Matches in DBpedia 2016-04 for { <http://wikidata.dbpedia.org/resource/Q16001927> ?p ?o }
Showing triples 1 to 43 of
43
with 100 triples per page.
- Q16001927 subject Q8784734.
- Q16001927 abstract ""The toxicological effects of lunar dusts have not been studied in sufficient depth to develop an exposure standard for operations on the lunar surface. Lunar dusts have a high content in the respirable size range, they have a high surface area that is chemically reactive, and elemental iron "nano-particles" are imbedded in the dust grains. 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 skin & eye. NASA needs to set an airborne exposure standard based on scientific evidence so that vehicle designs can effectively control exposure." – Human Research Program Requirements Document, HRP-47052, Rev. C, dated Jan 2009.The respirable fraction of lunar dusts may be toxic to humans. NASA has therefore determined that an exposure standard is necessary to limit the amount of respirable airborne lunar dusts to which astronauts will be exposed. The nominal toxicity that is expected from ordinary mineral dust may be increased for lunar dusts due to the large and chemically reactive surfaces of the dust grains. Human exposures to mineral dusts during industrial operations and from volcanic eruptions give researchers some sense of the relative toxicity of lunar dust, although the Earth-based analogs have serious limitations. Animal and cellular studies provide further evidence that mineral dusts can be somewhat toxic. Earth-based research of mineral dust has shown that freshly fractured surfaces are chemically reactive and can elicit an increased toxic response. Since lunar dust is formed in space vacuum from highly energetic processes, the grain surfaces can be expected to be indefinitely reactive on the lunar surface. NASA predicts that this chemical reactivity will change once the dust is brought into a habitable environment.Dust from lunar soil that was carried into spacecraft during the Apollo missions proved to be a nuisance. The lack of gravity, or the existence of gravity at a small fraction of the gravitational force of the Earth, increases the time during which dust remains airborne, thereby increasing the probability that these dust particles will be inhaled. Lunar dust particles that are generated by impaction in a deep vacuum have complex shapes and highly reactive surfaces that are coated with a thin layer of vapor-deposited mineral phase. Airborne mineral dust in a variety of forms has been shown to present a serious health hazard to ground-based workers. The health hazards that are associated with volcanic ash, which is a commonly used analog of lunar dust, have not been reported to be especially serious; however, this type of ash quickly loses its reactive surfaces and is often aggregated into particles that are not readily respirable into the deep lung. Crew members who will be at a lunar outpost can be directly exposed to lunar dust in several ways. After crew members perform spacewalks or EVAs, they will introduce into the habitat a large quantity of dust that will have collected on spacesuits and boots. Cleaning of the suits between EVAs and changing of the Environmental Control Life Support System (ECLSS) filters are other operations that could result in direct exposure to lunar dusts. In addition, if the final spacesuit design is based on the current spacesuit design, EVAs may cause dermal injuries, and the introduction of lunar dusts into the suits' interior, which may enhance skin abrasions. When the crew leaves the lunar surface and returns to microgravity, the dust that is introduced into the crew return vehicle will "float," thus increasing the opportunity for ocular and respiratory injury.".
- Q16001927 thumbnail AS17-145-22157.png?width=300.
- Q16001927 wikiPageExternalLink space-dust-pictures.htm.
- Q16001927 wikiPageExternalLink 2122.pdf.
- Q16001927 wikiPageExternalLink Health-hazards-of-lunar-dust-.
- Q16001927 wikiPageExternalLink 2079-solving-settlement-problems-dealing-moon-dust.html.
- Q16001927 wikiPageWikiLink Q1037499.
- Q16001927 wikiPageWikiLink Q107099.
- Q16001927 wikiPageWikiLink Q11412.
- Q16001927 wikiPageWikiLink Q11475.
- Q16001927 wikiPageWikiLink Q11631.
- Q16001927 wikiPageWikiLink Q11942233.
- Q16001927 wikiPageWikiLink Q1324199.
- Q16001927 wikiPageWikiLink Q1648514.
- Q16001927 wikiPageWikiLink Q17068452.
- Q16001927 wikiPageWikiLink Q17070543.
- Q16001927 wikiPageWikiLink Q180046.
- Q16001927 wikiPageWikiLink Q182020.
- Q16001927 wikiPageWikiLink Q192372.
- Q16001927 wikiPageWikiLink Q193384.
- Q16001927 wikiPageWikiLink Q207.
- Q16001927 wikiPageWikiLink Q223571.
- Q16001927 wikiPageWikiLink Q23548.
- Q16001927 wikiPageWikiLink Q2708098.
- Q16001927 wikiPageWikiLink Q274160.
- Q16001927 wikiPageWikiLink Q367737.
- Q16001927 wikiPageWikiLink Q48655.
- Q16001927 wikiPageWikiLink Q540204.
- Q16001927 wikiPageWikiLink Q5937693.
- Q16001927 wikiPageWikiLink Q61231.
- Q16001927 wikiPageWikiLink Q6703840.
- Q16001927 wikiPageWikiLink Q677.
- Q16001927 wikiPageWikiLink Q6774744.
- Q16001927 wikiPageWikiLink Q7218.
- Q16001927 wikiPageWikiLink Q7692360.
- Q16001927 wikiPageWikiLink Q778774.
- Q16001927 wikiPageWikiLink Q7891.
- Q16001927 wikiPageWikiLink Q8784734.
- Q16001927 wikiPageWikiLink Q984134.
- Q16001927 comment ""The toxicological effects of lunar dusts have not been studied in sufficient depth to develop an exposure standard for operations on the lunar surface. Lunar dusts have a high content in the respirable size range, they have a high surface area that is chemically reactive, and elemental iron "nano-particles" are imbedded in the dust grains.".
- Q16001927 label "Adverse health effects from lunar dust exposure".
- Q16001927 depiction AS17-145-22157.png.