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arXiv 2025年

作者： Khalfin, Sasha Veber, Noam Shaek, Saar Shamaev, Betty Levy, Shai Dror, Shaked Kauffmann, Yaron Khristosov, Maria Koifman Bekenstein, Yehonadav Department of Materials Science and Engineering Technion Israel Institute of Technology Haifa3200003 Israel The Solid-state institute Technion – Israel Institute of Technology Haifa3200003 Israel The Nancy and Stephen Grand Technion Energy Program Technion Israel Institute of Technology Haifa32000 Israel

breaking crystal symmetry is essential for engineering emissive double perovskite metal halides. The goal is to overcome their inherently indirect and disallowed optical transitions. Here we introduce a synthesis for silver - Cs2AgInCl6 two-dimensional hybrid nanoplate products that break the symmetry in two ways, their shape and their heterointerfaces. A comparative study between Cs2AgInCl6 nanocubes and nanoplates is presented to emphasize the difference in optical properties. A modified colloidal synthesis for Cs2AgInCl6 yields high-quality nanoplates with small lateral dimensions very different from the symmetric cubes. Each nanoplate is decorated with metallic silver nanoparticles, with diameters on the scale of the thickness of the perovskite nanoplate, forming significant heterointerfaces that further break symmetry. The Cs2AgInCl6 two-dimensional nanoplates also demonstrate facile transformation into larger crystalline nanosheets once deposited on substrates. We thus highlight those nanoplates as potential building blocks for assemblies of functional surfaces. © 2025, CC BY-NC-ND.

关键词： Perovskite

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Current Carrying Capacity of Inkjet-Printed Nano-Silver Interconnects on Mesoporous PET Substrate

Current Carrying Capacity of Inkjet-Printed Nano-Silver Inte...

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Electronic Components and Technology Conference (ECTC)

作者： El Mehdi Abbara Gurvinder Singh Khinda Mohammed Alhendi Riadh Alhaidari Firas Alshatnawi Behnam Garakani Udara S. Somarathna Mark D. Poliks Department of Systems Science and Industrial Engineering State University of New York Binghamton USA Center for Advanced Microelectronics Manufacturing State University of New York Binghamton USA Materials Science and Engineering Program State University of New York Binghamton USA

Conductors are a basic component in any flexible hybrid electronic device. Their electromechanical reliability has been studied, yet very few studies report their thermoelectric behavior. We report the current carrying capacity of an inkjet-printed nano-silver interconnects on mesoporous PET substrate. For this study, the printed interconnects are approximately 100 μm wide, with two different thicknesses: single layer (~650 nm thick) and double layer (~1 μm thick). Samples were sintered with different parameters of oven and laser sintering. The effect of printing and curing parameters on the trace current-carrying capability is evaluated with and without the presence of an encapsulation layer. At the current sweep range of 0.005-0.08A for single layer traces and 0.005-0.17A for double layer traces, results show that the trace resistance slightly increases and then decreases to a minimal value smaller than the initial resistance before dramatically increases indicating substrate damage. The double-layer traces withstand higher current and reach higher temperature than the substrate glass transition point. The oven sintered traces have higher initial resistance than laser sintered samples reflecting the difference in the percentage of solvent content and the microstructure. A drastic decrease in resistance is noticed at low current for the oven sintered samples, but at higher current, both oven and laser sintered traces showed similar behavior. The printed encapsulation layer did not significantly impact the trace behavior. A thermoelectric simulation of the trace joule heating was generated in order to quantify the thermal energy transmitted to the surrounding environment and capture the temperature of the trace surface. The model was compared to the experimental results and showed a good correlation.

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Exploring Low Rate Dos Attack Detection Methods: A Bibliometric Analysis and Roadmap for Further Research

Exploring Low Rate Dos Attack Detection Methods: A Bibliomet...

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International Conference on Data and Software engineering (ICODSE)

作者： Anteng Widodo Adian Fatchur Rochim Budi Warsito Doctoral Program of Information System School of Postgraduated Studies Diponegoro University Semarang Indonesia Department of Information System Faculty of Engineering Muria Kudus University Kudus Indonesia Department of Computer Engineering Faculty of Engineering Diponegoro University Semarang Indonesia Department of Statistics Faculty of Science and Mathematics Diponegoro University Semarang Indonesia

