Digital Commons Network^™

Real-Time Identification Of Sliding Friction Using Labview Fpga, Laine Mears, Jeannie S. Falcon, Thomas R. Kurfess

Publications

Friction is present in all mechanical systems, and can greatly affect system stability and control in precision motion applications. In this paper, we present application of a frictional model to trajectory planning of a part centering system with real-time identification of model parameters through system force and position response. This identification is carried out using LabVIEW motion control software and digital signal processing (DSP) and field-programmable gate array (FPGA) hardware. A comparison of hardware performance for force measurement is also made.

Unm Nih Investigator Policy Knowledge And Attitudes Survey, Philip J. Kroth, Erinn E. Aspinall, Holly E. Phillips

Publications

Survey instrument used to assess UNM NIH-funded investigators' knowledge, acceptance and perceived barriers to compliance with the NIH Enhanced Public Access Policy.

Lp 400-22, A Very Low Mass And High-Velocity White Dwarf, Adela Kawka, Stephane Vennes, Terry D. Oswalt, J. Allyn Smith, Nicole M. Silvestri

Publications

We report the identification of LP 400-22 (WD 2234 + 222) as a very low mass and high-velocity white dwarf. The ultraviolet GALEX and optical photometric colors and a spectral line analysis of LP 400-22 show this star to have an effective temperature of 11,080 ± 140 K and a surface gravity of log g p 6.32 ± 0.08. Therefore, this is a helium-core white dwarf with a mass of 0.17 M_Ꙩ. The tangential velocity of this white dwarf is 414 ± 43 km s^-1, making it one of the fastest moving white dwarfs known. We …

The Mystery Deepens: Spitzer Observations Of Cool White Dwarfs, Mukremin Kilic, Ted Von Hippel, Et Al.

Publications

We present 4.5 and 8 µm photometric observations of 18 cool white dwarfs obtained with the Spitzer Space Telescope. Our observations demonstrate that four white dwarfs with Teᶠᶠ < 6000 K show slightly depressed mid-infrared fluxes relative to white dwarf models. In addition, another white dwarf with a peculiar optical and near-infrared spectral energy distribution (LHS 1126) is found to display significant flux deficits in Spitzer observations. These mid-infrared flux deficits are not predicted by the current white dwarf models including collision-induced absorption due to molecular hydrogen. We postulate that either the collision-induced absorption calculations are incomplete or there are other unrecognized physical processes occurring in cool white dwarf atmospheres. The spectral energy distribution of LHS 1126 surprisingly fits a Rayleigh-Jeans spectrum in the infrared, mimicking a hot white dwarf with effective temperature well in excess of 105 K. This implies that the source of this flux deficit is probably not molecular absorption but some other process.

Evidence-Based Public Health (Ebph) Informatics Training For Public Health Practitioners In New Mexico. Final Report., Jonathan D. Eldredge

Publications

Final report of training project for teaching Evidence-Based Public Health (EBPH)informatics skills to Department of Health (DoH) professionals throughout New Mexico during 2005-2006.

Erratum: "Hyades Oxygen Abundances From The K6300 [O I} Line: The Giant-Dwarf Oxygen Discrepancy Revisted", Simon C. Schuler, Artie P. Hatzes, Jeremy R. King, Martin Kurster, Lih-Sin The

Publications

In Table 6 of the original submission, the dwarf [O/H] abundances derived using the OVER model atmospheres are listed incorrectly. The abundances are corrected in the updated table provided below. These changes do not affect the results reported in the paper.

Are Ti44-Producing Supernovae Exceptional?, L.-S. The, Donald D. Clayton, R Diehl, Dieter H. Hartmann, A F. Iyudin, M D. Leising, B S. Meyer, Y Motizuki, V Schönfelder

Publications

According to standard models supernovae produce radioactive ⁴⁴Ti, which should be visible in gamma-rays following decay to ⁴⁴Ca for a few centuries. ⁴⁴Ti production is believed to be the source of cosmic ⁴⁴Ca, whose abundance is well established. Yet, gamma-ray telescopes have not seen the expected young remnants of core collapse events. The ⁴⁴Ti mean life of 89 y and the Galactic supernova rate of 3/100 y imply several detectable ⁴⁴Ti gamma-ray sources, but only one is clearly seen, the 340-year-old Cas A SNR. Furthermore, supernovae which produce much ⁴⁴Ti are expected …

Uaa Student Showcase Journal: Recognizing Excellence (2006), N/A N/A

Publications

No abstract provided.

Bottomland Hardwood Management Demonstrations For South Carolina's Lowcountry Forest Conservation Project, William Conner, R Franklin, T Williams, G Kessler, A Nygaard

Publications

Southern bottomland hardwood forests occur on river floodplains of the southeastern United States, and ecological processes are driven by seasonal floodwaters from the river. Conservation and management of southeastern US coastal plain ecosystems is a priority in South Carolina’s Lowcountry Forest Conservation Project. The project is a partnership of Clemson University, Ducks Unlimited, the Joseph W. Jones Ecological Research Center, Lowcountry Open Land Trust, South Carolina Coastal Conservation League, The Conservation Fund, and The Nature Conservancy. A goal of this project is to create and disseminate economically and ecologically viable methods for conservation-based bottomland hardwood management on private lands, including …

Post-Outburst Infrared Spectra Of V1647 Ori, The Illuminating Star Of Mcneil's Nebula, E L. Gibb, T W. Rettig, Sean D. Brittain, D Wasikowski, Theodore Simon, William D. Vacca, Michael C. Cushing, C Kulesa

Publications

V1647 Ori is a low mass star in the L1630 star-forming region that underwent an outburst in late 2003/early 2004. We present post-outburst infrared spectra obtained with NIRSPEC (Keck II) and SpeX (IRTF) and compare these to spectra taken during the outburst. The results show that the temperature of the hot CO formed in the inner part of the disk has declined by ~800 K, while the water and CO ice and low-J CO gas features remained unchanged, consistent with previous assertions that the latter, low-temperature features arise in the foreground cloud. The P-Cygni profiles of the Paschen series that …

Aall History Through The Eyes Of Its Presidents, Frank G. Houdek

Publications

On the occasion of the celebration of AALL's centennial in 2006, Professor Houdek offers a personalized history of the Association by presenting reminiscences of those who have served as its president. Collectively, these stories contribute a unique perspective on the important issues that have confronted AALL as an organization and law librarianship as a profession. They also help explain how these individuals became AALL leaders and what the experience meant to them.

Comparative Predation On Naturally Occurring Gypsy Moth (Lepidoptera: Lymantriidae) Pupae And Deployed Freeze-Dried Pupae, Eric M. Schauber, Clive G. Jones

Publications

Predation is an important factor in the dynamics of gypsy moth (Lymantria dispar L.) populations, yet predation rates can be difficult to estimate accurately in the field. Biased estimates can result from spatial heterogeneity in risk or from artifacts associated with deploying prey. Here we compare predation rates on freeze-dried gypsy moth pupae affixed with beeswax to pieces of burlap with predation rates on naturally occurring live pupae in the same sites. Daily predation rates, primarily by small mammals, were two to eight times greater for freeze-dried deployed pupae than natural pupae, depending on the year. These results indicate …

Evaluation Of Natural-Source Vitamin E, Rrr-Α-Tocopheryl Acetate, As A Micronutrient In Sunshine Bass Feed, Jesse T. Trushenski, Christopher C. Kohler

Publications

A variety of vitamin E isomers can be used in the manufacture of animal feeds, though the efficacy of these sources varies. Our purpose was to evaluate natural-source vitamin E, RRR-a-tocopheryl acetate (NSVE), as an alternative to synthetic vitamin E, all-rac-a-tocopheryl acetate (SYNE), in the diets of sunshine bass (female white bass Morone chrysops X male striped bass M. saxatilis). Our specific objectives were to evaluate graded levels of NSVE in terms of meeting the vitamin E requirement of sunshine bass and to address the physiological and economic suitability of NSVE by direct comparison with SYNE. Five isocaloric, isonitrogenous, …

Challenges And Opportunities In Finfish Nutrition, Jesse Trushenski, Craig Kasper, Christopher Kohler

Publications

Much of the criticism leveled at aquaculture (e.g., dependency on animal-derived feedstuffs, nutrient-laden effluent discharges, and increased organic contamination in edible products) can be traced to the feeds in use. Accordingly, finfish nutritionists are being challenged to formulate feeds that not only meet the nutritional requirements of livestock but also minimize production costs, limit environmental impacts, and enhance product quality. These challenges not only add considerable complexity to finfish nutrition but also afford opportunities to avoid some of the mistakes made by other industries in the past. From a review of the current status of finfish nutrition with respect to …

Intermartensitic Transformations In Ni2mn1−Xcoxga Heusler Alloys, Mahmud Khan, Shane Stadler, Naushad Ali

Publications

Ni₂MnGa that possesses a Heusler L2₁ structure undergoes a martensitic transformation from the parent cubic (austenitic) phase to a low temperature complex tetragonal structure at T_M = 202 K and has a Curie temperature of T_C = 376 K. Some research groups have observed an intermartensitic transformation at a temperature T_I<T_M, in Ni₂MnGa single crystals. In this work detailed studies on the influence of substitution in the Mn subsystem by magnetic Co on the intermartensitic transformation properties of Ni₂Mn_1−xCo_xGa compounds have …

Magnetocaloric Properties Of The Ni2mn1−X(Cu,Co)Xga Heusler Alloys, A. M. Gomes, M. Khan, S. Stadler, N. Ali, I. Dubenko, A. Y. Takeuchi, A. P. Guimarães

Publications

We have investigated the magnetocaloric properties on the Ni₂Mn_1−xA_xGa Heusler alloys with partial substitution of Mn by A = Co (x = 0.10, 0.20, and 0.30) and Cu (x = 0.15 and 0.20) in the vicinity of the martensitic transition by measuring magnetization curves at magnetic field up to 20 kOe and in the temperature range of 250–300 K. The changes of the magnetic part of entropy dependence on magnetic field and temperature have been evaluated.

Structural And Mechanical Properties Of Tazrn Films: Experimental And Ab Initio Studies, S M. Aouadi

Publications

This paper reports on the growth and characterization of the structural and mechanical properties of tantalum zirconium nitride films and the subsequent simulation of these properties using an ab initio calculation based on density functional theory (DFT) within the generalized gradient approximation. The films were deposited by reactive unbalanced magnetron sputtering and their physical and chemical properties were studied by means of x-ray diffraction (XRD), Rutherford backscattering (RBS), and nanoindentation. XRD revealed that these films formed a solid solution and that the lattice constant decreased linearly with Ta content. RBS provided the elemental composition of the films. Nanoindentation was used …

Beneath The Tip Of The Iceberg: A Human Factors Analysis Of General Aviation Accidents In Alaska Versus The Rest Of The United States, Cristy Detwiler, Carla Hackworth, Kali Holcomb, Albert Boquet, Elaine Pfleiderer, Douglas Wiegmann, Scott Shappell

Publications

Historically, general aviation (GA) accidents have been overlooked and their impact under-appreciated when compared with those in the commercial or military sector. Recently however, the Federal Aviation Administration and other governmental and civilian organizations have focused their attention on one piece of this proverbial “iceberg,” that being GA accidents occurring in Alaska. This study examines more than 17,000 GA accidents using the Human Factors Analysis and Classification System. Comparisons of Alaska to the rest of the U.S. (RoUS) included traditional demographic and environmental variables, as well as the human errors committed by aircrews. Overall, categorical differences among unsafe acts (decision …

Growth Of Carbon Grains In Supernova Ejecta, Ethan A-N. Deneault, Donald D. Clayton, Bradley S. Meyer

