Articles tagged with Radiowaves
Researchers at the Ames Laboratory have developed a new method to generate broadband terahertz waves using metamaterials. This innovation has the potential to revolutionize fields such as non-invasive imaging and sensing, as well as high-speed information communication, processing, and storage.
The Van Allen Probes have provided high-resolution measurements that suggest local acceleration is at work in the Earth's radiation belts. This discovery resolves decades of uncertainty over the origin of ultra-relativistic electrons and has important implications for understanding planetary magnetospheres throughout the universe.
Millimeter-wave imaging technology helps scientists understand and manage plasma instabilities in fusion plasmas. By imaging waves and density fluctuations, researchers can develop strategies to maintain plasma stability and accelerate progress towards a viable new energy source.
Juno will explore Jupiter's northern and southern lights by flying through electrical current systems that generate them. The mission aims to understand the origin and evolution of the solar system's largest planet by mapping magnetic and gravity fields, determining atmospheric composition, and observing upper atmosphere dynamics.
Astronomers are closer to understanding the formation of planetary nebulas after discovering a star in the southern sky with a strong magnetic field. The 'blooming' star is creating a jet of charged particles that glow with radio waves, and researchers believe the magnetic field may play a key role in shaping its symmetrical jets.
A massive canyon hidden under a mile of ice has been discovered in Greenland, stretching over 460 miles and reaching depths of 2,600 feet. The feature is thought to be ancient, pre-dating the current ice sheet, and plays a crucial role in transporting sub-glacial meltwater.
Astronomers have observed a distant quasar split into multiple images by the effects of a Milky Way gas cloud. The event provides a rare opportunity to study the properties of turbulent gas in our galaxy.
Scientists have identified an internal electron accelerator operating within the Van Allen radiation belts, causing sudden and unpredictable changes. The research paves the way for predicting hazardous space weather and preparing satellite operators for intense space storms.
Researchers at MIT have discovered a new method to trap light that could find applications in lasers, solar cells, and fiber optics. The phenomenon involves destructive interference from waves of opposite phases, blocking certain wavelengths while allowing others to pass through.
Researchers used CSIRO's Australia Telescope Compact Array to study distant star-forming clumps and discovered massive amounts of molecular hydrogen gas, a key fuel for star formation. The telescope's upgraded bandwidth and sensitivity enabled the detection of carbon monoxide, allowing scientists to estimate galaxy star-formation rates.
Researchers at MIT propose a new graphene-based system that controls surface plasmons to increase device density and speed. The system may enable high-speed optical signal processing and improved ferroelectric memory devices.
A team of astronomers used the VLA to create a detailed image of the distant universe, revealing distinct galaxies with gorging black holes at their cores. The study found that 63% of background radio emission comes from galaxies with active black holes and 37% from star-forming regions.
Researchers observed a pulsar that dramatically changes its radio and X-ray emissions, defying existing theories on star emission. The study reveals the pulsar switches between two extreme states, one dominated by X-ray pulses and the other by organized radio pulses.
Researchers developed a 2-D optical phased array with 4,096 nanoantennas on a silicon chip, revolutionizing LADAR technology. The breakthrough enables high-resolution beam patterns and has potential applications in biomedical imaging, holographic displays, and ultra-high-data-rate communications.
Researchers used historical data from the Very Large Array to identify similarities between underground nuclear explosions and atmospheric disturbances. By analyzing these patterns, they found that astronomical radio telescopes could potentially spot rogue nukes, complementing GPS systems' capabilities.
Researchers at Drexel University are working on designing a hybrid network-on-chip that uses both antennas and wired interconnections to optimize communication speed. This new chip will provide a more robust platform for high-performance computing applications, such as multi-core processors and 3D chip design.
Microglia, the brain's emergency workers, use a long-lasting glutamate-driven calcium wave to detect injuries, allowing them to trace the signal backwards until they reach the site of damage. This discovery could lead to new treatments for conditions such as Alzheimer's and Parkinson's diseases.
A team of Italian and Swedish researchers has successfully transmitted two twisted radio waves across the waters of Venice, demonstrating a solution to the problem of radio frequency congestion. By twisting radio waves into fusilli pasta shapes, they were able to transmit multiple channels of information on the same frequency band.
Physicists at Rice University mimic the orbit of Jupiter's Trojan asteroids within an atom, confirming Niels Bohr's 1920 prediction on quantum mechanics and Newtonian physics. The research demonstrates control over atomic behavior using radio frequency waves.
Physicists at Aalto University have developed a method to amplify feeble radio waves or microwaves with minimal disturbance, reaching the fundamental limit set by quantum physics. The discovery uses a nanomechanical oscillator and superconducting cavity resonator to detect and amplify electromagnetic signals.
Tel Aviv University researchers have developed a new type of solar panel using nano-antennas that can convert a broader spectrum of light into electric current. This technology has the potential to improve efficiency and reduce costs, making it a viable option for green energy.
Astronomers have spotted extremely hot matter near a black hole just milliseconds before it plunges in. The unique observations suggest that some matter may be escaping via highly structured magnetic fields.
A collaboration between CSIRO and NASA has tracked down 25 ultrafast 'millisecond' pulsars in just two years, revealing insights into the physics of these small spinning stars. The research uses a combination of land- and space-based detectors to understand how pulsars make their beams of radiation.
