Scientists have developed a dual-laser Brillouin optical correlation-domain reflectometry (BOCDR) system that uses two frequency-modulated lasers. By scanning the relative modulation phase between the pump and reference lasers, the setup measures strain and temperature all along an optical fiber. In a proof-of-concept test on a 13-meter silica fiber, the team recorded Brillouin gain spectra (BGS) at only about 200 MHz—over 50 times lower than the usual 11 GHz band.
The research was published in the Journal of Physics: Photonics on April 25, 2025.
“The dual-laser approach makes BOCDR equipment simpler, more cost-effective, and easier to deploy, giving engineers a practical tool for long-term structural health monitoring, factory process control, and many other sensing tasks,” said senior author Associate Professor Yosuke Mizuno of Yokohama National University.
Medieval alchemists dreamed of transmuting lead into gold. Today, we know that lead and gold are different elements, and no amount of chemistry can turn one into the other.
But our modern knowledge tells us the basic difference between an atom of lead and an atom of gold: the lead atom contains exactly three more protons. So can we create a gold atom by simply pulling three protons out of a lead atom?
The study presents new evidence that infants are capable of learning words solely through exposure to language. Human language enables us to learn the meanings of words for things we’ve never directly experienced. We do this effortlessly in everyday conversation, often using context to infer the me
A new study combining satellite imagery with genetic analysis reveals that climate and land use changes are driving increased vegetation growth in Europe’s mountain regions, ultimately leading to a decline in the genetic diversity of medicinal plants such as Greek mountain tea. Mountain regions a.
A bold new quantum theory of gravity may finally bridge the long-standing rift between Einstein’s general relativity and quantum field theory. This potential “Theory of Everything” could answer some of the deepest mysteries in science—from black hole singularities to the origins of the universe—w
A mathematician has developed an algebraic solution to an equation that was long thought to be unsolvable. A groundbreaking discovery from a UNSW Sydney mathematician may finally offer a solution to one of algebra’s toughest problems: how to solve high-degree polynomial equations. Polynomials
Crystals are not alive, yet they grow, form complex structures, and even conduct electricity. Could life emerge from crystals rather than carbon-based molecules? Explore the intriguing possibility of crystal-based lifeforms, the challenges they would face, and the conditions where they might thrive. We journey to five exotic worlds—Vulcan, Ribbon World, Longenacht, Telluride, and Tempest—each offering unique environments where crystalline life might take hold. Could such life develop naturally, or might humanity one day engineer it? Join us as we dive into the cutting-edge science and speculative possibilities of crystalline biology.
Visit our Website: http://www.isaacarthur.net. Join Nebula: https://go.nebula.tv/isaacarthur. Support us on Patreon: / isaacarthur. Support us on Subscribestar: https://www.subscribestar.com/isaac-a… Facebook Group: / 1583992725237264 Reddit: / isaacarthur. Twitter: / isaac_a_arthur on Twitter and RT our future content. SFIA Discord Server: / discord. Credits: Crystal Aliens. Episode 436a; March 1, 2024 Written, Produced & Narrated by: Isaac Arthur. Graphics: Jeremy Jozwik, Real Courte. Music Courtesy of Epidemic Sound http://epidemicsound.com/creator
Our Universe is vast, ancient, and mysterious. It’s no surprise that in our quest to explore and explain it, many misconceptions have arisen.
The first 1,000 people to use the link will get a 1 month free trial of Skillshare https://skl.sh/isaacarthur05231 Join this channel to get access to perks: / @isaacarthursfia. Visit our Website: http://www.isaacarthur.net. Join Nebula: https://go.nebula.tv/isaacarthur. Support us on Patreon: / isaacarthur. Support us on Subscribestar: https://www.subscribestar.com/isaac-a… Group: / 1,583,992,725,237,264 Reddit: / isaacarthur Twitter: / isaac_a_arthur on Twitter and RT our future content. SFIA Discord Server: / discord Listen or Download the audio of this episode from Soundcloud: Episode’s Audio-only version: / misconceptions-about-space-time-the-universe Episode’s Narration-only version: / misconceptions-about-space-time-the-univer… ▬ Common Misconceptions ▬▬▬▬▬▬▬▬▬▬ 0:00 Intro 2:34 Space is Huge 3:58 Space has no gravity 6:29 Space is not Dark 7:57 Space is Cold 12:14 Space is Empty 14:49 Explosive Decompression 16:31 No Noise in Space 17:48 Black Holes Suck 18:51 You can’t escape a Black Hole 22:37 Nothing goes faster than light 24:23 The Edge of The Universe is 13 Billion Light Years Away 27:23 The Universe has no Edge 29:31The Universe has no Center 30:13 We aren’t the Center of the Universe 32:48 Earth Orbits the Sun 35:34 The Sun is a fiery Yellow Dwarf 38:29 Time on Spaceships runs very slow 40:17 The Universe ends with the last stars Credits: Misconceptions About Space, Time & The Universe Science & Futurism with Isaac Arthur Episode 394, May 11, 2023 Written, Produced & Narrated by Isaac Arthur Editors: Briana Brownell David McFarlane Graphics: Jeremy Jozwik Music Courtesy of Epidemic Sound http://epidemicsound.com/creator. Facebook Group: / 1583992725237264 Reddit: / isaacarthur. Twitter: / isaac_a_arthur on Twitter and RT our future content. SFIA Discord Server: / discord.
Listen or Download the audio of this episode from Soundcloud: Episode’s Audio-only version: / misconceptions-about-space-time-the-universe. Episode’s Narration-only version: / misconceptions-about-space-time-the-univer…
▬ Common Misconceptions ▬▬▬▬▬▬▬▬▬▬ 0:00 Intro. 2:34 Space is Huge. 3:58 Space has no gravity. 6:29 Space is not Dark. 7:57 Space is Cold. 12:14 Space is Empty. 14:49 Explosive Decompression. 16:31 No Noise in Space. 17:48 Black Holes Suck. 18:51 You can’t escape a Black Hole. 22:37 Nothing goes faster than light. 24:23 The Edge of The Universe is 13 Billion Light Years Away. 27:23 The Universe has no Edge. 29:31The Universe has no Center. 30:13 We aren’t the Center of the Universe. 32:48 Earth Orbits the Sun. 35:34 The Sun is a fiery Yellow Dwarf. 38:29 Time on Spaceships runs very slow. 40:17 The Universe ends with the last stars.
Credits: Misconceptions About Space, Time & The Universe. Science & Futurism with Isaac Arthur. Episode 394, May 11, 2023 Written, Produced & Narrated by Isaac Arthur.
