Digital Commons Network^™

Utilizing Device Slack For Energy-Efficient I/O Device Scheduling In Hard Real-Time Systems With Non-Preemptible Resources, Hui Cheng, Steve Goddard

School of Computing: Technical Reports

The challenge in conserving energy in embedded real-time systems is to reduce power consumption while preserving temporal correctness. Much research has focused on power conservation for the processor, while power conservation for I/O devices has received little attention. In this paper, we analyze the problem of online energy-aware I/O scheduling for hard real-time systems based on the preemptive periodic task model with non-preemptible shared resources. We extend the concept of device slack proposed in [2] to support non-preemptible shared resources; and propose an online energy-aware I/O scheduling algorithm: Energy-efficient Device Scheduling with Non-preemptible Resources (EEDS NR). The EEDS NR algorithm …

On Finding Consecutive Test Vectors In A Random Sequence For Energy-Aware Bist Design, Sheng Zhang, Sharad C. Seth, Bhargab B. Bhattacharya

School of Computing: Conference and Workshop Papers

During pseudorandom testing, a significant amount of energy and test application time is wasted for generating and for applying “useless” test vectors that do not contribute to fault dropping. For low-power testing, modification logic/ROM may be used to skip the LFSR states that generate useless test patterns. The overhead of extra logic increases rapidly with the number of such jumps. Since identification of useless patterns strongly depends on the order in which incremental fault simulation is performed, an elegant solution to this problem would be to find a minimum set of segments in the LFSR sequence, where each segment corresponds …

Functionality Behavior Of Raw And Extruded Corn Starch Mixtures, Serap Ozcan, David S. Jackson

Department of Food Science and Technology: Faculty Publications

Relationships between the structural properties of raw. and extruded com starches and their functionalities were investigated using mixtures of these starch types. Extruded starch had higher water absorption and water solubility indices, and produced lower RVA viscosity profiles when compared with raw starch. It also had no differential scanning calorimetry (DSC) endotherm. Gel cohesiveness and adhesiveness of both starch types were similar, while extruded starch gels were softer. Extruded starch produced lower Rapid Visco Analyser (RVA) viscosity profiles than raw starch due to starch degradation during extrusion. The raw and extruded starch components bad negative interaction coefficients, thus RVA viscosity …

Development Of Laboratory Techniques To Mimic Industrial-Scale Nixtamalization, Roxana Yglesias, Anne M. Parkhurst, David S. Jackson

Department of Food Science and Technology: Faculty Publications

A laboratory nixtamalization process was developed to imitate larger scale cooking/steeping conditions. Corn (45 kg) was cooked in a pilot plant gas-fired cook/steep tank and temperature was monitored every 30 sec. Cooling and heating rates were mimicked in the laboratory using a digital temperature programmable hot plate that adjusted grain-waterlime temperature changes at a specified rate. A Response Surface Central Composite Design was used to model pasting and thermal properties of nixtamal and masa as a function of cooking temperature (86-96°C), cooking time (20-40 min), and steeping time (3-11.77 hr). Nixtamal and masa moisture. dry matter loss, nixtamal and masa …

Ctla-4 Signaling Regulates The Intensity Of Hypersensitivity Responses To Food Antigens, But Is Not Decisive In The Induction Of Sensitization, Femke Van Wijk, Sanne Hoeks, Stefan Nierkens, Stef J. Koppelman, Peter Van Kooten, Louis Boon, Leon M.J. Knippels, Raymond Pieters

Department of Food Science and Technology: Faculty Publications

Although food allergy has emerged as a major health problem, the mechanisms that are decisive in the development of sensitization to dietary Ag remain largely unknown. CTLA-4 signaling negatively regulates immune activation, and may play a crucial role in preventing induction and/or progression of sensitization to food Ag. To elucidate the role of CTLA-4 signaling in responses to food allergens, a murine model of peanut allergy was used. During oral exposure to peanut protein extract (PPE) together with the mucosal adjuvant cholera toxin (CT), which induces peanut allergy, CTLA-4 ligation was prevented using a CTLA-4 mAb. Additionally, the effect of …

Etiology Of Oral Disease In View Of Microbial Complexity, Anne C. R. Tanner, Jacques Izard

