... Clean out all abrasives and dust from the abrasive blast pot, taking care not to disturb air or abrasive feed rate settings. ...

... use of open-abrasive blasting for preparing surfaces for painting. This will necessitate the increased use of recyclable abrasives, dust containment ...

University of Colorado at Boulder, Boulder, Colorado. Three-Body Abrasion Testing Using Lunar Dust. Simulants to Evaluate Surface System Materials ...

May 21, 2009 ... Abrasive Effects of Lunar Dust, JSC Simulants, and Sandpapers on Skin and Acrylic Samples, Measured by Electrical Resistance and Confocal ...

Research was performed to evaluate pollution control measures for bridge painting. A field comparison was performed to evaluate the following techniques: abrasive blasting with low dusting abrasive; abrasive blasting with metallic abrasive; vacuum blastin...

... of dust extend beyond mechanical irritancy and potential for abrasions and potential for chemical reactivity and corrosive effects are substantiated. ...

May 31, 2011 ... TITLE AND SUBTITLE: Defining an Abrasion Index for Lunar Surface Systems as a Function of Dust Interaction Modes and Variable Concentration ...

... 8 3 Calculated Particle Velocity 10 4 Removal uf MLrial by an Abrasive Particlu 1 5 Predicted Volume Removal by a Single Abrasive Particle 14 ...

The production process of abrasives use aluminium, or silicon carbide a synthetic material with a hardness only slightly less than that of a diamond. It is popularly known as carborundum since it was first manufactured as an abrasive in 1891, produced by ...

Oct 31, 2008 ... Abrasion of the fabric of the extravehicular activity (EVA) suits was much ... sufficiently to wear through the outer suit layer in several spots" (ref. 3). ... The fixture was adapted from a standard abrasion test (ref. ...

Numerous unexpected operational issues relating to the abrasive nature of lunar dust, such as scratched visors and spacesuit pressure seal leaks, were encountered during the Apollo missions. To avoid reoccurrence of these unexpected detrimental equipment ...

Future astronauts exploring the Moon will need to consider the biological effects of lunar dust, including potential inhalation toxicity, ocular effects and skin effects. This paper will focus on skin abrasivity.

...presence of tears, holes, and abrasions in filter bags and for dust deposits on the clean side of bags. For air cleaning devices...presence of any tears, holes, and abrasions. (iv) Presence of dust deposits on clean side of fabric filters. (v) Brief...

...than opening the device, the presence of tears, holes, and abrasions in filter bags and for dust deposits on the clean side of...fabric filters, including presence of any tears, holes, and abrasions. (iv) Presence of dust deposits on clean side of...

These unusual properties may cause the respirable dusts to be at least moderately toxic to the respiratory system, and larger grains to be abrasive to the ...

Photovoltaic (PV) coverslip material was subjected to Martian dust storm conditions using basaltic dust flowing through the Martian Surface Wind Tunnel at NASA Ames. Initially dusted and clear coverslips were held at angles from 0 to 90 deg., and the dust laden wind velocity was varied from 20 to 97 m/s. Blowing ...

Lunar dust is pervasive, and requirements for dust protection will affect both hardware design and operations planning for lunar surface systems. On Earth, mechanical problems caused by particulates include erosive and abrasive effects, clogging of mechan...

Fine-grained lunar dust is abrasive and led to problems during Apollo. To prevent similar issues, dust physical properties and induced motion forces must be characterized and accounted for in the design and operations of spacecraft and spacesuits.

Jul 21, 2006 ... During recent soil-brushing experiments, the rock abrasion tool on NASA's Mars Exploration Rover Spirit became covered with dust, ...

Nov 24, 2008 ... SUBTOPIC TITLE: Surface System Dust Mitigation. PROPOSAL TITLE: Multi-Use Coating for Abrasion Prevention, Wear Protection, and Lunar ...

... desiccation. Beamont (1945) and Wigglesworth (1945) demonstrated that abrasive dusts disrupt the wax covering and cause rapid ... of drywood termites (Kalotermitidae) treated with alumina (an abrasive) an...

AIAA20070963. (NASA/TM2007-214704), 2007. http://gltrs.grc.nasa.gov. 5. Standard Guide for Abrasion Resis- tance of Textile Fabrics (Rotary Platform ...

... Diatomaceous earth (DE) is usually regarded as an abrasive that scratches the cuticular surface, and Dri-die ( ... increasing contact with diatomaceous earth and Dri-die (abrasive versus sorptive, respecti...

A request was received from the International Chemical Workers Union to investigate respiratory symptoms occurring from possible exposure to silica dust along with neurologic symptoms of memory loss and disorientation from possible exposure to aluminum-oxide dust at the Sancap Abrasives, Inc. facility in Alliance, Ohio. Sancap ...

Tests were carried out to assess the impact of wind blown dust accumulation and abrasion on radiator surfaces on Mars. High emittance arc-textured copper and niobium-1 percent-zirconium samples were subjected to basaltic dust laden wind at Martian pressure (1000 Pa) at speeds varying from 19 to 97 m/s in the Martian Surface Wind ...

