Letteratura scientifica selezionata sul tema "Conductance"

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Articoli di riviste sul tema "Conductance"

1

Senior, A., M. J. Kosch e F. Honary. "Comparison of methods to determine auroral ionospheric conductances using ground-based optical and riometer data". Annales Geophysicae 26, n. 12 (2 dicembre 2008): 3831–40. http://dx.doi.org/10.5194/angeo-26-3831-2008.

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Abstract. Ground-based images of auroral optical emissions and cosmic radio noise absorption provide information on particle precipitation which enhances ionospheric conductances. Knowledge of this conductance field is important to understand the current systems associated with auroral features. Three methods of using ground-based optical and riometer data to estimate ionospheric conductances in the aurora are compared to conductances derived from incoherent scatter radar measurements. It is shown that a method using the 557.7 nm emission intensity alone gives the best results for the Pedersen conductance whilst a method using both this intensity and cosmic noise absorption is best for the Hall conductance. A method using cosmic noise absorption alone gives reasonable performance for the Hall conductance and the Hall/Pedersen conductance ratio, but performs poorly for the Pedersen conductance. It also appears to underestimate the Hall conductance significantly during times when softer precipitation is present, for example in discrete auroral arcs. There is some indication that the methods do not degrade noticeably for angles up to ~20° off magnetic zenith.
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Butt, A. G., W. L. Clapp e R. A. Frizzell. "Potassium conductances in tracheal epithelium activated by secretion and cell swelling". American Journal of Physiology-Cell Physiology 258, n. 4 (1 aprile 1990): C630—C638. http://dx.doi.org/10.1152/ajpcell.1990.258.4.c630.

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Increased basolateral membrane K conductance accompanies stimulation of Cl secretion across canine trachea. To assess the K conductance properties, we permeabilized the apical membranes with amphotericin B and monitored the current and conductance caused by K flow across the basolateral membranes. Under basal unstimulated conditions, two K conductances could be distinguished by blockers. One was inhibited only by barium; the other was sensitive also to quinidine and lidocaine. The permeabilities of the basal conductance pathways to K and Rb were similar (PK/PRb approximately equal to 1.5). The secretory agonist, epinephrine, selectively increased the quinidine-insensitive conductance, implicating it in the Cl secretory response. Cell swelling induced a third conductance with a low permeability to Rb (PK/PRb approximately equal to 10) that was quinidine sensitive. In tissues not treated with amphotericin, neither quinidine nor Rb-for-K replacement inhibited transepithelial Cl secretion. Thus neither of the quinidine-sensitive K conductances (basal or swelling induced) contribute to the increase in basolateral K conductance during Cl secretion. Cell shrinkage inhibited all three conductances and secretion, suggesting that the initial priority of the cell is volume regulation.
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Yoshii, K., L. E. Moore e B. N. Christensen. "Effect of subthreshold voltage-dependent conductances on the transfer function of branched excitable cells and the conduction of synaptic potentials". Journal of Neurophysiology 59, n. 3 (1 marzo 1988): 706–16. http://dx.doi.org/10.1152/jn.1988.59.3.706.

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1. Impulse response functions were determined from complex point impedance and transfer functions from cultured NG-108 cells to simulate the propagation of a synaptic potential in response to the release of transmitter. In general, the flow of synaptic current has a much shorter duration than the normal membrane time constant, thereby making the use of impulse response functions useful approximations to synaptic events. 2. The resonance observed during the activation of the potassium conductance was reflected in the impulse response function as a pronounced damped oscillation. A comparison of the impulse response functions calculated from point impedance and transfer functions showed similar results for current injections in the growth cone. 3. In addition to the resonance effects of the voltage-dependent conductances on transfer and impulse response functions due principally to the activation of conductances for outward currents, transfer functions were measured during the activation of a steady-state negative conductance. Under these conditions the phase function approaches 180 degrees, indicating that the voltage response is out of phase with the current. 4. In the steady state, the effect of a negative conductance is to algebraically add to the positive conductances and generally decrease the absolute conductance unless there is a net negative current. The decreased conductance enhances the impulse response and the DC space constant, thus leading to a better propagation of slow potentials. This effect can be seen as a decrease in the electrotonic length, L, with intermediate depolarizations. At large depolarizations the steady-state activation of the K conductance generally dominates and leads to a greatly increased electrotonic length. 5. Both the net conductances and the associated kinetics play a role in shaping the potential changes during a synaptic current. This is especially critical if there is a net negative steady-state conductance. Under these conditions there is a surprising reduction in the impulse response function. 6. Thus, during a subthreshold activation of the voltage-dependent negative conductances, the observable synaptic potentials would be either large potential responses due to an apparent increase in the impedance (algebraic summation of positive and negative conductances with a net positive conductance) or a minimal response because of the phasic cancellation due to a net negative conductance. The latter condition could exist near the synaptic reversal potential due to a large synaptic drive and would appear experimentally as a form of inhibition.(ABSTRACT TRUNCATED AT 400 WORDS)
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Monje, Oscar, e Bruce Bugbee. "Radiometric Method for Determining Canopy Stomatal Conductance in Controlled Environments". Agronomy 9, n. 3 (27 febbraio 2019): 114. http://dx.doi.org/10.3390/agronomy9030114.

