检索结果-南通市图书馆

Study on the off situ reconstruction of the core neutron field based on dual-task hybrid network architecture

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Nuclear Science and Techniques 2025年第1期36卷 175-191页

作者： Pei Cao Hui Ding Cheng-long Cao Zi-Hui Yang Guo-min Sun School of Artificial Intelligence and Big Data Hefei UniversityHefei 230001China College of Electronic Engineering National University of Defense TechnologyHefei 230001China Institute of Nuclear Energy Safety Technology HFIPSChinese Academy of SciencesHefei 230027China

The off situ accurate reconstruction of the core neutron field is an important step in realizing real-time reactor *** existing off situ reconstruction method of the neutron field is only applicable to cases wherein a single region changes at a specified location of the ***,when the neutron field changes are complex,the accurate identification of the individual changed regions becomes challenging,which seriously affects the accuracy and stability of the neutron field ***,this study proposed a dual-task hybrid network architecture(DTHNet)for off situ reconstruction of the core neutron field,which trained the outermost assembly reconstruction task and the core reconstruction task jointly such that the former could assist the latter in the reconstruction of the core neutron field under core complex ***,to exploit the characteristics of the ex-core detection signals,this study designed a global-local feature upsampling module that efficiently distributed the ex-core detection signals to each reconstruction unit to improve the accuracy and stability of *** experiments were performed on the simulation datasets of the CLEAR-I reactor to verify the accuracy and stability of the proposed *** results showed that when the location uncertainty of a single region did not exceed nine and the number of multiple changed regions did not exceed ***,the reconstructed ARD was within 2%,RD_(max)was maintained within 17.5%,and the number of RD≥10%was maintained within ***,when the noise interference of the ex-core detection signals was within±2%,although the average number of RD≥10%increased to 16,the average ARD was still within in 2%,and the average RD_(max)was within 22%.Collectively,these results show that,theoretically,the DTHNet can accurately and stably reconstruct most of the neutron field under certain complex core changes.

关键词： Real-time reactor monitoring Core neutron field reconstruction Dual-task hybrid network architecture Global-local feature upsampling module

Biomaterials for surgical repair of osteoporotic bone defects

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2025年第1期36卷 92-98页

作者： Xu Luo Jinwen Xiao Qiming Yang Xiaolong Lu Qianjun Huang Xiaojun ai Bo Li Li Sun long Chen Department of Orthopedics Guizhou Provincial People’s HospitalGuiyang 550000China Medical College Guizhou UniversityGuiyang 550000China Graduate School Guizhou University of Traditional Chinese MedicineGuiyang 550025China

As the global population ages,osteoporotic bone fractures leading to bone defects are increasingly becoming a significant challenge in the field of public *** this disease faces many challenges,especially in the context of an imbalance between osteoblast and osteoclast ***,the development of new biomaterials has become the *** article reviews various design strategies and their advantages and disadvantages for biomaterials aimed at osteoporotic bone ***,current research progress indicates that innovative design,functionalization,and targeting of materials can significantly enhance bone regeneration under osteoporotic *** comprehensively considering biocompatibility,mechanical properties,and bioactivity,these biomaterials can be further optimized,offering a range of choices and strategies for the repair of osteoporotic bone defects.

关键词： Osteoporotic bone defect Biomaterials Nanomaterials Bone tissue engineering Bone regeneration

Zinc finger transcription factors BnaSTOP2s regulate sulfur metabolism and confer Sclerotinia sclerotiorum resistance in Brassica napus

在线全文

学校读者我要写书评

暂无评论

Journal of Integrative Plant Biology 2025年第1期67卷 101-116页

作者： Lihong Dai Zhaoqi Xie Tianxu ai Yushun Jiao Xiaoyi Lian Angchen long Jinyun Zhang Guangsheng Yang Dengfeng Hong National Key Laboratory of Crop Genetic Improvement College of Plant Science and TechnologyHuazhong Agricultural UniversityWuhan 430070China Lushan Botanical Garden Chinese Academy of SciencesJiujiang 332900China Hubei Hongshan Laboratory Wuhan 430070China Yazhouwan National Laboratory Sanya 572024China

