Results 171 to 180 of about 9,025,079 (233)

Improving quantification of methane point source emissions from imaging spectroscopy

Remote Sensing of Environment, 2023
The matched filter (MF) method is widely used for hyperspectral imaging spectrometers to detect and quantify methane point sources due to its high computational efficiency.
Zhipeng Pei, Ge Han, Huiqin Mao, Cuihong Chen, Tianqi Shi, Keyi Yang, Xin Ma, W. Gong   +7 more
semanticscholar   +1 more source

Point Source Super-resolution Via Non-convex $$L_1$$ Based Methods

Journal of Scientific Computing, 2016
In the super-resolution problem, one has to recover sparse signals \(x\in {\mathbb R}^N\) consisting only of separated peaks from frequency measurements up to a low frequency cutoff \(f_c\). Then \(\lambda_c = 1/f_c\) is called Rayleigh length of \(x\).
Yifei Lou, Penghang Yin, Jack Xin
openaire   +2 more sources

Can e-commerce alleviate agricultural non-point-source pollution? - A quasi-natural experiment based on a China's E-Commerce Demonstration City.

Science of the Total Environment, 2022
Agricultural non-point source pollution is an important driving factor that causes systemic pollution of the ecological environment and directly threatens the sustainable development of agriculture, human health, and safety.
Heng Wang, L. Fang, Hui Mao, Shaojian Chen   +3 more
semanticscholar   +1 more source

SLODAR method. Part 2: The use of point sources

Atmospheric and Oceanic Optics, 2010
The SLOpes Detection And Ranging (SLODAR) method is supplemented with the theory of the measurement of the positions of aberration layers for the case of the use of point reference sources having converging/diverging wavefronts. We determine the dependence of the shift in the correlation peak on the distance to the measured aberration layer, the ...
S. O. Galetskiy, T. Yu. Cherezova
openaire   +1 more source

Modeling of Ultrasonic Field by Distributed Point Source Method

2003
Tribikram Kundu, Dominique Placko
openaire   +2 more sources

U-Plume: automated algorithm for plume detection and source quantification by satellite point-source imagers

Atmospheric Measurement Techniques
. Current methods for detecting atmospheric plumes and inferring point-source rates from high-resolution satellite imagery are labor-intensive and not scalable with regard to the growing satellite dataset available for methane point sources.
Jack H. Bruno, D. Jervis, D. Varon, D. J. Jacob   +3 more
semanticscholar   +1 more source

Complex point-source representation of real point sources and the Gaussian beam summation method

Journal of the Optical Society of America A, 1986
A new exact representation for point sources is given in terms of complex point sources. In the simplest configuration, a point source is equivalent to a distribution of sources on the surface of a sphere in complex space. The representation can be used to consider the propagation of point disturbances through inhomogeneous media and across interfaces.
openaire   +1 more source

2. Point-source/point-receiver methods

2001
Publisher Summary This chapter explains a suite of techniques that elicit information on the elastic properties of solids using point-like excitation and detection of ultrasound. These point-source/point-receiver (PS/PR) techniques have shown great promise in several materials' inspection and characterization applications.
openaire   +1 more source

A method for predicting odour frequencies from a point source

Atmospheric Environment (1967), 1972
Abstract It is demonstrated that a fluctuating plume dispersion model can be used to give realistic estimates of odour frequencies around a point source, when the odour threshold of the chimney gases is determined by sensory methods ( Lindvall , 1970). The theoretical calculations are compared with observational results from a field experiment at and
openaire   +2 more sources

Multiple point source location via infrared array processing methods

[1990] Proceedings. The Twenty-Second Southeastern Symposium on System Theory, 2002
The detection and location of multiple targets in a noisy environment are considered. High-resolution direction-finding techniques have proved to be effective in radar and sonar multiple-target-location applications. In these problem domains, the data being modeled can be represented as a linear combination of fundamental signals whose behavior is ...
Y. Yardimci, J.A. Cadzow
openaire   +1 more source