Svendsen M.B.S.,Copenhagen University |
Bushnell P.G.,Indiana University at South Bend |
Steffensen J.F.,Copenhagen University
Journal of Fish Biology | Year: 2016
Intermittent-flow respirometry is an experimental protocol for measuring oxygen consumption in aquatic organisms that utilizes the best features of closed (stop-flow) and flow-through respirometry while eliminating (or at least reducing) some of their inherent problems. By interspersing short periods of closed-chamber oxygen consumption measurements with regular flush periods, accurate oxygen uptake rate measurements can be made without the accumulation of waste products, particularly carbon dioxide, which may confound results. Automating the procedure with easily available hardware and software further reduces error by allowing many measurements to be made over long periods thereby minimizing animal stress due to acclimation issues. This paper describes some of the fundamental principles that need to be considered when designing and carrying out automated intermittent-flow respirometry (e.g. chamber size, flush rate, flush time, chamber mixing, measurement periods and temperature control). Finally, recent advances in oxygen probe technology and open source automation software will be discussed in the context of assembling relatively low cost and reliable measurement systems. © 2016 The Fisheries Society of the British Isles.
Blouin D.D.,Indiana University at South Bend
Anthrozoos | Year: 2013
This paper examines the variations in dog owners' attitudes toward, treatment of, and interactions with, animals. Based on 28 in-depth interviews with dog owners from a county in the Midwestern United States, I demonstrate that pets are an important part of many people's lives, often providing companionship, entertainment, and meaningful interactions; however, there are notable, distinct variations in how people relate to them. Pet owners typically exhibit one of three orientations toward pets: "dominionistic," "humanistic," or "protectionistic." The dominionistic have relatively low regard for their pets, valuing them primarily for the uses they provide, such as protection. Those employing the humanistic orientation elevate their pets to the status of surrogate humans and value their pets primarily for the affective benefits they enjoy from their close attachments. The protectionistic have high regard for both pets and animals more generally. They view pets as valuable companions and as creatures with their own interests. This typology offers insights for understanding the source and variety of the often ambiguous and contradictory relations between people and pets. I argue that individual characteristics and experiences impact how people understand and relate to animals, in large part, because they represent exposure to different cultural messages. I suggest that these orientations represent three sets of distinct cultural logics, each with distinct histories and contemporary sources. © ISAZ 2013.
Schimmrigk R.,Indiana University at South Bend
Communications in Mathematical Physics | Year: 2011
The program of constructing spacetime geometry from string theoretic modular forms is extended to Calabi-Yau varieties of dimensions three and four, as well as higher rank motives. Modular forms on the worldsheet can be constructed from the geometry of spacetime by computing the L-functions associated to omega motives of Calabi-Yau varieties, generated by their holomorphic n-forms via Galois representations. The modular forms that emerge in this way are related to characters of the underlying rational conformal field theory. The converse problem of constructing space from string theory proceeds in the class of diagonal theories by determining the motives associated to modular forms in the category of pure motives with complex multiplication. The emerging picture suggests that the L-function can be viewed as defining a map between the geometric category of motives and the category of conformal field theories on the worldsheet. © 2011 Springer-Verlag.
Chen S.,Indiana University at South Bend |
Zhang Y.-T.,University of Notre Dame
Journal of Computational Physics | Year: 2011
Integration factor methods are a class of " exactly linear part" time discretization methods. In [Q. Nie, Y.-T. Zhang, R. Zhao, Efficient semi-implicit schemes for stiff systems, Journal of Computational Physics, 214 (2006) 521-537], a class of efficient implicit integration factor (IIF) methods were developed for solving systems with both stiff linear and nonlinear terms, arising from spatial discretization of time-dependent partial differential equations (PDEs) with linear high order terms and stiff lower order nonlinear terms. The tremendous challenge in applying IIF temporal discretization for PDEs on high spatial dimensions is how to evaluate the matrix exponential operator efficiently. For spatial discretization on unstructured meshes to solve PDEs on complex geometrical domains, how to efficiently apply the IIF temporal discretization was open. In this paper, we solve this problem by applying the Krylov subspace approximations to the matrix exponential operator. Then we apply this novel time discretization technique to discontinuous Galerkin (DG) methods on unstructured meshes for solving reaction-diffusion equations. Numerical examples are shown to demonstrate the accuracy, efficiency and robustness of the method in resolving the stiffness of the DG spatial operator for reaction-diffusion PDEs. Application of the method to a mathematical model in pattern formation during zebrafish embryo development shall be shown. © 2011 Elsevier Inc.
