Relevant bibliographies by topics / Conductivity and resistance matrix

Academic literature on the topic 'Conductivity and resistance matrix'

Author: Grafiati
Published: 30 May 2022
Last updated: 31 May 2022

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Journal articles on the topic "Conductivity and resistance matrix"

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Sugio, Kenjiro, Keisuke Kono, Yong Bum Choi, and Gen Sasaki. "Evaluation of Effective Thermal Conductivity of Metal Matrix Composites by Using Image-Based Calculation." Materials Science Forum 941 (December 2018): 1939–43. http://dx.doi.org/10.4028/www.scientific.net/msf.941.1939.

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Interfacial thermal resistance in Al-SiC composites was evaluated by comparing the measured thermal conductivity and the calculated thermal conductivity. Al-20vol.%SiC composites changing SiC particle size, 3 μm to 30 μm, was fabricated by spark plasma sintering and heat treatment. Effective thermal conductivity was measured with the steady state thermal conductivity measuring device. Effective thermal conductivity was also calculated by using SEM image and the measured relative density. Comparing the measured thermal conductivity and the calculated thermal conductivity, interfacial thermal resistance in Al-SiC composites was evaluated as about 1.0x10-8 (m2K)/W.
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Aoki, Toi, Noboru Nakayama, Masaomi Horita, and Hiroaki Fukui. "Influence of Elastic Modulus of Matrix on Conductivity of VGCF Dispersed in Plastic Matrix." Materials Science Forum 1016 (January 2021): 243–49. http://dx.doi.org/10.4028/www.scientific.net/msf.1016.243.

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Pressure-sensitive conductive material is used for various pressure sensors consists of a polymer nanocomposite with carbon nanotubes (VGCF). And the resistance in it were changed by adding applied load. Recently, carbon nanotubes (VGCF) has drawn attention as a function filler that imparts various functions to a resin, including electrical properties. In polycarbonate (PC) composite with VGCF, the resistance decreases with increase in applied load. And increase of the addition amount of VGCF was enhanced the mechanical properties and electronic properties. In addition, this conclusion suggested that strain of PC/VGCF caused reducing the resistance. Therefore, changing matrix is predictably effective on electrical properties in pressure-conductive materials. In the present study, we used various matrix had different elastic modulus. The addition amount of VGCF was 12.5% volume rate. We made silicone/VGCF and polyethylene (PE)/VGCF and polycarbonate (PC)/VGCF by twin screw extruder and injection moldings. To clarify the influence of elastic modulus of matrix on conductivity of VGCF dispersed plastic matrix composites. The experimental results showed that conductive property of pressure-sensitive conductive materials is related to elastic modulus of them.
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Siddiqui, M. U., U. Hayat, Abul Arif, and N. Saheb. "On the thermal conductivity of spark plasma sintered alumina hybrid nanocomposites: Estimation modeling and experimental validation." Science of Sintering 51, no. 1 (2019): 101–14. http://dx.doi.org/10.2298/sos1901101s.

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In the current work, an improved model to estimate the thermal conductivity of spark plasma sintered nanocomposites is presented. In the developed model, the thermal conductivity of the matrix was modeled as a function of the average matrix crystallite size rather than taking a constant matrix thermal conductivity. The model has been validated against experimentally measured thermal conductivity of Al2O3-SiC-CNT hybrid nanocomposites. Using the experimental and modeling results, it was shown that the addition of SiC and CNT inclusions to alumina resulted in a decrease in its thermal conductivity. The main reason for this decrease was found to be the reduction in the thermal conductivity of the alumina matrix itself because of the reduction in the crystallite size. Additional reduction in the composite thermal conductivity was due to the matrix-inclusion interface resistance and porosity. The predicted and measured thermal conductivities were found to be in good agreement.
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Zhang, M., Peng Cheng Zhai, and Qing Jie Zhang. "The Effective Conductivity of Multiphase Composites with Imperfect Thermal Contact at Constituent Interfaces." Materials Science Forum 631-632 (October 2009): 127–32. http://dx.doi.org/10.4028/www.scientific.net/msf.631-632.127.

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This paper studies the effective thermal conductivity of multiphase composite in which a thermal boundary resistance exists at constituent interfaces. Based on the theoretical framework of conductivity for binary system composites in the presence of a thermal contact resistance between matrix and inclusion given by Y. Benveniste and T. Miloh (1986), the fundamental concept is generalized for the case of multiphase composites with imperfect contact which permits a temperature discontinuity between matrix and inclusions of different phases. A micromechanics model, the “generalized self-consistent scheme (GSCS)” based on a particle-matrix embedding in the effective medium, is generalized to evaluate the effective conductivity of multiphase medium with imperfect thermal contact at constituent interfaces. Numerical results are given for three-phase particulate composites with spherical particles to illustrate the effect of imperfect interfaces on the effective thermal conductivity of multiphase composites.
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Li, Xiao Tuo, Xin Yu Fan, Ying Dan Zhu, and Juan Li. "Thermal Modeling of Randomly Distributed Multi-Walled Carbon Nanotube/Polymer Composites." Advanced Materials Research 548 (July 2012): 123–27. http://dx.doi.org/10.4028/www.scientific.net/amr.548.123.

