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Search Results: 1 - 10 of 189180 matches for " WANG Hong-yu "
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Effects on Strengths of Cement Mortar When Using Incinerator Bottom Ash as Fine Aggregate  [PDF]
Min-Jen Yang, Hong-Yu Wang, Hong-Yu Wang
World Journal of Engineering and Technology (WJET) , 2014, DOI: 10.4236/wjet.2014.23B007

The main purpose of this paper is to study the feasibility of using the Incinerator bottom ash fine aggregate to replace natural fine aggregate in the cement mortar products. The research adopts high cement content mortar to conduct the experiment, in which the weight ratio of cement/aggregate is 1/2. The experiment uses Incinerator bottom ash fine aggregates, which passes through #16 sieve, and natural sand of the same size as the aggregate, and separates mortar specimens in- to two main categories based on different W/C ratio. Moreover, different proportions of furnace slag and F-class are used to replace a portion of cement so as to explore the influence on strength of Incinerator bottom ash aggregates mortar by adding the two admixtures. The study shows that, based on the 1:2 cement/aggregate weight ratio, Incinerator bottom ash fine aggregates mortar, unit weight around 1.8 g/cm3, is 20% lighter natural fine aggregate mortar, unit weight around 2.2 g/cm3. The Incinerator bottom ash fine aggregates mortar can only reach 60%-70% the compressive strength of natural fine aggregates mortar. Direct tensile strength and flexural tensile strength tests are 15% and 30% of compressive strength respectively, due to the irregular strength development, which does not follow general concepts, such as low W/C ratio and mineral admixtures will not necessarily help in strength development in Incinerator bottom ash fine aggregates mortar.

Spin-polarized transport in a normal/ferromagnetic/normal zigzag graphene nanoribbon junction

Tian Hong-Yu,Wang Jun,

中国物理 B , 2012,
Abstract: We investigate the spin-dependent electron transport in single and double normal/ferromagnetic/normal zigzag graphene nanoribbon (NG/FG/NG) junctions. The ferromagnetism in the FG region originates from the spontaneous magnetization of the zigzag graphene nanoribbon. It is shown that when the zigzag-chain number of the ribbon is even and only a single transverse mode is actived, the single NG/FG/NG junction can act as a spin polarizer and/or a spin analyzer because of the valley selection rule and the spin-exchange field in the FG, while the double NG/FG/NG/FG/NG junction exhibits a quantum switching effect, in which the on and the off states switch rapidly by varying the cross angle between two FG magnetizations. Our findings may shed light on the application of magnetized graphene nanoribbons to spintronics devices.
Preparation of PFS coagulant by sectionalized reactor
CHANG Qing,WANG Hong-yu,
,WANG Hong-yu

环境科学学报(英文版) , 2002,
Abstract: The oxidation rate of ferrous sulfate is investigated for the preparation of polyferric sulfate(PFS) coagulant. It is proved that this reaction is zero order with respect to Fe 2+ , first order with respect to NO 2(g), and first order with respect to the interface area between gas phase and liquid phase. According to this mechanism, sectionalized reactor(SR) is used in place of traditional reactor(TR), and the liquid of reaction mixture is recycled by pump. As a result, not only the flow path of reaction liquid is prolonged, but also gas liquid contact area enlarged, and the reaction distinctly accelerated, compared with traditional reactor. The effects of parameters including temperature, acidity and others on the reaction rate are also discussed.
Implicit and electrostatic Particle-in-cell/Monte Carlo model in two dimensional and axisymmetric geometry I: analysis of numerical techniques
Hong-yu Wang,Wei Jiang,You-nian Wang
Physics , 2010, DOI: 10.1088/0963-0252/19/4/045023
Abstract: We developed an implicit Particle-in-cell/Monte Carlo model in two-dimensional and axisymmetric geometry for the simulations of the radio-frequency discharges, by introducing several numerical schemes which include variable weights, multigrid field solver, etc. Compared to the standard explicit models, we found that the computational efficiency is significantly increased and the accuracy is still kept. Numerical schemes are discussed and benchmark results are shown. The code can be used to simulate practical reactors.
A modified projection method for linear feasibility problems

