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Cross section determination of^(27)Al(n,2n)^(26)Al reaction induced by 14-MeV neutrons uniting with D-T neutron activation and AMS techniques

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Nuclear Science and Techniques 2024年第6期35卷 78-89页

作者： Xian-lin Yang Chang-lin lan Yu-Ting Wei Yi Zhang Gong Jiang Bo Xie Yu Liu Hong-Tao Shen Xiao-Jun Sun School of Nuclear Science and Technology Lanzhou UniversityLanzhou 730000China MOE Frontiers Science Center for Rare Isotopes Lanzhou UniversityLanzhou 730000China State Key Laboratory of Environmental Geochemistry Institute of GeochemistryChinese Academy of SciencesGuiyang 550081China Guangxi Key Laboratory of Nuclear Physics and Nuclear Technology Guangxi Normal UniversityGuilin 541004China

Aluminum is the primary structural material in nuclear engineering,and its cross section induced by 14-MeV neutrons is of great *** address the issue of insufficient accuracy for the^(27)Al(n,2n)^(26)Al reaction cross section,the activation method and accelerator mass spectrometry(AMS)technique were used to determine the^(27)Al(n,2n)^(26)Al cross section,which could be used as a D-T plasma ion temperature monitor in fusion *** the China Academy of Engineering Physics,neutron activation was performed using a K-400 neutron generator produced by the T(d,n)4He ***^(26)Al∕^(27)Al isotope ratios were measured using the newly installed GYIG 1 MV AMS at the Institute of Geochemistry,Chinese Academy of *** neutron flux was monitored by measuring the activity of 92mNb produced by the 93Nb(n,2n)92mNb *** measured results were compared with available data in the experimental nuclear reaction database,and the measured values showed a reasonable degree of consistency with partially available literature *** newly acquired cross-sectional data at 12 neutron energy points through systematic measurements clarified the divergence,which has two different growth trends from the existing experimental *** obtained results are also compared with the corresponding evaluated database,and the newly calculated excitation functions with TALYS−1.95 and EMPIRE−3.2 codes,the agreement with CENDL−3.2,TENDL-2021 and EMPIRE−3.2 results are generally acceptable.A substantial improvement in the knowledge of the^(27)Al(n,2n)^(26)Al reaction excitation function was obtained in the present work,which will lay the foundation for the diagnosis of the fusion ion temperature,testing of the nuclear physics model,evaluation of nuclear data,etc.

关键词： 14-MeV neutron ^(27)Al(n,2n)^(26)Al Cross section AMS

Evaluation of the clinical effects of atropine in combination with remifentanil in children undergoing surgery for acute appendicitis

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World Journal of Gastrointestinal Surgery 2024年第7期16卷 2065-2072页

作者： Yu-Juan Li Yong-Yan Chen Xia-lan lin Wei-Zhi Zhang Department of Anesthesiology Shanxi Provincial Children’s HospitalTaiyuan 030013Shanxi ProvinceChina

BACKGROUND Acute appendicitis(AA)is the most common cause of acute abdomen in *** significantly influences the surgical treatment of AA in children,making the scientific and effective selection of anesthetics *** To assess the clinical effect of atropine(ATR)in combination with remifentanil(REMI)in children undergoing surgery for *** In total,108 cases of pediatric AA treated between May 2020 and May 2023 were selected,58 of which received ATR+REMI[research group(RG)]and 50 who received REMI[control group(CG)].Comparative analyses were conducted on the time to loss of eyelash reflex,pain resolution time,recovery time from anesthesia,incidence of adverse events(AEs;respiratory depression,hypoxemia,bradycardia,nausea and vomiting,and hypotension),intraoperative responses(head shaking,limb activity,orientation recovery,safe departure time from the operating room),hemodynamic parameters[oxygen saturation(SPO2),mean arterial pressure,heart rate,and respiratory rate],postoperative sedation score(Ramsay score),and pain level[the Face,Legs,Activity,Cry,Consolability(FLACC)Behavioral Scale].RESULTS Compared with the CG,the RG showed significantly shorter time to loss of eyelash reflex,pain resolution,recovery from anesthesia,and safe departure from the operating ***,the incidence rates of overall AEs(head shaking,limb activity,etc.)were lower,and influences on intraoperative hemodynamic parameters and stress response indexes were *** Ramsay score at 30 min after extubation and the FLACC score at 60 min after extubation were significantly lower in the RG than in the *** ATR+REMI is superior to REMI alone in children undergoing AA surgery,with a lower incidence of AEs,fewer influences on hemodynamics and stress responses,and better post-anesthesia recovery.