Publications

We present a chemical reaction network that describes the condensation chemistry of carbon dust grains in an expanding supernova shell. We assume that the region of interest consists solely of gaseous free carbon and oxygen atoms and that the buildup of CO is counteracted by the radioactive decay of 56Co, which breaks up the CO mol-ecule and allows C to condense into solids. Our chemical model takes C to first form linear chains, which, at some critical length, transition into ringed isomers. These isomers are more resistant to oxidation than linear chains. These ringed isomers form the nuclei for the …

Structural Response Of Caribbean Dry Forests To Hurricane Winds: A Case Study From Guanica Forest, Puerto Rico, Skip Van Bloem, Ariel E. Lugo, Peter G. Murphy

Publications

Aim

Tropical dry forests in the Caribbean have an uniquely short, shrubby structure with a high proportion of multiple-stemmed trees compared to dry forests elsewhere in the Neotropics. Previous studies have shown that this structure can arise without the loss of main stems from cutting, grazing, or other human intervention. The Caribbean has a high frequency of hurricanes, so wind may also influence forest stature. Furthermore, these forests also tend to grow on soils with low amounts of available phosphorus, which may also influence structure. The objective of this study was to assess the role of high winds in structuring …

The Clock Paradox In A Static Homogeneous Gravitational Field, Preston Jones, Lucas F. Wanex

Publications

The gedanken experiment of the clock paradox is solved exactly using the general relativistic equations for a static homogeneous gravitational field. We demonstrate that the general and special relativistic clock paradox solutions are identical and in particular that they are identical for finite acceleration. Practical expressions are obtained for proper time and coordinate time by using the destination distance as the key observable parameter. This solution provides a formal demonstration of the identity between the special and general relativistic clock paradox with finite acceleration and where proper time is assumed to be the same in both formalisms. By solving the …

Numerical Computing For Third-Order Power Method Polynomials (Excel), Todd C. Headrick

Publications

The power method polynomial transformation is a popular procedure used for simulating univariate and multivariate non-normal distributions. It requires software that solves simultaneous nonlinear equations. Potential users of the power method may not have access to commercial software packages (e.g., Mathematica, Fortran). Therefore, algorithms are presented in the more commonly available Excel 2003 spreadsheets. The algorithms solve for (I) coefficients for polynom ials of order three, (2) intermediate correlations and Cholesky factorizations for multivariate data generation, and (3) the values of skew and kurtosis for determining if a transformation will produce a valid power method probability density function (pdt).

The Rhizomatic Relations Of A/R/Tography, Rita L. Irwin, Ruth Beer, Stephanie Springgay, Kit Grauer, Gu Xiong, Barbara Bickel

Publications

A/A/r/tography is a form of practice-based research steeped in the arts and education. Alongside other arts-based, arts-informed and aesthetically defined methodologies, a/r/tography is one of many emerging forms of inquiry that refer to the arts as a way of re-searching the world to enhance understanding. Yet, it goes even further by recognizing the educative potential of teaching and learning as acts of inquiry. Together, the arts and education complement, resist, and echo one another through rhizomatic relations of living inquiry. In this article, we demonstrate rhizomatic relations in an ongoing project entitled “The City of Richgate” where meanings are constructed …

Hiv-1 Selectively Infects A Subset Of Nonmaturing Bdca1-Positive Dendritic Cells In Human Blood, Angela Granelli-Piperno, Irina Shimeliovich, Margit D. Witmer-Pack

Publications

The infection of cultured monocyte-derived dendritic cells (DCs) with HIV-1 involves CD4 and CCR5 receptors, while transmission to T cells is enhanced at least in part by the lectin DC-SIGN/CD209. In the present study, we studied BDCA-1⁺ myeloid DCs isolated directly from human blood. These cells express CD4 and low levels of CCR5 and CXCR4 coreceptors, but not DC-SIGN. The myeloid DCs replicate two R5 viruses, BaL and YU2, and transfer infection to activated T cells. The virus productively infects a small fraction of the blood DCs that fail to mature in culture, as indicated by the maturation markers …

