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Luis Galvan (NochesSinLuna)
Works at lggrCorp
Attends Everest College - Sudbury
Lives in Ontario


Luis Galvan

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Quick and easy way to tie a tie..
#wow   #howto   #gif  

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I'll be checking on the announcement, thanks for the heads up
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Luis Galvan

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Bummer! I didn't get this one yet...
I've been waiting for this OTA!
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Tried downloading the update ... now my system is stalled. Do I risk a system reboot? Just wait it out and hope for the best? Or apply the beer-root method?
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Luis Galvan

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Gravity's Shadow

When Isaac Newton presented his theory of universal gravitation it revolutionized our view of the universe. Rather than having a separate set of laws for the heavens and terrestrial physics, universal gravity unified heaven and Earth and marked the beginning of astrophysics.  But universal gravity required a strange behavior known as action-at-a-distance.  That is, two masses separated by great distances could experience a force of attraction between them without ever being in contact with each other.  Just how that was possible wasn’t clear, and Newton’s theory provided no explanation.

In 1748  Georges-Louis Le Sage proposed a solution to this problem.  He argued that gravity wasn’t due to a mutual attraction between masses, but rather due to the interactions of particles moving through space. In the Le Sage model, the universe is filled with a sea of corpuscles (basically particles) speeding along in all directions.  A single mass would be pushed evenly in all directions, thus there would be a downward force toward its surface. Two masses in the vicinity of each other would cause an imbalance between them.  Basically, the two masses would cast “shadows” upon each other so that there would be less corpuscles in the region between them.  As a result the two masses would be pushed toward each other.

If this kind of “shadow gravity” were real, then it seems that the gravitational force between two masses should be proportional to their size, not their mass.  After all, larger objects cast larger shadows.  But Le Sage argued that masses are mostly empty space, with small clumps of matter spread throughout the object.  The greater an object’s mass, the more numerous the clumps.  Thus matter is somewhat opaque to these gravity corpuscles, but more massive objects are less opaque.  Thus more massive objects cast darker shadows, and therefore are pushed more strongly to each other.

Le Sage’s shadow gravity model was never very popular, in large part because its focus was to explain the mechanism of gravity without making any testable predictions.  Newton’s action-at-a-distance may be strange, but it works extraordinarily well as a physical theory. By the early 1900s, when Einstein developed the general theory of relativity, gravity was seen as a local effect due to the curvature of space.  Action-at-a-distance isn’t needed for gravity, and so Le Sage’s idea is generally considered a failed idea.

That hasn’t stopped some from continuing to pursue the model.  The idea shows up now and then in alternative (aka fringe) models in various forms. As evidence for their ideas, many point to an experiment known as the lunar eclipse gravity test.  If such a shadow gravity model were true, then during a total solar eclipse there should be a small shift in the strength of gravity as the moon shadows Earth from the Sun.  Curiously, there have been experiments to test for such an effect, and there may be a strange gravity shift going on.

Most of the tests focus on the motion of a Foucault pendulum during a total eclipse.  This was first studied by Maurice Allais in 1954, who noted that a pendulum shifted an extra 13 degrees during a total eclipse.  Over the next 50 years similar experiments have been done, with some showing an effect, and some not.  It is sometimes referred to as the Allais effect.  Although shadow gravity fans argue the Allais effect supports their models, but if that were the case there should also be an Allais effect during a lunar eclipse, which hasn’t been observed.  Supporters often note that Allais is a Nobel laureate, but he was awarded the Nobel in Economics, not physics.  The most modern tests for the effect using gravimeters and automated pendulums have observed no Allais effect, so even the validity of the effect is questioned.

Perhaps what’s most interesting about Le Sage’s model is how it got some ideas right.  With light, shadow effects between dust particles do produce a small net attractive force, and that force follows an inverse square relation just like gravity.  It is sometimes referred to as mock gravity.  And matter really is mostly empty space, with dense clumps of matter spread throughout an object.  We now know that these are the nuclei of atoms.

Sometimes in the pursuit of understanding we create models that are right in some ways and wrong in others.  The only way we can separate the good ideas from the bad is to keep testing them against experimental evidence.  It’s how we can move our theories out of the shadows.

