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  1. pioneerboy

    Wind flow experiments

    I'd like to experimentally simulate air flow turbulences around obstacles. Building the obstacles in one thing, but providing a well characterised flow (and mix it with something visible like smoke...) is something else. In general, I think the whole idea is easier to acomplish compared to fluid...
  2. pioneerboy

    Electronics Alarm clock DIY

    I'd like to build my own reliable alarm clock, but I don't have any knowledge in electronics and no fancy equipment, only some humble C programming experience. What do I need and what do I need to know to build one myself. Thanks very much.
  3. pioneerboy

    A Climate change and changes in astronomical viewing conditions...

    I'd like to read some articles, papers, or whatever scientific there is about the prospects and impacts of climate change for professional ground based astronomy and observatory sites. In particular, which locations which are now among the most suitable sites for observatories - especially...
  4. pioneerboy

    Stargazing A telescope for asteroids

    Sorry for the misunderstanding. I thought we unwrittenly agree to the same optical design instead of comparing between different designs. Still, for a given design I'd first like to see...
  5. pioneerboy

    Stargazing A telescope for asteroids

    But you just confirm my general statement that faster optics have larger central obstructions: F5 => 52%, and F7 => 48% obstruction. The faster F5 has a 4% larger obstruction. I've never come across any telescope design that from Newton to RC where the faster scope has a smaller obstruction. If...
  6. pioneerboy

    Stargazing A telescope for asteroids

    There are two aspects: 1. the larger obstruction makes the light gathering area smaller for a faster scope, 2. the faster scope reaches a specific magnitude in a shorter exposure time. What you say is that aspect 1 weights more than aspect 2. Intuitively, I'd agree for insanely large...
  7. pioneerboy

    Stargazing A telescope for asteroids

    Can you go a little bit more into detail what you mean exactly with your last sentence, please? Do you have Modulation Transfer Function and Contrast in mind or under which keywords can I find the explanation to the phenomenon you mention here?
  8. pioneerboy

    I Where's Astrogeology heading?

    Thanks for the input. What would be of greater benefit concerning planetary sciences and telescopes: a vocational education electronics or precision optics?
  9. pioneerboy

    Stargazing A telescope for asteroids

    Would such a telescope be useful for discovering new main belt asteroids: http://www.officinastellare.com/products_scheda.php?idProd=29 [Broken]
  10. pioneerboy

    I Where's Astrogeology heading?

    I dropped out of physics in college and have several career choices now for the near future being all vocational. In the far future I want to end up in planetary sciences again. So, I'll want to work again with planetesimals, dwarf planets, evolution of planets, their geology, and astrobiology...
  11. pioneerboy

    EM length of gravitational waves

    Maybe a stupid question and maybe sensless to ask, but as I don't know, I ask anyway: what is the length of the newly found gravitational waves in terms of traditional EM wavelengths?
  12. pioneerboy

    Nobel prize for Brown and Batygin?

    If hypothesised planet nine is really discovered in the outskirts of our Solar system, will M. E. Brown and K. Batygin have a chance to win the Nobel prize in physics or is this too much of an old hat for the Nobel-commitee?
  13. pioneerboy

    Scientific publishing from the "afterlife"?

    I did not know this is possible...what a kindergarten! When I read a paper I expect and want all authors to have participated directly, at least to some extend or some period, in the paper's research - for me that's just logical. Honoring, praises, funny statements (I also came across those)...
  14. pioneerboy

    Scientific publishing from the "afterlife"?

    My point is how can someone be a coauthor of a paper when he/she is long gone and the research in the paper almost certainly was not conducted by this person anymore while still alive? When he/she participated in the paper's research then it's clear and one makes a respective footnote about...
  15. pioneerboy

    Scientific publishing from the "afterlife"?

