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A new approach of cascade utilization of the chemical energy of fuel

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Progress in Natural Science:Materials International 2006年第5期16卷 518-523页

作者： HAN Wei, JIN Hongguang and LIN Rumou ( Institute of Engineering Thermophysics, chinese academy of sciences, beijing 100080, china graduate school of the chinese academy of sciences, beijing 100080, china) Institute of Engineering Thermophysics Chinese Academy of Sciences Beijing 100080 China graduate school of the chinese academy of sciences Beijing 100080 China

The indirect release of chemical energy of fuel is investigated, and a new mechanism is proposed to identify the cascade utilization of chemical energy of fuel more clearly. Based on the concept of energy level, the internal phenomenon of the indirect chemical energy release is disclosed, and the equations of energy level describing the utilization of chemical energy and thermal energy during the indirect chemical energy release process are obtained. From theoretical analysis, we find that the superiority of the indirect chemical energy release of fuel comes from the cascade utilization of the fuel's chemical energy. Moreover, the cascade utilization of chemical energy is verified by the investigation of CRGT (chemically recuperated gas turbine). As a result, the thermal exergy obtained from the chemical energy release of fuel increases by 2 % -3 % . The results obtained here may help a deeper understanding of indirect chemical energy release of fuel and provide a theoretical basis for the synthesis of innovative energy systems.

关键词： chemically recuperated gas turbine methane/steam reforming chemical energy level cascade utilization.

One-dimensional unsteady general solution for Wang bioheat transfer equation with heat source proportional to temperature

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Progress in Natural Science:Materials International 2006年第7期16卷 766-768页

作者： GOU Chenhua and CAI Ruixian ( Institute of Engineering Thermophysics, chinese academy of sciences, beijing 100080, china graduate school, chinese academy of sciences, beijing 100080, china) chinese Acad Sci Inst Engn Thermophys Beijing 100080 Peoples R China chinese Acad Sci Grad Sch Beijing 100080 Peoples R China

An analytical general solution is derived for the non-Fourier Wang bioheat transfer model with special internal heat production. It is valuable for finding the special solutions with specified conditions and for expanding the understanding of the non-Fourier heat conduction phenomena in living tissues, for example, the controversial temperature fluctuation effects. This analytical solution can also be used as the benchmark solution to check the numerical calculations and to develop various numerical computational approaches. Because there is an arbitrary function in the expression of internal heat production, this solution can actually be applied to many types of internal heat production distributions.

关键词： bioheat transfer model non-fourier effect analytical solution

Recent progress in fingerprint recognition

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Progress in Natural Science:Materials International 2006年第3期16卷 231-240页

作者： TIAN Jie, CHEN Xinjian, ZHANG Yangyang, YANG Xin, HE Yuliang, LI Liang, XIE Weihua and ZHENG Zhipeng (Center for Biometrics and Security Research, Key Laboratory of Complex Systems and Intelligence Science, Institute of Automation, chinese academy of sciences, beijing 100080, china graduate school of the chinese academy of sciences, beijing 100080, china) Center for Biometrics and Security Research Key Laboratory of Complex Systems and Intelligence Science Institute of Automation Chinese Academy of Sciences Beijing 100080 China graduate school of the chinese academy of sciences Beijing 100080 China

Fingerprint recognition has been increasingly used to realize personal identification in civilian' s daily life, such as ID card, fingerprints hard disk and so on. Great improvement has been achieved in the on-line fingerprint sensing technology and automatic fingerprint recognition algorithms. Various fingerprint recognition techniques, including fingerprint acquisition, classification, enhancement and matching, are highly improved. This paper overviews recent advances in fingerprint recognition and summarizes the algorithm proposed for every step with special focuses on the enhancement of low-quality fingerprints and the matching of the distorted fingerprint images. Both issues are believed to be significant and challenging tasks. In addition, we also discuss the common evaluation for the fingerprint recognition algorithm of the Fingerprint Verification Competition 2004 (FVC2004) and the Fingerprint Vendor Technology Evaluation 2003 (FpVTE2003), based on which we could measure the performance of the recognition algorithm objectively and uniformly.

关键词： biometrics fingerprint enhancement matching minutia image registration similarity measures.

