Physics
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Jacobs Physics

Jacobs Physics | Physics | Scoop.it

"Resources for teachers and students of introductory physics"

Mikko Hakala's insight:

Lots of good, practical physics content and interesting teaching discussions in this blog.

 

See for example this post about how much the teacher should be talking in front of the class:

http://jacobsphysics.blogspot.fi/2014/01/is-there-any-point-at-all-in-talking-in.html

 

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Scientists open a new window into quantum physics with superconductivity in LEDs

Scientists open a new window into quantum physics with superconductivity in LEDs | Physics | Scoop.it
A team of University of Toronto physicists led by Alex Hayat has proposed a novel and efficient way to leverage the strange quantum physics phenomenon known as entanglement.

Via Jocelyn Stoller
Mikko Hakala's insight:

Put a superconductor in contact with a semiconductor LED. According to the article, when Cooper pairs are injected into LED the emitted photons are entangled. Interesting opening.

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France supports the European XFEL | e-EPS

France supports the European XFEL | e-EPS | Physics | Scoop.it
With a contribution of 36 million € toward the construction, France has joined the European XFEL as a shareholder country.

Via Theo J. Mertzimekis
Mikko Hakala's insight:

Good news. Here are research possibilities what European X-ray Free Electron Laser can do:http://www.xfel.eu/research/possibilities/


Basic info on European XFEL:

http://en.wikipedia.org/wiki/European_x-ray_free_electron_laser

 

 

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Theo J. Mertzimekis's curator insight, March 27, 2014 9:22 AM

A critical step for financing a major machine in Europe

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Physics Simulation Applets

Physics simulation applets - Fysiikan simulaatio-appletit

- Phonon dispersion in a linear chain - fononidispersio lineaarisessa ketjussa

- Ideal gas processes - ideaalikaasuprosesseja

- Vibrating chain - värähtelevä ketju

- Vibrating plane - värähtelevä taso

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Mikko Hakala's comment, March 26, 2014 4:39 PM
Physics applets by @thynnine
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Free Online Physics Courses

Free Online Physics Courses | Physics | Scoop.it
Get free online Physics courses from the world's leading universities. You can download these audio & video courses straight to your computer or mp3 player. For more online courses, visit our complete collection of Free Courses.
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47 courses, from introductory to modern physics.

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Colored diamonds are a superconductor's best friend

Colored diamonds are a superconductor's best friend | Physics | Scoop.it
(Phys.org) —Flawed but colorful diamonds are among the most sensitive detectors of magnetic fields known today, allowing physicists to explore the minuscule magnetic fields in metals, exotic materials and even human tissue.
Mikko Hakala's insight:

Nitrogen-vacancy defect centers in diamond can be used to measure weak magnetic fields. The article describes how they are used to study high-temperature superconductors. 

 

For a more detailed background and physical principles of this type of magnetometry, here are further links to explore.

 

1) Magnetometry with nitrogen-vacancy defects in diamond

http://arxiv.org/abs/1311.5214

 

2) Magnetometry using spins in diamond

http://awsch-web.physics.ucsb.edu/research/measurement_techniques/vector_magnetometry/index.php

 

3) The world's smallest magnetic field sensor - the NV center

http://www.pi3.uni-stuttgart.de/index.php?article_id=39

 

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Jamie's Fusion Project

Jamie's Fusion Project | Physics | Scoop.it

"I am Jamie Edwards, a 13 year old amateur nuclear scientist. At the moment I am building a nuclear fusion reactor and hope to become the youngest "fusioneer". I wouldn't be doing this without the financial support from my school, Penwortham Priory Academy."

Mikko Hakala's insight:

Wow!

http://www.dailymail.co.uk/sciencetech/article-2573998/I-star-jar-13-year-old-youngest-person-world-build-NUCLEAR-FUSION-REACTOR.html

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Attosecond photonics : Nature Photonics

Attosecond photonics : Nature Photonics | Physics | Scoop.it

From the Journal: "Attosecond photonics, currently one of the most promising branches of modern photonics, is progressing at an extremely rapid pace. Although still in its infancy, it has already captured the imagination of the scientific community with its promise of enhancing our understanding of ultrafast phenomena of direct relevance to life, technology and potentially medicine." 

 

Image: SLAC National Accelerator Laboratory, Flickr.

