Physics posts
- December 15, 2010
- 11:59 AM
- 792 views
Graphene – The Stuff of the Future!
by Paul Vallett in Electron Cafe
I’ve mentioned Graphene a few times in the blog and I wanted to spend some time explaining what sort of things people are doing with it, why it’s worthy of a Nobel Prize, and why it’s just plain cool! In fact, check out this picture: Read more below for additional reasons why graphene is awesome… [...]... Read more »
Novoselov, K. (2004) Electric Field Effect in Atomically Thin Carbon Films. Science, 306(5696), 666-669. DOI: 10.1126/science.1102896
Bae, S., Kim, H., Lee, Y., Xu, X., Park, J., Zheng, Y., Balakrishnan, J., Lei, T., Ri Kim, H., Song, Y.... (2010) Roll-to-roll production of 30-inch graphene films for transparent electrodes. Nature Nanotechnology, 5(8), 574-578. DOI: 10.1038/nnano.2010.132
Seol, J., Jo, I., Moore, A., Lindsay, L., Aitken, Z., Pettes, M., Li, X., Yao, Z., Huang, R., Broido, D.... (2010) Two-Dimensional Phonon Transport in Supported Graphene. Science, 328(5975), 213-216. DOI: 10.1126/science.1184014
Lin, Y., Dimitrakopoulos, C., Jenkins, K., Farmer, D., Chiu, H., Grill, A., & Avouris, P. (2010) 100-GHz Transistors from Wafer-Scale Epitaxial Graphene. Science, 327(5966), 662-662. DOI: 10.1126/science.1184289
- December 14, 2010
- 09:04 AM
- 1,404 views
other universes, found only on the arxiv blog…
by Greg Fish in weird things
Is it just me or is the CMBR becoming more like a Rorschach test for some theoretical physicists as of late? I mean, first we have Roger Penrose seeing traces of past Big Bangs and assembling them into a somewhat shaky and dubious model of cyclical cosmology, and now we have a team of astronomers [...]... Read more »
Stephen M. Feeney, Matthew C. Johnson, Daniel J. Mortlock, & Hiranya V. Peiris. (2010) First Observational Tests of Eternal Inflation. n/a. arXiv: 1012.1995v1
- December 13, 2010
- 11:14 AM
- 1,047 views
This “Week” in the Universe: November 30th – December 13th
by S.C. Kavassalis in The Language of Bad Physics
Astrophysics and Gravitation:
The Milky Way Project
The Milky Way Project aims to sort and measure our galaxy, the Milky Way. Initially we’re asking you to help us find and draw bubbles in beautiful infrared data from the Spitzer Space Telescope.
Understanding the cold, dusty material that we see in these images, helps scientists to learn how stars form and how our galaxy changes and evolves with time.
The GalaxyZoo project expands! Help astronomers out when you’re feeling in the........ Read more »
Abhay Ashtekar, Frans Pretorius, & Fethi M. Ramazanoğlu. (2010) Surprises in the Evaporation of 2-Dimensional Black Holes. arXiv. arXiv: 1011.6442v1
V. G. Gurzadyan, & R. Penrose. (2010) Concentric circles in WMAP data may provide evidence of violent pre-Big-Bang activity. arXiv. arXiv: 1011.3706v1
I. K. Wehus, & H. K. Eriksen. (2010) A search for concentric circles in the 7-year WMAP temperature sky maps. arXiv. arXiv: 1012.1268v1
Adam Moss, Douglas Scott, & James P. Zibin. (2010) No evidence for anomalously low variance circles on the sky. arXiv. arXiv: 1012.1305v1
V. G. Gurzadyan, & R. Penrose. (2010) More on the low variance circles in CMB sky. arXiv. arXiv: 1012.1486v1
- December 12, 2010
- 02:00 PM
- 778 views
Optics & stereopsis: how 3D vision is affected by retinal image quality?
