Academic literature on the topic 'Système de k-graphes'

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Journal articles on the topic "Système de k-graphes"

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Zhou, Siyu, Mengjian Zhu, Qiang Liu, Yang Xiao, Ziru Cui, and Chucai Guo. "High-Temperature Quantum Hall Effect in Graphite-Gated Graphene Heterostructure Devices with High Carrier Mobility." Nanomaterials 12, no. 21 (2022): 3777. http://dx.doi.org/10.3390/nano12213777.

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Since the discovery of the quantum Hall effect in 1980, it has attracted intense interest in condensed matter physics and has led to a new type of metrological standard by utilizing the resistance quantum. Graphene, a true two-dimensional electron gas material, has demonstrated the half-integer quantum Hall effect and composite-fermion fractional quantum Hall effect due to its unique massless Dirac fermions and ultra-high carrier mobility. Here, we use a monolayer graphene encapsulated with hexagonal boron nitride and few-layer graphite to fabricate micrometer-scale graphene Hall devices. The
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Lei, Shuai, Ningning Su, and Mengwei Li. "Thermal-Resistance Effect of Graphene at High Temperatures in Nanoelectromechanical Temperature Sensors." Micromachines 13, no. 12 (2022): 2078. http://dx.doi.org/10.3390/mi13122078.

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Graphene membranes act as temperature sensors in nanoelectromechanical devices due to their excellent thermal and high-temperature resistance properties. Experimentally, reports on the sensing performance of graphene mainly focus on the temperature interval under 400 K. To explore the sensing performance of graphene temperature sensors at higher temperature intervals, micro-fabricated single-layer graphene on a SiNX substrate is presented as temperature sensors by semiconductor technology and its electrical properties were measured. The results show that the temperature coefficient of the resi
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Duan, Chenqi, Fei Long, Xiaolu Shi, et al. "MWCNTs-GNPs Reinforced TPU Composites with Thermal and Electrical Conductivity: Low-Temperature Controlled DIW Forming." Micromachines 14, no. 4 (2023): 815. http://dx.doi.org/10.3390/mi14040815.

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As an effective technique for fabricating conductive and thermally conductive polymer composites, a multi-filler system incorporates different types and sizes of multiple fillers to form interconnected networks with improved electrical, thermal, and processing properties. In this study, DIW forming of bifunctional composites was achieved by controlling the temperature of the printing platform. The study was based on enhancing the thermal and electrical transport properties of hybrid ternary polymer nanocomposites with multi-walled carbon nanotubes (MWCNTs) and graphene nanoplates (GNPs). With
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Shen, Zongjie, Chun Zhao, Yanfei Qi, et al. "Memristive Non-Volatile Memory Based on Graphene Materials." Micromachines 11, no. 4 (2020): 341. http://dx.doi.org/10.3390/mi11040341.

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Resistive random access memory (RRAM), which is considered as one of the most promising next-generation non-volatile memory (NVM) devices and a representative of memristor technologies, demonstrated great potential in acting as an artificial synapse in the industry of neuromorphic systems and artificial intelligence (AI), due its advantages such as fast operation speed, low power consumption, and high device density. Graphene and related materials (GRMs), especially graphene oxide (GO), acting as active materials for RRAM devices, are considered as a promising alternative to other materials in
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El rai, Marwa Chendeb, Muna Darweesh, and Mina Al-Saad. "Semi-Supervised Segmentation of Echocardiography Videos Using Graph Signal Processing." Electronics 11, no. 21 (2022): 3462. http://dx.doi.org/10.3390/electronics11213462.

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Machine learning and computer vision algorithms can provide a precise and automated interpretation of medical videos. The segmentation of the left ventricle of echocardiography videos plays an essential role in cardiology for carrying out clinical cardiac diagnosis and monitoring the patient’s condition. Most of the developed deep learning algorithms for video segmentation require an enormous amount of labeled data to generate accurate results. Thus, there is a need to develop new semi-supervised segmentation methods due to the scarcity and costly labeled data. In recent research, semi-supervi
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Keating, Blane, Ian McPherson, Dimitrious Valavanis, Aaron-Jerome Agyei, and Patrick Unwin. "Seccm-IRM: A New Tool for Quantitative in Situ Studies of Crystal Growth." ECS Meeting Abstracts MA2022-01, no. 24 (2022): 2498. http://dx.doi.org/10.1149/ma2022-01242498mtgabs.

