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Articles 149311 - 149340 of 294699

Full-Text Articles in Physical Sciences and Mathematics

Levels Of Formaldehyde And Acetaldehyde In Selected Bottled Drinking Water Sold In Urban Areas In Tanzania, Esther H.J. Lugwisha, John A.M. Mahugija, Christopher Mwankuna Jul 2016

Levels Of Formaldehyde And Acetaldehyde In Selected Bottled Drinking Water Sold In Urban Areas In Tanzania, Esther H.J. Lugwisha, John A.M. Mahugija, Christopher Mwankuna

Tanzania Journal of Science

The levels of formaldehyde and acetaldehyde in bottled drinking water and the effect of storage time and storage conditions on their levels were determined. A total of 144 samples of six brands of bottled drinking water were purchased from Dar es Salaam, Iringa, Mwanza and Arusha regions in Tanzania. Analysis was performed using HPLC on the 1st day and after 14 and 42 days of storage in a refrigerator, at room temperature and exposure to sunlight. The levels of formaldehyde and acetaldehyde in the refrigerated samples ranged from 2.46 to 19.25 μg/L and from not detected (ND) to 58.70 μg/L, …

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Petrographic And Geochemical Characteristics Of The Kiejo, Rungwe And Ngozi Volcanic Rocks, Southern Tanzania: Implication For Tectonic Activities And Magmatic Differentiation, Athanas S. Macheyeki Jul 2016

Petrographic And Geochemical Characteristics Of The Kiejo, Rungwe And Ngozi Volcanic Rocks, Southern Tanzania: Implication For Tectonic Activities And Magmatic Differentiation, Athanas S. Macheyeki

Tanzania Journal of Science

Rock samples were collected from the Kiejo, Rungwe and Ngozi volcanoes, southern Tanzania. Results show that, in the Ngozi and Rungwe volcanoes, magma cooled relatively fast. After large part of the magma had crystallized, nucleation of crystals at a relatively slow rate crystallized from interstitial fluids of the primary magma that had already crystallized fine grained minerals resulting into large grains of minerals. In the Kiejo volcano, both zoned and unzonned olivine crystals exist; unzoned crystals being primary and the zoned ones are secondary. Such observations also indicate that the magma responsible for these rocks had interstitial fluids that crystallized …

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Performance Of Water Filters Towards The Removal Of Selected Pollutants In Arusha, Tanzania, Beatrice Kiagho, Revocatus Machunda, Askwar Hilonga, Karoli N. Njau Jul 2016

Performance Of Water Filters Towards The Removal Of Selected Pollutants In Arusha, Tanzania, Beatrice Kiagho, Revocatus Machunda, Askwar Hilonga, Karoli N. Njau

Tanzania Journal of Science

This paper presents the findings of a study carried out to investigate the efficiency of selected common water filters in the removal of Escherichia coli, organic matter and fluoride. Additionally, the Total Suspended Solids, Turbidity and colour were also considered for assessing the performance of the filters in ensuring safe water provision. The results showed that various filters performed differently at particular retention times. Removal of Escherichia coli, was found to be 100%, 75%, 96%, 96.5, 98.5%forbio-sand, slow sand, ceramic, bone char and membrane purifier respectively. Organic matter removal was found to be 47%, 43%, 53%, 43.4% for bio-sand, slow …

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Spread Of Tylodelphys Mashonense (Digenea: Diplostomidae) By Grey Heron Ardea Cinerea And Great White Egret A. Alba In Lake Victoria, Tanzania, Fred D. Chibwana, Gamba Nkwengulila Jul 2016

Spread Of Tylodelphys Mashonense (Digenea: Diplostomidae) By Grey Heron Ardea Cinerea And Great White Egret A. Alba In Lake Victoria, Tanzania, Fred D. Chibwana, Gamba Nkwengulila

