Articles tagged with Heat Radiation
Scientists have developed a new method to manipulate heat transfer using carefully engineered metamaterials, boosting it by up to four times. This breakthrough could lead to more efficient cooling strategies for electronic devices, improved thermophotovoltaic systems, and enhanced sensing technologies.
Researchers found that heat transfer values increase dramatically at distances less than ten nanometres, exceeding theoretical predictions by a factor of one hundred. This phenomenon challenges current understanding of heat transfer in the nanometre range.
Researchers at Pohang University of Science & Technology experimentally demonstrated the existence of nanometer-sized liquid clusters in supercritical fluids, overturning the prevailing notion of a single phase. These clusters persisted for up to an hour and have significant implications for industrial processes and natural environments.
Southwest Research Institute (SwRI) is expanding its heat exchanger testing capabilities to include megawatt-scale performance evaluations. This move addresses a significant market gap for high-heat transfer rates involving high-temperature and -flowrate applications in data centers, defense, and other fields.
Researchers have discovered that urban areas experience a greater difference in wet bulb globe temperature between 0.5 m and 1.5 m above ground due to surface heat radiation, posing health risks to children and pets during extreme heat events. Total solar eclipses also alter atmospheric conditions and insect behavior, with some species...
MIT engineers developed ultrathin electronic films that sense heat and other signals, reducing the bulk of conventional goggles and scopes. The new pyroelectric thin film is highly sensitive to heat and radiation across the far-infrared spectrum, enabling lighter, more portable night-vision eyewear.
Researchers from Tokyo Metropolitan University developed a new dye that strongly absorbs second near-IR radiation, transforming it to heat. This breakthrough enables clearer imaging and better delivery of heat for therapies in deep tissue medicine.
A new smart window technology combines liquid crystals with nanoporous microparticles and a patterned vanadium dioxide layer to simultaneously control visible light and infrared radiation. The device offers fast, efficient heat and visibility management, marking a significant step forward in energy-efficient building design.
A new study using the James Webb Space Telescope has reevaluated the atmospheric composition of Trappist-1 b, finding conditions that could support a thick CO2-rich atmosphere. Researchers propose that haze from hydrocarbon compounds in the upper atmosphere may explain this scenario.
Three Ph.D. students and a postdoctoral researcher from Texas A&M are working on RTE projects to create new materials for future nuclear reactors. They are using the Texas A&M Accelerator Laboratory and Idaho National Laboratory to irradiate material, creating voids that can help understand swelling in nuclear reactors.
A new method to measure continuous light spectrum improves thermal imaging accuracy without direct contact. It eliminates wavelength and temperature dependence, revealing higher surface temperatures of photothermal catalysts than previous methods.
A team of researchers from TU Wien and the University of Manchester demonstrated the control of thermal radiation by manipulating its topological properties. They created a coating with varying metal layer thickness along the coastline of the British Isles, allowing for localized heat emission at specific points.
Researchers have identified collagen features as valuable biomarkers for evaluating melanoma immunotherapy response. Single-fiber characteristics were found to be more sensitive to treatment-induced changes than bulk collagen features, offering insights into collagen remodeling over time.
Researchers from the University of Tokyo have developed a novel approach to manage waste heat in microcircuits by adding a tiny coating of silicon dioxide. This increases the rate of heat dissipation, allowing for faster cooling and potentially leading to smaller and cheaper electronic devices.
Researchers analyzed 42 superflares using two models and concluded that hydrogen recombination is the most physically plausible explanation for high levels of energy. This model is supported by flare processes described in solar flares, which are well-studied phenomena.
Researchers used thermodynamics to describe the expansion of the Universe, finding that adiabatic and anisotropic effects are accompanied by cooling due to the barocaloric effect. The study proposes a novel way to investigate anisotropic effects associated with the expansion of the Universe.
Researchers unveil previously unknown type of shockwave within TDEs, confirming that shock dissipation powers the brightest phases. The study paves the way for precise measurements of crucial black hole properties and testing Einstein's predictions in extreme environments.
Research using thermal imaging found that numbats are prone to overheating during hot weather, with body temperatures exceeding 40°C. Their unique fur mechanism allows for heat exchange, but is limited by temperature and shade availability.
Researchers propose an indirect optical method for determining internal temperatures of opaque packed beds based on phosphor thermometry. Ray tracing simulations enable simultaneous multi-point measurements, allowing for accurate full temperature distribution within the bed.
Researchers at City University of Hong Kong have developed a passive radiative cooling material that achieves high-performance optical properties. The cooling ceramic reduces thermal load, provides stable cooling performance, and can be used in various building applications.
