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Full-Text Articles in Physical Sciences and Mathematics

Novel Technique Using Cherenkov Radiation For Nuclear Terrorism Prevention, Matthew Mark Romano Apr 2024

Novel Technique Using Cherenkov Radiation For Nuclear Terrorism Prevention, Matthew Mark Romano

Aerospace, Physics, and Space Science Student Publications

I present a novel approach for detecting rogue nuclear material at country borders, addressing the current lack of reliable and economical mechanisms for this purpose. My proposed methodology utilizes Cherenkov radiation emitted by cosmic muons to reconstruct the particle's trajectory using a single detector. By analyzing the eccentricity of the projected ellipse formed when the Cherenkov cone intersects the detector plane, one can determine the angle a muon makes with the detector. This innovative technique effectively doubles the efficiency of the detection system by halving the number of required detectors while simultaneously increasing the resolution of the measurements taken.

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Implementation Of Python Based High Voltage Tests For Gem Detectors, John Paul Hernandez Apr 2024

Implementation Of Python Based High Voltage Tests For Gem Detectors, John Paul Hernandez

Aerospace, Physics, and Space Science Student Publications

The Compact Muon Solenoid, CMS, and other detectors at LHC are in the process of being upgraded for the HL-LHC (High-Luminosity Large Hadron Collider) which will produce more than 5 times the particle interactions than of the current LHC. One upgrade to CMS is the introduction of new GEM detectors (Gaseous Electron Multiplier), GE2/1 and ME0 shown at right are new detectors to CMS and therefore must be tested thoroughly prior to being installed.

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Modeling An Extra Planet's Effects On Earth, Emily Simpson Apr 2024

Modeling An Extra Planet's Effects On Earth, Emily Simpson

Aerospace, Physics, and Space Science Student Publications

Orbital dynamics play a crucial role in determining the habitability of exoplanets, and many models have been developed to study the dynamical evolution of broader planetary system structure. To further investigate the implications this has regarding planetary habitability, this project simulated the evolution of the Solar System with an additional planet orbiting in place of the Asteroid Belt using the Gravitational Rigid-body InTegrator (GRIT) package. 21 total simulations were run for 100,000 years with varying values for the extra planet’s mass (from 0.01 to 10 Earth masses) and orbital parameters (based on the 4 most massive asteroids in the Asteroid …

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Rescape: Transforming Coral-Reefscape Images For Quantitative Analysis, Zachary Ferris, Eraldo Ribeiro, Tomofumi Nagata, Robert Van Woesik Apr 2024

Rescape: Transforming Coral-Reefscape Images For Quantitative Analysis, Zachary Ferris, Eraldo Ribeiro, Tomofumi Nagata, Robert Van Woesik

Ocean Engineering and Marine Sciences Faculty Publications

Ever since the first image of a coral reef was captured in 1885, people worldwide have been accumulating images of coral reefscapes that document the historic conditions of reefs. However, these innumerable reefscape images suffer from perspective distortion, which reduces the apparent size of distant taxa, rendering the images unusable for quantitative analysis of reef conditions. Here we solve this century-long distortion problem by developing a novel computer-vision algorithm, ReScape, which removes the perspective distortion from reefscape images by transforming them into top-down views, making them usable for quantitative analysis of reef conditions. In doing so, we demonstrate the …

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Climate Adaptation And Risk Preparedness In Florida’S East Coast Cities: Views Of Municipal Leaders, Sheila A. Young, Kenyon C. Lindeman, Samantha R. Fowler Oct 2022

Climate Adaptation And Risk Preparedness In Florida’S East Coast Cities: Views Of Municipal Leaders, Sheila A. Young, Kenyon C. Lindeman, Samantha R. Fowler

Ocean Engineering and Marine Sciences Faculty Publications

Cities along Florida’s Atlantic coastline are particularly vulnerable to the effects of climate change, posing significant challenges for city planners. How cities see themselves in terms of developing or implementing their climate change adaptation action plans depends, in part, on the extent to which they perceive climate-related events as risks, and their city size. Data were obtained from city leaders (i.e. mayors, city/town managers, or their designees) from 86 cities along Florida’s Atlantic Coast from January to May 2021 to quantitatively assess factors influencing city adaptation planning. Validity and reliability were obtained for the survey. Multiple regression analyses showed significant …