Tanzania Journal of Science

Despite the fact that Tylodelphys mashonense, parasites of the cranial cavity of the catfish Clarias gariepinus, are ubiquitous in freshwater systems, little is known on their spread. As such, we examined a total of 152 piscivorous birds, belonging to 6 species; 43 great cormorant Phalacrocorax carbo, 33 grey heron Ardea cinerea, 26 hamerkop Scopus umbretta, 22 great white egret Ardea alba, 15 marabou stork Leptoptilos crumeniferus and 13 pied kingfisher Ceryle rudis foraging in the Lake Victoria. Out of the six bird species only A. cinerea and A. alba were found infected by T. mashonense with prevalence of 42.4% and …

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Assessment Of Dairy Wastewater Treatment And Its Potential For Biogas Production At Tanga Fresh Limited, Anna S. Nyaki, Karoli N. Njau Jul 2016

Assessment Of Dairy Wastewater Treatment And Its Potential For Biogas Production At Tanga Fresh Limited, Anna S. Nyaki, Karoli N. Njau

Tanzania Journal of Science

The extent of pollution of dairy wastewater treated in a septic tank and its potential for biogas production was investigated. Performance of the existing treatment system was assessed through characterization of both raw and treated effluents. From the analysis parameters like Chemical Oxygen Demand (COD), Biochemical Oxygen Demand (BOD5), Total Suspended Solids (TSS), alkalinity, turbidity, color and phosphorus disclosed inadequate system performance with treated effluent displaying higher values of organic matter than the allowed discharge limits according to the national standards. Optimal conditions for biogas production such as temperature, pH and type of inoculum were determined through batch experiments. The …

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Cl In The Early Solar System, Jeffrey Williams Jul 2016

Cl In The Early Solar System, Jeffrey Williams

Earth and Planetary Sciences ETDs

The early solar nebula is thought to have been a turbulent disk of dust and gas. An unknown mechanism caused the disk to collapse, such as a nearby super nova. This collapse led to high temperatures and high particle densities at the mid-plane of the disk. An unknown mechanism caused the temperature in local area to become hot enough to cause some material to melt –creating the first igneous material of the solar system. These melt spherules, called chondrules, cooled and accreted together with dust and ice to form larger bodies called chondrites. Once the chondritic bodies were of sufficient …

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Laboratory And Field Evaluation Of Entomopathogenic Fungi For The Control Of Amitraz-Resistant And Susceptible Strains Of Rhipicephalus Decoloratus, Mercy M. Murigu, Paulin Nana, Robert M. Waruiru, Chege J. Nga'nga', Sunday Ekesi, Nguya K. Maniania Jul 2016

Laboratory And Field Evaluation Of Entomopathogenic Fungi For The Control Of Amitraz-Resistant And Susceptible Strains Of Rhipicephalus Decoloratus, Mercy M. Murigu, Paulin Nana, Robert M. Waruiru, Chege J. Nga'nga', Sunday Ekesi, Nguya K. Maniania

All Peer-Reviewed Publications

Rhipicephalus decoloratus causes serious economic losses in cattle industry every year in East Africa. Biological control using entomopathogenic fungi is seen as a promising alternative to chemical acaricides being used for their control. The pathogenicity of Metarhizium anisopliae and of Beauveria bassiana isolates was tested in the laboratory against amitraz-resistant and amitraz-susceptible strains of R. decoloratus. Unfed larvae were sprayed with conidial suspensions of 1 × 109 conidia ml-1. Fungal isolates were pathogenic to R. decoloratus larvae, causing mortality of between 10.0 and 100% and between 12.1 and 100% of amitraz-susceptible and amitraz-resistant strains, respectively. The LT50 values of selected …

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Modeling The Timeliness Of Airborne Remote Sensing Data, Andrew Loerch Jul 2016

