Digital Commons Network^™

Aerodynamic Performance Characterization Of Leading Edge Protrusions On Small Propellers, Kevin Moore, Andrew Ning

Faculty Publications

The relatively large tubercles or protruding bumps on the leading edge of the humpback whale fin create counter-rotating chordwise vortices. At high Reynolds numbers, these vortices have been shown to delay stall with minimal effect on drag. The range of Reynolds numbers that these types of vortices form is unknown, and so an investigation of the potential for an increased envelope of operation for small aircraft propellers was done. For the cases tested in this report no benefits were observed. The addition of leading edge protrusions decreased propeller performance in both efficiency and thrust. Because of the inherent restrictions on …

When Training Gets Trumped: How Dual-Task Interference Inhibits Security Training, Jeffrey L. Jenkins, Bonnie Anderson, Anthony Osborn Vance, Scott Jensen

Faculty Publications

Security training programs are an important intervention to protect users and organizations against security threats. Unfortunately, users often ignore their training and engage in poor security behaviors. We explain how dual-task interference (DTI) is a primary cause of security training disregard. DTI is a cognitive limitation wherein humans cannot perform more than one task simultaneously without experiencing a deterioration of performance. In our context, we hypothesize how prompting users to perform security behaviors during high-DTI times may derail one’s previous security training, resulting in less secure behaviors.

We test our hypotheses in an experiment that compares users’ adherence to security …

Life Satisfaction Moderates The Associations Between Motives And Excessive Social Networking Site Usage, Jin-Liang Wang, James Gaskin, Hai-Zhen Wang, Dong Liu

Faculty Publications

It has been suggested that excessive social networking sites (SNS) users might use SNS as a method of coping with their life problems and that psychosocial well-being variables might interact with users’ motives for using SNS in predicting problematic SNS use. The present research explores whether the association between motives (i.e. self-expression and passing time) and excessive SNS usage is moderated by the user’s life satisfaction. A total of 996 college students were recruited from two colleges in Chongqing China. The participants were divided into excessive and nonexcessive SNS usage groups based on their mean score from the excessive SNS …

Real-Time Hand Tremor Detection Via Mouse Cursor Movements For Improved Human-Computer Interactions: An Exploratory Study, Parker A. Williams, Jeffrey L. Jenkins, Joseph S. Valacich

Faculty Publications

Millions of people experience hand-tremors—rhythmic oscillation of the fingers, hands, or arm that cause shaking in the hand. People who experience hand tremors often experience difficulty in human computer interactions. For example, when browsing a website, people with hand tremors may have difficulty navigating or clicking on links in the website. With sever hand tremors, effective computing is difficult without assistance. Past research has developed interventions that can be automatically deployed by a website to make it more accessible to people with hand tremors. We build on this research by creating a methodology to unobtrusively detect hand tremors, allowing these …

Rethinking Fremont Chronology, James R. Allison

Faculty Publications

The dating of Fremont sites is based almost entirely on radiocarbon dates. A large number of dates exist from the region as a whole, but many of the largest Fremont sites are poorly dated. Most of the important sites excavated prior to the 1980s have at best a few dates, and many of the dates that do exist are on charcoal from structural wood. In some cases the only available dates are clearly centuries too early for the sites and structures they purport to date. In addition to problems with the data, some reports and publications about Fremont archaeology make …

Early Mimbres Households: Exploring The Late Pithouse Period (550–1000 Ad) At The Florida Mountain Site, Michael T. Searcy, Bernard Schriever, Matthew Taliaferro

Faculty Publications

Many studies have explored the household to understand social organization, production, and other dynamics of societies throughout the world. In this work, the approach outlined by Richard Wilk and colleagues is used to investigate households at the Florida Mountain Site, an intermittently occupied Late Pithouse period (550–1000 AD) residential site in the Mimbres Mogollon area of Southwestern New Mexico. Drawing on the similarities of this intermittent residential site to contemporaneous pitstructure sites in the Mimbres area, we suggest that one or more household units occupied the site. Our analysis also supports previous inferences that Mimbres households were integrated into more …

No Association Between Current Depression And Latent Toxoplasmosis In Adults, Bruce L. Brown, Shawn D. Gale, Andrew N. Berrett, Lance D. Erickson, Dawson W. Hedges

Faculty Publications

Changes in behaviour and cognition have been associated with latent infection from the apicomplexan protozoan Toxoplasma gondii (Nicolle et Manceaux, 1908) in both animal and human studies. Further, neuropsychiatric disorders such as schizophrenia have also been associated with latent toxoplasmosis. Previously, we found no association between T. gondii immunoglobulin G antibody (IgG) seropositivity and depression in human adults between the ages of 20 and 39 years (n = 1 846) in a sample representative of the United States collected by the Centers for Disease Control as part of a National Health and Nutrition Examination Survey (NHANES) from three datasets collected …

