检索结果-南通市图书馆

Surface molecular doping of all-inorganic perovskite using zethrenes molecules

Nano Research 2019年第1期12卷 77-84页

作者： Arramel Hu Pan Aozhen Xie Songyan Hou Xinmao Yin Chi Sin Tang Nguyen T.Hoa Muhammad D.Birowosuto Hong Wang cuong Dang Andrivo Rusydi Andrew T.S.Wee Jishan Wu Department of Physics National University of Singapore2 Science Drive 3Singapore 117542Singapore Centre for Advanced 2D Materials National University of SingaporeBlock S14Level 66 Science Drive 2Singapore 117546Singapore Department of Chemistry National University of Singapore3 Science Drive 3Singapore 117543Singapore CINTRA UMICNRS/NTU/THAleS 3288 Research Techno Plaza50 Nanyang DriveLevel 6Border X BlockSingapore 637553Singapore School of Electrical and Electronic Engineering Nanyang Technological University50 Nanyang AvenueSingapore 639798Singapore Energy Research Institute@NTU(ERI@N) Nanyang Technological UniversityResearch Techno PlazaX-Frontier BlockLevel 550 Nanyang DriveSingapore 637553Singapore Singapore Synchrotron Light Source National University of Singapore5 Research LinkSingapore 1176033Singapore NUS Graduate School for Integrative Sciences and Engineering(NGS) National University of SingaporeSingapore 117456Singapore NUSNNI-NanoCore National University of SingaporeSingapore 117411Singapore Institute of Materials Research&Engineering(IMRE) Agency far ScienceTechnology and Research(A^*STAR)2 Fusionopolis WayInnovisSingapore 138634Singapore

We present an optical and photoelectron spectroscopic study to elucidate the interfacial electronic properties of organic-inorganic semiconductor heterojunctions formed in a kinetically blocked heptazethrene triisopropylsilyl ethynylene (HZ-TIPS) and its homologue,octazethrene (OZ-TIPS) on an all-inorganic perovskite cesium lead bromide (CsPbBr3) *** photoluminescence behavior of the underlying perovskites upon differing molecular doping conditions was *** turns out that the charge transfer dynamics of thermally-evaporated OZ-TIPS molecule exhibited a faster average lifetime than that of the HZ-TIPS case suggesting the importance of the biradical state in the former *** interfacial dipole was formed at the interface due to the competing interaction between the dispersion force of the bulky TIPS-substituent group and the attractive van der Waals interaction at the first few *** spectroscopy of the physisorbed HZ-TIPS shows chemical shifts,which indicates electron transfer from HZ-TIPS molecules to the CsPbBr3 perovskite single *** contrast,the adsorbed OZ-TIPS molecular layer on CsPbBr3 demonstrates the opposite trend indicating a hole transfer *** average molecular orientation as determined by near edge X-ray absorption fine structure (NEXAFS) suggests that the HZ-TIPS molecular plane is generally lifted with respect to the perovskite *** suggest that the nature of the closed-shell electronic ground state of HZ-TIPS could contribute to the formation of interfacial dipole at the molecule/perovskite interface.

关键词： zethrene photoelectron spectroscopy perovskite near edge X-ray absorption fine structure and molecular doping

来源：

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

Influence of CeO2 on Properties and Activity of Oxide Catalysts in Carbon Monoxide Oxidation

引用

Journal of Chemistry and Chemical Engineering 2010年第2期4卷 48-55页

作者： Hoang Tien cuong Luu Cam Loc Ho Si Thoang Institute of Chemical Technology Vietnam Academy of Science and Technology 1 Mac Dinh Chi Str. Ho Chi Minh City 70100Vietnam

A series of catalysts on the basis of 10 wt.% CuO/y-AI203, 10 wt.% CuO ＋ 10 wt.% Cr2O3/y-AI203 and 15 wt.% MnO2/y -A1203 have been prepared and modified by CeO2 with contents up to 20 wt.%. Physico-chemical properties of the catalysts were determined by the methods of BET Adsorption, XRD, and TPR. Oxidative activity of the catalysts was studied at the temperature range 90-220 ℃and CO concentration of 3 mol.%. Addition of CeO2 led to changes in physico-chemical properties of the catalysts and formation of novel active centres that increased the activity of CuO and Cr203 containing catalysts, but decreased the activity of those, containing MnO2. The catalyst sample containing 10 wt.% CuO and 15 wt.% CeO2 has been shown to be the best one for complete conversion of CO. At the given conditions on this catalyst the complete oxidation of CO to CO2 occurred at 130 ~C during more than 500 h.

