Upload log

Below is a list of the most recent file uploads. See the gallery of new files for a more visual overview.

• 11:25, 26 July 2026 Lwcamp talk contribs uploaded File:Warp shift.png (The shift vector of a warp geometry, in red. At the edges there is no shift. At the center (inside the warp bubble) there is a region of uniform shift so that at a later time the inside of the warp bubble is rigidly translated to different spatial coordinates (in blue). The two foliations remain the same distance apart, because warp drives maintain a unit lapse function.)
• 11:25, 26 July 2026 Lwcamp talk contribs uploaded File:Lapse shift.png (A coordinate grid of space-time into slices of constant time coordinates (grey). At a point (black circle), the lapse function (yellow) shows how far into the future that point will be projected in a unit amount of proper time experienced by an observer initially at the point. The shift vector (red) shows how that point changes coordinates after the unit amount of proper time. The cyan vector shows the new coordinates the point is projected onto. The lower black surface indicates a set of poi...)
• 10:22, 7 March 2026 Lwcamp talk contribs uploaded File:Natario warp drive horizons.png
• 22:45, 6 March 2026 Lwcamp talk contribs uploaded File:Natario drive flow of space.png
• 22:10, 6 March 2026 Lwcamp talk contribs uploaded File:Expansion of Alcubierre drive.png
• 22:10, 6 March 2026 Lwcamp talk contribs uploaded File:Energy magnitude of Alcubierre drive.png
• 10:15, 4 March 2026 Lwcamp talk contribs uploaded a new version of File:Curvature hyperbolic.png
• 10:07, 4 March 2026 Lwcamp talk contribs uploaded File:Curvature hyperbolic.png (A diagram showing how a circle of a given radius has a larger circumference and area in a hyperbolic geometry than a flat geometry.)
• 10:05, 4 March 2026 Lwcamp talk contribs uploaded File:Curvature spherical.png (A diagram showing how a circle of a given radius has a smaller circumference and area in a spherical geometry than a flat geometry.)
• 20:23, 4 December 2025 Lwcamp talk contribs uploaded File:Black hole Kerr.png (A diagram of the features of the Kerr geometry, showing the inner and outer event horizons (white ovals), outer boundary of the ergosphere (outer red oval), inner surface of infinite redshift (inner red oval) and ring singularity(dotted oval).)
• 20:17, 4 December 2025 Lwcamp talk contribs uploaded File:Black hole Reissner-Nordstrom.png (A diagram of the features of the Reissner–Nordström geometry, showing the inner and outer event horizons (white solid circle), the location of the Schwarzschild event horizon for a black hole of equal mass but no charge (outer dashed circle), the location of the extremal horizon at half the Schwarzschild radius (inner dashed circle), and the central singularity.)
• 19:52, 4 December 2025 Lwcamp talk contribs uploaded File:Black hole Schwarzschold.png (A diagram of the features of the Schwarzschild geometry, showing the event horizon (white circle) and central singularity.)
• 20:04, 26 November 2025 Lwcamp talk contribs uploaded File:Comparison of the recoil of conventional and electromagnetic cannon.png (A comparison of the recoil impulse from a powder gun (green), electromagnetic gun (red), and a powder gun with a muzzle brake (blue) for a constant-energy launch (varying the mass of the projectile with speed to keep the total kinetic energy constant). Data from Edward M. Schmidt, "Comparison of the recoil of conventional and electromagnetic cannon", Shock and Vibration 8 (2001) 141–145 https://doi.org/10.1155/2001/590948)
• 11:20, 12 August 2025 Lwcamp talk contribs uploaded File:Filamentation Kautz J Appl Phys 130 203302 2021.png (Laboratory-produced laser filament produces a plasma for laser induced breakdown spectroscopy. Credit: Elizabeth J. Kautz, Mark C. Phillips, and Sivanandan S. Harilal, "Laser-induced fluorescence of filament-produced plasmas", Journal of Applied Physics <b>130</b>, 203302 (2021); doi: 10.1063/5.0065240)
• 20:27, 16 April 2024 Lwcamp talk contribs uploaded a new version of File:Field from parallel wires.png
• 15:45, 16 April 2024 Lwcamp talk contribs uploaded a new version of File:Helical railgun.png
• 13:17, 16 April 2024 Lwcamp talk contribs uploaded File:Helical railgun.png (Diagram of the internals of a helical railgun. The stator, including the rails and the helical winding, are on the left and form a barrel (covered with a mechanical support to withstand the forces of firing). The full projectile is shown on the right bottom, and the active portions of the electrical system of the projectile at top right.)
• 18:33, 15 April 2024 Lwcamp talk contribs uploaded File:Keplerian orbit ground impulse.png (Launch with an impulse delivered only at ground level puts a payload on an orbital trajectory that will always intersect the ground.)