Rapeseed(Brassica napus L.)exhibits high-sulfur requirements to achieve optimal growth,development,and pathogen *** the importance of sulfur,the mechanisms regulating its metabolism and disease resistance are not fully *** this study,we found that the zinc finger transcription factors BnaSTOP2s play a pivotal role in sulfur metabolism and Sclerotinia sclerotiorum *** findings indicate that BnaSTOP2s are involved in sulfur metabolism,as evidenced by extensive protein interaction ***2s knockout reduced the content of essential sulfurcontaining metabolites,including glucosinolate and glutathione,which is consistent with the significantly lowered transcriptional levels of BnaMYB28s and BnaGTR2s,key factors involved in glucosinolate synthesis and transportation,*** RNA-seq analysis revealed the substantial effect of BnaSTOP2s on sulfur metabolism from roots to siliques,which serve as pivotal sources and sinks for sulfur metabolism,***,we found that leaf lesion size significantly decreased and increased in the BnaSTOP2-OE and Bnastop2 mutants,respectively,compared with the wild-type during *** infection,suggesting a vital role of BnaSTOP2s in plant defense *** conclusion,BnaSTOP2s act as global regulators of sulfur metabolism and confer resistance to *** infection in ***,they have potential implications for improving crop resilience.

关键词： BnaSTOP2 Brassica napus CRISPR/Cas9 glucosinolate Sclerotinia sclerotiorum sulfur metabolism

在线全文

学校读者我要写书评

暂无评论

南沙群岛海域沉积物稀土元素地球化学研究

热带海洋学报 2005年第1期24卷 8-14页

作者：田正隆戴英龙爱民陈绍勇中国科学院南海海洋研究所热带海洋环境动力学重点实验室广东广州510301 中国地质大学海洋地学研究中心北京100083

应用电感耦合等离子质谱法测定了南沙群岛海域3个站位沉积物中的稀土元素(REE)和过渡金属元素的含量,讨论了沉积物中REE水平及深度分布的变化特征,以特征金属元素为指标对3个站位进行了沉积区划分,同时对 REE与 10 种金属元素的相关性... 详细信息

应用电感耦合等离子质谱法测定了南沙群岛海域3个站位沉积物中的稀土元素(REE)和过渡金属元素的含量,讨论了沉积物中REE水平及深度分布的变化特征,以特征金属元素为指标对3个站位进行了沉积区划分,同时对 REE与 10 种金属元素的相关性进行了研究。结果表明,3个站分别为近大陆架残留沉积区、大陆坡深海沉积区和碳酸盐沉积区,各站 REE含量存在较大差别,但分布模式相似,均为轻稀土富集型和 Eu负异常,每个站各层 REE分布模式线几乎重合;3 个站沉积物中 REE都与 Ti、Zr有很好的相关性,与其它金属元素不存在明显的相关性,表明3个站沉积物物源主要为陆源上地壳物质。结合测年资料,认为该海域3个站全新世以来沉积物物源变化很小,沉积环境稳定。

关键词：南沙群岛海域稀土元素沉积物物源沉积环境

利用三维荧光光谱和吸收光谱研究雨水中CDOM的光学特性

在线全文

学校读者我要写书评

暂无评论

光谱学与光谱分析 2010年第9期30卷 2413-2416页

作者：程远月郭卫东龙爱民陈绍勇中国科学院南海海洋研究所中国科学院热带海洋环境动力学重点实验室广东广州510301 近海海洋环境科学国家重点实验室(厦门大学) 厦门大学海洋与环境学院福建厦门361005 中国科学院广州地球化学研究所广东广州510640

利用荧光激发-发射矩阵光谱（excitation-emission matrix spectroscopy,EEMs）技术并结合吸收光谱初步研究了2007年厦门梅雨季节期间雨水中有色溶解有机物（CDOM）的光学特性。结果表明,雨水CDOM的吸收光谱随波长呈指数衰减,代表雨水C... 详细信息