关键词： CeO2 carbon monoxide oxide catalysts oxidation.

来源：

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

Surface-enhanced Raman scattering nanosensors for in vivo detection of nucleic acid targets in a large animal model

引用

Nano Research 2018年第8期11卷 4005-4016页

作者： Hsin-Neng Wang Janna K. Register Andrew M. Fales Naveen Gandra Eugenia H. Cho Alina Boico Gregory M. Palmer Bruce Klitzman Tuan Vo-dinh Departments of Biomedical Engineering Duke University Durham NC27708 USA Fitzpatrick Institute for Photonics Duke University Durham NC27708 USA Medical Center Duke University Durham NC27710 USA Deportments of Chemistry Duke University Durham NC27708 USA Hsin-Neng Wang Janna K. Register and Andrew M. Fales contributed equally to this work.

Although nanotechnology has led to important advances in in vitro diagnostics, the development of nanosensors for in vivo detection remains very challenging. Here, we demonstrated the proof-of-principle of in vivo detection of nudeic acid targets using a promising type of surface-enhanced Raman scattering （SERS） nanosensor implanted in the skin of a large animal model （pig）. The in vivo nanosensor used in this study involves the ＂inverse molecular sentinel＂ detection scheme using plasmonics-active nanostars, which have tunable absorption bands in the near infrared region of the ＂tissue optical window＂, rendering them efficient as an optical sensing platform for in vivo optical detection. Ex vivo measurements were also performed using human skin grafts to demonstrate the detection of SERS nanosensors through tissue. In this stud, a new core--shell nanorattle probe with Raman reporters trapped between the core and shell was utilized as an internal standard system for self-calibration. These results illustrate the usefulness and translational potential of the SERS nanosensor for in vivo biosensing.

关键词： nanosensor nanoprobes plasmonics nanostar surface-enhanced Ramanscattering (SERS) in vivo sensing

来源：

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

Hypergeometric Functions: From One Scalar Variable to Several Matrix Arguments, in Statistics and Beyond

引用

Open Journal of Statistics 2016年第5期6卷 951-994页

作者： T. Pham-Gia dinh Ngoc Thanh Department of Mathematics and Statistics Université de Moncton Moncton Canada The Applied Multivariate Research Group Université de Moncton Moncton Canada Department of Mathematics and Computer Science University of Science Vietnam National University Ho Chi Minh City Vietnam

Hypergeometric functions have been increasingly present in several disciplines including Statistics, but there is much confusion on their proper uses, as well as on their existence and domain of definition. In this article, we try to clarify several points and give a general overview of the topic, going from the univariate case to the matrix case, in one and then in several arguments. We also survey some results in fields close to Statistics, where hypergeometric functions are actively used, studied and developed.

关键词： Hypergeometric Zonal Polynomial Fractional Calculus Lie Group Cohomology Computation

来源：

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

Microwave Synthesis of Large Few-Layer Graphene Sheets in Aqueous Solution of Ammonia

引用

Nano Research 2010年第2期3卷 126-137页

作者： Izabela Janowska Kambiz Chizari Ovidiu Ersen Spyridon Zafeiratos Driss Soubane Victor Da Costa Virginie Speisser Christine Boeglin Matthieu Houllé Dominique Bégin Dominique Plee Marc-Jacques ledoux cuong Pham-Huu Laboratoire des Matériaux Surfaces et Procédés pour la Catalyse(LMSPC)UMR7515 CNRS-Universitéde Strasbourg 25rue Becquerel67087 Strasbourg Cedex 08France Institut de Physique et Chimie des Matériaux de Strasbourg(IPCMS) UMR7504 CNRS-Universitéde Strasbourg 23rue du Loess67037 Strasbourg Cedex 02France Arkema Groupement de Recherche de Lacq(GRL)BP 3464170 LACQFrance

