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Search Results: 1 - 10 of 110583 matches for " CHEN Xiao-Xuan "
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The Market Reaction To Stock Splits Used as Dividends  [PDF]
Yang Xiao-Xuan
Technology and Investment (TI) , 2013, DOI: 10.4236/ti.2013.41B009
Abstract: This paper investigates the market reaction to stock splits based on China’s A share companies between 2007 to 2010. I find significant positive abnormal returns around the announcement date (especially before the announcement date) as well as four to six days before the execution date of China stock splits. I also observe significant negative abnormal returns just around the execution date. The above phenomenon is relatively stable even if the selection of samples and empirical models may vary, but the degree of this phenomenon might change overtime. The cross sectional regression of the abnormal returns for the announcement date shows that the phenomenon is sensitive to the split ratio and the market, and it is not sensitive to industry, company size and cash dividends. Therefore, combining with the empirical data i have constructed a high Sharpe ratio short selling investment strategy around the execution date. Then, the article further discusses the operability of the investment strategy and its stability over time.
Studies on defect structures of Mn2+ and Fe3+ impurity centers in ZnO crystals

Dong Hui-Ning,Wu Xiao-Xuan,Wu Shao-Yi,Zheng Wen-Chen,

物理学报 , 2002,
Abstract: 用建立在强场图像和自旋轨道耦合机理的高阶微扰公式研究了ZnO晶体中Mn2+和Fe3+杂质中心的零场分裂.研究发现:Mn2+和Fe3+离子不能占据准确的Zn2+位置,而是沿c3轴方向各自位移一段距离ΔR.这些位移及与此相关的缺陷结构也为Newman叠加模型所证实
Isolation and identification of the causative agent and histopathology observation of white-spots disease in internal organs of Larimichthys crocea
大黄鱼(Larimichthys crocea)内脏白点病的病原分离和组织病理学观察

QIU Yang-Yu,ZHENG Lei,MAO Zhi-Juan,CHEN Xiao-Xuan,

微生物学通报 , 2012,
Abstract: Objective] In order to find the pathogenic bacteria of white-spots disease in internal organs of Larimichthys crocea. Methods] Using the method of isolation and identification of the causative agent in combination with 16S rRNA sequencing to find the pathogenic bacteria.Besides it was determined by artificial infection. The tissue of diceased fish were pathologically analyzed by paraffin histological section techniques. Results] The bacterium Pseudomonas putida was responsible for the disease. Affected fish showed obvious inflammation and cell deformation or disintegration of the liver, kidney and spleen. Conclusion] The conducted study was necessary in order to reveal the reason for the high mortality of cultured yellow croaker in the Xiangshan bay. Furthermore, the results of this study can help to early recognize such disease outbreaks, hence preventing drastic economic losses in the future.
Evaluation of agricultural non-point source pollution and countermeasures in Shuikou Reservoir Drainage Area

HUANG Dong-Feng,LI Wei-Hu,QIU Xiao-Xuan,CHEN Chao,
,李卫华,邱孝煊,陈 超

中国生态农业学报 , 2008,
Abstract: Agricultural non-point sources pollution (including living contaminants, human feces and urine, rural solid trash and living rubbish, chemical fertilizer, livestock and bird aquatics, farm nutrient loss, surface runoff from villages and small towns, aquiculture, etc.) in 18 townships in Shuikou Reservoir Drainage Area were surveyed and evaluated by equivalent standard discharge amount method. The results show that the total discharge of CODcr, TN and TP are 6 288.87 ton, 4 450.07 ton and 1 448.82 ton respectively, with a total equivalent standard discharge of 1.936×1010m3. The pollution rate index of CODcr, TN and TP is 2.17%, 22.99% and 74.85%, respectively. Therefore, N and P are the primary contaminants in the drainage area. Furthermore, the largest three pollution rate indexes for the pollution sources are farm nutrient loss, aquiculture, livestock and bird feces & urine, with percentages of 41.95%, 36.81% and 10.60% respectively. The cumulative pollution rate index of the three pollution sources is 89.36%, hence they constitute the primary pollution sources in the area. Among the 18 villages and townships surveyed, the total equivalent standard discharge of Huangtian in 2005 is 2.942×109m3, with a pollution rate index of 15.20%, the largest in the basin. Those of Shuikou and Dongqiao are the second and third, in that order. The results also indicate that different villages and townships have different primary pollution sources. For example, living sewage is the leading pollution source in Huangdun and Shuidong, livestock and bird feces & urine is the leading one in Luxia and Dahuang, farm nutrient loss in Meixi and Dongqiao, and aquiculture leads the rating for Shuikou and Youxikou. Therefore, different villages and townships should take varying measures to address agricultural non-point source pollution. Finally, advanced prevention, remediation and other countermeasures to agricultural non-point source pollution in Shuikou Reservoir Drainage Area include improving agricultural legislation and intensifying management measures, strengthening research and technology devoted primarily to agricultural chemical substances, developing all-purpose and comprehensive use of dejecta of livestock and birds, developing ecological and organic agriculture, advocating cleansing production and enhancing rational application of fish feed and medication to reduce losses.
Magnetic anomaly characteristics out of reinforcement cage in cast-in-situ pile

