A5012878460- Astronomical Observations and Instrumentation
- Astrophysical Phenomena and Observations
- Stellar, planetary, and galactic studies
- Gamma-ray bursts and supernovae
- Teaching and Learning Programming
- Astronomy and Astrophysical Research
- Adaptive optics and wavefront sensing
- CCD and CMOS Imaging Sensors
- Astrophysics and Cosmic Phenomena
- Gender and Technology in Education
- Infrared Target Detection Methodologies
- Migration, Health and Trauma
- Educational Assessment and Improvement
- Experimental Learning in Engineering
- Scientific Computing and Data Management
- Advanced Measurement and Metrology Techniques
- Child Development and Digital Technology
- X-ray Spectroscopy and Fluorescence Analysis
- Molecular Junctions and Nanostructures
- Satellite Image Processing and Photogrammetry
- Galaxies: Formation, Evolution, Phenomena
- History and Developments in Astronomy
- Optical Coatings and Gratings
- Particle Detector Development and Performance
- Career Development and Diversity
Chicago Public Schools
2017-2024
SLAC National Accelerator Laboratory
2010-2024
Kavli Institute for Particle Astrophysics and Cosmology
2008-2024
Stanford University
2007-2024
University of Illinois Chicago
2016-2018
British Exploring Society
2018
Loyola University Chicago
2018
Mount St. Joseph University
2017
Northwestern University
2012-2015
University of Georgia
2010
Abstract We describe the simulated sky survey underlying second data challenge (DC2) carried out in preparation for analysis of Vera C. Rubin Observatory Legacy Survey Space and Time (LSST) by LSST Dark Energy Science Collaboration (LSST DESC). Significant connections across multiple science domains will be a hallmark LSST; DC2 program represents unique modeling effort that stresses this interconnectivity way has not been attempted before. This encompasses full end-to-end approach: starting...
We report on the observation of OVII Doppler line broadening in a compact knot at edge SN 1006 detected with Reflective Grating Spectrometer board XMM-Newton. The observed width sigma = 3.4+/-0.5 eV energy 574 indicates an oxygen temperature kT 528+/-150 keV. Combined electron 1.5 keV is direct evidence for non-equilibration high Mach number shocks, and slow subsequent equilibration. emission allows accurate determination ionization state plasma, which characterized by relatively forbidden...
Displacement of native octylphosphonate (OPA) ligands for methylthiophenolate (CH3-TP) on the surfaces CdSe quantum dots (QDs) causes a moderate (up to 50 meV) decrease in band gap (Eg) QD. Plots corresponding increase apparent excitonic radius, ΔR, QDs versus surface coverage CH3-TP, measured by 1H NMR, several sizes reveal that this ligand adsorbs two distinct binding modes, (1) tightly bound mode (Ka = 1.0 ± 0.3 × 104 M–1) capable exciton delocalization, and (2) more weakly 8.3 9.9 102...
While several introductory computer science curricula exist for children in K-8, there are few options that go beyond sequence, loops, and basic conditionals. The goal of this project is to not only fill gap with a high-quality curriculum supported by complete instructional materials, but also do so an equity-balanced curriculum. That is, values advancing equity equally student learning outcomes. In paper, we introduce barriers public school classrooms, pedagogical approaches...
Ultrafast transient absorption measurements reveal that the rate of photoinduced electron transfer (PET) from colloidal CdSe quantum dots (QDs) to oxo-centered triruthenium clusters (Ru3O) depends on structure chemical headgroup by which Ru3O adsorb QDs. Complexes comprising QDs and adsorbed through a pyridine-4-carboxylic acid ligand (nic-Ru3O) have an intrinsic PET constant (4.9 ± 0.9) × 109 s−1 whereas complexes 4-mercaptopyridine (thiol-Ru3O) (36 7) s−1. Cyclic voltammetry nic-Ru3O...
Extracting science from the LSST data stream requires a detailed knowledge of properties catalogs and images (from their detection limits to accuracy calibration how well galaxy shapes can be characterized). These will depend on many components including design telescope, conditions under which are taken overall survey strategy. To understand these impact nature simulations group is developing framework for high fidelity that scale volume expected LSST. This comprises galaxy, stellar solar...
This study investigated patterns in the development of computational thinking practices context Exploring Computer Science (ECS) program, a high school introductory CS course and professional program designed to foster deep engagement through equitable inquiry around concepts. Past research indicates that personal relevance ECS experience influences students' expectancy-value towards computer science. Expectancy-value is construct predictive career choices. We extended our examine whether...
The LSST Camera science sensor array will incorporate 189 large format Charge Coupled Device (CCD) image sensors. Each CCD include over 16 million pixels and be divided into equally sized segments each segment read through a separate output amplifier. goals of the project require sensors with state art performance in many aspects. broad survey wavelength coverage requires fully depleted, 100 micrometer thick, high resistivity, bulk silicon as imager substrate. Image quality requirements...