Modeling The Timeliness Of Airborne Remote Sensing Data, Andrew Loerch

Geography ETDs

The model, “Remote Sensing Communication Model” (RSCM), which permits the estimation of the timeliness of remote sensing systems (RSS) is tested (Lippitt, Stow, & Clarke, 2014). This model conceptualizes RSS as having capacities that determine the timeliness of the systems, where a system is comprised of three segments, each with a capacity that determines the timeliness of that segment: acquisition capacity, transmission capacity, and receiver capacity (i.e., the capacity of a human and/or machine analyst to produce information) (Lippitt et al., 2014). Acquisition and transmission capacity analyses are run to aid in the optimization of a flexible time-sensitive remote sensing …

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Simulations Of The Angular Dependence Of The Dipole-Dipole Interaction Among Rydberg Atoms, Jacob L. Bigelow, Jacob T. Paul, Matan Peleg, Veronica L. Sanford, Thomas J. Carroll, Michael W. Noel Jul 2016

Simulations Of The Angular Dependence Of The Dipole-Dipole Interaction Among Rydberg Atoms, Jacob L. Bigelow, Jacob T. Paul, Matan Peleg, Veronica L. Sanford, Thomas J. Carroll, Michael W. Noel

Physics and Astronomy Faculty Publications

The dipole-dipole interaction between two Rydberg atoms depends on the relative orientation of the atoms and on the change in the magnetic quantum number. We simulate the effect of this anisotropy on the energy transport in an amorphous many atom system subject to a homogeneous applied electric field. We consider two experimentally feasible geometries and find that the effects should be measurable in current generation imaging experiments. In both geometries atoms of p character are localized to a small region of space which is immersed in a larger region that is filled with atoms of s character. Energy transfer due …

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Ecosystem Structure And Function In Two Branches Of An Eastern Minnesota, Usa, Trout Stream, Daniel J. Hornbach, Mark Hove, Maya Agata, Ellen Albright, Emily Cavazos, Clara Friedman, Katja Jay, Emily Johnson, Kari Johnson, Anna Staudenmaier Jul 2016

Ecosystem Structure And Function In Two Branches Of An Eastern Minnesota, Usa, Trout Stream, Daniel J. Hornbach, Mark Hove, Maya Agata, Ellen Albright, Emily Cavazos, Clara Friedman, Katja Jay, Emily Johnson, Kari Johnson, Anna Staudenmaier

Faculty Publications

No abstract provided.

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Coral Persistence To Ocean Warming Via Developmental Acclimation, Heather L. Schaneen Jul 2016

Coral Persistence To Ocean Warming Via Developmental Acclimation, Heather L. Schaneen

HCNSO Student Theses and Dissertations

Scleractinian corals are the ‘engineers’ of tropical coral reef ecosystems. Their three-dimensional structure provides habitat for thousands of fish and invertebrate species. The persistence of corals is threatened by climate change. In this study I investigated if corals may be able to increase tolerance to ocean warming through developmental acclimation, i.e. if corals that experience warmer temperatures during embryonic and larval development are better able to cope with higher temperatures later in life. Larvae of the broadcast spawning coral Montastraea cavernosa were raised at ambient (29°C) and future projected ocean warming temperatures (+2°C, 31°C). After larval settlement, coral juveniles from …

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Dango (Doings And Goings On) - Vol. 22 | Issue 11, Haley Stien, Cecily Towell, Aric Tate, Matthew Kimball, Rusty Towell, Vicente Rojas, Paul Carstens, Joshua Daniel Martinez, Reuben Byrd, Mike Daugherity Jul 2016

Dango (Doings And Goings On) - Vol. 22 | Issue 11, Haley Stien, Cecily Towell, Aric Tate, Matthew Kimball, Rusty Towell, Vicente Rojas, Paul Carstens, Joshua Daniel Martinez, Reuben Byrd, Mike Daugherity

DANGO: Doings and Goings On: Summer Research Newsletter, Department of Engineering and Physics

ACU Department of Engineering and Physics Summer Research Newsletter

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Unfolding Convex Polyhedra Via Radially Monotone Cut Trees, Joseph O'Rourke Jul 2016

