Nuclear Science and Technology最新文献_第4页

Using Factor Analysis To Find Source Atmospheric Pollution By Moss Technique 利用因子分析法，通过莫斯技术查找大气污染源

Nuclear Science and Technology Pub Date : 2024-02-20 DOI: 10.53747/nst.v12i4.352

Tien Doan, Thi Thu My Trinh, Hong Khiem Le, Marina V. Frontasyeva, An Son Nguyen, Manh Hung Trinh, Van Dung Do, Tan Thong Vo, Xuan Vinh Ha

引用次数: 0

Study of the compartmental modelling method on the basic non-reactive tank 基本非反应罐的分区建模方法研究

Nuclear Science and Technology Pub Date : 2023-11-24 DOI: 10.53747/nst.v12i2.342

Hieu Tran Trong, Huong Huynh Thi Thu, Son Le Van, Quang Nguyen Huu

引用次数: 0

Investigation of Vietnamese monazite concentrate decomposition by alkaline (KOH) baking method 用碱性（KOH）焙烧法调查越南独居石精矿的分解情况

Nuclear Science and Technology Pub Date : 2023-11-24 DOI: 10.53747/nst.v12i2.351

Thi Hoang Xuan, Men Nguyen Thi, Tuyen Hoang Thi, Tuyen Ngo Van, Nhuan Hoang

引用次数: 0

Towards the intermolecular force in charged AdS black hole 迈向带电 AdS 黑洞中的分子间力

Nuclear Science and Technology Pub Date : 2023-11-24 DOI: 10.53747/nst.v12i2.376

Van Quyet Hoang, Huu Phat Tran, Tuan Anh Nguyen

{"title":"Towards the intermolecular force in charged AdS black hole","authors":"Van Quyet Hoang, Huu Phat Tran, Tuan Anh Nguyen","doi":"10.53747/nst.v12i2.376","DOIUrl":"https://doi.org/10.53747/nst.v12i2.376","url":null,"abstract":"In this paper we attempt to find the intermolecular force of charged AdS black holes (BH). We first write the equation of state of BH in the form of the van der Waals (vdW) equation and show that this equation describes accurately the BH phase transition. Based on the Lennard- Jones (LJ) potential we establish the modified LJ force which is compatible with this vdW equation. Of particular interest, in the first time we find that this force can be always written as the sum of the topological force, created by the topological charge, and the electrostatic force, created by charged conducting micro-sphere with definite radius. Then the phase transition of BH is totally controlled by these forces. In the process of phase transition from small to large BHs the sum of these forces changes from repulsive to attractive forces and this behavior is supported by the scalar curvature of the thermodynamic geometry. Combining these properties, we arrive at the physical picture of the BH molecules: they behave like charged conducting micro-spheres which bear topological charge. It necessarily to remark that although our intermolecular force is better than the one obtained recently in [29], it remains an approximate force.","PeriodicalId":19445,"journal":{"name":"Nuclear Science and Technology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-11-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139241412","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

Calculation, design and manufacture of system box-type mixer-settler used in rare earth solvent extraction process at laboratory scale 计算、设计和制造实验室规模稀土溶剂萃取工艺中使用的系统箱式混合器-沉降器

Nuclear Science and Technology Pub Date : 2023-11-24 DOI: 10.53747/nst.v12i2.346

Tùng Nguyễn Văn, Dinh Viet Nguyen, Quang Huy Ngo, Thi Lien Nguyen, Cong Trinh Bui, Xuan Dinh Luu

引用次数: 0

Improved Genetic algorithm for fuel loading optimization of the DNRR with HEU fuel 改进遗传算法，优化使用高浓缩铀燃料的 DNRR 的燃料装载量

Nuclear Science and Technology Pub Date : 2023-11-24 DOI: 10.53747/nst.v12i2.337

Giang T. T. Phan, Hoai Nam Tran, Q. Do

引用次数: 0

Phase Transition in Conjugate Planes of Charged AdS Black Hole 带电 AdS 黑洞共轭平面的相变

Nuclear Science and Technology Pub Date : 2023-11-24 DOI: 10.53747/nst.v12i2.382

Van Quyet Hoang, Tuan Anh Nguyen, Huu Phat Tran

引用次数: 0

Evaluating coincidence summing factor using marinelli beaker on coaxial HPGe detector by Monte Carlo simulation and calculating 用蒙特卡罗模拟和计算方法评价同轴高压锗探测器上marinelli烧杯的符合求和因子

