Magnetic signature of different vegetation species in polluted environment

2010 ◽  
Vol 54 (3) ◽  
pp. 417-442 ◽  
Author(s):  
Diana Jordanova ◽  
Petar Petrov ◽  
Viktor Hoffmann ◽  
Tilman Gocht ◽  
Cristian Panaiotu ◽  
...  
Keyword(s):  
Polluted Environment ◽  
Magnetic Signature ◽  
Vegetation Species

scholarly journals Survival analysis of a stochastic delay single-species system in polluted environment with psychological effect and pulse toxicant input

2020 ◽  
Vol 2020 (1) ◽  
Author(s):  
Xiangjun Dai ◽  
Suli Wang ◽  
Weizhi Xiong ◽  
Ni Li
Keyword(s):  
Sufficient Conditions ◽  
Single Species ◽  
Threshold Value ◽  
Psychological Effect ◽  
Polluted Environment ◽  
Population System ◽  
Stochastic Delay ◽  
Species Population ◽  
The Mean ◽  
Single Species Population

Abstract We propose and study a stochastic delay single-species population system in polluted environment with psychological effect and pulse toxicant input. We establish sufficient conditions for the extinction, nonpersistence in the mean, weak persistence, and strong persistence of the single-species population and obtain the threshold value between extinction and weak persistence. Finally, we confirm the efficiency of the main results by numerical simulations.

Feasibility of Using Magnetic Properties for Assessment of Particle-Associated Contaminated Transport

1996 ◽  
Vol 31 (4) ◽  
pp. 741-752 ◽  
Author(s):  
T. Mayer ◽  
W.A. Morris ◽  
K.J. Versteeg
Keyword(s):  
Heavy Metal ◽  
Bottom Sediments ◽  
Magnetic Measurements ◽  
Analytical Techniques ◽  
Suspended Sediments ◽  
Hamilton Harbour ◽  
Data Comparison ◽  
Depositional Processes ◽  
Magnetic Signature ◽  
Contaminants Transport

Abstract The desire to develop rapid tools for monitoring particle-associated contaminants transport in Hamilton Harbour has led the search for fast and inexpensive tests that could be used as screening procedures prior to labour- and time-intensive conventional analytical techniques. Magnetic property measurements promised to be a viable technique if it can be shown that there is a relation between this property and contaminant concentrations in suspended and bottom sediments. Correlation between magnetic susceptibility and heavy metal concentrations in suspended and bottom sediments from Hamilton Harbour is investigated. Analyses of results from six stations and two core samples indicate that magnetic measurements provide a meaningful proxy for heavy metal analyses, and that post-depositional processes produce only very limited changes in either the magnetic and/or chemical data. Comparison of the magnetic signature and chemistry of the suspended sediments suggests that susceptibility can be used to rapidly map plume patterns in the water column.

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