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Vibration Control Of Submerged Floating Tunnel In Waves And Earthquakes Through Tuned Mass Damper, Chungkuk Jin, Sung-Jae Kim, Moohyun Kim Sep 2022

Vibration Control Of Submerged Floating Tunnel In Waves And Earthquakes Through Tuned Mass Damper, Chungkuk Jin, Sung-Jae Kim, Moohyun Kim

Ocean Engineering and Marine Sciences Faculty Publications

In this study, a passive Tuned Mass Damper (TMD) is investigated to dampen resonant motions of a Submerged Floating Tunnel (SFT) in waves and earthquakes. TMD is adopted to control resonant lateral motion. A time-domain dynamics simulation model that considers the elasticity of the tunnel and mooring lines is first established, which is based on the lumped mass method and Morison equation, and the SFT-TMD interaction is considered through springs and dampers. Next, by using the Harmony Search (HS) algorithm, TMD's spring and damping coefficients are optimized; the dynamics simulations under white noise seismic excitations are continuously carried out with …

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Dynamic Task Allocation And Understanding Of Situation Awareness Under Different Levels Of Autonomy In Closed-Hatch Military Vehicles Using Virtual Reality, Jessie E. Cossitt Jan 2022

Dynamic Task Allocation And Understanding Of Situation Awareness Under Different Levels Of Autonomy In Closed-Hatch Military Vehicles Using Virtual Reality, Jessie E. Cossitt

Link Foundation Modeling, Simulation and Training Fellowship Reports

The current state of the art in autonomous vehicles is partial autonomy, and to optimize the use of these vehicles, it is essential to understand the interactions between the vehicles and their operators. Partially autonomous vehicles require operators to perform parts of the driving task and to be alert and ready to take over full control of the vehicle at any point. Due to the requirements on the human operator, it is necessary to know how the operators' abilities are impacted by the amount of autonomy present in the system. There are known effects of autonomous systems on performance, cognitive …

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Current Trends In Random Walks On Random Lattices, Jewgeni H. Dshalalow May 2021

Current Trends In Random Walks On Random Lattices, Jewgeni H. Dshalalow

Mathematics and System Engineering Faculty Publications

In a classical random walk model, a walker moves through a deterministic d-dimensional integer lattice in one step at a time, without drifting in any direction. In a more advanced setting, a walker randomly moves over a randomly configured (non equidistant) lattice jumping a random number of steps. In some further variants, there is a limited access walker’s moves. That is, the walker’s movements are not available in real time. Instead, the observations are limited to some random epochs resulting in a delayed information about the real-time position of the walker, its escape time, and location outside a bounded subset …

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System-Level Approaches For Intensifying The Co2 Electrolysis Process: From Reaction Chemistry To Process Development, Saket S. Bhargava Jan 2021

System-Level Approaches For Intensifying The Co2 Electrolysis Process: From Reaction Chemistry To Process Development, Saket S. Bhargava

Link Foundation Energy Fellowship Reports

Electrochemical reduction of CO2 (CO2RR) is a promising alternative for producing carbon-based value-added chemicals such as carbon monoxide, ethylene, and ethanol that are currently produced using thermochemical fossil fuel-based production methods.1 Despite research breakthroughs, significant improvements are still needed in terms of activities (partial current densities – pCDs), selectivities (Faradaic efficiencies – FEs), and full cell energy efficiencies (EEs) before the CO2 electrolysis process can be employed at industrial scales in an economically feasible and carbon-neutral manner.

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The Solar Energetic Particle Event Of 2010 August 14: Connectivity With The Solar Source Inferred From Multiple Spacecraft Observations And Modeling, D. Lario, R.-Y. Kwon, I. G. Richardson, N. E. Raouafi, B. J. Thompson, T. T. Von Rosenvinge, M. L. Mays, P. A. Makela, H. Xie, H. M. Bain, M. Zhang, L. Zhao, H. V. Cane, A. Papaioannou, N. Thakur, P. Riley Mar 2020

The Solar Energetic Particle Event Of 2010 August 14: Connectivity With The Solar Source Inferred From Multiple Spacecraft Observations And Modeling, D. Lario, R.-Y. Kwon, I. G. Richardson, N. E. Raouafi, B. J. Thompson, T. T. Von Rosenvinge, M. L. Mays, P. A. Makela, H. Xie, H. M. Bain, M. Zhang, L. Zhao, H. V. Cane, A. Papaioannou, N. Thakur, P. Riley

