• grains
  • Dust in the atmosphere is produced by saltation and sandblasting of sand-sized grains, and it is transported through the troposphere . (wikipedia.org)
  • The images and data revealed mountains as high as 22 km, atomic hydrogen and oxygen in the upper atmosphere, surface temperatures ranging from −110 °C to +13 °C, surface pressures of 5.5 to 6 mb, water vapor concentrations 5000 times less than in Earth's atmosphere, the base of the ionosphere starting at 80 to 110 km altitude, and grains from dust storms as high as 7 km in the atmosphere. (wikipedia.org)
  • Crossing barriers in planetesimal formation: The growth of mm-dust aggregates with large constituent grains. (wikipedia.org)
  • In the case of the Solar System, this can be thought of as affecting dust grains from 1 µm to 1 mm in diameter. (wikipedia.org)
  • atmosphere
  • Road dust is a significant source contributing to the generation and release of particulate matter into the atmosphere. (wikipedia.org)
  • Dust collectors are used in many processes to either recover valuable granular solid or powder from process streams, or to remove granular solid pollutants from exhaust gases prior to venting to the atmosphere. (wikipedia.org)
  • Fernald came under criticism in 1984 when it was learned that the plant was releasing millions of pounds of uranium dust into the atmosphere, causing major radioactive contamination of the surrounding areas. (wikipedia.org)
  • clouds
  • Already in 1970 the Nimbus weather satellite picked up dust clouds over the Atlantic. (fao.org)
  • Unable to reprogram the mission computers, both Mars 2 and Mars 3 dispatched their landers immediately, and the orbiters used up a significant portion of their available data resources in snapping images of the featureless dust clouds below, rather than the surface mapping intended. (wikipedia.org)
  • It is not possible to observe our own shots because of large dust clouds raised in front of the gun. (wikipedia.org)
  • collects
  • At the air inlet, air temperature must be lower than the upper ambient rating of the fan (typically 50 °C/122 °F). The position of air intake is at a point where the least amount of dust, oil, and moisture collects. (wikipedia.org)
  • velocity
  • Atmospheric or wind-borne fugitive dust , also known as aeolian dust , comes from arid and dry regions where high velocity winds are able to remove mostly silt-sized material, deflating susceptible surfaces. (wikipedia.org)
  • This effect causes a large volume of low velocity air to flow through the venturi and out of the air diffuser. (wikipedia.org)
  • Mars
  • By coincidence, a particularly large dust storm on Mars adversely affected the mission. (wikipedia.org)
  • Mars is the site of Olympus Mons, the largest volcano and second-highest known mountain in the Solar System, and of Valles Marineris, one of the largest canyons in the Solar System. (wikipedia.org)
  • In November 2016, NASA reported finding a large amount of underground ice in the Utopia Planitia region of Mars. (wikipedia.org)
  • surfaces
  • One-third of the global land area is covered by dust-producing surfaces, made up of hyper-arid regions like the Sahara which covers 0.9 billion hectares, and drylands which occupy 5.2 billion hectares. (wikipedia.org)
  • Several weeks prior to the accident, maintenance personnel did notice a thick coating of dust on surfaces above the suspended ceiling, but failed to realize the imminent danger it posed. (wikipedia.org)
  • MOLECULES
  • The observation of SiO molecules at early and late phases suggests that silicates may also have formed and we could fit the SED with a combination of 0.3 M {sub ☉} of amorphous carbon and 0.5 M {sub ☉} of silicates, totalling 0.8 M {sub ☉} of dust. (osti.gov)
  • allergens
  • They and their feces and other allergens they produce are major constituents of house dust, but because they are so heavy they are not suspended for long in the air. (wikipedia.org)
  • nose
  • Testing of the tunnel was performed using a full torso mannequin that simulated human breathing and was modified to collect dust entering the nose and mouth. (cdc.gov)
  • The pH of the bulk of the dust was greater than 10, which is irritating to the mucous membranes found in the nose and throat. (barrypopik.com)
  • Therefore
  • Therefore, although severe acute symptoms were reported, the overall dust exposures probably will not have cumulative health implications for the general population in lower Manhattan. (barrypopik.com)
  • Therefore, the working theory from an early point was the rubber dust explosion theory. (wikipedia.org)
  • collectors
  • Five main types of industrial dust collectors are: Inertial separators Fabric filters Wet scrubbers Unit collectors Electrostatic precipitators Inertial separators separate dust from gas streams using a combination of forces, such as centrifugal, gravitational, and inertial. (wikipedia.org)
  • However, their principles of operation are often incorporated into the design of more efficient dust collectors. (wikipedia.org)
  • However, they are seldom used as primary dust collectors because of their large space requirements and low efficiency. (wikipedia.org)
  • blown away
  • This causes dust that is small enough to be affected by this drag, but too large to be blown away from the star by radiation pressure, to spiral slowly into the star. (wikipedia.org)
  • newly
  • The newly measured 70 μm flux constrains the dust temperature, limiting it to nearly a single temperature. (osti.gov)
  • The investigation initially focused on two separate possibilities: a failure of a newly installed gas line, and a large dust explosion. (wikipedia.org)
  • grain
  • The Poynting-Robertson effect, also known as Poynting-Robertson drag, named after John Henry Poynting and Howard P. Robertson, is a process by which solar radiation causes a dust grain orbiting a star to lose angular momentum relative to its orbit around the star. (wikipedia.org)
  • From the perspective of the grain of dust circling a star (panel (a) of the figure), the star's radiation appears to be coming from a slightly forward direction (aberration of light). (wikipedia.org)
  • The angle of aberration is extremely small since the radiation is moving at the speed of light while the dust grain is moving many orders of magnitude slower than that. (wikipedia.org)