A series of pseudosymmetrical structures formula K10(M2OnF11-n)3X (M = V and Nb, n 2, X (F2Cl)1/3, Br, Br4/2,I4/2; M Mo, 4, Cl, Br4/2, I4/2) illustrates generation polar with the use Λ-shaped basic building units (BBUs). For a compound to belong space group, dipole moments individual species must be partially aligned. Incorporation d(0) early transition metal polyhedral BBUs into is common method create structures, owing second-order Jahn-Teller distortion these polyhedra contain. Less...
The reported study investigated the impact of Exploring Computer Science (ECS) program on likelihood that students all races and genders would pursue further computer science coursework in high school. ECS is designed to foster deep engagement through equitable inquiry around concepts. course provides experiences are personally relevant. Using survey research, authors sought measure whether personal relevance students' influenced their expectancies success value for field those attitudes...
Given the current limited knowledge of meteor plasma micro-physics and its interaction with surrounding atmosphere ionosphere, meteors are a highly interesting observational target for high-resolution wide-field astronomical surveys. Such surveys capable resolving physical size heads, but they produce large volumes images that need to be automatically inspected possible existence long linear features produced by meteors. Here we show how big aperture sky survey telescopes detect as defocused...
Abstract The Vera C. Rubin Observatory’s LSST Camera (LSSTCam) pixel response has been characterized using laboratory measurements with a grid of artificial stars. We quantify the contributions to photometry, centroid, point-spread function size, and shape measurement errors due small anomalies in LSSTCam CCDs. main sources those are quantum efficiency variations area induced by amplifier segmentation boundaries “tree-rings”—circular silicon doping concentration. This study stars projected...
We present a spectrometer design based on novel nanofabricated blazed X-ray transmission grating which is modeled to have superior efficiency. Here we outline full instrument proposed for Constellation-X expected give resolving powers ~2000 (HEW). The advantages include lower mass budget and smaller diffractor area, as well order-of-magnitude more relaxed alignment tolerances crucial degrees of freedom than reflection schemes considered in the past<sup>1</sup>,<sup>2</sup>,<sup>3</sup>....
Near-future astronomical survey experiments, such as LSST, possess system requirements of unprecedented fidelity 1 that span photometry, astrometry and shape transfer.Some these flow directly to the array science imaging sensors at focal plane.Availability high quality characterization data acquired in course our sensor development program has given us an opportunity develop test a framework for simulation modeling is based on limited set physical geometric effects.In this paper we describe...
This study investigated patterns in the development of computational thinking and programming expertise context Exploring Computer Science (ECS) program, a high school introductory CS course professional program designed to foster deep engagement through equitable inquiry around concepts. Prior research on has identified three general areas --- comprehension, planning, generation. The pedagogical practices ECS are consistent with problem solving approaches that support expertise. took place...
The Integration and Verification Testing of the Large Synoptic Survey Telescope (LSST) Camera is described. LSST will be largest astronomical camera ever constructed, featuring a 3.2 giga-pixel focal plane mosaic 189 CCDs with in-vacuum controllers readout, dedicated guider wavefront CCDs, three element corrector 1.6-meter diameter initial optic, six optical filters covering wavelengths from 320 to 1000 nm novel filter exchange mechanism, camera-control data acquisition capable digitizing...
view Abstract Citations (19) References (24) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Global O VI Line Emission from the Cygnus Loop Supernova Remnant and Direct Kinematic Measurement of Associated Shock Rasmussen, Andrew ; Martin, Christopher A far-ultraviolet spectrophotometric emission-line mapping supernova remnant is presented. These are results first flight rocket-borne, High Resolution Spectrometer. The spatial distribution emission that a...
The effects of hydration on the lowest triplet states DNA/RNA pyrimidines have been studied by including one and two water molecules explicitly. Three configurations for singly hydrated cytosine moiety were located, six doubly system. For thymine uracil, four eight structures found. singlet-triplet energy gaps all three (cytosine, thymine, uracil) fall in low-energy range ultraviolet radiation (UVA). Energetic excited can be a step leading to lesions DNA, such as mismatched base pairs....
The LSST Camera focal plane comprises twenty-one raft tower modules (RTMs), each with nine CCD sensors and their associated electronics. RTMs are assembled at Brookhaven National Lab shipped to SLAC Lab, where they must be re-verified before being into the full plane. process for accepting an RTM has been thoroughly documented, including unpacking a from its shipping container, verifying aliveness of electrical connections, performing metrology electro-optical testing in environment similar...
How structures of various scales formed and evolved from the early Universe up to present time is a fundamental question astrophysics. EDGE will trace cosmic history baryons generations massive stars by Gamma-Ray Burst (GRB) explosions, through period galaxy cluster formation, down very low redshift Universe, when between third one half are expected reside in filaments undergoing gravitational collapse dark matter (the so-called warm hot intragalactic medium). In addition EDGE, with its...
Thick, fully depleted charge-coupled devices (CCDs) are known to exhibit non-linear behavior at high signal levels due the dynamic of charges collecting in potential wells pixels, called brighter-fatter effect (BFE). This particularly impacts bright calibration stars, which appear larger than their intrinsic shape, creating a flux-dependent point-spread function (PSF) that if left unmitigated, could make up large fraction error budget Stage IV weak-lensing (WL) surveys such as Legacy Survey...