检索结果-南通市图书馆

10B-doped MCP detector developed for neutron resonance imaging at Back-n white neutron source

在线全文

学校读者我要写书评

暂无评论

Nuclear Science and Techniques 2024年第8期35卷 58-68页

作者： Qiang Li Li‑Jiao Wang Jing‑Yu Tang Xiang‑Biao Qiu Zhen Chen Mao‑yuan Zhao Chang‑Jun Ning kai Pan Wei Xu Tao Li Su‑Peng Lu Han Yi Rui‑Rui Fan Chang‑Qing Feng Rong Zhang Xiao‑yang Sun Qi An Hao‑Fan Bai Jiang‑Bo Bai Jie Bao Ping Cao Qi‑Ping Chen Yong‑Hao Chen Zeng‑Qi Cui An‑Chuan Fan Fan‑Zhen Feng Min‑Hao Gu Chang‑cai Han Zi‑Jie Han Guo‑Zhu He Yong‑Cheng He yang Hong Yi‑Wei Hu Han‑Xiong Huang Wei Jiang Zhi‑Jie Jiang Zheng‑Yao Jin Ling Kang Bo Li Gong Li Xiao Li yang Li Jie Liu Rong Liu Shu‑Bin Liu Yi‑Na Liu Guang‑yuan Luan Jie Ren Zhi‑Zhou Ren Xi‑Chao Ruan Zhao‑Hui Song Kang Sun Zhi‑Xin Tan Sheng‑Da Tang Jin‑Cheng Wang Peng‑Cheng Wang Zhao‑Hui Wang Zhong‑Wei Wen Xiao‑Guang Wu Xuan Wu Cong Xia Yong‑Ji Yu Guo‑Hui Zhang Hang‑Chang Zhang Lin‑Hao Zhang Qi‑Wei Zhang Xian‑Peng Zhang Yu‑Liang Zhang Yue Zhang Zhi‑Yong Zhang Zhi‑Hao Zhou Ke‑Jun Zhu Chong Zou Institute of High Energy Physics Chinese Academy of Sciences(CAS)Beijing 100049China Spallation Neutron Source Science Center Dongguan 523803China State Key Laboratory of Particle detection and Electronics Institute of High Energy Physics Chinese Academy of SciencesBeijing 100049China dongguan Songshan Lake Future School Dongguan 523808China School of Nuclear Science and Technology University of Science and Technology of ChinaHefei 230027China State Key Laboratory of Particle detection and Electronics University of Science and Technology of ChinaHefei 230026China North Night Vision Science and Technology(Nanjing)Research Institute Co.Ltd Nanjing 211106China department of Modern Physics University of Science and Technology of ChinaHefei 230026China State Key Laboratory of Nuclear Physics and Technology School of PhysicsPeking UniversityBeijing 100871China Institute of Modern Physics Fudan UniversityShanghai 200433China Key Laboratory of Nuclear Data China Institute of Atomic EnergyBeijing 102413China China Academy of Engineering Physics Institute of Nuclear Physics and ChemistryMianyang 621900China USTC archaeometry lab University of Science and Technology of ChinaHefei 230026China Northwest Institute of Nuclear Technology Xi’an 710024China University of Chinese Academy of Sciences Beijing 100049China China Shipbuilding Trading Co. LtdBeijing 100044China

Neutron resonance imaging(NRI)has recently emerged as an appealing technique for neutron *** complexity surpasses that of conventional transmission imaging,as it requires a high demand for both a neutron source and ***,the progression of NRI technology has been sluggish since its inception in the 1980s,particularly considering the limited studies analyzing the neutron energy range above *** white neutron source(Back-n)at the China Spallation Neutron Source(CSNS)provides favorable beam conditions for the development of the NRI technique over a wide neutron energy range from eV to ***-sensitive microchannel plates(MCP)have emerged as a cutting-edge tool in the field of neutron detection owing to their high temporal and spatial resolutions,high detection efficiency,and low *** this study,we report the development of a 10B-doped MCP detector,along with its associated electronics,data processing system,and NRI experiments at the *** heavy elements such as gold,silver,tungsten,and indium can be easily identified in the transmission images by their characteristic resonance peaks in the 1–100 eV energy range;the more difficult medium-weight elements such as iron,copper,and aluminum with resonance peaks in the 1–100 keV energy range can also be *** particular,results in the neutron energy range of dozens of keV(Aluminum)are reported here for the first time.

