Relevant bibliographies by topics / PTC ceramics

Contents

  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers
  6. Reports

Academic literature on the topic 'PTC ceramics'

Author: Grafiati
Published: 28 June 2021
Last updated: 11 February 2022

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Journal articles on the topic "PTC ceramics"

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Mittal, Prakhar, Shiva Naresh, Priyanka Luthra, Amardeep Singh, Jatinder Singh Dhaliwal, and Gurpreet Singh Kapur. "Polypropylene composites reinforced with hybrid inorganic fillers: Morphological, mechanical, and rheological properties." Journal of Thermoplastic Composite Materials 32, no. 6 (July 16, 2018): 848–64. http://dx.doi.org/10.1177/0892705718785674.

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Mineral fillers like talc and mica are commonly used in the plastic industry because of their tendency to alter the properties of thermoplastic materials. Polypropylene (PP)-talc (PTC), PP-mica (PMC), and PP-talc/mica hybrid composites (PHC) were prepared. Results indicated that filler particle size, type, and content greatly influence the mechanical and rheological properties of the composites. Shear viscosity decreased with the increase in shear rate. At 40°C, an increase of approximately 120% in storage modulus ( E′) was observed in PMC composites. C parameter increased, whereas reinforcing efficiency ( r) decreased with the increase in filler loading. Percent elongation of each type of composites decreased with the increase in filler loading. Tensile modulus of PTC composite increased significantly by 103% (571 MPa) at 20% loading of talc, whereas for PHC and PMC composites, increase of 93% (543 MPa) and 81% (511 MPa) was observed. Flexural modulus also increased considerably by 88% (2413 MPa), 80% (2313 MPa), and 62% (2084 MPa) of PTC, PHC, and PMC composites at 20% filler loading.
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Yang, Ai Mei, Jian Ming Deng, Cong Xue Su, Wen Hao Jia, and Lai Jun Liu. "Effect of Defect Characteristics on the Color of BaTiO3-Based PTC Ceramic." Key Engineering Materials 697 (July 2016): 243–47. http://dx.doi.org/10.4028/www.scientific.net/kem.697.243.

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The barium titanium based PTC ceramic with two kind of colors, light blue and yellow, were obtained by changing sintering processing. In order to reveal the relationship between color and electrical properties of the ceramics. The phase structure and microstructure of as synthesized samples were investigated by powder X-ray diffraction (XRD) and scanning electron microscopic (SEM) analysis. The micro area elements were characterized by electron probe micro-analyzer (EPMA) and x-ray photoelectron spectrometer (XPS). The thermo-sensitive properties were studied by resistance-temperature measurement system. The results reveal that two kinds of PTC ceramics have the same structure, similar elements, but different microstructure and valence concentration of titanium. It is suggested that difference of color of the PTC ceramics are originated from the defect concentration of titanium.
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Chen, Bin Bin, Shu Ping Gong, Jian Qiao Liu, Lian Hua Li, and Dong Xiang Zhou. "Effects of BN Dopant on Electrical Characteristics of Barium-Excessive BaTiO3 Ceramics for Laminated Positive Temperature Coefficient Thermistors Fabricated by Tape Casting Technique." Advanced Materials Research 415-417 (December 2011): 994–99. http://dx.doi.org/10.4028/www.scientific.net/amr.415-417.994.

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The barium-excessive BaTiO3 ceramics with BN addition for laminated positive temperature coefficient (PTC)thermistors are fabricated. The tape casting technique and reduction/reoxidation process are employed into the fabricating procedure. The influences of BN additive on ceramic characteristics are discussed. The addition over 5% leads to rectangular and abnormal large grains. The 5% BN-doped ceramics shows a resistivity of 233 Ω•cm and PTC jump of 3.4 orders of magnitude. The charge carrier density in grain bulk and acceptor state density at grain boundaries are evaluated. The correlation of BN doping amount with room temperature resistivity, PTC jump, reoxidation effect as well as charge carrier and acceptor state density are investigated.
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Liu, Huan, Shu Ping Gong, Dong Xiang Zhou, Chun Fang Cheng, Zhi Ping Zheng, and Yun Xiang Hu. "Microstructure and Electrical Properties of BaTiO3-Based PTC Ceramics Prepared from Nanopowders." Key Engineering Materials 368-372 (February 2008): 456–58. http://dx.doi.org/10.4028/www.scientific.net/kem.368-372.456.

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Dense PTC ceramics were prepared with BaTiO3 nanopowders synthesized by hydrothermal method. BaCO3 and Ti(OC4H9)4 were used as barium and titanium sources, and Y(NO)3·6H2O as the donor dopant respectively. The average grain size of the powders obtained after hydrothermal treatment at 160°C for 9h was about 30nm with cubic structure. Mn(NO3)2 was introduced to the as-prepared nanopowders in order to improve the PTC effect. After sintered at 1280°C, the PTC ceramic samples exhibited sufficient resistance jump ratio(1.086×103) around Curie temperature, the density of which was 5.81g/cm3(96.5% of the theoretical density).
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Wang, D. J., J. Qiu, Y. C. Guo, Z. L. Gui, and L. T. Li. "Grain boundary effects in NTC-PTC composite thermistor materials." Journal of Materials Research 14, no. 1 (January 1999): 120–23. http://dx.doi.org/10.1557/jmr.1999.0019.

