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Deposition features of Ni on self-assembled microtubule template from biolipid by electroless method

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Science china Chemistry 2004年第3期47卷 228-234页

作者： FU Yubin1,2. ZHANG Lide1, ZHENG Jiyong2. FU Shangang3 & ZHU Mingwei3 1. Institute of Solid State physics, Chinese Academy of Sciences, Hefei 2.0031, china 2. Luoyang Ship Material Research Institute, Luoyang 471039, china 3. college of Life Science, Henan normal University, Xinxiang 453002. china 1. Institute of Solid State physics Chinese Academy of Sciences 230031 Hefei China 2. Luoyang Ship Material Research Institute 471039 Luoyang China 3. college of Life Science Henan Normal University 453002 Xinxiang China

Diacetylenic glycero-phosphatidylcholine is a chiral molecule with amphiphilic property, and it can self-assembly into a lipid microtubular structure. The lipid microtubule is a stable structure formed by tightly wound helical ribbons, and the ribbon-wrapping patterns have a significant effect on their chemical deposition on the microtubules. The deposition of colloidal Pd catalyst occurs mainly on the helical edge of the wound helical ribbons to form helical deposition lines of colloidal Pd particles in the interior and exterior of the lipid microtubules, resulting in an uneven chemical deposition of Ni on the microtubules. Catalyzed by as-deposited colloidal Pd, metallized Ni microtubules are characterized by a helical form, which may be in relation to inner stress due to the thickness difference or the different deposition processes. The observation of microtom shows that metallized tubules have a hollow structure. Some metallized tubules have a kind of coaxial double layer structure observed in the direct experiment evidence, indicating that metallization can occur in the inner and outer surface of the lipid tubules. Both lipid microtubules and metallized microtubules can be used as vehicles for encapsulating biological active molecules to control their release and to develop micro-components in biological and mechanical systems. Keywords molecular self-assembly - lipid microtubules - helical pattern - site-specific deposition - electroless metallization

关键词： molecular self-assembly, lipid microtubules, helical pattern, site-specific deposition, electroless metallization.

Role of gallium wetting layer in high-quality ZnO growth on sapphire (0001) substrates

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Science china(physics,Mechanics & Astronomy) 2004年第5期47卷 612-620页

作者： ZENG Zhaoquan1,3, WANG Yong2. DU Xiaolong1, MEI Zengxia1, KONG Xianghe3, JIA Jinfeng1, XUE Qikun1 & ZHANG Ze2. 4 1. State Key Laboratory for Surface physics, Institute of physics, Chinese Academy of Sciences, Beijing 100080,{2. 2. Laboratory of Electron Microscopy, Institute of physics, Chinese Academy of Sciences, Beijing 100080,{2. 3. college of physics and Engineering, Qufu normal University, Qufu 2.3165,{2. 4. Beijing University of Technology, Beijing 10002.,{2. 1. State Key Laboratory for Surface physics Institute of Physics Chinese Academy of Sciences 100080 Beijing China 2. college of physics and Engineering Qufu Normal University 273165 Qufu China 3. Laboratory of Electron Microscopy Institute of Physics Chinese Academy of Sciences 100080 Beijing China 4. Beijing University of Technology 100022 Beijing China

A Ga wetting layer was used to modify the surface structure of sapphire (0001) substrate to prepare high-quality ZnO film by radio frequency plasma-assisted molecule beam epitaxy. We found that this Ga layer plays a crucial role in eliminating 30 rotation domains, controlling polarity and decreasing defect density in ZnO epilayers, as demonstrated by in situ reflection high energy electron diffraction, ex situ high resolution X-ray diffraction and high resolution cross-sectional transmission electron microscopy. Zn-polar film of ZnO was determined by convergent beam electron diffraction. A Ga bilayer model is proposed to understand the effects of the Ga wetting layer on high-quality ZnO growth.

关键词： Ga wetting layer, sapphire, polarity, defect density, zinc oxide, rf-MBE, RHEED, HRXRD, TEM, CBED.

Modulation on the collective response behavior by the system size in two-dimensional coupled cell systems

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Science china(physics,Mechanics & Astronomy) 2006年第3期49卷 304-312页

作者： ZHANG Jiqian1, SHEN Chuansheng1,2.& CUI Zhifeng1 1. college of physics and Electronic Information, Anhui {2. University, Wuhu 2.1000, china 2. Department of Educational Technology, Anqing Teachers college, Anqing 2.6011, china college of physics Electronic Information Anhui Normal University Wuhu 241000 China Department of Educational Technology Anqing Teachers College Anqing 246011 China

By the intracellular calcium ionic minimal model proposed by Berridge, we investigated the collective response of two-dimensional (N×N) coupled cell systems to the external stimulation using numerical simulation methods. With a coupled intensity fixed and an appropriate coupled cell number chosen, the kinetic system size resonance was discovered. At the same time, it was found that the system size responding to the external stimulation for different coupled intensities transferred too, especially when the coupled intensity increased, the range of the corresponding system size extended. These phe- nomena illustrate that the coupled cell number and the coupled intensity can play con- structive roles in noisy coupled systems, by which the biology system would probably improve its capability to respond to the external stimulation.

