16,273 research outputs found
Mixed polyvalent-monovalent metal coating for carbon-graphite fibers
An improved coating of gasification catalyst for carbon-graphite fibers is provided comprising a mixture of a polyvalent metal such as calcium and a monovalent metal such as lithium. The addition of lithium provides a lighter coating and a more flexible coating when applied to a coating of a carboxyl containing resin such as polyacrylic acid since it reduces the crosslink density. Furthermore, the presence of lithium provides a glass-like substance during combustion which holds the fiber together resulting in slow, even combustion with much reduced evolution of conductive fragments. The coated fibers are utilized as fiber reinforcement for composites
Ground-simulation investigations of VTOL airworthiness criteria for terminal-area operations
Several ground-based simulation experiments undertaken to investigate concerns related to tilt-rotor aircraft airworthiness were conducted. The experiments were conducted on the National Aeronautics and Space Administration (NASA) Ames Research Center's Vertical Motion Simulator, which permits simulation of a wide variety of aircraft with a high degree of fidelity of motion cueing. Variations in conversion/deceleration profile, type of augmentation or automation, level of display assistance, and meteorological conditions were considered in the course of the experiments. Certification pilots from the Federal Aviation Administration (FAA) and the Civil Aviation Authority (CAA) participated, in addition to NASA research pilots. The setup of these experiments on the simulator is summarized, and some of the results highlighted
Thermal conductive connection and method of making same Patent
Thermal conductive, electrically insulated cleavable adhesive connection between electronic module and heat sin
Composition of Gray Squirrel Milk
Author Institution: Ohio Division of Wildlife, New Marshfield and Department of Food Science and Nutrition, The Ohio State University, ColumbusMilk was collected from eight female gray squirrels (Sciurus carolinensis) and pooled for analysis, in an effort to determine the best substitute for gray squirrel milk for preweaned young squirrels. The sample, about 2 cc, contained 9.0 percent protein, 12.1 percent fat, 3.0 percent lactose, 1.3 percent ash, 0.36 percent calcium, and 0.45 percent phosphorus. This analysis is similar to that reported for two samples from single specimens.
Infra-red spectroscopy was used for a portion of the analysis. This method provides a useful means of analyzing the small quantities (<0.5 ml) of milk obtainable from a variety of small mammals
On the Leading Edge of Innovation: A Comparative Study of Innovation Practices
Susan J. Harper, PhD, is president of Synergy Consulting LLC, Chicago, IL 60646-6036.
Selwyn W. Becker, PhD, is professor emeritus, University of Chicago Graduate School of Business, Chicago, IL 30458
Pairs of Bloch electrons and magnetic translation groups
A product of irreducible representations of magnetic translation group is
considered. It leads to irreducible representations which were previously
rejected as nonphysical. A very simple example indicates a possible application
of these representations. In particular, they are important in descriptions of
pairs of electrons in a magnetic field and a periodic potential. The
periodicity of some properties with respect to the charge of a particle is
briefly discussed.Comment: 4 pages, RevTex. Latex2.09, amsfont
JULES-BE:Representation of bioenergy crops and harvesting in the Joint UK Land Environment Simulator vn5.1
We describe developments to the land surface model JULES, allowing for flexible user-prescribed harvest regimes of various perennial bioenergy crops or natural vegetation types. Our aim is to integrate the most useful aspects of dedicated bioenergy models into dynamic global vegetation models, in order that assessment of bioenergy options can benefit from state-of-the-art Earth system modelling. A new plant functional type (PFT) representing Miscanthus is also presented. The Miscanthus PFT fits well with growth parameters observed at a site in Lincolnshire, UK; however, global observed yields of Miscanthus are far more variable than is captured by the model, primarily owing to the model's lack of representation of crop age and establishment time. Global expansion of bioenergy crop areas under a 2 ?C emissions scenario and balanced greenhouse gas mitigation strategy from the IMAGE integrated assessment model (RCP2.6- SSP2) achieves a mean yield of 4.3 billion tonnes of dry matter per year over 2040-2099, around 30 % higher than the biomass availability projected by IMAGE. In addition to perennial grasses, JULES-BE can also be used to represent short-rotation coppicing, residue harvesting from cropland or forestry and rotation forestry
The energetics and mass structure of regions of star formation: S201
Theoretical predictions about dust and gas in star forming regions are tested by observing a 4 arcmin region surrounding the radio continuum source in 5201. The object was mapped in two far infrared wavelengths and found to show significant extended emission. Under the assumption that the molecular gas is heated solely via thermal coupling with the dust, the volume density was mapped in 5201. The ratios of infrared optical depth to CO column density were calculated for a number of positions in the source. Near the center of the cloud the values are found to be in good agreement with other determinations for regions with lower column density. In addition, the observations suggest significant molecular destruction in the outer parts of the object. Current models of gas heating were used to calculate a strong limit for the radius of the far infrared emitting grains, equal to or less than 0.15 micron. Grains of about this size are required by the observation of high temperature (T equal to or greater than 20 K) gas in many sources
Fractional processes: from Poisson to branching one
Fractional generalizations of the Poisson process and branching Furry process
are considered. The link between characteristics of the processes, fractional
differential equations and Levy stable densities are discussed and used for
construction of the Monte Carlo algorithm for simulation of random waiting
times in fractional processes. Numerical calculations are performed and limit
distributions of the normalized variable Z=N/ are found for both processes.Comment: 11 pages, 6 figure
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