For Love Or Money? The Economic Consequences Of Delayed Marriage, Jason S. Carroll

Faculty Publications

It has been well documented that over the last few decades we have seen a substantial increase in the median age of marriage in the United States. In fact, we are currently at all-time historic highs in these trends. According to the Current Population Survey from the U.S. Census, the median age of marriage right now is nearly 29 years of age for men and 27 years of age for women. Given the trajectory of this trend over the last several years, we are quickly approaching a time in our culture where half of marriages will occur for individuals after …

Contributors

The Bridge

No abstract provided.

Blended Learning Citation Patterns And Publication Networks Across Seven Worldwide Regions, Kristian J. Spring, Charles R. Graham

Faculty Publications

The field of international blended learning (BL) is primed to benefit from stronger communication and collaboration. Collaboration is currently limited, and regions vary greatly in terms of citations. However, BL is growing worldwide and each region is an important part of the community. The goal of this research is to explore where the most impactful conversations about BL worldwide are occurring and how, if at all, are they connected to one another in terms of citations and publications. We present here the most cited BL articles from each region, the journals that publish these articles, and citation and publication patterns …

Comparing The Publication Process In Accounting, Economics, Finance, Management, Marketing, Psychology, And The Natural Sciences, David A. Wood

Faculty Publications

I present two types of data about the publication and review process in the accounting, economics, finance, management, marketing, psychology, and natural science disciplines. First, I collect all articles published in 2012 in top tier journals of these disciplines and compare the articles based on word counts, figures and tables included in each article, the time it took to be published, citations, the number of co-authors, and submission fees. I then survey academics in each discipline. Survey questions were designed to evaluate overall perceptions of the review process; changes in the review process in the last 5 years; opinions about …

Dodging Marshmallows: Simulations To Teach Ethics, Justin Weidman, Dawan Coombs

Faculty Publications

Students had just participated in an experiential learning exercise where they played dodgeball using marshmallows. But the unique context of the game introduced ethical dilemmas that integrated ethics education into a technical education classroom setting.

Research shows that “Engineering curriculum and activities at the K-12 level should be designed to expose students to [ethical considerations inherent in the practice of engineering], and as a result students should be aware of the importance of these issues in the field of engineering” (Moore, Glancy, Tank, Kersten, Smith, & Stohlmann, 2014). But how do STEM teachers teach students to think about ethical issues …

Do Female Elk Select Hiding Cover For Their Calves At Birth Sites?, Dillon T. Fogarty, Chadwick P. Lehman

Western North American Naturalist

In light of local population declines and poor calf survival, we investigated visual obstruction as potential elk (Cervus elaphus) calf hiding cover at birth sites. We hypothesized that female elk would use hiding cover (i.e., visual obstruction) in order to conceal their calves at the birth site and reduce vulnerability to predation. Selection of hiding cover has been well documented at calf bedding sites subsequent to parturition; however, because of variably reported results from prior studies, it is unclear whether hiding cover is selected at the immediate birth site. We estimated visual obstruction of hiding cover, measured understory …

A Comparison Of Sign Searches, Live-Trapping, And Camera-Trapping For Detection Of American Badgers (Taxidea Taxus) In The Chihuahuan Desert, Robert L. Harrison

Western North American Naturalist

In communities where they occur, American badgers (Taxidea taxus) play important ecological, economic, and conservation roles. Central to understanding of badger ecology and management are estimates of badger population status. However, few studies have compared methods of detecting badgers for population surveys. I compared searches for burrows and diggings, live-trapping, and the use of automatic cameras at scent lures, bait stations, and anthropogenic permanent and temporary wildlife water sources in the Chihuahuan Desert of southern New Mexico. Searches for confirmed badger burrows and diggings yielded 0.14–0.88 detections per kilometer of transect. Badgers were trapped in 1.6% of trap-weeks. …

Phenetic Analyses And Revised Classification Of The Ptelea Trifoliata Complex (Rutaceae), Erin Skornia, Muxi Yang, Wendy L. Applequist

Western North American Naturalist

The current classification of Ptelea divides the widespread and highly variable Ptelea trifoliata L. into 5 subspecies and 11 varieties, while additionally terming many specimens “intermediate.” Although there are visually observable differences among regional variants, principal component analyses of quantitative characters failed to separate subspecies or to even incompletely separate most varieties within subspecies. Some recognized subgroups are also not well distinguished by discontinuous qualitative characters. Where multiple varieties appear to be part of a single continuum of variation or are extremely similar, it is suggested that a reduction in the number of infraspecific taxa would improve the utility of …

