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2008

University of Nebraska - Lincoln

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Articles 1 - 30 of 791

Full-Text Articles in Physical Sciences and Mathematics

Photosynthetic Response Of Soybean To Twospotted Spider Mite (Acari: Tetranychydae) Injury, Adeney De Freitas Bueno, Regiane Cristina Oliveira De Freitas Bueno, Paul David Nabity, Leon George Higley, Odair Aparecido Fernandes Dec 2008

Photosynthetic Response Of Soybean To Twospotted Spider Mite (Acari: Tetranychydae) Injury, Adeney De Freitas Bueno, Regiane Cristina Oliveira De Freitas Bueno, Paul David Nabity, Leon George Higley, Odair Aparecido Fernandes

School of Natural Resources: Faculty Publications

The twospotted spider mite Tetranychus urticae Koch is a common pest on soybean plants. To clarify plantarthropod interaction on mite-soybean system, leaf fluorescence, photosynthetic responses to variable carbon dioxide levels, and chlorophyll content were evaluated. Significant photosynthetic rate reduction was observed due to stomatal limitation. Stomatal closure was the major plant physiological response. As a consequence, there was reduction in photosynthetic rates. Surprisingly, plants did not show chlorophyll content reduction associated with photosynthetic impairment. No differences in fluorescence data indicate that T. urticae injury did not impair the function of light harvesting and photoelectron transport. These results showed that T. …

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Search For The Standard Model Higgs Boson In The Missing Energy And Acoplanar B-Jet Topology At √S = 1.96 Tev, V. M. Abazov, Kenneth A. Bloom, Gregory R. Snow, D0 Collaboration Dec 2008

Search For The Standard Model Higgs Boson In The Missing Energy And Acoplanar B-Jet Topology At √S = 1.96 Tev, V. M. Abazov, Kenneth A. Bloom, Gregory R. Snow, D0 Collaboration

Kenneth Bloom Publications

We report a search for the standard model Higgs boson in the missing energy and acoplanar b-jet topology, using an integrated luminosity of 0.93 fb-1 recorded by the D0 detector at the Fermilab Tevatron pp Collider. The analysis includes signal contributions from pp → ZH → ννbb, as well as from WH production in which the charged lepton from the W boson decay is undetected. Neural networks are used to separate signal from background. In the absence of a signal, we set limits on σ (pp → VH) x B(H → bb) at the 95% …

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A Modeling And Spatio-Temporal Analysis Framework For Monitoring Environmental Change Using Npp As An Ecosystem Indicator, Robert Crabtree, Christopher Potter, Randall Mullen, Jennifer Sheldon, Shengli Huang, Joshua Harmsen, Ann Rodman, Cathie Jean Dec 2008

A Modeling And Spatio-Temporal Analysis Framework For Monitoring Environmental Change Using Npp As An Ecosystem Indicator, Robert Crabtree, Christopher Potter, Randall Mullen, Jennifer Sheldon, Shengli Huang, Joshua Harmsen, Ann Rodman, Cathie Jean

United States National Aeronautics and Space Administration: Publications

We present and describe a modeling and analysis framework for monitoring protected area (PA) ecosystems with net primary productivity (NPP) as an indicator of health. It brings together satellite data, an ecosystem simulation model (NASA–CASA), spatial linear models with autoregression, and a GIS to provide practitioners a low-cost, accessible ecosystem monitoring and analysis system (EMAS) at landscape resolutions. The EMAS is evaluated and assessed with an application example in Yellowstone National Park aimed at identifying the causes and consequences of drought. Utilizing five predictor covariates (solar radiation, burn severity, soil productivity, temperature, and precipitation), spatio-temporal analysis revealed how landscape controls …

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The Tiffanian Land-Mammal Age (Middle And Late Paleocene) In The Northern Bighorn Basin, Wyoming, Ross Secord Dec 2008

The Tiffanian Land-Mammal Age (Middle And Late Paleocene) In The Northern Bighorn Basin, Wyoming, Ross Secord

