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Search Results: 1 - 10 of 120529 matches for " Zhiwei Wang "
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Bergman kernels and eigenvalue estimate of $\bar{\partial}$-laplacian
Zhiwei Wang
Mathematics , 2013,
Abstract: Let $(X,\omega)$ be a compact K\"{a}hler manifold. Let $(L,h)$ be a hermitian holomorphic line bundle over $X$, such that $\Theta_{L,h}\geq -\varepsilon\omega$ for a small $\varepsilon>0$, $E$ be a holomorphic line bundle over $X$. For $k\in \mathbb{N}_+$, denote by $X_k:=(X,\omega^k)$ the K\"{a}hler manifold $X$ with new scaled metric $\omega^k=k\omega$. Estimates of the number of eigenvalues smaller than $\lambda$ of the $\debar$-Laplacian on forms on $X_k$ with values in $L^k\otimes E$ are presented for $0\leq \lambda
Explicit Solutions of the Coupled mKdV Equation by the Dressing Method via Local Riemann-Hilbert Problem  [PDF]
Ting Su, Guohua Ding, Zhiwei Wang
Applied Mathematics (AM) , 2016, DOI: 10.4236/am.2016.715150
Abstract: We study the coupled mKdV equation by the dressing method via local Riemann-Hilbert problem. With the help of the Lax pairs, we obtain the matrix Riemann-Hilbert problem with zeros. The explicit solutions for the coupled mKdV equation are derived with the aid of the regularization of the Riemann-Hilbert problem.
Temperature and Flow Rate Control of Diffusing Chamber  [PDF]
Yongbo Lai, Guoping Lu, Zhiwei Wang
World Journal of Engineering and Technology (WJET) , 2017, DOI: 10.4236/wjet.2017.51006
Abstract: The temperature and flow rate control of diffusing chamber is one of the key technologies in the production of poly-crystal silicon thin film. As there exist some modeling uncertainties and errors in the actual system, it is difficult to guarantee the chamber variable temperature conditions and the flow rate of diffusion gas being controlled within its targeted range in the rapid thermal processing (RTP). In this paper, the control applies the programmable logic controller (PLC) to configure control hardware system, proposes expert proportional integral derivative (PID) control method to regulate the gas flow rate and H∞ control strategy to attenuate chamber modeling uncertainties and disturbances, respectively, to steer the chamber rapid variable temperature very close to the expected product temperatures. Furthermore, it designs human-machine integrated user control interface (HMI) and achieves rapid and accurately control performances for user operating production. The designed control system are simulated and tested in the application, which demonstrates that the control method has strong robustness when the modeling uncertainties, errors, parameters perturbation and disturbances, the temperature and flow rate meet the requirements of precisely trajectory following.
Analysis and Application of Hydropower Real-time Performance Calculation  [PDF]
Dequn Feng, Zhiwei Wang, Pengbo Ma, Wenqing Wang
Energy and Power Engineering (EPE) , 2013, DOI: 10.4236/epe.2013.54B012
Abstract: The hydropower running and performance can be displayed and analyzed by the real-time remote system. Real-time performance data of the hydraulic turbine unit can be obtained through the analysis of real-time operating data of the hydraulic turbine unit. It can not only guide significance for long-term operation of hydraulic turbine unit, but also provide a reference for improving the Hydropower hydro efficiency, economic dispatch of hydraulic turbine unit and performance comparison before and after the overhaul.
A case of interstitial pneumonia caused by carmustine
Zhiwei WANG,Weian SONG
Chinese Journal of Lung Cancer , 2008,
Investigation of Resonator BWO-Based Spectroscopy of the Atmosphere in the THz Region  [PDF]
Yuwen Wang, Zhiwei Dong, Xun Zhou, Zhenfei Luo
Journal of Computer and Communications (JCC) , 2016, DOI: 10.4236/jcc.2016.43010

This paper intends to give a code about atmospheric propagation effects affecting terahertz (THz) communication system. The main focus is on attenuation caused by atmospheric gases with the radiation transmission theory and the empirical continuum absorption based on the HITRAN database. Theoretical aspects about them are presented, emphasizing on those which deserve special attention as frequency increases. Laboratory measurements of the absorption spectra of laboratory air and major atmospheric gases mixed with water vapor in the 250 - 350 GHz frequency range at atmospheric pressure and room temperature on a basis of backward wave oscillators (BWOs) are obtained. The results of experiments are compared with the calculations. It is found that the water vapor transmittance is greater than the calculation. Data of these measurements agree with the results of analysis of atmospheric spectra with in statistical accuracy of experiments. Accurate measurements are also needed for further studies of the physics of the molecules and their interactions. The investigation makes it significant for enhancing accuracy of models of radiation propagation in the atmosphere.

