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Articles 1 - 12 of 12
Full-Text Articles in Physical Sciences and Mathematics
A Survey Of Weed Varieties In Samanabad, Lahore, Sadaf Nazir, Beenish Zia Butt, Anjum Navid
A Survey Of Weed Varieties In Samanabad, Lahore, Sadaf Nazir, Beenish Zia Butt, Anjum Navid
Journal of Bioresource Management
A weed is an herbaceous plant that grows as a wild plant, and is considered a hindrance in the growth of preferred vegetation or cumbering the ground, and has no value for beauty or use. However, some weeds have roles in medicine, ecology and many other fields. A survey was conducted in Lahore to observe the weed varieties present in the area of Samanabad. The present study was carried out in May and June 2014.The primary purpose of the study was to gain knowledge about the availability of the total number of species present in this area. We also assessed …
The End-Cretaceous Mass Extinction And The Chicxulub Impact, Rebecca Teed
The End-Cretaceous Mass Extinction And The Chicxulub Impact, Rebecca Teed
Earth and Environmental Sciences Faculty Publications
This handout focuses on the evidence for the theory that a massive meteor impact off the coast of Mexico caused the mass extinction at the end of the Cretaceous Period. The dinosaurs and about 75% of all marine invertebrate species and many other organisms died abruptly at this time. It is part of a set of four articles on possible causes of the Permian and Cretaceous mass extinctions that can be used to organize classroom debates or to have students compare and contrast the events and their causes.
The End-Permian Mass Extinction And A Possible Massive Impact, Rebecca Teed
The End-Permian Mass Extinction And A Possible Massive Impact, Rebecca Teed
Earth and Environmental Sciences Faculty Publications
This handout examines the evidence for the theory that a massive meteor impact caused the mass extinction at the end of the Permian Period. This is the worst mass extinction known to geologists, and 90% or more of all species on Earth were wiped out. It is part of a set of four articles on possible causes of the Permian and Cretaceous mass extinctions that can be used to organize classroom debates or to have students compare and contrast the events and their causes.
The End-Cretaceous Mass Extinction And The Deccan Traps Eruptions, Rebecca Teed
The End-Cretaceous Mass Extinction And The Deccan Traps Eruptions, Rebecca Teed
Earth and Environmental Sciences Faculty Publications
This handout focuses on the evidence for the theory that a series of flood-basalt eruptions in northern India caused the mass extinction at the end of the Cretaceous Period. The dinosaurs and about 75% of all marine invertebrate species and many other organisms died abruptly at this time. This is one of a set of four articles on possible causes of the Permian and Cretaceous mass extinctions that can be used to organize classroom debates or to have students compare and contrast the events and their causes.
The End-Permian Mass Extinction And The Siberian Traps Eruptions, Rebecca Teed
The End-Permian Mass Extinction And The Siberian Traps Eruptions, Rebecca Teed
Earth and Environmental Sciences Faculty Publications
This handout focuses on the evidence for the theory that a series of flood-basalt eruptions in Siberia caused the mass extinction at the end of the Permian Period. This is the worst mass extinction known to geologists, and 90% or more of all species on Earth were wiped out. It is part of a set of four articles on possible causes of the Permian and Cretaceous mass extinctions that can be used to organize classroom debates or to have students compare and contrast the events and their causes.