关键词： Neutron resonance imaging 10B doped MCP detector White neutron source Sample nuclide identification

基于宏基因组学的中华绒螯蟹养殖池塘水体微生物群落结构和功能组成分析

在线全文

学校读者我要写书评

暂无评论

渔业科学进展 2024年第4期45卷 112-124页

作者：张旭周丽蔡敏崔娜欣庞思邹国燕赵志勇袁泉黄伟伟张亚雷上海市农业科学院生态环境保护研究所上海低碳农业工程技术研究中心上海201403 同济大学污染控制与资源化研究国家重点实验室上海200092 上海市农业科学院农产品质量标准与检测技术研究所上海201403

养殖水体中的微生物群落结构及功能组成对养殖生态系统具有重要作用。为了全面系统评估中华绒螯蟹(Eriocheirsinensis)养殖中后期水体微生物群落结构和功能组成,于2022年6―10月逐月监测上海市崇明区中华绒螯蟹养殖池塘内水质指标,同时... 详细信息

养殖水体中的微生物群落结构及功能组成对养殖生态系统具有重要作用。为了全面系统评估中华绒螯蟹(Eriocheirsinensis)养殖中后期水体微生物群落结构和功能组成,于2022年6―10月逐月监测上海市崇明区中华绒螯蟹养殖池塘内水质指标,同时基于宏基因组学技术分析了养殖期内水体中微生物物种组成及功能结构特征,并探讨了二者与环境因子的关系。结果显示,该养殖池塘在养殖中后期主要超标水质指标为p H、高锰酸盐指数、总磷和总氮。在养殖期水体中,6―8月的微生物群落多样性以及7―8月的微生物群落丰富度处于较高水平,优势门为细菌中的变形菌门(Proteobacteria)、拟杆菌门(Bacteroidetes)、放线菌门(Actinobacteria)、疣微菌门(Verrucomicrobia)、蓝细菌门(Cyanobacteria)和病毒中的尾噬菌体门(Uroviricota),而在属水平上,丰度占比前10的优势属在多组之间均存在显著差异,如7月蓝藻门微囊藻属(Microcystis)细菌和8―10月的有尾噬菌体目(unclassified_o_Caudovirales)病毒丰度明显高于其他月份。微生物的主要功能为代谢功能包括能量代谢、全局和概览图、氨基酸代谢等,不同月份的功能组成存在显著差异,尤其是6―7月代谢途径丰度明显高于8―10月,而优势细菌变形菌门、放线菌门和拟杆菌门是上述功能的主要贡献者。环境因子对微生物群落结构和功能组成的影响趋势一致,叶绿素a和pH是影响最显著的环境因子,溶解氧、总磷的影响作用稍弱。在养殖水体中,丰度占比较大的致病菌为肠道沙门氏菌(Salmonella enterica)、爱德华氏菌(Edwardsiella ictaluri)和金黄色葡萄球菌(Staphylococcus aureus)。研究结果可为中华绒螯蟹养殖池塘水体微生物群落结构和功能组成研究提供基础数据,并可为养殖水质调控及生态系统构建提供理论依据。

关键词：养殖塘中华绒螯蟹宏基因组学微生物群落功能环境因子

development of an ultrafast detector and demonstration of its oscillographic application

同方期刊数据库博看期刊评论

在线全文

学校读者我要写书评

暂无评论

Nuclear Science and Techniques 2022年第6期33卷 54-61页

作者： Hou-Zhi cai Qiu-Yan Luo kai-Xuan Lin dong Wang Jun-Kun Huang Jin-yuan Liu Key Laboratory of Optoelectronic devices and Systems of Ministry of Education and Guangdong Province College of Physics and Optoelectronic EngineeringShenzhen UniversityShenzhen 518060China

A dilation X-ray detector(DIXD)based on time dilation and microchannel plate(MCP)gated technology has been *** DIXD passes a driving pulse along the transmission photocathode(PC)to obtain a dilated electron signal and finally achieves a high time resolution of 12 ***,the waveform of the PC driving pulse can be obtained using the DIXD,and a DIXD oscillographic function can be *** experiment is presented to demonstrate the DIXD *** waveform of the PC driving pulse from points t_(1) to t_(12) is achieved by the *** waveform agrees well with that measured by a high-speed oscilloscope with a difference of less than 6%.The maximum theoretical bandwidth of the DIXD oscilloscope is theoretically *** bandwidth is limited by the potential difference between the PC and *** the potential difference is 3.4 kV,the theoretical limiting bandwidth is 1000 *** bandwidth increases with an increase in the potential difference.

