Reginald L. Goodwin's Posts (3027)

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Concussion Physics...


I saw this briefly, and juxtapose my commentary between Sports Science and Mr. Hayes' Saturday morning commentary.

As someone who loved playing sandlot football, high school football and a sports fan, this is concerning. I present it with no agenda, but post a question: in 2113, will we still be playing football?

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Up With Chris Hayes: Is Football Responsible for Junior Seau's Death

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Mars in Motion...


The seasonal thawing of carbon dioxide ice near Mars' north pole carves grooves in the region's sand dunes, three new studies reveal.

 

The discovery, made using observations from NASA's Mars Reconnaissance Orbiter spacecraft (MRO), reinforces that the Red Planet's surface continues to be transformed today, even though Mars' volcanoes have died out and its liquid surface water apparently dried up long ago.

 

Space.com: Dry Ice 'Smoke' Carves Up Mars Sand Dunes,
Mike Wall, Senior Writer

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Living Legend Lectures...

Speaking at the National Society of Black Physicists conference 2011 - UT Austin

I have this book - The First Three Minutes - he autographed when I was in the Astrophysics department. It was a treat to meet him, and an honor to hear him speak at the NSBP conference.

AMAZON: Nobel Laureate Steven Weinberg combines his exceptional physical insight with his gift for clear exposition to provide a concise introduction to modern quantum mechanics. Ideally suited to a one-year graduate course, this textbook is also a useful reference for researchers. Readers are introduced to the subject through a review of the history of quantum mechanics and an account of classic solutions of the Schrödinger equation, before quantum mechanics is developed in a modern Hilbert space approach. The textbook covers many topics not often found in other books on the subject, including alternatives to the Copenhagen interpretation, Bloch waves and band structure, the Wigner-Eckart theorem, magic numbers, isospin symmetry, the Dirac theory of constrained canonical systems, general scattering theory, the optical theorem, the 'in-in' formalism, the Berry phase, Landau levels, entanglement and quantum computing. Problems are included at the ends of chapters, with solutions available for instructors at www.cambridge.org/9781107028722.
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SQUID-Like BEC...

Physics World: Bose-Einstein Condensate torus cut by a laser

Physicists in the US have developed an analogue of a superconducting quantum interference device (SQUID) that replaces the superconductor with a Bose–Einstein condensate and measures rotation rather than magnetic flux. They hope that the research will lead to the development of new, ultra-sensitive gyroscopes.


The SQUID is a well-established and extremely sensitive device for measuring magnetic fields that has found a range of commercial applications. At its heart is a loop of superconductor broken by one or two Josephson junctions. These are thin barriers of non-superconducting material that superconducting pairs of electrons are able to tunnel across. SQUIDs rely on the fact that superconducting electrons are all represented by the same wavefunction, which extends around the loop and includes the junctions. This means that the current that flows around the loop – and therefore the magnetic flux through the loop – is quantized at discrete values. If the magnetic flux in the loop increases or decreases, there is an oscillation in the voltage across the Josephson junctions every time the magnetic flux changes by one quanta. These quanta are very small and therefore an extremely small change in magnetic flux can be measured by counting the voltage oscillations.

Physics World: Physicists create SQUID-like Bose–Einstein condensate

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Why HS Science Teachers ROCK...


An astronomy teacher at Pomfret School in Connecticut, USA, won first prize in the Hubble's Hidden Treasures image processing competition. The competition invited members of the public to dig out unreleased scientific data from Hubble's vast archive, and to process them into stunning images. Lake's image is of a particularly bright region of the Large Magellanic Cloud, which is located some 200,000 light-years from Earth. The gas within it slowly collapses to form new stars. In turn, the stars light up the gas clouds. In this particular winning image shows both star forming regions as well as dusty, planet-forming regions made of material from stars that have died. The Hubble archive remains open, and the outreach team invites others to search it for more hidden treasures.
LMC - see Hubble Telescope below

 

Pomfret School: "To Infinity and Beyond" - at Least to Harvard
Hubble Telescope: A hidden treasure in the Large Magellanic Cloud

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Barkhausen Effect...


