oalib

Publish in OALib Journal

ISSN: 2333-9721

APC: Only $99

Submit

Any time

2019 ( 325 )

2018 ( 5904 )

2017 ( 6072 )

2016 ( 6465 )

Custom range...

Search Results: 1 - 10 of 260560 matches for " 李毅 "
All listed articles are free for downloading (OA Articles)
Page 1 /260560
Display every page Item
非线性无力场的Low-Lou解法探讨
On the Low-Lou Approach for the Nonlinear Force-Free Magnetic Field
 [PDF]

秦剑,
Advances in Applied Mathematics (AAM) , 2016, DOI: 10.12677/AAM.2016.52022
Abstract: 非线性无力场是天体物理中的重要数学模型,它是一套非线性偏微分方程组,经常用于太阳及恒星磁场的理论研究。在轴对称情形下,该方程组归化为满足特定边界条件的带有未知参数的二阶非线性常微分方程,此即所谓的Low-Lou解法。本文提出一种参数打靶法,作为对Low-Lou解法的探讨和补遗,并给出更多可选的数值无力场。
Nonlinear force-free magnetic field is an important mathematical model in astrophysics, which is a set of nonlinear partial differential equations, often used in the theoretical studies of solar and stellar magnetic fields. In the axisymmetric case, this set of partial differential equations is reduced into a nonlinear ordinary differential equation of second order with an unknown parameter, satisfying certain boundary condition. This is the so-called Low-Lou approach of the problem. In this paper, we propose a parametric shooting method as a technical supplement for the Low- Lou approach, offering more optional numerical force-free magnetic fields.
大别山北麓姚冲钼矿床地质特征及找矿标志

地质与勘探 , 2013,
Abstract: 河南省新县姚冲钼矿床是大别山北麓新发现的又一典型的斑岩型钼矿床,目前控制规模为中型。矿体主要赋存于花岗斑岩体(脉)外接触带(中元古界蚀变片麻岩),受隐伏岩体和构造控制。辉钼矿化呈浸染状、细脉-网脉状、薄膜状和角砾状产出。围岩蚀变主要有硅化、钾长石化、黄铁矿化、绢云母化、绿泥石化、绿帘石化、方解石化、萤石化和高岭土化等,具典型斑岩型钼矿床的矿化和围岩蚀变特征。其中硅化和钾长石化与钼成矿关系密切。矿床蚀变分带明显,由中心向外侧依次为钾长石化-硅化带(强蚀变带)、硅化-绢英岩化带(弱蚀变带)、硅化-青磐岩化带,由中心向外围蚀变强度逐渐变弱。蚀变作用的强弱与钼矿体的品位高低相对应,硅化和钾化为该区最直接的找矿标志之一。
“亚洲工业技术情报网”部分成员国的科技情报工作观感

图书情报工作 , 1982,
Abstract: ?根据中国和加拿大两国科技合作协议,我国派代表团赴“亚洲工业技术情报网”的部分成员国和地区的成员组织进行考察。代表团由中国科技情报研究所和北京、天津、上海、广东、四川、辽宁、江苏常州等省、市科技情报研究所的代表共10人组成,于1981年7月21日至8月8日,对菲律宾、马来西亚、新加坡、泰国、香港等国家和地区进行了为期19天的参观访问。这次出访的目的是:①了解“亚洲工业技术情报网”为中小型企业提供科技情报服务的内容和组织措施,以及开展工作的方式、方法和效果;②参观有关科技情报单位,了解科技情报工作的结构、体制和特点,以及它对本地区社会经济发展所起的作用;③联系同行,广交朋友,开展友好活动,促进我国与该地区情报部门的联系和合作。
贷款利润率的神经网络预测技术

武汉理工大学学报 , 2006,
Abstract: ?介绍对银行贷款利润率的主要影响因素,基于改进型人工神经网络建立了贷款利润率的神经网络预测模型。在贷款利润率的神经网络预测系统中采用信息传输tanh函数。取代sigmoid函数,通过验证证实tanh函数提高了贷款利润率的预测精确度。测试表明:采用tanh信息传输函数,预测误差率能降低0.045。
ipv4头部校验和的反码算法

武汉理工大学学报 , 2003,
Abstract: ?给出了正整数反码加法和补码加法间关系的2个定理。在此基础上,给出了ipv4头部校验和2个反码算法
财务票据报表的网上传输安全隧道构建

武汉理工大学学报 , 2008,
Abstract: ?为保证传输财务报表和票据的安全,在单位财务虚拟专用网上建立基于ipsec安全协议的安全隧道。利用ipsec协议实现了网络层的加密与认证。介绍了财务账户方式的类型,侧重论述安全隧道的构建技术,以实现在安全隧道传输财务票据和报表。
论“社会学概论”教材的章节体系