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A three-dimensional computational model based on the finite element method was developed to predict the thermal properties of randomly distributed multi-walled carbon nanotube (MWCNT)/polymer composites. The numerical results agree very well with the experimental data for MWCNT/epoxy composites with the MWCNT loading below ~10 vol% at the interfacial thermal resistance of ~1.0×10-8 m2K/W, which may give insight into the relationship between the thermal behavior of MWCNT-matrix interfaces and the thermal conductivity of composites. This model is also a useful tool to evaluate the effects of MWCNT-matrix interfacial thermal resistance, volume fraction, thermal conductivity and diameter of MWCNTs on the thermal conductivity of other types of MWCNT/ polymer composites.
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Stankevich, Stanislav, Olga Bulderberga, Sergejs Tarasovs, Daiva Zeleniakiene, Maria Omastova, and Andrey Aniskevich. "Electrical Conductivity of Glass Fiber-Reinforced Plastic with Nanomodified Matrix for Damage Diagnostic." Materials 14, no. 16 (August 10, 2021): 4485. http://dx.doi.org/10.3390/ma14164485.

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The electrical conductivity of glass fiber-reinforced plastic (GFRP) with epoxy matrix modified by multiwall carbon nanotubes (MWCNT) was studied. The electrical conductivity of nanomodified lamina and multi-layered GFRP was investigated on several levels using a structural approach. Components of the electrical conductivity tensor for unidirectional-reinforced monolayer were calculated similarly as in micromechanics using the conductivity of the nanomodified matrix. The electrical conductivity of multilayer composite was calculated using laminate theory and compared with values measured experimentally for various fiber orientation angles. Calculated and experimental data were in good agreement. The voltage distribution measured throughout the laminate allowed detecting the damage in its volume. The electrode network located on the laminate surface could determine the location, quantification, and geometry of the damage in the GFRP lamina modified with MWCNT. Experimental and calculated electrical resistance data for GFRP double-cantilever beam specimens were investigated in Mode I interlaminar fracture toughness test. Results demonstrate that electrical resistance could be successfully used for the diagnostic of the crack propagation during interlaminar fracture of the MWCNT-modified GFRP.
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Shaari, N. S., M. H. Ismail, A. Jumahat, M. Zainudin, M. F. A. Manap, and N. Shaari. "Thermal Conductivity of Copper Matrix Composites Reinforced with Multi-wall Carbon Nanotubes." Journal of Physics: Conference Series 2051, no. 1 (October 1, 2021): 012048. http://dx.doi.org/10.1088/1742-6596/2051/1/012048.

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Abstract Carbon nanotubes (CNTs) reinforced with metal matrix composites (MMCs) have attracted an increasing interest due to their promising properties. One of the challenges in metal matrix-CNTs composites research is producing a uniform dispersion of CNTs. A poor dispersion of CNTs within the matrix, attributed to strong CNTs entanglement caused by Van der Waals forces. In this study, Cu/CNTs composites have been successfully fabricated by the powder metallurgy (PM) route. The thermal conductivity of Cu/CNTs composites showed that the thermal conductivity decreased after the incorporation of CNTs. The analysis revealed that the interfacial thermal resistance between the Cu matrix and CNTs plays a significant role in determining the thermal conductivity performances. Besides, the influences of porosity and distribution of CNTs also affected the thermal conductivity results.
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Wieczorek, Jakub, Tomasz Maciąg, Karolina Kowalczyk, and Damian Migas. "Evaluation of thermal properties of MMCp composites with silver alloy matrix." Journal of Thermal Analysis and Calorimetry 142, no. 1 (May 13, 2020): 175–82. http://dx.doi.org/10.1007/s10973-020-09741-5.

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Abstract Silver, silver alloys, and composites with silver matrix are used mainly as electric contacts, circuit-breakers, and slide bearings. Contacts working conditions require as high as possible thermal and electrical conductivity, wear resistance during electric arc work, low susceptibility to tacking, and chemical stability. Unreinforced silver alloys do not meet those expectations, hence increasing interest in metal matrix composites. Reinforcing with ceramic particles improves tribological wear resistance and minimizes formability of silver alloys. At the same time, introduction of ceramic particles decreases thermal and electrical conductivity. In this paper, manufacturing method of silver-based composites reinforced with particles Al2O3, SiC, and glassy carbon was described. Composites were subjected to differential thermal analysis. Furthermore, thermal diffusivity measurements using laser flash method, as well as measurements of linear thermal expansion coefficient using dilatometric method were performed in order to determine heat conductivity of the prepared composites.
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Tang, Jin, Ke Xin Chen, and C. S. Fu. "Preparation and Properties of β-Si3N4/Epoxy Matrix Composite." Key Engineering Materials 336-338 (April 2007): 1350–52. http://dx.doi.org/10.4028/www.scientific.net/kem.336-338.1350.

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Thermally conducting, but electrically insulating, polymer-matrix composites exhibiting low dielectric constant are needed for electronic packaging. For developing such composites, this work used silicon nitride particles as fillers and epoxy as matrix. The thermal conductivity of Si3N4 particles epoxy-matrix composites was increased by up to 31.4 times than that of neat polymer by silane surface treatment of the particles prior to composites fabrication. The increase in thermal conductivity is due to decrease in the filler-matrix thermal contact resistance through the improvement of the interface between matrix and particles. At 45.4 vol. % silane-treated Si3N4 particles only, the thermal conductivity of epoxy-matrix composites reached 9.72W/ (m*K). The dielectric constant was also low (up to 5.0 at 1 MHz). However, Si3N4 addition caused the flexural strength and ductility to decrease from the values of the neat polymer.
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Garnier, B., and F. Danes. "Design of High Thermal Conductivity Particle Filled Polymer Using Effective Thermal Conductivity Models." Materials Science Forum 714 (March 2012): 21–24. http://dx.doi.org/10.4028/www.scientific.net/msf.714.21.

