检索结果-内蒙古大学图书馆

engineering the environmentally sound warship for the twenty-first century

NAVAL ENGINEERS JOURNAL 1999年第3期111卷 189-217页

作者： Markle, SP Gill, SE McGraw, PS Udr. Stephen P. Markle USN is a career Engineering Duty officer assigned to Naval Sea Systems Command Arlington Virginia where he is Deputy Directs Environmental Programs Division (SEA 03L1 B). He is responsible fm program management activities associated with all ahat environmental protection equipment design and selection of environmental protection equipment and systems fm future surface ship designs (DD 21 CVN 7Z CW LPD 17) and serves on several teams designed to promote Nay wide awarmss of environmental protection requirements and Nay programs to meet these challenges. He is a 1993 graduate of the Naval Construction and Engineering Program at the Massachusetts Institute of Technology where he received a naval engineers degree and master of science in mechanical engineering. His interest in environmental issues predates his undergraduate studies at Syracuse Universityl State University of New Ymk College of Environmental Science and Fmestry where he received a bachelm of science degree in fmest engineering from the School of Environmental and Resource Engineering. LCdx Markle has qualified as a Surface Warfare Officer and in submarines through the Engineering Duty Dolphin Program he is a member of the Acquisition Professional Community and a graduate of the Defense Systems Management College Advanced Program Managers Course. He is a professional engineer registered in the State of New York and is a member ofthe American Society of Naval Engineers National Society of Professional Engineers American Society for Testing and Materials Society of Naval Architects and Marine Engineers and Society of Automotive Engineers. Peter 5. McGraw is current the Acting Branch Head ofthe Solid Waste Management Branch (Code 634) of the Environmental Quality Dwrtment of the Naval Surfice Warfare Centel: Carderock Division. As such he is responsible for among other things: the Shipboard Advanced Incinerator RDT&E Program the Submarine Plastic Waste RDT&E Program Solid Waste Processing Equipment Design Acquisitio

The past twenty-five years has been marked by the introduction ed marine environmental regulations that have had a profound effect on how ships are designed, built and operated. Ships being designed and built today must accommodate not only current regulations but anticipate those enacted over their thirty to fifty year life cycles. U.S. Chief of Naval Operations, Office of Environmental, Safety and Health (CNO N45) has articulated a vision for the Environmentally Sound Warship of the Twenty-first Century. This vision incorporates the "Sense of Congress" for a naval ship designed to operate in full compliance with environmental regulations worldwide. The task of the Navy engineering team is to translate this vision into reality;a ship capable of prevailing in time of war and able to conduct operations in all areas of the globe, unencumbered by special procedures for environmental compliance. The keys to this warship design are the early integration of environmentally sound principles, materials, and processes into the ship acquisition process;minimization of both hazardous materials and generation of post shipboard consumer waste during operation;adaptation of integrated systems to reduce the volume of wastes and enhance processing efficiency;reduced manpower requirements;and crew indoctrination in environmental protection.

关键词： Ships Environmental regulations engineering ARTICULATED Navy environmental security

来源：评论

学校读者我要写书评

暂无评论

Modelling and Application of Jutes Fiber Reinforced Epoxy Composite in the Development of Wind blade for Low Intensity Winds

SSRN

引用

SSRN 2023年

作者： Junio, Raí Felipe Pereira Cardoso, Robson Luis b. Ramos, Roberto Paulo b. Leão Filha, Elza M. Ribeiro, Mauricio M. Candido, Verônica S. Rodrigues, Jean da S. Silva, Douglas Santos Monteiro, Sergio N. Fujiyama, Roberto T. Federal University of Pará—UFPA Engineering of Natural Resources of the Amazon Program Rua Augusto Corrêa 01 PA BelémCEP 66075-110 Brazil Federal Institute of Education Science and Technology of Pará – IFPA Materials Engineering Program Avenida Almirante Barroso 1155 Marco PA BelémCEP 66093-020 Brazil Federal University of Pará - UFPA Postgraduate Program in Industrial Engineering Rua Augusto Corrêa 01 PA BelémCEP 66075-110 Brazil Federal Institute of Education Science and Technology of Pará – IFPA Estrada do Icuí Guajará PA AnanindeuaCEP 67125-000 Brazil Military Institute of Engineering – IME Department of Materials Science Praça General Tibúrcio 80 Praia Vermelha Urca RJ Rio de JaneiroCEP 22290-270 Brazil

