4,004 research outputs found
Particle size measurements using diffusion broadening spectroscopy
Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/77135/1/AIAA-1980-21-202.pd
Two units in American history for use in grade XII
Thesis (M.A.)--Boston University, 1948. This item was digitized by the Internet Archive
The Electric Fields and "Lightning Jets" of the Sun and Solar Wind
A model of electric energization of the Solar Wind and Corona is developed,
including electro-magnetic (EM) particle effects precluded by traditional
magneto-hydro (MHD) assumptions. Using standard 1-D radial Solar models for
particle density and temperature, the Core gravito-electric field is
calculated; and the range of possible Photospheric photoelectric fields is
estimated. These DC fields plausibly arise from about 500.Coulombs of charge
displacement, mainly caused by the immense Solar energy flux pushing electrons
outward. Energetically, these electric fields can accelerate surface protons
out of the 2.keV gravity well and up to the 4. keV energies observed in the
Fast Solar Wind. The electrical energy is released in pervasive, persistent
"proton lightning jets", which are proton beams, charge-neutralized by
co-propagating electrons. The jets are formed by pinched "avalanche breakdown"
of resistivity, probably initiated on the down-welling edges of Solar surface
granulations. These energetic jets will glow as discrete filamentary surface
spicules, and will be observed in reflect solar light as the diffuse K-Corona.
Significantly, the electric model exposes a new "virial limit": the observed
Fast Wind speed occurs when the (positive) electrical potential energy at r=0
is as large as the 10.keV gravitational well at r=0.Comment: 24 pages, 6 figure
Thermally excited Trivelpiece–Gould modes as a pure electron plasma temperature diagnostic
Thermally excited plasma modes are observed in trapped, near-thermal-equilibrium pure electron plasmas over a temperature range of 0.05<kT<5 eV. The modes are excited and damped by thermal fluctuations in both the plasma and the receiver electronics. The thermal emission spectra together with a plasma-antenna coupling coefficient calibration uniquely determine the plasma (and load) temperature. This calibration is obtained from the mode spectra themselves when the receiver-generated noise absorption is measurable; or from separate wave reflection/absorption measurements; or from kinetic theory. This nondestructive temperature diagnostic agrees well with standard diagnostics, and may be useful for expensive species such as antimatter
Thermally excited fluctuations as a pure electron plasma temperature diagnostic
Thermally excited charge fluctuations in pure electron plasma columns provide a diagnostic for the plasma temperature over a range of 0.05 0.2, so that Landau damping is dominant and well modeled by theory. The third method compares the total (frequency-integrated) number delta N of fluctuating image charges on the wall antenna to a simple thermodynamic calculation. This method works when lambda(D)/R-p > 0.2
Inventory of forest and rangeland resources, including forest stress
The author has identified the following significant results. Road systems being developed within the Manitou, Colorado area for human habitation are readily discernible on the S192 normal-color photographs. These are dirt roads, some of which are about 20 feet wide. These data should provide the District Ranger of the Pike National Forest required information on the size and extent of these developing areas, information which he does not now have but is required for total management of the District
Inventory of forest and rangeland resources, including forest stress
There are no author-identified significant results in this report
Inventory of forest and rangeland resources, including forest stress
There are no author-identified significant results in this report
Inventory of forest and rangeland resources, including forest stress
There are no author-identified significant results in this report
Inventory of forest and rangeland resources, including forest stress
There are no author-identified significant results in this report
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