oalib

Publish in OALib Journal

ISSN: 2333-9721

APC: Only $99

Submit

Any time

2020 ( 9 )

2019 ( 74 )

2018 ( 636 )

2017 ( 626 )

Custom range...

Search Results: 1 - 10 of 27275 matches for " 范哲哲 "
All listed articles are free for downloading (OA Articles)
Page 1 /27275
Display every page Item
按照生育规律,抓早、抓细、抓实

人口研究 , 1982,
Abstract: ?<正>今年2月,党中央《关于进一步做好计划生育工作的指示》要求:“要把人口计划纳入国民经济和社会发展计划,按照生育规律,抓早、抓细、抓实。”抓早、抓细、抓实,这是在新形势下提高计划生育工作质量的重要工作方法,也是对计划生育干部的具体要求。
数字原住民采纳社会化媒体影响因素的扎根研究
A Study on the Influence Factors of Digital Aboriginal Adoption of Social Media Based on Grounded Theory

,
- , 2017,
Abstract: 摘要 文章利用扎根理论的方法,基于30 个数字原住民样本的深度访谈和焦点小组资料,通过开放式编码、主轴编码、选择性编码和理论饱和度检验等几个步骤,归纳出影响数字原住民采纳社会化媒体的19个概念范畴并发展为5个主范畴,构建了数字原住民采纳社会化媒体影响因素模型。结果表明,动机和情感感知是影响数字原住民社会化媒体采纳的内部因素,平台功能与社会情境是外部因素,能力特征对动机与采纳行为之间的强度关系起到调节作用。
Abstract: This paper, based on grounded theory, depth interviews and focus group were carried out for 30 samples,through the open coding, the axial coding, the selective encoding, and theoretical saturation test, sums up 19 conceptual categories that affect the social media adoption of digital natives, and develops into 5 main categories, and constructsa model of the influence factors in social media adoption. The results show that motivation and emotion perception are the internal factors that affect the social media adoption of digital natives, platform function and social context are external factors, ability characteristics play a role in regulating the strength of motivation and the adoption behavior.
Hom-李Color代数的广义导子
Generalized Derivations of Hom-Lie Color Algebra
 [PDF]

周金森, 广
Pure Mathematics (PM) , 2016, DOI: 10.12677/PM.2016.63028
Abstract:
首先回忆与Hom-李color代数相关的概念,并且给出它的广义导子、拟导子、中心导子、型心和拟型心的定义。进一步地,研究这些导子之间的性质和联系。最后得到广义导子可以写成拟导子与拟型心之和。
Firstly, we recall some concepts associated with a Hom-Lie color algebra. Moreover, we give the definitions of the generalized derivations, quasi-derivations, center derivations, centroids and quasi-centroids. Furthermore, we investigate some properties and connections between these de-rivations. Finally, we obtain that the generalized derivations are equal to the sum of quasi-deriva- tions and quasi-centroids.
氧化铝负载二苯基硫脲分离富集电感耦合等离子体原子发射光谱测定铂、钯、金和铑

分析化学 , 2002,
Abstract: 地质样品中痕量的铂族元素须经富集处理后测定,离子交换法、火试金预浓集、Se,Te共沉淀富集等分离富集方法,操作繁琐、复杂。本文采用氧化铝负载二苯基硫脲分离富集电感耦合等离子体原子发射光谱法(ICPAES)测定地质样品中痕量Pt、Pd、Au和Rh,发现加入SnCl2可以大幅度地提高Pt和Rh的回收率,方法简单、快速。
活性氧化铝微柱分离富集-电感耦合等离子体原子发射光谱法在线测定水中铬Ⅲ和铬Ⅵ

分析化学 , 2003,
Abstract: 研究了活性氧化铝对CrⅢ和CrⅣ分离富集的性能,建立了流动注射FI-在线微柱分离富集-电感耦合等离子体原子发射光谱(ICP-AES)法测定水中微量CrⅢ和CrⅣ的分析方法.优化了流动注射测定的条件,进样频率为60/h;检出限(3σ):CrⅣ为0.8μg/L,CrⅣ为0.6μg/L;线性范围为5~600μg/L;相对标准偏差小于2.4%;回收率为94.0%~102%.
A Partitioning Algorithm for a Distributed Virtual Environment
分布式虚拟环境中的一种场景动态划分算法—基于竞争的演化算法

