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Search Results: 1 - 10 of 41091 matches for " Jun Zou "
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Measurement of Cooling Effect of Building Environment Greening  [PDF]
Qinghai Luo, Jun Zou, Xiufei Yang
Journal of Environmental Protection (JEP) , 2012, DOI: 10.4236/jep.2012.37068
Abstract: A series of measurements showed that community greening and trees shading had different degree of cooling effect. The cooling effect of wall greening was related to factors such as heat storage capacity and the orientation of the wall, climatic conditions. As compared to the heat reduced by sheltering the solar radiation, the heat absorbed by plant transpiration had greater cooling contribution. Comprehensive considering environment, technology and economics factors, the building district greening should take trees as the priority. The trees shading can significantly drop indoor temperature and temperature fluctuation, also created better condition for night-time natural ventilation.
A Direct Sampling Method for Inverse Scattering Using Far-Field Data
Jingzhi Li,Jun Zou
Physics , 2012,
Abstract: This work is concerned with a direct sampling method (DSM) for inverse acoustic scattering problems using far-field data. The method characterizes some unknown obstacles, inhomogeneous media or cracks, directly through an indicator function computed from the measured data. Using one or very few incident waves, the DSM provides quite reasonable profiles of scatterers in time-harmonic inverse acoustic scattering without a priori knowledge of either the physical properties or the number of disconnected components of the scatterer. We shall first derive the DSM using far-field data, then carry out a systematic evaluation of the performances and distinctions of the DSM using both near-field and far-field data. The numerical simulations are shown to demonstrate interesting and promising potentials of the DSM: a) ability to identify not only medium scatterers, but also obstacles, and even cracks, using measurement data from one or few incident directions, b) robustness with respect to large noise, and c) computational efficiency with only inner products involved.
A Multilevel Sampling Algorithm for Locating Inhomogeneous Media
Keji Liu,Jun Zou
Mathematics , 2012, DOI: 10.1088/0266-5611/29/9/095003
Abstract: In the reconstruction process of unknown multiple scattering objects in inverse medium scattering problems, the first important step is to effectively locate some approximate domains that contain all inhomogeneous media. Without such an effective step, one may have to take a much larger computational domain than actually needed in the reconstruction of all scattering objects, thus resulting in a huge additional computational efforts. In this work we propose a simple and efficient multilevel reconstruction algorithm to help locate an accurate position and shape of each inhomogeneous medium. Then other existing effective but computationally more demanding reconstruction algorithms may be applied in these initially located computational domains to achieve more accurate shapes of the scatter and the contrast values over each medium domain. The new algorithm exhibits several strengths: robustness against noise, requiring less incidences, fast convergence, flexibility to deal with scatterers of special shapes, and advantages in computational complexity.
Convergence of an Adaptive Finite Element Method for Distributed Flux Reconstruction
Yifeng Xu,Jun Zou
Mathematics , 2013,
Abstract: We shall establish the convergence of an adaptive conforming finite element method for the reconstruction of the distributed flux in a diffusion system. The adaptive method is based on a posteriori error estimators for the distributed flux, state and costate variables. The sequence of discrete solutions produced by the adaptive algorithm is proved to converge to the true triplet satisfying the optimality conditions in the energy norm and the corresponding error estimator converges to zero asymptotically.
Randomized Algorithms for Large-scale Inverse Problems with General Regularizations
Hua Xiang,Jun Zou
Mathematics , 2014,
Abstract: We shall investigate randomized algorithms for solving large-scale linear inverse problems with general regularizations. We first present some techniques to transform inverse problems of general form into the ones of standard form, then apply randomized algorithms to reduce large-scale systems of standard form to much smaller-scale systems and seek their regularized solutions in combination with some popular choice rules for regularization parameters. Then we will propose a second approach to solve large-scale ill-posed systems with general regularizations. This involves a new randomized generalized SVD algorithm that can essentially reduce the size of the original large-scale ill-posed systems. The reduced systems can provide approximate regularized solutions with about the same accuracy as the ones by the classical generalized SVD, and more importantly, the new approach gains obvious robustness, stability and computational time as it needs only to work on problems of much smaller size. Numerical results are given to demonstrated the efficiency of the algorithms.
MtsR, an Iron-Dependent Regulator in Streptococcus iniae  [PDF]
Jun Wang, Peng Wang, Yanyan Qin, Lili Zou
Agricultural Sciences (AS) , 2018, DOI: 10.4236/as.2018.95042
Abstract: Streptococcus iniae (S. iniae) is a major pathogen that is capable of resulting severe economic loss to cultured fish. Steadily iron availability from micro-environment is an important virulence factor for pathogens, and S. iniae encodes the iron-transporter MtsABC to accomplish heme utilization, but very little was known about the mechanisms involved in regulating and maintaining iron balance in S. iniae. In this study, the role of a putative iron-dependent transcriptional regulator MtsR was investigated, and the results showed that MtsR regulated the expression of iron-transport mtsABC to control iron homeostasis in S. iniae.
Magnetocaloric and barocaloric effects in a Gd5Si2Ge2 compound

