检索结果-南通市图书馆

基于多元定标法的矿物铀元素光纤式激光诱导击穿光谱定量分析

在线全文

学校读者我要写书评

暂无评论

中国激光 2024年第8期51卷 234-243页

作者：郭歆宇吴坚时铭鑫朱欣欣邱岩李京徽吴迪宋自远西安交通大学电气绝缘与电力设备国家重点实验室陕西西安710049 中国原子能科学研究院北京102413 西安交通大学电子物理与器件教育部重点实验室陕西西安710049

针对核工业辐照环境下铀等元素组分远程测量的需求,基于光纤式激光诱导击穿光谱系统,研究了铀矿石样品中铀元素谱线强度的影响因素及其定量测量方法。在实验中,采用光纤传输30 mJ脉冲激光并将其聚焦在铀矿石粉末压片上产生激光诱导等离... 详细信息

针对核工业辐照环境下铀等元素组分远程测量的需求,基于光纤式激光诱导击穿光谱系统,研究了铀矿石样品中铀元素谱线强度的影响因素及其定量测量方法。在实验中,采用光纤传输30 mJ脉冲激光并将其聚焦在铀矿石粉末压片上产生激光诱导等离子体,然后通过同轴光纤回传等离子体自发光。首先,研究了气氛环境对铀元素谱线的影响。结果显示:氦气气氛下铀质量分数为0.425%的样本的U II 409.013 nm谱线的信噪比相比空气气氛下提高了1.37倍,同时,氦气气氛下铀质量分数为0.0726%的样本的U II 409.013 nm谱线的信噪比达到了8.9。其次,根据谱线信噪比、信背比和净强度将系统的探测延时优化至1000 ns。最后,提出了一种基于内标法原理的多元线性定标方法,通过引入基质元素与铀的谱线比值进行回归,使得铀的检测限达到142 mg/kg,定量限达到426 mg/kg。与基于谱线峰值的单变量回归方法相比,所提多元线性定标方法将铀元素的定标决定系数R2从0.9711提升到0.9984,均方根误差从0.200%减小到0.0404%。本文方法和研究结果可为铀元素含量的测量提供技术支撑。

关键词：光谱学激光诱导击穿光谱铀矿元素检测多元定标法

在线全文

学校读者我要写书评

暂无评论

LiF/GAP协同作用改善硼粉的燃烧性能

火炸药学报 2024年第3期47卷 279-286,I0006页

作者：伍双艳王吉权邵建刘俊陈九玉朱宝忠孙运兰常州大学石油与天然气工程学院·能源学院江苏常州213000

以氟化锂/缩水甘油叠氮化物聚合物(LiF/GAP)为界面层对微米硼进行改性,研究LiF/GAP协同作用对硼粉热行为、燃烧性能和凝聚相燃烧产物的影响。结果表明,通过硅烷偶联剂处理后,硼粉表面黏结性得以提高,LiF能够较好地包覆在硼粉表面;GAP在... 详细信息

以氟化锂/缩水甘油叠氮化物聚合物(LiF/GAP)为界面层对微米硼进行改性,研究LiF/GAP协同作用对硼粉热行为、燃烧性能和凝聚相燃烧产物的影响。结果表明,通过硅烷偶联剂处理后,硼粉表面黏结性得以提高,LiF能够较好地包覆在硼粉表面;GAP在400℃之前抑制了LiF与硼表面氧化膜的反应,使LiF的除膜效应延后至硼粉氧化增重阶段,从而将更多的活性硼暴露在空气中发生氧化,促进了硼粉的燃烧;LiF和GAP协同作用显著改善了硼粉的燃烧性能,尤其当LiF和GAP质量分数均为10%时,作用效果最为明显。此外,LiF和GAP协同作用有效抑制了燃烧过程中硼粉团聚,使其凝聚相燃烧产物粒径降低。

关键词：物理化学硼颗粒 LiF/GAP协同作用燃烧特性团聚抑制燃烧机理

Status of aquatic organisms resources and their environments in yangtze River system(2017-2021)⋆

