检索结果-内蒙古大学图书馆

Oxide-based materials and Devices XVI 2025

作者： Dutton, Benjamin L. Sakaguchi, Nathan T. Varley, Joel B. McCluskey, Matthew D. McCloy, John S. Institute of Materials Research Washington State University PullmanWA99164-2711 United States Materials Science & Engineering Program Washington State University PullmanWA99164-2711 United States Lawrence Livermore National Laboratory LivermoreCA94551-0808 United States Dept. of Physics and Astronomy Washington State University PullmanWA99164-2814 United States

ISBN: (纸本)9781510684829

Melt growth of β-Ga2O3 has been demonstrated by a variety of techniques primarily utilizing iridium crucibles, or no crucible at all in the case of floating zone. Impurities are ubiquitous in these crystals originating either during the growth, as in the case of iridium from crucibles, or from the source powders. In this work, we detail spectroscopic methods for probing impurity distributions spatially in crystals grown by the Ir crucible Czochralski versus crucible-free floating zone method. For insulating samples, luminescence from Cr3+ and electronic-coupled Raman scattering from Ir4+ revealed micro-segregation phenomena, while a Raman line attributed to hydrogenic shallow donors was applied to map spatial donor concentration variability in n-type crystals. Floating zone crystals doped or alloyed with Gd exhibited unique segregation phenomena and rare-earth element contamination revealed by photoluminescence mapping. © 2025 SPIE.

关键词： Photoluminescence

来源：评论

学校读者我要写书评

暂无评论

Frustrated metastable-to-equilibrium grain boundary structural transition in NbMoTaW due to segregation and chemical complexity

arXiv

引用

arXiv 2023年

作者： Geiger, Ian Apelian, Diran Pan, Xiaoqing Cao, Penghui Luo, Jian Rupert, Timothy J. Material and Manufacturing Technology University of California IrvineCA92697 United States Department of Materials Science and Engineering University of California IrvineCA92697 United States Department of Physics and Astronomy University of California IrvineCA92697 United States Department of Mechanical and Aerospace Engineering University of California IrvineCA92697 United States Department of NanoEngineering University of California San Diego La Jolla CA92093 United States Program in Materials Science and Engineering University of California San Diego La Jolla CA92093 United States

Grain boundary structural transitions can lead to significant changes in the properties and performance of materials. In multi-principal element alloys, understanding these transitions becomes complex due to phenomena such as local chemical ordering and multi-component segregation. Using atomistic simulations, we explore a metastable-to-equilibrium grain boundary structural transition in NbMoTaW. The transition, characterized by structural disordering and reduced free volume, shows high sensitivity to its local chemical environment. Most notably, the transition temperature range of the alloy is more than twice that of a pure metal. Differences in composition between coexisting metastable and equilibrium structures highlight the change in local site availability due to structural relaxation. Further examination of grain boundaries with fixed chemical states at varying temperatures reveals that the amount of segregation significantly influences the onset temperature yet has minimal effect on the transition width. These insights underscore the profound effect of chemical complexity and ordering on grain boundary transitions in complex concentrated alloys, marking a meaningful advancement in our understanding of grain boundary behavior at the atomic level. Copyright © 2023, The Authors. All rights reserved.

关键词： Grain boundaries

来源：评论

学校读者我要写书评

暂无评论

Fabrication of sandwich-structured capacitor containing core@shell polystyrene@graphene oxide microspheres for switchable removal of dyes from water by dielectrophoresis force

引用

Separation and Purification Technology 2024年 331卷

作者： Chen, Wei-Liang Cheng, Chih-Chia Lu, Chien-Hsing Chen, Jem-Kun Department of Materials Science and Engineering National Taiwan University of Science and Technology 43 Sec. 4 Keelung Road Taipei 106 Taiwan Division of Gastroenterology and Hepatology Department of Internal Medicine Chung Shan Medical University Hospital Taichung City402 Taiwan Graduate Institute of Applied Science and Technology National Taiwan University of Science and Technology Taipei10607 Taiwan Department of Obstetrics and Gynecology Taichung Veterans General Hospital Taichung40705 Taiwan Institute of Biomedical Sciences Ph.D. Program in Translational Medicine and Rong-Hsing Research Center for Translational Medicine National Chung-Hsing University Taichung940227 Taiwan