社会学研究 , 1990,
Abstract: 社会学自1979年3月在中国恢复重建以来已经10年多了。国内公开出版的“社会学概论”教材已有十余种。在此基础上,全国统编“社会学概论”教学大纲正在酝酿。全国统编大纲一经颁行,必将对刚刚走出初创阶段的我国社会学的研究和教学产生不小的影响。为使决策科学化,社会学界理应对这本入门教材的章节体系做些探讨。
超大深基坑工程承压水控制设计及施工技术研究
Research on Control and Construction Technologies for Confined Water in Supper Deep Foundation Pit
 [PDF]

李红军, 张洁,
Hans Journal of Civil Engineering (HJCE) , 2015, DOI: 10.12677/HJCE.2015.41001
Abstract:
论文针对北京某深大基坑承压水降水工程特点,选取了管井降水方式,计算提出了井距8 m和井深36 m设计方案;并创造性地提出了分区封闭、临时封闭等施工措施,降低了降水施工难度;通过地下水水位的监测和周边沉降监测,验证了本设计的合理性。最后,提出了井水的二次利用方案,提高了地下水的利用效率,符合绿色施工理念。
According to the characteristics of a dewatering engineering for the deep confined water foundation pit in Beijing, tube well precipitation is selected and the design parameters of well spacing in 8 m and 36 m are proposed. The construction measures as partition closed, temporarily closed, etc. are put forward to reduce the difficulty of precipitation construction creatively. To verify the rationality of the design, the underground water table and peripheral subsidence are monitored. Finally, the secondary utilization scheme of well water is put forward to improve the utilization efficiency of groundwater, which is accord with the concept of green construction.
电力通信网设备网管自动化测试平台研究
Automatic Test Platform for Network Management of Electric Power Communication Network
 [PDF]

付佳佳,, 财云
Smart Grid (SG) , 2016, DOI: 10.12677/SG.2016.61003
Abstract:
本文提出了一种电力通信网设备网管自动化测试平台,该平台涉及多接口技术适配领域。多接口技术适配模块主要负责依据给定的参数封装网管接口消息报文并发送给被测NMS系统或被测EMS系统,以及接收并解析被测系统响应消息。本文所提测试平台能够根据测试任务的具体内容将测试任务分配给不同的测试仪,提高了测试的有效性,同时测试仪具有在线和离线两种工作模式,使得测试更加方便灵活。
This paper presents an automatic test platform for network management of electric power com-munication network, which involves the field of the multi-interface technology. Multi-interface technology adapter module is mainly responsible for the information of the network management interface message packet and sent to the tested NMS system or measured EMS system, as well as receiving and analyzing the response message of the system. The test platform can distribute test tasks to different testers according to the specific content and improve the effectiveness of testing. And, test instrument with online and offline work makes the test more convenient and flexible.
交通控制硬件在环仿真系统设计与实现
Simulation System Design and Implementation of Traffic Control Hardware-in-the-Loop
 [PDF]

发达, 何坚,
Modeling and Simulation (MOS) , 2016, DOI: 10.12677/MOS.2016.53010
Abstract: 针对交通控制策略仿真困难的问题,本文在分析硬件在环仿真原理的基础上,提出交通控制硬件在环仿真系统架构。其中,仿真控制软件作为整个系统的核心,负责仿真过程的控制、管理;交通控制机完成控制策略的发布与感应控制;微观仿真软件完成对控制策略的仿真评价;信号转换设备实现数字信号到模拟信号的转换,完成交通控制机与微观仿真软件之间的通信。最后本文以汉世通HST-3000交通控制机和VISSIM微观仿真软件为基础,开发了仿真控制软件,构建交通控制硬件在环仿真系统。实验证明该系统可以实现对交通控制策略的有效仿真,验证了仿真系统的有效性。
Aiming at the difficulty of current traffic control strategies simulation, this paper proposes simu-lation system architecture of traffic control strategies hardware-in-the-loop after analyzing the principle of hardware-in-the-loop simulation. The simulation control software as the core of the whole system is responsible for simulation process control and management; the traffic controller completes traffic control strategies release and induction control; the microscopic simulation software completes the simulation and evaluation of traffic control strategies; the signal converter achieves digital signal to analog signal conversion and allows the communication between the traffic controller and microscopic simulation software. Finally, the simulation control software is developed and simulation system of traffic control strategies hardware-in-the-loop is built based on HST-3000 traffic controller and VISSIM microscopic simulation software. Experiments show that the system can achieve effective simulation of the traffic control strategies and verify the effectiveness of the simulation system.
Page 1 /260560
Display every page Item


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