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Search Results: 1 - 10 of 31593 matches for " DENG Hui "
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The Wiener polarity index of molecular graphs of alkanes with a given number of methyl groups
Journal of the Serbian Chemical Society , 2010,
Abstract: The Wiener polarity index of a graph G is the number of unordered pairs of vertices {u,v} of G such that the distance between u and v is equal to 3. In this paper, the maximum Wiener polarity index of molecular graphs of alkanes with a given number of methyl groups is studied.
A Compact Orbital Angular Momentum Spectrometer Using Quantum Zeno Interrogation
Paul Bierdz,Hui Deng
Physics , 2014, DOI: 10.1364/OE.19.011615
Abstract: We present a scheme to measure the orbital angular momentum spectrum of light using a precisely timed optical loop and quantum non-demolition measurements. We also discuss the influence of imperfect optical components.
On Sauer''s theory and practice in cultural ecology


地理研究 , 2003,
Abstract: “伯克利学派” ,又称“文化生态学派” ,是一个由卡尔·苏尔创立的、具有广泛学术影响的美国人文地理学派 ,在欧美地理学界和文化人类学界曾产生过巨大影响。本文对伯克利学派创始人卡尔·苏尔的学术思想和学术实践作了系统的分析和总结。苏尔的学术研究主要包括五个部分 :1 )农业起源问题研究 ;2 )文化景观与生态环境相互关系的研究 ;3)美洲探险史和发现史研究 ;4 )人类对自然环境的改造 ;5 )文化生态学方法论探索。指导苏尔学术实践活动的核心思想 ,是他在《景观的形态》和《历史地理学序言》中系统阐述和倡导的文化生态学思想 ,这就是强调文化景观与生态环境之间有机联系的分析 ,重视文化景观的发生学或历史地理学的研究

Deng Hui,

第四纪研究 , 1998,
Abstract: The North Yanshan Mountains Region lies in the eastern part of the .InnerMongolia Autonomous Region. From 916 A. D. to 1125 A. D., Qidan nationalityconquered this region and founded their minority reign. The objective of this paperis to reconstruct the climatic series during the Liao Dynasty.At first, according to the Liao Dynasty Historical Book and the Travels ofthose messagers coming from the Northern Song Dynasty, the author gathered all ofthe records of drought flood, and the extreme low temperature. Then based on thedamagement of droughts and floods, the dry / wet series of the research region isexpressed by four grades: drier, the driest the wettest wetter, which are denotedby the numbers 1, 2, 4, 5 respectively. The reconstructed regional dry / wet series isfrom 928 A.D. to 1109 A.D., total of 182 years. The following conclusions weresuggested:(1)From 920 A.D. to 979 A.D., there were more drought records, the climatewas drier. It was the driest during 930' s, 960' s, and 970' s.(2)From 980 A.D. to 1029 A.D., the amount of floods had increased obviously,the climate was wetter. It was wettest during 990' s, 1010' s.(3)From 1030 A.D. to 1079 A.D., both records of drought and flood were less.The climate was nomoral and had a little change.(4)From 1080 A.D. to 1109 A.D., the amount of floods had increased again.The climate became wetter again and was wetter than the period from 980 A.D. to1029 A.D.(5)About from 1080 A.D., the temperature had dropped rapidly. This abruptchange happened 30 years earlier than the region of the North China.
Theory of Ideal Four-Wave Mixing in Bose-Einstein Condensates
Wenji Deng,P. M. Hui
Physics , 2000,
Abstract: Starting from a second-quantized Hamiltonian of many-particle systems, we derive the Gross-Pitaevskii (GP) equation in momentum space, which is suitable for studying the multi-wave mixing processes of coherent matter waves. The coupling equations are then applied to study ideal four-wave mixing (4WM), in which only four waves with definite wavevectors are involved. Some interesting problems of 4WM, such as the phase-matching condition, the collapse and revival behaviour, the effects of relative phase difference, and the conversion efficiency are discussed in detail. We also show that the main characters of recent 4WM experiment [Deng et al, Nature 398, 218 (1999)] can be undersood in the present simplified model.
Permutation symmetry and magic numbers of few-electron systems
Wenji Deng,P. M. Hui
Physics , 1997,
Abstract: This paper has been withdrawn by Wenji Deng (e-mail: phwjdeng@scut.edu.cn) for further modification at Oct. 12, 1998. {PACS: 03.75.Fi, 05.30.Jp.64.60.-i, 32.80.Pj}
Bose-Einstein condensation of finite number of confined particles
Wenji Deng,P. M. Hui
Physics , 1997, DOI: 10.1016/S0038-1098(97)10030-8
Abstract: The partition function and specific heat of a system consisting of a finite number of bosons confined in an external potential are calculated in canonical ensemble. Using the grand partition function as the generating function of the partition function, an iterative scheme is established for the calculation of the partition function of system with an arbitrary number of particles. The scheme is applied to finite number of bosons confined in isotropic and anisotropic parabolic traps and in rigid boxes. The specific heat as a function of temperature is studied in detail for different number of particles, different degrees of anisotropy, and different spatial dimensions. The cusp in the specific heat is taken as an indication of Bose-Einstein condensation (BEC).It is found that the results corresponding to a large number of particles are approached quite rapidly as the number of bosons in the system increases. For large number of particles, results obtained within our iterative scheme are consistent with those of the semiclassical theory of BEC in an external potential based on the grand canonical treatment.
Effects of planting dates, densities, and varieties on ecophysiology of pigeonpea in the Southeastern United States  [PDF]
Corie Wilson, Dafeng Hui, Emeka Nwaneri, Jun Wang, Qi Deng, Desh Duseja, Fisseha Tegegne
Agricultural Sciences (AS) , 2012, DOI: 10.4236/as.2012.32017
Abstract: Pigeonpea [Cajanus cajan (L.) Millsp.] is an important legume crop widely cultivated in tropical and subtropical climates of the world. Interest in this crop is growing in many countries because of its multiple uses as a source of food, feed, fuel, and fertilizer. However, the performance of pigeonpea in Southeastern US has not been well investigated. We conducted an experiment in Nashville, Tennessee to test the effects of two planting dates, three densities, and four varieties on pigeonpea ecophysiology that included leaf photosynthesis, stomatal conductance, transpiration, water use efficiency (WUE), leaf area index (LAI) and soil respiration. Results indicated that the plants in the late planting plots had higher photosynthetic rate, stomatal conductance and transpiration. There were significant differences in the levels of leaf photosynthesis, stomatal conductance, transpiration, WUE and LAI among all four varieties. W3 and G1 showed higher photosynthetic rate and LAI than W1, and W3 had higher WUE than G2 and W1. Planting densities had no significant effect on all variables studied. This study indicated that late planting of variety G1 or W3 resulted in higher WUE and yield, but did no significant influence soil CO2 emission.
Trastuzumab-Doxorubicin Conjugate Provides Enhanced Anti-Cancer Potency and Reduced Cardiotoxicity  [PDF]
Ningyan Zhang, Melvin E. Klegerman, Hui Deng, Yun Shi, Eva Golunski, Zhiqiang An
Journal of Cancer Therapy (JCT) , 2013, DOI: 10.4236/jct.2013.41038

