检索结果-南通市图书馆

Optical manipulation of the topological phase in ZrTe_(5) revealed by time-and angle-resolved photoemission

在线全文

学校读者我要写书评

暂无评论

Chinese Physics B 2024年第1期33卷 170-175页

作者：黄超之徐骋洋朱锋锋段绍峰刘见喆顾凌霄王石崇刘浩然钱冬罗卫东张文涛 Key Laboratory of Artificial Structures and Quantum Control School of Physics and AstronomyShanghai Jiao Tong UniversityShanghai 200240China Collaborative Innovation Center of Advanced Microstructures Nanjing UniversityNanjing 210093China Tsung-Dao Lee Institute Shanghai Jiao Tong UniversityShanghai 200240China

High-resolution time-and angle-resolved photoemission measurements were conducted on the topological insulator ZrTe_(5).With strong femtosecond photoexcitation,a possible ultrafast phase transition from a weak to a strong topological insulating phase was experimentally realized by recovering the energy gap inversion in a time scale that was shorter than 0.15 *** photoinduced transient strong topological phase can last longer than 2 ps at the highest excitation fluence studied,and it cannot be attributed to the photoinduced heating of electrons or modification of the conduction band ***,the measured unoccupied electronic states are consistent with the first-principles calculation based on experimental crystal lattice constants,which favor a strong topological insulating *** findings provide new insights into the longstanding controversy about the strong and weak topological properties in ZrTe_(5),and they suggest that many-body effects including electron–electron interactions must be taken into account to understand the equilibrium weak topological insulating phase in ZrTe_(5).

关键词： time-and angle-resolved photoemission spectroscopy electronic structure topological insulator

Vertical distribution and temporal evolution of formaldehyde and glyoxal derived from MAX-DOAS observations:The indicative role of VOC sources

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2022年第12期34卷 92-104页

作者： Qianqian Hong Cheng liu Qihou Hu Yanli Zhang Chengzhi Xing Jinping Ou Wei Tan haoran liu Xiaoqing Huang Zhenfeng Wu School of Environment and Civil Engineering Jiangnan UniversityWuxi 214122China Center for Excellence in Regional Atmospheric Environment Institute of Urban EnvironmentChinese Academy of SciencesXiamen 361021China Key Lab of Environmental Optics&Technology Anhui Institute of Optics and Fine MechanicsHefei Institutes of Physical ScienceChinese Academy of SciencesHefei 230031China Department of Precision Machinery and Precision Instrumentation University of Science and Technology of ChinaHefei 230026China Anhui Province Key Laboratory of Polar Environment and Global Change University of Science and Technology of ChinaHefei 230026China Guangdong Key Laboratory of Environmental Protection and Resources Utilization State Key Laboratory of Organic GeochemistryGuangzhou Institute of GeochemistryChinese Academy of SciencesGuangzhou 510640China Guangdong-Hongkong-Macao Joint Laboratory of Collaborative Innovation for Environmental Quality Guangzhou 510632China Institute of Physical Science and Information Technology Anhui UniversityHefei 230601China

Formaldehyde(HCHO)and glyoxal(CHOCHO)are important oxidization intermediates of most volatile organic compounds(VOCs),but their vertical evolution in urban areas is not well *** profiles of HCHO,CHOCHO,and nitrogen dioxide(NO_(2))were retrieved from ground-based Multi-Axis Differential Optical Absorption Spectroscopy(MAXDOAS)observations in Hefei,*** and CHOCHO vertical profiles prefer to occur at higher altitudes compared to NO_(2),which might be caused by the photochemistry-oxidation of longer-lived VOCs at higher *** means of HCHO concentrations were higher in summer,while enhanced amounts of NO_(2)were mainly observed in *** exhibited a hump-like seasonal variation,with higher monthly-averaged values not only occurred in warm months(July-August)but also in cold months(November-December).Peak values mainly occurred during noon for HCHO but emerged in the morning for CHOCHO and NO_(2),suggesting that HCHO is stronger link to photochemistry than *** further use the glyoxal to formaldehyde ratio(GFR)to investigate the VOC sources at different *** lowest GFR value is almost found in the altitude from 0.2 to 0.4 km,and then rises rapidly as the altitude *** GFR results indicate that the largest contributor of the precursor VOC is biogenic VOCs at lower altitudes,while at higher altitudes is anthropogenic *** findings provide a lot more insight into VOC sources at vertical direction,but more verification is recommended to be done in the future.