Nuclear Science and Technology Pub Date : 2023-01-13 DOI: 10.53747/nst.v12i1.336

Hoang Minh Le, Quang Vuong Le, T. Tran, Van-Tao Chau

引用次数: 0

Assessing the radiological risks associated with primarily natural radioactivities of coastal seawater in northen Vietnam using the Erica software 使用Erica软件评估越南北部沿海海水主要与自然放射性有关的辐射风险

Nuclear Science and Technology Pub Date : 2023-01-13 DOI: 10.53747/nst.v12i1.340

Thi-Mong-Tham Vo, Trong-Ngo Nguyen, Q. Tran, X. T. Le, Minh-Đao Nguyen, Quang-Trung Phan, Thi Huong Lan Nguyen, Ngoc Thien Bui

{"title":"Assessing the radiological risks associated with primarily natural radioactivities of coastal seawater in northen Vietnam using the Erica software","authors":"Thi-Mong-Tham Vo, Trong-Ngo Nguyen, Q. Tran, X. T. Le, Minh-Đao Nguyen, Quang-Trung Phan, Thi Huong Lan Nguyen, Ngoc Thien Bui","doi":"10.53747/nst.v12i1.340","DOIUrl":"https://doi.org/10.53747/nst.v12i1.340","url":null,"abstract":"The activity concentrations of naturally occurring radionuclides 226Ra, 232Th, and 238U were determined in marine sediments, seawaters and seafood along the Gulf of Vietnam to establish baseline data for future environmental monitoring at a surface water depth of 0–3 cm. The concentration of uranium, thorium and radium were determined using a low background gamma spectrum as well as activity ofy of 238U(214Bi), 232Th(228Ac) and 226Ra. The mean radioactivity concentrations of 226Ra, 232Th, and 238U were found to be 8.59 ± 0.54, 1.31 ± 0.15, and 6.91 ± 0.64 Bq m−3, respectively, in seawater samples and 32.96 ± 1.90, 37.64 ± 1.91, and 39.28 ± 1.96 Bq kg−1, respectively, in marine sediments, 0.21 ± 0.03, 0.69 ± 0.11, and 0.19 ± 0.03 Bq kg−1, respectively, in fish samples and 0.23 ± 0.041, 0.41 ± 0.06, and 0.31 ± 0.06 Bq kg−1, respectively, in clam samples. The radioactivity concentrations in seawater are higher than those in sediment and compared with those reported in other countries. The mean values of distribution coefficient (L/kg) is 0.53, 0.13, and 0.23, respectively, in fish samples and 0.19, 0.16 and 0.13, respectively, in clam samples at Hai Phong, Quang Ninh and Ha Tinh. Moreover, the ecological dose at Hai Phong, Quang Ninh and Ha Tinh are 0.03, 0.02 and 0.02 µGy h−1, respectively, in fish and 0.02, 0.03, and 0.03 µGy h−1, respectively, in clams and the mean human’s seafood consumers dose rate is 1.13×10-6 Sv/yrs. Results were discussed and compared with those reported in similar studies and with internationally recommended values within limits recommended by UNSCEAR.","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":"83024632","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

Performance Comparison of ANN-Based Model and Empirical Correlations for Void Fraction Prediction of Subcooled Boiling Flow in Vertical Upward Channel 基于人工神经网络的竖直向上通道过冷沸腾流孔隙率预测模型与经验关联的性能比较

Nuclear Science and Technology Pub Date : 2023-01-13 DOI: 10.53747/nst.v11i4.335

Ngoc Dat Nguyen, Van Thai Nguyen

{"title":"Performance Comparison of ANN-Based Model and Empirical Correlations for Void Fraction Prediction of Subcooled Boiling Flow in Vertical Upward Channel","authors":"Ngoc Dat Nguyen, Van Thai Nguyen","doi":"10.53747/nst.v11i4.335","DOIUrl":"https://doi.org/10.53747/nst.v11i4.335","url":null,"abstract":"The accurate prediction of void fraction parameter in subcooled boiling flow is very important for nuclear safety since it has significant influences on the mass flow rate, the onset of two-phase flow instability, and the heat transfer characteristics in a nuclear reactor core. Many different models and empirical correlations have been established over a variety of input conditions; however, this classical approach could lead to unsatisfactory prediction due to the uncertainties of model parameter and model forms. To cope with these limitations, Artificial Neural Network (ANN) is a powerful machine learning tool for modeling and solving non-linear and complicated physical problems. Therefore, this work is aim at developing an ANN-based model to predict the local void fraction of subcooled boiling flows. The comparison results of the performance between the ANN-based model and empirical correlations for the void fraction prediction of subcooled boiling in vertical upward channel showed the potential use of ANN-based model in the Computational Fluid Dynamics (CFD) codes to accurately simulate the subcooled boiling phenomena.","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":"91109000","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