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The context of this work is the enhancement of the thermal conductivity of polymer by adding conductive particles. It will be shown how we can use effective thermal conductivity models to investigate effect of various factors such as the volume fraction of filler, matrix thermal conductivity, thermal contact resistance, and inner diameter for hollow particles. Analytical models for lower bounds and finite element models will be discussed. It is shown that one can get some insights from effective thermal conductivity models for the tailoring of conductive composite, therefore reducing the amount of experimental work.
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Dissertations / Theses on the topic "Conductivity and resistance matrix"

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Tang, Fei. "The Microstructure-Processing-Property Relationships in an Al Matrix Composite System Reinforced by Al-Cu-Fe Alloy Particles." Washington, D.C. : Oak Ridge, Tenn. : United States. Dept. of Energy. Office of Science ; distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy, 2004. http://www.osti.gov/servlets/purl/835313-syGDu9/webviewable/.

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Rahi, Khayyun Amtair 1954. "Hydraulic conductivity assessment for a variably-saturated rock matrix." Thesis, The University of Arizona, 1986. http://hdl.handle.net/10150/191883.

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Water flow through unsaturated rock has received increasing attention recently. In order to solve unsaturated flow problems, it is necessary to determine the unsaturated hydraulic conductivity, K. A model which predicts K from water retention data was evaluated for rock matrices. It includes three unknown parameters to be determined from experimental data. To verify the model, K was measured by the outflow method. Water retention data were determined by two methods, the pressure plate extractor and the psychrometer. Near saturation, the water retention curve was best estimated by the pressure extractor method. The outflow method gave reliable measurements of K at low negative pressure heads (≥ -1000 cm of water). The predicted K deviated from the experimental values when only the water retention data were used to estimate the model parameters. When the measured K was incorporated in the parameter estimation process, the deviation was reduced considerably.
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Li, Ju 1975. "Modeling microstructural effects of deformation resistance and thermal conductivity." Thesis, Massachusetts Institute of Technology, 2000. http://hdl.handle.net/1721.1/46283.

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Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Nuclear Engineering, 2000.
Includes bibliographical references (p. 344-360).
This is a study of the microstructural influences on thermo-mechanical behavior of selected metals and ceramics using computer simulation, with original contributions in both theoretical and applied aspects. There are three major thrusts. First, by constructing a many-body empirical potential for ZrCx and then carrying out MD simulations to calculate its lattice thermal conductivity, I obtain the first quantitative evidence ever that the vibrational contribution is only a small part of the total thermal conductivity of refractory carbides at realistic carbon vacancy concentrations. This is a long-standing problem which even the most recent review article on the subject give what I now believe is the wrong estimate. Second, ideal strengths are calculated for Ar,Cu,SiC crystals using both lattice and molecular dynamics methods. A set of homogeneous instability criteria are derived. Tension tests are performed on amorphous and nanocrystalline SiC at room temperature, based on which a grain size cutoff of ~20 nm is extrapolated for the Hall-Petch effect. Nano-indentation is performed on single-crystal and nanocrystalline Cu, and bursts of dislocation loops is observed at a local stress level consistent with recent experiments on Cu thin films. Third, an invariant loop summation similar to the J-integral is derived for the driving force on defect motion, but with the loop size now down to nanometers, and the summation now expressed in terms of interatomic forces instead of stress, a field concept which is hard to use in atomistic calculations and becomes ill-defined when defect separations approach the nanometer scale. It is shown first that the change in a system's total Helmholtz free energy due to a defect's move can be approximated by a local quantity involving only scores of atoms immediately surrounding the defect. Then, perturbation expansion is used to evaluate this local invariant for defect translation using only the current configuration. This driving force measure is then tested on a) self-interstitial diffusion near free surface in [alpha]-iron, b) crack-tip extension near a void in Si, c) screw dislocation translation in Si, with convincing results down to literally r = 1 nm, at a fraction of the cost of a full relaxation or free energy calculation for the whole system. This means that defect mobility can now be characterized by a universal and invariant standard, computable from a tiny atomistic calculation without relying on elasticity formulas or image summations. The standard is then used to determine the true Peierls-Nabarro stress in Si-like materials.
by Ju Li.
Ph.D.
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4

Chinyamakobvu, Oswald Simbarashe. "Metal matrix composites for abrasive wear resistance." Thesis, Imperial College London, 1988. http://hdl.handle.net/10044/1/46998.

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Adhikari, Amit. "Polymer Matrix Composite: Thermally Conductive GreasesPreparation and Characterization." University of Akron / OhioLINK, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=akron1556282222035491.

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Alshabbani, Haydar Swiry Rahi. "Metal matrix composites with diamond for abrasion resistance." Thesis, University of Sheffield, 2018. http://etheses.whiterose.ac.uk/22944/.

