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Influence of blasting on the properties of weak intercalation of a layered rock slope

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International Journal of Minerals,Metallurgy and Materials 2009年第1期16卷 7-11页

作者： xiao-lin Song Ji-chun Zhang xue-bin Guo Zheng-xue xiao School of Civil Engineering Southwest Jiaotong University Chengdu 610031 China Traction Power State Key Laboratory Southwest Jiaotong University Chengdu 610031 China School of Environmental Engineering Southwest University of Science and Technology Mianyang 621002 China

A precondition for correctly analyzing the stability of a slope and designing its bracing structure is to study and determine the influence of excavation blasting on the properties of weak intercalation in the layered rock slope. On the basis of in-situ stratification-cracking blasting tests, the properties of weak intercalation were investigated using the LS-DYNA3D program. The displacement distribution and compactness of weak intercalation at different positions away from the charge center and their various laws are discussed. The critical displacement of stratification-cracking （0.1 mm） was obtained, and an approximate expression of compactness were deduced. Furthermore, through the simulation of a layered rock blasting under the same geological conditions, the stratification-cracking effect of deep-hole blasting on the properties of weak intercalation was compared with that of short-hole blasting, and the influencing differences, in addition to their causes, were analyzed. The results indicated that the blasting cavity of weak intercalation in short-hole blasting with a radius of 40 mm was nearly a circle, whose radius was about 28.7 cm; whereas in deep-hole blasting with a radius of 150 mm, the shape of the blasting cavity was different from that in short-hole blasting, the radius of the cavity behind the charge （89.1 cm） was further smaller than those of the other three （138.7 cm）, and there were sharp crinkles on the surface of weak intercalation. When the distance from the charge center （DCC） was less than 40 and 150 cm in short-hole and deep-hole blasting, respectively, the displacement of weak intercalation was reduced remarkably with the increase in DCC.

关键词： rock slope bench blasting numerical simulation intercalation

A novel QO-STBC scheme with linear decoding

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The Journal of China Universities of Posts and Telecommunications 2011年第5期18卷 53-57页

作者： xiao Li-ping DAI xiao-xue College of Information Science and Engineering Yanshan University Qinhuangdao 066004 China

A new quasi-orthogonal space-time block code （QO-STBC） scheme, based on eigen value decomposition （EVD）, is explored in this paper. The new scheme can significantly reduce the QO-STBC decoding complexity at receiver and achieves better bit-error rate （BER） performance as well. With EVD manipulations, the detection matrix and the channel matrix can be redefined to remove all interference terms which come from other antennas, and therefore the conventional maximum likelihood （ML） decoding method with less complexity can be applied. Moreover the new scheme improves the BER performance significantly. Theoretical analysis and simulation results are presented in this paper to show the validation of this new scheme.

关键词： quasi-orthogonal space time code maximum likelihood linear decoding eigen value decomposition

Ultra-slow Bright and Dark Optical Solitons in Cold Media

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Communications in Theoretical Physics 2006年第2期45卷 335-342页

作者： YANG xiao-xue WU Ying physics Department Huazhong University of Science and Technology Wuhan 430074 China School of Physical Science and Information Technology Liaocheng UniversityLiaocheng 252059 China

We present a systematic study on the formation of ultra-slow bright and dark optical solitons in highly resonant media. By investigating four life-time broadened atomic systems, i.e., three-state A-type and cascade-type schemes, and four-state N-type and cascade-type schemes, we show that the formation of such ultra-slow solitons in cold atomic systems is a fairly universal phenomenon.

关键词： ultra-slow and super-luminal propagation electromagnetically induced transparency solitons

Dynamics of Two-Level Trapped Ion in a Standing Wave Laser in Noncommutative Space

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Communications in Theoretical Physics 2007年第5期47卷 921-926页

作者： YANG xiao-xue WU Ying Department of Physics Huazhong University of Science and Technology Wuhan 430074 China

We study the dynamics of a two-level trapped ion in a standing wave electromagnetic field in two-dimensional （2D） noncommutative spaces in the Lamb-Dicke regime under the rotating wave approximation. We obtain the explicit analytical expressions for the energy spectra, energy eigenstates, unitary time evolution operator, atomic inversion, and phonon number operators. The Rabi oscillations, the collapse, and revivals in the average atomic inversion and the average phonon number are explicitly shown to contain the information of the parameter of the space noncommutativity, which sheds light on proposing new schemes based on the dynamics of trapped ion to test the noncommutativity.

