236 research outputs found
Lower-cost tungsten-rhenium alloys
Tungsten-rhenium alloys with a substantially more dilute rhenium content have ductilities and other mechanical properties which compare favorably with the tungsten-rhenium alloys having much higher concentrations of the costly rhenium
Effects of Grain Size on the Tensile and Creep Properties of Arc-melted and Electron-beam-melted Tungsten at 2250 Deg to 4140 Deg f
Effects of grain size on tensile and creep properties of arc melted and electron beam melted tungste
High-strength tungsten alloy with improved ductility
Alloy combines superior strength at elevated temperatures with improved ductility at lower temperatures relative to unalloyed tungsten. Composed of tungsten, rhenium, hafnium, and carbon, the alloy is prepared by consumable electrode vacuum arc-melting and can be fabricated into rod, plate, and sheet
Potential for Geologic Sequestration of CO2 in Iowa
https://ir.uiowa.edu/igs_tis/1056/thumbnail.jp
Small-scale dynamo in cool main sequence stars. II. The effect of metallicity
All cool main sequence stars including our Sun are thought to have magnetic
fields. Observations of the Sun revealed that even in quiet regions small-scale
turbulent magnetic fields are present. Simulations further showed that such
magnetic fields affect the subsurface and photospheric structure, and thus the
radiative transfer and emergent flux. Since small-scale turbulent magnetic
fields on other stars cannot be directly observed, it is imperative to study
their effects on the near surface layers numerically. Until recently
comprehensive three-dimensional simulations capturing the effect of small-scale
turbulent magnetic fields only exists for the solar case. A series of
investigations extending SSD simulations for other stars has been started. Here
we aim to examine small-scale turbulent magnetic fields in stars of solar
effective temperature but different metallicity. We investigate the properties
of three-dimensional simulations of the magneto-convection in boxes covering
the upper convection zone and photosphere carried out with the MURaM code for
metallicity values of with and without a
small-scale-dynamo. We find that small-scale turbulent magnetic fields enhanced
by a small-scale turbulent dynamo noticeably affect the subsurface dynamics and
significantly change the flow velocities in the photosphere. Moreover,
significantly stronger magnetic field strengths are present in the convection
zone for low metallicity. Whereas, at the optical surface the averaged vertical
magnetic field ranges from 64G for M/H = 0.5 to 85G for M/H = -1.0.Comment: 13 pages, 18 figures, submitted to A&
Transportation Energy Futures Series: Freight Transportation Modal Shares: Scenarios for a Low-Carbon Future
Truck, rail, water, air, and pipeline modes each serve a distinct share of the freight transportation market. The current allocation of freight by mode is the product of technologic, economic, and regulatory frameworks, and a variety of factors -- price, speed, reliability, accessibility, visibility, security, and safety -- influence mode. Based on a comprehensive literature review, this report considers how analytical methods can be used to project future modal shares and offers insights on federal policy decisions with the potential to prompt shifts to energy-efficient, low-emission modes. There are substantial opportunities to reduce the energy used for freight transportation, but it will be difficult to shift large volumes from one mode to another without imposing considerable additional costs on businesses and consumers. This report explores federal government actions that could help trigger the shifts in modal shares needed to reduce energy consumption and emissions. This is one in a series of reports produced as a result of the Transportation Energy Futures project, a Department of Energy-sponsored multi-agency effort to pinpoint underexplored strategies for reducing GHGs and petroleum dependence related to transportation
The Role of Receptor for Advanced Glycation End Products in Airway Inflammation in CF and CF related Diabetes
Cystic Fibrosis (CF) is often accompanied by diabetes leading to worsening lung function, the reason for which is unclear. The receptor for advanced-glycation-end-products (RAGE) regulates immune responses and inflammation and has been linked to diabetes and possibly CF. We performed a pilot study to determine if CF and CF-related diabetes (CFRD) are associated with enhanced RAGE expression. Full length (fl)RAGE, soluble (s)RAGE, endogenous soluble (es)RAGE, S100A12 (enRAGE) and advanced-glycation-end-products (AGE) expression was assessed in serum, white blood cells and sputum of patients with CF; diabetes; CFRD and healthy subjects. Sputum enRAGE/sRAGE ratios were high in CF but particularly in CFRD which negatively correlated with % predicted FEV1. Serum AGE and AGE/sRAGE ratios were high in diabetics but not in CF. A complex, multifaceted approach was used to assess the role of RAGE and its ligands which is fundamental to determining their impact on airway inflammation. There is a clear association between RAGE activity in the airways of CF and CFRD patients that is not evident in the vascular compartment and correlates with lung function, in contrast to diabetes. This strongly suggests a role for RAGE in contributing to the inflammatory overdrive seen in CF and to a greater extent in CFRD
Measurements of and Production in + Collisions at = 200 GeV
We report measurements of charmed-hadron (, ) production cross
sections at mid-rapidity in + collisions at a center-of-mass energy of
200 GeV by the STAR experiment. Charmed hadrons were reconstructed via the
hadronic decays , and their charge conjugates,
covering the range of 0.62.0 GeV/ and 2.06.0 GeV/ for
and , respectively. From this analysis, the charm-pair production cross
section at mid-rapidity is = 170 45
(stat.) (sys.) b. The extracted charm-pair cross section is
compared to perturbative QCD calculations. The transverse momentum differential
cross section is found to be consistent with the upper bound of a Fixed-Order
Next-to-Leading Logarithm calculation.Comment: 15 pages, 16 figures. Revised version submitted to Phys. Rev.
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