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Articles 147931 - 147960 of 302771

Full-Text Articles in Physical Sciences and Mathematics

Effects Of Crab Cavities Multipole Content In An Electron-Ion Collider, A. Castilla, V. S. Morozov, T. Satogata, J. R. Delayen Jan 2015

Effects Of Crab Cavities Multipole Content In An Electron-Ion Collider, A. Castilla, V. S. Morozov, T. Satogata, J. R. Delayen

Physics Faculty Publications

The impact on the beam dynamics of the Medium Energy Electron-Ion Colider (MEIC) due to the multipole content of the 750 MHz crab cavity was studied using thin multipole elements for 6D phase space particle tracking in ELEGANT. Target values of the sextupole component for the cavity’s field expansion were used to perform preliminary studies on the proton beam stability when compared to the case of pure dipole content of the rf kicks. Finally, important effects on the beam sizes due to non-linear components of the crab cavities’ fields were identified and some criteria for their future study were proposed.

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High-Performance Simulations Of Coherent Synchrotron Radiation On Multicore Gpu And Cpu Platforms, B. Terzić, A. Godunov, K. Arumugam, D. Ranjan, M. Zubair Jan 2015

High-Performance Simulations Of Coherent Synchrotron Radiation On Multicore Gpu And Cpu Platforms, B. Terzić, A. Godunov, K. Arumugam, D. Ranjan, M. Zubair

Physics Faculty Publications

Coherent synchrotron radiation (CSR) is an effect of self-interaction of an electron bunch as it traverses a curved path. It can cause a significant emittance degradation and microbunching. We present a new high-performance 2D, particle-in-cell code which uses massively parallel multicore GPU/GPU platforms to alleviate computational bottlenecks. The code formulates the CSR problem from first principles by using the retarded scalar and vector potentials to compute the self-interaction fields. The speedup due to the parallel implementation on GPU/CPU platforms exceeds three orders of magnitude, thereby bringing a previously intractable problem within reach. The accuracy of the code is verified against …

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Modeling Crabbing Dynamics In An Electron-Ion Collider, A. Castilla, V. S. Morozov, T. Satogata, J. R. Delayen Jan 2015

Modeling Crabbing Dynamics In An Electron-Ion Collider, A. Castilla, V. S. Morozov, T. Satogata, J. R. Delayen

Physics Faculty Publications

A local crabbing scheme requires π/2 (mod π) horizontal betatron phase advances from an interaction point (IP) to the crab cavities on each side of it. However, realistic phase advances generated by sets of quadrupoles, or Final Focusing Blocks (FFB), between the crab cavities located in the expanded beam regions and the IP differ slightly from π/2. To understand the effect of crabbing on the beam dynamics in this case, a simple model of the optics of the Medium Energy Electron-Ion Collider (MEIC) including local crabbing was developed using linear matrices and then studied numerically over multiple turns (1000 passes) …

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Transverse Momentum Dependent (Tmd) Parton Distribution Functions: Status And Prospects, R. Angeles-Martinez, A. Bacchetta, I. I. Balitsky, D. Boer, M. Boglione, R. Boussarie, F. A. Ceccopieri, I. O. Cherednikov, P. Connor, M. G. Echevarria, G. Ferrera, J. Grados Luyando, F. Hautmann, H. Jung, T. Kasemets, K. Kutak, J. P. Lansberg, A. Lelek, G. Lykasov, J. D. Madrigal Martinez, P. J. Mulders, E. R. Nocera, E. Petreska, C. Pisano, R. Plaċakyte, V. Radescu, M. Radici, G. Schnell, I. Scimemi, A. Signori, L. Szymanowski, S. Taheri Monfared, F.F. Van Der Veken, H. J. Van Haevermaet, P. Van Mechelen, A. A. Vladimirov, S. Wallon Jan 2015

