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Microwave and Antenna Symposium (IMAS), International

作者： Josef Frankhouse Evans Addo-Mensah Uche Wejinya Department of Mechanical Engineering University of Arkansas - Fayetteville Materials Science and Engineering Graduate Program University of Arkansas - Fayetteville

ISBN: (数字)9798350356359

ISBN: (纸本)9798350356366

In this study, a Terahertz (THz) band antenna which can regulate its own resonant frequency without the requirement of manual adjustment is simulated. A polyvinylidene fluoride (PVDF) substrate is applied onto a rectangular graphene patch antenna. With a voltage potential applied onto the PVDF, the patch antenna can attenuate its frequency by physically changing the shape of the antenna, and in turn its resonant frequency. These antennas are within a 0.1 THz band between 1.32 THz to 1.22 THz measured from a radial bend of a flat surface to r = 75 μm, fitting into a return loss (S11) above -30 dB. Although the return loss did not show consistency, the resonating frequency shifted at a linear rate relative to the cylindrical bending.

关键词： Microwave antennas Patch antennas Graphene Resonant frequency Prototypes Bandwidth Bending Loss measurement Substrates Terahertz communications

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Effects of laser-peening parameters on plastic deformation of SUS316L

Effects of laser-peening parameters on plastic deformation o...

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31st International Congress on Applications of Lasers and Electro-Optics, ICALEO 2012

作者： Mizuta, Kohei Tsuyama, Miho Takahashi, Makoto Shibayanagi, Toshiya Nakano, Hitoshi Program in Electronic Engineering Interdisciplinary Graduate Faculty of Science and Engineering Kinki University 3-4-1 Kowakae Higashi-osaka Osaka 577-8502 Japan Joining and Welding Research Institute Osaka University 11-1 Mihoga-oka Ibaraki Osaka 567-0047 Japan Program in Materials Science and Engineering Faculty of Engineering Toyama University 3190 Gofuku Toyama Toyama 930-8555 Japan

Effects of laser-peening parameters on plastic deformation have been investigated through hardness measurements. The laser-peening parameter consisting of laser parameters, pressure of laser-produced plasma, propagation of laser-induced shock wave and initial state of target material should be optimized for efficient laser peening. The laser parameters are one of the important factor, thus laser intensity and coverage which corresponds to the number of laser shots irradiated per unit of area have been changed to estimate the laser peening effect in this study. Second harmonic of Nd:YAG laser having the pulse duration of 4 ns has been used. Commercial SUS316L stainless steel has been adopted as a sample. The samples were investigated under nanosecond laser-shock loading in plasma confined by water. Vickers microhardness is used to probe work hardening due to plastic deformation induced by laser peening. Through hardness measurements, it is found that desirable coverage for producing the plastic deformation has been existed, which depends on the laser irradiation intensity.

关键词： Plastic deformation

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Bioinspired graphene-based silver nanoparticles: Fabrication, characterization and antibacterial activity 11

Bioinspired graphene-based silver nanoparticles: Fabrication...

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11th National Conference on Solid State Chemistry and Allied Areas, NCSCA 2019

作者： Potbhare, Ajay K. Umekar, Mayuri S. Chouke, Prashant B. Bagade, Mahendra B. Tarik Aziz, S.K. Abdala, Ahmed A. Chaudhary, Ratiram G. Post Graduate Department of Chemistry Seth Kesarimal Porwal College of Arts Commerce and Science Kamptee441001 India Bar Ilan University Ramat-Gan52900 Israel Chemical Engineering Program Texas AandM University at Qatar POB 23784 Doha Qatar

Herein we present a fabrication and antibacterial assays of novel silver nanoparticles (Ag NPs) on the surface of graphene oxide (GO) nanosheets as a multifunctional antibacterial material by using Pseudomonas aeruginosa biomass extract the nanocomposites has fabricated. as a synthesized material were characterized by spectroscopic technique including XRD, FTIR, EDX, Raman and TEM. XRD analysis specified the cubic crustal structure of NCs, while TEM rendered an average particle size of 25»nm of Ag-GO NCs. As a result, the fabricated Ag-GO NCs was tested against gram-positive and gram-negative strains and the results shows the Ag-GO NCs to be more effective against gram-negative bacteria (***). © 2019 Elsevier Ltd.