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Canopy stomatal conductance is a key physiological factor controlling transpiration from plant canopies, but it is extremely difficult to determine in field environments. The objective of this study was to develop a radiometric method for calculating canopy stomatal conductance for two plant species—wheat and soybean from direct measurements of bulk surface conductance to water vapor and the canopy aerodynamic conductance in controlled-environment chambers. The chamber provides constant net radiation, temperature, humidity, and ventilation rate to the plant canopy. In this method, stepwise changes in chamber CO2 alter canopy temperature, latent heat, and sensible heat fluxes simultaneously. Sensible heat and the radiometric canopy-to-air temperature difference are computed from direct measurements of net radiation, canopy transpiration, photosynthesis, radiometric temperature, and air temperature. The canopy aerodynamic conductance to the transfer of water vapor is then determined from a plot of sensible heat versus radiometric canopy-to-air temperature difference. Finally, canopy stomatal conductance is calculated from canopy surface and aerodynamic conductances. The canopy aerodynamic conductance was 5.5 mol m−2 s−1 in wheat and 2.5 mol m−2 s−1 in soybean canopies. At 400 umol mol−1 of CO2 and 86 kPa atmospheric pressure, canopy stomatal conductances were 2.1 mol m−2 s−1 for wheat and 1.1 mol m−2 s−1 for soybean, comparable to canopy stomatal conductances reported in field studies. This method measures canopy aerodynamic conductance in controlled-environment chambers where the log-wind profile approximation does not apply and provides an improved technique for measuring canopy-level responses of canopy stomatal conductance and the decoupling coefficient. The method was used to determine the response of canopy stomatal conductance to increased CO2 concentration and to determine the sensitivity of canopy transpiration to changes in canopy stomatal conductance. These responses are useful for improving the prediction of ecosystem-level water fluxes in response to climatic variables.
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Apelblat, Alexander, e Josef Barthel. "Conductance Studies of Aqueous Succinic Acid". Zeitschrift für Naturforschung A 47, n. 3 (1 marzo 1992): 493–98. http://dx.doi.org/10.1515/zna-1992-0309.

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Abstract Conductance measurements of aqueous solutions of succinic acid and of di-sodium succinate were performed from 278.15 to 308.15 K and the limiting conductances λ0 (1/2 Succ2- ) are reported. The Waiden product is independent of temperature: λ0(1/2 Succ2-)*η(T) = 0.503 ± 0.001. The salt conductances closely obey the Onsager limiting law. The evaluation of the equilibrium constants for the primary and secondary steps of dissociation, K1 and K2, and the limiting conductances of the hydrosuccinate ion, λ0(HSucc-), are discussed using the Quint and Viallard conductance equation
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Carter, Gregory A., e Alan H. Teramura. "Nonsummer stomatal conductance for the invasive vines kudzu and Japanese honeysuckle". Canadian Journal of Botany 66, n. 12 (1 dicembre 1988): 2392–95. http://dx.doi.org/10.1139/b88-325.