Olson K.R.,Indiana University at South Bend
American Journal of Physiology - Regulatory Integrative and Comparative Physiology | Year: 2011
Hydrogen sulfide (H2S) has become the hot new signaling molecule that seemingly affects all organ systems and biological processes in which it has been investigated. It has also been shown to have both proinflammatory and anti-inflammatory actions and proapoptotic and anti-apoptotic effects and has even been reported to induce a hypometabolic state (suspended animation) in a few vertebrates. The exuberance over potential clinical applications of natural and synthetic H2S-"donating" compounds is understandable and a number of these function-targeted drugs have been developed and show clinical promise. However, the concentration of H2S in tissues and blood, as well as the intrinsic factors that affect these levels, has not been resolved, and it is imperative to address these points to distinguish between the physiological, pharmacological, and toxicological effects of this molecule. This review will provide an overview of H2S metabolism, a summary of many of its reported "physiological" actions, and it will discuss the recent development of a number of H2S-donating drugs that show clinical potential. It will also examine some of the misconceptions of H2S chemistry that have appeared in the literature and attempt to realign the definition of "physiological" H2S concentrations upon which much of this exuberance has been established. © 2011 the American Physiological Society.
Wolfer J.,Indiana University at South Bend
IEEE Global Engineering Education Conference, EDUCON | Year: 2015
To visually illustrate the impact of architecture and communication on parallel computing we created a model supercomputer in the spirit of other engineering models. Combining Raspberry Pi computers with an NVIDIA TK1 the resulting machine is distinguished by it's instructional utility, asymmetric CPU and communication channel speed, and for incorporating current trends in heterogeneous supercomputing. Running Linux, the model supports major high-performance computing software environments, including OpenMP, MPI, and NVIDIA's CUDA. The model architecture includes aspects of heterogeneous, supercomputers such as shared- and distributed-memory MIMD, and 192 CUDA core SIMD-like processors. © 2015 IEEE.
Schimmrigk R.,Indiana University at South Bend
Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics | Year: 2015
A framework of inflation is formulated based on symmetry groups and their associated automorphic functions. In this setting the inflaton multiplet takes values in a curved target space constructed from a continuous group G and a discrete subgroup Γ. The dynamics of inflationary models is essentially determined by the choice of the pair (G, Γ) and a function Φ on the group G. Automorphic inflation provides a natural structure in which the shift symmetry of large field inflation arises as one of generators of Γ. The model of j-inflation is discussed as an example of modular inflation associated with the special linear group. © 2015.
Devaraj S.,University of Notre Dame |
Vaidyanathan G.,Indiana University at South Bend |
Mishra A.N.,Georgia State University
Journal of Operations Management | Year: 2012
Despite the widespread adoption of e-procurement by firms in recent years, academic research examining the mechanisms through which e-procurement applications lead to performance has been scarce. Anecdotal evidence points to numerous situations where companies have failed to harness the potential of e-procurement. In this paper, we argue that online purchase volume and mix flexibilities facilitated by these applications play a significant role in the ability of firms to benefit from e-procurement. We examine this tenet from both an economic as well as a social perspective. We propose that increased online purchase volume flexibility as well as online purchase mix flexibility can be facilitated by two mechanisms - supplier customization as explained by transaction costs perspective, and information sharing between supply chain partners using a social exchange theoretical perspective. The increased purchase volume and mix flexibility in turn leads to better performance along the dimensions of cost, quality, and delivery. We present and test a nuanced perspective where we argue that (i) the effect of supplier customization on both purchase volume and mix flexibilities will be moderated by the frequency of transactions conducted online, and (ii) the effect of information sharing on both purchase volume and mix flexibilities will be moderated by trust in the supplier. We estimate our research model using survey data collected from 130 purchasing and procurement managers. We find strong support for our proposed research model with results indicating that purchase volume and mix flexibilities play a vital mediating role in impacting e-procurement performance. Theoretical and practical implications of the findings are discussed. © 2012 Elsevier B.V.
Gallagher J.R.,Indiana University at South Bend
Alcoholism Treatment Quarterly | Year: 2013
Drug courts offer treatment as an alternative to incarceration for criminal offenders with a history of substance abuse. This study contributes to the existing literature by using logistic regression analyses to predict graduation outcomes for participants of a drug court located in a major metropolitan area of Texas. The most predictive variables of graduating the drug court were being employed or being a student at the time of admission, having fewer positive drug tests, and being White. Implications for policy advocacy and future research are discussed, focusing specifically on the finding of racial disparities in graduation outcomes. Copyright © Taylor and Francis Group, LLC.
