Results 181 to 190 of about 18,997 (237)

Evaporation Duct Refractivity Profile Models

2006 European Microwave Conference, 2006
Four most prevailing models for evaporation duct refractivity profile calculation based on the Monin-Obukhov similarity theory have been examined. The results of computations have been compared with the experimental data obtained by us during two marine expeditions.
Iu. Levadnyi, V. Ivanov, V. Shalyapin
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Evaporation-Induced Clogging of an Artificial Sweat Duct

ACS Applied Materials & Interfaces, 2020
Metal-based antiperspirants have been in use for centuries; however, there is an increasing consumer demand for a metal-free alternative that works effectively. Here, we develop an artificial sweat duct rig and demonstrate an alternative, metal-free approach to antiperspiration.
Venkata Yashasvi Lolla, Pranav Shukla, Stevan D. Jones, Jonathan B. Boreyko   +3 more
openaire   +2 more sources

Assessment of evaporation duct propagation simulation

2011 XXXth URSI General Assembly and Scientific Symposium, 2011
The evaporation duct strongly influence microwave radars and communication systems. For evaluation of their performance in such environment combination of split-step parabolic equation and Monin-Obukhov similarity theory are usual approach. There are several variants of semiempirical functions used in the similarity theory which leads to different ...
Iurii Levadnyi, Victor Ivanov, Vyacheslav Shalyapin   +2 more
openaire   +1 more source

Statistical assessment of evaporation duct propagation

IEEE Transactions on Antennas and Propagation, 1990
Over-the-horizon propagation from 0.6 to 18 GHz is presented in the form of accumulated frequency distributions of path loss, showing the comparisons between theory and two measurement programs. The path-loss theory is based on waveguide solutions for a family of refractivity/height profiles characterized by evaporation duct height in the range of 1 to
H. Hitney, R. Vieth
openaire   +1 more source

Optimal Antenna Position Inside Evaporation Duct

2018 IEEE Radio and Antenna Days of the Indian Ocean (RADIO), 2018
This paper is devoted to the investigation of an evaporation duct in the context of its impact on microwave links communication stability. The work contains the numerical results for previously developed mathematical model based on using the method of dyadic Green's functions.
Denis Serebriakov, Renat Abdullin
openaire   +1 more source

Evaporative Cooling in Forced Duct Flow

Transactions of the Canadian Society for Mechanical Engineering, 1975
The cooling of inside surfaces of heated ducts by the process of forced convection with evaporation is studied. Cooling is achieved by liquid-evaporation from the duct surface into a turbulent gas flow. An analysis is developed for predicting the stream and surface temperatures. Data are presented for air-water mixtures.
M.A. Kellow, J.H. VanSant, M. Tarabulsy
openaire   +1 more source

A modern global evaporation duct climatology

2008 International Conference on Radar, 2008
Climatologies of evaporation duct conditions over the worldpsilas ocean areas are important for radar system design studies and operational planning. The evaporation duct climatology currently in use by the U.S. Navy was developed in the mid-1980s.
Paul A. Frederickson, J. Thomas Murphree, Katherine L. Twigg, Amalia Barrios   +3 more
openaire   +1 more source

Study on NPS Evaporation Duct Model

2010 6th International Conference on Wireless Communications Networking and Mobile Computing (WiCOM), 2010
Over the ocean, there is mutual effect between air and sea. This effect would affect atmospheric refractivity, or modified atmospheric refractivity, and a lot of kinds of the profiles of atmospheric refractivity and modified atmospheric refractivity will happen.
Ning Zhang, Nan Li, Bin Tian, Hao Cha, Mo Zhou   +4 more
openaire   +1 more source

Uncertainty quantification of propagation in evaporation ducting

2016 URSI International Symposium on Electromagnetic Theory (EMTS), 2016
The Fourier split-step method is used for solving parabolic equations in, for example, computational electromagnetics. In this paper we develop a spectral based Fourier split-step method that will take a limited degree of information with regard to the refractive index of the atmosphere into account.
M. Enstedt, N. Wellander
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Understanding Evaporation Duct Variabilities on Turbulent Eddy Scales

Journal of Geophysical Research: Atmospheres, 2022
AbstractEvaporative Ducts (ED) are common refractive features that exist due to the persistent/strong vertical moisture gradient inherent to the lowest 10s of meters of the marine atmospheric surface layer (MASL). The ED plays a large role in the propagation of signals from the surface‐ or ship‐based radar/communications systems due to the ducting of ...
K. B. Franklin, Q. Wang, Q. Jiang, L. Shen   +3 more
openaire   +1 more source