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
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
Nguyen Van Tan,Do Hoang Tung,Rainer Hipler
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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
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
Le Hong Khiem,Tran Dinh Trong,Nguyen The Nghia
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
Nguyen Danh Tung,Hoang Anh Tuan
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
Nguyen Van Do,Pham Duc Khue,Kim Tien Thanh,Nguyen Thi Hien,Kim Guinyun
Pham Duc Khue,Nguyen Van Do
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
Nghiem Thi Ha Lien,Vu Thi Thuy Duong,Vu Duong,Do Quang Hoa,Tran Hong Nhung
Vu Thuy Duong,Trinh Thi Thuong,Nghiem Thi Ha Lien,Do Quang Hoa,Tran Hong Nhung
Pham Hong Minh,Pham Van Duong,Pham Huy Thong,Do Quoc Khanh,Nguyen Dai Hung,Nobuhiko Sarukura
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
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
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
Nguyen Thi Khanh Van,Nguyen Dinh Hoang,Nguyen Thanh Binh,Nguyen Cong Thanh,Pham Kim Binh
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
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