Department of Food Science and Technology: Faculty Publications

The number of different microorganisms recognized in the oral cavity using molecular methods has more than doubled compared with the number isolated using cultural techniques. This finding necessitates a reevaluation of which species may be pathogens in dental infections. Molecular methods used to determine microbial diversity include broad range target Polymerase Chain Reaction with ‘universal primers,’ and cloning amplicons or denaturing gradient gel electrophoresis to separate DNA fragments before sequencing. These molecular methods have clarified and expanded the taxonomy of oral microbial species. Discrepancies between comprehensive molecular and cultural methods suggest that neither method alone can adequately evaluate associations of …

Wen Hua Ding Wei Yu Gao Zhong Sheng Yin Jiu Xing Wei Zhi Jian De Guan Xi [Cultural Orientation And Chinese Adolescent Drinking], Jianping Xue, Ian Newman, Duane F. Shell, Xiaoyi Fang

Department of Educational Psychology: Faculty Publications

Objective: To explore a relationship between culture and alcohol drinking
Methods: Questionnaires on western cultural influence and drinking practices were administered to 1,091 tenth, eleventh, and twelfth grade students in five senior high schools in Beijing in January 2002.
Results: The mean cultural orientation scores for the three drinking groups were statistically different, F = 30.64, p=.03. A post hoc test indicated that significant differences in cultural orientation existed between non-drinkers (X=2.98, SD=.28, N=388) and occasional drinkers (X=3.08, SD=.27, N=418) and between non-drinkers and regular drinkers (X =3.13, SD=.26, N=149)
Conclusions: The more westem-oriented the students were the more likely …

Wonderwise 4-H: Following In The Footsteps Of Women Scientists, A. N. Spiegel, S. K. Rockwell, D. S. Acklie, K. French, J. Diamond

Department of Educational Psychology: Faculty Publications

Wonderwise 4-H: Women in Science introduces youth to contemporary female scientists in their labs, out in the field, and with their families through nine interactive multimedia kits. Youth learn about the scientist’s occupation and participate in hands-on science activities similar to the actual work of a female scientist role model. Using role models was effective in improving youths’ attitudes about science through engaging activities and realistic videos. A web survey of 150 adult youth leaders showed Wonderwise 4-H brings “real science” into youths’ lives by (a) engaging them in actual scientific activities, (b) increasing their understanding of what science is, …

Colossal Dielectric And Electromechanical Responses In Self Assembled Polymeric Nanocomposites, Cheng Huang, Q. M. Zhang, Jiang Yu Li, Manese Rabeony

Department of Engineering Mechanics: Faculty Publications

An electroactive polymer nanocomposite, in which high dielectric constant copper phthalocyanine oligomer (o-CuPc) nanoparticles are incorporated into the block polyurethane (PU) matrix by the combination of “top down” and “bottom up” approaches, was realized. Such an approach enables the nanocomposite to exhibit colossal dielectric and electromechanical responses with very low volume fraction of the high dielectric constant o-CuPc nanofillers (~3.5%) in the composite. In contrast, a simple blend of o-CuPc and PU composite with much higher o-CuPc content (~16% of o-CuPc) shows much lower dielectric and electromechanical responses.

A Model For Predicting The Evolution Of Damage In Viscoelastic Particle-Reinforced Composites, G. D. Seidel, D. H. Allen, K. L. E. Helms, S. E. Groves

Department of Engineering Mechanics: Faculty Publications

A viscoelastic cohesive zone model is employed within the framework of a finite element code to analyze a two-phase viscoelastic particle-reinforced composite material consisting of a relatively stiff aggregate embedded in a copolymer binder. The composite of interest, LX17, is noted to have a very large aggregate volume fraction and as such, aggregate grain boundaries were generated within finite element meshes along which viscoelastic cohesive zones have been embedded to model the binder. It has been observed experimentally that the majority of damage in LX17 occurs within the binder, and thus, a damage evolution law has been applied to the …

Influence Of Composition And Heat-Treatment On The Charge Transport Properties Of Poly(3-Hexylthiophene) And [6,6]-Phenyl C61-Butyric Acid Methyl Ester Blends, Jinsong Huang, Gang Li, Yang Yang