• 10:48, 13 April 2024 Tshhmon talk contribs uploaded File:F15asm.png (F-15 ASM-135 launch Paul E. Reynolds (USAF))
• 13:33, 12 April 2024 Tshhmon talk contribs uploaded a new version of File:Laser-microchannel experiment.jpg
• 13:24, 12 April 2024 Tshhmon talk contribs uploaded File:Laser-microchannel experiment.jpg (A laser microchannel experiment. A relativistically intense laser is shot at so-called "microchannel array" targets that have ultratiny tubes that experimenters try and get the beam down. Crazy physics then proceeds to happen with high-energy electrons, lots of THz and lots of x-rays made.)
• 12:56, 11 April 2024 Tshhmon talk contribs uploaded File:Astronomycosmology.png
• 09:34, 4 April 2024 Lwcamp talk contribs uploaded File:Railgun projectile sabot separation 2.jpg (The sabot separates from a hypervelocity railgun dart immediately after launch.)
• 13:03, 3 April 2024 Lwcamp talk contribs uploaded a new version of File:Hypervelocity projectile impact test.png
• 12:56, 3 April 2024 Lwcamp talk contribs uploaded File:Hypervelocity projectile impact test.png (Test of a railgun-fired hypervelocity projectile penetrating a series of metal plates.)
• 12:46, 3 April 2024 Lwcamp talk contribs uploaded File:Railgun projectile sabot separation.png (The sabot separates from a hypervelocity railgun dart immediately after launch.)
• 12:36, 3 April 2024 Lwcamp talk contribs uploaded File:HVP shrapnel separation.png (A bursting charge disperses shrapnel sub-projectiles in a test of a railgun hypervelocity projectile.)
• 12:01, 3 April 2024 Lwcamp talk contribs uploaded File:Hypervelocity projectile.png (BAE Systems railgun hypervelocity projectile, with (left) and without (right) its sabot. Images from Congressional Research Service report R44175, cropped, flipped, and rotated. https://crsreports.congress.gov/product/pdf/R/R44175/77)
• 11:41, 3 April 2024 Lwcamp talk contribs uploaded File:Railgun projectile 2.png (Credit: Laura Guerin Source: cK-12 Foundation License: [https://creativecommons.org/licenses/by-nc/3.0/ CC BY-NC 3.0])
• 11:40, 3 April 2024 Lwcamp talk contribs uploaded File:Railgun projectile 1.jpg (Reference: Fair, H. “Transitioning EM Railgun Technology to the Warfighter.” The University of Texas at Austin, May 2007.)
• 09:06, 3 April 2024 Lwcamp talk contribs uploaded File:EMRG prototype.png (BAE prototype EMRG (electromagnetic railgun) prototype deomnstrator. Image from Congressional Research Service report R44175 https://crsreports.congress.gov/product/pdf/R/R44175/77)
• 09:01, 3 April 2024 Lwcamp talk contribs uploaded File:Naval Electromagnetic Railgun.png (General Atomics prototype EMRG (electromagnetic railgun) prototype. Image from Congressional Research Service report R44175 https://crsreports.congress.gov/product/pdf/R/R44175/77)
• 08:35, 3 April 2024 Lwcamp talk contribs uploaded File:Railgun Firing Projectile.jpg (Star Wars research: a railgun (Electromagnetic Launcher) fires a 0. 3 pound plastic projectile at 3 kilometers per second (7, 000 miles per hour) to completely penetrate a 1-inch steel target plate. The railgun is being developed at Maxwell Laboratories Inc. , San Diego, California, as part of the U. S. Government's research programme into space-based weapons capable of intercepting ballistic missiles - the Strategic Defense Initiative. Railguns use electromagnetism to accelerate a projectile...)
• 08:24, 3 April 2024 Lwcamp talk contribs uploaded File:Electromagnetic gun fire.jpg (An electromagnetic railgun is fired at 10.64 megajoules with a muzzle velocity of 2,520 meters per second at Naval Surface Warfare Center, Dahlgren, Va., Jan. 31, 2008. Credit: U.S. Department of Defense https://www.defense.gov/Multimedia/Photos/igphoto/2001982027/)
• 14:12, 1 April 2024 Lwcamp talk contribs uploaded a new version of File:Railgun simplified.png
• 11:47, 31 March 2024 Lwcamp talk contribs uploaded a new version of File:Railgun simplified.png
• 11:45, 31 March 2024 Lwcamp talk contribs uploaded File:Railgun simplified.png (A simplified diagram showing the workings of a railgun. The current flowing through the rails produces a magnetic field that pushes on the current flowing through the projectile, propelling down the rails.)
• 11:18, 31 March 2024 Lwcamp talk contribs uploaded File:Lorentz force current magnetic.png (The force on a current due to a magnetic field.)
• 11:17, 31 March 2024 Lwcamp talk contribs uploaded File:Field from parallel wires.png (The magnetic field (magenta) circulating around a cross sectional plane perpendicular to the direction of two infinite line of current in the opposite directions (green).)