Natural fibres show an increasing potential as reinforcement of polymeric composites, representing a promising concurrent to glass and carbon fibres extensively used in the construction of wind turbine blades synthetic fibres recyclability/disposability and high production energy cost have already been discussed in the main turbine producing centres. In particular, the development of wind turbines for low wind speed areas can increase the energy generation potential of regions not originally eligible for the installation of large turbines. This study proposes the evaluation of the use of jute fibre (Corchorus capsularis) reinforced epoxy composite in the construction of S1210 airfoil profile, of a small-scale wind turbine for low wind speed regions, considering the structural parameters, developed incorporating the Classical Laminate Theory (CLT) and Extended bredt-batho Shear Flow Theory (EbSFT).In order to raise the elastic properties and enable the use of the failure criteria, the composite blades were characterized according to ASTM standards. The mechanical properties surveyed, together with the elastic parameters of the cross section, torsional stiffness, axial stiffness and flexural rigidity, demonstrated the feasibility of using the jute fiber reinforced epoxy composite in the blade construction, evaluated according to the maximum tension failure criterion. © 2023, The Authors. All rights reserved.

关键词： Laminated composites

来源：评论

学校读者我要写书评

暂无评论

Theoretical insights into the chemical bonding, electronic structure, and spectroscopic properties of the lanarkite Pb2SO5 structure

arXiv

引用

arXiv 2023年

作者： Fabris, Guilherme S.L. Ferrer, Mateus M. Sambrano, Julio R. Almeida, Cláudio R.R. Paskocimas, Carlos A. La Porta, Felipe A. Graduate Program in Materials Science and Engineering Technological Development Center Universidade Federal de Pelotas RS Pelotas96010-610 Brazil Modeling and Molecular Simulation Group São Paulo State University Bauru São Paulo17033-360 Brazil Department of Materials Engineering Federal University of Rio Grande do Norte RN Natal59078-970 Brazil Postgraduate Program in Science and Engineering of Materials Federal University of Rio Grande do Norte RN Natal59078-970 Brazil Federal University of Technology - Paraná Nanotechnology and Computational Chemistry Laboratory Avenida dos Pioneiros 3131 CEP PR Londrina86036-370 Brazil State University of Londrina Post-Graduation Program in Chemistry Rodovia Celso Garcia Cid 445 km 380 CEP PR Londrina86057-970 Brazil

Lanarkite is a mineral formed by a combination of lead, sulphur, and oxygen atoms arranged in the general chemical formula Pb2SO5 (PSO) that crystallises with monoclinic symmetry (belonging to the C2/m space group, No. 12). This mineral was first discovered in Lanarkshire, Scotland and was named after its location. PSO has a unique structure comprising alternating penta-coordinated lead [PbO5] and tetra-coordinated sulphur [SO4] clusters. This lanarkite-type structure has recently attracted significant scientific interest and has been the focus of the superconducting material research community. However, its chemistry needs to be explored further. This article presents a comprehensive investigation on the chemical bonding, electronic structure, and spectroscopic properties of the lanarkite-type PSO structure from a computational perspective. Thus, different functionals in the DFT (e.g., PbE, PbE0, PbESOL, PbESOL0, bLYP, WC1LYP37, and b3LYP) were assessed to accurately predict their fundamental properties. All the DFT calculations were performed using a triple-zeta valence plus polarisation basis set. Among all the DFT functionals tested in this study, PbE showed the best agreement with the experimental data available in the literature. Our results also reveal that the [PbO5] clusters are formed with three Pb–O bond lengths, with values of about 2.32, 2.59, and 2.84 Å, respectively, while the [SO4] clusters have the same S–O bond length of 1.57 Å. We performed a complete topological analysis of this system to comprehend these structural differences. Additionally, the PSO structure has an indirect band gap energy of 2.9 eV and an effective mass ratio (mℎ∗ /me∗) of about 0.415 (using PbE calculations) which may, in principle, indicate a low recombination of electron-hole pairs in the lanarkite structure. Therefore, we believe that a detailed understanding of their electronic structures, spectroscopic properties as well as their chemical bonding is critically important

