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ESA ACT

Jobs for PhDs - Jobs for PhDs at PhDs.org - 0 views

shared by ESA ACT on 24 Apr 09 - Cached
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Luís F. Simões

Dance Your Ph.D.: And The Winner Is... - ScienceNOW - 2 views

  • The competition challenges scientists around the world to explain their research through the most jargon-free medium available: interpretive dance. The 36 Ph.D. dances submitted this year include techniques such as ballet, break dancing, and flaming hula hoops. Those were whittled down to 12 finalists by the past winners of the contest. Those finalists were then scored by a panel of judges that included scientists, educators, and dancers.
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    Fantastic! You would love my proposal to host an artist in residence in the team :-)
johannessimon81

Bacteria grow electric wire in their natural environment - 1 views

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    Bacterial wires explain enigmatic electric currents in the seabed: Each one of these 'cable bacteria' contains a bundle of insulated wires that conduct an electric current from one end to the other. Cable bacteria explain electric currents in the seabed Electricity and seawater are usually a bad mix.
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    WOW!!!! don't want to even imagine what we do to these with the trailing fishing boats that sweep through sea beds with large masses .... "Our experiments showed that the electric connections in the seabed must be solid structures built by bacteria," says PhD student Christian Pfeffer, Aarhus University. He could interrupt the electric currents by pulling a thin wire horizontally through the seafloor. Just as when an excavator cuts our electric cables. In microscopes, scientists found a hitherto unknown type of long, multi-cellular bacteria that was always present when scientists measured the electric currents. "The incredible idea that these bacteria should be electric cables really fell into place when, inside the bacteria, we saw wire-like strings enclosed by a membrane," says Nils Risgaard-Petersen, Aarhus University. Kilometers of living cables The bacterium is one hundred times thinner than a hair and the whole bacterium functions as an electric cable with a number of insulated wires within it. Quite similar to the electric cables we know from our daily lives. "Such unique insulated biological wires seem simple but with incredible complexity at nanoscale," says PhD student Jie Song, Aarhus University, who used nanotools to map the electrical properties of the cable bacteria. In an undisturbed seabed more than tens of thousands kilometers cable bacteria live under a single square meter seabed. The ability to conduct an electric current gives cable bacteria such large benefits that it conquers much of the energy from decomposition processes in the seabed. Unlike all other known forms of life, cable bacteria maintain an efficient combustion down in the oxygen-free part of the seabed. It only requires that one end of the individual reaches the oxygen which the seawater provides to the top millimeters of the seabed. The combustion is a transfer of the electrons of the food to oxygen which the bacterial inner wires manage over centimeter-long distances. However, s
Marcus Maertens

'Impossible' material made by Uppsala University researchers - 1 views

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    Something for our Nano structure fans. Funniest remark: "One of the researchers got to take advantage of his Russian language skills since some of the chemistry details necessary for understanding the reaction mechanism was only available in an old Russian PhD thesis."
ESA ACT

Calling All Dancing Scientists! -- Bohannon 322 (5899): 186b -- Science - 0 views

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    Dance your PhD - if that isn't a promising ACT topic!
ESA ACT

http://www.ai-junkie.com/ann/evolved/nnt2.html - 0 views

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    Explanation of artificial neural networks (explains very nicely the basics of the programming behind Christos' PhD thesis)
ESA ACT

Zero Email Friday - 0 views

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    like this particularly and would even go one step further: take one day or one half day during the week internet free - just unplug the cable. We did this during my PhD in our lab and it really helped! LS
Thijs Versloot

#dance your PhD finalists 2013 - 2 views

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    Some hilarious dances in between.. Especially the "Sperm competition between brothers and female choice" is brilliant (Made in Oxford btw)
Tom Gheysens

Revolutionizing solar energy: Quantum waves found at the heart of organic solar cells - 1 views

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    pretty interesting! I am still convinced we can do something in this :)
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    There surely must be possibilities indeed, maybe we should expand it to an RF? By coincidence, I bumped into a quantum optics PhD looking for a post-doc, who would love to give a talk in the team on his research (although very different topic) and I invited him for early January.
Dario Izzo

