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ON ABSOLUTE STABILITY OF CONTROL SYSTEM WITH SEVERAL EXECUTIVE ELEMENTS

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Science in china,Ser.A 1988年第4期31卷 395-405页

作者：赵素霞 department of Mathematics liaoning normal university dalian

In this paper, we study the absolute stability of control system with several executive elements by means of Liapunov’s functions of the Lur’e form. We obtain some necessary and sufficient conditions for V<0. From these conditions we obtain a very general algebraic criterion for absolute stability. An effective computational procedure is given, which is applicable to all cases when the existence of absolute stability may be established by this type of Liapunov’s function. Furthermore, the stability region in the parameter space is defined by the obtained conditions, the region of which contains that defined by the Popov frequency criterion.

关键词： absolute algebraic executive criterion Liapunov applicable independence arbitrary assume suppose

Caveolin-1 gene silencing promotes the activation of PI3./AKT dependent on Erα3. and the transformation of MCF10A^(CE)

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Science china(Life Sciences) 2010年第5期53卷 598-605页

作者： FENG Shuang1,WANG Yang1,WANG Xi1,WANG ZhaoYi3.CUI YuYing1,LIU Jing4,ZHAO ChunHui1,JIN Mei1,2 & ZOU Wei1,2 1 College of Life Science,liaoning normal university,{3. 116029,china 2 liaoning Key Laboratory of Biotechnology and Molecular Drug R&D,{3. 116029,china 3.Cancer Center,Creighton university,2500 California Plaza,Omaha,NE 68178,USA 4 First Clinical Hospital of {3. Medical university,{3. 116011,china 1. College of Life Science Liaoning Normal University Dalian 116029 China3. Cancer Center Creighton University 2500 California Plaza Omaha NE 68178 USA4. First Clinical Hospital of Dalian Medical University Dalian 116011 China2. Liaoning Key Laboratory of Biotechnology and Molecular Drug R&D Dalian 116029 China

ERα3.,a variant of estrogen receptor-α,acts as a dominant-negative factor in both estrogen-dependent and estrogen-independent transactivation signaling pathways,and is a key factor in the promotion,progression and prognosis of breast ***-1,a 22-to 24-kD integral membrane protein,may function as a tumor suppressor in inhibiting of many growth-promoting signaling *** was shown that downregulation of Caveolin-1 strengthens the interaction of ERα and *** conclusion,Caveolin-1 gene silencing activated the PI3./AKT signaling pathway in an ERα3.-dependent *** finding may provide a promising therapeutic target of breast cancer.

关键词： Caveolin-1 Estrogen receptor PI3./AKT

Symbolic Computation Study of (2+1)-Dimensional Dispersive Long Wave Equations

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Communications in Theoretical physics 2006年第8期46卷 199-202页

作者： LU Zhuo-Sheng~(1,2,+) and XIE Fu-Ding~(2,3. ~1School of Science, Beijing university of Post and Telecommunications, Beijing 100876, china ~2Key Laboratory of Mathematics Mechanization, Academy of Mathematics and System Sciences, the Chinese Academy of Sciences, Beijing 100080, china ~3.3. of Computer Science, liaoning normal university, dalian 116029, china department of Otolaryngology University Hospital VU P.O. Box 7057 1007 MB Amsterdam The Netherlands School of Science Beijing University of Post and Telecommunications Beijing 100876 China

Seeking exact analytical solutions of nonlinear evolution equations is of fundamental importance in mathematical physics. In this paper, based on a constructive algorithm and symbolic computation, abundant new exact solutions of the (2+1)-dimensional dispersive long wave equations are obtained, among which there are soliton-like solutions, mult-soliton-like solutions and formal periodic solutions, etc. Certain special solutions are considered and some interesting localized structures are revealed.

关键词： dispersive long wave equations symbolic computation exact solution localized structure

Extraction of Surface Roughness from the Central δ-peak of Light Scattering Using a Multi-wavelength Ar~+ Laser

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Chinese Journal of Lasers 2000年第3期9卷 22-27页

作者： LIU Deli QI Dongping CHENG Chuanfu (department of physics, Shandong normal {3., Jinan 250014, china) 山东师范大学山东济南

In this paper, a new light scattering method for measuring t he roughness of random surfaces is proposed. The method is based on the relation between the specularly reflected intensity I s, i.e., the central δ-peak intensity and wave vector component k z. The linear fit of the logarithm graph of the normalized central δ-peak intensity I sr versus k-2 z, whose variation is induced by changing illuminating wavelength, gives the square of the surface roughness w. The roughnesses of 6 silicon backside samples were measured.

关键词： random surface roughness light scattering multi-wavelength

Dense coding scheme using superpositions of Bell-states and its NMR implementation

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Science china(physics,Mechanics & Astronomy) 2005年第1期48卷 57-67页

作者： ZHANG Jingfu, XIE Jingyi, DENG Zhiwei & LU Zhiheng Key Laboratory for Quantum Information and Measurements, department of physics, Tsinghua university, Beijing 100084,{3. Center for Quantum Information, Tsinghua university, Beijing 100084,{3. department of Materials Science and Engineering, Beijing normal university, Beijing 100875,{3. Testing and Analytical Center, Beijing normal university, Beijing 100875,{3. department of physics, Beijing normal university, Beijing 100875,{3. 1. Key Laboratory for Quantum Information and Measurements Department of Physics Tsinghua University 100084 Beijing China 2. Center for Quantum Information Tsinghua University 100084 Beijing China 3. department of Materials Science and Engineering Beijing Normal University 100875 Beijing China 4. Testing and Analytical Center Beijing Normal University 100875 Beijing China 5. department of physics Beijing Normal University 100875 Beijing China