Department of Earth and Atmospheric Sciences: Faculty Publications

The Tiffanian North American land-mammal age is an informal biochronologic unit that spans 4.5 myr of the middle and late Paleocene. It is preceded and succeeded by the Torrejonian and Clarkforkian land-mammal ages, respectively. The Tiffanian was initially based on a small collection of mammals from southern Colorado, but faunas of Tiffanian age are now known throughout the Rocky Mountain region. The richest and most complete sequence of middle and late Tiffanian faunas known occurs in the northern Bighorn Basin. These faunas are the primary basis for regional Tiffanian biochronology. The Bighorn Basin sequence is also important because it preserves …

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Search For Third Generation Scalar Leptoquarks Decaying Into ΤB, V. M. Abazov, Kenneth A. Bloom, Gregory Snow, D0 Collaboration Dec 2008

Search For Third Generation Scalar Leptoquarks Decaying Into ΤB, V. M. Abazov, Kenneth A. Bloom, Gregory Snow, D0 Collaboration

Kenneth Bloom Publications

We have searched for third generation leptoquarks (LQ3) using 1.05 fb-1 of data collected with the D0 detector at the Fermilab Tevatron Collider operating at √s = 1.96 TeV. We set a 95% C.L. lower limit of 210 GeV on the mass of a scalar LQ3 state decaying solely to a b quark and a τ lepton.

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Measurement Of BS0 Mixing Parameters From The Flavor-Tagged Decay BS0 → J/Ψφ, V. M. Abazov, Kenneth A. Bloom, Gregory Snow, D0 Collaboration Dec 2008

Measurement Of BS0 Mixing Parameters From The Flavor-Tagged Decay BS0 → J/Ψφ, V. M. Abazov, Kenneth A. Bloom, Gregory Snow, D0 Collaboration

Kenneth Bloom Publications

From an analysis of the flavor-tagged decay Bs0 → J/ ψφ we obtain the width difference between the Bs0 light and heavy mass eigenstates, ΔΓs = 0.19 ± 0.07 (stat)-0.01+0.02 (syst) ps-1, and the CP-violating phase, φs = -0.57-0.30+0.24(stat)-0.02+0.08(syst). The allowed 90% CL intervals of ΔΓs and φs are 0.06 < ΔΓs < 0.30 ps-1 and -1.20< φs < 0.06, respectively. The data sample corresponds to an integrated luminosity of 2.8 fb-1 accumulated with the D0 detector at the Fermilab Tevatron collider.

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Observation Of The Doubly Strange B Baryon ΩB-, V. M. Abazov, Kenneth A. Bloom, Gregory Snow, D0 Collaboration Dec 2008

Observation Of The Doubly Strange B Baryon ΩB-, V. M. Abazov, Kenneth A. Bloom, Gregory Snow, D0 Collaboration

Kenneth Bloom Publications

We report the observation of the doubly strange b baryon Ωb- in the decay channel Ωb- → J/ψΩ-, with J/ψ → μ+μ- and Ω- → ΛK- → (pπ-)K-, in pp collisions at √s = 1.96 TeV. Using approximately 1.3 fb-1 of data collected with the D0 detector at the Fermilab Tevatron Collider, we observe 17:8 ± 4.9(stat) ± 0.8(syst) Ωb- signal events at a mass of 6.165 ± 0.010(stat) ± 0.013(syst) GeV. The significance of …

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Hydrochemistry Of Wetlands Along The Platte River Near Ashland, Nebraska, Carrie L. Wiese Dec 2008

Hydrochemistry Of Wetlands Along The Platte River Near Ashland, Nebraska, Carrie L. Wiese

School of Natural Resources: Dissertations, Theses, and Student Research

No abstract provided.

