Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 24 for “"air humidity"”.
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Cooling rates of dummies under various degrees of air humidity, wind speed and air temperature
Henssge observed that even a slight but permanent air movement accelerates cooling of a naked body significantly. However in those experimental studies the rate of air movement was not quantified. Today Henssge’s Nomogram method of thermometric thanatochronometry (mathematic estimation of the …
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Dehydration of apple rings
The effect of air humidity and velocity, tray surface and ring thickness, on the drying rates of apple rings, is reported. Drying rates for different apple slice thicknesses are correlated with the total moisture content of the fruit and the air relative humidity. Also reported are results on the …
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Mosquitos (Diptera, Culicidae) das regiões de Pendotiba e oceânica de Niterói (Rio de Janeiro, Brasil)
… monthly female frequencies and temperature, air humidity and precipitation monthly índices was done, using Sperman correlation in Statistica 4.2 program. Female mosquitoes (Culicidae) were collected weekly in human bait, during the period from March 1997 to February 1998, in three different …
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Effect of ambient conditions and fuel properties on homogeneous charge compression ignition engine operation
… project examined the impact of changes in intake air temperature and humidity on HCCI operation. Exhaust cam phasing was used to control load, and intake cam phasing was use to produce a change in combustion phasing. Cam timing control was largely able to compensate for changes in combustion due …
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The effect of domestic mechanical heat recovery ventilation on asthma control of patients allergic to the house dust mite
… of asthma. As house dust mites are sensitive to humidity, an additional strategy would be to reduce indoor air humidity by improving ventilation. A randomised, double-blind placebo-controlled study examined the effect of the installation of domestic mechanical heat recovery ventilation on asthma …
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Simulation of deep-bed drying of Virginia peanuts to minimize energy use
… Virginia-type peanuts under 14 different drying air conditions. Selected empirical and semi-theoretical models available for modeling thin-layer drying rates were fitted to the collected data using nonlinear regression techniques. The modified Page's model and the two-term exponential model …
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A numerical analysis of condenser performance of a seawater desalination system
… in the analysis were the face velocity of air, the water velocity, and the number of rows of tubes. The numerical analysis was done based on basic heat exchanger analysis using e-NTU method for a dry case, and using a j-factor correlation that was developed by McQuiston for studying the wet …
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Nonlinear Polymer Nanocomposite for Field Grading in Medium-Voltage Power Converters under High-Altitude and Humid Environments
… at conductor-ceramic-silicone and conductor-FR4-air interfaces, leading to premature partial discharges and breakdown. To mitigate these effects, a PNC coating composed of a polymer matrix with dispersed conductive nanoparticles was applied as a conformal field-grading layer. Electrostatic force …
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Dynamic modeling, validation, and control for vapor compression systems
… method is derived which captures the effects of air humidity. Experimental validation demonstrates that this augmented model more accurately predicts both air-side and refrigerant-side outputs at high humidity in addition to providing accurate predictions of liquid condensate formation and air …
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A trial evaluation of the participatory action oriented training programme in small and medium scale enterprises in Vietnam
… cross-sectional studies using managers’ questionnaires (n=69), environmental measurements (personal dust (n=360), static dust (n=360), toxic gases (n=72), noise (n=540), lighting (n=900), air temperature (n=720), air humidity (n=720), air velocity (n=720)). Data were also collected quarterly …
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Interactions between Atmospheric Deep Convection and the Surrounding Environment
… of precipitation extremes with surface specific humidity, providing a foundation for its use as a baseline prediction for changes in extreme rainfall in a warming world. Second, I focus on explaining observations that suggest a link between high atmospheric aerosol concentrations and more …
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Heat pipe dehumidification for supermarket energy savings
… of using a heat pipe installed in the air conditioning unit of a supermarket to increase the level of dehumidification of the inside air. This dehumidification is expected to reduce the energy consumption of the refrigeration system due to an improved efficiency of the heat transfer at …
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Holocene climate and environmental dynamics on the Tristan da Cunha island group, South Atlantic
… implies a substantial increase in effective humidity probably by precipitation. The cause of this change was probably a northward shift of the Southern Hemisphere westerlies, related to a large scale reorganization of the circulation system. This was probably caused by cooling of the Southern …
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Durability performance of frp strenghtened concrete beams and columns exposed to hygrothermal environment
… and humid weather. High temperature, wind, and air humidity in many hot climates can all have a negative impact on the performance of concrete structures. The most important factors are temperature and humidity - often times these effects are not immediately evident and develop years later - …
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Experimento de fluxo de sedimentos em um segmento de campo de dunas eólicas costeiras de Jenipabu - Litoral oriental do Rio Grande do Norte.
… intensity of winds, precipitation and relative air humidity in the region, from the Estação Meteorológica de Natal , located 12 km from the study area. The sediments collected were treated and the data obtained permitted calculating the ratio of sediment transport. In September, the …
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Towards a coupled δ18O sugar and δ2H n-alkane approach in paleoclimate research
… is most rigorously controlled by relative air humidity (RH), whereas temperature is of minor importance. A coupled δ18Osugar-δ2Hn-alkane approach on topsoils was applied for the first time to the above mentioned Argentinian climate transect. Based on the premise that the sugar and n-alkane …
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Überlegungen zu einer sich selbst steuernden Wirbelschichtanlage
Eines der größten Probleme bei Granulationsprozessen in der pharmazeutischen Industrie ist die Feuchtigkeit der Prozessluft. Kann bzw. möchte man die Luft aus ökonomischen oder sonstigen Gründen hinsichtlich ihres absoluten Feuchtgehalts nicht konditionieren, bleibt bei hoher Luftfeuchte – wie sie …
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Salt hydrates for thermochemical energy storage
… salts when reacted with water vapour in air are hydrated and generate heat. Salt hydrates have often been chosen for space heating application due to their high energy density, suitable dehydration temperatures and water vapour being a safe and cheap reaction partner. However, this method …
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Improved Desiccant Coatings for Heat and Water Vapour Transfer on the Matrix Surfaces of Air-To-Air Regenerative Wheels
Air-to-air energy recovery wheels are now widely used in industry and buildings; however, the effectiveness of water vapor exchange in these regenerative wheels appears to be much lower than may be economically feasible. The purpose of this research is to investigate the feasibility of using …
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Development of Aircraft Wake Vortex Dynamic Separations Using Computer Simulation and Modeling
… procedures and technologies in order to decrease aircraft separations, which could result in a runway capacity increase. Aircraft separation is a major obstacle to increasing the operational efficiency of the final approach segment and the runway. An aircraft in motion creates an invisible …
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