Results 31 to 40 of about 18,997 (237)

Estimating Range-Dependent Evaporation Duct Height

Journal of Atmospheric and Oceanic Technology, 2017
AbstractThe refractivity from clutter (RFC) technique has been proved to be an effective way to estimate atmospheric duct structure. An important issue for RFC is how to make the estimate more robust, especially in range-dependent ducting conditions. Traditionally, statistical inversion methods need a large number of forward propagation model runs to ...
Xiaofeng Zhao, Caglar Yardim, Dongxiao Wang, Bruce M. Howe   +3 more
openaire   +1 more source

Dysfunction of the meibomian glands in patients with diabetes mellitus

Сахарный диабет, 2022
The prevalence of diabetes mellitus has increased in recent decades. The most common ophthalmic manifestations of diabetes mellitus are retinopathy, epitheliopathies, corneal erosion and dry eye syndrome, the symptoms of which are more pronounced than in
T. N. Safonova, E. S. Medvedeva
doaj   +1 more source

Organic aerosol formation downwind from the Deepwater Horizon oil spill. [PDF]

, 2011
A large fraction of atmospheric aerosols are derived from organic compounds with various volatilities. A National Oceanic and Atmospheric Administration (NOAA) WP-3D research aircraft made airborne measurements of the gaseous and aerosol composition of ...
Ahmadov, R, Atlas, EL, Bahreini, R, Blake, DR, Brioude, J, Brock, CA, de Gouw, JA, Fahey, DW, Fehsenfeld, FC, Holloway, JS, Le Henaff, M, Lueb, RA, McKeen, SA, Meagher, JF, Middlebrook, AM, Murphy, DM, Paris, C, Parrish, DD, Perring, AE, Pollack, IB, Ravishankara, AR, Robinson, AL, Ryerson, TB, Schwarz, JP, Spackman, JR, Srinivasan, A, Warneke, C, Watts, LA   +27 more
core   +1 more source

Statistical Analysis of Atmospheric Ducts in the Yellow and Bohai Seas of China and Study of Their Electromagnetic Wave Propagation Characteristics

Atmosphere
Atmospheric ducts play a critical role in the propagation of electromagnetic waves by minimizing signal loss and extending transmission distances, which is essential for radar, communication, and navigation systems.
Xiao Yang, Lei Li, Leke Lin, Rui Zhang, Shuaishuai Liang, Zhenwei Zhao   +5 more
doaj   +1 more source

BEYOND-THE-HORIZON RADIO WAVE PROPAGATION AND SURFACE OBJECTS RADAR OBSERVATION IN THE NORTH-WESTERN AREA OF THE PACIFIC OCEAN [PDF]

Радиофизика и электроника, 2016
In general, the coverage range of vessel navigation radars in different areas of the World Ocean is determined by radio wave propagation conditions in these areas.
F. V. Kivva, I. M. Mytsenko, A. N. Roenko   +2 more
doaj   +1 more source

A New Short-Term Prediction Method for Estimation of the Evaporation Duct Height

IEEE Access, 2020
Evaporation duct is a kind of chaotic phenomenon over the ocean. In this paper, a new nonlinear prediction algorithm, the Darwinian evolutionary algorithm (DEA), is introduced to obtain the specific nonlinear formula P(·) of the chaotic phenomenon.
Yanbo Mai, Zheng Sheng, Hanqing Shi, Chaolei Li, Qixiang Liao, Jun Bao   +5 more
doaj   +1 more source

A Comprehensive Study on Maximum Wavelength of Electromagnetic Propagation in Different Evaporation Ducts

IEEE Access, 2019
The maximum wavelength describes trapping features when considering electromagnetic wave propagation in an evaporation duct. However, the results vary between the existing methods used to calculate the maximum wavelength in an evaporation duct.
Yang Shi, Qi Zhang, Shuwen Wang, Kunde Yang, Yixin Yang, Xidang Yan, Yuanliang Ma   +6 more
doaj   +1 more source

An Improved Split-Step Wavelet Transform Method for Anomalous Radio Wave Propagation Modelling [PDF]

, 2014
Anomalous tropospheric propagation caused by ducting phenomenon is a major problem in wireless communication. Thus, it is important to study the behavior of radio wave propagation in tropospheric ducts.
Iqbal, A., Jeoti, V.
core   +1 more source

Experimental investigation on performance of fabrics for indirect evaporative cooling applications [PDF]

, 2016
© 2016 Indirect evaporative cooling, by using water evaporation to absorb heat to lower the air temperature without adding moisture, is an extremely low energy and environmentally friendly cooling principle.
Fancey, Kevin S., Ma, Xiaoli, Xu, Peng, Zhao, Xudong   +3 more
core   +1 more source

Porous materials in building energy technologies—a review of the applications, modelling and experiments [PDF]

, 2018
Improving energy efficiency in buildings is central to achieving the goals set by Paris agreement in 2015, as it reduces the energy consumption and consequently the emission of greenhouse gases without jeopardising human comfort.
Esfahani, Javad Abolfazli, Karimi, Nader, Rashidi, Saman   +2 more
core   +1 more source