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A modified procedure was developed for the measurement of the effective air exchange rate, which represents the relationship between the pollutants emitted from indoor sources and the residents level of exposure, by placing the dosers of tracer gas at locations that resemble indoor emission sources. To measure the 24-h-average effective air exchange rates in future surveys based on this procedure, a low-cost, easy-to-use perfluorocarbon tracer (PFT) doser with a stable dosing rate was developed by using double glass vials, a needle, a polyethylene-sintered filter, and a diffusion tube. Carbon molecular sieve cartridges and carbon disulfide (CS2) were used for passive sampling and extraction of the tracer gas, respectively. Recovery efficiencies, sampling rates, and lower detection limits for 24-h sampling of hexafluorobenzene, octafluorotoluene, and perfluoroallylbenzene were 40% ± 3%, 72% ± 5%, and 84% ± 6%; 10.5 ± 1.1, 14.4 ± 1.4, and 12.2 ± 0.49 mL min−1; and 0.20, 0.17, and 0.26 μg m-3,

Exhaust ventilation systems operate by pulling outside air into the home. An exhaust ventilation system is the simplest of whole-house ventilation systems, as they can function with a single exhaust fan. Some exhaust ventilation systems also include ducts, but they arent necessary for operation.. There are a variety of exhaust ventilation configurations in use, but all exhaust systems create negative pressure inside the home. Negative pressure occurs whenever the outside air pressure exceeds that of the homes interior.. As a result of negative pressure, fresh air is pulled into the home through any openings between the exterior and interior of the structure, while stale air is blown out of the exhaust fan. Optionally, an exhaust ventilation system may be equipped with installed intake vents that permit more air to enter the home. However, if the openings are too large, air movement may be negatively affected, so this feature is often omitted from exhaust ventilation systems.. Exhaust ...

Apart from ventilation system A (which was added at the request of housing associations because they represent a significant share of the housing stock) all other ventilation systems are code compliant. The large variations both in CO2-excess dose per person and in the standard deviation illustrate that there are considerable differences in the IAQ-performance of code compliant ventilation systems. The large extent of these differences in achieved air exchange rates was not fully anticipated, especially given the fact that all ventilation systems achieved overall air exchange rates well above 10 l/s per person, which complies with the highest IAQ category (prEN 16798-1:2015) . The data in fact illustrates to what extent the ventilation systems are capable of achieving the requested air exchange rates per person in the various habitable rooms. Ventilation systems that apply a mechanical component in the air exchange provisions in habitable rooms (either supply, exhaust or both) perform ...

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First, we simply cannot mix the air in the troposphere and the stratosphere. The troposphere is the layer of the atmosphere at the earths surface. The troposphere contains 75% of all the air found in our atmosphere and 99% of the water vapor. The air in the troposphere is in constant motion, with both horizontal and vertical air currents. The combination of vigorous air movement and water vapor creates weather. The troposphere is capped by a thin layer known as the tropopause, which is a region of stable temperature that helps to confine most weather phenomena and bad ozone to the troposphere. The stratosphere is the second layer in the atmosphere from the earths surface. The lower part of the stratosphere contains the ozone layer. The ozone layer prevents harmful ultraviolet radiation from reaching the earths surface by absorbing the rays, causing the ozone layer and the air above it to warm. The warm air tends to remain in the upper stratosphere, and cool air remains lower. The layering ...

What is a microwave-convection oven Installed frequently in recreational vehicles, it is a combination of a regular convection oven with a microwave. Users are able to use the quick interior cooking of microwaves combined with the surface browning of hot air. Convection cooking allows for the interior cooking of a traditional oven, just hotter and faster. Convection oven technology uses a fan to force air movement and heat up the full interior of the microwave to cook food from the inside out. Thats why you can use convection microwaves to bake and roast things that would otherwise be cooked too quickly (and not thoroughly) with just a regular microwave. The…. ...

Conduction: the flow of heat through solid materials due to a temperature difference across the material. Think of a frying pan. Would you rather pick up a hot cast iron pan or a wood handled one? We all knew the answer to that one when we were 2 or 3 years old. Wood is a better insulator than iron. Insulation is a better insulator than wood.. Convection: occurs when gases and liquids are able to move and carry heat with them. Think of a cold draft on your feet on a winters night. Hot air rises and cold air is heavier so it falls. When you have both at the same time it creates a draft.. Radiation: occurs when heat is transferred from one surface to another without contact (conduction) or air movement (convection). An object that possesses more heat energy will radiate the heat through space to an object that is colder as we mentioned above. On a hot summer day would you rather stand in the sunshine or in the shade? The air temperature is the same but the experience of heat is a result of the ...

