cometadata/datacite-titles-descriptions-related-identifiers huggingface dataset:
DOI: 10.48577/jpl.umdzre
title: Electrically-driven Acousto-optics and Broadband Non-reciprocity in Silicon Photonics

description: Emerging technologies based on tailorable interactions between photons and phonons promise new capabilities ranging from high-fidelity microwave signal processing to nonlinear optics and quantum state control. While such light-sound couplings have been studied in a variety of physical systems, many implementations rely on nonstandard materials and fabrication schemes that are nontrivial to co-implement with standard integrated photonic circuitry. Notably, despite significant advances in integrated electro-optic modulators, related acousto-optic modulator concepts have remained relatively unexplored in silicon photonics. In this article, we demonstrate direct acousto-optic modulation within silicon photonic waveguides using electrically-driven surface acoustic waves (SAWs). Electromechanical transduction is achieved through co-integration of piezoelectric SAW transducers in aluminum nitride with a standard silicon-on-insulator optical waveguide platform. These electromechanical transducers emit surface acoustic waves that produce nonlocal light modulation in optical waveguides through silicon's strong elasto-optic effect. Through lithographic control, we separately demonstrate both acousto-optic phase modulation and single sideband amplitude modulation in the range of 1-5 GHz, with refractive index modulation strengths comparable to existing electro-optic technologies. Furthermore, these devices are leveraged to enable non-reciprocal modulation and routing over a 100 GHz optical bandwidth. The modulator design avoids suspended waveguide structures common in many optomechanical devices, and is compatible with both complementary metal–oxide–semiconductor (CMOS) fabrication processes, and with existing silicon photonic device technologies. These results represent a promising new approach to implement compact and scalable acousto-optic modulators, frequency-shifters, and optical isolators and circulators in integrated photonic circuits.
DOI: 10.48577/jpl.q0q1sg
title: Micro-Meteoroid and Orbital Debris Radar from Goldstone Radar Observations

description: Micro-meteoroid and orbital debris (MMOD) refers to millions of micrometeoroids and orbital debris orbiting the Earth, which can come from remaining parts of spacecraft from previous missions. These debris objects keep colliding and creating new pieces of debris, with very different sizes ranging from millimeters to meters. About 99.3% of the debris objects have a size &lt; 1 cm. These debris objects, traveling at speeds of 10 km/s, can cause significant damage to spacecraft, satellites, and astronauts. Despite the historic use of shielding to protect vital spacecraft components, MMOD still present a potential hazard for future missions and operations involving humans in space. Goldstone’s orbital debris radar (ODR) enhances the NASA orbital debris model with radar observation data, providing vital information on orbital debris detections: size, Doppler, range, and orbit inclination angle. These observations currently provide the only access to information about this size class (2 mm to 10 mm) of orbital debris. Goldstone’s ODR experiments operate as a bistatic radar, with overlapping beams providing a wide distribution of ranges. From 2004 to early 2018, Goldstone’s ODR has been collecting orbital debris data from altitudes covering 280 km to 3000 km. Since the decommissioning of the receive antenna in early 2018, Goldstone’s range coverage is reduced to a 300 km window within a 600 km to 1000 km potential range coverage, depending on the pointing geometry and antenna station used. We are investigating alternative transmit receive configurations at Goldstone to recover our previous wide range coverage.
DOI: 10.15468/dl.quk7jd
title: Occurrence Download

description: A dataset containing 36 species occurrences available in GBIF matching the query:
{
 "TaxonKey" : [
 "is Dendrobium pseudocalceolum J.J.Sm."
 ]
}

 The dataset includes 36 records from 11 constituent datasets; see https://api.gbif.org/v1/occurrence/download/0170039-230224095556074/datasets/export for details.
 
Data from some individual datasets included in this download may be licensed under less restrictive terms.
DOI: 10.25549/independent-c69-46230
title: Reports (1-2 of 3) - A review of administrative processes of the Tampa Police Department by the Police Foundation, 1988-11-18

description: Report: A review of administrative processes of the Tampa Police Department by the Police Foundation, 1988 November 18.
DOI: 10.48577/jpl.7n2iku
title: Morphology, Microstructure, and Phase States in Selective Laser Sintered Lithium Ion Battery Cathodes

description: Fabrication of high-energy cathode materials with complex geometries is necessary to enable high-power density in next-generation lithium ion batteries (LIBs). Ceramic three-dimensional (3D) printing techniques are one possible avenue to achieve high performance. Current ceramic 3D-printing methods often suspend the electrochemically active cathode powder in binders that require substantial rheological development to enable printability and secondary binder removal processes to ensure degradation does not occur during electrochemical cycling. In this study, the need for binder additives is circumvented by employing the laser-based 3D-printing technique, selective laser sintering (SLS), for direct fabrication of 3D lithium nickel cobalt aluminum oxide (NCA) cathodes. Thermal stress and part distortion are mitigated by using in-situ substrate heating while operating the 1.07 μm fiber laser in q-switched continuous mode. A parametric single-track study is performed to refine the process parameters for the layer-by-layer selective laser sintering of bulk 3D NCA samples. These bulk 3D samples are porous with 2−3 μm grains and exhibit a dual phase state, including the layered structure (with symmetry R-3 m) and rock salt structure (Fm-3 m). The retention of the electrochemically active layered structure in these samples is promising for the development of binder-free, 3D-printed cathodes for LIBs with enhanced power density.
DOI: 10.48577/jpl.cbhtlx
title: PLEIADES OR NOT? RESOLVING THE STATUS OF THE LITHIUM RICH M DWARFS HHJ339 AND HHJ430

