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pacome delva

Stones from Sticks | Physical Review Focus - 1 views

focus.aps.org/st13

nan phy nanodiamond

shared by pacome delva on 07 Oct 09 - Cached
  • to make nanoscale diamond crystals, researchers have used their own tricks, including recipes involving carbon nanotubes.
  • nanodiamonds could be used as hard protective coatings in small scale systems or sensors.
Joris _

Spaceflight Now | Breaking News | Sweden's Prisma satellites go their separate ways - 1 views

spaceflightnow.com/...11prisma

MAD technology space

shared by Joris _ on 13 Aug 10 - Cached
  • exotic green propellant maneuvering systems
  • In the two months since launch, controllers have powered up the satellites' navigation and formation flying equipment, tested its green propellant thruster, and successfully navigated around orbital debris threats.
  • a smorgasbord of payloads
Juxi Leitner

Rapid design and manufacture of novel micro-devices - 0 views

nextbigfuture.com/...-and-manufacture-of-novel.html

rapid design micro devices technology

shared by Juxi Leitner on 23 Aug 10 - No Cached
  • Starting with a commercial micro-fluidics polymer prototyping kit (from ThinXXS), the project successfully developed a 'template' polymer system into which silicon components can be simply 'plugged in'.
LeopoldS

Comparison of Two GaN Transistor Technologies in Broadband Power Amplifiers  ... - 1 views

www.mwjournal.com/...article.asp

technology NRG wireless WPT

shared by LeopoldS on 10 Oct 10 - No Cached
  • LeopoldS on 10 Oct 10
     
    interesting paper for wireless energy transmission ... Duncan have a look ...
  • duncan barker on 11 Oct 10
     
    Yeah, its nice to see some research into semiconductors which aren't silicon. This paper would be useful for us if we wanted to do a study of the efficiency of the DC to microwave conversion systems for SPS.
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
santecarloni

[1011.6263] Electrostatic accelerometer with bias rejection for Gravitation and Solar S... - 6 views

arxiv.org/1011.6263

PHY gravity

shared by santecarloni on 30 Nov 10 - No Cached
  • santecarloni on 30 Nov 10
     
    Is it really true?
  • pacome delva on 02 Dec 10
     
    Article 1011.6263 doesn't exist
  • pacome delva on 03 Dec 10
     
    ha it's back! Yes they are talking about GAP since some time in France, and lobbying to put it on a planetary mission.
Luís F. Simões

The 70 Online Databases that Define Our Planet - 0 views

www.technologyreview.com/...26097

Living Earth Simulator database data modelling simulator forecast

shared by Luís F. Simões on 07 Dec 10 - No Cached
  • an ambitious European plan to simulate the entire planet. The idea is to exploit the huge amounts of data generated by financial markets, health records, social media and climate monitoring to model the planet's climate, societies and economy. The vision is that a system like this can help to understand and predict crises before they occur so that governments can take appropriate measures in advance.
  • Luís F. Simões on 07 Dec 10
     
    website of the project working on the 'Living Earth Simulator': http://www.futurict.ethz.ch/FuturICT five page summary of the FuturICT Proposal: http://www.futurict.ethz.ch/data/FuturICT-FivePageSummary.pdf
Joris _

Japan probe overshoots Venus, heads toward sun - 0 views

www.washingtonpost.com/...AR2010120701077.html

MAD venus robust

shared by Joris _ on 08 Dec 10 - No Cached
sreejanag liked it
  • A Japanese probe to Venus failed to reach orbit Wednesday and was captured by the sun's gravitational pull
  • Akatsuki's engines did not fire long enough to attain the proper orbiting position
  • may be able to try again when it passes by Venus six years from now.
  • Joris _ on 08 Dec 10
     
    The usefulness of having a robust trajectory :) ... They have to wait 6 more years for another date with Venus ...
  • ...2 more comments...
  • Joris _ on 09 Dec 10
  • LeopoldS on 11 Dec 10
     
    I agree in general but just out of the stomach: is there really an optimised trajectory that would be able to avoid this kind of scenarios when main thrusters don't perform properly? Wouldn't you in any case end up in a sun-orbiting trajectory and have to come back after years??
  • Joris _ on 11 Dec 10
     