Optimal Control Probem in the CR3BP solved!!! - 7 views

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    This guy solved a problem many people are trying to solve!!! The optimal control problem for the three body problem (restricted, circular) can be solved using continuation of the secondary gravity parameter and some clever adaptation of the boundary conditions!! His presentation was an eye opener ... making the work of many pretty useless now :)
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    Riemann hypothesis should be next... Which paper on the linked website is this exactly?
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    hmmm, last year at the AIAA conference in Toronto I presented a continuation approach to design a DRO (three-body problem). Nothing new here unfortunately. I know the work of Caillau, although interesting what is presented was solved 10 years ago by others. The interest of his work is not in the applications (CR3BP), but in the research of particular regularity conditions that unfortunately make the problem limited practically. Look also at the work of Mingotti, Russel, Topputo and other for the (C)RTBP. Smart-One inspired a bunch of researchers :)
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    Topputo and some of the others 'inspired' researchers you mention are actually here at the conference and they are all quite depressed :) Caillau really solves the problem: as a one single phase transfer, no tricks, no misconvergence, in general and using none of the usual cheats. What was produced so far by other were only local solutions valid for the particular case considered. In any case I will give him your paper, so that he knows he is working on already solved stuff :)
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    Answer to Marek: the paper you may look at is: Discrete and differential homotopy in circular restricted three-body control
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    Ah! with one single phase and a first order method then it is amazing (but it is still just the very particular CRTBP case). The trick is however the homotopy map he selected! Why this one? Any conjugate point? Did I misunderstood the title ? I solved in one phase with second order methods for the less restrictive problem RTBP or simply 3-body... but as a strict answer to your title the problem has been solved before. Nota: In "Russell, R. P., "Primer Vector Theory Applied to Global Low-Thrust Trade Studies," JGCD, Vol. 30, No. 2", he does solve the RTBP with a first order method in one phase.
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    I think what is interesting is not what he solved, but how he solved the problem. But, are means more important than end ... I dunno
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    I also loved his method, and it looked to me that is far more general than the CRTBP. As for the title of this post, OK maybe it is an exageration as it suggests that no solution was ever given before, on the other end, as Marek would say "come on guys!!!!!"
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    The generality has to be checked. Don't you think his choice of mapping is too specific? he doesn't really demonstrate it works better than other. In addition, the minimum time choice make the problem very regular (i guess you've experienced that solving min time is much easier than mass max, optimality-wise). There is still a long way before maximum mass+RTBP, Topputo et al should be re-assured :p Did you give him my paper, he may find it interesting since I mention the homotopy on mu but for max mass:)
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    Joris, that is the point I was excited abut, at the conference HE DID present solutions to the maximum mass problem!! One phase, from LEO to an orbit around the moon .. amazing :) You will find his presentation on line.... (according to the organizers) I gave him the reference to you paper anyway, but no pdf though as you did not upload it on our web pages and I could not find it in the web. So I gave him some bibliography I had with be from the russians, and from Russell, Petropoulos and Howell, As far as I know these are the only ones that can hope to compete with this guy!!
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    for info only, my phd, in one phase: http://pdf.aiaa.org/preview/CDReadyMAST08_1856/PV2008_7363.pdf I prefered Mars than the dead rock Moon though!
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    If you send me the pdf I can give it to the guy .. the link you gave contains only the first page ... (I have no access till monday to the AIAA thingy)
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    this is why I like this Diigo thingy so much more than delicious ...
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    What do you mean by this comment, Leopold? ;-) Jokes apart: I am following the Diigo thingy with Google Reader (rss). Obviously, I am getting the new postings. But if someone later on adds a comment to a post, then I can miss it, because the rss doesn't get updated. Not that it's a big problem, but do you guys have a better solution for this? How are you following these comments? (I know that if you have commented an entry, then you get the later updates in email.) (For example, in google reader I can see only the first 5 comments in this entry.)
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    I like when there are discussions evolving around entries
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    and on your problem with the RSS Tamas: its the same for me, you get the comments only for entries that you have posted or that you have commented on ...
Giusi Schiavone

