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Volume 21 Number 1 Year 2011

14 articles in this issue 

Comm. Phys.

Cover 1 and Contents Volume 21 Number 1, 2011

Pags. 0  

Tran Huu Phat,Phan Thi Duyen

The two interacting complex scalar fields at finite density is considered in the mean field approximation. It is shown that although the symmetry is spontaneously broken for the chemical potentials bigger than the meson masses in vacuum, but the Goldstone... see more

Pags. 1  

Phung Kim Phu,Nguyen Minh Thuan,Tran Nam Trung,Nguyen Van Minh

We present the synthesis and detailed characterization of RbxMn[Fe(CN)]6 and Mn3[Cr(CN)6]2 compounds. The composition of the materials significantly depends on the preparation conditions. Analysis of Raman spectroscopic results and X-ray powder diffractio... see more

Pags. 19  

Vu Van Hung,Ho Khac Hieu

In present article, the anharmonic correlated Einstein model has been used to study the temperature dependence of Extended X-ray absorption fine structure (EXAFS) cumulants of silicon and germanium crystals. The analytical expressions of the first, second... see more

Pags. 25  

Pham Duc Thang

In this paper a study on small-angle neutron-scattering (SANS) of the Fe-Pt-Al alloys was presented. The scattering intensities in an external magnetic field of 1.2 T, perpendicular to the neutron-beam direction, are significantly smaller than these in th... see more

Pags. 35  

Vu Thi Thai Ha,Nguyen Thi Quy Hai,Nguyen Ngoc Long

In the current work the glow curves for LiF:Mg,Cu,Na,Si thermoluminescent material were measured and analyzed by using a function approximating to the well-known Randall-Wilkins first-order expression. The influence of different heating rates on thermolum... see more

Pags. 43  

Nguyen Nang Dinh,Le Ha Chi,Tran Thi Chung Thuy,Thien Phap Nguyen

In this work we present spectroscopic and photoluminescent properties of nanostructured polymeric composite films of nanocrystalline TiO2 and polyfuorenes (PF+nc-TiO2). The films were deposited onto glass and KBr substrates by spin-coating PF-in-toluene s... see more

Pags. 51  

Dang Tran Chien,Pham Duy Long,Pham Van Hoi,Le Ha Chi

The incorporation of cadmium sulfide (CdS) into TiO2 nanoparticle thin films was investigated. The nanoparticle TiO2 thin film onto an indium doped–tin oxide (ITO) substrate was deposited by Electron Beam Deposition (EBD) combined with thermal process. Th... see more

Pags. 57  

Nghiem Thi Ha Lien,Vu Xuan Hoa,Vu Thi Thuy Duong,Nguyen Van Tinh,Tran Hong Nhung

The gold nanoparticle solutions are well known as an extremely sensitive biomedical analytical tool due to the strong dependence of their absorption in the visible range on the environment. In this work, the colloidal nano golds were synthesized from meta... see more

Pags. 63  

Ho Quang Quy,Hoang Dinh Hai,Hoang Van Nam

In this article expresions used to simulate the trap stiffness k of the optical trap are derived. The influence of principle parameters as total energy, beam waist and duration of pulsed laser beam, radius of dielectric particle, and viscosity of surround... see more

Pags. 71  

Vu Van Hung,Hoang Van Tich,Dang Thanh Hai

The melting temperature of metals are studied using the statistical moment method, going the quasi-harmonic appromations. The melting temperature of metals are calculated as a function of the pressure. We discuss the pressure dependence of melting tempera... see more

Pags. 77  

Ho Quang Quy,Nguyen Van Hoa,Nguyen Thi Thanh Tam

In this article, the reshaping of the series of sinuous pulses and Gaussian pulses with arbitrary amplitude of laser signal by two-port nonlinear fiber Mach-Zehnder interferometer are simulated. The output series of close to flat-form pulses of laser sign... see more

Pags. 83  

Do Thuy Chi,Bui Huy,Nguyen Thuy Van,Pham Van Hoi

We present the fabrication, simulation, and measurements of 1D photonic crystal based on nano-porous silicon multilayer designed as an optical interference filter. Using electro-chemical etching with timely repeat steps of applied current densities, we fa... see more

Pags. 89