关键词： Inertial confinement fusion Ultrafast diagnosis Dilation X-ray detector X-ray framing camera Microchannel plate

6个苇状羊茅(型)品种在成都平原区的生产性能评价

在线全文

学校读者我要写书评

暂无评论

草业学报 2024年第1期33卷 138-148页

作者：张睿韩重阳蔡家邦汪阳黄琳凯张新全聂刚四川农业大学草业科技学院四川成都611130 凉山彝族自治州林业草原科学研究院四川西昌615000

为筛选适宜成都平原推广利用的优异牧草品种,对6个苇状羊茅(型)品种进行了生育期、主要农艺性状、鲜(干)草产量及牧草营养成分等指标的测定,并运用灰色关联度分析进行综合评价。结果表明,‘特沃’和‘科瑞’的生育期最长,均达275 d。各... 详细信息

为筛选适宜成都平原推广利用的优异牧草品种,对6个苇状羊茅(型)品种进行了生育期、主要农艺性状、鲜(干)草产量及牧草营养成分等指标的测定,并运用灰色关联度分析进行综合评价。结果表明,‘特沃’和‘科瑞’的生育期最长,均达275 d。各参试品种平均再生速度依次为‘马胡丽娜’>‘科瑞’>‘都脉’>‘特沃’>‘K31’>‘福泰’。品种‘马胡丽娜’年平均干草产量最高,可达12790.99 kg·hm-2,分别较国审品种‘特沃’和‘都脉’显著增加14.62%和4.28%(P<0.05),表现出明显的产量优势。‘科瑞’干草产量较‘特沃’显著增加6.59%(P<0.05),且植株自然高度可达100.15 cm,高于‘特沃’和‘都脉’(P<0.05)。‘都脉’的分蘖数最大,为47.33个·株^(-1),显著高于其他品种(P<0.05),其次是‘科瑞’和‘马胡丽娜’,分别达37.50和37.00个·株^(-1),较品种‘特沃’多6.25和5.75个·株^(-1)。‘K31’茎叶比为0.96,高于其他参试品种。对6个参试品种的营养成分测定表明,‘特沃’的粗蛋白含量最高,可达18.60%,‘科瑞’的粗脂肪含量最高,可达5.41%。通过灰色关联度法综合比较分析,‘科瑞’表现最优,‘特沃’和‘马胡丽娜’综合性状表现较优,适宜在成都平原地区推广种植利用。

关键词：苇状羊茅牧草产量农艺性状营养成分灰色关联度分析

维普期刊数据库博看期刊

Initial Growth of Thin Films with Low Nucleus density and Linear Lateral Growth Rate on a Substrate Surface

在线全文

学校读者我要写书评

暂无评论

Chinese Physics Letters 2001年第8期18卷 1135-1137页

作者： SHAO Qing-Yi FANG Rong-Chuan ZHU kai-Gui LIAO yuan XUE Zeng-quan Structure Research Laboratory and department of Physics University of Science and Technology of ChinaHefei 230026 department of Electronics Peking UniversityBeijing 100871

Based on corrected rate equations,the kinetics is revealed for initial growth of thin films with low nucleus density and linear lateral growth rate on a substrate *** this case,the mobility and coalescence terms in rate equations are neglected,and the coverage term takes a dominant *** the calculated results are in agreement with experimental *** results introduce a new scaling in the case of dominant coverage,which is different from the those in the case of coalescence or mobility in a dominant role.

关键词： surface neglected kinetics

Hydralazine Promotes Central Nervous System Recovery after Spinal Cord Injury by Suppressing Oxidative Stress and Inflammation through Macrophage Regulation

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

当代医学科学(英文) 2023年第4期43卷 749-758页

作者： Xin quan Teng MA kai GUO Huan WANG cai-yong YU Chu-chu QI Bao-qiang SONG department of Plastic Surgery Xijing Hospitalthe Fourth Military Medical UniversityXi'an 710032China department of Orthopedics Xijing Hospitalthe Fourth Military Medical UniversityXi'an 710032China department of Burns and Cutaneous Surgery Xijing Hospitalthe Fourth Military Medical UniversityXi'an 710032China department of Respiratory Medicine Xi'an Hospital of Traditional MedicineXi'an 710000China department of Neurobiology School of Basic Medicinethe Fourth Military Medical UniversityXi'an 710032China

