• Hiệu ứng âm điện từ trong hố lượng tửHiệu ứng âm điện từ trong hố lượng tử

    TÓM TẮT Hiệu ứng âm điện từ trong hố lượng tử được khảo sát với sóng âm có bước sóng =2π/q nhỏ hơn quãng đường tự do trung bình ℓ của điện tử và trong miền siêu âm qℓ>>1 (ở đây q là số sóng âm). Biểu thức giải tích của dòng âm điện từ jAME được tính toán bằng cách sử dụng phương trình động Boltzmann cho điện tử tương tác với sóng âm trong trườ...

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  • Elemental analysis of the ancient bronze coins by X-ray fluorescence technique using simultaneously radioisotope source and X-ray tubeElemental analysis of the ancient bronze coins by X-ray fluorescence technique using simultaneously radioisotope source and X-ray tube

    Abstract. The results on elemental analysis of the vietnamese ancient bronze coins during the time of the Nguyen dynasty (19th century) are presented. The samples were provided by the Vietnam National Historical Museum and the elemental analysis was performed on the home-made model EDS-XT-99-01 X-ray fluorescence spectrometer in the Institute of...

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  • 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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