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Neural Networks As A Tool For Constructing Continuous Ndvi Time Series From Avhrr And Modis, M. E. Brown, D. J. Lary, A. Vrieling, D. Stathakis, H. Mussa Dec 2008

Neural Networks As A Tool For Constructing Continuous Ndvi Time Series From Avhrr And Modis, M. E. Brown, D. J. Lary, A. Vrieling, D. Stathakis, H. Mussa

United States National Aeronautics and Space Administration: Publications

The long term Advanced Very High Resolution Radiometer (AVHRR)- Normalized Difference Vegetation Index (NDVI) record provides a critical historical perspective on vegetation dynamics necessary for global change research. Despite the proliferation of new sources of global, moderate resolution vegetation datasets, the remote sensing community is still struggling to create datasets derived from multiple sensors that allow the simultaneous use of spectral vegetation for time series analysis. To overcome the non-stationary aspect of NDVI, we use an artificial neural network (ANN) to map the NDVI indices from AVHRR to those from MODIS using atmospheric, surface type and sensorspecific inputs to account …

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Measuring And Modeling Co2 And H2O Fluxes In Complex Terrain, Diego Andrés Riveros-Iregui, Brian L. Mcglynn Dec 2008

Measuring And Modeling Co2 And H2O Fluxes In Complex Terrain, Diego Andrés Riveros-Iregui, Brian L. Mcglynn

School of Natural Resources: Faculty Publications

The feedbacks between the water and the carbon cycles are of critical importance to global carbon balances. Forests and forest soils in northern latitudes are important carbon pools because of their potential as sinks for atmospheric carbon. However there are significant unknowns related to the effects of hydrologic variability, mountainous terrain, and landscape heterogeneity in controlling soil carbon dioxide (CO2) efflux. Mountainous terrain imposes large spatial heterogeneity in the biophysical controls of soil CO2 production and efflux, including soil temperature, soil water content, vegetation, substrate, and soil physical properties. Further complications are introduced by the superimposed temporal …

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Isotopic Evidence Of Methane Oxidation Across The Surface Water–Ground Water Interface, Diego Andrés Riveros-Iregui, Jennifer Y. King Dec 2008

Isotopic Evidence Of Methane Oxidation Across The Surface Water–Ground Water Interface, Diego Andrés Riveros-Iregui, Jennifer Y. King

School of Natural Resources: Faculty Publications

Biogenic methane (CH4) from wetlands plays a crucial role in the carbon cycle, but the dynamics of dissolved methane flux across the surface water-ground water interface remain poorly understood. This study focused on the effects of spatial transformation of dissolved methane and the role of ground-water recharge in the distribution of dissolved methane across the surface water-ground water interface. Here we present carbon isotopic measurements of biogenic methane and dissolved inorganic carbon (DIC) from the Sarita Wetland, on the St. Paul Campus of the University of Minnesota, and also in six monitoring wells located down gradient from the …

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Effective-Range Theory For An Electron In A Short-Range Potential And A Laser Field, M. V. Frolov, N. L. Manakov, Anthony F. Starace Dec 2008

Effective-Range Theory For An Electron In A Short-Range Potential And A Laser Field, M. V. Frolov, N. L. Manakov, Anthony F. Starace

Anthony F. Starace Publications

The time-dependent effective-range (TDER) theory introduced by Frolov et al. [Phys. Rev. Lett. 91, 053003 (2003)] and used in numerous applications for processes involving a linearly polarized intense laser field is presented in detail for the general problem of an electron, initially bound in a short-range potential, interacting with a laser field of arbitrary polarization. The TDER theory combines the well-known effective-range theory for a weakly bound electron in a short-range potential with the quasistationary, quasienergy state (QQES) or Floquet formulation for an electron interacting with a harmonic, time-dependent field, such as a monochromatic laser field. We present the basic …

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Comparison Of The Fuel Needed To Transport Plastic Recyclables Verses Aluminum Recyclables From Yellowstone National Park, Melissa Dejonge Dec 2008

Comparison Of The Fuel Needed To Transport Plastic Recyclables Verses Aluminum Recyclables From Yellowstone National Park, Melissa Dejonge

Department of Environmental Studies: Undergraduate Student Theses

Research has provided no definitive answers on whether PET plastic bottles or aluminum cans are a more environmentally sustainable choice as soda containers. This paper researches the fuel used in recycling each of these materials from Yellowstone National Park to processing locations. The data is used to determine which of these alternatives use less fuel in this process. It was found that plastics use more fuel when transported from Yellowstone National Park to the processing center. Aluminum uses less fuel per ton to transport from Yellowstone to the processing center. The conclusions from this research may have implications on which …