Aerospace, Physics, and Space Science Faculty Publications

We analyze one of the first solar energetic particle (SEP) events of solar cycle 24 observed at widely separated spacecraft in order to assess the reliability of models currently used to determine the connectivity between the sources of SEPs at the Sun and spacecraft in the inner heliosphere. This SEP event was observed on 2010 August 14 by near-Earth spacecraft, STEREO-A (∼80° west of Earth) and STEREO-B (∼72° east of Earth). In contrast to near-Earth spacecraft, the footpoints of the nominal magnetic field lines connecting STEREO-A and STEREO-B with the Sun were separated from the region where the parent fast …

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On A Class Of Elliptic Free Boundary Problems With Multiple Solutions, Kanishka Perera Mar 2020

On A Class Of Elliptic Free Boundary Problems With Multiple Solutions, Kanishka Perera

Mathematics and System Engineering Faculty Publications

We prove that a certain class of elliptic free boundary problems, which includes the Prandtl-Batchelor problem from fluid dynamics as a special case, has two distinct nontrivial solutions for large values of a parameter. The first solution is a global minimizer of the energy. The energy functional is nondifferentiable, so standard variational arguments cannot be used directly to obtain a second nontrivial solution. We obtain our second solution as the limit of mountain pass points of a sequence of C1-functionals approximating the energy. We use careful estimates of the corresponding energy levels to show that this limit is neither trivial …

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Investigation Of Coherent Charge Transfer In Transition Metal Dichalcogenide Heterostructures With Multiresonant Coherent Multidimensional Spectroscopy, Darien J. Morrow Jan 2020

Investigation Of Coherent Charge Transfer In Transition Metal Dichalcogenide Heterostructures With Multiresonant Coherent Multidimensional Spectroscopy, Darien J. Morrow

Link Foundation Energy Fellowship Reports

Photovoltaic solar cells convert sunlight into electricity by using material heterojunctions to facilitate separation of photo-excited charges in order to generate a current. Understanding and optimizing the efficiency of charge separation at the quantum mechanical level defines the future of the solar energy landscape and its impact on society. In the past decade, new charge separation mechanisms have been researched in heterostructures of layered 2D materials which facilitate ultrafast charge transfer and separation (see Figure 1a).[1, 2] Theoreticians have studied the mechanism of ultrafast transfer in these 2D materials and predict ultrafast transfer occurs by electrons collectively flowing back-and-forth between …

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Developing High-Capacity Rechargeable Batteries Based On Lithium-Sulfur Chemistry, Yiren Zhong Jan 2020

Developing High-Capacity Rechargeable Batteries Based On Lithium-Sulfur Chemistry, Yiren Zhong

Link Foundation Energy Fellowship Reports

The development of portable and transportation applications, such as the booming electrical vehicles, heavily relies on high-energy battery technologies. As the current Li-ion batteries approach the energy storage limit, the new battery chemistry that promises higher theoretical energy density should be pursued.1 Lithium-sulfur (Li-S) batteries use light-weight lithium as the anode and low-cost sulfur as the cathode and ether-based solution as the electrolyte. With the chemical conversion reaction of 16 Li + S8 ↔ 8 Li2S, Li-S batteries can provide a theoretical specific energy (2600 Wh/kg), 5 times over that of current Li-ion batteries.2, 3 Practical Li-S batteries require a …

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Interactive Ecosystem For Surgical Training In A Realistic Mixed-Reality, Ehsan Azimi Jan 2020

Interactive Ecosystem For Surgical Training In A Realistic Mixed-Reality, Ehsan Azimi

Link Foundation Modeling, Simulation and Training Fellowship Reports

In many surgical procedures, surgeons rely on their general knowledge of anatomy and relatively crude measurements, which have inevitable uncertainties in locating internal anatomical targets. One example procedure that is frequently performed in neurosurgery is ventriculostomy (also called external ventricular drainage), where the surgeon inserts a catheter into the ventricle to drain cerebrospinal fluid (CSF). In this procedure, often performed bedside and therefore without image guidance, the surgeon makes measurements relative to cranial features to determine where to drill into the skull and then attempts to insert a catheter as perpendicular to the skull as possible. Although it is one …

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Transition Metal Perovskite Chalcogenides: Emerging Semiconductors For Visible And Infrared Optoelectronics, Shanyuan Niu Sep 2019

Transition Metal Perovskite Chalcogenides: Emerging Semiconductors For Visible And Infrared Optoelectronics, Shanyuan Niu

