检索结果-内蒙古大学图书馆

Preparation of graphitic carbon nitride (g-C3N4) for novel dielectric and photocatalytic dye removal applications

Physica Scripta 2023年第9期98卷 095904-095904页

作者： Gupta, Aayush Jaidka, Sachin Rajagopalan, Pandey Mehtani, Hitesh Kumar Singhal, Varun Pandey, O.P. Department of Mechanical Engineering GLA University Uttar Pradesh Mathura281406 India School of Physics and Materials Science Thapar Institute of Engineering and Technology Punjab Patiala147004 India Cross College of Elite Program National Cheng Kung University Tainan70101 Taiwan Mechanical Engineering Department Thapar Institute of Engineering and Technology Punjab Patiala147004 India

Recent developments in 2D nanomaterials have greatly expanded their use in engineering applications. Graphitic carbon nitride (g-C3N4) shows a combination of electrical conductivity, sensing and luminescence abilities, biocompatibility, and chemical stability. The present study showcases the effectiveness of g-C3N4 as a photocatalyst for removing various organic molecules from water (such as methylene blue, 4-nitrophenol, and pharmaceutical drugs) and its potential use in dielectric applications when combined with an organic polymer (polyvinylidene fluoride;PVDF). XRD patterns confirmed the formation of g-C3N4 (which is complimented by the UV-Visible and FTIR results) and PVDF-g-C3N4 composite film. SEM-EDS verified the chemical homogeneity of the as-prepared g-C3N4 powder. Maximum photocatalytic degradation was observed for methylene blue dye (96.48%) with a half-life of 24.18 min, whereas the least degradation was detected for hydroxychloroquine (53.10%) with a half-life of 90.12 min after 120 min of UV-visible exposure. 10 wt% C3N4 reinforced PVDF thick films exhibited stable dielectric properties at low temperature (below 60°C) as compared to PVDF alone. At 1 kHz, the dielectric permittivity and tangent loss of the PVDF-g-C3N4 composites come out to be ∼6 and ∼0.05, respectively (at room temperature). The AC conductivity and activation energy of the synthesized composite was also studied. © 2023 IOP Publishing Ltd

关键词： Organic pollutants

来源：评论

学校读者我要写书评

暂无评论

Autonomous Electron Tomography Reconstruction Using Bayesian Optimization

引用

Microscopy and microanalysis : the official journal of Microscopy Society of America, Microbeam Analysis Society, Microscopical Society of Canada 2023年第1期29卷 1915-1916页

作者： Millsaps, William Schwartz, Jonathan Di, Zichao Wendy Jiang, Yi Hovden, Robert Department of Nuclear Engineering Radiological Sciences University of Michigan Ann Arbor MI United States Department of Materials Science and Engineering University of Michigan Ann Arbor MI United States Mathematics and Computer Science Division Argonne National Laboratory Lemont IL United States Advanced Photon Source Facility Argonne National Laboratory Lemont IL United States Applied Physics Program University of Michigan Ann Arbor MI United States

来源：评论

学校读者我要写书评

暂无评论

Levelized Cost Computation of Novel Thermoelectric Modules 2nd

Levelized Cost Computation of Novel Thermoelectric Modules

引用

2nd International Conference on Recent Advances in mechanical engineering, RAME 2020

作者： Mane, Pradyumn Atheaya, Deepali Engineering Physics Department School of Engineering and Applied Sciences Bennett University Tech Zone-II Greater Noida UP201310 India Mechanical and Aerospace Engineering Department School of Engineering and Applied Sciences Bennett University Tech Zone-II Greater Noida UP201310 India

ISBN: (纸本)9789811596773

In this research paper, the cost analysis of novel thermoelectric modules has been proposed. Thermoelectric material cost, thermoelectric manufacturing cost and areal manufacturing cost of novel thermoelectric modules were taken into consideration to analyze the capital cost of novel thermoelectric modules. Cost-performance metric for the proposed novel thermoelectric modules was analyzed. Levelized cost of electricity was calculated for TEG integrated thermal power plant and compared with traditional thermal power plant. Solar, wind and battery technologies were compared with thermoelectric generator on the basis of capital cost, area occupancy, weight and carbon footprints. The results indicated that Pb1−xMgxTe0.8Se0.2 and CoSb3−xTex-based thermoelectric generator has the lowest cost-performance metric. It also indicated that the levelized cost of energy decreases by 82.4% in TEG integrated thermal power plant as compared to non-integrated thermal power plant. The proposed TEG weighs less than a battery occupies less space than solar panels and is a reliable renewable technology. © 2021, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： Cost analysis Cost-performance metric Levelized cost of energy Thermoelectric module