关键词： Formaldehyde Glyoxal MAX-DOAS Vertical distribution VOC

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

古代医家对疫病致病因素的类述

中医临床研究 2024年第12期16卷 33-37页

作者：陈谦峰刘浩然吉瑞蔡华珠江西中医药大学江西南昌330004 福建中医药大学福建福州350122

疫病在给人类造成严重负面影响的同时,也促进了医学的发展。纵观中医发展史,从《黄帝内经》的“百病生于气”“三年化疫”,到《伤寒杂病论》对寒疫的详实记载,再到《温疫论》的“杂气”致疫,各时代对疫病致病因素的认识在逐步加深。几... 详细信息

疫病在给人类造成严重负面影响的同时,也促进了医学的发展。纵观中医发展史,从《黄帝内经》的“百病生于气”“三年化疫”,到《伤寒杂病论》对寒疫的详实记载,再到《温疫论》的“杂气”致疫,各时代对疫病致病因素的认识在逐步加深。几千年来,中医在疫病的防治实践中积累了丰富的经验,形成成熟理论,留下的大量著作,是世界其他任何民族无法相比的。基于此,文章探讨了古代医家对疫病致病因素的理解和认识,首先,阐述疫病的概念和特征,并引用了多个历史文献中的记载来证明疫病具有强烈的传染性和流行性。其次,阐述古代医家关于疫病致病因素的六种观点:六气致疫、伏气致疫、杂气致疫、毒气致疫、虫邪致疫、温邪致疫。在六气致疫中,古代医家详细讨论了寒、火、燥、湿四种致病因素的作用机制。对于伏气致疫的观点,列举了几种不同的病邪伏藏在人体内的位置和发作条件,如伏寒藏于骨髓、肾,伏寒藏于肌肤等,以及热伏于经、血秽伏于命门、热毒伏于气血、胎毒伏于脾肺、疫气伏于膜原以及温毒遇温伏发等多种致病因素。并且,古代医家在阐述各种致疫因素的具体表现的同时,还提供了相应的治疗方法。明确病因是中医辨证论治的基础,横向挖掘疫病致病因素能更好地传承中医疫病理论精华,以期启发现代传染病的防控。文章为了解古代医家对疫病致病因素的理解和分类提供了一个全新的视角,对于理解和预防疫病具有重要的参考价值。

关键词：古代疫病致病因素类述

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

中试产业化的理论逻辑、实践困境及优化策略

西部经济管理论坛 2024年第3期35卷 19-30页

作者：杜云晗吴跃刘浩然何文军西南财经大学人口与发展数据实验室四川成都611130 四川省人力资源和社会保障厅科学研究所四川成都610015 西南财经大学中国西部经济研究院四川成都611731 西华大学管理学院四川成都610039 西华大学现代农业装备研究院四川成都610039

加快中试产业化发展,建设现代化中试产业体系,有助于加快我国科技成果的形成与转化,促进创新链与产业链深度融合发展,加快实现高水平科技成果产业化发展。我国中试具备产业化的可能性与必要性,中试产业化的有效运行依赖于规范的内部管... 详细信息

加快中试产业化发展,建设现代化中试产业体系,有助于加快我国科技成果的形成与转化,促进创新链与产业链深度融合发展,加快实现高水平科技成果产业化发展。我国中试具备产业化的可能性与必要性,中试产业化的有效运行依赖于规范的内部管理机制、良性的外部协作机制和有效的政府宏观调控机制。目前中试产业化面临的现实困境是创新主体与生产主体信息沟通不畅、存在知识泄露和人才流失风险、创新主体积极性不高、市场定位不清晰、监管制度不完善等问题,需在中试信息流通、技术服务保护、人才评聘和收益分配机制、专业化市场建设和监管制度改革等方面持续优化完善。

关键词：中试产业化科技成果制造业现实困境

Multi-scale fractures formation and distribution in tight sandstones—a case study of Triassic Chang 8 Member in the southwestern Ordos Basin

在线全文

学校读者我要写书评

暂无评论

Frontiers of Earth Science 2022年第2期16卷 483-498页

作者： Gaojian XIAO Ling HU Yang LUO Yujing MENG Ali Bassam Taher AL-SALAFI haoran liu Key Laboratory of Tectonics and Petroleum Resources China University of GeosciencesWuhan 430074China Wenhua College Wuhan 430074China Faculty of Petroleum and Natural Resources Sana’a UniversitySana’aYemen Louisiana State University Baton Rouge LA 7080USA

