Publish in OALib Journal

ISSN: 2333-9721

APC: Only $99


Search Results: 1 - 10 of 663 matches for " ZEN JianXun "
All listed articles are free for downloading (OA Articles)
Page 1 /663
Display every page Item
Criterion for Appraising Scientific and Technical Journals

ZHU XiaoDong,SONG PeiYuan,ZEN JianXun,

中国科技期刊研究 , 2007,
Abstract: 科学技术期刊评估标准在20世纪70年代末国家科委着手研究制订。为了能准确反映每种科技期刊的共性及特色,首先对科技期刊进行了分类研究,确定科技期刊划分为学术、技术、科学普及、指导、检索五大类,并对五大类分别制订了各类的质量要求,在此基础上制定了五大类的评估标准。评估标准为便于操作,采用了百分制的原则。80年代末经各省、自治区、直辖市及各部委对所属期刊的评选优秀期刊实践后,加以修订,于1992年国家科委、中宣部、新闻出版署用此标准联合举办了首届全国优秀科技期刊评比。此后,经过进一步完善,国家科委于1994年正式颁发《关于颁布五大类科技期刊质量要求及评估标准的通知》(国科发信字1994]148号),要求科技期刊的管理、审读、期刊质量的白检白查、评选优秀期刊等工作,按此通知执行。
Characterization and Modeling of Urban Water Quality in the City of Calgary, Canada  [PDF]
Dhiraj Shrestha, Jianxun He
Natural Resources (NR) , 2017, DOI: 10.4236/nr.2017.88032
Abstract: Non-point source pollution (NPS) besides point source pollution (PS) has contributed to pollutant loading into natural receiving water bodies. Due to the nature of NPS, the quantification of pollutant loading from NPS is very challenging but crucial to riverine water quality management, especially for the river reach flowing through urban areas. The water quality in the river reach of the Bow River flowing through the City of Calgary in Alberta, Canada, is affected by both PS and NPS. Thus, understanding and characterizing water quality of discharges (affected by NPS) into the river reach is necessary for better managing riverine water quality and preventing water quality degradation. In the paper, monitored event mean concentrations (EMCs) of stormwater runoff and mean concentrations of snowmelt and baseflow of seven common pollutants from sub-catchments, which are categorized into four land use types including commercial, industrial, residential and on-going development land uses, were used to investigate the linkage between land use and water quality. Statistical analysis techniques were adopted to identify differences or similarities in water quality among different flow types, different land use types, and among/between catchments of same land use. The results indicated that EMCs of many water quality parameters vary among different land use types and among/between catchments of same land use. The results also showed median EMCs of pollutants of snowmelt and baseflow are, in general, lower than those of stormwater runoff. In addition, Stormwater Management Model was employed to investigate the physical process that would affect water quality response to storm events for two typical land uses, industrial and residential land uses. The modeling results supported that wash-off of particulate matters might primarily affect water quality response of catchments between different land uses. All the results shed the light on the necessity of quantifying pollutant loading considering the characteristics of land uses.
Local Gromov-Witten invariants of Blowups of Fano surfaces
Jianxun Hu
Mathematics , 2010, DOI: 10.1016/j.geomphys.2011.02.004
Abstract: In this paper, using the degeneration formula we obtain a blowup formulae of local Gromov-Witten invariants of Fano surfaces. This formula makes it possible to compute the local Gromov-Witten invariants of non-toric Fano surfaces form toric Fano surface, such as del Pezzo surfaces. This formula also verifed an expectation of Chiang-Klemm-Yau-Zaslow.
Local Donaldson-Thomas invariants of Blowups of surfaces
Jianxun Hu
Mathematics , 2011,
Abstract: Using the degeneration formula for Donaldson-Thomas invariants, we proved a formula for the change of Donaldson-Thomas invariants of local surfaces under blowing up along points.
Gromov-Witten Invariants of Blow-ups Along Points and Curces
Jianxun Hu
Mathematics , 1998,
Abstract: In this paper, using the gluing formula of Gromov-Witten invariants under symplectic cutting, due to Li and Ruan, we studied the Gromov-Witten invariants of blow-ups at a smooth point or along a smooth curve. We established some relations between Gromov-Witten invariants of M and its blow-ups at a smooth point or along a smooth curve.
Simulation of Power Flow and Protection of a Limited Bus Grid System with Injected Solar Power  [PDF]
Nader Barsoum, Chai Zen Lee
Energy and Power Engineering (EPE) , 2013, DOI: 10.4236/epe.2013.51008

In recent years, injection of renewable energy such as solar power into the power grid is increasing. However, inclusion of large-scale intermittent-type renewable energy requires better management in proper understanding of grid’s variable characteristics and its protection systems. In this paper, the investigation on overvoltage issue is illustrated. Overvoltage in distribution feeder occurs when large amount of solar power is injected at low power demand. Another investigation is on false operation of overcurrent relays due to reverse power to the 33 kV loads. The potential solutions to the two issues are illustrated in the small-sized power grid system using bi-directional inverters on AC buses in charging battery banks and adjusting the relay current settings. The benefits of solar power injection are illustrated whereby output power from generators is decreased and transmission losses are reduced. Electrical Transient Analysis Program (ETAP) was used for investigations.

Multiresolution Analysis and Haar Wavelets on the Laguerre Hypergroup
Peizhu Xie,Jianxun He
Mathematical Problems in Engineering , 2009, DOI: 10.1155/2009/975901
Abstract: Let ? be the Heisenberg group. The fundamental manifold of the radial function space for ? can be denoted by [0,
The Calder\'lcurlyborcurlybn Reproducing Formula Associated with the Heisenberg Group
Jinsen Xiao,Jianxun He
Mathematical Problems in Engineering , 2010, DOI: 10.1155/2010/132186
Abstract: We establish the Calderón reproducing formula for functions in 2 on the Heisenberg group H. Also, we develop this formula in (H) with 1<<∞.
Constructions of Vector-Valued Filters and Vector-Valued Wavelets
Jianxun He,Shouyou Huang
Journal of Applied Mathematics , 2012, DOI: 10.1155/2012/130939
Abstract: Let a  =(1,2,…,)∈? be an m-dimensional vector. Then, it can be identified with an × circulant matrix. By using the theory of matrix-valued wavelet analysis (Walden and Serroukh, 2002), we discuss the vector-valued multiresolution analysis. Also, we derive several different designs of finite length of vector-valued filters. The corresponding scaling functions and wavelet functions are given. Specially, we deal with the construction of filters on symmetric matrix-valued functions space.
Prediction of nonregular secondary structures of proteins based on wavelet analysis
Jianxun Qi,Yi Xiao
Chinese Science Bulletin , 2002, DOI: 10.1360/02tb9206
Abstract: The secondary structures of proteins fall into two classes: regular structure and nonregular structure. Helices and sheets are termed “regular” structures because their residues have repeating main-chain torsion angles, and their backbone N-H and C-O groups are arranged in a periodic pattern of hydrogen bonding. In contrast, the remaining structures with nonrepeating backbone torsion angles are called nonregular secondary structures. In this note, we performed an extensive sequence analysis of nonregular secondary structures and showed that these nonregular parts could be effectively predicted by continuous wavelet transform.
Page 1 /663
Display every page Item

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