Toward a Type 1 civilization Our civilization is fast approaching a tipping point. Humans will need to make the transition from nonrenewable fossil fuels as the primary source of our energy to renewable energy sources that will allow us to flourish into the future. Failure to make that transformation will doom us to the endless political machinations and economic conflicts that have plagued civilization for the last half-millennium. We need new technologies to be sure, but without evolved political and economic systems, we cannot become what we must. And what is that? A Type 1 civilization. In a 1964 article on searching for extraterrestrial civilizations, the Soviet astronomer Nikolai Kardashev suggested using radio telescopes to detect energy signals from other solar systems in which there might be civilizations of three levels of advancement: Type 1 can harness all of the energy of its home planet; Type 2 can harvest all of the power of its sun; and Type 3 can master the energy from its entire galaxy.
Fluid Simulator Check out my blog! E-mail: kotsoft@gmail.com Fluid Instructions: You can drag the fluid around with your mouse and adjust the sliders at the top to change the properties of the fluid in real-time. Check out my newest app: Grantophone! More cool demos! Please enable JavaScript to view the <a href=" About This is my implementation of the Material Point Method. For interpolation, I use the quadratic B-spline presented here: Analysis and Reduction of Quadrature Errors in the Material Point Method. Instead of integrating the density over time (which is what most of the MPM papers do), I do a density summation every frame. Material Parameters Some of these parameters are hard to explain in one or two sentences (and a couple I made up) so I'll also link you to their corresponding Wikipedia pages. Density - Target density for the particles. Stiffness - How compressible the fluid is. Bulk viscosity - Kind of like damping. Gravity - How much the particles will accelerate downwards.
Astrobiology: Life in the Universe NAI Director’s Seminar Series: Victoria Orphan Victoria Orphan. Credit: mbari.orgVictoria Orphan, Professor of Geobiology at the California Institute of Technology, will be presenting the next NAI Director’s Seminar on April 21, 2014, at 11AM PDT. Orphan is a specialist in molecular microbial ecology. She studies anaerobic microbial communities involved in carbon, nitrogen, and sulfur cycling. The title of her talk is “Methane-Based Life in a Deep-Sea Concrete Jungle.” An example of wrinkle mats at the Dresser Formation. An Atlas of The Universe Fuck Yeah Fluid Dynamics Reader isotropicposts writes: Hi, I’m taking a fluids class and I’m not sure I understand the whole lagrangian-eulerian measurements of velocity and acceleration. Could you explain this? This is a really great question because the Eulerian versus Lagrangian distinction is not obvious when you first learn about it. If you think about a fluid flowing, there are two sensible reference frames from which we might observe. The first is the reference frame in which we are still and the fluid rushes by. The other way to observe fluid motion is to follow a particular bit of fluid around and see how it evolves. In the end, both reference frames contain the same physics (Einstein would not have it any other way), but sometimes one is more useful than the other in a given situation.
Société Française d'Exobiologie - Site Officiel Chronology of the universe Illustration of evolution of the universe from the Big Bang (left). In this diagram, the universe is represented in two dimensions and the third (horizontal) dimension is time, increasing to the right. Summary[edit] The very earliest universe was so hot, or energetic, that initially no particles existed or could exist (except perhaps in the most fleeting sense), and the forces we see around us today were believed to be merged into one unified force. In the second phase, this quark–gluon plasma universe then cooled further, the current fundamental forces we know take their present forms through further symmetry breaking – notably the breaking of electroweak symmetry – and the full range of complex and composite particles we see around us today became possible, leading to a gravitationally dominated universe, the first neutral atoms (~ 80% hydrogen), and the cosmic microwave background radiation we can detect today. Very early universe[edit] Planck epoch[edit] Grand unification epoch[edit]
civilisations extraterrestres Civilisations extraterrestres Retour Accueil Dossiers Qu’est-ce qu’une civilisation ? Le terme de civilisation est une notion d'une très grande complexité qui peut revêtir plusieurs acceptions et concerner des réalités très différentes. D’une façon générale le mot civilisation peut avoir trois significations différentes. 1) La première relève du langage courant, et le terme de civilisation est alors associé à un jugement de valeur. 2) La seconde signification définie la civilisation comme un aspect de la vie sociale, ou comme l’ensemble des phénomènes sociaux représentés par la religion, la morale, l’art, la science et la technique. 3) Enfin, avec la troisième signification, le mot civilisation s’applique à un ensemble de peuples ou de sociétés organisées qui occupent une aire géographique identifiable, et dont l’existence se déploie dans la durée. Document 1 : à gauche, la pyramide de Khéphren, haute de 143,50 mètres, et à droite le Sphynx. Etymologie. La fin de la civilisation.