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Category: computing – Page 3

Disorder Drives One of Nature’s Most Complex Machines

* A “Bouncer” Made of Motion: New high-resolution microscopy and computational modeling (notably a study from late 2025) reveal that the NPC’s function is driven by this very flexibility. The disordered tails constantly rearrange themselves, creating a dynamic barrier that recognizes and ushers through specific molecules while blocking harmful enzymes or misfolded RNA.

* Scientific Breakthrough: By moving beyond static “snapshots” of the pore to observing it in motion at millisecond resolution, researchers have realized that disorder, not order, is the secret to the nuclear pore’s speed and precision.

In essence, the article highlights a paradigm shift in biology: the realization that one of life’s most complex and essential machines functions not like a rigid mechanical valve, but like a flexible, chaotic filter that uses “wiggle room” to maintain the integrity of the genetic code.

Every second, hundreds to thousands of molecules move through thousands of nuclear pores in each of your cells. A new high-definition view reveals the machine in action.

California’s OS-based age verification law challenges open-source community

How Linux and BSD Distros Are Responding to the New Age Verification Laws https://itsfoss.com/news/distros-response-age-verification-laws/

California’s new online safety bill, AB 1,043 (the Digital Age Assurance Act), adopts a declared age model for operating systems. Under the law, which is set to take effect on January 1, 2027, when a user sets up a new device, the operating system is required to ask for their age or date of birth. This declared age will be used to curate what’s available on the app store, and can be shared with developers on request to ensure age-appropriate experiences.

An article in PC Gamer points out that this “sounds incompatible with many of today’s open source software, including Linux.” The open source community is wrestling with the problem of how to comply with the laws while also not violating core privacy principles.

The piece muses on technical solutions, quoting Jef Spaleta, project leader for popular Linux distribution, The Fedora Project, who says “this might be as simple as extending how we currently map uid to usernames and group membership and having a new file in /etc/ that keeps up with age.”

Local droplet etching yields more symmetric quantum dots for integrated photonics

Light-based quantum technologies, such as quantum communication and photonic quantum computing, require reliable sources of individual photons and, ideally, pairs of entangled photons. Semiconductor quantum dots are promising candidates for this purpose. These nanostructures have electrical conductivity between that of insulators and conductors and are capable of confining electrons and holes. This property causes them to emit light at well-defined frequencies when excited by a laser.

Atom-thin material could help solve chip manufacturing problem

Making computer chips smaller is not just about better design. It also depends on a critical step in manufacturing called patterning, where nanoscale structures are carved into materials to form the circuits inside everything from smartphones to advanced sensors.

To create these patterns, engineers use a hard mask, a thin, durable material layer that protects selected regions while the exposed areas are etched away.

“As chips get smaller, the manufacturing process becomes much more demanding,” said Saptarshi Das, Penn State Ackley Professor of Engineering Science and professor of engineering science and mechanics. “The mask used to define these patterns must survive extremely harsh processing conditions. If the mask degrades, the patterns cannot be transferred reliably.”

Low-cost, high-performance plastic heat exchanger rivals traditional metal systems

A recent study in Advanced Science reports an innovative, low-cost polymer heat exchanger that could transform how industries manage heat. The device was developed by a Rice University research team led by Daniel J. Preston, assistant professor of mechanical engineering.

Heat exchangers are essential to modern technology. They improve and reduce waste by transferring heat between fluids, enabling safe and effective operation of everyday appliances like computers, cars and refrigerators as well as large-scale systems such as industrial plants and rockets.

Made of metal, current heat exchangers are heavy and bulky, prone to rusting and clogging and costly to buy and maintain. As heat-generating infrastructure grows—from data centers and desalination plants to compact electronics and space technologies—engineers are seeking lighter, more compact and affordable alternatives.

Twisted bilayer photonic crystals dynamically tune light’s handedness

Researchers at the Harvard John A. Paulson School of Engineering and Applied Sciences (SEAS) have created a chip-scale device that can dynamically control the “handedness” of light as it passes through—also known as its optical chirality—with a simple twist of two specially designed photonic crystals. The study is published in the journal Optica.

The work, led by graduate student Fan Du in the lab of Eric Mazur, the Balkanski Professor of Physics and Applied Physics, describes a reconfigurable twisted bilayer photonic crystal that can be tuned in real time using an integrated micro-electromechanical system (MEMS). The breakthrough opens new possibilities for advanced chiral sensing, optical communication, and quantum photonics.

“Chirality is very important in many fields of science—from pharma to chemistry, biology, and of course, physics and photonics,” Mazur said. “By integrating twisted photonic crystals with MEMS, we have a platform that is not only powerful from a physics standpoint, but also compatible with the way modern photonics are manufactured.”

Photonic ‘ski jumps’ efficiently beam light into free space

Photonic chips use light to process data instead of electricity, enabling faster communication speeds and greater bandwidth. Most of that light typically stays on the chip, trapped in optical wires, and is difficult to transmit to the outside world in an efficient manner.

If a lot of light could be rapidly and precisely beamed off the chip, free from the confines of the wiring, it could open the door to higher-resolution displays, smaller Lidar systems, more precise 3D printers, or larger-scale quantum computers.

Now, researchers from MIT and elsewhere have developed a new class of photonic devices that enable the precise broadcasting of light from the chip into free space in a scalable way.

Acoustic driving enables controlled condensation of light and matter on chip

An international research team led by Alexander Kuznetsov at the Paul Drude Institute for Solid State Electronics (PDI) in Berlin has demonstrated a fundamentally new way to control the condensation of hybrid light-matter particles. Using coherent acoustic driving to dynamically reshape the energy landscape of a semiconductor microcavity, the researchers achieved deterministic steering of a macroscopic quantum state into its lowest energy configuration.

The results, published in Nature Photonics, establish a strategy for engineering nonequilibrium quantum states and open prospects for ultrafast, tunable photonic technologies.

In collaboration with long-term partners from the National Scientific and Technical Research Council CONICET and the Bariloche Atomic Center and Balseiro Institute in Argentina, the team experimentally realized a universal scheme for selectively transferring populations within a multilevel quantum system using strong time periodic modulation.

Simulations suggest a breakthrough in understanding how turbulence develops

A new study revisits a century-old question about how turbulence starts. The findings could potentially influence not only aircraft engineering but even the design of mechanical heart valves, and treatment of heart disease. The study is published in Scientific Reports.

Computer simulations at Stockholm’s KTH Royal Institute of Technology indicate that very small vortices may create increasingly larger swirls of flow—the opposite of the traditional view of how energy is transferred in turbulence.

Often seen in nature, from whirlpools to the shape of galaxies, vortices are one of the main flow structures that drive turbulence. The dominant idea over the last 100 years is that large swirling motions in a fluid break apart into smaller and smaller swirls, passing energy down the chain until it finally disappears—a process known as the forward cascade.

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