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Search Results: 1 - 10 of 97892 matches for " HUANG Guang-yu "
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HUANG Guang-yu,CAI Yun-long,

资源科学 , 2002,
Abstract: Induced by the cultivated land resources decrease and degradation, there exit severe conflicts among population, cultivated land and food supply in Fujian Province. The main concerns of this paper are devoted to the contribution of the cultivated land to food productivity at different periods, and to the negative effects of cultivated land degradation on the potential increase of grain yield per hectare. Degradation of cultivated land, due to the soil erosion and pollution, tends to transform the high-yield land to the mid-yield and low-yield one, which will further restrict the food production and can be conceived as the bottleneck of food security in China. Granted, we can meet the food security through grain importing. The fundamental methods to solve these problems, however, are not only to maintain quantitative balance of cultivated land and to prevent the land from degradation, but also to exploit other food resources in non-cropland and to advance the comprehensive productivity of land resources.
Anomalous Hall effect and current spin polarization in Co$_2$FeX (X = Al, Ga, In, Si, Ge, and Sn) Heusler compounds: A systematic {\it ab initio} study
Hung-Lung Huang,Jen-Chuan Tung,Guang-Yu Guo
Physics , 2015, DOI: 10.1103/PhysRevB.91.134409
Abstract: In this paper, we perform a systematic {\it ab initio} study of two principal spin-related phenomena, namely, anomalous Hall effect and current spin polarization, in Co$_2$Fe-based Heusler compounds Co$_2$FeX (X = Al, Ga, In, Si, Ge, Sn) within the generalized gradient approximation (GGA). The accurate full-potential linearized augmented plane-wave method is used. We find that the spin-polarization of the longitudinal current ($P^L$) in Co$_2$FeX (X = Al, Ga, In, Al$_{0.5}$Si$_{0.5}$ and Sn) is $\sim$100 \% even though that of the electronic states at the Fermi level ($P^D$) is not. Further, the other compounds also have a high current spin polarization with $P^L > 85$ \%. This indicates that all the Co$_2$FeX compounds considered are promising for spin-transport devices. Interestingly, $P^D$ is negative in Co$_2$FeX (X = Si, Ge and Sn), differing in sign from the $P^L$ as well as that from the transport experiments. Secondly, the calculated anomalous Hall conductivities (AHCs) are moderate, being within 200 S/cm, and agree well with the available experiments on highly L2$_1$ ordered Co$_2$FeSi specimen although they differ significantly from the reported experiments on other compounds where the B2 antisite disorders were present. Surprisingly, the AHC in Co$_2$FeSi decreases and then changes sign when Si is replaced by Ge and finally by Sn. Third, the calculated total magnetic moments agree well with the corresponding experimental ones in all the studied compounds except Co$_2$FeSi where a difference of 0.3 $\mu_B$/f.u. exists. We also perform the GGA plus on-site Coulomb interaction $U$ calculations in the GGA+$U$ scheme. We find that including the $U$ affects the calculated total magnetic moment, spin polarization and AHC significantly, and in most cases, results in a disagreement with the available experimental results.
Ultrafast solvation dynamics at internal site of staphylococcal nuclease investigated by site-directed mutagenesis
Gao Guang-yu,Li Yu,Wang Wei,Wang Shu-feng,Dongping Zhong,Gong Qi-huang
Quantitative Biology , 2014, DOI: 10.1088/1674-1056/24/1/018201
Abstract: Solvation is essential for protein activities. To study internal solvation of protein, site-directed mutagenesis is applied. Intrinsic fluorescent probe, tryptophan, is inserted into desired position inside protein molecule for ultrafast spectroscopic study. Here we review this unique method for protein dynamics researches. We introduce the frontiers of protein solvation, site-directed mutagenesis, protein stability and characteristics, and the spectroscopic methods. Then we present time-resolved spectroscopic dynamics of solvation dynamics inside caves of active sites. The studies are carried out on a globular protein, staphylococcal nuclease. The solvation at internal sites of the caves indicate clear characteristics of local environment. These solvation behaviors correlated to the enzyme activity directly.
Removal of organic matter and nitrogen from distillery wastewater by a combination of methane fermentation and denitrification/nitrification processes
LI Jun,ZHANG Zhen-ji,LI Zhi-rong,HUANG Guang-yu,Naoki Abe,
LI Jun
,ZHANG Zhen-ji,LI Zhi-rong,HUANG Guang-yu,Naoki Abe