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Scanning electrochemical cell microscopy (SECCM) is a versatile scanning probe imaging technique that allows for simultaneous elucidation of structure activity relationships at the nanoscale in defined electrolyte volumes and provides high resolution (nm length scale) information on the topography of surfaces and interfaces1. Since its inception in 2010 SECCM has improved understanding of model systems such as graphene, graphite, carbon nanotubes, nanoparticles and conductive diamond and provided electrochemists with a tool for true single entity measurements. Electrodeposition of microscale t
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Li, Tong, Xinli Huang, Shulai Lei, et al. "Two-dimensional nitrogen and phosphorus co-doped mesoporous carbon-graphene nanosheets anode for high-performance potassium-ion capacitor." Energy Materials, 2023. http://dx.doi.org/10.20517/energymater.2022.93.

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Heteroatom-doped carbon materials have high gravimetric potassium-ion storage capability because of their abundant active sites and defects. However, their practical applications toward potassium storage are limited by sluggish reaction kinetics and short cycling life owing to the large ionic radius of K+ and undesirable parasitic reactions. Herein, we report a new strategy that allows for bottom-up patterning of thin N/P co-doped carbon layers with a uniform mesoporous structure on two-dimensional graphene sheets. The highly porous architecture and N/P co-doping properties provide abundant ac
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Dissertations / Theses on the topic "Système de k-graphes"

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Wang, Bin. "Rainbow structures in properly edge-colored graphs and hypergraph systems." Electronic Thesis or Diss., université Paris-Saclay, 2024. http://www.theses.fr/2024UPASG016.

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La combinatoire extrémale est l'une des branches les plus vigoureuses des mathématiques combinatoires au cours des dernières décennies, et elle a été largement utilisée en informatique, en conception de réseaux et en conception de codage. Elle se concentre sur la détermination de la taille maximale ou minimale possible de certaines structures combinatoires, sous certaines conditions ou contraintes. Les ensembles hôtes peuvent être des graphes, des digraphes, des graphes aléatoires, des hypergraphes, des entiers, des nombres premiers, des ensembles, des graphes avec arêtes colorées, etc. Les st
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Khennoufa, Riadh. "Coloration et radio k-étiquetage de graphes." Dijon, 2007. http://www.theses.fr/2007DIJOS067.

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Les travaux de cette thèse se situent dans le cadre de la théorie des graphes et traitent de certains problèmes de coloration et d’autres paramètres qui leur sont associés. Les résultats obtenus trouvent des applications dans des problématiques liées aux réseaux de télécommunications. Principalement, notre contribution porte sur la résolution de problèmes et conjectures de la littérature et sur l’élargissement des connaissances dans le domaine. En premier nous présentons une étude pour différentes valeurs de k du paramètre radio kétiquetage introduit par Chartrand et al. En 2002 , qui consiste
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Trad, Riadh. "Découverte d'évènements par contenu visuel dans les médias sociaux." Thesis, Paris, ENST, 2013. http://www.theses.fr/2013ENST0030/document.

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L’évolution du web, de ce qui était typiquement connu comme un moyen de communication à sens unique en mode conversationnel, a radicalement changé notre manière de traiter l’information. Des sites de médias sociaux tels que Flickr et Facebook, offrent des espaces d’échange et de diffusion de l’information. Une information de plus en plus riche, mais aussi personnelle, et qui s’organise, le plus souvent, autour d’événements de la vie réelle. Ainsi, un événement peut être perçu comme un ensemble de vues personnelles et locales, capturées par différents utilisateurs. Identifier ces différentes in
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Zerbo, Boureima. "Problèmes de plus courts chemins dans les NOC et leurs extensions aux cas difficiles." Lorient, 2012. https://hal.archives-ouvertes.fr/tel-01096420.

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Nous définissons et étudions un problème d'optimisation combinatoire et un programme linéaire en nombres entiers, qui modélise le routage multi-chemin dans un réseau sur puce à garantie de trafic. Basé sur le multiplexage temporel et l'émission cyclique des messages, le modèle permet d'éviter les collisions, les blocages statiques et dynamiques dans des réseaux à topologie irrégulière, tout en minimisant les temps de latence. Une extension de ce problème de routage multi-chemin, qui permet une reconfiguration dynamique du routage au moment de l'exécution est également présentée. Dans ce cas, d
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Trad, Riadh. "Découverte d'évènements par contenu visuel dans les médias sociaux." Electronic Thesis or Diss., Paris, ENST, 2013. http://www.theses.fr/2013ENST0030.