关键词： Lead compounds

来源：评论

学校读者我要写书评

暂无评论

Pressure-driven homogenization of lithium disilicate glasses

arXiv

引用

arXiv 2023年

作者： bakhouch, Yasser buchner, Silvio Silveira, Rafael Abel Resende, Leonardo Pereira, Altair Soria Hasnaoui, Abdellatif Atila, Achraf LS2ME Faculté Polydisciplinaire Khouribga Sultan Moulay Slimane University of Beni Mellal B.P 145 Khouribga25000 Morocco Graduate Program in Materials Science Federal University of Rio Grande do Sul Porto Alegre Brazil Department of Material Science and Engineering Saarland University Saarbrücken66123 Germany

Lithium disilicate glasses and glass-ceramics are good potential candidates for biomedical applications and solid-state batteries, and serve as models of nucleation and crystal growth. Moreover, these glasses exhibit a phase separation that influences their nucleation and crystallization behavior. The atomistic mechanisms of the phase separation and their pressure dependence are unclear so far. Here, we used molecular dynamics simulations supported by experiments to assess the spatial heterogeneity of lithium disilicate glasses prepared under pressure. We show that the glass heterogeneity decreases with increasing the cooling pressure and almost disappears at pressures around 30 GPa. The origin of the heterogeneity is due to the attraction between Li cations to form clustering channels, which decreases with pressure. Through our results, we hope to provide valuable insights and guidance for making glass-ceramics with controlled crystallization. Copyright © 2023, The Authors. All rights reserved.

关键词： Phase separation

来源：评论

学校读者我要写书评

暂无评论

Micromobility: Progress, benefits, challenges, policy and regulations, energy sources and storage, and its role in achieving sustainable development goals

引用

International Journal of Thermofluids 2023年 17卷

作者： Olabi, A.G. Wilberforce, Tabbi Obaideen, Khaled Sayed, Enas Taha Shehata, Nabila Alami, Abdul Hai Abdelkareem, Mohammad Ali Dept. of Sustainable and Renewable Energy Engineering University of Sharjah P.O. Box 27272 Sharjah United Arab Emirates Mechanical Engineering and Design Aston University School of Engineering and Applied Science Birmingham Aston TriangleB4 7ET United Kingdom Center for Advanced Materials Research University of Sharjah PO Box 27272 Sharjah United Arab Emirates Faculty of Engineering Minia University Elminia Egypt Environmental Science and Industrial Development Department Faculty of Postgraduate Studies for Advanced Sciences Beni-Suef University Beni-Suef Egypt

Micromobility is dominant in urban areas, enhancing the transportation sustainability and assisting in fulfilling the United Nations Sustainable Development Goals (SDGs). This work provides an overall assessment of micromobility: its role under SDGs, policy options, micromobility regulations, emerging technologies, utilisation determinants, energy source, and energy storage. The analysis shows that micromobility could play a major role in achieving the SDGs, specifically SDG 3 (Good Health and Well-being) by lowering toxic gas emissions and reducing projected traffic accidents. Also, the effect on SDG 8 (Decent Work and Economic Growth) by reducing the transportation footprint, on SDG 11 (Sustainable Cities and Communities) by increasing transposition accessibility, reducing traffic congestion and improving the air quality, and equally on SDG 12 (Responsible Consumption and Production) by reducing transportation footprint and increase the sources efficiency. Moreover, micromobility affects SDG 13 (Climate Action) by reducing the greenhouse gases. Furthermore, the analysis shows a clear gap in literature and publications on micromobility, especially in energy management and energy storage area. This review shows that new technology of renewable energy and energy storage could play a significant role in achieving the sustainability of micromobility therefore achieving the SDGs. © 2023