A building which is well insulated and sufficiently air tight to be energy efficient will generally need some kind of ventilation system to provide fresh air and control moisture. In the past, buildings were ventilated through uncontrolled air movement and infiltration through small cracks and holes in the building envelope, but in energy efficient buildings, those small cracks and holes dont exist. Some ventilation can be achieved by opening windows and doors, especially with the addition of passive solar ventilation, whole house fans and other spot ventilation. When a central heating or cooling system is in use, however, it would be counterproductive to use any of those ventilation strategies, and some form of whole-house ventilation would be more appropriate. Exhaust Ventilation Systems work by decreasing the air pressure inside of a building, causing indoor air to leave the building, while outside air enters the building through leaks in the building shell and intentional passive vents. ...

Looking for contact anemometer? Find out information about contact anemometer. An anemometer which actuates an electrical contact at a rate dependent upon the wind speed. Also known as contact-cup anemometer Explanation of contact anemometer

This furnace was old and cost a ton of money to operate without much air movement during the first 17 years of this homeowners time in this west side home.. We were called in to replace the old beast with a new high efficient model and add A/C to keep things cool and the air clean during our hot, often smokey summers.. The new system is a great improvement in installation, efficiency, and operating costs. In fact, when we went back to give the homeowner their Northwestern Energy E+ rebate paperwork we were surprised to hear that they felt air moving out of ducts they had no idea worked, including in their main living room. Thats great to hear and we were happy to help restore balanced heat to this incredible home.. - The Axil Team. ...

Using satellite data and computer models, the scientists found that once the pollutants are in the stratosphere they circulate around the globe for several years.. Some eventually descend back into the lower atmosphere, while others break apart, read a statement on the study.. Researchers fear that the impact of Asian pollutants on the stratosphere may increase in the next decades due to fierce industrial growth in countries like China and India.. Scientists however do not know the impact of climate change on the Asian monsoon, unsure if it will strengthen or weaken the monsoons vertical air movements.. The international study, published in the March 26 edition of the journal Science, was funded by the National Science Foundation together with the National Aeronautics and Space Administration and the Canadian Space Agency.. ...

Simulaids ALS Advanced Life Support Manikin with include oral and nasal airways for intubation, bag valve mask ventilation, delivery of supplemental oxygen, palpation of carotid pulse, ABC assessment, separate right and left lungs, auscultation of air movement, chest compres

Simulaids A.L.S Manikin with include oral and nasal airways for intubation, bag valve mask ventilation, delivery of supplemental oxygen, palpation of carotid pulse, ABC assessment, separate right and left lungs, auscultation of air movement, chest compres

Obstructive Sleep Apnea (OSA) is a breathing disorder that occurs during sleep. It occurs when the throat muscles and the tongue relax during sleep and partly or completely block the airway. The dynamic intermittent obstruction to breathing can sometimes be seen at the entrance to the voice box in contrast to the relatively fixed blockage seen within the nose. The nocturnal obstruction to breathing can be complete or partial. A total blockage to breathing with no air movement for ten or more seconds is called an apnea. OSA patients may have apneic events that last 45 seconds or even longer and happen multiple times during the night.. When breathing ceases for long periods of time, oxygen levels in the blood will drop. The lowest oxygen saturation (LSAT) recorded during sleep is one feature used as an indicator of disease severity. Partial blockages to breathing that reduce airflow below normal by more than one half for more than ten seconds are called hypopneas. The average number of apneas and ...

