Nuclear Science and Technology最新文献_第5页

Design of a FPGA-based digital reactivity meter for Dalat Nuclear Research Reactor 基于fpga的大叻核研究堆数字反应度计设计

Nuclear Science and Technology Pub Date : 2023-01-13 DOI: 10.53747/nst.v11i4.350

V. Vo, V. Nguyen, Nhi-Dien Nguyen, Van Hiep Le

引用次数: 0

Effects of carrageenan oligosaccharides prepared by electron beam irradiation on frozen shrimps during storage 电子束辐照制备的卡拉胶寡糖对冷冻虾贮藏的影响

Nuclear Science and Technology Pub Date : 2023-01-13 DOI: 10.53747/nst.v11i4.331

T. Pham, T. Nguyen, Nhut Khanh Chu, V. Cao, Binh Doan, Ngoc Thao Nguyen Nguyen, T. Nguyen

{"title":"Effects of carrageenan oligosaccharides prepared by electron beam irradiation on frozen shrimps during storage","authors":"T. Pham, T. Nguyen, Nhut Khanh Chu, V. Cao, Binh Doan, Ngoc Thao Nguyen Nguyen, T. Nguyen","doi":"10.53747/nst.v11i4.331","DOIUrl":"https://doi.org/10.53747/nst.v11i4.331","url":null,"abstract":"1% carrageenan oligosaccharide solutions obtained by electron beam irradiation at the radiation doses of 9 kGy (CO-9) and 30 kGy (CO-30) were applied for shrimps before frozen, and their effects on quality of frozen shrimps were investigated by observing the microstructure of shrimp’s muscle tissue, measuring their weight loss (%), hardness and pH after thawing. Comparison with the shrimps treated by 1% tetrasodium pyrophosphate solution (Na4P2O7, positive control) and distilled water (negative control), the shrimp samples soaked in CO before frozen kept their initial properties, and the shrimps treated by CO-30 solution showed better quality than others after 3 weeks of frozen storage. Specifically, the mean distances of muscle bundles and muscle fibers in the shrimps soaked in CO-30 solution were 23.9 µm and 11.1 µm, respectively, much smaller than 37.9 µm and 14.8 µm in the shrimps treated by Na4P2O7, and 46.7 µm and 19.8 µm in the shrimps soaked in distilled water only. Our results also revealed that the weight loss after thawing and pH of the shrimps soaked in CO-30 solution were 1.55% and 6.40, much lower than that of the positive control sample (2.59% and 6.82) and negative control sample (4.83% and 6.58), respectively. In contrast, the mean of hardness of the sample soaked in CO-30 solution was 20.4, about 20.7 and 36.0% higher than those of positive control (16.9) and negative control (15.0). These results suggested that CO-30 is effective to inhibit the denaturation of shrimp during frozen storage and can be applied to prolong the shelf life and keep the quality of frozen shrimp products.","PeriodicalId":19445,"journal":{"name":"Nuclear Science and Technology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-01-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91454646","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Application of nuclear analytical spectroscopies and ion beams to the study of nanomaterials: cooperative projects between Vinatom and JINR (Dubna) 核分析光谱和离子束在纳米材料研究中的应用:越南原子能公司与杜布纳JINR合作项目

Nuclear Science and Technology Pub Date : 2023-01-13 DOI: 10.53747/nst.v12i1.349

Tuyen Luu Anh, Hung Nguyen, N. Tiep, D. Phuc, P. Phuc, L. Thai, T. Xuan, P. Huế, N. Hue, L. Nguyen, N. Trung

{"title":"Application of nuclear analytical spectroscopies and ion beams to the study of nanomaterials: cooperative projects between Vinatom and JINR (Dubna)","authors":"Tuyen Luu Anh, Hung Nguyen, N. Tiep, D. Phuc, P. Phuc, L. Thai, T. Xuan, P. Huế, N. Hue, L. Nguyen, N. Trung","doi":"10.53747/nst.v12i1.349","DOIUrl":"https://doi.org/10.53747/nst.v12i1.349","url":null,"abstract":"Due to the rapid scientific and technological development in the last decades, basic research in solid state physics, chemistry and material science has focused on objects and phenomena more and more confined in dimensions and time-scale, and well visible for the general publicity by introducing the terms “nanophysics, nanoscience, nanomaterials, etc.”, often featured in the media. Researchers therefore keep searching for better and better investigative techniques. Various nuclear analytical spectroscopies, such as Positron annihilation lifetime (PAL), Doppler broadening of positron annihilation energy (DB), Electron momentum distribution (EMD), Slow positron beam (SPB), Neutron diffractions (ND), Rutherford backscattering (RBS), etc., have proved themselves as useful tools for microscopic analysis of different material’s structure ranging from angstrom (Ȧ) to nanometer (nm) scales. Besides, ion beams generated from accelerators (electron, 1H, 2He, 40Ar, 86Kr, 109Ag, 123Xe, 184W, etc.) have also become very effective tools for modifying the micro structure of nanomaterials. These methods have been intensively utilized by our group at Vinatom with external collaborations from JINR (Dubna) in order to study the in-depth structure of different nanomaterials. This report introduces our research and collaborative activities, facilities and some recent highlighted results.","PeriodicalId":19445,"journal":{"name":"Nuclear Science and Technology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-01-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90564596","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Establishment and quality assessment of X-ray narrow spectrum series according to ISO 4037:2019 at SSDL of center for nuclear technologies 根据ISO 4037:2019在核技术中心SSDL建立和质量评估x射线窄谱系列