,顾毓清
计算机科学 , 2001,
Abstract: With the development of networking technologies and computer graphics, distributed virtual environment (DVE) has become an important research area in computer science. In a DVE system, clients at different places can simultaneously explore a virtual world and interact with each other. How to build an efficient DVE system that can support large number of concurrent users is a challenge. In the paper, we discuss the way of partitioning the DVE world to balance the workload among different servers as well as minimize the inter-server communication. We present the existent mathematics mode and algorithms at first, and then give our algorithm, partitioning algorithm based on competition. Ex- periments are carried out to illustrate the effectiveness of our proposed algorithm.
运城盐湖十种耐盐植物体内无机及有机溶质含量的比较研究
张海燕?,峰?
生态学报 , 2002,
Abstract: 运城盐湖的10种耐盐植物体内的有机及无机溶质含量差异较大。总无机溶质含量在各种植物间的变化幅度小于总有机溶质,其中双子叶植物(除二色补血草外)地上部k+含量及k/na比均低于单子叶植物,而双子叶植物地上部的na+含量明显高于单子叶植物。双子叶植物(除二色补血草外)的na/cl>1,而单子叶植物的na/cl≈1。二色补血草的二价离子ca2+和mg2+含量较高。单子叶植物的可溶性糖及游离氨基酸含量高于双子叶植物(除枸杞外),碱莞、盐角草、盐地碱蓬、碱地肤、二色补血草的脯氨酸含量均较低(<7μmol/gfw),且脯氨酸占游离氨基酸的比例高于其它植物。另外还计算了各种溶质占cop的百分比,并讨论了它们在植物渗透调节过程中的作用。
城市公共交通电动化的快速充电技术应用
Fast Charging Technology Used in Electrical Applications for Urban Public Transport
 [PDF]

刘永相, 侯兴, 继宁, 杨晞, 郑可
Smart Grid (SG) , 2011, DOI: 10.12677/sg.2011.11006
Abstract: 现有电池技术条件下,电动汽车面临着“买不起,用不起”的窘况。快速充电技术可以减少电池数量,可改变这一现状。新型钛酸锂电池可快速充电,寿命长,应用于此电池的快速充电技术在公共交通电动化应用中已得到较好的应用,快速充电站也具有较高的投资收益,本应用技术值得推广。
Under the existing battery technology, the development of electric Vehicle faces a new problem, that “It is easy to buy an electrical vehicle, however it is difficult use”. And this problem slow down the development of the electric vehicle until fast charging technology rises up recently, which can reduce the number of battery cells installed in the electric vehicles. In addition, novel fast charge lithium titanate battery, long life, can be applied to the urban public transport, and have a better Demonstration Application, meanwhile, the fast charging station also has a high return on investment, the application of technology should be promoted.
脆性岩石断裂破坏机理的边界配位法分析
谢和平,,天佑
力学学报 , 1998, DOI: 10.6052/0459-1879-1998-2-1995-122
Abstract: 针对裂纹表面承受载荷时的应力条件,提出了新的应力函数,该应力函数对于各种裂纹模型、各种边界条件、各种边界形状、裂纹表面自由或承受均布载荷等均适用.并利用边界配位法,计算了在压缩载荷下,岩石内部裂纹的应力强度因子(SIF),给出了关于岩石断裂破坏的一些新结论
基于小波传递性函数的结构损伤识别研究
,冯新,周晶
地震工程与工程振动 , 2014, DOI: 10.13197/j.eeev.2014.05.28.fanz.004
Abstract: 局部损伤所引起的结构特性改变将导致不同自由度之间的传递特性发生变化,而传递性函数的改变可用于结构损伤识别。但是,基于Fourier变换的传递性函数对结构轻微局部损伤不够敏感。本文利用小波变换的时-频多分辨率特性,在小波域内构造了一种新的传递性函数,并且结合统计学中的离群值分析,建立了基于小波传递性函数的结构损伤探测方法。最后通过一个斜拉桥模型试验对方法的可行性予以验证。研究表明,所提出的小波传递性函数指标对结构损伤十分敏感,利用本文的损伤探测方法可以有效地对结构的轻微损伤进行识别。
Page 1 /27275
Display every page Item


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