环境科学学报(英文版) , 2006,
Abstract: The distillery wastewater of Guangdong Jiujiang Distillery, which is characteristic of containing high organic matters and rich total nitrogen, was treated by a combination of methane fermentation and denitrification/nitrification processes. 80% of COD in the raw wastewater was removed by methane fermentation at the COD volumetric loading rate of 20 kg COD/(m3 x d) using the expanded granule sludge bed (EGSB) process. However, almost all the organic nitrogen in the raw wastewater was converted into ammonia by ammonification there. Ammonia and volatile fatty acids (VFA) remaining in the anaerobically treated wastewater were simultaneously removed utilizing VFA as an electron donor by denitrification occurring in the other EGSB reactor and nitrification using PEG-immobilized nitrifying bacteria with recirculation process. An aerobic biological contact oxidization reactor was designed between denitrification/nitrification reactor for further COD removal. With the above treatment system, 18000-28000 mg/L of COD in raw wastewater was reduced to less than 100 mg/L. Also, ammonia in the effluent of the system was not detected and the system had a high removal rate for 900-1200 mg/L of TN in the raw wastewater, only leaving 400 mg/L of nitrate nitrogen.
Small Interfering RNA Targeting M2 Gene Induces Effective and Long Term Inhibition of Influenza A Virus Replication
Hong-Yan Sui, Guang-Yu Zhao, Jian-Dong Huang, Dong-Yan Jin, Kwok-Yung Yuen, Bo-Jian Zheng
PLOS ONE , 2009, DOI: 10.1371/journal.pone.0005671
Abstract: RNA interference (RNAi) provides a powerful new means to inhibit viral infection specifically. However, the selection of siRNA-resistant viruses is a major concern in the use of RNAi as antiviral therapeutics. In this study, we conducted a lentiviral vector with a H1-short hairpin RNA (shRNA) expression cassette to deliver small interfering RNAs (siRNAs) into mammalian cells. Using this vector that also expresses enhanced green fluorescence protein (EGFP) as surrogate marker, stable shRNA-expressing cell lines were successfully established and the inhibition efficiencies of rationally designed siRNAs targeting to conserved regions of influenza A virus genome were assessed. The results showed that a siRNA targeting influenza M2 gene (siM2) potently inhibited viral replication. The siM2 was not only effective for H1N1 virus but also for highly pathogenic avian influenza virus H5N1. In addition to its M2 inhibition, the siM2 also inhibited NP mRNA accumulation and protein expression. A long term inhibition effect of the siM2 was demonstrated and the emergence of siRNA-resistant mutants in influenza quasispecies was not observed. Taken together, our study suggested that M2 gene might be an optimal RNAi target for antiviral therapy. These findings provide useful information for the development of RNAi-based prophylaxis and therapy for human influenza virus infection.
Does PGA external stenting reduce compliance mismatch in venous grafts?
Zhong-zhao Teng, Guang-yu Ji, Hong-jun Chu, Zhi-Yong Li, Liang-jian Zou, Zhi-yun Xu, Sheng-dong Huang
BioMedical Engineering OnLine , 2007, DOI: 10.1186/1475-925x-6-12
Abstract: In this study, the jugular veins taken from hypercholesterolemic rabbits were transplanted into the carotid arteries, and non-woven polyglycolic acid (PGA) fabric was used to fabricate the external stents to study the effect of the biodegradable external stent. Eight weeks after the operation, the grafts were harvested to perform mechanical tests and histological examinations. An arc tangent function was suggested to describe the relationship between pressure and cross-sectional area to analyse the compliance of the graft.The results from the mechanical tests indicated that grafts either with or without external stents displayed large compliance in the low-pressure range and were almost inextensible in the high-pressure range. This was very different from the behavior of the arteries or veins in vivo. The data from histological tests showed that, with external stents, collagen fibers were more compact, whilst those in the graft without protection were looser and thicker. No elastic fiber was found in either kind of grafts. Furthermore, grafts without protection were over-expanded which resulted in much bigger cross-sectional areas.The PGA external extent contributes little to the reduction of the mechanical mismatch between the graft and its host artery while remodeling develops. For the geometric mismatch, it reduces the cross-section area, therefore matching with the host artery much better. Although there are some positive effects, conclusively the PGA is not an ideal material for external stent.Autogenous vein grafting is widely used in regular bypassing procedures in the treatment of ischemia due to occlusive vascular lesions, such as atherosclerosis. However its patency is limited by progressive intima hyperplasia, which causes serious clinical problems, needing repeated angioplasty and graft surgery. Extensive studies have been carried out for capturing the mechanisms of restenosis. Currently the mechanical property/compliance and geometric mismatches are reg
Tumor characteristics and the clinical outcome of invasive lobular carcinoma compared to infiltrating ductal carcinoma in a Chinese population
A-Yong Cao, Liang Huang, Jiong Wu, Jin-Song Lu, Guang-Yu Liu, Zhen-Zhou Shen, Zhi-Ming Shao, Gen-Hong Di
World Journal of Surgical Oncology , 2012, DOI: 10.1186/1477-7819-10-152
Abstract: Clinicopathologic features, overall survival (OS), and recurrence/metastasis-free survival (RFS) were compared between 2,202 patients with IDC and 215 patients with ILC.ILC was significantly more likely to be associated with a favorable phenotype, but the incidence of contralateral breast cancer was higher for ILC patients than for IDC patients (8.4% vs. 3.9%; P =0.001). The frequencies of recurrence/metastasis (P?=?0.980) and death (P?=?0.064) were similar among patients with IDC and patients with ILC after adjustment for tumor size and nodal status. The median follow-up was 42.8 months.Chinese women with ILCs do not have better clinical outcomes than their counterparts with IDC. Management decisions should be based on individual patient and tumor biologic characteristics, and not on lobular histology.
Hybrid Methods for Reliability Analysis of Phased-Mission Systems

