HOME >> BIOLOGY >> NEWS
Physics tip sheet #29 October 23, 2002

m.

Preprint: http://www.arxiv.org/abs/cs.CC/0210020

7) Surfing chemical reactions
J. Wolff, A. G. Papathanasiou, H. H. Rotermund, G. Ertl
To appear in Physical Review Letters

Chemical reactions can surf on a wave of light-generated heat, according to new experiments. Physicists looked at the catalytic oxidation of carbon monoxide (as happens in catalytic converters for vehicle exhaust systems). They hit the catalytic surface (made of platinum) with a laser to heat it in a small region, then moved the laser to change the hot spot on the catalyst. The conversion reaction moved with the hot spot, "surfing" on the moving waves of heat. If the laser was moved too quickly, the reaction fell off the back of the wave to leave isolated spots of reaction.

Journal article: Available on request

8) Micro gravity
J. Chiaverina, S. J. Smullin, A. A. Geraci, D. M. Weld, A. Kapitulnik
arXiv preprint server

If the universe has extra dimensions, they might show up by modifying the force of gravity at small scales. Because gravity is relatively weak, it is hard to measure it precisely but physicists are continually pushing to smaller scales. A new experiment takes another bite out of the region where gravity could present surprises. Experimentalists moved a cantilever only a few hundreds of micrometers in size over a pattern of gold and silicon stripes. The different densities mean different forces from gravity and the cantilever bent different amounts. The results show that gravity doesn't show any huge departures from that predicted by conventional gravity, down to scales of 25 micrometers. In the process, it rules out some of the theories that predicted modification to gravity on these scales.

Preprint: http://www.arxiv.org/abs/hep-ph/0209325
'"/>

Contact: David Harris
harris@aps.org
301-209-3238
American Physical Society
23-Oct-2002


Page: 1 2 3 4

Related biology news :

1. Physics gravity model applicable to disease spread
2. Physics tip sheet #42
3. Physics tip sheet #41 - April 5, 2004
4. Physics tip sheet #39 - Nov. 17, 2003
5. Physics tip sheet #37
6. Physics tip sheet #36 - July 30, 2003
7. Physics tip sheet #34 - April 1, 2003
8. Physics tip sheet #33 March 28, 2003
9. Physics tip sheet #30 - January 9, 2003
10. Physics tip sheet #21 July 10, 2002
11. Physics tip sheet #20 July 3, 2002

Post Your Comments:
*Name:
*Comment:
*Email:


(Date:11/7/2018)... ... November 07, 2018 , ... uBiome, the leader in ... Computational Biosciences Program within the Department of Medicine, University of Colorado, Denver, to ... around the world, Dr. Lozupone will bring to uBiome an expertise on the ...
(Date:11/7/2018)... ... November 07, 2018 , ... The awards were presented ... science industry. The event was attended by 150 industry executives from leading life ... drug discovery. The winners were determined by responses to an online ballot completed ...
(Date:11/3/2018)... FALLS CHURCH, Va. (PRWEB) , ... November 01, ... ... Quality: , New Regulations, New Guidance, New Challenges and New Opportunities, **Presented by ... http://www.fdanews.com/trendsmdregquality , Early bird pricing for Emerging Trends ...
Breaking Biology News(10 mins):
(Date:11/13/2018)... ... November 13, 2018 , ... Renowned Honolulu veterinarian, Dr. Patrick Leadbeater, has begun ... Dr. Leadbeater, of Kahala Pet Hospital on Oahu, is a skilled ... traveling to the island of Kauai on an almost weekly basis to perform surgery ...
(Date:11/13/2018)... , ... November 13, 2018 , ... ... of the spine technology market last week that asserts it is still trending ... population. , Humad’s analysis describes market consolidation, pricing pressure and increased ...
(Date:11/11/2018)... ... ... Triple W, an innovator of connected health devices, today announced that it ... ®, the first health tech wearable device for incontinence that monitors how full your ... announcement was made during CES Unveiled New York, an invite-only tech event bringing together ...
(Date:11/9/2018)... SEABROOK, N.H. and PHILADELPHIA (PRWEB) , ... November ... ... leading 25-year-old control system integrator of custom industrial automation and IT solutions with ... will be exhibiting at Automation Fair®, taking place at the Pennsylvania Convention Center ...
Breaking Biology Technology:
Cached News: