Saturday, August 5, 2017

Biography of Neil Armstrong-physicsknow

Biography of Neil Armstrong


Neil A. Armstrong, the first man to walk on the moon, was born in Wapakoneta, Ohio,




















August 5, 1930. He began his NASA career in Ohio.

After serving as a naval aviator from 1949 to 1952, Armstrong joined the National Advisory Committee for Aeronautics (NACA) in 1955. His first assignment was with the NACA Lewis Research Center (now NASA Glenn) in Cleveland. Over the next 17 years, he was an engineer, test pilot, astronaut and administrator for NACA and its successor agency, the National Aeronautics and Space Administration (NASA).

As a research pilot at NASA's Flight Research Center, Edwards, Calif., he was a project pilot on many pioneering high speed aircraft, including the well known, 4000-mph X-15. He has flown over 200 different models of aircraft, including jets, rockets, helicopters and gliders.

Armstrong transferred to astronaut status in 1962. He was assigned as command pilot for the Gemini 8 mission. Gemini 8 was launched on March 16, 1966, and Armstrong performed the first successful docking of two vehicles in space.


As spacecraft commander for Apollo 11, the first manned lunar landing mission, Armstrong gained the distinction of being the first man to land a craft on the moon and first to step on its surface.

Armstrong subsequently held the position of Deputy Associate Administrator for Aeronautics, NASA Headquarters, Washington, D.C. In this position, he was responsible for the coordination and management of overall NASA research and technology work related to aeronautics.

He was Professor of Aerospace Engineering at the University of Cincinnati between 1971-1979. During the years 1982-1992, Armstrong was chairman of Computing Technologies for Aviation, Inc., Charlottesville, Va.

He received a Bachelor of Science Degree in Aeronautical Engineering from Purdue University and a Master of Science in Aerospace Engineering from the University of Southern California. He holds honorary doctorates from a number of universities.

Armstrong was a Fellow of the Society of Experimental Test Pilots and the Royal Aeronautical Society; Honorary Fellow of the American Institute of Aeronautics and Astronautics, and the International Astronautics Federation.

He was a member of the National Academy of Engineering and the Academy of the Kingdom of Morocco. He served as a member of the National Commission on Space (1985-1986), as Vice-Chairman of the Presidential Commission on the Space Shuttle Challenger Accident (1986), and as Chairman of the Presidential Advisory Committee for the Peace Corps (1971-1973).

Armstrong was decorated by 17 countries. He was the recipient of many special honors, including the Presidential Medal of Freedom; the Congressional Gold Medal; the Congressional Space Medal of Honor; the Explorers Club Medal; the Robert H. Goddard Memorial Trophy; the NASA Distinguished Service Medal; the Harmon International Aviation Trophy; the Royal Geographic Society's Gold Medal; the Federation Aeronautique Internationale's Gold Space Medal; the American Astronautical Society Flight Achievement Award; the Robert J. Collier Trophy; the AIAA Astronautics Award; the Octave Chanute Award; and the John J. Montgomery Award.

Armstrong passed away on Aug. 25, 2012 following complications resulting from cardiovascular procedures. He was 82.

Sunday, July 16, 2017

physicsknow- Vacuum and Effects on humans and animals

physicsknow- Vacuum and Effects on humans and animals


Vacuum is space void of matter. The word stems from the Latin adjective vacuus for "vacant" or "void". An approximation to such vacuum is a region with a gaseous pressure much less than atmospheric pressure.Physicists often discuss ideal test results that would occur in a perfect vacuum, which they sometimes simply call "vacuum" or free space, and use the term partial vacuum to refer to an actual imperfect vacuum as one might have in a laboratory or in space. In engineering and applied physics on the other hand, vacuum refers to any space in which the pressure is lower than atmospheric pressure.The Latin term in vacuo is used to describe an object that is surrounded by a vacuum.

An_Experiment_on_a_Bird_in_an_Air_Pump_by_Joseph_Wright_of_Derby,_1768

An_Experiment_on_a_Bird_in_an_Air_Pump_by_Joseph_Wright_of_Derby,_1768
Humans and animals exposed to vacuum will lose consciousness after a few seconds and die of hypoxia within minutes, but the symptoms are not nearly as graphic as commonly depicted in media and popular culture. The reduction in pressure lowers the temperature at which blood and other body fluids boil, but the elastic pressure of blood vessels ensures that this boiling point remains above the internal body temperature of 37 °C. Although the blood will not boil, the formation of gas bubbles in bodily fluids at reduced pressures, known as ebullism, is still a concern. The gas may bloat the body to twice its normal size and slow circulation, but tissues are elastic and porous enough to prevent rupture. Swelling and ebullism can be restrained by containment in a flight suitShuttleastronauts wore a fitted elastic garment called the Crew Altitude Protection Suit (CAPS) which prevents ebullism at pressures as low as 2 kPa (15 Torr).Rapid boiling will cool the skin and create frost, particularly in the mouth, but this is not a significant hazard.


Animal experiments show that rapid and complete recovery is normal for exposures shorter than 90 seconds, while longer full-body exposures are fatal and resuscitation has never been successful. A study by NASA on eight chimpanzees found all of them survived two and a half minute exposures to vacuum. There is only a limited amount of data available from human accidents, but it is consistent with animal data. Limbs may be exposed for much longer if breathing is not impaired.Robert Boyle was the first to show in 1660 that vacuum is lethal to small animals.

