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Use of virtual reality in underground roof fall hazard assessment and risk mitigation

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International Journal of Mining Science and Technology 2019年第4期29卷 603-607页

作者： e.Isleyen h.S.Duzgun Department of Mining engineering Colorado School of Mines

Virtual reality(VR)simulations are some of the alternative practice environments for safety *** gain experience under the most realistic conditions without being exposed to any real *** reality also serves as a tool to expedite the decision-making process where quick decisions and actions are necessities for a safe *** example of such a situation in underground mines is the failure risks in a tunnel face after *** support systems must be installed based on the stand-up time to ensure the safe access of personnel and equipment to the working ***,a competent person inspects the area to identify risks and determines the required support ***,training of a competent person requires large amount of time and *** study presents virtual reality simulations developed for improving the assessment of the roof fall hazards and taking necessary measures for mitigating the risk related to roof *** virtual reality simulation involves decision-making tasks for a particular scenario in which participants can experience creating a safe working environment in a timely ***,they are asked to identify the potential hazard in a tunnel after blasting,namely,rock fall,wedge failure or groundwater *** the hazard identification is successful,participants are requested to install rock bolts as a safety measure by selecting the bolt pattern(*** length and spacing).Finally,participants evaluate the roof fall hazard by viewing displacements around the opening,before and after the support *** study illustrates the benefits of VR in safety training as well as enhancing the decision-making process to enhance safety.

关键词： Virtual reality hazard assessment Tunneling

Dynamical equations for Quantum Information and Application in Information Channel

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Chinese Physics Letters 2005年第7期22卷 1618-1621页

作者：毕桥邢修三 h.e.Ruda CenterofAdvancedNanotechnology UniversityofTorontoTorontoCanadaM5S3E4 DepartmentofPhysics BeijingInstituteofTechnologyBeijing100081

We establish several dynamical equations for quantum information density. Itis demonstrated that quantum information density shares the same formalism of the Liouvilleequation, subdynamics kinetic equation and Fokker-Planck equation as the density operator and alsopossesses the superposition property. These allow one to use quantum information density directly tomodel quantum information. The kinetic equations for quantum information density reveal that thedynamical process of quantum information may be related to dissipative, Markovian, or diffusionalinformation flows, together causing irreversibility. Finally, we discuss superposition of quantuminformation density, which allows us to construct a quantum information channel in the coherentstate representation using harmonic oscillator based encoded quantum information, and obtain aformula for quantum dynamical mutual information.

关键词： quanta Fokker-Planck equation QUANTUM INFORMATION harmonic oscillators information channels kinetic equations Liouville equation

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维普期刊数据库

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固体物理学

固体物理学

Oxidation Resistance of the Aluminide Coating Formed on Carbon Steels

作者： h.e.·霍尔(h.e. hall)

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Journal of Materials Science & Technology 1997年第5期13卷 383-388页

作者： Soliman, h.M. Ohamed, K.e. Abd el-Azim, M.e. hammad, F.h. Metallurgy Dept. Atomic Energy Authority Cairo Egypt

Low and medium carbon steels were aluminized by the pack aluminizing technique using halideactivated pure-Al and Fe-Al packs. The effect of mixture composition, aluminizing temperatureand time and C content of the steel substrate on the structure and thickness of the aluminidelayer, and on the oxidation resistance was investigated. The optimum oxidation resistance canbe ach.e.ed with a low carbon steel substrate when the intermetallic phases Fe3Al and FeAlform the surface of the aluminide layer. In this case, the Al concentration at the surface of thealuminide coating is at least ≥15 wt pct. Formation of high Al concentration phases (FeAl3 andFe2Al5) during aluminizing should be avoided as they tend to embrittle the aluminide layer andreduce its oxidation resistance.

关键词： OO Figure Oxidation Resistance of the Aluminide Coating Formed on Carbon Steels

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现代大专物理学

现代大专物理学

Approximate any 1-state solutions of the Dirac equation for modified deformed hylleraas potential by using the Nikiforov—Uvarov method

作者： h.e.·怀特(h.e. White)

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Chinese Physics B 2012年第12期21卷 57-65页

作者： h.hassanabadi e.Maghsoodi S.Zarrinkamar h.Rahimov Physics Department Shahrood University of TechnologyShahroodIran Department of Basic Sciences Garmsar BranchIslamic Azad UniversityGarmsarIran Computer engineering Department Shahrood University of TechnologyShahroodIran

We investigate the spin and pseudospin symmetries of the Dirac equation under modified deformed hylleraas potential via a Pekeris approximation and the Nikiforov-Uvarov technique. A tensor interaction of Coulomb form is considered and its degeneracy-removing role is discussed in detail. The solutions are reported for an arbitrary quantum number in a compact form and useful numerical data are included.

关键词： Dirac equation spin symmetry pseudospin symmetry modified hylleraas potential

Ab initio calculations of the elastic,electronic,optical,and vibrational properties of PdGa compound under pressure

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Chinese Physics B 2012年第9期21卷 422-429页

作者： h. Koc A. Yildirim e. Deligoz Department of Physics Siirt University Department of Physics Aksaray University

The structural, elastic, electronic, optical, and vibrational properties of cubic PdGa compound are investigated using the norm-conserving pseudopotentials within the local density approximation （LDA） in the framework of the density functional theory. The calculated lattice constant has been compared with the experimental value and has been found to be in good agreement with.e.perimental data. The obtained electronic band structures show that PdGa compound has no band gap. The second-order elastic constants have been calculated, and the other related quantities such as the Young＇s modulus, shear modulus, Poisson＇s ratio, anisotropy factor, sound velocities, and Debye temperature have also been estimated. Our calculated results of elastic constants show that this compound is mechanically stable. Furthermore, the real and imaginary parts of the dielectric function and the optical constants such as the electron energy-loss function, the optical dielectric constant and the effective number of electrons per unit cell are calculated and presented in the study. The phonon dispersion curves are also derived using the direct method.

关键词： PdGa vibrational properties optical properties elastic constants

Impurity effects on electrical conductivity of doped bilayer graphene in the presence of a bias voltage

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Chinese Physics B 2016年第7期25卷 316-323页

作者： e Lotfi h Rezania B Arghavaninia M Yarmohammadi Department of Physics Sanandaj Branch Islamic Azad University Department of Physics Razi University Department of Physics Kermanshah Branch Islamic Azad University Young researchers and elite Club Kermanshah Branch Islamic Azad University

We address the electrical conductivity of bilayer graphene as a function of temperature, impurity concentration, and scattering strength in the presence of a finite bias voltage at finite doping, beginning with a description of the tight-binding model using the linear response theory and Green＇s function approach. Our results show a linear behavior at high doping for the case of high bias voltage. The effects of electron doping on the electrical conductivity have been studied via changing the electronic chemical potential. We also discuss and analyze how the bias voltage affects the temperature behavior of the electrical conductivity. Finally, we study the behavior of the electrical conductivity as a function of the impurity concentration and scattering strength for different bias voltages and chemical potentials respectively. The electrical conductivity is found to be monotonically decreasing with impurity scattering strength due to the increased scattering among electrons at higher impurity scattering strength.

关键词： bilayer graphene Green's function electrical conductivity