Low-Rate Denial of Service (LDoS) attacks, an emerging breed of DoS attacks, present a formidable challenge in terms of their detectability. Within the realm of network security, these attacks cast a substantial shadow over the availability and integrity of services. This study seeks to delve into the intricate mechanics of LDoS attacks and explore the landscape of developed detection methodologies. Employing bibliometric analysis, we employ a multifaceted approach to gather research insights pertaining to LDoS attack detection. This approach encompasses the examination of evolving research trends, scrutiny of widely cited scientific publications within the same domain, identification of prolific researchers shaping the field, and a judicious selection of reputable publishers for dependable information acquisition. Furthermore, our study undertakes a meticulous categorization and classification of previously proposed LDoS detection methods documented in well-established scientific literature. This endeavor not only provides a more profound comprehension of the evolutionary trajectory and thematic thrusts within LDoS attack detection research, but it also facilitates the identification of gaps and directions for future exploration. The culmination of these analytical efforts culminates in a comprehensive framework. This contribution manifests through structured categorization, classification, and a forward-looking research roadmap, which collectively serve as valuable tools for both current and aspiring researchers engaged in LDoS attack detection. In summary, this research not only delves into the complexities of LDoS attacks and their mechanisms but also augments the current understanding of detection capabilities. Through its nuanced contributions, this paper extends a helpful guide to the dynamic realm of LDoS attack detection, thus catalyzing advancements and insights for the future.

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Mechanical performance of needle-punched carbon fiber reinforced phenolic composites

Mechanical performance of needle-punched carbon fiber reinfo...

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SAMPE 2021 Conference and Exhibition

作者： Trevino, Esmerehildo Belduque, Camila Tate, Jitendra Ingram School of Engineering Texas State University 601 University Drive San MarcosTX78666 United States Materials Science Engineering and Commercialization Program Texas State University 601 University Drive San MarcosTX78666 United States

ISBN: (纸本)9781934551394

Traditional composite laminates that are highly used in the aerospace and automotive industry have reinforcing fibers that lie in the X and Y orientation of the laminate or ply stack. The resulting composite product is one with anisotropic properties, being weaker in the Z orientation of the laminate. Composite failure will occur between the reinforcing layers at the resin rich interlayer. To improve the composite's resistance to delamination, a needle-punching process is utilized to re-orient parent carbon fibers thru the thickness of the dry fiber ply stack. The needlepunching equipment consists of a needle-board carrying rows of barbed needles. The needleboard drives the needles through the preform, and the barbs re-orienting the fibers in the Z direction. Rayon based 8-harness satin carbon fiber is needle-punched and infused with a phenolic resin using Vacuum Assisted Resin Transfer Molding (VARTM). Varying degrees of needle-punch density are evaluated for their respective inter-laminar shear strengths. A correlation model of needle-density to mechanical behavior was developed and fiber reorientation was analyzed by microscopic imaging. © 2021 Soc. for the Advancement of Material and Process engineering. All rights reserved.

关键词： Needles

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Terahertz emission characteristics of semi-insulating and low-temperature grown gallium arsenide photoconductive antenna at 780 nm and 1.55μm

Terahertz emission characteristics of semi-insulating and lo...

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International Conference on Infrared and Millimeter Waves

作者： Alexander De Los Reyes Jairrus Publico Ivan Cedrick Verona John Paul Ferrolino Vince Paul Juguilon Lourdes Nicola Dela Rosa Hannah Bardolaza Neil Irvin Cabello Elmer Estacio National Institute of Physics University of the Philippines Diliman Quezon City Philippines Materials Science and Engineering Program University of the Philippines Diliman Quezon City Philippines

ISBN: (数字)9781728194271

ISBN: (纸本)9781728194288

The terahertz (THz) emission from semi-insulating (SI-GaAs) and low-temperature grown gallium arsenide (LTGaAs) photoconductive antenna were measured at above bandgap 780 nm and below bandgap 1.55 $\mu \mathrm{m}$ photoexcitation conditions. The SI-GaAs and LT-GaAs samples have also shown different amplitude and bandwidth characteristics between the two wavelengths. We explain our results in the context of the different THz radiation mechanisms between SI-GaAs and LT-GaAs at below-bandgap excitation. This work provides insights on the possible development of GaAs PCAs for telecommunication wavelength application.