Algebraically explicit analytical solu-tions for the unsteady non-Newtonian swirling flow in an annular pipe

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Science china(Physics,Mechanics & Astronomy) 2006年第4期49卷 396-400页

作者： CAI Ruixian1 & GOU Chenhua1,2 1. Institute of Engineering Thermophysics, chinese academy of sciences, beijing 100080, china 2. graduate school, chinese academy of sciences, beijing 100080, china Institute of Engineering Thermophysics Chinese Academy of Sciences Beijing China graduate school Chinese Academy of Sciences Beijing China

This paper presents two algebraically explicit analytical solutions for the incompressible unsteady rotational flow of Oldroyd-B type in an annular pipe. The first solution is derived with the common method of separation of variables. The second one is deduced with the method of separation of variables with addition developed in recent years. The first analytical solution is of clear physical meaning and both of them are fairly simple and valuable for the newly developing computational fluid dynamics. They can be used as the benchmark solutions to verify the applicability of the existing numerical computational methods and to inspire new differencing schemes, grid generation ways, etc. Moreover, a steady solution for the generalized second grade rheologic fluid flow is also presented. The correctness of these solutions can be easily proven by substituting them into the original governing equation.

关键词： analytical solution, Oldroyd-B type fluid, swirling flow, non-Newtonian.

Mechanism and Defense on Malicious Code

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Wuhan University Journal of Natural sciences 2005年第1期10卷 83-88页

作者： WEN Wei-ping 1,2,3, QING Si-han 1,2,31. Institute of Software, the chinese academy of sciences, beijing 100080, china 2.Engineering Research Center for Information Security Technology, the chinese academy of sciences, beijing 100080, china 3.graduate school of the chinese academy of sciences, beijing 100080, china Institute of Software the Chinese Academy of Sciences Beijing China Engineering Research Center for Information Security Technology the Chinese Academy of Sciences Beijing China graduate school of the chinese academy of sciences Beijing China

With the explosive growth of network applications, the threat of the malicious code against network security becomes increasingly serious. In this paper we explore the mechanism of the malicious code by giving an attack model of the malicious code, and discuss the critical techniques of implementation and prevention against the malicious code. The remaining problems and emerging trends in this area are also addressed in the paper.

关键词： malicious code attacking model mechanism defense system security network security

Explicit analytical solutions of the anisotropic Brinkman model for the natural convection in porous media(Ⅱ)

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Science china(Physics,Mechanics & Astronomy) 2005年第4期48卷 422-430页

作者： CAI Ruixian1, GOU Chenhua1, 2 & ZHANG Na1 1. Institute of Engineering Thermophysics, chinese academy of sciences, beijing 100080, china 2. graduate school, chinese academy of sciences, beijing 100080, china Institute of Engineering Thermophysics Chinese Academy of Sciences Beijing China graduate school Chinese Academy of Sciences Beijing China

Some algebraically explicit analytical solutions are derived for the anisotropic Brinkman model―an improved Darcy model―describing the natural convection in porous media. Besides their important theoretical meaning (for example, in analyzing the non-Darcy and anisotropic effects on the convection), such analytical solutions can be the benchmark solutions that can promote the development of computational heat and mass transfer. Some solutions considering the anisotropic effect of permeability have been given previously by the authors, and this paper gives solutions including the anisotropic effect of thermal conductivity and the effect of heat sources.

关键词： explicit analytical solution, porous medium, natural convection, Brinkman model, anisotropic.

Induction of nicotine in tobacco by herbivory and its relation to glucose oxidase activity in the labial gland of three noctuid caterpillars

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chinese Science Bulletin 2004年第15期49卷 1596-1601页

作者： ZONG Na1,2 & WANG Chenzhu1 1.State Key Laboratory of Integrated Management of Insects & Rodents,Institute of Zoology,chinese academy of sciences,beijing 100080,china 2.graduate school of chinese academy of sciences,beijing 100080,china Correspondence should be addressed to Wang Chenzhu(e-mail: czwang@***) State Key Laboratory of Integrated Management of Insects and Rodents Institute of Zoology Chinese Academy of Sciences Beijing 100080 China graduate school of chinese academy of sciences Beijing 100080 China