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L’évolution du web, de ce qui était typiquement connu comme un moyen de communication à sens unique en mode conversationnel, a radicalement changé notre manière de traiter l’information. Des sites de médias sociaux tels que Flickr et Facebook, offrent des espaces d’échange et de diffusion de l’information. Une information de plus en plus riche, mais aussi personnelle, et qui s’organise, le plus souvent, autour d’événements de la vie réelle. Ainsi, un événement peut être perçu comme un ensemble de vues personnelles et locales, capturées par différents utilisateurs. Identifier ces différentes in
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Tchuente, Dieudonné. "Modélisation et dérivation de profils utilisateurs à partir de réseaux sociaux : approche à partir de communautés de réseaux k-égocentriques." Toulouse 3, 2013. http://thesesups.ups-tlse.fr/1972/.

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Dans la plupart des systèmes nécessitant la modélisation de l'utilisateur pour adapter l'information à ses besoins spécifiques, l'utilisateur est représenté avec un profil généralement composé de ses centres d'intérêts. Les centres d'intérêts de l'utilisateur sont construits et enrichis au fil du temps à partir de ses interactions avec le système. De par cette nature évolutive des centres d'intérêts de l'utilisateur, le profil de l'utilisateur ne peut en aucun moment être considéré comme entièrement connu par un système. Cette connaissance partielle du profil de l'utilisateur à tout instant t
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Book chapters on the topic "Système de k-graphes"

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Treiman, Rebecca. "Spelling of Phonemes: Correct Spellings, Legal Substitutions, and Illegal Substitutions." In Beginning to Spell. Oxford University Press, 1993. http://dx.doi.org/10.1093/oso/9780195062199.003.0006.

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So far, I have examined children’s spellings at the level of whole words. The results show that children have more difficulty with some kinds of words than others. For example, children often misspell words that contain multiple-letter graphemes, words such as that and sang. Children often misspell irregular words, words such as said and come. One would guess that th is the trouble spot in that and ai is the trouble spot in said. However, because the analyses presented so far are confined to whole words, I cannot say for sure. To determine which parts of words are difficult to spell, I must mo
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Treiman, Rebecca. "Consonants." In Beginning to Spell. Oxford University Press, 1993. http://dx.doi.org/10.1093/oso/9780195062199.003.0008.

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Learning to spell involves learning about the relations between the phonemes of the spoken language and the graphemes of the printed language. In Chapter 4, I asked how children learn these relations for vowels. The results showed that a number of factors affect children’s learning, including their exposure to printed words, their knowledge of letter names, and their phonological systems. In this chapter, I turn to consonants. I ask whether these same factors affect children’s spelling of consonants. This chapter focuses on substitution errors and, to a lesser extent, correct spellings. Conson
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Tyagi, Ankit, Bhuvaneshwari Balasubramaniam, and Raju Kumar Gupta. "Graphene-Based Fiber Shape Supercapacitors for Flexible Energy Storage Applications." In Multidimensional Nanomaterials for Supercapacitors: Next Generation Energy Storage. BENTHAM SCIENCE PUBLISHERS, 2024. http://dx.doi.org/10.2174/9789815223408124010013.

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Energy storage devices are essential because of ever-worsening fossil fuel depletion, increasing energy demand, and increasing environmental pollution. Maxwell Technologies, NessCap, Ashai Glass, and Panasonic commercialize carbon-based conventional supercapacitor devices. Carbon materials like graphene, carbon nanotubes, and activated carbon, are considered favourable materials for bendable and wearable electronic devices. The graphene, because of its high conductivity (thermal ~5 × 103 W m-1 K-1, electrical ~102 to 108 S m-1), extraordinary surface area (theoretically ~2630 m2 g-1), outstand
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Kresin, Vladimir Z., Sergei G. Ovchinnikov, and Stuart A. Wolf. "Materials (III)." In Superconducting State. Oxford University Press, 2021. http://dx.doi.org/10.1093/oso/9780198845331.003.0008.

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This chapter focuses on organic and nanoscale superconducting systems. The tetramethyl-tetraselenafulvalene (TMTSF) and ethylenedithiotetrathiafulvalene (ET) organic families, along with the fullerides, are described. Special attention is paid to graphene-like structures, which are examples of two-dimensional systems. As for nanoscale systems, small-scale nanoscale structures are introduced and the pairing in aromatic molecules, like coronene, is discussed. The presence of the energy shell in some nanoclusters makes the pairing of electrons with opposite projections of orbital momenta perfectl
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Wang, Di, Xin Peng, and Yahui Xue. "Nanofluidic Thermoelectric Materials." In Advanced Thermoelectric Materials - Theory, Development, and Applications [Working Title]. IntechOpen, 2025. https://doi.org/10.5772/intechopen.1009888.

