http://tainguyenso.vnu.edu.vn/jspui/handle/123456789/12098 2026-05-17T19:32:28Z 2026-05-17T19:32:28Z Nguyen, Quy Thuong http://tainguyenso.vnu.edu.vn/jspui/handle/123456789/12348 2011-06-08T17:04:42Z 2010-01-01T00:00:00Z

Verification of hazard, race and deadlock in GALS-circuit Nguyen, Quy Thuong It is not easy to point out Hazards and Deadlock in a circuit with a complex structure. Determination methods for Hazard, Race, Deadlock in [1-3] cannot be applied to this case. With complex circuit structure, specific solution must be offered for each circuit type such as solution of synchonization for asynchronous circuits [4]. GALS circuit is a complex circuit system; thus, the above-mentioned solution is also applied to this circuit

2010-01-01T00:00:00Z Tran, Vinh Thang et al. http://tainguyenso.vnu.edu.vn/jspui/handle/123456789/12347 2011-06-08T16:56:43Z 2010-01-01T00:00:00Z

Reconfigurable instruments for experiments in physics – the speed of sound measurement Tran, Vinh Thang; et al. This paper describes the applications of reconfigurable devices in scientific instruments and demonstrates the implementation of an instrument for measuring the speed of sound in the air. This is a simple and inexpensive instrument which is easy to use, portable and very useful for teaching physics.

2010-01-01T00:00:00Z Bui, Van Loat et al. http://tainguyenso.vnu.edu.vn/jspui/handle/123456789/12346 2011-06-08T16:53:05Z 2010-01-01T00:00:00Z

Monte carlo simulation by code of MCNP and experimental check for measuring thickness of materials for the specializing system of MYO-101 Bui, Van Loat; et al. At present, thickness measurement of materials based on effect of backscattering gamma-ray has been widely used in industry in our country. The report presented research in measuring thickness of some materials such as paper, plastic, aluminum and steel with using the dedicated system of MYO-101, having scintillation detector of YAP(Ce) and gamma-ray of 60 keV of Am-241 source, by Monte-Carlo simulation using the code of MCNP. The simulation was checked by experimental measurements. The results were shown that they were in accordance with the range of error. This research has been useful for training activities with a view of human resources development in the field of application of nuclear technique in industry in Vietnam.

2010-01-01T00:00:00Z Trinh, Thi Loan et al. http://tainguyenso.vnu.edu.vn/jspui/handle/123456789/12345 2011-06-08T16:49:18Z 2010-01-01T00:00:00Z

Effect of Cr$^{3+}$ concentration on structural and optical properties of ZnAl$_2$O$_4$:Cr$^{3+}$ Trinh, Thi Loan; et al. Zn(Al$_{1-x}$Cr$_x$)$_2$O$_4$ powders with Cr$^{3+}$ contents ranging from x = 0.005 to 0.3 have been synthesized by sol-gel method using the following precursors: zinc nitrate (Zn(NO$_3$)$_2\cdot6$H$_2$O), aluminium nitrate (Al(NO$_3$)$_3\cdot9$H$_2$O), chrome nitrate (Cr(NO$_3$)$_3\cdot9$H$_2$O), and citric acid. The effect of the Cr$^{3+}$ concentration on structural and optical properties of the synthesized samples has been studied. For the samples with low Cr$^{3+}$-dopant concentrations, the photoluminescent (PL) spectra consist of sharp lines assigned to the $^2$E($^2$G) $\to$ $^4$A$_2$($^4$F) transition of ions Cr$^{3+}$ in strong octahedral field. But for the samples with high Cr$^{3+}$-dopant concentrations, the PL spectra consist of a broad band centered at longer wavelengths assigned to the $^4$T$_2$($^4$F) $\to$ $^4$A$_2$($^4$F) transition of ions Cr$^{3+}$ in weak octahedral field.

2010-01-01T00:00:00Z