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Yttrium-doped (Sr0.45Pb0.55)TiO3 ceramics have been studied by complex impedance analysis. As a sort of NTC-PTC composite thermistor, it exhibited a significantly large negative temperature coefficient of resistivity below Tc in addition to the ordinary PTC characteristics above Tc. It is found that the NTC effect in NTC-PTC materials was not originated from the deep energy level of donor (bulk behavior), but from the electrical behavior of the grain boundary. Therefore, the NTC-PTC composite effect was assumed to be a grain boundary effect, and yttrium was a donor at shallow energy level. The NTC-PTC ceramics were grain boundary controlled materials.
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Wu, Hongya, Caihui Wang, Hua Fu, Ji Zhou, and Shuzhi Zheng. "Unipolar memristive switching in bulk positive temperature coefficient ceramic thermistor." Modern Physics Letters B 30, no. 04 (February 10, 2016): 1650025. http://dx.doi.org/10.1142/s0217984916500251.

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A memristive switching phenomena was investigated in macroscale bulk positive temperature coefficient (PTC) thermosensitive ceramics. (Ba[Formula: see text]Sr[Formula: see text])TiO3, which is a well-known PTC thermistor, was taken as an example to analyze the memristive behavior of those macroscale bulk ceramics. Hysteretic current–voltage (I–V) characteristics, which are the features of memristor were obtained. The origin of the effect is attributed to the PTC thermosensitive characteristic of the bulk ceramics, and a switching mechanism driven by competing field-driven heat generation and heat dissipation was proposed.
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Takagi, Hiroshi. "History and Future Prospect of Electro-ceramics in Japan and Asia." Additional Conferences (Device Packaging, HiTEC, HiTEN, and CICMT) 2012, CICMT (September 1, 2012): 000002–9. http://dx.doi.org/10.4071/cicmt-2012-kn2_murata.

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On the background of a long history of Japanese ceramics, various electro-ceramic materials have been studied and many kinds of electronic components using them have been developed in Japan. The first invention of electro-ceramics in Japan should be a ferrite at Tokyo Institute of Technology in 1930, and the mass production of ferrite started in 1937. Then, Japanese electro-ceramic industry has led the world on electro-ceramic materials and components until now, especially in the fields of BaTiO3, PZT, PTC thermistor, ZnO varistor and insulating ceramics. In recent years, new electro-ceramic materials, their processes and new devices using them have been still studied actively in Japan. Currently, R&D activities in Asia outside of Japan, and electro-ceramic industries in those areas have been grown steadily.
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Qu, Yuan Fang, Guang Jun Yang, Xiao Lei Li, and Wei Bing Ma. "Study of Graphite/Bakelite/BaTiO3-Based PTC Ceramics Composite." Key Engineering Materials 280-283 (February 2007): 345–48. http://dx.doi.org/10.4028/www.scientific.net/kem.280-283.345.

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The influence of grahtite and bakelite content of Graphite/Bakelite/BaTiO3-based PTC ceramic composite on their properties was studied. It was found that the composite's room- temperature resistivity was decreased and the PTC intensity was assured. This method offered a new way to solving the problem of high room-temperature resistivity of the BaTiO3-based PTC ceramic.
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Takada, Masaaki, Shinichi Umino, and Koji Hayashi. "Properties of PTC Ceramics/Metal Sintered Compact." Journal of the Japan Institute of Metals 56, no. 3 (1992): 303–7. http://dx.doi.org/10.2320/jinstmet1952.56.3_303.

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Michiue, Masakuni, Hideji Igarashi, and Kiyoshi Okazaki. "Measurement of Internal Stress in PTC Ceramics." Japanese Journal of Applied Physics 24, S3 (January 1, 1985): 110. http://dx.doi.org/10.7567/jjaps.24s3.110.

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Dissertations / Theses on the topic "PTC ceramics"

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Roberts, Arwel W. "BaTiO₃ ceramics for PTC applications." Thesis, Durham University, 1994. http://etheses.dur.ac.uk/1428/.

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Koller, Kryštof. "Vliv chemických látek na stabilitu PTC keramiky na bázi BaTiO3." Master's thesis, Vysoké učení technické v Brně. Fakulta chemická, 2021. http://www.nusl.cz/ntk/nusl-444548.

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The thesis deals with the study of the influences of selected groups of chemical agents on the stability of PTC ceramics based on BaTiO3. The experimental part includes elaboration of methodology for determination of these influences, their evaluation, including the hypotheses for their description, and evaluation of groups of chemical agents having these influences.
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Blateau, Vincent 1979. "PIC simulation of a ceramic-lined Hall-effect thruster." Thesis, Massachusetts Institute of Technology, 2002. http://hdl.handle.net/1721.1/29753.