Fracture system is an important factor controlling tight oil accumulation in the Triassic Chang 8 Member,southwestern Ordos Basin,China.A systematic characterization of the multi-scale natural fractures is a basis for the efficient tight oil *** on outcrops,seismic reflections,well cores,well logs(image and conventional logging),casting thin sections,and scanning electron microscope observation,the multi-scale fractures occurrences and their influences on Chang 8 tight sandstone reservoirs are *** results show that three periods of strike-slip faults and four scales of natural fractures developed,namely mega-scale(length>7×10^(7) mm),macro-scale(3.5×10^(5)

关键词： natural fractures characteristics geological significance tight sandstone reservoir Upper Triassic Yanchang Formation

A novel cartridge for nucleic acid extraction,amplification and detection of infectious disease pathogens with the help of magnetic nanoparticles

在线全文

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8期34卷 236-240页

作者： Yile Fang Yue Wang Liangxi Zhu haoran liu Xiangyi Su Yuan liu Zhu Chen Hui Chen Nongyue He State Key Laboratory of Bioelectronics School of Biological Science and Medical EngineeringSoutheast UniversityNanjing 210096China Economical Forest Cultivation and Utilization of 2011 Collaborative Innovation Center in Hunan Province Hunan Key Laboratory of Green Chemistry and Application of Biological NanotechnologyHunan University of TechnologyZhuzhou 412007China

Nucleic acid detection(NAD)based on real-time polymerase chain reaction(real-time PCR)is gold standard for infectious disease *** nanoparticles(MNPs)are widely used for nucleic acid extraction(NAE)because of their excellent *** technology makes automated NAD ***,most of the NAD microfluidic chips are too complex to be applied to point-of-care(POC)*** this paper,a simple-structure cartridge was developed for POC detection of infectious *** self-contained cartridge can be divided into a magnetic-controlled NAE part,a valve-piston combined fluidic control part and a PCR chip,which is able to extract nucleic acid from up to 500μL of liquid samples by MNPs and finish the detection process from“sample in”to“answer out”*** tests of the cartridges show that it met the demands of automated *** of on-cartridge detection of hepatitis B virus(HBV)demonstrated that this system has good uniformity and no cross-contamination between different cartridges,and the limit of detection(LOD)of this system for HBV in serum is 50 IU/*** detections of severe acute respiratory syndrome coronaviruses 2(SARS-CoV-2)with a concentration of 500 copies/mL were carried out on the system and 100%positive detection rate was achieved.

关键词： Nucleic acid detection Cartridge Magnetic nanoparticles Fluidic control Point-of-care testing

黄河流域长孝岩溶水系统水文地质特征及蓄水模式分析

在线全文

学校读者我要写书评

暂无评论

山东国土资源 2024年第3期40卷 116-127页

作者：张文强滕跃许庆宇刘小天柳浩然张海林山东省地质矿产勘查开发局八〇一水文地质工程地质大队山东省地下水环境保护与修复工程技术研究中心山东济南250014

基于在黄河流域长孝岩溶水系统开展的1∶5万水文地质调查工作,系统总结了该水文地质单元的边界条件、含水岩组分布及富水性空间分布特征,分析了区内地下水补给、径流、排泄条件与地下水动态变化特征,探讨了黄河长孝单元与周边地下水的... 详细信息

基于在黄河流域长孝岩溶水系统开展的1∶5万水文地质调查工作,系统总结了该水文地质单元的边界条件、含水岩组分布及富水性空间分布特征,分析了区内地下水补给、径流、排泄条件与地下水动态变化特征,探讨了黄河长孝单元与周边地下水的相互作用。黄河向北侧补给孔隙水,向南侧补给孔隙水及岩溶水,其中对孔隙水侧渗补给带范围至王营村—庞道口—太平庄—姚河门村一带,对岩溶水补给主要发生在望口山村至柳河圈村一带、孝里镇胜利村附近。圈定了以朱砂洞组为含水岩组的双泉镇段店村裂隙岩溶水富水地段、以三山子组马家沟群为含水岩组的归德孝里马集裂隙岩溶水富水地段,分析其富水机理,总结了层间岩溶断层阻水型及单斜断裂型两种基岩蓄水构造模式,可为该区域找水定井提供参考。

