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Abstract1 The mineral resources of Chai damu basin is quite abundant, but due to that it has been in vulgar management, the efficiency of exploiting and comprehensive reciprocation from resources are low.
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摘要柴达木盆地矿产资源丰富，但开发利用效率低，基本上是粗放式经营，资源综合回收率低。 |
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Abstract: 1-(4-Pyridinyl)-2-propanone,which is the key intermediate of synthesizing the milrinone ,a cardiotonic agent,was synthesized from 4-methyl-pyridine by acetylation in dichloromethane and phase transition catalyzing hydrolysis.The overall yield wa
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文摘:报道了以4-甲基吡啶为原料，经酰化和相转移催化水解反应制备强心药物米利酮关键中间体1-(4-吡啶基)-2-丙酮的新合成方法，总收率达73.1%. |
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Abstract: 2 - Chloro - 5 - chloromethylpyridine is an importantintermediates of the pesticide and the pharmacology.
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文摘:2－氯－5－氯甲基吡啶是农药和医药的重要中间体。 |
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Abstract: 50 cases of elderly patients with esophageal cancer complicated with postoperatire anastomotic stricture were managed by ballon dilator. 41 cases were follower up for half to 3 years.
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文摘:目的进一步探讨治疗老年人食管癌术后吻合口狭窄的方法。 |
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Abstract: 96 varieties of persimmon (excellent individuals) have been introduced since 1990.The experiments indicated that the varieties such as Japanese Pinghewu, Shandong Red,Boai August Yellow showed better adaptability and economic speciality,which ma
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文摘:从1990年开始先后引种柿子96个品种(优株)，试验表明，日本平核无、山东红柿、博爱八月黄等品种表现了良好的适应性和优良的经济性状，可以在丽水地区和临近区域推广。 |
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Abstract: A 13-year-old male farmer suffered from cutaneous and na il phaeohyphomycosis for five years is reported in this paper.
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文摘:报告一例由球毛壳菌所致的皮肤和甲暗色丝孢霉病。 |
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Abstract: A 2-1evel control system composed of process control level and control management level is introduced.
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文摘:介绍一种由过程控制级和控制管理级组成的分级控制系统。 |
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Abstract: A CAD tool based on a group of efficient algorithms to verify,design,and optimize power/ground networks for standard cell model is presented.Nonlinear programming techniques,branch and bound algorithms and incomplete Cholesky decomposition conju
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文摘:介绍了一个基于标准单元布图模式的电源线/地线网络的辅助设计集成工具.它应用了一系列高效的算法,为用户提供了电源线/地线网络的设计、优化和验证的功能.非线性优化技术、分枝定界算法和不完全乔莱斯基分解的预优共轭梯度法是该工作的三个主体部分.用户可以选择使用非线性规划的方法或者几种分枝定界方法来满足他们对于精度和速度方面的不同需求.实验结果表明,文中所提供的算法可以在很快的运行速度下实现更低的布线资源占用.因此,在这些有效算法基础上实现的辅助设计工具具有处理大规模电路的能力. |
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Abstract: A PDM framework with an open structure and strong scalability for data organization is presented.The data expression paradigm with a distributed,multi-tier C/S system configuration and an object oriented STEP based data model together with exten
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文摘:产品数据管理系统的可扩展性和开放性是系统设计要考虑和解决的重要问题之一.在分析产品数据管理的需求基础上，参考STEP标准中对产品数据模型的描述和面向对象的建模方法，定义对象并建立基于对象的数据组织和管理机制，从而使系统具有一定的通用性、可扩展性和开放性. |
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Abstract: A V-bar flowmeter is introduced.The flowmaeter equipped with automatic pressure and temperature compensation and teletransmission.The operational principle,basic strucure and features of the flowmeter are described.
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文摘:介绍一种带压力、温度自动补偿的电远传楔型流量计，阐述了该流量计的工作原理、基本结构和性能特点。 |
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Abstract: A bandgap voltage reference is presented with a piecewise-linear compensating circuit in order to reduce the temperature coefficient.The basic principle is to divide the whole operating temperature range into some sub-ranges.At different tempera
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文摘:提出了一种采用分段线性补偿的方法来实现高精度带隙基准,其基本原理是将整个温度区间分为若干个子区间,在不同子区间上采用不同线性补偿函数达到最佳补偿.由于温度区间缩小,补偿误差也随之减小,从而在整个工作温度间上的补偿误差也缩小.理论上,只要温度子区间取得足够小,就可以达到任意精度.示例中将-40～120℃的温度区间仅分为三个子区间,平均温度系数就从1.5×10-5/℃减小到2×10-6/℃. |