Mikko Hakala's insight:

Focus issue on attosecond photonics.

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X rays Measure Lone Molecules

X rays Measure Lone Molecules | Physics | Scoop.it
Researchers measured an atomic distance in a molecule without using a crystal, which is usually required. Instead they used a beam of isolated molecules.
Mikko Hakala's insight:

This is a great demonstrations how x-ray free electron lasers are used for diffraction imaging of single molecules. 

 

http://journals.aps.org/prl/abstract/10.1103/PhysRevLett.112.083002

 

X-ray scattering data collected at LCLS (https://portal.slac.stanford.edu/sites/lcls_public/)

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Japan researchers testing tiny ear computer

Japan researchers testing tiny ear computer | Physics | Scoop.it
A tiny personal computer that is worn on the ear and can be controlled with the blink of an eye or the click of a tongue is being tested in Japan.
Mikko Hakala's insight:

Wearable computing progresses. Plus:

"Its designs are based on traditional "ikebana" flower arrangements."

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Improvement in polymers for aviation

Improvement in polymers for aviation | Physics | Scoop.it
We live surrounded by polymers and today, rather than come up with new polymers, there is a tendency to modify them in order to obtain new applications. Carbon nanotubes have excellent mechanical properties, are very tough, very rigid, and what is more, they conduct electricity. 'The problem with them ...
Mikko Hakala's insight:

Interesting what one can do with nanocomposites. In this work multiwalled carbon nanotubes dispersed in polymer matrices for better electrical and mechanical properties.

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Map of complex, carbon-rich molecules abundant throughout the universe

Map of complex, carbon-rich molecules abundant throughout the universe | Physics | Scoop.it
Scientists at NASA's Ames Research Center in Moffett Field, Calif., today released a significant expansion and upgrade to a public, online database that houses a unique and extensive collection of information about a family of complex, carbon-rich molecules that are both widespread and abundant throughout ...
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Free Technology for Teachers: Create Virtual Chemical Reactions on Your iPad or Android Tablet

Free Technology for Teachers: Create Virtual Chemical Reactions on Your iPad or Android Tablet | Physics | Scoop.it

"This free iPad app allows students to virtually create chemical reactions. To create the reactions students simply drag elements from the periodic table to the “reaction area.”"


Via Rhondda Powling, John Purificati
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Rhondda Powling's curator insight, February 20, 2014 2:38 AM

This might be a way to offer experiences if you can't get into a lab.

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Physicists on Twitter

Physicists on Twitter | Physics | Scoop.it
List of physicists who have over 1,000 Twitter followers. Tweet additions and comments to @Lucretius21c. This list is available in the Twitter list system. For popular recent tweets of those listed...
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The list gives bio, number of followers and tweet rate.

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Scientists track 3-D nanoscale changes in rechargeable battery material during operation

Scientists track 3-D nanoscale changes in rechargeable battery material during operation | Physics | Scoop.it

Scientists at the U.S. Department of Energy's Brookhaven National Laboratory have made the first 3D observations of how the structure of a lithium-ion battery anode evolves at the nanoscale in a real battery cell as it discharges and recharges.


Via José Gonçalves
Mikko Hakala's insight:

What happens in the real battery's anode material during the initial charge/discharge cycles? For the first time structural evolution could be observed by in situ at nanoscale resolution (~30 nm) in 3D. 

 

Measurements with transmission x-ray microscope at Brookhaven National Synchrotron Light Source.

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Neutron Reactions in Astrophysics

Neutron Reactions in Astrophysics | Physics | Scoop.it

Via Theo J. Mertzimekis
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Review of how elements in the mass region above iron are formed in nucleosynthesis. In this region the formation is dominated by neutron capture.