Transverse Momentum Dependent (Tmd) Parton Distribution Functions: Status And Prospects, R. Angeles-Martinez, A. Bacchetta, I. I. Balitsky, D. Boer, M. Boglione, R. Boussarie, F. A. Ceccopieri, I. O. Cherednikov, P. Connor, M. G. Echevarria, G. Ferrera, J. Grados Luyando, F. Hautmann, H. Jung, T. Kasemets, K. Kutak, J. P. Lansberg, A. Lelek, G. Lykasov, J. D. Madrigal Martinez, P. J. Mulders, E. R. Nocera, E. Petreska, C. Pisano, R. Plaċakyte, V. Radescu, M. Radici, G. Schnell, I. Scimemi, A. Signori, L. Szymanowski, S. Taheri Monfared, F.F. Van Der Veken, H. J. Van Haevermaet, P. Van Mechelen, A. A. Vladimirov, S. Wallon

Physics Faculty Publications

We review transverse momentum dependent (TMD) parton distribution functions, their application to topical issues in high-energy physics phenomenology, and their theoretical connections with QCD resummation, evolution and factorization theorems. We illustrate the use of TMDs via examples of multi-scale problems in hadronic collisions. These include transverse momentum qT spectra of Higgs and vector bosons for low qT, and azimuthal correlations in the production of multiple jets associated with heavy bosons at large jet masses. We discuss computational tools for TMDs, and present the application of a new tool, TMDLIB, to parton density fits and parameterizations.

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Resonant 𝜋⁺𝜸 → 𝜋⁺𝜋⁰ Amplitude From Quantum Chromodynamics, Raúl A. Briceño, Jozef J. Dudek, Robert G. Edwards, Christian J. Shultz, Christopher E. Thomas, David J. Wilson Jan 2015

Resonant 𝜋⁺𝜸 → 𝜋⁺𝜋⁰ Amplitude From Quantum Chromodynamics, Raúl A. Briceño, Jozef J. Dudek, Robert G. Edwards, Christian J. Shultz, Christopher E. Thomas, David J. Wilson

Physics Faculty Publications

We present the first ab initio calculation of a radiative transition of a hadronic resonance within quantum chromodynamics (QCD). We compute the amplitude for 𝜋𝜋→𝜋𝜸⋆, as a function of the energy of the 𝜋𝜋 pair and the virtuality of the photon, in the kinematic regime where 𝜋𝜋 couples strongly to the unstable ρ resonance. This exploratory calculation is performed using a lattice discretization of QCD with quark masses corresponding to mπ ≈ 400  MeV. We obtain a description of the energy dependence of the transition amplitude, constrained at 48 kinematic points, that we can analytically continue …

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Development Of Srf Cavity Tuners For Cern, K. Artoos, R. Calaga, O. Capatina, T. Capelli, F. Carra, L. Dassa, N. Kuder, R. Leuxe, P. Minginette, W. Venturini Delsolaro, G. Villiger, C. Zanoni, P. Zhang, S. Verdu-Andrés, B. Xiao, G. Burt, J. Delayen, Hyekyoung Park, T. Jones, N. Templeton Jan 2015

Development Of Srf Cavity Tuners For Cern, K. Artoos, R. Calaga, O. Capatina, T. Capelli, F. Carra, L. Dassa, N. Kuder, R. Leuxe, P. Minginette, W. Venturini Delsolaro, G. Villiger, C. Zanoni, P. Zhang, S. Verdu-Andrés, B. Xiao, G. Burt, J. Delayen, Hyekyoung Park, T. Jones, N. Templeton

Physics Faculty Publications

Superconducting RF cavity developments are currently on-going for new accelerator projects at CERN such as HIE ISOLDE and HL-LHC. Mechanical RF tuning systems are required to compensate cavity frequency shifts of the cavities due to temperature, mechanical, pressure and RF effects on the cavity geometry. A rich history and experience is available for such mechanical tuners developed for existing RF cavities. Design constraints in the context of HIE ISOLDE and HL-LHC such as required resolution, space limitation, reliability and maintainability have led to new concepts in the tuning mechanisms. This paper will discuss such new approaches, their performances and planned …

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Control Of Synchrotron Radiation Effects During Recirculation With Bunch Compression, D. R. Douglas, S. V. Benson, R. Li, Y. Roblin, C. D. Tennant, Geoffrey A. Krafft, Balŝa Terzić, C. -Y. Tsai Jan 2015

Control Of Synchrotron Radiation Effects During Recirculation With Bunch Compression, D. R. Douglas, S. V. Benson, R. Li, Y. Roblin, C. D. Tennant, Geoffrey A. Krafft, Balŝa Terzić, C. -Y. Tsai