关键词： cell coupling,collective response,system size resonance

一种自学习的新型单幅图像超分辨率高质量重建算法

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微电子学与计算机 2024年第5期41卷 1-10页

作者：欧阳甜江先阳武汉大学物理科学与技术学院湖北武汉430072 武汉大学物理国家级实验教学示范中心湖北武汉430072

经典的基于稀疏表示和字典学习的超分辨率算法在图像重建质量和计算复杂度上都具备较好的表现。然而,基于外部样本训练得到的字典和待重建图像缺少相关性,会伴随算法鲁棒性较差的问题。为克服这一缺点,提出了一种基于自学习的新型单幅... 详细信息

经典的基于稀疏表示和字典学习的超分辨率算法在图像重建质量和计算复杂度上都具备较好的表现。然而,基于外部样本训练得到的字典和待重建图像缺少相关性,会伴随算法鲁棒性较差的问题。为克服这一缺点,提出了一种基于自学习的新型单幅图像超分辨率高质量重建算法。该算法无需引入外部训练图像,即完全通过待重建图像自身构建的样本进行字典学习和图像重建;这一机制增强了训练字典与待重建图像的相关性。具体而言,在字典训练阶段,针对输入的待重建图像,基于二维经验模态分解进行高频修复预处理,以增强样本源的高频特征;随后构建训练样本集,使用K-奇异值分解算法获得自学习主字典和自学习残差字典,构成双字典。在图像重建阶段,将双字典结构与自学习相结合,先通过主字典实现主高频恢复,再进一步通过残差字典恢复图像的残差高频信息。实验结果表明,所提算法在重建图像的主观视觉效果以及专业质量评价指标上,相对于传统插值算法及经典的字典学习算法具有显著优势。

关键词：超分辨率重建稀疏表示字典学习自学习

Density functional theory study on the structural and electronic properties of Ag-adsorbed (MgO)_n clusters

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Science china(physics,Mechanics & Astronomy) 2009年第5期52卷 734-741页

作者： GE GuiXian1, JING Qun1 & LUO YouHua2.3 1 Key Laboratory of Ecophysics and Department of physics, {2. college, Shihezi University, Shihezi 832.03, china 2.School of Science, East china University of Science and Technology, Shanghai 2.02.7, china 3 Institute for Theoretical physics, Henan University, Kaifeng 475004, china Key Laboratory of Ecophysics and Department of physics Normal College Shihezi University Shihezi 832003 China School of Science East China University of Science and Technology Shanghai 200237 China Institute for Theoretical physics Henan University Kaifeng 475004 China

Equilibrium geometries, charge distributions, stabilities and electronic properties of the Ag-adsorbed (MgO)n (n = 1-8) clusters have been investigated by density functional theory (DFT) with generalized gradient approximation (GGA) for exchange-correlation functional. The results show that hollow site is energetically preferred for n≥4, and the incoming Ag atoms tend to cluster on the existing Ag cluster. The Mulliken populations indicate that the interaction between the Ag atom and Magnesia clusters is mainly induced by a weak atomic polarization. The adsorbed Ag atom only causes charge redistributions of the atoms near itself. The effect of the adsorbed Ag atom on the bonding natures and structural features of Magnesia clusters is minor. Furthermore, the investigations on the first energy difference, fragmentation energies and electron affinities show that the Ag(MgO)4 and Ag(MgO)6 are the most stable among studied clusters.

关键词： Ag (MgO)_n clusters geometries electronic properties

A computational investigation of boron-doped chromium and chromium clusters by density functional theory

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Science china(physics,Mechanics & Astronomy) 2010年第5期53卷 812-817页

作者： GE GuiXian1,JING Qun1 & LUO YouHua2.3 1 Key Laboratory of Ecophysics and Department of physics,{2. college,Shihezi University,Xinjiang 832.03,china 2.School of Science,East china University of Science and Technology,Shanghai 2.02.7,china 3 Institute of Theoretical physics,School of physics and Information Optoelectronics,Henan University,Kaifeng 475004,china 1. Key Laboratory of Ecophysics and Department of physics Normal College Shihezi University Xinjiang 832003 China2. School of Science East China University of Science and Technology Shanghai 200237 China3. Institute of Theoretical Physics School of Physics and Information Optoelectronics Henan University Kaifeng 475004 China