Objective:This study aims to investigate the effects of hydralazine on inflammation induced by spinal cord injury(SCI)in the central nervous system(CNS)and its mechanism in promoting the structural and functional recovery of the injured ***:A compressive SCI mouse model was utilized for this *** and quantitative real-time polymerase chain reaction were employed to examine the levels of acrolein,acrolein-induced inflammation-related factors,and macrophages at the injury site and within the *** blotting was used to evaluate the activity of the phosphoinositide 3-kinase(PI3K)/AKT pathway to study macrophage *** neuropathic pain and motor function recovery were evaluated by glutamic acid decarboxylase 65/67(GAD65/67),vesicular glutamate transporter 1(VGLUT1),paw withdrawal response,and Basso Mouse Scale *** staining and Luxol Fast Blue(LFB)staining were performed to investigate the structural recovery of the injured ***:Hydralazine downregulated the levels of acrolein,IL-1β,and TNF-αin the spinal *** downregulation of acrolein induced by hydralazine promoted the activation of the PI3K/AKT pathway,leading to M2 macrophage polarization,which protected neurons against SCI-induced ***,hydralazine promoted the structural recovery of the injured spinal cord *** inflammation and oxidative stress by hydralazine in the animal model alleviated neuropathic pain and altered neurotransmitter ***,hydralazine facilitated motor function recovery following *** staining and LFB staining indicated that hydralazine promoted the structural recovery of the injured ***:Hydralazine,an acrolein scavenger,significantly mitigated SCI-induced inflammation and oxidative stress in vivo,modulated macrophage activation,and consequently promoted the structural and functional recovery of the injured CNS.

关键词： spinal cord injury proinflammation oxidative stress macrophage acrolein scavenger

2型糖尿病合并终末期肾病患者同期胰肾联合移植术后危险因素:UNOS数据库50230例分析

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

解放军医学杂志 2024年第4期49卷 371-379页

作者：夏新泽赖文辉黄帅安哲昆郝晓伟吕凯凯罗振君袁清蔡明山西医科大学第二临床医学院山西太原030001 解放军总医院第三医学中心泌尿外科医学部北京100039 浙江大学医学院附属第二医院泌尿外科浙江杭州310009

目的比较2型糖尿病(T2DM)合并终末期肾病(ESRD)患者行同期胰肾联合移植(SPKT)或尸体肾移植(DDKT)后的移植肾及患者生存情况,并分析SPKT术后影响患者存活的危险因素。方法获取美国器官资源共享网络(UNOS)数据库中2003年1月27日-2021年1月... 详细信息

目的比较2型糖尿病(T2DM)合并终末期肾病(ESRD)患者行同期胰肾联合移植(SPKT)或尸体肾移植(DDKT)后的移植肾及患者生存情况,并分析SPKT术后影响患者存活的危险因素。方法获取美国器官资源共享网络(UNOS)数据库中2003年1月27日-2021年1月1日接受肾脏移植患者的临床及预后资料。根据纳入、排除标准最终纳入50230例,其中DDKT组48669例,SPKT组1561例。采用Kaplan-Meier法比较两组受者的移植肾及患者存活情况,并通过倾向性评分匹配(PSM)均衡组间混杂因素。采用Cox回归模型分析SPKT术后影响患者生存的独立危险因素。结果与DDKT组比较,SPKT组受者的中位年龄小(P<0.001)、男性占比高(P<0.001)、BMI低(P<0.001)、透析时间和移植等待时间短(P<0.001)、私人医保占比高(P<0.001)、既往移植占比低(P<0.001)、糖尿病确诊年龄低(P<0.001)、外周血管病史少(P=0.033);与DDKT组比较,SPKT组供者的中位年龄小(P<0.001)、男性占比高(P<0.001)、BMI低(P<0.001)、高血压病史和糖尿病史少见(P<0.001);在移植相关因素上,与DDKT组比较,SPKT组的供肾冷缺血时间短(P<0.001)、HLA错配程度高(P<0.001)、KDPI低(P<0.001)。与DDKT组比较,SPKT组出院时血肌酐水平低(P<0.001)、术后移植肾功能恢复延迟(DGF)发生率和AR发生率低(P<0.001),住院时间长(P<0.001)。原始和PSM后的Kaplan-Meier生存分析曲线均显示SPKT组的移植肾和患者存活率明显高于DDKT组(P<0.001)。Cox回归模型分析显示,受者年龄、受者种族、供者年龄和供肾冷缺血时间是影响SPKT术后患者存活的独立危险因素(P<0.05)。结论T2DM合并ESRD患者行SPKT较DDKT的远期移植肾和患者存活率高。受者年龄、受者种族、供者年龄和供肾冷缺血时间是影响SPKT术后患者存活的独立危险因素。

