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Search Results: 1 - 10 of 335388 matches for " C. Wang "
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A Control Strategy for Smoothing Active Power Fluctuation of Wind Farm with Flywheel Energy Storage System Based on Improved Wind Power Prediction Algorithm  [PDF]
J. C. Wang, X. R. Wang
Energy and Power Engineering (EPE) , 2013, DOI: 10.4236/epe.2013.54B075
Abstract: The fluctuation of active power output of wind farm has many negative impacts on large-scale wind power integration into power grid. In this paper, flywheel energy storage system (FESS) was connected to AC side of the doubly-fed induction generator (DFIG) wind farm to realize smooth control of wind power output. Based on improved wind power prediction algorithm and wind speed-power curve modeling, a new smooth control strategy with the FESS was proposed. The requirement of power system dispatch for wind power prediction and flywheel rotor speed limit were taken into consideration during the process. While smoothing the wind power fluctuation, FESS can track short-term planned output of wind farm. It was demonstrated by quantitative analysis of simulation results that the proposed control strategy can smooth the active power fluctuation of wind farm effectively and thereby improve power quality of the power grid.
The sensitivity of tropical convective precipitation to the direct radiative forcings of black carbon aerosols emitted from major regions
C. Wang
Annales Geophysicae (ANGEO) , 2009,
Abstract: Previous works have suggested that the direct radiative forcing (DRF) of black carbon (BC) aerosols are able to force a significant change in tropical convective precipitation ranging from the Pacific and Indian Ocean to the Atlantic Ocean. In this in-depth analysis, the sensitivity of this modeled effect of BC on tropical convective precipitation to the emissions of BC from 5 major regions of the world has been examined. In a zonal mean base, the effect of BC on tropical convective precipitation is a result of a displacement of ITCZ toward the forcing (warming) hemisphere. However, a substantial difference exists in this effect associated with BC over different continents. The BC effect on convective precipitation over the tropical Pacific Ocean is found to be most sensitive to the emissions from Central and North America due to a persistent presence of BC aerosols from these two regions in the lowermost troposphere over the Eastern Pacific. The BC effect over the tropical Indian and Atlantic Ocean is most sensitive to the emissions from South as well as East Asia and Africa, respectively. Interestingly, the summation of these individual effects associated with emissions from various regions mostly exceeds their actual combined effect as shown in the model run driven by the global BC emissions, so that they must offset each other in certain locations and a nonlinearity of this type of effect is thus defined. It is known that anthropogenic aerosols contain many scattering-dominant constituents that might exert an effect opposite to that of absorbing BC. The combined aerosol forcing is thus likely differing from the BC-only one. Nevertheless, this study along with others of its kind that isolates the DRF of BC from other forcings provides an insight of the potentially important climate response to anthropogenic forcings particularly related to the unique particulate solar absorption.
Belle CP violation in b to sqq and uud processes
C. C. Wang
Physics , 2004,
Abstract: We report the analysis of time-dependent CP violation in neutral B meson system using a data sample corresponding to 140fb-1 collected by Belle detector and KEKB e+e- collider. One B meson decaying into CP eigenstate is fully reconstructed and the accompanying B meson flavor is identified by its decay products. The CP violation parameters are determined from the distribution of proper time intervals between the two B decays. Here we cover measurements of CP violation in b to uud and b to sq \bar{q$ processes.
Study of B0 -> rho+-pi-+ Time-dependent CP Violation at Belle
C. C. Wang,for the Belle Collaboration
Statistics , 2004, DOI: 10.1103/PhysRevLett.94.121801
Abstract: We present a time-dependent analysis of CP violation in B0 -> rho pi decays based on a 140 1/fb data sample collected at the Y(4S) resonance with the Belle detector at the KEKB asymmetric-energy e+e- collider. We fully reconstruct one neutral B meson in the rho+-pi-+ final state and identify the flavor of the accompanying B meson from its decay products. We obtain the charge asymmetry ACP = -0.16+-0.10(stat)+-0.02(syst). An unbinned maximum likelihood fit to the proper-time distributions yields C = 0.25+-0.17(stat)+0.02-0.06(syst), DC = 0.38+-0.18(stat)+0.02-0.04(syst), S = -0.28+-0.23(stat)+0.10-0.08(syst), and DS = -0.30+-0.24(stat)+-0.09(syst). The direct CP violation parameters for B -> rho+pi- and B -> rho-pi+ decays are A+- = -0.02+-0.16(stat)+0.05-0.02(syst) and A-+ = -0.53+-0.29(stat)+0.09-0.04(syst).
Low Power Dual Word Line 6-Transistor SRAMs
Michael C. Wang
Lecture Notes in Engineering and Computer Science , 2009,
Low Power, Area Efficient FinFET Circuit Design
Michael C. Wang
Lecture Notes in Engineering and Computer Science , 2009,
Independent-Gate FinFET Circuit Design Methodology
Michael C. Wang
IAENG International Journal of Computer Science , 2010,
A CPW-Fed Novel Planar Ultra-Wideband Antenna with a Band-Notch Characteristic
F. Yu,C. Wang
Radioengineering , 2009,
Abstract: A coplanar waveguide (CPW) fed novel planar ultra-wideband antenna with a band-notch characteristic is presented. The proposed antenna consists of a rectangular metal radiation patch and a tapered arc-shaped ground plane. To achieve ultra wideband, three modifications are introduced, the first one is to remove a 90-degree fan angle on the upper corners of the patch, the second one is to shape the bottom of the patch into an arc, and the third modification is to remove a small fan angle on each side of the ground plane near the feeding line. Simulation results show that the proposed antenna operates over 3.0 to 23 GHz for VSWR < 2. By embedding a C-shaped slot in the radiating patch, a frequency band notch between the bandwidth of 5 to 6 GHz for Wireless LAN (WLAN) will be obtained. All simulations in this work were carried out by using the electromagnetic software Ansoft HFSS 11. Compared with the recently proposed antennas, this antenna has advantages in wide bandwidth, good band-notch characteristic, compact in size and easy design. Details of the proposed antenna are presented, and simulated results show that the antenna has stable radiation patterns and good gain flatness over its whole frequency band.
Project Hope and the Hope School System in China
Samuel C. Wang
Education Policy Analysis Archives , 1999,
Abstract: I investigate the creation, development, contributions and limits of Project Hope, a huge government-endorsed education project seeking non-governmental contributions to overcome educational inadequacy in poverty-stricken rural communities in transitional China. By reexamining the composition of sponsored students, the locations of Hope Primary Schools and non-educational orientations for building and expanding schools, I argue that Project Hope and its Hope School system have not contributed to educational access, equality, equity, efficiency and quality as it should have. Poverty-reduction-oriented curriculum requirements in Hope Primary Schools are theoretically misleading and realistically problematic.
Selection of Periodical: A Cognitive Statistical Approach
  John K. C. Wang
Journal of Library and Information Science , 1980,
Abstract: 頁次:17-24
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