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Quantum BCH Codes Based on Spectral Techniques

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Communications in Theoretical Physics 2006年第2期45卷 283-286页

作者： guo Ying ZENG Gui-Hua Department of Electronic Engineering Shanghai Jiao Tong University Shanghai 200030 China

When the time variable in quantum signal processing is discrete, the Fourier transform exists on the vector space of n-tuples over the Galois field F2, which plays an important role in the investigation of quantum signals. By using Fourier transforms, the idea of quantum coding theory can be described in a setting that is much different from that seen that far. Quantum BCH codes can be defined as codes whose quantum states have certain specified consecutive spectral components equal to zero and the error-correcting ability is also described by the number of the consecutive zeros. Moreover, the decoding of quantum codes can be described spectrally with more efficiency.

关键词： Fourier transform BCH code quantum error-correction code

Thermal Entanglement of a Three-Qubit Heisenberg Chain with a Nonuniform Magnetic Field

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Communications in Theoretical Physics 2008年第6期49卷 1635-1638页

作者： YANG guo-Hui ZHOU Ling School of Physics and Optoelectronic Technology Dalian University of Technology Dalian 116023 China

The thermal entanglement of a three-qubit Heisenberg chain under a nonuniform magnetic field is studied. It is very interesting to note that the next nearest neighbor entanglement （NNNE） could be larger than the nearest neighbor entanglement （NNE）. We analyze the ground state entanglement, and give the conditions that NNNE is larger than NNE near zero temperature. Our results also show that the nonuniform field could induce the entanglement and improve the threshold temperature at certain parameter region.

关键词： Heisenberg model entanglement nonuniform magnetic field

Weyl-Ordered Operator Product Formula Derived by Technique of Integration Within Weyl-Ordered Product of Operators

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Communications in Theoretical Physics 2007年第5X期48卷 823-826页

作者： FAN Hong-Yi guo Qin Department of Physics Shanghai Jiao Tong University Shanghai 200030 China Department of.Material Science and Engineering University of Science and Technology of China Hefei 230026 China

Based on the explicit Weyl-ordered form of Wigner operator and the technique of integration within Weylordered product of operators we derive the Weyl-ordered operator product formula. The formula is then generalized ... 详细信息

关键词： Weyl-ordering IWOP technique entangled state Weyl product

Influence of gangue existing states in iron ores on the formation and flow of liquid phase during sintering

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International Journal of Minerals,Metallurgy and Materials 2014年第10期21卷 962-968页

作者： guo-liang Zhang Sheng-li Wu Shao-guo Chen Bo Su Zhi-gang Que Chao-gang Hou School of Metallurgical and Ecological Engineering University of Science and Technology Beijing

Gangue existing states largely affect the high-temperature characteristics of iron ores. Using a micro-sintering method and scan- ning electron microscopy, the effects of gangue content, gangue type, and gangue size on the assimilation characteristics and fluidity of liquid phase of five different iron ores were analyzed in this study. Next, the mechanism based on the reaction between gangues and sintering mate- dais was unraveled. The results show that, as the SiO2 levels increase in the iron ores, the lowest assimilation temperature （LAT） decreases, whereas the index of fluidity of liquid phase （IFL） increases. Below 1.5wt%, Al2O3 benefits the assimilation reaction, but higher concentra- tions proved detrimental. Larger quartz particles increase the SiO2 levels at the local reaction interface between the iron ore and CaO, thereby reducing the LAT. Quartz-gibbsite is more conductive to assimilation than kaolin. Quartz-gibbsite and kaolin gangues encourage the forma- tion of liquid-phase low-Al2O3-SFCA with high IFL and high-Al2O3-SFCA with low IFL, respectively.

关键词： iron ores ore sintering assimilation liquid phase fluidity

The Combined Effect of Spin-Transfer Torque and Voltage-Controlled Strain Gradient on Magnetic Domain-Wall Dynamics:Toward Tunable Spintronic Neuron

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Chinese Physics Letters 2024年第5期41卷 120-137页

作者：郁国良何鑫岩施胜宾邱阳朱明敏王嘉维李燕李元勋王杰周浩淼 College of Information Engineering China Jiliang UniversityHangzhou 310018China The Key Laboratory of Electromagnetic Wave Information Technology and Metrology of Zhejiang Province Hangzhou 310018China Department of Engineering Mechanics Zhejiang UniversityHangzhou 310027China School of Electronic Science and Engineering University of Electronic Science and Technology of ChinaChengdu 611731China

Magnetic domain wall(DW), as one of the promising information carriers in spintronic devices, have been widely investigated owing to its nonlinear dynamics and tunable properties. Here, we theoretically and numerically demonstrate the DW dynamics driven by the synergistic interaction between current-induced spin-transfer torque(STT) and voltage-controlled strain gradient(VCSG) in multiferroic heterostructures. Through electromechanical and micromagnetic simulations, we show that a desirable strain gradient can be created and it further modulates the equilibrium position and velocity of the current-driven DW motion. Meanwhile, an analytical Thiele's model is developed to describe the steady motion of DW and the analytical results are quite consistent with the simulation data. Finally, we find that this combination effect can be leveraged to design DW-based biological neurons where the synergistic interaction between STT and VCSG-driven DW motion as integrating and leaking motivates mimicking leaky-integrate-and-fire(LIF) and self-reset function. Importantly, the firing response of the LIF neuron can be efficiently modulated, facilitating the exploration of tunable activation function generators, which can further help improve the computational capability of the neuromorphic system.

