Showing posts with label Science. Show all posts
Showing posts with label Science. Show all posts

Wednesday, December 25, 2013

Earth's revolution and the yugas

Myth: Earth returns to its starting position when it completes one revolution around the sun

Truth: There is a small displacement that happens during every revolution. The sun itself is not stationary and moves around another point which could be another star/balck hole/white dwarf or any other point which is not clear.

The following video will make you understand what I have written better
https://www.youtube.com/watch?v=9Ml4_Jv_HkE.


There are 4 yugas in the mentioned in Hindu philosophy. The yugas are caused because of the changing elliptical path earth keeps taking. The number of years of each yugas in timeline are given in the picture.  The symbols used by Christianity for dividing the time period is also given in the image.




The intent of this post is to collect information in a single place. The references and links for the image used and whatever is written above is given below:

https://www.youtube.com/watch?v=9Ml4_Jv_HkE
http://www.bibliotecapleyades.net/esp_precession.htm
http://www.skepticalscience.com/print.php?n=837
http://allgratitude.com/gmcks_message/Yugas_and_the_Zodiac.html

I hope this post becomes useful to you.

Thanks !

Tuesday, November 6, 2007

Super glue ?? What is it ??

A single drop of super glue can permanently join your thumb to your index finger faster than you can say "Whoops," and a 1-square-inch bond can hold more than a ton. So how does this remarkable substance work? The answer lies in its main ingredient, cyanoacrylate (C5H5NO2, for you chemistry buffs).

Cyanoacrylate is an acrylic resin that cures (forms its strongest bond) almost instantly. The only trigger it requires is the hydroxyl ions in water, which is convenient since virtually any object you might wish to glue will have at least trace amounts of water on its surface.
White glues, such as Elmer's, bond by solvent evaporation. The solvent in Elmer's all-purpose school glue is water. When the water evaporates, the polyvinylacetate latex that has spread into a material's crevices forms a flexible bond. Super glue, on the other hand, undergoes a process called anionic polymerization. Cyanoacrylate molecules start linking up when they come into contact with water, and they whip around in chains to form a durable plastic mesh. The glue thickens and hardens until the thrashing molecular strands can no longer move.
If you think cyanoacrylate's ability to repair broken knick-knacks is super, wait until you hear about its other tricks. Super-glue fuming is sometimes used in criminal investigations to detect latent fingerprints. It works like this:

The object to be checked for prints is placed in a heated, airtight container.
Cyanoacrylate is introduced; it evaporates and is circulated throughout the container by fans.
The gaseous glue reacts with materials that may have been left behind in fingerprints (such as amino acids and glucose) and makes them visible. Another interesting application is the use of cyanoacrylate to close wounds in place of stitches. Researchers found that by changing the type of alcohol in super glue, from ethyl or methyl alcohol to butyl or octyl, the compound becomes less toxic to tissue. With further research, the practice may become more widespread and could eventually replace the need for stitching up lacerations.


If you happen to find yourself in a super-sticky situation, a little bit of acetone nail-polish remover helps to unglue fingers.


Superglue was discovered by accident -- twice!
Superglue is used for just about anything, including surgery.
Doctors are getting quite irritated with bottles containing superglue that look like bottles containing eyedrops.

Thursday, November 1, 2007

GPS- Global Positioning System

The Global Positioning System (GPS) is a satellite-based navigation system made up of a network of 24 satellites placed into orbit by the U.S. Department of Defense. GPS was originally intended for military applications, but in the 1980s, the government made the system available for civilian use. GPS works in any weather conditions, anywhere in the world, 24 hours a day. There are no subscription fees or setup charges to use GPS.

A GPS receiver calculates its position by measuring the distance between itself and three or more GPS satellites. Measuring the time delay between transmission and reception of each GPS microwave signal gives the distance to each satellite, since the signal travels at a known speed near the speed of light. These signals also carry information about the satellites' location and general system health (known as almanac and ephemeris data). By determining the position of, and distance to, at least three satellites, the receiver can compute its position using trilateration Receivers typically do not have perfectly accurate clocks and therefore track one or more additional satellites, using their atomic clocks to correct the receiver's own clock error.

How it works
GPS satellites circle the earth twice a day in a very precise orbit and transmit signal information to earth. GPS receivers take this information and use triangulation to calculate the user's exact location. Essentially, the GPS receiver compares the time a signal was transmitted by a satellite with the time it was received. The time difference tells the GPS receiver how far away the satellite is. Now, with distance measurements from a few more satellites, the receiver can determine the user's position and display it on the unit's electronic map.
A GPS receiver must be locked on to the signal of at least three satellites to calculate a 2D position (latitude and longitude) and track movement. With four or more satellites in view, the receiver can determine the user's 3D position (latitude, longitude and altitude). Once the user's position has been determined, the GPS unit can calculate other information, such as speed, bearing, track, trip distance, distance to destination, sunrise and sunset time and more.

Good things that can happen after the corona

Many have written about how dangerous corona is. Many have also written about a dystopian future. Of course we are seeing lot of deaths in C...