162 research outputs found
Scott\u27s Addition Green Space Plan: Small Changes Making a Big Impact
Scottβs Addition is a fast growing, postindustrial neighborhood situated on the north side of West Broad street and bordering Henrico county to the west. The current building stock in Scottβs Addition consists of industrial and manufacturing buildings, and warehouses, much of which have been converted into multi-family residential buildings, commercial businesses, office and restaurant space (Neighborhood History, 2018). As a consequence of its original land use and zoning most of Scottβs Addition is dominated by concrete surface area and sprawling, one to two story building structures. Adaptive reuse of existing buildings has brought new investment and residents into the neighborhood however, the landscape has largely stayed the same.
Most of Scottβs Addition is dominated by impervious surfaces including flat roofs, parking lots, and wide streets that directly contribute to increased urban heat. There is a direct correlation between a reduced latent heat production and green infrastructure or urban tree canopy coverage. This design plan provides the framework for implementation of small scale green space projects by businesses on private property and can be the catalyst for a neighborhood-wide green transformation in the Scottβs Addition neighborhood
Indexing Irises by Intrinsic Dimension
28,000+ high-quality iris images of 1350 distinct eyes from 650+ different
individuals from a relatively diverse university town population were
collected. A small defined unobstructed portion of the normalized iris image is
selected as a key portion for quickly identifying an unknown individual when
submitting an iris image to be matched to a database of enrolled irises of the
1350 distinct eyes. The intrinsic dimension of a set of these key portions of
the 1350 enrolled irises is measured to be about four (4). This set is mapped
to a four-dimensional intrinsic space by principal components analysis (PCA).
When an iris image is presented to the iris database for identification, the
search begins in the neighborhood of the location of its key portion in the 4D
intrinsic space, typically finding a correct identifying match after comparison
to only a few percent of the database.Comment: 5 pages, 6 figure
Harmonics generation in electron-ion collisions in a short laser pulse
Anomalously high generation efficiency of coherent higher field-harmonics in
collisions between {\em oppositely charged particles} in the field of
femtosecond lasers is predicted. This is based on rigorous numerical solutions
