Tài liệu miễn phí Năng lượng
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Dynamic behaviour of nuclear island structure of AP1000 under El Centro and Dien Bien earthquakes
This paper presents a seismic analysis of the AP1000 nuclear island structure by using the computational finite element software ANSYS. A 3D finite element model for the structure is developed and its dynamic response, including the time histories for displacements, velocities and accelerations, deformed configurations and von Mises stresses of the structure are obtained for America El Centro (6.9 Richter) and Vietnam Dien Bien (5.3 Richter) earthquakes.
11/29/2019 3:10:03 AM +00:00
Influence of adult diet and exposure to methyl eugenol in the mating performance of Bactrocera correcta
The Guava fruit fly Bactrocera correcta is serious pest attacking Dragon fruit (Hylocereus undatus and Hylocereus polyrhizus ). The study on the impact of (i) Protein in adult diet on sexual maturity of Guava fruit fly; (ii) Methyl eugenol (ME) feeding on sterilized male of Guava fruit fly; and (iii) Longevity of sterilized males and females feeding on different diets.
11/29/2019 3:09:53 AM +00:00
Identification of some nucleotide mutations in Waxy gene (BGIOSGA022241) of a mutant rice line
Waxy genes of the original variety and its mutant type were sequenced by Sanger method and compared through Nucleotide Basic Local Alignment Search Tool (BLASTN) to clarify differences. BLASTN result showed four nucleotide mutations in coding regions and 59 nucleotide mutations in noncoding regions.
11/29/2019 3:09:40 AM +00:00
Effect of morphological algorithms on medical imaging
Handling and improving the quality of medical images with the help of computer software is one of the important stages in the diagnosis and treatment. In this article, we focus on describing the new morphological algorithms by ITK (Insight Segmentation and Registration Toolkit).
11/29/2019 3:09:30 AM +00:00
Development of an alpha fast-slow coincidence counter for analysis of 223Ra and 224Ra in seawater
An alpha fast-slow coincidence counter has been designed and manufactured for measuring the low alpha activities of 223Ra and 224Ra in the seawater. In this work, Radium from the seawater was absorbed onto a column of MnO2 coated fiber (Mn fiber).
11/29/2019 3:09:21 AM +00:00
Hydrothermal synthesis and characteristics of lanthanumdoped pb(Zr0.65Ti0.35)O3 ceramics
Lanthanum-doped lead zirconate titanate (PLZT) powders were synthesized using the hydrothermal method. The influence of pH, reaction temperature and time, lanthanum concentration on the formation and characteristics of PLZT were investigated.
11/29/2019 3:09:11 AM +00:00
Estimation of radiological parameters associated with mining and processing of coastal sand in Binh Dinh province, Vietnam
This paper presents radiological parameters associated with mining and processing ilmenite minerals in coastal sand for titanium for export in Binh Dinh province, Central Part of Vietnam.
11/29/2019 3:09:00 AM +00:00
Using a delayed coincidence counting system to determine 223Ra, 224Ra in seawater sample
A Radium Delayed Coincidence Counter (RaDeCC) includes 3 channels ( 223Ra channel, 224Ra channel, and total channel). It has been newly designed and assembled at Nuclear Research Institute. To determine 223Ra and 224Ra in seawater samples, the system efficiency at all 3 channels were investigated and calibrated.
11/29/2019 3:08:49 AM +00:00
Calculation of response functions for cylindrical nested neutron spectrometer
In a recent work, a new neutron spectrometer, namely Cylindrical Nested Neutron Spectrometer (CNNS). It works under the same principles as a Bonner Sphere Spectrometer (BSS), except that different amounts of moderator around a thermal neutron detector are configured by adding or removing cylindrical shells.
11/29/2019 3:08:39 AM +00:00
Uncertainty quantification of RELAP5/MOD3.3 for interfacial shear stress during small break LOCA
The Best-Estimate Plus Uncertainty (BEPU) is applied as Deterministic Approach for safety analysis of Nuclear Power Plant using the system analysis code. The system analysis code such as Relap5/Mod3.3 is required to be able to simulate the thermal-hydraulic behavior of nuclear reactor in some accident scenarios.
