oalib

Publish in OALib Journal

ISSN: 2333-9721

APC: Only $99

Submit

Any time

2020 ( 41 )

2019 ( 356 )

2018 ( 1901 )

2017 ( 1799 )

Custom range...

Search Results: 1 - 10 of 120151 matches for " WANG Qingeng "
All listed articles are free for downloading (OA Articles)
Page 1 /120151
Display every page Item
Eddy Covariance Tilt Corrections over a Coastal Mountain Area in South-east China: Significance for Near-Surface Turbulence Characteristics

LIU Li,WANG Tijian,SUN Zhenhai,WANG Qingeng,ZHUANG Bingliang,HAN Yong,LI Shu,

大气科学进展 , 2012,
Abstract: Turbulence characteristics of an atmospheric surface layer over a coastal mountain area were investigated under different coordinate frames. Performances of three methods of coordinate rotation: double rotation (DR), triple rotation (TR), and classic planar-fit rotation (PF) were examined in terms of correction of eddy covariance flux. Using the commonly used DR and TR methods, unreasonable rotation angles are encountered at low wind speeds and cause significant run-to-run errors of some turbulence characteristics. The PF method rotates the coordinate system to an ensemble-averaged plane, and shows large tilt error due to an inaccurate fit plane over variable terrain slopes. In this paper, we propose another coordinate rotation scheme. The observational data were separated into two groups according to wind direction. The PF method was adapted to find an ensemble-averaged streamline plane for each group of hourly runs with wind speed exceeding 1.0 m s-1. Then, the coordinate systems were rotated to their respective best-fit planes for all available hourly observations. We call this the PF10 method. The implications of tilt corrections for the turbulence characteristics are discussed with a focus on integral turbulence characteristics, the spectra of wind-velocity components, and sensible heat and momentum fluxes under various atmospheric stabilities. Our results show that the adapted application of PF provides greatly improved estimates of integral turbulence characteristics in complex terrain and maintains data quality. The comparisons of the sensible heat fluxes for four coordinate rotation methods to fluxes before correction indicate that the PF10 scheme is the best to preserve consistency between fluxes.
A IMPROVED A P METHOD
一种改进的A-P值控制法

Wang Qingeng,Wu Yueming,Li Zongkai,
王勤耕
,吴跃明,李宗恺

环境科学学报 , 1997,
Abstract: 在《城市大气污染总量控制方法手册》(国家环保局,1991)所介绍的AP值法的基础上,通过引入“影响风向”和“影响份额”的概念,合理地考虑了控制区内外高架点源对控制区的污染物总量的实际贡献,使得AP值控制法更为科学合理,且具有更广泛的适用性.
Scientific Problems in Current Numerical Studies of Tropospheric Ozone
当前对流层臭氧数值模式研究中的若干问题

Wang Qingeng,Han Zhiwei,Lei Xiaoen,
王勤耕
,韩志伟,雷孝恩

气候与环境研究 , 2002,
Abstract: Some scientific problems in the current numerical studies of tropospheric ozone are discussed. Topics include biogenic emissions of ozone precursors, tropospheric chemical mechanisms, meteorological models applied with air quality models, and compatibility between meteorological model and chemical model. Based on the problem discussion, research priorities in the future are also emphasized.
Estimation of biogenic VOCs emissions in Eastern China based on remote sensing data
基于遥感资料的中国东部地区植被VOCs排放强度研究