利用荧光激发-发射矩阵光谱（excitation-emission matrix spectroscopy,EEMs）技术并结合吸收光谱初步研究了2007年厦门梅雨季节期间雨水中有色溶解有机物（CDOM）的光学特性。结果表明,雨水CDOM的吸收光谱随波长呈指数衰减,代表雨水CDOM相对含量的吸收系数a（300）范围在0.27~3.45 m-1,均值为1.08 m-1;且降雨初期CDOM含量高于降雨后期。这表明人类活动和当地的大气污染或空气质量对雨水中CDOM的贡献。雨水CDOM的EEMs光谱揭示出2类4个主要荧光峰（2个类腐殖质荧光A和C与2个类蛋白质荧光B和S）的存在。其中2个类腐殖质荧光A和C之间以及2个类蛋白质荧光B和S之间均存在一定的正相关性,说明其具有相同来源或存在某种内部联系。2个类腐殖质荧光与吸收系数a（300）之间的强正相关性,说明其控制吸收特性的基团可能与控制其荧光特性的基团具有相似性质。结果表明雨水CDOM高吸收和荧光特性在大气化学中的作用不容轻视,在受大气水体影响的太阳辐射的光谱衰减中可能起着潜在的重要作用。

关键词：有色溶解有机物荧光激发-发射矩阵光谱吸收雨水

在线全文

学校读者我要写书评

暂无评论

北部湾冬季的生物固氮作用

海洋环境科学 2012年第4期31卷 524-528页

作者：石荣贵连忠廉龙爱民郑爱榕陈敏吕娥中国科学院南海海洋研究所热带海洋环境国家重点实验室广东广州510301 中国科学院研究生院北京100049 国家海洋局南海环境监测中心广东广州510300 厦门大学海洋与环境学院海洋学系福建厦门361005

2006年12月至2007年1月(冬季)期间,对北部湾海区的生物固氮作用进行了初步研究,结果表明:当培养时间为2 h时,水体浮游生物固氮速率最高,且固氮速率随着培养时间的延长而逐渐降低。北部湾冬季固氮速率存在周日变化,8∶10～11∶10时段内... 详细信息

2006年12月至2007年1月(冬季)期间,对北部湾海区的生物固氮作用进行了初步研究,结果表明:当培养时间为2 h时,水体浮游生物固氮速率最高,且固氮速率随着培养时间的延长而逐渐降低。北部湾冬季固氮速率存在周日变化,8∶10～11∶10时段内固氮速率达到最高值。10 m和30 m水深在夜间仍能检测到固氮活性,这可能是浮游生物昼夜垂直移动引起的。北部湾冬季固氮速率的范围为447.5～1447.2 pmol/(L.h),固氮速率呈现出从湾内往湾外不断增加的趋势,湾口海区(B06站)的积分固氮速率为319.5μmol/(m2.d)。B06站Fe加富实验表明,添加100 nmol/L Fe能够明显促进生物固氮作用,北部湾冬季湾口海区生物固氮作用可能受到Fe限制。

关键词：生物固氮 Fe限制北部湾冬季

Small extracellular vesicles derived from human induced pluripotent stem cell-differentiated neural progenitor cells mitigate retinal ganglion cell degeneration in a mouse model of optic nerve injury

在线全文

学校读者我要写书评

暂无评论

Neural Regeneration Research 2025年第2期20卷 587-597页

作者： Tong Li Hui-min Xing Hai-Dong Qian Qiao Gao Sheng-Lan Xu Hua Ma Zai-long Chi State Key Laboratory of Ophthalmology Optometry and Visual ScienceEye HospitalWenzhou Medical UniversityWenzhouZhejiang ProvinceChina National Clinical Research Center for Ocular Diseases Eye HospitalWenzhou Medical UniversityWenzhouZhejiang ProvinceChina

Several studies have found that transplantation of neural progenitor cells(NPCs)promotes the survival of injured ***,a poor integration rate and high risk of tumorigenicity after cell transplantation limits their clinical *** extracellular vesicles(sEVs)contain bioactive molecules for neuronal protection and *** studies have shown that stem/progenitor cell-derived sEVs can promote neuronal survival and recovery of neurological function in neurodegenerative eye diseases and other eye *** this study,we intravitreally transplanted sEVs derived from human induced pluripotent stem cells(hiPSCs)and hiPSCs-differentiated NPCs(hiPSC-NPC)in a mouse model of optic nerve *** results show that these intravitreally injected sEVs were ingested by retinal cells,especially those localized in the ganglion cell *** with hiPSC-NPC-derived sEVs mitigated optic nerve crush-induced retinal ganglion cell degeneration,and regulated the retinal microenvironment by inhibiting excessive activation of *** analysis further revealed that hiPSC-NPC derived sEVs transported neuroprotective and anti-inflammatory miRNA cargos to target cells,which had protective effects on RGCs after optic nerve *** findings suggest that sEVs derived from hiPSC-NPC are a promising cell-free therapeutic strategy for optic neuropathy.