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A field study was conducted in Maryland to estimate nonsummer stomatal conductances on clear days for two invasive woody vine species common to the southeastern United States. Before the first frost in late October, stomatal conductances were similar for kudzu (Pueraria lobata) and Japanese honeysuckle (Lonicera japonica). When minimum predawn air temperature fell to −0.6 °C, kudzu leaves were irreversibly damaged, whereas maximum daily conductance in honeysuckle was unaffected. Maximum conductances in honeysuckle increased to 14 mm s−1 in late November and mid-December, similar to late-spring and summer values. When minimum air temperatures decreased to −2.8 °C in January, conductance still remained above 5 mm s−1. Maximum daily conductance was lowest in early March, corresponding with low leaf temperatures. By mid-April, maximum conductance increased to 10 mm s−1. Conductances suggested that rates of leaf gas exchange in honeysuckle during fall, winter, and spring were relatively high. Carbon gain during this period might thus contribute substantially to the invasive growth characteristic of the species.
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Munger, Philip H., James M. Chandler e J. Tom Cothren. "Effect of Water Stress on Photosynthetic Parameters of Soybean (Glycine max) and Velvetleaf (Abutilon theophrasti)". Weed Science 35, n. 1 (gennaio 1987): 15–21. http://dx.doi.org/10.1017/s0043174500026722.

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Greenhouse experiments were conducted to elucidate the effects of water stress on photosynthetic parameters of soybean [Glycine max(L.) Merr. ‘Hutton′] and velvetleaf (Abutilon theophrastiMedik. # ABUTH). Stomatal conductance of both species responded curvilinearly to reductions in leaf water potential. At leaf water potentials less negative than −2.5 MPa, stomatal conductance, net photosynthetic rate, and transpiration rate were greater in velvetleaf than in soybean. Soybean photosynthetic rate was linearly related to stomatal conductance. Velvetleaf photosynthetic rate increased linearly with stomatal conductances up to 1.5 cm s–1; however, no increase in photosynthetic rate was observed at stomatal conductances greater than 1.5 cm s–1, indicating nonstomatal limitations to photosynthesis. As water stress intensified, stomatal conductance, photosynthetic rate, and transpiration of velvetleaf declined more rapidly than in soybean.
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Skryma, R., N. Prevarskaya, P. Vacher e B. Dufy. "Voltage-dependent ionic conductances in Chinese hamster ovary cells". American Journal of Physiology-Cell Physiology 267, n. 2 (1 agosto 1994): C544—C553. http://dx.doi.org/10.1152/ajpcell.1994.267.2.c544.

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Chinese hamster ovary (CHO) cells are becoming a widely used biological material. A number of studies report membrane ion conductance changes after transfection of channels and receptors, but there are few data available on the properties of membrane ion conductances of CHO cells before transfection. In this work we studied voltage-dependent ionic conductances in cultures of CHO native (CHO-K1) cells. Three types of voltage-dependent ionic conductances were identified: 1) a K+ conductance showing sensitivity to Ca2+ and a unit conductance of approximately 210 pS in symmetrical 150 mM K+ outside-out patches (this conductance, which did not inactivate during a 160-ms pulse, was inhibited by 30 nM charybdotoxin but not by 30 mM extracellular tetraethylammonium); 2) a rapidly activating and inactivating tetrodotoxin (TTX)-sensitive inward current, peaking at about -10 to 0 mV (this current showed characteristics similar in many respects to Na+ current recorded in neurons); and 3) another voltage-dependent inward current, which had slow inactivation, was TTX insensitive but was blocked by Co2+ (current was also carried by Ba2+, peaked at approximately 0 to +10 mV, was identified as a Ca2+ conductance, and was inhibited by dihydropyridines but not by 10 microM omega-conotoxin). Cell-attached patch recordings of single Ca2+ channel currents demonstrated a unitary conductance of approximately 20 pS.
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Pospischil, Martin, Zuzanna Piwkowska, Michelle Rudolph, Thierry Bal e Alain Destexhe. "Calculating Event-Triggered Average Synaptic Conductances From the Membrane Potential". Journal of Neurophysiology 97, n. 3 (marzo 2007): 2544–52. http://dx.doi.org/10.1152/jn.01000.2006.

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The optimal patterns of synaptic conductances for spike generation in central neurons is a subject of considerable interest. Ideally such conductance time courses should be extracted from membrane potential ( Vm) activity, but this is difficult because the nonlinear contribution of conductances to the Vm renders their estimation from the membrane equation extremely sensitive. We outline here a solution to this problem based on a discretization of the time axis. This procedure can extract the time course of excitatory and inhibitory conductances solely from the analysis of Vm activity. We test this method by calculating spike-triggered averages of synaptic conductances using numerical simulations of the integrate-and-fire model subject to colored conductance noise. The procedure was also tested successfully in biological cortical neurons using conductance noise injected with dynamic clamp. This method should allow the extraction of synaptic conductances from Vm recordings in vivo.
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Palmer, Lawrence G., e Gustavo Frindt. "Cl− channels of the distal nephron". American Journal of Physiology-Renal Physiology 291, n. 6 (dicembre 2006): F1157—F1168. http://dx.doi.org/10.1152/ajprenal.00496.2005.