Physics Faculty Publications

Studies of beam quality preservation during recirculation * have been extended to generate a design of a compact arc providing bunch compression with positive momentum compaction ** and control of both incoherent and coherent synchrotron radiation (ISR and CSR) effects using the optics balance methods of diMitri et al.***. In addition, the arc/compressor generates very little micro-bunching gain. We detail the beam dynamical basis for the design, discuss the design process, give an example solution, and provide simulations of ISR and CSR effects. Reference will be made to a complete analysis of micro-bunching effects ****.

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Anisotropy Reversal Of The Upper Critical Field At Low Temperatures And Spin-Locked Superconductivity In K₂Cr₃As₃, F. F. Balakirev, T. Kong, M. Jaime, R. D. Mcdonald, C. H. Mielke, A. Gurevich, P. C. Canfield, S. L. Bud'ko Jan 2015

Anisotropy Reversal Of The Upper Critical Field At Low Temperatures And Spin-Locked Superconductivity In K₂Cr₃As₃, F. F. Balakirev, T. Kong, M. Jaime, R. D. Mcdonald, C. H. Mielke, A. Gurevich, P. C. Canfield, S. L. Bud'ko

Physics Faculty Publications

We report measurements of the anisotropic upper critical field Hc2(T) for K2Cr3As3 single crystals up to 60 T and T > 0.6K. Our results show that the upper critical field parallel to the Cr chains, H∥c2(T), exhibits a paramagnetically limited behavior, whereas the shape of the H⊥c2(T) curve (perpendicular to the Cr chains) has no evidence of paramagnetic effects. As a result, the curves H⊥c2(T) and H∥c2(T) cross at T ≈ 4K, so that the anisotropy parameter H(T)=H …

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Energy-Sharing (E,2e) Collisions: Ionization Of The Inert Gases In The Perpendicular Plane, F. K. Miller, H. R. J. Walters, Colm T. Whelan Jan 2015

Energy-Sharing (E,2e) Collisions: Ionization Of The Inert Gases In The Perpendicular Plane, F. K. Miller, H. R. J. Walters, Colm T. Whelan

Physics Faculty Publications

The triple differential cross section for ionization of the inert gases He, Ne, Ar, Kr, and Xe in energy-sharing perpendicular plane geometry is investigated. Encouraging agreement with recent experiments is found using the distorted-wave Born approximation (DWBA). Mechanisms are discussed which explain the He and Ne data but which seem to be masked by the greater distortion effects in the heavier targets. The inclusion of postcollisional interaction is explored using Gamow, Nee, and Ward-Macek, Mee, factors. While both help to improve the shape of the cross section for He and Ne at the lower energies, they …

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Comparative Analysis Of Various Continuous-Time Deterministic Models Of Tumor-Immune Interactions, Robert Paul Childress Jan 2015

Comparative Analysis Of Various Continuous-Time Deterministic Models Of Tumor-Immune Interactions, Robert Paul Childress

Mathematics Theses

Cancer is historically a leading cause of death in the United States. In 2013,cancer was the second leading cause of death with 584,881 deaths \cite{CDC}.Having solely been responsible for 22.5\% of all deaths in 2013 alone \cite{CDC},obtaining as complete an understanding as possible of cancer is obviously necessitated.I investigate deterministic ordinary differential equation models of increasingcomplexity simulating avascular tumor growth and interactions with the innate immuneresponse. After first establishing a baseline of tumor growth limited only by theavailability of local nutrients, I compare the effects on said growth of the nativeimmune system response, chemotherapy, immunotherapy, and various combinations ofthe aforementioned …

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Precision Higgs Coupling Measurements In H→Ww*→Lνlν Final State With The Atlas Detector At The Lhc, Hee Yeun Kim Jan 2015

Precision Higgs Coupling Measurements In H→Ww*→Lνlν Final State With The Atlas Detector At The Lhc, Hee Yeun Kim