Maternity Roost Selection By Fringed Myotis In Colorado, Mark A. Hayes, Rick A. Adams

Western North American Naturalist

Fringed myotis (Myotis thysanodes) is a bat species of conservation concern in western North America that may be impacted by increased recreational activity near roost sites, changes in water resource availability caused by increased urban and agricultural water use, and anthropogenic climate change. Our purpose was to describe and model maternity roost use by fringed myotis in Colorado. We compared differences between roosts occupied by maternal fringed myotis and randomly selected potential roosting locations that were not known to be occupied by this species during the maternity period. We evaluated the strength of evidence for competing hypotheses on …

First Record Of Jaguar (Panthera Onca) From The State Of Hidalgo, México, Melany Aguilar-López, Josefina Ramos-Frías, Alberto E. Rojas-Martínez, Cristian Cornejo-Latorre

Western North American Naturalist

We documented the first record of jaguar (Panthera onca) in the state of Hidalgo, México. With this record, the gap in the distribution of jaguar between San Luis Potosí and northwestern Puebla is reduced. In July 2013, we found 2 tracks on a trail in a pine-oak forest, and in October, we photographed a jaguar in an oak forest. Both sites are located within the Parque Nacional Los Mármoles in Sierra Gorda of Hidalgo. These records represent the first evidence of the presence of jaguar in Hidalgo, which is among the few states where all 6 species of …

Life History, Burrowing Behavior, And Distribution Of Neohermes Filicornis (Megaloptera: Corydalidae), A Long-Lived Aquatic Insect In Intermittent Streams, Matthew R. Cover, Jeong Ho Seo, Vincent H. Resh

Western North American Naturalist

Several species of fishflies (Megaloptera: Corydalidae: Chauliodinae) have been reported from intermittent streams in western North America, but the life histories and distributions of these species are poorly understood. We studied the life history ofNeohermes filicornis (Banks 1903) for 2 years in Donner Creek (Contra Costa County, California), a small intermittent stream that flows for 5–7 months per year. Neohermes filicornis had a 3–4-year life span and larval growth was asynchronous. Analysis of gut contents showed that larvae were generalist predators of aquatic insect larvae including Diptera, Ephemeroptera, and Plecoptera. Final instars dug pupal chambers in the streambed and …

Front Matter, Vol. 75 No. 4

Western North American Naturalist

No abstract provided.

Using Detection Dogs And Rspf Models To Assess Habitat Suitability For Bears In Greater Yellowstone, Jon P. Beckmann, Lisette P. Waits, Aimee Hurt, Alice Whitelaw, Scott Bergen

Western North American Naturalist

In the northern U.S. Rockies, including the Greater Yellowstone Ecosystem (GYE), connectivity is a concern because large carnivores have difficulties dispersing successfully between protected areas. One area of high conservation value because of its importance for connecting the GYE to wilderness areas of central Idaho is the Centennial Mountains and surrounding valleys (2500 km2) along the Idaho–Montana border just west of Yellowstone National Park. The current expansion of grizzly bears (Ursus arctos) and other large carnivore populations outside protected areas of Yellowstone National Park and Grand Teton National Park has placed a greater emphasis on potential linkage zones …

Facing A Changing World: Thermal Physiology Of American Pikas (Ochotona Princeps), Hans W. Otto, James A. Wilson, Erik A. Beever

Western North American Naturalist

American pikas (Ochotona princeps) are of concern with respect to warming montane temperatures; however, little information exists regarding their physiological ability to adapt to warming temperatures. Previous studies have shown that pikas have high metabolism and low thermal conductance, which allow survival during cold winters. It has been hypothesized that these characteristics may be detrimental, given the recent warming trends observed in montane ecosystems. We examined resting metabolic rate, surface activity, and den and ambient temperatures (Ta) of pikas in late summer (August 2011 and 2012) at 2 locations in the Rocky Mountains. Resting metabolic rate was calculated …

Production And Nutrient Content Of Two Shrub Species Related To Fire In Central Idaho, James M. Peek

Western North American Naturalist

Nutrient content and weight of current year’s growth of Cercocarpus ledifolius Nuttall and Physocarpus malvaceus (Greene) Kuntze in central Idaho were obtained during early July in the years 1987–2007. The purpose of this work was to determine whether there was significant variation between years and whether mean monthly temperatures and total monthly precipitation could predict the variation. A wildfire in August 2000 causedP. malvaceus to vigorously resprout. Significant differences between years occurred for all nutrients for both species. October temperatures best predicted weight of current year’s growth in C. ledifolius, whereas prediction equations for nutrients involved spring temperatures and …

