Publish in OALib Journal

ISSN: 2333-9721

APC: Only $99


Any time

2019 ( 43 )

2018 ( 988 )

2017 ( 1063 )

2016 ( 1150 )

Custom range...

Search Results: 1 - 10 of 55069 matches for " 汝永笑 "
All listed articles are free for downloading (OA Articles)
Page 1 /55069
Display every page Item
福州大学学报(自然科学版) , 2002,
Abstract: 用气相色谱模拟蒸馏技术进行了轻质原油混炼油加剂强化蒸馏实验 ,考察了活化剂种类及添加量对混炼油粘度与拔出率的影响 ,模拟结果经实沸点蒸馏实验验证 .结果表明 ,加剂强化蒸馏可以提高轻质原油混炼油的拔出率 ,经色谱模拟蒸馏筛选出的活化剂及其适宜的添加量下 ,混炼油的拔出率净增值可达2 %~ 3%.
图书情报工作 , 2011,
Abstract: ?对信息资源整合和信息服务整合存在的问题进行分析,对信息资源与信息服务整合必要性进行阐述,研究信息资源整合和信息服务整合的内外部环境,并结合整合案例分析国内外现状,提出信息资源与信息服务整合的发展方向与对策。
On the ethical concern for Chinese social vulnerable groups: Based on the perspective of Marx’s social organs theory

- , 2015, DOI: 10.11835/j.issn.1008-5831.2015.05.024
Abstract: 对转型期弱势群体的伦理关怀作为系统性的工程,其首要前提是确立适宜的审视角度。文章从马克思在《1844年经济学哲学手稿》中提出的社会器官范畴中引申出一种伦理关怀视角,并尝试结合阿马蒂亚·森的可行能力观对这一视角的理论内涵进行了当代延伸。在此基础上,文中依据所得视角聚焦中国转型期的社会性弱势群体现象,内外结合地分析了弱势群体社会器官的异化根源,并给出了基本的关怀举措,从而初建起一条以有效扩展弱势群体社会器官为价值指向的伦理关怀路径。
As a systematic project, the premise of ethical concern for the vulnerable groups in society is to establish appropriate review perspective. A perspective of ethical concern is derived in this article, which is based on the social organs category, described in Economic & Philosophic Manuscripts of 1844, by Karl Marx. And we attempt to combine Amartya Sen’s view on capability with the perspective to make a contemporary theoretical extension. On this basis, we focus on vulnerable groups in the transformation period of China based on the perspective, analyze the causes of the alienation of social organs of vulnerable groups by the combination method, and then propose pointedly several basic care initiatives. Finally, a path of ethical concern whose value point is to effectively extend the social organs of vulnerable groups is described.
生物化学与生物物理进展 , 1997,
Abstract: 蛋白质晶体的优化生长是获得高质量蛋白质晶体,进而得到高精度晶体结构的有效途径.针对不同的晶体生长方法,已尝试了不同的优化手段,这对改善某些蛋白质晶体的质量显示了明显的成效.然而,鉴于蛋白质晶体生长的多样性与复杂性,这些方面均未发展成为实用的技术.文章综述了这类研究进展,分析了各手段的利弊,并指出了应着重解决的问题.
生物工程学报 , 1992,
An Inverse Problem Based Approach for Differential SAR Tomography Imaging

Ren Xiao-zhen,Yang Ru-liang,

电子与信息学报 , 2010,
Abstract: When reconstructing elevation-velocity image, the observation data obtained from differential SAR tomography in baseline-time plane does not follow uniform distribution. If the elevation-velocity image of multiple scatterers is obtained using two-dimensional FFT method, the imaging result is not very good because of high sidelobes. In this paper, a new differential SAR tomography imaging algorithm is proposed based on Backus- Gilbert technique. In this algorithm, the elevation-velocity imaging is converted into an inverse problem of two- dimensional integral function, and Tikhonov regularization is used to get the regularized solution of the inverse problem. Simulation results show that the proposed algorithm can overcome the influence caused by non-uniform samples, and acquire better imaging result.
On Detection of Number of Tomography SAR Signals in the Elevation Direction Using the FB-MAPES Method
利用FB-MAPES算法估计Tomography SAR高度维信号源数

Ren Xiao-zhen,Yang Ru-liang,

电子与信息学报 , 2009,
Abstract: When using Tomography SAR combined with spatial spectrum estimation to solve layover effect, the number of signals should be estimated in the elevation direction first. The accuracy of number of signals is directly related to the following estimation performance. The conventional Information Theoretic Criteria (ITC) methods are usually influenced by multiplicative noise of the data, consequently, the performance of the estimation decreases. In this paper, a new method, FB-MAPES, is proposed to detect the number of signals. Then the performance of General Minimum Descriplion Length (GMDL) and FB-MAPES is compared via the Monte Carlo simulation. The experimental results confirm the validity of the FB-MAPES method. Moreover, the proposed method is prior to conventional ITC in detecting the number of tomography SAR signals in the elevation direction.
Study on Three-Dimensional Imaging Algorithm for Airborne Forward-Looking SAR

Ren Xiao-zhen,Yang Ru-liang,

电子与信息学报 , 2010,
Abstract: In this paper, an innovative airborne forward-looking SAR system using antenna array is studied, and a new three-dimensional imaging algorithm is proposed for airborne forward-looking SAR based on the image geometry and the characteristic of echo signal. A single SAR image was obtained with chirp scaling algorithm until all the receiving antennas have received echoes once. When plane flies along the track continuously, a sequence of two-dimensional SAR images in front of the flight path can be obtained. Then the three-dimensional image of forward-looking SAR can be obtained by focusing one section at an azimuth position one time with Range-Doppler algorithm until all the sections have been processed. Raw data of forward-looking SAR in X-band is simulated and three-dimensional image is achieved. The imaging result is analyzed, and simulation results confirm the validity of the proposed algorithm.
刚 薛爱红 朱梅 蔡少华
生物工程学报 , 1992,
蓉 秦进 汪维家 陆占?
计算机科学 , 2003,
Abstract: inthispaper,weanalyzethecauseandtypesofchinesetexterrors.basedontheweakrelationbetweentheerrorwordsanditsadjoiningwords,wedetectchinesetexterrorsusingbi-gramascomputationalmodel.inthismodel,bi-cooccurrenceprobabilit
Page 1 /55069
Display every page Item

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