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Articles 1 - 30 of 1913

Full-Text Articles in Physical Sciences and Mathematics

A Biological Condition Gradient For Coral Reefs In The Us Caribbean Territories: Part I. Coral Narrative Rules, Deborah Santavy, Susan K. Jackson, Benjamin Jessup, Jeroen Gerritsen, Caroline Rogers, William S. Fisher, Ernesto Weil, Alina Szmant, David Cuevas-Miranda, Brian Walker, Christopher Jeffrey, Patricia Bradley, David Ballantine, Loretta Roberson, Hector Ruiz-Torres, Brandi Todd, Tyler Smith, Randy Clark, Ernesto Diaz, Jorge Bauzá-Ortega, Christina Horstmann, Sandy Raimondo May 2022

A Biological Condition Gradient For Coral Reefs In The Us Caribbean Territories: Part I. Coral Narrative Rules, Deborah Santavy, Susan K. Jackson, Benjamin Jessup, Jeroen Gerritsen, Caroline Rogers, William S. Fisher, Ernesto Weil, Alina Szmant, David Cuevas-Miranda, Brian Walker, Christopher Jeffrey, Patricia Bradley, David Ballantine, Loretta Roberson, Hector Ruiz-Torres, Brandi Todd, Tyler Smith, Randy Clark, Ernesto Diaz, Jorge Bauzá-Ortega, Christina Horstmann, Sandy Raimondo

Marine & Environmental Sciences Faculty Articles

As coral reef condition and sustainability continue to decline worldwide, losses of critical habitat and their ecosystem services have generated an urgency to understand and communicate reef response to management actions, environmental contamination, and natural disasters. Increasingly, coral reef protection and restoration programs emphasize the need for robust assessment tools for protecting high-quality waters and establishing conservation goals. Of equal importance is the need to communicate assessment results to stakeholders, beneficiaries, and the public so that environmental consequences of decisions are understood. The Biological Condition (BCG) model provides a structure to evaluate the condition of a coral reef in increments ...


Length-Based Risk Analysis Of Management Options For The Southern Florida Usa Multispecies Coral Reef Fish Fishery, Jerald Ault, Steven G. Smith, Matthew W. Johnson, Laura Jay W. Grove, James A. Bohnsack, Gerard T. Dinardo, Caroline Mclaughlin, Nelson M. Ehrhardt, Vanessa Mcdonough, Michael P. Seki, Steven Miller, Jiangang Luo, Jeremiah Blondeau, Michael P. Crosby, Glenn Simpson, Mark E. Monaco, Clayton G. Pollock, Michael W. Feeley, Alejandro Acosta May 2022

Length-Based Risk Analysis Of Management Options For The Southern Florida Usa Multispecies Coral Reef Fish Fishery, Jerald Ault, Steven G. Smith, Matthew W. Johnson, Laura Jay W. Grove, James A. Bohnsack, Gerard T. Dinardo, Caroline Mclaughlin, Nelson M. Ehrhardt, Vanessa Mcdonough, Michael P. Seki, Steven Miller, Jiangang Luo, Jeremiah Blondeau, Michael P. Crosby, Glenn Simpson, Mark E. Monaco, Clayton G. Pollock, Michael W. Feeley, Alejandro Acosta

Marine & Environmental Sciences Faculty Articles

Exploitation impacts and management options for 15 coral reef fish species central to the commercial and recreational fisheries of the southern Florida USA coral reef ecosystem were evaluated using a length-based risk analysis (LBRA) framework. Population abundance-at-length composition data were obtained from several regional federal-state sampling programs. These and updated life history demographic data were integrated into a length-based numerical cohort model to generate LBRA fishery sustainability metrics from a probabilistic perspective. Three of five groupers, eight of eight snappers, and two of two grunts were below the 40% spawning potential ratio (SPR) stock sustainability minimum; ten of these stocks ...