关键词： exosome miRNA neural progenitor cell neurodegeneration neuroinflammation neuroprotection optic nerve crush optic neuropathy retinal ganglion cell small extracellular vesicles

在线全文

学校读者我要写书评

暂无评论

南沙群岛海域以钡为指标的古生产力研究

海洋学报 2005年第4期27卷 53-58页

作者：陈绍勇田正隆龙爱民吴云华中国科学院南海海洋研究所广东广州510301

对南沙群岛海域3个站位沉积物柱样中的钡、钛元素进行了分析,以AMS14Corc(有机碳)方法进行沉积物年代测定.对钡、钛元素的平面和深度分布特征进行研究发现,其中2个站位生源钡变化趋势明显,在距2800a左右生源钡含量开始明显升高.另一个... 详细信息

对南沙群岛海域3个站位沉积物柱样中的钡、钛元素进行了分析,以AMS14Corc(有机碳)方法进行沉积物年代测定.对钡、钛元素的平面和深度分布特征进行研究发现,其中2个站位生源钡变化趋势明显,在距2800a左右生源钡含量开始明显升高.另一个站位钡的变化趋势比较复杂,结合对稀土元素、钛和其他过渡金属元素的分析,认为主要是由于该站位沉积物中陆源组分含量较高、沉积环境复杂所致.根据钡的古生产力计算模型估算了2个站位的古生产力状况,同时探讨了2个站位的古生产力变化的影响因素,认为这2个站位古生产力变化可能与全新世晚期的气候变冷事件有关.

关键词：南沙群岛海域钡钛古生产力

海水中溶解态铁的伏安极谱法与液芯波导光纤法测定

在线全文

学校读者我要写书评

暂无评论

海洋学报 2009年第1期31卷 152-158页

作者：龙爱民党爱翠程远月陈绍勇中国科学院南海海洋研究所中国科学院热带海洋环境动力学重点实验室广东广州510301 中国科学院研究生院北京100039 中国科学院广州地球化学研究所中国科学院边缘海地质重点实验室广东广州510640

1引言尽管铁为地壳中丰度位居第4的元素,但它在海水中的浓度却很低,浓度一般为0·05~2·0 nmd/dm3[1]。近年来,国内外的海洋科学家在进行海洋生态系统初级生产力、碳循环等重要生态过程及其对全球气候变化影响的研究中发现,海洋中的铁... 详细信息

1引言尽管铁为地壳中丰度位居第4的元素,但它在海水中的浓度却很低,浓度一般为0·05~2·0 nmd/dm3[1]。近年来,国内外的海洋科学家在进行海洋生态系统初级生产力、碳循环等重要生态过程及其对全球气候变化影响的研究中发现,海洋中的铁对浮游植物的生长、初级生产力的水平有着十分重要的影响甚至成为了“限制性因子”,在多个“高营养盐、低叶绿素(HNLC)”海区所实施的富铁实验的结果很好地印证了铁元素在海洋生态系统中的重要作用[2]。最新的研究成果表明近岸海水中的铁可能对浮游植物的种类组成起到决定性的作用,进而对包括氮、磷、硅在内的其他元素的生物地球化学行为产生深远的影响[3]。尽管国内外研究者们对铁在海洋生态系统的作用已经达成了一定的共识,但有关铁在海水中的物理化学形态及其对海水中浮游植物的生物有效性方面的报道却甚少。其主要原因在于对海水中极低浓度铁的化学分析技术尚不够精准。海水中铁的分析测定,一方面要求所用的测试手段足够精确和灵敏,检出限足够低;另一方面要求样品的采集与前处理不仅要采用高标准的清洁技术,而且步骤要尽量简单,以期最大限度地降低对样品的污染。伏安极谱法是现代仪器分析的一个重要分支,它以其灵敏度高、...

关键词：铁伏安极谱法液芯波导光纤法海水