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Search Results: 1 - 10 of 150634 matches for " WANG Zhi-hui "
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Research of Magnetic Coupler Array for IPT System  [PDF]
Chao Hu, Yue Sun, Zhi-hui Wang, Shi-jie Zhou
Energy and Power Engineering (EPE) , 2013, DOI: 10.4236/epe.2013.54B204

The advance of Inducive Power Transfer (IPT) system is capable to transfer large power across an air gap of sufficient distance, but the power level and charging area of receiver are limited by the magnetic coupler of IPT system. This paper analyses the correlative factors which effect maximum output power (Pm), it reveals Pm is inversely proportional with magnetic flux of power receiving coils. New ferrite array structure is proposed as the basic part of magnetic coupler that focusing on enhancing the equilibrium of magnetic flux distribution at charging area and increasing power transfer distance. The method of winding on ferrite array is quite flexible and the power transmission distance can be increased by changing the mode of ferrite array windings while magnetic field uniform is reduced, users can chose the suitable mode of winding for different IPT system. Finally the validity of theory analysis is tested by a 3D finite element modeling tool.

Spin decoherence and electron spin bath noise of a nitrogen-vacancy center in diamond
Zhi-Hui Wang,Susumu Takahashi
Physics , 2012, DOI: 10.1103/PhysRevB.87.115122
Abstract: We theoretically investigate spin decoherence of a single nitrogen-vacancy (NV) center in diamond. Using the spin coherent state P-representation method, coherence evolution of the NV center surrounded by nitrogen electron spins (N) is simulated. We find that spin decoherence time as well as free-induction decay of the NV center depend on the spatial configuration of N spins. Both the spin decoherence rate (1/T2) and dephasing rate (1/T2*) of the NV center increase linearly with the concentration of the N spins. Using the P-representation method, we also demonstrate extracting noise spectrum of the N spin bath, which will provide promising pathways for designing an optimum pulse sequence to suppress the decoherence in diamond.
Time-optimal rotation of a spin 1/2: application to the NV center spin in diamond
Zhi-Hui Wang,V. V. Dobrovitski
Mathematics , 2011, DOI: 10.1103/PhysRevB.84.045303
Abstract: We study the applicability of the time optimal bang-bang control designed for spin-1/2 [U. Boscain and P. Mason, J. Math. Phys. {\bf 47}, 062101 (2006)] to the rotation of the electron spin of a nitrogen-vacancy (NV) center in diamond. The spin of the NV center is a three-level system, with two levels forming a relevant qubit subspace where the time-varying magnetic control field performs rotation, and the third level being idle. We find that the bang-bang control protocol decreases the rotation time by 20--25% in comparison with the traditional oscillating sinusoidal driving. We also find that for most values of the bias field the leakage to the idle level is very small, so that the NV center is a suitable testbed for experimental study of the time-optimal protocols. For some special values of the bias field, however, the unwanted leakage is greatly increased. We demonstrate that this is caused by the resonance with higher-order Fourier harmonics of the bang-bang driving field.
Classification of the Super-conducting order parameters under the point group symmetry for a multi-band system: application to LaOFeAs
Zhi-Hui Wang,Hui Tang,Zhong Fang,Xi Dai
Physics , 2008,
Abstract: All the possible super-conducting order parameters for the LaOFeAs system are classified by their transformation under the complete crystal symmetry. The general forms of the super-conducting gap functions for each class are discussed. We find that the gap functions in such a multi-band system belong to three types, full gap, nodal type and finite {}``Fermi arc'' type. Possible physical consequences caused by different types of gap functions are also discussed.
Intrinsic Migratory Properties of Cultured Schwann Cells Based on Single-Cell Migration Assay
Ying Wang, Hong-Lin Teng, Zhi-hui Huang
PLOS ONE , 2012, DOI: 10.1371/journal.pone.0051824
Abstract: The migration of Schwann cells is critical for development of peripheral nervous system and is essential for regeneration and remyelination after nerve injury. Although several factors have been identified to regulate Schwann cell migration, intrinsic migratory properties of Schwann cells remain elusive. In this study, based on time-lapse imaging of single isolated Schwann cells, we examined the intrinsic migratory properties of Schwann cells and the molecular cytoskeletal machinery of soma translocation during migration. We found that cultured Schwann cells displayed three motile phenotypes, which could transform into each other spontaneously during their migration. Local disruption of F-actin polymerization at leading front by a Cytochalasin D or Latrunculin A gradient induced collapse of leading front, and then inhibited soma translocation. Moreover, in migrating Schwann cells, myosin II activity displayed a polarized distribution, with the leading process exhibiting higher expression than the soma and trailing process. Decreasing this front-to-rear difference of myosin II activity by frontal application of a ML-7 or BDM (myosin II inhibitors) gradient induced the collapse of leading front and reversed soma translocation, whereas, increasing this front-to-rear difference of myosin II activity by rear application of a ML-7 or BDM gradient or frontal application of a Caly (myosin II activator) gradient accelerated soma translocation. Taken together, these results suggest that during migration, Schwann cells display malleable motile phenotypes and the extension of leading front dependent on F-actin polymerization pulls soma forward translocation mediated by myosin II activity.