    How long after a scientist's death can papers be published with this very scientist as coauthor? I assume this is the case for all scientific work where he or she participated to such a degree that justifies listing as coauthor...living or dead. But there's a case that got me wondering. I read...
  16. pioneerboy

    The dog's game

    Although not having posted anything, I would like to write that I am pleased that my question also is of interests to others and that got you all into this discussion - unfortunately, with crossed wires about the meta-discussion about the nature of mathematical proofs...but at least these...
  17. pioneerboy

    The dog's game

    Sure. It's very easy and does not require literal translation. You have 9 cards showing the front or back of 4 different dogs. The cards must be layed and turned so that all fronts and backs that do not touch the 9x9 card's corners or edges are complete in the sense that they match the same dog...
  18. pioneerboy

    The dog's game

    Is there a solution to this game https://prlbr.de/2011/08/hundepuzzle/alle-karten.png in the form of an equation that only requires high school mathematics but no higher maths and informatics?
  19. pioneerboy

    I How to determine an asteroid survey efficiency?

    Btw, an efficiency characterisation as in Fig.2 http://web.gps.caltech.edu/~mbrown/papers/ps/kbodeep.pdf would be great. If only there were a way around this artificial stuff and a more "amateur astronomical" approach without large amounts of GB Rams or CPUs.
  20. pioneerboy

    I How to determine an asteroid survey efficiency?

    What it does is to look up the orbital elements/epoch ephemerides of all objects that were in/around the image you took; so you basically know where to look for known ones without blink-comparing. What you have to do now is to investigate each object and select the appropriate object candidate...
  21. pioneerboy

    I How to determine an asteroid survey efficiency?

    I read in a couple of papers about asteroid hunting that they used artificially implemented asteroids in real images to see if their detection algorithms could find them. This way, the scientists determined their asteroid survey efficiency in real data. As I don't have the resources to work so...
  22. pioneerboy

    Aerospace prospects of EE/ME

    And it would not help to do the ME lectures "thermodynamics" and "fluid dynamics" in addition to the curriculum of EE?
  23. pioneerboy

    Aerospace prospects of EE/ME

    Ah, ok. Actually, I'm most interested in propulsion...so probably fluid dynamics. An additional question if you allow: I have a half finished physics undergraduate in my pocket (had to quit, but the credits might be useful for something[?])...if I study now EE (because it allows me to build...
  24. pioneerboy

    Aerospace prospects of EE/ME

    Hello there, I have a few questions concerning how the choice between electrical and mechanical engineering influences one's future career if going into the aerospace branch - if possible at all. Can you do a Master or graduate in aerospace engineering with an undergraduate degree in one or the...
  25. pioneerboy

    Lunar and Planetary Laboratory vs. Steward Observatory

    So, if I understand this right based on the Wiki articles, the LPL is a planetary sciences institute embracing all kinds of science disciplines and subdisciplines from physics, chemistry, meteorology, geology, biology to study solar system objects with their own built space instruments. So it's...
  26. pioneerboy

    Profession of Dr. Emmett "Doc" Brown

    Hi there, If you look through the trilogy of "Back to the Future" you come across many devices of Doc Brown. He's officially a physicist with theoretical knowledge, he's always claiming to conducting experiments, and he's great in building things...obviously. First question: what branch of...
  27. pioneerboy

    Electromagnetic levitation

    Yes, but if we want the object to be controlled in 6 axes of freedom and on a micrometer scale. I have no experience at all with all this and what kinds of stuff would have to be attached to the object, but lets assume it would weight about a pound at most. How about the feasibility here?
  28. pioneerboy

    Electromagnetic levitation

    Hi there, I am thinking about an electromagnetic levitation project. Imagine a tube of about 13cm diameter with a flat rotation-symmetrical object of maybe 4cm diameter at one of its ends. The object should be oriented always perpendicular to the vertical tube...difficult to explain as I don't...
  29. pioneerboy

    Engineering From mechanical to optical engineering

    Hi there, Is it easily possible to change to optical engineering for the MSc and being involved in big telescope constructions after getting a BSc degree in mechanical engineering? Lucius
  30. pioneerboy

    Lunar and Planetary Laboratory vs. Steward Observatory

    Hi there, The University of Arizona has these two institutes (among many others, of course): - Lunar and Planetary Laboratory, LPL for short - Steward Observatory As far as I understand, both are into space research and astronomy. If I wanted to join either one or the other, I would have no...
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