Link Foundation Energy Fellowship Reports

Large-scale deployment of electronic, photonic, and energy technologies rely on continuous discovery and invention of high performance electronic materials with earth abundant compositions. Carrier mobility and density of states (DOS) are two critical material parameters in light-matter interaction to enable efficient, high performance light absorption, emission, and detection. While the advantages of high carrier mobility are evident, large density of states can lead to desirable electronic and optical properties such as enhanced light absorption and emission (efficient solar energy conversion and lighting), high carrier density (high current, power density), and large thermopower (thermoelectrics). However, there is an inverse correlation between …

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Learning Meaningful Representations Of Surgical Motion Without Annotations, Robert Dipietro Sep 2019

Learning Meaningful Representations Of Surgical Motion Without Annotations, Robert Dipietro

Link Foundation Modeling, Simulation and Training Fellowship Reports

Superior technical skill in the operating room is associated with better patient outcomes [3,18], and at the core of surgical education is the belief that technical skill is improved through deliberate practice and appropriate feedback [10,17]. However, current standards for providing technical skills training are constrained by time [2], and most available methods for surgical skill assessment are subjective and global [14]. This has motivated interest in delivering targeted and automated assessment and feedback with machines, especially in robot-assisted surgery, during which high-quality surgical motion data can be captured transparently for analysis. Automated surgical activity recognition is an important precursor …

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Paid-To-Save: Using Dynamic Sensors And Cash Transfers To Improve Cookstove Use In Rwanda, Philip (Nick) Turman-Bryant Jan 2019

Paid-To-Save: Using Dynamic Sensors And Cash Transfers To Improve Cookstove Use In Rwanda, Philip (Nick) Turman-Bryant

Link Foundation Energy Fellowship Reports

Increasing frequency and severity of drought is driving increased use of groundwater resources in arid regions of Northern Kenya, where approximately 2.5 million people depend on groundwater for personal use, livestock, and limited irrigation. As part of a broader effort to provide more sustainable water, sanitation, and hygiene services in the region, we have collected data related to site functionality and use for approximately 120 motorized boreholes across five counties. Using a multilevel model to account for geospatial and temporal clustering, we found that borehole sites, which counties had identified as strategic assets during drought, ran on average about 1.31 …

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Some New Nonlinear Second-Order Boundary Value Problems On An Arbitrary Domain, Ahmed Alsaedi, Mona Alsulami, Ravi P. Agarwal, Bashir Ahmad Dec 2018

Some New Nonlinear Second-Order Boundary Value Problems On An Arbitrary Domain, Ahmed Alsaedi, Mona Alsulami, Ravi P. Agarwal, Bashir Ahmad

Mathematics and System Engineering Faculty Publications

In this paper, we develop the existence theory for nonlinear second-order ordinary differential equations equipped with new kinds of nonlocal non-separated type integral multi-point boundary conditions on an arbitrary domain. Existence results are proved with the aid of fixed point theorems due to Schaefer, Krasnoselskii, and Leray–Schauder, while the uniqueness of solutions for the given problem is established by means of contraction mapping principle. Examples are constructed for the illustration of the obtained results. Ulam-stability is also discussed for the given problem. A variant of the problem involving different boundary data is also discussed. Finally, we introduce an associated boundary …

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Competence Assessment And Automated Feedback For Ultrasound-Guided Intervention Training, Matthew Holden Sep 2018

Competence Assessment And Automated Feedback For Ultrasound-Guided Intervention Training, Matthew Holden

Link Foundation Modeling, Simulation and Training Fellowship Reports

There is an ongoing shift in the medical education community from a time-based model of medical education to a competency-based model. In the competency-based model, trainees’ performance must be continually monitored. But due to constraints on expert scheduling, this is infeasible for expert preceptors. Moreover, despite the advent of structured assessment rubrics, expert assessment remains subjective. This motivates the development of automated assessment methods. This can be complemented by methods for automatic feedback and instruction, which can be used to improve the training process and acceleration learning curves without the presence of an expert preceptor. Ultrasound-guided interventions are particularly challenging …

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Measurement Of B Hadron Lifetimes In Pp Collisions At √S = 8 Tev, A. M. Sirunyan, Marc M. Baarmand, Vallary Bhopatkar, Stefano Colafranceschi, Marcus Hohlmann, Daniel Noonan, Tuhin S. Roy, Francisco Yumiceva, The Cms Collaboration Jun 2018