Study of control strategy and simulation in anoxic-oxic nitrogen removal process
PENG Yong-zhen,WANG Zhi-hui,WANG Shu-ying,
PENG Yong-zhen
,WANG Zhi-hui,WANG Shu-ying

环境科学学报(英文版) , 2005,
Abstract: The control strategy and simulation of external carbon addition were specially studied in an anoxic-oxic(A/O) process with low carbon: nitrogen(C/N) domestic wastewater. The control strategy aimed to adjust the flow rate of external carbon dosage to the anoxic zone, thus the concentration of nitrate plus nitrite(NOx--N) in the anoxic zone was kept closed to the set point. The relationship was studied between the NOx--N concentration in the anoxic zone(S_ NO) and the dosage of external carbon, and the results showed that the removal efficiency of the total nitrogen(TN) could not be largely improved by double dosage of carbon source when S_ NO reached about 2 mg/L. Through keeping S_ NO at the level of about 2 mg/L, the demand of effluent quality could be met and the carbon dosage could be optimized. Based on the Activated Sludge Model No.1(ASM No.1), a simplified mathematical model of external carbon dosage was developed. Simulation results showed that PI controller and feed-forward PI controller both had good dynamic response and steady precision. And feed-forward PI controller had better control effects due to its consideration of influent disturbances.
A biogenic volatile organic compounds emission inventory for Yunnan Province
WANG Zhi-hui,BAI Yu-hua,ZHANG Shu-yu,
WANG Zhi-hui
,BAI Yu-hu,ZHANG Shu-yu

环境科学学报(英文版) , 2005,
Abstract: The first detailed inventory for volatile organic compounds (VOC) emissions from vegetation over Yunnan Province, China was presented. The spatially and temporally resolved inventory was developed based on a geographic information system (GIS), remote sensing (RS) data and field measurement data, such as digitized land-use data, normalized difference vegetation index (NDVI) and temperature data from direct real-time measurement. The inventory has a spatial resolution of 5 km x 5 km and a time resolution of 1 h. Urban, agriculture, and natural land-use distributions in Yunnan Province were combined with biomass factors for each land-use category to produce a spatially resolved biomass inventory. A biogenic emission inventory was developed by combining the biomass inventory with hourly emission rates for tree, shrub and ground cover species of the study area. Correcting for environmental factors, including light intensity and temperature, a value of 1.1 x 10(12) gC for total annual biogenic VOC emissions from Yunnan Province, including 6.1 x 10(11) gC for isoprene, 2.1 x 10(11) gC for monoterpenes, and 2.6 x 10(11) gC for OVOC was obtained. The highest VOC emissions occurred in the northwestern, southwestern and north region of Yunnan Province. Some uncertainties were also discussed in this study.
Grouper tshβ Promoter-Driven Transgenic Zebrafish Marks Proximal Kidney Tubule Development
Yang Wang, Zhi-Hui Sun, Li Zhou, Zhi Li, Jian-Fang Gui
PLOS ONE , 2014, DOI: 10.1371/journal.pone.0097806
Abstract: Kidney tubule plays a critical role in recovering or secreting solutes, but the detailed morphogenesis remains unclear. Our previous studies have found that grouper tshβ (gtshβ) is also expressed in kidney, however, the distribution significance is still unknown. To understand the gtshβ role and kidney tubule morphogenesis, here, we have generated a transgenic zebrafish line Tg(gtshβ:GFP) with green fluorescent protein driven by the gtshβ promoter. Similar to the endogenous tshβ in zebrafish or in grouper, the gtshβ promoter-driven GFP is expressed in pituitary and kidney, and the developing details of proximal kidney tubule are marked in the transgenic zebrafish line. The gfp initially transcribes at 16 hours post fertilization (hpf) above the dorsal mesentery, and partially co-localizes with pronephric tubular markers slc20a1a and cdh17. Significantly, the GFP specifically localizes in proximal pronephric segments during embryogenesis and resides at kidney duct epithelium in adult fish. To test whether the gtshβ promoter-driven GFP may serve as a readout signal of the tubular development, we have treated the embryos with retinoic acid signaing (RA) reagents, in which exogenous RA addition results in a distal extension of the proximal segments, while RA inhibition induces a weakness and shortness of the proximal segments. Therefore, this transgenic line provides a useful tool for genetic or chemical analysis of kidney tubule.
