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Articles by Gregory J. Gbur
INVISIBILITA': STORIA E SCIENZA DEL NON ESSERE VISTI
E' possibile diventare realmente invisibili? Si può scomparire del tutto, come in un film di fantascienza? Per rispondere a questa domanda dobbiamo partire dal principio, riflettendo innanzitutto sul significato di invisibilità, poi bisogna ripercorrere la "storia e scienza del non essere visti", esattamente come fa Gregory J. Gbur nel libro "Invisibilità", pubblicato da Apogeo editore nel mese di febbraio 2024.
Optics & Photonics News - Invisibility: The History and Science of How Not to Be Seen
This book may be seen as a Trojan Horse—a way to teach physics (in particular optics) without seeming to do so. Taking on a fascinating topic (invisibility), the author packs an incredible number of optics concepts into a text that reads almost like a detective novel. To solve the mystery of how objects or people could become invisible, the reader goes on a learning quest exploring optical laws, properties and materials.
Book Review: ‘Invisibility,’ by Gregory J. Gbur
Book Review|If You Could Have One Superpower … https://www.nytimes.com/2023/04/16/books/review/invisibility-gregory-gbur.html Nonfiction In “Invisibility,” the professor of physics and optical science Gregory J. Gbur examines the past and future of everyone’s favorite plot device. Send any friend a story As a subscriber, you have 10 gift articles to give each month. Anyone can read what you share. Invisibility and its possibilities have fascinated humans for millenniums.Credit...via The J.
Semi-analytic simulation of optical wave propagation through turbulence
Abstract Split-step wave-optical simulations are useful for studying optical propagation through random media like atmospheric turbulence. The standard method involves alternating steps of paraxial vacuum propagation and turbulent phase accumulation. We present a semi-analytic approach to evaluating the Fresnel diffraction integral with one phase screen between the source and observation planes and another screen in the observation plane.
O insolucionável mistério da física: por que os gatos caem sempre de pé?
Como os gatos conseguem cair sempre em pé? Esse é um quebra-cabeças que deveria ser fácil de resolver, mas tem tomado muito tempo dos físicos e ainda precisa ser extensivamente estudado.
El inacabable misterio físico de por qué los gatos siempre caen de pie
¿Cómo se las ingenian los gatos para siempre caer de pie? Se trata de un rompecabezas que debería ser fácil de resolver, pero a los físicos les ha tomado mucho tiempo y aún hay cosas que podemos aprender sobre esta forma de caer de los gatos. Los intentos por dar una explicación científica a esta habilidad, comúnmente conocida como reflejo de enderezamiento del gato, son casi tan viejos como el propio estudio de la física.
Gallant Galactic Geeky Gift Guide 2019
It is hard to believe that it is now time for my second annual Gallant Galactic Geeky Gift Guide! This year, I have several gift ideas for you to peruse. ART: Art of Sara Richard: You may recognize the ethereal style of Ms. Richard from her work on Jem and the Holograms, My Little Pony, and many other genre favorites. Buy her phenomenal art, pins, and more on her site. CLOTHING and ACCESSORIES: Geometric Backpack, which I used for San Diego Comic-Con Ready for Day 1! San Diego Comic-Con Day 1.
Studying the Light of the Eclipse
Solar eclipses, like the one crossing the United States on August 21, have long been rare opportunities for scientists to explore phenomena that are usually obscured by the Sun’s brightness. For example, the solar corona, the glowing aura of plasma that surrounds the Sun, is easily viewed even with the naked eye during an eclipse, and such events have long been an ideal chance to study the corona in detail.
Invisibility
Description Praise A lively exploration of how invisibility has gone from science fiction to fact Is it possible for something or someone to be made invisible? This question, which has intrigued authors of science fiction for over a century, has become a headline-grabbing topic of scientific research. In this book, science writer and optical physicist Gregory J. Gbur traces the science of invisibility from its sci-fi origins in the nineteenth-century writings of authors such as H. G.
Going Rogue with Optical Waves in the Laboratory
New optical research suggests that rogue waves, which can be higher than a 10-story building in the ocean, can form more easily than once thought. For generations, sailors have told stories of gigantic, ship-breaking waves appearing seemingly out of nowhere, even in calm seas. Such waves, now known as rogue waves, did not come to the attention of science until New Year’s Day 1995, when a massive 60-foot wave slammed into the Draupner natural gas platform off of Norway’s coast.
A Protective Cloak Against Earthquakes and Storms
This Article From Issue September-October 2015 Volume 103, Number 5 Almost a decade ago, the first scientific research on optical invisibility cloaking was unveiled, but in spite of a furious amount of theoretical and experimental effort, there are still numerous obstacles to overcome before a Klingon or Harry Potter–style cloaking device comes even close to reality. Indeed, serious theoretical limitations indicate that such devices may not ever be possible, even in principle.
A Glimpse of Infinity In the Swirling of Light
What is the meaning of the word infinity? Metaphorically, it has always represented something unattainable, something that does not exist in our mundane reality: always larger than the largest thing imaginable. This is also true in modern physics, where early concepts of a universe infinite in both space and time were replaced by a rapidly expanding but finite cosmos birthed in the Big Bang. Nothing in physics, it would seem, is infinite after all.
Audio: Seeing Biology's Tiniest in Color
How do you see the color of objects that are smaller than the smallest wavelength of visible light? What does color even mean for objects so small? We see color because when light strikes an object some of the visible spectrum is reflected back to our eyes. The wavelengths of those colors of the rainbow start around 390 nanometers (violet) and go to about 700 nanometers (red).
A Glimpse of Infinity In the Swirling of Light
If the doors of perception were cleansed every thing would appear to man as it is, Infinite. For man has closed himself up, till he sees all things thro’ narrow chinks of his cavern. —William Blake, “The Marriage of Heaven and Hell” (1793) What is the meaning of the word infinity? Metaphorically, it has always represented something unattainable, something that does not exist in our mundane reality: always larger than the largest thing imaginable.
Debriefing the EuroScience Open Forum 2016
Gregory J. GburMar 9, 2016Infinite mathematics, long thought to be impossible to observe, manifests in optical vortices. Dianne TimblinJul 20, 2015When the Apollo 11 astronauts landed on the Moon, we knew what it meant for science. We also knew what it meant for Cold War–era politics. But what did it mean for the arts? Would poets ever look at the Moon in the same way again?
Particle Colliders on the Horizon
On June 3rd, 2015: At the same time that the Large Hadron Collider (LHC) successfully starts colliding protons at its maximal design energy, I’m 4,000 miles away packing my bags in preparation to visit CERN, the home of the LHC and the Mecca of particle physics. Fast forward a week and I’m sitting among 300 fellow enthusiastic young particle physicists in the iconic CERN auditorium where the discovery of the Higgs Boson was announced only three years prior.
A Protective Cloak Against Earthquakes and Storms
Invisibility cloaking is not close on the horizon, but shielding from other types of damaging waves may be more feasible. It’s still a debate as to whether a Star Trek style optical cloaking device—something that alters light reflection to render something invisible—would ever be physically possible. But surfaces that alter waves other than those of light—such as ones of water, sound, or even seismic activity—could be close to reality.
8 Myths About Public Understanding of Science
A little over a week ago, the Pew Research Center came out with new poll data showing what pretty much everyone already knows: The general public continues to debate particular scientific ideas on which most scientists already agree, including the reality of human-caused climate change, the necessity of requiring an MMR vaccination, and the validity of evolutionary theory. Pew’s data have sounded the latest call for increased attention to public understanding of science.
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