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Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 2002.
Includes bibliographical references (leaves 99-101).
A full Particle-In-Cell code, written by James Szabo [23], was used to model a 50W TAL and 3kW SPT thruster. This code treats single and double ions, neutrals and electrons as particles, moved forward by a leapfrog algorithm at each timestep, matching the lowest of the plasma and the cyclotron times. At the end of each timestep, a successive-over-relaxation algorithm solves the Gauss' formulation of the Poisson equation. Collisions include electron-neutral single and double ionization, and elastic scattering, electron-ion double ionization, ion-neutral elastic scattering and chargeexchange. A few tricks are used to decrease the computation time: superparticles, an artificial permittivity factor and lighter-than-physical ions. We modified this code to track the different components governing the thruster efficiency, and to map average internal data in the thruster. We used these tools to track changes with higher-than- nominal voltage (600, 900 and 1200V) for the 50W, 300V mini-TAL, optimizing efficiency vs. magnetic fields at each voltage. We further modified the code to model a 3kW SPT thruster. These modifications include ceramic wall secondary electron emission, a new boundary condition model for the Poisson solver at ceramic walls, an improved sheath model, and a new anomalous diffusion algorithm. Converged results with low anomalous diffusion diffusion were obtained, along with intermediary results with higher diffusion.
by Vincent Blateau.
S.M.
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Rouš, Jaroslav. "Automat pro výrobu keramických forem pro technologii přesného lití." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2010. http://www.nusl.cz/ntk/nusl-229294.

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The theme of this thesis is the engineering design of the automaton for the ceramic moulds production for the shell casting technology. In the first part of the thesis I occupy with the design of the mechanical part of the machine including the kinematic, dynamic and strength calculations of the chosen engineering compositions and components. In the next part of the thesis I design the control part of the machine.
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Durif, Charlotte. "Elaboration de membranes non-oxydes de type SiBC pour la maîtrise de la contamination dans les réacteurs à eau pressurisée." Thesis, Montpellier, 2017. http://www.theses.fr/2017MONTT179/document.

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Ce travail de thèse a porté sur le développement de membranes céramiques pour la filtration de colloïdes issus de la corrosion dans le circuit primaire des REP. La voie des polymères précéramiques a été mise en œuvre par la synthèse d’un polyborocarbosilane (PBC) à partir d’allylhydridopolycarbosilane conduisant à une céramique de type SiBC. Des billes de PMMA mono disperses d’une taille de 1,5 et 0,3 µm ont été préparées pour servir d’agent porogène pour créer une porosité contrôlée. Des objets micro-cellulaires 3D de forme circulaire ont été élaborés par pressage uni-axial avec ajout de billes de PMMA commercial pour servir de support macroporeux. Une étude de cristallinité à haute température (> 1000 °C) a été réalisée, montrant son influence sur la stabilité du matériau. La couche sélective a été préparée par dip-coating à partir de différentes formulations de barbotine contenant du PBC et les billes de PMMA élaborées. La stabilité physico-chimique des supports micro-cellulaires a été étudiée grâce à des essais de vieillissement en micro-autoclave en milieu primaire simulé. La résistance à la filtration a été testée grâce à un essai sur un dispositif de filtration connecté à un moyen d’essai de laboratoire permettant de simuler les conditions des REP
This work has been focused on the development of ceramic membranes for the filtration of colloids resulting from corrosion in the primary loop of PWR. SiBC ceramics were synthesized by the preceramic polymers route from a polyborocarbosilane (PBC) obtained from allylhydridopolycarbosilane. Single-dispersed PMMA beads with a size of 1.5 and 0.3 μm were prepared to be used as a porogen agent to lead to a controlled porosity of the selective layer. 3D micro-cellular objects with a circular shape were developed by uni-axial pressing with the addition of commercial PMMA beads to serve as a macroporous support. A crystallinity study at high temperature (> 1000 ° C) was carried out showing its influence on the stability of the material. The selective layer was prepared by dip-coating from various slurry formulations containing PBC and the prepared PMMA beads. The chemical and physical stability of the microcellular supports was studied by ageing tests in a simulated primary water chemistry. The filtration resistance was tested by means of tests on a filtration device connected to a laboratory loop which simulates the conditions of the PWRs
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Nagaiah, Narasimha. "NOVEL CONCEPTUAL DESIGN AND ANLYSIS OF POLYMER DERIVED CERAMIC MEMS SENSORS FOR GAS TURBINE ENVIRONMENT." Master's thesis, University of Central Florida, 2006. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/4086.

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Technical challenges for developing micro sensors for Ultra High Temperature and turbine applications lie in that the sensors have to survive extremely harsh working conditions that exist when converting fuel to energy. These conditions include high temperatures (500-1500°C), elevated pressures (200-400 psi), pressure oscillations, corrosive environments (oxidizing conditions, gaseous alkali, and water vapors), surface coating or fouling, and high particulate loading. Several technologies are currently underdeveloped for measuring these parameters in turbine engines. One of them is an optical-based non-contact technology. However, these nondirective measuring technologies lack the necessary accuracy, at least at present state. An alternative way to measure these parameters without disturbing the working environments is using MEMS type sensors. Currently, the techniques under development for such harsh environment applications are silicon carbide (SiC) and silicon nitrite (Si3N4) –based ceramic MEMS sensors. But those technologies present some limitation such as narrow processing method, high cost (materials and processing cost), and limited using temperatures (typically < 800 C). In this research we propose to develop two sensors based on recently developed polymer-derived ceramics (PDCs): Constant Temperature Hot wire Anemometer, temperature/heat-flux sensor for turbine applications. PDC is a new class of high temperature ceramics. As we shall describe below, many unique features of PDCs make them particularly suitable for the proposed sensors, including: excellent thermo-mechanical properties at high temperatures, enable high temperature operation of the devices; various well-developed processing technologies, such as injection molding,photolithography, embossing, DRIE etching and precise machining, can be used for the fabrication of the devices; and tunable electric conductivity, enable the proposed sensors fabricated from similar materials, thus reliability considerations associated with thermal mismatch, which is a big concern when using MEMS-based sensors at elevated temperatures, will be minimized.
M.S.M.E.
Department of Mechanical, Materials and Aerospace Engineering;
Engineering and Computer Science
Mechanical Engineering
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Gottardo, Laura. "Élaboration, traitement et propriétés des fibres SiBCN obtenues par voie PDC." Thesis, Lyon 1, 2009. http://www.theses.fr/2009LYO10200.

