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Benchmarking of neutron production of heavy-ion transport codes 重离子输运码中子产生的基准测试
Pub Date : 2012-04-01 DOI: 10.1520/JAI104227
I. Remec, R. Ronningen, L. Heilbronn
Accurate prediction of radiation fields generated by heavy ion interactions is important in medical applications, space missions, and in design and operation of rare isotope research facilities. In recent years, several well-established computer codes in widespread use for particle and radiation transport calculations have been equipped with the capability to simulate heavy ion transport and interactions. To assess and validate these capabilities, we performed simulations of a series of benchmark-quality heavy ion experiments with the computer codes FLUKA, MARS15, MCNPX, and PHITS. We focus on the comparisons of secondary neutron production. Results are encouraging; however, further improvements in models and codes and additional benchmarking are required.
对重离子相互作用产生的辐射场的准确预测在医疗应用、空间任务以及稀有同位素研究设施的设计和运行中具有重要意义。近年来,在粒子和辐射输运计算中广泛使用的几个完善的计算机代码已经具备了模拟重离子输运和相互作用的能力。为了评估和验证这些功能,我们使用计算机代码FLUKA、MARS15、MCNPX和PHITS对一系列基准质量的重离子实验进行了模拟。我们着重于二次中子产生的比较。结果令人鼓舞;然而,模型和代码的进一步改进以及额外的基准测试是必需的。
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引用次数: 5
Development of INSPCT-S for Inspection of Spent Fuel Pool 用于乏燃料池检查的inspect - s的研制
Pub Date : 2012-04-01 DOI: 10.1520/JAI104070
W. Walters, A. Haghighat, S. Sitaraman, Y. Ham
In this paper, we discuss an accurate and fast software tool (INSPCT-S, Inspection of Nuclear Spent fuel-Pool Calculation Tool, version Spreadsheet) developed for calculation of the response of fission chambers placed in a spent fuel pool, such as Atucha-I. INSPCT-S is developed for identification of suspicious regions of the pool that may have missing or substitute assemblies. INSPCT-S uses a hybrid algorithm based on the adjoint function methodology. The neutron source is comprised of spontaneous fission, ({alpha}, n) interactions, and subcritical multiplication. The former is evaluated using the ORIGEN-ARP code, and the latter is obtained with the fission matrix (FM) formulation. The FM coefficients are determined using the MCNP Monte Carlo code, and the importance function is determined using the PENTRAN 3-D parallel Sn code. Three databases for the neutron source, FM elements, and adjoint flux are prepared as functions of different parameters including burnup, cooling time, enrichment, and pool lattice size. INSPCT-S uses the aforementioned databases and systems of equations to calculate detector responses, which are subsequently compared with normalized experimental data. If this comparison is not satisfied, INSPCT-S utilizes color coding to identify the suspicious regions of a spent fuel pool. (authors)
在本文中,我们讨论了一个精确和快速的软件工具(inspect - s, Inspection of Nuclear Spent fuel pool Calculation tool, version Spreadsheet),用于计算放置在乏燃料池中的裂变室的响应,如atucha - 1。开发inspect - s是为了识别池中可能有缺失或替代组件的可疑区域。insct - s采用了一种基于伴随函数方法的混合算法。中子源由自发裂变、({α}, n)相互作用和亚临界倍增组成。前者用ORIGEN-ARP代码计算,后者用裂变矩阵(FM)公式计算。利用MCNP蒙特卡罗码确定调频系数,利用PENTRAN三维并行Sn码确定重要函数。建立了中子源、调频元素和伴随通量随燃耗、冷却时间、富集和池格尺寸等参数变化的数据库。inspect - s使用上述数据库和方程组来计算探测器响应,然后将其与归一化的实验数据进行比较。如果这种比较不令人满意,则inspect - s使用颜色编码来识别乏燃料池的可疑区域。(作者)
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引用次数: 4
Potential of Dynamic-Mechanical Analysis Toward a Complementary Material and System Testing Approach for Structural Glazing 动态力学分析对结构玻璃补充材料和系统测试方法的潜力
Pub Date : 2012-04-01 DOI: 10.1520/JAI104124
C. Recknagel
Dynamic-mechanical material analysis as a basis for a general performance exploration complemented by system testing under superimposed climatic and mechanical loading seems to be a promising interdependent test approach addressing the performance behavior of construction sealants under more realistic conditions. With this contribution an attempt is made to adapt dynamic-mechanical material analysis, which has been already successfully validated for different construction types of expansion joint systems in road and bridge engineering, to the field of construction sealants for building facades. Test results from dynamic-mechanical material analysis characterizing the temperature-dependent, deformation-dependent, and frequency-dependent behavior of structural sealant materials are presented and exemplarily discussed for three different sealant products. An attempt is made to address unknown material characteristics in the multi-dimensional loading matrix representing practical use conditions. Furthermore, the applicability of this test approach and its various complex test modes for the exploration of technological performance and especially estimation of fatigue behavior is verified in several examples. Based on this fundamental material exploration, it is planned to complement the dynamic-mechanical assessment methodology by means of system tests on a section of a structural glazing system subjected to a simplified but superimposed loading function. The technical fundamentals and the procedure proposed to develop an adequate system test mode are introduced. The motivation for these investigations is to identify the actual mechanical system behavior under load combinations and for specimens that both closer resemble reality. The objective is to achieve a consistent and interdependent test program complementary to the existing methodology. Finally, the study is meant to initiate further progress toward a performance-related methodology which considers the design, specification, material, and system selection.
