Skip to main content

Home/ Advanced Concepts Team/ Contents contributed and discussions participated by Joris _

Contents contributed and discussions participated by Joris _

Simple Middle Filter: All | Bookmarks | Topics
Joris _

SPACE.com -- Venus Probe's Problems May Cause Japan to Scale Back - 0 views

www.space.com/...suki-japan-rethink-101217.html

space MAD

shared by Joris _ on 20 Dec 10 - No Cached
  • We have to be more conservative to plan our next planetary mission, so it will never fail in any aspect."
  • the probe's initial failure will have a big impact on how JAXA plans future planetary missions
  • hew to more conservative ideas in the near future
  • Joris _ on 20 Dec 10
     
    what a shame! ambition and innovation have not been fairly rewarded ...
  • Joris _ on 20 Dec 10
     
    I didn't have time yet. But formulating the failure with a MTBF or a FIT, you can easily imagine a more robust solution. Instead of one single burn, you would make several smaller burns - It will take more time and require more fuel though. Another "robust" approach is to consider weak stability boundary capture. Again it takes time, but chances of failure are lessen.
Joris _

The Pioneer Anomaly, a 30-Year-Old Cosmic Mystery, May Be Resolved At Last | Popular Sc... - 0 views

www.popsci.com/pioneeranomaly

MAD phy pioneer

shared by Joris _ on 16 Dec 10 - No Cached
LeopoldS liked it
  • Joris _ on 16 Dec 10
     
    "After decades spent thinking, arguing, hoping, and in the words of Turyshev, "making a career off of it," these scientists' interest in the Pioneer anomaly has, understandably, accumulated psychological baggage; in the case of many of them, a cloud of emotional investment has formed around the core of objective scientific inquiry. And clouds obscure things."
  • Joris _ on 16 Dec 10
     
    165 pages about it!! http://arxiv.org/abs/1001.3686
Joris _

YouTube - Ascent - Commemorating Shuttle - 2 views

www.youtube.com/watch

MAD Space shuttle

shared by Joris _ on 13 Dec 10 - No Cached
LeopoldS and Joris _ liked it
  • Joris _ on 13 Dec 10
     
    An amazing compilation of slow motion videos of the space shuttle. Superb!
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 ...
  • Joris _ on 09 Dec 10
  • 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.
Joris _

Kinect Steers Quadrocopter Drone to Search and Destroy | Popular Science - 0 views

www.popsci.com/...t-hack-guides-uav-quadrocopter

INF MAD

shared by Joris _ on 07 Dec 10 - No Cached
  • Joris _ on 07 Dec 10
Joris _

FASTSAT performing well; launch of small satellite coming next week | al.com - 0 views

blog.al.com/...at_performing_well_launch.html

MAD Space debris

shared by Joris _ on 29 Nov 10 - No Cached
  • Being able to launch a satellite from a satellite has numerous potential benefits to the military and scientists, but those benefits depend on the smaller satellite not hitting the mother ship when it launches and going where it needs to go.If the sail can deploy as planned to its 100-square-foot size - about as big as a six-person camping tent - and can guide the smaller satellite to its planned re-entry, it would also illustrate a new way to bring satellites back to Earth and reduce orbiting space junk.
Joris _

Cyber Experts Have Proof That China Has Hijacked U.S.-Based Internet Traffic: UPDATED -... - 0 views

www.nationaldefensemagazine.org/...Post.aspx

INF

shared by Joris _ on 25 Nov 10 - No Cached
  • For 18 minutes in April, China’s state-controlled telecommunications company hijacked 15 percent of the world’s Internet traffic
  • The telephone giants of the world work on a system based on trust,
  • They also trust that this system won’t be abused.
  • Joris _ on 25 Nov 10
     
    Some issues with internet. Let's invent the future internet ...
Joris _

KodiakDailyMirror.com :: Daily newspaper of Kodiak, Alaska - 0 views

www.kodiakdailymirror.com/?pid=19&id=9333

MAD Solar Sail

shared by Joris _ on 18 Nov 10 - No Cached
  • The NanoSailD is a solar sail designed to use light particles to accelerate. If all goes well it will be the first solar sail deployed by NASA.
  • It instead uses the sail for the humble but important mission of testing a potential orbit-cleaning tool.
Joris _

American Institute of Aeronautics and Astronautics - New Horizons Challenge - 5 views

www.aiaa.org/content.cfm

shared by Joris _ on 16 Nov 10 - No Cached
Juxi Leitner liked it
  • Joris _ on 16 Nov 10
     
    the ACT should participate, a least someone in it, ...
Joris _

LaTeX Search - Mathematical Equations in Scientific Publications. - 2 views

www.latexsearch.com/home.do

maths

shared by Joris _ on 10 Nov 10 - No Cached
LeopoldS liked it
  • Joris _ on 10 Nov 10
     
    can be helpful ... but also very tricky. There are so many ways to write the same equation...
Joris _

Cross-section of innovators discusses the future at TEDxNASA - dailypress.com - 2 views

www.dailypress.com/...-tedx-20101104,0,1840857.story

TED

shared by Joris _ on 05 Nov 10 - No Cached
  • Joris _ on 05 Nov 10
     
    hmmm, we could have done something! ... http://www.tedxnasa.com
Joris _

Obama's dream of Mars at risk from radiation - physicsworld.com - 0 views

physicsworld.com/...44254

mars technology

shared by Joris _ on 05 Nov 10 - No Cached
  • Schwabe cycle
  • Schwabe cycle, where sunspot numbers reach a peak roughly once every 11 years
  • the intensity of each solar maximum is also thought to oscillate over a period, called the Gleissberg cycle
  • ...3 more annotations...
  • The worse-case scenario is that if you radiate a crew sufficiently, they'd all succumb to radiation sickness within a few days and essentially vomit and diarrhoea themselves to death within an enclosed capsule
  • The Moon missions were just blind lucky,” explains Lewis Dartnell, an astrobiologist at University College, London. “The astronauts would have experienced radiation sickness and a higher risk of future cancer if they'd been hit,” he adds.
  • Hapgood and colleagues are currently working on an alternative technique that involves surrounding the spacecraft with a plasma shield to deflect incoming protons without creating secondary radiation
« First ‹ Previous 61 - 80 of 251 Next › Last »
Showing 20▼ items per page