检索结果-内蒙古大学图书馆

TRACY and SILENE Benchmark Phase II evaluation by trace code

PROGRESS IN NUCLEAR ENERGY 2015年 85卷 71-82页

作者： Liem, Peng Hong Naito, Yoshitaka Nippon Adv Information Serv NAIS Co Inc Tokai Ibaraki 3191112 Japan

Following the Benchmark Phase I on the criticality excursion organized by the OECD NEA Working Party on the Nuclear Criticality Safety (Expert Group on Criticality Excursion), the Phase II of the benchmark was launched by selecting three experiments (R159, R76, R61) conducted at Japanese TRACY facility and one (LE1-641) from French SILENE facility. The main features of the Phase II of the benchmark are the ramp reactivity insertion generated by pumping fuel solution into the core tank (TRACY) or slow withdrawal of central transient rod (SILENE), and the use of both low enriched uranium (10 w/o, TRACY) and high enriched uranium (93 w/o, SILENE) for the uranyl nitrate fuel solution. As in the Phase I, trace code was used for the Phase II and the benchmark evaluated results were presented and discussed. The kinetic parameters, reactivity temperature and void coefficients for the benchmark were prepared using SRAC code system (PIJ, ANISN, CITATION and TWOTRAN modules) with JENDL-3.3 library. In general, the code benchmark results for the TRACY cases show excellent agreement with the measured data. However, for the SILENE case, overestimation of the power profile was observed. (C) 2015 Elsevier Ltd. All rights reserved.

关键词： Criticality excursion TRACY SILENE trace code LEO and HEU uranyl nitrate solution

来源：评论

学校读者我要写书评

暂无评论

Thermal performance analysis of reflux condensation in vertical tubes via pure steam

引用

EXPERIMENTAL AND COMPUTATIONAL MULTIPHASE FLOW 2025年第1期7卷 121-132页

作者： Albdour, Samah A. Osman, Sameer Hassan, Mubashir Yoon, Ho Joon Afgan, Imran Addad, Yacine Khalifa Univ Dept Mech & Nucl Engn Abu Dhabi U Arab Emirates Khalifa Univ Sci & Technol Emirates Nucl Technol Ctr Abu Dhabi 127788 U Arab Emirates Fed Author Nucl Regulat Abu Dhabi 112021 U Arab Emirates Univ Manchester Sch Engn Dept Mech & Aerosp Engn Manchester M13 9PL England

Reflux condensation in the U-tubes of a steam generator (SG) plays a vital role in removing heat in pressurized water reactors (PWRs) during mid-loop operations and/or accidents. To evaluate the efficacy of reflux condensation in SG U-tubes, a comprehensive understanding of the heat transfer characteristics associated with pure steam is necessary. Therefore, this study performs experiments to examine the reflux condensation of pure steam within a vertical tube with an inner diameter of 19 mm and an outer diameter of 22 mm. The steam bulk temperatures were systematically altered at 10-degree intervals within the range of 120-150 degrees C, and the steam Reynolds number ranged from 4876 to 20,430. Throughout, the temperature of the coolant within the cooling jacket and its rate of flow remained constant at 55 degrees C and 8 L/min, respectively. Validation via the trace system code confirmed good agreement with the experimental results, further bolstering confidence in the consistency of the current findings with the data previously used to calibrate and refine the correlations within the system code.

关键词： condensation reflux condensation steam generator (SG) trace code vertical tube

来源：评论

学校读者我要写书评

暂无评论

On trace codes and Galois invariance over finite commutative chain rings

引用

FINITE FIELDS AND THEIR APPLICATIONS 2013年 22卷 114-121页

作者： Martinez-Moro, E. Nicolas, A. P. Rua, I. F. Univ Valladolid Inst Math Soria 42004 Castilla Spain Univ Valladolid Dept Appl Math Soria 42004 Castilla Spain Univ Oviedo Dept Math Oviedo 33007 Asturias Spain

codes over finite commutative chain rings have been introduced as a generalization of codes over finite fields. Let S vertical bar R be a Galois extension of finite commutative chain rings. If C subset of S-n is an S-code, it is possible to define, starting from C, two different R-codes: Res(C) = C boolean AND R-n and Tr(C), where Tr is the trace function. In this work we analyze the relationships between these R-codes and the duality operator. (C) 2013 Elsevier Inc. All rights reserved.