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Thermoelectric transducers have attracted significant attention owing to their immense potential in energy harvesting and biomimetic applications, such as waste heat recovery and the design of advanced thermal sensors. Although traditional thermoelectric semiconductors exhibit excellent thermoelectric performance at room temperature, their toxicity and rarity limit their practical applications. In recent years, with the emergence of advanced materials such as graphene, MXenes, and COFs, inspirations have been provided by biological thermosensitive ion channels to construct nanofluidic thermoel
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Preethish Nandan, Botlagunta. "Innovations in advanced materials science for nano-scale semiconductor manufacturing and integration." In Deep Science Publishing. Deep Science Publishing, 2025. https://doi.org/10.70593/978-93-49910-47-8_4.

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dvanced nanomaterials science, encompassing a knowledge bank of center to nanoscale materials and their in-situ integration with complementary technologies and devices, is aspired to help safeguard the edge of the USA in semiconductor technology over the next ten years. The major challenges in advanced nanomaterials science and its crucial components, including 1-D nanowires and electrodes/contacts, 2-D TMDs, graphene, organic materials and chemicals, bottom-up production and performance improvements across size scales, on-chip integration with mature semiconductor technology-base (including h
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Ahmad, Nafees. "Application of Thin Films in High-Voltage and Power Electronics." In Thin Films - Fundamentals, Deposition Techniques and Applications [Working Title]. IntechOpen, 2025. https://doi.org/10.5772/intechopen.1010012.

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Thin films, ranging in thickness from a few nanometers to several micrometers, play a key role in the development of high-voltage and power electronics technologies. Using precise deposition techniques, these ultra-thin layers provide essential properties such as insulation, thermal management, and improved electrical performance. Using thin films, device miniaturization and performance have been significantly improved, allowing them to be integrated into advanced applications such as capacitors, resistors, and transistors. Their role is particularly evident in wide-bandgap semiconductor devic
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"Hetero-epitaxial double-atomic-layer system of monolayer graphene/monolayer h-BN on N i( ll l) studied by HREELS C Oshima, A Itoh, E Rokuta, N Tanaka and K Yamashita." In Microbeam Analysis. CRC Press, 2000. http://dx.doi.org/10.1201/9781482289428-18.

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Conference papers on the topic "Système de k-graphes"

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Fan, Chun-Yu, Muh-Dey Wei, and Renato Negra. "K-band Mixerless Transmitter Using a Graphene MMIC Process on Flexible Substrate." In 2024 31st IEEE International Conference on Electronics, Circuits and Systems (ICECS). IEEE, 2024. https://doi.org/10.1109/icecs61496.2024.10848789.

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Saeidijavash, Mortaza, Jivtesh Garg, and Bin Wang. "Effect of Alignment on Thermal Conductivity Enhancement of Polyethylene/Graphene Nanoplatelet Composite Materials." In ASME 2016 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/imece2016-66987.

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In this work we investigate the effect of molecular alignment on thermal conductivity (k) enhancement of polyethylene/graphene nanoplatelet (PE/GNP) composites. Enhancement of thermal conductivity of polymers can pave way for their application in heat exchangers leading to significant energy savings as processing of polymers is more energy efficient than metals. Such energy savings will drive down costs and will have the additional benefit of considerably reducing the environmental effects of energy production. Such high k polymers will also enable improved thermal management in electronic dev
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Moulod, Mohammad, and Gisuk Hwang. "Comparative Studies on Water Self-Diffusivity Confined in Graphene Nanogap: Molecular Dynamics Simulation." In ASME 2016 14th International Conference on Nanochannels, Microchannels, and Minichannels collocated with the ASME 2016 Heat Transfer Summer Conference and the ASME 2016 Fluids Engineering Division Summer Meeting. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/icnmm2016-7962.