Black-Tailed And White-Tailed Jackrabbits In The American West: History, Ecology, Ecological Significance, And Survey Methods, Matthew T. Simes, Kathleen M. Longshore, Kenneth E. Nussear, Greg L. Beatty, David E. Brown, Todd C. Esque

Western North American Naturalist

Across the western United States, Leporidae are the most important prey item in the diet of Golden Eagles (Aquila chrysaetos). Leporids inhabiting the western United States include black-tailed (Lepus californicus) and white-tailed jackrabbits (Lepus townsendii) and various species of cottontail rabbit (Sylvilagus spp.). Jackrabbits (Lepus spp.) are particularly important components of the ecological and economic landscape of western North America because their abundance influences the reproductive success and population trends of predators such as coyotes (Canis latrans), bobcats (Lynx rufus), and a number of raptor species. …

A Herpetological Inventory Of Naval Air Station Fallon, Churchill County, Nevada, Jonathan P. Rose, Oliver J. Miano, Gary R. Cottle, Robert E. Lovich, Robert L. Palmer, Brian D. Todd

Western North American Naturalist

Much of the western United States is managed by state and federal agencies for multiple uses, including recreation, grazing, extraction, and defense. Biological inventories are integral to proper management and conservation of biodiversity on these lands. We surveyed for amphibians and reptiles occurring on Naval Air Station Fallon (NAS Fallon), Nevada, USA, using a variety of methods. We documented the presence of a majority of the amphibian and reptile species native to this region of the Great Basin. We found 5 species on NAS Fallon that are listed as Species of Conservation Priority by the Nevada Department of Wildlife: the …

End Matter, Vol. 75 No. 4

Western North American Naturalist

No abstract provided.

The Blind Can See: Revisiting Disability In Jane Eyre, Gina Schneck

Criterion: A Journal of Literary Criticism

No abstract provided.

Specialized Replication Operons Control Rhizobial Plasmid Copy Number In Developing Symbiotic Cells, Clarice Lorraine Perry

Theses and Dissertations

The rhizobium – legume symbiosis is a complex process that involves genetic cooperation from both bacteria and plants. Previously, our lab described naturally occurring accessory plasmids in rhizobia that inhibit this cooperation. A transposon mutagenesis was performed on the plasmids to detect the genetic factor that blocked nitrogen fixation. Several of the plasmids were found to possess a replication operon that when disrupted by transposon insertion, restored symbiotic function. This study describes an in-depth investigation into one of those plasmids, pHRC377, and into its replication operon. The operon, which we have called repA2C2, comes from the repABC family of …

Control Of Alternaria Solani Resistance To Boscalid, Fluopyram, And Chlorothalonil, Andrew K. Hollingshead

Theses and Dissertations

Alternaria solani, cause of early blight, threatens potato yields. Fungicide resistance has made control of early blight difficult and there are concerns that in-season fungicide use results in resistance to boscalid, fluopyram, and chlorothalonil. Concern of high levels of resistance to boscalid a group 7 fungicide may confer cross-resistance to fungicides of the same group such as fluopyram. From 2014 to 2015, A. solani isolates were collected from field plots treated with boscalid, fluopyram, and chlorothalonil to test resistance levels. Isolates were determined resistant if EC50 values were higher than 5 µg ml-1. Boscalid and chlorothalonil mean EC50 values decreased …

The Role Of Stress In Hypersexual Behavior, Randy Gilliland

Theses and Dissertations

The proposed diagnostic criteria for Hypersexual Disorder included "[r]epetitively engaging in sexual fantasies, urges, or behaviors in response to stressful life events" (Kafka, 2010, p.279) as a symptom, although no data demonstrates a causal relationship between stress and hypersexual behavior. We sought to confirm previous findings while furthering the field's understanding of this relationship by being the first study to assess stress and hypersexual behavior across multiple time points. Specifically, we sought to test three hypotheses within a sample of men seeking treatment for hypersexual behavior: 1) hypersexual individuals report higher stress levels than published norm samples; 2) stress predicts …

What A Dream Was Here: An Ontological Approach To Love And Magic In Shakespeare’S A Midsummer Night’S Dream, Brittany May Rebarchik

Theses and Dissertations

This paper takes Heidegger’s notion of world disclosure and uses it for extended thematic analyses of A Midsummer Night’s Dream. In contrast to the majority of Shakespeare critics who treat Shakespeare’s use of magic as an epistemological issue, I argue that the main action of the play develops through an inherent contradiction between the magical and non-magical ontological states of the characters and the love that results. Borrowing from German philosopher Martin Heidegger, I demonstrate magic’s role as a catalyst in giving certain kinds of love a “shift of existence.” I show that the characters come more fully into being, …