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Articles 1 - 12 of 12
Full-Text Articles in Physical Sciences and Mathematics
Properly Handling Negative Values In The Calculation Of Binding Constants By Physicochemical Modeling Of Spectroscopic Titration Data, Nathanael P. Kazmierczak, Douglas A. Vander Griend
Properly Handling Negative Values In The Calculation Of Binding Constants By Physicochemical Modeling Of Spectroscopic Titration Data, Nathanael P. Kazmierczak, Douglas A. Vander Griend
University Faculty Publications and Creative Works
To implement equilibrium hard-modeling of spectroscopic titration data, the analyst must make a variety of crucial data processing choices that address negative absorbance and molar absorptivity values. The efficacy of three such methodological options is evaluated via high-throughput Monte Carlo simulations, root-mean-square error surface mapping, and two mathematical theorems. Accuracy of the calculated binding constant values constitutes the key figure of merit used to compare different data analysis approaches. First, using singular value decomposition to filter the raw absorbance data prior to modeling often reduces the number of negative values involved but has little effect on the calculated binding constant …
Revisiting Volumes Of Lipid Components In Bilayers, John F. Nagle, Richard M. Venable, Ezekiel Maroclo-Kemmerling, Stephanie Tristram-Nagle
Revisiting Volumes Of Lipid Components In Bilayers, John F. Nagle, Richard M. Venable, Ezekiel Maroclo-Kemmerling, Stephanie Tristram-Nagle
University Faculty Publications and Creative Works
In addition to obtaining the highly precise volumes of lipids in lipid bilayers, it has been desirable to obtain the volumes of parts of each lipid, such as the methylenes and terminal methyls on the hydrocarbon chains and the head group. Obtaining such component volumes from experiment and from simulations is re-examined, first by distinguishing methods based on apparent versus partial molar volumes. Although somewhat different, both these methods give results that are counterintuitive and that differ from results obtained by a more local method that can only be applied to simulations. These comparisons reveal differences in the average methylene …
Northern Bottlenose Whales In A Pristine Environment Respond Strongly To Close And Distant Navy Sonar Signals, Paul J. Wensveen, Saana Isojunno, Rune R. Hansen, Alexander M. Von Benda-Beckmann, Stacy L. Deruiter
Northern Bottlenose Whales In A Pristine Environment Respond Strongly To Close And Distant Navy Sonar Signals, Paul J. Wensveen, Saana Isojunno, Rune R. Hansen, Alexander M. Von Benda-Beckmann, Stacy L. Deruiter
University Faculty Publications and Creative Works
Impact assessments for sonar operations typically use received sound levels to predict behavioural disturbance in marine mammals. However, there are indications that cetaceans may learn to associate exposures from distant sound sources with lower perceived risk. To investigate the roles of source distance and received level in an area without frequent sonar activity, we conducted multi-scale controlled exposure experiments ( n = 3) with 12 northern bottlenose whales near Jan Mayen, Norway. Animals were tagged with high-resolution archival tags ( n = 1 per experiment) or medium-resolution satellite tags ( n = 9 in total) and subsequently exposed to sonar. …
Visualizing Classic Synchronization, Joel C. Adams, Elizabeth R. Koning, Christiaan D. Hazlett
Visualizing Classic Synchronization, Joel C. Adams, Elizabeth R. Koning, Christiaan D. Hazlett
University Faculty Publications and Creative Works
Classic synchronization problems are often used to introduce students to the subtleties of concurrency and synchronization mechanisms, such as semaphores, monitors, locks, and condition variables. The Dining Philosophers, Producers-Consumers, and Readers-Writers are all classic problems in which a correct solution requires the actions of multiple processes or threads to be synchronized. In this paper, we present visualizations for these three problems and describe their use as pedagogical tools to help students build accurate mental models of concurrency abstractions such as starvation, deadlock, livelock, and correct execution. We also present the results of an experiment that indicate students find using these …
A Constructive Approach To Higher Homotopy Operations, David Blanc, Mark W. Johnson, James M. Turner
A Constructive Approach To Higher Homotopy Operations, David Blanc, Mark W. Johnson, James M. Turner
University Faculty Publications and Creative Works
In this paper we provide an explicit general construction of higher homotopy operations in model categories, which include classical examples such as (long) Toda brackets and (iterated) Massey products, but also cover unpointed operations not usually considered in this context. We show how such operations, thought of as obstructions to rectifying a homotopy-commutative diagram, can be defined in terms of a double induction, yielding intermediate obstructions as well.
