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Thijs Versloot

Search DuckDuckGo - 0 views

duckduckgo.com

internet

shared by Thijs Versloot on 23 Aug 13 - No Cached
johannessimon81 and H H liked it
  • Thijs Versloot on 23 Aug 13
     
    DuckDuckGo is a search engine that does not track you and, has more instant answers and less spam/clutter. You can still search google hits by added !g to your search query, which will then send an encrypted search request to google and return only the sensible part
  • H H on 23 Aug 13
     
    !w = Wikipedia !wa = Wolfram alpha !y = Yahoo
H H

Math Experts Split the Check - 0 views

mathwithbaddrawings.com/...e-math-experts-split-the-check

shared by H H on 23 Aug 13 - No Cached
  • H H on 23 Aug 13
     
    Engineer : Remember to tip 18%, everybody. Mathematician : Is that 18% of the pre-tax total, or of the total with tax? Physicist : You know, it's simpler if we assume the system doesn't have tax. Computer Scientist : But it does have tax.
Thijs Versloot

Engineers identify how to keep surfaces dry underwater - 1 views

phys.org/...15-08-surfaces-underwater.html

technology

shared by Thijs Versloot on 24 Aug 15 - No Cached
johannessimon81 and jcunha liked it
  • Thijs Versloot on 24 Aug 15
     
    When submerged, water tends to cling to the top of the spikes, while air and water vapor accrue in the pores between them. The combination of trapped air and water vapor within these cavities forms a gaseous layer that deters moisture from seeping into the surface below. More materials with amazing properties. Might even be usefull for liquid fuel tanks?
  • johannessimon81 on 01 Sep 15
     
    I don't quite see how the trapped water vapor keeps the water out of the cavities... since the vapor is at the same low temperature as the water it should hardly exert any pressure at all. One would expect though that surface tension keeps water out of smaller cavities because it tries to minimize surface area. If the water would enter the cavities it would need increase its surface area dramatically which in turn is energetically unfavorable. Interesting application would also be in non-wetting electronics which might make cooling of circuitry a lot easier: you just sink your data center.
Nina Nadine Ridder

Testing shows using microwaves to propel a craft into space might work - 4 views

phys.org/...owaves-propel-craft-space.html

technology propulsion microwaves science

shared by Nina Nadine Ridder on 23 Jul 15 - No Cached
Thijs Versloot and jcunha liked it
  • Nina Nadine Ridder on 23 Jul 15
     
    A team of researchers at Colorado based Escape Dynamics is reporting that initial tests indicate that it might really be possible to launch space-planes into space using microwaves sent from the ground, to allow for a single stage spacecraft. If the idea pans out, the cost savings for sending satellites (or perhaps humans) into orbit could be considerable.
  • Thijs Versloot on 27 Jul 15
     
    Not very new, but a very slick video nonetheless! Will it work? I am not so sure whether "just engineering" applies in this case. The array of antenna's required is quite significant to compensate for beam losses. Wall plug efficiency is not that high therefore, then again.. solar energy is for free almost in the future so who cares.. let's go for it! :)
Thijs Versloot

Deep Learning Machine Teaches Itself Chess in 72 Hours, Plays at International Master L... - 1 views

www.technologyreview.com/...-plays-at-international-master

shared by Thijs Versloot on 15 Sep 15 - No Cached
  • Thijs Versloot on 15 Sep 15
     
    In a world first, an artificial intelligence machine plays chess by evaluating the board rather than using brute force to work out every possible move. It's been almost 20 years since IBM's Deep Blue supercomputer beat the reigning world chess champion, Gary Kasparov, for the first time under standard tournament rules.
  • Paul N on 16 Sep 15
     
    The disadvantage in this kind of engine lies exactly in its inability to extrapolate. You might actually be able to beat it if you play like an idiot.
Nina Nadine Ridder

Quantum computer around the corner after Australian scientists make key breakthrough - 1 views

www.abc.net.au/...s4325962.htm

technology quantum_computing science

shared by Nina Nadine Ridder on 07 Oct 15 - No Cached
LeopoldS liked it
  • Nina Nadine Ridder on 07 Oct 15
     
