Researchers optimize micronozzle design through numerical simulation and design optimization to improve thrust force and specific impulse. The study finds that wall heat transfer, convergence duct design, throat shape, and expander structural parameters significantly affect nozzle performance.
Researchers at West Virginia University have developed a new theory that extends the first law of thermodynamics to systems not in equilibrium. This breakthrough has numerous potential applications across physics and other sciences, including studying plasmas in space and low-temperature plasmas.
A Chinese research team has developed a barocaloric thermal battery concept that extracts thermal energy from low-temperature waste heat sources by controlling pressure. The system, materialized in ammonium thiocyanate, releases up to 11 times more heat than the mechanical energy input.
New research shows climate change played a key role in dinosaurs' rise to success during the Late Triassic and Early Jurassic periods. The planet's warming after the Triassic-Jurassic mass extinction event allowed sauropod-like dinosaurs to thrive and expand across new territories, becoming the dominant species.
Scientists have developed a method to accurately measure the thermal expansion coefficient of 2D materials when heated, which could help engineers design next-generation electronics. The approach uses laser light to track vibrations of atoms in the material, allowing for precise measurements and confirming theoretical calculations.
Researchers developed a technique to 'see' fine structure and chemical composition of human cells with high resolution. The new method uses infrared light to reveal chemical signatures without fluorescent labeling.
Researchers at Penn State have developed Zentropy theory, a new approach to understanding entropy that can predict anomalies in physical properties like volume. The theory may lead to breakthroughs in designing superconducting materials and structural materials that withstand higher temperatures.
Researchers at City University of Hong Kong have discovered a super-elastic high-entropy Elinvar alloy that retains its stiffness even after being heated to 1000 K. The alloy's unique structure and chemical composition allow it to store a large amount of elastic energy, making it suitable for high-precision devices in aerospace enginee...
A recent study reveals the physical properties responsible for Ca2RuO4's negative thermal expansion (NTE), a phenomenon where materials shrink when heated. The research proposes a new route to designing unconventional NTE materials, which could lead to the creation of composites showing no overall thermal expansion.
Dr Martin White's research proposes a two-phase expansion system that can generate up to 28% more power than conventional single-phase systems. The study aims to enhance the performance of Organic Rankine Cycle (ORC) systems for waste heat recovery, reducing environmental footprint in industries such as iron and steel, food, and drink.
Researchers replaced regenerator materials with activated carbon, increasing cooling capacity and reducing temperature fluctuations. The use of superactivated carbon particles enabled the creation of a low-cost alternative to precious metals.
Researchers have discovered a phenomenon related to the invar effect, enabling paramagnetic alloys to maintain mechanical stability at high temperatures. This breakthrough discovery promises to advance the design of high-temperature alloys with exceptional properties.
Scientists have created a new composite material combining thermal expansion properties of invar alloys with additional physical characteristics. The material, made from aluminum and samarium hexaboride, has near-zero heat expansion and demonstrates invar behavior up to 60 K.
Scientists at Tokyo Institute of Technology synthesized a novel material with negative thermal expansion properties, which may help avoid damage to composite materials. The material exhibits both phase transition and framework-type mechanisms, providing a potential solution for the overheating problem in composite materials.
Sea level variability is expected to increase with warming, altering tidal cycles and enhancing coastal flooding and erosion risks. Researchers found that nearly all global models agree on an overall tendency for increased variability on seasonal-to-interannual timescales.
A new theory proposes that early Earth's lithosphere heated up and expanded, causing cracks that eventually divided the planet into plates. The model, developed by Dr. Alexander Webb and his team, suggests that volcanic heat loss led to thermal contraction, which in turn caused the outer shell to warm up and expand.
A team of scientists has found that iron-platinum thin films exhibit minimal expansion when heated, making them suitable for HAMR memories. The discovery was made using ultrashort X-ray pulses to measure the crystal lattice's response to laser excitation.
A study using satellite data and in-situ sensor observations found that the end date of plant photosynthesis is constrained by both temperature and water limits. As temperatures decrease, soil water demands increase to support continued vegetation growth, potentially leading to expansions of regions with limited photosynthesis.
A study on collared lemming genomic variation reveals high genetic diversity in West Beringia, suggesting this region acts as a refuge for cold-adapted species. Temperature changes during the last interglacial period may have driven northward expansion of forests, leading to habitat contraction.