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Cl− currents were observed under whole cell clamp conditions in cells of the rat cortical collecting duct (CCD), connecting tubule (CNT), and thick ascending limb of Henle's loop (TALH). These currents were much larger in intercalated cells compared with principal cells of the CCD and were also larger in the TALH and in the CNT compared with the CCD. The conductance had no strong voltage dependence, and steady-state currents were similar in inward and outward directions with similar Cl− concentrations on both sides of the membrane. Current transients were observed, particularly at low Cl− concentrations, which could be explained by solute depletion and concentration in fluid layers next to the membrane. The currents had a remarkable selectivity among anions. Among halides, Br− and F− conductances were only 15% of that of Cl−, and I− conductance was immeasurably small. SCN− and OCN− conductances were ∼50%, and aspartate, glutamate, and methanesulfonate conductance was ∼5% that of Cl−. No conductance could be measured for any other anion tested, including NO3−, HCO3−, formate, acetate, or isethionate; NO3− and I− appeared to block the channels weakly. Conductances were diminished by lowering the extracellular pH to 6.4. The properties of the conductance fit best with those of the cloned renal anion channel ClC-K2 and likely reflect the basolateral Cl− conductances of the cells of these nephron segments.
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Tesi sul tema "Conductance"

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Zhu, Ningjia. "Conductance fluctuations in nanostructures". Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp02/NQ30431.pdf.

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Donnermeyer, Achim. "Scanning ion-conductance microscopy". [S.l.] : [s.n.], 2007. http://nbn-resolving.de/urn/resolver.pl?urn=urn:nbn:de:hbz:361-11593.

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Zhu, Ningjia. "Conductance fluctuations in nanostructures". Thesis, McGill University, 1996. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=34492.

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In this Ph.D thesis the conductance fluctuations of different physical origins in semi-conductor nanostructures were studied using both diagrammatic analytical methods and large scale numerical techniques. In the "mixed" transport regime where both mesoscopic and ballistic features play a role, for the first time I have analytically calculated the non-universal conductance fluctuations. This mixed regime is reached when impurities are distributed near the walls of a quantum wire, leaving the center region ballistic. I have discovered that the existence of a ballistic region destroys the universal conductance fluctuations. The crossover behavior of the fluctuation amplitude from the usual quasi-1D situation to that of the mixed regime is clearly revealed, and the role of various length scales are identified. My analytical predictions were confirmed by a direct numerical simulation by evaluating the Landauer formula. In another direction, I have made several studies of conductance or resistance oscillations and fluctuations in systems with artificial impurities in the ballistic regime. My calculation gave explanations of all the experimental results concerning the classical focusing peaks of the resistance versus magnetic field, the weak localization peak in a Sinai billiard system, the formation of a chaotic billiard, and predicted certain transport features which were indeed found experimentally. I have further extended the calculation to study the Hall resistance in a four-terminal quantum dot in which there is an antidot array. From my numerical data I analyzed the classical paths of electron motion and its quantum oscillations. The results compare well with recent experimental studies on similar systems. Since these billiard systems could provide quantum chaotic dynamics, I have made a detailed study of the consequence of such dynamics. In particular I have investigated the resonant transmission of electrons in these chaotic systems, and found that the level-s
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鄭蔚 e Wei Zheng. "Dynamic conductance of nanostructures". Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2002. http://hub.hku.hk/bib/B31243939.

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Fulford, D. J. "Variable conductance heat pipes". Thesis, University of Reading, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.234584.

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Zheng, Wei. "Dynamic conductance of nanostructures /". Hong Kong : University of Hong Kong, 2002. http://sunzi.lib.hku.hk/hkuto/record.jsp?B24367382.

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Ayers, George Harold. "Cylindrical thermal contact conductance". Thesis, Texas A&M University, 2003. http://hdl.handle.net/1969/88.

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Page, Ashley M. "Multifunctional scanning ion conductance microscopy". Thesis, University of Warwick, 2017. http://wrap.warwick.ac.uk/99668/.

