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Search Results: 1 - 10 of 17807 matches for " XIONG Qiang "
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An Alternative Estimation for Functional Coefficient ARCH-M Model  [PDF]
Xingfa Zhang, Qiang Xiong
Theoretical Economics Letters (TEL) , 2016, DOI: 10.4236/tel.2016.64070
Abstract: This article provides an alternative approach to estimate the functional coefficient ARCH-M model given by Zhang, Wong and Li (2016) [1]. The new method has improvement in both computational and theoretical parts. It is found that the computation cost is saved and certain convergence rate for parameter estimation has been obtained.
A nonparametric CUSUM control chart based on the Mann-Whitney statistic
Dabuxilatu Wang,Qiang Xiong
Statistics , 2013,
Abstract: This article aims to consider a new univariate nonparametric cumulative sum (CUSUM) control chart for small shift of location based on both change-point model and Mann-Whitney statistic. Some comparisons on the performances of the proposed chart with other charts as well as the properties of the test statistic are presented. Simulations indicate that the proposed chart is sensitive in detection of the small mean shifts of the process by a high intensive accumulation of sample information when the underlying variable is completely distribution-free.
IaaS Public Cloud Computing Platform Scheduling Model and Optimization Analysis  [PDF]
Aobing Sun, Tongkai Ji, Qiang Yue, Feiya Xiong
Int'l J. of Communications, Network and System Sciences (IJCNS) , 2011, DOI: 10.4236/ijcns.2011.432098
Abstract: IaaS (Infrastructure as a Platform) public cloud is one mainstream service mode for public cloud computing. The design aim of one IaaS public cloud is to enlarge the hardware-usage of whole platform, optimize the virtual machine deployment and enhance the accept rate of service demand. In this paper we create one service model for IaaS public cloud, and based on the waiting-line theory to optimize the service model, the queue length and the configuration of scheduling server. And create one demand-vector based scheduling model, to filter the available host machine according to the match of demand and metadata of available resource. The scheduling model can be bonded with the virtual machine motion to reallocate the resources to guarantee the available rate of the whole platform. The feasibility of the algorithm is verified on our own IaaS public cloud computing platform.
Thermoluminescence characteristics of Li2B4O7:Cu,Ag,P
ZhengYe Xiong,ChunXiang Zhang,Qiang Tang
Chinese Science Bulletin , 2007, DOI: 10.1007/s11434-007-0236-7
Abstract: This paper reports the thermoluminescence (TL) characteristics of lithium borate activated by Cu, Ag and P. The glow curves and spectra of thermoluminescence were measured, and the thermoluminescence response as a function of the absorbed dose and the fading behavior were studied. The results indicate that TL of this material has a low fading and wide linear dose response (10 4–103 Gy).
On particles tunneling from the Taub-NUT-AdS black hole

Zeng Xiao-Xiong,Li Qiang,

中国物理 B , 2009,
Abstract: This paper discusses tunneling of scalar particles and Dirac particles from the Taub-NUT-AdS black hole by the Hamilton--Jacobi equation, initially used by Angheben et al, and the Dirac equation, recently proposed by Kerner and Mann. This is performed in the dragging coordinate frame so as to avoid the ergosphere dragging effect. A general form is obtained for the temperature of scalar and Dirac particles tunneling from the Taub-NUT-Ads black hole, which is commensurate with other methods as expected.
Geometric properties of river cross sections and associated hydrodynamic implications in Wuhan–Jiujiang river reach, the Yangtze River

ZHANG Qiang,SHI Yafeng,XIONG Ming,

地理学报 , 2009,
Abstract: Based on measured hydrological data by using ship-mounted Acoustic Doppler Current Profiler (ADCP) instrument, we analyzed shapes of river cross sections of the middle Yangtze River basin (mainly focusing on Makou and Tianjiazhen river reach). Hydrodynamic properties of river channels were also discussed. The research results indicate that nonlinear relationships can be identified between river-width/river-depth ratio (W/D ratio), sizes of cross section and mean flow velocity. Positive relations are detected between W/D ratio and mean flow velocity when W/D<1; and negative relations are observed when W/D>1. Adverse relationships can be obtained between W/D ratio and cross-section area. Geomorphologic and geologic survey indicates different components of river banks in the wider and narrower river reaches respectively. These may be the main driving factors causing unique hydrological properties of river channels in the middle Yangtze River basin. Narrower river cross sections tend to raise water level in the upstream river reach near narrower river channel, giving rise to backwater effects. River knots can cause serious backwater effects, which is harmful for flood mitigation. However river knots will also stabilize river channel and this will be beneficial for river channel management. The results of this paper may be helpful for flood mitigation and river channel management in the middle Yangtze River basin.
