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Search Results: 1 - 10 of 36869 matches for " Jiachang Zhao "
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Carbonization of Chlorinated Organic Residual Liquid for Energy Source Generation  [PDF]
Yongquan Ge, Wenqi Zhang, Gang Xue, Jiachang Zhao
Journal of Materials Science and Chemical Engineering (MSCE) , 2015, DOI: 10.4236/msce.2015.312014
Abstract: Chlorinated organic residual liquid is produced from the distillation process of new refrigerants production. It is difficult to be treated by traditional water treatment process and incineration process. In this study, a carbonization process at atmospheric pressure was used to convert this residual liquid to carbonaceous product and organic gas in 2 h at 230℃ or 260℃. The carbonaceous product was characterized by scanning electron microscope, Fourier-transform infrared spectrometer and thermo gravimetric analysis. The element composition and the high heat value of these products were similar to anthracite and lignite, respectively, showing that they could be used as alternative fuels. The components of organic gas were analyzed using gas chromatography-mass spectrometry and the gas had potential for incineration.
Quenching of fluorescence in membrane protein by hypocrellin B
Jiachang Yue,Suzhen Pang
Science China Life Sciences , 1997, DOI: 10.1007/BF02882048
Abstract: The hypocrellin B (HB) was used as a fluorescence quencher to study the basic physical charactcristics of HB in membrane systems, including the diffusion speed of quencher from aqueous phase into membrane phase, the partition coefficient (P) of quenchtr between membrane and water, and the fluorescence quenching constant of protein (Ksv; Kq,). The experimental results show that the quenching of fluorescence in membrane protein by HB can be determined by the principle of dynamic quenching. The experimental process of fluorescence quenching was observed in detail by using the ESR technique. The signal of HB- was found to arise from an electron transfer from excited trytophan to HB.
STUDY ON THE ENHANCEMENT OF PHOTOREFRECTIVE EFFECT OF Mg: Fe: LiNbO_3 CRYSTAL
Mg:Fe:LinbO_3晶体光折变增强效应的研究

Li Minghu,Wang Jiachang,Zhao Yiequan,
李铭华
,王家昌,赵业权,韩爱珍,高元恺

红外与毫米波学报 , 1995,
Abstract: With MgO and Fe2O3 doped into LiNbO3 ,the Mg: Fe: LiNbO3 crystal was grown. The highest exponential gain coefficient (r=80cm-1 ) was measured in a thin Mg :Fe: LiNbO3 sample,of which the thickness was 0. 2mm. The sample showed high gain coefficient within a wide angular range. These features were explained by the effect of light crawling, which originated from light scattering with large angles. The response speed and the ability of anti-scattering of Mg:Fe:LiNbO3 were improved as compased with Fe:LiNbO3. The once iteration of output in real-time holographic associative memory was implemented by using Mg:Fe:LiNbO3 as a photorefractive amplifier.
High sensitive and rapid responsive n-type Si: Au sensor for monitoring breath rate  [PDF]
Xuelan Hu, Jiachang Liang, Xing Li, Yue Chen, Chao Zou, Sheng Liu, Xin Chen
Natural Science (NS) , 2010, DOI: 10.4236/ns.2010.210130
Abstract: 125 μm-breath sensor with high sensitivity and rapid response was prepared by using n-type Si: Au material. Its sensitivity coefficient and time constant were 4 V.sec / L and 38 msec, respec-tively. Its working principle was based on ano- malous resistance effect, which not only increa- sed the sensitivity, but also reduced its time con-stant greatly. Its signal processing system can select the breath signals and work stably. Therefore, the small changes of breath system can be measured and, especially, patient’s breath rate can be monitored at a distance.
ON POSITIVE SYMMETRIZABLE MATRICES AND PRE-SYMMETRY ITERATION ALGORITHMS
正定可对称化矩阵与预对称迭代算法