来源：评论

学校读者我要写书评

暂无评论

Emergent facilitation by random constraints in a facilitated random walk model of glass

引用

Physical Review E 2025年第4期111卷 044120-044120页

作者： Leo S. I. Lam Hai-Yao Deng Wei-Bing Zhang Udoka Nwankwo Chu Xiao Cho-Tung Yip Chun-Shing Lee Haihui Ruan Chi-Hang Lam Department of Mechanical Engineering Hong Kong Polytechnic University Hong Kong China School of Physics and Astronomy Cardiff University 5 The Parade Cardiff CF24 3AA Wales United Kingdom School of Physics and Electronic Sciences Changsha University of Science and Technology Changsha 410004 China Department of Physics Harbin Institute of Technology Shenzhen 518055 China Department of Applied Physics Hong Kong Polytechnic University Hong Kong China

The physics of glass has been a significant topic of interest for decades. Dynamical facilitation is widely believed to be an important characteristic of glassy dynamics, but the precise mechanism is still under debate. We propose a lattice model of glass called the facilitated random walk (FRW). Each particle performs a continuous time random walk in the presence of its own random local kinetic constraints. The particles do not interact energetically. Instead, they interact kinetically with a hopping rate resampling rule under which motions of a particle can randomly perturb the local kinetic constraints of other particles. This dynamic interaction is reversible, following a rate restoration rule. A step-by-step reversal of the particle motions exactly restores the previous constraints, modeling randomness quenched in the configuration space of glass. The model exhibits stretched exponential relaxation and dynamical heterogeneity typical of glasses. Despite the lack of an explicit facilitation rule, the FRW shows facilitation behaviors closely analogous to those of the kinetically constrained models (KCM). The FRW is a coarse-grained version of the distinguishable particle lattice model (DPLM) and this exemplifies that compatible defect and atomistic models can complement each other in the study of glass.

关键词： Restoration

来源：评论

学校读者我要写书评

暂无评论

Nitridation Effects of a GaAs Epitaxial Layer on Extending of the Decay Time of Terahertz Electromagnetic Waves Emitted from Coherent Longitudinal Optical Phonons Observed with the Use of Terahertz Time-Domain Spectroscopy

Nitridation Effects of a GaAs Epitaxial Layer on Extending o...

引用

International Conference on Infrared and Millimeter Waves

作者： Hideo Takeuchi Kai Matsunaga Yusuke Sengi Jared Mitchell Rachel Goldman Department of Physics and Elecronics Osaka Metropolitan University (formerly Osaka City University) Osaka Japan Department of Applied Physics Osaka City University (Currently Osaka Metropolitan Univ.) Osaka Japan Applied Physics Program University of Michigan Ann Arbor Michigan U.S.A. Materials Science and Engineering University of Michigan Ann Arbor Michigan U.S.A.

ISBN: (数字)9798350370324

ISBN: (纸本)9798350370331

We observed that, in an undoped GaAs 1-x N x single epilayer, terahertz electromagnetic waves from coherent GaAs-like longitudinal optical (LO) phonons have a long decay time in comparison with terahertz waves from coherent LO phonons in a GaAs single crystal. We attributed the origin of the present phenomena to the fact photogenerated electron-LO-phonon scattering is suppressed owing to reduction of the ultrafast photocurrent acceleration that originates both from relatively large electron effective mass caused by the band anticrossing and from the alloying effect due to the nitridation.

关键词： Spectroscopy Stimulated emission Epitaxial layers Gallium arsenide Phonons Ultrafast optics Optical scattering Photoconductivity Time-domain analysis Electrons

来源：评论

学校读者我要写书评

暂无评论

Analytical Terahertz Wave Absorption Spectroscopy of Dimethyl Ether

Analytical Terahertz Wave Absorption Spectroscopy of Dimethy...

引用

International Conference on Infrared and Millimeter Waves

作者： Ingrid Wilke Megan N. Powers Tim E. Rice Arshad Chowdhury Muhammad Waleed Mansha Mona M. Hella Matthew A. Oehlschlaeger Department of Physics Applied Physics & Astronomy Rensselaer Polytechnic Institute Troy NY USA Department of Mechanical Nuclear & Aeronautical Engineering Rensselaer Polytechnic Institute Troy NY USA Department of Electrical Computer & Computer System Engineering Rensselaer Polytechnic Institute Troy NY USA