An experiment indicates that plants are able to survive in a low pressure environment (1.5 kPa) for about 30 minutes.

Monday, July 10, 2017

Eva Ekeblad-First woman in the Royal Swedish Academy of Sciences-physicsknow

Evadelagardie.gif
Eva Ekeblad

Eva Ekeblad

Eva Ekeblad
BornJuly 10, 1724
Stockholm, Sweden
DiedMay 15, 1786 (1786-05-16) (aged 61)
Skaraborg County, Sweden
ResidenceStockholm and Västergötland
CitizenshipSwedish
FieldsAgronomy
Known forMaking alcohol of potatoes (1746)
InfluencedReduced hunger by making potatoes a basic food.
Notable awardsMembership in the Royal Swedish Academy of Sciences (1748)
Notes
First woman in the Royal Swedish Academy of Sciences: full member 1748–51, honorary member 1751-86.

Saturday, July 8, 2017

India planted 66 million trees in 12 hours to make India green again- physicsknow

India promised to increase forest cover to 95 million hectares by 2030

 


Thursday, July 6, 2017

Astronomy Highlights in Summer 2017- physicsknow

you can also follow on twitter for physics knowing @physicsknow
https://twitter.com/physicsknow/status/882854732183851008

Saturday, July 1, 2017

The Unsung Heroes of Science - physicsknow

The Unsung Heroes of Science-physicsknow

Some scientists never got the praise they deserved. Here's to the ones history passed over.

1. Alhazen: Method Man

Alhazen: Method Man

 Observe. Hypothesize. Experiment. Revise. Repeat. The scientific method is the foundation upon which researchers build. The man who laid the groundwork for it, however, is all but forgotten in the West.
Born in the mid-10th century in what is now Iraq, Ibn al-Haytham, known to English speakers as Alhazen, was a man of endless curiosity. At a time when the Arabic-speaking world was the epicenter of scientific inquiry, Alhazen was one of its brightest stars.
He wrote more than 100 books on physics, mathematics and astronomy, among other fields, and is believed to be the first to explain how our brains create the illusion of the moon appearing larger near the horizon. His pioneering work on optics inspired the likes of Roger Bacon and Johannes Kepler centuries later. But Alhazen’s creation of the scientific method is his most far-reaching achievement.
Known for developing theories based on experimentation and data collection rather than abstract thought, Alhazen stressed the need to test results — especially those considered canon, as he wrote in his Doubts Against Ptolemy:
“A person who studies scientific books with a view of knowing the real facts ought to turn himself into an opponent of everything that he studies; he should thoroughly assess its main as well as its margin parts, and oppose it from every point of view and in all its aspects.. . . If he takes this course, the real facts will be revealed to him.”
Alhazen’s advice can be seen in action today around the world, from middle school science fairs to the Large Hadron Collider.

Saturday, May 20, 2017

ISRO to launch 3 satellites in 18 months for high-speed internet-physicsknow

ISRO to launch 3 satellites in 18 months for high-speed internet: GSAT-19 launch in June

The GSAT-19 satellite is scheduled to take off in early June onboard GSLV-Mk III, ISRO's heaviest rocket, from SDSC SHAR, Sriharikota. 

 Space Research Organisation (ISRO)  -physicsknowNew Delhi: The Indian Space Research Organisation (ISRO) will send a series of three communication satellites - GSAT-19, GSAT-11 and GSAT-20 – into the orbit in the next 18 months to increase internet speed across the nation, as per a report in Indian Express.


The GSAT satellites are India's indigenously developed technologies of communications satellites, with an objective to make the country self-reliant in broadcasting services.
The GSAT-19 satellite is scheduled to take off in early June onboard GSLV-Mk III, ISRO's heaviest rocket, from SDSC SHAR, Sriharikota.
This would be the maiden flight for GSLV-Mk III, the next generation launch vehicle of ISRO capable of launching 4 ton class of satellites to Geosynchronous Transfer orbit (GTO).
“The next big launch will be GSAT-19 in June. With this launch, we will begin a new age of communication satellites. It is also the beginning of high-throughput satellites (in India),” Tapan Misra, director of Ahmedabad-based Space Applications Centre (SAC), an arm of ISRO that develops satellite payloads, was quoted as saying by the Indian Express.
“While the world is already witnessing a change in the communication technology where voice and video communications are taking place through Internet, with future launches, television will be viewed through Internet using wireless Technology,” Misra added.
These launches will not only revolutionise the way we use televisions and smart-phones, but will also drive the future communication needs of smart cities, the report added.
ISRO said the satellite will carry Ka-band and Ku-band payload along with a Geostationary Radiation Spectrometer (GRASP) payload to monitor and study the nature of the charged particles and influence of space radiation on spacecraft and electronic components.
GSAT-19 satellite will employ advanced spacecraft technologies including bus subsystem, indigenous Li ion battery, indigenous Bus bars for power distribution, etc, the Indian space agency added.
Earlier this month on the 5th May, ISRO successfully launched the Geostationary communication satellite-9 (GSAT-9) – India's gift to South Asia - into a Geostationary orbit.
The GSAT-9 is meant for providing communication and disaster support and connectivity among the countries of South Asia region, with the mission life of about 12 years.