Few-layer graphene (FLG) sheets with sizes exceeding several micrometers have been synthesized by exfoliation of expanded graphite in aqueous solution of ammonia under microwave irradiation, with an overall yield approaching 8 wt.%. Transmission electron microscopy (in bright-field and dark-field modes) together with electron diffraction patterns and atomic force microscopy confirmed that this graphene material consisted mostly of mono-, bi- or few-layer graphene (less than ten layers). The high degree of surface reduction was confirmed by X-ray photoelectron and infrared spectroscopies. In addition, the high stability of the FLG in the liquid medium facilitates the deposition of the graphene material onto several substrates via low-cost solution-phase processing techniques, opening the way to subsequent applications of the material.

关键词： Graphene transmission electron microscopy(TEM) expanded graphite exfoliation microwaves

来源：

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

“翻转课堂”在高职工科类专业教学中的可行性研究

引用

黑龙江畜牧兽医（下半月） 2016年第7期 231-233页

作者：刘琼史诺杨鹏 Tran Van cuong 杨凌职业技术学院信息工程分院陕西杨凌712100 杨凌职业技术学院机电工程分院陕西杨凌712100 西北农林科技大学机械与电子工程学院陕西杨凌712100 一号越俄职业技术学院越南283400

"翻转课堂"充分发挥了教师的主导作用和学生的主体作用,是目前教育教学的研究热点。高职教育对"翻转课堂"的教学模式尚处于观望状态,还没有具体成熟的应用案例。笔者从微课视频、支撑环境、教学活动三方面出发,结合高职工科类专业教学... 详细信息

"翻转课堂"充分发挥了教师的主导作用和学生的主体作用,是目前教育教学的研究热点。高职教育对"翻转课堂"的教学模式尚处于观望状态,还没有具体成熟的应用案例。笔者从微课视频、支撑环境、教学活动三方面出发,结合高职工科类专业教学的特点,分析实施"翻转课堂"的可行性,根据分析结果建立项目式"翻转课堂"的结构模型并开展实验,旨在探讨高职教学的新思路,促进教学效果的提升。

关键词：翻转课堂高职工科微课视频支撑环境教学活动教学模式可行性

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

《海洋法公约》在越南的实施研究

《海洋法公约》在越南的实施研究

引用

作者： VUONG dinh VUONG 武汉大学

学位级别：硕士

近年来,由于海洋蕴藏的丰富资源慢慢被发现及其在地缘战略中的重要地位导致来自海洋的冲突越来越复杂。同时,各国政府越来越关注海洋权利,并利用海洋作为走出去并融合到国际市场的主要途径之一。因此,无论是从维护越南国家利益,还是从... 详细信息

近年来,由于海洋蕴藏的丰富资源慢慢被发现及其在地缘战略中的重要地位导致来自海洋的冲突越来越复杂。同时,各国政府越来越关注海洋权利,并利用海洋作为走出去并融合到国际市场的主要途径之一。因此,无论是从维护越南国家利益,还是从国际社会以及东南亚地区的合作与安全角度来看,合理及有效地实施《海洋法公约》也已成为越南政府的重要政治任务和政治手段之一。回顾二十多年来《公约》在越南的实施历程,虽然越南在发展政府海洋管理领域取得不少成就,但仍然存在着很多漏洞和不足。因此,笔者认为应重新思考越南政府与《公约》的关系以及结合目前国际形势的演变和发展走势,重新研究并有效运用《公约》的相关制度,以尽量减轻或避免各种不利影响。同时,以《公约》规定作为依据与实际相结合,推动越南在对待“区域”内海洋资源归属及其国内立法倡议这个崭新的问题上作出正确的抉择。本文主要分一下四部分:第一章论主要回顾越南政府参与《海洋法公约》的过程,简略介绍了越南签署《公约》的意义,论述越南签署《海洋法公约》的缘故。第二章主要分析1977年的《关于领海、毗连区、专属经济区以及大陆架的政府公告》与《海洋法公约》的联系以及对越南行使海洋权益的影响,主要以1977年公告的内容和根据《公约》相关规定做一个比较。另外,也将越南1982年的《用于测算领海宽度的基线方法的政府公告》与《海洋法公约》进行比较,再把1994年《海洋法公约》正式生效到越南海洋法成立和颁布之前作为主要发展阶段之一进行研究,指出越南海洋管理执法过程中的成就以及主要发展趋势,最后阐释2012年《越南海洋法》以及其他越南国内海洋政策。第三章首先是从越南国内分析《海洋法公约》在越南实施困境:第一是越南国内民众对《公约》的认识模糊、第二是与相邻国的主权争端、第三是政府管理部门的管理能力有限;其次是从国际因素来分析《公约》在越南实施的困境,如外部势力影响与干扰。第四章关于实施《海洋法公约》对中越合作的影响体现在四个方面:第一是有利于促进中越两国在保护海洋环境和科学研究方面的行动;第二是有助于推动两国海洋资源的共同开发;第三是有益于两国共同维护海洋安全;第四是有利于双方以和平方式解决海上争端。