1.0 Introduction This article provides an overview of the Royal Air Forces Chinook Display Team. 2.0 What is the Purpose of the RAF Chinook Display Team? The Royal Air Force (RAF) Chinook Display Team (CDT) displays (almost) every year throughout the season at a number of national air shows using commentary and air movements to…

In the Majority world, in-patient beds are often clustered in gender-segregated wards of 10-20 beds. Often these wards are one large room where patient personal space and privacy is very limited. This is in stark contrast to the private or semi-private rooms that are common in Western hospitals. As they are able, patients seek out spaces beyond the confined, interior ward area - both for personal space and for exposure to outdoor elements. Outdoor spaces often allow for cooler, fresher air away from the constriction of ward walls. Patients in Africa (for example) often have a culturally- or socially-established idea that the healing process is enhanced by being outside. Whether it is sunshine, air movement, breathing fresh, non-infectious air, or engaging with nature, the outdoor environment is held to be conducive to healing. Western designers are similarly exploring Biophilic Design, as the integration of experiencing nature in the built environment. This non-medical intervention leads to ...

I like to bring a closed cell pad for warmth and a Therm-a-rest for comfort. I see that Thermarest has a new compact mattress - the ultralight NeoAir mattress - that may provide both features in one light package.. The Therm-a-Rest NeoAir mattress packs to the size of a one liter bottle and weighs 14 ounces for a regular size. The NeoAir mattress is designed to be warm to sleep on, thanks to a Reflective Barrier that reflects heat back to the users body and reduces convective heat loss to the ground. A 2nd technology, the Triangular Core Matrix, contributes to the warmth by creating a multitude of air cells that minimize air movement and convective cooling. Unfortunately the NeoAir wont be available until April 2009. DARN. Read the whole press release here.. I got a response from Cascade Designs regarding my query into the suitability of this product for winter camping.. I also want to verify with you that the NeoAir is intended as a 3-season mattress. We consider any mattress with an R-Value ...

There are a large number of insect and disease pests that attack apples and pears. Good pest management begins with good horticultural management. Removing last years leaves, or at least mowing them, helps reduce the population of overwintered apple scab fungus spores and some insect pests. Opening the tree up to sunlight and air movement not only improves spray coverage, it reduces humidity for scab and other fungal diseases and promotes fruit bud formation and overall tree health. Contact Dr. Renae Moran at University of Maine Highmoor Farm, [email protected] or 207.933.2100, for help on horticultural issues such as punting, fertilizer, rootstock, and variety selection.. Weed control is important to prevent competition with newly planted trees. Once trees are established, managing ground cover vegetation in a home orchard by mowing is adequate. Maintaining bare soil around the base of an apple tree is not recommended as the presence of ground cover provides insulation against low winter ...

Danger: Contains mineral spirits. Harmful or fatal if swallowed. Do not take internally. Skin irritant. Avoid contact with skin and eyes. Wear rubber gloves and safety glasses when handling. Combustible. Do not use or store near heat, sparks, flame or other source of ignition. Close container after each use. Avoid inhalation. If using indoors, open all windows and doors to make sure there is fresh air movement. Keep out of reach of children. If swallowed, do not induce vomiting. Call physician immediately. For skin contact: Wash thoroughly with soap and water. If irritation persists, get medical attention. For eye contact: Immediately flush thoroughly with water, then remove contact lenses. Continue to flush eyes with water for at least 15 minutes. If irritation persists, get medical attention. If affected by inhalation, immediately remove to fresh air. If symptoms persist, call physician. Keep out of reach of children. This product contains a chemical known to the State of California to cause ...

Danger: Contains mineral spirits. Harmful or fatal if swallowed. Do not take internally. Skin irritant. Avoid contact with skin and eyes. Wear rubber gloves and safety glasses when handling. Combustible. Do not use or store near heat, sparks, flame or other source of ignition. Close container after each use. Avoid inhalation. If using indoors, open all windows and doors to make sure there is fresh air movement. Keep out of reach of children. If swallowed, do not induce vomiting. Call physician immediately. For skin contact: Wash thoroughly with soap and water. If irritation persists, get medical attention. For eye contact: Immediately flush thoroughly with water, then remove contact lenses. Continue to flush eyes with water for at least 15 minutes. If irritation persists, get medical attention. If affected by inhalation, immediately remove to fresh air. If symptoms persist, call physician. Keep out of reach of children. This product contains a chemical known to the State of California to cause ...

