Derivation of a three dimensional numerical water quality model for estuary and continental shelf application

A derivation is given for a three dimensional mass transport equation which is appropriate for numerical modeling of estuary and continental shelf water quality variations for both the time dependent and steady state cases. A finite difference approximation to the derived equation is presented and a solution scheme for the resulting equations outlined. Preliminary results are obtained using the model for the extremely simple problems which have analytical solutions. The numerical model, as presented, will provide a scheme to study water quality problems in coastal waters for both steady state and time dependent cases

Development and application of a three dimensional numerical model for predicting pollutant and sediment transport using an Eulerian-Lagrangian marker particle technique

A computer coded Lagrangian marker particle in Eulerian finite difference cell solution to the three dimensional incompressible mass transport equation, Water Advective Particle in Cell Technique, WAPIC, was developed, verified against analytic solutions, and subsequently applied in the prediction of long term transport of a suspended sediment cloud resulting from an instantaneous dredge spoil release. Numerical results from WAPIC were verified against analytic solutions to the three dimensional incompressible mass transport equation for turbulent diffusion and advection of Gaussian dye releases in unbounded uniform and uniformly sheared uni-directional flow, and for steady-uniform plug channel flow. WAPIC was utilized to simulate an analytic solution for non-equilibrium sediment dropout from an initially vertically uniform particle distribution in one dimensional turbulent channel flow

A Case Study Tested Framework for Multivariate Analyses of Microbiomes: Software for Microbial Community Comparisons

The study of microbiomes is important because our understanding of microbial communities is providing insight into human health and many other areas of interest. Researchers often use genomic data to study microbial organisms, demonstrating differences from one organism to the next. Metagenomic data is utilized to study communities of microbial organisms. The research described herein involved the development of a collection of computational methods. This suite of computational methods and tools (written in the R and Perl languages) has become a framework used for metagenomic data analysis and result visualization. Multivariate analyses such as Linear Discriminate Analysis (LDA) are used to determine which microbial organisms are useful in distinguishing between microbial communities. The differences between communities are visualized in two or three dimensions using dimensional reduction techniques. Other analyses provided by the framework include, but are not limited to, feature selection, cross-validation, multi-objective optimization, side-by-side comparisons of communities, and identification of core members in a microbial community. The effectiveness of these methods and techniques was verified in multiple real world case studies such as body fat classification of elk using a fecal microbiome, identification of important changes in community composition when permafrost is thawed, and longitudinal classification of intestinal locations. The fecal microbiome may be used in the future to assist in assessing the health of animal populations using non-invasive samples. Additionally, the analysis of thawing permafrost may yield insight into the release of greenhouse gases into the atmosphere, furthering our understanding of global warming. Our understanding of the intestinal microbiome may someday grant us understanding and control of our intestinal well being, which plays a significant factor in immune system response and overall health

Differences of selected performance parameters of dominant and nondominant legs of soccer players

The main problem of this study was to determine if a significant strength difference existed between the mirror muscles of six muscle groups in the dominant and nondominant legs of University of the Pacific male soccer players at differing contraction speeds as measured by the Cybex II Isokinetic Dynometer

Defense Navigation Satellite Development Program

The Defense Navigation Satellite Development Program provides for test and evaluation of a new precise positioning technique and user receiver equipment. This equipment with appropriate displays will provide in real time three dimensional precise position and velocity information. The DNSDP permits test and demonstration of alternative engineering solutions to determine the configuration and characteristics of an operational Defense Navigation Satellite System for the 1980s time period. A general description of the test system is presented as well as a brief summary of its experimental applications, namely: navigation, military air traffic control (ATC), and military command and control communications

The screwworm eradication data system archives

The archives accumulated during 1 year of operation of the Satellite Temperature-Monitoring System during development of the Screwworm Eradication Data System are reported. Brief descriptions of all the kinds of tapes, as well as their potential uses, are presented. Reference is made to other documents that explain the generation of these data

Nonlinear dynamics of mode-locking optical fiber ring lasers

We consider a model of a mode-locked fiber ring laser for which the evolution of a propagating pulse in a birefringent optical fiber is periodically perturbed by rotation of the polarization state owing to the presence of a passive polarizer. The stable modes of operation of this laser that correspond to pulse trains with uniform amplitudes are fully classified. Four parameters, i.e., polarization, phase, amplitude, and chirp, are essential for an understanding of the resultant pulse-train uniformity. A reduced set of four coupled nonlinear differential equations that describe the leading-order pulse dynamics is found by use of the variational nature of the governing equations. Pulse-train uniformity is achieved in three parameter regimes in which the amplitude and the chirp decouple from the polarization and the phase. Alignment of the polarizer either near the slow or the fast axis of the fiber is sufficient to establish this stable mode locking

What\u27s so bad about hooking up?: Factors predictive of more positive perceptions following a hookup

The purpose of the study was to examine factors predictive of a more positive perceptions following a hookup. The participants included 188 students from Illinois State University. Participants completed a demographics questionnaire, the Hookup Scale, the Rosenberg Self-Esteem Scale, the Sexual Self-Esteem Inventory, religiosity questions, attitudes toward hooking up questionnaire, emotional reactions to hooking up questionnaire, and the Social Academic, Romantic, and Sexual Hooking Up Reactions Scale. The current study found that participants who reported high global self-esteem, high sexual self-esteem, and positive attitudes toward hooking up reported less regret, more positive reactions, and fewer negative reactions following a hookup

It\u27s A Great Life If You Don\u27t Weaken

https://digitalcommons.library.umaine.edu/mmb-vp/5761/thumbnail.jp