Absorption rates for traditional adsorbents were predominately determined by the concentration gradient from bulk to absorbents and surface area. A novel sandwich-structured capacitor (SSC) containing adsorbents is designed to reduce the time consuming of absorption of pollutants by dielectrophoresis force (FDEP). Graphene oxide (GO) are coated on polystyrene microspheres (PSs) as the core/shell PS@GO adsorbents that were encapsulated within the SSC to treat the solution of dye-emulsified micells (DEM). The FDEP results the assembling of PS@GOs and DEMs under polarization and enhance the adsorption rate ca. 1 ∼ 2 times with polarization at 3 V and 200 kHz. Additionally, most adsorbents are recycled with secondary pollution. Only two-fifth pure water volume of the wastewater through the SSC could achieve the recycling of the adsorbents at 900 kHz. The high complex permittivity of GO coating at high frequency allows ultrafast alternative spinning of the induced dipoles in the PS@GOs facilitates desorption and hinders the re-adsorption of the DEM during the recycling of PS@GOs. The PS@GOs was reused ca. 10 times at 20 mL min−1 of flow rate through the SSC without damages between 200 and 900 kHz. The designed SSC containing PS@GOs accomplishes either reusing of adsorbents or concentrating of dyes with low secondary pollution in practice through frequency manipulation. © 2023 Elsevier B.V.

关键词： Graphene

来源：评论

学校读者我要写书评

暂无评论

Polarization transport in ferroelectrics

引用

Physical Review Applied 2023年第5期20卷 050501-050501页

作者： G.E.W. Bauer P. Tang R. Iguchi J. Xiao K. Shen Z. Zhong T. Yu S.M. Rezende J.P. Heremans K. Uchida WPI Advanced Institute for Materials Research and CSIS Tohoku University 2-1-1 Katahira Sendai 980-8577 Japan Institute for Materials Research Tohoku University 2-1-1 Katahira Sendai 980-8577 Japan Kavli Institute for Theoretical Sciences University of the Chinese Academy of Sciences Beijing 10090 China National Institute for Materials Science Tsukuba 305-0047 Japan Department of Physics and State Key Laboratory of Surface Physics Fudan University Shanghai 200433 China Center for Advanced Quantum Studies and Department of Physics Beijing Normal University Beijing 100875 China Ningbo Institute of Materials Technology and Engineering Chinese Academy of Sciences Ningbo 315201 China China Center of Materials Science and Optoelectronics Engineering University of the Chinese Academy of Sciences Beijing 100049 China School of Physics Huazhong University of Science and Technology Wuhan 430074 China Departamento de Física Universidade Federal de Pernambuco Recife Pernambuco 50670-901 Brazil Department of Materials Science and Engineering The Ohio State University Columbus Ohio 43210 USA Department of Mechanical and Aerospace Engineering The Ohio State University Columbus Ohio 43210 USA Department of Physics The Ohio State University Columbus Ohio 43210 USA

The duality between electric and magnetic dipoles in electromagnetism only partly applies to condensed matter. In particular, the elementary excitations of the magnetic and ferroelectric orders, namely magnons and ferrons, respectively, have received asymmetric attention from the condensed matter community in the past. In this Perspective, we introduce and summarize the current state of the budding field of “ferronics.” We argue that the introduction of dipole-carrying elementary excitations allows the modeling of many observables and potentially leads to applications in thermal, information, and communication technologies.

关键词： Electric polarization Ferroelectricity Magnons Phonons Quasiparticles & collective excitations Transport phenomena Devices Ferroelectrics

来源：评论

学校读者我要写书评

暂无评论

Thin curved optics and the Twyman effect

Thin curved optics and the Twyman effect

引用

Optical Fabrication and Testing, OFT 2021 - Part of OSA Optical Design and Fabrication 2021

作者： Lakshmanan, Sanjay N. Lambropoulos, John C. Department of Mechanical Engineering University of Rochester RochesterNY14627 United States Materials Science Program University of Rochester RochesterNY14627 United States Laboratory for Laser Energetics University of Rochester RochesterNY14627 United States

We use numerical simulations and analytical techniques to assess the role of local thickness nonuniformity and curvature in the Twyman effect. A flat optic of similar thickness is used as a convenient metric for compa...

ISBN: (纸本)9781557528209

关键词：

来源：评论

学校读者我要写书评

暂无评论

Effect of Surface Activation on the Corrosion Resistance of a MAO/Ni-P Composite Coating on LZ91 Magnesium Alloy

引用

Journal of the Taiwan Institute of Chemical Engineers 2023年 147卷

作者： Chen, Chi-An Lee, Jeou-Long Jian, Shun-Yi Lee, Chia-Yu Ger, Ming-Der Combination Medical Device Technology Division Medical Devices R&D Service Department Metal Industries Research & Development Centre Kaohsiung802 Taiwan Department of Chemical and Materials Engineering Lung Hwa University of Science and Technology Taoyuan330 Taiwan Department of Material Engineering Ming Chi University of Technology New Taipei City Taiwan Center for Plasma and Thin Film Technologies Ming Chi University of Technology New Taipei Taiwan Graduate School of Defense Science Chung Cheng Institute of Technology National Defense University Taoyuan Taiwan Department of Chemical & Materials Engineering Chung Cheng Institute of Technology National Defense University Taoyuan Taiwan System Engineering and Technology Program National Chiao Tung University Hsin-Chu Taiwan