在线全文

学校读者我要写书评

暂无评论

Aquaculture and Fisheries 2024年第5期9卷 833-850页

作者： Haile yang Li Shen Yongfeng He Huiwu Tian Lei Gao Jinming Wu Zhigang Mei Nian Wei Lin Wang Tingbing zhu Feifei Hu Jinling Gong Hongchun Du Xinbin Duan Huatang Deng Daoqun Wang Fengyue zhu Yunfeng Li Fan Wu Huijun Ru yan Zhang Junyi Li Junlin yang Yuntao Zhou Dongdong Fang Yinping Wang Danqing Lin yanping yang Peijie Li Silei Liu jian yang Ping zhuang Sikai Wang Tao Zhang Gang yang Wenbo yang Lilai Yuan Kun Cao Shuo Xu Huiyuan Liu Zhiqiang Liang Chongrui Wang Hong Li Xiping Yuan Xin yang Yilong Fu yanping Zhang Haixin Zhang Zhiying Tao Sheng Wang Xiaoping Gao Binsong Jin Kemao Li Guojie Wang Shenglong jian Yingqin Li Chenjiang Xue Chunyun Lei shaowei Xue Yi Sun Bin zhu Ke shao Xingkun Hu Meihua Xiong Jun Du Bin He Tao yan Yingying Huang Yuanchao Zou Biwen Xie Yongming Wang Bin Li Fei Liu Yaoyao Zhang Fei Fan Zhijian Wang Jing Huang Haoran Gu Hailong Ge yan Dan yan Li Shuqiao Wang Chuang Zhang Lu Zhou Xue Wang Sheng Zeng yan Xiang Xugang He jianhui Qin Chengxing Xia Jie Hou Yifu Shi Lifang Gao Zhiqiang zhu Hongbao Shen Yun Du Xuejun Duan Jiawu Xiong Deguo yang shaoping Liu Zhaohui Ni Hui Zhang Kai Liu Feng Zhao Yingren Li jianwei Wang Qiwei Wei yangtze River Fisheries Research Institute Chinese Academy of Fishery SciencesWuhan430223China Institute of Hydrobiology Chinese Academy of SciencesWuhan430072China Fishery Resource and Environment Research Center Chinese Academy of Fishery SciencesBeijing100141China Key Laboratory of Freshwater Fisheries and Germplasm Resources Utilization Ministry of Agriculture and Rural AffairsFreshwater Fisheries Research CenterChinese Academy of Fishery SciencesWuxi214081China East China Sea Fisheries Research Institute Chinese Academy of Fishery SciencesShanghai200090China Institute of Fisheries Engineering Chinese Academy of Fishery SciencesBeijing100141China Hunan Fisheries Science Institute Changsha410153China jiangxi Fisheries Research Institute Nanchang330039China Jiujiang Academy of Fishery Sciences Jiujiang332000China School of Life Sciences Nanchang UniversityNanchang330031China Qinghai Provincial Fishery Technology Extension Center Xining810012China Yunnan Academy of Fishery Sciences Kunming650111China Institute of Hydroecology Ministry of Water Resources and Chinese Academy of SciencesWuhan430079China Fisheries Institute Sichuan Academy of Agricultural SciencesChengdu611731China School of Life Sciences Neijiang Normal UniversityNeijiang641100China School of Life Sciences Southwest UniversityChongqing400715China Chongqing Fishery Sciences Research Institute Chongqing401120China Guizhou Fisheries Research Institute Guiyang550025China College of Fisheries Huazhong Agricultural UniversityWuhan430072China Hubei Fisheries Science Research Institute Wuhan430070China Shaanxi Fisheries Research Institute Xi’an710086China Innovation Academy for Precision Measurement Science and Technology Chinese Academy of SciencesWuhan430077China Nanjing Institute of Geography and Limnology Chinese Academy of SciencesNanjing210008China Central South Inventory and Planning Institute of State Forestry and Grassland Administration Changsha410014China

The yangtze River is the mother river of *** promote the aquatic ecosystem protection of the great river,the Project of yangtze Fisheries Resources and Environment Investigation(2017-2021)supported by the Ministry of Agriculture and Rural Affairs,*** carried out by 24 institutes and universities that located in the yangtze River basin surveys the status of(1)fish species composition and spatial distribution,(2)current fish abundance,(3)endangered fishes,(4)yangtze finless porpoise,(5)aquatic eco-environments,(6)water-level fluctuation areas,(7)capture fisheries and recreational fisheries of the yangtze River mainstream and 10 of its main tributaries,including Yalong River,Heng River,Min River(including Dadu River),Chishui River,Tuo River,Jialing River,Wu River,Han River,Dongting Lake and Poyang *** results showed that there were 443 fish species(belonging to 163 genus,37 families,and 18 orders)before 2017,but only 323 fish species(including 15 new recorded exotic species)were recorded in the project of *** them,Cyprinus carpio,Carassius auratus,Hypophthalmichthys molitrix,Pelteobagrus fulvidraco,Coilia brachygnathus,Silurus asotus,Saurogobio dabryi,Ctenopharyngodon idellus,Pelteobagrus nitidus,Hemiculter leucisculus,Siniperca chuatsi,Coreius heterodon,Culter alburnus,Parabramis pekinensis,and Aristichthys nobilis were the dominant species across the whole yangtze River *** is estimated that there were 886 million individuals weighing 124.8 million kg,merely equivalent to 27.3%of the resources in 1950s,30.9%of the resources in 1960s,or 58.7%of the resources in *** the new list of protected fishes that recorded in the yangtze River system,only 15 of 29 were collected in this project of *** gladius has been affirmed to be Extinct by International Union for Conservation of Nature(IUCN).The wild individuals of Tenualosa reevesii and Luciobrama macrocephalus have disappeared for many years and maybe have been extinct