关键词： Graphene

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Identifying Prognostic Markers of Non-small Cell Lung Carcinoma Using Bioinformatics

Identifying Prognostic Markers of Non-small Cell Lung Carcin...

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International Conference on Industrial Instrumentation and Control,ICI2C 2021

作者： Khan, Siladitya Chakraborty, Debamitra Department of Biomedical Engineering University of Rochester RochesterNY14627 United States Goergen Institute for Data Science University of Rochester RochesterNY14627 United States Materials Science Graduate Program University of Rochester RochesterNY14627 United States

ISBN: (纸本)9789811670107

We present a transcriptomics pipeline for performing the functional analysis of array expression profiling data of normal and adenocarcinoma lung tissue. Our aims are twofold, firstly to elucidate molecular processes that transform normal tissue, to a lung adenocarcinoma. Following this, we perform functional analysis to screen potential hub genes and demonstrate their value in cancer prognosis. Analysis was performed on a total of 500 differentially expressed genes (DEG), screened for their regulation and transcriptional modulation in a female population carrying non–small cell lung carcinoma (NSCLC). Key pathways like cytokine-cytokine receptors, ECM receptor interactions, and TNF signaling were identified suggesting a potential role in lung tumorigenesis. © 2022, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： Bioinformatics

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Retraction notice to "Personal protective equipment-derived pollution during Covid-19 era: A critical review of ecotoxicology impacts, intervention strategies, and future challenges" [Sci. Total Environ. 887(2023) 164164]

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The science of the total environment 2025年 967卷 178758页

作者： Mehedi Hasan Abu Reza Md Towfiqul Islam Most Mastura Munia Farjana Jion Md Naimur Rahman Susmita Datta Peu Arnob Das A B M Mainul Bari Md Saiful Islam Subodh Chandra Pal Aznarul Islam Tasrina Rabia Choudhury Md Refat Jahan Rakib Abubakr M Idris Guilherme Malafaia Department of Disaster Management Begum Rokeya University Rangpur 5400 Bangladesh. Department of Disaster Management Begum Rokeya University Rangpur 5400 Bangladesh Department of Development Studies Daffodil International University Dhaka 1216 Bangladesh. Department of Geography and Environmental Science Begum Rokeya University Rangpur 5400 Bangladesh. Department of Agriculture Hajee Mohammad Danesh Science and Technology University Dinajpur 5200 Bangladesh. Department of Mechanical Engineering Rajshahi University of Engineering & Technology 6 Rajshahi 6204 Bangladesh. Department of Industrial and Production Engineering Bangladesh University of Engineering and Technology Dhaka 1000 Bangladesh. Department of Soil Science Patuakhali Science and Technology University Dumki Patuakhali 8602 Bangladesh. Department of Geography The University of Burdwan Bardhaman 713104 West Bengal India. Department of Geography Aliah University 17 Gorachand Road Kolkata 700 014 West Bengal India. Analytical Chemistry Laboratory Chemistry Division Atomic Energy Centre Dhaka (AECD) Bangladesh Atomic Energy Commission Dhaka 1000 Bangladesh. Department of Fisheries and Marine Science Faculty of Science Noakhali Science and Technology University Noakhali Bangladesh. Department of Chemistry College of Science King Khalid University Abha 62529 Saudi Arabia Research Center for Advanced Materials Science (RCAMS) King Khalid University Abha Saudi Arabia. Post-Graduation Program in Conservation of Cerrado Natural Resources Goiano Federal Institute Urutaí GO Brazil Post-Graduation Program in Ecology Conservation and Biodiversity Federal University of Uberlândia Uberlândia MG Brazil Post-Graduation Program in Biotechnology and Biodiversity Federal University of Goiás Goiânia GO Brazil.