Unfolding Convex Polyhedra Via Radially Monotone Cut Trees, Joseph O'Rourke

Computer Science: Faculty Publications

A notion of "radially monotone" cut paths is introduced as an effective choice for finding a non-overlapping edge-unfolding of a convex polyhedron. These paths have the property that the two sides of the cut avoid overlap locally as the cut is infinitesimally opened by the curvature at the vertices along the path. It is shown that a class of planar, triangulated convex domains always have a radially monotone spanning forest, a forest that can be found by an essentially greedy algorithm. This algorithm can be mimicked in 3D and applied to polyhedra inscribed in a sphere. Although the algorithm does …

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Conditions For Super-Adiabatic Droplet Growth After Entrainment Mixing, Fan Yang, Raymond Shaw, Huiwen Xue Jul 2016

Conditions For Super-Adiabatic Droplet Growth After Entrainment Mixing, Fan Yang, Raymond Shaw, Huiwen Xue

Michigan Tech Publications, Part 1

Cloud droplet response to entrainment and mixing between a cloud and its environment is considered, accounting for subsequent droplet growth during adiabatic ascent following a mixing event. The vertical profile for liquid water mixing ratio after a mixing event is derived analytically, allowing the reduction to be predicted from the mixing fraction and from the temperature and humidity for both the cloud and environment. It is derived for the limit of homogeneous mixing. The expression leads to a critical height above the mixing level: at the critical height the cloud droplet radius is the same for both mixed and unmixed …

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Three-Dimensional Geologic Modeling And Groundwater Flow Modeling Above A Co2 Sequestration Test Site, Erin Carlock, Eric W. Peterson, David H. Malone Jul 2016

Three-Dimensional Geologic Modeling And Groundwater Flow Modeling Above A Co2 Sequestration Test Site, Erin Carlock, Eric W. Peterson, David H. Malone

Faculty Publications - Geography, Geology, and the Environment

As temperatures rise and climate change becomes an increasingly important issue, geologic carbon dioxide (CO2) sequestration is a viable solution for reducing greenhouse gas emissions. Subsurface 3-D modeling and groundwater flow modeling were completed as a component of a CO2 sequestration feasibility study in the city of Decatur, Illinois. The Decatur Archer Daniels Midland Company Ethanol Plant (ADM) serves as the injection site for a CO2 sequestration project within a deep saline reservoir. Petrel was successfully used to model the glacial deposits in the area. The 3-D geologic model shows the Peoria Silt, Wedron Formation, and Cahokia Formation at the …

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Color Image Segmentation Using The Bee Algorithm In The Markovian Framework, Vehbi Dragaj Jul 2016

Color Image Segmentation Using The Bee Algorithm In The Markovian Framework, Vehbi Dragaj

Master of Science in Computer Science Theses

This thesis presents color image segmentation as a vital step of image analysis in computer vision. A survey of the Markov Random Field (MRF) with four different implementation methods for its parameter estimation is provided. In addition, a survey of swarm intelligence and a number of swarm based algorithms are presented. The MRF model is used for color image segmentation in the framework. This thesis introduces a new image segmentation implementation that uses the bee algorithm as an optimization tool in the Markovian framework. The experiments show that the new proposed method performs faster than the existing implementation methods with …

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Elevation Data And Mapping Updates, Doug Marcy Jul 2016

Elevation Data And Mapping Updates, Doug Marcy

July 29, 2016: The Latest in Sea Level Rise Science

No abstract provided.

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Street Level Predictive Modeling Of Nuisance Flooding In Norfolk, Va, Jon Derek Loftis, Harry V. Wang, David R. Forrest, William 'Skip' A. Stiles Jul 2016

Street Level Predictive Modeling Of Nuisance Flooding In Norfolk, Va, Jon Derek Loftis, Harry V. Wang, David R. Forrest, William 'Skip' A. Stiles

July 29, 2016: The Latest in Sea Level Rise Science

No abstract provided.