Background: LZ91 Magnesium alloy with a dual-phase structure has improved mechanical properties and a low density of about 1.48 g/cm3 but their limited resistance to corrosion limits their application. Therefore, it is a great challenge to increase the stability of LZ91 alloys under corrosive factors and environments. Methods: This study uses micro-arc oxidation (MAO) and an electroless nickel-phosphorus (Ni-P) plated composite film to increase the corrosion resistance of LZ91 magnesium alloy. Before electroless Ni-P plating, the MAO layers are activated by palladium catalysts at different pH values to produce composite coatings. SEM, EDS and Image J are used to determine the surface properties and elemental composition of the samples. The corrosion resistance is measured using a potentiodynamic polarization test and electrochemical impedance spectroscopy (EIS) in 3.5 wt.% NaCl solution. Findings: The results show that the MAO coating is activated by an acid catalyst and the surface is obviously corroded. The electroless Ni-P plating grows into the MAO coating and the substrate corrodes. Therefore, corrosive medium (chloride ion) easily enter to the substrate and pitting corrosion occurred. On the contrary, activation by a neutral catalyst (pH=7) maintains the original structure of the MAO coating and provides a good bonding interface for the Ni-P coating. Form the potentiodynamic analysis can be finds that the corrosion potential for the neutral catalyst treated sample is -0.35V and the corrosion current density value is 1.77×10−6 A/cm2, so the corrosion characteristic become better than the acid catalyst treated samples. In terms of the long-term resistance after 48 h, EIS analysis shows that the resistance value remains at about 7.6×104 Ω•cm2. A composite coating that is compact and with excellent resistance to corrosion resistance is produced, which provides better protection for LZ91 magnesium alloys. © 2023 Taiwan Institute of Chemical Engineers

关键词： Corrosion resistance

来源：评论

学校读者我要写书评

暂无评论

Drivers of the Patterns and Trends in Indian Household Carbon Footprints of Rural and Urban Areas

SSRN

引用

SSRN 2022年

作者： Sri, Priyanka Banerjee, Rangan Inter-Disciplinary Program in Climate Studies Indian Institute of Technology Bombay Mumbai400 076 India Department of Energy Science and Engineering Indian Institute of Technology Bombay Mumbai400 076 India Department of Energy Science and Engineering Indian Institute of Technology Delhi Delhi110 016 India

Understanding the role of household carbon footprints in a country’s emissions has been a crucial yet neglected area in climate change research. In this study, we provide estimates of Indian household carbon footprints (HCFs) for income quintiles belonging to rural and urban regions, while our aim is to understand the drivers of the patterns (between and within region) and trends (over time) in the same. For this, the constant price Environmentally extended Input-Output (EE-IO) data for the years 2003-04, 2007-08, 2013-14, and 2015-16 of the Indian economy, which is augmented with micro-economic data based on national household surveys, is subjected to Input-Output analysis (IOA) and Structural Decomposition Analysis (SDA). Also, annual Environmental Engel Curves (EECs) describing expenditure-emissions relationships are plotted separately for rural and urban households for the end years. It allowed the decomposing of differences in mean rural and urban HCFs across regions and time using the regression-based Oaxaca-Blinder Decomposition (OBD) approach. For 2015-16, we find the households of the richest rural quintile emitting five times more than the lowest quintile, while for the urban counterparts, the disparity is more than seven times. Over time, HCFs increased mainly due to increasing per capita expenditures and population despite being offset by emission intensity changes. The role of different consumption categories is highlighted. Also, we observe a decline in emissions intensities with affluence increase across the cross-section of households from both the areas and time periods. While the household income was found to explain most of the differences in mean emissions between regions and across time, the lifestyle changes suggest comparatively climate unfriendly behaviour of households over time and in rural regions when we control for affluence differences. Suggestions toward carbon mitigation through sustainable consumption and the fairness implications of

