oalib

Publish in OALib Journal

ISSN: 2333-9721

APC: Only $99

Submit

Any time

2019 ( 342 )

2018 ( 6733 )

2017 ( 6975 )

2016 ( 7431 )

Custom range...

Search Results: 1 - 10 of 308594 matches for " 李兴玉? "
All listed articles are free for downloading (OA Articles)
Page 1 /308594
Display every page Item
基于LabVIEW面向对象技术的某型电路板测试系统
Board Inspection System Based on Object-Oriented Technology of LabVIEW
 [PDF]

,, 元垒, 董绪华
Artificial Intelligence and Robotics Research (AIRR) , 2013, DOI: 10.12677/AIRR.2013.21010
Abstract:
本文介绍了基于LabVIEW面向对象技术的某型电路板检测系统,通过面向对象程序设计方法(Graphical Object-Oriented Programming),将现有代码分解为一个个离散的模块,充分利用面向对象设计与开发的优点与好处,最终实现电路板检测任务。
This article introduces the certain board inspection system based on object-oriented technology. Through the methods of graphical object-oriented programming, to separate this system into several discrete models. Using the merits of object-oriented sufficiently to realize inspecting boards eventually.
基于LabSQL的数据库访问技术
Database Access Technology Based on LabSQL
 [PDF]

, 旭东, 董绪华,, 陈晔
Artificial Intelligence and Robotics Research (AIRR) , 2013, DOI: 10.12677/AIRR.2013.22014
Abstract:
本文总结并比较了用LabVIEW访问数据库的几种方法,重点介绍了LabSQL数据库访问工具包,说明了在LabVIEW环境下,利用LabSQL实现与数据库交互的方法,实现某型人才数据管理任务。将其综合利用,可实现复杂的数据库操作。
In this article, some kinds of methods that LabVIEW used to access database are summarized and compared with, and LabSQL database access kit has been introduced emphatically. It explains the method of data exchange using LabSQL in LabVIEW. It has been applied to the certain talent management system. It can also carry out complex data-base operations if integrated.
离合器动态过程建模与仿真
,宋健,
公路交通科技 , 2004,
Abstract: 在分析膜片离合器接合、分离过程动力学的基础上,根据摩擦学原理提出离合器过度动态过程的数学模型,此过程比静态模型更加准确地描述了离合器接合、分离的动态过渡过程,并给出仿真结果,为离合器自动控制提供理论基础。
对容积法计算气藏采收率和可采储量的修正
,鸿
天然气工业 , 2001,
Abstract: ?通常在应用容积法计算气藏采收率和可采储量时,一方面,未考虑到容积法探明地质储量存在一定误差及其没有完全反映气藏中天然气的可流动性,误把动态储量采收率当作容积法地质储量采收率,导致计算的可采储量偏大;另一方面,忽视了水驱气藏原始和废弃条件下的含气饱和度的差异。从而导致公式应用的错误和计算结果的失真。文章以理论分析结合实例计算,提出了气藏动态储量与动态法采收率才是一一对应的逻辑匹配关系,由两者计算的可采储量是合理、正确的;而容积法储量采收率应根据动态储量采收率及动态储量与容积法储量之比例来折算。动态储量采收率具备横向可比性,容积法储量采收率则不然。同时,提出对于水驱气藏应考虑原始与废弃时含气饱和度的差异,从而进一步修正了容积法计算气藏采收率和可采储量的方法。
威远和资阳震旦系天然气地球化学特征与含气系统研究
王顺,
天然气地球科学 , 1999,
Abstract: ?详细阐述了威远气田和资阳地区震旦系气藏天然气的地球化学特征,包括天然气的组成、碳同位素和储层沥青抽提物的生物标志化合物的分布特征,认为下寒武统的筇竹寺组泥岩是威远、资阳震旦系气藏的主要烃源岩,同时对寒武系―震旦系含气系统的基本特征和形成过程进行了论述。
cao过剩型ca1-xzro3-δ陶瓷的阻抗行为研究
,
材料研究学报 , 2012,
Abstract: ?采用共沉淀法制备cao过剩型的ca1-xzro3-δ,用交流阻抗法研究了阻抗行为。结果表明:c1.2z试样前驱体在1000℃焙烧后生成较纯的斜方cazro3相;试样的总电导率随着温度的升高而显著增大,其活化能为1.17ev;随着温度的升高,试样的弛豫时间和电容均显著减小;在低温晶界的介电常数明显高于晶粒的,进而推测出氧离子缺陷分布不均和cao对ca1-xzro3-δ基体的非均匀;随着温度的升高介电常数显著减小,表明氧空位的分布逐渐趋于均匀化。
基于补偿设备混合配置策略的电力系统无功规划
Reactive power planning using different VAr devices