CHEN Guang-yu,HUANG Xi-zi,TANG Xiao-wo,

系统工程理论与实践 , 2005,
Abstract: Two different kinds of approaches for the reliability analysis of phased-mission systems are introduced, which include binary decision diagram for phased-mission systems (PMS-BDD) combinational methods and Markov chain methods. If each phase of PMS is actually static, the combinational methods are better than Markov chain methods. But if some phases are dynamic and others are static, there is a problem whether Markov chain methods or the hybrid methods with combinational methods and Markov chain methods are better. After characteristics of components across phases and that of hybrid methods are researched, and if survival function of the components across the phases is exponentially distributed and the several special terms are matched, then the simple algorithm is presented for the hybrid methods. This algorithm implements a synthesis of the approaches into a single methodology which advantages of the low computational complexity and easy implementation are shown using an example.
Integrated Analysis of Phased-Mission System Reliability with Imperfect Coverage

CHEN Guang-yu,HUANG Xi-zi,TANG Xiao-wo,

系统工程理论与实践 , 2006,
Abstract: Accounting for reliability analysis of phased-mission systems,a new modularization technique is presented.Further considering imperfect coverage,a new algorithm incorporates static IGPMS-CPR approach and a dynamic method integrating imperfect coverage model with Markov chain.After special dependencies from static subsystems to dynamic subsystems are researched,the algorithm based and easy solution is obtained.The solution implements a synthesis of the approaches into a single methodology which advantages of the low computational complexity and easy implementation are showed using an example.
Tuning linear and nonlinear optical properties of wurtzite GaN by c-axial stress
Duanjun Cai,Guang-Yu Guo
Physics , 2009, DOI: 10.1088/0022-3727/42/18/185107
Abstract: We study the linear and nonlinear optical properties of wurtzite GaN under c-axial stress field, using density functional theory calculations. The fully structural optimization at each c-axial strain was performed. The calculated dielectric functions show that tensile c-axial strain effectively improves the linear optical efficiency, especially for the band-edge transitions, and significantly increase the mobility of electrons in the conduction band. Second-order nonlinear optical susceptibilities show that the tensile c-axial strain will enhance the zero- and low-frequency nonlinear responses of GaN. The enhancement of the nonlinear optical property is explained by the reduction of the polarization of wurtzite GaN under tensile c-axial strains. Based on these findings, we propose a method for improving the electrical and optical properties of the crystal through imposing appropriate stress on the high symmetry crystalline directions.
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