关键词： Galois invariance trace code Finite chain ring

来源：评论

学校读者我要写书评

暂无评论

GENERALIZED HAMMING WEIGHTS OF trace codeS

引用

IEEE TRANSACTIONS ON INFORMATION THEORY 1994年第2期40卷 554-558页

作者： STICHTENOTH, H VOSS, C Mathematik und Informatik Universitat-GH-Essen Germany Universitat Duisburg-Essen Duisburg Nordrhein-Westfalen DE Dept. of Math. & Inf. Essen Univ. Germany

Linear codes over F(p) often admit a natural representation as trace codes of codes that are defined over an extension field F(p)m. In this paper, we obtain estimates for the weights of subcodes of such trace codes. Our main result is a far-reaching generalization of the Carlitz-Uchiyama bound for the duals of binary BCH codes. In particular, we prove sharp bounds for the generalized Hamming weights of a large class of codes, including duals of BCH codes, classical Goppa codes, Melas codes, and arbitrary cyclic codes of length n = p(m)-1. Our main tool is the theory of algebraic functions over finite fields, in particular the Hasse-Weil bound for the number of places of degree one.

关键词： trace code BCH code GOPPA code GENERALIZED HAMMING WEIGHT ALGEBRAIC FUNCTION FIELD ALGEBRAIC CURVE CRYPTOGRAPHY

来源：评论

学校读者我要写书评

暂无评论

The trace codes of several classes of linear codes

引用

DISCRETE MATHEMATICS 2024年第1期347卷

作者： Wu, Tingting Zhu, Shixin Liu, Li Xie, Xianhong HeFei Univ Technol Sch Math Hefei 230009 Peoples R China Intelligent Interconnected Syst Lab Anhui Prov Hefei Peoples R China Anhui Agr Univ Sch Informat & Comp Hefei 230036 Peoples R China

Recently, the research of trace codes over finite fields has received a lot of attention because some of these codes have good parameters. In this paper, we construct several classes of trace codes from some special classes of linear codes and give their weight distributions, showing that they contain some optimal and almost optimal codes. Furthermore, we determine the parameters of the duals of the trace codes, and show that they are distanceoptimal or nearly distance-optimal with respect to the sphere-packing bound. (c) 2023 Elsevier B.V. All rights reserved.

关键词： Linear code trace code Weight distribution Sphere-packing bound

来源：评论

学校读者我要写书评

暂无评论

Hyper-Kloosterman sums and their applications to the coding theory

引用

APPLICABLE ALGEBRA IN ENGINEERING COMMUNICATION AND COMPUTING 2001年第5期12卷 381-390页

作者： Chinen, K Hiramatsu, T Osaka Inst Technol Fac Engn Dept Math Asahi Ku Osaka 5358585 Japan Hosei Univ Coll Engn Div Math Sci Koganei Tokyo 1848584 Japan

The dual code of the Melas code is called the Kloosterman code. The weights of its codewords can be expressed by the Kloosterman sums, and are uniformly distributed with respect to the Sato-Tate measure. In this paper, the hyper-Kloosterman code C-m(q), a generalization of the Kloosterman code is defined, and the uniform distribution property is deduced using the hyper-Kloosterman sums when m is even and p - 1 \m. Finally we discuss doubly-evenness for the weights in the binary case. It shows that we can construct infinitely many doubly-even codes in a non-trivial way.

关键词： hyper-Kloosterman sums trace code weight distribution of codes

来源：评论

学校读者我要写书评

暂无评论

Surfaces and the weight distribution of a family of codes

引用

IEEE TRANSACTIONS ON INFORMATION THEORY 1997年第4期43卷 1354-1360页

作者： vanderVlugt, M Department of Mathematics and Computer Science University of Leiden Leiden Netherlands

We derive the weight distribution of the binary trace codes with words (Tr(ax(q+1) + bx(3) + cx)(x is an element of Fq2+) where a, b, c is an element of F-q2 and Tr is the trace map from F-q2 to F-2. The weights of these words determine the exponential sums which were considered earlier by Moreno, Kumar, and Lahtonen. Results from the theory of quadratic forms play a role but the decisive argument is of an algebraic-geometric nature, namely, from the theory of surfaces.