Physics Dissertations

The Standard Model (SM) is a gauge theory that describes the fundamental particles of matter and the forces between these particles. It has been tested to a very high precision in the past several decades, except for observation of the Higgs particle, a ramification of the Higgs mechanism. After discovery of the Higgs particle in July 2012, at the Large Hadron Collider (LHC) at the European organization for Nuclear Research (CERN), subsequent studies have focused on confirming whether the newly discovered particle is consistent with the SM Higgs. In particular its spin and its couplings have been measured. In this …

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A Density Functional Theory Guide To High Quality Modification Of Mixed Metal Oxides Used For Photocatalytic Water Splitting, Cedric Leon Mayfield Jan 2015

A Density Functional Theory Guide To High Quality Modification Of Mixed Metal Oxides Used For Photocatalytic Water Splitting, Cedric Leon Mayfield

Physics Dissertations

Phase stability and charge transport of pristine and transition metal alloyed bismuth titanate (Bi2Ti2O7, a.k.a. BTO), a photocatalytic water splitter, has been studied using the generalized gradient approximated density functional theory (GGA-DFT). The primary goals of this work were to predict the effective conditions for pure phase synthesis of the modified ternary multi-metal oxide and to determine the most suitable modifications for enhancing its photocatalytic properties. To understand the details of phase stability and photoconduction, we have derived the formation enthalpies, defect formation energies, electronic structures, spectral absorptions and polaron activation energies for pristine and transition metal doped bismuth titanate …

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Investigations On The Impact Of Spatial Ability And Scientific Reasoning Of Student Comprehension In Physics, State Assessment Test, And Stem Courses, Alfonso Juan Hinojosa Jan 2015

Investigations On The Impact Of Spatial Ability And Scientific Reasoning Of Student Comprehension In Physics, State Assessment Test, And Stem Courses, Alfonso Juan Hinojosa

Physics Dissertations

Physics examines topics that are highly spatial in nature. Students are required to visualize a system, manipulate that system, and then solve a given problem. Doing all of this simultaneously can lead to a cognitive overload, causing the student to be unable to correctly solve the problem. Some difficulties may be rooted in conceptual difficulties, whereas other difficulties may arise from issues with spatial intelligence and visual cognition. In some cases, students might have created an incorrect mental image of the problem to begin with, and it's this misconception, not the lack of content knowledge, that has caused the student …

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First Principles Study Of Ga-Stabilized Δ-Pu Bulk And Surfaces, Sarah Christine Hernandez Jan 2015

First Principles Study Of Ga-Stabilized Δ-Pu Bulk And Surfaces, Sarah Christine Hernandez

Physics Dissertations

Plutonium (Pu) metal is highly reactive toward environmental gases and corrodes at a high rate. Due to this inevitable process, containers used to store Pu-based materials may experience catastrophic failure, subsequently releasing Pu particulates into the environment. Such interactions can be probed at the atomic scale using ab initio methods such as density functional theory (DFT). However, previous theoretical studies only examined these reactions with a pure δ-Pu surface. This is not realistic since δ-Pu exists at a high temperature (600K), therefore most technological applications of δ-Pu employ the alloyed form. The alloyed form is achieved with the addition of …

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Investigation Of Kev Beta Particle Transportation In Matter, Bright Chukwudi Izudike Jan 2015

Investigation Of Kev Beta Particle Transportation In Matter, Bright Chukwudi Izudike

Physics Theses

Nuclear imaging is widely used in medicine for more accurate diagnoses and more effective treatment for cancer. Current emission tomography techniques used in clinics may not efficiently detect cancer at a very early stage partly because of the weak signals from small tumors. Portable nuclear imaging devices can more effectively reveal these small tumors in a close proximity for complete malignant tissue destruction. With the advance of detector technology in high energy physics, the detection of beta particles (positron and electron) from clinical/pre-clinical radiotracers, such as those labeled with Cu-64, may open a new avenue for imageguided treatment of cancer. …

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Analysis Of Equatorial F-Region Vertical Neutral Winds From Brazil Fpi Observations, Jose De La Garza Jan 2015

Analysis Of Equatorial F-Region Vertical Neutral Winds From Brazil Fpi Observations, Jose De La Garza