Comparison of Gelation Time and Polyalcohol Effect on Hydrogels from Domestic and Wild Silk Fibroins
Huijing Zhao,Siyong Xiong,Mingzhong Li,Qiang Zhang,Guiyang Liu
Advances in Materials Science and Engineering , 2012, DOI: 10.1155/2012/819464
Abstract: Silk fibroin (SF) hydrogels were obtained from both domestic (Bombyx mori) and wild (Antheraea pernyi) silkworms from aqueous silk fibroin solutions at room temperature. The gelation time of the Antheraea pernyi (A. pernyi) SF solution was significantly shorter than that of the Bombyx mori (B. mori) SF solution. The secondary structures of the two kinds of hydrogels were also compared. In order to further reduce the gelation time, various amounts of polyethylene glycol (PEG) were blended with the silk fibroins of A. pernyi and B. mori. The gelation time of both A. pernyi SF and B. mori SF decreased with the increased amount of PEG. After freeze-drying, the hydrogels were characterized through X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), and Raman spectroscopy. Results showed that the addition of polyalcohol did not change the main secondary structure of the hydrogels. However, the addition of polyalcohol did reduce the gelation time and triggered additional formation of β-sheets. 1. Introduction Hydrogels can maintain a distinct three-dimensional porous structure with mechanical and structural properties similar to that of many natural tissues and extracellular matrices (ECMs) and can be delivered in a minimally invasive manner [1]. Therefore, hydrogels are of interest for many biomedical applications such as tissue engineering scaffolds, controlled drug release devices, and biosensors [2]. Hydrogels can be made of either synthetic materials or naturally derived materials [3]. Among naturally derived materials, it is agreed that silkworm silk fibroin (SF) is one of the most promising biomaterials because of its excellent biocompatibility, biosafety, controllable biodegradation rates, processability, and mechanical properties [4]. Silkworm silk fibroin is excreted by domestic (B. mori) and wild (A. pernyi) silkworms. Domestic SF hydrogels are of interest for use as bone-filling biomaterials, wound dressing, and so on and have proved to be promising for healing efficacy [5–10]. Compared with B. mori SF, A. pernyi SF, the most familiar wild SF, has more advantages in terms of chemical activity and high-affinity interactions with mammalian cells [11]. A. pernyi SF is rich in amino acids having polarity and ionogenic pendant groups, which are the potential reactive sites of chemical reactions. In terms of amino acids, A. pernyi SF has more Ala, Asp, and Arg and less Gly than does B. mori. Further, A. pernyi SF also has abundant alkaline amino acids (Arg and His) and the tripeptide sequence Arg-Gly-Asp (RGD), which is known to be
Electroacupuncture Pretreatment as a Novel Avenue to Protect Brain against Ischemia and Reperfusion Injury
Xin Li,Peng Luo,Qiang Wang,Lize Xiong
Evidence-Based Complementary and Alternative Medicine , 2012, DOI: 10.1155/2012/195397
Abstract: Electroacupuncture (EA) pretreatment is a recent observation which has been shown to induce ischemic tolerance mimicking the ischemic pretreatment, suggesting that EA pretreatment may be a promising preventive strategy for the patients with high risk of acute ischemia/reperfusion injury. It was first described in the brain, then in the heart where EA stimulation at acupoint prior to ischemia led to neuroprotection and myocardial protection and induced rapid and delayed ischemic tolerance. Then the optimal parameters and acupoint specificity of EA pretreatment to induce protective effect were proved. Many studies have shown that protective mechanisms of EA pretreatment may involve a series of regulatory molecular pathways including activity enhancement of antioxidant, regulation of the endocannabinoid system, involvement of beta-adrenergic receptor, and postreceptor signaling pathway, inhibition of apoptosis. Recently, the neuroprotective and cardioprotective effect of EA pretreatment had been demonstrated in patients undergoing craniocerebral tumor resection or heart valve replacement surgery. Thus, the purpose of this paper is to collect the evidence for the neuroprotective effect of EA pretreatment, to summarize the proposed protective mechanisms of EA pretreatment, and to discuss the possibility of EA pretreatment as a new preventive strategy for patients with high risk of ischemia in clinic.