动态力学材料分析作为一般性能探索的基础,辅以叠加气候和机械载荷下的系统测试,似乎是一种有前途的相互依赖的测试方法,可以解决建筑密封胶在更现实条件下的性能行为。有了这一贡献,我们尝试将动态力学材料分析应用于建筑立面建筑密封胶领域,该分析已经成功地验证了道路和桥梁工程中不同施工类型的伸缩缝系统。本文介绍了三种不同密封胶产品的动态力学材料分析结果,分析了结构密封胶材料的温度依赖性、变形依赖性和频率依赖性。试图解决代表实际使用条件的多维加载矩阵中未知材料特性的问题。并通过实例验证了该试验方法及其多种复杂试验模式在技术性能探索特别是疲劳性能评估中的适用性。基于这种基本的材料探索,计划通过对结构玻璃系统的一部分进行简化但叠加加载功能的系统测试来补充动态力学评估方法。介绍了开发适当的系统测试模式的技术基础和步骤。这些研究的动机是为了确定实际的机械系统在载荷组合下的行为,以及更接近现实的样品。目标是实现与现有方法相补充的一致且相互依赖的测试程序。最后,该研究旨在进一步推进与性能相关的方法,该方法考虑了设计、规格、材料和系统选择。
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引用次数: 4
Sensitivity of Adjustment to Parameter Correlations and to Response-Parameter Correlations 调整对参数相关性和响应-参数相关性的敏感性
Pub Date : 2012-04-01 DOI: 10.1520/JAI104044
J. Wagschal
The adjusted parameters and response, and their respective posterior uncertainties and correlations, are presented explicitly as functions of all relevant prior correlations for the two parameters, one response case. The dependence of these adjusted entities on the various prior correlations is analyzed and portrayed graphically for various valid correlation combinations on a simple criticality problem.
调整后的参数和响应,以及它们各自的后验不确定性和相关性,被明确地表示为两个参数(一个响应情况)的所有相关先验相关性的函数。在一个简单的临界问题上,分析了这些调整后的实体对各种先验相关的依赖关系,并用图形描述了各种有效的相关组合。
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引用次数: 0
Use of Cement-Treated Lightweight Soils Made from Dredged Clay 使用由疏浚粘土制成的经水泥处理的轻质土壤
Pub Date : 2012-04-01 DOI: 10.1520/JAI104219
Y. Watabe, T. Noguchi, Y. Mitarai
Recently, a new runway designated “D-runway” was constructed at Tokyo Haneda Airport. In this project, a large amount of cement treated lightweight soils made from very soft and mildly contaminated dredged clay was used. In this paper, a seawall structure using a cement treated lightweight soil made from dredged clay is introduced and the quality control of these soils in the construction work is discussed. Two types of lightweight soils, “pneumatic mixing cement treated soil” and “air-foam treated lightweight soil,” were used as backfill in the seawall structures. Design and quality control of the lightweight soils were carried out, and the seawall structures were successfully constructed. The shear strength and bulk density of the lightweight soils placed in the sites met the required specifications in design.