关键词： Sustainable development

来源：评论

学校读者我要写书评

暂无评论

Flash Sintering with Concurrent Crystallization of Li 1.5Al 0.5Ge 1.5(PO 4) 3 Glass

SSRN

引用

SSRN 2022年

作者： Campos, João V. Lavagnini, Isabela Reis Zallocco, Vinicius Martins Ferreira, Eduardo b. de Jesus Agnolon Pallone, Eliria Maria Rodrigues, Ana Candida Martins Graduate Program in Materials Science and Engineering Federal University of São Carlos SP São Carlos13635-905 Brazil Department of Materials Engineering Federal University of São Carlos SP São Carlos13635-905 Brazil Center for Research Technology and Education of Vitreous Materials CeRTEV FAPESP LaMaV DEMa/UFSCar SP São Carlos13635-905 Brazil Department of Biosystem Engineering University of São Paulo USP Av. Duque de Caxias Norte 225 SP Pirassununga13635-900 Brazil Postgraduate Programme in Materials Science and Engineering University of São Paulo USP FZEA Av. Duque de Caxias Norte 225 Pirassununga13635-900 Brazil Department of Materials Engineering São Carlos School of Engineering University of São Paulo USP SP São Carlos13566-590 Brazil

Single-phased Li1.5Al0.5Ge1.5(PO4)3NaSICON (Na superionic conductor) glass-ceramic is obtained via a new route using flash-sinter crystallization . Green pellets of glass powder are sinter-crystallized in a few seconds. Our results suggest that controlling the current rise during the flash event is needed to avoid overheating that could cause the melting of the samples. A processing map for the flash sinter-crystallization of Li1.5Al0.5Ge1.5(PO4)3 is developed and presented based on the current density and holding time at the steady-state. The samples fabricated by flash sinter-crystallization are compared with conventionally heated ones. Using this novel technique, single-phase glass-ceramics were obtained with total ionic conductivity at room temperature surpassing those prepared by conventional heating (2.26 10-4S cm-1 and 1.36 10-4S cm-1, respectively). © 2022, The Authors. All rights reserved.

关键词： Solid electrolytes

来源：评论

学校读者我要写书评

暂无评论

Eco-Friendly High Entropy Oxide Rock-Salt Type Structure for Oxygen Evolution Reaction Obtained by Green Synthesis Using Red Seaweed (Rhodophyta)

SSRN

引用

SSRN 2024年

作者： Santos, Jakeline RAIANE DORA DOS Raimundo, Rafael A. de Oliveira, João F.G.A. Hortencio, Johnnys da S. Loureiro, Francisco J.A. Macedo, Daniel A. Morales, Marco A. Gualandi, Isacco Tonelli, Domenica Gomes, Uílame U. Materials Science and Engineering Postgraduate Program UFRN Natal59078-970 Brazil Department of Industrial Chemistry "Toso Montanari" Industrial Chemistry UNIBO V.le Risorgimento 4 Bologna40136 Italy Department of Theoretical and Experimental Physics Federal University of Rio Grande do Norte UFRN Natal59078-970 Brazil Gleb Wataghin Institute of Physics - R. Sérgio Buarque de Holanda 777 - Cidade Universitária Campinas13083-859 Brazil Department of Chemistry Federal University of Paraíba UFPB João Pessoa58.051-900 Brazil TEMA - Centre for Mechanical Technology and Automation Mechanical Engineering Department University of Aveiro 3810-193 Portugal LASI - Intelligent Systems Associate Laboratory Portugal Materials Science and Engineering Postgraduate Program Federal University of Paraíba UFPB João Pessoa58051-900 Brazil