Terahertz (THz) wave rotational absorption spectra of dimethyl ether (DME) are reported. Measurements have been performed at room temperature and pressures of 1 to 8 Torr (1.22 to 10.67 mbar) in the 220 to 330 GHz frequency band using an electronic THz wave spectrometer. Observed rotational transition frequencies and absorption strengths are in good agreement with literature and extends prior work to conditions where considerable pressure broadening occurs. A room temperature collisional self-broadening coefficient of 12.1 GHz bar -1 for DME is derived. The potential of THz wave absorption measurements for quantitative DME gas sensing in industry and the environment is demonstrated.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Acoustic Droplet Vaporization for On-Demand Modulation of Microporosity in Smart Hydrogels

SSRN

引用

SSRN 2023年

作者： Aliabouzar, Mitra Quesada, Carole Chan, Ze Qi Fowlkes, Jeffry Brian Franceschi, Renny T. Putnam, Andrew J. Fabiilli, Mario L. Department of Radiology University of Michigan Ann ArborMI United States Department of Mechanical Engineering University of Michigan Ann ArborMI United States Department of Biomedical Engineering University of Michigan Ann ArborMI United States Applied Physics Program University of Michigan Ann ArborMI United States

Microporosity in hydrogels is critical for directing tissue formation and function. We have developed a fibrin-based smart hydrogel, termed an acoustically responsive scaffold (ARS), which responds to focused ultrasound in a spatiotemporally-controlled, user defined manner. ARSs are highly flexible platforms due to the inclusion of phase-shift emulsions and their tunable response to ultrasound through a mechanism termed acoustic droplet vaporization (ADV). Here, we demonstrated that ADV enabled consistent generation of micropores in ARSs, throughout the entire thickness (~5.5 mm), using a perfluorooctane phase-shift emulsion. Size characteristics of micropores were quantified in response to critical parameters including acoustic properties, emulsion size, and shear elastic modulus of fibrin using confocal microscopy. The findings showed that the median major axis length of the generated micropores correlated directly with excitation frequency, peak rarefactional pressure, pulse duration, size of the emulsion, and indirectly with the shear elastic modulus of the fibrin matrix. The ADV-generated micropores in ARSs were further compared with cavitation-mediated micropores in fibrin gels without emulsions. Additionally, the Keller-Miksis equation was used to predict an upper bound for micropore formation in ARSs at varying driving frequencies and emulsion sizes. Finally, our in vivo studies showed significant, frequency-dependent host cell migration (up to 2.6 fold higher at a lower frequency) in implanted ARSs following ADV-induced micropore formation. Overall, these findings demonstrate a new potential application of ADV in hydrogels. © 2023, The Authors. All rights reserved.

关键词： Ultrasonics

来源：评论

学校读者我要写书评

暂无评论

Eco-friendly synthesis, characterization, and antimicrobial studies of Zinc oxide nanoparticles using Cassia Javanica Leaf extract

Eco-friendly synthesis, characterization, and antimicrobial ...

引用

Science, engineering and Business for Sustainable Development Goals (SEB-SDG), International Conference on

作者： Taiwo Felicia Owoeye Abayomi Bamisaye Emetere Moses Eterigho Sunday A. Afolalu Stella Isioma Monye Ojo Augustine Oluwatoyin Department of Chemical Sciences Lead City University Ibadan Department of Chemistry Covenant University Sango-Ota Department of Chemical Sciences Faculty of Natural and Applied Sciences Lead City University Ibadan Nigeria Department of Physics Faculty of Engineering BOWEN University Iwo Nigeria Department of Mechanical and Mechatronics Engineering Afe Babalola University Ado-Ekiti Nigeria Department of Mechanical Engineering Science University of Johannesburg South Africa Department of Mechanical and Mechatronics Department Afe Babalola University Ado-Ekiti Nigeria Mechanical and Mechatronics Afe Babalola University Ado-Ekiti Nigeria

ISBN: (数字)9798350358155

ISBN: (纸本)9798350358162

The green approach for metal oxide Nanoparticles (NPs) synthesis is a current discuss in material science and nanotechnology, which is quick, simple, cost-effective, and environmentally friendly. This study aims at the biogenic zinc oxide nanoparticles synthesis (ZnONPs) using Cassia Javanica leaf extracts and Analyzing its antibacterial properties activities; Zones of Inhibition (ZI) and Minimum Inhibitory Concentration (MIC) on Salmonella, Candida, Escherichia coli, Staphylococcus, and Pseudomonas aeruginosa. The ZnONPs were characterized using a UV-Vis spectrophotometer, XRD, FTIR, EDX, and SEM. The FTIR shows that the metal oxide nanoparticle wavenumber was at 700cm -1 , which was corroborated by EDX chemical *** show spherical crystalline nanoparticles having an average size of particles of 41.85 nm. The recorded ZI values for Salmonella, Candida, Escherichia coli, Staphylococcus, and Pseudomonas aeruginosa are 32.00, 48.00, 0.00, 34.00 and 40.00 mm respectively. Also, the MIC for Salmonella, Candida, Escherichia coli, Staphylococcus, and Pseudomonas aeruginosa are 7.81, 3.90, 0.00, 31.25 and 7.81 mg/mL respectively. The findings of this study revealed the antimicrobial properties of Zinc oxide nanoparticles (ZnONPs) using Cassia Javanica leaf extract suggesting that it is a possible contender for use in biomedical applications.