关键词： Fishes yangtze finless porpoise Resources Aquatic ecosystem Fisheries Background investigation yangtze river system

The In-Flight Realtime Trigger and Localization Software of GECAM

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

Research in Astronomy and Astrophysics 2024年第10期24卷 11-24页

作者： Xiao-Yun Zhao shao-Lin Xiong Xiang-yang Wen Xin-Qiao Li Ce Cai Shuo Xiao Qi Luo Wen-Xi Peng Dong-Ya Guo Zheng-Hua An Ke Gong Jin-Yuan Liao yan-qiu Zhang Yue Huang Lu Li Xing Wen Fei Zhang Jing Duan Chen-Wei Wang Dong-Li Shi Peng Zhang Qi-Bin Yi Chao-yang Li yan-Bing Xu Xiao-Hua Liang Ya-Qing Liu Da-Li Zhang Xi-Lei Sun Fan Zhang Gang Chen Huan-Yu Wang Sheng yang Xiao-Jing Liu Min Gao mao-Shun Li Jin-Zhou Wang Xing Zhou Yi Zhao Wang-Chen Xue Chao Zheng Jia-Cong Liu Xing-Bo Han Jin-Ling Qi Jia Huang Ke-Ke Zhang Can Chen Xiong-Tao yang Dong-Jie Hou Yu-Sa Wang Rui Qiao Xiang ma Xiao-Bo Li Ping Wang Xin-Ying Song Li-Ming Song Shi-Jie Zheng Bing Li Hong-Mei Zhang Yue zhu Wei Chen jian-jian He Zhen Zhang Jin Hou Hong-Jun Wang yan-Chao Hao Xiang-Yu Wang Zong-Yuan yang Zhi-Long Wen Zhi Chang Yuan-Yuan Du Rui Gao Xiao-Fei Lan yan-Guo Li Gang Li Xu-Fang Li Fang-Jun Lu Hong Lu Bin Meng Feng Shi Hui Wang Hui-Zhen Wang Yu-Peng Xu Jia-Wei yang Xue-Juan yang Shuang-Nan Zhang Chao-Yue Zhang Cheng-Mo Zhang Zhi-Cheng Tang Cheng Cheng Key Laboratory of Particle Astrophysics Institute of High Energy PhysicsChinese Academy of SciencesBeijing 100049China University of Chinese Academy of Sciences Chinese Academy of SciencesBeijing 100049China School of Information Science and Technology Southwest Jiaotong UniversityChengdu 611756China Key Laboratory of Stellar and Interstellar Physics and Department of Physics Xiangtan UniversityXiangtan 411105China Physics and Space Science College China West Normal UniversityNanchong 637002China Department of Astronomy Beijing Normal UniversityBeijing 100875China Innovation Academy for Microsatellites of CAS Shanghai 201203China Changchun University of Science and Technology Changchun 130022China Chinese Academy of Sciences South America Center for Astronomy National Astronomical ObservatoriesCASBeijing 100101China

Realtime trigger and localization of bursts are the key functions of GECAM,an all-sky gamma-ray monitor launched on 2020 December *** developed a multifunctional trigger and localization software operating in the CPU of the GECAM Electronic *** onboard software has the following features:high trigger efficiency for real celestial bursts with a suppression of false triggers caused by charged particle bursts and background fluctuation,dedicated localization algorithm optimized for both short and long bursts,and low time latency of the trigger information which is downlinked through the Global Short Message Communication service of the global BeiDou navigation *** paper provides a detailed description of the design and development of the trigger and localization software system for *** covers the general design,workflow,the main functions,and the algorithms used in the *** paper also includes on-ground trigger tests using simulated gamma-ray bursts generated by a dedicated X-ray tube,as well as an overview of the performance for real celestial bursts during its in-orbit operation.

