12 articles in this issue
Pham Thi Thanh Nga,Nguyen Toan Thang
We study the magnetic ordered phases of the spin -12-\frac{1}{2} Heisenberg antiferromagnetic model with nearest J1J_1 and next nearest neighbor J2J_2 exchange interactions on the square lattice using fermionic representation of spin operators within Pop... see more
Ha Thanh Hung,Le Tho Hue,Nguyen Thi Thu Hang,Pham Ngoc Thu
We calculate the mass of the lightest neutral CP-even Higgs in the frame work of the supersymmetric reduced minimal 3-3-1 model (SUSYRM331) at one-loop level. Like MSSM, at tree level this value of mass is smaller than that of mZ=92m_Z=92 GeV, inconsisten... see more
Nguyen Thi Thuy Hang
Melting of crystalline silicon nanoparticles is studied by molecular dynamics (MD) simulations using Stillinger-Weber potential. Models are heated up from a crystalline to a normal liquid state. Temperature dependence of total energy and the Lindemann rat... see more
Dinh Xuan Khoa,Le Van Doai,Pham Van Trong,Tran Manh Cuong,Vu Ngoc Sau,Nguyen Huy Bang,Le Nguyen Mai Anh
Using density-matrix theory, an analytical expression of the self-Kerr nonlinear coefficient of a three-level lambda EIT medium for a weak probe light is derived. Influences of the coupling light and Doppler broadening on the self-Kerr coefficient are inv... see more
Nguyen Ngoc Hai,Nguyen Hai Yen,Duong Thi Giang,Nguyen Duc Nhat,Pham Thu Nga,Dao Tran Cao
This report presents the results of ternary alloy quantum dots (TQDs) manufacturing and its superior optical properties to fabricate the biosensor for pesticide detection. The explanation for the changes in PL intensity based on the change of electroni... see more
Ta Anh Tan,Do Thi Phuong,Nguyen Thi Tu Oanh,Do Xuan Mai,Hoang Vu Chung,Le Ha Chi,Dang Tran Chien,Pham Duy Long
Sodium Manganese Oxide (NaxMnO2) has attracted much attention as cathode materials for alkaline ion battery due to the ability of fast charge and discharge ion Na+, in particular in nanoscale. We report on the synthesis of NaxMnO2 nanowires via hydrotherm... see more
Pham Vu Thinh,Le Ngoc Anh
In many solid state laser pumped by flash lamps, thermal source distributed in laser rod is heterogeneous, complicated and cannot be described by explicit functions. Pumping process can be considered an adiabatic process. Thermal gradients generated withi... see more
Nguyen Xuan Tuan,Dinh Van Trung,Nguyen Thanh Binh,Bui Van Hai
The molecular density and temperature profiles of the stratosphere in Hanoi are measured by a Rayleigh lidar. The profiles have the spatial resolution of 120 m and the temporal resolution of 1h. Their bottom height and top height are 20 km and 57 km, resp... see more
Nguyen Thi Phuong,Pham Ngoc Diep,Darriulat Pierre,Pham Tuyet Nhung,Pham Tuan Anh,Pham Ngoc Dong,Do Thi Hoai,Nguyen Thi Thao
A detailed account of the performance of the VATLY radio telescope, operated in HaNoi on and near the 21 cm HI line, is given. Drift scans across the Sun are used to measure the dependence of the gain on frequency and power, revealing small nonlinearities... see more
Cao Xuan Quan,Vu Khanh Xuan,Luu Thi Lan Anh,Vo Thach Son
High power chip on board light emitting diode (HPCOBLED) are a promising solid state light technology for a variety of lighting applications. In this study, we studied temperature effect on luminous flux of HPCOBLED using VMI-PR-001 system ... see more
Ly Ngoc Tai,Dao Thi Hoa,Le Van Hong
In this paper we report new abnormal photoluminescence results of TiO2_{2} nanocrystal particles and nanotube arrays. Photoluminescence spectra were recorded for TiO2_{2} nanocrystal particles and nanotube arrays that were synthesized by a wet chemical... see more
Le Tuan Tu,Luu Van Thiem
This paper represents the fabrication of CoNiP single segment and CoNiP/Au multisegment nanowires. We have fabricated these nanowires by electrodeposition method into polycarbonate templates with a nominal pore diameter about 100 nm. The hystersis loops w... see more