Almost 100 years after the initial discovery, a team of scientists at the University of Alberta and the National Institute for Nanotechnology in Edmonton have harnessed the Barkhausen Effect as a new kind of high-resolution microscopy for the insides of magnetic materials.


The researchers say the technique has the potential to provide critical information as a rapid prototyper for magnetic computational devices that expand the role of magnetism within computers.


R&D Quantitative magneto-mechanical made possible by the Barkhausen Effect

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We All Did...

...as a nation. E pluribus unum: "out of many, one."

 

 

 

From Wiki Answers:

What is the historical significance of interposition and nullification?

Answer:
Interposition: means that a state of the U.S. may oppose any federal action it believes encroaches on its power 
Nullification: refers to a U.S state refusing to enforce a federal law on Constitutional grounds.
Their historical significance can be traced back to the Brown v. Board of Education trial, where the Supreme Court declared that racial segregation in public schools violated the Equal Protection clause of the 14th Amendment. In response to this case, State legislatures from Alabama, Georgia, Mississippi, South Carolina, and Virginia adopted resolutions of "interposition and nullification," where they could oppose the ruling and refuse to enforce the desegregation of public schools.

 

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Table-Top Protons...

Credit: Physics World - Lateral Dose

Proton therapy is used in the treatment of cancer and hopeful remission from the disease.

There is a significant difference between standard (x-ray) radiation treatment and proton therapy. If given in sufficient doses, x-ray radiation techniques will control many cancers. But, because of the physician's inability to adequately conform the irradiation pattern to the cancer, healthy tissues may receive a similar dose and can be damaged. Consequently, a less- than-desired dose is frequently used to reduce damage to healthy tissues and avoid unwanted side effects. The power of protons is that higher doses of radiation can be used to control and manage cancer while significantly reducing damage to healthy tissue and vital organs.1

*****

A table-top proton accelerator for medical therapy could be one step closer thanks to work done by physicists in Germany. The team's system is based on a compact Ti:sapphire laser, which fires ultrashort light pulses at a diamond-like foil to produce bunches of protons with energies of around 5 MeV.

The team has shown that its device delivers radiation doses to biological cells that are similar to doses created by much larger conventional proton-therapy systems. The researchers say that the technique could also be used to study ultrafast processes in biology and chemistry.2

1. The National Association for Proton Therapy, Official Site
2. Pulsed lasers could make proton therapy more accessible, Physics World

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Relativity Strikes Back...


So much for the coolness of near, or at light speed travel.

I'd probably just stay in the Hollow Deck until we got where the ship was going...

You're on board the Millennium Falcon. You give the command to jump to light speed. The stars outside turn into long streaks of light and you're off. It's one of the most memorable images of sci-fi space travel ever created. It's also likely to be pretty far from reality, according to a study by a group of students from the U.K.'s University of Leicester.



The study, titled "Relativistic Optics Strikes Back," was published in the University of Leicester's Journal of Physics Special Topics. You can indulge in all the delicious physics equations in the abstract.



The physics students started by imagining that the Millennium Falcon has accidentally wandered into our solar system, on a direct course for our sun. If it then engaged in near-light speed travel, the stars around it wouldn't appear to stretch out. Instead, it would look more like a disc of light.

W00t:


One concern: navigation. "All I ask is a tall ship and a star to steer her by," John Masefield from the poem "Sea Fever." Definitely not a job for Mr. Sulu, nor battles "pivoting at Warp 2." It would take some sophisticated computing, predicting where stars are before your acceleration (so you wouldn't slam into anything - that ruins any trip).

If we were ever to do it: the thrill would be in getting to the end of the trip, to clearly view the stars from another sky, and eventually the soil of another earth.

CNET: Near-lightspeed space travel: Not as cool-looking as you think

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DNA Origami...