最近,东京羽田机场新建了一条名为“d跑道”的跑道。在这个项目中,使用了大量由非常柔软和轻度污染的疏浚粘土制成的水泥处理过的轻质土壤。本文介绍了一种采用疏浚粘土制成的水泥处理轻质土的海堤结构,并讨论了施工过程中轻质土的质量控制。采用“气动搅拌水泥处理土”和“空气泡沫处理轻土”两种轻土作为海堤结构的回填土。对轻质土进行了设计和质量控制,成功地完成了海堤结构的施工。场地放置的轻质土抗剪强度和容重均满足设计要求。
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引用次数: 13
Alpine Skiing, Telemarking, Snowboarding, and Skiboarding Injuries Related to Gender and Ability 高山滑雪,电话营销,单板滑雪和滑板伤害相关的性别和能力
Pub Date : 2012-04-01 DOI: 10.1520/JAI104496
A. Ekeland, A. Rødven
A central ski-patrol-based registration of skiing and boarding injuries was performed by the Norwegian Ski Lift Association during the winter seasons 2008/2009 and 2009/2010 as part of an ongoing study since 1996. Totals of 8547 injured skiers/boarders and 6.621 × 106 s of skier/boarder days were recorded during the two seasons, giving an injury rate of 1.29 injured per 1000 skier/boarder days. Most of the injuries occurred during alpine skiing (67 %) and snowboarding (29 %), compared to telemark skiing (2 %), and skiboarding (2 %). Wrist injuries were common among injured snowboarders (22 %) compared to 1–6 % for the others (P
自1996年以来,作为一项持续研究的一部分,挪威滑雪缆车协会在2008/2009和2009/2010冬季进行了一项以滑雪巡逻为基础的滑雪和登机伤害登记。两个赛季共记录了8547名受伤的滑雪者/滑板者和6.621 × 106 s的滑雪者/滑板者/滑板者日,受伤率为1.29人/ 1000滑雪者/滑板者日。大多数伤害发生在高山滑雪(67%)和单板滑雪(29%),而telemark滑雪(2%)和单板滑雪(2%)。腕部损伤在受伤的滑雪板运动员中很常见(22%),而其他运动员的腕部损伤发生率为1 - 6% (P
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引用次数: 10
New Work on Updating and Extending the Nuclear Data Standards 更新和扩展核数据标准的新工作
Pub Date : 2012-04-01 DOI: 10.1520/JAI104095
A. Carlson, V. Pronyaev, R. Capote, F. Hambsch, F. Käppeler, C. Lederer, W. Mannhart, A. Mengoni, R. Nelson, P. Schillebeeckx, P. Talou, S. Tagesen, H. Vonach, A. Vorobyev, A. Wallner
An International Atomic Energy Agency (IAEA) Data Development Project was initiated to provide a mechanism for allowing new experimental data and improvements in evaluation procedures to be incorporated into new evaluations of the standards. The work on this project is ongoing. In the past very long periods sometimes occurred between evaluations of the standards. Through the use of this Project, such long periods should not occur. Work on the cross section standards through this Project has included an update of the experimental data to be used in the cross section standards evaluations, a study of the uncertainties obtained in the international standards evaluation, and improvements in the smoothing procedure for capture cross sections. It was decided that this Project should have a broader range of activities than just the cross section standards and thus encompass standards related activities. The following are being investigated: improvements in the gold cross section at energies below where it is considered a standard and work on certain cross sections that are not as well known as the cross section standards but could be very useful as reference cross sections relative to which certain types of cross section measurements can be made. This work includes promptmore » gamma-ray production in fast neutron-induced reactions, and work on the {sup 252}Cf spontaneous fission neutron spectrum and the {sup 235}U thermal neutron fission spectrum. Most of the data investigated through this Project are used in dosimetry applications. (authors)« less
发起了一个国际原子能机构(原子能机构)数据发展项目,以提供一种机制,使新的实验数据和评价程序的改进能够纳入对标准的新的评价。这个项目的工作正在进行中。在过去,很长一段时间有时会发生在标准评估之间。通过使用本项目,不应出现如此长的时间。本项目的横截面标准工作包括更新横截面标准评估中使用的实验数据,研究国际标准评估中获得的不确定度,改进捕获横截面的平滑程序。决定这个项目应该有更广泛的活动范围,而不仅仅是横截面标准,因此包含了与标准相关的活动。以下是正在研究的:在能量低于黄金横截面的改进,它被认为是一个标准,并在某些横截面上工作,这些横截面不像横截面标准那样为人所知,但作为参考横截面可能非常有用,相对于某些类型的横截面测量可以进行。这项工作包括在快中子诱导反应中产生快速伽马射线,以及对{sup 252}Cf自发裂变中子谱和{sup 235}U热中子裂变谱的研究。通过该项目调查的大部分数据用于剂量学应用。(作者)«更少
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引用次数: 28
Structure Transformations in Multicomponent Amorphous Alloys in Connection with Grain-Boundary Segregations and Temper Embrittlement of Steels 与晶界偏析和钢回火脆化有关的多组分非晶合金组织转变
Pub Date : 2012-04-01 DOI: 10.1520/JAI104153
I. V. Lyasotsky, N. B. Dyakonova, D. L. Dyakonov
Investigation of glass-forming alloys on the base of Fe–P system with additions of C, Mn, Cr, Si, and Ni with compositions modeling segregations on grain boundaries in steels revealed the existence of a metastable phase that precipitates at the initial stages of devitrification. This crystalline tetrahedrally close-packed phase of α–Mn structure type (χ-phase) and its aperiodic modification (cubic quasicrystal) contain less phosphorus than the known stable and metastable phosphides. Positions of P and C atoms in the unit cell of the χ-phase lattice have been established. The necessary condition for precipitation of the quasicrystalline phase is the presence of carbon. Additions of Mn + Si, Mn, or Cr promote both formation of the χ-phase and formation of the quasicrystal, their influence decreasing in this order. Composition dependences of liability to formation of the quasicrystalline structures in the model alloys agree with the data on the impact of alloying elements on the temper embrittlement of steels.