Measurement Of B Hadron Lifetimes In Pp Collisions At √S = 8 Tev, A. M. Sirunyan, Marc M. Baarmand, Vallary Bhopatkar, Stefano Colafranceschi, Marcus Hohlmann, Daniel Noonan, Tuhin S. Roy, Francisco Yumiceva, The Cms Collaboration

Aerospace, Physics, and Space Science Faculty Publications

Measurements are presented of the lifetimes of the B ⁰, Bs0, Λb0, and Bc+ hadrons using the decay channels B0→J/ψK∗(892)0, B0→J/ψKS0, Bs0→J/ψπ+π-, Bs0→J/ψϕ(1020), Λb0→J/ψΛ0, and Bc+→J/ψπ+. The data sample, corresponding to an integrated luminosity of 19.7fb-1, was collected by the CMS detector at the LHC in proton–proton collisions at s=8TeV. The B 0 lifetime is measured to be 453.0±1.6(stat)±1.8(syst)μm in J / ψK ∗(892) 0and 457.8±2.7(stat)±2.8(syst)μm in J/ψKS0, which results in a combined measurement of cτB0=454.1±1.4(stat)±1.7(syst)μm. The effective lifetime of the Bs0 meson is measured in two decay modes, with contributions from different amounts of the heavy and light eigenstates. …

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Effects Of Coronal Magnetic Field Structures On The Transport Of Solar Energetic Particles, Lulu Zhao, Ming Zhang Jun 2018

Effects Of Coronal Magnetic Field Structures On The Transport Of Solar Energetic Particles, Lulu Zhao, Ming Zhang

Aerospace, Physics, and Space Science Faculty Publications

This Letter presents a model calculation of solar energetic particle (SEP) transport to test the sensitivity of the distribution of escaped SEPs in interplanetary space and dependence upon the details of the magnetic field structure in the corona. It is applied to a circumsolar event on 2011 November 3, in which SEPs are observed promptly after the solar event eruption by three spacecraft (the twin Solar TErrestrial RElations Observatories (STEREO-A and STEREO-B) and ACE) separated by more than 100° in longitude from each other. The corona magnetic field reconstructed from photosphseric field measurements using the PFSS method changes substantially before …

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Synthesizing Broadband Propagation-Invariant Space-Time Wave Packets Using Transmissive Phase Plates, H. Esat Kondakci, Murat Yessenov, Monjurul Feeroz Meem, Danielle Reyes, Daniel J. Thui, Shermineh Rostami Fairchild, Martin C. Richardson, Rajesh Menon, Ayman F. Abouraddy May 2018

Synthesizing Broadband Propagation-Invariant Space-Time Wave Packets Using Transmissive Phase Plates, H. Esat Kondakci, Murat Yessenov, Monjurul Feeroz Meem, Danielle Reyes, Daniel J. Thui, Shermineh Rostami Fairchild, Martin C. Richardson, Rajesh Menon, Ayman F. Abouraddy

Aerospace, Physics, and Space Science Faculty Publications

Space-time wave packets are a class of pulsed optical beams that are di raction-free and dispersion-free in free space by virtue of introducing a tight correlation between the spatial and temporal degrees of freedom of the field. Such wave packets have been recently synthesized in a novel configuration that makes use of a spatial light modulator to realize the required spatio-temporal correlations. This arrangement combines pulse-modulation and beam-shaping to assign one spatial frequency to each wavelength according to a prescribed correlation function. Relying on a spatial light modulator results in several limitations by virtue of their pixelation, small area, and …

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Lyapunov Functions To Caputo Fractional Neural Networks With Time-Varying Delays, Ravi P. Agarwal, Snezhana G. Hristova, Donal O'Regan May 2018

Lyapunov Functions To Caputo Fractional Neural Networks With Time-Varying Delays, Ravi P. Agarwal, Snezhana G. Hristova, Donal O'Regan

Mathematics and System Engineering Faculty Publications

One of the main properties of solutions of nonlinear Caputo fractional neural networks is stability and often the direct Lyapunov method is used to study stability properties (usually these Lyapunov functions do not depend on the time variable). In connection with the Lyapunov fractional method we present a brief overview of the most popular fractional order derivatives of Lyapunov functions among Caputo fractional delay differential equations. These derivatives are applied to various types of neural networks with variable coefficients and time-varying delays. We show that quadratic Lyapunov functions and their Caputo fractional derivatives are not applicable in some cases when …