11/29/2019 3:08:29 AM +00:00
Study on the determination of 10B/11B isotope ratio in water samples by isotope dilution – inductively coupled plasma mass spectrometry (ID-ICPMS)
The determination of 10B/11B isotope ratio and boron concentration in various water samples using isotope dilution technique with inductively coupled plasma mass spectrometry (ICPMS) was studied.
11/29/2019 3:08:17 AM +00:00
Some initial results of simulating a positron beam system by using SIMION
Slow Positron Beam (PB) is an important device in the study of positron physics and techniques, especially in material research. For the purpose of conceptual designing a PB system, we have simulated a PB system with the parameters of an existing system – SPONSOR, using SIMION software.
11/29/2019 3:08:07 AM +00:00
Development of measurement methods and dose evaluating algorithms for electronic personal dosimeter
For personal radiation dose monitoring, electronic personal dosimeters (EPD), also known as active personal dosimeter (APD), using silicon diode detector have the advantage capability of measuring and displaying directly the exposure results of gamma, beta and neutron radiations in real time.
11/29/2019 3:07:57 AM +00:00
Preperation of nanochitosan from radiation degraded oligochitosan for shelf life extension of strawberry
Oligochitosans (OCT) were prepared from chitosan (CTS) by gamma irradiation technique. The parameters affecting to the chitosan degradation were studied. And then, OCT nanoparticles wereformed using the method of tripolyphosphate (TPP) cross-linking. Effect of concentration and molecular weight of OCT, concentration of TPP on particle size of the formed OCT nanoparticles were also studied.
11/29/2019 3:07:46 AM +00:00
The effect of combined treatment with sodium dichloroisocyanurate and electron beam irradiation in controlling mold (Lasiodiplodia theobromae) on star apples
Lasiodiplodia theobromae causes decay of star apple fruits (Chrysophyllum cainino) during harvest, transport and storage. If the irradiation dose is higher than 800 Gy, this mold will be controlled.
11/29/2019 3:07:35 AM +00:00
Predicting behavior of AP-1000 nuclear reactor fuel rod under steady state operating condition by using FRAPCON-4.0 software
This paper reports the results on the predictions of behavior of AP-1000 nuclear reactor fuel rod under steady state operating condition by using FRAPCON-4.0 software. The predictive items were the temperature distribution in the fuel rod, including fuel centerline temperature, fuel pellet surface temperature, gas temperature, cladding inside and outside temperature, oxide surface and bulk coolant temperature; and gap conductance and thickness.
11/29/2019 3:07:25 AM +00:00
Characteristics of a gas-cooled fast reactor with minor actinide loading
This paper presents the neutronics characteristics of a prototype gas-cooled (supercritical CO2-cooled) fast reactor (GCFR) with minor actinide (MA) loading in the fuel. The GCFR core is designed with a thermal output of 600 MWt as a part of a direct supercritical CO2 (S-CO2) gas turbine cycle.
11/29/2019 3:07:15 AM +00:00
Calculation of critical core configurations of a research reactor using MTR, IRT-4M, VVR-KN fuel assemblies
This paper presents calculation results to determine critical core configurations and a minimum number of fuel assemblies (FAs) or uranium mass of a research reactor loaded with three types of FAs such as MTR, IRT-4M and VVR-KN. The MCNP5 code and ENDF/B7.1 library were applied to estimate characteristics parameters of the fuel types and the whole core.
11/29/2019 3:07:05 AM +00:00
Application of correlation pattern recognition technique for neutron– gamma discrimination in the EJ-301 liquid scintillation detector
The ability to distinguish between neutrons and gamma-rays is important in the fast - neutron detection, especially when using the scintillation detector. A dual correlation pattern recognition (DCPR) method that was based on the correlation pattern recognition technique has been developed for classification of neutron/gamma events from a scintillation detector.
11/29/2019 3:06:55 AM +00:00
Estimation of effective radiation dose for households living in rare earth mines in Nam Xe, Lai Chau province
The paper presents the results of assessment of natural effective radiation doses on the basis of the projected outpatient dosimetry in 70 households living in Mau and Mo village of Nam Xe, Phong Tho distrist, Lai Chau province.
