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Comparative efficacy of irrigation activation systems in root canal cleanliness: a region-specific analysis of debris and smear layer removal. [PDF]
Lasers Med SciTu Y, Wang Y, Sun G, Xiao S, Li Y, Wu L.
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The painted fieldnote: A method for contending with teaching, research, and place. [PDF]
Multimodality SocLeRue D.
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Influence of kinematic motion and instrumentation strategy on apical debris extrusion during root canal preparation: An <i>in vitro</i> study. [PDF]
J Conserv Dent EndodAlghazaly A +3 more
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Launch Traffic Model for Space Debris Evolution Based on Historical Data and Economic Forecasting Methods [PDF]
Retagne, W. M. +2 more
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Physics Today, 2007
Controlling the production of debris is crucial to the sustainable use of space. But even without additional launches, let alone antisatellite tests, the amount of debris orbiting Earth will continue to increase far into the future.
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Controlling the production of debris is crucial to the sustainable use of space. But even without additional launches, let alone antisatellite tests, the amount of debris orbiting Earth will continue to increase far into the future.
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2019
The paper focuses on the dynamics of space debris in the Earth environment, with a celestial mechanics and theoretical point of view, and not with an operational perspective. The introduction describes the Earth space junk, with the description and the evolution of the debris population, and lists the main forces acting on them, their relative ...
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The paper focuses on the dynamics of space debris in the Earth environment, with a celestial mechanics and theoretical point of view, and not with an operational perspective. The introduction describes the Earth space junk, with the description and the evolution of the debris population, and lists the main forces acting on them, their relative ...
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Space debris and the battle for space
UN Chronicle, 2012On 10 February 2009, a decommissioned Cosmos 2251 satellite and an operational Iridium 33 satellite collided at an altitude of 790 km in low Earth orbit (leo), a zone heavily populated by communications satellites. The collision created two distinct clouds of more than 800 pieces of space debrisman-made objects in orbit that no longer serve a ...
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The space debris around the earth.
Science progress, 2000When in October 1957 the first artificial satellite, Sputnik 1, was launched by the USSR, nobody could imagine that after less than 50 years we would be facing an environmental problem in the near- Earth space. A few years later, on 29 June 196l anotherkey event happened, even if less resoundingfrom the political and scientific point of view, that ...
Rossi A, Valsecchi GB
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