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Effects of low energy (160 keV) X-ray on microbial inactivation,sprouting inhibition and genetic variation in potato

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Food Bioscience 2022年第3期47卷 262-270页

作者： Nguyen An Son Nguyen Thi Nguyet Ha Nguyen Thi Minh Sang Le Doan Dinh Duc Le Ngoc Trieu Faculty of Physic and Nuclear Engineering Da Lat UniversityViet Nam dalat Vocational Training College Viet Nam Faculty of Biology Da Lat UniversityViet Nam

The effects of low energy X-ray irradiation on microbial inactivation,sprouting inhibition and genetic variation were *** was an inverse correlation between the exposure dose in range of 0 Gy–5000 Gy and the survival rate of *** dose of 1000 Gy seemed to be suitable for inactivation of microorganisms because the respective survival rate is relatively low (0.59%).Dose rate of 13.87 Gy/min was the most appropriate to inactivate the microorganisms,with the survival rate of 0.37%.Applying the irradiation dose of 1000 Gy and dose rate of 13.87 Gy/min,there was a significant sprouting inhibition of irradiated potatoes compared to the control for six months *** effect of irradiation dose (100–1200 Gy) and dose rate (8.63–19.62 Gy/min) on genetic variation of the irradiated samples was assessed by DNA fingerprints induced from using three molecular techniques including Random Amplified Polymorphic DNA (RAPD),Start Codon Targeted Polymorphism (SCoT) and CAAT box – derived polymorphism (CBDP).At the irradiation dose of 1000 Gy and dose rate of 13.87 Gy/min,the level of genetic variation was relatively low (4.85%).Thus,this treatment is a suitable condition of irradiation for potato treatment with the purpose of preservation.

关键词： Dose Dose rate Low energy X-ray Microbial inactivation Potato

A Design Configuration of an FPGA-Based Coincident Spectrometry System

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Journal of Analytical Sciences, Methods and Instrumentation 2013年第3期3卷 158-162页

作者： Pham Dinh Khang Nguyen Nhi Dien Dang Lanh Nguyen Xuan Hai Pham Ngoc Tuan Nguyen Duc Hoa Nguyen An Son Nuclear Research Institute Dalat Vietnam Nuclear Training Center Hanoi Vietnam university of dalat Dalat Vietnam university of dalat Dalat Vietnam.

In the past, most of popular coincidence spectrometers were normally based on traditional electronics techniques such as time to amplitude conversion or logic selecting coincidence unit. They were complicated and it is not convenient for us to use them. This paper deals with a new design of a contemporary coincidence spectrometer which is based on Field Programmable Gate Arrays (FPGA) devices via Digital Signal Processing (DSP) techniques with Hardware Description Language (VHDL). The outstanding advantage of DSP techniques and FPGA technology is capable of enhancement of the quality of the experimental measurements for nuclear radiation. The designed configuration of the traditional system was tested on the PCI 7811R board of National Instruments while the digital systems were establishing with FPGA devices. The purpose of this work is referring to the principle for construction of an FPGA-based system capable of replacing a conventional system. Therefore, a novel approach for in-house development of digital techniques is presented. The method for designing the system is utilization of slow-fast coincidence configurations with two HPGe detectors obtaining a pair of coincidence events, processing data in DSP algorithms. The significant and noticeable results are the operating frequency of 80 MHz and system timestamp window of approximately 10 ns.

关键词： Digital Signal Processing FPGA VHDL

Generally Covariant Duality and Tachyon of Cosmological Nature

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Journal of Modern Physics 2014年第18期5卷 2106-2110页

作者： Dao Vong Duc Phu Chi Hoa Institute of Physics Hanoi Vietnam dalat university Dalat Vietnam

In this work the concept of generally covariant duality is treated with the introduction of generalized Levi-Civita tensor within the framework of vierbein formalism. The equations for the attached Lorentz scalar fields are derived from vierbein postulate. It is shown that the masses of the associated particles including that with negative square mass are completely determined by Einstein’s cosmological constant.

关键词： General Relativity Cosmology Tachyon

Development of 24 and 59 keV Filtered Neutron Beams for Neutron Capture Experiments at dalat Research Reactor

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World Journal of Nuclear Science and Technology 2014年第2期4卷 59-64页

作者： Pham Ngoc Son Vuong Huu Tan Phu Chi Hoa Tran Tuan Anh Nuclear Research Institute Dalat Vietnam The university of dalat Dalat Vietnam Vietnam Agency for Radiation and Nuclear Safety Hanoi Vietnam

External filtered neutron beams have been developed at the horizontal radial channels No. 4 of dalat research reactor. In the material composition of the neutron filters, the primary material components of Iron, Aluminum, Nickel and Vanadium are used to obtain the mono-energetic neutron beams of 24 and 59 keV, with low level of Gamma and slow neutron background. A computer code and Monte-Carlo simulation technique were applied to optimize the filter configurations and to deduce the neutron energy distributions in the filtered beams. A hydrogen-filled proton recoil detector and the activation method with Gold foils were used to measure the neutron energy spectrum and flux of each beam at sample position. The results of experimental neutron fluxes are 6.1 × 105 and 5.3 × 105 n/cm2/s for 24 and 59 keV beams, respectively.

关键词： Research Reactor Filtered Neutron 24 keV 59 keV

Characteristics of Filtered Neutron Beam Energy Spectra at dalat Reactor

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World Journal of Nuclear Science and Technology 2014年第2期4卷 96-102页

作者： Tran Tuan Anh Pham Ngoc Son Vuong Huu Tan Pham Dinh Khang Phu Chi Hoa Nuclear Research Institute Dalat Vietnam The university of dalat Dalat Vietnam Vietnam Agency for Radiation and Nuclear Safety Hanoi Vietnam

Filtered neutron technique was applied for producing quasi-monoenergetic neutron beams of 24 keV, 54 keV, 133 keV and 148 keV at the horizontal neutron channel No. 4 of the dalat Nuclear Research Reactor. The study on physical characteristics of these beam lines has been carried out for efficient applications in neutron capture experiments. The filtered neutron spectrum of each beam has been simulated by Monte-Carlo method and experimentally measured by a gas-filled protonrecoil spectrometer. The neutron fluxes of these filtered beams were measured by the activation technique with standard foils of 197Au, using a high efficient HPGe digital gamma-ray spectrometer.

关键词： Neutron Filter Proton-Recoil

Gamma Cascade Transition of 51V(nth, g )52V Reaction

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World Journal of Nuclear Science and Technology 2014年第1期4卷 40-45页

作者： Pham Dinh Khang Nguyen Xuan Hai Ho Huu Thang Vuong Huu Tan Nguyen An Son Nguyen Duc Hoa Nuclear Research Institute Dalat Vietnam Nuclear Training Center Hanoi Vietnam university of dalat Dalat Vietnam Vietnam Agency for Radiation and Nuclear Safety Hanoi Vietnam

The thermal neutron capture gamma radiations for 51V(n, g)52V reaction have been studied at dalat Nuclear Research Reactor (DNRR). The gamma two-step cascade transition was measured by event-event coincidence spectrometer. The added-neutron binding energy in 52V was measured as 7.31 MeV. Energy and the intensity transition of cascades were consistent with prediction of single particle model. Furthermore, the spin and the parity of levels were confined.

关键词： Gamma Two-Step Cascade Neutron Capture Reaction Coincidence

Spectroscospy method for determination of Thorium with Azocalix[4]arene

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Spectroscospy method for determination of Thorium with Azoca...

Control Rod Calibration and Worth Calculation for Optimized Power Reactor 1000 (OPR-1000) Using Core Simulator OPR1000

International Conference on Biology, Environment and Chemistry（ICBEC 2010）

作者： Tran Quang Hieu Le Van Tan Nguyen Ngoc Tuan Saigon Technology university Ho Chi Minh City university of Industry dalat nuclear research Institutive

ISBN: (纸本)9789810886424

A research of possible application of azocalixarene for evaluation of thorium content was *** on the complex of Ortho-Ester Tetra-Azophenylcalix[4]arene(TEAC) with Thorium(IV) in acetate buffer solution,the precision,reproducibility and interference of foreign metal ions were *** these results,a new method has been built to determine *** this recommended method could be applied for determination of thorium concentration in some monazite ore with high confident results.

关键词： Azocalixarene,Spectroscopy,Thorium,Complex,Molecular Mechanism,Calculation.

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World Journal of Nuclear Science and Technology 2017年第1期7卷 15-23页

作者： Nguyen An Son Nguyen Duc Hoa Tran Trung Nguyen Tran Quoc Tuan Osvaldo Camueje Raul dalat university Da Lat Vietnam Agostinho Neto university Luanda Angola

Control rod is used to change the power in nuclear reactor.?Certainly, the core at any moment can be made subcritical condition and shut downs when occurring?to emergency instance in the core. The rod is grouped based?on their function and located at different places in the core where their feature is maximized.?Two methods of control rod calibration are the asymptotic period method and the rod-drop method, which were applied in this experiment. In the first method, the reactor is made supcritical by inserting the control rod to be calibrated a certain level. The rod drop method is to determine the subcritical;at the critical state, the rod to be calibrated is dropped into the core, and the resulting decay of neutron flux is observed and related to the reactivity. In this paper, the regulating rod will be calibrated according to the reactivity in OPR-1000 that corresponds to a certain control rod insert or withdraw, and the reactivity in power reactor depends?on the integral and differential control rod group too. The core simulator OPR1000 is used to test those methods.

关键词： Control Rod The Asymptotic Period Method The Rod-Drop Method Core Simulator OPR1000

Taxonomic notes of three tea-plants(Camellia ***)recently described in Vietnam

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Beverage Plant Research 2022年第1期2卷 174-176页

作者： Nguyen Trung Thanh Luong Van Dung Le Nguyet Hai Ninh Quang Cuong Truong Shixiong Yang Faculty of Biology VNU University of Science334 Nguyen TraiHanoi 100000Vietnam Faculty of Biology Dalat UniversityPhu Dong ThienVuong str.01Dalat66106Lam DongVietnam Faculty of Nong Lam Hoa Lu UniversityNinh Binh 40000Vietnam Bidoup Nui Ba National Park Tran Hung Dao str.5EDalat66116Lam DongVietnam CAS Key Laboratory for Plant Diversity and Biogeography of East Asia Kunming Institute of BotanyChinese Academy of SciencesKunming 650201YunnanChina

Camellia sinensis *** is a heterotypic synonym of *** *** flosculora and *** were excluded from ***.

关键词： notes Vietnam Camellia