Physics Theses

Understanding the neutral dynamics of our upper atmosphere is an essential component of space weather prediction. In order to come up with better climatological models that describe upper atmospheric variations, an accurate description of vertical neutral winds is needed. Hence, observations of thermospheric winds must be continually made in order to fulfill this need. Vertical winds are generally smaller than horizontal winds, but even small vertical winds can have a significant effect on the ionosphere and thermosphere because of the large vertical density gradients that exist throughout the atmosphere. Recent observation deployments of Fabry-Perot Interferometers (FPIs) in Brazil have allowed …

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Searching For Dark Matter In Neutrino Beams, Crystal Nicole Chumani Red Eagle Jan 2015

Searching For Dark Matter In Neutrino Beams, Crystal Nicole Chumani Red Eagle

Physics Theses

Dark Matter detection is currently a major area of interest for research. For the past 45 years many ideas and experiments have been investigated to explain the existence of and to detect Dark Matter. Since these experiments have yet to yield any wholly affirmative results it may be time to look for other ways to detect Dark Matter. This particular study looks at the possibilities for Dark Matter detection in neutrino beams at the Deep Underground Neutrino Experiment (DUNE). Simulations for specific parameters were run using MadGraph5 and the results for those data runs are presented and discussed. Areas of …

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Laser-Assisted Transfection, Optogenetic Stimulation And Its Detection In Mammalian Cells, Kamal Raj Dhakal Jan 2015

Laser-Assisted Transfection, Optogenetic Stimulation And Its Detection In Mammalian Cells, Kamal Raj Dhakal

Physics Dissertations

Stimulation of cells, especially neurons is of significant interest both for basic understanding of neuronal circuitry as well as clinical intervention. Existing electrode-based methods of stimulation is invasive and non-specific to single cells or cell type. Recently, optical stimulation of targeted neurons expressing light-sensitive proteins (opsins) has surfaced as an emerging and a powerful technique (Optogenetics) in neuroscience. Various transfection methods such as viral-based, lipofection, electroporation have been developed to express the opsin. However, these methods are not suitable for transfection of a single cell. In order to achieve single cell transfection, we have used femtosecond pulsed laser microbeam to …

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Search For A Supersymmetric Partner To The Top Quark Using A Multivariate Analysis Technique., Smita Darmora Jan 2015

Search For A Supersymmetric Partner To The Top Quark Using A Multivariate Analysis Technique., Smita Darmora

Physics Dissertations

Supersymmetry (SUSY) is an extension to the Standard Model (SM) which introduces supersymmetric partners of the known fermions and bosons. Top squark (stop) searches are a natural extension of inclusive SUSY searches at the LHC. If SUSY solves the naturalness problem, the stop should be light enough to cancel the top loop contribution to the Higgs mass parameter. The 3rd generation squarks may be the first SUSY particles to be discovered at the LHC. The stop can decay into a variety of final states, depending, amongst other factors, on the hierarchy of the mass eigenstates formed from the linear superposition …

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Business Reputation Of Social Networks Of Web Services, Zakaria Maamar, Gianpiero Costantino, Marinella Petrocchi, Fabio Martinelli Jan 2015

Business Reputation Of Social Networks Of Web Services, Zakaria Maamar, Gianpiero Costantino, Marinella Petrocchi, Fabio Martinelli

All Works

© 2015 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license. This paper introduces a set of criteria that are used to establish the reputation of a social network from a business perspective. This network is populated with social Web services. Compared to regular Web services, social Web services establish and maintain networks of contacts, count on their (privileged) contacts when needed, etc. These criteria are membershipCost, demandLevel, satisfactionLevel, and retentionLevel, and assist a social Web service in selecting the best social network in which it will sign up. Similar criteria have …

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Weaving Risk Identification Into Crowdsourcing Lifecycle, Faouzi Kamoun, Dima Alhadidi, Zakaria Maamar Jan 2015

Weaving Risk Identification Into Crowdsourcing Lifecycle, Faouzi Kamoun, Dima Alhadidi, Zakaria Maamar

All Works

© 2015 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license. Crowdsourcing enables companies and individuals as well to tap into the versatile knowledge, creativity, and talent of a large population of crowd contributors. Yet, crowdsourcing can expose companies to a myriad of risks that can have drastic impact on the profitability and competitive position. This paper presents a Risk Breakdown Structure (RBS) of crowdsourcing projects that spans the entire project's lifecycle. The paper first reports on a lifecycle model that captures the main phases of a crowdsourcing project. It then identifies …

