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A GENERALIZATION OF ROUTH-HURWITZCRITERION

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Systems Science and Mathematical sciences 1999年第1期12卷 45-48页

作者： YANG Xiaojing (department of Mathematics, Tsinghua university, Beijing 100084, china) 清华大学数学系北京

This paper presents a criterion for a polynomial to be non-unstable and for the calculation of the number of eigenvalues which have zero real parts and negative real *** generalizes the Routh-Hurwitz criterion and is ... 详细信息

关键词： Routh-Hurwitz criterion stable polynomial.

THE RELATIONSHIPS OF THREE ELEMENTARY CELLULAR AUTOMATA

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Journal of Systems Science & Complexity 2006年第1期19卷 128-136页

作者： Zhisong JIANG department of Mathematics East China University of Science and Technology Shanghai 200237 China

Limit language complexity of cellular automata which is first posed by S. Wolfram has become a new branch of cellular automata. In this paper, we obtain two interesting relationships between elementary cellular automata of rules 126, 146（182） and 18, and prove that if the limit language of rule. 18 is not regular, nor are the limit languages of rules 126 and 146（182）.

关键词： Cellular automata grammatical complexity limit language.

A Regression Analysis Model Based on Wavelet Networks

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Systems Science and Systems Engineering 2002年第1期11卷 123-128页

作者： XIONG Zheng-feng department of Mathematics, Zhejiang university, Hangzhou 3.0027, china department of Mathematics Zhejiang University Hangzhou 310027 China

In this paper, an approach is proposed to combine wavelet networks and techniques of regression analysis. The resulting wavelet regression estimator is well suited for regression estimation of moderately large dimensi... 详细信息

关键词： frame wavelet networks regression estimator

Melting Temperatures of Several Oxides Under Pressure

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Melting Temperatures of Several Oxides Under Pressure

High frequency of p53.intronic point mutations in laryngeal squamous cell carcinoma

International Conference on Aerospace Materials(ICAM 2006)

作者： S. Zhang and S. S. Jia Key Laboratory of Automobile Materials (jilin university), Ministry of Education, and department of Materials Science and Engineering, jilin university, {3. 13.025, china

The melting temperature-pressure phase diagram [Tm(P)-P] for corundum (Al2O3., wustite (FeO) and magnesium oxide (MgO) are predicted through the Clapeyron equation where the pressure-dependent volume difference is modeled by introducing the effect of surface stress induced pressure. The model prediction is found to be consistent with the present experimental results.

关键词： Phase transitions pressure-dependent temperature

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Progress in Natural Science:Materials International 2004年第7期 36-40页

作者： ZHAO Xu 1*, LI Fucai 1*, SONG Yutong 2, LI Yinghui 1, FU Weineng 1, XU Zhenming 3.and SUN Kailai 1(1. department of Medical Genetics, china Medical university, Shenyang 110001, china 2. department of Biochemistry and Molecular Biology, china Medical university, Shenyang 110001, china 3. department of Otolaryngology, No.463.Hospital of Air-Force, Shenyang 110001, china) department of Medical Genetics China Medical University Shenyang 110001 China department of Biochemistry and Molecular Biology China Medical University Shenyang 110001 China department of Otolaryngology No.463 Hospital of Air-Force Shenyang 110001 China

Intronic point mutations are rare and totally unknown for human laryngeal squamous cell carcinoma (LSCC). To explore the relationship of p53.gene intronic mutation to the development of human LSCC, DNA was extracted from both tumor tissues and matched normal tissues of 55 patients with LSCC in northeast of china. Polymerase chain reaction amplification-single strand conformational polymorphism (PCR-SSCP) combined with silver staining and DNA direct sequencing were used to detect mutations in exons 7～8 (p53.7 and p53.8) and introns 7～8 (p53.7 and p53.8) of p53.gene. The p53.7 mutation was detected in 17 out of 55 patients, and the p53.7 mutation in 21 patients. No mutation was found at p53.8 or p53.8 site. The difference between tumor group and paired normal group on the rates of both p53.7 and p53.7 mutations was statistically significant. The rate of p53.7 mutations in tumor tissue was higher than that of normal tissue, and so was that of p53.7. Sequence analysis revealed that most p53.7 mutations were at the nucleotides in the branch point sequence or the polypyrimidine tract in the 3.-splice acceptor site of the intron 7. The high incidence of p53.gene intronic mutation in LSCC indicates that genetic changes within the noncoding region of the p53.gene may serve as an alternative mechanism of activating the pathogenesis of human laryngeal squamous cell carcinoma. Mutations in the noncoding region of this gene should be further studied.

关键词： laryngeal squamous cell carcinoma p53.gene intronic mutation PCR-SSCP.