Department of Mechanical and Materials Engineering: Faculty Publications

Poly(3-hexylthiophene) (P3HT) and [6,6]-phenyl C₆₁-butyric acid methyl ester (PCBM) blends have been demonstrated to form highly efficient polymer photovoltaic devices. In this letter, the time-of-flight technique is used to investigate the influence of composition and heat treatment on charge transport properties of P3HT and PCBM blends. The transport of electrons and holes both display a transition from dispersive to nondispersive and return to dispersive again as the percentage of PCBM increases. A balanced mobility of both electron and hole is obtained at a composition of 1:1 weight ratio, and it is nearly independent of the electrical field in …

La Novela Rosa De Ambientación Vasca E Ideología Franquista Durante La Guerra Civil Española (The Basque Romance Novel And Its Francoist Ideology During The Spanish Civil War), Iker González-Allende

Spanish Language and Literature Papers

Un estudio de la producción de la novela rosa publicada durante la guerra civil con una ambientación vasca. Se analizan Madrina de guerra (s.a.), de Rosa de Arámburu; La enfermera de Ondárroa (1938), de Jorge Villarín; y ¡Milagrosa! (s.a.), de Fernando de Ayala. El objetivo consiste en demostrar la conjunción en estas obras del elemento rosa o sentimental con el ideológico de la España de Franco, exponiéndose los procedimientos que utilizan estos autores para fagocitar la identidad vasca dentro de la española.

Espainiako gerran argitaratu zen euskal giroan kokaturiko eleberri arrosaren produkzioa da azterlan honen gaia. Rosa de Arámbururen Madrina …

Plains Harvest Mouse In North Dakota, Robert W. Seabloom, Terry L. Shaffer

United States Geological Survey, Northern Prairie Wildlife Research Center: Publications

The plains harvest mouse (Reithrodontomys montanus) is primarily a species of the central and southern plains of North America (Hall 1981, Wilkins 1986). Its published distribution extends from northwestern South Dakota south to the Mexican states of Chihuahua, Sonora, and Durango. To the west, it occurs in eastern Wyoming, Colorado, New Mexico, and southeastern Arizona, while its eastern limits are in eastern Nebraska, Kansas, Oklahoma, Texas, and southwestern Missouri. In South Dakota, R. montanus has been reported as far north as the vicinity of Ludlow, Harding County, which is the most northerly published location recorded for the species …

Variability In Vegetation Effects On Density And Nesting Success Of Grassland Birds, Maiken Winter, Douglas H. Johnson, Jill A. Shaffer

United States Geological Survey, Northern Prairie Wildlife Research Center: Publications

The structure of vegetation in grassland systems, unlike that in forest systems, varies dramatically among years on the same sites, and among regions with similar vegetation. The role of this variation in vegetation structure on bird density and nesting success of grassland birds is poorly understood, primarily because few studies have included sufficiently large temporal and spatial scales to capture the variation in vegetation structure, bird density, or nesting success. To date, no large-scale study on grassland birds has been conducted to investigate whether grassland bird density and nesting success respond similarly to changes in vegetation structure. However, reliable management …

Biotic Interactions As Determinants Of Ecosystem Structure In Prairie Wetlands: An Example Using Fish, Mark A. Hanson, Kyle D. Zimmer, Malcolm G. Butler, Brian A. Tangen, Brian R. Herwig, Ned H. Euliss Jr.

United States Geological Survey, Northern Prairie Wildlife Research Center: Publications

Wetlands are abundant throughout the prairie pothole region (PPR), an area comprising over 700,000 km² in central North America. Prairie wetland communities are strongly influenced by regional physiography and climate, resulting in extreme spatial and temporal variability relative to other aquatic ecosystems. Given the strong influence of abiotic factors, PPR wetland communities have been viewed traditionally in the context of their responses to chemical and physical features of landscape and climate. Although useful, this physical-chemical paradigm may fail to account for ecosystem variability due to biotic influences, particularly those associated with presence of fish. Spatial and temporal variability in …

Decline And Recovery Of A High Arctic Wolf-Prey System, L. David Mech

United States Geological Survey, Northern Prairie Wildlife Research Center: Publications

A long-existing system of wolves (Canis lupus), muskoxen (Ovibos moschatus), and arctic hares (Lepus arcticus) in a 2600 km² area of Canada’s High Arctic (80° N latitude) began collapsing in 1997 because of unusual adverse summer weather but recovered to a level at which all three species were reproducing by 2004. Recovery of wolf presence and reproduction appeared to be more dependent on muskox increase than on hare increase.