关键词： telescopes instrumentation:detectors methods:observational

The exotically stoichiometric compounds in Al-S system under high pressure

在线全文

学校读者我要写书评

暂无评论

npj Computational materials 2020年第1期6卷 1565-1570页

作者： Sen shao Wenji zhu jian Lv yanchao Wang Yue Chen yanming ma State Key Laboratory of Superhard materials&International Center for Computational Method and Software Jilin UniversityChangchun 130012China Department of Mechanical Engineering The University of Hong KongPokfulam RoadHong KongHong Kong SAR International Center of Future Science Jilin UniversityChangchun 130012China

Aluminum and sulfur,as abundant elements in earth,only form Al_(2)S_(3) in nature at ambient *** has been realized that the stoichiometry of compounds may change under high pressure,which is crucial in the discovery o... 详细信息

关键词： materials system compounds

Multiscale characteristics of the wetting deformation of malan loess in the yan’an area,China

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

Journal of Mountain Science 2021年第4期18卷 1112-1130页

作者： NAN Jing-jing PENG jian-bing zhu Feng-ji ZHAO Jun-yan LENG yan-qiu Department of Geological Engineering Chang’an UniversityXi'an 710054China Key Laboratory of Western China Mineral Resources and Geological Engineering Ministry of EducationXi’an 710054China China JIKAN Research Institute of Engineering Investigations and Design Co. Ltd.Xi’an 710043China

Loess is prone to collapse upon wetting due to its open metastable structure,which poses a considerable threat to the environment,construction processes and human *** this study,double oedometer tests and scanning electron microscopy and mercury intrusion porosimetry analyses were conducted on loess from yan’an to study the macroscopic and microscopic characteristics of loess wetting deformation and the underlying *** wetting collapse of loess under loading depends on the changes in different microstructure levels and *** collapse chain reaction is manifested by the dissipation,scattering and recombination of the cementation,deformation and reorganization of the particles,blocking of the pore channels,decrease in the dominant size and volume of unstable macropores(>14μm)and abundant mesopores(2.5-14μm),increase in the volume of small pores(0.05–2.5μm),and volume contraction at the *** process is dependent on the initial water content,stress level and wetting *** findings can facilitate collapsible loess hazard prevention and geological engineering construction.

关键词： Loess macroscopic wetting deformation Wetting collapse mechanism Microstructure Pore change

Heat-shocked tumor cell lysate-pulsed dendritic cells induce effective anti-tumor immune response in vivo

在线全文

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2006年第3期12卷 473-478页

作者： jian qiu Guo-Wei Li yan-Fang Sui Hong-Ping Song shao-yan Si Wei Ge Department of General Surgery TheSecond Hospital of Xi'an Jiaotong University Xi'an 710004Shaanxi Province China State Key Laboratory of Cancer Biology Department of PathologyThe Fourth Military Medical University Xi'an 710032 ShaanxiProvince China

AIM. To study whether heat-shocked tumor cells could enhance the effect of tumor cell lysate-pulsed dendritic cells （DCs） in evoking anti-tumor immune response in vivo. METHODS： Mouse undifferentiated colon cancer cells （CT-26） were heated at 42℃ for 1 h and then frozenthawed. The bone marrow-derived DCs pulsed with heatshocked CT-26 cell lysate （HSCT-26 DCs） were recruited to immunize syngeneic naive BALB/c mice. The cytotoxic activity of tumor specific cytotoxic T lymphocytes （CTLs） in mouse spleen was evaluated by IFN-enzyme-linked immunospot （ELISpot） and LDH release assay. The immunoprophylactic effects induced by HSCT-26 DCs in mouse colon cancer model were compared to those induced by single CT-26 cell lysate-pulsed DCs （CT-26 DCs） on tumor volume, peritoneal metastasis and survival time of the mice. RESULTS： Heat-treated CT-26 cells showed a higher hsp70 protein expression. Heat-shocked CT-26 cell lysate pulsing elevated the co-stimulatory and MHC-Ⅱ molecule expression of bone marrow-derived DCs as well as interleukin-12 p70 secretion. The IFN-y secreting CTLs induced by HSCT-26 DCs were significantly more than those induced by CT-26 DCs （P=0.002）. The former CTLs＇ specific cytotoxic activity was higher than the latter CTLs＇ at a serial E/T ratio of 10：1, 20：1, and 40：1. Mouse colon cancer model showed that the tumor volume of HSCT-26 DC vaccination group was smaller than that of CT-26 DC vaccination group on tumor volume though there was no statistical difference between them （24 mm^3 vs 8 mm^3, P=0.480）. The median survival time of mice immunized with HSCT-26 DCs was longer than that of those immunized with CT-26 DCs （57 d vs 43 d, P = 0.0384）. CONCLUSION： Heat-shocked tumor cell lysate-pulsed DCs can evoke anti-tumor immune response in vivo effectively and serve as a novel DC-based tumor vaccine.