    "optimised trajectory" of course not, robust definitely! It was the subject of my paper presented at the AAS (the one in San Diego) "Designing robust interplanetary trajectories subject to one temporary engine failure". The problem here is that they do not have enough fuel for a correction maneuver that would allow to come back to Venus earlier, and break for a VOI. A robust scenario could have alloted the best amount of fuel and time to be able to recover from almost all possible unplanned events. In the paper, I introduce some confidence regions such that I get the robust control for p% chance of mission success in case m% chance of problem with the propulsion system.
  • Dario Izzo on 12 Dec 10
     
    You should run your method on this scenario and see if you could get a trajectory with a shorter come back time using the same spacecraft.... would be a big selling point for a new trajectory design approach
Francesco Biscani

BBC News - Nasa rides 'bucking bronco' to Mars - 2 views

news.bbc.co.uk/...8509080.stm

nasa mars

shared by Francesco Biscani on 19 Feb 10 - Cached
  • Francesco Biscani on 19 Feb 10
     
    Look at the video... are they really going to pull this off?
  • Ma Ru on 19 Feb 10
     
    > it will be lowered on to the surface of Mars with a landing system that has never been tried before yikes!
LeopoldS

Arbuscular mycorrhizal fungi as support systems for seedling establishment in grassland... - 0 views

www3.interscience.wiley.com/...abstract

BIO

shared by LeopoldS on 24 Dec 09 - No Cached
  • LeopoldS on 24 Dec 09
     
    we discussed this once - think with Tobias ... these very complex fungi in soils and their interaction with plants .... nice paper
  • Ma Ru on 25 Dec 09
     
    Fungi rule!!!
Joris _

Galileo space navigation system to be ready in 2014 | Business | Deutsche Welle | 07.01... - 1 views

www.dw-world.de/...0,,5096845,00.html

MAD GPS

shared by Joris _ on 07 Jan 10 - Cached
  • Joris _ on 07 Jan 10
     
    6 years later ...
  • Nicholas Lan on 08 Jan 10
     
    seems optimistic
pacome delva

Quantum computer takes on quantum chemistry - physicsworld.com - 1 views

physicsworld.com/...41432

phy quantum_computation

shared by pacome delva on 21 Jan 10 - Cached
  • The process is done 20 times to create a 20-bit binary number that represents the energy of the hydrogen molecule to a precision of about one part per million.
  • Aspuru-Guzik described the two-qubit calculation as a "baby step forward," and added that a 128-qubit system would be needed to work out the energy levels of a simple molecule such as water.
LeopoldS

HP Labs' Central Nervous System for the Earth project aims to build a planetwide sensin... - 4 views

www.hpl.hp.com/...cense.html

NAN nanoengineering smart dust

shared by LeopoldS on 01 Feb 10 - Cached
  • LeopoldS on 01 Feb 10
     
    is it worth having another look at this smart dust evolution? anybody interested?
pacome delva

Condensation transition in networks and other complex systems - 4 views

nuweb.neu.edu/...Condensation.html

phy bio complex_networks

shared by pacome delva on 15 Jan 10 - Cached
  • pacome delva on 15 Jan 10
     
    I like this work... it mixes physics, networks and biology ! Anyone heard about her ? Here's an interesting paper found on this website: http://nuweb.neu.edu/gbianconi/condensation.pdf
  • ...3 more comments...
  • Francesco Biscani on 15 Jan 10
     
    Eh... Barabasi is really milking the golden cow :) It seems interesting, even if I don't remember enough from my statistical mechanics classes to truly understand it without a major effort. Maybe you could make a layman's science coffee about it?
  • pacome delva on 15 Jan 10
     
    yeah i could if there's enough interest...? do u know Barabasi ?
  • Francesco Biscani on 15 Jan 10
     
    He's quite well known for his work on scale-free networks: http://en.wikipedia.org/wiki/Albert-L%C3%A1szl%C3%B3_Barab%C3%A1si He's applying them for everything and the kitchen sink :) We have a Barabasi-Albert network topology implemented in PaGMO...
  • Dario Izzo on 16 Jan 10
     