Application Of Time-Frequency Analysis To Characterize Gas Shadows From The Clinton Interval In Ohio Seismic Reflection Data, Fangzhou Yan
Application Of Time-Frequency Analysis To Characterize Gas Shadows From The Clinton Interval In Ohio Seismic Reflection Data, Fangzhou Yan
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The Smoothed Pseudo Wigner-Ville Distribution (SPWVD) is one method to simultaneously resolve time series in both time and frequency domains, allowing determination of frequency variation with time in non-stationary signals. Also, SPWVD reduces the cross-term interference. This analysis was applied to stacked, migrated seismic reflection data from Ohio to characterize gas shadows produced by known and potential gas reservoirs in the Clinton interval. In northeast Ohio, the Clinton interval is identified as occurring immediately beneath the Dayton Limestone, which is known as the driller’s Packer Shell in the subsurface. The analysis was first applied to a seismic reflection line acquired …
Temporal Variation Of Mercury In Effluent From Two Municipal Wastewater Treatment Plants In Southwest Ohio, Heather Brittany Perusini
Temporal Variation Of Mercury In Effluent From Two Municipal Wastewater Treatment Plants In Southwest Ohio, Heather Brittany Perusini
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Mercury (Hg) is a toxic metal that, once converted to methylmercury by microorganisms, bioaccumulates in aquatic food webs and poses a health risk to wildlife and humans who eat fish. Wastewater treatment plants (WWTPs) are a source of Hg to surface waters, but little is known about the temporal variability of Hg concentrations in effluent and efflux to aquatic systems. I quantified the concentration of Hg in effluent from the City of Dayton (Ohio) and Ford Road (Xenia, Ohio) WWTPs and examined temporal variability over monthly and hourly time scales as well as efficiency of Hg removal. Over a 13-month …
Convergent Evolution In Tooth Morphology Of Filter Feeding Lamniform Sharks, Michaela Grace Mitchell
Convergent Evolution In Tooth Morphology Of Filter Feeding Lamniform Sharks, Michaela Grace Mitchell
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The basking shark (Cetorhinus maximus) and megamouth shark (Megachasma pelagios) are two species of filter feeding sharks, both belonging to the order Lamniformes. There are two conflicting hypotheses regarding the origins of filter feeding in Lamniform sharks; that there is a single origin of filter feeding within Lamniformes, or conversely, the filter feeding adaptations have been developed independently due to different ancestral conditions. Evidence obtained from several studies strongly supports the latter hypothesis. Because evidence suggests that C. maximus and M. pelagios have developed their filter feeding adaptations independently, we expect to see convergent evolution taking place within these two …
Spatial Variation In Tooth Shape Of Miocene Populations Of Carcharocles Megalodon Across Ocean Basins, Maxwell John Bertsos
Spatial Variation In Tooth Shape Of Miocene Populations Of Carcharocles Megalodon Across Ocean Basins, Maxwell John Bertsos
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The extinct Lamniform species, Carcharocles megalodon, were some of the most geographically widespread apex predators in the fossil record. However, whether this cosmopolitan distribution was related to population level differences is unknown. The objective of this study is to assess whether variation in tooth morphology coincided with geographic dispersal. The underlying hypothesis is that variation in an aspect of functional morphology, such as tooth shape, suggests some level of population structuring. Detecting this relationship could potentially provide a mechanism that links population to functional relationships inherent in tooth morphology that may reflect period differences in ocean basins. This would offer …
Power Distribution And Probabilistic Forecasting Of Economic Loss And Fatalities Due To Hurricanes, Earthquakes, Tornadoes, And Floods In The United States, Scott Edward Baker
Power Distribution And Probabilistic Forecasting Of Economic Loss And Fatalities Due To Hurricanes, Earthquakes, Tornadoes, And Floods In The United States, Scott Edward Baker
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Traditionally, the size of natural disaster events such as hurricanes, earthquakes, tornadoes, and floods is measured in terms of wind speed (m/sec), energy released (ergs), or discharge (m3/sec). Economic loss and fatalities from natural disasters result from the intersection of the human infrastructure and population with the natural event. This study investigates the size versus cumulative number distribution of individual natural disaster events in the United States. Economic losses are adjusted for inflation to 2014 United States Dollars (USD). The cumulative number divided by the time over which the data ranges is the basis for making probabilistic forecasts in terms …
Seismic Reflection Profiling Near Middletown, Ohio And Interpretation Of Precambrian Deformational Settings, David Joseph Peterman
Seismic Reflection Profiling Near Middletown, Ohio And Interpretation Of Precambrian Deformational Settings, David Joseph Peterman
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The reprocessing of four vibroseis seismic reflection lines at the AK Steel facility in Middletown, Ohio, provides new insight on the age, deposition, and structural deformation of the pre-Mount Simon sedimentary sequence below Butler and Warren Counties. Processing was focused on the pre-Mt. Simon reflections to reveal gently west-southwest dipping reflectors that make a slight angular unconformity with the overlying Paleozoic sedimentary strata. This pre-Mount Simon sedimentary sequence has been encountered in several wells from western Ohio, Indiana, and northern Kentucky and has been identified as the Middle Run Formation. Examination of the weak and discontinuous seismic character of the …
Application Of Geographical Information Systems To Determine Human Population Impact On Water Resources Of Yellow Springs, Ohio, And The Use Of Lidar Intensities In Land Use Classification, Gregory Geise
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The purposes of the following studies were to investigate natural and human influences on several spatial and temporal aspects of a local and regional environment. The decreasing discharge rate of the ground water supplied Yellow Spring may be caused by the increase in population of the nearby Village of Yellow Springs, Ohio. Periodic measurements of Yellow Spring's discharge rate compared to changes in the town's population showed an inverse relationship, where spring discharge declined as population grew. A sharp decrease in discharge occurred during a period when the spring's facade was modified and an airport was built partially overlying the …