John E. Anderson
A5050031000- Seismic Imaging and Inversion Techniques
- Seismic Waves and Analysis
- Electric Vehicles and Infrastructure
- Stellar, planetary, and galactic studies
- Galaxies: Formation, Evolution, Phenomena
- Geophysical Methods and Applications
- Advanced Battery Technologies Research
- Transportation and Mobility Innovations
- Remote Sensing in Agriculture
- Energy, Environment, and Transportation Policies
- Gamma-ray bursts and supernovae
- Hydraulic Fracturing and Reservoir Analysis
- Climate change and permafrost
- Remote Sensing and LiDAR Applications
- Public Administration and Political Analysis
- Astronomy and Astrophysical Research
- Environmental Impact and Sustainability
- Law and Political Science
- Hybrid Renewable Energy Systems
- Cryospheric studies and observations
- Analytical chemistry methods development
- Astrophysics and Star Formation Studies
- Sustainable Building Design and Assessment
- Biosensors and Analytical Detection
- Child Therapy and Development
Deutsches Zentrum für Luft- und Raumfahrt e. V. (DLR)
2016-2023
ExxonMobil (Germany)
2008-2022
Colorado School of Mines
1994-2022
United States Department of the Army
2004-2021
United States Army
2001-2021
DEVCOM Army Research Laboratory
2020-2021
ExxonMobil (United States)
1994-2019
United States Army Corps of Engineers
1991-2019
U.S. Army Engineer Research and Development Center
2006-2017
Berlin Heart (Germany)
2016
The Sloan Digital Sky Survey (SDSS) will provide the data to support detailed investigations of distribution luminous and nonluminous matter in universe: a photometrically astrometrically calibrated digital imaging survey π sr above about Galactic latitude 30° five broad optical bands depth g' ∼ 23 mag, spectroscopic approximately 106 brightest galaxies 105 quasars found photometric object catalog produced by survey. This paper summarizes observational parameters products SDSS serves as an...
The Sloan Digital Sky Survey (SDSS) is an imaging and spectroscopic survey that will eventually cover approximately one-quarter of the celestial sphere collect spectra ≈106 galaxies, 100,000 quasars, 30,000 stars, serendipity targets. In 2001 June, SDSS released to general astronomical community its early data release, roughly 462 deg2 including almost 14 million detected objects 54,008 follow-up spectra. were collected in drift-scan mode five bandpasses (u, g, r, i, z); our 95% completeness...
We describe the design, construction, and performance of Sloan Digital Sky Survey Telescope located at Apache Point Observatory. The telescope is a modified two-corrector Ritchey-Chretien design which has 2.5-m, f/2.25 primary, 1.08-m secondary, Gascoigne astigmatism corrector, one pair interchangeable highly aspheric correctors near focal plane, for imaging other spectroscopy. final ratio f/5. instrumented by wide-area, multiband CCD camera fiber-fed double spectrographs. Novel features...
In the course of its commissioning observations, Sloan Digital Sky Survey (SDSS) has produced one largest redshift samples galaxies selected from CCD images. Using 11,275 complete to r* = 17.6 over 140 deg2, we compute luminosity function in band a range -23 < M -16 (for h 1). The result is well-described by Schechter with parameters ϕ* (1.46 ± 0.12) × 10-2 h3 Mpc-3, M* -20.83 0.03, and α -1.20 0.03. implied density j ≈ (2.6 0.3) 108h L⊙ Mpc-3. We find that surface brightness selection...
We report the discovery of two well-defined tidal tails emerging from sparse remote globular cluster Palomar 5. These stretch out symmetrically to both sides in direction constant Galactic latitude and subtend an angle 26 on sky. The have been detected commissioning data Sloan Digital Sky Survey, providing deep five-color photometry a 25-wide band along equator. stars make up substantial part (~) current total population magnitude interval 19.5 ≤ i* 22.0. This reveals that is subject heavy...
Full-wavefield seismic inversion (FWI) estimates a subsurface elastic model by iteratively minimizing the difference between observed and simulated data. This process is extremely computationally intensive, with cost comparable to at least hundreds of prestack reverse-time depth migrations. When FWI applied using explicit time-domain or frequency-domain iterative-solver-based methods, simulations are performed for each seismic-source configuration individually. Therefore, proportional number...
This is the fourth paper in a series aimed at finding high-redshift quasars from five-color imaging data taken along Celestial Equator by SDSS. during its commissioning phase. In this paper, we use color-selected sample of 39 luminous presented Paper III to derive evolution quasar luminosity function over range 3.6
We present star count data from the Sloan Digital Sky Survey for 5.8 × 105 stars brighter than g' = 21 mag over 279 deg2 in two samples north and south of Galactic plane. Using these high-latitude (49° < |b| 64°) counts we determine Sun's distance midplane to be 27 ± 4 pc scale height old thin disk 330 3 pc. Because photometric accuracy large area sky coverage data, color-magnitude diagram clearly reveals a significant thick-disk population distinct color halo population. The position...