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Les matériaux céramiques à base de bore dans le système quaternaire Si-B-C-N présentent des propriétés de grand intérêt grâce aux liaisons covalentes et à la faible mobilité des éléments bore et silicium dans leurs phases nitrure et carbure, ce qui amène une grande fiabilité mécanique et une bonne stabilité thermique. Ces dernières années, la voie « polymères précéramiques » est devenue la plus intéressante pour la préparation des ce type de céramiques avancées. En utilisant la thermolyse de polymères, une large variété de céramiques dérivées de polymères précéramiques peut être produite à partir de précurseurs moléculaires, en contrôlant la structure de l'unité monomérique, la polymérisation et la procédure de thermolyse. Notamment la thermolyse directe des polymères est une voie compatible avec plusieurs types de techniques de mise en forme, entre autres l'infiltration ou le filage, qui offrent la possibilité de réaliser structures et objets avec des formes complexes avec une approche simple et à faible coût. La première génération de fibres SiBCN a été obtenue à partir du polymère de type [B(C2H4SiCH3NCH3)3]n. Celle-ci présentait de bonnes propriétés mécaniques et une bonne stabilité thermique. Ce manuscrit présente une étude sur le développement de ce type de polymères, en particulier l'optimisation du filage et de la qualité de fibres à travers la modification des voies de synthèse et des traitements de thermolyse. De plus, une élaboration de nouveaux précurseurs moléculaires est développée afin de produire une nouvelle génération de fibres SiBCN
Boron-based ceramic materials in the quaternary Si-B-C-N system are of great interest because of their covalent bonding and the poor mobility of boron and silicon elements in their respective nitride and carbide which both provide mechanical reliability and high temperature stability. In recent years, the PDCs route became of increasing interest for the preparation of such advanced ceramics. Using the general polymer thermolysis route, a large variety of net-shaped polymerderived ceramics can be built up from molecular units and shaped by controlling the structure of the molecular units as well as the polymerization and thermolysis procedures. Interestingly, the direct polymer thermolysis route makes polymers compatible with many shaping techniques such as infiltration or melt-spinning offering the opportunity to realize complex shapes/structures in a simple and cost-efficient way.The first generation of such fibers obtained from a polymer type [B(C2H4SiCH3NCH3)3]n showed good mechanical properties and thermal stability. This document is about the development of such a polymer in order to optimize spinnability and fibers quality throught synthesis modification and thermolysis treatments. Moreover, design of new preceramic polymers is investigate to produce a new generation of SiBCN fibers
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Yang, Hongjiang. "Synthesis, Processing and Characterization of Polymer Derived Ceramic Nanocomposite Coating Reinforced with Carbon Nanotube Preforms." Master's thesis, University of Central Florida, 2014. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/6387.

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Ceramics have a number of applications as coating material due to their high hardness, wear and corrosion resistance, and the ability to withstand high temperatures. Critical to the success of these materials is the effective heat transfer through a material to allow for heat diffusion or effective cooling, which is often limited by the low thermal conductivity of many ceramic materials. To meet the challenge of improving the thermal conductivity of ceramics without lowering their performance envelope, carbon nanotubes were selected to improve the mechanical properties and thermal dispersion ability due to its excellent mechanical properties and high thermal conductivity in axial direction. However, the enhancements are far lower than expectation resulting from limited carbon nanotube content in ceramic matrix composites and the lack of alignment. These problems can be overcome if ceramic coatings are reinforced by carbon nanotubes with good dispersion and alignment. In this study, the well-dispersed and aligned carbon nanotubes preforms were achieved in the form of vertically aligned carbon nanotubes (VACNTs) and Buckypaper. Polymer derived ceramic (PDC) was selected as the matrix to fabricate carbon nanotube reinforced ceramic nanocomposites through resin curing and pyrolysis. The SEM images indicates the alignment of carbon nanotubes in the PDC nanocomposites. The mechanical and thermal properties of the PDC nanocomposites were characterized through Vickers hardness measurement and Thermogravimetric Analysis. The ideal anisotropic properties of nanocomposites were confirmed by estimating the electrical conductivity in two orthogonal directions.
M.S.M.E.
Masters
Mechanical and Aerospace Engineering
Engineering and Computer Science
Mechanical Engineering; Mechanical Systems Track
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Mahfouz, Rana. "Insulinorésistance musculaire induite par les céramides : étude des mécanismes d'action et de l'implication du transporteur CERT." Thesis, Paris 6, 2015. http://www.theses.fr/2015PA066012/document.