of a quantum kinetic equation for dense laser plasmas which overcomes
limitations of previous investigations.Comment: 4 pages, 4 eps-figures include
Enhanced inverse bremsstrahlung heating rates in a strong laser field
Test particle studies of electron scattering on ions, in an oscillatory
electromagnetic field have shown that standard theoretical assumptions of small
angle collisions and phase independent orbits are incorrect for electron
trajectories with drift velocities smaller than quiver velocity amplitude. This
leads to significant enhancement of the electron energy gain and the inverse
bremsstrahlung heating rate in strong laser fields. Nonlinear processes such as
Coulomb focusing and correlated collisions of electrons being brought back to
the same ion by the oscillatory field are responsible for large angle, head-on
scattering processes. The statistical importance of these trajectories has been
examined for mono-energetic beam-like, Maxwellian and highly anisotropic
electron distribution functions. A new scaling of the inverse bremsstrahlung
heating rate with drift velocity and laser intensity is discussed.Comment: 12 pages, 12 figure
Diamond-max ceramics bonding phase composites β phases and microstructure analysis
The possibility for improving the thermal stability of polycrystalline materials based on diamond (PCD) is to reduce the content of cobalt. Diamond compacts without cobalt phases with Ti3βiCβ Ρ CrβAlC prepared using the method of self-propagating high-temperature synthesis (SHS). The resulting compacts with 20 wt. % of the above phases were exposed to high pressure and temperature in order to further consolidate the structure by sintering. Sintering was performed at 8Β±0.2 GPa and 1950Β±50 Β°C. Phase composition and microstructural study of the original compacts and the composites made by X-ray diffraction (XRD) and scanning electron microscopy (SEM).ΠΠ΄Π½Π° Π· ΠΌΠΎΠΆΠ»ΠΈΠ²ΠΎΡΡΠ΅ΠΉ ΠΏΡΠ΄Π²ΠΈΡΠ΅Π½Π½Ρ ΡΠ΅ΡΠΌΠΎΡΡΡΠΉΠΊΠΎΡΡΡ ΠΏΠΎΠ»ΡΠΊΡΠΈΡΡΠ°Π»ΡΡΠ½ΠΈΡ
ΠΌΠ°ΡΠ΅ΡΡΠ°Π»ΡΠ² Π½Π° ΠΎΡΠ½ΠΎΠ²Ρ Π°Π»ΠΌΠ°Π·Ρ (PCD) ΠΏΠΎΠ»ΡΠ³Π°Ρ Π² Π·ΠΌΠ΅Π½ΡΠ΅Π½Π½Ρ Π²ΠΌΡΡΡΡ Π² Π½ΠΈΡ
ΠΊΠΎΠ±Π°Π»ΡΡΡ. ΠΠ»ΠΌΠ°Π·Π½Ρ ΠΊΠΎΠΌΠΏΠ°ΠΊΡΠΈ Π±Π΅Π· ΠΊΠΎΠ±Π°Π»ΡΡΡ Π· ΡΠ°Π·Π°ΠΌΠΈ Ti3βiCβ Ρ CrβAlC ΠΎΡΡΠΈΠΌΡΠ²Π°Π»ΠΈ Π· Π²ΠΈΠΊΠΎΡΠΈΡΡΠ°Π½Π½ΡΠΌ ΠΌΠ΅ΡΠΎΠ΄Ρ ΡΠ°ΠΌΠΎ ΠΏΠΎΡΠΈΡΡΠ²Π°Π½ΠΎΠ³ΠΎ Π²ΠΈΡΠΎΠΊΠΎΡΠ΅ΠΌΠΏΠ΅ΡΠ°ΡΡΡΠ½ΠΎΠ³ΠΎ ΡΠΈΠ½ΡΠ΅Π·Ρ (SHS). ΠΡΡΠΈΠΌΠ°Π½Ρ ΠΊΠΎΠΌΠΏΠ°ΠΊΡΠΈ Π· 20 ΠΌΠ°Ρ. % Π·Π°Π·Π½Π°ΡΠ΅Π½ΠΈΡ
ΡΠ°Π· ΠΏΡΠ΄Π΄Π°Π²Π°Π»ΠΈ Π΄ΡΡ Π²ΠΈΡΠΎΠΊΠΎΠ³ΠΎ ΡΠΈΡΠΊΡ Ρ ΡΠ΅ΠΌΠΏΠ΅ΡΠ°ΡΡΡΠΈ Π· ΠΌΠ΅ΡΠΎΡ ΠΏΠΎΠ΄Π°Π»ΡΡΠΎΡ ΠΊΠΎΠ½ΡΠΎΠ»ΡΠ΄Π°ΡΡΡ ΡΡΡΡΠΊΡΡΡΠΈ ΡΠ»ΡΡ
ΠΎΠΌ ΡΠΏΡΠΊΠ°Π½Π½Ρ. ΠΡΠΎΡΠ΅Ρ ΡΠΏΡΠΊΠ°Π½Π½Ρ Π·Π΄ΡΠΉΡΠ½ΡΠ²Π°Π»ΠΈ ΠΏΡΠΈ 8 Β± 0,2 ΠΠΠ° ΠΈ 1950 Β± 50 Β°Π‘. Π€Π°Π·ΠΎΠ²ΠΈΠΉ ΡΠΊΠ»Π°Π΄ Ρ ΠΌΡΠΊΡΠΎΡΡΡΡΠΊΡΡΡΠ½Ρ Π΄ΠΎΡΠ»ΡΠ΄ΠΆΠ΅Π½Π½Ρ Π²ΠΈΡ