News Article | February 22, 2017
South Bend’s Lunkerville, the award-winning TV series that catches real people with real fish stories, is proud to once again feature Heroes On The Water (HOW), a non-profit organization dedicated to helping military veterans relax, rehabilitate, and reintegrate through kayak fishing. This season’s all new episode has series host ‘Mike D’ traveling to Lake Denmark, New Jersey, to fish with war veteran Justin Vail from the New Jersey Chapter of Heroes On The Water. The show will air Thursday, February 23 at 9 AM, and Friday, February 24 at 1 AM, 9 AM and 3 PM on World Fishing Network. The South Bend brand is excited to continue its partnership with Heroes On The Water as it directly aligns with the brand’s core message: that fishing is an experience unlike any other, in that it combines an exciting sport and a tranquil natural setting, to provide a backdrop for lifelong memories with friends and family. As Vail’s firsthand account with Heroes On The Water illustrates, it’s precisely this kind of experience that has proven to be so useful as part of a treatment regime that helps veterans and their families reconnect and transition to healthier lives. “Heroes On The Water is an incredible resource for our nation’s veterans,” explains Scott Griffith, Vice President of Marketing for South Bend. “They literally change the lives of those who have served our country, as this year’s episode dramatically illustrates. And the way they do it is through the simple experience of kayak fishing. It almost sounds far-fetched, but the truth is that this kind of fishing combines a positive and empowering physical experience with the emotional and spiritual benefits of being in a peaceful natural setting. The results speak for themselves: HOW has documented a 56% decrease in overall stress levels in participating veterans, as well as significant reductions in other combat-related symptoms like avoidance behavior and hyper-vigilance.” “It made perfect sense for South Bend’s Lunkerville to revisit Heroes On The Water again in 2017,” said series host and creator, Mike D. “Viewers loved the show we did last season — the response was overwhelming and personally, it’s always an emotional and inspiring experience fishing with these guys. HOW deserves all the recognition we can give them.” Through the remainder of 2017, check local listings for additional airings of this episode on CBS Sports Network, World Fishing Network and beginning in April, Destination America, as well as for information on the ever-expanding list of broadcast partners and regional affiliate stations, including Comcast Sports networks, Time Warner Sports channels and PBS stations. About South Bend Sporting Goods South Bend, a Big Game International brand, has devoted more than a hundred years to creating products that let families and fishing enthusiasts experience the joy of fishing, at prices they can afford. Since 1906, South Bend has been a leader in the industry and is best known for offering quality products at an exceptional value to make fishing easy and fun for today's active families and anglers of all ages and skill levels. All South Bend products are designed to reflect the singular heritage summed by the brand’s slogan: Quality Tackle Since 1906. Today, South Bend continues to offer a comprehensive line of fishing equipment and accessories that anglers and their families can trust and enjoy for many years. In 2012, South Bend entered into a multiyear partnership with “Lunkerville”, the award-winning television series that embodies the simple fun of fishing; a show where the featured guest is the expert -- not the host. Since then, the South Bend brand and “South Bend’s Lunkerville” have shared a mission to get more people involved in fishing by demonstrating how easy, fun and affordable fishing really is. South Bend™ is a Big Game International brand. For more information, please visit http://www.south-bend.com. About Heroes On The Water Heroes On The Water is a 501(c)3 non-profit, founded in 2007 to fulfill a need to provide veterans and active-duty military and their families a way to reconnect and refuel. OUR MISSION IS to help warriors relax, rehabilitate and reintegrate through kayak fishing and the outdoors. 2017 is a milestone year for HOW as we celebrate a decade of heroes healing. Learn more about us and how you can support our nation’s heroes by visiting http://heroesonthewater.org. About South Bend’s Lunkerville When Indie film director Michael de Avila hooked his passion for story telling onto his love of fishing, he spawned an award-winning reality television show, “Lunkerville”. While other fishing shows rely on fast-paced competition and expert hosts, ‘Mike D’ casts his line at everyday, recreational anglers, traveling to their secret spots, sharing their special techniques and making them the expert stars of the day. Shot with a filmmaker's eye and touch, every episode is treated as a short documentary film. In 2009, the series received a CINE Golden Eagle for documentary filmmaking; one of the most coveted awards in television. In 2012, “Lunkerville” signed a multiyear agreement with its first title sponsor, the heritage fishing brand South Bend®, a leader in affordable fishing tackle that shares Mike D’s commitment to promoting fishing as fun, accessible and important. The series, now in its 13th year of broadcast, first aired on The Sportsman Channel, where it won three consecutive years of viewer-voted awards for Favorite Fishing Show, and Favorite Fishing Show Host. Today, “South Bend’s Lunkerville” reaches over 150+ million households, broadcast on WFN in Canada and the United States; on the NBC Sports Network throughout the United States; on Comcast SportsNet Chicago, and on select PBS stations. “South Bend’s Lunkerville” is a production of Rockville Pictures Inc. For more information, please visit http://www.lunkerville.com. About Big Game International Big Game International is a leading manufacturer and designer of products that encompass all sporting goods categories. Expertise in sourcing, product development, packaging, cosmetics and marketing allow Big Game International to deliver high quality, competitively priced products and programs to our partners and customers. For more information, please visit http://www.biggameintl.com.