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L'obésité et le diabète de type 2 sont associés à la sédentarité et à une alimentation riche en graisses. En effet, les acides gras saturés s'accumulent dans les tissus non adipeux, comme les muscles squelettiques pour générer des lipides appelés céramides (CER). Mon projet de thèse s'est articulé en deux parties dont l'objectif est d'empêcher les CER d'agir. Nous avons montré que, selon la structure de la membrane plasmique, les CER altèrent la voie de signalisation insulinique en ciblant la PKB, protéine clef de la voie insulinique, via la voie PKC? dans les myotubes L6 et la voie PP2A dans les myotubes C2C12. Nous avons aussi mis en évidence que les CER altèrent la sensibilité à l'insuline via la voie PKC? dans les cellules musculaires humaines. Une fois les CER produits au niveau du réticulum endoplasmique (RE), ils sont transportés au Golgi par un transporteur CERT pour y être métabolisés en sphingomyéline (SM) et des études ont montré que la transformation des CER en SM pouvait être une étape cruciale pour empêcher les CER d'agir. Dans plusieurs modèles d'insulino-résistance musculaire, l'expression de CERT est diminuée et nous avons démontré l'importance du transport des céramides du RE vers le Golgi en inhibant artificiellement l'activité ou l'expression de CERT. A l'opposé, la surexpression de CERT améliore la sensibilité à l'insuline dans les cellules musculaires dans des conditions lipotoxiques. Nos résultats montrent que CERT joue un rôle crucial dans les mécanismes conduisant au développement de l'insulinorésistance musculaire puisque sa présence est essentielle pour le maintien d'un trafic normal des CER entre le RE et le golgi
Obesity and type 2 diabetes are associated with a sedentary lifestyle and a diet rich in fat. Indeed, saturated fatty acids accumulate in non-adipose tissue such as skeletal muscle to generate lipids called ceramides (CER). My thesis project was divided into two parts with the objective to prevent CER to act. We have shown that, depending on the structure of the plasma membrane, CER alter the insulin signaling pathway by targeting PKB, a key insulin signalling protein, via a PKCζ pathway in L6 myotubes and a PP2A pathway in C2C12 myotubes. We also demonstrated that CER affect insulin sensitivity via the PKCζ pathway in human muscle cells. Once CER generated in the endoplasmic reticulum (ER), they are transported to the Golgi by a carrier called CERT to be metabolized into sphingomyelin (SM). Studies have shown that the transformation of CER into SM could be a crucial step to prevent CER to act. In several muscle insulin resistance models, expression of CERT is decreased and we demonstrated the importance of the transport of ceramide from the ER to the Golgi by inhibiting artificially the activity or the expression of CERT. In contrast, overexpression of CERT enhances insulin sensitivity in muscle cells in lipotoxiques conditions. Our results show that CERT plays a crucial role in mechanisms leading to the development of muscle insulin resistance since its presence is essential for maintaining normal traffic of CER between the ER and the Golgi
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Santos, Jerre Cristiano Alves dos. "Estudo do comportamento PTCR em cerâmicas de BCT dopadas com íons terra raras." Universidade Federal de Sergipe, 2012. https://ri.ufs.br/handle/riufs/5346.

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Barium titanate (BaTiO3 - BT) is a ferroelectric material with important technological applications. When partially doped with trivalent cations at the barium sublattice or pentavalent at the titanium sublattice, BaTiO3-based ceramics exhibit a semiconductive character, accompanied by a Positive Temperature Coefficient of Resistivity (PTCR). Several ways of BT modifications have been proposed in literature, as example, the use of different synthesis methods and the doping with different ions. Therefore, in the present work we have as objective the synthesis, sintering and electrical characterization of the rare earth ions (RE = La3+, Y3+, Er3+, Nd3+ e Eu3+) doped barium calcium titanate ceramics (Ba0,77Ca0,227RE0,003TiO3 BCT_RE) in order to study mainly the PTCR behavior. The powder synthesis was done by the polymeric precursor method followed by the sinterization at reducing atmosphere during the heating up ramp and different atmosphere during cooling down ramp in order to investigate the atmosphere and dopant effect on PTCR behavior. The characterization was done using the Differential Thermal Analysis, Thermogravimetry, Scanning Differential Calorimetry, X-ray Powder Diffraction, Scanning Electron Microscopy and Impedance Spectroscopy techniques. The calcined powder at 600ºC/4h presented majority BCT phase and after sintering at 1350ºC/6h, a small amount of Ba6Ti17O40 phase was observed. The sintered ceramics presented a homogeneous grain size distribution but with the presence of a secondary phase at the grain boundary for all compositions, and Curie temperature at about 120ºC. The PTCR characteristics of the ceramics were studied as a function of the sintering atmosphere and dopant type. In summary, all the samples, exception of the Eu doped samples, presented PTCR behavior in all the studied conditions. .
O titanato de bário (BaTiO3 - BT) é um material ferroelétrico com importantes aplicações tecnológicas. Quando dopado com íons trivalentes no sítio do bário ou pentavalentes no sítio do titânio, cerâmicas de BaTiO3 exibem um caráter semicondutor, acompanhado por um coeficiente positivo da resistência com o aumento da temperatura (PTCR). Diversas formas de modificação do BT têm sido sugeridas na literatura, por exemplo, a utilização de diferentes métodos de síntese e a dopagem com diferentes íons. Dessa forma, no presente trabalho tivemos como objetivo a síntese, a sinterização e a caracterização elétrica de cerâmicas de titanato de bário e cálcio (Ba0,77Ca0,227RE0,003TiO3 BCT_RE) dopados com íons terras raras (RE = La3+, Y3+, Er3+, Nd3+ e Eu3+), visando principalmente o estudo do comportamento PTCR. A síntese dos pós foi realizada pelo método dos precursores poliméricos, seguido pela sinterização em atmosfera redutora durante o aquecimento e diferentes atmosferas no resfriamento com o intuito de investigar a influência da atmosfera e do dopante no comportamento PTCR. A caracterização foi feita utilizando as técnicas de Análise Térmica Diferencial, Termogravimetria, Calorimetria Exploratória Diferencial, Difração de Raios X, Microscopia Eletrônica de Varredura e Espectroscopia de Impedância. Os pós calcinados a 600ºC/4h apresentaram fase majoritária BCT e após sinterizados a 1350ºC/6h foi observada a presença da fase Ba6Ti17O40. As cerâmicas sinterizadas apresentaram uma distribuição homogênea de tamanho de grão, porém com a presença de uma segunda fase na região de contorno de grão para todas as composições, com temperatura de Curie em torno de 120ºC. As características PTCR das cerâmicas foram estudadas em função da atmosfera de sinterização e do tipo do dopante. Em resumo, todas as amostras, com exceção das dopadas com Eu, apresentaram comportamento PTCR para todas as condições estudadas.
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Books on the topic "PTC ceramics"