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Which glass stability parameters can assess the glass-forming ability of oxide systems?

arXiv

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arXiv 2020年

作者： Jiusti, Jeanini Cassar, Daniel R. Zanotto, Edgar D. Department of Materials Engineering Federal University of São Carlos Graduate Program in Materials Science and Engineering São Carlos SP Brazil

Glass forming ability (GFA) is a property of utmost importance in glass science and technology. In this paper, we used a statistical methodology-involving bootstrap sampling and the Wilcoxon test-to find out which glass stability parameters can better predict the glass forming ability. We collected or measured the necessary data for twelve stoichiometric oxide glasses that underwent predominant heterogeneous nucleation (the most common case). We found that some GS parameters could predict the GFA of these oxide glasses quite well, whereas others perform poorly. Parameter Kw was the top ranked, closely followed by the KH, γ, H', ΔTrg, and Kcr. Our results corroborate previous reports carried out using a smaller number of glasses, much less GS parameters, and less rigorous statistics. We also found that using Tc instead of Tx improved the predictive power of these parameters. Finally, the Jezica, the only parameter considered here that predicts the GFA without requiring the production of a glass piece (i.e., without relying on any crystallization information), ranked reasonably well in our analysis. Copyright © 2020, The Authors. All rights reserved.

关键词： Nucleation

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Eco-Friendly Energy Storage and Energy Harvesting Devices Fabricated by Direct Laser Writing of Chitosan-Lignin-Boric Acid Substrates

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ACS Applied Electronic materials 2025年

作者： Islam, Jahidul Silva, Rafael Resende Assis Imbrogno, Alessandra Otoni, Caio G. Martins, Rodrigo Capparelli Mattoso, Luiz Henrique Quinn, Aidan J. Iacopino, Daniela Tyndall National Institute University College Cork Cork T12 R5CP Ireland Graduate Program in Materials Science and Engineering (PPGCEM) Federal University of São Carlos (UFSCar) SP São Carlos 13565-905 Brazil CENIMAT i3N Department of Materials Science NOVA School of Science and Technology NOVA University Lisbon (FCT-NOVA) CEMOP UNINOVA Caparica 2829-516 Portugal National Nanotechnology Laboratory for Agribusiness Embrapa Instrumentação SP São Carlos 13560-970 Brazil Institute of Chemistry University of Campinas (UNICAMP) SP Campinas 13083-970 Brazil

Eco-friendly supercapacitor (SC) and triboelectric nanogenerator (TENG) devices were assembled using laser-induced graphene (LIG) electrodes fabricated by direct laser writing of chitosan-lignin-boric acid films. A simple one-step laser irradiation was used to convert the chitosan-based films into 3D, interlinked, and electrically conductive LIG electrode materials. Assembled SCs displayed specific areal capacitances up to 21.4 mF/cm² at a current density of 0.05 mA/cm² and 68% capacitance retention for >10,000 charge/discharge cycles. When charged by a commercial solar cell, the SC could power a digital thermo-hygrometer, an electronic stopwatch and a calculator, showing potential for real applications. Single-electrode TENG (SE-TENG) devices were also assembled using PDMS as the dielectric layer. The TENGs displayed an open-circuit voltage of 13.3 V, a short-circuit current of 1.7 μA, and stability over 10,000 cycles. The TENG could charge commercial SCs of 0.1 and 1 μF capacitance in less than 60 s. This work demonstrates the suitability of sustainable materials as feedstock constituents for the generation of LIG electrodes and opens the door to the large-scale production of cost-effective electrode materials for “green” wearable electronic applications. © 2025 The Authors. Published by American Chemical Society.

关键词： biodegradable device energy harvesting laser-induced graphene supercapacitor sustainable materials triboelectric nanogenerator wearable electronics

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Consolidation of the Cu46Zr42Al7Y 5 amorphous ribbons and powder alloy by hot extrusion

Consolidation of the Cu46Zr42Al7Y 5 amorphous ribbons and po...