Since trastuzumab monotherapy for treatment of breast cancer with HER2/ErbB2 over-expression has been shown to have limited efficacy, combined treatment of trastuzumab with chemotherapy is widely practiced in clinic. However, certain combination treatments of trastuzumab and chemotherapy (i.e. doxorubicin) are not recommended due to high risk of cardiotoxicity. Antibody-drug conjugates (ADCs) offer selective delivery of cytotoxic agents into targeted cancer cells, thereby allowing for reduced general cellular cytotoxicity caused by chemotherapeutic agents through antibody mediated specific recognition of tumor antigens. In this study, we constructed a trastuzumab-doxorubicin conjugate (T-Dox) using a thioether linkage and characterized both biophysical stability and anti-cancer potency of the T-Dox using a panel of HER2 expressing cancer cell lines. The T-Dox conjugate showed significantly improved anti-cancer potency in comparison with trastuzumab. The results demonstrated for the first time that there were significant differences in the uptake of T-Dox among high HER2 expression cancer cells and higher T-Dox uptake also showed stronger anti-cancer potency. Similar to trastuzumab, T-Dox selectively bound to HER2 overexpressing cancer cells and low HER2 expression cells had no detectable uptake of T-Dox. Consistent to the uptake data, human cardiomyocyte cells had no detectable HER2 expression and T-Dox showed minimal cytotoxic effects. On the contrary, a treatment with combination of trastuzumab and doxorubicin showed severe cytotoxicity to human cardiomyocytes (>90% cell death after 3 day exposure). This study demonstrated that trastuzumab conjugated with doxorubicin (T-Dox) can provide valuable alternative to the combination treatment with doxorubicin and trastuzumab for high HER2 expressing cancer patients.

In-Field Management Practices for Mitigating Soil CO2 and CH4 Fluxes under Corn (Zea mays) Production System in Middle Tennessee  [PDF]
Sam Dennis, Qi Deng, Dafeng Hui, Junming Wang, Stephen Iwuozo, Chih-Li Yu, Chandra Reddy
American Journal of Climate Change (AJCC) , 2015, DOI: 10.4236/ajcc.2015.44029
Abstract: The United States continues to be the largest corn producer in the world. How to maximize corn yield and at the same time reduce greenhouse gas emissions, is becoming a challenging effort for growers and researchers. As a result, our understanding of the responses of soil CO2 and CH4 fluxes to agricultural practices in cornfields is still limited. We conducted a 3-yr cornfield experiment to study the responses of soil CO2 and CH4 fluxes to various agricultural practices in middle Tennessee. The agricultural practices included no-tillage + regular applications of urea ammonium nitrate (NT-URAN); no-tillage + regular applications of URAN + denitrification inhibitor (NT-inhi- bitor); no-tillage + regular applications of URAN + biochar (NT-biochar); no-tillage + 20% applications of URAN + chicken litter (NT-litter); no-tillage + split applications of URAN (NT-split); and conventional tillage + regular applications of URAN as a control (CT-URAN). A randomized complete block design was used with six replications. The same amount of fertilizer equivalent to 217 kg·N·ha-1 was applied to all of the experimental plots. The results showed that improved fertilizer and soil management, except the NT-biochar treatment significantly increased soil CO2 flux as compared to the conventional tillage (CT-URAN, 487.05 mg CO2 m-2·h-1). Soil CO2 flux increased exponentially with soil temperature (T < 30°C), and linearly with soil moisture (T ≥ 30°C) in all treatments. Across all treatments, soil CO2 flux tended to be positively related to corn yield and/or soil moisture. Soil CH4 flux increased linearly with soil moisture in all treatments. Improved fertilizer and soil management did not alter soil CH4 flux, but significantly affected its moisture sensitivity. Our results indicated that agricultural practices enhancing corn yield may also result in a net increase in carbon emissions from soil, hence reducing the potential of carbon sequestration in croplands.
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