A Novel Tcr Clustering Method For Sars-Cov-2 Epitopes, Naziba A. Nuha Apr 2022

A Novel Tcr Clustering Method For Sars-Cov-2 Epitopes, Naziba A. Nuha

Mathematics Colloquium Series

T-cell epitopes are peptides generated from antigens that are presented by MHC class I and class II molecules to T-cells. These epitopes are usually identified by T-cell receptors (TCRs) of CD4 T-cells which then causes transformation of CD4 T-cells to helper or regulatory T cells. Recently, there has been growing interest in the role of T cells and their involvement in various ailments including SARS-COV-2, cancer, autoimmune diseases and other infectious diseases. However, the mechanism of TCR epitope recognition by Tcell receptors (TCRs) of CD4 T-cells at a repertoire level is still not fully understood. In this project, we reviewed ...


A Weighted Probability Measure For Objects In Euclidean Space, Alessandro Xello Apr 2022

A Weighted Probability Measure For Objects In Euclidean Space, Alessandro Xello

Mathematics Colloquium Series

Since we were little kids, we developed our own sense dimension as a measure of some kind of extent. Whether it be length, width, or height, we intuitively understand how these features fit in the three-dimensional world we live in, and how to measure it. Nevertheless, mathematicians have found themselves dealing with objects, like fractals, and spaces, like R4 , that challenge our intuitive and self-developed definition of measure, to the point that it is not sufficient anymore. Lebesgue measure and Harsdorf measure for example are ways of assigning a measure to objects that belong to n-dimensional Euclidean spaces, in an ...


Modeling And Simulation Of Microscopic Fibers In A Viscous Fluid, William Mitchell Apr 2022

Modeling And Simulation Of Microscopic Fibers In A Viscous Fluid, William Mitchell

Mathematics Colloquium Series

In biology, the movements of tiny structures often rely on the mechanical properties of long, thin tubes. For example, bacteria swim by rotating their flagella, and in cell division (mitosis) the two copies of the DNA must be pulled apart by microtubules. To understand these processes it is very tempting to take advantage of the large aspect ratio of the thin structures, for example by modeling them as one-dimensional curves rather than as more complicated objects with volume and surface area. This kind of shortcut saves a lot of work! I will describe one standard and widely used tool known ...


Comparative Toxicity Of Hydrocarbons For Evaluation Of Lysmata Boggessi As An Experimental Proxy For Deep-Water Column Micronekton, Dorothy-Ellen A. Renegar, Nicholas Turner, Gopal Bera, Eileen G. Whitemiller, Bernhard Riegl, Jose Sericano, Anthony H. Knap Mar 2022

Comparative Toxicity Of Hydrocarbons For Evaluation Of Lysmata Boggessi As An Experimental Proxy For Deep-Water Column Micronekton, Dorothy-Ellen A. Renegar, Nicholas Turner, Gopal Bera, Eileen G. Whitemiller, Bernhard Riegl, Jose Sericano, Anthony H. Knap

Marine & Environmental Sciences Faculty Articles

The potential impacts of sub-surface hydrocarbon plumes to deep-water column micronekton are an important consideration in a more complete understanding of ecosystem effects resulting from deep-sea oil spills. However, evaluating toxicity in these organisms presents multiple challenges, and the use of a shallow-water proxy species allows comparison and validation of experimental results. This study thus examined the suitability of the peppermint shrimp, Lysmata boggessi, as an experimental proxy for ecologically important deep-sea zooplankton/micronekton in hydrocarbon toxicity assays. This crustacean species occurs in shallow coastal marine environments throughout the western Atlantic, Caribbean and Gulf of Mexico, is similar in size ...


How Prey Defense Patterns Predator-Prey Distributions, Evan Haskell Mar 2022

How Prey Defense Patterns Predator-Prey Distributions, Evan Haskell

Mathematics Colloquium Series

In ecology, predator and prey species share a common interest in survival. However, this common interest places these species at odds with each other. Predators need to consume prey for their survival. Prey, on the other hand, do not survive if they are consumed. To meet their needs, predators engage in foraging or prey-taxis behaviors whereby they seek areas of high prey density. For prey there are numerous defense strategies to engage including aposematic mechanisms to advertise they are not worth the predator’s while, attacking the predator through chemical or community defense mechanisms, and alarm calls to seek assistance ...