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Metal matrix composites (MMCs) have been used in many applications (such as automotive, aerospace and construction) for many decades. Recently, there have been interesting developments in this type of composite, applying them in electronic and thermal applications such as with semiconductors, in electronic packaging and heat sinks. This is particularly the case for composites of a metal matrix with diamond which are considered a modern sub-class of metal matrix composites. However, while the thermal properties are exceptional, this class of composites has not been extensively examined for mechanical and tribological behaviour, and it may be possible to apply these composites in practical applications, especially those that require extreme mechanical and tribological strength, for example cutting resistance for security applications. Therefore, this research looks for a composite material consisting of metal matrix and diamond particles, which resists abrasive cutting. This progresses through a series of steps, developing methods to process the material, understanding the mechanics of abrasive behaviour and optimizing the composite structure to resist abrasive cutting. Gas Infiltration (GI) casting under gas pressure has been applied to metal matrices with relatively low melting point (aluminium (Al) and tin (Sn)) to obtain a significant penetration of the metal into a preform of diamond particles. Different diamond particle sizes (63-75, 212-250, 420-500 μm) were used to strengthen the Al matrix and diamond coated with a thin Ti layer was used to attempt to enhance the bonding forces between the aluminium matrix and diamond. Al-1 wt. % Mg as a matrix alloy was utilised to investigate the possible effect of Mg on bonding phases and to reduce the surface tension of molten aluminium during the infiltration process. Epoxy was also used as a matrix with diamond in this research by gravity infiltration. Tribological and microstructural tests were performed on the samples, and the results show that the surface modification (Ti coating) of diamond particles has an important role for enhancing the bonding between the aluminium matrix and diamond reinforcement as is apparent under SEM observation, thus improving wear resistance. The coating layer works to either catalyse the graphitisation of diamond surfaces to then dissolve carbon in the metal, or reacts at the diamond surfaces to form carbide crystallites at the interface. This may be one of the reasons contributing to the bonding between the different matrices and diamond. The presence of some of these phases was indicated with XRD patterns and Raman spectra. The principal characterization method was by abrasion cutting tests, which have been carried out on all the samples made. One particle size range, 420-500 μm, of diamond coated by Ti, has been used to manufacture composites with different matrices (titanium (Ti), nickel )Ni(, copper)Cu(, tin)Sn) and epoxy) using different production methods (PM and SPS) for the transition metal matrices due to their high melting points. The abrasion cutting tests of these composites showed that the bonding between the metal matrix and diamond reinforcement and the processing temperature, have an important role in enhancing the abrasion wear resistance of composites, rather than the hardness of matrices.
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Lee, Jae-Kon. "Thermal cycling and creep resistance of metal matrix composites /." Thesis, Connect to this title online; UW restricted, 1996. http://hdl.handle.net/1773/7103.

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Park, Joon-Soo. "Evaluation Methods for Fracture Resistance of Ceramic Matrix Composites." Kyoto University, 2003. http://hdl.handle.net/2433/148648.

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Kyoto University (京都大学)
0048
新制・課程博士
博士(エネルギー科学)
甲第10330号
エネ博第66号
新制||エネ||20(附属図書館)
UT51-2003-H751
京都大学大学院エネルギー科学研究科エネルギー応用科学専攻
(主査)教授 香山 晃, 教授 石井 隆次, 教授 落合 庄治郎
学位規則第4条第1項該当
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Rinkevich, A. B., M. I. Samoylovich, and A. F. Belyanin. "Effective Conductivity and Magnetic Permeability of Nanostructured Materials in Magnetic Field." Thesis, Sumy State University, 2013. http://essuir.sumdu.edu.ua/handle/123456789/35340.

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The problem of homogenization the nanostructured materials placed in DC magnetic field has been discussed. The experimental data are obtained using metallic superlattices, metal-dielectric thin films and 3D-nanostructured materials. All these materials contain ferro- or ferrimagnetic component. The trans-mission and reflection coefficients were measured on the waves of millimeter waveband. It has been shown that the experimental frequency spectra of the coefficients in zero magnetic field can be described by the effective conductivity and dielectric permittivity. The spectra of ferromagnetic resonance, however, cannot be calculated correctly with the averaged magnetization. When you are citing the document, use the following link http://essuir.sumdu.edu.ua/handle/123456789/35340
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Mackert, Marc. "Conductivity for schematic conversion : a new conceptualization for resistance to organizational change /." free to MU campus, to others for purchase, 2001. http://wwwlib.umi.com/cr/mo/fullcit?p3025637.

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Books on the topic "Conductivity and resistance matrix"

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Ellis, David L. Thermal conductivity and thermal expansion of graphite fiber/copper matrix composites. [Washington, DC]: National Aeronautics and Space Administration, 1991.

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Özcan, Selçuk. Recovery boiler fireside deposit thermal shock resistance and thermal conductivity. Ottawa: National Library of Canada = Bibliothèque nationale du Canada, 1992.

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Fuks, I. M. Atmospheric electricity features above the oceans and terrain. Boulder, Colo: U.S. Dept. of Commerce, National Oceanic and Atmospheric Administration, Oceanic and Atmospheric Research Laboratories, Environmental Technology Laboratory, 2001.

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Machczyński, Wojciech. Prądy i potencjały wzdłuż obwodów ziemnopowrotnych w zewnętrznym polu elektromagnetycznym (Quasi-stacjonarnym). Poznań: Wydawn. Politechniki Poznańskiej, 1988.

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Verweerd, Arre Job. Performance analysis and characterisation of a new magneto-electrical measurement system for electrical conductivity imaging. Jülich: Forschungszentrum Jülich GmbH, Zentralbibliothek, 2007.

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The path of no resistance: The story of the revolution in super conductivity. New York: Simon and Schuster, 1989.

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Nettles, A. T. A damage resistance comparison between candidate polymer matrix composite feedline materials. Marshall Space Flight Center, Ala: National Aeronautics and Space Administration, Marshall Space Flight Center, 2000.