Image: Georges-Louis Le Sage
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Cymatics : While this is not new, we have all seen the gifs showing powders and particles which have been arranged in geometric patterns based on the frequency of the vibration applied to plates. As early as 1680, Robert Hooke observed nodal patterns made on glass plates based on modes of vibration. More recently, Jun Rekimoto a researcher at the University of Tokyo has built a device which levitates objects using just sound, and for the first time used it to maneuver them using sound. Read on to know more on the science behind Cymatics!

Article Extract: Physicists have levitated milli­meter-sized objects by trapping them in pockets of low pressure between the crest of one sound wave and the trough of another. But moving those suspended objects has been difficult. Rekimoto’s team set up four arrays of speakers pointed at the center of a half-meter-wide chamber. Once the researchers got an object hovering, they tweaked the intensity of waves in each array to move the object up and down, left and right, and back and forth.

Rekimoto’s team has described manipulating beads, feathers and alcohol droplets in their paper. This could be instrumental in mixing compounds without impurities.

History : Swiss medical doctor and Anthroposophist, Hans Jenny took a methodological and exhaustive approach to documenting Cymatic phenomena. He coined the term "Cymatics" in his 1967 book, Kymatik (translated Cymatics). Jenny delved deeply into the many types of periodic phenomena but especially the visual display of sound. He pioneered the use of laboratory grown piezoelectric crystals, which were quite costly at that time. Hooking them up to amplifiers and frequency generators, the crystals functioned as transducers, converting the frequencies into vibrations that were strong enough to set the steel plates into resonance.

Article Link:

Wikipedia source:

Research Paper:

Gizmodo related article:

Video Link: Three-Dimensional Mid-Air Acoustic Manipulation [Acoustic Levitation] (2013,2014-)

Cymatics as art:

Pics courtesy: Pic on left, Pic on right top:, Pic right middle and bottom:

#Cymatics #vibration #sound #science #sciencesunday  
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Luis Galvan

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Me too!!!!
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Luis Galvan

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Everybody has to shit, but real ganstas like it.
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Happy Easter Monday

Before you scramble, fry, or discard those impeccably painted Easter eggs, take a really close look. Tough as they may seem, chicken eggs are surprisingly porous and with thousands of tiny pores in their calcium carbonate shells, they act as a semipermeable membrane for gas exchange to the developing embryo. #mondaymicroscopy  
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Luis Galvan

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String Theory
Think of a guitar string that has been tuned by stretching the string under tension across the guitar. Depending on how the string is plucked and how much tension is in the string, different musical notes will be created by the string. These musical notes could be said to be excitation modes of that guitar string under tension. 
In a similar manner, in string theory, the elementary particles we observe in particle accelerators could be thought of as the "musical notes" or excitation modes of elementary strings. 
.In string theory, as in guitar playing, the string must be stretched under tension in order to become excited. However, the strings in string theory are floating in spacetime, they aren't tied down to a guitar. Nonetheless, they have tension. The string tension in string theory is denoted by the quantity 1/(2 p a'), where a' is pronounced "alpha prime"and is equal to the square of the string length scale. 
If string theory is to be a theory of quantum gravity, then the average size of a string should be somewhere near the length scale of quantum gravity, called the Planck length, which is about 10-33 centimeters, or about a millionth of a billionth of a billionth of a billionth of a centimeter. Unfortunately, this means that strings are way too small to see by current or expected particle physics technology (or financing!!) and so string theorists must devise more clever methods to test the theory than just looking for little strings in particle experiments. 
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Shouldn't the cat be in a box?
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Luis Galvan

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I'm not sure why I find this so hilarious, but I do. 
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Dear God.........HA!
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Luis Galvan

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Hmmm, OK...
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Holey man
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Graphic design/web/editorial, animation, multimedia, logistics, style correction, social researcher
  • lggrCorp
Map of the places this user has livedMap of the places this user has livedMap of the places this user has lived
San Luis Potosi - Puerto Vallarta - Cuernavaca - Rioverde - Monterrey - Guadalajara - Querétaro - Punta Cana - La Habana - Tepoztlán - Ciudad de México
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I have nothing to bragg about... is just me, doing what I'm supposed to do
  • Everest College - Sudbury
    RMT, 2013 - present
  • Universidad Mesoamericana
    Lic. en Comunicación, 2001 - 2005
  • Universidad Autónoma de San Luis Potosí
    Médico cirujano, 2000 - 2001
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