11/29/2019 3:06:45 AM +00:00
Studying digestion conditions of Vietnamese monazite with acid sulfuric for the recovery of rare earth elements, thorium and uranium
The monazite ore is a commercial source of Th, U and rare earth in Vietnam. There are two methods, which were often applied to decompose monazite ore are alkaline and sulfuric methods. But in Vietnam, sulfuric method is more suitable due to the simple technology.
11/29/2019 3:06:35 AM +00:00
The design and fabricate a pulse shape discriminator apply signal processing method using EJ-301 detector
In this article, an algorithm for digital implementation of the chargecomparison method for n/γ discrimination based on Digital Signal Processing technique is described.
11/29/2019 3:06:25 AM +00:00
Application of reverse osmosis at NPP and verification of the process for primary coolant treatment in temelín nuclear power
Drained primary coolant from nuclear power plants containing boric acid is currently treated in the system of evaporators and by ion exchangers. Reverse osmosis as an alternative process to evaporator was investigated. Using reverse osmosis, the feed primary coolant is separated into two output streams: retentate and permeate.
11/29/2019 3:06:16 AM +00:00
Particle identification for Z = 25 – 28 exotic nuclei from seastar experimental data
The particle identification (PID) method based on TOF-Bρ-ΔE measurement at RIKEN are discussed, and its application for Z = 25 – 28 neutron-rich nuclei from SEASTAR (Shell Evolution And Search for Two-plus energy At RIBF) experimental data are presented.
11/29/2019 3:06:05 AM +00:00
Characterization of an 241Am-Be neutron irradiation facility at Institute for Nuclear Science and Technology
The paper shows the main results obtained in terms of neutron spectra at fixed distances from the source as well as their neutron fluence rate (total and direct) and ambient dose equivalent rate.
11/29/2019 3:05:55 AM +00:00
Study the influences of the radionuclide depth distributions on the FEPE for the measurements of the soil activity using in situ HPGe gamma spectrometry
In this work, the influences of the soil densities and the radionuclide depth distributions (RDD) on the Full Energy Peak Efficiency (FEPE) calculation of the in-situ gamma ray spectrometer using the In Situ Object Counting Systems (ISOCS) software were studied. The data of the RDDs at the sites were investigated by using laboratory HPGe gamma spectrometer.
11/29/2019 3:05:43 AM +00:00
Effect of oligochitosan supplementation on growth and innate immunity of striped catfish (Pangasianodon hypophthalmus) at pond culture
Oligochitosan (COS) was prepared by gamma Co-60 irradiation of chitosan/H2O2 solutions and mixed with cornstarch to form the powder with content of 100 000 mg COS/kg. The striped catfish (P. hypophthalmus) was fed with diets containing 100 mg COS/kg feed for 9 months at pond culture.
11/29/2019 3:05:33 AM +00:00
The international calibration procedure for B3 film dosimetry system to ensure the quality irradiated products by 10 MeV electron beam accelerators at VINAGAMMA
The results revealed that the relative deviation between the values of absorbed doses obtained with our dosimeter and the transfer standards dosimeter measured by HDRL was within the acceptable limitation (about ± 3.0 % in the target range of 2.0-10.0 kGy). And post-irradiation stability of B3 film dosimeters was still maintained after 180 days storage.
11/29/2019 3:05:23 AM +00:00
Preparation of chitosan-glucosamine derivatives (Maillard reaction products) by gamma Co-60 irradiation method and investigation of antibacterial activity
The mixture solutions of glucosamine and chitosan with different molecular weights (123.5; 40.7 and 6.1 kDa) were irradiated by Co-60 gamma ray at dose of 50 kGy to prepare chitosanglucosamine Maillard reaction products (MRPs). The formation of MRPs was determined by measuring UV absorbance (at 284) nm and browning (at 420 nm).
11/29/2019 3:05:13 AM +00:00
Separation of Th from leachate of monazite sulphation process using amine solvent extraction
The solvent extraction is one of the most common method for separating Th from solution. Primary amine has higher selectivity for the extraction of Th(IV) than U(VI) and RE(III) in sulfate media. N1923 (a primary aliphatic amine with amino nitrogen linked to a secondary carbon consisting of branched alkyl groups in C19–23 range) is commonly used to extractTh.
11/29/2019 3:05:03 AM +00:00