Aug 7, 2006 ... An abundance of iron oxide minerals in Martian dust have given Spirit's robotic arm and rock abrasion tool a reddish-brown veneer. ...

May 22, 2009 ... Lunar dust with abrasive surfaces, reactive surface charges and iron content is expected to affect biological systems. ...

... Title : Mineralogy of Selected World Soil Samples, with Implications Regarding the Abrasion/Corrosion Potential of Environmental Dust on Military ...

Crew-worn systems/components of Apollo spacesuits were studied to determine contamination, abrasion,

Reactivity: Simulation and Characterization. NASA/CR2008-215431 ... Constellation systems will be affected by its adhesion, abrasion, and reactivity . ...

Aug 30, 2008... situ calorimetry; High intensity solar simulator; 30 K cold box; Thermal characterization mode; Fabric abrasion mode; Rotation wear mode ...

unusual properties may cause the respirable dusts to be at least moderately toxic to the respiratory system, and larger grains to be abrasive to the skin ...

... Administrative Instructions, Directive-Type Memorandums and ... pollution from abrasive dust clouds. ... several differ different types and manufacturers ...

Wind resuspension (or entrainment) provides a source of dust and contaminants for the atmosphere. Conventional wind erosion models parameterize dust resuspension flux with a threshold velocity or with a horizontal abrasion flux; in the absence of abrasion the models assume dust flux is ...

During the Apollo era, astronauts exploring the Moon experienced numerous unexpected material wear issues that were attributed to the presence of fine-grained lunar dust. These jagged, irregularly shaped dust particles are created by constant micrometeorite bombardment and retain their abrasive properties due to lack of weathering in ...

A demonstration was performed for decontaminating a radioactivity contaminated concrete pad with a portable abrasive blasting system. The system utilizes a rotating blast wheel that scours the concrete surface with metal abrasive. The metal abrasive, pulverized concrete dust, and contaminants rebound into a ...

Due to the uniquely harsh lunar surface environment, terrestrial test activities may not adequately represent abrasive wear by lunar dust likely to be experienced in mechanical systems used in lunar exploration. Testing to identify potential moving mechan...

The recommended Guideline is issued as a supplement to the Final Report for Research Project 86-23 'Pollution Controls for Bridge Painting.' The objective of the research project was to evaluate various surface preparation methods for their effect on air, water, soil and sediment as well as their technical suitability for use on bridges. The methods evaluated were: open ...

Research was performed to evaluate pollution control measures for bridge painting. A field comparison was performed to evaluate the following techniques: abrasive blasting with low dusting abrasive; abrasive blasting with metallic abrasive; vacuum blasting with recyclable ...

Lung tissue of a worker in an abrasive manufacturing plant, whose duration of dust exposure was about 10 years, was analyzed by means of bulk analysis and in situ analytical electron microanalysis. The content of the total dust in the lung was 120 mg/g of the dried lung tissue. This value is close to the average concentration of the ...

In this work it is presented an evaluation on the degree of contamination by emery dust in a working area where abrasives are manufactured, in a factory located in the industrial area of Toluca City by neutron activation analysis and atomic absorption spe...

An artificial mineral of the approximate elemental composition of Martian soil was manufactured, crushed, and sorted into four different size ranges. Dust particles from three of these size ranges were applied to arc-textured Nb-1 percent Zr and Cu radiator surfaces to assess their effect on radiator performance. Particles larger than 75 microns did not have sufficient ...

Authors consider the environmental prospects of using melted waste slag as the aggregate for asphalt pavement. In particular, the enrichment of slag-derived fragments in fine abrasion dust particles originated from slag asphalt concrete and its size dependency were concerned. A series of surface abrasion tests for asphalt concrete ...

Spent abrasive media from bridge repainting operations contain metals which may result in the media being classified as hazardous under the Environmental Protection Agency (EPA) Toxicity Characteristic (TC) criteria. The management of spent abrasive media by recycling it as a component of nonstructural concrete was investigated. Success was measured with ...

The characteristics of recovery of coke dust are due to the relatively large size of the particles and their highly abrasive nature. The use of wet dust traps is not feasible due to the difficulties arising from the necessity of treating the sludge water. It is feasible to use dry methods of purifying the aspiration air. As ...

The purpose of this work was to investigate abrasive blasting as a method for decontamination of radioactive Process Refabrication Experiment (PRE) in-cell equipment. Experiments were carried out, initially with nonradioactive materials, and then with low-level radioactive materials to determine the proper operating conditions and effectiveness of ...

This study was designed to document the effect that wet abrasive blasting has on reducing worker exposure to crystalline silica, which has been associated with silicosis and premature death. In this study, worker exposure to respirable crystalline silica was monitored during wet abrasive blasting on the exterior walls of a parking garage to remove surface ...

Fifty-four representative soil samples from all over the world were selected for heavy mineral analysis from those provided by the Naval Weapons Center, China Lake, California. Data thus obtained, in conjuction with mineralogical, chemical, and abrasion i...