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Noaa Inundation Dashboard, Audra Luscher, Paul Fanelli Jul 2016

Noaa Inundation Dashboard, Audra Luscher, Paul Fanelli

July 29, 2016: The Latest in Sea Level Rise Science

No abstract provided.

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The Science Of Sea Level Rise And The Impact Of The Gulf Stream, Tal Ezer Jul 2016

The Science Of Sea Level Rise And The Impact Of The Gulf Stream, Tal Ezer

July 29, 2016: The Latest in Sea Level Rise Science

No abstract provided.

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Risk Of Extreme Events, Don Resio Jul 2016

Risk Of Extreme Events, Don Resio

July 29, 2016: The Latest in Sea Level Rise Science

No abstract provided.

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Subsidence Monitoring In Hampton Roads Using Satellites, Ben Hamlington Jul 2016

Subsidence Monitoring In Hampton Roads Using Satellites, Ben Hamlington

July 29, 2016: The Latest in Sea Level Rise Science

No abstract provided.

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Agenda, Hr Adaptation Forum Jul 2016

Agenda, Hr Adaptation Forum

July 29, 2016: The Latest in Sea Level Rise Science

No abstract provided.

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Total Water Level And Wave Run Up Forecast, Eric Seymour Jul 2016

Total Water Level And Wave Run Up Forecast, Eric Seymour

July 29, 2016: The Latest in Sea Level Rise Science

No abstract provided.

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Use Of Clustering Techniques For Protein Domain Analysis, Eric Rodene Jul 2016

Use Of Clustering Techniques For Protein Domain Analysis, Eric Rodene

School of Computing: Dissertations, Theses, and Student Research

Next-generation sequencing has allowed many new protein sequences to be identified. However, this expansion of sequence data limits the ability to determine the structure and function of most of these newly-identified proteins. Inferring the function and relationships between proteins is possible with traditional alignment-based phylogeny. However, this requires at least one shared subsequence. Without such a subsequence, no meaningful alignments between the protein sequences are possible. The entire protein set (or proteome) of an organism contains many unrelated proteins. At this level, the necessary similarity does not occur. Therefore, an alternative method of understanding relationships within diverse sets of proteins …

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Measuring A Transmon Qubit In Circuit Qed: Dressed Squeezed States, Mostafa Khezri, Eric Mlinar, Justin Dressel, A. N. Korotkov Jul 2016

Measuring A Transmon Qubit In Circuit Qed: Dressed Squeezed States, Mostafa Khezri, Eric Mlinar, Justin Dressel, A. N. Korotkov

Mathematics, Physics, and Computer Science Faculty Articles and Research

Using circuit QED, we consider the measurement of a superconducting transmon qubit via a coupled microwave resonator. For ideally dispersive coupling, ringing up the resonator produces coherent states with frequencies matched to transmon energy states. Realistic coupling is not ideally dispersive, however, so transmon-resonator energy levels hybridize into joint eigenstate ladders of the Jaynes–Cummings type. Previous work has shown that ringing up the resonator approximately respects this ladder structure to produce a coherent state in the eigenbasis (a dressed coherent state). We numerically investigate the validity of this coherent-state approximation to find two primary deviations. First, resonator ring-up leaks small …

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Temporal And Spatial Distribution Of Cetacean Strandings Focusing On The Bottlenose Dolphin (Tursiops Truncatus) With A Synthesis Of Potential Causes, April D. Clark Jul 2016

Temporal And Spatial Distribution Of Cetacean Strandings Focusing On The Bottlenose Dolphin (Tursiops Truncatus) With A Synthesis Of Potential Causes, April D. Clark