TECHNOLOGY REVIEW: One of the most promising ways to capture, generate and manipulate photons is with tiny diamonds. The secret is to create nanodiamonds with a defect in their structure where a nitrogen atom has taken the place of a carbon.




Quantum physicists are particularly interested in these so-called nitrogen vacancies because they can capture, store and emit the quantum information that photons carry. What’s more, they do all this at room temperature. It is even possible to manipulate this information using magnetic and electric fields.

 

In short, nitrogen vacancies are important building blocks for for quantum computers.

 

But there’s a problem. It’s not hard to make individual nanodiamonds but it is extremely difficult to arrange them next to each other so that the quantum information they store can be processed.

 

Their idea is to bind nanodiamonds together with the required nanometre precision using biological molecules such as DNA and protein. What’s more, they say they’ve demonstrated the technique for the first time.

 

Physics arXiv: Self-assembling hybrid diamond-biological quantum devices

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Really, Really BIG...

The coloured background indicates the peaks and troughs in the occurrence of quasars at the distance of the LQC. Darker colours indicate more quasars, lighter colours indicate fewer quasars.

An international team of astronomers, led by academics from the University of Central Lancashire (UCLan), has found the largest known structure in the universe. The large quasar group (LQG) is so large that it would take a vehicle travelling at the speed of light some 4 billion years to cross it. The team publish their results in the journal Monthly Notices of the Royal Astronomical Society.



Quasars are the nuclei of galaxies from the early days of the universe that undergo brief periods of extremely high brightness that make them visible across huge distances. These periods are 'brief' in astrophysics terms but actually last 10-100 million years.



Since 1982 it has been known that quasars tend to group together in clumps or 'structures' of surprisingly large sizes, forming large quasar groups or LQGs.



The team, led by Dr Roger Clowes from UCLan's Jeremiah Horrocks Institute, has identified the LQG which is so significant in size it also challenges the Cosmological Principle: the assumption that the universe, when viewed at a sufficiently large scale, looks the same no matter where you are observing it from.



The modern theory of cosmology is based on the work of Albert Einstein, and depends on the assumption of the Cosmological Principle. The Principle is assumed but has never been demonstrated observationally 'beyond reasonable doubt'.

Royal Astronomical Society: Astronomers discover the largest structure in the universe

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Social Entropy...


1. A measure of the unavailable energy in a closed thermodynamic system that is also usually considered to be a measure of the system's disorder, that is a property of the system's state, and that varies directly with any reversible change in heat in the system and inversely with the temperature of the system; broadly : the degree of disorder or uncertainty in a system

2. a : the degradation of the matter and energy in the universe to an ultimate state of inert uniformity; b : a process of degradation or running down or a trend to disorder



3. chaos, disorganization, randomness, see Meridian-Webster

Further examples of entropy: aging, obesity; methods to counter: vitamins, exercise, diet.

No measure, despite how noble the intentions, will 100% protect us from our fellow humans, and comparisons to dangers from knives, cars and baseball bats obfuscates the issue at hand: the warping of the constitution to justify building personal arsenals (with no apparent responsibility to secure them), and the wealth of weapons manufacturers. Mr. LaPierre is a lobbyist, and like so many "chicken hawk patriots" conveniently missed his generations' opportunity to be a "good guy with a gun" and represent his country in Vietnam.


In Chicago, in New Orleans, in East Winston-Salem, East/South Side ____________, random acts of violence are seen by the same media as a personal failing in "that area of town" versus a structural failing. That structure is society as a whole and a failure to apply not the Second Amendment, but the Second Law of Thermodynamics - Entropy - to systems decaying due to the market-driven and void meaning now of "education," avarice, career politicians pimping constituencies with the flimsiest fidelity to principles or promises, propped up by corrupt money interests whose only ambition is not "the common good," but to maximize profits, avoiding taxes and bequeathing large truckloads of treasure to their heirs.