    Australian scientists have cleared one of the final hurdles for designing and building a quantum computer. The team of engineers from the University of New South Wales has successfully built a core component needed for the computer to operate and the work is published today in the journal Nature.
Thijs Versloot

Electromagnetism generated by symmetry breaking in dielectrics - 0 views

phys.org/...tism-enable-antennas-chip.html

science technology antenna electromagnetism

shared by Thijs Versloot on 09 Apr 15 - No Cached
  • Thijs Versloot on 09 Apr 15
     
    Using dielectric materials as efficient EM radiators and receivers can scale down these antenna's to the chip level, reducing both weight and power consumption. The infamous internet-of-things one step closer. But could we also transmit power this way?? "In dielectric aerials, the medium has high permittivity, meaning that the velocity of the radio wave decreases as it enters the medium," said Dr Dhiraj Sinha, the paper's lead author. "What hasn't been known is how the dielectric medium results in emission of electromagnetic waves. This mystery has puzzled scientists and engineers for more than 60 years." The researchers determined that the reason for this phenomenon is due to symmetry breaking of the electric field associated with the electron acceleration The researchers found that by subjecting the piezoelectric thin films to an asymmetric excitation, the symmetry of the system is similarly broken, resulting in a corresponding symmetry breaking of the electric field, and the generation of electromagnetic radiation.
Juxi Leitner

Technology Review: Blogs: Guest Blog: Microrobotics Competition Shows Impressive Feats - 1 views

www.technologyreview.com/...25259

micromotors robotics technology

shared by Juxi Leitner on 14 Jun 10 - Cached
LeopoldS liked it
  • the world's best robotics engineers gathered to attempt some of the most impressive feats of micro-manipulation.
Ma Ru

Successful blast-off for Falcon 9 - 4 views

news.bbc.co.uk/...10243614.stm

technology space NASA Falcon 9

shared by Ma Ru on 05 Jun 10 - Cached
  • Ma Ru on 05 Jun 10
     
    Awesome video footage from on-rocket camera, including stage 1 separation and vacuum engine operation.
Juxi Leitner

Astrobotic announces expanded opportunities to send payloads to the Moon : Astrobotic T... - 1 views

astrobotictechnology.com/...s-to-send-payloads-to-the-moon

lunar rover tech technology space opportunities piggyback payload

shared by Juxi Leitner on 25 Jun 10 - Cached
  • The remaining 229 pounds are available for $700,000 per pound, plus a $250,000 fee per payload to cover the engineering costs of integrating it into either the expedition’s lander or its solar-powered robot.
pacome delva

Physics - Small-scale hydraulics - 1 views

physics.aps.org/...PhysRevLett.103.144503

phy nan nanofluidic bio

shared by pacome delva on 07 Oct 09 - Cached
  • Taking a cue from biology, scientists are now designing nanofluidic devices in which molecular interactions at the walls of a narrow channel are engineered to control fluid flow.
Joris _

NASA Set to Launch Solar NanoSail into Space | Inhabitat - Green Design Will Save the W... - 0 views

inhabitat.com/...unch-solar-nanosail-into-space

shared by Joris _ on 20 Aug 10 - Cached
  • 100 square feet;
  • NASA is, rather, testing the deployment mechanism.
  • In 2008, engineers were given just four months to devise a solar sail. They pulled it off, but the rocket carrying the sail experienced launch failure.
  • ...1 more annotation...
  • to learn more about how best to bring older satellites out of space rather than allowing them to become that much more space junk
Juxi Leitner

Pentagon's Shape-Shifting Bot Folds Into Boat, Plane | Danger Room | Wired.com - 0 views

www.wired.com/...r-folds-itself-into-boat-plane

INF robotics smart materials darpa transform technology

shared by Juxi Leitner on 23 Jul 10 - Cached
  • Darpa-backed electrical engineers at the two schools released the stunning results: a shape-shifting sheet of rigid tiles and elastomer joints that can fold itself into a little plane or a boat on demand.
  • In Darpa’s dreams, this work will eventually lead to everything from morphing aircraft to self-styling uniforms to a “universal spare part.”
  • pacome delva on 25 Jul 10
     
    haha! is this a joke...?
  • Juxi Leitner on 26 Jul 10
     
    well i guess the news headline is a bit too much trying to be attractive :)
jmlloren