HCNSO Student Capstones

A comprehensive review of the literature and a quantitative statistical analysis of that information are presented. A total of 6,015 cetaceans stranded at 36 locations from 24 peer reviewed articles published between 1999 and 2014 are documented, with the two most common stranding locations being the Canary Islands - accounting for 49 of the total cetacean stranding events - and Cape Cod - accounting for 31 of total cetacean stranding events. The documented cetacean stranding events included 805 for bottlenose dolphins (Tursiops truncatus) at a total of ten locations from 11 peer reviewed articles. When all single stranding …

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Essays On Efficiency, Fairness And Strategy-Proofness In Allocation Problems With Exact Capacity Constraints., T. C. A. Madhav Raghavan Dr. Jul 2016

Essays On Efficiency, Fairness And Strategy-Proofness In Allocation Problems With Exact Capacity Constraints., T. C. A. Madhav Raghavan Dr.

Doctoral Theses

In this thesis we consider situations where heterogenous objects are to be distributed among a set of claimants. The objects in question are indivisible, so they cannot be split or shared. There is no money in this economy, so objects cannot be simply bought and sold. Allocations to claimants must be based on their preferences over objects alone. We impose the additional restriction that each object has an exact capacity constraint, such that each object is assigned either to a pre-specified (and fixed) number of agents, or it is not assigned at all. Further, we assume that the capacity constraint …

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Intramolecular 1,5-C(Sp3)–H Radical Amination Via Co(Ii)-Based Metalloradical Catalysis For Five-Membered Cyclic Sulfamides, Hongjian Lu, Kai Lang, Huiling Jiang, Lukasz Wojtas, X Peter Zhang Jul 2016

Intramolecular 1,5-C(Sp3)–H Radical Amination Via Co(Ii)-Based Metalloradical Catalysis For Five-Membered Cyclic Sulfamides, Hongjian Lu, Kai Lang, Huiling Jiang, Lukasz Wojtas, X Peter Zhang

Chemistry Faculty Publications

Co(II)-based metalloradical catalysis (MRC) proves effective for intramolecular 1,5-C–H amination of sulfamoyl azides under neutral and nonoxidative conditions, providing a straightforward approach to access strained 5-membered cyclic sulfamides with nitrogen gas as the only byproduct. The metalloradical amination system is applicable to different types of C(sp3)–H bonds and has a high degree of functional group tolerance. Additional features of the Co(II)-catalyzed 1,5-C–H amination include excellent chemoselectivity toward allylic and propargylic C–H bonds. The unique reactivity and selectivity profile of the Co(II)-catalyzed 1,5-C–H amination is attributed to the underlying radical mechanism of MRC.

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Multiple New-Particle Growth Pathways Observed At The Us Doe Southern Great Plains Field Site, Anna L. Hodshire, Michael J. Lawler, Jun Zhao, John Ortega, Coty Jen, Taina Yli-Juuti, Jared F. Brewer, Jack K. Kodros, Kelley C. Barsanti, Dave R. Hanson, Peter H. Mcmurry, James N. Smith, Jeffery R. Pierce Jul 2016

Multiple New-Particle Growth Pathways Observed At The Us Doe Southern Great Plains Field Site, Anna L. Hodshire, Michael J. Lawler, Jun Zhao, John Ortega, Coty Jen, Taina Yli-Juuti, Jared F. Brewer, Jack K. Kodros, Kelley C. Barsanti, Dave R. Hanson, Peter H. Mcmurry, James N. Smith, Jeffery R. Pierce

Civil and Environmental Engineering Faculty Publications and Presentations

New-particle formation (NPF) is a significant source of aerosol particles into the atmosphere. However, these particles are initially too small to have climatic importance and must grow, primarily through net uptake of low volatility species, from diameters ∼ 1 to 30–100 nm in order to potentially impact climate. There are currently uncertainties in the physical and chemical processes associated with the growth of these freshly formed particles that lead to uncertainties in aerosol-climate modeling. Four main pathways for new-particle growth have been identified: condensation of sulfuric-acid vapor (and associated bases when available), condensation of organic vapors, uptake of organic acids …

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