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thomasvas

The Space Dentist; Science Integrity Digest - 2 views

scienceintegritydigest.com/...the-space-dentist

integrity space

shared by thomasvas on 04 Jun 19 - No Cached
  • thomasvas on 04 Jun 19
     
    Toothache in space? No problem.
Luzi Bergamin

First circuit breaker for high voltage direct current - 2 views

new.abb.com/hvdc-grid

technology phy

shared by Luzi Bergamin on 13 Nov 12 - No Cached
LeopoldS liked it
  • Luzi Bergamin on 13 Nov 12
     
    Doesn't really sound sexy, but this is of utmost importance for next generation grids for renewable energy.
  • LeopoldS on 13 Nov 12
     
    I agree on the significance indeed - a small boost also for my favourite Desertec project ... Though their language is a bit too "grandiose": "ABB has successfully designed and developed a hybrid DC breaker after years of research, functional testing and simulation in the R&D laboratories. This breaker is a breakthrough that solves a technical challenge that has been unresolved for over a hundred years and was perhaps one the main influencers in the 'war of currents' outcome. The 'hybrid' breaker combines mechanical and power electronics switching that enables it to interrupt power flows equivalent to the output of a nuclear power station within 5 milliseconds - that's as fast as a honey bee takes per flap of its wing - and more than 30 times faster than the reaction time of an Olympic 100-meter medalist to react to the starter's gun! But its not just about speed. The challenge was to do it 'ultra-fast' with minimal operational losses and this has been achieved by combining advanced ultrafast mechanical actuators with our inhouse semiconductor IGBT valve technologies or power electronics (watch video: Hybrid HVDC Breaker - How does it work). In terms of significance, this breaker is a 'game changer'. It removes a significant stumbling block in the development of HVDC transmission grids where planning can start now. These grids will enable interconnection and load balancing between HVDC power superhighways integrating renewables and transporting bulk power across long distances with minimal losses. DC grids will enable sharing of resources like lines and converter stations that provides reliability and redundancy in a power network in an economically viable manner with minimal losses. ABB's new Hybrid HVDC breaker, in simple terms will enable the transmission system to maintain power flow even if there is a fault on one of the lines. This is a major achievement for the global R&D team in ABB who have worked for years on the challeng
johannessimon81

Peel-and-Stick: Fabricating Thin Film Solar Cell on Universal Substrates - 3 views

www.nature.com/...srep01000.html

technology

shared by johannessimon81 on 28 Feb 13 - No Cached
LeopoldS liked it
  • LeopoldS on 28 Feb 13
     
    any clue how? "With the peel-and-stick process, we integrated hydrogenated amorphous silicon (a-Si:H) TFSCs on paper, plastics, cell phone and building windows while maintaining the original 7.5% efficiency. The new peel-and-stick process enables further reduction of the cost and weight for TFSCs and endows TFSCs with flexibility and attachability for broader application areas. We believe that the peel-and-stick process can be applied to thin film electronics as well"
Luís F. Simões

Physicists Discover a Whopping 13 New Solutions to Three-Body Problem - ScienceNOW - 1 views

news.sciencemag.org/...cists-discover-a-whopping.html

MAD

shared by Luís F. Simões on 10 Mar 13 - No Cached
  • The discovery of 13 new families, made by physicists Milovan Šuvakov and Veljko Dmitrašinović at the University of Belgrade, brings the new total to 16.
  • All the solutions can be viewed online
  • Dario Izzo on 10 Mar 13
     
    They search numerically for initial conditions resulting in periodic orbits. Reminds to me the methods we employed for the "search for invariant relative motion" and which brought us to discover the magic inclinations (47.9 degrees). I wonder what are the implications. In any case nice plots :)
  • Francesco Biscani on 11 Mar 13
     
    Haven't read in detail, but it's not clear to me what it means exactly. If they were discovered numerically (I assume it means via numerical integration), how can they be sure the orbits are truly periodic?
jcunha