A Vascular-Network-Based Nonuniform Hierarchical Fault-Tolerant Routing Algorithm for Wireless Sensor Networks
Hongbing Li,Peng Gao,Qingyu Xiong,Weiren Shi,Qiang Chen
International Journal of Distributed Sensor Networks , 2012, DOI: 10.1155/2012/981380
Abstract: Fault tolerance is the key technology in wireless sensor networks which attracts many research interests. Aiming at the issue that the nodes' failures affect the network's stability and service quality, a vascular-network-based fault-tolerant routing algorithm is presented by nonuniform hierarchical clustering. According to the distribution characteristics of the vascular network and inspirations to the fault tolerance for wireless sensor networks, a mathematical model and network topology are, respectively, established. It applies the improved particle swarm optimization (IPSO) to the nonuniform hierarchical clustering, and multipaths are established between the neighbor hierarchical nodes based on the best-worst ant system (BWAS). It introduces the normalized values of the pheromone generated by the ants as the selection probabilities of transmitting paths to establish the hierarchical routing. Theoretical analysis and simulations show that the algorithm has higher packet receiving rates, lower average transmission delay, and balanced energy consumption. It has the good performance in fault tolerance and stability of data transmitting, and it avoids the hot issue in energy consumption and achieves the network load balance. 1. Introduction Due to the characteristics of dynamic variation of the topology, no center ad hoc network and the constraints of the resources in wireless sensor networks (WSNs), as well as the unpredictability of the working scenario, such as the vibration and electromagnetic interference, it is prone to unbalance of energy consumption, poor quality of data transmission, and routing instability [1, 2]. So they have great influence on the key technologies, including average transmission delay, packet receiving rate, and average energy consumption, which closely correlate with the network’s stability, accuracy, and reliability. They also weaken the reserved function and bring greater challenges to the existing network technologies, especially for the application in the complex scenario and necessity for strict performance, just like condition monitoring for key facilities and poisonous gas, emergency, and disaster releasing. The network with good performance should have the integrity of the fault features, the accuracy of fault diagnosis, and fault recovery efficiency. It can perform well in the robustness of nodes’ interconnection, accuracy of data transmission, and against the fast energy consumption as well as the malicious invasion. It also can make a timely diagnosis, find a reasonable control decision, and continue to provide
Anti-Migration Effects of Gekko Sulfated Glycopeptide on Human Hepatoma SMMC-7721 Cells
Xiong-Zhi Wu,Dan Chen,Xiao-Qiang Han
Molecules , 2011, DOI: 10.3390/molecules16064958
Abstract: Gekko swinhonis Guenther has been used as an anti-cancer drug in traditional Chinese medicine for hundreds of years. Previous studies showed that the Gekko sulfated polysaccharide-protein complex suppressed the proliferation and migration of hepatoma cells. Gekko sulfated glycopeptide α was obtained from Gekko sulfated polysaccharide-protein complex using papain hydrolysis. Gekko sulfated glycopeptide α inhibited the proliferation and migration of SMMC-7721 cells. The secretion of IL-8 and the concentration of intracellular calcium were decreased after Gekko sulfated glycopeptide α exposure. SMMC-7721 cells in the control group showed abnormal features, with a polygonal shape, whereas this changed to a spindle shape after the treatment with Gekko sulfated glycopeptide α. Actin ?laments were distributed diffusely along the cell membrane in control cells, whereas those were polymerized and preferentially accumulated in the cytoplasm of treated cells. Microtubules distributed in the cytoplasm of untreated cells were located diffusely whereas those in treated cells were polymerized. Therefore, Gekko sulfated glycopeptide α inhibit the migration of hepatoma cells via reducing the secretion of IL-8 and the concentration of intracellular calcium, as well as regulating the reorganization of cytoskeleton.
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