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Search Results: 1 - 10 of 18637 matches for " Guoxin Han "
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An Experimental Study on the Temperature Characteristic of a 940 nm Semiconductor Laser Diode  [PDF]
Yiru Liao, Jianjun Li, Guoxin Mi, Haikuo Wang, Yuancheng Wang, Jun Deng, Jun Han
Optics and Photonics Journal (OPJ) , 2016, DOI: 10.4236/opj.2016.68B013
This paper is focused on a 940 nm edge type of semiconductor laser, which is made from 940 nm InGaAs double-quantum-well epitaxial wafer, produced by Metal Organic Chemical Vapor Deposition (MOCVD). In the absence of coating, the efficiency at the room temperature is 0.89 W/A, and the averaged threshold current is 0.307 A. The present study investigates the impact of temperature on the P-I curve, V-I curve and the centre wavelength, the temperature ranging from 286.15 - 333.15 K. It shows that the threshold current increases from 0.28 A to 0.41 A with the increasing temperature. The increase rate is 0.0027 A/K. With the temperature ranging from 286.15 - 333.15 K, the characteristic temperature is calculated to be 120 K. At driven current of 2 A, the output power decreases from 1.47 W to 1.27 W at a rate of 0.00425 W/K. At a constant voltage, the output current initially increases with the temperature within a certain range, beyond which the impact of the temperature is minimum. The ideal factor obtained from V-I curve by curve fitting is 1.076. The series resistance is 0.609 Ω. The centre wavelength shifts to a longer wavelength with the increasing temperature at a rate of 0.275288 nm/K.
The Synergistic Effects Study of C-myc and C-erbB-2 in the Carcinogenesis of Gastric Carcinoma  [PDF]
Keqiang Wang, Jiangang Liu, Yanchao Duan, Shengyi Dongye, Jiafeng Wu, Yiren Wang, Zhenzhong Liu, Guoxin Han
Open Journal of Gastroenterology (OJGas) , 2017, DOI: 10.4236/ojgas.2017.712032
Abstract: Objective: To study the significance of c-myc and c-erbB-2 oncogene expression in gastric cancer. Methods: 81 gastric cancer specimens were detected for c-myc and c-erbB-2 oncogene amplification using non-radioactive in situ hybridization method. Results: The amplification rates for c-myc and c-erbB-2 were 67.9% and 50.6% respectively, and there were significant correlation in the amplification of these two genes (χ2 = 7.26, P < 0.01). Conclusions: The amplification of c-myc and c-erbB-2 may play an important role in gastric cancer development, and these two genes may have synergistic effect.
A Self-Similar Call Admission Control Algorithm in WiMAX  [PDF]
Yongdong Hu, Guoxin Wu
Int'l J. of Communications, Network and System Sciences (IJCNS) , 2016, DOI: 10.4236/ijcns.2016.95016

Modelling WiMAX network traffic based on the self-similarity character is better than the traditional model based on the Poisson process, because the former can provide more accurate calculation for effective bandwidth. In this paper we propose a WiMAX network traffic model based on M/Pareto model to describe its self-similarity character. Then we deduce the average transmission rate and the variance coefficient for the FBM traffic model by the M/Pareto model, and get the Hurst parameter of the FBM traffic model by statistical analysis method. By the FBM traffic model we get a formula for calculating the effective bandwidth. Accordingly, we propose a modified self-similar call admission control algorithm (SS-CAC). SS-CAC can avoid measuring the parameter values of FBM traffic flow to do call admission control. Simulation results show that SS-CAC greatly reduces the call blocking rate and improves the bandwidth utilization.