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Louis, P. Computer simulation of spatial arrangement and connectivity of particles in three-dimensional microstructure: Application to model electrical conductivity of polymer matrix composite. [Washington, DC: National Aeronautics and Space Administration, 1996.

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Fox, Katharine Margaret. Effects of interfacial properties on fatigue crack growth resistance in Ti/SiC metal matrix composites. Birmingham: University of Birmingham, 1994.

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Delano, C. B. Development of an impact- and solvent-resistant thermoplastic composite matrix--phase III. Mountain View, Calif: Acurex Corporation, Aerotherm Division, 1985.

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Book chapters on the topic "Conductivity and resistance matrix"

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Smythe, Richard J. "Resistance and Conductivity." In Arduino Measurements in Science, 369–417. Berkeley, CA: Apress, 2021. http://dx.doi.org/10.1007/978-1-4842-6781-3_7.

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Kotov, Vladimir B., and Galina A. Beskhlebnova. "Generation of the Conductivity Matrix." In Advances in Neural Computation, Machine Learning, and Cognitive Research V, 276–84. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-91581-0_37.

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Klemens, P. G. "Phonon Scattering and Thermal Resistance Due to Spin Disorder." In Thermal Conductivity 20, 261–64. Boston, MA: Springer US, 1989. http://dx.doi.org/10.1007/978-1-4613-0761-7_25.

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Tong, Xingcun Colin. "High Thermal Conductivity Metal Matrix Composites." In Advanced Materials for Thermal Management of Electronic Packaging, 233–76. New York, NY: Springer New York, 2010. http://dx.doi.org/10.1007/978-1-4419-7759-5_6.

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Hasselman, D. P. H. "Thermal Diffusivity and Conductivity of Composites with Interfacial Thermal Contact Resistance." In Thermal Conductivity 20, 405–13. Boston, MA: Springer US, 1989. http://dx.doi.org/10.1007/978-1-4613-0761-7_38.

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Hodkinson, P. S., and Tariq Sethi. "Extracellular Matrix-Mediated Drug Resistance." In Drug Resistance in Cancer Cells, 115–35. New York, NY: Springer US, 2009. http://dx.doi.org/10.1007/978-0-387-89445-4_6.

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Ichard, J. C., R. Pailler, and Jacques Lamon. "Ceramic Matrix Composite with Increased Thermal Conductivity." In Advances in Science and Technology, 1405–10. Stafa: Trans Tech Publications Ltd., 2006. http://dx.doi.org/10.4028/3-908158-01-x.1405.

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Maillet, D., A. Degiovanni, and S. André. "Estimation of a Space-Varying Heat Transfer Coefficient or Interface Resistance by Inverse Conduction." In Thermal Conductivity 23, 72–84. Boca Raton: CRC Press, 2021. http://dx.doi.org/10.1201/9781003210719-10.

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Satter, M., and T. Ashworth. "An Investigation of Thermal Contact Resistance in Thermal Conductivity Measurements of a Thin Nylon Sample." In Thermal Conductivity 18, 641–50. Boston, MA: Springer US, 1985. http://dx.doi.org/10.1007/978-1-4684-4916-7_60.

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Wang, H., and S. H. Jason Lo. "Effect of Heat Treatment on the Thermal Conductivity of a Particulate SiC Reinforced 6061 Aluminum Matrix Composite." In Thermal Conductivity 23, 288–98. Boca Raton: CRC Press, 2021. http://dx.doi.org/10.1201/9781003210719-32.

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Conference papers on the topic "Conductivity and resistance matrix"

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Zhang, Yujuan, Zhuoshen Shen, and Zhensong Tong. "Thermal Conductivity and Interfacial Thermal Barrier Resistance of the Particle Reinforced Metal Matrix Composites." In 2007 8th International Conference on Electronic Packaging Technology. IEEE, 2007. http://dx.doi.org/10.1109/icept.2007.4441445.

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Lehmann, Gary, Hao Zhang, Arun Gowda, and David Esler. "Thermal Resistance of Bond-Lines Formed With Composite Thermal Interface Materials." In ASME 2005 Pacific Rim Technical Conference and Exhibition on Integration and Packaging of MEMS, NEMS, and Electronic Systems collocated with the ASME 2005 Heat Transfer Summer Conference. ASMEDC, 2005. http://dx.doi.org/10.1115/ipack2005-73380.

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Measurements and modeling of the thermal resistance of thin (< 100 microns) bond-lines are reported for composite thermal interface materials (TIMs). The composite TIMs consist of alumina particles dispersed in a polymer matrix to form six different adhesive materials. These model TIMs have a common matrix material and are distinguished by their particle size distributions. Bond-lines are formed in a three-layer assembly consisting of a substrate-TIM-substrate structure. The thermal resistance of the bond-line is measured, as a function of bond-line thickness, using the laser flash-technique. A linear variation of resistance with bond-line thickness is observed; Rbl = β · Lbl + Ro. A model is presented that predicts the effective thermal conductivity of the composite as a function of the particle and matrix conductivity, the particle-matrix surface conductance, the particle volume fraction and the particle size distribution. Specifically a method is introduced to account for a broad, continuous size distribution. A particle-matrix surface conductance value of ∼10W/mm2K is found to give good agreement between the measured and predicted effective thermal conductivity values of the composite TIMs.
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Grandio, Diana, and Drazen Fabris. "Modeling Thermal Conductivity of Aligned CNT-Matrix Composites With Increasing Volume Fraction." In ASME 2016 Heat Transfer Summer Conference collocated with the ASME 2016 Fluids Engineering Division Summer Meeting and the ASME 2016 14th International Conference on Nanochannels, Microchannels, and Minichannels. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/ht2016-7145.