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Keeping Up With Sea-Level Rise: Carbonate Production Rates In Palau And Yap, Western Pacific Ocean, Robert Van Woesik, Christopher William Cacciapaglia May 2018

Keeping Up With Sea-Level Rise: Carbonate Production Rates In Palau And Yap, Western Pacific Ocean, Robert Van Woesik, Christopher William Cacciapaglia

Ocean Engineering and Marine Sciences Faculty Publications

Coral reefs protect islands from tropical storm waves and provide goods and services for millions of islanders worldwide. Yet it is unknown how coral reefs in general, and carbonate production in particular, will respond to sea-level rise and thermal stress associated with climate change. This study compared the reef-building capacity of different shallow-water habitats at twenty-four sites on each of two islands, Palau and Yap, in the western Pacific Ocean. We were particularly interested in estimating the inverse problem of calculating the value of live coral cover at which net carbonate production becomes negative, and whether that value varied across …

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Search For A Heavy Right-Handed W Boson And A Heavy Neutrino In Events With Two Same-Flavor Leptons And Two Jets At S√=13 Tev, The Cms Collaboration, A. M. Sirunyan, A. Tumasyan, Marc M. Baarmand, Vallary Bhopatkar, Stefano Colafranceschi, Marcus Hohlmann, Daniel Noonan, Tuhin Roy, Francisco Yumiceva May 2018

Search For A Heavy Right-Handed W Boson And A Heavy Neutrino In Events With Two Same-Flavor Leptons And Two Jets At S√=13 Tev, The Cms Collaboration, A. M. Sirunyan, A. Tumasyan, Marc M. Baarmand, Vallary Bhopatkar, Stefano Colafranceschi, Marcus Hohlmann, Daniel Noonan, Tuhin Roy, Francisco Yumiceva

Aerospace, Physics, and Space Science Faculty Publications

A search for a heavy right-handed W boson (WR) decaying to a heavy right-handed neutrino and a charged lepton in events with two same-flavor leptons (e or μ) and two jets, is presented. The analysis is based on proton-proton collision data, collected by the CMS Collaboration at the LHC in 2016 and corresponding to an integrated luminosity of 35.9 fb−1. No significant excess above the standard model expectation is seen in the invariant mass distribution of the dilepton plus dijet system. Assuming that couplings are identical to those of the standard model, and that only one heavy neutrino flavor NR …

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Measurement Of Associated Z + Charm Production In Proton–Proton Collisions At √S=8tev, A. M. Sirunyan, Marc M. Baarmand, Vallary Bhopatkar, Stefano Colafranceschi, Marcus Hohlmann, Daniel Noonan, Tuhin Roy, Francisco Yumiceva, The Cms Collaboration Apr 2018

Measurement Of Associated Z + Charm Production In Proton–Proton Collisions At √S=8tev, A. M. Sirunyan, Marc M. Baarmand, Vallary Bhopatkar, Stefano Colafranceschi, Marcus Hohlmann, Daniel Noonan, Tuhin Roy, Francisco Yumiceva, The Cms Collaboration

Aerospace, Physics, and Space Science Faculty Publications

A study of the associated production of a Z boson and a charm quark jet (Z + c), and a comparison to production with a b quark jet (Z + b), in p p collisions at a centre-of-mass energy of 8TeV are presented. The analysis uses a data sample corresponding to an integrated luminosity of 19.7fb-1, collected with the CMS detector at the CERN LHC. The Z boson candidates are identified through their decays into pairs of electrons or muons. Jets originating from heavy flavour quarks are identified using semileptonic decays of c or b flavoured hadrons and hadronic decays …

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Robust Microplate-Based Methods For Culturing And In Vivo Phenotypic Screening Of Chlamydomonas Reinhardtii, Timothy C. Haire, Cody Bell, Kirstin Cutshaw, Brendan Swiger, Kurt Winkelmann, Andrew G. Palmer Mar 2018

Robust Microplate-Based Methods For Culturing And In Vivo Phenotypic Screening Of Chlamydomonas Reinhardtii, Timothy C. Haire, Cody Bell, Kirstin Cutshaw, Brendan Swiger, Kurt Winkelmann, Andrew G. Palmer