关键词： exponential sum quadratic form surface trace code weight distribution

来源：评论

学校读者我要写书评

暂无评论

Analysis of cold leg LOCA with failed HPSI by means of integrated safety assessment methodology

引用

ANNALS OF NUCLEAR ENERGY 2014年第Jul.期69卷 144-167页

作者： Gonzalez-Cadelo, J. Queral, C. Montero-Mayorga, J. Tech Univ Madrid Univ Politecn Madrid Madrid 28003 Spain

The integrated safety assessment (ISA) methodology, developed by the Spanish Nuclear Safety Council (CSN), has been applied to a thermal-hydraulic analysis of cold leg LOCA sequences with unavailable High Pressure Injection System in a Westinghouse 3-loop PWR. This analysis has been performed with trace 5.0 patch 1 code. ISA methodology allows obtaining the Damage Domain (the region of space of parameters where a safety limit is exceeded) as a function of uncertain parameters (break area) and operator actuation times, and provides to the analyst useful information about the impact of these uncertain parameters in safety concerns. In this work two main issues have been analyzed: the effect of reactor coolant pump trip and the available time for beginning of secondary-side depressurization. The main conclusions are that present Emergency Operating Procedures (EOPs) are adequate for managing this kind of sequences and the ISA methodology is able to take into account time delays and parameter uncertainties. (C) 2014 Elsevier Ltd. All rights reserved.

关键词： Accident management Emergency operating procedures Integrated safety assessment Probabilistic safety assessment Small-break LOCA trace code

来源：评论

学校读者我要写书评

暂无评论

An investigation of steam-water countercurrent flow model in trace

引用

ANNALS OF NUCLEAR ENERGY 2010年第10期37卷 1378-1383页

作者： Cheng, Yi-Hsiang Shih, Chunkuan Wang, Jong-Rong Lin, Hao-Tzu Natl Tsing Hua Univ Dept Engn & Syst Sci Hsinchu 30013 Taiwan Natl Tsing Hua Univ Inst Nucl Engn & Sci Hsinchu 30013 Taiwan Inst Nucl Energy Res Tao Yuan 32546 Taiwan

This paper studies the countercurrent flow model in the trace code version 5.0. Steam and water are chosen as the working fluids that flow counter-currently in a circular pipe. Three types of countercurrent flow models, including the Wallis, Kutateladze and Bankoff correlations, are investigated. A single tube model was built to study the Wallis and the Kutateladze correlations, and the variable in the calculation model is the pipe diameter. A perforated plate model was constructed to study the Bankoff correlation, and the variables include the pipe and hole diameters, the number of holes and the plate thickness. The hydraulic diameter of the pipe varied from 2.5 to 200 mm for the tests on the Wallis and Kutateladze correlations. To validate the Bankoff correlation, the hydraulic diameter of the pipe was varied from 50 to 200 mm, and the plate thickness varied from 10 to 40 mm. In this study we validate the countercurrent flow model in the trace code, and comment on the application ranges of the three correlations. (C) 2010 Elsevier Ltd. All rights reserved.

关键词： Countercurrent flow code analysis and validation trace code

来源：评论

学校读者我要写书评

暂无评论

Artin-Schreier curves and weights of two-dimensional cyclic codes

引用

FINITE FIELDS AND THEIR APPLICATIONS 2004年第4期10卷 481-505页

作者： Güneri, C Sabanci Univ Fac Engn & Nat Sci TR-34956 Istanbul Turkey

Let F-q be the finite field with q elements of characteristic p, F-qm be the extension of degree m > 1 and f (x) be a polynomial over F-qm. The maximum number of affine F-qm-rational points that a curve of the form y(q) - y = f(x) can have is q(m+1). We determine a necessary and sufficient condition for such a curve to achieve this maximum number. Then we study the weights of two-dimensional (2-D) cyclic codes. For this, we give a trace representation of the codes starting with the zeros of the dual 2-D cyclic code. This leads to a relation between the weights of codewords and a family of Artin-Schreier curves. We give a lower bound on the minimum distance for a large class of 2-D cyclic codes. Then we look at some special classes that are not covered by our main result and obtain similar minimum distance bounds. (C) 2003 Elsevier Inc. All rights reserved.

关键词： Artin-Schreier curve 2-D cyclic code trace code

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：