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作者： Melle, Ana Karla Peres, Mauricio Mhirdaui Bolfarini, Claudemiro Botta, Walter José Jorge Jr., Alberto Moreira Kiminami, Claudio Shyinti Science and Materials Engineering Post Graduation Program Department of Materials Engineering Federal University of São Carlos - UFSCar Rod. Washington Luiz Km 235 CEP 13565-905 São Carlos SP Brazil Federal University of Itajubá - UNIFEI Rua São Paulo 377 CEP 37500 903 Itabira MG Brazil

The amorphous Cu46Zr42Al7Y5 alloy presents large supercooled liquid region (ΔTX = 100 K), with a viscosity of about 106 N.s/m2 where the material can flow as a liquid, making it possible an easy deformation in this temperature region. The aim of this work was to analyze processing routes to produce bulks of metallic glasses. Two kinds of materials were used: amorphous powders and ribbons, both were consolidated by hot extrusion in temperatures inside the range between Tg and Tx, with a ram speed of 1 mm/min and extrusion ratio of 3 : 1. Analysis of X-Ray Diffratometry (XRD), Differential Scanning Calorimetry (DSC) and Scanning Electron Microscopy (SEM), revealed that the proposed consolidation routes were effective to produce large bulks of amorphous materials, even with the strong decreasing of ΔTX observed after deformation by milling and during extrusion.

关键词： Metallic glass

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Pressure Assisted Crystallization of MnAl Thin Films

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MRS Online Proceedings Library (OPL) 2011年第1期695卷 L13.5.1-L13.5.1页

作者： Gregory A. Fischer M. Lea Rudee Vitali F. Nesterenko Sastry Indrakanti Graduate Program in Materials Science/Center for Magnetic Recording Research University of California at San Diego La Jolla CA. 92093-0401 Graduate Program in Materials Science/Department of Mechanical and Aerospace Engineering University of California at San Diego La Jolla CA. 92093-0411

The effect of hot isostatic pressure processing (HIP) on MnAl films has been compared to vacuum annealing for the purpose of obtaining substantial amounts of tau phase MnAl in films under 200 nm. Films were deposited by dc sputtering from both MnAlNiC an MnAl targets. As-deposited films were nearly amorphous. post deposition annealing in vacuum produced only small amounts of the ferromagnetic tau-phase in films thinner than 200 *** all instances, regardless of substrate and sputtering target, the use of HIP in place of vacuum annealing increased the degree of crystallinity of the samples when compared to those annealed in vacuum. For the 100 nm samples deposited from the MnAlNiC target, these changes in crystallinity were accompanied by changes in the M-H loops of the samples. MnAlNiC HIP samples had improved magnetic properties compared to those of equal thickness annealed in vacuum. The 100 nm HIP sample sputtered from the MnAl target also showed an increase in moment, though the changes were not as dramatic as those seen in the samples sputtered from the MnAlNiC *** 50 nm films from both targets also showed a change in crystallinity when compared to vacuum annealed samples. These films, unlike the 100 nm films, had ferromagnetic properties that were no better than those of the vacuum annealed samples. This suggests that while the 2 kbar of pressure used in this study assists in the formation of tau-phase in 100 nm films, the appropriate pressure for forming tau-phase in 50 nm films is yet to be determined.

关键词：

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Some Aspects over Thixotropic Fluid Behavior

Some Aspects over Thixotropic Fluid Behavior

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2012 International Conference on Material sciences and Manufacturing Technology(ICMSMT 2012)

作者： Hilbeth P.Azikri de Deus Guilherme S.Paez Dupim Claudio R.Avila da Silva Jr. Nucleus of Applied and Theoretical Mechanics-Nu MAT Post-graduate Program of Mechanical and Materials Engineering-PPGEM Federal University of Technology-Parana (UTFPR)

In this work some theoretical aspects of constitutive equations for thixotropic fluids and restrictions on their functional forms are formally discussed. In the current study a formal emphasis has been given to the structural nature of this substances. The behavior of thixotropic fluids is analyzed in terms of simple isothermal laminar shear flow.

关键词： Thixotropic fluids constitutive equation structural nature

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