OALib Journal期刊

ISSN: 2333-9721




2019 ( 14 )

2018 ( 326 )

2017 ( 294 )

2016 ( 379 )


匹配条件: “ Liuzhu Wang” ,找到相关结果约114024条。
Salinity Variations over Zhejiang Province Waters, China  [PDF]
Xiaohui Zhao, Feng Gui, Venkata Subrahmanyam Mantravadi, Liuzhu Wang
Open Access Library Journal (OALib Journal) , 2018, DOI: 10.4236/oalib.1104562
In this article, we analyzed the monthly, seasonal and annual salinity variations and their relations with sea surface temperature (SST), rainfall over the Zhejiang province from 2005 to 2017. SST and rainfall were chosen as the main influence factors. There is an inverse relationship between rainfall and salinity. And the SST has a positive relation with salinity, showing slightly seasonal difference. The vertical variation is checked from surface to 150 meter depth, and 50 m is suggested to be a separating layer for salinity variations. We found that monthly changes in salinity are more variable in seawater at different depths. Seasonal changes in salinity in this area are significant. In winter and spring, the temperature is low, evaporation is small, and there is little rainfall, resulting in relatively higher salinity; frequent typhoon in summer and autumn with a large amount of freshwater input from the Yangtze River causes a lower salinity. For annual changes, we found an increasing trend over the surface as well as in sub-surface. In addition, we found initially that the stratification of the saline waters in Zhejiang Province makes the sub-surface salinity higher.
Water as dual functional cocatalyst: A theoretical study on the mechanism of direct aldol reaction on water catalyzed by a leucine derivative
QinQuan Rao,ShiWei Luo,LiuZhu Gong
Chinese Science Bulletin , 2010, DOI: 10.1007/s11434-010-3059-x
Abstract: The role of water and stereoselectivity in the direct syn-aldol reaction involving 3-pentanone and 4-nitrobenzaldehyde catalyzed by amino acid derivatives on water has been investigated by density functional theory. Calculations indicate that the formation of intermediate enamine is the rate determining step via a three-step process with activation enthalpies of 50 kcal/mol in the gas phase and 21 kcal/mol in the presence of water. The subsequent nucleophilic addition of enamine to aldehyde is relatively easier with activation enthalpies below 10 kcal/mol both in the gas phase and in the presence of water. The diastereoselective formation of syn- and anti-aldol products results from the preferential formation of Z-enamine to E-enamine, kinetically and thermodynamically. The enantioselectivity of both syn- and anti-products is controlled by the steric repulsive interactions between the amino alcohol moiety of catalyst and the phenyl ring of aldehyde. Calculations show that water molecule can act as a proton shuttle in the proton-transport catalytic processes. The water-assisted proton-transfer is very efficient to reduce the activation barriers via protonation and deprotonation in the formation of C-N and C-C bonds, dehydration, and β-elimination processes by inhibiting the generation of zwitterionic transition states. The theoretical discoveries indicate that in the present proton-transport assistance, the amino alcohol moiety of the catalyst plays a critical role as hydrogen bond donor to anchor substrates with carbonyl group close to the amine or enamine moiety so that the water molecule can bridge the NH of amine and the oxygen of carbonyl by hydrogen bonding interaction around the reactive site to activate the reactants and promote the reaction effectively.
Preserving and Utilizing Natural Enemy for Ecoagricultural Development--Integrated Control of Cotton bollworm by Conservation and Encouragement of Natural Enemies

Nan Liuzhu,

中国生态农业学报 , 1995,
Abstract: Since 1980s the food condition and inhabitation environment of cotton bollworm have been changed by the changing of cultivation system of crops.The main reason for the outbreak of cotton bollworm in the Yellow River Basin was the the destroy of ecological balance.Natural enemy,the same as water,soil,light,air,and heat,is part of agro-natural resources.Then is was suggested that the conservation and encouragement of natural enemies be included in the major projects of ecoagricultural developing strategies.The studies of key control techniques and basic theory should be strengthened up.
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.
A Research on the Relationship between FDI and Jiangsu’s Regional Economy Disparity  [PDF]
Baoqian Wang, Cheng Wang
Technology and Investment (TI) , 2012, DOI: 10.4236/ti.2012.33018
Abstract: Through reading and summarizing relevant articles, the authors analyze two different kinds of effects that FDI influence the regional economy. Location and digesting ability reflects such non-equilibrium. By using regression analysis, the authors discover, in south Jiangsu, which the unit FDI increase contributes most to the GDP development, with middle and north Jiangsu lagging behind. The regression coefficient is 1.198, 0.429 and 0.572 respectively. Considering the index of digestion ability, unit FDI increase and unit GDP contribution rate still share strong relevant relationship. However, the coefficients change. The effects that FDI stimulate GDP growth are weakened, been made up by the endogenous ability. The granger test shows that in south Jiangsu, there exists a cycle of accumulative effect, namely both the FDI increase and the GDP growth do well with each other. However, in the rest of Jiangsu province, such effect is not obvious. Considering the elements of location and digesting ability, this paper offers tactics for Jiangsu for a better coordinate of future development.
Causes of and Remedies for Chinglish in Chinese College Students’ Writings  [PDF]
Ping Wang, Weiping Wang
Open Journal of Modern Linguistics (OJML) , 2012, DOI: 10.4236/ojml.2012.22009
Abstract: Based on Interlanguage Theory and other theories, this study examines data from samples of Chinese college students’ writings and interviews with the students to explore the causes of and remedies for Chinglish (a term used to refer English with Chinese characteristics). It claims that Chinglish is mainly caused by syntactic transfer from Chinese, the influence of Chinese thought patterns, inadequate exposure to authentic English and insufficient practice in English writing. The interviews with the students showed that the proportion of L1 thinking decreased with the writer’s L2 development. The recommended remedies for Chinglish include raising students’ awareness of distinctions between English and Chinese, increasing their exposure to authentic English and practice in English writing, and adjusting their thought patterns.
An Entanglement Criterion for States in Infinite Dimensional Bipartite Quantum Systems  [PDF]
Yinzhu Wang, Danxia Wang
Journal of Quantum Information Science (JQIS) , 2012, DOI: 10.4236/jqis.2012.23013
Abstract: In this paper, an entanglement criterion for states in infinite dimensional bipartite quantum systems is presented. We generalize some of separability criterion that was recently introduced by Wu and Anandan in (Phys. Lett. A, 2002, 297, 4-8) to infinite dimensional bipartite quantum systems. In addition, we give an example aimed to illustrate the application of the theorem.

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