Federici's research team developed a digital video camera using a terahertz imaging system, which can scan airport passengers quickly and efficiently. The technology uses terahertz rays to transmit through non-metallic mediums, allowing for the detection of concealed explosives or chemical agents.
Researchers at MIT have discovered a new phenomenon that causes powerful waves of energy to shoot through carbon nanotubes, enabling the production of electricity. The discovery has led to the creation of a system that produces energy about 100 times greater than an equivalent weight of lithium-ion battery.
Researchers propose EIT wave analysis as an alternative approach to measure the solar coronal magnetic field. They demonstrated that the profile of EIT wave propagation velocity can be utilized to probe the coronal magnetic field, potentially unveiling the nature of solar flares and CMEs.
Researchers create high-performance W-Band silicon-germanium RFICs for passive millimeter-wave imaging, potentially leading to less expensive security imaging systems. The new technology can resolve images down to a millimeter scale, enabling the detection of small objects on a person's body.
Astronomers have discovered a unique double-star system that represents a 'missing link' stage in the birth process of millisecond pulsars. The system, J1023, shows evidence for an accretion disk surrounding the neutron star before it disappeared and the pulsar emerged.
Scientists using NASA's THEMIS spacecraft have discovered the connection between 'singing' chorus waves and the generation of hiss, which helps clear killer electrons from Earth's radiation belts. The new research confirms that chorus waves can be refracted into the inner portion of the radiation belts by dense plasma near Earth.
A team of researchers has created a solid-state metamaterial device that can modulate tiny waves of radiation in the terahertz range, setting a standard for performance. The device, which is controlled electronically, can process terahertz frequencies 30 times faster and with greater precision than conventional optical devices.
Astronomers detected a strong magnetic field in a 6.5 billion-year-old protogalaxy, contradicting the leading theory that magnetic fields should weaken with time. The discovery was made using the National Science Foundation's ultra-sensitive Robert C. Byrd Green Bank Telescope.
Researchers at UCLA have solved a 40-year-old puzzle by identifying the source of intense radio waves in the Earth's upper atmosphere that control the dynamics of the Van Allen radiation belts. The chorus wave type is found to energize electrons and was initially thought unrelated to hiss.
A physicist has developed a novel technique to speed up scanning tunneling microscopy, enabling it to image individual atoms on a surface at least 100 times faster. The new method uses radio frequency waves to detect changes in distance between the probe and sample surface, reducing measurement times by several orders of magnitude.
Scientists at the University of Michigan developed a lens-like device that focuses electromagnetic waves down to tiny points, removing wavelength limitations for data storage and sensing applications. The breakthrough enables CD storage to hold up to one hundred times more information using terahertz radiation.
Astronomers have observed a massive nuclear explosion on the surface of a white dwarf star, sending gas into space and creating a blast wave that accelerates electrons to nearly the speed of light. The European VLBI Network tracked the outburst using telescopes around the world, revealing a cigar-like shape in the blast wave.
The study found that TEE significantly impacted the treatment or evaluation of patients with stroke entities in 22 to 32 percent of individuals, demonstrating improved care. This research has led to increased utilization of TEE in diagnosing stroke, transient ischemic attack, and peripheral embolism.
Astronomers have discovered a unique pulsar that is only 'on' for part of the time, shedding light on how pulsars emit regular beams of radio waves. The pulsar, PSR B1931+24, slows down 50% faster when it's active compared to when it's not.
The project aims to investigate high carrier frequencies of mid-infrared light for efficient communication and applications such as light-based radar devices, medical imaging, and synthesizing electronic tones. Researchers will design, build, and test thumbnail-sized chips capable of encoding data at unprecedented rates.
Duke engineers have developed a new ultrasound device that combines 3-D imaging with therapeutic heating, potentially improving doctors' most widely used method for destroying aberrant tissue in the heart. The device uses sound waves to heat tissue from a distance, eliminating the need to physically touch the tissue.
Gold bowties may allow for the production of detailed images of proteins, DNA molecules, and synthetic nano-objects. The device amplifies near-infrared light into a concentrated speck of light, improving resolution by a factor of 10 compared to conventional microscopes.
Physicist Rose suggests that inscribing information on a physical medium can be more energy-efficient than sending messages through radio waves. He proposes this method as a solution for communicating with extraterrestrial civilizations, potentially leading to millions of messages being discovered on Earth or other celestial bodies.
Researchers at Virginia Tech are developing e-textiles with embedded sensors and electronic components to create wearable computers and sensing systems. These fabrics can detect sounds, chemicals, and pick up satellite signals, enabling various industrial and military applications.
Researchers at the University of Durham are using the H.E.S.S. telescope array to investigate extreme cosmic environments and detect gamma-ray sources, including supernova remnants and active galactic nuclei. The project seeks to shed light on the origin of cosmic rays, which bombard Earth from space.
Researchers found that low-energy radio waves can kill zebra mussels by depleting calcium levels in the water, which are essential for their survival. This method is considered an eco-friendly alternative to traditional chemical treatments or molluscicides, and may be effective in preventing pipe clogging.
Recent study examines over 100 gamma-ray bursts, finds no evidence supporting synchrotron shock model. Researchers analyze low-energy spectra to determine burst causes.
Researchers at PPPL and USDA's ERRC are collaborating on a $120,000 project to develop radio frequency pasteurization methods. The new techniques use RF waves and microwave heating to effectively pasteurize raw liquid foods like eggs and milk without overheating them.