Un vieux système biologique composé de loups (Canis lupus), de boeufs musqués (Ovibos moschatus) et de lièvres arctiques (Lepus …

Bears Remain Top Summer Predators, Shannon M. Barber, L. David Mech, P. J. White

United States Geological Survey, Northern Prairie Wildlife Research Center: Publications

In the ten years since wolves (Canis lupus) were restored to Yellowstone National Park (YNP), elk (Cervus elaphus) numbers have substantially decreased. The northern range elk herd is the largest elk herd in Yellowstone, and constitutes the majority of the park’s elk population. During 1994–2005, early winter counts of northern Yellowstone elk decreased from 19,045 to 9,545. Also, during winters 2000–2004, calf:cow ratios declined from 29:100 to 12:100, and were among the lowest recorded during the past several decades. Though many factors (e.g., predation, hunting, and drought) likely contributed to this decreasing abundance and low recruitment, …

Seasonal Leaf Dynamics Across A Tree Density Gradient In A Brazilian Savanna, William A. Hoffman, Edson Rangel Da Silva Jr., Gustavo C. Machado, Sandra J. Bucci, Fabian G. Scholz, Guillermo Goldstein, Frederick C. Meinzer

United States Department of Agriculture, Forest Service / University of Nebraska-Lincoln: Faculty Publications

Interactions between trees and grasses that influence leaf area index (LAI) have important consequences for savanna ecosystem processes through their controls on water, carbon, and energy fluxes as well as fire regimes. We measured LAI, of the groundlayer (herbaceous and woody plants <1-m tall) and shrub and tree layer (woody plants >1-m tall), in the Brazilian cerrado over a range of tree densities from open shrub savanna to closed woodland through the annual cycle. During the dry season, soil water potential was strongly and positively correlated with grass LAI, and less strongly with tree and shrub LAI. By the end of the dry season, LAI of grasses, groundlayer dicots …

Seasonal Migration And Home Ranges Of Female Elk In The Black Hills Of South Dakota And Wyoming, Lakhdar Benkobi, Mark A. Rumble, Cynthia H. Stubblefield, R. Scott Gamo, Joshua J. Millspaugh

United States Department of Agriculture, Forest Service / University of Nebraska-Lincoln: Faculty Publications

Understanding the movement and dispersion patterns of elk (Cervus elaphus) on public lands and the underlying factors that affect each will facilitate elk management and help resolve conflicts between management that benefit elk and other uses of land resources. Consequently, there is a need to identify and examine the movement and dispersion patterns of elk in the Black Hills of South Dakota and Wyoming. Our study quantified seasonal movements, determined home ranges of female elk in two areas of the Black Hills, and examined underlying factors associated with each. Elk in the northern area did not demonstrate seasonal …

Science Priorities For Reducing The Threat Of Invasive Species To Sustainable Forestry, Elizabeth A. Chornesky, Ann M. Bartuska, Gregory H. Aplet, Kerry O. Britton, Jane Cummings-Carlson, Frank W. Davis, Jessica Eskow, Doria R. Gordon, Kurt W. Gottschalk, Robert A. Haack, Andrew J. Hansen, Richard N. Mack, Frank J. Rahel, Margaret A. Shannon, Lisa A. Wainger, T. Bently Wigley

United States Department of Agriculture, Forest Service / University of Nebraska-Lincoln: Faculty Publications

Invasive species pose a major, yet poorly addressed, threat to sustainable forestry. Here we set forth an interdisciplinary science strategy of research, development, and applications to reduce this threat. To spur action by public and private entities that too often are slow, reluctant, or unable to act, we recommend (a) better integrating invasive species into sustainable forestry frameworks such as the Montréal Process and forest certification programs; (b) developing improved cost estimates to inform choices about international trade and pest suppression efforts; and (c) building distributed information systems that deliver information on risks, identification, and response strategies. To enhance the …

A Retrospective Analysis Of Known And Potential Risks Associated With Exotic Toadflax-Feeding Insects, Sharlene E. Sing, Robert K.D. Peterson, David K. Weaver, Richard W. Hansen, George P. Markin

United States Department of Agriculture, Forest Service / University of Nebraska-Lincoln: Faculty Publications

