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Search Results: 1 - 10 of 9300 matches for " PAN Chengzhong "
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Generation mechanism of woodland runoff and sediment on Loess Plateau under hypo-rainfall
黄土区次降雨条件下林地径流和侵蚀产沙形成机制

PAN Chengzhong,
潘成忠
,上官周平

应用生态学报 , 2005,
Abstract: Based on the long-term observation and from the viewpoints of water balance and runoff-and sediment generation, this paper studied the generation processes of runoff and sediment on two typical woodlands, artificial P. tabulaeformis and secondary natural P. dadidiana, and uncultivated slope-land in Loess Plateau under hypo-rainfall. The results showed that within the range of 5.0 - 50.0 mm rainfall, the total interception of canopy and litter was 15.45 % - 56.80 % for P. tabulaeformis and 20.56% - 47.81% for P. dadidiana, and decreased with increasing rainfall. Woodlands had a higher soil water infiltration capacity than uncultivated slope-land, especially in 0-20 cm soil layer. Both the two woodlands did not generate runoff under regular rainfall. Under the assumed rainfall of 2.5 mm x min(-1) intensity and 30 min duration, P. dadidiana stand did not produce runoff, but the runoff velocity and sediment-carrying capacity of uncultivated slope-land were 23.5 times, and runoff shearing stress and energy were 8 times as much as P. tabulaeformis stand. The runoff-and sediment generation on P. tabulaeformis stand decreased by 87.6% and 99.4%, respectively, compared with those on uncultivated slopeland, which was well accorded with the average observed value in runoff plots during 1988 - 2000. The theoretical analysis on the generation mechanism of woodland runoff and sediment may be effective to evaluate the benefits of forest in soil and water conservation.
QCD with zero, two and four flavors of light quarks - results from QCDSP
Chengzhong Sui
Physics , 1998, DOI: 10.1016/S0920-5632(99)85031-2
Abstract: We present the results from full QCD simulations with four flavors of light stag gered dynamical quarks on {\it {\it QCDSP}} supercomputer. Previous results are reproduced and the simulation reported here yields new results consistent with o ur previous runs. The hadron spectrum obtained with Wilson valence fermions reported here will allow us to determine if our earlier conclusions are independent of lattice form alism.
Effect of sediment physicochemical properties on phosphorus sorption for different size particles
不同粒径泥沙理化特性对磷吸附过程的影响

Cui Shuangchao,Ding Aizhong,Pan Chengzhong,Li Changji,Yan Zhenghong,Liu Yihui,Hao Lifen,
崔双超
,丁爱中,潘成忠,李长嘉,鄢正红,刘奕慧,郝丽芬