description: Oppenheimer et al. (1997) discovered two M5 dwarfs in the Pleiades with nearly primordial lithium. These stars are not low enough in mass to represent the leading edge of the lithium depletion boundary at Pleiades age. A possible explanation for the enhanced lithium in these stars is that they are actually not members of the Pleiades but instead are members of a younger moving group seen in projection towards the Pleiades. We have used data from Gaia DR2 to confirm that these two stars, HHJ 339 and HHJ 430, are indeed not members of the Pleiades. Based on their space motions, parallaxes and positions in a Gaia-based CMD, it is probable that these two stars are about 40 parsecs foreground to the Pleiades and have ages of ∼25 Myr. Kinematically they are best matched to the 32 Ori moving group.
DOI: 10.15468/dl.ut1b4n
title: Occurrence Download

description: A dataset containing 1 species occurrences available in GBIF matching the query:
{
 "and" : [
 "TaxonKey is Sciadicleithrum Kritsky, Thatcher & Boeger, 1989",
 "Country is India"
 ]
}

 The dataset includes 1 records from 1 constituent datasets; see https://api.gbif.org/v1/occurrence/download/0001444-160803222355964/datasets/export for details.
 
Data from some individual datasets included in this download may be licensed under less restrictive terms.
DOI: 10.25549/independent-c69-44793
title: Attorney notes, 1991 Apr.-June

description: Collection of handwritten attorney notes, some with attached business cards (Sol Bernstein, Thomas W. Lorenzen, Charles M. Naumer, Philip A. Henning Jr.), with Los Angeles Police Department complaint database reports, phone message, 1991 April-June. PART OF A SERIES: The series relates to the work product of Sibley & Austin, whose staff contributed to the Commission's probe of excessive force allegations brought against the LAPD. Included in the series are memoranda, witness testimonies, interview summaries, copies of officers' background files, after-action summaries and reports, and notes taken by the firm. Materials relate to four major areas of study undertaken by the firm: the Justice for Janitors labor demonstration of 1990, the jail ward of County/USC Medical Center, Los Angeles city jails, and a review of the LAPD's Background Investigation Unit.
DOI: 10.48577/jpl.xkjynz
title: DEMONSTRATING HIGH-PRECISION PHOTOMETRY WITH A CUBESAT: ASTERIA OBSERVATIONS OF 55 CANCRI E

description: ASTERIA (Arcsecond Space Telescope Enabling Research In Astrophysics) is a 6U CubeSat space telescope (10 cm x 20 cm x 30 cm, 10 kg). ASTERIA's primary mission objective was demonstrating two key technologies for reducing systematic noise in photometric observations: high-precision pointing control and high-stabilty thermal control. ASTERIA demonstrated 0.5 arcsecond RMS pointing stability and +/-10 milliKelvin thermal control of its camera payload during its primary mission, a significant improvement in pointing and thermal performance compared to other spacecraft in ASTERIA's size and mass class. ASTERIA launched in August 2017 and deployed from the International Space Station (ISS) November 2017. During the prime mission (November 2017 -- February 2018) and the first extended mission that followed (March 2018 - May 2018), ASTERIA conducted opportunistic science observations which included collection of photometric data on 55 Cancri, a nearby exoplanetary system with a super-Earth transiting planet. The 55 Cancri data were reduced using a custom pipeline to correct CMOS detector column-dependent gain variations. A Markov Chain Monte Carlo (MCMC) approach was used to simultaneously detrend the photometry using a simple baseline model and fit a transit model. ASTERIA made a marginal detection of the known transiting exoplanet 55 Cancri e (~R_earth), measuring a transit depth of 374 +/- 170 ppm. This is the first detection of an exoplanet transit by a CubeSat. The successful detection of super-Earth 55 Cancri e demonstrates that small, inexpensive spacecraft can deliver high-precision photometric measurements.
DOI: 10.15468/dl.tkyfbw
title: Occurrence Download

description: A dataset containing 1060329 species occurrences available in GBIF matching the query:
{
 "and" : [
 "BasisOfRecord is Human Observation",
 "Country is Ecuador",
 "HasCoordinate is true",
 "HasGeospatialIssue is false",
 "TaxonKey is Aves",
 "Year 2013-2016"
 ]
}

 The dataset includes 1060329 records from 12 constituent datasets; see https://api.gbif.org/v1/occurrence/download/0013029-240202131308920/datasets/export for details.
 
