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Mostrar mensagens com a etiqueta Technology. Mostrar todas as mensagens
Mostrar mensagens com a etiqueta Technology. Mostrar todas as mensagens
SHOCKING | UFO ABDUCTS BOVINE |
We are still investigating this case controversial.
There are such cases in humans, but can not be exposed in public.
Space Shuttle Columbia Destroyed
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| IN MEMORY The crew of STS-107. L to R: Brown,Husband, Clark, Chawla, Anderson, McCool,Ramon |
The Space Shuttle Columbia disaster occurred on February 1, 2003, when shortly before it was scheduled to conclude its 28th mission, STS-107, the Space Shuttle Columbia disintegrated over Texas and Louisiana during re-entry into the Earth's atmosphere, resulting in the death of all seven crew members. Debris from Columbia fell to Earth in Texas. A debris field has been mapped along a path stretching from south of Fort Worth to Hempill, Texas, as well as into parts of Louisiana.
The loss of Columbia was a result of damage sustained during launch when a piece of foam insulation the size of a small briefcase broke off from theSpace Shuttle external tank (the 'ET' main propellant tank) under the aerodynamic forces of launch. The debris struck the leading edge of the left wing, damaging the Shuttle's thermal protection system (TPS), which shields the vehicle from the intense heat generated from atmospheric compression during re-entry. While Columbia was still in orbit, some engineers suspected damage, but NASA managers limited the investigation, under the rationale that the Columbia crew could not have fixed the problem. The Columbia Accident Investigation Board (CAIB) later concluded that a rescue mission using Atlantis may have been possible.
NASA's original shuttle design specifications stated that the external tank was not to shed foam or other debris; therefore, strikes upon the vehicle were safety issues that needed to be resolved before a launch was cleared. Launches were often given the go-ahead as engineers came to see the foam shedding and debris strikes as inevitable and unresolvable, with the rationale that they were either not a threat to safety, or an acceptable risk. The majority of shuttle launches recorded such foam strikes and thermal tile scarring. On STS-112, two launches before, a chunk of foam broke away from the ET bipod ramp and hit the SRB-ET Attach Ring near the bottom of the left solid rocket booster (SRB) causing a dent four inches wide and three inches deep in it. After that mission, the situation was analyzed and NASA decided to press ahead under the justification that "The ET is safe to fly with no new concerns (and no added risk)" of further foam strikes, justification that was revisited while Columbia was still in orbit and Chair of the Mission Management Team (MMT) Linda Ham re-assessed, stating that the “Rationale was lousy then and still is”. Ham as well as Shuttle Program Manager Ron Dittemore had both been present at the October 31, 2002, meeting where this decision to continue with launches was made.
During re-entry of STS-107, the damaged area allowed hot gases to penetrate and destroy the internal wing structure, rapidly causing the in-flight breakup of the vehicle. An extensive ground search in parts of Texas, Louisiana, and Arkansas recovered crew remains and many vehicle fragments.
Mission STS-107 was the 113th Space Shuttle launch. The mission was delayed 18 times over the two years from the planned launch date of January 11, 2001, to the actual launch date of January 16, 2003. (It was preceded by STS-113.) A launch delay due to cracks in the shuttle's propellant distribution system occurred one month before a July 19, 2002, launch date. The Columbia Accident Investigation Board determined that this delay had nothing to do with the catastrophic failure six months later.
The Columbia Accident Investigation Board's recommendations addressed both technical and organizational issues. Space Shuttle flight operations were delayed for over two years, similar to the delay following the Challenger accident. Construction of the International Space Station was put on hold, and for 29 months the station relied entirely on the Russian Federal Space Agency for resupply until Shuttle flights resumed with STS-114 and 41 months for crew rotation until STS-121. Major changes to shuttle operations, after missions resumed, included a thorough on-orbit inspection to determine how well the shuttle's thermal protection system had endured the ascent, and keeping a designated rescue mission at the ready in case irreparable damage was found. Also it had been decided that all missions would be flown only to the ISS so that the crew could use that spacecraft as a "safe haven" if need be. Later NASA decided it would be an acceptable risk to make one exception to that policy for one final mission to repair the Hubble Space Telescope in its high-altitude low-inclination orbit.
 STS-107 flight insignia | |
| Date | 1 February 2003 |
|---|---|
| Time | 08:59 EST (13:59 UTC) |
| Location | Over Texas and Louisiana |
| Outcome | Grounding of the Space Shuttle fleet for over two years during which various safety measures, improvement in crew restraint, effective ways to deal with catastrophic cabin depressurization and an automated parachute system were initiated. |
| Casualties | |
| Rick D. Husband William C. McCool Michael P. Anderson Kalpana Chawla David M. Brown Laurel Clark Ilan Ramon | |
| Inquiries | Columbia Accident Investigation Board |
New Technology of Tires
New Technology of Tires
In everyday driving scenarios, your tires are among the 3 or 4 most important safety features your vehicle has. Looking at them as a safety feature may seem a little bit of a stretch, but when it comes right down to it they are the only contact between yourself and the pavement. If you move out of the everyday and go to a combat zone, tires could mean the difference between life and death. For this reason, a new kind of tire has been developed for the US Military that could help bring more of our men and women home.
The research and development was conducted by Resilient Technologies and Wisconsin-Madison's Polymer Engineering Center and brought about an open sided tire with a Honeycomb interior structure. The design is similar to the Michelin "Tweel" that was developed a few years ago as part of a study on airless tires and their feasibility.
After the study concluded, developers decided the honeycomb was still the best suited for the job, as the construction will provide a very balanced load distribution for the heavy vehicles it is intended for, while also providing very efficient way to remove heat.
Currently, most of the vehicles are using run-flat tires that were not made to carry the additional weight of armor. If an IED is used to disable the vehicle, the run-flats may not provide enough support for the vehicle, leaving troops without a means of escape.
The new honeycomb design does not rely on a run-flat system, therefore almost completely reducing the risk of being immobilized during an attack. The design also keeps road noise and vibration to a minimum and closely mimics the behavior of tradition air filled tires.
Production and delivery is set to start in 2011, with prices competitive to, if not less than tires that are currently available. Whether the technology will cross over into the civilian market is unknown, but if the past predicts the future there is a very good chance we will see them on everyday vehicles within the next 10 years.
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