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Theo J. Mertzimekis's curator insight, March 25, 2014 6:19 PM

A must read for all people involved in Nuclear Astro

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Japan, Belgium and Italy reduce their stockpiles of nuclear material

Japan, Belgium and Italy reduce their stockpiles of nuclear material | Physics | Scoop.it
Announcements made during US-led summit in The Hague aimed at reducing the threat of nuclear terrorism
Mikko Hakala's insight:

 

Nuclear security summit in The Hague. See

https://www.nss2014.com/en/news/outcome-of-nss-2014-a-major-step-towards-a-safer-world

 

Agreements on

- how to reduce dangerous nuclear materials (highly enriched uranium, plutonium)

- improve security of radioactive material (low enriched U, Co-60, Sr-90, Cs-137) that could used for a 'dirty bomb'

- improve international information exchange and cooperation

 

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The rechargeable revolution: A better battery

The rechargeable revolution: A better battery | Physics | Scoop.it
Chemists are reinventing rechargeable cells to drive down costs and boost capacity.
Mikko Hakala's insight:

Perspective on batteries

 

This is a comprehensive article in Nature on battery technologies beyond the current industrial standard. It discusses the targets and challenges in general, and analyzes the advanced Li-ion, Mg-ion, Li-S, Li-O and Na-O cases. It also mentions how fundamental research could help to better understand the battery operation.

 

Article worth reading for state-of-the-art perspective.

 

+ More on Li-O case:

http://phys.org/news/2014-03-battery-power-next-gen-electric-vehicles.html

 

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Crystals ripple in response to light: First propagating surface phonon polaritons in a van der Waals crystal

Crystals ripple in response to light: First propagating surface phonon polaritons in a van der Waals crystal | Physics | Scoop.it
Light can trigger coordinated, wavelike motions of atoms in atom-thin layers of crystal, scientists have shown. The waves, called phonon polaritons, are far shorter than light waves and can be 'tuned' to particular frequencies and amplitudes by varying the number of layers of crystal, they report in ...
Mikko Hakala's insight:

This finding may bring more degrees of freedom to design nanodevices (information flow, heat control, imaging). The phonon polariton wavelength can be adjusted, and there is no electronic dissipation because the material is insulator.  

 

The Science article: Tunable Phonon Polaritons in Atomically Thin van der Waals Crystals of Boron Nitride

http://www.sciencemag.org/content/343/6175/1125.abstract

 

See also: http://en.wikipedia.org/wiki/Polariton

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How France is disposing of its nuclear waste

How France is disposing of its nuclear waste | Physics | Scoop.it

Via Theo J. Mertzimekis
Mikko Hakala's insight:

As a follow-up, here is more information on nuclear power in Finland and plans for final disposal.

 

http://www.world-nuclear.org/info/Country-Profiles/Countries-A-F/Finland/

 

http://news.bbc.co.uk/2/hi/science/nature/4948378.stm

 

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Faster X-ray technology observes catalyst surface at work with atomic resolution

Faster X-ray technology observes catalyst surface at work with atomic resolution | Physics | Scoop.it
By using a novel X-ray technique, researchers have observed a catalyst surface at work in real time and were able to resolve its atomic structure in detail. The new technique, pioneered at DESY's X-ray light source PETRA III, may pave the way for the design of better catalysts and other materials on ...
Mikko Hakala's insight:

High-energy X-ray diffraction is reported as an advantageous imaging technique for surface atomic structures. It can be used at realistic, in situ dynamical conditions (in real time).

 

http://www.sciencemag.org/content/343/6172/758.abstract

 

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Probing wave functions in complex oxides with X-rays

The ground and excited state wave functions of iridium oxides can be interrogated using resonant X-ray scattering techniques. For the first time, the dependence of the scattering cross-sections on the direction of the local magnetic moment has been examined.

Mikko Hakala's insight:

Model to understand resonant x-ray experiments on 5d electrons of iridium in spin-orbit Mott insulators. Resonant X-ray magnetic scattering (RXMS) and resonant inelastic X-ray scattering (RIXS) experiments are considered.

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Free-Electron Lasers Trigger Nuclear Transitions

Free-Electron Lasers Trigger Nuclear Transitions | Physics | Scoop.it
New theoretical calculations show that an x-ray free-electron-laser pulse can generate transitions in excited nuclei via an indirect process involving electron capture.

Via Theo J. Mertzimekis
Mikko Hakala's insight:

An interesting new field to explore for x-ray free-electron laser researchers. 

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Big bang birthday: Six mysteries of a cosmic bombshell - space - 20 February 2014 - New Scientist

Big bang birthday: Six mysteries of a cosmic bombshell - space - 20 February 2014 - New Scientist | Physics | Scoop.it
Fifty years since the first confirmed signal of the big bang and physicists are still wrestling with the questions it raises about the nature of the
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