In physics, entropy is why there can be no such thing in nature as 100% efficiency or perpetual motion machines. Thus, no one political party, culture/race has, or should have a complete lock on the Oval Office and the Presidential Mansion (as it was once called).


We are given sound bites and sloganeering: speeches on "shining cities on a hill," whereas we have the stench of a dung heap ripe with methane for the lighting. Lit by ignorance, goaded by pundits with zero education, zero sophistication, zero appreciation for nuance that some of our fellow mortals cannot digest; that some of their worst pronouncements might as well be from clouds and smoke on Mount Sinai.

And by some stretch of sanity, what would be gained if such inane, insane actors were actually successful in what could nakedly be called revolution and armed insurrection? The Pyrrhic ashes of anarchic victories are a poor foundation to rebuild a republic from.


As I watch the news, I'm not sure if this is an enactment of Animal Farm, or a slow train wreck. Some common sense suggestions:

"Common sense is not so common." Voltaire

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Deus Ex Machina...


In recent years, machines have grown increasingly capable of listening, communicating, and learning—transforming the way they collaborate with us, and significantly impacting our economy, health, and daily routines. Who, or what, are these thinking machines? As we teach them to become more sophisticated, how will they complement our lives? What will separate their ways of thinking from ours? And what happens when these machines understand data, concepts, and behaviors too big or impenetrable for humans to grasp? We were joined by IBM’s WATSON, the computer Jeopardy! champion, along with leading roboticists and computer scientists, to explore the thinking machines of today and the possibilities to come in the not-too-distant future.
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Beautiful Minds...


Immanuel Kant, who coined the term genius in the 1700s, defined it as the rare capacity to independently understand concepts that would normally have to be taught by another person. Since then, the spectrum of abilities that we call genius has widened, but pivotal questions remain: What exactly is genius? Where do the remarkable abilities of genius come from?

 

Site: World Science Festival

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The One That Got Away...

Grateful to my friend from Austin, Texas Deone Wilhite for this posting...

Dr. Neil deGrasse Tyson, age 9 (see link below)

At age nine, after a trip to the Hayden Planetarium—the same planetarium he would direct 25 years later—Tyson decided on a career in astrophysics. “I felt called by the universe to do this,” he says, “and that has never changed.”

In junior high, Tyson took to using his telescope on the roof of his apartment building. At the sight of a teenager fumbling with a mysterious object in the night, neighbors often thought they saw a thief and called the police, whom he would placate by offering a look through the lens.

In high school, Tyson won summer scholarships to study astrophysics in Africa, Utah, and Scotland. He rubbed elbows with astronaut Neil Armstrong and biochemist and sci-fi writer Isaac Asmiov. At 15 he was invited to give his first lecture, to an extension class at the City University of New York.

“It was as natural as breathing,” Tyson recalls. “I was just talking about what I knew, the way other boys talked about baseball cards.”

Frank Bash, professor emeritus of astronomy and former director of UT’s McDonald Observatory, supervised Tyson as a teaching assistant for Intro to Astronomy. “Neil had a natural gift for teaching,” Bash says. “After he taught, the students would beg for him back. He did crazy stuff—moonwalking in class.”

Doing the moonwalk for his students wasn’t a gag, Tyson says—it was a strategy. “If you’re only using words to communicate as a teacher, why show up?” he says. “Why not just type your notes? Teaching is a full-body performance. The moonwalk was all the rage in 1983, and the students loved it. It made the material work for them.”

Back in the lab, though, things weren’t going as well. Tyson wasn’t making progress on his dissertation, and professors encouraged him to consider alternate careers. He took the criticism hard, and he also faced racial discrimination on campus.

“I was stopped and questioned seven times by University police on my way into the physics building,” he says. “Seven times. Zero times was I stopped going into the gym—and I went to the gym a lot. That says all you need to know about how welcome I felt at Texas.”

"That which does not kill us makes us stronger."

Friedrich Nietzsche

Alcalde - Texas Exes: Star Power
#P4TC: Diaspora 10 February 2012

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Vela Pulsar...


