Search results for " Conductivity"

showing 4 items of 794 documents

Humidity of Anaesthetic Gases with Respect to Low Flow Anaesthesia

1994

It has been demonstrated in an experimental study in swine using the scanning electron microscope that a rebreathing technique utilising minimal fresh gas flowrates significantly improves climatization of anaesthetic gases. Consequently, effects of various anaesthetic techniques on airway climate must be assessed, which covers the need for suitable measuring devices. Basic principles and methods of humidity measurement in flowing anaesthetic gases include gravimetric hygrometry, dew point hygrometry, wet-dry bulb psychrometry, mass spectrometry, spectroscopic hygrometry and electrical hygrometry. A custom-made apparatus for continuous measurement of humidity and temperature in the inspired…

AdultHot TemperatureTime FactorsSwineThermometersPartial PressureAnalytical chemistryBronchiCritical Care and Intensive Care MedicineAbsorption03 medical and health sciences0302 clinical medicineAnesthesia Closed-CircuitTidal VolumeAnimalsHumansMedicineCiliaDesiccation030223 otorhinolaryngologyMoistureHygrometerbusiness.industryElectric ConductivityWaterHumidityHumidity030208 emergency & critical care medicineEquipment DesignPartial pressureRespiration ArtificialFresh gas flowVolumetric flow rateTracheaMucusAnesthesiology and Pain MedicineDew pointAnesthesiaAnesthetics InhalationGravimetric analysisVolatilizationPulmonary VentilationbusinessAnaesthesia and Intensive Care
researchProduct

Maximizing phonon thermal conductance for ballistic membranes

2007

At low temperatures, phonon scattering can become so weak that phonon transport becomes ballistic. We calculate the ballistic phonon conductance G for membranes using elasticity theory, considering the transition from three to two dimensions. We discuss the temperature and thickness dependence and especially concentrate on the issue of material parameters. For all membrane thicknesses, the best conductors have, counter-intuitively, the lowest speed of sound.

HistoryCondensed Matter - Materials ScienceMaterials sciencePhonon scatteringCondensed matter physicsCondensed Matter - Mesoscale and Nanoscale PhysicsPhononScatteringConductanceMaterials Science (cond-mat.mtrl-sci)FOS: Physical sciences02 engineering and technologyElasticity (physics)021001 nanoscience & nanotechnologyCondensed Matter::Mesoscopic Systems and Quantum Hall Effect01 natural sciencesComputer Science ApplicationsEducationThermal conductivityMembraneSpeed of sound0103 physical sciencesMesoscale and Nanoscale Physics (cond-mat.mes-hall)010306 general physics0210 nano-technology
researchProduct

Thermodynamics of computation and linear stability limits of superfluid refrigeration of a model computing array

2019

We analyze the stability of the temperature profile of an array of computing nanodevices refrigerated by flowing superfluid helium, under variations in temperature, computing rate, and barycentric velocity of helium. It turns out that if the variation in dissipated energy per bit with respect to temperature variations is higher than some critical values, proportional to the effective thermal conductivity of the array, then the steady-state temperature profiles become unstable and refrigeration efficiency is lost. Furthermore, a restriction on the maximum rate of variation in the local computation rate is found.

General MathematicsComputationGeneral Physics and Astronomychemistry.chemical_element01 natural sciences010305 fluids & plasmasSuperfluidityThermal conductivityStability analysi0103 physical sciencesComputer refrigeration; Stability analysis; Superfluid Helium; Thermodynamics of Computation010306 general physicsComputer refrigerationSettore MAT/07 - Fisica MatematicaHeliumPhysicsApplied MathematicsRefrigerationStability analysisMechanicsDissipationThermodynamics of ComputationchemistrySuperfluid helium-4Linear stabilitySuperfluid Helium
researchProduct

A simplified method based on Beerkan infiltration run

2013

A simplified method based on Beerkan infiltration run (SBI) to determine field saturated soil hydraulic conductivity

A simplified method based on Beerkan infiltration run (SBI)soil hydraulic conductivityA simplified method based on Beerkan infiltration run (SBI) soil hydraulic conductivity
researchProduct