在Fe-P体系的基础上,对添加C、Mn、Cr、Si和Ni的非晶合金进行了研究,发现在钢的晶界上存在模拟偏析的成分,在反晶化的初始阶段析出亚稳相。这种α-Mn结构型的四面体密排相(χ-相)及其非周期修饰(立方准晶)比已知的稳定和亚稳磷化物含磷量少。确定了P原子和C原子在χ相晶格的单元胞中的位置。准晶相析出的必要条件是碳的存在。Mn + Si、Mn或Cr的加入对χ-相的形成和准晶的形成都有促进作用,其影响依次递减。模型合金中准晶组织形成倾向的成分依赖性与合金元素对钢回火脆化影响的数据一致。
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引用次数: 3
Uncertainties of Responses Calculated with a “Tuned” Library: Geometrical and Algebraic Insights 响应的不确定性计算与“调谐”库:几何和代数的见解
Pub Date : 2012-04-01 DOI: 10.1520/JAI103992
R. L. Perel
The standard American evaluated nuclear data library ENDF/B-VII was “tuned” based on simple measured critical assemblies. This tuning was not done according to a fully defined mathematical algorithm, such as the adjustment algorithm. In this work, we investigate how tuning affects the uncertainties (covariances) of the cross-section libraries. First, we analyze what happens to cross-section uncertainties as a result of adjustment. The effect of adjustment on the uncertainties is geometrically demonstrated for simple cases. For those parts of the sensitivities of the assembly to be calculated that are parallel to the sensitivities of the assemblies on which adjustment was based, there is significant reduction in the uncertainties. For orthogonal parts, there is no change in the uncertainties. These findings are algebraically proven based on the adjustment algorithm. Then we analyze the differences between tuned libraries and adjusted libraries. We conclude that for tuned libraries, the uncertainties in the direction of sensitivities on which adjustment or tuning were based are improved, similar to the improvement for an adjusted library. However, the displacement of the nominal values of the library parameters to their tuned value, instead of their adjusted value, adds an additional uncertainty. This additional uncertainty is typically small in the direction that was improved by adjustment. The magnitude of the additional uncertainty in perpendicular directions depends on the particular details of the tuning performed.
标准的美国评估核数据库ENDF/B-VII是基于简单测量的临界组件进行“调整”的。这种调优不是根据完全定义的数学算法(如调整算法)完成的。在这项工作中,我们研究了调优如何影响截面库的不确定性(协方差)。首先,我们分析了调整后截面不确定性的变化。对于简单的例子,用几何方法证明了平差对不确定性的影响。对于要计算的组件灵敏度的那些部分,与调整所基于的组件的灵敏度平行,不确定性显著减少。对于正交部分,不确定度没有变化。这些发现是基于平差算法的代数证明。然后分析了调优库与调整库之间的差异。我们得出的结论是,对于调优库,在调整或调优所基于的灵敏度方向上的不确定性得到改善,类似于调优库的改进。然而,库参数的标称值的位移到它们的调优值,而不是它们的调整值,增加了额外的不确定性。这种额外的不确定性在通过调整得到改善的方向上通常很小。在垂直方向上附加不确定性的大小取决于所进行调谐的具体细节。
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引用次数: 0
Removal of Heavy Metals (Cu, Pb, and Zn) from Contaminated Sediment Using a Flotation Technique 用浮选技术去除污染沉积物中的重金属(Cu、Pb和Zn)
Pub Date : 2012-04-01 DOI: 10.1520/JAI104210
Dileep Palakkeel Veetil, G. Mercier, J. Blais
This paper investigates the effectiveness of froth flotation to remove copper and other heavy metals from dredged anoxic sediments (
研究了泡沫浮选法去除污泥中铜等重金属的效果。
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引用次数: 6
期刊
Journal of Astm International
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