环境工程学报 , 2013,
Abstract: The surface sediments samples were collected from Nanhaizi Lake in Beijing. The phosphorus sorption behaviors on four particle size sediments including 0.147~0.246 mm(fine sand), 0.074~0.147 mm (very fine sand),0.0385~0.0740 mm(silt),<0.0385 mm (mixture of silt and clay) were determined. The effects of sediment organic matter (OM), TP, Fe, Ca,Al and Mn on phosphorus sorption were analyzed using correlation analysis and stepwise regression. The results showed that the second order kinetics model and Langmuir isotherm equation could well describe the behaviors of the phosphorus sorption with determining coefficients R2 of>0. 90). The maximum sorption mass (Xm) of different size particles was in the order of silt and clay>silt>fine sand>very fine sand. The content of OM, TP, Fe, Ca, Al and Mn increased with the decreasing particle size and the fraction of clay particles had more important effect on them than other particles. There was a significantly positive correlation (P<0.01) among the content of Fe,Ca,Al,Mn,OM. All these chemical compositions, especially Al, had a clearly positive effect on the Xm and equilibrium concentration (Cse) on the sediments. These results indicate that the phosphorus sorption could be jointly affected by both sediment particle size and chemical composition.
Parameter Identification of JONSWAP Spectrum Acquired by Airborne LIDAR Parameter Identification of JONSWAP Spectrum Acquired by Airborne LIDAR
YU Yang,PEI Hailong,XU Chengzhong
- , 2017,
Abstract: In this study, we developed the first linear Joint North Sea Wave Project(JONSWAP) spectrum(JS), which involves a transformation from the JS solution to the natural logarithmic scale. This transformation is convenient for defining the least squares function in terms of the scale and shape parameters. We identified these two wind-dependent parameters to better understand the wind effect on surface waves. Due to its efficiency and high-resolution, we employed the airborne Light Detection and Ranging(LIDAR) system for our measurements. Due to the lack of actual data, we simulated ocean waves in the MATLAB environment, which can be easily translated into industrial programming language. We utilized the Longuet-Higgin(LH) random-phase method to generate the time series of wave records and used the fast Fourier transform(FFT) technique to compute the power spectra density. After validating these procedures, we identified the JS parameters by minimizing the mean-square error of the target spectrum to that of the estimated spectrum obtained by FFT. We determined that the estimation error is relative to the amount of available wave record data. Finally, we found the inverse computation of wind factors(wind speed and wind fetch length) to be robust and sufficiently precise for wave forecasting
A Contextual Item-Based Collaborative Filtering Technology  [PDF]
Xueqing Tan, Pan Pan
Intelligent Information Management (IIM) , 2012, DOI: 10.4236/iim.2012.43013
Abstract: This paper proposes a contextual item-based collaborative filtering technology, which is based on the traditional item-based collaborative filtering technology. In the process of the recommendation, user’s important mobile contextual information are taken into account, and the technology combines with those ratings on the items in the users’ historical contextual information who are familiar with user’s current context information in order to predict that which items will be preferred by user in his or her current context. At the end, an experiment is used to prove that the technology proposed in this paper can predict user’s preference in his or her mobile environment more accurately.
The Impact of Macro Factors on the Profitability of China’s Commercial Banks in the Decade after WTO Accession  [PDF]
Qinhua Pan, Meiling Pan
Open Journal of Social Sciences (JSS) , 2014, DOI: 10.4236/jss.2014.29011
Abstract:

Profitability of China’s commercial banks has increased significantly since it joined the World Trade Organization (WTO). Constantly advancing of deepening the reform and increasingly fierce of international competition make us to be concerned more about macroeconomic factors. This paper makes an empirical analysis with a panel of 10 Chinese listed banks during the period 1998- 2012 to make a study of the potential impact of external factors may bring to China’s capital market. The results confirm that macroeconomic do have a substantial influence to the earning power of commercial banks, according to which some suggestions are made at the end of the paper.

