Results 231 to 240 of about 5,612,666 (297)

Effect of precision air supply cooling system with different cooling air speed on reproductive performance, stress status, immunoglobulin and fecal microbiota of lactating sows.

Journal of Thermal Biology, 2022
This study investigated the precision air supply cooling system with different cooling air speed on reproductive performance, stress status, immunity and intestinal microbiota of sows.
Xiaojun Zhang, Linfang Yang, Meizhi Wang, J. Zeng, S. Long, T. He, Zhaohui Chen   +6 more
semanticscholar   +1 more source

Air-Speed Indicators

Aeronautical journal (London, England : 1897), 1914
openaire   +2 more sources

Influences of ambient air speed and internal heat load on the performance of solar chimney in the tropics

Solar Energy, 2014
Nyuk Hien Wong
exaly   +2 more sources

Self-aeration development and fully cross-sectional air diffusion in high-speed open channel flows

Journal of Hydraulic Research, 2022
Self-aeration in open channel flows occurs owing to free surface air entrainment. Self-aeration development and fully cross-sectional distribution of air concentration are not thoroughly understood.
Wang-ru Wei, Wei-lin Xu, Jun Deng, Yakun Guo   +3 more
semanticscholar   +1 more source

On the Speed of Sound in Air

The Physics of Fluids, 1959
In a high-temperature gas, the speed of sound depends upon the chemical composition, sound frequency, and chemical reaction rates. Two limiting sound speeds are normally distinguished: that of ``frozen'' or constant chemical composition, and the ``equilibrium'' sound speed.
Gross, R. A., Eisen, C. L.
openaire   +2 more sources

High-speed rail and air transport competition and cooperation: A vertical differentiation approach

Transportation Research Part B: Methodological, 2016
Anming Zhang, Wenyi Xia
exaly   +2 more sources

High-speed Rail's impact on airline demand and air carbon emissions in China

, 2021
We construct an extensive data set comprising all air and high-speed rail (HSR) routes in China. We estimate that commercial air travel emits seven times the carbon emissions per passenger kilometer than HSR. Results demonstrate a strong link between air
Jack Strauss, Hongchang Li, J. Cui
semanticscholar   +1 more source

The effects of atmospheric stability with low wind speed and of air pollution on the accelerated transmission dynamics of COVID-19

, 2020
The goal of this study is to explain the relation among atmospheric stability/turbulence (considering wind speed), air pollution and the spread of COVID-19 to provide insights into environmental risk factors of specific regions.
M. Coccia
semanticscholar   +1 more source

A Fluidic Low-Speed Air-Speed Indicator

Journal of Aircraft, 1970
Crossflow and parallel flow techniques were investigated. The parallel flow technique was chosen. A prototype has been wind-tunnel tested. It has a near linear response from 0.3 to 90 fps. This sensor is light in weight, simple in operation and has no moving parts. Efforts are underway to optimize the sensor performance and develop a flightworthy unit.
openaire   +1 more source

Speed Control for the Air-Driven Centrifuge

Review of Scientific Instruments, 1947
A method based on some work of Thomas Davis is described for controlling the rotor speed of an air-driven ultracentrifuge. A permanent magnet mounted on the shaft of the centrifuge induces an e.m.f. in a series inductance, capacity resistance circuit which has the same frequency as the rotor.
J W, BEAMS, F W, LINKE, P, SOMMER
openaire   +2 more sources