Zou Jun-Ding,

中国物理 B , 2012,
Abstract: The first-order phase transition in Gd5Si2Ge2 is sensitive to both magnetic field and pressure. It may indicate that the influences of the magnetic field and the pressure on the phase transition are virtually equivalent. Moreover, theoretical analyses reveal that the total entropy change is almost definite at a certain Curie temperature no matter whether the applied external field is a magnetic field or a pressure. The entropy change curve can be broadened dramatically under pressure, and the refrigerant capacity is improved from 284.7 J/kg to 447.0 J/kg.
Comparison of ZnO Films Grown on before- and after-vapor Transport Equilibration (VTE) LiAlO2 Substrates by Pulsed Laser Deposition (PLD)
Comparison of ZnO Films Grown on before- and after-vapor Transport Equilibration (VTE) LiAlO2 Substrates by Pulsed Laser Deposition (PLD)

Jun ZOU,Shengming ZHOU,Jun XU,
Jun
,ZOU,Shengming,ZHOU,Jun,XU

材料科学技术学报 , 2006,
Abstract: About Ф45 mm LiAlO2 single crystal was grown by Czochralski (Cz) technique. However, the full-width at half-maximum (FWHM) value was high to 116.9 arcsec. After three vapor transport equilibration (VTE) processes,we can obtain high-quality LiAlO2 slice with the FWHM value of 44.2 arcsec. ZnO films were fabricated on as-grown slices and after-VTE ones by pulsed laser deposition (PLD). It was found that ZnO films on the two slices have similar crystallinity, optical transmittance and optical band gap at room temperature. These results not only show that LAO substrate is suitable for ZnO growth, but also prove that the crystal quality of LAO substrate slightly affects the structural and optical properties of ZnO film.
Numerical simulation of a horizontal sedimentation tank considering sludge recirculation

Wei Zhang,Zhihong Zou,Jun Sui,

环境科学学报(英文版) , 2010,
Abstract: Most research conducted on the concentration distribution of sediment in the sedimentation tank does not consider the role of the suction dredge. To analyze concentration distribution more accurately, a suspended sediment transportation model was constructed and the velocity field in the sedimentation tank was determined based on the influence of the suction dredge. An application model was then used to analyze the concentration distribution in the sedimentation tank when the suction dredge was fixed, with results showing that distribution was in accordance with theoretical analysis. The simulated value of the outlet concentration was similar to the experimental value, and the trends of the isoconcentration distribution curves, as well as the vertical distribution curves of the five monitoring sections acquired through simulations, were almost the same as curves acquired through experimentation. The di erences between the simulated values and the experimental values were significant.
Study a0(980)-f0(980) mixing from a0(980) -> f0(980) transition
Wu, Jia-Jun;Zou, B. S.
High Energy Physics - Phenomenology , 2008, DOI: 10.1103/PhysRevD.78.074017
Abstract: Various processes have been proposed previously to study a0(980)-f0(980) mixing through f0(980)->a0(980) transition. Here we investigate in detail the difference between a0(980)->f0(980) and f0(980)->a0(980) transitions. It is found that the a0(980)->f0(980) transition can provide additional constrains to the parameters of a0(980) and f0(980) mesons. Proposal is made to study a0(980)-f0(980) mixing from chi_{c1}->pi^0 a0(980) -> pi^0 f0(980) reaction at the upgraded Beijing electron positron collider with the BESIII detector.
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