by Pablo Artal in Optics confidential
Stereo (3D) vision is affected by the quality of the images in the retina. An adaptive optics instrument allows the testing of 3D vision and more...... Read more »
Fernández, E., Prieto, P., & Artal, P. (2010) Adaptive optics binocular visual simulator to study stereopsis in the presence of aberrations. Journal of the Optical Society of America A, 27(11). DOI: 10.1364/JOSAA.27.000A48
- December 11, 2010
- 10:53 AM
- 1,531 views
roger penrose’s cyclical cosmology revisited
by Greg Fish in weird things
A little while ago, we looked at the cyclical cosmology resurrected by Roger Penrose and his colleague Vahe Gurzadyan, and discussed the major problems it left unaddressed. Now, physicists have tried to replicate a cosmic map with wispy concentric circles of radiation and took to arXiv with their rebuttals. Yes, they could find the circles [...]... Read more »
V.G.Gurzadyan, & R.Penrose. (2010) More on the low variance circles in CMB sky. n/a. info:/1012.1486v1
Adam Moss, Douglas Scott, & James P. Zibin. (2010) No evidence for anomalously low variance circles on the sky. n/a. arXiv: 1012.1305v1
- December 10, 2010
- 03:02 PM
- 806 views
How to get rich fast with batteries
by Joerg Heber in All That Matters
The title of this blog post is a bit tongue in cheek, but the situation isn’t that far from the truth when it comes to rechargeable batteries such as lithium-ion batteries. Ever since lithium-ion batteries were first commercialized in 1991 by Sony, based on work by John Goodenough and others, they have been highly successful in the [...]... Read more »
Padhi, A., Nanjundaswamy, K.S., & Goodenough, J.B. (1997) Phospho-olivines as Positive-Electrode Materials for Rechargeable Lithium Batteries. Journal of The Electrochemical Society, 144(4), 1188. DOI: 10.1149/1.1837571
Chung, S., Bloking, J., & Chiang, Y. (2002) Electronically conductive phospho-olivines as lithium storage electrodes. Nature Materials, 1(2), 123-128. DOI: 10.1038/nmat732
Chan, C., Peng, H., Liu, G., McIlwrath, K., Zhang, X., Huggins, R., & Cui, Y. (2007) High-performance lithium battery anodes using silicon nanowires. Nature Nanotechnology, 3(1), 31-35. DOI: 10.1038/nnano.2007.411
Huang, J., Zhong, L., Wang, C., Sullivan, J., Xu, W., Zhang, L., Mao, S., Hudak, N., Liu, X., Subramanian, A.... (2010) In Situ Observation of the Electrochemical Lithiation of a Single SnO2 Nanowire Electrode. Science, 330(6010), 1515-1520. DOI: 10.1126/science.1195628
- December 9, 2010
- 01:04 PM
- 911 views
No Anomalous Enhancement of Nano-fluid Thermal Conductivity
by Arunn in nOnoScience (a.k.a. Unruled Notebook)
Nano was a buzz word a decade back in the USA. The buck was on anything prefixed with nano. Some useful technology did burgeon, identified now as nano-technology. Solar power, electronics and biotechnology were impacted with nano-engineered materials, capacitors and nano-probes and drug delivery methods. Chemistry and material science research in nano prospered with carbon [...]... Read more »
Buongiorno, J., Venerus, D., Prabhat, N., McKrell, T., Townsend, J., Christianson, R., Tolmachev, Y., Keblinski, P., Hu, L., Alvarado, J.... (2009) A benchmark study on the thermal conductivity of nanofluids. Journal of Applied Physics, 106(9), 94312. DOI: 10.1063/1.3245330
- December 6, 2010
- 05:37 PM
- 1,025 views
Saturn’s rings get spontaneously shaken up
by Kelly Oakes in Basic Space
From far away Saturn’s rings look pretty solid – I’m sure I’m not the only person who, as a child, imagined it’d be possible to skate around the planet on them. In reality, though, they’re made up of millions and … Continue reading →... Read more »
Joseph N. Spitale, & Carolyn C. Porco. (2010) Free Unstable Modes and Massive Bodies in Saturn's Outer B Ring. Astron.J.140:1747-1757,2010. arXiv: 0912.3489v2
- December 6, 2010
- 03:19 AM
- 523 views
Blog: Qubits and Crypto
by Torah Kachur, Rheanna Sand and Brit Trogen in Science in Seconds
Secrets and lies define the government and military, that and being led by bumbling fools. There is no doubt that some military information should be kept secret like technological advances, battle locations and strategies and George W. Bush's IQ. For secrets to be kept away from Wikileaks, cryptography is essential. The new type of cryptography that is being tested by the US military research division, DARPA, is quantum cryptography. Because if codes like DaVinci&........ Read more »
Leach J, Jack B, Romero J, Jha AK, Yao AM, Franke-Arnold S, Ireland DG, Boyd RW, Barnett SM, & Padgett MJ. (2010) Quantum correlations in optical angle-orbital angular momentum variables. Science (New York, N.Y.), 329(5992), 662-5. PMID: 20689014
- December 5, 2010
- 08:25 AM
- 1,733 views
searching for wormholes with general relativity
by Greg Fish in weird things
When you’re reading sci-fi stories in which some of the characters find themselves in need to cover hundreds or thousands of light years very quickly without a warp drive, they manage to make it through time and space via a convenient wormhole. It’s not the worst way to go since wormholes are supposed to exist, [...]... Read more »
Abe, F. (2010) Gravitational microlensing by the Ellis wormhole. The Astrophysical Journal, 725(1), 787-793. DOI: 10.1088/0004-637X/725/1/787
- December 4, 2010
- 06:34 PM
- 846 views
Quantum Teleportation: Science Fiction? NOPE! It's been here, is real, is documented, here's the proof, and here's how it works!
