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Search Results: 1 - 10 of 52179 matches for " Yong-Qiang Song "
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Particle swarm collaborative optimization algorithm based on velocity angle
基于速度夹角的粒子群协同优化算法

SONG Yong-qiang,XIA Bo-kai,
宋永强
,夏伯锴

计算机应用 , 2007,
Abstract: Particle swarm optimization (PSO) algorithm is a stochastic global optimization technique, and it has been successfully applied in many areas. Concerning the disadvantage of the original PSO that is easily trapped in the local optimization and the convergence speed is slow in the evolution later, a particle swarm collaborative optimization algorithm based on velocity angle (V-PSCO) was proposed. The strategy of inertia weight adjustment was adopted based on cumulative distribution function of Gaussian distribution. V-PSCO was used to resolve several widely used test function optimization problems. Results show that V-PSCO has better ability of global search and can effectively improve the performance.
Distribution of ghrelin-like immunoreactive cells in amphioxus, Branchiostoma belcheri – A study of immunohistochemistry
You-Zhu Weng,Hai-Xia Song,Yong-Qiang Fang
自然科学进展 , 2008,
Abstract: The distribution of ghrelin-like immunoreactive cells in amphioxus (Branchiostoma belcheri) was investigated by using immunohistochemical staining with rabbit antiserum against synthetical mammalian ghrelin. The results showed that ghrelin-like immunoreactive cells were distributed widely in the nervous system, Hatschek’s pit, wheel organ, digestive tract and gonads (ovary and testis). In nervous system, ghrelin-like immunoreactive neurons and their protrusions were distributed speci?cally on the dorsal side, ventral side and funnel part of brain vesicle, with a few dispersive immunoreactive nerve cells and their ?bers in nerve tube. Ghrelin-like immunoreactivities were also detected in Hatschek’s pit epithelial cells and wheel organ cells, with positive substance located along cell membrane. In digestive tract, ghrelin-like immunoreactive cells existed in hepatic diverticulum, anterior and posterior region of midgut, and could be classified into two types, closed- and opened-type endocrine cells. The number of positive cells was most in hepatic diverticulum, secondary in posterior region of midgut and least in anterior region of midgut. In gonads, ghrelin-like immunoreactive substance was detected in oogonia, oocytes and follicle cells in ovary at the small and large growth stages and in early spermatogenic cells and Sertoli cells in testis. The extensive distribution of ghrelin-like cells in amphioxus suggested that these kinds of cells are conservative in evolution and diversified in function. At the same time, we found for the ?rst time that ghrelin-like immunoreactive cells existed in brain vesicle and Hatschek’s pit, which provided new morphological evidence for the existence of an activation pathway between brain vesicle and Hatschek’s pit for the regulation of growth hormone excretion.
Electrical Transport Behavior and Magnetoresistance Properties of (1-x)La2/3Ca 1/3 MnO 3/xSb2O 5 Composites
YUAN Li,MIAO Ju-Hong,WANG Yong-Qiang,LIU Li,YUAN Song-Liu
无机材料学报 , 2007, DOI: 10.3724/sp.j.1077.2007.00319
Abstract: The composites with the nominal composition of (1-x)La2/3Ca 1/3 MnO 3/xSb2O 5 were fabricated. The study of temperature dependence of resistivity at zero field shows that the metal-insulator transition temperature (T p) and the resistivity of the composites are dependent on Sb2O5 addition level x. When x<3%, T p shifts towards low temperature and resistivity increases with the increase of x. But T p shifts towards high temperature and resistivity decreases with further increasing of x. The measurement for temperature dependence of magnetoresistance (MR) indicates that MR effect can be largely enhanced in the composites with small Sb2O5 addition.
Effect of melittin on apoptsis and necrosis of U2OS cells
CHEN Yong-Qiang
Zhong Xi Yi Jie He Xue Bao , 2004,
Abstract: Objective: To study the effect of melittin on apoptsis and necrosis of osteosarcoma cell line U2OS in vitro. Methods: Osteosarcoma cell line U2OS was treated with melittin. The growth and proliferation was observed by MTT assay and cell counting, and the necrosis was estimated by Trypan blue staining. The cell apoptsis, Fas and Apo2.7expression were detected by cytometer. Results: The data showed that melittin could inhibit the proliferation of U2OS dose-dependently at 16 and 64 mg/L. Cell apoptsis was detected by cytometer, when the cells were treated by 16 mg/L and 32 mg/L of melittin respectively, and the percentages of Fas and Apo2.7 positive cells were increased. Conclusion: Melittin inhibits the proliferation of osterosarcoma cell line through up-regulating Fas expression and inducing apoptsis.
Cost-Effective Strategy for the Investigation and Remediation of Polluted Soil Using Geostatistics and a Genetic Algorithm Approach  [PDF]
Yong-Qiang Cui, Minoru Yoneda, Yoko Shimada, Yasuto Matsui
Journal of Environmental Protection (JEP) , 2016, DOI: 10.4236/jep.2016.71010