关键词： two-level trapped ion noncommutative space

Theoretical Predition of Two-dimensional SiGeP_(2)by the Global Optimization Method

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Journal of Wuhan University of Technology(Materials Science) 2023年第5期38卷 1010-1016页

作者： xue xiao YU Jiahui ZHOU Dawei PU Chunying School of Information Engineering Nanyang Institute of TechnologyNanyang 473004China School of Mathematics and Physics Nanyang Institute of TechnologyNanyang 473004China School of Physics and Electronic Engineering Nanyang Normal UniversityNanyang473061China

The well-developed particle-swarm optimization method together with density functional theory calculations were employed to search lowest-energy geometric structures of two-dimensional(2D)SiGeP_(2).Two newly found structures(P3m1 and Pmm2)are *** unbiased global search reveals that the two lowest-energy structures are honeycomb lattices with robust dynamical stabilities.A more accurate Heyd-Scuseria-Ernzerhof(HSE06)hybrid functional is used to estimate the band structures of SiGeP_(2),which indicates that both the structures are semiconductors with indirect band-gap energies 1.80 e V for P3m1 and1.93 e V for Pmm^(2),*** the deformation potential theory,the P3m1-SiGeP_(2)is predicted to have high electron mobilities(6.4×10^(4)along zigzag direction and 2.9×10^(3)cm^(2)·V^(-1)·s^(-1)along armchair direction,respectively)and hole electron mobilities(1.0×10^(3)along zigzag direction and 2.5×10^(3)cm^(2)·V^(-1)·s^(-1)along armchair direction,respectively),which can be comparable with that of phosphorene and show anisotropic character *** addition,to estimate the elastic limit of SiGeP_(2),we also calculated the surface tension of SiGeP_(2)as a function of tensile *** results show that the 2D SiGeP_(2)may be good candidaticates for applications in nanoelectronic devices.

关键词： two dimensional SiGeP_(2) the first-principles carrier mobility

Carrier-Envelope Phase-Dependent Atomic Coherence and Its Detection Scheme

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Communications in Theoretical Physics 2008年第4期49卷 1022-1024页

作者： YANG xiao-xue WU Ying Physics Department Huazhong University of Science and Technology Wuhan 430074 China

The carrier-envelope phase （CEP） of few-cycle laser pulses is shown to have profound effects on the bound- state atomic coherence even in the weak-field regime where ionizations hardly take place, and a simple schem... 详细信息

关键词： carrier-envelope phase ultrafast processes atomic coherence

Weak-Coupling Theory for Semiclassical Periodically Driven Two-Level Systems： Beyond Rotating-Wave Approximation

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Communications in Theoretical Physics 2007年第2X期48卷 339-342页

作者： YANG xiao-xue WU Ying Department of Physics Huazhong University of Science and Technology Wuhan 430074 China

We present a weak-coupling theory of semiclassical periodically driven two-level systems. The explicit analytical approximating solution is shown to reproduce highly accurately the exact results well beyond the regime... 详细信息

关键词： periodically driven two-level systems weak-coupling theory beyond rotating-wave approximation

Effective Two-State Model and NOON States for Double-Well Bose-Einstein Condensates in Strong-Interaction Regime

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Communications in Theoretical Physics 2009年第8期52卷 244-246页

作者： YANG xiao-xue WU Ying Department of Physics Huazhong University of Science and Technology Wuhan 430074 China Department of Physics Hubei Normal University Huangshi 435002 China

The model of double-well Bose-Einstein condensates in the strong-interaction regime is shown to reduce adiabatically to an effective two-state model describing the Rabi oscillations between the two atomic Fock states ｜N, 0〉 and [0, N〉, and the NOON states of arbitrary ultracold atoms can therefore be generated periodically from the initial state of either one of the Foek states.

关键词： double-well Bose-Einstein condensates effective two-state model NOON states

Effects of Density-Dependent Quark Mass on Phase Diagram of Color-Flavor-Locked Quark Matter

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Communications in Theoretical Physics 2006年第4期45卷 691-696页

作者： ZHANG xiao-Bing LI xue-Qian Department of Physics Nankai University Tianjin 300071 China

Considering the density dependence of quark mass, we investigate the phase transition between the （unpaired） strange quark matter and the color-flavor-locked matter, which are supposed to be two candidates for the ground state of strongly interacting matter. We lind that if the current mass of strange quark m, is smmall, the strange quark matter remains stable unless the baryon density is very high. If m, is large, the phase transition from the strange quark matter to the color-flavor-locked matter in particular to its gapless phase is found to be different from the results predicted by previous works. A complicated phase diagram of three-flavor quark matter is presented, in which the color-flavor-locked phase region is suppressed for moderate densities.

关键词： strange quark matter color-flavor locked quark matter pairing