Exotic matter : Insight : Nature - 5 views

www.nature.com/...index.html

nan phy

shared by jmlloren on 03 Aug 10 - Cached
LeopoldS liked it
  • jmlloren on 03 Aug 10
     
    Trends in materials and condensed matter. Check out the topological insulators. amazing field.
  • ...12 more comments...
  • Luzi Bergamin on 03 Aug 10
     
    Aparently very interesting, will it survive the short hype? Relevant work describing mirror charges of topological insulators and the classical boundary conditions were done by Ismo and Ari. But the two communities don't know each other and so they are never cited. Also a way to produce new things...
  • jmlloren on 04 Aug 10
     
    Thanks for noticing! Indeed, I had no idea that Ari (don't know Ismo) was involved in the field. Was it before Kane's proposal or more recently? What I mostly like is that semiconductors are good candidates for 3D TI, however I got lost in the quantum field jargon. Yesterday, I got a headache trying to follow the Majorana fermions, the merons, skyrnions, axions, and so on. Luzi, are all these things familiar to you?
  • Luzi Bergamin on 04 Aug 10
     
    Ismo Lindell described in the early 90's the mirror charge of what is now called topological insulator. He says that similar results were obtained already at the beginning of the 20th century... Ismo Lindell and Ari Sihvola in the recent years discussed engineering aspects of PEMCs (perfect electro-megnetic conductors,) which are more or less classical analogues of topological insulators. Fundamental aspects of PEMCs are well knwon in high-energy physics for a long time, recent works are mainly due to Friedrich Hehl and Yuri Obukhov. All these works are purely classical, so there is no charge quantisation, no considerations of electron spin etc. About Majorana fermions: yes, I spent several years of research on that topic. Axions: a topological state, of course, trivial :-) Also merons and skyrnions are topological states, but I'm less familiar with them.
  • LeopoldS on 04 Aug 10
     
    "Non-Abelian systems1, 2 contain composite particles that are neither fermions nor bosons and have a quantum statistics that is far richer than that offered by the fermion-boson dichotomy. The presence of such quasiparticles manifests itself in two remarkable ways. First, it leads to a degeneracy of the ground state that is not based on simple symmetry considerations and is robust against perturbations and interactions with the environment. Second, an interchange of two quasiparticles does not merely multiply the wavefunction by a sign, as is the case for fermions and bosons. Rather, it takes the system from one ground state to another. If a series of interchanges is made, the final state of the system will depend on the order in which these interchanges are being carried out, in sharp contrast to what happens when similar operations are performed on identical fermions or bosons." wow, this paper by Stern reads really weired ... any of you ever looked into this?
  • jmlloren on 04 Aug 10
     
    C'mon Leopold, it's as trivial as the topological states, AKA axions! Regarding the question, not me!
  • LeopoldS on 04 Aug 10
     
    just looked up the wikipedia entry on axions .... at least they have some creativity in names giving: "In supersymmetric theories the axion has both a scalar and a fermionic superpartner. The fermionic superpartner of the axion is called the axino, the scalar superpartner is called the saxion. In some models, the saxion is the dilaton. They are all bundled up in a chiral superfield. The axino has been predicted to be the lightest supersymmetric particle in such a model.[24] In part due to this property, it is considered a candidate for the composition of dark matter.[25]"
  • jmlloren on 04 Aug 10
     
    Thank's Leopold. Sorry Luzi for being ironic concerning the triviality of the axions. Now, Leo confirmed me that indeed is a trivial matter. I have problems with models where EVERYTHING is involved.
  • Luzi Bergamin on 04 Aug 10
     
    Well, that's the theory of everything, isn't it?? Seriously: I don't think that theoretically there is a lot of new stuff here. Topological aspects of (non-Abelian) theories became extremely popular in the context of string theory. The reason is very simple: topological theories are much simpler than "normal" and since string theory anyway is far too complicated to be solved, people just consider purely topological theories, then claiming that this has something to do with the real world, which of course is plainly wrong. So what I think is new about these topological insulators are the claims that one can actually fabricate a material which more or less accurately mimics a topological theory and that these materials are of practical use. Still, they are a little bit the poor man's version of the topological theories fundamental physicists like to look at since electrdynamics is an Abelian theory.
  • jmlloren on 04 Aug 10
     