A sample of 4208 objects with magnitude 15 < g* 22 and colors main-sequence stars have been selected from 370 deg2 Sloan Digital Sky Survey (SDSS) commissioning observations. The data is two long, narrow stripes, each an opening angle greater than 60°, at Galactic latitudes 36° |b| 63° on the celestial equator. Relative photometric calibrations good to 2% consistent absolute photometry allows this uniform be treated statistically over large area. An examination sample's distribution shows...
We present observations of SDSSp J104433.04-012502.2, a luminous quasar at z = 5.80 discovered from Sloan Digital Sky Survey (SDSS) multicolor imaging data. This object was selected as an i'-band dropout object, with i* 21.8 ± 0.2 and z* 19.2 0.1. It has absolute magnitude M1450 -27.2 (H0 50 km s-1 Mpc-1, q0 0.5). The spectrum shows strong broad Lyα emission line, forest absorption lines mean continuum decrement DA 0.91 Lyman limit system 5.72. also O I Si IV similar to those quasars ≲ 5,...
We present an empirical investigation of the colors quasars in Sloan Digital Sky Survey (SDSS) photometric system. The sample studied includes 2625 with SDSS photometry: 1759 found during spectroscopic commissioning and follow-up observations on other telescopes, 50 matches to FIRST quasars, 573 from NASA Extragalactic Database, 243 two or more these sources. are distributed a 25 wide stripe centered celestial equator covering ∼529 deg2. Positions (accurate 02) magnitudes given for 898 known...
We present photometric and spectroscopic observations of 15 high-redshift quasars (z > 3.6) discovered from ∼140 deg2 five-color (u', g', r', i', z') imaging data taken by the Sloan Digital Sky Survey (SDSS) during its commissioning phase. The are selected their distinctive colors in SDSS multicolor space. Four have redshifts higher than 4.6 = 4.63, 4.75, 4.90, 5.00, latter being highest redshift quasar yet known). In addition, two previously known z 4 objects were recovered data. all i* <...
A 2D finite-difference, frequency-domain method was developed for modeling viscoacoustic seismic waves in transversely isotropic media with a tilted symmetry axis. The medium is parameterized by the P-wave velocity on axis, density, attenuation factor, Thomsen’s anisotropic parameters [Formula: see text] and text], tilt angle. finite-difference discretization relies parsimonious mixed-grid approach that designs accurate yet spatially compact stencils. system of linear equations resulting...
Time-domain seismic simulation can form the basis of reverse time depth migration and full-waveform inversion. These applications need to temporally crosscorrelate a forward state with an adjoint therefore be able access each step in time-reverse order. This requires saving all states for times (which require more memory than is typically available on computer system many problems interest), or ability checkpoint information rapidly recompute as needed. Prior work has suggested how do latter...
Abstract. Permafrost underlies one-quarter of the Northern Hemisphere but is at increasing risk thaw from climate warming. Recent studies across Arctic have identified areas rapid permafrost degradation both top-down and lateral thaw. Of particular concern thawing syngenetic “yedoma” which ice-rich has a high carbon content. This type common in region around Fairbanks, Alaska, central Alaska expanding westward to Seward Peninsula. A major knowledge gap relating belowground measurements...
We discuss optical and infrared photometric properties of stars matched in the Two Micron All Sky Survey (2MASS) Sloan Digital (SDSS) commissioning data for ∼50 deg2 sky along celestial equator centered at l = 150°, b -60°. About 98% (∼63,000) objects listed 2MASS Point Source Catalog analyzed area are within 2'' to an SDSS source. The sources represent 8% ∼800,000 this area. They predominantly red sources, as expected, 15% them resolved imaging although they detected point data....
This is the third paper in a series aimed at finding high-redshift quasars from five-color (u′g′r′i′z′) imaging data taken along celestial equator by Sloan Digital Sky Survey (SDSS) during its commissioning phase. In this paper, we first present observations of 14 bright, (3.66 ≤ z 4.77, i* ≲ 20) discovered SDSS fall equatorial stripe, and photometry two previously known same region sky. Combined with presented Paper I Schneider et al., define color-selected flux-limited sample 39 3.6 < 5.0...
PAGE is a computer simulation model developed in 1992 for policy analysis of the global warming problem. This paper surveys key developments understanding problem that have occurred since 1992. For example, anthropogenic sulphates been found to significant cooling effect. Halocarbons, once thought be most potent greenhouse gases, are now believed only slight effect because they destroy ozone, itself strong gas. Furthermore, case studies various regions world improved our ability predict...
The high cost of simulating densely sampled seismic forward modeling data arises from activating sources one at a time in sequence. To increase efficiency, could leverage recent innovations field-data acquisition and activate several (e.g., 2–6) simultaneously during modeling. However, such approaches would suffer degraded quality because the interference between model’s responses to simultaneous sources. Two new efficient simultaneous-source are proposed that rely on novel tandem use...
Electric vehicles offer a means to achieve environmental goals within personal passenger transportation. However, one central challenge in transitioning electric remains the lack of adequate public charging infrastructure. In this paper, we address by focusing on user preferences for We present new insights from survey 843 vehicle users Germany regarding their The online allowed locate additional stations required use and define characteristics each station: power, location description,...