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Search For Neutral Higgs Bosons In Multi-B-Jet Events In Pp Collisions At √S = 1.96 Tev, V. M. Abazov, Kenneth A. Bloom, Gregory Snow, D0 Collaboration Nov 2008

Search For Neutral Higgs Bosons In Multi-B-Jet Events In Pp Collisions At √S = 1.96 Tev, V. M. Abazov, Kenneth A. Bloom, Gregory Snow, D0 Collaboration

Kenneth Bloom Publications

Data recorded by the D0 experiment at the Fermilab Tevatron Collider are analyzed to search for neutral Higgs bosons produced in association with b quarks. This production mode can be enhanced in the minimal supersymmetric standard model (MSSM). The search is performed in the three b quark channel using multijet triggered events corresponding to an integrated luminosity of 1 fb-1. No statistically significant excess of events with respect to the predicted background is observed and limits are set in the MSSM parameter space.

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Search For Anomalous Wtb Couplings In Single Top Quark Production, V. M. Abazov, Kenneth A. Bloom, Gregory Snow, D0 Collaboration Nov 2008

Search For Anomalous Wtb Couplings In Single Top Quark Production, V. M. Abazov, Kenneth A. Bloom, Gregory Snow, D0 Collaboration

Kenneth Bloom Publications

In 0.9 fb-1 of pp collisions, the D0 Collaboration presented evidence for single top quark production in events with an isolated lepton, missing transverse momentum, and two to four jets. We examine these data to study the Lorentz structure of the Wtb coupling. The standard model predicts a left-handed vector coupling at the Wtb vertex. The most general lowest dimension, CP-conserving Lagrangian admits right-handed vector and left- or right-handed tensor couplings as well. We find that the data prefer the left-handed vector coupling and set upper limits on the anomalous couplings. These are the first direct constraints on …

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Comparison Of Three Models For Predicting Gross Primary Production Across And Within Forested Ecoregions In The Contiguous United States, Nicholas C. Coops, Colin J. Ferster, Richard H. Waring, Joanne Nightingale Nov 2008

Comparison Of Three Models For Predicting Gross Primary Production Across And Within Forested Ecoregions In The Contiguous United States, Nicholas C. Coops, Colin J. Ferster, Richard H. Waring, Joanne Nightingale

United States National Aeronautics and Space Administration: Publications

Gross primary production (GPP), the photosynthetic uptake of carbon, is an important variable in the global carbon cycle. Although continuous measurements of GPP are being collected from a network of micrometeorological towers, each site represents a small area with records available for only a limited period. As a result, GPP is commonly modeled over forested landscapes as a function of climatic and soil variables, often supplemented with satellite-derived estimates of the vegetation's light-absorbing properties. Since the late 1990s, a number of models have been developed to provide seasonal and annual estimates of GPP across much of the Earth. Each model, …

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Measurement Of The Electron Charge Asymmetry In Pp → W + X → Eν + X Events At √S = 1.96 Tev, V. M. Abazov, Kenneth A. Bloom, Gregory Snow, D0 Collaboration Nov 2008

Measurement Of The Electron Charge Asymmetry In Pp → W + X → Eν + X Events At √S = 1.96 Tev, V. M. Abazov, Kenneth A. Bloom, Gregory Snow, D0 Collaboration

Kenneth Bloom Publications

We present a measurement of the electron charge asymmetry in pp → W + X → eν + X events at a center of mass energy of 1.96 TeV using 0.75 fb-1 of data collected with the D0 detector at the Fermilab Tevatron Collider. The asymmetry is measured as a function of the electron transverse momentum and pseudorapidity in the interval (-3.2, 3.2) and is compared with expectations from next-to-leading order calculations in perturbative quantum chromodynamics. These measurements will allow more accurate determinations of the proton parton distribution functions.

