| 单词 | boundary layer |
| 例句 | They noted that their study was the first to officially discover airborne microplastics in cloud water both in the atmospheric boundary layer and in the free troposphere. Japanese study detects microplastics in clouds, potentially altering the climate 2023-09-29T04:00:00Z Additionally, researchers are increasingly flying drones into the little-studied lower and most dangerous part of a hurricane, called the boundary layer, in order to gather useful information about how storms intensify. Hurricanes are escalating more quickly than ever. Here’s why. 2023-09-15T04:00:00Z At night and during cooler times of the year, the planetary boundary layer contracts as the sun’s heat does less to warm Earth’s surface. It's not windy, but wildfires are still spreading in California 2023-08-01T04:00:00Z The early stages of life also probably included more complex aggregations of molecules into enclosed structures with an internal environment, a boundary layer of some form, and the external environment. Concepts of Biology 2013-04-25T00:00:00Z When those waves meet this boundary layer — formally known as ultra low velocity zones — they bounce around and get deflected in ways that allow geoscientists to model the structure. Earth’s core seems to be surrounded by enigmatic layer, geologists say 2023-04-10T04:00:00Z As a ball moves through air, a thin layer of mostly still air called the boundary layer surrounds some part of the ball. Men’s World Cup Soccer Ball, the Al Rihla, Has the Aerodynamics of a Champion 2022-11-19T05:00:00Z "You have this really important, critical piece in this planetary boundary layer, like in the first few kilometres above the ground," said Alexandre Kling, a research scientist in Nasa's Mars Climate Modeling Center. Albatross-inspired glider designed for Mars flight 2022-07-14T04:00:00Z As the summertime sun’s heat increases, the planetary boundary layer expands. It's not windy, but wildfires are still spreading in California 2023-08-01T04:00:00Z “Earth’s atmosphere is a prime example of a highly turbulent boundary layer,” she says. Turbulence Equations Discovered After Century-Long Quest 2022-02-08T05:00:00Z New measurements from 15 seismic stations buried in the snow across Antarctica have revealed that this weird boundary layer, nearly 2,000 miles deep, may have once been part of the surface. Earth’s core seems to be surrounded by enigmatic layer, geologists say 2023-04-10T04:00:00Z At low speeds this boundary layer will only cover the front half of the ball before the flowing air peels away from the surface. Men’s World Cup Soccer Ball, the Al Rihla, Has the Aerodynamics of a Champion 2022-11-19T05:00:00Z The additional layers added to the model will allow for improvement in two key areas – the near-surface “boundary layer,” and the stratosphere, the second layer of earth’s atmosphere. NOAA launches major upgrade to flagship ‘American’ weather prediction model 2021-03-22T04:00:00Z Scientists explain the increasing evening heat by pointing to the section of the atmosphere called the boundary layer, which sits just above the ground. One Climate-Change Wildfire Risk Lurks in the Dark 2020-10-27T04:00:00Z Their vesper flights take them to the top of what is called the convective boundary layer. The Mysterious Life of Birds Who Never Come Down 2020-07-29T04:00:00Z Referred to by scientists as a “boundary layer,” the airflow characteristics of a hypersonic weapon’s flight trajectory greatly impact the stability of the system. Pentagon seeks new space tech to destroy hypersonic attacks 2020-07-20T04:00:00Z When a ball is moving quickly, though, the boundary layer wraps much farther around the ball. Men’s World Cup Soccer Ball, the Al Rihla, Has the Aerodynamics of a Champion 2022-11-19T05:00:00Z Developers seek to engineer configurations that will generate a “laminar” or smooth airflow as opposed to “turbulent” boundary layer to enable a weapon to sustain an accurate trajectory and manage excessive heat. Is China's new J-31 stealth multi-role fighter an F-35 rip-off? 2020-07-15T04:00:00Z But there is another explanation that applies globally, involving the boundary layer, the lowest part of the atmosphere that is directly affected by the surface. Scientists predict scorching temperatures to last through summer 2020-06-18T04:00:00Z They aren’t always cresting the atmospheric boundary layer at dizzying heights; most of the time they are living below it in thick and complicated air. The Mysterious Life of Birds Who Never Come Down 2020-07-29T04:00:00Z Simply put, engineers are looking to create advanced hypersonic weapons that generate a “laminar” or smooth airflow boundary layer, as opposed to a “turbulent” airflow. Pentagon seeks new space tech to destroy hypersonic attacks 2020-07-20T04:00:00Z Though it may seem counterintuitive, roughening a ball’s surface delays the separation of the boundary layer and keeps a ball in turbulent flow longer. Men’s World Cup Soccer Ball, the Al Rihla, Has the Aerodynamics of a Champion 2022-11-19T05:00:00Z Referred to by scientists as a “boundary layer,” the air flow characteristics of a hypersonic weapon’s flight trajectory greatly impact the stability of the system - much of which relates to temperature. Army scientists develop new 'materials' for hypersonic weapons attack 2020-05-22T04:00:00Z With a much lower volume of air, the boundary layer at night warms more from the heat trapped by greenhouse gases. Scientists predict scorching temperatures to last through summer 2020-06-18T04:00:00Z Referred to by scientists as a “boundary layer,” the airflow characteristics of a hypersonic weapon’s flight trajectory greatly impact the stability of the system - much of which relates to temperature. Army, Air Force scientists manage hypersonic weapons' 'heat flow' 2020-03-11T04:00:00Z At hypersonic speeds, the boundary layer around the vehicle thickens, and a smooth, laminar flow can suddenly break up into eddies and swirls that cause temperature spikes on the vehicle’s skin. ‘National pride is at stake.’ Russia, China, United States race to build hypersonic weapons 2020-01-08T05:00:00Z The design features a pioneering “boundary layer suction”: 14m tiny perforations on the wing to reduce drag. Flight risk: can we take the carbon out of air travel? 2019-08-31T04:00:00Z In the vertical dimension, such data are revealing how moisture mixes in air masses and through processes at the atmospheric boundary layer. Collapsing glaciers threaten Asia’s water supplies 2019-01-01T05:00:00Z Furthermore, ions are thought to be relatively unimportant in the continental boundary layer, accounting for only around 10% of particle formation5. Ion-induced nucleation of pure biogenic particles : Nature : Nature Publishing Group 2016-05-24T04:00:00Z You need the turbulent boundary layer – provided by these strips of hair - to get the air around the corner, and you need a smooth layer for it to flow over. Tour de France 2015: stage two – live! 2015-07-05T04:00:00Z The exhaust of ships is associated with similar effects; the effluent modifies the marine boundary layer—clouds in the very low atmosphere. Satellite Sensor Reveals Earth’s Nocturnal Secrets 2015-05-19T04:00:00Z By reducing air flow over the cornea, eyelashes create a boundary layer of slow-moving air. Mote prevention 2015-02-24T05:00:00Z That heated surface air then rose into the atmospheric boundary layer — the lowest level of the troposphere — doubling its height to more than 4 kilometers, and creating a thick blanket of heat. Mega-Heatwaves Mechanism Pinpointed 2014-04-21T20:30:00Z The loss rate of condensable vapours and particles onto the chamber walls is comparable to the ambient condensation sink of the pristine boundary layer. Ion-induced nucleation of pure biogenic particles : Nature : Nature Publishing Group 2016-05-24T04:00:00Z You need the turbulent boundary layer – provided by these strips of hair - to get the air around the corner, and you need a smooth layer for it to flow over. Tour de France 2015: stage two – live! 2015-07-05T04:00:00Z “In this case, most of the fog over eastern China is free of elevated haze, and most of the pollution is trapped in the shallow winter boundary layer of a few hundred meters.” Yes, You Can See Chinese Smog From Space 2013-12-11T17:13:58Z Up to a point, the boundary layer grows thicker as the lashes grow longer. Mote prevention 2015-02-24T05:00:00Z The experimental measurements obtained at 38% RH and 278K may therefore be considered representative of a wide range of boundary layer conditions. Molecular understanding of sulphuric acid–amine particle nucleation in the atmosphere 2013-10-16T17:22:18.533Z Terrestrial radioactivity such as radon contributes additional ionization in the boundary layer over land masses72. Ion-induced nucleation of pure biogenic particles : Nature : Nature Publishing Group 2016-05-24T04:00:00Z In this case, researchers are investigating low marine boundary layer clouds over the Pacific Ocean. Mobile Lab Set to Study Clouds' Influence on Weather and Climate 2012-10-01T18:15:00.447Z Dr. Cermak’s tunnel — called an atmospheric boundary layer tunnel because it represented the layer of the atmosphere closest to Earth — changed the way buildings, bridges and other structures were built. Wind Tunnel Innovator Jack Cermak Dies at 89 2012-09-06T01:07:38Z In most cases, the updrafts stop at a boundary layer between the lower atmosphere and the stratosphere called the tropopause, often producing flat-topped clouds that resemble anvils. Strong Storms Threaten Ozone Layer Over U.S., Study Says 2012-07-26T18:55:00Z Observations in the atmospheric boundary layer are indicated by small coloured squares. Molecular understanding of sulphuric acid–amine particle nucleation in the atmosphere 2013-10-16T17:22:18.533Z The reason involves something called a boundary layer. Faster Olympic swimmers paddle like a duck, kick like a dolphin 2012-07-18T14:13:33Z Better, but— Harry beat it: glass, plastic, and a boundary layer of cold air, jetted down from the ceiling, in front of the background painting and back of the look-in window. Question of Comfort The results reported here show that nucleation in the atmospheric boundary layer is highly sensitive to trace amine levels of only a few p.p.t.v. Molecular understanding of sulphuric acid–amine particle nucleation in the atmosphere 2013-10-16T17:22:18.533Z This suggests that nucleation in different regions of the boundary layer may be controlled by different ternary vapours. Molecular understanding of sulphuric acid–amine particle nucleation in the atmosphere 2013-10-16T17:22:18.533Z Observations in the atmospheric boundary layer are indicated by small coloured squares. Molecular understanding of sulphuric acid–amine particle nucleation in the atmosphere 2013-10-16T17:22:18.533Z |
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