关键词： Antenna measurements Photonic band gap Wavelength measurement Gallium arsenide Bandwidth Communications technology Antennas

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Porous Mesh Manifold for Enhanced Pool Boiling Performance

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SSRN 2024年

作者： Giglio, Roman Shattique, Muhammad Rubaiet Dede, Ercan M. Narumanchi, Sreekant Asheghi, Mehdi Goodson, Kenneth E. Palko, James W. Department of Mechanical Engineering University of California MercedCA United States Materials and Biomaterials Science and Engineering Graduate Program University of California MercedCA United States Toyota Research Institute of North America Ann ArborMI United States National Renewable Energy Laboratory GoldenCO United States Department of Mechanical Engineering Stanford University StanfordCA United States

High performance electronics are continuously demanding cooling of higher heat fluxes. Phase change cooling, including pool boiling, is a useful approach to address this challenge, however competition between liquid and vapor flows generally limit the heat fluxes that can be dissipated. Here a manifold structure formed from metallic mesh is introduced to control the disposition of liquid and vapor phases above a boiling surface enhanced with a porous structure. Copper mesh forms defined liquid flow paths using capillary action to guide and distribute liquid evenly over the heated surface and open channels to facilitate vapor escape. The manifold performance is characterized in pool boiling with water above a laser textured aluminum nitride heat dissipation surface with pin fin structures having heights of 110 µm and spacing of 30 µm with a heated area of 5 mm x 5 mm. Maximum heat flux of 490W/cm is reached with the manifold in the pool boiling configuration, representing a 64% increase over the porous surface alone. Maximum superheat found for the manifold is 36 K, which is 14 K higher than the porous surface without manifold. Factors limiting performance of the manifold are analyzed. Based on variation of manifold geometry and numerical simulation, the primary limitation to heat flux is found to be viscous resistance to liquid flow in the manifold mesh. The increased superheat is attributed to partial flooding of the boiling surface as indicated by reduction in superheat using external suction. Similar systems and structures for enhanced two-phase cooling are compared. © 2024, The Authors. All rights reserved.

关键词： Heat flux

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Mid-IR Gain of Tensile Germanium Waveguide Lasers with SiNx Stress Liners

Mid-IR Gain of Tensile Germanium Waveguide Lasers with SiNx ...

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2021 IEEE Photonics Society Summer Topicals Meeting Series, SUM 2021

作者： Reza, Md Shamim Gulyas, Istvan Wistey, Mark A. Materials Science Engineering and Commercialization Program Texas State University San MarcosTX78666 United States Department of Physics Texas State University San MarcosTX78666 United States

ISBN: (纸本)9781665416009

We used ab-initio and finite element strain modeling to explain high threshold current densities in reported tensile Ge lasers. Anisotropic strains improve carrier confinement but reduces optical confinement, and intervalence band absorption still dominates. Strain anisotropy increases Jth compared with simple slab models. © 2021 IEEE.

关键词： Germanium

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Thermal, Morphological and Structural Characterization Of Cyperus Malaccensis And Graphene Oxide Acting As a Coupling Agent for Future Reinforcement Applications

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SSRN 2023年

作者： de Mendonça Neuba, Lucas Junio, Raí Felipe Pereira Souza, Andressa Teixeira Chaves, Yago Soares Palmeira, Alexandre Alvarenga Tavares, Sheron Lazarus, Benjamin Pereira, Artur Camposo Monteiro, Sergio Neves Military Institute of Engineering - IME Department of Materials Science Praça General Tibúrcio 80 Praia Vermelha Urca RJ Rio de Janeiro22290-270 Brazil Department of Mechanical Engineering University of Rio de Janeiro State Rod. Pres. Dutra Km 298 Polo Industrial Rj Resende27537-000 Brazil Materials Science and Engineering Program University of California 9500 Gilman Drive La Jolla San DiegoCA United States Military Institute of Engineering Brazil

Natural lignocellulosic fibers (NLFs) are currently receiving exponential concern from researchers on employing them as an engineering material. Particularly, they are being applied as a reinforcement for conventional and biodegradable polymer matrices. Due to the fact that NLFs are a renewable resource, environmentally friendly and require less energy for processing. However, they present drawbacks related to their compatibility with the polymer matrix, caused by the difference in the hydrophilic nature of NLFs and the hydrophobic for polymers. Graphene oxide (GO) is becoming extremely interesting when applied as a coupling agent between the fiber-matrix interface. On account of the amphiphilic nature of the nanomaterial. Therefore, the present work focus on the investigation of the seven- islands sedge (Cyperus malaccensis) coated with GO in 0.1% of the weight of the fiber. Thus, make a comparison with the untreated sedge fibers in terms of their thermal behavior, morphological aspect and structural characterization. Based on the TGA/DTG curves, it was possible to verify that the coating has attained better thermal stability properties. While the DSC thermal curves revealed endothermic and exothermic peaks related to the fiber microstructures. The FTIR spectrum validated the presence of bans associated with the GO structure. XRD affirmed an increase in the crystallite size which improves the interface adhesion. At last, SEM images unveiled the effective GO coating on the surface of the natural fiber. © 2023, The Authors. All rights reserved.