1

Gierszewski, Paul Joseph. Ceramic sphere-pac breeder design for fusion blankets. [Mississauga, Ont.]: Canadian Fusion Fuels Technology Project, 1991.

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Commission, Monopolies and Mergers. The Morgan Crucible Company plc and Manville Corporation: A report on the merger situation. London: H.M.S.O., 1991.

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Commission, Monopolies and Mergers. The Morgan Crucible Company plc and Manville Corporation: A report on the merger situation. London [England]: HMSO, 1991.

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D, Sullivan J., Canadian Fusion Fuels Technology Project., and International Symposium on Fusion Nuclear Technology. (2nd : 1991 : Karlsruhe, Germany), eds. Canadian ceramic breeder sphere-pac technology: Capability and recent results. [Mississauga, Ont.]: Canadian Fusion Fuels Technology Project, 1991.

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W, McCauley James, Ceramic Armor Materials by Design Symposium (2001 : Wailea, Maui, Hawaii)., and Pac Rim International Conference on Advanced Ceramics and Glass (4th : 2001 : Wailea, Maui, Hawaii)., eds. Ceramic armor materials by design: Proceedings of the Ceramic Armor Materials by Design Symposium held at the Pac Rim IV International Conference on Advanced Ceramics and Glass, November 4-8, 2001 in Wailea, Maui, Hawaii. Westerville, Ohio: American Ceramic Society, 2002.

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Ltd, ICON Group. UNIVERSAL CERAMIC MATERIALS PLC: Labor Productivity Benchmarks and International Gap Analysis (Labor Productivity Series). 2nd ed. Icon Group International, Inc., 2000.

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Ltd, ICON Group. UNIVERSAL CERAMIC MATERIALS PLC: International Competitive Benchmarks and Financial Gap Analysis (Financial Performance Series). 2nd ed. Icon Group International, Inc., 2000.

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Ltd, ICON Group. THAI-GERMAN CERAMIC INDUSTRY PLC CO LTD: International Competitive Benchmarks and Financial Gap Analysis (Financial Performance Series). 2nd ed. Icon Group International, Inc., 2000.

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Terra Sculptura, Terra Pictura: Ceramics from the Classic Modernnists : Georges Braque, Marc Chagall, Jean Cocteau, Raoul Dufy, Joan Miro, Pablo Pic. Univ of Pennsylvania Pr, 1995.

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Book chapters on the topic "PTC ceramics"

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Li, Xiao Lei, Yuan Fang Qu, Wei Bing Ma, and Zhan Shen Zheng. "Preparation of Ni/BaTiO3 Composites and PTC Effect." In High-Performance Ceramics III, 341–44. Stafa: Trans Tech Publications Ltd., 2007. http://dx.doi.org/10.4028/0-87849-959-8.341.

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Qu, Yuan Fang, Hua Tao Wang, Xiao Lei Li, and Wei Bing Ma. "Effects of Glass-Additives on the Properties of Ni/Ceramic PTC Composites." In High-Performance Ceramics III, 337–40. Stafa: Trans Tech Publications Ltd., 2007. http://dx.doi.org/10.4028/0-87849-959-8.337.

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Qu, Yuan Fang, Guang Jun Yang, Xiao Lei Li, and Wei Bing Ma. "Study of Graphite/Bakelite/BaTiO3-Based PTC Ceramics Composite." In High-Performance Ceramics III, 345–48. Stafa: Trans Tech Publications Ltd., 2007. http://dx.doi.org/10.4028/0-87849-959-8.345.

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Zhou, Dong Xiang, Huan Liu, Shu Ping Gong, and Dao Li Zhang. "Preparation of Multilayer Barium Titanate PTC Thermistor with Low Room Temperature Resistance." In High-Performance Ceramics III, 1921–24. Stafa: Trans Tech Publications Ltd., 2007. http://dx.doi.org/10.4028/0-87849-959-8.1921.