SONG Yuanyuan,ZHANG Yanyan,WANG Qingeng,AN Junling,
宋媛媛
,张艳燕,王勤耕,安俊岭

环境科学学报 , 2012,
Abstract: In order to study emission features of biogenic VOCs(BVOCs) in Eastern China,the widely-used model of emissions of gases and aerosols from nature(MEGAN) was adopted.Recent information on leaf area index(LAI) and leaf biomass density of vegetations were based on the remote sensing data.Up-to-date observations on emission factors were investigated from literature.Based on average conditions of vegetation and meteorology between the year 2008 and 2010,hourly biogenic emissions of BVOCs in eastern China were calculated,with spatial grid resolution of 10 km.The results showed that the total amount BVOCs emissions was 11.3×106 t(C),with isoprene(ISOP),monoterpene(MON) and other VOC(OVOC) accounting for 44.9%、31.5%,and 23.6%,respectively.Seasonal variations were significant,and contributions of spring,summer,autumn and winter to the yearly total were 11.2%,71.8%,14.1% and 3.0%,respectively.High emission intensities were usually found in Xing’an Mountain,Changbai Mountain,Qinling-Daba Mountain and southern hilly areas,generally between 1500 and 6500 kg · km-2 · a-1.Both total amount and intensities of emissions from provinces of Fujian,Guangdong,Jiangxi,Zhejiang,Hunan and Hubei are relatively high.Attentions should be paid on the interactions between BVOCs and anthropogenic pollutants(e.g.,nitrogen oxides) in these areas.The inventory of BVOCs emissions achieved in this study is an important groundwork for environmental and climate modeling.
Numerical study on bioaerosol dispersion over southeast coast of China
东南沿海生物气溶胶的扩散模拟研究

LIU Li,WANG Tijian,JIANG Ziqiang,LIU Qing,ZHUANG Bingliang,WANG Qingeng,SUN Zhenhai,
刘丽
,王体健,蒋自强,刘清,庄炳亮,王勤耕,孙振海

环境科学学报 , 2012,
Abstract: In this study, the Offshore and Coastal Dispersion (OCD) was nested in a regional dispersion model and then integrated in the Regional Air Quality Model System (RegAQMS). Meteorological and turbulent fields needed for RegAQMS were calculated with the Weather Research and Forecasting (WRF) model and the Atmospheric Boundary Layer model, respectively. The process of dry deposition, wet scavenging, temperature decay, humidity decay, biological aging, and ultra-violet radiation decay of bioaerosols were also incorporated into RegAQMS to describe distribution patterns of bioaerosol concentrations. In the case study of July and August 2008 at southeast coast of China, sensitivity tests of physical and biological process of foot-and-mouth virus were conducted with the improved RegAQMS and the simulated virus concentrations were used for risk and infection assessments. Results of sensitivity tests showed that the average surface concentrations in July and August reduced by 61.9% and 65.6%, respectively, and the contaminated areas reduced by 25.6% and 50.1% if all biological and physical processes were taken into account. Temperature decay was the principal process which affected virus concentration in summer. Biological aging, dry deposition, and wet scavenging were also significant. Relative humidity however had little influence on the concentration. Results of risk and infection assessments showed that most of the research areas were safe or at low level of risk, as reported by previous study. The areas with high level of risk were small, which primarily concentrated at the downwind of two dominating flow directions in the form of narrow strips. The areas of risk regions in July and August were 61.6% and 54.2%, respectively. Infection regions accounted for less than 1% of the whole research region. Ordered flow fields from inshore water and strait terrain contributed to a small diurnal fluctuation of wind direction and horizontal turbulent intensity, which resulted in wider virus diffusion and higher infection risk.
The method of regional air resource assessment and its application in the west coast of Taiwan Strait
区域空气资源的评估方法及其在台湾海峡西岸地区的应用

LIU Li,WANG Tijian,LI Zongkai,ZHUANG Bingliang,XIE Min,WANG Qingeng,SUN Zhenhai,
刘丽
,王体健,李宗恺,庄炳亮,谢旻,王勤耕,孙振海