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Fundamental understanding of the water in graphene is crucial to optimally design and operate the sustainable energy, water desalination, and bio-medical systems. A numerous atomic-scale studies have been reported, primarily articulating the surface interactions (interatomic potentials) between the water and graphene. However, a systematic comparative study among the various interatomic potentials is rare, especially for the water transport confined in the graphene nanostructure. In this study, the effects of different interatomic potentials and gap sizes on water self-diffusivity are investig
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Armandi, Marco, Barbara Bonelli, and Edoardo Garrone. "Synthesis and Characterization of Mesoporous and Microporous Carbons With Potential Applications as Hydrogen Storage Media." In ASME 8th Biennial Conference on Engineering Systems Design and Analysis. ASMEDC, 2006. http://dx.doi.org/10.1115/esda2006-95740.

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The preparation and physico-chemical characterization of mesoporous and microporous carbons, obtained via a casting procedure, from a SBA-15 silica and a commercial Na-Y zeolite, is reported. XRD spectra showed that ordered carbon replicas occur in all cases. Micro-Raman spectra showed that rather homogeneous powders are obtained, exhibiting the presence of a graphitized carbon phase of small imperfect graphene sheets, typical of sp2 C, along with an amorphous one, notwithstanding the relatively low temperature adopted during the carbonization processes (1173 K). N2 adsorption isotherms at 77
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Roy, Samit, and Avinash Akepati. "Multi-Scale Modeling of Fracture Properties for Nano-Particle Reinforced Polymers Using Atomistic J-Integral." In ASME 2014 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/imece2014-36419.

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The nano-scale interaction between polymer molecules and nanoparticle is a key factor in determining the macro-scale strength of the composite. In recent years numerous efforts have been directed towards modeling nanocomposites in order to better understand the reasons behind the enhancement of mechanical properties, even by the slight addition (a few weight percent) of nano-materials. In order to better understand the local influence of nano-particle on the mechanical properties of the composite, it is required to perform nano-scale analysis. In this context, modeling of fracture and damage i
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Norris, Pamela M., Justin L. Smoyer, John C. Duda, and Patrick E. Hopkins. "Prediction and Measurement of Thermal Transport Across Interfaces Between Isotropic Solids and Graphitic Materials." In ASME 2010 8th International Conference on Nanochannels, Microchannels, and Minichannels collocated with 3rd Joint US-European Fluids Engineering Summer Meeting. ASMEDC, 2010. http://dx.doi.org/10.1115/fedsm-icnmm2010-30171.

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Due to the high intrinsic thermal conductivity of carbon allotropes, there have been many attempts to incorporate such structures into existing thermal abatement technologies. In particular, carbon nanotubes (CNTs) and graphitic materials (i.e., graphite and graphene flakes or stacks) have garnered much interest due to the combination of both their thermal and mechanical properties. However, the introduction of these carbon-based nanostructures into thermal abatement technologies greatly increases the number of interfaces per unit length within the resulting composite systems. Consequently, th
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Mobinipouya, Neda, and Omid Mobinipouya. "On the Heat Transfer Enhancement of Turbulent Gas Floes in Short Round Tubes Engaging a Light Gas Mixed With Selected Heavier Gases." In ASME 2011 9th International Conference on Nanochannels, Microchannels, and Minichannels. ASMEDC, 2011. http://dx.doi.org/10.1115/icnmm2011-58136.

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A unique way for maximizing turbulent free convection from heated vertical plates to cold gases is studied in this paper. The central idea is to examine the attributes that binary gas mixtures having helium as the principal gas and xenon, nitrogen, oxygen, carbon dioxide, methane, tetrafluoromethane and sulfur hexafluoride as secondary gases may bring forward. From fluid physics, it is known that the thermo-physical properties affecting free convection with binary gas mixtures are viscosity ηmix, thermal conductivity λmix, density ρmix, and heat capacity at constant pressure. The quartet ηmix,
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HUANG, SHIH-CHAO, YUN-AN LIN, TAYLOR PIERCE, ELIJAH WYCKOFF, and KENNETH J. LOH. "MEASURING THE GOLF SWING PATTERN USING MOTION TAPE FOR FEEDBACK AND FAULT DETECTION." In Structural Health Monitoring 2023. Destech Publications, Inc., 2023. http://dx.doi.org/10.12783/shm2023/36964.

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Golfers must hone the sequence of the golf swing for consistent and efficient results, where a good golf shot is both precise and accurate. It takes countless hours of practice to develop the skill, and methods such as video feedback and coaching serve as aids to the process. However, few methods outside of visual observations exist to identify factors in the swing that cause a poor shot. Most golf analysis equipment is expensive and requires extensive setup time. Some systems only measure the physics of the ball and are limited to the practice range, whereas wearable sensors for golf are limi
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