检索结果-内蒙古大学图书馆

arXiv 2018年

作者： Huang, Congliang Qian, Xin Yang, Ronggui School of Electrical and Power Engineering China University of Mining and Technology Xuzhou221116 China Department of Mechanical Engineering University of Colorado BoulderCO80309 United States Materials Science and Engineering Program University of Colorado BoulderCO80309 United States

Polymers are widely used in industry and in our daily life because of their diverse functionality, light weight, low cost and excellent chemical stability. However, on some applications such as heat exchangers and electronic packaging, the low thermal conductivity of polymers is one of the major technological barriers. Enhancing the thermal conductivity of polymers is important for these applications and has become a very active research topic over the past two decades. In this review article, we aim to: 1). systematically summarize the molecular level understanding on the thermal transport mechanisms in polymers in terms of polymer morphology, chain structure and inter-chain coupling;2). highlight the rationales in the recent efforts in enhancing the thermal conductivity of nanostructured polymers and polymer nanocomposites. Finally, we outline the main advances, challenges and outlooks for highly thermal-conductive polymer and polymer nanocomposites. Copyright © 2018, The Authors. All rights reserved.

关键词： Nanocomposites

来源：评论

学校读者我要写书评

暂无评论

Hybrid Beam Forming with Data Logging Scheduling(DLS) for wireless sensor network(WSN)

Hybrid Beam Forming with Data Logging Scheduling(DLS) for wi...

引用

2017 IEEE International Conference on Applied System Innovation, ICASI 2017

作者： Renu, Sakthidasan Yen, Lei Belay, Abebe Lin, Hsin-Piao Jeng, Shiann-Shiun Department of International Graduate Program in Electrical Engineering and Computer Science National Taipei University of Technology Taiwan Department of Electronic Engineering National Taipei University of Technology Taiwan Department of Electrical Engineering National Dong Hwa University Taipei Taiwan

ISBN: (纸本)9781509048977

Improve of the overall network efficiency between source and destination relay selection and interference free communication is important criteria in WSN. In this paper we are proposing SON based algorithm capable of simultaneous Scheduling and Routing in WSN. The proposes scheme contains the three stages, in first stage the sensor nodes are classified into different clusters and each nodes having different weight based on distance from base station. In second stage the IRSS (Improvised Received Signal Strength) based scheme used select Routing path based on the Node weight, Residual Energy and Probability of Link Loss values of Relay Sensors. On the other side the channel estimation algorithm executed simultaneously with previous two stages. In final we are implementing the Data Logging based Scheduling and Routing scheme (DLSR) for WSN with Energy and Maximized Throughput. We are applying path recovery algorithm in presence of Void path or node failures. The proposed scheme additionally will form the virtual relay path to make communication with nearly zero loss. © 2017 IEEE.

关键词： Scheduling

来源：评论

学校读者我要写书评

暂无评论

Retracted: Effect of Types and Gap on Spark Plugs on Exhaust Emissions on the 110CC Double Wheel Vehicles and Its Dissemination Using Website

Retracted: Effect of Types and Gap on Spark Plugs on Exhaust...

引用

2018 Workshop on Multidisciplinary and Its Applications: Applied Mathematics, computer science, Information Systems, and Information Technology, WMA-Mathcomtech 2018

作者： Ginting, Tinus Manurung, Hotler Harahap, Astro Julida Ongko, Erianto Hartono, H. Abdullah, Dahlan Erliana, Cut Ita Saddhono, Kundharu Sriadhi, S. Supriyono, S. Iskandar, Akbar Saleh, A.A. Sudarsana, I. Ketut Department of Mechanical Engineering Akademi Teknologi Industri Immanuel Indonesia Department of Informatics Akademi Teknologi Industri Immanuel Indonesia Department of Computer Science STMIK IBBI Medan Indonesia Department of Informatics Universitas Malikussaleh Aceh Indonesia Department of Industrial Engineering Universitas Malikussaleh Aceh Indonesia Graduate Program Universitas Sebelas Maret Surakarta Indonesia Department of Electrical Engineering Universitas Negeri Medan Indonesia Department of Geography Education Universitas Prof Dr Hazairin SH Bengkulu Indonesia Department of Informatics STMIK AKBA Makassar Indonesia Statistics Financial and Social Sciences Research Group Indonesia Department of Religious Education Institut Hindu Dharma Negeri Denpasar Denpasar Indonesia

Based on the formulation of the problem to be discussed by the writer is to know: the influence of 0.4 mm spark gap variation, and standard spark plug type, to CO and HC, the influence of 0.5 mm spark plug gap variation, and variation of platinum spark plug on CO and HC, influence of spark gap variation 0,6mm, and variation of iridium spark plug type to CO and HC emission Method used to obtain data needed to support the writer that is research method with experiment, literature study method or literature study The result of this research concludes that there is spark gap influence 0.4 mm, with variations of standard plug, platinum and iridium spark plugs against CO and HC emissions, where the lowest CO value is 0.27% and HC 98 ppm, 0.5 mm spark plug with lowest CO 0.15% and HC 46 ppm, 0.6 mm spark plug gap the lowest CO value of 0.19% and HC 24 ppm. The results of this research will be disseminated using the website. © Published under licence by IOP Publishing Ltd.