ΡΠ΄Π½ΠΈΡ
ΠΊΠΎΠΌΠΏΠ°ΠΊΡΡΠ² Ρ ΠΎΡΡΠΈΠΌΠ°Π½ΠΈΡ
ΠΊΠΎΠΌΠΏΠΎΠ·ΠΈΡΡΠ² Π²ΠΈΠΊΠΎΠ½Π°Π½Ρ ΠΌΠ΅ΡΠΎΠ΄Π°ΠΌΠΈ ΡΠ΅Π½ΡΠ³Π΅Π½ΡΠ²ΡΡΠΊΠΎΡ Π΄ΠΈΡΡΠ°ΠΊΡΠΎΠΌΠ΅ΡΡΡΡ (XRD) Ρ ΡΠΊΠ°Π½ΡΡΡΠΎΡ Π΅Π»Π΅ΠΊΡΡΠΎΠ½Π½ΠΎΡ ΠΌΡΠΊΡΠΎΡΠΊΠΎΠΏΡΡ (SEM).ΠΠ΄Π½Π° ΠΈΠ· Π²ΠΎΠ·ΠΌΠΎΠΆΠ½ΠΎΡΡΠ΅ΠΉ ΠΏΠΎΠ²ΡΡΠ΅Π½ΠΈΡ ΡΠ΅ΡΠΌΠΎΡΡΠΎΠΉΠΊΠΎΡΡΠΈ ΠΏΠΎΠ»ΠΈΠΊΡΠΈΡΡΠ°Π»Π»ΠΈΡΠ΅ΡΠΊΠΈΡ
ΠΌΠ°ΡΠ΅ΡΠΈΠ°Π»ΠΎΠ² Π½Π° ΠΎΡΠ½ΠΎΠ²Π΅ Π°Π»ΠΌΠ°Π·Π° (PCD) Π·Π°ΠΊΠ»ΡΡΠ°Π΅ΡΡΡ Π² ΡΠ½ΠΈΠΆΠ΅Π½ΠΈΠΈ ΡΠΎΠ΄Π΅ΡΠΆΠ°Π½ΠΈΡ Π² Π½ΠΈΡ
ΠΊΠΎΠ±Π°Π»ΡΡΠ°. ΠΠ»ΠΌΠ°Π·Π½ΡΠ΅ ΠΊΠΎΠΌΠΏΠ°ΠΊΡΡ Π±Π΅Π· ΠΊΠΎΠ±Π°Π»ΡΡΠ° Ρ ΡΠ°Π·Π°ΠΌΠΈ Ti3βiCβ ΠΈ CrβAlC ΠΏΠΎΠ»ΡΡΠ°Π»ΠΈ Ρ ΠΈΡΠΏΠΎΠ»ΡΠ·ΠΎΠ²Π°Π½ΠΈΠ΅ΠΌ ΠΌΠ΅ΡΠΎΠ΄Π° ΡΠ°ΠΌΠΎΡΠ°ΡΠΏΡΠΎΡΡΡΠ°Π½ΡΡΡΠ΅Π³ΠΎΡΡ Π²ΡΡΠΎΠΊΠΎΡΠ΅ΠΌΠΏΠ΅ΡΠ°ΡΡΡΠ½ΠΎΠ³ΠΎ ΡΠΈΠ½ΡΠ΅Π·Π° (SHS). ΠΠΎΠ»ΡΡΠ΅Π½Π½ΡΠ΅ ΠΊΠΎΠΌΠΏΠ°ΠΊΡΡ Ρ 20 % ΠΏΠΎ ΠΌΠ°Ρ. ΡΠΊΠ°Π·Π°Π½Π½ΡΡ
ΡΠ°Π· ΠΏΠΎΠ΄Π²Π΅ΡΠ³Π°Π»ΠΈ Π²ΠΎΠ·Π΄Π΅ΠΉΡΡΠ²ΠΈΡ Π²ΡΡΠΎΠΊΠΎΠ³ΠΎ Π΄Π°Π²Π»Π΅Π½ΠΈΡ ΠΈ ΡΠ΅ΠΌΠΏΠ΅ΡΠ°ΡΡΡΡ Ρ ΡΠ΅Π»ΡΡ Π΄Π°Π»ΡΠ½Π΅ΠΉΡΠ΅ΠΉ ΠΊΠΎΠ½ΡΠΎΠ»ΠΈΠ΄Π°ΡΠΈΠΈ ΡΡΡΡΠΊΡΡΡΡ ΠΏΡΡΠ΅ΠΌ ΡΠΏΠ΅ΠΊΠ°Π½ΠΈΡ. ΠΡΠΎΡΠ΅ΡΡ ΡΠΏΠ΅ΠΊΠ°Π½ΠΈΡ ΠΎΡΡΡΠ΅ΡΡΠ²Π»ΡΠ»ΠΈ ΠΏΡΠΈ 8 Β± 0,2 ΠΠΠ° ΠΈ 1950 Β± 50 Β°Π‘. Π€Π°Π·ΠΎΠ²ΡΠΉ ΡΠΎΡΡΠ°Π² ΠΈ ΠΌΠΈΠΊΡΠΎΡΡΡΡΠΊΡΡΡΠ½ΡΠ΅ ΠΈΡΡΠ»Π΅Π΄ΠΎΠ²Π°Π½ΠΈΡ ΠΈΡΡ
ΠΎΠ΄Π½ΡΡ
ΠΊΠΎΠΌΠΏΠ°ΠΊΡΠΎΠ² ΠΈ ΠΏΠΎΠ»ΡΡΠ΅Π½Π½ΡΡ
ΠΊΠΎΠΌΠΏΠΎΠ·ΠΈΡΠΎΠ² Π²ΡΠΏΠΎΠ»Π½Π΅Π½Ρ ΠΌΠ΅ΡΠΎΠ΄Π°ΠΌΠΈ ΡΠ΅Π½ΡΠ³Π΅Π½ΠΎΠ²ΡΠΊΠΎΠΉ Π΄ΠΈΡΡΠ°ΠΊΡΠΎΠΌΠ΅ΡΡΠΈΠΈ (XRD) ΠΈ ΡΠΊΠ°Π½ΠΈΡΡΡΡΠ΅ΠΉ ΡΠ»Π΅ΠΊΡΡΠΎΠ½Π½ΠΎΠΉ ΠΌΠΈΠΊΡΠΎΡΠΊΠΎΠΏΠΈΠΈ (SEM)
Thomson scattering from high-temperature high-density plasmas revisited
The theory of Thomson scattering from high-temperature high-density plasmas
is revisited from the view point of plasma fluctuation theory. Three subtle
effects are addressed with a unified theory. The first is the correction of the
first order of , where is the particle velocity and is the light
speed, the second is the plasma dielectric effect, and the third is the finite
scattering volume effect. When the plasma density is high, the first effect is
very significant in inferring plasma parameters from the scattering spectra off
electron plasma waves. The second is also be notable but less significant. When
the size of the scattering volume is much larger than the probe wavelength, the
third is negligible.Comment: 16 pages, 2 figures, submitted to Plasma Physics and Controlled
Fusio
Diagnosing collisions of magnetized, high energy density plasma flows using a combination of collective Thomson scattering, Faraday rotation, and interferometry
Experimental investigations of ablation stream interaction dynamics in tungsten wire arrays: interpenetration, magnetic field advection, and ion deflection
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