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Showing 1 to 20 of 611 for “"relative humidity"”.
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The development of a direct reading relative humidity instrument
… conducted on all available references concerning humidity measurement, and visits were made to the American Instrument Company in Silver Springs, Maryland, and the National Bureau of Standards. The survey evaluated the instruments in use today and also explored many of the ideas and concepts that …
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Dynamic subdivided relative humidity model of a polymer electrolyte membrane fuel cell
The development of a control-oriented dynamic relative humidity model for a polymer electrolyte membrane (PEM) fuel cell stack is presented. This model is integrated with a first law based thermal model, which tracks energy flow within four defined control volumes in the fuel cell; the cathode …
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Effect of relative humidity on the fatigue characteristics of mild steel in reversed torsion
… were fatigued in air of zero-five percent relative humidity and in air of 90-95 percent relative humidity. The unnotched specimens were tested in air at three relative humidity levels: 0-5 percent, 20-25 percent, and 90-95 percent. High humidity had a detrimental effect only on the fatigue …
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Effect of relative humidity on fatigue of anodized 2024-T351 aluminum in completely reversed torsion
… environment was provided by varying the relative humidity of air around the specimens during fatigue. The effect of water vapor on fatigue of aluminum (and alloys) have been previously established by other investigators. The aluminum oxide coating was grown on the metal substrate to two …
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Increases and decreases in the fine mode fraction of aerosol optical depth with increasing relative humidity
… can either increase or decrease with increasing relative humidity, depending on the initial function of aerosols. Instinctively it appears that since the aerosols swell up according to their hygroscopic properties with an increase in relative humidity, the contribution of particles having radius …
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Experimental apparatus for measuring moisture transfer in porous materials subject to relative humidity and temperature differences
… allowing nonisothermal test conditions. The relative humidity is maintained without the use of saturated salt solutions. The moisture transfer rate is measured by periodically weighing a desiccant column used to absorb moisture as result of diffusion across the specimen. The apparatus was …
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Viability of Viruses in Suspended Aerosols and Stationary Droplets as a Function of Relative Humidity and Media Composition
… and droplets is affected by factors such as relative humidity (RH) and the chemical composition of the liquid media, but the effects of these stressors on the viability of viruses have not been extensively studied. The overall objective of this work was to investigate the effects of RH and …
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Probing the influence of relative humidity and temperature on the sulfonated silica ceramic carbon electrode for PEM fuel cell operation
Operation of fuel cells under low relative humidity (RH) and high temperature is a useful way to cut-down cost and increase performance. However, the Nafion ionomer employed in the electrode of the conventional fuel cells performs poorly under low RH and temperatures above 80 °C due to dehydration. …
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A study of the effect of temperature and relative humidity on the drying rate and equilibrium moisture content of hay
… data showing the effect of the temperature and relative humidity or the air supply on the drying rate and equilibrium moisture content of hay. The equilibrium moisture content is that moisture content at which no further moisture will be removed from the hay by a particular combination of …
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Design and performance testing of a novel ceiling panel for simultaneous heat and moisture transfer to moderate indoor temperature and relative humidity
… interest in this research is the indoor humidity level. High indoor humidity levels can make the indoor air feel stuffy at warm temperatures and reduce the amount of moisture that can be removed from a person’s body, making a person feel warm. On the other hand, low indoor humidity levels …
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Investigation of Single and Multiple Binding Interactions Between Volatile Flavor Compounds and Soy Proteins Under Controlled Relative Humidity by Inverse Gas Chromatography (Igc)
These above mentioned studies are useful to the food industry and will aid in development of new processes for off-flavor removal in soy products, improve masking agent design and allow target for preferential flavor release for dry foods and ingredients.
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Aerosol particle light scattering at a perturbed mid-latitude continental northern hemisphere site and its dependence on relative humidity, wavelength of light, particle size and composition
… and back-scattering coefficients as functions of relative humidity, particle composition and size, and wavelength of light.
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Determining organic vapor cartridge breakthrough characteristics of JP-8 during aircraft fuel tank entry operations
… 1200 parts per million) of fuel vapor and two relative humidity levels (50 and 80 percent). The impact on service life of (1) high relative humidity conditions and (2) prior static exposure to fuel vapor were evaluated.;This study concluded that the 80 percent relative humidity test condition …
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