Effect of Calcium Sprays on Mechanical Strength and Cell Wall Fractions of Herbaceous Peony (Paeonia Lactiflora Pall.) Inflorescence Stems
Chengzhong Li,Jun Tao,Daqiu Zhao,Chao You,Jintao Ge
International Journal of Molecular Sciences , 2012, DOI: 10.3390/ijms13044704
Abstract: Calcium is an essential element and imparts significant structural rigidity to the plant cell walls, which provide the main mechanical support to the entire plant. In order to increase the mechanical strength of the inflorescence stems of herbaceous peony, the stems are treated with calcium chloride. The results shows that preharvest sprays with 4% ( w/v) calcium chloride three times after bud emergence are the best at strengthening “Da Fugui” peonies’ stems. Calcium sprays increased the concentrations of endogenous calcium, total pectin content as well as cell wall fractions in herbaceous peonies stems, and significantly increased the contents of them in the top segment. Correlation analysis showed that the breaking force of the top segment of peonies’ stems was positively correlated with the ratio of water insoluble pectin to water soluble pectin ( R = 0.673) as well as lignin contents ( R = 0.926) after calcium applications.
Adaptive Recurrent Wavelet Fuzzy CMAC Tracking Control for De-icing Robot Manipulator
YaoNan Wang,ThanhQuyen Ngo,ThangLong Mai,ChengZhong Wu
Lecture Notes in Engineering and Computer Science , 2012,
Abstract:
NOD2 Polymorphisms Associated with Cancer Risk: A Meta-Analysis
Jingwei Liu, Caiyun He, Qian Xu, Chengzhong Xing, Yuan Yuan
PLOS ONE , 2014, DOI: 10.1371/journal.pone.0089340
Abstract: Background Emerging evidence indicated that common polymorphisms of NOD2 might impact individual susceptibility to cancer. However, the results from published studies were inconclusive. The aim of this meta-analysis was to elucidate whether NOD2 polymorphisms were associated with cancer risk. Methods A systematically literature search was performed by using electronic databases including PubMed and Web of Science. ORs and their 95% CI were used to assess the strength of association between NOD2 gene polymorphisms and cancer risks. Results Thirty case-control studies were included in this meta-analysis. The pooled analysis indicated that NOD2 rs2066842 C/T polymorphism was not significantly associated with cancer risk; for NOD2 rs2066844 C/T polymorphism, (TT+CT) genotype was associated with increased cancer risk compared with wild-type CC genotype (OR = 1.32, 95% CI = 1.01–1.72, P = 0.041); for NOD2 rs2066845 C/G polymorphism, individuals with (CC+CG) genotype were significantly associated with increased cancer risk compared with GG genotype (OR = 1.32, 95% CI = 1.01–1.72, P = 0.040); for NOD2 rs2066847 (3020insC) polymorphism, carriers of (insC/insC+insC/?) genotype were significantly associated with increased cancer risk compared with ?/? carriers (OR = 1.23, 95% CI = 1.10–1.38, P<0.001). In the subgroup analysis of cancer type, (insC/insC+insC/?) genotype was significantly associated with increased risk of colorectal cancer, gastric cancer and MALT lymphoma, breast cancer, lung cancer, laryngeal cancer but not with urogenital cancer, pancreatic cancer, melanoma or non-Hodgkin lymphoma. Conclusion NOD2 rs2066844 C/T, rs2066845 C/G and rs2066847 (3020insC) polymorphisms might be associated with increased cancer risk. No significant association was observed between NOD2 rs2066842 C/T polymorphism and cancer risk. Further large-scale and well-designed studies are still needed to confirm the results of our meta-analysis.
Association between PTEN Gene IVS4 Polymorphism and Risk of Cancer: A Meta-Analysis
Liping Sun, Jingwei Liu, Quan Yuan, Chengzhong Xing, Yuan Yuan
PLOS ONE , 2014, DOI: 10.1371/journal.pone.0098851
Abstract: Background Phosphatase and tensin homolog (PTEN) is a well established tumor suppressor gene. Recently, increasing studies investigated the association between PTEN IVS4 polymorphism (rs3830675) and risk of various types of cancer. However, the results from the individual studies were controversial. The aim of this meta-analysis was to elucidate whether PTEN IVS4 polymorphism was associated with cancer risk. Methods Databases including PubMed, Web of knowledge and Chinese National Knowledge Infrastructure (CNKI) were systematically searched to identify potentially eligible literatures. Odds ratios (OR) and their 95% confidence interval (CI) were used to assess the strength of association between PTEN IVS4 polymorphism and cancer risk. Results A total of seven case-control studies were finally included in this meta-analysis. The pooled analysis suggested that individuals with PTEN IVS4 (?/?) genotype were significantly associated with increased risk of cancer (OR = 1.45, 95% CI = 1.19–1.76, P<0.001) and subgroup of digestive tract cancer (OR = 1.67, 95% CI = 1.28–2.18, P<0.001) compared with (+/+) genotype. The allele analysis revealed that (?) allele was significantly associated with increased risk of cancer (OR = 1.30, 95% CI = 1.12–1.50, P = 0.001) and subgroup of digestive tract cancer (OR = 1.42, 95% CI = 1.16–1.74, P = 0.001) compared with (+) allele. No significant association was observed between PTEN IVS4 (+/?) genotype and risk of cancer. Conclusion PTEN IVS4 (?/?) genotype was significantly associated with increased risk of cancer especially for digestive tract cancer compared with (+/+) genotype. The (?) allele of PTEN IVS4 (rs3830675) polymorphism was significantly associated with increased risk of cancer especially for digestive tract cancer compared with (+) allele. The recessive effect model and dominant effect model also demonstrated significant association between PTEN IVS4 (rs3830675) polymorphism and increased cancer risk especially for digestive tract cancer. Further large-scale and well-designed studies regarding different ethnicities are still required to confirm the results of our meta-analysis.
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