To date, eight exotic toadflax-feeding insect species have been accidentally or intentionally introduced to North America. Reports on their establishment and impact have been recorded for more than 60 years. Environmental risks linked to biological control of toadflax were identified in terms of host resources and undesirable impacts on the target species through the critical review of this record. Data gaps revealed during this retrospective analysis are addressed through suggestions for future research and associated experimental methodologies. Known and potential impacts of toadflax-feeding insects on both invasive toadflax and non-target species are examined. Recent programmatic demands for demonstrated agent efficacy …

Environmental Quality Incentives Program Contributions To Fish And Wildlife Conservation, Mark W. Berkland, Charles A. Rewa

United States Department of Agriculture, Forest Service / University of Nebraska-Lincoln: Faculty Publications

The Environmental Quality Incentives Program (EQIP) is a voluntary program whereby the U.S. Department of Agriculture provides technical and financial assistance to active farmers and ranchers to address natural resource concerns such as soil conservation, water quality and quantity, nutrient management, and fish and wildlife habitat. The Natural Resources Conservation Service (NRCS) is working with these landowners to maximize the environmental benefits gained for the expenditures made in the program. Funding has expanded significantly under the 2002 Farm Bill, with the amount of annual funding authorized reaching $1.3 billion by fiscal year 2007. The EQIP has been used to implement …

Fish And Wildlife Benefits Of The Wildlife Habitat Incentives Program, Randall L. Gray, Sally J. Benjamin, Charles A. Rewa

United States Department of Agriculture, Forest Service / University of Nebraska-Lincoln: Faculty Publications

Th e Wildlife Habitat Incentives Program (WHIP) is a voluntary program that encourages the establishment and enhancement of a wide variety of fish and wildlife habitats of national, state, tribal, or local significance. Through voluntary agreements, the Natural Resources Conservation Service (NRCS) provides financial and technical assistance to participants who installed habitat restoration and management practices. Since 1998, nearly $150 million has been dedicated to the program and over 2.8 million acres involving over 18,000 contracts have been enrolled. A wide range of habitat-enhancement actions are cost-shared through the program, affecting hundreds of target and non-target species. While few quantitative …

Wildlife Benefi Ts Of The Wetlands Reserve Program, Charles A. Rewa

United States Department of Agriculture, Forest Service / University of Nebraska-Lincoln: Faculty Publications

Since its initial authorization in 1990, more than 1.6 million acres of primarily drained or degraded wetlands on agricultural lands have been enrolled in the U.S. Department of Agriculture’s (USDA) Wetlands Reserve Program (WRP). The Natural Resources Conservation Service (NRCS) and its partners are working with landowners to restore these lands to ecologically productive wetland and upland buffer habitats. Numerous studies have documented the value of restored and created wetlands to fish and wildlife resources. However, few objective studies have been completed that document fish and wildlife response to wetlands enrolled in and restored through WRP. Preliminary results of some …

Biology And Biological Control Of Knapweed, Linda M. Wilson, Carol Bell Randall

United States Department of Agriculture, Forest Service / University of Nebraska-Lincoln: Faculty Publications

The knapweeds comprise a diverse complex of species that predominantly infest rangelands in the western United States and Canada. This manual considers the biological control of six species of knapweeds: 1) spotted knapweed, 2) diffuse knapweed, 3) squarrose knapweed, 4) meadow knapweed, 5) black knapweed, and 6) brown knapweed. Spotted knapweed, Centaurea stoebe, is perhaps the most widespread species, followed in abundance by diffuse knapweed, C. diffusa. A third species, squarrose knapweed, C. virgata var. squarrosa, has a more limited distribution in the West. Three less widespread species, meadow (C. pratensis), brown (C. jacea …

Estimating Combustion Of Large Downed Woody Debris From Residual White Ash, Alistair M.S. Smith, Andrew T. Hudak

United States Department of Agriculture, Forest Service / University of Nebraska-Lincoln: Faculty Publications

The production of residual white ash patches within wildfires represents near-complete combustion of the available fuel and releases a considerable quantity of gases to the atmosphere. These patches are generally produced from combustion of large downed woody debris (LDWD) such as fallen trees and snags. However, LDWD are generally ignored in calculations of fuel combusted within environments where surface fires dominate (e.g. southern African savannas). To assess the potential of fractional white ash cover as a remotely sensed measure of LDWD combustion, both the proportion of the surface covered by white ash and the combustion completeness required to produce white …