关键词： tunable synergistic integrating

Deconfinement Phase Transition Including Perturbative QCD Corrections in (Proto)neutron Star Matter

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Communications in Theoretical Physics 2008年第2期49卷 461-466页

作者： GU Jian-Fa guo Hua LEE Xi-guo LIU Yu-Xin XU Fu-Rong Department of Technical Physics and MOE Laboratory of Heavy Ion Physics Peking University Beijing 100871 China Center of Theoretical Nuclear Physics National Laboratory of Heavy Ion Accelerator Lanzhou 730000 China Institute of Modern Physics The Chinese Academy of Sciences Lanzhou 730000 China Department of Physics Peking University Beijing 100871 China

Deconlinement phase transition and neutrino trapping in （proto）neutron star matter are investigated in a chiral hadronic model （also referred to as the FST model） for the hadronic phase （HP） and in the color-flavor-locked （CFL） quark model for the deconlined quark phase. We include a perturbative QCD correction parameter αs in the CFL quark matter equation of states. It is shown that the CFL quark core with K^0 condensation forms in neutron star matter with the large value of αs. If the small value of αs is taken, hyperons suppress the CFL quark phase and the liP is dominant in the high-density region of （proto）neutron star matter. Neutrino trapping makes the fraction of the CFL quark matter decrease compared with those without neutrino trapping. Moreover, increasing the QCD correction parameter as or decreasing the bag constant B and the strange quark mass ms can make the fraction of the CFL quark matter increase, simultaneously, the fraction of neutrino in protoneutron star matter increases, too. The maximum masses and the corresponding radii of （proto）neutron stars are not sensitive to the QCD correction parameter αs.

关键词： deconfinement phase transition neutrino trapping neutron star matter

Rheological and DSC Studies on the Interaction between κ-Carrageenan and Cellulose Nanocrystals (CNC)

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Chinese Chemical Letters 2006年第5期17卷 695-698页

作者： Rui guo En Yong DING Key Laboratory of Cellulose and Lignocellulosics Chemistry Guangzhou Institute of Chemistry Chinese Academy of Sciences Guangzhou 510650 Graduate School of the Chinese Academy of Sciences Beijing 100039

Rheometer and differential scanning calorimetry （DSC） have been used to probe the mechanism of gelation in gels formed by mixture of k-carrageenan and cellulose nanocrystals （CNC）. The results indicated that an as... 详细信息

关键词： Rheology DSC r-carrageenan cellulose nanocrystals (CNC).

KKT-based iterative algorithm for beamforming in cognitive radio system

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The Journal of China Universities of Posts and Telecommunications 2011年第5期18卷 42-46页

作者： ZHANG Cai-hong guo Li Key Laboratory of Universal Wireless Communications Ministry of Education Beijing University of Posts and Telecommunications Beijing 100876 China

In this paper, we consider the downlink channel of multi-user multi-input single-output （MU-MISO） system in cognitive radio network, where the cognitive base station （CBS） resort to beamforming scheme to relief co-channel interference. The design criterion is to minimize the transmit power at CBS, subject to the signal-to-interference-plus-noise-ratio （SINR） constraints of cognitive users （CUs） and the interference constraints at primary users （PUs）. Standard conic optimization packages can handle the problem, however, the complexity is very high and optimization packages are not always available. Basing on the karush-kuhn-tucker （KKT） conditions of the converted optimization problem, we proposed an iteration algorithm. Simulation results reveal that the proposed algorithm can converge to the optimal beamforming vectors that lead to minimum transmit power with all constraints satisfied.

关键词： cognitive radio bearnforming SOCP KKT

Texture Evolution in Ferritic Rolled Ti-IF Steel During Cold Rolling

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Journal of Iron and Steel Research International 2010年第1期17卷 44-48,58页

作者： ZHANG Peng guo Yan-hui WANG Zhao-dong WANG guo-dong LIU Xiang-hua State Key Laboratory of Rolling and Automation Northeastern University Shenyang 110004 Liaoning China Benxi Iron and Steel (Group) Co Ltd Benxi 117000 Liaoning China

The texture evolution of ferritic hot rolled Ti-IF steel during cold rolling was investigated in which the reduction was from 15% to 85 %. It was found that α fibre texture was monotonously intensified with the increase in the cold rolling reduction, while y fibre texture changed in a different way. When the cold rolling reduction was in the range of 15 % -- 35 % or 45 % -- 75 %, γ fibre texture was strengthened ; however, when the cold rolling reduction was 35 %- 45 % or 75 %- 85%, the intensity of 7 fibre was reduced. The 7 fibre displayed a maximum intensity for the reduction of 75%, and the highest average plastic strain ratio was simultaneously obtained owing to the favorable recrystallization texture.

关键词： Ti-IF steel ferritic hot rolling cold rolling texture average plastic strain ratio