Clothes that receive and transmit digital information are closer to reality - 1 views

techxplore.com/...it-digital-closer-reality.html

technology fabrics BIO functional materials

shared by jcunha on 14 Apr 16 - No Cached
  • jcunha on 14 Apr 16
     
    Hard work in functional materials is driving the development of new wearable electronics that could be advantageous for communications and sensing is being pursued in the Advanced Functional Fabrics of America Institute. Through embroidering circuits into fabric with 0.1 mm precision full integration of electronic components such as sensors and computer memory devices into clothing is now possible.
Thijs Versloot

Putting 1.6TB on a DVD sized disk using muliplexed optical recording @Nature - 0 views

www.nature.com/...nature08053.html

data technology

shared by Thijs Versloot on 15 Jan 14 - No Cached
  • Thijs Versloot on 15 Jan 14
     
    Multiplexed optical recording provides an unparalleled approach to increasing the information density beyond 1012 bits per cm3 (1 Tbit cm-3) by storing multiple, individually addressable patterns within the same recording volume. Although wavelength, polarization and spatial dimension have all been exploited for multiplexing, these approaches have never been integrated into a single technique that could ultimately increase the information capacity by orders of magnitude.
LeopoldS

Getting more out of your satellite TV / Telecommunications & Integrated Applications / ... - 2 views

www.esa.int/..._more_out_of_your_satellite_TV

shared by LeopoldS on 12 Nov 13 - No Cached
  • LeopoldS on 12 Nov 13
     
    smart idea
Thijs Versloot

A microwave metamaterial with integrated power harvesting functionality - 3 views

scitation.aip.org/...1.4824473

metamaterials power sensor wifi

shared by Thijs Versloot on 04 Jul 14 - No Cached
LeopoldS liked it
  • Thijs Versloot on 04 Jul 14
     
    We present the design and experimental implementation of a power harvesting metamaterial. A maximum of 36.8% of the incident power from a 900 MHz signal is experimentally rectified by an array of metamaterial unit cells. We demonstrate that the maximum harvested power occurs for a resistive load close to 70 Ω in both simulation and experiment.
jcunha

Training and operation of an integrated neural network based on memristors - 0 views

www.nature.com/...nature14441.html

NAN science technology memristor AI neuromorphic

shared by jcunha on 07 May 15 - No Cached
LeopoldS liked it
  • jcunha on 07 May 15
     
    Almost in time for the workshop last week! This new Nature paper (e-mail me for full paper) claims training and usage of neural network implemented with metal-oxide memristors, without selector CMOS. They used it to implement a delta-rule algorithm for classification of 3x3 pixel black and white letters. Very impressive work!!!!
  • jcunha on 07 May 15
     
    For those not that much into the topic, see the Nature's News and View section www.nature.com/nature/journal/v521/n7550/full/521037a.html?WT.ec_id=NATURE-20150507 where they feature this article.
Alexander Wittig

iRobot Brings Visual Mapping and Navigation to the Roomba 980 - 1 views

spectrum.ieee.org/...d-navigation-to-the-roomba-980

shared by Alexander Wittig on 18 Sep 15 - No Cached
  • Alexander Wittig on 18 Sep 15
     
    Finally the thing will have a little more artificial intelligence than just "bump into wall, turn a bit, repeat". We've known for a while now that iRobot has been developing robots with wireless integration along with intelligent navigation capability based on VSLAM (Vision Simultaneous Localization and Mapping). We've know this for enough of a while that it's been a little bit frustrating to see iRobot's most recent Roomba upgrades come out without those neat features.
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.
Dario Izzo

Probabilistic Logic Allows Computer Chip to Run Faster - 3 views

www.azonano.com/news.asp

INF MAD probabilistic computing AI

shared by Dario Izzo on 07 Dec 09 - Cached
  • Dario Izzo on 07 Dec 09
     
    Francesco pointed out this research one year ago, we dropped it as noone was really considering it ... but in space a low CPU power consumption is crucial!! Maybe we should look back into this?
  • ...6 more comments...
  • Ma Ru on 07 Dec 09
     