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Scanning ion conductance microscopy (SICM) is a nanopipette-based technique that has historically been used for the topographical imaging of soft samples. This thesis demonstrates the development of SICM into a multifunctional tool, capable of providing a host of additional information about both biological and inert samples, whilst maintaining the structural mapping capability for which it is usually employed. Two approaches are taken to extend the functionality of SICM: (i) designing sophisticated potential, and positional, control functions that are then used with traditional single-channel nanopipettes; and (ii) incorporating an ion conductance channel into a multi-barrelled probe. In the single-channel setup, a pulsed-potential profile allows the extraction of surface charge density on extended substrates, and a ramped-potential profile permits spatially resolved mapping of redox reactions on an electrode substrate. When integrated into a more complex probe, SICM is used to study molecular uptake at cellular surfaces, and to print Cu microstructures on a Au substrate. While this thesis is primarily concerned with technique development, the studies herein have broad applications in cell biology, pharmaceuticals, materials science and beyond. In addition to developing imaging modes that allow the extraction of functional information at a surface, this thesis also contributes to the fundamental understanding of the SICM system. Finite element method simulations are performed alongside experimental studies, in order to fully understand the contributions of the pipette geometry, ion current rectification, and pipette-surface interactions on the measured ionic current. The theoretical treatment herein provides a foundation upon which future multifunctional SICM regimes could be designed, extending the scope of this increasingly powerful technique.
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Fox, Colin. "Conductance imaging : estimation of isotropic conductance perturbations from low-frequency boundary measurements in circular geometries". Thesis, University of Cambridge, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.303010.

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Göppert, Georg. "Single electron tunneling at large conductance". [S.l. : s.n.], 2000. http://deposit.ddb.de/cgi-bin/dokserv?idn=960943420.

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Libri sul tema "Conductance"

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Madhusudana, C. V. Thermal contact conductance. New York: Springer-Verlag, 1996.

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Madhusudana, C. V. Thermal Contact Conductance. New York, NY: Springer New York, 1996. http://dx.doi.org/10.1007/978-1-4612-3978-9.

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Madhusudana, Chakravarti V. Thermal Contact Conductance. Cham: Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-01276-6.

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Salerno, Louis J. Thermal contact conductance. Moffett Field, Calif: National Aeronautics and Space Administration, Ames Research Center, 1997.

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Schäffer, Tilman E., a cura di. Scanning Ion Conductance Microscopy. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-031-14443-1.

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Kirk, Kevin L. The cystic fibrosis transmembrane conductance regulator. Georgetown, Tex: Landes Bioscience / Eurekah.com, 2003.

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Dell, Emma Jane. Single Molecule Conductance of Oligothiophene Derivatives. [New York, N.Y.?]: [publisher not identified], 2015.

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Kirk, Kevin L. The cystic fibrosis transmembrane conductance regulator. Georgetown, TX: Landes Bioscience : Eurekah.com, 2004.

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Moyer, R. G. Reduction of pressure-tube/calandria-tube contact conductance. Pinawa, Man: Whiteshell Laboratories, 1992.

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Force and Conductance Spectroscopy of Single Molecule Junctions. [New York, N.Y.?]: [publisher not identified], 2012.

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Capitoli di libri sul tema "Conductance"

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Gooch, Jan W. "Conductance". In Encyclopedic Dictionary of Polymers, 165. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-6247-8_2810.

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Behrends, Ehrhard. "Conductance". In Introduction to Markov Chains, 91–101. Wiesbaden: Vieweg+Teubner Verlag, 2000. http://dx.doi.org/10.1007/978-3-322-90157-6_11.

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Rieger, Philip H. "Electrolytic Conductance". In Electrochemistry, 109–50. Dordrecht: Springer Netherlands, 1994. http://dx.doi.org/10.1007/978-94-011-0691-7_3.

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Magnus, Wim, e Wim Schoenmaker. "Conductance Quantization". In Springer Series in Solid-State Sciences, 225–44. Berlin, Heidelberg: Springer Berlin Heidelberg, 2002. http://dx.doi.org/10.1007/978-3-642-56133-7_16.

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Gooch, Jan W. "Specific Conductance". In Encyclopedic Dictionary of Polymers, 684. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-6247-8_10941.

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Gooch, Jan W. "Surface Conductance". In Encyclopedic Dictionary of Polymers, 716. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-6247-8_11435.