,,陈昊
- , 2017, DOI: 10.3969/j.issn.1001-0505.2017.02.017
Abstract: 为满足电力系统在稳态运行条件下和暂态过程中的多种电压稳定性约束要求,根据现有无功补偿设备所具有的动态、静态不同的特性,基于模糊聚类法、动态电力系统理论和优化方法,研究了电力系统不同的运行方式下混合配置并联电容器组、SVC的无功规划模型及方法.在IEEE30节点系统算例分析中,首先基于模糊聚类理论及最优化理论采用成本较低的并联电容器组进行满足静态稳定约束的无功规划;然后利用SVC的快速响应特性,基于动态电力系统的理论模型进一步实现了不同工况下考虑严重故障后短期稳定约束的电力系统无功规划.算例分析表明,有效配置多种类型的无功补偿设备资源,能够在保证经济性的同时,实现满足不同稳定约束要求的无功规划.
To satisfy the different voltage stability constraints at different load levels for both stability operation condition and transient process, based on the different dynamic or static operation characteristics of reactive power compensators, the mixed allocation of shunt capacity bank(SCB)and static var compensator(SVC)were investigated using fuzzy clustering method, dynamic power system theory and optimization method under different operation levels. In the IEEE 30-bus system case study, reactive power planning(RPP)with static stability constraints was firstly carried out based on the fuzzy clustering method and the optimization method using the lower cost SCB, then RPP with short term stability constraints at different load levels and contingencies was further investigated by the help from dynamic characteristics of SVC. Study results indicate that the optimal allocation of different types of VAr devices can satisfy different stability constraints while ensuring economy requirements
双相不锈钢管固液两相流动腐蚀的数值模拟
刘景军,,,,
化工学报 , 2004,
Abstract: 在碳钢流动腐蚀数值模拟的基础上,针对管道流动体系,对固液两相流条件下双相不锈钢的流动腐蚀进行了数值模拟.模拟了固液两相流体动力学过程和双相不锈钢腐蚀动力学过程,模拟计算得到的腐蚀速率与实测值基本一致,表明建立的两相不锈钢流动腐蚀的综合数学模型是正确的,揭示了两相流中双相不锈钢的流动腐蚀机理,并进行了实验验证.两相流中双相不锈钢流动腐蚀的加剧主要是由于颗粒相的存在会大大强化液相流体的流体力学因素,导致钝化膜内传质速度加快所致.计算结果同时也表明,对于表面覆盖有钝化膜的材料的数值模拟,建立合理的流动腐蚀动力学模型是数值计算方法应用成功与否的关键.
碳钢在固/液两相流条件下流动腐蚀的数值模拟
刘景军,,,,
化工学报 , 2004,
Abstract: 在单相流数值计算的基础上,引入固相颗粒运动理论,对双相流中的碳钢磨损腐蚀进行了数值模拟.结果表明:在0~18m?s-1流速范围内,固体颗粒与材料壁面的碰撞角度、碰撞频度和碰撞速度等颗粒相力学参数对表面切应力、传质系数影响强烈,导致碳钢磨损腐蚀加剧,但对碳钢的切削磨耗作用不大.腐蚀速度的模拟计算值与实测值基本一致,验证了碳钢在两相流加剧腐蚀的协同效应中腐蚀电化学作用仍占主导地位.随着流速进一步增大,磨耗量虽小,但会有所增加.
基于GIS技术的县级生态公益林质量评价
County-Level Quality Evaluation of Ecological Public Welfare Forest Based on GIS Technology
 [PDF]

沈发,, 徐爱珍, 赟璟, 万佳蕾, 王伟峰
Hans Journal of Soil Science (HJSS) , 2015, DOI: 10.12677/HJSS.2015.33003
Abstract:
对生态公益林质量进行科学评价是提高森林资源经营管理水平的重要环节,也是生态公益林信息管理系统建设过程中的重要组成部分。以县级生态公益林为研究对象,综合运用地理信息系统技术平台,利用森林资源“二类调查”小班数据库为信息源,建立了县级生态公益林地理信息管理系统,对生态公益林实行动态化、可视化和科学化管理。采用频度统计法、理论分析法、专家咨询法等筛选评价指标,用AHP法确定各指标的权重,构建了基于“二类调查”数据的生态公益林质量评价指标体系。利用建立的地理信息数据库中公益林小班信息,依据生态公益质量评价指标体系,采用固定小班评价法对生态公益林进行质量评价。
Ecological public welfare forest quality scientific evaluation is an important link to improve forest resource management level, and an important part of ecological public welfare forest information management system construction process. This study which by the county-level ecological public welfare forest as research object, integrate application geographic information system technology platform, use of forest resources that “second-class survey” sub-compartment database for information sources, established the county-level ecological public welfare forest geographic information management system. The ecological public welfare forest can achieve dynamic, visual and scientific management. Frequency statistics method, theoretical analysis, expert advice and other methods were adopted to screen out evaluation indexes, and AHP method was used to determine each index weight. An index system was constructed based on the “second-class survey” data to evaluate the quality of ecological public welfare forest. Finally, based on ecological public welfare forest quality evaluation index system, use of public welfare forest sub-compartment information by geographic information database was established, adopting fixed sub-compartment evaluation method to evaluation ecological public welfare forest quality.
Page 1 /308594
Display every page Item


Home
Copyright © 2008-2017 Open Access Library. All rights reserved.