Researchers at Waseda University have finally cracked the code on magnetism-driven negative thermal expansion (NTE), a phenomenon that can make materials less heat-sensitive. The study reveals that antiferromagnets with competing direct and indirect exchange paths are potential candidates for exhibiting NTE.
Researchers developed a theory of relaxation in hexagonal ice, which can indicate water purity and quality through dielectric polarization changes. The study used spectroscopy to analyze ice under different temperatures, revealing non-Arrhenius behavior.
Researchers at Queen Mary University of London and University of Cambridge developed auxetic materials with smooth curves, enabling repeated deformations without damage. These materials can be used in energy-efficient gripping tools, re-configurable shape-on-demand materials, and lattices with unique thermal expansion behaviour.
A recent study by the Joint Research Centre reveals that changes in global vegetation cover from 2000 to 2015 have made the planet warmer. The research found that the removal of tropical evergreen forests for agricultural expansion is the most significant factor contributing to local increases in surface temperature.
Nagoya University researchers have developed a new class of composite materials with negative thermal expansion, offering potential solutions for industrial applications. The reduced ruthenate ceramic material shrinks by up to 6.7% when heated, making it more than double the current record-holding material.
Researchers at MIT have created tiny, star-shaped structures that shrink in size when heated to 540 degrees Fahrenheit. The structures, made from interconnected beams with different thermal expansion coefficients, exhibit negative thermal expansion and may enable applications in heat-resistant circuit boards.
Researchers measured thermal expansion of ceramics and silicon in a precise temperature range, revealing significant deviations from reference values. The results are crucial for future space missions like JWST and SPICA.
A team of physicists has identified a material with negative thermal expansion, shrinking in size as it warms. The discovery challenges current theoretical understanding of thermal expansion and may lead to the development of more durable electronics.
A new DIY experiment by QUT physicists demonstrates how oceans expand as they heat up, causing sea levels to rise. The study finds that thermal expansion is responsible for most of the rising sea levels during the past century, with melting ice sheets contributing to further increases.
Researchers proposed a new constitutive model to accurately describe the thermo-elasto-plasticity deformation of metal crystals at various temperatures. The model uses a simple and efficient approach, considering thermal expansion and its effects on plastic behavior.
Researchers developed a new self-assembled material that can amplify small variations in temperature and concentration of biomolecules, making it suitable for biosensors and drug delivery systems. The material's unique response to changes in temperature and concentration could lead to significant advancements in sensing technology.
Scientists successfully predicted the thermal expansion of metastable liquid metals by analyzing atomic structures with just one thousand atoms. This breakthrough reveals a connection between microscopic information and macroscopic material properties.
Researchers successfully fabricated high-quality CrO2 films on TiO2 substrates using a simple route, exhibiting half-metallic ferromagnetism and unique transport properties. The films show narrow crystallinity, low coercive field, and temperature-dependent magnetization following Bloch's T3/2 law.
For the first time, researchers have observed how reducing dimensions affects ferroelectrics' susceptibility to size- and strain-induced effects. This work provides a detailed modeling and experimental study of pyroelectricity, with direct implications for next-generation devices.
Researchers discovered negative thermal expansion in ScF3 through computer simulations and neutron scattering experiments. The material shrinks as it heats up due to unique atomic vibrations.
Researchers found significant spatial variations in land movement along the US Atlantic coast, with mid-Atlantic regions subsiding twice as much as northern and southern areas. Coastal subsidence enhances sea-level rise, leading to shoreline erosion and loss of wetlands.
A new study published in Nature finds that ocean temperatures and sea level increases between 1961 and 2003 were 50% larger than previously thought. The results show sea levels rose by 1.5 millimeters per year, equating to a 2-inch increase in ocean levels over 42 years.
Recent research found California's temperatures have jumped statewide by more than 2.1 degrees Fahrenheit between 1915 and 2000, with the warming being fastest in late winter and early spring. The study suggests that natural causes alone cannot explain this trend and points to greenhouse gases and urbanization as contributing factors.
Scientists have discovered a hybrid semiconductor material with zero thermal expansion, which could revolutionize the design of future electronics and optoelectronics. The material, composed of alternating organic and inorganic layers, contracts while expanding, resulting in zero net thermal expansion.
Scientists observed a chemical reaction in liquid methanol after hitting a molecule with a short laser pulse. The research confirms a long-standing hypothesis regarding the evolution of the molecule, providing new insights into chemical reactions in liquids.
A new study quantifies the committed climate change in the 21st century, predicting a half-degree Celsius global temperature rise and over 11 centimeters of sea level rise by 2100. The warming is driven by thermal inertia from oceans and existing greenhouse gases.