The geometries,stabilities and electronic properties of Crn and CrnB(n=2.9) clusters have been systematically investigated by density functional *** results suggest that the lowest energy structures for CrnB clusters can be obtained by substituting one Cr atom in Crn+1 clusters with B *** geometries of CrnB clusters are similar to that of Crn+1 clusters except for local structural *** second-order difference and fragmentation energy show Cr4,Cr6,Cr8,Cr3B,Cr5B and Cr8B cluster are the most stable among these studied *** impurity B increases the stabilities of chromium *** B is doped on the Crn clusters,cluster geometry does dominate positive role in enhancing their *** doped B atom does not change the coupling way of the Cr site in Crn clusters,but breaks the symmetry and the Cr atoms are no longer *** doped B atom increases the total magnetic moments of Crn in most cases.

关键词： Crn and CrnB clusters geometries electronic properties

Optimal controlled teleportation via several kinds of three-qubit states

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Science china(physics,Mechanics & Astronomy) 2008年第10期51卷 1529-1556页

作者： GAO Ting1,2. YAN FengLi2.3 & LI YouCheng3 1 college of Mathematics and Information Science, Hebei normal University, Shijiazhuang 050016,{2. 2.Max-Planck-Institut für Quantenoptik, Hans-Kopfermann-Str. 1, D-85748 Garching, Germany 3 college of physics and Information Engineering, Hebei normal University, Shijiazhuang 050016,{2. college of Mathematics and Information Science Hebei Normal University Shijiazhuang 050016 China Max-Planck-Institut für Quantenoptik Hans-Kopfermann-Str. 1 D-85748 Garching Germany college of physics and Information Engineering Hebei Normal University Shijiazhuang 050016 China

The probability of successful controlled teleportation of an unknown qubit using a general three-particle state is investigated. The analytic expressions of maximal probabilities via several kinds of tripartite states... 详细信息

关键词： controlled teleportation three-qubit state maximal probability

Entropy product measure for multipartite pure states

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Science china(physics,Mechanics & Astronomy) 2006年第5期49卷 606-615页

作者： CAO Wancang1,2. LIU Dan2. PAN Feng3 & LONG Guilu2.4 1. Department of physics, Chifeng college, Chifeng 02.001,{2. 2. Key Laboratory for Quantum Information and Measurements, Department of physics, Tsinghua University, Beijing 100084,{2. 3. Department of physics, Liaoning normal University, Dalian 11602.,{2. 4. Key Laboratory for Atomic and Molecular Nano-Sciences, Tsinghua University, Beijing 100084,{2. Correspondence should be addressed to Long Guilu Department of physics Chifeng College Chifeng 024001 China Key Laboratory for Quantum Information Measurements Department of Physics Tsinghua University Beijing 100084 China Department of physics Liaoning Normal University Dalian 116029 China Key Laboratory for Atomic Molecular Nano-Sciences Tsinghua University Beijing 100084 China

An entanglement measure for multipartite pure states is formulated using the product of the von Neumann entropy of the reduced density matrices of the constituents. Based on this new measure, all possible ways of the maximal entanglement of the triqubit pure states are studied in detail and all types of the maximal entanglement have been compared with the result of ‘the average entropy’. The new measure can be used to calculate the degree of entanglement, and an improvement is given in the area near the zero entropy.

关键词： multipartite pure state von Neumann entropy entanglement measure

Quantum secret sharing between multiparty and multiparty with four states

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Science china(physics,Mechanics & Astronomy) 2007年第5期50卷 572-580页

作者： YAN FengLi1, GAO Ting2.& LI YouCheng1 1 college of physics and Information Engineering, Hebei {2. University, Shijiazhuang 050016, china 2.college of Mathematics and Information Science, Hebei {2. University, Shijiazhuang 050016, china 1. college of physics and Information Engineering Hebei Normal University Shijiazhuang 050016 China 2. college of Mathematics and Information Science Hebei Normal University Shijiazhuang 050016 China

A protocol of quantum secret sharing between multiparty and multiparty with four states was presented. It was shown that this protocol can nullify the Trojan horse attack with a multi-photon signal, the fake-signal attack with Einstein-Podolsky- Rosen pairs, the attack with single photons, and the attack with invisible photons. In addition, the upper bounds of the average success probabilities were given for dishonest agent eavesdropping encryption using the fake-signal attack with any two-particle entangled states.

关键词： quantum secret sharing, security, Einstein-Podolsky-Rosen pairs