by DJ Busby in Astronasty
An in depth look at Quantum Teleportation... Read more »
DJ Busby. (2010) Quantum Teleportation: Science Fiction? NOPE! It's been here, is real, is documented, here's the proof, and here's how it works!. http://www.astronasty.com. info:/
- December 3, 2010
- 11:16 PM
- 760 views
Re (not the sun god) hypothesizes a solar atom (1903)
by gg in Skulls in the Stars
It is fair to say that the decade surrounding the start of the 20th century was an amazingly perplexing time to be a physicist. Mounting experimental evidence strongly suggested that something was amiss with classical physics, especially in the understanding … Continue reading →... Read more »
Fillipo Re. (1903) Hypothése sur la nature des corps radioactifs. Comptes rendus hebdomadaires des séances de l'Académie des sciences, 1393-1395. info:other/
- December 2, 2010
- 05:07 AM
- 952 views
An electric motor made from a single molecule
by Michael Berger in nanowerk
For the visionary goals of nanotechnology, functional and perhaps autonomous molecular motors will play an essential part, just like electric motors can be found in many appliances today. These nanomachines could perform functions similar to the biological molecular motors found in living cells, things like transporting and assembling molecules, or facilitating chemical reactions by pumping protons through membranes. Although applications of molecular motors are still in the future, the results ........ Read more »
Seldenthuis, J., Prins, F., Thijssen, J., & van der Zant, H. (2010) An All-Electric Single-Molecule Motor. ACS Nano, 4(11), 6681-6686. DOI: 10.1021/nn1021499
- November 30, 2010
- 09:27 AM
- 1,426 views
50 years of metallic glasses
by Joerg Heber in All That Matters
This week I am attending the 2010 Materials Research Society Fall Meeting in Boston — one of the key meetings in materials science. One of the sessions is on bulk metallic glasses and their applications, which this year is a little special. It is organised in honour of the 50 year anniversary of the first demonstration [...]... Read more »
KLEMENT, W., WILLENS, R., & DUWEZ, P. (1960) Non-crystalline Structure in Solidified Gold–Silicon Alloys. Nature, 187(4740), 869-870. DOI: 10.1038/187869b0
- November 29, 2010
- 08:25 PM
- 2,177 views
This Week in the Universe: November 23rd – November 29th
by S.C. Kavassalis in The Language of Bad Physics
Astrophysics and Gravitation:
Lensing of Black Holes Can Determine the Metric Around Them?
Bin-Nun, A. (2010). Gravitational lensing of stars orbiting Sgr A* as a probe of the black hole metric in the Galactic center Physical Review D, 82 (6) DOI: 10.1103/PhysRevD.82.064009
From the abstract:
We show that a possible astrophysical experiment, detection of lensed images of stars orbiting close to Sgr A*, can provide insight into the form of the metric around a black hole. We model Sgr A* as a bl........ Read more »
Bin-Nun, A. (2010) Gravitational lensing of stars orbiting Sgr A* as a probe of the black hole metric in the Galactic center. Physical Review D, 82(6). DOI: 10.1103/PhysRevD.82.064009
Marinoni, C., & Buzzi, A. (2010) A geometric measure of dark energy with pairs of galaxies. Nature, 468(7323), 539-541. DOI: 10.1038/nature09577
Davoudiasl, H., Morrissey, D., Sigurdson, K., & Tulin, S. (2010) Unified Origin for Baryonic Visible Matter and Antibaryonic Dark Matter. Physical Review Letters, 105(21). DOI: 10.1103/PhysRevLett.105.211304
Lucchesi, D., & Peron, R. (2010) Accurate Measurement in the Field of the Earth of the General-Relativistic Precession of the LAGEOS II Pericenter and New Constraints on Non-Newtonian Gravity. Physical Review Letters, 105(23). DOI: 10.1103/PhysRevLett.105.231103
Eugenio Bianchi. (2010) Black Hole Entropy, Loop Gravity, and Polymer Physics. arXiv. arXiv: 1011.5628v1
- November 29, 2010
- 09:51 AM
- 1,243 views
how to navigate in deep space with dead stars
by Greg Fish in weird things