Researchers at UCSC have made new insights into the atomic interactions underlying zirconium tungstate's negative thermal expansion. The team found a combination of geometrical frustration and unusual atomic motions are likely important to this phenomenon.
Research reveals that concrete floor slabs can develop vertical cracks within 14-16 minutes of fire exposure, leading to rapid weight loss. The new temperature-dependent model also finds that thick floors are more sensitive to thermal expansion than thin ones.
A study by Stanford researchers reveals that global warming is causing a significant shift in marine species distribution, with many vulnerable intertidal creatures already struggling to cope. Rising temperatures are pushing species over their thermal tolerance range, leading to declines and potential extinctions.
Scientists have discovered that single-isotope silicon can conduct heat more efficiently than natural silicon, with a 60% improvement in thermal conductivity at room temperature. This enhancement is attributed to the suppression of phonon scattering caused by fluctuations in atomic masses, resulting in improved heat transfer rates.
A new study of borehole temperatures reveals that the 20th century was the warmest of the past five centuries, with Earth's temperature increasing about 1 degree Celsius since 1500. The analysis, which combined data from over 600 sites worldwide, found a greater warming trend in the Northern Hemisphere than previously estimated.
Astronomers have discovered an expanding oxygen and neon ring in the remnants of a massive star explosion, providing unprecedented insights into the creation and dispersal of heavy elements. The findings suggest that these elements are necessary for life on Earth and could provide clues to the nature of supernovae.
A team of scientists used Chandra to observe the Andromeda Galaxy and found a supermassive black hole with a surprisingly cool gas funneling into it. The temperature of this gas is only several million degrees, unlike other X-ray sources in the galaxy that reach millions of degrees.
Temple University physicist Zameer Hasan is working to increase the storage capacity of compact discs by using lasers to distinguish between different colors, allowing for a billion-fold increase in data storage. His research focuses on creating materials that can withstand high temperatures and improve the speed of laser reading.
Scientists have developed sheets of single-walled nanotubes that generate higher stresses than natural muscle and higher strains than high-modulus ferroelectrics. The carbon nanotube actuators work in aqueous environments, including salt water, and require small voltages to produce large length changes.
A NASA study led by Dr. Dale Quattrochi found that Atlanta's urban expansion creates a unique heat island effect, influencing local weather patterns and air quality. The study revealed that this phenomenon can lead to increased ozone production and thunderstorms due to the interaction between warm air and surrounding areas.
A new theory called inflationary cosmology suggests that the universe may have begun as a fractal, with an exponential expansion period. This theory provides answers to several questions about the origin of the universe and its structure.
Researchers at Johns Hopkins University and Bell Labs have found clues that subvert the natural law of thermal expansion, suggesting the possibility of creating composite materials that actually shrink under heat. This discovery could lead to significant advancements in various fields, including computing and telecommunications.
Dinosaur tooth enamel holds secrets to ancient climate conditions, with new analysis suggesting middle latitudes may not have been warmer than today. Data from Madagascar indicates sub-tropical latitudes were warmer and more arid during the Late Cretaceous era.
Biological clocks in animals and plants regulated by temperature rather than light, according to Dartmouth study. Temperature cycles may be crucial for maintaining circadian rhythm in humans, particularly during seasonal changes.
Researchers developed a new type of polymeric membrane that can operate at elevated temperatures and withstand harsh chemical environments. The membrane could potentially recover large volumes of hydrogen gas, reducing the environmental impact of refining processes and making it economically feasible.
University at Buffalo chemists have developed a new method to generate coatings for electronic devices, eliminating toxic precursors and enabling the creation of unique materials with photonics applications. The technique uses high temperatures and quenching to produce uniform films without fail.
Researchers have developed a prototype drug pump that can monitor its own flow rate, ensuring steady stream of medicine and enabling diabetics to manage their condition more effectively. The device is made on a single silicon wafer and uses a titanium-nickel alloy to flex and regulate fluid flow.
Researchers at Oregon State University have discovered a new compound with unique properties that could be used in various applications. The compound, zirconium tungstate, has been found to behave under high pressures and has potential uses in electronics, optics and dental care.
Researchers at the University of Illinois have invented a faucet that drips automatically to relieve pressure and prevent pipe bursts. The design is centered on southern states where subfreezing temperatures are rare, and construction lacks attention to protecting pipes from outside temperatures.