[Opinion Piece] Comparison Of Recent Survey Techniques For Estimating Benthic Cover On Caribbean Mesophotic Reefs, Joseph R. Pawlik, Roy A. Armstrong, Stephanie Farrington, John Reed, Sara Rivero-Calle, Hanumant Singh, Brian Walker, Jason White Mar 2022

[Opinion Piece] Comparison Of Recent Survey Techniques For Estimating Benthic Cover On Caribbean Mesophotic Reefs, Joseph R. Pawlik, Roy A. Armstrong, Stephanie Farrington, John Reed, Sara Rivero-Calle, Hanumant Singh, Brian Walker, Jason White

Marine & Environmental Sciences Faculty Articles

Highly divergent estimates of benthic cover of sponges have been reported for Caribbean mesophotic reefs (90-100 m) based on quadrat point-intercept data collection using 2 methods: visual surveys conducted in situ by technical divers, and analyses of photographs taken by unmanned underwater vehicles (UUVs). The second method has been criticized for potential errors from image distortion caused by variable camera angle relative to the substratum, but without a broader comparison of both methods. We find that studies that have used the UUV-based method are advantageous for a number of reasons, most importantly: (1) access to the full mesophotic zone, (2 ...


Analysis Of The Magnetic Signature Of Surface Waves Measured In A Laboratory Experiment, John Kluge, Alex Soloviev, Cayla W. Dean, Geoffrey K. Morrison, Brian K. Haus Mar 2022

Analysis Of The Magnetic Signature Of Surface Waves Measured In A Laboratory Experiment, John Kluge, Alex Soloviev, Cayla W. Dean, Geoffrey K. Morrison, Brian K. Haus

Marine & Environmental Sciences Faculty Articles

A magnetic signature is created by secondary magnetic field fluctuations caused by the phenomenon of seawater moving in Earth’s magnetic field. A laboratory experiment was conducted at the SUrge STructure Atmosphere INteraction (SUSTAIN) facility to measure the magnetic signature of surface waves using a differential method: a pair of magnetometers, separated horizontally by one-half wavelength, were placed at several locations on the outer tank walls. This technique significantly reduced the extraneous magnetic distortions that were detected simultaneously by both sensors and additionally doubled the magnetic signal of surface waves. Accelerometer measurements and local gradients were used to identify magnetic ...


Numerical Schemes For Integro-Differential Equations Related To Alpha-Stable Processes, Xiaofan Li Mar 2022

Numerical Schemes For Integro-Differential Equations Related To Alpha-Stable Processes, Xiaofan Li

Mathematics Colloquium Series

The mean first exit time, escape probability and transitional probability densities are utilized to quantify dynamical behaviors of stochastic differential equations with non-Gaussian, α-stable type Lévy motions. Taking advantage of the Toeplitz matrix structure of the time-space discretization, a fast and accurate numerical algorithm is proposed to simulate the nonlocal Fokker-Planck equations on either a bounded or infinite domain. Under a specified condition, the scheme is shown to satisfy a discrete maximum principle and to be convergent. The numerical results for two prototypical stochastic systems, the Ornstein-Uhlenbeck system and the double-well system are shown.


Spatial And Temporal Patterns Of Fire On Saipan, Cnmi, Ilan E. Bubb, Zachary B. Williams Mar 2022

Spatial And Temporal Patterns Of Fire On Saipan, Cnmi, Ilan E. Bubb, Zachary B. Williams

Marine & Environmental Sciences Faculty Articles

Sediment core studies from Saipan suggest that fires did not play a prominent role in the disturbance regime of the Mariana Islands and have increased in frequency since human settlement around 4,000 years ago. On Saipan fires are understood to interrupt the pattern of succession leading to the degradation of native limestone forests, the proliferation of grasslands and the eventual creation of badlands. Little baseline data regarding the spatial and temporal patterns of fire on Saipan exist to create effective Fire Management Plans. This project uses Landsat 8 images from April 2013 to July 2020 and the Normalized Burn ...


Experiment 2.01: Coulomb’S Law, Diego Castano Mar 2022

Experiment 2.01: Coulomb’S Law, Diego Castano

Physics Lab Experiments with Simulated Data for Remote Delivery

The charge resulting from the static electrification of a Teflon plate is determined through its interaction with a neutral conducting sphere.


