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Search Results: 1 - 10 of 17399 matches for " Yajun Fu "
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Electronic and Optical Properties of Rocksalt CdO: A first-Principles Density-Functional Theory Study  [PDF]
Gang Yao, Xinyou An, Hongwen Lei, Yajun Fu, Weidong Wu
Modeling and Numerical Simulation of Material Science (MNSMS) , 2013, DOI: 10.4236/mnsms.2013.31B005
Abstract: The structural, electronic and optical properties of rocksalt CdO have been studied using the plane-wave-based pseudo-potential density functional theory within generalized gradient approximation. The calculated lattice parameters are in agreement with previous experimental work. The band structure, density of states, and Mulliken charge population are obtained, which indicates that rocksalt CdO having the properties of a halfmetal due to an indirect band gap of -0.51eV. The mechanical properties show that rocksalt CdO is mechanically stable, isotropic and malleable. Significantly, we propose a correct value for ε1(0) of about 4.75, which offers theoretical data for the design and application for rocksalt CdO in optoelectronic materials.
The Application Research of “The Kite” Law in Chinese Universities Logistics Reform  [PDF]
Yajun Yin
Creative Education (CE) , 2014, DOI: 10.4236/ce.2014.514142
Abstract:

“The Kite Management Philosophy” tells us: Before making change, an organization should fully understand the surrounding environment, prepare related factors and develop a suitable system. After the conditions are ripe, it must boldly implement the organizational goals and be good at controlling. The current biggest problem of obsessing and obstacle of the Chinese universities logistics reform is not properly handling the relationship between logistics public welfare and marketability. The dependence relationship of the two aspects is like a flying kite—more public welfare means taking back and more marketability means flying off. Managers should follow “The Kite Management Philosophy”, timely release and recycle the cord according to the actual situation. They should dare to reform, be good at controlling and have the courage to innovate.

Designing of Hot Strip Rolling Mill Control System  [PDF]
Yajun Wu
World Journal of Engineering and Technology (WJET) , 2016, DOI: 10.4236/wjet.2016.43040
Abstract: Aimed at the complex demand of hot strip rolling mill in practicing, the configuration of the coiler and the technological process is analyzed. The arithmetic of coiling tension and the control process is introduced. The frame of the tension adjusting system is given. The coiler control system hardware is designed. The system is designed scientifically with steady control and meets demand of the market.
2,2′-(p-Phenylenedimethylene)bis(propane-1,3-diol)
Yajun Gao,Haitao Xi,Xiaoqiang Sun,Yongsheng Fu
Acta Crystallographica Section E , 2009, DOI: 10.1107/s1600536808041688
Abstract: The molecule of the title compound, C14H22O4, is centrosymmetric. In the crystal, the molecules are linked through O—H...O hydrogen bonds into a three-dimensional network.
The Catalytic Wet Air Oxidation Reaction of Acetic Acid with Ti-Ce Series Catalyst
Ti-Ce系列催化剂上乙酸的催化湿式氧化反应

Zhanpeng Jiang,Hongxiang Fu,Yajun Tan,
蒋展鹏
,付宏祥,谭亚军

环境科学 , 2002,
Abstract: The influence factors and reaction mechanism during the catalytic wet air oxidation of acetic acid with Ti-Ce series catalyst was investigated in this paper. The results show that the reaction was influenced by the catalyst load, the reaction temperature, the pH of the reaction system and the partial pressure of oxygen. More than 90% removal efficiency of acetic acid (as COD) can be obtained at the reaction conditions as follow: temperature 230 degrees C, oxygen partial pressure 2-2.5 MPa, catalyst amount 5 g/L, initial pH of the system 3.0 and reaction time 1 h. With Ion Chromatography, the formic acid formed during the reaction process was detected. The formic was found during the wet air oxidation of acetic acid in the absence of catalyst, but can not be detected during the catalytic wet air oxidation process with Ti-Ce catalyst. It means that the presence of catalyst in the system not only improve the removal efficiency, but also change the oxidation pathway.
Spectral Structure of Electromagnetic Scattering on Arbitrarily Shaped Dielectric
Yajun Zhou
Physics , 2009,
Abstract: Spectral analysis is performed on the Born equation, a strongly singular integral equation modeling the interactions between electromagnetic waves and arbitrarily shaped dielectric scatterers. Compact and Hilbert--Schmidt operator polynomials are constructed from the Green operator of electromagnetic scattering on scatterers with smooth boundaries. As a consequence, it is shown that the strongly singular Born equation has a discrete spectrum, and that the spectral series $ \sum_\lambda|\lambda|^2|1+2\lambda|^4$ is convergent, counting multiplicities of the eigenvalues $ \lambda$. This reveals a shape-independent optical resonance mode corresponding to a critical dielectric permittivity $ \epsilon_r=-1$, which could be of practical interest in synthetic chemistry and materials science.
Distribution of Eigenvalues in Electromagnetic Scattering on an Arbitrarily Shaped Dielectric
Yajun Zhou
Physics , 2010,
Abstract: We study the distribution of eigenvalues for the Green operator occurring in the scattering of electromagnetic waves by an arbitrarily shaped dielectric medium. It is revealed that the totality of eigenvalues (counting multiplicities) can be enumerated as a sequence $ \{\lambda_s\}_{s=1}^N,N\leq\aleph_0$, with only two possible accumulation points $ \{0,-1/2\}$, and the following spectral series converges: $ \sum_{s=1}^N|\lambda_s|^2|1+2\lambda_s|^4<+\infty$.
Comments on "A note on optimal detection of a change in distribution," by Benjamin Yakir
Yajun Mei
Mathematics , 2006, DOI: 10.1214/009053606000000362
Abstract: The purpose of this note is to show that in a widely cited paper by Yakir [Ann. Statist. 25 (1997) 2117--2126, doi:10.1214/aos/1069362390], the proof that the so-called modified Shiryayev--Roberts procedure is exactly optimal is incorrect. We also clarify the issues involved by both mathematical arguments and a simulation study. The correctness of the theorem remains in doubt.
Sequential change-point detection when unknown parameters are present in the pre-change distribution
Yajun Mei
Mathematics , 2006, DOI: 10.1214/009053605000000859
Abstract: In the sequential change-point detection literature, most research specifies a required frequency of false alarms at a given pre-change distribution $f_{\theta}$ and tries to minimize the detection delay for every possible post-change distribution $g_{\lambda}$. In this paper, motivated by a number of practical examples, we first consider the reverse question by specifying a required detection delay at a given post-change distribution and trying to minimize the frequency of false alarms for every possible pre-change distribution $f_{\theta}$. We present asymptotically optimal procedures for one-parameter exponential families. Next, we develop a general theory for change-point problems when both the pre-change distribution $f_{\theta}$ and the post-change distribution $g_{\lambda}$ involve unknown parameters. We also apply our approach to the special case of detecting shifts in the mean of independent normal observations.
Spherical Couplings and Multiple Elliptic Integrals
Yajun Zhou
Mathematics , 2013,
Abstract: Various integrals over elliptic integrals are evaluated as couplings on spheres, resulting in some integral and series representations for the mathematical constants $\pi$, $G$ and $\zeta(3)$.
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