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Liu, Huan, Shu Ping Gong, Dong Xiang Zhou, Chun Fang Cheng, Zhi Ping Zheng, and Yun Xiang Hu. "Microstructure and Electrical Properties of BaTiO3-Based PTC Ceramics Prepared from Nanopowders." In High-Performance Ceramics V, 456–58. Stafa: Trans Tech Publications Ltd., 2008. http://dx.doi.org/10.4028/0-87849-473-1.456.

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Sun, Xiao Long, Wei Bing Ma, and Xiao Lei Li. "(Ba,Sr,Pb) TiO3-BaPbO3 System Compound PTC Ceramic." In High-Performance Ceramics III, 365–68. Stafa: Trans Tech Publications Ltd., 2007. http://dx.doi.org/10.4028/0-87849-959-8.365.

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Zhou, Zhi Gang, Zi Long Tang, and Zhong Tai Zhang. "Impedance Analysis Study on the Sensing Process of BaTiO3 Based PTC Ceramics in CO Gas." In High-Performance Ceramics III, 369–72. Stafa: Trans Tech Publications Ltd., 2007. http://dx.doi.org/10.4028/0-87849-959-8.369.

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Gong, Shu Ping, C. Huang, Dong Xiang Zhou, and Zhi Ping Zheng. "Liquid Desiccant Drying Method for Gelcasting PTC Ceramics Based on BaTiO3." In Key Engineering Materials, 665–68. Stafa: Trans Tech Publications Ltd., 2007. http://dx.doi.org/10.4028/0-87849-410-3.665.

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Okada, Masuo, Takashi Iijima, and Motofumi Homma. "New Composite PTC Materials Based on PbTiO3-TiO2." In Ceramic Microstructures ’86, 697–706. Boston, MA: Springer US, 1987. http://dx.doi.org/10.1007/978-1-4613-1933-7_70.

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Qu, Yuan Fang, Juan Du, Wei Bing Ma, and Xiao Lei Li. "Ni/Graphite/BaTiO3 PTCR Composites." In High-Performance Ceramics III, 353–56. Stafa: Trans Tech Publications Ltd., 2007. http://dx.doi.org/10.4028/0-87849-959-8.353.

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Conference papers on the topic "PTC ceramics"

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Takeda, H., H. Harinaka, Y. Hoshi, T. Kinoshida, T. Nishida, K. Uchiyama, T. Shimada, Y. Katsuyama, and T. Shiosaki. "Fabrication and PTC Properties of Lead-Free Element-Modified Barium Titanate Semiconducting Ceramics with Tc130°C." In 2007 Sixteenth IEEE International Symposium on the Applications of Ferroelectrics. IEEE, 2007. http://dx.doi.org/10.1109/isaf.2007.4393408.

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Cao, Minghe, Dong-xiang Zhou, and Shuping Gong. "Influence of Ca on electric properties of Ba1-xCaxTi1.02O3 PTC ceramics with low room-temperature resistivity." In International Conference on Sensors and Control Techniques (ICSC2000), edited by Desheng Jiang and Anbo Wang. SPIE, 2000. http://dx.doi.org/10.1117/12.385523.

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Cui, T., G. Shao, L. An, W. Wang, Y. J. Chao, P. S. Lam, and A. Mendez-Torres. "Time and Temperature Dependent Property of a Sensor Candidate Material: Polymer Derived Ceramics (PDC)." In ASME 2014 Pressure Vessels and Piping Conference. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/pvp2014-29058.

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The piezoresistivity and the micro fabrication capability have made the polymer derived ceramics (PDCs) an excellent candidate material for high temperature sensors. In this study, it was found that PDCs also exhibit creep and stress relaxation properties. Its electric resistance may change with time under certain loading conditions. In addition, the creep/stress relaxation rate is sensitive to temperature. It is demonstrated that even PDC materials have been processed at high temperatures and formed ceramic structure, they retain certain polymeric characteristics. Due to the piezoresistivity properties of PDC and its resilience to harsh environment, in particular, the predicted resistance to radiation field, the PDC based sensors are ideal for use as sensing media that can be deployed to important to safety (ITS) structures in nuclear systems, such as cooling water system and coolant pumps in light water reactors (LWRs).
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Nagamatsu, Soichi, Kazuyuki Mizuhara, Yukio Matsuda, Akio Iwanaga, and Shoji Ishiwata. "Current Status of Industrial and Automotive Ceramic Gas Turbine R&D in Japan." In ASME 1991 International Gas Turbine and Aeroengine Congress and Exposition. American Society of Mechanical Engineers, 1991. http://dx.doi.org/10.1115/91-gt-101.