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In prior work an effective medium approach (EMA) has been developed to evaluate composite physical properties such as thermal conductivity, dielectric function or elastic modulus (C.-W. Nan, Prog. Mat. Sci. V. 37, 1993). This model combined with the Kapitza interface resistance can predict the effective thermal conductivity of randomly dispersed long fibers for a very low volume fraction (f < 0.01). The present study compares finite-element (FEA) computations and the EMA model for CNT-matrix compositions with low to moderate volume fractions, 0.001 to 0.02. The FEA results obtained show that the EMA model underestimates the effective thermal conductivity of the composite when the particles are very close to each other, even for small particle volume fractions. For aligned fibers the Kaptiza resistance cannot be neglected in the longitudinal direction. This paper proposes a general correction function for the dependence on particle to particle interaction based on the near neighbor distances and the number of near neighbors. This correction function reduces the EMA under prediction to within several percent (< 5%) in most cases.
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Toprak, Kasim, and Yildiz Bayazitoglu. "Interface Thermal Resistance and Length Effect on Thermal Conductivitiy of SWNT Bundles." In ASME 2012 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/imece2012-89935.

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Using different calculations and measurement methods, the results for the thermal conductivity in a single wall carbon nanotube (SWNT) are compared. Then, the interface thermal resistance effects on the effective thermal conductivity of multiple SWNTs in a hexagonal packing system submerged in oil, air, and water are studied. The results show that as the interface thermal resistance increases, the effective thermal conductivity decreases. Moreover, length, length fraction, and volume fraction effects on the thermal conductivity of the system submerged in a water medium are approximated by including the interface thermal resistances of the nanotube-matrix and nanotube-nanotube. The systems’ length ranged between 500–3000 nm. The created models contain either vertically aligned or non-straight nanotubes. Non-straight nanotubes systems make one or two contact points with other nanotubes. These contact points’ location vary based on the length ratio known as the length fraction. It is found that the effective thermal conductivity of the SWNT bundle has the highest value when they are uniformly aligned and dispersed without contact. As the density and length of the SWNTs increase, the effective thermal conductivity of the bundle system also increases.
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Zhang, Xiuping, Lei Li, Yaozhao Mu, Yanxiang Xie, Jun Dai, and Jing Shi. "Enhancing Conductivity and Corrosion Resistance by Organic Coatings on AZ31 Magnesium Alloy Treated by Micro-Arc Oxidation." In ASME 2019 14th International Manufacturing Science and Engineering Conference. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/msec2019-2894.

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Abstract In this study, an organic coating, in combination of a micro-arc oxidation ceramic layer, was prepared on the surface of a magnesium alloy (AZ31) to achieve both functions of corrosion resistance and electrical conductivity. By using carbon black as conductive particles and epoxy resin as matrix, organic coatings of various weight fractions were applied on the AZ31 surface treated by micro-arc oxidation through adjusting the contents of the conductive particles and non-conductive matrix. Electrical conductivity and corrosion resistance of organic coatings were measured. The results show that the organic coatings can improve the electrical conductivity of the AZ31 material treated by micro-arc oxidation, and the conductivity changes with the ratio between the carbon black particles and non-conductive matrix. The smallest resistance value of the organic coatings reached 130Ω. Also, the organic coating can further improve the corrosion resistance of the AZ31 material. The electrochemical corrosion tests show that the corrosion potential of the AZ31 material with composite coatings was at least 0.6V higher than that of AZ31 only with micro-arc oxidation treatment.
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Xue, Yibin, Frank Abdi, Gregory N. Morscher, and Sung Choi. "Non-Destructive Ceramic Matrix Composite Impact Modeling Validation." In ASME Turbo Expo 2013: Turbine Technical Conference and Exposition. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/gt2013-94728.

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Ceramic matrix composite (CMC) materials technology is of fundamental importance to gas turbine engine application. FOD (foreign Object Damage) in CMC components can result in component localized damage and a loss of post-impact performance. CMC impact generates a varying degree of damage from localized surface damage to complete penetration depending on the severity of impact events. Ceramic Composite equivalent electrical properties are computed based on simplified Multi-scale micromechanics equations. Electrical resistance and/or conductivity are computed utilizing the constituent material properties, effective medium, and percolation theories. Ceramic composite electrical properties simulation requires the algorithm development that combines the effective medium and percolation theories. A physically based percolation model is implemented to characterize the effective electrical conductivity of heterogeneous composites by means of the combination of effective medium (EM) and percolation equations with universal exponents. It is shown that the present model correlates well with the experimental electrical resistivity and acoustic emission data. The change in electrical resistivity after impact is compared with test data of a SA-SiC fiber reinforced SiC matrix composite. The predicted damage after impact and the trend of damage volume correlated well with experimental observations of damage shape and reduction in electrical resistance. Thus, an empirical relationship between damage volume and mechanisms and electrical resistance are developed and presented.
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Bracamonte, Lori, James Withers, and Thomas Smith. "Lightweight, Wear Resistant, High Thermal Conductivity Metal Matrix Composite Brake Rotors." In Brake Colloquium & Exhibition - 36th Annual. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 2018. http://dx.doi.org/10.4271/2018-01-1879.