关键词：长孝岩溶水系统地下水动态特征蓄水模式黄河流域

维普期刊数据库博看期刊

在线全文

学校读者我要写书评

暂无评论

帕罗西汀对伴抑郁的肿瘤患者的效果

国际精神病学杂志 2024年第1期51卷 249-252页

作者：柳浩然王建华李甲王鑫王锦辉唐山市人民医院唐山063000

目的探讨肿瘤合并抑郁患者应用帕罗西汀治疗对其心理情绪、精神状态的影响。方法于2022年3月~2023年3月采集病例资料入档,对象为收治的肿瘤合并抑郁患者,共计纳入96例,纳入对象基于“随机数字表法”分组,划分为对照组与观察组,分别予以... 详细信息

目的探讨肿瘤合并抑郁患者应用帕罗西汀治疗对其心理情绪、精神状态的影响。方法于2022年3月~2023年3月采集病例资料入档,对象为收治的肿瘤合并抑郁患者,共计纳入96例,纳入对象基于“随机数字表法”分组,划分为对照组与观察组,分别予以阿米替林与帕罗西汀治疗,各组48例;观察对比两组抑郁程度、精神状态、睡眠质量、生存质量、不良反应发生率。结果治疗后,两组焦虑自评量表(Self-Rating Anxiety Scale,SAS)评分、抑郁自评量表(Self-rating depression scale,SDS)评分均有不同程度降幅,且观察组降幅较对照组大(P0.05)。结论肿瘤合并抑郁患者应用帕罗西汀治疗,可有效改善患者抑郁状态,提高睡眠质量,取得良好预后。

关键词：帕罗西汀肿瘤患者抑郁症临床效果

Exploring the impact of new particle formation events on PM_(2.5) pollution during winter in the Yangtze River Delta,China

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2022年第1期34卷 75-83页

作者： Jinping Ou Qihou Hu haoran liu Shiqi Xu Zhuang Wang Xiangguang Ji Xinqi Wang Zhouqing Xie Hui Kang Institute of Physical Science and Information Technology Anhui UniversityHefei 230601China Key Lab of Environmental Optics and Technology Anhui Institute of Optics and Fine MechanicsHefei Institutes of Physical ScienceChinese Academy of SciencesHefei 230031China School of Earth and Space Sciences University of Science and Technology of ChinaHefei 230026China School of Environmental Science and Optoelectronic Technology University of Science and Technology of ChinaHefei 230026China Center for Excellence in Regional Atmospheric Environment Institute of Urban EnvironmentChinese Academy of SciencesXiamen 361021China Institute of Polar Environment&Anhui Province Key Laboratory of Polar Environment and Global Change Department of Environment Science and TechnologyUniversity of Science and Technology of ChinaHefei 230026China

New particle formation(NPF)events are an increasingly interesting topic in air quality and climate *** this study,the particle number size distributions,and the frequency of NPF events over Hefei were investigated from November 2018 to February *** proportions of the nucleation mode,Aitken mode,and accumulation mode were 24.59%,53.10%,and 22.30%,respectively,which indicates the presence of abundant ultrafine particles in ***-six NPF events occurred during the observation days,accounting for 41.82%of the entire observation ***,the favorable meteorological conditions,potential precursor gases,and PM_(2.5)range of the NPF events were *** to non-NPF days,the NPF events preferentially occurred on days with lower relative humidity,higher wind speeds,and higher *** the PM_(2.5) was 15–20,70–80,and105–115μg/m^(3),the frequency of the NPF events was *** mode particles were positively related to atmospheric oxidation indicated by ozone when PM_(2.5) ranged from 15 to 20μg/m^(3),and related to gaseous precursors like SO_(2) and NO_(2) when PM_(2.5)was located at 70-80 and 105–115μg/m^(3).On pollution days,NPF events did not directly contribute to the increase in the PM_(2.5) in the daytime,however,NPF events would occur during the night and the growth of particulate matter contributes to the nighttime PM_(2.5) *** could lead to pollution that lasted into the next *** findings are significant to the improvement of our understanding of the effects of aerosols on air quality.

关键词： New particle formation Aerosols PM_(2.5) Hefei Meteorological conditions