Dense coding using superpositions of Bell-states is proposed. The generalized Grover's algorithm is used to prepare the initial entangled states, and the reverse process of the quantum algorithm is used to determine the entangled state in the decoding measurement. Compared with the previous schemes, the superpositions of two Bell-states are exploited. Our scheme is demonstrated using a nuclear magnetic resonance (NMR)quantum computer. The corresponding manipulations are obtained. Experimental results show a good agreement between theory and experiment. We also generalize the scheme to transmit eight messages by introducing an additional two-state system.

关键词： dense coding, superpositions of Bell-states, generalized Grover's algorithm, nuclear magnetic res-onance, quantum computer.

Free Volume Changes in γ-Irradiated Polyethylene and Polytetraflourethylene

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Journal of Materials Science & Technology 2000年第3期16卷 302-304页

作者： Xianyi ZHOU (Dept. of Modern physics, university of Science and Technology of china, Hefei 23.027, china) Linhua ZHAI (department of physics, Anhui normal university, Wuhu 241000, china) Jiangfeng DU and Rongdian HAN (department of Modern physics, Univers department of Modern physics University of Science and Technology of China Hefei 230027 China department of physics Anhui Normal University Wuhu 241000 China

Positron lifetime spectrum was measured and the change of the free volume was studied for commercial polyethylene (PE) and polytetrafluoroethylene (PTFE) during 7-irradiation processing up to 265 kGy. The free volume size increases but the crystallinity decreases as irradiation dose increases in PE. Both qualities (free volume size and crystallinity) in PTFE display an opposite behavior. The fractional free volume reduces monotonically with increasing irradiation dose in both PE and PTFE. The competition between the crosslinkmg and the splitting decomposition in polymers can be used to understand the free volume changes with irradiation dose.

关键词： PTFE Irradiated Polyethylene and Polytetraflourethylene

Lookback time as a test for f(R) gravity in the Palatini approach

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Research in Astronomy and Astrophysics 2011年第11期11卷 1257-1265页

作者： Zhong-Xu Zhai and Wen-Biao Liu department of physics, Institute of Theoretical physics, Beijing {3. university, Beijing 100875, china department of physics Institute of Theoretical Physics Beijing Normal University Beijing 100875 China

We use the recently released data of lookback time (LT)-redshift relation, the cosmic microwave background shift parameter and the baryon acoustic oscillation measurements to constrain cosmological parameters of f (R) gravity in the Palatini formalism by considering the f (R) form of type (a) f (R) = R β/Rn and (b) f (R) = R + α ln R β. Under the assumption of a Friedmann-Robertson-Walker universe, we achieved the best fitting results of the free parameters (Ωm0, n) for (a) and (Ωm0, α) for (b). We find that current LT data can provide interesting and effective constraints on gravity models. Compared with other data, the LT constraints favor a smaller value of the non-relativistic matter energy density.

关键词： cosmology cosmic microwave background

STEREOSPECIFIC POLYMERIZATION OF STYRENE WITH MODIFIED TiCl4/MgCl2-AlEt3. CATALYST

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Chinese Journal of Catalysis 1998年第6期 8-9页

作者： Sun Qi 1,2 , Fan Yinheng 1,2 , Liu Jing 1, Liao Shijian 1** (1 dalian Institute of Chemical physics, The Chinese Academy of Sciences, dalian 116023.2 {3. of Chemistry, liaoning normal university, dalian 116029)

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关键词： Styrene Polymerization Supported titanium catalyst Stereospecificity

Spectral anomalies and spectral switches of partially coherent and polychromatic light diffracted at an aperture

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Science china(physics,Mechanics & Astronomy) 2004年第1期47卷 24-35页

作者： Lü Baida1, 3.& PAN Liuzhan1, 2 1. Institute of Laser physics and Chemistry, Sichuan university, Chengdu 610064, china 2. {3. of physics, Luoyang normal College, Luoyang 471022, china 3. State Key Laboratory of Laser Technology, Huazhong university of Science and Technology, Wuhan 43.074, china Correspondence should be addressed to L Baida (email: badalu@***) Received July 10, 2003 1. Institute of Laser physics and Chemistry Sichuan University 610064 Chengdu China 2. State Key Laboratory of Laser Technology Huazhong University of Science and Technology 430074 Wuhan China 3. department of physics Luoyang Normal College 471022 Luoyang China

Based on the propagation theory of partially coherent light in the space-frequency domain, the anomalous spectral behavior and spectral switches in the far field of partially coherent and polychromatic light diffracted at an aperture are studied. It is shown that, as compared with spatially fully coherent and polychromatic light whose spectral anomalies are induced only by aperture diffraction, the spectral anomalies and spectral switches of partially coherent and polychromatic light depend on the aperture diffraction, spatial correlationβ and bandwidth of the original spectrum. Detailed numerical calculations are made to illustrate the behavior of spectral switches of partially coherent and polychromatic light, and the results for spatially fully coherent and polychromatic light are treated as a special case ofβ=1 and included in our theory.

关键词： spectral anomaly spectral switch partially coherent and polychromatic light far field aperture diffraction