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Cummings, Antonette T., Li Shi, and Joseph H. Koo. "Thermal Conductivity Measurements of Nylon 11-Carbon Nanofiber Nanocomposites." In ASME 2005 International Mechanical Engineering Congress and Exposition. ASMEDC, 2005. http://dx.doi.org/10.1115/imece2005-81920.

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Nylon 11, a popular material for commercial use, has been combined with low-percent loads of carbon nanofibers (CNFs) to tailor mechanical, fire retardancy, and thermal properties. Transmission electron microscopy images show that the CNFs are randomly aligned in the polymer matrix. We show that the thermal conductivity is minimized at a certain percent loading of CNFs due to a large thermal contact resistance between the CNFs and the medium.
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Jensen, Hans D., and Carsten Thirstrup. "Direct traceability for ultra-pure water conductivity." In NCSL International Workshop & Symposium. NCSL International, 2013. http://dx.doi.org/10.51843/wsproceedings.2013.02.

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Direct traceability for ultra-pure water conductivity. DFM has established a calibration setup with direct SI traceability for conductivity sensors and measurement systems for conductivity of pure to ultra-pure water. Electrolytic conductivity is a widely used parameter for the characterization of purity of water, due to its high sensitivity to ionic content e.g. from contaminants. The Pharmacopoeias (US, EU, etc.) specify (traceable) conductivity measurements as the method for documenting compliance with requirements of Water for Injection (WFI), and other regulations on pure water quality also rely on conductivity as the quality parameter. Conductivity sensors are presently calibrated either using reference materials with conductivity many orders of magnitude different from the level of measurement, and/or in a matrix different (sometimes very different) from pure water. Some users rely on indirect properties such as the temperature coefficient of water as a quality control parameter. DFM has developed a geometrically characterised measurement cell, hence a primary standard, relevant for ultra-low conductivity. Combined with a bulk resistance derived from impedance spectroscopy, also traceable to international standards, it allows direct measurement of low conductivity (less than 20 ìS/cm). A calibration setup with comparison to the primary cell establishes direct traceability to SI, without the need for assumptions on scaling properties of conductivity cells or insignificant matrix effects. The setup has been validated through an international measurement comparison at the NMI level.
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Lingamneni, Srilakshmi, Amy M. Marconnet, and Kenneth E. Goodson. "3D Packaging Materials Based on Graphite Nanoplatelet and Aluminum Nitride Nanocomposites." In ASME 2013 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/imece2013-66419.

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Nanostructured composites with efficient percolation networks are promising candidates for packaging materials due to their high thermal conductivity. In this study, we investigate the thermal conductivity of composites consisting of a combination of exfoliated graphene nanoplatelet (xGNP) and aluminum nitride (AlN) particles in polyvinylidine fluoride (PVDF) matrix. The surfaces of the AlN particles are treated with silane to reduce the interfacial thermal resistance at particle-matrix boundary. Samples with 50 vol% AlN and 2 vol% xGNP showed an order of magnitude enhancement in thermal conductivity. AlN composites (with and with out xGNP) showed evidence of effective percolation pathways for AlN vol % over ∼40.
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Reports on the topic "Conductivity and resistance matrix"

1

Evans, John S. Biomolecular Principles of Matrix Assembly Related to Fracture Resistance. Fort Belvoir, VA: Defense Technical Information Center, June 2013. http://dx.doi.org/10.21236/ada600953.

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R.G. Quinn. Thermal Diffusivity and Conductivity in Ceramic Matrix Fiber Composite Materials - Literature Study. Office of Scientific and Technical Information (OSTI), May 2000. http://dx.doi.org/10.2172/821297.

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Steif, P. S. Theoretical models for the ultimate strength and flaw resistance of unidirectionally-reinforced ceramic-matrix composites. Office of Scientific and Technical Information (OSTI), January 1992. http://dx.doi.org/10.2172/6972663.

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Bockstaller, Michael. Novel Transparent Phosphor Conversion Matrix with High Thermal Conductivity for Next Generation Phosphor-Converted LED-based Solid State Lighting. Office of Scientific and Technical Information (OSTI), February 2017. http://dx.doi.org/10.2172/1342512.

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Speyer, Robert F. Oxidation Resistance, Electrical and Thermal Conductivity, and Spectral Emittance of Fully Dense HfB2 and ZrB2 with SiC, TaSi2, and LaB6 Additives. Fort Belvoir, VA: Defense Technical Information Center, January 2012. http://dx.doi.org/10.21236/ada563908.

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Steif, P. S. Theoretical models for the ultimate strength and flaw resistance of unidirectionally-reinforced ceramic-matrix composites. Progress report, September 1989--August 1992. Office of Scientific and Technical Information (OSTI), December 1992. http://dx.doi.org/10.2172/10107817.

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7

Luc, Brunet. Systematic Equations Handbook : Book 1-Energy. R&D Médiation, May 2015. http://dx.doi.org/10.17601/rd_mediation2015:1.