DONG Ping,FAN Jing-liang,LIU Zhao-hui,CHEN Guang-wei,WANG Liang-shu,SUN Bin,PU Xiao-xuan,

地球物理学进展 , 2007,
Abstract: Steel bars in cast-in-situ pile will be magnetized under the excitation of geomagnetic field,which changes the magnetic field around pile.Based on the magnetic anomaly characteristics out of a horizontal cylinder and the results of model piles test,the magnetic anomaly characteristics out of reinforcement cage in cast-in-situ pile were analyzed.The analysis results indicate that the magnetic anomaly curve along the borehole depth out of reinforcement cage has a form of 'a valley between two peaks',on which a wide negative anomaly region like a saddle corresponds to the middle part of reinforcement cage and an inflexion from minimum to maximum corresponds to the bottom of reinforcement cage.It provides a basis for the length detection of reinforcement cage in cast-in-situ pile.
A Drug Screening Method Based on the Autophagy Pathway and Studies of the Mechanism of Evodiamine against Influenza A Virus
Jian-Ping Dai, Wei-Zhong Li, Xiang-Feng Zhao, Ge-Fei Wang, Jia-Cai Yang, Lin Zhang, Xiao-Xuan Chen, Yan-Xuan Xu, Kang-Sheng Li
PLOS ONE , 2012, DOI: 10.1371/journal.pone.0042706
Abstract: In this research, we have established a drug screening method based on the autophagy signal pathway using the bimolecular fluorescence complementation - fluorescence resonance energy transfer (BiFC-FRET) technique to develop novel anti-influenza A virus (IAV) drugs. We selected Evodia rutaecarpa Benth out of 83 examples of traditional Chinese medicine and explored the mechanisms of evodiamine, the major active component of Evodia rutaecarpa Benth, on anti-IAV activity. Our results showed that evodiamine could significantly inhibit IAV replication, as determined by a plaque inhibition assay, an IAV vRNA promoter luciferase reporter assay and the Sulforhodamine B method using cytopathic effect (CPE) reduction. Additionally, evodiamine could significantly inhibit the accumulation of LC3-II and p62, and the dot-like aggregation of EGFP-LC3. This compound also inhibited the formation of the Atg5-Atg12/Atg16 heterotrimer, the expressions of Atg5, Atg7 and Atg12, and the cytokine release of TNF-α, IL-1β, IL-6 and IL-8 after IAV infection. Evodiamine inhibited IAV-induced autophagy was also dependent on its action on the AMPK/TSC2/mTOR signal pathway. In conclusion, we have established a new drug screening method, and selected evodiamine as a promising anti-IAV compound.
Heterologous SH3-p85β inhibits influenza A virus replication
Dan-gui Zhang, Wei-zhong Li, Ge-fei Wang, Yun Su, Jun Zeng, Chi Zhang, Xiang-xing Zeng, Xiao-xuan Chen, Yan-xuan Xu, Kang-sheng Li
Virology Journal , 2010, DOI: 10.1186/1743-422x-7-170
Abstract: Influenza A viruses are globally important human and animal respiratory pathogens, and viral infections cause highly contagious respiratory diseases. Influenza A virus can be divided into numerous subtypes (H1~H16 and N1~N9) according to the antigenicity of hemagglutinin (HA) and neuraminidase (NA). Among them, H1N1 and H3N2 subtypes are the most common subtype in human influenza infections [1]. However, in some situations, several avian influenza virus subtypes (such as H5N1, H7N7, or H9N2) can break through the species barrier and be transmitted to humans [2]. These avian influenza viruses have posed serious threat to public health.One of the main research emphases in the influenza A virus is its NS1 protein. NS1 can modulate virus infection and host cell signalling pathway [3-6], such as phosphatidylinositol 3-kinase(PI3K)/Akt pathway [7]. The PI3K/Akt pathway plays a central role in modulating diverse downstream signalling pathways associated with cell survival, proliferation, migration, and differentiation [8-10].PI3K is a dimeric enzyme consisting of a p110 catalytic subunit (α, β, or δ) tethered to a smaller, non-catalytic, regulatory subunit p85 (usually p85α, p85β, p55γ, p55α, or p50α) [11-13]. NS1 can interact with p85β of PI3K via direct binding to SH3 domain of p85β and hence promote the activation of PI3K [14], whereas mutation within the SH3 binding motif 1 of NS1 is able to deprive NS1-p85β interaction and result in the reduction of virulence of influenza A virus [15]. Apart from SH3, iSH2 domain (inter-SH2) and cSH2 domain (C-terminal SH2) domain of p85β are responsible for NS1-p85β interaction and the subsequent activation of PI3K [14,16,17]. NS1-mediated PI3K activation is obviously essential for influenza A virus replication because viral titers are significantly decreased when PI3K is inhibited [18,19].We hypothesized that viral replication could be repressed by blocking NS1-p85β interaction (competitively) with heterologously expressed SH3. Sinc
Variation of functional bacteria during start-up and operation of partial nitrification process