关键词： Fibers

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Reduced graphene oxide membrane as supporting film for high-resolution cryo-EM

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Biophysics Reports 2021年第3期7卷 227-238页

作者： Nan Liu Liming Zheng Jie Xu Jia Wang Cuixia Hu Jun Lan Xing Zhang Jincan Zhang Kui Xu Hang Cheng Zi Yang Xin Gao Xinquan Wang Hailin Peng Yanan Chen Hong-Wei Wang Ministry of Education Key Laboratory of Protein Sciences Beijing Advanced Innovation Center for Structural BiologySchool of Life SciencesTsinghua University Tsinghua-Peking Joint Center for Life Sciences Tsinghua University Center for Nanochemistry Beijing Science and Engineering Center for NanocarbonsBeijing National Laboratory for Molecular SciencesCollege of Chemistry and Molecular EngineeringPeking University Joint Graduate Program of Peking-Tsinghua-NIBS School of Life SciencesTsinghua University Beijing Frontier Research Center for Biological Structures Tsinghua University Academy for Advanced Interdisciplinary Studies Peking University School of Materials Science and Engineering Tianjin University

Although single-particle cryogenic electron microscopy(cryo-EM) has been applied extensively for elucidating many crucial biological mechanisms at the molecular level, this technique still faces critical challenges, the major one of which is to prepare the high-quality cryo-EM specimen. Aiming to achieve a more reproducible and efficient cryo-EM specimen preparation, novel supporting films including graphene-based two-dimensional materials have been explored in recent years. Here we report a robust and simple method to fabricate EM grids coated with single-or few-layer reduced graphene oxide(RGO) membrane in large batch for high-resolution cryo-EM structural determination. The RGO membrane has decreased interlayer space and enhanced electrical conductivity in comparison to regular graphene oxide(GO) membrane. Moreover, we found that the RGO supporting film exhibited nice particle-absorption ability, thus avoiding the air–water interface problem. More importantly, we found that the RGO supporting film is particularly useful in cryo-EM reconstruction of sub-100-k Da biomolecules at near-atomic resolution, as exemplified by the study of RBD-ACE2 complex and other small protein molecules. We envision that the RGO membranes can be used as a robust graphene-based supporting film in cryo-EM specimen preparation.

关键词： 3D reconstruction Reduced graphene oxide Cryo-EM Air–water interface

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A Multicolor Fluorescent Sensor Array Based on Curcumin and its Analogs as a Shrimp Freshness Indicator

SSRN

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SSRN 2022年

作者： Tian, Yanqing Cai, Shaoyong Song, Guangjie Zhang, Guofan Wang, Lei Jian, Tianlan Xu, Jiatong Su, Fengyu Department of Materials Science and Engineering Southern University of Science and Technology Shenzhen518055 China Academy of Advanced Interdisciplinary Studies Southern University of Science and Technology No 1088 Xueyuan Blvd Xili Nanshan District Guangdong Shenzhen518055 China Department of Electrical and Electronic Engineering Southern University of Science and Technology Shenzhen518055 China

The colorimetric sensing label is a simple, cost-effective, and user-friendly tool for monitoring ammonia vapor (NH3) concentrations in food packaging. Numerous natural dyes present excellent NH3-sensitivity, but their low solubility in water limits food-related applications. Herein, a special cellulose-based ink system with EtOH/water mixture as a solvent was proposed to improve the dispersion of non-aqueous dyes (curcumin and its analogs (Bur and Bur-BF2)). The rheological properties of the inks during screen printing were optimized for preparing the sensing labels with high-definition anti-counterfeiting patterns. Each sensing label showed a unique fluorescent color-changing route which was associated with the dye structure for detecting NH3 in the concentration range of 0 to 50 ppm. The response time, selectivity, and environmental stability of sensing labels were then characterized. Among them, the sensing label with Bur-BF2 had the highest NH3-sensitivity with a detection limit of 84.85 ppb. Finally, a multicolor fluorescent sensor array (consisting of three sensing labels) has potential for use in providing visual indicators for consumers in shrimp freshness determination. © 2022, The Authors. All rights reserved.

关键词： Ammonia

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