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Temperature Dependence Of The Training Effect In Exchange Coupled Ferromagnetic Bilayers, Christian Binek, Srinivas Polisetty, Sarbeswar Sahoo Nov 2008

Temperature Dependence Of The Training Effect In Exchange Coupled Ferromagnetic Bilayers, Christian Binek, Srinivas Polisetty, Sarbeswar Sahoo

Christian Binek Publications

The temperature dependence of the training effect is studied in an exchange coupled thin-film bilayer composed of a hard ferromagnetic pinning (CoPtCrB) layer in proximity of a soft ferromagnetic pinned (CoCr) layer. Interlayer exchange shifts the hysteresis loops of the soft layer along the magnetic-field axis. This shift is quantified by the bias field in far reaching analogy to the exchange bias field of conventional antiferromagnetic/ferromagnetic heterostructures. A ferromagnetic domain state induced in the hard layer experiences aging very similar to the training behavior of the antiferromagnetic domain state in conventional exchange bias systems. Training originates from changes in the …

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Benchmarking Corn Water Productivity In Nebraska Irrigated Cropping Systems, Kenneth Cassman Nov 2008

Benchmarking Corn Water Productivity In Nebraska Irrigated Cropping Systems, Kenneth Cassman

Nebraska Center for Energy Sciences Research: White Papers and Presentations

Improving corn water productivity is the key to meet the challenge of ever tightening water resources for irrigation and greater demands for food, feed and fuel. Corn grain yield per unit of water supply must therefore be increased dramatically in Nebraska and globally. In Nebraska, ≈80% of the irrigated land is for corn production. At present, there is a substantial exploitable gap between actual farm yields and attainable yields. This reflects, in part, inefficient use of water supply, and/or other non‐water related yield constraints. Boundary functions define the relationship of yield with water supply and are used to benchmark crop …

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Energy Conservation Through Improved Irrigation Pumping Plant Performance, William Kranz Nov 2008

Energy Conservation Through Improved Irrigation Pumping Plant Performance, William Kranz

Nebraska Center for Energy Sciences Research: White Papers and Presentations

Nebraska has approximately 90,000 active irrigation wells that are powered by electric motors or gasoline, natural gas, propane or diesel fueled engines. Pumping plant performance data collected prior to 1990 indicated an average performance rating of 77 percent of the Nebraska Pumping Plant Performance Criteria (NPPPC). More recent tests confirm that pumping plant performance remains well below the Nebraska Criteria. Though significant improvement has been made in the brake horsepower output per unit of fuel for internal combustion engines, recent increases in fuel costs have more than doubled pumping costs during the past 3 years. Efficient irrigation pumping plants could …

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Improving The Efficiency Of Water And Energy Use In Nebraska’S Irrigation Soybean Production Systems, James Specht Nov 2008

Improving The Efficiency Of Water And Energy Use In Nebraska’S Irrigation Soybean Production Systems, James Specht

Nebraska Center for Energy Sciences Research: White Papers and Presentations

The use of irrigation in Nebraska’s soybean production systems has steadily increased to the extent that irrigated soybean acreage in recent years has accounts for about 45% of State total soybean acreage. Technological advances in irrigation equipment can greatly improve on‐farm water application efficiencies (with respect to both energy and water). However, producer adoption of these advances is very slow because of the capital expenditures required for irrigation system upgrades. An alternative approach is greater producer adoption and use of irrigation water management strategies that ensure that water is scheduled and applied in a just‐in‐time fashion, which also optimizes water …

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Phylotyping And Functional Analysis Of Two Ancient Human Microbiomes, Raúl Y. Tito, Simone Macmil, Graham Wiley, Fares Najar, Lauren Cleeland, Chunmei Qu, Ping Wang, Frederic Romagne, Sylvain Leonard, Agustín Jiménez Ruiz, Karl Reinhard, Bruce A. Roe, Cecil M. Lewis, Jr. Nov 2008

Phylotyping And Functional Analysis Of Two Ancient Human Microbiomes, Raúl Y. Tito, Simone Macmil, Graham Wiley, Fares Najar, Lauren Cleeland, Chunmei Qu, Ping Wang, Frederic Romagne, Sylvain Leonard, Agustín Jiménez Ruiz, Karl Reinhard, Bruce A. Roe, Cecil M. Lewis, Jr.

