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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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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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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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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.

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Extruded LZS glass-ceramics

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American Ceramic Society Bulletin 2004年第8期83卷

作者： Montedo, O.R.K. Reitz, G.M. Bertan, F.M. De Novaes Oliveira, A.P. Hotza, D. Siligardi, C. Graduate Program in Materials Science and Engineering Federal University of Santa Catarina Florianópolis Brazil Dept. of Materials and Environment Engineering University of Modena and Reggio Emilia Modena Italy

Experimental results regarding Li2O-ZrO2-SiO 2 (LZS) sintered glass ceramic materials obtained by extrusion of glass powders with an added inorganic material as binder, are presented. Each of the composition were characterized by chemical analysis, laser scattering particle-size analysis, differential thermal analysis (DTA), Xray diffractometry (XRD), and thermal expansion. It was observed that after a sintering process at near by 750°C, crystallization takes place as soon as the process gets over. Once heated, the the glass powder compacts crystallize into zircon and quartz and then to lithium disilicate.

关键词： Glass ceramics

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Injectable Platelet-Rich Fibrin in Contact with Bone Substitutes, Porous Zirconia, or Laser-Textured Implant Surfaces: A Detailed Morphological Analysis

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Biomedical materials and Devices 2024年第1期2卷 415-426页

作者： Oliveira, Miguel Noronha Varela, Hugo Almeida Nascimento, Rubens M. Sahoo, Narayan Carvalho, Oscar Henriques, Bruno Souza, Júlio C. M. Ceramic and Composite Materials Research Group (CERMAT) Department of Mechanical Engineering (EMC) Federal University of Santa Catarina (UFSC) Post-graduate Program in Materials Science and Engineering Federal University of Rio Grande Norte (UFRN) Center for MicroElectroMechanical Systems (CMEMS-UMINHO) Universidade do Minho LABBELS - Associate Laboratory University of Minho University Institute of Health Sciences (IUCS) CESPU

The aim of the present study was to perform a detailed morphological analysis of an injectable platelet rich fibrin after combination with two different particulate hydroxyapatite-based granules, a porous zirconia block, and laser-textured zirconia or titanium surfaces. Blood samples were harvested from three participants to prepare the flowable injectable PRF in contact or not with particulate hydroxyapatite (Hap), bone mineral granules (DBBM), porous zirconia blocks, laser-textured titanium or zirconia surfaces. Optical and scanning electron microscopy (SEM) were used to evaluate the fibrin network density, fibrin fibers’ diameter, blood cells, and the interaction of PRF with the biomaterials. Histomorphometry of the flowable PRF was also performed using the hematoxylin–eosin staining protocol. Specimens were independently evaluated by two blinded and well-trained researchers in histomorphometry and microscopy. Particulate Hap and DBBM shown different morphological aspects by SEM analyses since DBBM revealed macro- and micro-scale pores while Hap revealed a dense structure. Hydroxyapatite and DBBM granules were entirely embedded by the fibrin-network in the presence of leukocytes and blood platelets. The zirconia porous structured was filled with PRF and its components. Also, the laser-structured zirconia or implant surfaces were entirely coated with the PRF fibrin network embedding leukocytes and blood platelets. Laser-textured titanium surfaces revealed macro- and micro-scale irregularities that increase the surface area and retention of the injectable PRF. Histomorphometric analyses revealed complementary details on the distribution of lymphocytes, red blood cells, and fibrin associated with platelet aggregation. The flowing and viscosity of an injectable platelet rich fibrin provided an agglomeration of synthetic or xenogeneic particulate bone substitutes and the coating of porous zirconia and textured implant surfaces as inspected by scanning electron microsc

关键词： Bone healing Bone substitutes Histology Morphology Platelet-rich fibrin

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Selectively bonded polymeric check valve for the reliable regulation of intraocular pressure

Selectively bonded polymeric check valve for the reliable re...

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作者： Im, Seongmin Mun, Byungphil An, Jaeyong Choi, Jongchan Yang, Sung Lee, Jonghyun School of Mechatronics Gwangju Institute of Science and Technology Gwangju Korea Republic of Graduate Program of Medical System Engineering Gwangju Institute of Science and Technology Gwangju Korea Republic of Department of Nanobio Materials and Electronics Gwangju Institute of Science and Technology Gwangju Korea Republic of

ISBN: (纸本)9789898425379

A glaucoma drainage device for the regulation of intraocular pressure is presented. The device consists of three biocompatible polymer layers: the cover (top layer), the diaphragm (intermediate layer), and the baseplate with a cannular (bottom layer). Finite element analyses (FEA) were performed to find optimal design parameters for the targeted cracking pressure: the diameter of orifice, the thickness of intermediate layer, the width of the channel, and the overlapped length of the orifice over valve seat. Top and bottom layers were made by polydimethylsiloxane (PDMS) replica molding process, and an intermediate thin layer with through-holes was fabricated by PDMS fill-in molding method and hydrophobic treatment. The overlapped area of the bottom layer was coated with Cr and Au by using PDMS as a shadow mask. Metal layers are not to be bonded between the bottom and the intermediate layers so that the device showed the enhanced reliability in operation and the higher yield in production. Oxygen plasma treatment was performed for irreversible bonds between separate three PDMS layers. The experimental cracking pressure of the fabricated valve was 2.50 kPa, which is very close to the target value (2.67 kPa). The experiments showed that the proposed polymer check valve can regulate the pressure of the aqueous humour, fluid in an anterior chamber, within the normal intraocular pressure range (15-20mmHg) with a high repeatability.

关键词： Polydimethylsiloxane

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engineering dimensionality of collective dipole-dipole interactions using a nanophotonic environment

Engineering dimensionality of collective dipole-dipole inter...

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2023 Conference on Lasers and Electro-Optics, CLEO 2023

作者： Boddeti, Ashwin K. Wang, Yi Juarez, Xitlali Boltasseva, Alexandra Alaeian, Hadiseh Odom, Teri W. Jacob, Zubin Elmore Family School of Electrical and Computer Engineering Birck Nanotechnology Center Purdue University West LafayetteIN47907 United States Graduate Program in Applied Physics Northwestern University EvanstonIL60208 United States Department of Materials Science and Engineering Northwestern University EvanstonIL60208 United States Department of Chemistry Department of Materials Science and Engineering Northwestern University EvanstonIL60208 United States

ISBN: (纸本)9781957171258

We experimentally demonstrate reduced dimensionality in a interacting ensemble of emitters. The well-known stretched exponential decay dynamics, (Equation presented) with β = 0.5 in 3D geometries, is strikingly modified in a nanophotonic environment that supports long-range interaction to β ~ 0.3. © Optica Publishing Group 2023.

关键词： Nanophotonics

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