Experiences of Fatigue at Sea—A Comparative Study in European and Chinese Shipping Industry  [PDF]
Zhiwei Zhao, Jorgen Riis Jepsen, Zhonglong Chen, Huanxin Wang
Journal of Biosciences and Medicines (JBM) , 2016, DOI: 10.4236/jbm.2016.43011

Fatigue has negative impacts on the general working population as well as on seafarers. In order to study seafarers’ fatigue, a questionnaire-base survey was conducted to gain information about potential risk factors for fatigue and construct indexes indicating fatigue. The study applies T-test to compare strata of seafarers to analyse work and sleep patterns in global seafaring. Qualitative analysis are also employed to explore the impacts of fatigue on seafarer’s occupational health and safety.

Analysis of Air Pollutants in Xiong’an New Area Based on MATLAB Grey Model  [PDF]
Ying Xie, Wenjun Wang, Baochang Li, Zhiwei Zhao, Lei He
Open Journal of Air Pollution (OJAP) , 2018, DOI: 10.4236/ojap.2018.74015
Abstract: The purpose of this paper is to study the air pollutants in Xiong’an New Area based on MATLAB grey model [1]. From 2011 to 2016, the results of sulfur dioxide (SO2), nitrogen dioxide (NO2) and inhalable particulate matter (PM1O) detected at monitoring points in the three counties of Xiong’an were analyzed. According to the national environmental air quality standard [2], the air quality in Xiong’an New Area was reasonably evaluated based on grey model in MATLAB. Judging from the weight of pollution factors in the model, sulfur dioxide (SO2) is the controlling factor of air quality in Xiong’an New Area, and the weight of nitrogen dioxide (NO2) gradually increases. The main sources of the three pollutants were obtained by comprehensive data analysis, and a grey model was established according to the mass concentration of the main air pollutants, and the grey forecasting model was tested. The experimental results show that the model can be effectively applied to the forecasting of ambient air quality. On this basis, the present situation of atmospheric environmental quality in Xiong’an New Area and suggestions for improvement are obtained.
Overcome the Impairment of NK Cells for Icon and Antibody Immunotherapy of Cancer  [PDF]
Zhiwei Hu
Journal of Immune Based Therapies, Vaccines and Antimicrobials (JIBTVA) , 2013, DOI: 10.4236/jibtva.2013.21001
Abstract: Natural killer (NK) cells play an important role in innate immunity and in mediating antibody and Icon (an antibody-like factor VII/IgG1 Fc immunoconjugate, which, to our best knowledge, was the first therapeutic agent for dual targeting of both the tumor cells and tumor angiogenic endothelial cells) for cancer immunotherapy. However, a common yet often neglected observation and challenge in antibody immunotherapy is that NK cells are often impaired in cancer patients. Here we hypothesize that the impairment of NK cells significantly contributes to host resistance to antibody immunotherapy for cancer. In order for antibody and Icon to achieve their optimal therapeutic efficacy, we briefly reviewed the current strategies to enhance NK activity, including infusion of cytokines, vaccines or NK cells, and the use of dietary supplements. Moreover, from our point of view we identified some remaining challenges and propose to combine these NK-enhancing strategies with Icon or antibody to overcome NK impairment and ultimately to optimize the efficacy of Icon and antibody immunotherapy for cancer.
Variation of drought over northern China during 1950-2000

WANG Zhiwei,ZHAI Panmao,ZHANG Hongtao,

地理学报 , 2003,
Abstract: Based on China's monthly precipitation data of 629 stations during 1950-2000, we calculated Z indices and separated them into seven Dryness and Wetness grades. Further, a drought area index was proposed to study changes in drought severity in northern China. The results revealed that the different severity of droughts all showed expanding trends in northern China's main agricultural area. Moreover, the area coverage of droughts in different seasons and different regions displayed different trends.
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