    Q1: For the time being, for what purposes computers are mainly used on-board?
  • Dario Izzo on 07 Dec 09
     
    for navigation, control, data handling and so on .... why?
  • Ma Ru on 07 Dec 09
     
    Well, because the point is to identify an application in which such computers would do the job... That could be either an existing application which can be done sufficiently well by such computers or a completely new application which is not already there for instance because of some power consumption constraints... Q2 would be then: for which of these purposes strict determinism of the results is not crucial? As the answer to this may not be obvious, a potential study could address this very issue. For instance one can consider on-board navigation systems with limited accuracy... I may be talking bullshit now, but perhaps in some applications it doesn't matter whether a satellite flies on the exact route but +/-10km to the left/right? ...and so on for the other systems. Another thing is understanding what exactly this probabilistic computing is, and what can be achieved using it (like the result is probabilistic but falls within a defined range of precision), etc. Did they build a complete chip or at least a sub-circiut, or still only logic gates...
  • Dario Izzo on 07 Dec 09
     
    Satellites use old CPUs also because with the trend of going for higher power modern CPUs are not very convenient from a system design point of view (TBC)... as a consequence the constraints put on on-board algorithms can be demanding. I agree with you that double precision might just not be necessary for a number of applications (navigation also), but I guess we are not talking about 10km as an absolute value, rather to a relative error that can be tolerated at level of (say) 10^-6. All in all you are right a first study should assess what application this would be useful at all.. and at what precision / power levels
  • Joris _ on 07 Dec 09
     
    The interest of this can be a high fault tolerance for some math operations, ... which would have for effect to simplify the job of coders! I don't think this is a good idea regarding power consumption for CPU (strictly speaking). The reason we use old chip is just a matter of qualification for space, not power. For instance a LEON Sparc (e.g. use on some platform for ESA) consumes something like 5mW/MHz so it is definitely not were an engineer will look for some power saving considering a usual 10-15kW spacecraft
  • Dario Izzo on 07 Dec 09
     
    What about speed then? Seven time faster could allow some real time navigation at higher speed (e.g. velocity of a terminal guidance for an asteroid impactor is limited to 10 km/s ... would a higher velocity be possible with faster processors?) Another issue is the radiation tolerance of the technology ... if the PCMOS are more tolerant to radiation they could get more easily space qualified.....
  • Joris _ on 08 Dec 09
     
    I don't remember what is the speed factor, but I guess this might do it! Although, I remember when using an IMU that you cannot have the data above a given rate (e.g. 20Hz even though the ADC samples the sensor at a little faster rate), so somehow it is not just the CPU that must be re-thought. When I say qualification I also imply the "hardened" phase.
  • Francesco Biscani on 08 Dec 09
     
    I don't know if the (promised) one-order-of-magnitude improvements in power efficiency and performance are enough to justify looking into this. For once, it is not clear to me what embracing this technology would mean from an engineering point of view: does this technology need an entirely new software/hardware stack? If that were the case, in my opinion any potential benefit would be nullified. Also, is it realistic to build an entire self-sufficient chip on this technology? While the precision of floating point computations may be degraded and still be useful, how does all this play with integer arithmetic? Keep in mind that, e.g., in the Linux kernel code floating-point calculations are not even allowed/available... It is probably possible to integrate an "accelerated" low-accuracy floating-point unit together with a traditional CPU, but then again you have more implementation overhead creeping in. Finally, recent processors by Intel (e.g., the Atom) and especially ARM boast really low power-consumption levels, at the same time offering performance-boosting features such as multi-core and vectorization capabilities. Don't such efforts have more potential, if anything because of economical/industrial inertia?
LeopoldS

Track changes with LaTeX - 3 views

trackchanges.sourceforge.net

latex

shared by LeopoldS on 25 Jan 10 - Cached
  • LeopoldS on 25 Jan 10
     
    did any of you Latex gurus already try this out?
  • ...1 more comment...
  • Luzi Bergamin on 25 Jan 10
     
    It's installed on my computer, but I never really used it. I think it's fine, but for my purposes latexdiff mostly is enough.
  • LeopoldS on 25 Jan 10
     