Abstract: The geostatistical technique of Kriging has extensively been used for the investigation and delineation of soil heavy metal pollution. Kriging is rarely used in practical circumstances, however, because the parameter values are difficult to decide and relatively optimal locations for further sampling are difficult to find. In this study, we used large numbers of assumed actual polluted fields (AAPFs) randomly generated by unconditional simulation (US) to assess the adjusted total fee (ATF), an assessment standard developed for balancing the correct treatment rate (CTR) and total fee (TF), based on a traditional strategy of systematic (or uniform) grid sampling (SGS) and Kriging. We found that a strategy using both SGS and Kriging was more cost-effective than a strategy using only SGS. Next, we used a genetic algorithm (GA) approach to find optimal locations for the additional sampling. We found that the optimized locations for the additional sampling were at the joint districts of polluted areas and unpolluted areas, where abundant SGS data appeared near the threshold value. This strategy was less helpful, however, when the pollution of polluted fields showed no spatial correlation.
Transcriptional regulatory programs underlying barley germination and regulatory functions of Gibberellin and abscisic acid
Yong-Qiang An, Li Lin
BMC Plant Biology , 2011, DOI: 10.1186/1471-2229-11-105
Abstract: The studies examined transcriptomes of barley representing six distinct and well characterized germination stages and revealed that the transcriptional regulatory program underlying barley germination was composed of early, late, and post-germination phases. Each phase was accompanied with transcriptional up-regulation of distinct biological pathways. Cell wall synthesis and regulatory components including transcription factors, signaling and post-translational modification components were specifically and transiently up-regulated in early germination phase while histone families and many metabolic pathways were up-regulated in late germination phase. Photosynthesis and seed reserve mobilization pathways were up-regulated in post-germination phase. However, stress related pathways and seed storage proteins were suppressed through the entire course of germination. A set of genes were transiently up-regulated within three hours of imbibition, and might play roles in initiating biological pathways involved in seed germination. However, highly abundant transcripts in dry barley and Arabidopsis seeds were significantly conserved. Comparison with transcriptomes of barley aleurone in response to GA and ABA identified three sets of germination responsive genes that were regulated coordinately by GA, antagonistically by ABA, and coordinately by GA but antagonistically by ABA. Major CHO metabolism, cell wall degradation and protein degradation pathways were up-regulated by both GA and seed germination. Those genes and metabolic pathways are likely to be important parts of transcriptional regulatory networks underlying GA and ABA regulation of seed germination and seedling growth.The studies developed a model depicting transcriptional regulatory programs underlying barley germination and GA and ABA regulation of germination at gene, pathway and systems levels, and established a standard transcriptome reference for further integration with various -omics and biological data to
Melamine Nitrate: A Novel and Efficient Reagent for Regioselective Nitration of Phenols
Yong-qiang Chen,Hong Jiang
Organic Chemistry International , 2011, DOI: 10.1155/2011/753142
Abstract: Melamine nitrate (MN) as a novel nitration reagent was easily prepared. Regioselective nitration of phenols to their corresponding o-nitrophenols occurred using MN with p-toluenesulfonic acid as catalyst in good to excellent yields. A distinct advantage of this method is the easy separation of products by simple filtration. 1. Introduction Nitration of aromatic compounds is one of the most important and widely studied reactions and industrial processes. The typical nitration procedure requires use of mixed acids such as concentrated nitric acid and sulfuric acid. Nitrophenols are important intermediates for the manufacture of drugs and pharmaceuticals [1]. But phenols are highly reactive; therefore the nitration of phenols by mixed acids is always associated with the formation of dinitro compounds, oxidized products, and unspecified resinous materials. So a lot of mild nitration processes for phenols have been developed to overcome these shortcomings. Especially, in recent years, various nitrate salts for phenols have been reported [2–10]. However, some of the nitrating reagents are poorly regioselective and uneconomical. Considering these concerns, there is still a good scope for research towards finding economic, mild reagents for regioselective nitration of phenols. Melamine is a widely used fire retarder in polymers. The amino groups of melamine are stable to oxidation condition such as H2O2, in which it can form stable adduct with H2O2 [11, 12]. This inspired us to think that melamine may be stable in oxidative acid such as nitric acid. So in this paper we prepared the melamine nitric acid complex (MN) (Figure 1) and used it as nitration reagent. Figure 1 Herein we report this efficient and facile nitration procedure for phenols using MN (Scheme 1). The preparation of melaminium nitrate is simple by the direct reaction of melamine with nitric acid at room temperature. Scheme 1 2. Results and Discussions Table 1 summarized the results of nitration of phenol by MN in different solvents such as CCl4, CH2Cl2, and CHCl3; the highest yield of 2-nitrophenol was isolated in acetone (Table 1, entry 1). So in the following reactions, acetone was used as solvent. Different other catalytic acids like, acetic acid, benzoic acid, and sulfuric acid were also tested but they either gave trace product (in acetic acid or benzoic acid) or very complicated products (in sulfuric acid); so p-toluenesulfonic acid was chosen as catalytic acid. Table 1: Nitration of phenol with different solvents by MN. The results of nitration reactions of other phenolic compounds by
Numerical Simulations of Calcium Ions Spiral Wave in Single Cardiac Myocyte

