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Search Results: 1 - 10 of 132148 matches for " ZHANG Fu zhi "
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Shear Elastic Modulus on Patellar Tendon Captured from Supersonic Shear Imaging: Correlation with Tangent Traction Modulus Computed from Material Testing System and Test–Retest Reliability
Zhi Jie Zhang, Siu Ngor Fu
PLOS ONE , 2013, DOI: 10.1371/journal.pone.0068216
Abstract: Characterization of the elastic properties of a tendon could enhance the diagnosis and treatment of tendon injuries. The purpose of this study was to examine the correlation between the shear elastic modulus on the patellar tendon captured from a Supersonic Shear Imaging (SSI) and the tangent traction modulus computed from a Material testing system (MTS) on 8 fresh patellar pig tendons (Experiment I). Test–retest reliability of the shear elastic modulus captured from the SSI was established in Experiment II on 22 patellar tendons of 11 healthy human subjects using the SSI. Spearman Correlation coefficients for the shear elastic modulus and tangent traction modulus ranged from 0.82 to 1.00 (all p<0.05) on the 8 tendons. The intra and inter-operator reliabilities were 0.98 (95% CI: 0.93–0.99) and 0.97 (95% CI: 0.93–0.98) respectively. The results from this study demonstrate that the shear elastic modulus of the patellar tendon measured by the SSI is related to the tangent traction modulus quantified by the MTS. The SSI shows good intra and inter-operator repeatability. Therefore, the present study shows that SSI can be used to assess elastic properties of a tendon.
Description of the FDML Laser with Quasi-steady State Model of the SOA  [PDF]
Zhi Wang, Limei Zhang, Lanlan Liu, Zhenchao Sun, Yingfeng Liu, Fu Wang
Optics and Photonics Journal (OPJ) , 2013, DOI: 10.4236/opj.2013.32B015
Abstract:

Experiments and simulations demonstrate that an SOA-based ring cavity can operate as a tunable laser, wavelength- swept laser or Fourier-domain-mode-locking laser according to the relation between the roundtrip frequency and the sweeping frequency of the filter.

Ultra-Wideband Cavity-Backed Bowtie Antenna for Pattern Improvement
Zhi-Ya Zhang;Shaoli Zuo;Xiaolu Zhang;Guang Fu
PIER Letters , 2013, DOI: 10.2528/PIERL12110909
Abstract: The design and ultra-wideband performance of a cavity-backed bowtie antenna with the parasitic dipole and parasitic circular ring is presented. Besides the elliptical bowtie dipole and the taper feeding microstrip for obtaining ultra-wideband impedance characteristics, the parasitic dipole and parasitic circular ring to effectively improve the radiation pattern can be used for obtaining the stable broadside unidirectional radiation patterns. An ultra-wideband impedance characteristic of about 118.2% for VSWR ≤ 2 ranging from 2.75-10.7 GHz is achieved. A unidirectional radiation pattern, a stable peak gain of around 7.4-10.8 dBi and low cross polarization over the whole operating band are also produced. A prototype has been fabricated and tested, and the experimental results validate the design procedure.
Synchronization speed of identical oscillators on community networks