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A Service Oriented Broker-Based Approach For Dynamic Resource Discovery In Virtual Networks, Sleiman Rabah, May El Barachi, Nadjia Kara, Rachida Dssouli, Joey Paquet Jan 2015

A Service Oriented Broker-Based Approach For Dynamic Resource Discovery In Virtual Networks, Sleiman Rabah, May El Barachi, Nadjia Kara, Rachida Dssouli, Joey Paquet

All Works

© 2015, Rabah et al.; licensee Springer. In the past few years, the concept of network virtualization has received significant attention from industry and research fora. This concept applies virtualization to networking infrastructures by enabling the dynamic creation of several co-existing logical network instances (or virtual networks) over a shared physical network infrastructure (or substrate network). Due to the potential it offers in terms of diversifying existing networks and ensuring the co-existence of heterogeneous network architectures on top of shared substrates, network virtualization is often considered as an enabler of a polymorphic Internet and a cornerstone of the future Internet …

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E-Mail Authorship Attribution Using Customized Associative Classification, Michael R. Schmid, Farkhund Iqbal, Benjamin C.M. Fung Jan 2015

E-Mail Authorship Attribution Using Customized Associative Classification, Michael R. Schmid, Farkhund Iqbal, Benjamin C.M. Fung

All Works

E-mail communication is often abused for conducting social engineering attacks including spamming, phishing, identity theft and for distributing malware. This is largely attributed to the problem of anonymity inherent in the standard electronic mail protocol. In the literature, authorship attribution is studied as a text categorization problem where the writing styles of individuals are modeled based on their previously written sample documents. The developed model is employed to identify the most plausible writer of the text. Unfortunately, most existing studies focus solely on improving predictive accuracy and not on the inherent value of the evidence collected. In this study, we …

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Factors Influencing Digital Forensic Investigations: Empirical Evaluation Of 12 Years Of Dubai Police Cases, Ibtesam Alawadhi, Janet Read, Andrew Marrington, Virginia Franqueira Jan 2015

Factors Influencing Digital Forensic Investigations: Empirical Evaluation Of 12 Years Of Dubai Police Cases, Ibtesam Alawadhi, Janet Read, Andrew Marrington, Virginia Franqueira

All Works

In Digital Forensics, the number of person-hours spent on investigation is a key factor which needs to be kept to a minimum whilst also paying close attention to the authenticity of the evidence. The literature describes challenges behind increasing person-hours and identifies several factors which contribute to this phenomenon. This paper reviews these factors and demonstrates that they do not wholly account for increases in investigation time. Using real case records from the Dubai Police, an extensive study explains the contribution of other factors to the increase in person-hours. We conclude this work by emphasizing on several factors affecting the …

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Graph-Theoretic Characterization Of Cyber-Threat Infrastructures, Amine Boukhtouta, Djedjiga Mouheb, Mourad Debbabi, Omar Alfandi, Farkhund Iqbal, May El Barachi Jan 2015

Graph-Theoretic Characterization Of Cyber-Threat Infrastructures, Amine Boukhtouta, Djedjiga Mouheb, Mourad Debbabi, Omar Alfandi, Farkhund Iqbal, May El Barachi

All Works

In this paper, we investigate cyber-threats and the underlying infrastructures. More precisely, we detect and analyze cyber-threat infrastructures for the purpose of unveiling key players (owners, domains, IPs, organizations, malware families, etc.) and the relationships between these players. To this end, we propose metrics to measure the badness of different infrastructure elements using graph theoretic concepts such as centrality concepts and Google PageRank. In addition, we quantify the sharing of infrastructure elements among different malware samples and families to unveil potential groups that are behind specific attacks. Moreover, we study the evolution of cyber-threat infrastructures over time to infer patterns …

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Network And Device Forensic Analysis Of Android Social-Messaging Applications, Daniel Walnycky, Ibrahim Baggili, Andrew Marrington, Jason Moore, Frank Breitinger Jan 2015

Network And Device Forensic Analysis Of Android Social-Messaging Applications, Daniel Walnycky, Ibrahim Baggili, Andrew Marrington, Jason Moore, Frank Breitinger