关键词： Nanoparticles Salmonella Microwave integrated circuits Materials science and technology X-ray scattering Metals Escherichia coli

来源：评论

学校读者我要写书评

暂无评论

Measuring kinetic inductance and superfluid stiffness of two-dimensional superconductors using high-quality transmission-line resonators

arXiv

引用

arXiv 2024年

作者： Kreidel, Mary Chu, Xuanjing Balgley, Jesse Antony, Abhinandan Verma, Nishchhal Ingham, Julian Ranzani, Leonardo Queiroz, Raquel Westervelt, Robert M. Hone, James Fong, Kin Chung School of Engineering and Applied Sciences Harvard University CambridgeMA02138 United States Department of Applied Physics and Applied Mathematics Columbia University New YorkNY10027 United States Department of Mechanical Engineering Columbia University New YorkNY10027 United States Department of Physics Columbia University New YorkNY10027 United States RTX BBN Technologies Quantum Engineering and Computing Group CambridgeMA02138 United States Center for Computational Quantum Physics Flatiron Institute New YorkNY10010 United States Department of Physics Harvard University CambridgeMA02138 United States

The discovery of van der Waals superconductors in recent years has generated a lot of excitement for their potentially novel pairing mechanisms. However, their typical atomic-scale thickness and micrometer-scale lateral dimensions impose severe challenges to investigations of pairing symmetry by conventional methods. In this report we demonstrate a new technique that employs high-quality-factor superconducting resonators to measure the kinetic inductance-up to a part per million-and loss of a van der Waals superconductor. We analyze the equivalent circuit model to extract the kinetic inductance, superfluid stiffness, penetration depth, and ratio of imaginary and real parts of the complex conductivity. We validate the technique by measuring aluminum and finding excellent agreement in both the zero-temperature superconducting gap as well as the complex conductivity data when compared with BCS theory. We then demonstrate the utility of the technique by measuring the kinetic inductance of multi-layered niobium diselenide and discuss the limits to the accuracy of our technique when the transition temperature of the sample, NbSe2 at 7.06 K, approaches our Nb probe resonator at 8.59 K. Our method will be useful for practitioners in the growing fields of superconducting physics, materials science, and quantum sensing, as a means of characterizing superconducting circuit components and studying pairing mechanisms of the novel superconducting states which arise in layered 2D materials and heterostructures. © 2024, CC BY-NC-SA.

关键词： Van der Waals forces

来源：评论

学校读者我要写书评

暂无评论

Study the possibility of implementing a solar chimney power plant in algeria (Case study: Constantine)

Renewable Energy and Power Quality Journal

引用

Renewable Energy and Power Quality Journal 2021年 19卷 103-108页

作者： Djimli, S. Chaker, A. Boukelia, T.E. Ghellab, A. Bouraoui, A. Laboratory of Applied Energies and Materials Faculty of Sciences and the Technology University of Jijel Ouled Aissa BP 98 Algeria Mechanical Engineering Department Faculty of Sciences and the Technology University of Jijel Ouled Aissa BP 98 Algeria Energy Physics Laboratory Department of Physics University of Brothers Montouri Constantine1 Constantine Algeria Laboratory of Mechanical and Advanced Materials Polytechnic School of Constantine Constantine Algeria

This work offers the opportunity to consider the possibility of realizing a solar chimney power plant in the region of Constantine (Algeria). This region is characterized by its important solar radiation resource and ambient temperature. Based on actual measurements of Constantine weather station for the period of April 2020, the performance analysis of a solar chimney which have three times the dimensions of the Manzaneres prototype (Spain) is carried out using of Fluent software. The obtained results show that when the dimensions of the solar chimney are large, the impact of small changes in solar irradiation is negligible. Also, the studied power plant with dimensions of;584 m height, a diameter of 30 m and a collector diameter of 732 m is capable of producing a monthly average of 72 to 296 MW of electrical energy, this energy production would be sufficient to meet the needs of rural areas located in this region. © 2021, European Association for the Development of Renewable Energy, Environment and Power Quality (EA4EPQ). All rights reserved.

关键词： Solar chimneys

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：