• 11:17, 31 March 2024 Lwcamp talk contribs uploaded File:Amperes circuit law.png (The magnetic field (magenta) circulating around a cross sectional plane perpendicular to the direction of an infinite line of current (green).)
• 17:24, 15 March 2024 Lwcamp talk contribs uploaded File:Electrostatic active shielding 2.png (Geometry optimized electrostatic shield design with negatively charged rods and positively charged plates. Design from Rajarshi Pal Chowdhury, Luke A. Stegeman, Matthew L. Lund, Dan Fry, Stojan Madzunkov, and Amir A. Bahadori, "Hybrid methods of radiation shielding against deep-space radiation", Life Sciences in Space Research, Volume 38, 2023, Pages 67-78, ISSN 2214-5524, https://doi.org/10.1016/j.lssr.2023.04.004.)
• 14:10, 15 March 2024 Tshhmon talk contribs uploaded File:Ltwormhole.jpg ([https://www.youtube.com/watch?v=SuJ-2nTvAWo Still from a raytraced simulation of a long-throated wormhole, by Pablo Antonio Cano (YT).])
• 09:12, 14 March 2024 Lwcamp talk contribs uploaded File:Magnetic shielding Halback Array.png (A spacecraft with a Halback array for a shield. A Halback array is a sequence of magnets each rotated by 90 degrees from the previous, so that their fields add on one side and cancel on the other. By making the field cancel in the interior of the Halback ring, the habitation module can be kept relatively field-free. The magnetic fields are shown in magenta and the current loops in green. Design from Paolo Desiati and Elena D'Onghia, "CREW HaT: A Magnetic Shielding System for Space Habitats",...)
• 21:05, 13 March 2024 Lwcamp talk contribs uploaded File:Plasma shield.png (A habitation module with a plasma shield. The section in in the shape of a torus, as is necessary for hybrid shielding but which also conveniently allows spin gravity. Superconductive cables under the hull hull carry high electric currents (shown in green) which make a magnetic field (shown in magenta) that cancels in the interior but adds outside the ring. The fields confine a cloud of electrons (shown in yellow) outside of the habitat. The habitat itself carries a high positive electric cha...)
• 18:33, 2 March 2024 Lwcamp talk contribs uploaded File:Elctrostatic active shielding.png (One proposed design for a deployable elctrostatic shield, using thin conductive "balloons" that "inflate" into spheres once charged. Ram K. Tripathi, John W. Wilson, and Robert C. Youngquist, "Electrostatic Active Radiation Shielding - Revisited", 2006 IEEE Aerospace Conference, Big Sky, MT, USA, 2006, pp. 9 pp.-, doi: 10.1109/AERO.2006.1655760.)
• 16:18, 2 March 2024 Lwcamp talk contribs uploaded File:Racetrack magnetic active shielding.png (A spacecraft with the magnetic shield entirely confined inside a structure (in this case, the design is known as the "racetrack" configuration). Electric currents are shown in green, the magnetic field in magenta, and an example track of a radiation particle is in red.)
• 16:17, 2 March 2024 Lwcamp talk contribs uploaded File:Unconfined FRC magnetic active shielding.png (A spacecraft shielded with an unconfined magnetic field, created by two simple current loops (green) with the resulting magnetic field shown in magenta.)
• 09:42, 27 February 2024 Lwcamp talk contribs uploaded File:Relativistic travel radiation penetration depth.png (Stopping distance of protons in titanium and living tissue as a function of speed <math>\beta=v/c</math> relative to light speed. Oleg G. Semyonov, "Radiation Hazard of Relativistic Interstellar Flight", https://arxiv.org/pdf/physics/0610030)
• 09:30, 27 February 2024 Lwcamp talk contribs uploaded File:Relativistic travel unshielded dose rate.png (The rate at which an unshielded individual will take radiation dose as a function of speed <math>\beta=v/c</math> relative to light speed. Oleg G. Semyonov, "Radiation Hazard of Relativistic Interstellar Flight", https://arxiv.org/pdf/physics/0610030)
• 17:12, 25 February 2024 Lwcamp talk contribs uploaded File:SEP shielding.png (Relative dose of solar energetic particles as a function of thickness of aluminum and polyethylene shielding L.W. Townsend, J.H. Adams, S.R. Blattnig, M.S. Clowdsley, D.J. Fry, I. Jun, C.D. McLeod, J.I. Minow, D.F. Moore, J.W. Norbury, R.B. Norman, D.V. Reames, N.A. Schwadron, E.J. Semones, R.C. Singleterry, T.C. Slaba, C.M. Werneth, M.A. Xapsos, "Solar particle event storm shelter requirements for missions beyond low Earth orbit", Life Sciences in Space Research, Volume 17 (2018), Pages 32-...)