关键词： Atropine Remifentanil Pediatric acute appendicitis Surgery Clinical efficacy

Benchmark experiment on slab^(238)U with D-T neutrons for validation of evaluated nuclear data

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Nuclear Science and Techniques 2024年第2期35卷 145-159页

作者： Yan-Yan Ding Yang-Bo Nie Yue Zhang Zhi-Jie Hu Qi Zhao Huan-Yu Zhang Kuo-Zhi Xu Shi-Yu Zhang Xin-Yi Pan Chang-lin lan Jie Ren Xi-Chao Ruan Key Laboratory of Nuclear Data China Institute of Atomic EnergyBeijing 102413China School of Nuclear Science and Technology Lanzhou UniversityLanzhou 730000China Institute of Fluid Physics China Academy of Engineering PhysicsMianyang 62100China

A benchmark experiment on^(238)U slab samples was conducted using a deuterium-tritium neutron source at the China Institute of Atomic *** leakage neutron spectra within energy levels of 0.8-16 MeV at 60°and 120°were measured using the time-of-flight *** samples were prepared as rectangular slabs with a 30 cm square base and thicknesses of 3,6,and 9 *** leakage neutron spectra were also calculated using the MCNP-4C program based on the latest evaluated files of^(238)U evaluated neutron data from CENDL-3.2,ENDF/B-Ⅷ.0,JENDL-5.0,and *** on the comparison,the deficiencies and improvements in^(238)U evaluated nuclear data were *** results showed the following.(1)The calculated results for CENDL-3.2 significantly overestimated the measurements in the energy interval of elastic scattering at 60°and 120°.(2)The calculated results of CENDL-3.2 overestimated the measurements in the energy interval of inelastic scattering at 120°.(3)The calculated results for CENDL-3.2 significantly overestimated the measurements in the 3-8.5 MeV energy interval at 60°and 120°.(4)The calculated results with JENDL-5.0 were generally consistent with the measurement results.

关键词： Leakage neutron spectra Uranium D-T neutron source Evaluated nuclear data

大国科技竞争与国际大科学合作的国家战略选择——基于中美案例比较分析

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东北亚论坛 2024年第3期33卷 33-46,127页

作者：林娴岚湖北大学区域与国别研究院武汉430062 湖北大学公共管理学院武汉430062

大科学是人类开拓知识前沿和解决重大问题的手段,而国际大科学合作则是冷战时期大国科技竞争的产物。在传统大国科技竞争视域下,一国竞争地位影响其在国际大科学合作中的战略选择。国际科技领先国家会首选由本国牵头的国际大科学合作模... 详细信息

大科学是人类开拓知识前沿和解决重大问题的手段,而国际大科学合作则是冷战时期大国科技竞争的产物。在传统大国科技竞争视域下,一国竞争地位影响其在国际大科学合作中的战略选择。国际科技领先国家会首选由本国牵头的国际大科学合作模式,领先地位受冲击后退而寻求多国共建模式,并以保守姿态参与其中。非领先国家则首选多国共建类合作模式,以开放式参与提升自身科技实力,实现地位跃升后尝试牵头组织国际大科学合作。当前,大科学的时代内核已由以军用为主转为民用为主,各国参与国际大科学合作的动机不再拘泥于抢占科技制高点的国家战略需求,而更多转向应对人类生存发展问题的全球共性需求。在此背景下,面对固守零和式竞争逻辑的美国在国际大科学合作中有限参与和对中国施压,中国不能陷入传统大国科技竞争模式的窠臼,而应坚持共商共建共享原则与互利共赢理念,不断拓展国际大科学合作空间,与更多国家携手探寻大科学服务于人类命运共同体建设的合作之道。

关键词：科技竞争大科学国际合作中国美国大国科技竞争国际大科学合作

累及甲状腺的朗格汉斯细胞组织细胞增生症的临床病理分析

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复旦学报（医学版） 2024年第1期51卷 89-95页

作者：金哲仵倩林岚唐峰复旦大学附属眼耳鼻喉科医院病理科上海200031 复旦大学附属华山医院病理科上海200040

目的探讨累及甲状腺的朗格汉斯细胞组织细胞增生症(langerhans cell histiocytosis,LCH)的临床病理学特征。方法回顾性分析复旦大学附属华山医院2017年6月至2022年11月期间5例甲状腺受累的LCH患者的临床信息、形态学特征、免疫组化特点... 详细信息

目的探讨累及甲状腺的朗格汉斯细胞组织细胞增生症(langerhans cell histiocytosis,LCH)的临床病理学特征。方法回顾性分析复旦大学附属华山医院2017年6月至2022年11月期间5例甲状腺受累的LCH患者的临床信息、形态学特征、免疫组化特点及分子学检测结果,并结合相关文献进行讨论。结果男性1例,女性4例,29~57岁,中位年龄31岁,超声均表现为甲状腺低弱回声结节。形态学上均显示大量朗格汉斯细胞,细胞含有丰富的嗜酸性胞质,细胞核呈卵圆形,或有纵向核沟,呈咖啡豆样,核仁不明显,伴有大量淋巴细胞、嗜酸性粒细胞浸润。免疫组化显示:5例肿瘤细胞CD1α、S100、langerin均阳性,Ki67增殖指数均大于15%,其中最高达70%。经分子检测的4例病例均未检出BRAF V600E和MAP2K1基因突变。结论甲状腺LCH罕见,多数病例为多系统LCH累及甲状腺,常表现为甲状腺无痛性肿大,治疗方法常为外科手术切除。病理表现为大量朗格汉斯细胞及嗜酸性粒细胞弥漫成片,伴有正常甲状腺滤泡结构破坏。分子学改变上存在BRAF V600E和MAP2K1低突变率的特点。