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The energy equation handbook is the complete collection of physically coherent expression of energy computed using from 2 to 7 physical units among: density(ML-3) energy (ML2T-2) time (T) force (MLT-2) power (ML2T-3) current (I) temperature (Th) quantity (N) mass (M) length (L) candela (J) surface (L2) volume (L3) concentration (ML-3) frequency (T-1) acceleration (LT- 2) speed (LT-1) pressure (ML-1T-2) viscosity (ML-1T-1) luminance (L- 2J) MolarMass (MN-1) MassicEnergy (L2T-2) resistance (ML2T-3I-2) voltage (ML2T-3I-1) Farad (M-1L-2T4I2) Thermal- Conductivity (MLT-3Th-1) SpecificHeat (L2T-2Th-1) MassFlux (MT-1) SurfaceTension (MT-2) Charge (TI) Resistivity (ML3T-3I-2) The complete list of 4196 equations is sorted by number of variable required to obtain an energy in Joules. All the units are in MKSA.
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Barnes, Eftihia, Jennifer Jefcoat, Erik Alberts, Hannah Peel, L. Mimum, J, Buchanan, Xin Guan, et al. Synthesis and characterization of biological nanomaterial/poly(vinylidene fluoride) composites. Engineer Research and Development Center (U.S.), September 2021. http://dx.doi.org/10.21079/11681/42132.

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The properties of composite materials are strongly influenced by both the physical and chemical properties of their individual constituents, as well as the interactions between them. For nanocomposites, the incorporation of nano-sized dopants inside a host material matrix can lead to significant improvements in mechanical strength, toughness, thermal or electrical conductivity, etc. In this work, the effect of cellulose nanofibrils on the structure and mechanical properties of cellulose nanofibril poly(vinylidene fluoride) (PVDF) composite films was investigated. Cellulose is one of the most abundant organic polymers with superior mechanical properties and readily functionalized surfaces. Under the current processing conditions, cellulose nanofibrils, as-received and 2,2,6,6-tetramethylpiperidine-1-oxyl radical (TEMPO) oxidized, alter the crystallinity and mechanical properties of the composite films while not inducing a crystalline phase transformation on the 𝛾 phase PVDF composites. Composite films obtained from hydrated cellulose nanofibrils remain in a majority 𝛾 phase, but also exhibit a small, yet detectable fraction of 𝛼 and ß PVDF phases.
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Chandler, Jackie, Mike Clarke, and Julian Higgins, eds. Cochrane Methods 2012. Wiley, September 2012. http://dx.doi.org/10.1002/14651858.cd201201.

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10

Fluhr, Robert, and Maor Bar-Peled. Novel Lectin Controls Wound-responses in Arabidopsis. United States Department of Agriculture, January 2012. http://dx.doi.org/10.32747/2012.7697123.bard.

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Innate immune responses in animals and plants involve receptors that recognize microbe-associated molecules. In plants, one set of this defense system is characterized by large families of TIR–nucleotide binding site–leucine-rich repeat (TIR-NBS-LRR) resistance genes. The direct interaction between plant proteins harboring the TIR domain with proteins that transmit and facilitate a signaling pathway has yet to be shown. The Arabidopsis genome encodes TIR-domain containing genes that lack NBS and LRR whose functions are unknown. Here we investigated the functional role of such protein, TLW1 (TIR LECTIN WOUNDRESPONSIVE1). The TLW1 gene encodes a protein with two domains: a TIR domain linked to a lectin-containing domain. Our specific aim in this proposal was to examine the ramifications of the TL1-glycan interaction by; A) The functional characterization of TL1 activity in the context of plant wound response and B) Examine the hypothesis that wounding induced specific polysaccharides and examine them as candidates for TL-1 interactive glycan compounds. The Weizmann group showed TLW1 transcripts are rapidly induced by wounding in a JA-independent pathway and T-DNA-tagged tlw1 mutants that lack TLW1 transcripts, fail to initiate the full systemic wound response. Transcriptome methodology analysis was set up and transcriptome analyses indicates a two-fold reduced level of JA-responsive but not JA-independent transcripts. The TIR domain of TLW1 was found to interact directly with the KAT2/PED1 gene product responsible for the final b-oxidation steps in peroxisomal-basedJA biosynthesis. To identify potential binding target(s) of TL1 in plant wound response, the CCRC group first expressed recombinant TL1 in bacterial cells and optimized conditions for the protein expression. TL1 was most highly expressed in ArcticExpress cell line. Different types of extraction buffers and extraction methods were used to prepare plant extracts for TL1 binding assay. Optimized condition for glycan labeling was determined, and 2-aminobenzamide was used to label plant extracts. Sensitivity of MALDI and LC-MS using standard glycans. THAP (2,4,6- Trihydroxyacetophenone) showed minimal background peaks at positive mode of MALDI, however, it was insensitive with a minimum detection level of 100 ng. Using LC-MS, sensitivity was highly increased enough to detect 30 pmol concentration. However, patterns of total glycans displayed no significant difference between different extraction conditions when samples were separated with Dionex ICS-2000 ion chromatography system. Transgenic plants over-expressing lectin domains were generated to obtain active lectin domain in plant cells. Insertion of the overexpression construct into the plant genome was confirmed by antibiotic selection and genomic DNA PCR. However, RT-PCR analysis was not able to detect increased level of the transcripts. Binding ability of azelaic acid to recombinant TL1. Azelaic acid was detected in GST-TL1 elution fraction, however, DHB matrix has the same mass in background signals, which needs to be further tested on other matrices. The major findings showed the importance of TLW1 in regulating wound response. The findings demonstrate completely novel and unexpected TIR domain interactions and reveal a control nexus and mechanism that contributes to the propagation of wound responses in Arabidopsis. The implications are to our understanding of the function of TIR domains and to the notion that early molecular events occur systemically within minutes of a plant sustaining a wound. A WEB site (http://genome.weizmann.ac.il/hormonometer/) was set up that enables scientists to interact with a collated plant hormone database.
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