Not only are GPS devices useful, they’re also an ongoing experiment that keeps confirming special relativity’s spot on descriptions of how time flows for fast-moving objects. Without constant adjustments, GPS would be quickly rendered unusable because accurate timing of the signals being sent between the satellites and the moving object they’re supposed to track is [...]... Read more »
Angelo Tartaglia, Matteo Luca Ruggiero, & Emiliano Capolongo. (2010) A null frame for spacetime positioning by means of pulsating sources. Advances in Space Research. arXiv: 1001.1068v3
- November 24, 2010
- 02:12 PM
- 417 views
Paragliding With Pterodactyls
by Michael Gutbrod in A Scientific Nature
The pterosaurs, or pterodactyls as you might recognize them, flew like no creature has ever flown before. Leave it to a reptile to do things differently. While today’s high-fliers have wings with multiple boney “fingers” providing structure, these anomalies of the skies possessed wings with only one long wing finger and a fibrous membrane that [...]... Read more »
Colin Palmer. (2010) Flight in slow motion: aerodynamics of the pterosaur wing. Proceedings of the Royal Society B. info:/10.1098/rspb.2010.2179
- November 24, 2010
- 01:16 PM
- 814 views
Light does matter
by Joerg Heber in All That Matters
Light is special. In our everyday experience it behaves like a wave, which gets reflected, refracted and shows interference with other light of the same wavelength. At the same time, light also consists of particles, so-called photons. This duality is quite fundamental: the Hanbury Brown and Twiss experiment for example only works because of the [...]... Read more »
Klaers, J., Schmitt, J., Vewinger, F., & Weitz, M. (2010) Bose–Einstein condensation of photons in an optical microcavity. Nature, 468(7323), 545-548. DOI: 10.1038/nature09567
- November 24, 2010
- 10:56 AM
- 1,643 views
This “Week” in the Universe: November 9th – November 22nd
by S.C. Kavassalis in The Language of Bad Physics
Astrophysics and Gravitation:
Fundamental constants: Big G revisited
Davis, R. (2010). Fundamental constants: Big G revisited Nature, 468 (7321), 181-183 DOI: 10.1038/468181b
Credit: Nature. a, A spherical 'source mass' (ms) is brought near a pendulum's spherical bob (the 'test mass', mt) and causes the bob to move a small distance z from its usual resting position (grey). The gravitational force between the two masses (left side of equation), which depends on Newton's........ Read more »
Davis, R. (2010) Fundamental constants: Big G revisited. Nature, 468(7321), 181-183. DOI: 10.1038/468181b
Galaxy Zoo. (2010) Galaxy Zoo Supernovae. arXiv. arXiv: 1011.2199v2
Andresen, G., & et al. (2010) Trapped antihydrogen. Nature. DOI: 10.1038/nature09610
V. G. Gurzadyan, & R. Penrose. (2010) Concentric circles in WMAP data may provide evidence of violent pre-Big-Bang activity. arXiv. arXiv: 1011.3706v1
Belgiorno, F., Cacciatori, S., Clerici, M., Gorini, V., Ortenzi, G., Rizzi, L., Rubino, E., Sala, V., & Faccio, D. (2010) Hawking Radiation from Ultrashort Laser Pulse Filaments. Physical Review Letters, 105(20). DOI: 10.1103/PhysRevLett.105.203901
Alberto S. Cattaneo, & Florian Schaetz. (2010) Introduction to supergeometry. arXiv. arXiv: 1011.3401v1
Benjamin Bahr, Bianca Dittrich, & Song He. (2010) Coarse graining theories with gauge symmetries. arXiv. arXiv: 1011.3667v1
Veronika E. Hubeny. (2010) The Fluid/Gravity Correspondence: a new perspective on the Membrane Paradigm. arXiv. arXiv: 1011.4948v1
- November 23, 2010
- 08:00 AM
- 438 views
Reconciling Einstein and Schroedinger
by David Bradley in SciScoop Science Forum
SciScoop contact Nykolai Bilaniuk brought an intriguing paper to our attention recently, that at first glance looks like a typical cracked conjecture of the kind SciScoop has reported in the past, but, says Bilaniuk, this one has a certain credibility. The idea is that of UC Berkeley’s Petr Horava, Bilaniuk tells us, and it’s one [...]Reconciling Einstein and Schroedinger is a post from: SciScoop Science News
... Read more »
Hořava, P. (2009) Quantum gravity at a Lifshitz point. Physical Review D, 79(8). DOI: 10.1103/PhysRevD.79.084008
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