A study published in Nature Geoscience found that blowing snow produces fine sea salt aerosols, increasing particle concentration and cloud formation in the central Arctic. These aerosols contribute to Arctic warming by trapping surface long-wave radiation, boosting temperatures.
Researchers at Purdue University have developed an innovative thermal imaging method called HADAR, which enables artificial intelligence to perceive physical attributes and recover textures in pitch-dark environments. The technology has the potential to revolutionize fields such as autonomous vehicles and robotics.
Researchers at Kyoto University have developed a new fusion model that accurately predicts the rotational temperature of hydrogen molecules near the walls of tokamaks. This innovation enables the effective management of heat load and extends the lifetime of future fusion devices.
A research team at CityU developed a multifunctional composite polymer coating with both radiative and non-radiative cooling capacity, enhancing heat dissipation in wearable electronics. The cooling interface achieved temperature drops of over 56°C, improving the performance of skin electronic devices.
Researchers at Drexel University discovered that a thin MXene coating can enhance a material's ability to trap or shed heat. The coating, which is 200-300 times thinner than a human hair, can be used for both localized thermal management and large-scale radiative heating and cooling systems.
A new AI system predicts heat transfer coefficients with higher accuracy than existing methods, providing reliable results and uncertainty analysis. The system combines deep learning and Gaussian process regression to tackle the challenges of mini-channel heat transfer.
Researchers have developed a single-cell PV design integrated with nonreciprocal optical components to provide 100-percent reuse of emitted radiation, breaking the Shockley–Queisser limit. This breakthrough enables a quasimonochromatic radiation converter to reach the theoretically maximum Carnot efficiency.
Australian researchers have developed a device that can generate electricity from thermal radiation using technology similar to night-vision goggles. The team successfully tested a 'thermo-radiative diode' capable of converting infrared heat into electrical power, with the potential to harness solar energy at night.
Scientists have identified the cuticle as the primary defense mechanism for plants against UV-B radiation, with protection levels exceeding 90%. The cuticle absorbs energy and converts it into heat, maintaining continued protection through a cyclical process.
Pusan National University researchers demonstrate the effectiveness of integrating a radiative cooler with a multi-junction solar cell, achieving a 6°C temperature drop and a 2% increase in open-circuit voltage. This breakthrough could lead to more efficient and eco-friendly solar cells, paving the way for renewable energy sources.
Scientists developed an all-season smart-roof coating that automatically switches between cooling and heating, outperforming commercial cool-roof systems in energy savings. The technology uses vanadium dioxide to regulate its rate of radiative cooling, overcoming the problem of overcooling in winter.
Scientists from UCLA develop a do-it-yourself radiative cooler using household materials, achieving moderate to large temperature drops. The design's reproducibility and low cost make it an attractive standard for research settings.
Scientists at NTU Singapore develop a new electrochromic window material that can block up to 70% of infrared radiation while allowing 90% of visible light to pass through. The material is designed to be energy-efficient and durable, with improved performance compared to existing technologies.
Researchers developed a modular organic molecular system with customizable properties, creating a potent dye that absorbs light in the near-infrared range. The pigments' electronic switchability makes them suitable for studying electron transfer in photosynthesis and as efficient electron-transporting materials.
Researchers at ETH Zurich developed a technology to harvest water 24/7 with no energy input, using specially coated glass and a radiation shield. The device can produce up to twice as much water as current passive technologies, with potential for large-scale integration.
Researchers at the University of Utah have developed a theoretical method to thermally cloak objects, making them invisible to thermal cameras. Using heat pumps, they can fine-tune heat transfer and mimic heat signatures of different objects.
Researchers have developed a class of materials that manipulates thermal radiation, allowing for efficient energy conversion systems and improved sensing technologies. By directing heat in specific directions over broad spectra, the new material offers capabilities for imaging, sensing applications, solar heating, waste heat recovery, ...
A new study found that urban areas in the US Southwest are experiencing extreme heat disparities, with lower socio-economic groups facing significantly higher temperatures. The study revealed that California's urban regions had the largest temperature differences between wealthier and poorer neighborhoods.
Researchers developed the Cold Tube, a system of rectangular panels that absorb heat radiation from a person's body, creating a cooling sensation. This technology can be used in outdoor spaces like summer fairs and public markets, reducing energy consumption by up to 50%.
A team from the University of Córdoba validates a solar-powered air heating system, which can cover 75% of heating demands on 75% of days. The system uses Unglazed Transpired Collectors to absorb heat generated by sunlight and preheat ventilation air.