关键词：朗格汉斯细胞组织细胞增生症(LCH) 甲状腺疾病病理学

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国家药品标准物质替诺福韦的研制

中国新药杂志 2024年第1期33卷 79-82页

作者：刘毅郭贤辉严菁林兰中国食品药品检定研究院北京102629

目的:本研究对首批国家药品标准物质替诺福韦进行研发,为相关药品的质量控制提供保障。方法:综合采用紫外光谱、红外光谱、高分辨质谱、核磁共振谱等技术对首批标准物质替诺福韦的结构进行确证;采用质量平衡法赋值标准物质的含量,并应... 详细信息

目的:本研究对首批国家药品标准物质替诺福韦进行研发,为相关药品的质量控制提供保障。方法:综合采用紫外光谱、红外光谱、高分辨质谱、核磁共振谱等技术对首批标准物质替诺福韦的结构进行确证;采用质量平衡法赋值标准物质的含量,并应用外标法、容量法等佐证量值的准确性;采用动态水分吸附分析法初步研究了本品的引湿性。结果:首批标准物质替诺福韦的含量为93.8%;引湿性研究显示本品6%的水分含量趋于稳定。结论:建立了首批替诺福韦国家药品标准物质。

关键词：替诺福韦国家药品标准物质引湿性动态水分吸附质量平衡法结构确证

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福文化视域下的福州地域文化探析

福州党校学报 2024年第3期 92-96页

作者：林澜福建师范大学文学院福建福州350007

福文化是中华优秀传统文化的重要组成部分,近年来越发受到关注与重视。作为全国唯一一个以“福”字命名的省会城市,福州有着深厚的福文化积淀。以地名文化、数字文化和饮食文化这三种地域文化为代表,探讨三种文化中蕴含的福文化内涵。... 详细信息

福文化是中华优秀传统文化的重要组成部分,近年来越发受到关注与重视。作为全国唯一一个以“福”字命名的省会城市,福州有着深厚的福文化积淀。以地名文化、数字文化和饮食文化这三种地域文化为代表,探讨三种文化中蕴含的福文化内涵。化解福文化传承发展过程中面临的困难与挑战,应积极探索福州地名文化、数字文化、饮食文化与福文化相融合的创新发展思路,更好地传承发扬带有福州地域特色的福文化。

关键词：福州福文化地名文化数字文化饮食文化

振弦式传感器在水库大坝渗流压力自动化监测中的应用

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吉林水利 2024年第3期 54-58页

作者：林岚福建芗江工程项目管理有限公司福建漳州363215

基于漳浦县水库大坝安全监测的建设目标,对前端感知设备布设模块进行探究,分析振弦式传感器在水库大坝渗流压力自动化监测中的应用方法。通过振弦式传感器的选择与布置、传感器校准、数据分析和实时监测,提升对漳浦县14座水库的渗流压... 详细信息

基于漳浦县水库大坝安全监测的建设目标,对前端感知设备布设模块进行探究,分析振弦式传感器在水库大坝渗流压力自动化监测中的应用方法。通过振弦式传感器的选择与布置、传感器校准、数据分析和实时监测,提升对漳浦县14座水库的渗流压力监测效率,实现数字化、智慧化的水库运行与管理。

关键词：振弦式传感器水库大坝压力监测

高温高压N_(2)/CO_(2)与压裂液相互作用机理研究

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广东化工 2024年第10期51卷 61-63,60页

作者：兰林中国石化西南油气分公司工程技术研究院四川德阳618000

为研究川西致密气藏注气增能压裂对压裂液性能影响,基于川西致密气藏储层条件,开展致密气藏高温高压可视化相态变化及前置/伴注N_(2)/CO_(2)与压裂液相互作用实验。结果表明:N_(2)入井后一直以气态形式存在,地层条件下密度为0.152g/cm^(... 详细信息

为研究川西致密气藏注气增能压裂对压裂液性能影响,基于川西致密气藏储层条件,开展致密气藏高温高压可视化相态变化及前置/伴注N_(2)/CO_(2)与压裂液相互作用实验。结果表明:N_(2)入井后一直以气态形式存在,地层条件下密度为0.152g/cm^(3);CO_(2)从液态变为气态再变为液态即超临界状态,地层条件下密度为0.637g/cm^(3);N_(2)在压裂液中主要以束缚气形式溶解,但随着气泡消失基本无溶解性,CO_(2)在溶解过程中存在三种形式:束缚气、溶解气、消耗气,使得溶解气量远远大于N_(2);同种气体不同注气方式下,N_(2)伴注对压裂液黏度影响幅度是前置1.16~2.01倍,CO_(2)伴注对压裂液黏度影响幅度是前置2.0~2.38倍。注入CO_(2)对压裂液黏度影响较N_(2)影响幅度大,其中伴注CO_(2)对压裂液黏度影响幅度是N_(2)的2.45倍、前置为1.74倍,建议现场应用采用前置注入方式。

关键词：致密气藏注气增能压裂压裂液性能