Experiment 2.10: Lenses, Diego Castano, Victor Castro Mar 2022

Experiment 2.10: Lenses, Diego Castano, Victor Castro

Physics Lab Experiments with Simulated Data for Remote Delivery

The focal lengths of converging and diverging lenses are determined.


Experiment 2.09: Reflection And Refraction, Diego Castano, Victor Castro Mar 2022

Experiment 2.09: Reflection And Refraction, Diego Castano, Victor Castro

Physics Lab Experiments with Simulated Data for Remote Delivery

The laws of geometrical optics are studied by tracking light rays refracting across an air-glass boundary and reflecting off convex and concave mirrors.


Experiment 2.08: Series Rlc Ac-Circuit, Diego Castano, Victor Castro Mar 2022

Experiment 2.08: Series Rlc Ac-Circuit, Diego Castano, Victor Castro

Physics Lab Experiments with Simulated Data for Remote Delivery

Using the resonant behavior of a circuit consisting of a coil and known capacitor, the coil’s self-inductance and resistance are determined.


Experiment 2.07: Magnetic Field Of The Earth, Diego Castano, Victor Castro Mar 2022

Experiment 2.07: Magnetic Field Of The Earth, Diego Castano, Victor Castro

Physics Lab Experiments with Simulated Data for Remote Delivery

The earth’s horizontal component of magnetic field is determined using a tangent galvanometer.


Experiment 2.06: Series Rc Dc-Circuit, Diego Castano, Victor Castro Mar 2022

Experiment 2.06: Series Rc Dc-Circuit, Diego Castano, Victor Castro

Physics Lab Experiments with Simulated Data for Remote Delivery

The capacitances of two unknown capacitors are determined examining their charging behavior.


Experiment 2.05: Wheatstone Bridge, Diego Castano Mar 2022

Experiment 2.05: Wheatstone Bridge, Diego Castano

Physics Lab Experiments with Simulated Data for Remote Delivery

The Wheatstone Bridge is used to determine the resistances of five resistors.


Experiment 2.04: Kirchhoff’S Laws, Diego Castano, Andrew Kiene Mar 2022

Experiment 2.04: Kirchhoff’S Laws, Diego Castano, Andrew Kiene

Physics Lab Experiments with Simulated Data for Remote Delivery

A non-trivial resistor arrangement is analyzed


Experiment 2.03: Ohm’S Law, Diego Castano, Victor Castro Mar 2022

Experiment 2.03: Ohm’S Law, Diego Castano, Victor Castro

Physics Lab Experiments with Simulated Data for Remote Delivery

The resistances of three resistors are determined by varying the applied voltage and measuring the resulting current.


Experiment 2.02: Electric And Potential Fields, Diego Castano Mar 2022

Experiment 2.02: Electric And Potential Fields, Diego Castano

Physics Lab Experiments with Simulated Data for Remote Delivery

Electric field line maps for three 2-dimensional charge distributions are determined using a voltmeter.


Seizure Prediction In Epilepsy Patients, Gary Dean Cravens Feb 2022

Seizure Prediction In Epilepsy Patients, Gary Dean Cravens

NSU REACH and IPE Day

Purpose/Objective: Characterize rigorously the preictal period in epilepsy patients to improve the development of seizure prediction techniques. Background/Rationale: 30% of epilepsy patients are not well-controlled on medications and would benefit immensely from reliable seizure prediction. Methods/Methodology: Computational model consisting of in-silico Hodgkin-Huxley neurons arranged in a small-world topology using the Watts-Strogatz algorithm is used to generate synthetic electrocorticographic (ECoG) signals. ECoG data from 18 epilepsy patients is used to validate the model. Unsupervised machine learning is used with both patient and synthetic data to identify potential electrophysiologic biomarkers of the preictal period. Results/Findings: The model has ...


