装调味笋加工的色泽和口感进行研究。研究表明,用质量分数为0.005%的NaH SO3溶液预处理原料,用质量分数为0.1%的CaCl2溶液预煮杀青10m in,并用0.15%的醋酸浸泡30m in,焖煮时间控制在5m in,就能较好地保持新鲜笋的色泽,同时兼顾产品较高脆性和较好的滋味,达到良好口感的需要。  相似文献   

鸡新城疫油佐剂灭活疫苗的研究   总被引：3，自引：2，他引：3  

郑世兰  姜北宇 《华北农学报》1995,10(3):115-123

采用ＮＤ Ｌａｓｏｔａ株为种毒，福尔马林为灭活剂，７号白油为佐剂，吐温８０、司本８０为乳化剂，硫柳汞为防腐剂，高压匀浆泵为乳化工具，研制出ＮＤ油佐剂灭活疫苗。其剂型为双相型（Ｗ／Ｏ／Ｗ），呈稀薄乳状液，粒度为１ｕｍ左右，粘度≤１ｓ，通针性好。４￣８℃有效保存期１年。效力≥７０ＰＤ５０，最早产生免疫时间为１２天（１００％保护），生产中常用免疫剂量为２月龄内每只０．５ｍｌ，２月龄以上每只１．０ｍｌ皮下  相似文献   

提高农业科技服务能力 推进农村小康社会建设   总被引：1，自引：0，他引：1  

郑南曙 《中国农学通报》2005,21(3):382-382

中国全面建设小康社会重点在农村，难点在如何增加农民收入，很大程度上取决于如何为八亿农民提供农业科技服务，促进农业技术创新和科技成果转化为现实生产力。本文从中国农业生产的现状、科技服务“缺位和滞后”和力量不足等问题入手，提出改革现行的农业科技运行和转化机制、开展科农携手共建利益共同体、发挥示范榜样作用、提高劳动者的科技素质等对策，促进科学研究面向生产第一线和科技成果直接应用于生产，为农民提供全方位、多层次、多领域的科技服务，推进农村全面建设小康社会进程。  相似文献