Identification and analysis of phenotypic resistance characteristics of a novel mutation rtL180M+A181C+M204V in HBV reverse-transcriptase region of a patient with chronic hepatitis B
Jia-hui LIU,Yan LIU,Zhi-hui XU,Yan WANG
Medical Journal of Chinese People's Liberation Army , 2012,
Abstract: Objective  To identify a novel mutation rtA181C in HBV reverse-transcriptase (RT) region of a chronic hepatitis B (CHB) patient receiving sequential anti-HBV nucleoside/nucleotide analogues, and to analyze its phenotypic resistance characteristics. Methods  A 43-year-old CHB patient was identified in 302 Hospital of PLA in June 2010, serum HBV DNA was extracted and the HBV RT gene was amplified by nested PCR. The direct PCR sequencing and clonal sequencing were performed, and 12 drug-resistance-associated sites were analyzed. The recombinant plasmids pTriEx-HBV1.1 containing representative variation in RT region were constructed and transfected into HepG2 cells. The cell medium was supplemented with various concentrations of lamivudine, adefovir, entecavir and tenofovir 4 hours post-transfection. Four days later, HBV DNA level in the cell supernatant was quantified by real time PCR and the viral phenotypic resistance characteristics was analyzed. Results  The patient receiving lamivudine for 36 months, adefovir for 14 months, and entecavir for 29 months consecutively, and viral rebound and biochemical breakthrough subsequently occurred. HBV DNA increased to 1.1×106IU/ml, and ALT level increased to 235U/L. rtL180M+A181V+M204V mutation was identified in HBV RT region, and clonal analysis showed that 9 of 18 clones for rtL180M+A181V+M204V, 7 of 18 for rtL180M+A181C+M204V, 1 of 18 for rtV173L+L180M+A181V, and 1 of 18 for wild type virus were obtained. The viral replication capacity showed that wild type>rtV173L+L180M+A181V>rtL180M+A181C+M204V>rtL180M+A181V+M204V. Compared to the wild type virus, rtL180M+A181V+M204V and rtV173L+L180M+A181V variants were relatively less susceptible to lamivudine and adefovir, while rtL180M+A181C+M204V variant was less susceptible to lamivudine and entecavir. Conclusions  Long-term sequential treatment with nucleoside/nucleotide analogues may lead to occurrence of multidrug resistance; production of novel substitution in form of rtA181C from rt181 may be related to long-term administration of entecavir, and it probably is a novel drug-resistant mutation site of entecavir.
The Productions and Strong Decays of $D_q(2S)$ and $B_q(2S)$
Zhi-Hui Wang,Guo-Li Wang,Jin-Mei Zhang,Tian-Hong Wang
Physics , 2012, DOI: 10.1088/0954-3899/39/8/085006
Abstract: We study the productions of first radial excited states $D_q(2S)$ ($q=u, d, s$) and $B_q(2S)$ in exclusive semi-leptonic $B_{q'}$ ($q'=u, d s, c$) decays by the improved Bethe-Salpeter method. These 2S states can be detected through their strong decays to ground mesons, where the strong decays are calculated by the low energy approximation as well as the impulse approximation. Some channels have ratios of order $10^{-4}$: $Br(B^+\to\bar D^0(2S)\ell^+{\nu_\ell})\times Br(\bar D^0(2S)\to \bar D^{*}\pi)\approx(4.9\pm4.0)\times10^{-4}$, $Br(B^0\to D^-(2S)\ell^+{\nu_\ell})\times Br(D^-(2S)\to \bar D^{*}\pi)\approx(4.4\pm3.4)\times10^{-4}$. These channels could be measured by the current B-factories. For $D_s(2S)$, we also obtain a relative large ratio: $Br(B_s^0\to D_s^-(2S)\ell^+{\nu_\ell})\times Br(D_s^-(2S)\to \bar D^{*}\bar K)\approx (9.9\pm14.9)\times10^{-4}$. Although there are discrepancies of the full decay width between the theoretical predictions of ${D}^0(2S)$ and experimental results of $D(2550)^0$, the new detected state $D(2550)^0$ is very likely the ${D}^0(2S)$ state.
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