关键词：《联合国海洋法公约》越南海洋法中越合作实施

来源：

同方学位论文库评论

在线全文

同方学位论文库

学校读者我要写书评

暂无评论

Synergistically boosting the elementary reactions over multiheterogeneous ordered macroporous Mo2C/NC-Ru for highly efficient alkaline hydrogen evolution

引用

Carbon Energy 2022年第5期4卷 856-866页

作者： Kaixi Wang Shuo Wang Kwan San Hui Haixing Gao Duc Anh dinh Chengzong Yuan Chenyang Zha Zongping Shao Zikang Tang Kwun Nam Hui Joint Key Laboratory of the Ministry of Education Institute of Applied Physics and Materials EngineeringUniversity of MacaoTaipaMacao SARChina School of Engineering Faculty of ScienceUniversity of East AngliaNorwichUK NTT Hi-Tech Institute Nguyen Tat Thanh UniversityHo Chi Minh CityVietnam State Key Laboratory of Materials-Oriented Chemical Engineering College of Chemical EngineeringNanjing Tech UniversityNanjingChina WA School of Mines:Minerals Energy and Chemical Engineering(WASM-MECE)Curtin UniversityPerthWestern AustraliaAustralia

Simultaneously enhancing the reaction kinetics,mass transport,and gas release during alkaline hydrogen evolution reaction(HER)is critical to minimizing the reaction polarization resistance,but remains a big *** rational design of a hierarchical multiheterogeneous three-dimensionally(3D)ordered macroporous Mo_(2)C-embedded nitrogen-doped carbon with ultrafine Ru nanoclusters anchored on its surface(OMS Mo_(2)C/NC-Ru),we realize both electronic and morphologic engineering of the catalyst to maximize the electrocatalysis *** formed Ru-NC heterostructure shows regulative electronic states and optimized adsorption energy with the intermediate H*,and the Mo_(2)C-NC heterostructure accelerates the Volmer reaction due to the strong water dissociation ability as confirmed by theoretical ***,superior HER activity in alkaline solution with an extremely low overpotential of 15.5 mV at 10 mAcm^(−2)with the mass activity more than 17 times higher than that of the benchmark Pt/C,an ultrasmall Tafel slope of 22.7 mV dec−1,and excellent electrocatalytic durability were achieved,attributing to the enhanced mass transport and favorable gas release process endowed from the unique OMS Mo_(2)C/NC-Ru *** oxidizing OMS Mo_(2)C/NC-Ru into OMS MoO_(3)-RuO_(2)catalyst,it can also be applied as efficient oxygen evolution electrocatalyst,enabling the construction of a quasi-symmetric electrolyzer for overall water *** a device's performance surpassed the state-of-the-art Pt/C||RuO2 *** study provides instructive guidance for designing 3D-ordered macroporous multicomponent catalysts for efficient catalytic applications.