From Derivation To Error Analysis Of Splitting Methods—A Contemporary Review, Qin Sheng Feb 2022

From Derivation To Error Analysis Of Splitting Methods—A Contemporary Review, Qin Sheng

Mathematics Colloquium Series

Splitting methods, with representative examples such as ADI (alternating-direction implicit) method and LOD (local one-dimensional) method, have been playing a significant role for the numerical solution of differential equations. In this talk, we will start from a seemed-to-be obvious issue as an introduction of the modern splitting methods. Historical roots of the literature will be mentioned. We will then use a splitting approach for solving a semi-linear Kawarada partial differential equation which is extremely important to numerical combustion, environmental protection, and biomedical research. Finally, the concept of global error and its estimates will be discussed and extended.


Case Study: Degenerative Joint Disease In Canines, Zachary B. Lawrence, Rusty Rogers, Emily Schmitt Lavin Jan 2022

Case Study: Degenerative Joint Disease In Canines, Zachary B. Lawrence, Rusty Rogers, Emily Schmitt Lavin

Mako: NSU Undergraduate Student Journal

Degenerative joint disease (DJD) is the gradual degeneration of cartilage in joints, resulting in pain for the affected areas. This study focused on Lacy (name changed for privacy), a 10-year-old spayed female chihuahua mix, that was clinically diagnosed for DJD and treated by Dr. Rogers over a period of 15 months. DJD is typically treated through a combination of pharmacological management, nonpharmacological treatment, and changes in lifestyle. Pharmacological treatment utilized pain medications, such as Gabapentin and Tramadol. Nonpharmacological treatment and changes in lifestyle involve methods, such as maintaining an ideal body weight, to decrease pain and increase mobility. However, during ...


Light-Driven Dynamics Between Calcification And Production In Functionally Diverse Coral Reef Calcifiers, Jennifer Mallon, Tyler Cyronak, Emily R. Hall, Anastazia T. Banaszak, Dan A. Exton, Adrian M. Bass Jan 2022

Light-Driven Dynamics Between Calcification And Production In Functionally Diverse Coral Reef Calcifiers, Jennifer Mallon, Tyler Cyronak, Emily R. Hall, Anastazia T. Banaszak, Dan A. Exton, Adrian M. Bass

Marine & Environmental Sciences Faculty Articles

Coral reef metabolism underpins ecosystem function and is defined by the processes of photosynthesis, respiration, calcification, and calcium carbonate dissolution. However, the relationships between these physiological processes at the organismal level and their interactions with light remain unclear. We examined metabolic rates across a range of photosynthesising calcifiers in the Caribbean: the scleractinian corals Acropora cervicornis, Orbicella faveolata, Porites astreoides, and Siderastrea siderea, and crustose coralline algae (CCA) under varying natural light conditions. Net photosynthesis and calcification showed a parabolic response to light across all species, with differences among massive corals, branching corals, and CCA that reflect their relative functional ...


Experiment 1.02: Acceleration Due To Gravity: Vertical Drop, Diego Castano Jan 2022

Experiment 1.02: Acceleration Due To Gravity: Vertical Drop, Diego Castano

Physics Lab Experiments with Simulated Data for Remote Delivery

The acceleration due to gravity is determined from the fall of a metal sphere.


Experiment 1.01: Measurement, Diego Castano, Victor Castro Jan 2022

Experiment 1.01: Measurement, Diego Castano, Victor Castro

Physics Lab Experiments with Simulated Data for Remote Delivery

Introduction to measurement/data analysis; measurements of an aluminum cylinder and cuboid are used to determine their densities.


Experiment 1.10: Standing Waves On Strings, Diego Castano Jan 2022

Experiment 1.10: Standing Waves On Strings, Diego Castano

Physics Lab Experiments with Simulated Data for Remote Delivery

The fourth harmonic of a vibrating string is used to determine the acceleration due to gravity.


Experiment 1.09: The Simple Pendulum, Diego Castano Jan 2022

Experiment 1.09: The Simple Pendulum, Diego Castano

Physics Lab Experiments with Simulated Data for Remote Delivery

A simple pendulum is used to determine the acceleration due to gravity.


Experiment 1.07: Torque, Diego Castano Jan 2022

Experiment 1.07: Torque, Diego Castano

Physics Lab Experiments with Simulated Data for Remote Delivery

A mechanical balance is used to study the role of torque in states of static equilibrium.