Zhang Zhi,Fu Zhong-Qian,Yan Gang,

中国物理 B , 2009,
Abstract: Synchronizability of complex oscillators networks has attracted much research interest in recent years. In contrast, in this paper we investigate numerically the synchronization speed, rather than the synchronizability or synchronization stability, of identical oscillators on complex networks with communities. A new weighted community network model is employed here, in which the community strength could be tunable by one parameter $\delta$. The results showed that the synchronization speed of identical oscillators on community networks could reach a maximal value when $\delta$ is around Synchronizability of complex oscillators networks has attracted much research interest in recent years. In contrast, in this paper we investigate numerically the synchronization speed, rather than the synchronizability or synchronization stability, of identical oscillators on complex networks with communities. A new weighted community network model is employed here, in which the community strength could be tunable by one parameter $\delta$. The results showed that the synchronization speed of identical oscillators on community networks could reach a maximal value when $\delta$ is around $0.1$. We argue that this is induced by the competition between the community partition and the scale-free property of the networks. Moreover, we have given the corresponding analysis through the second least eigenvalue $\lambda_2$ of the Laplacian matrix of the network which supports the previous result that the synchronization speed is determined by the value of $\lambda_2$.
A Shorted Magneto-Electric Dipole with Γ-Shaped Strip Feed
Zhi-Ya Zhang;Guang Fu;Shaoli Zuo;Tao Ran
PIER Letters , 2009, DOI: 10.2528/PIERL09100804
Abstract: A wideband unidirectional antenna composed of a magneto-electric dipole with Γ-shaped feed is designed. Simulated and measured results are presented. It achieves an impedance bandwidth of 84% for VSWR ≤ 2 ranging from 2.05GHz to 5.05GHz, stable peak gain of around 5 dBi, unidirectional radiation patterns and low cross polarization over the whole operating band. It is sufficient for accommodating recent wireless communication services such as 3G, WiFi, WiMax, Bluetooth, WLAN and Zigbee, etc.
A Compact CPW-FED Monopole Antenna with Triple Bands for WLAN/Wimax Applications
Liang Dong;Zhi-Ya Zhang;Wang Li;Guang Fu
PIER Letters , 2013,
Abstract: A novel compact coplanar waveguide (CPW)-fed printed antenna with triple bands for WLAN and WiMAX applications is presented. By using a parasitic circular patch, a pair of symmetrical inverted-L strips and a 50-Ω transformer, the antenna can effectively provide a good input impedance matching. The tuning effects of the ground size, the parasitic circular patch and the symmetrical inverted-L strips to the resonance and matching condition are then examined, and the prototype of the proposed antenna is further fabricated and measured. The experimental and numerical results exhibit that the antenna has impedance bandwidth for ≤-10 dB of 2.32-2.80 GHz, 3.06-4.13 GHz and 5.03-6.04 GHz, which can cover both the WLAN 2.4/5.2/5.8 GHz bands and the WiMAX 2.5/3.5/5.5 GHz bands. Also, a stable monopole-like radiation pattern and an average antenna gain of 3.06 dBi across the operating bands have been obtained.
Study on character of geophone array in seismic exploration
地震勘探中检波器组合特性研究

ZHANG Zhi,LI Fei,HUANG Zhi-fang,ZHANG Fu-ming,
张智

地球物理学进展 , 2009,
Abstract: Based on the theory and method of geophone array, we analyze the question of geophone array under two conditions. Previous researches are little on this issue, but in fact, it affects greatly the resolution of seismic data. Through the calculation of the model, we find that the number and spacing of the geophone array under different ground conditions impose large effect on the quality and resolution and precision of seismic data seen from the frequency curves.
Preparation and Characterization of Apatite Coated Rutile TiO2 Composite Powders
SHI Fu-Zhi,ZHANG Qing-Hong,LI Yao-Gang,WANG Hong-Zhi
无机材料学报 , 2009, DOI: 10.3724/sp.j.1077.2009.00893
Abstract: The composite of nanocrystalline apatite coated rutile TiO2 was prepared by soaking TiO2 nanosized powders into the simulated body fluid (SBF) at 37 or the different duration times. The as-prepared samples were characterized by X-ray diffraction (XRD), scanning electron microscope (SEM), transmission electron microscope (TEM), higha2resolution transmission electron microscope (HRTEM), energy dispersive X-ray (EDX), fourier transform infrared (FTIR) spectroscope, inductively coupled plasma atomic emission spectrometer (ICP-AES) and N2 adsorption measurements. XRD result shows that the content of the apatite coated on the rutile TiO2 increases with prolonging the soaking time in the SBF. It is demonstrated that composite powders have included some apatite through the absorption peaks of the O-H and PO43-of the apatite in the FTIR spectrum. ICP-AES result shows that Ca and P concentrations decrease with prolonging the soaking time in SBF. It is evident from the TEM and EDX that there is some apatite coated on the surfaces of the rutile TiO2. HRTEM result indicates that the interplanar spacing of (211) of the apatite is 0.27nm and the diameter of apatite nanoparticles is about 40nm.
Super fidelity and related metric
Zhi-Hao Ma,Fu-Lin Zhang,Zhi-Hua Chen,Jing-Ling Chen
Physics , 2008,
Abstract: We report a new metric of quantum states. This metric is build up from super-fidelity, which has deep connection with the Uhlmann-Jozsa fidelity and plays an important role in quantifying entanglement. We find that the new metric possess some interesting properties.
Adsorption and Reaction of CO on (100) Surface of SrTiO3 by Density Function Theory Calculation

YUN Jiang-Ni,ZHANG Zhi-Yong,ZHANG Fu-Chun,

中国物理快报 , 2008,
Abstract: Adsorption and reaction of CO on two possible terminations of SrTiO3 (100) surface are investigated by the first-principles calculation of plane wave ultrasoft pseudopotential based on the density function theory. The adsorption energy, Mulliken population analysis, density of states (DOS) and electronic density difference of CO on SrTiO3 (100) surface, which have never been investigated before as far as we know are performed. The calculated results reveal that the Ti-CO orientation is the most stable configuration and the adsorption energy (0.449eV) is quite small. CO molecules adsorb weakly on the SrTiO3 (100) surface, there is predominantly electrostatic attraction between CO and the surface rather than a chemical bonding mechanism.
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