This months topic on the Green Moms carnival is global warming being hosted over at Not Quite Crunchy Chicken. How many of you are freezing as much as I am? How many of you are tempted to crank that thermostat up until your toes are all warm and snuggly?. Stop right there. If you dont show some love to your heating and cooling ducts, then your toes might be snuggly, but your wallet will be empty. According to Energy Star, a typical house loses 20% of the air movement through its duct system due to leaks, holes, and poorly connected ducts. So our systems run longer to meet the demand of our heating and cooling systems and our energy bills sore. Worse yet, the increase energy use causes more fossil fuel consumption at power plants which contributes to smog, acid rain, and global warming.. What I realized this fall as a volunteer in the energy exhibit area at Twin Maples, a renovated green historic Show House that most people had no ideas that their lack of attention to their ducts could be ...

Gypsum powder-based fertilizer effectively loosens hard subsoil or layers of clay in the garden. It penetrates the clay matrix and loosens its structure. It improves the composition of soil, prevents water runoff and soil erosion, facilitates water and air movement and root growth, converts salty soil into neutral soil, reduces the bulk compactness of tough soil, controls dust erosion, prevents water logging by improving the drainage capability of soil and renders magnesium harmless.. The calcium content of gypsum balances excess micro-nutrients in soil, such as copper, manganese, zinc and iron. It supplies sulfur, improves the grade of produced fruit and prevents diseases. Otherwise, the chemical is neutral and will not change the pH of the soil.. Used In ...

Cockroaches are oval and are flattened in appearance from top to bottom. Their heads are covered by a large, shield-like structure. They have two large eyes and two long antennae. With six long running legs attached to their thorax, they have been recorded at speeds up to three miles per hour.. In the adult cockroach wings may be present, absent or reduced, depending on the species. At the top of the abdomen cockroaches have a pair of jointed appendages, covered by specialized sensory hairs. These are used to detect air movement which can trigger an escape response.. The adult German cockroach is 10 to 15mm long. The Common or Oriental cockroach is 20 to 24mm long.. Cockroaches live in clusters. A pheromone causes them to cluster in harbourage areas such as cracks and crevices. This clustering helps illicit mating and helps in the survival chances of nymphal (infant) cockroaches. Cockroaches are frequently found indoors foraging for food, water and more suitable conditions.. In depth ...

Location: Full sun with some air movement is recommended for persimmon trees in inland areas, although they will tolerate some partial shade. Persimmons grown in cooler areas should have full sun with protection from cooling breezes. As an attractive ornamental the tree fits well in the landscape. It does not compete well with eucalyptus.. Soil: Persimmons can withstand a wide rage of conditions as long as the soil is not overly salty, but does best in deep, well drained loam. A pH range of 6.5 to 7.5 is preferred. The tree has a strong tap root which may mean digging a deeper hole than usual when planting (when on D. kaki stock).. Irrigation: Persimmon trees will withstand short periods of drought, but the fruit will be larger and of higher quality with regular watering. Extreme drought will cause the leaves and fruit to drop prematurely. Any fruit left on the tree will probably sunburn. Some 36 to 48 inches of water are needed annually, applied gradually in spring and tapering off in the fall. ...

Anti Aging Review. The skin, even though you will possibly not believe it, is undoubtedly an organ. Like any other body organ it is recommended to try to possess a healthy one particular. Healthful skin is not only good for on your own-esteem also for your individual effectively-simply being. Should you be interested in supplying your epidermis the care it warrants then keep reading listed below for excellent tips and hints.. Occasionally, it is rather hard to get all the vitamins that your system needs to maintain an attractive, radiant experience. Each day, take a multi-vitamin by means of a capsule, to provide your skin layer using the vital vitamin supplements required to appear your greatest throughout the time.. If you want to get rid of your epidermis, you should try to locate a hobby which you get pleasure from. This is because a pastime helps to reduce tension, that can improve your air movement and decrease any skin breakouts on your skin. Far more tension produces chemicals that cause ...

The prognosis in Ludwigs angina depends primarily on immediate protection of the airway and then on prompt antibiotic - and possibly surgical - treatment of the infection. Mortality in the pre-antibiotic era was 50% but, with the advent of current therapies, has declined to less than 5%.. Symptoms:. Patients with Ludwigs angina typically have a historyof recent dental extraction or of poor oral hygiene anddental pain. Clinical findings are consistent with sepsisand include fever, tachypnea, and tachycardia. Patientsmay be anxious, agitated, and confused. Their symptomscan include swelling and pain in the floor of the mouthand anterior neck, fever, dysphagia, odynophagia, drooling, trismus, toothache, and fetid breath. Hoarseness,stridor, respiratory distress, decreased air movement,cyanosis, and a sniffing position (i.e., the characteristicposture assumed by patients with impending upper airway compromise consisting of an upright posture withthe neck thrust forward and the chin elevated) are ...

