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Development and Verification of an SP3 Code Using Semi-Analytic Nodal Method for Pin-by-Pin Calculation 被引量:1
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作者 Chuntao Tang 《Journal of Physical Science and Application》 2017年第2期10-17,共8页
SP3 (simplified P3) theory is widely used in LWR (light water reactor) analyses to partly capture the transport effect, especially for pin-by-pin core analysis with pin size homogenization. In this paper, a SP3 co... SP3 (simplified P3) theory is widely used in LWR (light water reactor) analyses to partly capture the transport effect, especially for pin-by-pin core analysis with pin size homogenization. In this paper, a SP3 code named STELLA is developed and verified at SNERDI (Shanghai Nuclear Engineering Research and Design Institute). For SP3 method, neutron transport equation can be transformed into two coupled equations in the same mathematical form as diffusion equation. In this work, SANM (semi-analytic nodal method) is used to solve diffusion-like equation, due to its easy to handle multi-group problem. Whole core nodal boundary net current coupling is used to improve convergence stability in SANM, instead of solving two-node problem. CMFD (coarse-mesh finite difference) acceleration method is employed for 0-th SP3 equation, which represents the neutron balance relationship. Three benchmarks are used to verify the SP3 code, STELLA. The first one is a self-defined one dimensional problem, which demonstrates SP3 method is extremely accurate, due to no academic approximation in one dimensional for SP3. The second one is a two dimensional one-group problem cited from Larsen's paper, which is usually used to verify and prove the SP3 code correct and accurate. And the third one is modified from 2D C5G7-MOX benchmark, whose numerical results indicate that STELLA is accurate and efficient in pin size level, compared to diffusion model. 展开更多
关键词 sp3 method semi-analytic nodal method pin-by-pin CMFD C5G7-MOX benchmark.
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用于pin-by-pin输运计算的SP3解析基函数展开节块方法研究 被引量:4
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作者 彭良辉 汤春桃 +2 位作者 毕光文 张宏博 杨波 《原子能科学技术》 EI CAS CSCD 北大核心 2020年第7期1241-1247,共7页
基于三阶简化球谐函数(SP3)方法,分别采用3种不同的偏流表达形式,开发了SP3解析基函数展开节块程序。利用基准例题对程序进行了数值检验,并对3种偏流表达形式的计算精度进行了对比分析。数值结果表明:SP3解析基函数展开节块方法应用于pi... 基于三阶简化球谐函数(SP3)方法,分别采用3种不同的偏流表达形式,开发了SP3解析基函数展开节块程序。利用基准例题对程序进行了数值检验,并对3种偏流表达形式的计算精度进行了对比分析。数值结果表明:SP3解析基函数展开节块方法应用于pin-by-pin输运计算时,能获得较高的棒功率计算精度;3种偏流表达形式中,Marshak偏流表达形式计算精度最高,另外两种偏流表达形式计算精度稍差,但更利于程序算法简化及并行算法设计。 展开更多
关键词 sp3方法 解析基函数展开节块方法 pin-by-pin输运 偏流表达形式
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Recent advances in sulfenylation of C(sp^3)-H bond under transition metal-free conditions
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作者 Xin-Ming Xu De-Mao Chen Zu-Li Wang 《Chinese Chemical Letters》 SCIE CAS CSCD 2020年第1期49-57,共9页
In recent years,the transition metal-free sulfenylation of C-H bond for C-S formation has been rapidly advanced and has become an eco-friendly synthetic tool for pharmacists and organic chemists.Various natural or bio... In recent years,the transition metal-free sulfenylation of C-H bond for C-S formation has been rapidly advanced and has become an eco-friendly synthetic tool for pharmacists and organic chemists.Various natural or bioactive molecules such as(hetero)arenes,olefins,carbonyl compounds,alkanes,have been employed for sulfenylating reactions.This review will focus on the recent five-year advances in C-S bond formation via direct sulfenylation of C(sp^3)-H bonds under metal-free conditions and elaborate their mechanisms from a new perspective. 展开更多
关键词 SULFENYLATION C(sp^3)-H bond METAL-FREE Reaction mechanism Synthetic method
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MMP-13和TIMP-3在子宫肌瘤中的表达及意义 被引量:2
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作者 许艳瑾 秦天 +3 位作者 史玲 刘丽 周利敏 尹伶 《实用预防医学》 CAS 2013年第2期200-202,共3页
目的观察基质金属蛋白酶-13(MMP-13)和其抑制剂-3(TIMP-3)在子宫肌瘤组织中的表达情况,探讨MMP-13和TIMP-3与子宫肌瘤发生的关系与临床意义。方法采用免疫组织化学方法(S-P法)对57例子宫肌瘤患者进行MMP-13和TIMP-3蛋白表达的检测,并与4... 目的观察基质金属蛋白酶-13(MMP-13)和其抑制剂-3(TIMP-3)在子宫肌瘤组织中的表达情况,探讨MMP-13和TIMP-3与子宫肌瘤发生的关系与临床意义。方法采用免疫组织化学方法(S-P法)对57例子宫肌瘤患者进行MMP-13和TIMP-3蛋白表达的检测,并与45例子宫肌瘤瘤旁组织中MMP-13和TIMP-3表达比较。结果 MMP-13和TIMP-3蛋白在子宫肌瘤组织中多呈阳性表达,在子宫肌瘤瘤旁组织中多呈阴性表达,差异有统计学意义(P<0.05)。结论 MMP-13与TIMP-3在子宫肌瘤组织中异常表达,可能与子宫肌瘤的发生有关。 展开更多
关键词 基质金属蛋白酶-13(MMP-13) 基质金属蛋白酶抑制剂-3(TIMP-3) 子宫肌瘤 S-P法
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