Catastrophic impact

For some asteroids, near-catastrophic impacts played an important role in their early geological evolution. Impact events ranging from local melting of the target area to complete disruption of the parent body are recorded in most groups of meteorites (Keil et al., 1994). Major impacts in the early solar system caused remixing of metal and silicate and large-scale redistribution of cold and hot material in the interior of some of the parent bodies. These processes had profound... 

C.S. Cockell, A.R. Blaustein (2000). Ultraviolet spring and the ecological consequences of catastrophic impacts. Ecol. Lett., 3, 77-81. 

Considering the roadway itself and the catastrophic impact, the influencing factors on human walking speed can be seen as a corresponding coefficient to calculate the equivalent length of the lanes when solving the best relief route (Li G 2000, Fu E J Tang A D 2006, Li S L et al. 1999),... 

Are there documents that provide comprehensive analysis of all potential safety and health hazards of the worksite Are there documents that provide both the analysis of potential safety and health hazards for each new facility, equipment, material, or process and the means for eliminating or controlling snch hazards Does documentation exist outlining the step-by-step analysis of hazards in each part of each job, so that yon can clearly discern the evolution of decisions on safe work procedures If complicated processes exist, with a potential for catastrophic impact from an accident but low probability of such accident (as in nnclear power or chemical production), are there documents analyzing the potential hazards in each part of the process and the means to prevent or control them If there are processes with a potential for catastrophic impact from an accident but low probability of an accident, have analyses such as fault tree or what if been documented to ensure sufficient backup systems for worker protection in the event of multiple control failures ... 

The third stage consists of a vapor recovery reactor (VRR), where Al and AI2O vapors react with C to form AI4C3 (unless gas Al species are recovered countercurrent to the incoming solid feed, metal loss has a catastrophic impact on the process economics). 

Both of these react with atmospheric components to form sulfuric and nitric acids. When these acids rain out, they drop the pH of natural waters which can have significant, even catastrophic impacts on the ecosystem. However, acid precipitation can occur from other natural sources and the question arises as to what the pH of a body of water such as a lake was 10,20,100, or 10,000 years ago. Near-IR spectroscopy applied to lake sediment cores has been proposed as one method of doing so. 

Astrophysics does not Include the planet Earth in its domain of inquiry and I exclude it from consideration other than to note that the study of planetary and satellite atmospheres whose histories have not been modified by biological processes provides Important Insights into their significance in the evolution of the terrestrial atmosphere and Into the potentially catastrophic Impact of human activities. 

Tables 6.1 and 6.2 fist pertinent major incidents in the process industry that have had a dramatic effea on the management and regulation of the industry. As a result of the catastrophic impact these incidents had on industry, government, and environment, their subsequent investigations revealed that significant changes were required in the safety management of facihties in order to address major safety deficiencies.

If complicated processes exist, with a potential for catastrophic impact from an accident but low probability of such accident (as in nuclear power or chemical production), are there documents analyzing the potential hazards in each part of the processes and the means to prevent or control them ... 

Numerous asteroids and smaller debris also exist outside the belt, that is at distances greater than 3.2 AU as well as smaller than 2.2 AU. In particular, the Apollo, Amor, and Atem groups of asteroids are of concern because their orbits cross, or come close to, that of Earth. Smaller objects, less than a few kilometers in diameter, are difficult to detect from Earth, but a collision with one of them could have catastrophic consequences, even if it had a diameter of only a few hundred meters. In 1995, an asteroid about 5 km in length passed between Earth and the Moon it was not detected until days later. It is believed that a large asteroid impacted Earth 65 million years ago and was responsible for the extinction of the dinosaurs and many other species. It is quite possible that a similar event may have caused an even more devastating extinction of many forms of life nearly 250 million years ago (Ward et al, 2000). The possibility that catastrophic impacts may occur again cannot be ruled out (Gehrels, 1994). 

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