Yi-Ju Wang,Hong-Yu Zhang,

国际自动化与计算杂志 , 2009,
Abstract: In this paper, we present a modified projection method for the linear feasibility problems (LFP). Compared with the existing methods, the new method adopts a surrogate technique to obtain new iteration instead of the line search procedure with fixed stepsize. For the new method, we first show its global convergence under the condition that the solution set is nonempty, and then establish its linear convergence rate. Preliminary numerical experiments show that this method has good performance.
Ping Li,Hai Wang,Jian Dong,Hong-Yu Chen
Acta Crystallographica Section E , 2012, DOI: 10.1107/s1600536812032886
Abstract: The molecule of the title compound, C12H14Cl2O2, lies about an inversion center. The six-membered ring is almost planar, with the largest deviation from the least-squares plane being 0.014 (4) . The molecular conformation is stabilized by a weak intramolecular C—H...O hydrogen bond. In the crystal, molecules are packed into stacks along the c-axis direction, with an intercentroid separation of 4.811 (2) . Neighboring molecules within the stack are related by the c-glide plane.
A numerical simulation of the backward Raman amplifying in plasma
Wang Hong-Yu,Huang Zu-Qia
Physics , 2005,
Abstract: This paper describe a numerical simulation method for the interaction between laser pulses and low density plasmas based on hydrodynamic approximation. We investigate Backward Raman Amplifying (BRA) experiments and their variants. The numerical results are in good agreement with experiments.
Study on immobilization of Acidithiobacillus ferrooxidans using PVA-Ca(NO3)2 method

WANG Yu-jian,LI Hong-yu,

微生物学报 , 2006,
Abstract: A new cell immobilization technique utilizing the complex of PVA solution and sodium alginate solution as entrapment medium is reported. The mixture of Acidithiobacillus ferrooxidans suspension and the entrapment complex were extruded into the solution of Ca(NO3)2 (1% - 5%) to form beads, then the beads were frozen at -20 degrees C for 1d and thawed at room temperature. This method can simultaneously eliminate the agglomeration of PVA beads and the biological toxicity of H3 BO31. A maximum oxidation rate of 2.45g Fe2+ /(L x h) was achieved in batch cultures by this immobilized cells. In addition, the operation of this new technique is very simple, and the gelation solution (calcium nitrate) used is of low toxicity and very cheap. Moreover, the mechanical strength and the oxidation activity of the beads obtained by this technique are better than those obtained by the other methods. So its application on an industrial scale would be more practicable.
Light-induced evaporative cooling in a magneto-optical trap

Ma Hong-Yu,Cheng Hua-Dong,Wang Yu-Zhu,Liu Liang,

中国物理 B , 2008,
Abstract: This paper presents an experimental demonstration of light-induced evaporative cooling in a magneto-optical trap. An additional laser is used to interact with atoms at the edge of the atomic cloud in the trap. These atoms get an additional force and evaporated away from the trap by both the magnetic field and laser fields. The remaining atoms have lower kinetic energy and thus are cooled. It reports the measurements on the temperature and atomic number after the evaporative cooling with different parameters including the distance between the laser and the centre of the atomic cloud, the detuning, the intensity. The results show that the light-induced evaporative cooling is a way to generate an ultra-cold atom source.
Face recognition with Gabor texture features

YANG Hong-yu,YU Lei,WANG Sen,

计算机应用研究 , 2011,
Abstract: 为了降低人脸Gabor特征的维数,提出了一种新的基于Gabor幅值的纹理表征(GMTR)方法用于人脸识别。GMTR由伽玛分布(ΓD)拟合Gabor幅值的分布来刻画,拟合的ΓD参数作为纹理特征。在FERET和Yale人脸库上的实验结果显示GMTR的识别性能优于传统的Gabor幅值特征,表明纹理特征具有更强的鉴别力。
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