| 单词 | laminar |
| 例句 | One of the NACAs great contributions to aerodynamics was a series of laminar flow airfoils, wing shapes designed to maximize the flow of smooth air around the wing. Hidden Figures 2016-09-06T00:00:00Z The P-51 Mustang was the first production plane to use one of the NACAs laminar airfoils, a factor that contributed to its superior performance. Hidden Figures 2016-09-06T00:00:00Z His hands switch from ballistic spasms to soft curves, from smooth, laminar arcs to short, sharp chops, within the span of a single verse, ranging over a rich landscape of tones. Deaf rapper Sean Forbes makes himself joyfully heard on the hip-hop scene 2015-01-25T05:00:00Z And we ran after the siren lights broke the cool, laminar orbits of our youth. Oliver de la Paz's poem 'Last Days' 2010-04-28T23:17:00Z In this case, the wake of air behind the ball is somewhat regular and is called laminar flow. Men’s World Cup Soccer Ball, the Al Rihla, Has the Aerodynamics of a Champion 2022-11-19T05:00:00Z The pressure drop along a length of artery is 100 Pa, the radius is 10 mm, and the flow is laminar. College Physics for AP Courses 2015-08-12T00:00:00Z Turbulent flow is more effective than laminar flow at keeping sediments in suspension. Physical Geology 2015-01-01T00:00:00Z Some low-gooseneck bathroom faucets feature laminar flowing spouts to conserve water and prevent splashing. Gooseneck bathroom faucet rises to the occasion 2021-10-04T04:00:00Z 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 It turns out that a soccer ball’s drag coefficient is approximately 2.5 times larger for laminar flow than for turbulent flow. Men’s World Cup Soccer Ball, the Al Rihla, Has the Aerodynamics of a Champion 2022-11-19T05:00:00Z Neglecting air resistance but not the resistance of the pipe, and assuming laminar flow, calculate the gauge pressure at the entrance of the 50.0-m- long vertical pipe. College Physics for AP Courses 2015-08-12T00:00:00Z 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 All of this leads to a current area of focus for scientists, who are experimenting with more ways to ensure laminar air-flow boundaries surround hypersonic flight vehicles. Army, Air Force scientists manage hypersonic weapons' 'heat flow' 2020-03-11T04:00:00Z At hypersonic speeds, laminar air flow over a surface can suddenly turn turbulent, creating intense temperature spikes on the vehicle’s surface. ‘National pride is at stake.’ Russia, China, United States race to build hypersonic weapons 2020-01-08T05:00:00Z When it comes to making a good soccer ball, the speed at which the air flow transitions from turbulent to laminar is critical. Men’s World Cup Soccer Ball, the Al Rihla, Has the Aerodynamics of a Champion 2022-11-19T05:00:00Z Can the flow in either possibly be laminar? College Physics for AP Courses 2015-08-12T00:00:00Z In some cell types, the expression of certain genes correlated with precise laminar position. A recipe book for cell types in the human brain 2019-08-20T04:00:00Z In summary, as opposed to microscopic exchanges in mass known to occur in laminar boundary layers, turbulent boundary layers involve mixing across layers on a macroscopic level, the paper explains. 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 If laminar flow starts at too high a speed, the ball begins to slow down much more quickly than a ball that maintains turbulent flow for longer. Men’s World Cup Soccer Ball, the Al Rihla, Has the Aerodynamics of a Champion 2022-11-19T05:00:00Z Explore all types of flow, such as visible, implied, turbulent, laminar, and so on, present in this scene. College Physics for AP Courses 2015-08-12T00:00:00Z Together, these studies challenge long-held assumptions about the discrete laminar organization of neuronal cell types in the cerebral cortex. A recipe book for cell types in the human brain 2019-08-20T04:00:00Z In order to make the ball move more in the air, Bauer analyzes its path the instant it leaves his fingers, and studies a principle in fluid dynamics called the laminar effect. Briefly Noted Book Reviews 2019-08-12T04:00:00Z Shumate loves the new “laminar flow” faucets, which reduces splash and spatter in the shallower vessel sinks. Expert tips for updating your kitchen and bath | Provided by Seattle Home Show 2019-02-06T05:00:00Z When air flow transitions from turbulent to laminar flow, the drag coefficient rises rapidly. Men’s World Cup Soccer Ball, the Al Rihla, Has the Aerodynamics of a Champion 2022-11-19T05:00:00Z Layers flow without mixing when flow is laminar. College Physics for AP Courses 2015-08-12T00:00:00Z A question to him about pitching mechanics is likely to get a response that includes phrases such as “laminar flow” and “elastic energy.” A man and his drone: Indians’ pitcher Trevor Bauer marshals eccentricities 2016-10-16T04:00:00Z "The failure of the laminar air flow system has had quite an impact on our theatre cancellations this month." Ventilation failure blamed for cancelled Borders operations - BBC News 2015-10-06T04:00:00Z Mammalian brains have evolved with what is called a laminar structure, in which brain cells are organized in six layers that make up the cerebral cortex, or forebrain. Who ya callin’ bird brain? 