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ISSN:    frecuency : 4   format : Electrónica

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Volume 24 Number 3S2 Year 2014

21 articles in this issue 

Chu Thuy Anh,Pham Thi Kim Hang,Pham Van Dien,Tran Thi Thanh Van,Nguyen Tri Lan,Nguyen Ai Viet

The equivalent between Bose and Fermi ideal gases is usually taken in high temperature limit only. Recently, there has been considerable interest in surprising thermodynamic ``equivalences'' between certain ideal Bose and spineless Fermi gas systems in lo... see more

Pags. 146–150  

Chu Thuy Anh,Dao Hong Lien,Nguyen Tri Lan,Nguyen Ai Viet

The econophysics methods are used to study the financial fluctuation of Hanoi Stock Exchange (HNX) and Hochiminh Stock Exchange (HSX) in comparison to Dow John Industrial Average's one. The study has been made both on panic period (2007-2008) and on norma... see more

Pags. 151–156  

Nguyen Van Hao,Pham Hong Minh,Pham Van Duong,Nguyen Dai Hung,Nguyen The Binh

We have numerically investigated, for the first time, the optical performance and characteristics of diode-end-pumped passively Cr4+^{4+}:YSO Q-switched solid-state Cr3+^{3 + }:LiSAF lasers using a rate equation system extended to multi-wavelength. Homo... see more

Pags. 71–84  

Le Hong Khiem,Nguyen The Nghia,Vi Ho Phong,Bui Van Loat

The main purpose of this work is to establish a method of elemental analysis by Proton-Induced X-ray Emission (PIXE) technique on thick samples. Our study has been carried out at Hanoi University of Science (HUS) using a 5SDH-2 Tandem accelerator. The X-r... see more

Pags. 1 - 7  

Phung Van Dong

We review the main contribution of the Division for Theoretical Particle Physics at the  Institute ofPhysics, VAST  in building the models based on SU(3)C?SU(3)L?U(1)X\text{SU}(3)_C\otimes \text{SU}(3)_L \otimes \text{U}(1)_X  gauge unifica... see more

Pags. 13 - 17  

Bui Quyet Thang,Do Thi Huong

We shortly review the metric formalism for the f(R)f(R)  gravity.  Based on the metric formalism, westudy the spherically symmetric static empty space solutions with the gravity LagrangianL=R+?R2L=R+\lambda R^2. We found the general metric that ... see more

Pags. 23 - 28  

Nguyen Xuan Tuan,Dinh Van Trung,Nguyen Thanh Binh,Bui Van Hai

The nitrogen molecular density and temperature profiles of the upper troposphere are measured by a Raman lidar system in Hanoi over the range from 3 km to 19 km. The spatial and temporal resolutions of profiles are 60 m and 1h, respectively. The nitrogen ... see more

Pags. 52 - 62  

Do Hoang Tung,Bach Sy Minh,Vu Thi Thom,Lam Thi Huyen Trang,Cao Thi Huong,Nguyen Thi Tuyen

A cold atmospheric pressure gliding arc plasma jet hasbeen developed and applied to disinfection. The size of the plasma output is about 6 mm in diameter and 10 mm in length. Ar gas at a flow rate of 10 slm and 25 W plasma power are used. Plasma discharge... see more

Pags. 103 - 108  

Nguyen Van Hao,Pham Van Duong,Pham Hong Minh,Do Quoc Khanh,Antonio Agnesi

We present the design and development of folded four-mirror resonators for diode end-pumped solid-state Cr:LiSAF lasers. The astigmatic effects due to the Brewster-cut laser crystal and two curved mirrors used at oblique incidence were taken into consi... see more

Pags. 109 - 120  

Chu Viet Ha,J. C. Brochon,Tran Hong Nhung

The influence of the surface plasmon of gold nanoparticles on the optical properties of the fluorescent nanoparticles in aqueous solution have been investigated. The fluorescence of nanoparticles can be enhanced or quenched in the presence of gold nanopar... see more

Pags. 121 - 129  

Nguyen Thanh Binh

The fluorescence quantum yield or the efficiency of the fluorescence process is defined as the ratio of the number of photons emitted to the number of photons absorbed. In this report the experimental method to determinate photo luminescence (PL) quantum ... see more

Pags. 135 - 140  

Nguyen Thi My An,Nghiem Thi Ha Lien,Vu Duong,Nguyen Thanh Thuy,Do Quang Hoa

Spherical gold nanoparticles doped dye solution was used for laser active medium. Fluorescence and absorption spectral shapes of laser dye molecules were modified by the resonance energy transfer between gold nanoparticles due to localized surface plasmon... see more

Pags. 141 - 145