A baseline study on the impact of nanoplastics on the portals of entry of xenobiotics in fish

2021 ◽  
Vol 173 ◽  
pp. 113018
Author(s):  
I. Brandts ◽  
R. Solà ◽  
M.A. Martins ◽  
A. Tvarijonaviciute ◽  
A. Barreto ◽  
...  
Keyword(s):  
Baseline Study ◽  
The Impact

scholarly journals Health Risk Evaluation for Fluoride and Nitrate and A Baseline Study of Uranium in Hard Rock Aquifers of Northern Karnataka, India

2021 ◽  
Author(s):  
Venkatesan Govindaraj ◽  
Arul Murugan Chinnandi
Keyword(s):  
Health Risk ◽  
Environmental Protection Agency ◽  
Hazard Quotient ◽  
Analytical Data ◽  
Hazard Index ◽  
The United States ◽  
Quality Data ◽  
Baseline Study ◽  
Increasing Demand ◽  
The Impact

Abstract Water is essential for life to exist on this planet.The increasing demand for clean water on one hand and the decreasing availability and deteriorating quality on the other hand has serious concern in India. Consumption of contaminated water can cause health risks. This study tries to find the impact of contamination in groundwater due fluoride and nitrate and its health risk in the Raichur district of Karnataka. And in addition to this a baseline study on presence of uranium in groundwater has also been done using laser fluorimeter instrument. For this study various literature, secondary groundwater quality data, thematic maps were collected and analyzed based on the gathered information 54 wells were chosen and samples were collected and analysed to understand the physiochemical characteristics and analytical data were compared to irrigation suitability standards and BIS drinking water standards.In the health risk assessment, we have computed the values for total hazard index and hazard quotient based on the United States Environmental Protection Agency (USEPA) guidelines.

scholarly journals Returning to periscope depth in a circular control room configuration

2020 ◽  
Author(s):  
Neville A. Stanton ◽  
Aaron P. J. Roberts ◽  
Kiome A. Pope ◽  
Daniel Fay
Keyword(s):  
Relevant Information ◽  
The Novel ◽  
Control Room ◽  
Baseline Study ◽  
Circular Configuration ◽  
Control Rooms ◽  
And Control ◽  
The Impact

Abstract Previous research has shown that co-location of operators dependent on each other for task-relevant information can relieve the previously identified bottleneck of information between the Sonar Control (SOC) and Operations Officer (OPSO) in submarine sound and control rooms. This research aimed to examine the impact of a novel inwards facing circular configuration on communications and tasks within a co-located control room. Ten teams participated in high and low demand Return to Periscope Depth scenarios in a simulated submarine control room. All communications between operators were recorded and compared with a baseline study of contemporary operation. The findings show that the novel circular configuration led to a reduction in communications, but an increase in information shared. Indicating that the teams had become more efficient at passing relevant information. Furthermore, teams were able to complete a greater number of tasks.

Formation of Lunar Craters and Bright Rays as a Result of Meteorite Impacts

1962 ◽  
Vol 14 ◽  
pp. 415-418
Author(s):  
K. P. Stanyukovich ◽  
V. A. Bronshten
Keyword(s):  
Explosive Charge ◽  
The Moon ◽  
Meteorite Impacts ◽  
The Earth ◽  
Lunar Craters ◽  
The Impact

The phenomena accompanying the impact of large meteorites on the surface of the Moon or of the Earth can be examined on the basis of the theory of explosive phenomena if we assume that, instead of an exploding meteorite moving inside the rock, we have an explosive charge (equivalent in energy), situated at a certain distance under the surface.

The Geosciences Applied to Lunar Exploration

1962 ◽  
Vol 14 ◽  
pp. 169-257 ◽  
Author(s):  
J. Green
Keyword(s):  
Lunar Surface ◽  
Probable Mechanism ◽  
Point Of View ◽  
Lunar Exploration ◽  
Geological Model ◽  
Apply Geophysics ◽  
Surface Features ◽  
The Impact

The term geo-sciences has been used here to include the disciplines geology, geophysics and geochemistry. However, in order to apply geophysics and geochemistry effectively one must begin with a geological model. Therefore, the science of geology should be used as the basis for lunar exploration. From an astronomical point of view, a lunar terrain heavily impacted with meteors appears the more reasonable; although from a geological standpoint, volcanism seems the more probable mechanism. A surface liberally marked with volcanic features has been advocated by such geologists as Bülow, Dana, Suess, von Wolff, Shaler, Spurr, and Kuno. In this paper, both the impact and volcanic hypotheses are considered in the application of the geo-sciences to manned lunar exploration. However, more emphasis is placed on the volcanic, or more correctly the defluidization, hypothesis to account for lunar surface features.

Asteroid and Comet Impact Speeds upon Mars: Significance for Panspermia and the Supply of Organics

1997 ◽  
Vol 161 ◽  
pp. 197-201 ◽  
Author(s):  
Duncan Steel
Keyword(s):  
Probability Distributions ◽  
Regions Of Interest ◽  
Significant Fraction ◽  
Organic Chemicals ◽  
Impact Speed ◽  
The Mean ◽  
The Impact

AbstractWhilst lithopanspermia depends upon massive impacts occurring at a speed above some limit, the intact delivery of organic chemicals or other volatiles to a planet requires the impact speed to be below some other limit such that a significant fraction of that material escapes destruction. Thus the two opposite ends of the impact speed distributions are the regions of interest in the bioastronomical context, whereas much modelling work on impacts delivers, or makes use of, only the mean speed. Here the probability distributions of impact speeds upon Mars are calculated for (i) the orbital distribution of known asteroids; and (ii) the expected distribution of near-parabolic cometary orbits. It is found that cometary impacts are far more likely to eject rocks from Mars (over 99 percent of the cometary impacts are at speeds above 20 km/sec, but at most 5 percent of the asteroidal impacts); paradoxically, the objects impacting at speeds low enough to make organic/volatile survival possible (the asteroids) are those which are depleted in such species.

Organic Syntheses During the Impact of a Comet with a Gaseous Planet

1997 ◽  
Vol 161 ◽  
pp. 189-195
Author(s):  
Cesare Guaita ◽  
Roberto Crippa ◽  
Federico Manzini
Keyword(s):  
Polymeric Material ◽  
Molecular Form ◽  
Parent Compound ◽  
Blue Filter ◽  
Organic Syntheses ◽  
The Impact

AbstractA large amount of CO has been detected above many SL9/Jupiter impacts. This gas was never detected before the collision. So, in our opinion, CO was released from a parent compound during the collision. We identify this compound as POM (polyoxymethylene), a formaldehyde (HCHO) polymer that, when suddenly heated, reformes monomeric HCHO. At temperatures higher than 1200°K HCHO cannot exist in molecular form and the most probable result of its decomposition is the formation of CO. At lower temperatures, HCHO can react with NH3 and/or HCN to form high UV-absorbing polymeric material. In our opinion, this kind of material has also to be taken in to account to explain the complex evolution of some SL9 impacts that we observed in CCD images taken with a blue filter.

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