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Peroulis, Dimitrios, Prashant R. Waghmare, Sushanta K. Mitra, Supone Manakasettharn, J. Ashley Taylor, Tom N. Krupenkin, Wenguang Zhu et al. "Conductance Injection". In Encyclopedia of Nanotechnology, 493. Dordrecht: Springer Netherlands, 2012. http://dx.doi.org/10.1007/978-90-481-9751-4_100159.

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Pala, Nezih, Ahmad Nabil Abbas, Carsten Rockstuhl, Christoph Menzel, Stefan Mühlig, Falk Lederer, Joseph J. Brown et al. "Thermal Conductance". In Encyclopedia of Nanotechnology, 2704. Dordrecht: Springer Netherlands, 2012. http://dx.doi.org/10.1007/978-90-481-9751-4_100831.

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Gooch, Jan W. "Overall Conductance". In Encyclopedic Dictionary of Polymers, 509. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-6247-8_8289.

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Gooch, Jan W. "Equivalent Conductance". In Encyclopedic Dictionary of Polymers, 273. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-6247-8_4489.

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Atti di convegni sul tema "Conductance"

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Huang, Zhen, Jayathi Murthy e Timothy S. Fisher. "Thermal Conductance and Constriction Resistance of Single-Layer Graphene Nano Ribbons". In 2010 14th International Heat Transfer Conference. ASMEDC, 2010. http://dx.doi.org/10.1115/ihtc14-23088.

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This paper considers phonon transport behavior in graphene nanoribbons (GNRs) that bridge semi-infinite graphene contacts. The work employs an atomistic Green’s function method to investigate phonon wave effects in zigzag and armchair edge ribbons. Phonon transmission functions and thermal conductances are found to be sensitive to the edge shape of structures. The thermal conductances of GNRs with different widths are normalized by the quantum of thermal conductance to reveal the relation between number of phonon modes and conductance as a function of temperature. In addition, the phonon transmission functions of nano ribbons with defects are evaluated by artificially creating mismatches at interfaces. By comparing the transmission function of different defect patterns and the corresponding thermal conductances, the reduction of phonon transport is quantified. The length of defects is found to be important to phonon transport. Constriction effects are also studied at abrupt mismatched interfaces, and the reduction of thermal conductance is found to be moderately high.
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Cohen, Morrel H., e Adrianus M. M. Pruisken. "The effect of mesoscopic conductance fluctuations on macroscopic conductances". In Ordering disorder: Prospect and retrospect in condensed matter physics. AIP, 1992. http://dx.doi.org/10.1063/1.44721.

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Cividjian, Grigore A. "Deep slot constriction conductance". In 2012 International Conference on Applied and Theoretical Electricity (ICATE). IEEE, 2012. http://dx.doi.org/10.1109/icate.2012.6403390.

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Kastner, Raphael. "High electromagnetic conductance media". In 2013 IEEE International Symposium on Antennas and Propagation & USNC/URSI National Radio Science Meeting. IEEE, 2013. http://dx.doi.org/10.1109/aps.2013.6711235.

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Peña, Abe, A. A. Chabanov, N. Cherroret e S. E. Skipetrov. "Nonuniversal Dynamic Conductance Fluctuations". In Frontiers in Optics. Washington, D.C.: OSA, 2009. http://dx.doi.org/10.1364/fio.2009.fmc5.

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Murashov, Mikhail V., e Sergey D. Panin. "Modeling of Thermal Contact Conductance". In 2010 14th International Heat Transfer Conference. ASMEDC, 2010. http://dx.doi.org/10.1115/ihtc14-22616.

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Abstract (sommario):
Nowadays a new science direction has arisen from decades of experimental work carried out in 20th century — micromechanics of contact processes (deformation, heat transfer, electric conduction). To determine contact area a dynamic elastic-plastic deformation problem is to be solved even in the simplest case — butt contact of two rough surfaces under pressure. It is followed by the solution of spatial boundary heat transfer problem to obtain nonstationary temperature distribution for two bodies. In principal, this stage is not difficult to perform with finite element program ANSYS. Meanwhile the questions concerning deformation and conduction through oxide films of metals as well as directional effect remain. In the literature there are attempts to simulate thermal contact conductance numerically of such authors as M.K.Thompson, S.Lee et al, M. Ciavarella, M.M.Yovanovich and others. The disadvantages of existing spatial models are: - surfaces profiles has no random component; - only elastic or only plastic material behavior; - microroughness is not considered. In the present work the roughness before contact of two rough surfaces of copper bodies was presented as spatial two-level (roughness and microroughness) model with the use of fractal Weierstrass–Mandelbrot function. In quasistatic approach the 3D deformation and heat transfer problems of contacting bodies under pressure were solved within elastic-plastic material behavior. Contact ANSYS elements were used. Copper compression diagram was replaced by multilinear model of isotropic hardening. From the cycle of calculations real contact areas, shapes of contact spots, temperature and stress distributions were determined for the range of pressures. Good agreement with experimental data took place only when microroughness is considered.
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7