Nf-Y Behaves As A Bifunctional Transcription Factor That Can Stimulate Or Repress The Fgf-4 Promoter In An Enhancer-Dependent Manner, Cory T. Bernadt, Tamara Nowling, Matthew S. Wiebe, Angie Rizzino

Nebraska Center for Virology: Faculty Publications

NF-Y is a bifunctional transcription factor capable of activating or repressing transcription. NF-Y specifically recognizes CCAAT box motifs present in many eukaryotic promoters. The mechanisms involved in regulating its activity are poorly understood. Previous studies have shown that the FGF-4 promoter is regulated positively by its CCAAT box and NF-Y in embryonal carcinoma (EC) cells where the distal enhancer of the FGF-4 gene is active. Here, we demonstrate that the CCAAT box functions as a negative cis-regulatory element when cis-regulatory elements of the FGF-4 enhancer are disrupted, or after EC cells differentiate and the FGF-4 enhancer is inactivated. …

Replication And Encapsidation Of Papillomaviruses In Saccharomyces Cerevisiae, Peter C. Angeletti

Nebraska Center for Virology: Faculty Publications

Improvements in methodologies to recapitulate and study particular biological functions of the

papillomavirus life cycle have led to great advances in our knowledge of these viruses. Described in

this chapter are techniques that allow low-copy and high-copy replication of full-length human

papillomavirus (HPV) genomes, as well as assembly of virus-like particles, in Saccharomyces

cerevisiae (yeast). This system has several distinct advantages that make it an attractive complement

to the well-established raft-culturing system. First, yeast are inexpensive, rapid, and simple to culture

in the lab. Second, they provide an ever-widening array of genetic tools to analyze HPV functions

—most recently notable, …

Antigenicity And Immunogenicity Of A Synthetic Human Immunodeficiency Virus Type 1 Group M Consensus Envelope Glycoprotein, Feng Gao, Eric A. Weaver, Zhongjing Lu, Yingying Li, Hua-Xin Liao, Benjiang Ma, S. Munir Alam, Richard M. Scearce, Laura L. Sutherland, Jae-Sung Yu, Julie M. Decker, George M. Shaw, David C. Montefiori, Bette T. Korber, Beatrice H. Hahn, Barton F. Haynes

Nebraska Center for Virology: Faculty Publications

Genetic variation of human immunodeficiency virus (HIV-1) represents a major obstacle for AIDS vaccine development. To decrease the genetic distances between candidate immunogens and field virus strains, we have designed and synthesized an artificial group M consensus env gene (CON6 gene) to be equidistant from contemporary HIV-1 subtypes and recombinants. This novel envelope gene expresses a glycoprotein that binds soluble CD4, utilizes CCR5 but not CXCR4 as a coreceptor, and mediates HIV-1 entry. Key linear, conformational, and glycan-dependent monoclonal antibody epitopes are preserved in CON6, and the glycoprotein is recognized equally well by sera from individuals infected with different HIV-1 …

Antigenicity And Immunogenicity Of A Synthetic Human Immunodeficiency Virus Type 1 Group M Consensus Envelope Glycoprotein, Feng Gao, Eric A. Weaver, Zhongjing Lu, Yingying Li, Hua-Xin Liao, Benjiang Ma, S. Munir Alam, Richard M. Scearce, Laura L. Sutherland, Jae-Sung Yu, Julie M. Decker, George M. Shaw, David C. Montefiori, Bette T. Korber, Beatrice H. Hahn, Barton F. Haynes

Nebraska Center for Virology: Faculty Publications

Genetic variation of human immunodeficiency virus (HIV-1) represents a major obstacle for AIDS vaccine development. To decrease the genetic distances between candidate immunogens and field virus strains, we have designed and synthesized an artificial group M consensus env gene (CON6 gene) to be equidistant from contemporary HIV-1 subtypes and recombinants. This novel envelope gene expresses a glycoprotein that binds soluble CD4, utilizes CCR5 but not CXCR4 as a coreceptor, and mediates HIV-1 entry. Key linear, conformational, and glycan-dependent monoclonal antibody epitopes are preserved in CON6, and the glycoprotein is recognized equally well by sera from individuals infected with different HIV-1 …