The GPS-gravimetry boundary value problem

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Science china earth sciences 2005年第3期48卷 398-405页

作者： YU Jinhai1,2 & ZHANG Chuanding2 1. Institute of Geodesy and Geophysics of Chinese Academy of sciences, Wuhan 43.077, china 2. Zhengzhou Information Engineering university, Zhengzhou 450052, china Institute of Geodesy and Geophysics of Chinese Academy of sciences Wuhan China Zhengzhou Information Engineering university Zhengzhou China

How to determine the earth’s external gravity field with the accuracy of O(T2) by making use of GPS data and gravity values measured on the earth’s surface is dealt with in this paper. There are two main steps: to extend these measured values on the earth’s surface onto the reference ellipsoid at first and then to seek for the integral solution of the external Neumann problem outside the ellipsoid. In addition, the corresponding judging criteria of accuracy to solve the GPS-gravity boundary value problem are established. The integral solution given in the paper not only contains all frequency-spectral information of the gravity field with the accuracy of O(T 2), but is also easily computed. In fact, the solution has great significance for both theory and prac- tice.

关键词： Neumann boundary value problem, integral solution, gravity disturbance.

Two-dimensional simulation of Poiseuille-Rayleigh-Bénard flows in binary fluids with Soret effect

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Progress in Natural Science:Materials International 2007年第12期17卷 1389-1396页

作者： Hu Jun1 and Yin Xieyuan2(1. Institute of Applied Physics and Computational Mathematics, Beijing 100088, china 2. department of Modern Mechanics, university of Science and Technology of china, Hefei 23.027, china) Institute of Applied Physics and Computational Mathematics Beijing 100088 China department of Modern Mechanics University of Science and Technology of China Hefei 230027 China

Poiseuille-Rayleigh-Bénard flows in binary fluids with Soret effect are directly simulated by a mixed finite element method. A temperature perturbation is used as an initial disturbed source for the basic parallel flows. The whole spatio-temporal evolution of the binary fluid flows is exhibited: initially only the disturbed mode with the wavenumber k=π is amplified while others are damped, and continuously the amplified mode grows further and the nonlinear effect becomes important; after a nonlinear evolution transition the flow system evolves finally into a periodic right traveling wave.

关键词： Poiseuille-Rayleigh-Bénard flow Soret effect through-flow.

PREPARATION OF Au/SULFONATED POLYSTYRENE CATALYSTS FOR LOW-TEMPERATURE CO OXIDATION

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Chinese Journal of Polymer Science 2001年第5期19卷 503-507页

作者： Shi-hua Wu Xiu-cheng Zheng Wei-ping Huang Shou-min Zhang Wei Wei department of Chemistry, Nankai university Tianjin 3.0071, china department of Chemistry Nankai University Tianjin 300071 China

Supported Au catalysts for low-temperature CO oxidation were prepared by solvated metal atom impregnation (SMAI) and conventional impregnation (Cl). X-ray photoelectron spectroscopy (XPS) investigations indicated that the elemental gold in all the samples was in the metallic state, XRD measurements showed that the mean diameters of Au particles prepared by SMAI were smaller than those prepared by Cl with the same gold content. Catalytic tests showed that the SMAI catalyst had higher CO oxidation activity than the CI catalyst with the same compositions. Both SMAI and Cl catalysts exhibited high activity in low temperature CO oxidation. Full CO conversion was obtained at 3.3.3.3..

关键词： CO oxidation gold catalysts solvated metal atom impregnations conventional impregnation sulfonated polystyrene

Recognition　of　Ophiolite　Belt　and　Granulite　in　Northern　Area　of　Mian－Lue，　Southern　Qinling，　china　and　Their　Implication

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Journal of earth Science 1994年第1期13卷 25-27页

作者： Xu Jifeng(department of Geology, china university of Geo{3., Wuhan 43.074)Zhang Benren Han Yinwen(department of Geochehastry, china university of Geo{3., Wuhan 43.074)

A ophiolite belt associated with the tectonic melange is recoghzed in northern area of Mian-Lue, southern Qinling. The ophiolite is considered to originate in a island arc. The occurrence of the ophiolite indicates that a paleo-ocean or finite oceanic basin existed POSt-Prot6rozoic in southern Qiuling, implying the difference of the continental basement of Southern Qinling from the Yangtze craton. The ophiolitc and themelange may mark the paleo-suture zoic between the two plates. The basic granulite is found in eastern area (Anzishan) of the ophiolite belt. The p-T path for metamorphism of the granulite demonstrates a process of continental collision.

关键词： ophiolite granulite paleo-ocean p-T path Southern Qinling.