关键词： Carbon footprint

来源：评论

学校读者我要写书评

暂无评论

Bulk passivation of perovskite films utilizing halide anion ionic liquids

引用

International Journal of Thermofluids 2023年 20卷

作者： Alashkar, Adnan Ayoub, Mohamad Ibrahim, Taleb Khamis, Mustafa Nancarrow, Paul Alami, Abdul Hai Tabet, Nouar PhD Program in Materials Science and Engineering American University of Sharjah Sharjah 26666 United Arab Emirates Sustainable and Renewable Energy Engineering Department University of Sharjah Sharjah 27272 United Arab Emirates Sustainable Energy & Power Systems Research Centre RISE University of Sharjah Sharjah 27272 United Arab Emirates Department of Chemical Engineering American University of Sharjah Sharjah 26666 United Arab Emirates Department of Biology Chemistry and Environmental Sciences College of Arts and Sciences American University of Sharjah Sharjah 26666 United Arab Emirates Center for Advanced Materials Research Research Institute of Science and Engineering University of Sharjah Sharjah 27272 United Arab Emirates Department of Applied Physics and Astronomy University of Sharjah Sharjah 27272 United Arab Emirates

Chemical additives to perovskite precursors constitute a predominant route to passivate defects in perovskite films and improve carrier charge dynamics. In this work, ionic liquids (ILs) with chloride and iodide anions are used as additives for bulk passivation of perovskite films. The ionic liquids in the form of 1‑butyl‑4-methylpyradinium iodide (IL-I) and 1-ethylimidazolium chloride (IL-Cl) are mixed individually with a precursor of Cesium Formamidinium Lead Triiodide and Methylammonium Chloride (CsFAPbI3−MACl). The decay of charge carriers within the perovskite film before and after passivation with ILs was measured by Time Resolved Photoluminescence Spectroscopy (TRPL). The effect of added ILs on the recombination rate of the photocarriers was investigated by analyzing the decay of the TRPL signal in all samples. The average lifetimes obtained within one day of preparations were 79 ns, 73 ns and 275 ns for pristine perovskite, IL-I passivated perovskite and IL-Cl passivated perovskite films, respectively. These values show that the presence of the IL with chloride anion greatly improves the average lifetime of the charge carrier by around 250%, while IL with iodide anion decreased the lifetime by 32% as compared with the pristine perovskite sample. This finding renders the IL-Cl passivated perovskite films as a valuable resource in applications ranging from photoelectric to hydrogen generation devices. © 2023

关键词： Ionic liquids

来源：评论

学校读者我要写书评

暂无评论

Solid waste management in the paper industry 5

Solid waste management in the paper industry

引用

5th International Conference on Energy, Environmental and Information System, ICENIS 2020

作者： Devichi Wibowo, Isabella Purwanto, P. Suherman, S. Master Program of Environmental Science Post-Graduate Studies Universitas Diponegoro Semarang Indonesia Department of Chemical Engineering Faculty of Engineering Universitas Diponegoro Semarang Indonesia

The industry developed rapidly since the Industrial Revolution in the 18th century. The side effect of industrial development was a large amount of non-hazardous waste and hazardous waste. All of this waste must be managed properly so that environmental sustainability is maintained and does not cause harm or problems to the community. A review will be conducted from various research journals in various countries and the types of waste also vary, namely plastic, pulp and paper industry waste, and other solid waste. A comparison of solid waste management will be carried on to reduce the generation of waste in the environment. © The Authors, published by EDP sciences, 2020.

关键词： Solid wastes

来源：评论

学校读者我要写书评

暂无评论

Rice Variety Identification Using Edge Feature Extraction and Texture-Based Segmentation

Rice Variety Identification Using Edge Feature Extraction an...

引用

International Seminar on Application for Technology of Information and Communication (ISemantic)

作者： Aji Setiawan Kusworo Adi Catur Edi Widodo Doctoral Program of Information Systems School of Postgraduate Studies Diponegoro University Semarang Indonesia Department of Information Technology Faculty of Engineering Darma Persada University Jakarta Indonesia School of Postgraduate Studies Diponegoro University Semarang Indonesia Department of Physics Faculty of Science and Mathematics Diponegoro University Semarang Indonesia

This research proposes a methodology for identifying the optimal feature combination using Support Vector Machine (SVM) based on edge and texture features. Canny, Sobel, and Prewitt for edge detection and GLCM, Gabor, and LBP for texture analysis are popular feature extraction techniques widely employed in various cases. The approach combines edge and texture features with SVM to classify rice types into five categories: Ipsala, Jasmine, Karacadag, Arborio, and Basmati. Experimental results demonstrate that SVM using Canny, Sobel, and Prewitt combined Gabor texture features outperforms the comparative methods. A comparative analysis based on accuracy scores using confusion matrices is conducted. Combining all feature edge methods, Canny, Sobel, and Prewitt with Gabor on SVM classification is the best model for rice object classification, achieving an accuracy of 96%.

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：