关键词： Information systems

来源：评论

学校读者我要写书评

暂无评论

Interfacial Evaporation: Graphene–Carbon Composites for Solar and Low-Voltage Powered Efficient Interfacial Evaporation (Adv. Sustainable Syst. 3/2020)

引用

Advanced Sustainable Systems 2020年第3期4卷

作者： Fenghua Liu Lijian Wang Robert Bradley Binyuan Zhao Weiping Wu State Key Laboratory of Metal Matrix Composites School of Materials Science and Engineering Shanghai Jiao Tong University Shanghai 200240 China Department of Materials University of Oxford 16 Parks Road Oxford OX1 3PH UK MatSurf Technology Ltd. The Old Stables Marion Lodge Little Salkeld Penrith Cumbria CA10 1NW UK Department of Electrical and Electronic Engineering School of Mathematics Computer Science and Engineering City University of London Northampton Square London EC1V 0HB UK

来源：评论

学校读者我要写书评

暂无评论

Lattice-mismatched semiconductor heterostructures

arXiv

引用

arXiv 2018年

作者： Liu, Dong Cho, Sang June Seo, Jung-Hun Kim, Kwangeun Kim, Munho Shi, Jian Yin, Xin Choi, Wonsik Zhang, Chen Kim, Jisoo Baboli, Mohadeseh A. Park, Jeongpil Bong, Jihye Lee, In-Kyu Gong, Jiarui Mikael, Solomon Ryu, Jae Ha Mohseni, Parsian K. Li, Xiuling Gong, Shaoqin Wang, Xudong Ma, Zhenqiang Department of Electrical and Computer Engineering University of Wisconsin –Madison MadisonWI53706 United States Department of Materials Science and Engineering University of Wisconsin –Madison MadisonWI United States Department of Electrical and Computer Engineering University of Illinois – Urbana Champaign ChampaignIL61820 United States Microsystems Engineering and NanoPower Research Laboratories Rochester Institute of Technology RochesterNY14623 United States Department of Biomedical Engineering University of Wisconsin –Madison MadisonWI United States

Semiconductor heterostructure is a critical building block for modern semiconductor devices. However, forming semiconductor heterostructures of lattice-mismatch has been a great challenge for several decades. Epitaxial growth is infeasible to form abrupt heterostructures with large lattice-mismatch while mechanical-thermal bonding results in a high density of interface defects and therefore severely limits device applications. Here we show an ultra-thin oxide-interfaced approach (named as "grafting") for the successful formation of lattice-mismatched semiconductor heterostructures. Following the depiction of a theory on the role of interface oxide in forming the heterostructures, we describe experimental demonstrations of Ge/Si (diamond lattices), Si/GaAs (zinc blende lattice), GaAs/GaN (hexagon lattice), and Si/GaN heterostructures. Extraordinary electrical performances in terms of ideality factor, current on/off ratio, and reverse breakdown voltage are measured from p-n diodes fabricated from the four types of heterostructures, significantly outperforming diodes derived from other methods. Our demonstrations indicate the versatility of the ultra-thin-oxide-interface approach in forming lattice-mismatched heterostructures, open up a much larger possibility for material combinations for heterostructures, and pave the way toward broader applications in electronic and optoelectronic realms. Copyright © 2018, The Authors. All rights reserved.

关键词： Heterojunctions

来源：评论

学校读者我要写书评

暂无评论

Characterization of Graphene Gate Electrodes for Metal-Oxide-Semiconductor Devices

Characterization of Graphene Gate Electrodes for Metal-Oxide...