Nuclear Science and Technology Pub Date : 2023-01-13 DOI: 10.53747/nst.v12i1.374

Huu Loi Le, Hoang Long Nguyen, Quang Son Ong, M. Ho, Van Hoang Dao, Truong Son Truong, Van Tien Vo, Quang Vuong Le

{"title":"Establishment and quality assessment of X-ray narrow spectrum series according to ISO 4037:2019 at SSDL of center for nuclear technologies","authors":"Huu Loi Le, Hoang Long Nguyen, Quang Son Ong, M. Ho, Van Hoang Dao, Truong Son Truong, Van Tien Vo, Quang Vuong Le","doi":"10.53747/nst.v12i1.374","DOIUrl":"https://doi.org/10.53747/nst.v12i1.374","url":null,"abstract":"Narrow spectrum series from N-40 to N-120 were established according to ISO 4037:2019. This study was made through experimental measurements and the software modeling toolkit SpekPy v2.0. Experiments were performed to determine Inherent filtration (0.332 & 0.492 mm Al at 100 cm & 250 cm, respectively). The maximum deviation compared to ISO 4037:2019 of the measured HVLs values are not more then 0.10 mm Al and for modeling not exceed 0.09 mm Al; h range 0.91 to 0.97 for experimently and 0.89 to 0.96 for modeling (0.88 - 1, ISO 4037-1:2019). The maximum contribution of scattering is value 4.0% (< 5%, ISO 4037-1:2019). Radiation field uniformity of N-40 to N-120 should list all categories in detail 12.5, 11.0, 10.0, 9.0, 8.5 cm at 100 cm distance; and 35.5, 31.5, 29.0, 26.5, 24.5 cm at 250 cm beam center axis distance. On the basis of ISO 4037:2019, air kerma values at 100 cm and 250 cm have also been determined with uncertainties 3.85% to 5.18% for experimently and 3.41% to 4.19% for modeling (not exceed 10%, ISO 4037:2019). Therefore, the X-ray radiation field has been well established in compliance with the ISO 4037:2019, it can be used for calibrating survey meters and personal dosimeters.","PeriodicalId":19445,"journal":{"name":"Nuclear Science and Technology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-01-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86427798","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Theoretical consideration of isomeric ratios in some photonuclear reactions induced by bremsstrahlung with endpoint energy in giant dipole resonance region using Talys 1.95 code 利用Talys 1.95代码对偶极子共振区末端能量弱致辐照引起的一些光子核反应中异构体比率的理论考虑

Nuclear Science and Technology Pub Date : 2023-01-13 DOI: 10.53747/nst.v12i1.373

Minh Hue Bui, D. T. Tran

引用次数: 0

Using ARGOS to simulate radioactive dispersion in the atmosphere from Fangchenggang nuclear power plant to Viet Nam 利用ARGOS模拟防城港核电站至越南的放射性物质在大气中的扩散

Nuclear Science and Technology Pub Date : 2023-01-13 DOI: 10.53747/nst.v11i4.329

D. Duong, Tuan Nam Pham, Dac Dung Bui, Thi Oanh Nguyen, T. H. Doan, Van Khanh Nguyen, Huyen-Trang Nguyen, Hoang Giang Nguyen

引用次数: 0

Use of 210Pb dating models for estimating sedimentation rate of a typical sediment core taken in the Ba Lat coastal area (Red River) 利用210Pb定年模型估算巴拉特沿岸典型沉积物岩心沉积速率(红河)