关键词：肾移植同期胰肾联合移植倾向性评分匹配生存分析预后因素

在线全文

学校读者我要写书评

暂无评论

顶升平移机的设计及应用

山东工业技术 2024年第4期 48-54页

作者：周玲汤晨铠蔡宁远南京工业职业技术大学机械工程学院江苏南京210013 无锡先导智能装备股份有限公司江苏无锡214000 南京高华科技股份有限股份江苏南京210046

当前,在需求多变品种多样化成本至上的背景下,厂商对生产流水线的工艺优化需求不断增加。一个典型问题是:在生产车间占地面积不变的前提下,是否能在有限的空间内尽可能的开辟生产线。即对旧生产线进行局部改造来填补新需求,而不是整体... 详细信息

当前,在需求多变品种多样化成本至上的背景下,厂商对生产流水线的工艺优化需求不断增加。一个典型问题是:在生产车间占地面积不变的前提下,是否能在有限的空间内尽可能的开辟生产线。即对旧生产线进行局部改造来填补新需求,而不是整体重建生产线。这样一来老线与新线间的衔接成为了一个重要技术难点。本文中顶升平移机就是将产品从一条生产线转移到另一个生产线上的设备。该设备主要运动特点是提升和平移能力,提升能力主要由气缸和连杆机构来实现,而平移能力主要由电机和链传输来保证。顶升平移机可分拣的产品尺寸范围广,且相对较适合中大型箱体产品。其输送速度快且安全性较高;生产效率较高,可明显降低生产管理和配套设施的成本、以及工人的劳动强度。顶升平移机提供了一种不同箱体混合生产的新思路,形态各异的箱体产品可在一条生产线上按照同零件原则进行同一组装,最后通过顶升平移单元完成异类箱体的分拣。

关键词：顶升平移机设计生产线分拣

Endovenous laser ablation of great saphenous vein with ultrasound-guided perivenous tumescence： early and midterm results

在线全文

学校读者我要写书评

暂无评论

Chinese Medical Journal 2013年第3期126卷 421-425页

作者： CHEN Jia-quan XIE Hui deNG Hao-yu yuan kai ZHANG Ji-wei ZHANG Hao ZHANG Lan department of Vascular Surgery Renji Hospital School of Medicine Shanghai Jiao Tong University Shanghai 200127 China

Background Endovenous laser ablation （EVLA） is an improved method to treat varicose great saphenous veins （GSV） with a high satisfactory rate. This study aimed to evaluate the efficiency and safety of treatment by EVLA procedures with ultrasound-guided perivenous tumescence. Methods Thirty-one patients （31 limbs） with symptomatic varicose vein primary to chronic venous insufficiency （CVI） treated with EVLA were prospectively studied. The entire procedure was performed under ultrasound-guided tumescent local anesthesia. The patients were evaluated with a 18 month follow-up postoperation using clinical examination and venous duplex ultrasonography. Pain scores and quality of life （QOL） were recorded using visual analog scale （VAS） and the chronic venous insufficiency questionnaire （CIVIQ） at 1 week, 1 month, and 12 months after operation. Results All patients tolerated EVLA procedure well. The overall success occlusion rates of GSV were 92%, 94%, and 94% at 1, 12, and 18 months follow-up, respectively. The score of CIVIQ one week preoperation was 69.14±11.44 while that of CIVIQ one month postoperation was 85.32±4.89. The life quality has significantly improved after the operation of EVLA （t=12.71, P 〈0.05）. The VAS one month after treatment was lower than 1 week before therapy （t=8.048, P 〈0.05）. Major complications such as deep vein thrombosis and skin burns were not found. Most of the complications were minor and improved quickly. Conclusions This refinement type of EVLA procedure is a safe and effective treatment with a high satisfaction rate; it displayed noteworthy features including shortening hospitalization, early ambulant activity, and preferable occlusion rates.

关键词： endovenous laser ablation great saphenous vein occlusion tumescent anaesthesia