BAI Yong-Qiang,ZHU Xing,

中国物理快报 , 2010,
Abstract: The calcium ions (Ca2+) spark is an elementary Ca2+ release event in cardiac myocytes. It is believed to buildup cell-wide Ca2+ signals, such as Ca2+ transient and Ca2+ wave, through a Ca2+-induced Ca2+ release (CICR) mechanism. Here the excitability of the Ca2+ wave in a single cardiac myocyte is simulated by employing the fire-diffuse-fire model. By modulating the dynamic parameters of Ca2+ release and re-uptake channels, we find three Ca2+ signaling states in a single cardiac myocyte: no wave, plane wave, and spiral wave. The period of a spiral wave is variable in the different regimes. This study indicates that the spiral wave or the excitability of the system can be controlled through micro-modulation in a living excitable medium.
Electrical Transport Behavior and Magnetoresistance Properties of (1-x)La2/3Ca 1/3 MnO 3/xSb2O 5 Composites
(1-x)La2/3Ca 1/3 MnO 3/xSb2O 5复合体系的电子输运和磁电阻行为

YUAN Li,MIAO Ju-Hong,WANG Yong-Qiang,LIU Li,YUAN Song-Liu,
袁 力
,缪菊红,王永强,刘 莉,袁松柳

无机材料学报 , 2007,
Abstract: The composites with the nominal composition of (1 - x)La2/3Ca1/3MnO3/xSb2O5 were fabricated. The study of temperature dependence of resistivity at zero field shows that the metal-insulator transition temperature (Tp) and the resistivity of the composites are dependent on Sb2O5 addition level x. When x <3%, Tp shifts towards low temperature and resistivity increases with the increase of x. But Tp shifts towards high temperature and resistivity decreases with further increasing of x. The measurement for temperature dependence of magnetoresistance (MR) indicates that MR effect can be largely enhanced in the composites with small Sb2O5 addition.
Preparation and Application of Magnetic Fe(OH)_3 Porous Microspheres in Treatment of Wastewater Containing Phosphorus
磁性多孔Fe(OH)3微球制备及其在含磷废水处理中的应用

SHI Zhong-liang,SONG Yong-qiang,GUO Xing,XIE Cai-yue,YAO Shu-hua,
石中亮
,宋永强,郭星,谢彩月,姚淑华

过程工程学报 , 2011,
Abstract: A composite adsorbent of magnetic Fe(OH)3 porous microspheres with Fe3O4 core was prepared,and characterized.The characteristics of phosphate adsorption on magnetic Fe(OH)3 porous microspheres were investigated.The influential factors such as the dosage of adsorbent,initial concentration of H2PO4-,solution pH value,co-existing anions in solution on removal of H2PO4-were examined.The adsorption isotherm of phosphate on porous microspheres could be described by Langmuir equation,and the adsorption kinetic dat...
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