    I assume that you use latexdiff from the command line ... still have to find a nice script with which to integrate it into the TexShop GUI for Karène ...
  • Luzi Bergamin on 25 Jan 10
     
    A command line is an interface as well. I was able to explain via phone to a (computer-wise) avarage undereducated Mac-user how to install and run latexdiff. Thus I think also Karene can use it...
LeopoldS

PLoS ONE: HAMLET Interacts with Lipid Membranes and Perturbs Their Structure and Integrity - 1 views

www.plosone.org/...journal.pone.0009384

cancer medical

shared by LeopoldS on 22 Apr 10 - Cached
  • LeopoldS on 22 Apr 10
     
    does not taste good but ....
Dario Izzo

YouTube - Informationvisualization - VisLink - 3 views

www.youtube.com/watch

visualization

shared by Dario Izzo on 22 Feb 11 - No Cached
Nicholas Lan liked it
  • Dario Izzo on 22 Feb 11
     
    Solution to DeathTouch Problem......
  • Luís F. Simões on 22 Feb 11
     
    Original implementation Integrating 2D Mouse Emulation with 3D Manipulation for Visualizations on a Multi-Touch Table -- project built on top of VisLink, check video !!
Luís F. Simões

Shell energy scenarios to 2050 - 6 views

www.shell.com/...shell_energy_scenarios_2050

energy future forecast politics economy climate_change

shared by Luís F. Simões on 09 Mar 11 - No Cached
  • Luís F. Simões on 09 Mar 11
     
    just in case you were feeling happy and optimistic
  • ...7 more comments...
  • Francesco Biscani on 09 Mar 11
     
    An energy scenario published by an oil company? Allow me to be sceptical...
  • Joris _ on 10 Mar 11
     
    Indeed, Shell is an energy company, not just oil, for some time now ... The two scenarii are, in their approach, dependant of economic and political situation, which is right now impossible to forecast. Reference to Kyoto is surprising, almost out-dated! But overall, I find it rather optimistic at some stages, and probably the timeline (p37-39) is unlikely with recent events.
  • Luís F. Simões on 10 Mar 11
     
    the report was published in 2008, which explains the reference to Kyoto, as the follow-up to it was much more uncertain at that point. The Blueprint scenario is indeed optimistic, but also quite unlikely I'd say. I don't see humanity suddenly becoming so wise and coordinated. Sadly, I see something closer to the Scramble scenario as much more likely to occur.
  • LeopoldS on 12 Mar 11
     
    not an oil company??? please have a look at the percentage of their revenues coming from oil and gas and then compare this with all their other energy activities together and you will see very quickly that it is only window dressing ... they are an oil and gas company ... and nothing more
  • Joris _ on 14 Mar 11
     
    not JUST oil. From a description: "Shell is a global group of energy and petrochemical companies." Of course revenues coming from oil are the biggest, the investment turnover on other energy sources is small for now. Knowing that most of their revenues is from an expendable source, to guarantee their future, they invest elsewhere. They have invested >1b$ in renewable energy, including biofuels. They had the largest wind power business among so-called "oil" companies. Oil only defines what they do "best". As a comparison, some time ago, Apple were selling only computers and now they sell phones. But I would not say Apple is just a phone company.
  • LeopoldS on 14 Mar 11
     