引用

MRS Advances

作者： An, Yanbin Shekhawat, Aniruddh Behnam, Ashkan Pop, Eric Ural, Ant Department of Electrical and Computer Engineering University of Florida GainesvilleFL32611 United States Department of Materials Science and Engineering University of Florida GainesvilleFL32611 United States Department of Electrical and Computer Engineering University of Illinois at Urbana-Champaign UrbanaIL61801 United States

We fabricate and characterize metal-oxide-semiconductor (MOS) devices with graphene as the gate electrode, 5 or 10 nm thick silicon dioxide as the insulator, and silicon as the semiconductor substrate. We find that Fowler-Nordheim tunneling dominates the gate current for the 10 nm oxide device. We also study the temperature dependence of the tunneling current in these devices in the range 77 to 300 K and extract the effective tunneling barrier height as a function of temperature for the 10 nm oxide device. Furthermore, by performing high frequency capacitance-voltage measurements, we observe a local capacitance minimum under accumulation, particularly for the 5 nm oxide device. By fitting the data using numerical simulations based on the modified density of states of graphene in the presence of charged impurities, we show that this local minimum results from the quantum capacitance of graphene. These results provide important insights for the heterogeneous integration of graphene into conventional silicon technology. © 2017 materials Research Society.

关键词： Graphene

来源：评论

学校读者我要写书评

暂无评论

Momentum-Dark Intervalley Exciton in Monolayer Tungsten Diselenide Brightened via Chiral Phonon

arXiv

引用

arXiv 2019年

作者： Li, Zhipeng Wang, Tianmeng Jin, Chenhao Lu, Zhengguang Lian, Zhen Meng, Yuze Blei, Mark Gao, Mengnan Taniguchi, Takashi Watanabe, Kenji Ren, Tianhui Cao, Ting Tongay, Sefaattin Smirnov, Dmitry Zhang, Lifa Shi, Su-Fei School of Chemistry and Chemical Engineering Key Laboratory for Thin Film and Micro Fabrication of the Ministry of Education Shanghai Jiao Tong University Shanghai200240 China Department of Chemical and Biological Engineering Rensselaer Polytechnic Institute TroyNY12180 United States Kavli Institute at Cornell for Nanoscale Science IthacaNY14853 National High Magnetic Field Lab TallahasseeFL32310 United States Department of Physics Florida State University TallahasseeFL32306 United States College of Physics Nanjing University NanjingP. R.210093 China National Institute for Materials Science 1-1 Namiki Tsukuba305-0044 Japan School for Engineering of Matter Transport and Energy Arizona State University TempeAZ85287 United States Geballe Laboratory for Advanced Materials Stanford University StanfordCA94305 United States Department of Materials Science and Engineering University of Washington SeattleWA98195 United States Center for Quantum Transport and Thermal Energy Science School of Physics and Technology Nanjing Normal University Nanjing210023 China Department of Electrical Computer & Systems Engineering Rensselaer Polytechnic Institute TroyNY12180 United States

Inversion symmetry breaking and three-fold rotation symmetry grant the valley degree of freedom to the robust exciton in monolayer transition metal dichalcogenides (TMDCs), which can be exploited for valleytronics applications. However, the short lifetime of the exciton significantly constrains the possible applications. In contrast, dark exciton could be long-lived but does not necessarily possess the valley degree of freedom. In this work, we report the identification of the momentum-dark, intervalley exciton in monolayer WSe2 through low-temperature magneto-photoluminescence (PL) spectra. Interestingly, the intervalley exciton is brightened through the emission of a chiral phonon at the corners of the Brillouin zone (K point), and the pseudoangular momentum (PAM) of the phonon is transferred to the emitted photon to preserve the valley information. The chiral phonon energy is determined to be ~ 23 meV, based on the experimentally extracted exchange interaction (~ 7 meV), in excellent agreement with the theoretical expectation of 24.6 meV. The long-lived intervalley exciton with valley degree of freedom adds an exciting quasiparticle for valleytronics, and the coupling between the chiral phonon and intervalley exciton furnishes a venue for valley spin manipulation. Copyright © 2019, The Authors. All rights reserved.

关键词： Phonons

来源：评论

学校读者我要写书评

暂无评论

Mechanisms of Ultrafast Charge Separation in a PTB7/Monolayer MoS2 van der Waals Heterojunction

arXiv

引用

arXiv 2018年

作者： Zhong, Chengmei Sangwan, Vinod K. Wang, Chen Bergeron, Hadallia Hersam, Mark C. Weiss, Emily A. Department of Chemistry Northwestern University EvanstonIL60208-3113 United States Department of Materials Science and Engineering Northwestern University EvanstonIL60208-3113 United States Department of Electrical Engineering and Computer Science Northwestern University EvanstonIL60208-3113 United States