SUN Jiachang,
孙家昶

计算数学 , 2000,
Abstract: Second order elliptic equation is a class of mathematical model for scientific computing, such as convex-diffusion, oil-reservoir simulation, etc. Based on intrinsic symmetrizable property, a new concept on positively symmetrizable matrix is proposed in this paper. We point that for such kind of equation systems, it is possible to adopt special preconditioning CG algorithm, e.g. 1]-3], instead of the usual iteration procedure for general non-symmetry systems, such as GMRES 3]-4] ) BiCGSTAB 5]. Numerical tests show the new algorithm is effective for solving this kind of second order elliptic discrete systems.
Discrete Fourier Analysis and Chebyshev Polynomials with G2 Group
Huiyuan Li,Jiachang Sun,Yuan Xu
Symmetry, Integrability and Geometry : Methods and Applications , 2012,
Abstract: The discrete Fourier analysis on the 30°-60°-90° triangle is deduced from the corresponding results on the regular hexagon by considering functions invariant under the group G2, which leads to the definition of four families generalized Chebyshev polynomials. The study of these polynomials leads to a Sturm-Liouville eigenvalue problem that contains two parameters, whose solutions are analogues of the Jacobi polynomials. Under a concept of m-degree and by introducing a new ordering among monomials, these polynomials are shown to share properties of the ordinary orthogonal polynomials. In particular, their common zeros generate cubature rules of Gauss type.
Discrete Fourier analysis, Cubature and Interpolation on a Hexagon and a Triangle
Huiyuan Li,Jiachang Sun,Yuan Xu
Mathematics , 2007,
Abstract: Several problems of trigonometric approximation on a hexagon and a triangle are studied using the discrete Fourier transform and orthogonal polynomials of two variables. A discrete Fourier analysis on the regular hexagon is developed in detail, from which the analysis on the triangle is deduced. The results include cubature formulas and interpolation on these domains. In particular, a trigonometric Lagrange interpolation on a triangle is shown to satisfy an explicit compact formula, which is equivalent to the polynomial interpolation on a planer region bounded by Steiner's hypocycloid. The Lebesgue constant of the interpolation is shown to be in the order of $(\log n)^2$. Furthermore, a Gauss cubature is established on the hypocycloid.
Cubature formula and interpolation on the cubic domain
Huiyuan Li,Jiachang Sun,Yuan Xu
Mathematics , 2008,
Abstract: Several cubature formulas on the cubic domains are derived using the discrete Fourier analysis associated with lattice tiling, as developed in \cite{LSX}. The main results consist of a new derivation of the Gaussian type cubature for the product Chebyshev weight functions and associated interpolation polynomials on $[-1,1]^2$, as well as new results on $[-1,1]^3$. In particular, compact formulas for the fundamental interpolation polynomials are derived, based on $n^3/4 +\CO(n^2)$ nodes of a cubature formula on $[-1,1]^3$.
Discrete Fourier analysis with lattices on planar domains
Huiyuan Li,Jiachang Sun,Yuan Xu
Mathematics , 2009,
Abstract: A discrete Fourier analysis associated with translation lattices is developed recently by the authors. It permits two lattices, one determining the integral domain and the other determining the family of exponential functions. Possible choices of lattices are discussed in the case of lattices that tile $\RR^2$ and several new results on cubature and interpolation by trigonometric, as well as algebraic, polynomials are obtained.
Discrete Fourier Analysis and Chebyshev Polynomials with $G_2$ Group
Huiyuan Li,Jiachang Sun,Yuan Xu
Mathematics , 2012, DOI: 10.3842/SIGMA.2012.067
Abstract: The discrete Fourier analysis on the $30^{\degree}$-$60^{\degree}$-$90^{\degree}$ triangle is deduced from the corresponding results on the regular hexagon by considering functions invariant under the group $G_2$, which leads to the definition of four families generalized Chebyshev polynomials. The study of these polynomials leads to a Sturm-Liouville eigenvalue problem that contains two parameters, whose solutions are analogues of the Jacobi polynomials. Under a concept of $m$-degree and by introducing a new ordering among monomials, these polynomials are shown to share properties of the ordinary orthogonal polynomials. In particular, their common zeros generate cubature rules of Gauss type.
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