Stability Analysis and Robust Control of Switched Stochastic Systems with Time-Varying Delay
Zhengrong Xiang,Guoxin Chen
Journal of Applied Mathematics , 2012, DOI: 10.1155/2012/202916
Abstract: The problems of mean-square exponential stability and robust ∞ control of switched stochastic systems with time-varying delay are investigated in this paper. Based on the average dwell time method and Gronwall-Bellman inequality, a new mean-square exponential stability criterion of such system is derived in terms of linear matrix inequalities (LMIs). Then, ∞ performance is studied and robust ∞ controller is designed. Finally, a numerical example is given to illustrate the effectiveness of the proposed approach.
Symmetry, Optical Properties and Thermodynamics of Neptunium(V) Complexes
Linfeng Rao,Guoxin Tian
Symmetry , 2010, DOI: 10.3390/sym2010001
Abstract: Recent results on the optical absorption and symmetry of the Np(V) complexes with dicarboxylate and diamide ligands are reviewed. The importance of recognizing the “silent” feature of centrosymmetric Np(V) species in analyzing the absorption spectra and calculating the thermodynamic constants of Np(V) complexes is emphasized.
Styrene polymerization catalyzed by nickel complexes bearing hydroxyindanone-iminate ligands
GuangRong Tang,GuoXin Jin
Chinese Science Bulletin , 2008, DOI: 10.1007/s11434-008-0378-2
Abstract: Activated by methylaluminoxane, mononuclear bis(hydroxyindanone-iminate)nickel complexes Ni[ArN = CC2H3(CH3)C6H2(R)O]2 (Ar = 2,6-i-Pr2C6H3, R = Me (1), R = Cl (2), and R = H (3)) showed good activity for the styrene polymerization. The effect of many reaction parameters including the Al/Ni ratio, temperature, and reaction time on catalytic activities of catalytic systems and the molecular weights of the obtained polystyrene was ascertained. The highest activity of 1.34×105 g(PS) · mol 1(Ni) · h 1 was obtained under the optimum reaction condition. The 13C NMR spectra of the polymers revealed that the polymer was isotactic-rich atactic polystyrene. And the coordination mechanism was confirmed by the analyses of the polymer chain end-groups.
Half-sandwich rhodium polychalcogenide complexes and a carbon insertion into Te-Te bond
Qingan Kong,Guoxin Jin
Chinese Science Bulletin , 2002, DOI: 10.1360/02tb9044
Abstract: Treatment of CptRh(PMe3)Cl2(l) (Cpt = 5 η-tBu2C5H3) with [Et4N]2Se6 in DMF solution leads to the formation of cyclo-tetraselenido half-sandwich rhodium complexes CptRh(PMe3)(Se4) (2). The elimination of 2 with excess of nBu3P results in cyclo-diselenido rhodium complex CptRh(PMe3)(Se2) (3). 1 reacts with [nBu4N]2Te5 in DMF solution to yield cyclo-ditellurido rhodium complex Cp_tRh (PMe3)(Te2) (4) in which carbon atom from CH2C12 can be inserted into Te-Te bond to form CptRh(PMe3)(TeCH2Te) (5). The new complexes 2–5 have been characterized by their IR, EI-MS, and 1H, 13C, 31P, 103Rh NMR spectra as well as elemental analysis.


物理学报 , 1998,
Abstract: 晶界空间电荷层在高纯的稳定化ZrO2的晶界电阻中起着重要作用,以此为基础,提出了一个稳定化ZrO2的晶界导电模型,根据这个模型分析了Ca,Y和Al的晶界偏聚对稳定化ZrO2的晶界导电性的影响,并同时分析了被广泛应用的以Bauerle等效电路为基础的晶界电阻测量方法的局限性,以及一些晶界性能表征参量的物理意义及欠妥之处.
Dynamic Proportional Reinsurance and Approximations for Ruin Probabilities in the Two-Dimensional Compound Poisson Risk Model
Yan Li,Guoxin Liu
Discrete Dynamics in Nature and Society , 2012, DOI: 10.1155/2012/802518
Dynamic Proportional Reinsurance and Approximations for Ruin Probabilities in the Two-Dimensional Compound Poisson Risk Model
Yan Li,Guoxin Liu
Discrete Dynamics in Nature and Society , 2012, DOI: 10.1155/2012/802518
Abstract: We consider the dynamic proportional reinsurance in a two-dimensional compound Poisson risk model. The optimization in the sense of minimizing the ruin probability which is defined by the sum of subportfolio is being ruined. Via the Hamilton-Jacobi-Bellman approach we find a candidate for the optimal value function and prove the verification theorem. In addition, we obtain the Lundberg bounds and the Cramér-Lundberg approximation for the ruin probability and show that as the capital tends to infinity, the optimal strategies converge to the asymptotically optimal constant strategies. The asymptotic value can be found by maximizing the adjustment coefficient. 1. Introduction In an insurance business, a reinsurance arrangement is an agreement between an insurer and a reinsurer under which claims are split between them in an agreed manner. Thus, the insurer (cedent company) is insuring part of a risk with a reinsurer and pays premium to the reinsurer for this cover. Reinsurance can reduce the probability of suffering losses and diminish the impact of the large claims of the company. Proportional reinsurance is one of the reinsurance arrangement, which means the insurer pays a proportion, say , when the claim occurs and the remaining proportion, , is paid by the reinsurer. If the proportion can be changed according to the risk position of the insurance company, this is the dynamic proportional reinsurance. Researches dealing with this problem in the one-dimensional risk model have been done by many authors. See for instance, H?jgaard and Taksar [1, 2], Schmidli [3] considered the optimal proportional reinsurance policies for diffusion risk model and for compound Poisson risk model, respectively. Works combining proportional and other type of reinsurance polices for the diffusion model were presented in Zhang et al. [4]. If investment or dividend can be involved, this problem was discussed by Schmidli [5] and Azcue and Muler [6], respectively. References about dynamic reinsurance of large claim are Taksar and Markussen [7], Schmidli [8], and the references therein. Although literatures on the optimal control are increasing rapidly, seemly that none of them consider this problem in the multidimensional risk model so far. This kind of model depicts that an unexpected claim event usually triggers several types of claims in an umbrella insurance policy, which means that a single event influences the risks of the entire portfolio. Such risk model has become more important for the insurance companies due to the fact that it is useful when the insurance companies
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