Svistunov, Vladimir M., A. I. Khachaturov e M. A. Belogolovskii. "Tunneling conductance of metaloxide junctions". In Photonics West '96, a cura di Ivan Bozovic e Dirk van der Marel. SPIE, 1996. http://dx.doi.org/10.1117/12.241800.

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8

Chierichetti, Flavio, Silvio Lattanzi e Alessandro Panconesi. "Rumour spreading and graph conductance". In Proceedings of the Twenty-First Annual ACM-SIAM Symposium on Discrete Algorithms. Philadelphia, PA: Society for Industrial and Applied Mathematics, 2010. http://dx.doi.org/10.1137/1.9781611973075.135.

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9

Boltar, K. O., L. A. Bovina, L. D. Saginov, V. N. Soliakov e Vitaly I. Stafeev. "Negative conductance in HgCdTe photodiodes". In International Conference on Photoelectronics and Night Vision Devices, a cura di Anatoly M. Filachev. SPIE, 1999. http://dx.doi.org/10.1117/12.350914.

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10

Kamatagi, M. D., R. G. Vaidya, N. S. Sankeshwar, B. G. Mulimani, Alka B. Garg, R. Mittal e R. Mukhopadhyay. "Electronic Thermal Conductance of Graphene". In SOLID STATE PHYSICS, PROCEEDINGS OF THE 55TH DAE SOLID STATE PHYSICS SYMPOSIUM 2010. AIP, 2011. http://dx.doi.org/10.1063/1.3606179.

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Rapporti di organizzazioni sul tema "Conductance"

1

Henderson, Kevin C. Thermal Contact Conductance Modeling. Office of Scientific and Technical Information (OSTI), aprile 2018. http://dx.doi.org/10.2172/1434448.

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2

Swanson, Randy R. Adapting Conductance Technology for Military Application. Fort Belvoir, VA: Defense Technical Information Center, giugno 2005. http://dx.doi.org/10.21236/ada435425.

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3

LeBrun, Thomas, e Kyle Brindley. TRUST Contact Thermal Conductance (CTC) Report. Office of Scientific and Technical Information (OSTI), ottobre 2021. http://dx.doi.org/10.2172/1827541.

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4

Dumont, R., M. Coyle, D. Oneschuk e J. Potvin. Apparent conductance with electromagnetic anomalies, Pamour, Ontario. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 2002. http://dx.doi.org/10.4095/213898.

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5

LeBrun, Thomas, e Kyle Brindley. TRUST-EABM Contact Thermal Conductance (CTC) Report. Office of Scientific and Technical Information (OSTI), gennaio 2021. http://dx.doi.org/10.2172/1760545.

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6

Cahil, David, G., e Paul, V. Braun. Final Report: Thermal Conductance of Solid-Liquid Interfaces. Office of Scientific and Technical Information (OSTI), maggio 2006. http://dx.doi.org/10.2172/885425.

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7

Norris, Pamela M. Modeling Interfacial Thermal Boundary Conductance of Engineered Interfaces. Fort Belvoir, VA: Defense Technical Information Center, agosto 2014. http://dx.doi.org/10.21236/ada609810.

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8

Dumont, R., M. Coyle, D. Oneschuk e J. Potvin. Apparent conductance with electromagnetic anomalies, Buskegau River, Ontario. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 2002. http://dx.doi.org/10.4095/213889.

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9

Dumont, R., M. Coyle, D. Oneschuk e J. Potvin. Apparent conductance with electromagnetic anomalies, Manning Lake, Ontario. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 2002. http://dx.doi.org/10.4095/213896.

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10

Dumont, R., M. Coyle, D. Oneschuk e J. Potvin. Apparent conductance with electromagnetic anomalies, Kamiskotia Lake, Ontario. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 2002. http://dx.doi.org/10.4095/213897.

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