Given models for both ambipolar and surface plasma processes, we consider the ... or dust, behave like abrasive Velcro, coating surfaces, clogging mechanisms, .... Air masses associated with stratosphere-troposphere exchange are present ...

Dec 1, 2009 ... NASA's Mars Exploration Rover Opportunity used the wire brush of its rock abrasion tool to scour dust from a circular target area on a rock ...

Silicosis is a disabling and often fatal lung disease caused by breathing dust that has very small pieces of crystalline silica in it. Crystalline silica is found in concrete, masonry, sandstone, rock, paint, and other abrasives. The cutting, breaking, cr...

A desperate need exists in shipyards for the proper planning and execution of surface preparation and coating operations in tanks and other enclosed areas. Abrasive blasters and painters are exposed to high concentrations of dust and hazardous organic vap...

Rock Abrasion Tool (RAT) to penetrate thro' rock dust '. A 1 U ELECTROCHEMICAL TECHNOLOGIES ... SAFT D-Size Lithium-Ion Cells 30% DOD LEO Cycling (23�C) ...

Optical evaluations of lenses considered as candidates to replace the visor in the combat vehicle crewman's protective goggles are described. The four areas of optical evaluation were: spectral transmission, haze, optical distortion, and abrasion resistan...

... front of your eye. Contact with dust, dirt, sand, wood shavings, metal particles or even an edge ... is scratched, you might feel like you have sand in your eye. Tears, blurred vision, increased sensitivity ...

Lead-based paint is no longer used in the field, but repair crews, nearby communities, and the environment may be exposed to unacceptable levels of lead as older steel structures are abrasive-blasted before repainting. Onsite dust-containment enclosures u...

...and sealants. (8) The manufacture of plastics and rubber materials. (9) The manufacture...of tears, holes, and abrasions in filter bags and for dust deposits on the clean side of bags. For air cleaning devices that cannot...

The abrasion of equipment caused by the throughput of large volumes of solids or dust is a major problem in mining, handling and processing minerals such as coal and limestone, and in the disposal of waste products such as ash. Loss of material from the surfaces over which these materials pass is caused by the combined effects of impact ...

The LTC 1073 Vacuum Blasting Machine uses a high capacity, direct pressure blasting system incorporating a continuous feed for the blast media. The blast media cleans the surface within the contained brush area of the blast head. A vacuum system removes dust and debris from the surfaces as it is blasted. After cleaning the surface, the abrasive, together ...

Aeolian activity was predicted for Mars from earth based observations of changing surface patterns that were interpreted as dust storms. Mariner 9 images showed conclusive evidence for aeolian processes in the form of active dust storms and various aeolian landforms including dunes and yardangs. Windspeeds to initiate particle movement are an order of ...

The effect of atmospheric dust particles on the reflectance of solar-installation mirrors with front and rear reflection is investigated as a function of particle time, speed, dimensions, and angle of attack. It is shown that the atmospheric dust borne in the air and transported by the mountain-valley circulation winds characteristic of Central Asia ...

Inhalation of silica dust is associated with pulmonary fibrosis. Therefore, substitute abrasive materials have been suggested for use in abrasive blasting operations. To date, toxicological evaluation of most substitute abrasives has been incomplete. Therefore, the objective of this study was to compare the ...

The results of the long-term monitoring of airborne particulate matter (APM) in Tokyo indicated that APM have been extremely enriched with antimony (Sb) compared to crustal composition. This observation suggests that the airborne Sb is distinctly derived from human activities. According to the material flow analysis, automotive brake abrasion dust and fly ...

The Glassification process is a unique system that treats hazardous materials such as electric arc furnace dust, slag, spent refractories, etc, and produces an inert, nontoxic marketable commodity. A wide variety of end products include: colored glasses; glass-ceramics that resemble natural rocks used for architectural purposes and decorative articles; roofing granules; ...

space suit fabric that has better resistance to abrasion by lunar dust. ... which lunar dust will degrade the performance of thermal control surfaces. ... (Northfield, MN) from 12.7 �m (5 mil) thick FEP Teflon which was coated with a few tens of nm ...

Particle emissions of road traffic are generally associated with fresh exhaust emissions only. However, recent studies identified a clear contribution of non-exhaust emissions to the PM10 load of the ambient air. These emissions consist of particles produced by abrasion from brakes, road wear, tire wear, as well as resuspension of deposited road dust. For ...

In order to fulfil the EU-limitations of fine dust and traffic-produced gases Cologne installed 2008 one of the first German environmental zones, from which stepwise vehicles with too high emissions will be locked out. Verification of effectiveness and the research on further strategies to reduce fine dust are studied as promising applications of a method ...

The basic objective of this project was to determine the cost-effectiveness of dust controls used on unpaved haul roads. The major technical questions are: 1. What control methods (different chemicals and water) are suitable for dust control of unpaved mine roads. 2. How does control effectiveness vary over time, by application method (mixed in place or ...

Two standard methods for the characterization of the abrasion nanoparticle release into air and liquid from coatings containing nanoparticles were developed. Details of the abrasion processes and the measurement methods are shown. Paints were formulated in an industrial facility. Standard abrasion conditions in wet environments were ...