The importance of stupidity in scientific research. - 10 views

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    I suggest you this easy reading ( is on a peer-reviewed scientific journal, IF = 6.14) 'We just don't know what we're doing!!!'
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    as a start of a peer reviewed paper this is an interesting first paragraph: "I recently saw an old friend for the first time in many years. We had been Ph.D. students at the same time, both studying science, although in different areas. She later dropped out of graduate school, went to Harvard Law School and is now a senior lawyer for a major environmental organization. At some point, the conversation turned to why she had left graduate school. To my utter astonishment, she said it was because it made her feel stupid. After a couple of years of feeling stupid every day, she was ready to do something else."
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    Hilarious! Mr Schwartz, who made a PhD at Stanford(!) and apparently is working as a postdoc now, has finally discovered what science is about!!! Quote: "That's when it hit me: nobody did. That's why it was a research problem." And he seems so excited about it! I think he should not only get published in 6.14 journal, but also get the Nobel Prize immediately! Seriously, after reading something like this, how one may not have superstitions about the educational system in the US?
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    I tend to agree with you but I think that you are too harsh - its still only an "essay" and one of his points of making sure that education at post graduate level is not about indoctrinating what we know already is valid ...
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    I think this quote by Richard Horton is relevant to the discussion: "We portray peer review to the public as a quasi-sacred process that helps to make science our most objective truth teller. But we know that the system of peer review is biased, unjust, unaccountable, incomplete, easily fixed, often insulting, usually ignorant, occasionally foolish, and frequently wrong." :P
LeopoldS

ACE Acronym CrEator - generate your own acronym! - 1 views

shared by LeopoldS on 07 Sep 10 - Cached
Ma Ru liked it
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    this is how they do it :-)
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    Some highlights: ACuTE: Advanced Concepts TEam ADDiCT: ADvanceD Concepts Team AbDiCaTE: ADvanced Concepts TEam wASTEd: Advanced conceptS TEam
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    But seriously, my PhD project title from now on becomes: Robotic mOdels maThematIcal Cognition (eROTIC)
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    your thesis title fits perfectly then ...
pacome delva

981.pdf (Objet application/pdf) - 6 views

shared by pacome delva on 14 Dec 09 - No Cached
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    Where do you want to go to do academic research and still have a decent salary ? certainly not sweden, France or Germany... prefer the UK, US or the top... Switzerland !
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    Where do you want to go to do academic research and still have fun? Where can you really do research instead of becoming an overpaid secretary? If you want to get rich go and work in investment banking...
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    well.. i'd better live decently than get rich... which is not possible in Paris (take 1680 euros for one family and a 1000 euros rent, minus all normal expenses (health, car, insurance, ...), it's difficult to finish the month...) Without mentioning that in France you would become an underpaid secretary...!!! My ex phd director is a professor and she doesn't even have a secretary to manage the 150 applications to the master she is in charge... My experience would rather say that the salary and the time you have for research are quite decorrelated.
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    Sure, 44k for a full professor, that's a bad joke! Just my experience from conferences: high saleries do not make good research, I rather suspect there's something like an optimal salery. People with too high saleries often seem to feel obliged to make much noise (whatever the reason might be), the result is not research but PR campagns.
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    I agree ! Just a correction, net salary for a full professor starting in France: 36456 euros/year... For a McF (equivalent junior prof.): 20160 euros/year, and of course a shitload of admistrative tasks and teaching. I don't know why i still dream to have a position...?
Francesco Biscani

Chernobyl fallout could drive evolution of 'space plants' - environment - 15 May 2009 -... - 0 views

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    Is this possibly relevant to tissue regeneration?
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    nice findings indeed ... this is one of the topics of research that I was contemplating to engage in after my PhD ...
ESA ACT

postdoc & students : science career articles on science postdocs, science PhD students ... - 0 views

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    An article about mentoring in science.
Christophe Praz

Gigantic Ocean Vortices Seen From Space Could Change Climate Models | Science | WIRED - 5 views

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    True! Half the Phd Positions offered are in studying eddy variability. It links to resolving the - yet another holy grail - problem of turbulence.
jcunha

Kilogram conflict resolved at last - 3 views

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    Apparently it's time for retirement of the Le Grand K, if all goes well until the middle of next year...
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    "One method (...) involves counting the atoms in two silicon-28 spheres that each weigh the same as the reference kilogram." Sounds like a lengthy task, but someone must keep those physics PhD students busy, I guess...
mkisantal

Reinforcement Learning with Prediction-Based Rewards - 3 views

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    Prediction-based method for encouraging reinforcement learning agents to explore their environments through curiosity (reward for unfamiliar states). Learns some games without any extrinsic reward!
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    Fun failure case: agent gets stuck in front of TV.
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    Not read this article but on a related note: Curiosity and various metrics for it have been explored for some time in robotics (outside of RL) as a framework for exploring (partially) unfamiliar environments. I came across some papers on this topic applied to UAVs when prep'ing for a PhD app. This one (http://www.cim.mcgill.ca/~yogesh/publications/crv2014.pdf) comes to mind - which used a topic modelling approach.
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