Particles air-borne

A weather-protected Type I machine is a guarded machine with its ventilating passages so constructed as to minimize the entrance of rain, snow and air-borne particles to the electric parts. 

A weather-protected Type II machine shall have, in addition to the enclosure defined for a weather-protected Type I machine, its ventilating passages at both intake and discharge so arranged that high-velocity air and air-borne particles blown into the machine by... 

In our application of the transformation given in Equation 1 to these data, we restrict t to positive values. This restriction is based on models of the various sources of processing contamination. Possible sources of contamination include the chemical reagents which might add a constant level to the blank and air borne particles which might add a variable level with positive skewness. There does not seem to be any reason to include a constant level that is negative. Therefore, we have adopted this restriction. 

These are not gasses they are vapors and/or air borne particles. The agent must be delivered in sufficient quantity to kill/injure, and that defines when/how it s used. Every day we have a morning and evening inversion where stuff, suspended in the air gets pushed down. This inversion is why allergies (pollen) and air pollution are worst at these times of the day. 

It is one of the most sensitive and specific methods available for the determination of trace quantities of a wide range elements in such diverse media as terrestial, lunar and meteoritic materials, marine sediments, air borne particles, natural water, biological material, hair, drugs, coal, petroleum, blood, etc. 

Harrison RM, Giorio C, Beddows DC, Dall Osto M (2010) Size distribution of air-borne particles controls outcomes of epidemiological studies. Sci Total Environ 409 289-293... 

The major element content and mineralogy of air-borne particles reflect closely those of continental soils and shales, although atmospheric particulates also include materials of oceanic origin (Delaney et al., 1967), and show considerable enrichments in some trace metals (Buat-Menard and Chesselet, 1979). The average composition of shales and soils (Table 9.8) was chosen to represent the properties of dust transported from the continents to the ocean. Fluxes of elements in atmospheric transport to the ocean are given in Table 9.14. 

The strong survival potential of the rock biofilm indicates that the permanent presence of water is not the most essential attribute for the evolution and spread of life (Reysenbach Cady, 2001 Costerton Stoodley, 2003). The existence of a microbial biofilm on the rock surface is more determined by the interactions of the organisms with the mineral substrate. Lack of water even over several years is tolerated by rock biofilms. However sporadic the supply might be in subaerial conditions, some water from rain, snow, ice, dew, or fog is always present in terrestrial environments. However, for chemoorganotroph life forms the mineral substrate harbours additional difficulties as it is, or almost immediately becomes, deficient in organic matter, as nutrients and energy resources reach this habitat mainly from the atmosphere as particulates and volatile matter. This difficulty is partially overcome by the presence of EPS, which significantly increase the residence time of air-borne particles on any rock surface. 

Climet manufacture the following range of instruments for liquid-borne and air-borne particle counting. 

Since particle counting has been very sensitive to environmental contamination of air-borne particles and particles adsorbed on glassware, special precautions were taken. Before use, a thorough cleaning of the glassware with chromic acid was achieved. Furthermore, recipients were always rinsed twice before sampling with the water to be examined. When. samples were taken on site, erlenmeyer flasks were used for water sample collection. They were filled up to the neck and immediately sealed with glass stoppers, previously rinsed with the water to be sampled. 

Dusty winds over deserted territories carry air-born particles that influence the wind profile. A similar situation can be observed over the storming ocean when air-born droplets sized from 0.1 to 1 mm are lifted to some elevations thus distorting the wind velocity distribution [655], Accounting for the wind and droplet motion, and finally for their evaporation, provides an important estimate of the ocean heat flux to the Earth atmosphere [70],... 

Using HEPA filtered accommodation which reduces exposure to air-borne particles. 

The Army Chemical Corps has developed a hypothetical system for the detection and early warning of biological particulates in air and has developed prototype electronic equipment for measuring and counting air-borne particles... 

Every year regulatory institutions decrease the amount of various toxic species allowed in air. In air analysis, air-borne particles are collected using various types of filters and MAE has been utilized... 

The base set of partition coefficients needed for most multimedia models include the Henry s law constant (JCh) to describe partitioning between air and water, partition coefficients between water and various solid phases in soils, sediments, and particulate matter in the water coliunn (fCa), and a coefficient describing partitioning between air-borne particles and air (Kp). If not available from direct experimental measurements, soUd phase-water partition coefficients are often derived from the organic carbon-water partition coefficient, Kqc (Eq. 4), the underlying assumption being that sorption into organic matter dominates the overall sorption to bulk solid material. 

High Efficiency Particulate Air (filter)—A filter that is at least 99.97% efficient in the filtration of air borne particles that are at least 0.3 microns in diameter. 

MELCOR has been used to simulate ice condenser tests 11-6 and 16-11, two of a series of large-scale experiments conducted at the High Bay Test Facility (HBTF) at Pacific Northwest Laboratories (PNL) to investigate the extent to which an ice condenser may capture and retain air-borne particles [40]. Experiment 11-6 was a low-flow test, while experiment 16-11 was a relatively high-flow test in both tests, ZnS was used as the aerosol and temperatures and particle retention were monitored. 

Beryllium and its alloys must be heated with care. Handling or processing produces dust, chips, scale, slivers, mists, or fumes. Air-borne particles of beryllium and beryllium oxide are extremely toxic and have serious latent effects. Abrasives and chemicals used with beryllium must be property disposed. One procedure is to degrease with trichloroethylene (TCE), followed by immersion in the etching solution (Table 6.7) for 5-10 min at 20 °C ... 

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