Global energy consumption increases year after year, causing the depletion of non-renewable sources. According to the International Energy Agency (IEA), global demand for electrical energy is expected to increase by 3.3% in 2024. Therefore, developing new renewable sources is urgent, including new devices for energy storage and conversion, particularly those governed by electrochemical reactions. Water splitting is a clean and sustainable technology capable of facing this issue by producing oxygen and hydrogen from water and electricity. However, a problem related to this technology is the slow kinetics, making it necessary to develop new electrocatalysts with high electrochemical performance. To meet this requirement, this work deals with for the first time a high entropy oxide with rock-salt structure synthesized by a green solgel synthesis using red seaweed (Rhodophyta) as polymerizing agent. Solgel synthesis allows the large-scale production of nanomaterials with high uniformity and dispersion of the chemical elements involved. The literature, which discussed the production of these oxides, reveals that agents harmful to the environment are applied during the synthesis steps, including sodium hydroxide, acetic acid, hexadecyltrimethylammonium bromide, urea, and ammonia. The composition of the high entropy oxide is (Mg0.2 Ni0.2 Co0.2 Cu0.2 Zn0.2 )O, it displays a low overpotential (336 mV vs. RHE at 10 mA cm-2 ), Tafel slope of 68 mV dec-1 , and excellent durability. The electrochemical performance of the high entropy oxide prepared in this work is superior to other electrocatalysts of the same class that were produced using transition metal-based precursors. © 2024, The Authors. All rights reserved.

关键词： Entropy

来源：评论

学校读者我要写书评

暂无评论

Thermophysical properties of graphene-based nanofluids

引用

International Journal of Thermofluids 2021年 10卷

作者： Elsaid, Khaled Abdelkareem, Mohammad Ali Maghrabie, Hussein M. Sayed, Enas Taha Wilberforce, Tabbi baroutaji, Ahmad Olabi, A.G. Chemical Engineering Program Texas A& M University College StationTX United States Dept. of Sustainable and Renewable Energy Engineering University of Sharjah P.O. Box 27272 Sharjah United Arab Emirates Center for Advanced Materials Research University of Sharjah PO Box 27272 Sharjah United Arab Emirates Chemical Engineering Department Minia University Elminia Egypt Department of Mechanical Engineering Faculty of Engineering South Valley University Qena83521 Egypt Mechanical Engineering and Design Aston University School of Engineering and Applied Science Aston Triangle BirminghamB4 7ET United Kingdom School of Engineering Faculty of Science and Engineering University of Wolverhampton Telford United Kingdom

Heat transfer operations are very common in the process industry to transfer a huge amount of thermal energy, i.e., heat, from one fluid to another for different purposes. Many fluids are used as heat transfer fluid (HTF), in which water is the most common HTF due to its high specific heat, availability, and affordability. However, conventional HTFs, including water, have a lower thermal conductivity, which is the most critical thermophysical property, hence decreased heat transfer efficiency. The addition of solid particles of highly thermally conductive material, specifically at nano-size, i.e., nanoparticles NPs, result in nanofluid NF, which has evolved over the last two decades as efficient HTF and have been investigated in a wide range of applications. Among NPs, graphene (Gr) based materials have shown very high potential as NF due to the very high thermal conductivity up to 5,000 W/m.K, hence higher thermal conductivity NF. This work aims to thoroughly discuss the thermophysical properties of Gr-based NFs, including thermal conductivity, heat capacity, density, and viscosity. The discussion focus on the thermophysical properties as it is the ultimate determinator of the heat transfer characteristics of the HTF, such as the convective and the overall heat transfer coefficient as well as the heat transfer capacity of the NF. The discussion expands to the relative enhancement in such thermophysical properties reaching up to a 40% increase in thermal conductivity, as the most critical thermophysical property. The discussion shows that Gr-based NF has a much higher thermal conductivity relative to widely studied metal oxide NF and at much lower content, and lower density and viscosity increase, which is critical for determining the pumping power requirements. Critical challenges facing the application of Gr-based NFs such as cost, stability, increased density and viscosity, and environmental impacts are thoroughly discussed with mitigation recommendations given.