CHEN Xiao-Xuan,LIU Chun,YANG Jing-Liang,ZHANG Run,YANG Hui-Na,

微生物学通报 , 2012,
Abstract: Objective] Partial nitrification-anammox is considered as the shortest?process for biological nitrogen removal and partial nitrification is the important part of this process. Methods] The variation of functional bacteria during start-up and stable operation of partial nitrification process was investigated in a SBR bioreactor in this study. Results] The results indicated that ammonia-oxidizing bacteria (AOB) population was expanded significantly and nitrite-oxidizing bacteria (NOB) population was inhibited when DO concentration was controlled lower than 1 mg/L and ammonia loading of the influent increased gradually. As a result, start-up and stable operation of partial nitrification process was realized. When ammonia volumetric loading of the influent was 0.055 kg/(m3·d), the average ammonia removal volumetric loading and sludge loading were 0.043 kg/(m3·d) and 0.16?kg/(kg·d), respectively. In addition, the average nitrite accumulation rate was 83.4% at this time. AOB population density and relative abundance increased from 4.5×104 CFU/mL to 1.5×107CFU/mL and from 0.18% to 7.25%, respectively, during start-up and stable operation of partial nitrification process. At the same time, NOB population density and relative abundance decreased from 2.0×105 CFU/mL to 1.5×104 CFU/mL?and from 5.51% to 2.14%, respectively. Conclusion] The expansion of AOB population was responsible for realization of partial nitrification and ammonia removal. High ammonia concentration and loading?also caused the activity inhibition of partial nitrification.
Effects of dietary xylo-oligosaccharide on intestinal microflora of grass carp (Ctenopharyngodon idellus)

XIONG Juan,WU Zhi-Xin,ZHANG Peng,QU Yi,FU Si-Si,LIU Jia-Jia,CHEN Xiao-Xuan,

微生物学通报 , 2011,
Abstract: Intestinal microflora of grass carp (Ctenopharyngodon idellus) feeding with xylo-oligosaccharide for 56 days by concentrations of 0.1%, 0.2%, 0.4% and 0.6% respectively was investigated in this paper. Numbers of E. coli, Aeromonas and Bifidobacterium were analyzed before feeding and after 14, 28, 42, 56 days. The results showed that there was a certain influence on the intestinal microflora of grass carp after fed with different concentrations of xylo-oligosaccharides. The quantity of E. coli in the intestine of grass carps was smallest on 28th day, and compared with the control group, 0.4% group significantly different (P<0.05) has the highest decreasing magnitudes. The quantity of Aeromonas reduced but there was no significant difference with control. The quantity of Bifidobacterium increased and there was significant difference (P<0.05) between control and 0.4% group on 14th day. Therefore, feedstuffs with xylo-oligosaccharide, which were conducive to maintain a healthy state of intestinal microflora, group with 0.4% has the best effect.
CAS-based Modeling and Simulation of Water Rights Trading

WANG Hui-min,TONG Jin-ping,LIN Chen,LIU Yin,ZHANG Xiao-xuan,
,佟金萍,林 晨,刘 银,张晓璇

系统工程理论与实践 , 2007,
Abstract: Transition of water rights is a vital means to water resources optimization allocation.It is an effective way to allocate water resources by market mechanism.In order to verify the idea,based on complex adaptive system(CAS)theory,modeling of water rights trading was built,and simulation parameters were designed.On the platform of SWARM,simulations were performed to verify the rationality of the theoretical framework.The conclusion suggests that the introduction of market mechanism is effective to water resource allocation and raising unit benefit of water using and efficiency and satisfaction of government,etc.
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