Antigen Targeting To Dendritic Cells Elicits Long-Lived T Cell Help For Antibody Responses, Silvia B. Boscardin, Julius C.R. Hafalla, Revati F. Masilamani

Publications

Resistance to several prevalent infectious diseases requires both cellular and humoral immune responses. T cell immunity is initiated by mature dendritic cells (DCs) in lymphoid organs, whereas humoral responses to most antigens require further collaboration between primed, antigen-specific helper T cells and naive or memory B cells. To determine whether antigens delivered to DCs in lymphoid organs induce T cell help for antibody responses, we targeted a carrier protein, ovalbumin (OVA), to DCs in the presence of a maturation stimulus and assayed for antibodies to a hapten, (4-hydroxy-3-nitrophenyl) acetyl (NP), after boosting with OVA-NP. A single DC-targeted immunization elicited long-lived …

Intensified And Protective Cd4+ T Cell Immunity In Mice With Anti-Dendritic Cell Hiv Gag Fusion Antibody Vaccine, Christine Trumpfheller, Jennifer S. Finke, Carolina B. López

Publications

Current human immunodeficiency virus (HIV) vaccine approaches emphasize prime boost strategies comprising multiple doses of DNA vaccine and recombinant viral vectors. We are developing a protein-based approach that directly harnesses principles for generating T cell immunity. Vaccine is delivered to maturing dendritic cells in lymphoid tissue by engineering protein antigen into an antibody to DEC-205, a receptor for antigen presentation. Here we characterize the CD4⁺ T cell immune response to HIV gag and compare efficacy with other vaccine strategies in a single dose. DEC-205-targeted HIV gag p24 or p41 induces stronger CD4⁺ T cell immunity relative to high …

Dendritic Cell Targeting Of Survivin Protein In A Xenogeneic Form Elicits Strong Cd4+ T Cell Immunity To Mouse Survivin, Anna Charalambous, Margarita Oks, Godwin W. Nchinda

Publications

To determine whether strong CD4⁺ T cell immunity could be induced to a nonmutated self protein that is important for tumorigenesis, we selectively targeted the xenogencic form of survivin, a survival protein overexpressed in tumors, to maturing dendritic cells in lymphoid tissues. Dendritic cell targeting via the DEC205 receptor in the presence of anti-CD40 and poly(I:C) as maturation stimuli, induced strong human and mouse survivin-specific CD4⁺ T cell responses, as determined by IFN-γ, TNF-α, and IL-2 production, as well as the development of lytic MHC class II-restricted T cells and memory. Immunity was enhanced further by depletion of …

An Evaluation Of Two Gcms: Simulation Of North American Teleconnection Indices And Synoptic Phenomena, Justin T. Schoof, S C. Pryor

Publications

We evaluate the ability of two coupled atmospheric–oceanic GCMs – the Hadley Center’s third generation coupled climate model (HadCM3) and the Canadian Center for Climate Modeling and Analysis second-generation coupled model (CGCM2) – to simulate the North Atlantic Oscillation (NAO), the Pacific North American teleconnection pattern (PNA), and map patterns in the Midwest region of the United States, relative to NCEP/NCAR reanalysis (NNR) data. The observed (NNR-derived) and GCM-derived probability distributions and temporal behavior of the daily teleconnection indices exhibit agreement over the 1990–2001 reference period, and both GCMs successfully reproduce the range of 500-hPa map patterns over the study …

Who Am I In This Story?: On The Film Adaptations Of Max Ophuls, Walter C. Metz

Publications

This essay studies the relationship between the films of Max Ophuls, both in Europe and the United States, and their relationship to their literary source material.

Presumpscot River Youth Conservation Corps 2006 Summary Report, Casco Bay Estuary Partnership, Presumpscot River Watershed Coalition, Presumpscot River Watch, Cumberland County Soil & Water Conservation District

Publications

No abstract provided.