环境科学学报 , 2011,
Abstract: To meet the requirements of regional atmosphere environment management, the concept of air resource was put forward. Then estimation and assessment methods were presented. A case study was conducted for the domain of the west of Taiwan Strait. Based on the analysis of climate characteristics and various weather systems associated with high levels of air pollution occurring in this area, both the regional and local meteorological fields were simulated with the Weather Research and Forecasting (WRF) model. The key factors that affected air resource significantly were selected from the meteorological fields and turbulence parameters. They acted as evaluating indicators of regional air resource. Each of the factors was classified and then graded to determine the weighted coefficient. The total scores of air resource in west Strait were estimated from the weighted sum of the respective factor scores. The levels of air resource were determined subsequently. Finally, spatial distribution of the overall scores and the levels of air resource were obtained. It showed that the air resource over the Strait was of the top grade (5) with the score 18. The grades in the rest were of 2 to 4 with the scores 14 to 18. In general, the air resource in coastal area was most abundant, in inland flat less and in mountainous area the least, showing an inhomogeneous pattern. The results indicated that the method proposed in this paper was a reasonable solution to assess regional air resource. There will be a great application prospect for regulation and management of atmosphere environment.
Software Industry Cluster be Disagreement on Theory and Practice  [PDF]
Yang Wang, Luqian Wang
Intelligent Information Management (IIM) , 2010, DOI: 10.4236/iim.2010.210069
Abstract: In the view of traditional industry cluster theory, it is easy to copy the software industry cluster pattern, or it is easy to copy another Silicon Valley, due to low reliability of the resources and the guidance factors of locations in software industry. But it is much more difficult to copy a Silicon Valley mode practically than imaginatively and the difficulties of bringing up and supporting high-tech initiatives is more than theoretic anticipation. In China, the software companies have just gathered together geographically and therefore no initiative center can be formed. All these above signify that software industry cluster is distinct from the traditional industry clusters, but the cognition of the reasons of software industry cluster is not clear yet. Furthermore, reasonable explanations of the bewilderment in the economical practice of software industry cluster are urgently needed.
The Economic Growth Effect of Logistics Industry FDI Analysis  [PDF]
Yang Wang, Luqian Wang
iBusiness (IB) , 2010, DOI: 10.4236/ib.2010.24049
Abstract: Based on the direction of the international FDI changed, from manufacturing to service industries, we should concern about the influence of the introduction of China’s logistics industry FDI to the national economy. The paper sets up regression model to examine logistics FDI and GDP in two aspects of time series and growth rate, we find that the logistics FDI reaches a high correlation with GDP, and logistics FDI is one of the major driving forces of economic development. Therefore, China should expand the introduction of logistics FDI, improve the quality of foreign investment, develop the positive economic growth effect of logistics FDI and promote the change of China’s economic growth pattern to ensure the development of China’s economy.
The Predictive Effects of Online Communication on Well-Being among Chinese Adolescents  [PDF]
Jinliang Wang, Haizhen Wang
Psychology (PSYCH) , 2011, DOI: 10.4236/psych.2011.24056
Abstract: Based on theories and previous studies on online communication, we proposed two hypotheses to better under- stand the effects of online communication on subjective well-being with a sample of Chinese adolescents (n = 190). The results of liner regression analysis found that online communication was positively related to adoles- cents’ subjective well-being. For boys, the coefficient of determination of online communication on subjective well-being was .143, and for girls the coefficient of determination was .040, indicating that boys benefit more from online communication than do girls.
The Impact of Radical Prostatectomy on the Survival of Patients with Carcinosarcoma of the Prostate  [PDF]
Jue Wang, Fenwei Wang
Journal of Cancer Therapy (JCT) , 2011, DOI: 10.4236/jct.2011.24064
Abstract: Background: The objective of this study was to evaluate the impact of radical prostatectomy on carcinosarcoma of the prostate. Methods: Patients diagnosed with carcinosarcoma of the prostate from 1977 through 2007 were identified in the Surveillance, Epidemiology, and End Results (SEER) database. Outcomes were examined with Kaplan-Meier survival analysis and Cox models. The association between clinical and demographic characteristics and survival of carcinosarcoma of the prostate was examined. Results: A total of fifty-four cases of histology confirmed carcinosarcoma of the prostate were identified. Median age of the patients was 74 years (range 28 - 94). Of the patients with a known tumor stage, all but one patient had a locally advanced or distant stage; all of the patients with known histology grade had poorly or undifferentiated histology. Twenty (37%) patients underwent transurethral resection only and Fourteen (25.9%) patients underwent radical prostatectomy. Eight (14%) patients received radiation therapy in combination with surgery. The median cancer specific survival was 16 months (95% CI 0 - 32 months). 1-, 3-, and 5- year cancer specific survival rate were 55.1%, 32.3% and 21.1%. In a multivariate analysis, radical prostatectomy was found to be a significant prognostic factor for cancer-specific survival. Conclusions: Carcinosarcoma of the prostate commonly occurs in older patients and associated with aggressive disease and poor prognosis. Radical prostatectomy is the only treatment modality that significantly improves survival. Emphasis on early diagnosis and detection and multimodality therapy of this disease is needed to improve the outcome for patients with this malignancy.
Page 1 /120151
Display every page Item


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