    We worked on this with Luzi a few years back ... while the analogy is original and interesting it fails to capture the dynamics of a network, e.g. if a network has hubs that grow and shrink .... Luzi worked on an extended model to solve this issue, but, if I remember correctly, he got stuck in a computationally very hard problem .... We intended to develop and use the extended model to define relevant characteristic of the ESA network formed by mail exchanges.....
  • nikolas smyrlakis on 18 Jan 10
     
    ...but then the CMS YGT didn't really like the project
pacome delva

Superconductors could simulate the brain - 2 views

physicsworld.com/...41916

superconductors brain

shared by pacome delva on 08 Mar 10 - Cached
  • who have shown how networks of artificial neurons containing two Josephson junctions would outpace more traditional computer-simulated brains by many orders of magnitude. Studying such junction-based systems could improve our understanding of long-term learning and memory along with factors that may contribute to disorders like epilepsy.
  • The existing design does not permit learning since the weighting of connections between synapses cannot be changed over time, but Segall believes that if this feature can be added then their neurons might allow a lifetime's worth of learning to be simulated in five or ten minutes. This, he adds, should help us to understand how learning changes with age and might give us clues as to how long-term disorders like Parkinson's disease develops.
  • Christos Ampatzis on 09 Mar 10
     
    What I don't get is how the measure the extent of matching: how "close", or realistic is the modelisation they achieve with different methods? And moreover, if weights cannot adapt and there are no direct connections between neurons and layers of neurons, isnt that a very arbitrary matching?
Francesco Biscani

STLport: An Interview with A. Stepanov - 2 views

www.stlport.org/...StepanovUSA.html

computer science

shared by Francesco Biscani on 23 Mar 10 - Cached
  • Generic programming is a programming method that is based in finding the most abstract representations of efficient algorithms.
  • I spent several months programming in Java.
  • for the first time in my life programming in a new language did not bring me new insights
  • ...2 more annotations...
  • it has no intellectual value whatsoever
  • Java is clearly an example of a money oriented programming (MOP).
  • Francesco Biscani on 23 Mar 10
     
    One of the authors of the STL (C++'s Standard Template Library) explains generic programming and slams Java.
  • ...6 more comments...
  • Ma Ru on 24 Mar 10
     
    "Java is clearly an example of a money oriented programming (MOP)." Exactly. And for the industry it's the money that matters. Whatever mathematicians think about it.
  • Joris _ on 24 Mar 10
     
    It is actually a good thing that it is "MOP" (even though I do not agree with this term): that is what makes it inter-operable, light and easy to learn. There is no point in writing fancy codes, if it does not bring anything to the end-user, but only for geeks to discuss incomprehensible things in forums. Anyway, I am pretty sure we can find a Java guy slamming C++ ;)
  • Francesco Biscani on 24 Mar 10
     
    Personally, I never understood what the point of Java is, given that: 1) I do not know of any developer (maybe Marek?) that uses it for intellectual pleasure/curiosity/fun whatever, given the possibility of choice - this to me speaks loudly on the objective qualities of the language more than any industrial-corporate marketing bullshit (for the record, I argue that Python is more interoperable, lighter and easier to learn than Java - which is why, e.g., Google is using it heavily); 2) I have used a software developed in Java maybe a total of 5 times on any computer/laptop I owned over 15 years. I cannot name of one single Java project that I find necessary or even useful; for my usage of computers, Java could disappear overnight without even noticing. Then of course one can argue as much as one wants about the "industry choosing Java", to which I would counterargue with examples of industry doing stupid things and making absurd choices. But I suppose it would be a kind of pointless discussion, so I'll just stop here :)
  • Joris _ on 24 Mar 10
     
    "At Google, python is one of the 3 "official languages" alongside with C++ and Java". Java runs everywhere (the byte code itself) that is I think the only reason it became famous. Python, I guess, is more heavy if it were to run on your web browser! I think every language has its pros and cons, but I agree Java is not the answer to everything... Java is used in MATLAB, some web applications, mobile phones apps, ... I would be a bit in trouble if it were to disappear today :(
  • Dario Izzo on 24 Mar 10
     