    I have the feeling, not the knowledge, that you are right. However, I think that the implications of this light quantum field effects are great. The fact of being able to sustain two currents polarized in spin is a technological breakthrough.
  • LeopoldS on 04 Aug 10
     
    not sure how much I can contribute to your apparently educated debate here but if I remember well from my work for the master, these non-Abelian theories were all but "simple" as Luzi puts it ... and from a different perspective: to me the whole thing of being able to describe such non-Abelian systems nicely indicates that they should in one way or another also have some appearance in Nature (would be very surprised if not) - though this is of course no argument that makes string theory any better or closer to what Luzi called reality ....
  • Luzi Bergamin on 04 Aug 10
     
    Well, electrodynamics remains an Abelian theory. From the theoretical point of view this is less interesting than non-Abelian ones, since in 4D the fibre bundle of a U(1) theory is trivial (great buzz words, eh!) But in topological insulators the point of view is slightly different since one always has the insulator (topological theory), its surrounding (propagating theory) and most importantly the interface between the two. This is a new situation that people from field and string theory were not really interested in.
  • Dario Izzo on 04 Aug 10
     
    guys... how would you explain this to your gran mothers?
  • jmlloren on 05 Aug 10
  • LeopoldS on 07 Aug 10
     
    *you* tried *your* best .... ??
Joris _

SPACE.com -- Railway to the Sky? NASA Ponders New Launch System - 3 views

www.space.com/...ew-nasa-technology-100914.html

space technology future

shared by Joris _ on 16 Sep 10 - No Cached
  • A team of engineers from NASA's Kennedy Space Center in Florida and some of the agency's other field centers are looking into this and other novel launch systems based on cutting-edge technologies.
  • The launch system would require some advancements of existing technologies, but it wouldn't need any brand-new technologies to work
  • Scramjet vehicles could be used as a basis for a commercial launch program
  • ...1 more annotation...
  • It's not very often you get to work on a major technology revolution
  • Juxi Leitner on 16 Sep 10
     
    I wonder if they are also working with that SCRAMSPACE initiative in Australia that was presented at ESTEC a while back...
  • Giusi Schiavone on 19 Sep 10
     
    what about a space elevator!!! quiet old concept (1895), see this link on wiki http://en.wikipedia.org/wiki/Space_elevator
Joris _

American Institute of Aeronautics and Astronautics - Space and the Biological Economy - 0 views

www.aiaa.org/content.cfm

BIO MAD space science

shared by Joris _ on 11 Oct 10 - No Cached
  • the U.S. space program has a robust life science program that is diligently working to innovate new approaches, research and technologies in the fields of biotechnology and bio-nanotechnology science, which are providing new solutions for old problems – including food security, medical needs and energy needs
  • more money be allocated to develop environmentally sound and energy efficient engine programs for commercial and private aviation
  • waste water program
  • ...3 more annotations...
  • we lack fundamental knowledge about the entire effect of the photosynthesis system on food growth, and that space-based research could provide vital clues to scientists on how to streamline the process to spur more efficient food growth
  • From the start of the space age until 2010 only around 500 people have journeyed into space, but with the advent of private space travel in the next 24 months another 500 people are expected to go into space
  • Wagner indentified prize systems that award monetary prizes to companies or individuals as an effective way to spur innovation and creativity, and urged the Congressional staffers present to consider creating more prize systems to stimulate needed innovation
  • Joris _ on 11 Oct 10
     
    a bunch of ideas, iinitiatives, and good points about upcoming changes in space ...
Giusi Schiavone

Why flies can drink and drink - 1 views

www.sciencenews.org/...Why_flies_can_drink_and_drink

cyborg insect

shared by Giusi Schiavone on 25 Oct 10 - No Cached
  • Giusi Schiavone on 25 Oct 10
     
    Engineers could adapt the insect plumbing to create tiny drug delivery systems
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