Nuclear Science and Technology Pub Date : 2023-01-13 DOI: 10.53747/nst.v12i1.348

Dac Dung Bui, D. Duong, V. Duong, Thu Bac Vuong, Thi Ha Thanh Nguyen, T. H. Doan, Thi Oanh Nguyen, Dinh Cuong Le, Hoang Giang Nguyen, Huyen-Trang Nguyen

{"title":"Use of 210Pb dating models for estimating sedimentation rate of a typical sediment core taken in the Ba Lat coastal area (Red River)","authors":"Dac Dung Bui, D. Duong, V. Duong, Thu Bac Vuong, Thi Ha Thanh Nguyen, T. H. Doan, Thi Oanh Nguyen, Dinh Cuong Le, Hoang Giang Nguyen, Huyen-Trang Nguyen","doi":"10.53747/nst.v12i1.348","DOIUrl":"https://doi.org/10.53747/nst.v12i1.348","url":null,"abstract":"Sediment cores were taken in the coastal area of Ba Lat estuary (Red River), in the Xuan Thuy national park. Each core was cut into slices of 4 cm in thickness, numbered from top to bottom and then analyzing for radionuclides (226Ra, 137Cs and 210Pb). Computational dating models were used to determine the age and sedimentation rate for each sediment core. This report presents the results of applying computational models to the sediment core BL13 that could provide a general methodology for determining the age and the sedimentation rate of the sediment cores taken in the coastal area of Ba Lat estuary. Results show that Constant rate of supply (CRS) model is probably the best model for determining the sedimentation rate. For the sediment core BL13, the use of the Composite model by adjusting the results of the CRS model in combination with the time marker of August 1971 (the time of the historical flood event on the Red River) seems to give the most reasonable results. The average sedimentation rate at the BL13 site before 1960 was about 0.5 cm/year. The rate had increased significantly from 1960, up to the highest value of 1.5 cm year-1 in the 1970s and then decreased to about 1.0 to 1.2 cm/year from the 1980s to the present. The change in the sedimentation rate could be caused by the main flow changes and large floods of the Red River from 1960 to 1980.","PeriodicalId":19445,"journal":{"name":"Nuclear Science and Technology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-01-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88995492","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Identification of Cold-Leg Break Size in LOCA Accident using Artificial Neural Networks and Simulation Database 基于人工神经网络和仿真数据库的LOCA事故冷腿断裂尺寸识别

Nuclear Science and Technology Pub Date : 2023-01-13 DOI: 10.53747/nst.v11i4.339

Thi Hong Ngoc Le, Ngoc Dat Nguyen, Van Thai Nguyen

{"title":"Identification of Cold-Leg Break Size in LOCA Accident using Artificial Neural Networks and Simulation Database","authors":"Thi Hong Ngoc Le, Ngoc Dat Nguyen, Van Thai Nguyen","doi":"10.53747/nst.v11i4.339","DOIUrl":"https://doi.org/10.53747/nst.v11i4.339","url":null,"abstract":"The most widely studied LOCA (Loss of Coolant Accidents) is a rupture of a cold leg pipe causing the Reactor Cooling System to depressurize first, with different break sizes corresponding to the change in trigger signal from the Instrument and Control System (I&C System) such as pressure, temperature, power, pressure vessel water level, etc. is different. Therefore, the response of nuclear power plant varies considerably with the size of break. To mitigate the consequence of LOCA with a given break size, it is necessary to design the emergency core coolant systems so that the fuel is cooled efficiently during all phases of the accident. Therefore, the size of rupture needs to be detected and identified as soon as possible right after reactor scram. To achieve this goal, this study is conducted to investigate the applicability of artificial neural networks (ANN) for recognizing LOCAs, especially identifying the rupture sizes of the LOCAs according to the changes of operational parameters of VVER-1000 nuclear power plant. This study mainly focuses on building, training, and optimizing the artificial neural networks using simulation databases obtained from the RELAP5 simulation program for VVER-1000 reactor technology. Results clearly showed the potential application of ANN-based model for detecting the break size even with uncertainty of input parameters added.","PeriodicalId":19445,"journal":{"name":"Nuclear Science and Technology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-01-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82795435","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Feasibility Study and Analysis of Intelligent Technology Application in Nuclear Power Industry 智能技术在核电行业应用的可行性研究与分析

Nuclear Science and Technology Pub Date : 2023-01-01 DOI: 10.12677/nst.2023.113029

娟王

引用次数: 0

Applied Research on Quality Function Deployment in PWR Fuel Rod Design and Manufacturing 质量功能展开在压水堆燃料棒设计与制造中的应用研究

Nuclear Science and Technology Pub Date : 2023-01-01 DOI: 10.12677/nst.2023.113033

鹏鹤张

引用次数: 0