School of Natural Resources: Faculty Publications

Background: The Human Microbiome Project (HMP) is one of the U.S. National Institutes of Health Roadmap for Medical Research. Primary interests of the HMP include the distinctiveness of different gut microbiomes, the factors influencing microbiome diversity, and the functional redundancies of the members of human microbiotas. In this present work, we contribute to these interests by characterizing two extinct human microbiotas.

Methodology/Principal Findings: We examine two paleofecal samples originating from cave deposits in Durango Mexico and dating to approximately 1300 years ago. Contamination control is a serious issue in ancient DNA research; we use a novel approach to control contamination. …

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Smartstore: A New Metadata Organization Paradigm With Metadata Semantic-Awareness For Next-Generation File Systems, Yu Hua, Hong Jiang, Yifeng Zhu, Dan Feng, Lei Tian Nov 2008

Smartstore: A New Metadata Organization Paradigm With Metadata Semantic-Awareness For Next-Generation File Systems, Yu Hua, Hong Jiang, Yifeng Zhu, Dan Feng, Lei Tian

CSE Technical Reports

Existing data storage systems based on hierarchical directory tree do not meet scalability and functionality requirements for exponentially growing datasets and increasingly complex metadata queries in large-scale file systems with billions of files and Exabytes of data. This paper proposes a novel decentralized semantic-aware metadata organization, called SmartStore, which exploits metadata semantics of files to judiciously aggregate correlated files into semantic-aware groups by using information retrieval tools. The decentralized design of SmartStore can improve system scalability and reduce query latency for both complex queries (including range and top-k queries), which is helpful to construct semantic-aware caching, and conventional filename-based point …

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Ideas: An Identity-Based Security Architecture For Large-Scale And High-Performance Storage Systems, Zhongying Niu, Ke Zhou, Hong Jiang, Dan Feng, Tianming Yang Nov 2008

Ideas: An Identity-Based Security Architecture For Large-Scale And High-Performance Storage Systems, Zhongying Niu, Ke Zhou, Hong Jiang, Dan Feng, Tianming Yang

CSE Technical Reports

We develop IDEAS, an identity-based security architecture for large-scale and high-performance storage systems, designed to improve security, convenience and total cost of access control by merging identity management with access control in these systems. IDEAS authenticates users at each I/O node by using a single-identity certificate without the service of a centralized security server and enforces access control mechanism by using an object-based access control (OBAC) model, which is designed to address the complexity and scalability issue of security administration in large-scale storage systems. We also discuss the issue of how to identify and authenticate a large number of users …

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Measurement Of The Forward-Backward Charge Asymmetry And Extraction Of Sin2ӨWEff In Pp → Z/Γ* +X → E+E- + X Events Produced At √S = 1.96 Tev, V. M. Abazov, Kenneth A. Bloom, Gregory Snow, D0 Collaboration Nov 2008

Measurement Of The Forward-Backward Charge Asymmetry And Extraction Of Sin2ӨWEff In Pp → Z/Γ* +X → E+E- + X Events Produced At √S = 1.96 Tev, V. M. Abazov, Kenneth A. Bloom, Gregory Snow, D0 Collaboration

Kenneth Bloom Publications

We present a measurement of the forward-backward charge asymmetry (AFB) in pp → Z/γ* +X → e+e- + X events at a center-of-mass energy of 1.96 TeV using 1.1 fb-1 of data collected with the D0 detector at the Fermilab Tevatron collider. AFB is measured as a function of the invariant mass of the electron-positron pair, and found to be consistent with the standard model prediction. We use the AFB measurement to extract the effective weak mixing angle sin2ӨWeff = 0.2326 ± 0.0018 (stat) ± 0.0006 (syst).

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Refuge Update – November/December 2008, Volume 5, Number 6 Nov 2008

Refuge Update – November/December 2008, Volume 5, Number 6

RefugeUpdate (USFWS-NWRS)

Table of Contents:

Do-It-Yourself Project Makes Sparks, page 3 The Departments of the Interior and Energy spotlight San Andres Refuge’s innovative (and largely homemade) renewable energy program.