NASA: The star of this movie is the Vela pulsar, a neutron star that was formed when a massive star collapsed. The Vela pulsar is about 1,000 light years from Earth, spansis about 12 miles in diameter, and makes over 11 complete rotations every second, faster than a helicopter rotor. As the pulsar whips around, it spews out a jet of charged particles that race out along the pulsar’s rotation axis at about 70% of the speed of light. In this still image from the movie, the location of the pulsar and the 0.7-light-year-long jet are labeled. 





The Chandra data shown in the movie, containing eight images obtained between June and September 2010, suggest that the pulsar may be slowly wobbling, or precessing, as it spins. The shape and the motion of the Vela jet look strikingly like a rotating helix, a shape that is naturally explained by precession, as shown in this animation [link to mathematica animation from Oleg K]. If the evidence for precession of the Vela pulsar is confirmed, it would be the first time that a jet from a neutron star has been found to be wobbling, or precessing, in this way.

NASA: Chandra page

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MuCap OMC...

MAPLE: Underwater Cosmic-Ray Muon Radiography

The rate at which protons capture muons has been accurately measured for the first time by the MuCap collaboration at the Paul Scherrer Institute (PSI) in Switzerland. This process, which can be thought of as beta decay in reverse, results in the formation of a neutron and a neutrino. The team has also determined a dimensionless factor that influences the rate of muon capture, which was found to be in excellent agreement with theoretical predictions that are based on very complex calculations.





Muons are cousins of the electron that are around 200 times heavier. Beta decays demonstrate the weak nuclear force in which a neutron gets converted into a proton by emitting an electron and a neutrino. Now, replace the electron with the heavier muon and run the process backwards: a proton captures a muon and transforms into a neutron while emitting a neutrino. This process – known as ordinary muon capture (OMC) – is crucial to understanding the weak interaction involving protons.

Physics World: Muon-capture measurement backs QCD prediction

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Below Zero...

Hot minus temperatures: At a negative absolute temperature the energy distribution of particles inverts in comparison to a positive temperature.

What is normal to most people in winter has so far been impossible in physics: a minus temperature. On the Celsius scale minus temperatures are only surprising in summer. On the absolute temperature scale, which is used by physicists and is also called the Kelvin scale, it is not possible to go below zero—at least not in the sense of getting colder than zero kelvin. According to the physical meaning of temperature, the temperature of a gas is determined by the chaotic movement of its particles—the colder the gas, the slower the particles. At zero kelvin (-273 C) the particles stop moving and all disorder disappears. Thus, nothing can be colder than absolute zero on the Kelvin scale.




Physicists at the Ludwig-Maximilians University Munich and the Max Planck Institute of Quantum Optics in Garching have now created an atomic gas in the laboratory that nonetheless has negative Kelvin values. These negative absolute temperatures have several apparently absurd consequences: Although the atoms in the gas attract each other and give rise to a negative pressure, the gas does not collapse—a behavior that is also postulated for dark energy in cosmology. Supposedly impossible heat engines such as a combustion engine with a thermodynamic efficiency of over 100% can also be realized with the help of negative absolute temperatures.

 

R and D mag: A temperature below absolute zero

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Flexible Graphene...

Credit: Article schematic

A team led by Silvija Gradecak [MIT] has succeeded in growing ZnO nanowire arrays on graphene by modifying the surface of the carbon material with conducting polymer interlayers. The researchers synthesized ZnO seed layers on the interfacial polymer layers, which results in well ordered ZnO nanowire growth via a low-temperature hydrothermal process. "The polymer coating process, the ZnO seed layer deposition and hydrothermal ZnO nanowire growth are all possible in solution and under ambient conditions," explained Gradecak. "What is more, the interfacial conductive polymer coating allows for efficient charge transfer between the ZnO nanowires and graphene, so preserving the latter's unique electronic properties."

 

Nanotech web: Graphene optoelectronics goes flexible

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