Tobacco Nicotiana tabacum L. is a host plant of Helicoverpa armigera (Hübner), Helicoverpa assulta Guenée and Spodoptera litura (Fabricius) (Lepidoptera, Noctuidae). The difference in leaf nicotine response to the feeding by these three larvae and the mechanical simulation of their feeding was examined by HPLC. Results indicated that nico- tine induction was suppressed by H. armigera and H. assulta larvae feeding or by simulated damage treated with their labial glands extracts. The production of nicotine was also suppressed by the glucose oxidase from Aspergillus niger when it was treated on mechanically wounded leaf area. On the contrary, the nicotine production was stimulated by S. litura larva feeding or by simulated damage treated with its labial gland extract. Heat denature can not counteract the stimulation effect of the S. litura labial gland extracts to to- bacco nicotine production. The glucose oxidase activity was detected in labial gland extracts of both H. armigera and H. assulta, but the activity in H. armigera was significantly higher than that in H. assulta. No glucose oxidase activity was detected in labial gland extracts of S. litura. It is shown that the glucose oxidase activity in labial glands of caterpil- lars plays an important role in the nicotine response to her- bivory. The glucose oxidase was mainly contained in the la- bial gland of H. armigera larva, and had the highest activity at pH 7.0. D-Glucose was the optimal substrate of the glucose oxidase. Labial gland glucose oxidase activities varied daily during larval development with high activities found when larvae were actively feeding.

关键词：烟碱烟草葡萄糖氧化酶三夜蛾毛虫棉铃虫烟毒虫斜纹夜蛾

Nerve Growth Factor Prevents the Apoptosis-associated Increase in Acetylcholinesterase Activity after Hydrogen Peroxide Treatment by Activating Akt

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Acta Biochimica et Biophysica Sinica 2007年第1期39卷 46-56页

作者： Hua JIANG~(1,3) Jingya ZHANG~(1,3) Hui ZHU~(1,3) Hong LI~2 and Xuejun ZHANG~1 ~1Laboratory of Molecular Cell Biology,Institute of Biochemistry and Cell Biology,Shangha Institutes for Biological sciences,chinese academy of sciences,Shanghai 200031,china ~2DEFEMA,Faculté de Medecine et de Pharmacie,University of Rouen,Rouen 76821,France ~3graduate school of the chinese academy of sciences,beijing 100080,china Laboratory of Molecular Cell Biology Institute of Biochemistry and Cell Biology Shanghai Institutes for Biological Sciences Chinese Academy of SciencesShanghai 200031 China graduate school of the chinese academy of sciences Beijing 100080 China DEFEMA Faculté de Medecine et de Pharmacie University of RouenRouen 76821 France

Acetylcholinesterase （ACHE） is thought to play an important role during *** resultsshowed that H2O2induced AChE activity,a functional marker in apoptosis,increases in neuronal-like PC ***, which is involved in cellular redox homeostasis,inhibited the increase of AChE activity,suggesting that reactive oxygen species （ROS） play a key role in this *** investigation showedthat the elevation of AChE was observed after the degradation of Akt, release of cytochrome c from mitochondriainto the cytosol,and activation of caspase family *** nerve growth factor （NGF） was present,with the maintenance of Akt level,the elevation of AChE,the cytochrome c diffusion,as well as apoptosiswere markedly attenuated in H202-treated PC 12 cells. However,wortmannin,an inhibitor of the PI3K/Aktpathway,accelerated the apoptosis and increased the AChE *** overexpression of constitutivelyactivated Akt,which is a downstream signalling element of the NGF receptor TrkA,delayed mitochondrialcollapse and inhibited elevation of AChE ***, NGF prevented apoptosis and elevation of AChEactivity by activating the Akt pathway and stabilizing the function of mitochondria.

关键词： acetylcholinesterase(AChE) reactive oxygen species(ROS) Akt apoptosis

Research on Nanometer Technique and Low-Work-Loss Sensor

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稀有金属材料与工程 2006年第S3期 110-112页

作者： Lan Wang~1 Yayan Liu~1 Yifei Yang~(1,2) Jingwen He~1 (1.Changchun Institute of Applied Chemistry,chinese academy of sciences,Changchun 130022,china) (2.graduate school of chinese academy of sciences,beijing 100080,china)

The preparation process of the CO gas sensor used at normal temperature is *** electric conductance of this type of sensor evolved oscillation from regularly when the sensor is exposed to low level CO *** gas sensing mechanism was investigated by its crystalline *** mechanism of information sensing,which was the concurrence of the grain boundary barrier control and the crystal surface control,is discussed.

关键词： nanometer technique low-work-loss sensor