    window dressing only ... e.g. Net cash from operating activities (pre-tax) in 2008: 70 Billion$ net income in 2008: 26 Billion revenues in 2008: 88 Billion Their investments and revenues in renewables don't even show up in their annual financial reports since probably they are under the heading of "marketing" which is already 1.7 Billion $ ... this is what they report on their investments: Capital investment, portfolio actions and business development Capital investment in 2009 was $24 billion. This represents a 26% decrease from 2008, which included over $8 billion in acquisitions, primarily relating to Duvernay Oil Corp. Capital investment included exploration expenditure of $4.5 billion (2008: $11.0 billion). In Abu Dhabi, Shell signed an agreement with Abu Dhabi National Oil Company to extend the GASCO joint venture for a further 20 years. In Australia, Shell and its partners took the final investment decision (FID) for the Gorgon LNG project (Shell share 25%). Gorgon will supply global gas markets to at least 2050, with a capacity of 15 million tonnes (100% basis) of LNG per year and a major carbon capture and storage scheme. Shell has announced a front-end engineering and design study for a floating LNG (FLNG) project, with the potential to deploy these facilities at the Prelude offshore gas discovery in Australia (Shell share 100%). In Australia, Shell confirmed that it has accepted Woodside Petroleum Ltd.'s entitlement offer of new shares at a total cost of $0.8 billion, maintaining its 34.27% share in the company; $0.4 billion was paid in 2009 with the remainder paid in 2010. In Bolivia and Brazil, Shell sold its share in a gas pipeline and in a thermoelectric power plant and its related assets for a total of around $100 million. In Canada, the Government of Alberta and the national government jointly announced their intent to contribute $0.8 billion of funding towards the Quest carbon capture and sequestration project. Quest, which is at the f
  • Joris _ on 14 Mar 11
     
    thanks for the info :) They still have their 50% share in the wind farm in Noordzee (you can see it from ESTEC on a clear day). Look for Shell International Renewables, other subsidiaries and joint-ventures. I guess, the report is about the oil branch. http://sustainabilityreport.shell.com/2009/servicepages/downloads/files/all_shell_sr09.pdf http://www.noordzeewind.nl/
  • LeopoldS on 16 Mar 11
     
    no - its about Shell globally - all Shell .. these participations are just peanuts please read the intro of the CEO in the pdf you linked to: he does not even mention renewables! their entire sustainability strategy is about oil and gas - just making it (look) nicer and environmentally friendlier
  • Joris _ on 16 Mar 11
     
    Fair enough, for me even peanuts are worthy and I am not able to judge. Not all big-profit companies, like Shell, are evil :( Look in the pdf what is in the upstream and downstream you mentionned above. Non-shell sources for examples and more objectivity: http://www.nuon.com/company/Innovative-projects/noordzeewind.jsp http://www.e-energymarket.com/news/single-news/article/ferrari-tops-bahrain-gp-using-shell-biofuel.html thanks.
Joris _

The Space Review: Breaking up may be good to do - 6 views

www.thespacereview.com/...1

space system

shared by Joris _ on 03 Nov 09 - Cached
LeopoldS liked it
  • LeopoldS on 04 Nov 09
     
    I especially like " The program will also create a "developer's kit" of open hardware and software specifications to make it easier for new components to integrate into such fractionated systems." Joris: wanna take the lead on having a closer look on this, I definitely would like to be part of it and happy to contribute, possibly also Juxi? - first assessment by Christmas realistic?
  • Joris _ on 04 Nov 09
     
    I think it a very interesting approach. If you google "darpa F6", you should see that a lot seems to be on-going. So, should we do something about it before having the conclusions of the Darpa study ?
  • LeopoldS on 04 Nov 09
     
    wait and see is never a good approach in these cases .... first step has to be anyway to understand what they are up to and then to think about our own ideas on it, own approaches, alternatives and then to see what we can do specifically in the team on it.
pacome delva

Physics - Nanospheres on a silver plate - 0 views

physics.aps.org/64

phy nan nanoparticle

shared by pacome delva on 05 Aug 09 - Cached
  • As a result of its high symmetry and conjugated bond structure, the electronic properties of C60 are very unusual, and there is a massive research effort toward integrating it into molecular scale electronic devices [4].
  • In this context, it is important to understand how the molecule forms bonds with a metal substrate, such as silver, which is commonly used as an electrode material.
  • The general trend in all of these cases shows that even molecules with relatively weak individual (atom-to-atom) surface bonds can induce substantial substrate reconstructions in order to create favorable adsorption sites [8]. Such “nanopatterning” of substrates is essential to the stability of ordered structures of these molecules and can critically influence their electronic structure, which is an important aspect in the design of molecular electronic devices.
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