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The current status of Japan’s national Ceramic Gas Turbines (CGTs) projects is overviewed. The Japanese Ministry of International Trade and Industry (MITI) is conducting two national R&D projects on CGT. These include a project on 300kW industrial CGTs for co-generation and mobile power generation use and a project on 100kW CGT for automotive use. The 300kW project was started in 1988, and is scheduled to develop three kinds of CGTs over nine years. The New Energy and Industrial Technology Development Organization (NEDO) is the main contractor, and three groups of private industries are sub contractors. Three national research institutes are involved in the project to conduct supportive research of ceramic materials and engine components. The 100kW project has started in 1990, and is scheduled to develop a single shaft automotive CGT over seven years. Petroleum Energy Center (PEC) and JARI are the main contractors with the cooperation of several petroleum and automotive companies. The goals for the two projects are 42% and higher for thermal efficiency at a turbine inlet temperature of 1350C. Such targets could not be achieved without applying high temperature ceramics to the engine components. Therefore many R&D objectives are directed towards developing the ceramic components which have a higher flexure strength and fracture toughness. Currently, 300kW base metal gas turbine engines are being developed to prove the design concepts. Blade shapes suitable to ceramics are being studied by the FEM method. Forming and manufacturing large components are also being studied, and some ceramics components have been successfully made.
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Curhan, Jeffrey A. "Improved Vehicle Heating with the Use of PTC Ceramic." In International Congress & Exposition. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 1990. http://dx.doi.org/10.4271/900220.

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Itoh, Takane, and Hidetomo Kimura. "Status of the Automotive Ceramic Gas Turbine Development Program." In ASME 1992 International Gas Turbine and Aeroengine Congress and Exposition. American Society of Mechanical Engineers, 1992. http://dx.doi.org/10.1115/92-gt-002.

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The seven-year program, designated “Research and Development of Automotive CGT” commenced in June 1990 with the object of demonstrating the potential advantages of ceramic gas turbine engines for automotive use. This program has been being conducted by the Petroleum Energy Center (PEC) with the support of the Ministry of International Trade and Industry. The engine demonstration project in this program is being handled by a team from the Japan Automobile Research Institute, Inc., (JARi). This paper describes the activities of the first year of the seven-year program, and includes the project goals and objectives, the program schedule, and the first-stage design of an experimental automotive ceramic gas turbine (CGT) engine and its components. The basic engine is a 100kW, single-shaft gas turbine engine having a turbine inlet temperature of 1350°C and a rotor speed of 110,000 rpm. The primary engine components including the turbine hot flow path components have been designed using monolithic ceramics and are scheduled to be produced during the second year of the program.
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O'Connor, K. A., J. Smith, and R. D. Curry. "Dielectric characterization of polymer-ceramic nanocomposites." In 2009 IEEE Pulsed Power Conference (PPC). IEEE, 2009. http://dx.doi.org/10.1109/ppc.2009.5386294.

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Rossi, J. O., L. P. Silva Neto, and A. R. Silva. "Study of HV dielectric ceramics for applications in compact pulsed power." In 2011 IEEE Pulsed Power Conference (PPC). IEEE, 2011. http://dx.doi.org/10.1109/ppc.2011.6191465.

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Freese, Douglas, Gang Shao, and Chengying Xu. "Polymer-Derived Ceramic Sensors for Temperature Measurement in Harsh Environment." In ASME Turbo Expo 2013: Turbine Technical Conference and Exposition. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/gt2013-96031.

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Development of an ultra-high temperature sensor advocates numerous applications in a variety of diverse fields. Combustion turbine engine advancements are predominately the benefactors of high temperature measurement capabilities; founded upon the principle of higher combustion reaction efficiency. The interior combustion chamber of a gas turbine is an extremely hostile environment for any typical material, especially a measurement component. Implementing the conductive properties and high temperature stability of a polymer derived ceramic (PDC) offers a solution to this predicament. Complementing the virtuous mechanical properties of the unique ceramic is micro-machinability and tunable electric characteristics established from the precursor compounds. The thermo-electric qualities of the PDC prepare formulation of a relationship between the changing temperatures of the research environment with respect to the internal resistance of the ceramic. An elected measurement system will actively monitor a PDC sensory circuit as well as reference thermocouple temperature. Series of response experiments were performed to characterize the functionality of the sensor within the high temperature environment.
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Wang, S., J. Zhang, H. Yang, Z. Zhang, and T. Shu. "Glass ceramic breakdown characteristics under repetitively pulsed condition." In 2011 IEEE Pulsed Power Conference (PPC). IEEE, 2011. http://dx.doi.org/10.1109/ppc.2011.6191427.

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Reports on the topic "PTC ceramics"

1

Gardner, J. A., Ruiping Wang, R. Schwenker, W. E. Evenson, R. L. Rasera, and J. A. Sommers. PAC spectroscopy of electronic ceramics. Office of Scientific and Technical Information (OSTI), December 1991. http://dx.doi.org/10.2172/10147074.

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Gardner, J. A., Ruiping Wang, R. Schwenker, W. E. Evenson, R. L. Rasera, and J. A. Sommers. PAC spectroscopy of electronic ceramics. Office of Scientific and Technical Information (OSTI), January 1991. http://dx.doi.org/10.2172/5236444.

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Crawford, Charles L. Letter report on PCT/Monolith glass ceramic corrosion tests. Office of Scientific and Technical Information (OSTI), September 2015. http://dx.doi.org/10.2172/1221777.

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Crawford, Charles L., and Christopher S. Dandeneau. Final Letter Report on PCT/monolithic Long-Term Glass Ceramic Corrosion Tests M3NT-18SR030105147. Office of Scientific and Technical Information (OSTI), March 2018. http://dx.doi.org/10.2172/1430086.

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