All Works

In this research we forensically acquire and analyze the device-stored data and network traffic of 20 popular instant messaging applications for Android. We were able to reconstruct some or the entire message content from 16 of the 20 applications tested, which reflects poorly on the security and privacy measures employed by these applications but may be construed positively for evidence collection purposes by digital forensic practitioners. This work shows which features of these instant messaging applications leave evidentiary traces allowing for suspect data to be reconstructed or partially reconstructed, and whether network forensics or device forensics permits the reconstruction of …

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Effects Of Prescribed Fire On Upland Plant Biodiversity And Abundance In Northeast Florida, Peter D. Maholland Jan 2015

Effects Of Prescribed Fire On Upland Plant Biodiversity And Abundance In Northeast Florida, Peter D. Maholland

UNF Graduate Theses and Dissertations

Terrestrial ecosystems in the southeastern United States have evolved with fire as a common disturbance and as a result many natural communities require the presence of fire to persist over time. Human development precludes natural fires from occurring within these communities; however, prescribed fire is considered to be a critical tool in the effort to restore fire-dependent ecosystems after decades of fire exclusion. Direct effects of fire on individual floral and faunal species as well as benefits to biodiversity at the landscape (gamma diversity) level have largely been supported in previous research. However, information on the effects of natural and …

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Understanding The Physiological Effects Of Suspended Material On Rainbow Trout (Oncorhynchus Mykiss), Tyler J. Weinhardt Jan 2015

Understanding The Physiological Effects Of Suspended Material On Rainbow Trout (Oncorhynchus Mykiss), Tyler J. Weinhardt

Theses and Dissertations (Comprehensive)

The effect of global warming on northern environments is becoming increasingly evident. Melting of underlying permafrost is associated with widespread impacts in these environments. The loss of permafrost results in a destabilizing of underlying sedimentary layers resulting in thermokarst slumping. When this occurs on a large scale (mega-slumping) soil material becomes mobilized and is carried into local streams and rivers. The purpose of this study is to examine the sub-lethal physiological effects that suspended material has on rainbow trout (Oncorhynchus mykiss) in the context of the Peel River Plateau. Juvenile rainbow trout were exposed (following Environment Canada exposure …

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Examination Of Field Scale Hydrological Processes Under Three Different Tillage Methods In Southern Ontario: Conventional Till (Ct); Modified Till (Mt); And No Till (Nt), Ian Martin Jan 2015

Examination Of Field Scale Hydrological Processes Under Three Different Tillage Methods In Southern Ontario: Conventional Till (Ct); Modified Till (Mt); And No Till (Nt), Ian Martin

Theses and Dissertations (Comprehensive)

In the wake of the severe algal blooms of 2011 and 2013 in the Great Lakes, international governing bodies such as the United Nations, are advocating for increased studies on nutrient dynamics within agricultural systems. Understanding farm contributions to nutrient loads entering the Great Lakes involves quantifying nutrient export from different tillage practices common in the Great Lakes basin, which include no-till (NT), conventional till (CT) and modified tillage (MT). Understanding differences in nutrient export from different tillage practices may well be related to structural differences in the upper portion of the vadose zone which impact infiltration, soil moisture and …

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The Importance Of Supersaturated Silica Deposition For Base-Metalau-Ag Mineralisation In Western Turkey, Gülcan Bozkaya, David A. Banks Jan 2015

The Importance Of Supersaturated Silica Deposition For Base-Metalau-Ag Mineralisation In Western Turkey, Gülcan Bozkaya, David A. Banks

Turkish Journal of Earth Sciences

In the Arapuçandere LS-IS epithermal deposit in western Turkey, either well crystallised euhedral quartz or milky amorphous silica occurrences are associated with the precious and base-metal mineralisation. This study has determined the relative importance of the processes precipitating both of these in relation to the deposition of the ore. Analysis by LA-ICPMS of euhedral quartz and amorphous silica show that the latter is associated with much higher metal concentrations and suggests that the process responsible is more important for deposition of ore in the deposit. Mineralisation at Kumarlar and Koru may be similar. Slow cooling precipitates euhedral quartz and some …

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