  • From the perspective of the star (panel (b) of the figure), the dust grain absorbs sunlight entirely in a radial direction, thus the grain's angular momentum is not affected by it. (wikipedia.org)
  • This anisotropic emission causes the photons to carry away angular momentum from the dust grain. (wikipedia.org)
  • thick
  • But they were unaware that ventilation systems within the room pulled the dust up into the ceiling, where a layer 0.25 to 0.5 inches (6.4 to 12.7 mm) thick had accumulated. (wikipedia.org)
  • settle
  • It could take somewhere between twenty minutes and two hours for dust mites to settle back down out of the air. (wikipedia.org)
  • eliminate
  • Over time, the larger guilds used a variety of shady tactics to eliminate competition until two organizations came to dominate the planet's economic activities: the Morian Mining Coalition and the Kelanis Shipping Guild. (battle.net)
  • known
  • Dust fall into the Atlantic outside Africa has been known for a long time. (fao.org)
  • environments
  • In environments with high ambient dust levels, it is beneficial to utilize a filter system that has double filtration. (wikipedia.org)
  • ASTRONOMY
  • Astronomy & Astrophysics, Volume 574, id.A123, 13 pp. (2015) Dust measurements in the coma of comet 67P/Churyumov-Gerasimenko inbound to the Sun. Rotundi et al. (wikipedia.org)
  • significant
  • Control of road dust is a significant challenge in urban areas, and also in other locations with high levels of vehicular traffic upon unsealed roads, such as mines and landfill dumps. (wikipedia.org)
  • The process adds oils and fillers to the material, as well as creating significant quantities of dust. (wikipedia.org)
  • Area
  • By using a matrix of nozzles, fog is sprayed into the area and settles the dust. (processindustryinformer.com)
  • Although negative pressure might seem to draw an adequate amount of air through the affected area to prevent a buildup of dust and fumes, fluctuations in process conditions, operation anomalies, and environmental conditions when the plant is not operational can all lead to contamination and/or damage to instruments. (wikipedia.org)
  • These forces move the dust to an area where the forces exerted by the gas stream are minimal. (wikipedia.org)
  • amount
  • The invaders departed after pilfering a large amount of resources, but the attack had weakened some of Moria's defenses and destroyed a number of military and manufacturing facilities. (battle.net)
  • The total amount of dust visible in the disk is estimated to be at least a lunar mass, while the larger planetesimals from which the dust is produced are inferred to have at least six lunar masses. (wikipedia.org)
  • tunnel
  • Kate and Ryan flee deeper into the mine, eventually losing the 'droid by jumping over a large chasm blocking the tunnel. (wikipedia.org)
  • Main
  • His main research field is the observational study and theoretical modelling of the dust environment in comets. (wikipedia.org)
  • From an early stage, the main theory pursued was that of the dust explosion. (wikipedia.org)
  • High
  • dust mass suggests that supernovae can be an important source of dust in the interstellar medium, from local to high-redshift galaxies. (osti.gov)
  • disk
  • Behavior of dusts and evolution of the protosolar disk are responsible for composition of planetesimals, which further affects the composition of planets. (uni-muenchen.de)
  • The disk has a gas to dust mass ratio of no more than 6:1, much lower than the usually assumed primordial value of 100:1. (wikipedia.org)
  • The inner structure has been compared with that expected to be seen if the disk is influenced by larger bodies or has undergone recent planet formation. (wikipedia.org)
  • In October 2015 it was reported that astronomers using the Very Large Telescope (VLT) had detected very unusual outward-moving features in the disk. (wikipedia.org)
  • The influence of the monomer shape in the first stage of dust growth in the protoplanetary disk. (wikipedia.org)
  • volume
  • A single-chamber cyclone separator of the same volume is more economical, but doesn't remove as much dust. (wikipedia.org)
  • second
  • However, this second MSDS neglected to mention the hazard posed by dust, as it was not thought to be hazardous once the slurry had dried. (wikipedia.org)
  • MASS
  • Our Herschel spectra show only weak CO line emission, and provide an upper limit for the 63 μm [O I] line flux, eliminating the possibility that line contaminations distort the previously estimated dust mass. (osti.gov)
  • The far-infrared emission can be fitted by 0.5 ± 0.1 M {sub ☉} of amorphous carbon, about a factor of two larger than the current nucleosynthetic mass prediction for carbon. (osti.gov)
  • understood
  • The Poynting-Robertson drag can be understood as an effective force opposite the direction of the dust grain's orbital motion, leading to a drop in the grain's angular momentum. (wikipedia.org)
  • Although
  • Although physical behavior of dusts have been extensively studied, the relationship between physics and chemistry has been scarcely stidied yet. (uni-muenchen.de)
  • construction
  • In addition, the site was close to Cincinnati's large labor force, the landscape was level making the site's construction easy, it was isolated, which provided safety and security, and it was located 30 to 50 feet above a large water aquifer, which supplied the water needed for uranium metal processing. (wikipedia.org)
  • scale
  • It's great for users who want to create large scale fluid simulations without having to leave Maya's interface for a third-party tool. (pluralsight.com)
  • In 1948 the Atomic Energy Commission, predecessor to the U.S. Department of Energy, established "a large scale integrated facility for the production of fabricated uranium fuel cores by chemical and metallurgical techniques. (wikipedia.org)
  • There are yet no plans for building space colonies by any large-scale organization, either government or private. (wikipedia.org)
  • small
  • They record large differences in chemical composition, moderate differences in O-isotopic composition, and small but well-resolved differences in the isotopic compositions of many other elements. (uni-muenchen.de)