In Oregon, a Refuge Teaches Teachers, page 5 Tualatin River National Wildlife Refuge’s ambitious environmental education program acquires a solid reputation.

Focus on . . . International Conservation, pages 6-11 National resource managers around the world look to the Refuge System for on-the-scene advice and training.

Taking Pride, page 16 A former refuge complex project leader in Texas and a super-volunteer in Georgia win 2008 Take Pride in America Awards.

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Regulating Self-Organizing Nanostructures Via External Mechanism, Jiangyu Li, Q. G. Du, Stephen Ducharme Nov 2008

Regulating Self-Organizing Nanostructures Via External Mechanism, Jiangyu Li, Q. G. Du, Stephen Ducharme

Stephen Ducharme Publications

Self-organizing nanostructures are ubiquitous in both natural and synthetic materials. They are not only appealing scientifically, by revealing the intrinsic atomic and molecular interactions that might be difficult to detect otherwise, but may also hold the key for the development of novel functional structures and devices. For their technological potential to be fully realized, the size, morphology, and distribution of the self-organizing nanostructures must be regulated. In this paper, we investigate the principles under which the self-organizing nanostructures can be regulated via external mechanisms. Using nanomesa and nanowell formation in polyvinylidene fluoride trifluoroethylene copolymer film as an example, we demonstrate …

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Lifestyle Of Shellmound Builders In Brazil (Galley Proofs), Sabine Eggers, C. C. Petronilho, K. Brandt, J. Filippini, Karl J. Reinhard Nov 2008

Lifestyle Of Shellmound Builders In Brazil (Galley Proofs), Sabine Eggers, C. C. Petronilho, K. Brandt, J. Filippini, Karl J. Reinhard

School of Natural Resources: Faculty Publications

The contact of inland and coastal prehistoric groups in Brazil is believed to have been restricted to regions with no geographical barrier, as is the case in the Ribeira de Iguape valley. The inland osteological collection from the riverine shellmound Moraes (5800–4500 BP) represents a unique opportunity to test this assumption for this region. Despite cultural similarities between riverine and coastal shellmounds, important ecological and site distribution differences are expected to impact on lifestyle. The purpose of this study is thus to document and interpret health and lifestyle indicators in Moraes in comparison to coastal shellmound groups. Specifically we test …

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Precise Measurement Of The Top-Quark Mass From Lepton + Jets Events, V. M. Abazov, Kenneth A. Bloom, D0 Collaboration Oct 2008

Precise Measurement Of The Top-Quark Mass From Lepton + Jets Events, V. M. Abazov, Kenneth A. Bloom, D0 Collaboration

Kenneth Bloom Publications

We measure the mass of the top quark using top-quark pair candidate events in the lepton + jets channel from data corresponding to 1 fb-1 of integrated luminosity collected by the D0 experiment at the Fermilab Tevatron collider. We use a likelihood technique that reduces the jet energy scale uncertainty by combining an in situ jet energy calibration with the independent constraint on the jet energy scale (JES) from the calibration derived using photon þ jets and dijet samples. We find the mass of the top quark to be 171.5 ± 1.8(stat) + JES) ± 1.1(syst) GeV.

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Measurement Of The Polarization Of The Ү(1S) And Ү(2S) States In Pp Collisions At √S = 1.96 Tev, V. M. Abazov, Kenneth A. Bloom, Gregory Snow, D0 Collaboration Oct 2008

Measurement Of The Polarization Of The Ү(1S) And Ү(2S) States In Pp Collisions At √S = 1.96 Tev, V. M. Abazov, Kenneth A. Bloom, Gregory Snow, D0 Collaboration

Kenneth Bloom Publications

We present a study of the polarization of the Ү(1S) and Ү(2S) states using a 1.3 fb-1 data sample collected by the D0 experiment in 2002–2006 during run II of the Fermilab Tevatron Collider. We measure the polarization parameter α = (σT - 2σL), where σT and σL are the transversely and longitudinally polarized components of the production cross section, as a function of the transverse momentum (pTҮ) for the Ү(1S) and Ү(2S). Significant pTҮ-dependent longitudinal polarization is observed …

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