2015-06-22T04:00:00Z There are limits to his confidence: Greece is also in the laminar region, but its economy is not growing smoothly. Physicists make 'weather forecasts' for economies 2015-02-22T05:00:00Z We shall concentrate on laminar flow for the remainder of this section, leaving certain aspects of turbulence for later sections. College Physics for AP Courses 2015-08-12T00:00:00Z Inside a room with negative air pressure, researchers retrieve blood samples from an incubator and place them in a laminar flow hood, which draws up a stream of air. Can AIDS Be Cured? | The New Yorker 2014-12-15T05:00:00Z Cultivating innovation is essential to creating new jobs and fostering a dynamic, competitive, and resilient economy but it requires an almost laminar flow of collaboration between private, public, and academic organizations to be effective. The 'Hickenlooper Effect': How Colorado's Governor Recruited Entrepreneurs To Drive An Economic Recovery 2014-11-06T05:00:00Z He also developed a new natural laminar flow wing and fuselage nose for the light jet with the application of a new concept composite construction to the fuselage structure. BusinessAviationVoice: Fujino: The Ultimate Accolade 2014-09-07T04:00:00Z That phenomenon is known in fluid mechanics as ‘laminar flow’. Physicists make 'weather forecasts' for economies 2015-02-22T05:00:00Z There is more interaction, greater heating, and more resistance than in laminar flow. College Physics for AP Courses 2015-08-12T00:00:00Z A previous experiment measured unexpectedly high dimer concentrations in a laminar flow tube and concluded that a stabilizing contaminant must be present, although none was measured. Molecular understanding of sulphuric acid–amine particle nucleation in the atmosphere 2013-10-16T17:22:18.533Z The female kind is bright and friable, laminar and not globular. De Re Metallica, Translated from the First Latin Edition of 1556 2011-11-16T03:00:21.977Z Understanding what causes the transition from laminar to turbulent flow requires massive mathematical and computing power. The aircraft of the future: Plane truths 2011-03-10T10:55:19Z Should this happen to be terminated by a second laminar portion, an interrupted leaf would be formed. Vegetable Teratology An Account of the Principal Deviations from the Usual Construction of Plants Sometimes we can predict if flow will be laminar or turbulent. College Physics for AP Courses 2015-08-12T00:00:00Z This laminar coagulation by constant additions gradually fills the aneurysmal cavity and the pulsation in the sac then ceases; contraction of the sac and its contents gradually takes place and the aneurysm is cured. Encyclopaedia Britannica, 11th Edition, Volume 2, Part 1, Slice 1 There is always something deeper than anything said—something of which all human, all divine words, figures, pictures, motion-forms, are but the outer laminar spheres through which the central reality shines more or less plainly. Unspoken Sermons Series I., II., and II. The sea-breeze was delicious; the lapping, dazzling stream made sweet music, and the huge cotton-trees with laminar buttresses gave most grateful shade. To the Gold Coast for Gold A Personal Narrative in Two Volumes.—Volume I In Primula or Pedicularis, where the venation is clearly laminar, the tubular portion is distinctly calycine. Vegetable Teratology An Account of the Principal Deviations from the Usual Construction of Plants We know that flow in a very smooth tube or around a smooth, streamlined object will be laminar at low velocity. College Physics for AP Courses 2015-08-12T00:00:00Z After long fasting they ate as much as five ounces of a silvery green and very flexible laminar talc. Personal Narrative of Travels to the Equinoctial Regions of America, During the Year 1799-1804 — Volume 2 This variety is a compound of feldspar and quartz, so arranged as to produce an imperfect laminar structure. The Student's Elements of Geology These minerals occasionally assume a laminar or foliated arrangement. Geological Observations on South America The blood flow through most of the body is a quiet, laminar flow. College Physics for AP Courses 2015-08-12T00:00:00Z In fact, at intermediate velocities, flow may oscillate back and forth indefinitely between laminar and turbulent. College Physics for AP Courses 2015-08-12T00:00:00Z Flow of the stationary fluid around a moving object may be laminar, turbulent, or a combination of the two. College Physics for AP Courses 2015-08-12T00:00:00Z If N′R is less than about 1, flow around the object can be laminar, particularly if the object has a smooth shape. College Physics for AP Courses 2015-08-12T00:00:00Z Depending on the surface, there can be a turbulent wake behind the object with some laminar flow over its surface. College Physics for AP Courses 2015-08-12T00:00:00Z For an N′R between 10 and 106 , the flow may be either laminar or turbulent and may oscillate between the two. College Physics for AP Courses 2015-08-12T00:00:00Z Figure 12.18 Flow is laminar in the large part of this blood vessel and turbulent in the part narrowed by plaque, where velocity is high. College Physics for AP Courses 2015-08-12T00:00:00Z Here the flow is laminar with N′R less than 1. College Physics for AP Courses 2015-08-12T00:00:00Z Pressure in the wake is less than in front of the sphere, because fluid speed is less, creating a net force to the left F′V that is significantly greater than for laminar flow. College Physics for AP Courses 2015-08-12T00:00:00Z The precise definition of viscosity is based on laminar, or nonturbulent, flow. College Physics for AP Courses 2015-08-12T00:00:00Z Before we can define viscosity, then, we need to define laminar flow and turbulent flow. College Physics for AP Courses 2015-08-12T00:00:00Z In the transition region, the flow can oscillate chaotically between laminar and turbulent flow. College Physics for AP Courses 2015-08-12T00:00:00Z The smooth flow is called laminar flow, whereas the swirls and eddies typify turbulent flow. College Physics for AP Courses 2015-08-12T00:00:00Z Streamlines are smooth and continuous when flow is laminar, but break up and mix when flow is turbulent. College Physics for AP Courses 2015-08-12T00:00:00Z Care is taken to insure that the flow is laminar; that is, the layers do not mix. College Physics for AP Courses 2015-08-12T00:00:00Z Figure 12.13 The graphic shows laminar flow of fluid between two plates of area A . College Physics for AP Courses 2015-08-12T00:00:00Z An indicator called the Reynolds number NR can reveal whether flow is laminar or turbulent. College Physics for AP Courses 2015-08-12T00:00:00Z Do you expect the air flow to be laminar or turbulent? College Physics for AP Courses 2015-08-12T00:00:00Z For N′R less than about one, flow is laminar. College Physics for AP Courses 2015-08-12T00:00:00Z |
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