Researchers measured pedestrian heat exposure over regular asphalt roads, reflective coated roads and sidewalks next to the roads. The study found that the surface temperature of coated asphalt road was up to 6 degrees Celsius cooler than the regular road in the afternoon, but the radiant heat over coated asphalt was higher.
Researchers found that aerosol-photolysis interaction impacts atmospheric oxidants, leading to decreased secondary aerosol formation. ARI increased near-surface PM2.5, while API suppressed its formation, resulting in a net 4.8% increase.
The new coarse-grained model explains how seasonal changes in rainfall, solar radiation, and vegetation conditions affect surface urban heat islands at a city-wide scale. It provides general insights for city planners and scientists to design heat mitigation strategies.
Researchers create non-contact and non-invasive technique to measure temperature transients in time and thermal images in space at terahertz frequencies. The smallest gold particles converted laser light to heat with the highest efficiency, approximately 90%, making this method promising for biomedical applications.
Researchers at Purdue University have developed ceramic nanotubes that behave as thermal antennas, controlling the spectrum and direction of high-temperature heat radiation in gas turbines. This allows for increased engine lifetime and performance.
Researchers found that impurities swept away in deeper water decrease in size with surface elasticity, while counterflows cancel out fluid movement. In shallow water, the boundary becomes blurred, revealing new processes in well-studied physics experiments.
Researchers have discovered a way to produce more electricity from heat than thought possible by creating a silicon chip that converts thermal radiation into electricity. The chip can generate electricity even closer two silicon surfaces are together, potentially increasing battery life by up to 50%.
Scientists at the University of Jyväskylä create optimized holey nanostructures that significantly reduce heat conduction by over a hundredfold. The study's findings have potential applications in thermoelectric power conversion, cooling, and bolometric radiation detection.
Researchers at The University of Tokyo created a thermomechanical device to detect terahertz radiation, allowing for sensitive and rapid detection at room temperature. This technology opens up new applications for THz technologies, such as THz cameras.
Researchers at Linköping University developed a sensor that combines pyroelectric and thermoelectric effects with nano-optical phenomena, enabling rapid and stable detection of temperature variations from warm objects or sunlight. The sensor is also pressure-sensitive and can distinguish between different materials.
Researchers at NIST have developed a portable, stable standards-quality radiation thermometer capable of measuring temperatures to a precision of within a few thousandths of a degree Celsius. The instrument is suitable for applications such as clinical medicine, satellite measurement, and food processing.
Researchers at MIT have developed a material that can be tailored to reflect or absorb infrared radiation independently of its visible light properties. The new polymer material can be designed for various applications, including colorful, heat-reflecting building facades and light-absorbing covers for solar panels.
Research reveals that sea ice loss in the Arctic causes rapid warming, which will persist even after melting is complete. The study suggests that this phenomenon is more pronounced during certain periods, particularly during cloud season, due to seasonal sea-ice melting and its impact on atmospheric heat transfer.
Researchers created a fabric with conductive metal coating that can gate infrared radiation, allowing for instant cooling or insulation. The fabric's dynamic properties are ideal for regulating body temperature in various environments.
Researchers developed an adaptive textile that self-regulates its thermal properties based on the wearer's body temperature and humidity. The textile, made from infrared-sensitive yarn, can passively cool the body through radiative cooling and alter heat radiation by up to 35%.
Researchers from MIT's EAPS department found a linear relationship between the Earth's surface temperature and its outgoing heat, which may break down at higher temperatures. The study suggests that water vapor feedback is responsible for this relationship, and it could help climate scientists model the effects of climate change.
New results show up to 100 times more heat can flow between nanoscale objects than predicted, with implications for solar cells and materials. The discovery could enable new ways to control heat in devices, such as heat transistors and diodes.
Researchers from Toyohashi University of Technology discovered that smoldering combustion can sustain even under nearly 1% atmospheric pressure, challenging conventional fire extinguishing methods. The study's findings suggest that vacuumed operations to extinguish fires in space may fail unless proper conditions are achieved.
Researchers have developed a new ultrafast and highly sensitive bolometer that can work at room temperature, paving the way for new astronomical observatories, heat sensors, and quantum sensing devices. The device uses graphene to amplify absorption of electromagnetic radiation, enabling precise measurements in picoseconds.
Urban heat islands are caused by cities trapping more heat than surrounding areas due to their structure, affecting energy consumption and air quality. Researchers studied 50 cities and found that well-organized cities with straight streets retain more heat at night, leading to increased energy bills in hot climates.