Copyright 2015 Air Movement and Control Association International, Inc. , 30 West University Drive, Arlington Heights, Illinois 60004 USA , +1 847 394- ...

Keeping your house cool and comfortable without impacting on the air quality can be challenging, especially in summer. While artificial methods of ventilation such as AC systems and fans have become increasingly popular over the last years, these have some downsides that are worth considering before picking a ventilation system for your hose.. Natural ventilation, instead, can reduce your energy consumption and leverage the force of nature to keep your living environment comfortable and ventilated. Strategically-placed openings in a building can encourage natural movements of wind without the need for mechanical means.. At its very core, natural ventilation works by making the most out of the difference in pressure created between the outside and the inside of your house by air temperature and wind. In turn, this airflow can decrease and increase the internal temperature and provide a suitable and enjoyable environment. ...

The use of natural ventilation systems continues to be a popular feature in low energy, sustainable building design. One feature of natural ventilation is that, depending upon the prevailing climatic or thermal conditions, the airflow through a ventilator can be bi-directional. Aerodynamically, the ventilator, depending upon its construction, may not perform in the same way

Purifier Rebel Logic+ Class II, Type A2 Biosafety Cabinets provide personnel, ISO 5 product and environmental protection from hazardous particulates such as agents that require Biosafety Level 1, 2 or 3 containment. Other applications include work with antineoplastic drugs, genetic material, asbestos and additional substances that generate hazardous airborne particulates.. These biological safety cabinets are designed to discharge HEPA-filtered exhaust air directly into the laboratory, or into an exhaust system through the optional Ventus Canopy Connection. When exhausted, the biosafety cabinets may be used for applications involving minute quantities of volatile toxic chemicals and tracer amounts of radionuclides as an adjunct to microbiological research.. During operation, room air is drawn into the inlet grill to protect the user. The air in the plenum beneath the work surface is a mixture of unfiltered room air and air that has just passed through the work area. This contaminated air is ...

* found in: Purifier® Logic®+ Class II A2 Biosafety Cabinets, Laminar Flow Cabinets, PCR Workstations, Biological Safety Cabinet, Purifier® Cell Logic®+..

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The influence of electrostatic interactions on membrane fouling during the separation of bovine serum albumin (BSA) from solution was studied in a cross-flow ultratiltration system. Experiments were carried out at different pH values between 3.78 and 7.46; and for different ionic strengths between 0.001 M and 0.1 M. The changes in permeate flux, cake layer resistance, zeta potentials of BSA and polyether sulfone (PES) membranes, and electrostatic interaction energies, were evaluated. At all of the ionic conditions studied, PES membranes are negatively charged. However, BSA molecules are either negatively or positively charged depending on the ionic environment. Whereas the cake layer resistance decreased with increasing pH and ionic strength, the permeate fluxes increased. The calculated electrostatic energy was a minimum at the isoelectric point (IEP) of BSA. However, at this point, the cake resistances corresponding to fouling at each ionic strength, were not minimized. Below the IEP of BSA, ...

This study aimed to assess the performance of three zeolite membranes in the removal of trivalent metal ions from aqueous solution using a cross-flow mode of op

Global Cross-flow Membranes Market Professional Survey Report 2017 is a market research report available at US $3500 for a Single User PDF License from RnR Market Research Reports Library.

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The objective of this study has been to clarify to what extent ozone (03) and 03 !limonene in interaction with surface materials has an impact on the indoor air quality in typical low-polluting offices at various, realistic air change rates. Changes of environmental conditions were performed seven days before the chemical sampling. Organic compounds were collected on Tenax TA adsorbent tubes and the samples were analysed by gas chromatography with flame ionisation and mass selective detectors. The concentration of Total Volatile Organic Compounds were as expected found to be inversely proportional to air change rates. Aldehydes and organic acids were found at increased levels when the air change rate was decreased from 1.0 h1 to 0.3 h1. Increased ventilation rate to 3.0 h1 did not induce additional changes in the chemical composition of aldehydes and organic acids. The fractions of aldehydes and organic acids relative to nonreactive alkanes indicated that chemical transformation in the indoor