关键词： Graphene

来源：评论

学校读者我要写书评

暂无评论

Photoluminescence of bismuth Germanate Phosphors with a Silica-shell Structure

引用

Physics Procedia 2012年 29卷 91-96页

作者： M.J. Oviedo J.K. Han O. Contreras Z.S. Macedo G.A. Hirata J. McKittrick Programa de Posgrado en F'sica de Materiales CICESE-UNAM carretera Ensenada-Tijuana No. 3918 Ensenada B.C. MŽxico University of California at San Diego Materials Science and Engineering Program La Jolla CA 92093-0418 Centro de Nanociencias y Nanotecnolog’a UNAM Ensenada B.C. MŽxico Departamento de F'sica Universidade Federal de Sergipe Sao Cristva SE Brazil University of California at San Diego Mechanical and Aerospace Engineering La Jolla CA 92093-0411

An intense bluish-white emitting phosphor bi 4 Ge 3 O 12 (bGO) was synthesized by tartaric acid-assisted solgel method and covered with a SiO 2 nanolayer by the sol-gel method. The cubic crystal structure of bGO was confirmed by X-ray diffraction. Transmission electron microscopy analysis revealed the particle size to be in the range of 6-20 nm. Under excitation with 4.3 eV photons the bGO powders showed a PL contribution centered at 2.43 eV that corresponds to the typical bGO luminescence associated with 3 P 1 à 1 S0 of bi 3+ electron transitions. Radioluminescence measurements showed the predominant emission centered at 2.43 eV due to the intra-ionic bi3+ transitions. The PL emission of the silica coated bGO nanoparticles presented a luminescence enhancement of more than 200% compared with the uncoated nanoparticles. This enhancement in photoluminescence is proposed to be related to the reflectivity (refractive index) between air-silica-bGO layers.

关键词： bismuth germanate sol-gel silica coating photoluminescence

来源：评论

学校读者我要写书评

暂无评论

Geometrical effect coupled with nanofluid on heat transfer enhancement in heat exchangers

引用

International Journal of Thermofluids 2021年 10卷

作者： Olabi, A.G. Wilberforce, Tabbi Sayed, Enas Taha Elsaid, Khaled Rahman, S.M.Atiqure Abdelkareem, Mohammad Ali Department of Sustainable and Renewable Energy Engineering University of Sharjah P.O. Box 27272 Sharjah United Arab Emirates Mechanical Engineering and Design Aston University School of Engineering and Applied Science Aston Triangle BirminghamB4 7ET United Kingdom Center for Advanced Materials Research University of Sharjah PO Box 27272 Sharjah United Arab Emirates Chemical Engineering Department Minia University Elminia Egypt Chemical Engineering Program Texas A& M University College StationTX United States

This investigation summarized the application of nanofluids (NFs) in heat exchangers (HExs) with different geometries. The quest for heat devices with quick response for the industrial sector is still a major challenge that has been an active research direction over the years. Addressing this issue is likely to increase the capacity of several industries. There is a direct relationship between expanding the heat capacity and the pressure drop. The common approach in increasing the rate of heat transfer often leads to an increment in pressure drop. This study reviews and summarizes the investigations on various geometrical effects inside the channel combined with NF in HExs. This review explored the potential of NFs as possible heat transfer fluid in HExs. From a detailed literature review compiled and evaluated, it has been deduced that NFs application significantly improves the thermal efficiency of HExs. The investigation further evaluated plate, helical, as well as shell and tube HExs. The review explored NFs application in HExs and how they can significantly improve the HExs' thermal characteristics. It was deduced that the use of NFs improved the heat transfer both experimentally and numerically. This equally has a direct relation to energy savings as well as industrial waste heat. © 2021 The Author(s)

关键词： Heat exchangers

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：