A5048317693- Twentieth Century Scientific Developments
- Stellar, planetary, and galactic studies
- Astronomy and Astrophysical Research
- Astronomical Observations and Instrumentation
- Nuclear reactor physics and engineering
- Nuclear Issues and Defense
- International Science and Diplomacy
- Nuclear Physics and Applications
- Quantum Mechanics and Applications
- History and Developments in Astronomy
- Nuclear physics research studies
- Nuclear and radioactivity studies
- Experimental and Theoretical Physics Studies
- Field-Flow Fractionation Techniques
- Radioactive contamination and transfer
- Graphite, nuclear technology, radiation studies
- Research, Science, and Academia
- Radioactive Decay and Measurement Techniques
- Scientific Research and Discoveries
- Adaptive optics and wavefront sensing
- Geophysics and Gravity Measurements
- History and advancements in chemistry
- Quantum Mechanics and Non-Hermitian Physics
- Atmospheric Ozone and Climate
- Cold Fusion and Nuclear Reactions
Alma College
2015-2024
University of New Mexico
2023
Collège d'Alma
2020
University of Montana
2014
South Carolina State University
2014
University of Waterloo
1981-1993
Saint Mary's University
1985-1992
St Mary's University College
1988
St. Mary's University
1987
An all-sky catalog of Galactic OB stars has been created by extending the Case-Hamburg plane luminous-stars surveys to include 5500 additional objects drawn from literature. This work brings total number known or reasonably suspected over 16,000. Companion databases UBVβ photometry and MK classifications for these nearly 30,000 20,000 entries, respectively.
York’s solution to the problem of linear least-squares fits with errors in both coordinates [D. York, Can. J. Phys. 44, 1079 (1966)] is shown be exact and not subject erroneous results that attempts modify standard algorithms can produce. Detailed examples use method are given; a fortran implementation suitable for on personal computers available interested parties.
We cross-match the Alma catalog of OB stars with Gaia DR2 astrometry and photometry as a first step towards producing clean sample massive in solar neighbourhood high degree completeness. analyze resulting colour-absolute magnitude diagram to divide our into categories compare extinction estimates from two sources, finding problems both them. The distances obtained three different priors are found have few differences among them, indicating that robust. An analysis 3-D distribution is...
Corrected expressions for parameter variances in linear (straight-line) least-squares fits given an earlier paper [B. C. Reed, Am. J. Phys. 57, 642–646 (1989)] are presented and discussed. In addition, some simplifications to the solution that presented, comments made as role of weighting.
Galactic latitudes and photographic magnitudes for large samples (N ∼ 2000–4000) of OB stars within 10° the plane 4 kpc Sun are used to estimate exponential scale height surface density these objects assuming a barometric extinction model. Depending upon differential absorbing layer, estimates OB-star hOB vary from 25 65 pc 6 80 per 105 pc2. Reasons wide spread in this latter figure discussed. For an layer σ = 100 B-band 2 mag kpc-1, we find 45 26 The total population is estimated at 60,000,...
The reduction of photoelectric photometry data is examined, and a method which differs significantly from Hardie's (1966) traditional approach reviewed. Consisting multilinear solution for all transformation model parameters, the technique suitable modern computing facilities. Programs broad-band intermediate-band systems, mathematical solutions, generalizations are presented, with most general situation being on different telescopes nights. Sample results given to illustrate multinight...
Observed integrated colors, spectral types, and E(B-V) color excesses for 50 Galactic globular clusters are used to calibrate the relationship between intrinsic UBVRI colors types. Color then estimated from Reed's averages of observed (B-V) 93 with types on Hesser Shawl system. The authors find that R I add little reddening information. Mean five spectral-type groupings presented. Clusters latest type (i.e., most metal rich) particularly easy identify in (U-V)0, (V-I)0 diagram. Distributions...
The birthrate of stars masses ⩾10 M⊙ is estimated from a sample just over 400 O3–B2 dwarfs within 1.5 kpc the Sun and result extrapolated to estimate Galactic supernova rate contributed by such stars. solar-neighborhood Galactic-plane massive star at ∼176 kpc-3 Myr-1. On basis model in which stellar density distribution comprises "disk+central hole" like that dust infrared emission (as proposed Drimmel Spergel), probably not less than ∼1 nor more ∼2 per century number solar circle ∼200,000.
40Ar/39Ar detrital sanidine (DS) dating of river terraces provides new insights into the evolution and bedrock incision history San Juan River, a major tributary Colorado USA, at million-year time scale. We dated terrace flights from Juan−Colorado River confluence to Rocky Mountains. report >5700 40Ar/ 39Ar dates on single DS grains axial facies within several meters above straths 30 individual terraces; these yielded ∼2.5% young (<2 Ma) that constrain maximum depositional ages...
Abstract The question of possibly igniting a fusion chain reaction in the atmosphere by detonating nuclear weapons is analysed with some basic concepts physics and order-of-magnitude estimates. This scenario shown to be impossible any realistic situation.
A database of photoelectric UBVβ photometry for stars listed in the Case-Hamburg northern and southern Milky Way luminous surveys has been compiled from original research literature. Consisting over 16,000 observations some 7300 500 sources, this constitutes most complete compilation such available intrinsically around Galactic plane. Over 5000 still lack fundamental photometric data.
Introduction and Overview.- A Short History of Nuclear Physics to the Mid-1930s.- The Discovery Interpretation Fission.- Organizing Manhattan Project, 1939-1943.- Oak Ridge, CP-1, Clinton Engineer Works.- Hanford Los Alamos, Trinity, Tinian.- Hiroshima Nagasaki.- Legacy Manhattan.- Glossary.