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TY - JOUR. T1 - Spectrum analysis of turbulence in the canine ascending aorta measured with a hot-film anemometer. AU - Yamaguchi, Takami. AU - Kikkawa, Sho. AU - Tanishita, Kazuo. AU - Sugawara, Motoaki. PY - 1988. Y1 - 1988. N2 - We measured turbulence velocity in the canine ascending aorta using a hot-film anemometer. Blood flow velocity was measured at various points across the ascending aorta approximately 1.5-2 times the diameter downstream from the aortic valve. The turbulence spectrum was calculated and its characteristics were examined in connection with the mean Reynolds number and/or measuring positions. In the higher wave number range the values of the turbulence spectra were higher at larger mean Reynolds number. In the higher wave number range, the values of the turbulence spectra were higher at points closer to the centerline of the aorta, when the mean Reynolds number was relatively large. The patterns of the turbulence spectra at various points outside the boundary layer on the ...

|p| With this fume hood, exhaust air volume is equal to the auxiliary supply air—therefore there is no required air from the laboratory space. This can be achieved with the sash half-open and a face velocity of 100 feet per minute. Auxiliary air fume hoods are available in 4′, 5′, and 6′ widths. All electrical components and services are UL and CSA listed. Supply air ducting and remote blower are required. Shown with optional service fixtures, plumbing and electrical, airflow monitor, and work surface.|/p|

At LJ Pratley & Partners, we offer an extensive portfolio of natural ventilation solutions from leading manufacturers including Ultraflex Control Systems (UCS), STG Beikirch, WindowMaster, Comunello and Topp.

Various commercially available natural ventilation devices supply fresh air without mechanical assistance. These devices offer a low-energy alternative to mechanical air handling units. However, they often cannot satisfy recommended ventilation rates due to their dependence on both macro- and microclimate wind speeds. This work examines the feasibility of achieving the recommended fresh air delivery rates without impacting on the device energy requirements. A numerical investigation is carried out using a standard passive stack device geometry combined with a simulated low-powered axial fan. The investigation shows that a low-induced pressure of 20 Pa is enough to satisfy the legislative requirements. Depending on the macroclimate conditions, this induced pressure could be generated from a commercially available solarpowered system. As the fan system is only used in periods of low external wind velocities (1 m/s), it is termed a passive-assisted stack.. ...

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Fresh air in a building brings health benefits and increased comfort level to its occupants. Fresh air provision is considered as an efficient and a healthy solution as it reduces the need for mechanical means to ventilate a building.. For NZEB design goal, passive design measures can be judiciously used to influence movement of outside air into a built space by bringing in fresh air. These interventions can reduce and in some cases (in certain climates) completely eliminate reliance on mechanical means to ventilate a building. Thus largely affecting air-conditioning loads.. Various forms such as appropriate orientation and form, openings in building envelope (windows, doors and ventilators), operable windows, internal space planning, etc. are various natural ventilation strategies that can be adopted. Other advanced ventilation techniques are courtyard effect, stack effect, wind tower, or air earth tunnels.. ...

Though evaporative cooling pads can do a great job of keeping our birds cool during hot weather by reducing the temperature of the incoming air 20°F or more, it is important to keep in mind that this cooling comes at a price, namely increased humidity and reduced air speed.. Though there is no practical way of reducing the humidity produced by evaporative cooling pads without reducing the cooling, the reduction in air speed caused by the restrictive nature of pad systems can be somewhat offset by simply increasing the amount of pad installed on a house. As pad area is increased, the velocity through the pad decreases, which in turn lowers the static pressure the tunnel fans are working against. As static pressure decreases, the air moving capacity of the fans increases, which leads to higher air speeds, and therefore increased bird cooling. The question of course is exactly how effective is increasing pad area in increasing air speed/bird cooling?. A study was conducted on a recently ...

TY - JOUR. T1 - Ice-Accretion Characteristics in a Cold Air Stream with Seawater Droplet. AU - Horibe, Akihiko. PY - 1992. Y1 - 1992. M3 - Article. VL - 9. SP - 1-. JO - Trans. of Japanese Association of Refrigeration. JF - Trans. of Japanese Association of Refrigeration. ER - ...