关键词： heterostructure hydrogen evolution reaction molybdenum carbide ordered macroporous structure ruthenium nanoparticle synergistic effect

来源：

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

Assessment of Water Scarcity levels in the Srepok River Basin

引用

Open Journal of Modern Hydrology 2024年第4期14卷 231-249页

作者： le Van Linh Tu Anh Nguyen Nguyen Anh Duc Tran Van Tra Nguyen Thanh Long Dang dinh Duc Tran Duc Thinh Nguyen Thi Bich Water Resources Institute Ministry of Natural Resources and Environment Ha Noi Viet Nam Center for Environmental Fluid Dynamics VNU University of Science Ha Noi Viet Nam National Centre for Water Resources Planning and Investigation Ministry of Natural Resources and Environment Ha Noi Viet Nam Institute of Geography Viet Nam Academy of Science and Technology Ha Noi Viet Nam

Water scarcity has become a pressing global issue, worsening food security, hindering economic development, compromising environmental quality, and threatening human health and other fundamental societal needs. Viet Nam is among the countries severely affected by water scarcity. This study comprehensively assesses the extent and scale of water scarcity in the Srepok River Basin, considering the impacts of water resource allocation, balance, and environmental flows. The areas heavily affected by water scarcity include Ea Hleo, Ea Krong Ana, and several Srepok River branches, with water scarcity periods mainly concentrated in February, March, and April. The influence of climate change has increased the extent and level of water scarcity in the river, affecting an estimated 1.4 million people for at least one month and about 1 million for at least three months. The agricultural sector is significantly affected by water scarcity, with water shortages of 50% according to the baseline scenario and over 60% according to climate change scenarios.

关键词： Water Scarcity level Water Balance Climate Change RCP 4.5 Srepok River Basin

来源：

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

U形渠道机翼形量水槽水跃特性研究及数值模拟

U形渠道机翼形量水槽水跃特性研究及数值模拟

引用

作者： dinh THI HUONG 西北农林科技大学

学位级别：硕士

水跃是一种在自然界以及工程应用上普遍存在的急流过渡为缓流的水力现象，具有一定紊动特性和消能效果，同时还具有变化复杂的自由液面。在工程中主要发挥着消能的作用。机翼形量水槽是一种适用于平原灌区末级渠系的新型量水设备，其槽... 详细信息

水跃是一种在自然界以及工程应用上普遍存在的急流过渡为缓流的水力现象，具有一定紊动特性和消能效果，同时还具有变化复杂的自由液面。在工程中主要发挥着消能的作用。机翼形量水槽是一种适用于平原灌区末级渠系的新型量水设备，其槽后水跃的相关参数是判别量水槽选型是否合理的重要标准之一。首先，本文对水跃的中国国内外研究现状及其水跃的数值模拟研究进行了总结，针对目前灌区量水槽水跃研究中存在问题和不足，采用理论分析与实体模型试验和数值模拟相结合的方法，对U形渠道机翼形量水槽水跃进行了研究。实体模型试验采用U形渠道的形式，选择两种收缩比的量水槽，在西北农林科技大学北校区灌溉实验站渠道量水技术试验区进行试验。通过研究分析跃前水深、跃后水深、水跃长度、流速分布、对水跃消能率进行计算等，得到共轭水深比与跃前断面佛汝德数的关系，水跃长度的经验公式，消能率与跃前断面佛汝德数的关系等。应用Flow-3D软件建立不同工况下的U形渠道机翼形量水槽三维模型，进行水位流量的模拟计算，得到了不同工况下的量水槽过流流态、模拟计算水深值及流速分布等水力特性参数，通过与试验数据进行对比分析，得出应用Flow-3D软件可以准确地模拟U形渠道机翼形量水槽水跃的水力特性，本文所建立的数值模型对量水槽水跃水力特性的描述具有一定的参考性和应用价值。利用Flow-3D软件计算得到的跃前水深，跃后水深及水跃长度数据与实测数据相对平均误差为2.48%，4.36及4.75%，软件计算数据与实测数据吻合程度较高，满足数值模拟要求，同时也从另一方面证明了机翼形量水槽具有较高的测流精度。为了探讨U形渠道底坡对机翼形量水槽收缩比选择的影响，利用Flow-3D软件建立数值模拟试验方案，选择底弧半径20cm和底弧半径30cm两种规格的U形渠道，对不同底坡的U形渠道水跃水力特性进行了数值模拟研究。本文在水跃理论、模型试验和数值模拟分析的基础上，提出了水跃水力特性参数。通过总结前人对水跃的研究成果，对水跃问题的研究以及机翼形量水槽在平原灌区U形渠道的应用提供一定的工程技术参考。

关键词：机翼形量水槽 U形渠道水跃 Flow-3D

来源：

同方学位论文库评论

在线全文

同方学位论文库

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：