Mixed-dimensional van der Waals heterojunctions comprising polymer and two-dimensional (2D) semiconductors have many characteristics of an ideal charge separation interface for optoelectronic and photonic applications. However, the photoelectron dynamics at polymer-2D semiconductor heterojunction interfaces are currently not sufficiently understood to guide the optimization of devices for these applications. This manuscript is a report of a systematic exploration of the time-dependent photophysical processes that occur upon photoexcitation of a type-II heterojunction between the polymer PTB7 and monolayer MoS2. In particular, photoinduced electron transfer from PTB7 to electronically hot states of MoS2 occurs in less than 250 fs. This process is followed by a slower (1-5 ps) exciton diffusion-limited electron transfer from PTB7 to MoS2 with a yield of 58%, and a sub-3-ps photoinduced hole transfer from MoS2 to PTB7. The equilibrium between excitons and polaron pairs in PTB7 determines the charge separation yield, whereas the 3-4 ns lifetime of photogenerated carriers is limited by MoS2 defects. Overall, this work elucidates the mechanisms of ultrafast charge carrier dynamics at PTB7-MoS2 interfaces, which will inform ongoing efforts to exploit polymer-2D semiconductor heterojunctions for photovoltaic and photodetector applications. Copyright © 2018, The Authors. All rights reserved.

关键词： Molybdenum compounds

来源：评论

学校读者我要写书评

暂无评论

Molybdenum Disulfide: Scalable Fabrication of Molybdenum Disulfide Nanostructures and their Assembly (Adv. Mater. 43/2020)

引用

Advanced materials 2020年第43期32卷

作者： Yun Huang Kang Yu Huaizhi Li Kai Xu Zexi Liang Debora Walker Paulo Ferreira Peer Fischer Donglei (Emma) Fan Materials Science and Engineering Program Texas Materials Institute The University of Texas at Austin Austin TX 78712 USA The Department of Advanced Electron Microscopy Imaging and Spectroscopy International Iberian Nanotechnology Laboratory Braga 4715‐330 Portugal Electrical and Computer Engineering University of Illinois at Urbana‐Champaign Urbana IL 61801 USA School of Engineering and Applied Sciences Harvard University Cambridge MA 02138 USA Mechanical Engineering Department and IDMEC Instituto Superior Técnico University of Lisbon Av. Rovisco Pais Lisboa 1049‐001 Portugal Max‐Planck‐Institute for Intelligent Systems Heisenbergstr. 3 Stuttgart 70569 Germany Institute of Physical Chemistry University of Stuttgart Pfaffenwaldring 55 Stuttgart 70569 Germany Walker Department of Mechanical Engineering The University of Texas at Austin Austin TX 78712 USA

来源：评论

学校读者我要写书评

暂无评论

A testbed of intelligent sun tracking system and thermoelectric generator with Fresnel lens at solar cell system for maximizing generated energy

引用

Journal of Physics: Conference Series 2020年第1期1595卷

作者： M Muladi M F A Jalil A Aripriharta I Fadlika S Hidayat S Sendari A N A Afandi G J Horng W M Utomo Department of Electrical Engineering Faculty of Engineering Universitas Negeri Malang Jl. Semarang No. 5 Malang 65145 Indonesia Center for Advanced Materials and Renewable Energy (CAMRY) Universitas Negeri Malang Jl. Semarang No. 5 Malang 65145 Indonesia Department of Physics Faculty of Mathematics and Natural Science Universitas Negeri Malang Jl. Semarang No. 5 Malang 65145 Indonesia Department of Computer Science and Information Engineering Southern Taiwan University of Science and Technology Tainan City Taiwan Fakulti Kejuruteraan Elektrik dan Elektronik Universiti Tun Hussein Onn Malaysia

Solar or photovoltaic cells are one of the most potent renewable technologies to be applied in Indonesia that have a relatively high average daily solar radiation rate of 4.5 kWh/m2/day. In conventional applications, solar cells still have some weaknesses, especially on the efficiency of output that only reaches in the range of 5—16%. In this paper, optimizing the production of electrical energy in conventional solar cell system is carried out by modifying the system construction and controller. Intelligent Mobile Thermophotovoltaic (IMT) is a modified solar cell system that combines utilization of two sources of solar energy that are photon and thermal energy to convert into electrical energy. The sollar panel is intelligently controlled to maximized the received sunlight in solar cell. Fresnel lens is utilized for supporting the thermal energy collection of sunlight on the solar cell. The total energy produced by IMT is energy from Fresnel solar tracking concentrator plus the energy from thermoelectric heat collector and subtracted by energy which used for tracking system of about 2 Wh. The IMT can yield the electrical power of 91.815 Wh while the conventional solar cell system brought 55.15 Wh for 8 operation hours. This result showed that IMT can raise 66.46% the electrical energy production of conventional solar cell system.

关键词：

来源：评论

学校读者我要写书评

暂无评论

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

请选择保存的检索档案：

请选择收藏分类：

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

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

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：