• Dependence of the cosmic muon flux on atmospheric pressure and temperatureDependence of the cosmic muon flux on atmospheric pressure and temperature

    I. INTRODUCTION In a recent experiment the zenith angle distribution of the cosmic muon flux was measured in Hanoi using the telescope of the VATLY laboratory in the Institute of Nuclear Science and Technology [1]. Such a distribution is a useful input to the air shower simulation [2] used by the SuperKamiokande collaboration [3] for their studi...

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  • Studies of photonuclear reactions and photon activation analysis in the giant dipole resonance region using microtronsStudies of photonuclear reactions and photon activation analysis in the giant dipole resonance region using microtrons

    Abstract. Mictrorons are accelerators of electrons and are simultaneous sources of bremsstrahlung photon flux and fission neutrons. In 1982, a microtron of seventeen trajectories Microtron MT - 17 was put into operation at the National Institute of Physics of Vietnam. Though very modest, microtons are very useful for developing countries such as ...

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  • Nd-Fe-B Melt - Spun powder quality estimation based on stoner - wohlfarth modelNd-Fe-B Melt - Spun powder quality estimation based on stoner - wohlfarth model

    Abstract. The squareness factor γ, defined as the ratio BHc/iHc, plays very importance role. This factor reflects the magnetization process under a reversed magnetic field in magnet. So the factor γ can be used as the critical parameter for estimating the magnet quality. For the powder compaction of 6.48 g/cm3 mass density, if γ is less than 0.48...

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  • Axion in pqww model and axion production in e+e− collisionAxion in pqww model and axion production in e+e− collision

    Abstract. Properties of the axion in PQWW model is considered. In this model, axion appears as a new phase of the Higgs field. From a general Higgs potential which is renormalizable and invariant under UPQ(1) transformation, we consider the interaction of the axion with leptons and quarks. Based on these results, axion production in e+e− collisio...

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  • Squark decays into charginos and neutralinos in the MSSM with complex parameterSquark decays into charginos and neutralinos in the MSSM with complex parameter

    I. INTRODUCTION The minimal supersymmetric standard model (MSSM) is one of the most promising extensions of the Standard Model. The MSSM predicts the existence of scalar partners to all known quarks and leptons. Each fermion has two spin zero partners called sfermions f˜L and f˜R, one for each chirality eigenstate: the mixing between f˜L and f˜...

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  • Structural analysis of liquid 3D transition metals using charged hard sphere reference systemStructural analysis of liquid 3D transition metals using charged hard sphere reference system

    Abstract. The Charged Hard Sphere (CHS) reference system is applied to study the structural analysis of liquid 3d transition metals. Here we report the structure factor S(q), pair distribution function g (r), interatomic distance r1 of nearest neighbour atoms and coordination number n1 for liquid 3d transition metals viz: Ti, V, Cr, Mn, Fe, Co, Ni...

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  • A method for calculation of morse potential for fcc, bcc, hcp crystals applied to Debye-Waller factor and equation of stateA method for calculation of morse potential for fcc, bcc, hcp crystals applied to Debye-Waller factor and equation of state

    Abstract. Analytical expressions for the Morse potential parameters for fcc, bcc and hcp crystals have been developed. They contain the energy of sublimation, the compressibility and the lattice constant. Numerical results for Cu (fcc), W (bcc) and Zn (hcp) agree well with the measured values. Debye-Waller factors in X-ray absorption fine struct...

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  • Gain and noise in Erbium-doped fiber amplifier (EDFA) - A rate equation approach (REA)Gain and noise in Erbium-doped fiber amplifier (EDFA) - A rate equation approach (REA)

    I. INTRODUCTION EDFA are currently attracting increased interest, especially for use in optical communication wavelength-division multiplexed (WDM) systems. The main reason is the possiblility of compensating for optical fiber losses in broad wavelength ranges and developing a large-capacity, long-distance transmission system. The performance of ...

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  • Sắc số, đa thức tô màu và tính duy nhất tô màu của đồ thị tách cựcSắc số, đa thức tô màu và tính duy nhất tô màu của đồ thị tách cực

    TÓM TẮT Khái niệm đồ thị tách cực được định nghĩa vào năm 1977 bởi S. Foldes và P.L. Hammer. Các đồ thị này đã và đang được nghiên cứu nhiều bởi vì chúng có liên quan các vấn đề tổ hợp và khoa học máy tính như bài toán đóng gói và xếp ba lô trong quy hoạch nguyên, lý thuyết matroid, nghiên cứu hàm Boolean, giải quyết việc xử lý song song trong ...

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  • Investigation on energy efficiency of lighting system in a university libraryInvestigation on energy efficiency of lighting system in a university library

    ABSTRACT The electrical lighting system is one of the most significant contributors to energy consumption and operational cost for a library building. The extended operation of the lighting system in the library building consumes a high amount of energy, which requires the adoption of energy efficiency implementation to reduce energy consumptio...

    pdf17 trang | Chia sẻ: thanhle95 | Ngày: 16/07/2021 | Lượt xem: 250 | Lượt tải: 0