    I personally do not believe in interoperability :)
  • Ma Ru on 24 Mar 10
     
    Well, I bet you'd notice an overnight disappearance of java, because half of the internet would vanish... J2EE technologies are just omnipresent there... I'd rather not even *think* about developing a web application/webservice/web-whatever in standard C++... is it actually possible?? Perhaps with some weird Microsoft solutions... I bet your bank online services are written in Java. Certainly not in PHP+MySQL :) Industry has chosen Java not because of industrial-corporate marketing bullshit, but because of economics... it enables you develop robustly, reliably, error-prone, modular, well integrated etc... software. And the costs? Well, using java technologies you can set-up enterprise-quality web application servers, get a fully featured development environment (which is better than ANY C/C++/whatever development environment I've EVER seen) at the cost of exactly 0 (zero!) USD/GBP/EUR... Since many years now, the central issue in software development is not implementing algorithms, it's building applications. And that's where Java outperforms many other technologies. The final remark, because I may be mistakenly taken for an apostle of Java or something... I love the idea of generic programming, C++ is my favourite programming language (and I used to read Stroustroup before sleep), at leisure time I write programs in Python... But if I were to start a software development company, then, apart from some very niche applications like computer games, it most probably would use Java as main technology.
  • Francesco Biscani on 24 Mar 10
     
    "I'd rather not even *think* about developing a web application/webservice/web-whatever in standard C++... is it actually possible?? Perhaps with some weird Microsoft solutions... I bet your bank online services are written in Java. Certainly not in PHP+MySQL :)" Doing in C++ would be awesomely crazy, I agree :) But as I see it there are lots of huge websites that operate on PHP, see for instance Facebook. For the banks and the enterprise market, as a general rule I tend to take with a grain of salt whatever spin comes out from them; in the end behind every corporate IT decision there is a little smurf just trying to survive and have the back covered :) As they used to say in the old times, "No one ever got fired for buying IBM". "Industry has chosen Java not because of industrial-corporate marketing bullshit, but because of economics... it enables you develop robustly, reliably, error-prone, modular, well integrated etc... software. And the costs? Well, using java technologies you can set-up enterprise-quality web application servers, get a fully featured development environment (which is better than ANY C/C++/whatever development environment I've EVER seen) at the cost of exactly 0 (zero!) USD/GBP/EUR... Since many years now, the central issue in software development is not implementing algorithms, it's building applications. And that's where Java outperforms many other technologies." Apart from the IDE considerations (on which I cannot comment, since I'm not a IDE user myself), I do not see how Java beats the competition in this regard (again, Python and the huge software ecosystem surrounding it). My impression is that Java's success is mostly due to Sun pushing it like there is no tomorrow and bundling it with their hardware business.
  • Joris _ on 24 Mar 10
     
    OK, I think there is a bit of everything, wrong and right, but you have to acknowledge that Python is not always the simplest. For info, Facebook uses Java (if you upload picture for instance), and PHP is very limited. So definitely, in company, engineers like you and me select the language, it is not a marketing or political thing. And in the case of fb, they come up with the conclusion that PHP, and Java don't do everything but complement each other. As you say Python as many things around, but it might be too much for simple applications. Otherwise, I would seriously be interested by a study of how to implement a Python-like system on-board spacecrafts and what are the advantages over mixing C, Ada and Java.
Luzi Bergamin

Compact metallo-dielectric optical antenna for ultra directional and enhanced radiative... - 3 views

arxiv.org/1003.4880

phy nan antenna

shared by Luzi Bergamin on 26 Mar 10 - Cached
LeopoldS liked it
  • Luzi Bergamin on 26 Mar 10
     
    A new paper related to our old Ariadna on microstructured radiators.
  • LeopoldS on 28 Mar 10
     
    This is actually a very nice paper in my view .... José, have a look at it!! "This study demonstrates that appropriately designed metallo-dielectric systems can serve as compact, highly directive and ultra radiative antennas. Let us emphasize that contrary to fully metallic antennas, the high directivity of this antenna does not result from a plasmonic effect, and that it is efficient over a wide range of frequencies. In consequence, the high directivity does compromise the high radiative decay rate enhancement offered by two coupled metallic particles and it is possible to exploit whispering gallery modes to further enhance the radiative decay rates. This work paves the way towards the design of compact, simple and highly efficient optical antennas."
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