Forging Relationships Between Faith-Based And Secular Organizations To Address The Global Water Crisis A Case Study From Liberia, Kristin R. Alford, Jamison L. Koeman
Forging Relationships Between Faith-Based And Secular Organizations To Address The Global Water Crisis A Case Study From Liberia, Kristin R. Alford, Jamison L. Koeman
University Faculty Publications and Creative Works
It is imperative to engage in interdisciplinary and multisector partnerships as we seek to develop and deliver effective solutions to address the global water crisis. These partnerships allow us to live out our Christian charge to demand justice for the vulnerable and promote human flourishing. This case study reviews the benefits and challenges of multisector partnerships between faith-based and secular organizations using the example of a multi-year water filter distribution project in Liberia. Benefits of the partnership include shared expertise, investment in students and Liberians, and results-driven research. Challenges include differing sub-goals, logistical challenges, communication difficulties, and different ways of …
Behavioral Responses Of Individual Blue Whales (Balaenoptera Musculus) To Mid-Frequency Military Sonar, Brandon L. Southall, Stacy L. Deruiter, Ari Friedlaender, Alison K. Stimpert
Behavioral Responses Of Individual Blue Whales (Balaenoptera Musculus) To Mid-Frequency Military Sonar, Brandon L. Southall, Stacy L. Deruiter, Ari Friedlaender, Alison K. Stimpert
University Faculty Publications and Creative Works
This study measured the degree of behavioral responses in blue whales (Balaenoptera musculus) to controlled noise exposure off the southern California coast. High-resolution movement and passive acoustic data were obtained from non-invasive archival tags (n=42) whereas surface positions were obtained with visual focal follows. Controlled exposure experiments (CEEs) were used to obtain direct behavioral measurements before, during and after simulated and operational military mid-frequency active sonar (MFAS), pseudorandom noise (PRN) and controls (no noise exposure). For a subset of deep-feeding animals (n=21), active acoustic measurements of prey were obtained and used as contextual covariates in response analyses. To investigate potential …
Variations In Sensitivity To Chlorine In Ecuador And Us Consumers Implications For Community Water Systems, Jacob Stout, Donald J. Tellinghuisen, David B. Wunder, Chad D. Tatko
Variations In Sensitivity To Chlorine In Ecuador And Us Consumers Implications For Community Water Systems, Jacob Stout, Donald J. Tellinghuisen, David B. Wunder, Chad D. Tatko
University Faculty Publications and Creative Works
Successful implementation of chlorination for disinfecting community water systems in developing countries faces obstacles, with rejection of chlorinous flavor as a significant factor. Determining consumers' abilities to accurately detect chlorine in treated water is important to identifying acceptable chlorination levels that are also effective for water disinfection. Chlorine detection sensitivity was tested in untrained Ecuadorian consumers with limited prior experience with chlorinated water and US consumers with extensive prior experience with chlorinated water. Water samples with free chlorine concentrations up to 3.0 mg/L were presented for flavor testing. Ecuadorian consumers showed higher sensitivity, being able to detect chlorination at 2.0 …
Mathematics Of The Infinite God In The Works Of Nicholas Of Cusa, Lauren Henderson
Mathematics Of The Infinite God In The Works Of Nicholas Of Cusa, Lauren Henderson
Beets Paper Contest
The geometrical analyses of infinity exemplified in the work of Nicholas of Cusa can aid in understanding the complex nature of God’s attributes, specifically the perceived tension between his simplicity and his quality of encompassing and upholding all things.
A Family Of Cantorvals, John Ferdinands, Timothy Ferdinands
A Family Of Cantorvals, John Ferdinands, Timothy Ferdinands
University Faculty Publications and Creative Works
The set of subsums of the series Σn=1∞ xn is known to be one of three types: a finite union of intervals, homeomorphic to the Cantor set, or of the type known as a Cantorval. Bartoszewicz, Filipczak and Szymonik have described a family of series which contained all known examples of subsum sets which are Cantorvals. We construct another family of series which produces new examples of subsum sets which are Cantorvals.
Lower Atmosphere And Pressure Evolution On Pluto From Ground-Based Stellar Occultations, 1988-2016, E. Meza, B. Sicardy, M. Assafin, J. L. Ortiz
Lower Atmosphere And Pressure Evolution On Pluto From Ground-Based Stellar Occultations, 1988-2016, E. Meza, B. Sicardy, M. Assafin, J. L. Ortiz
University Faculty Publications and Creative Works
Context. The tenuous nitrogen (N2) atmosphere on Pluto undergoes strong seasonal effects due to high obliquity and orbital eccentricity, and has recently (July 2015) been observed by the New Horizons spacecraft. Aims. The main goals of this study are (i) to construct a well calibrated record of the seasonal evolution of surface pressure on Pluto and (ii) to constrain the structure of the lower atmosphere using a central flash observed in 2015. Methods. Eleven stellar occultations by Pluto observed between 2002 and 2016 are used to retrieve atmospheric profiles (density, pressure, temperature) between altitude levels of ∼5 and ∼380 km …
Floristic Quality Assessments Of Remnant Natural Areas In The Greater Grand Rapids, Michigan Region: Evaluating Botanical Change Since The 1890s, Alan W. Stockdale, Garrett Crow, David P. Warners
Floristic Quality Assessments Of Remnant Natural Areas In The Greater Grand Rapids, Michigan Region: Evaluating Botanical Change Since The 1890s, Alan W. Stockdale, Garrett Crow, David P. Warners
Faculty and Professional Research
In 1901, Emma J. Cole, a beloved high school teacher and distinguished botanist, published Grand Rapids Flora. Cole’s floristic inventory remains the most comprehensive botanical study of the greater Grand Rapids, Michigan region, even though this area has experienced significant land- scape alterations since her publication. To address this knowledge gap, in 2014 we embarked on a multiple-year project aimed to discover and reassess the sites Cole described, as well as to catalog other natural remnant locations within the Grand Rapids area. This paper reports botanical invento- ries that were completed at eight sites within Kent County during 2015 and …