关键词： Heat shock Tumor Dendritic cell Immune

Boron doped 1T phase MoS_(2) as a cocatalyst for promoting photocatalytic H_(2) evolution of g-C_(3)N_(4) nanosheets

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

中国化学快报:英文版 2023年第10期34卷 102-105页

作者： Pengyuan qiu yan An Xinyu Wang Shanna An Xiaoli Zhang jian Tian Wen zhu School of materials Science and Engineering Shandong University of Science and TechnologyQingdao 266590China State Key Laboratory of materials Processing and Die&Mould Technology School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhan 430074China School of materials Science and Engineering Zhengzhou UniversityZhengzhou 450001China

As one of the 2D transition metal sulfides,1T phase MoS_(2) nanosheets(NSs)have been studied because of their distinguished conductivity and suitable electronic ***,the active sites are limited to a small number of edge sites only,while the basal plane is catalytically ***,we report that boron(B)doped 1T phase MoS_(2) NSs can replace precious metals as a co-catalyst to assist in photocatalytic H_(2) production of 2D layered g-C_(3)N_(4) nanosheets(g-C_(3)N_(4) NSs).The H_(2) evolution rate of prepared B-MoS_(2)@g-C_(3)N_(4) composites with 15 wt%B-MoS_(2)(B-MoS_(2)@g-C_(3)N_(4)–15,1612.75μmol h^(−1) g^(−1))is 52.33 times of pure g-C_(3)N_(4) NSs(30.82μmol h^(−1) g^(−1)).Furthermore,the apparent quantum efficiency(AQE)of B-MoS_(2)@g-C_(3)N_(4)–15 composites under the light atλ=370 nm is calculated and reaches 5.54%.The excellent photocatalytic performance of B-MoS_(2)@g-C_(3)N_(4)–15 composites is attributed to the B ions doping inducing the distortion of 1T phase MoS_(2) crystal,which can activate more base planes to offer more active sites for H_(2) evolution reaction(HER).This work of B-MoS_(2)@g-C_(3)N_(4) composites offers experience in the progress of effective and low-price photocatalysts for HER.

关键词： 1T phase MoS_(2) g-C_(3)N_(4)nanosheets Photocatalytic H_(2)evolution Active sites Boron doping

Fluoxetine,a selective serotonin reuptake inhibitor used clinically,improves bladder function in a mouse model of moderate spinal cord injury

在线全文

学校读者我要写书评

暂无评论

Neural Regeneration Research 2021年第10期16卷 2093-2098页

作者： Long ma Jing-Yuan Tang Jin-Yong Zhou Chen zhu Xin Zhang Ping Zhou qiu Yu yan Wang Xiao-jian Gu Department of Urology Jiangsu Province Hospital of Chinese MedicineAffiliated Hospital of Nanjing University of Chinese MedicineNanjingJiangsu ProvinceChina Department of Central Laboratory Jiangsu Province Hospital of Chinese MedicineAffiliated Hospital of Nanjing University of Chinese MedicineNanjingJiangsu ProvinceChina

After spinal cord injury,the upward conduction of the spinal cord is lost,resulting in the loss of micturition control,which manifests as detrusor sphincter dyssynergia and insufficient *** have shown that serotonergic axons play important roles in the control of the descending urination *** this study,mouse models of moderate spinal cord contusions were *** serotonin agonists quipazine(0.2 mg/kg),8-hydroxy-2-(di-n-propylamino)tetralin(8-OH-DAPT,0.1 mg/kg),buspirone(1 mg/kg),sumatriptan(1 mg/kg),and rizatriptan(50 mg/kg),the serotonin reuptake inhibitors fluoxetine(20 mg/kg)and duloxetine(1 mg/kg),and the dopamine receptor agonist SKF-82197(0.1 mg/kg)were intraperitoneally administered to the model mice 35 days post-injury in an acute *** voided stain on paper method and urodynamics revealed that fluoxetine reduced the amount of residual urine in the bladder and decreased bladder and external urethral sphincter pressure in a mouse model of moderate spinal cord ***,fluoxetine did not improve the micturition function in a mouse model of severe spinal cord *** contrast,the other serotonergic drugs had no effects on the micturition functions of spinal cord injury model *** study was ethically approved by the Institutional Animal Care and Use Committee of jiangsu Province Hospital of Chinese Medicine(approval No.2020DW-20-02)on September 11,2020.

关键词： bladder external urethral sphincter fluoxetine micturition selective serotonin reuptake inhibitor spinal cord injury urodynamics voided stain on paper measurement