Biomedical Engineering and Sciences Faculty Publications

Chlamydomonas reinhardtii (Cr), a unicellular alga, is routinely utilized to study photosynthetic biochemistry, ciliary motility, and cellular reproduction. Its minimal culture requirements, unicellular morphology, and ease of transformation have made it a popular model system. Despite its relatively slow doubling time, compared with many bacteria, it is an ideal eukaryotic system for microplate-based studies utilizing either, or both, absorbance as well as fluorescence assays. Such microplate assays are powerful tools for researchers in the areas of toxicology, pharmacology, chemical genetics, biotechnology, and more. However, while microplate-based assays are valuable tools for screening biological systems, these methodologies can significantly alter the …

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Synthesis, Structure And Reactivity Of Heterobimetallic Complexes For Small Molecule Activation And Catalysis, Amelie Nicolay Jan 2018

Synthesis, Structure And Reactivity Of Heterobimetallic Complexes For Small Molecule Activation And Catalysis, Amelie Nicolay

Link Foundation Energy Fellowship Reports

Society remains tied to fossil fuels while increasing pressure on the climate suggests a transition to renewable energy resources. However, the efficiency of processes enabling such a transition has considerable room for improvement. Relevantly, natural systems have evolved enzymes that enable a very efficient conversion of small molecules such as H2, CO and CO2,1 and perform these conversions more selectively and under milder conditions than current industrial processes. Many of these enzymes rely on multimetallic, and often heterometallic, active sites of abundant transition metals, for example in [NiFe] or [CuMo] carbon monoxide dehydrogenases.2 In addition, close proximity between metal centers …

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Search For New Physics In Events With A Leptonically Decaying Z Boson And A Large Transverse Momentum Imbalance In Proton–Proton Collisions At √S = 13 Tev, A. M. Sirunyan, Marc M. Baarmand, Vallary Bhopatkar, Stefano Colafranceschi, Marcus Hohlmann, Daniel Noonan, Tuhin S. Roy, F. Yumiceva, The Cms Collaboration Jan 2018

Search For New Physics In Events With A Leptonically Decaying Z Boson And A Large Transverse Momentum Imbalance In Proton–Proton Collisions At √S = 13 Tev, A. M. Sirunyan, Marc M. Baarmand, Vallary Bhopatkar, Stefano Colafranceschi, Marcus Hohlmann, Daniel Noonan, Tuhin S. Roy, F. Yumiceva, The Cms Collaboration

Aerospace, Physics, and Space Science Faculty Publications

A search for new physics in events with a Z boson produced in association with large missing transverse momentum at the LHC is presented. The search is based on the 2016 data sample of proton-proton collisions recorded with the CMS experiment at s=13TeV, corresponding to an integrated luminosity of 35.9fb-1. The results of this search are interpreted in terms of a simplified model of dark matter production via spin-0 or spin-1 mediators, a scenario with a standard-model-like Higgs boson produced in association with the Z boson and decaying invisibly, a model of unparticle production, and a model with large extra …

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Whole Earth Telescope Discovery Of A Strongly Distorted Quadrupole Pulsation In The Largest Amplitude Rapidly Oscillating Ap Star, Daniel L. Holdsworth, Donald W. Kurtz, Hideyuki Saio, Judith L. Provençal, Bruno Letarte, Ramotholo R. Sefako, Véronique Petit, Barry Smalley, H. Thomsen, C. L. Fletcher Jan 2018

Whole Earth Telescope Discovery Of A Strongly Distorted Quadrupole Pulsation In The Largest Amplitude Rapidly Oscillating Ap Star, Daniel L. Holdsworth, Donald W. Kurtz, Hideyuki Saio, Judith L. Provençal, Bruno Letarte, Ramotholo R. Sefako, Véronique Petit, Barry Smalley, H. Thomsen, C. L. Fletcher

Aerospace, Physics, and Space Science Faculty Publications

We present a new analysis of the rapidly oscillating Ap (roAp) star, 2MASS J19400781 - 4420093 (J1940; V = 13.1). The star was discovered using SuperWASP broad-band photometry to have a frequency of 176.39 d-1 (2041.55 μHz; P = 8.2min; Holdsworth et al. 2014a) and is shown here to have a peak-to-peak amplitude of 34 mmag. J1940 has been observed during three seasons at the South African Astronomical Observatory, and has been the target of a Whole Earth Telescope campaign. The observations reveal that J1940 pulsates in a distorted quadrupole mode with unusual pulsational phase variations. A higher signal-to-noise ratio …

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