Data from some individual datasets included in this download may be licensed under less restrictive terms.
DOI: 10.48577/jpl.tjbydz
title: ALMA Observations of the Inner Cavity in the Protoplanetary Disk around Sz 84

description: We present Atacama Large Millimeter/submillimeter Array (ALMA) observations of a protoplan- etary disk around the T Tauri star Sz 84 and analyses of the structures of the inner cavity in the central region of the dust disk. Sz 84's spectral energy distribution (SED) has been known to exhibit negligible infrared excess at .10 m due to the disk's cavity structure. Analyses of the observed visibilities of dust continuum at 1.3 mm and the SED indicate that the size of the cavity in the disk of large (millimeter size) dust grains is 8 au in radius and that in the disk of small (sub-micron size) dust grains is 60 au in radius. Furthermore, from the SED analyses, we estimate that the upper limit mass of small dust grains at r &lt;60 au is less than 10􀀀3 M, which is .0.01 % of the total (small + large) dust mass at r &lt;60 au. These results suggest that large dust grains are dominant at r &lt;60 au, im- plying that dust grains eciently grow with less ecient fragmentation in this region, potentially due to weak turbulence and/or stickier dust grains. The balance of grain growth and dust fragmentation is an important factor for determining the size of large dust grains in protoplanetary disks, and thus Sz 84 could serve as a good testbed for investigations of grain growth in such disks.
DOI: 10.48577/jpl.z9tzpv
title: Air quality response in China linked to the 2019 novel Coronavirus (COVID-19) mitigation

description: Efforts to stem the spread of COVID-19 in China hinged on severe restrictionsto human movement starting January 23rd, 2020 in Wuhan and subsequentlyto other provinces. Here, we quantify the ancillary impacts on air pollutionand human health using inverse emissions estimates based on multiple satellite observations. NOx and SO2 emission reductions increased surface ozoneby up to 16 ppb over northern China but decreased PM2.5 by up to 23 µg m−3nationwide. Air pollution appears to have substantially offset hospital admissions related to COVID-19, augmenting mitigation efforts, such as in the Hubeiprovince with ∼400 reduced admissions. Changes in human exposure are as1sociated with about 2,100 increased ozone-related morbidity incidences andavoidance of at least 60,000 PM2.5-related morbidity incidences.
DOI: 10.25549/independent-c69-44789
title: Attorney notes, 1991 Apr.-June

description: Collection of handwritten attorney notes, some with attached business cards (Sol Bernstein, Thomas W. Lorenzen, Charles M. Naumer, Philip A. Henning Jr.), with Los Angeles Police Department complaint database reports, phone message, 1991 April-June. PART OF A SERIES: The series relates to the work product of Sibley & Austin, whose staff contributed to the Commission's probe of excessive force allegations brought against the LAPD. Included in the series are memoranda, witness testimonies, interview summaries, copies of officers' background files, after-action summaries and reports, and notes taken by the firm. Materials relate to four major areas of study undertaken by the firm: the Justice for Janitors labor demonstration of 1990, the jail ward of County/USC Medical Center, Los Angeles city jails, and a review of the LAPD's Background Investigation Unit.
DOI: 10.48577/jpl.dzpnhw
title: Validation and quality assessment of the ECOSTRESS level-2 land surface temperature and emissivity product

description: The ECOsystem Spaceborne Thermal Radiometer Experiment on Space Station (ECOSTRESS) was launched to the International Space Station (ISS) on June 29, 2018, and currently provides the highest spatial resolution thermal infrared (TIR) data (38m × 69m) available from space. In this study, we validated the ECOSTRESS level-2 Land Surface Temperature and Emissivity (LST&E) product at fourteen sites located in North America, Europe, and Africa to the Committee on Earth Observation Satellites (CEOS) Land Product Validation (LPV) Stage-1 status. Two primary methods are recommended for the validation of LST data: a Temperature-based (T-based) and a Radiance-based (R-based) method. The T-based method requires calibrated measurements of the ground leaving radiance concurrent with the satellite overpass. In contrast, the R-based method uses a radiative closure simulation with external atmospheric profiles and an a priori knowledge of surface emissivity. Using these methods, we validated 1,139 ECOSTRESS clear-sky observations between August 1, 2018, and March 31, 2020. In general, there was good agreement with ground-based measurements with an average root mean square error (RMSE) of 1.07 K in LST and r² values ranging from 0.988-0.997 for all sites. A cold bias of ~0.75 K was identified for temperatures below 295 K linked to calibration issues that will be addressed in future reprocessing of the data. Retrieved emissivity comparisons with laboratory spectra had an RMSE of 0.023 (2.3%) for all bands on average. With the decommissioning of ASTER on Terra in 2023, the multispectral and high spatial resolution characteristics of ECOSTRESS data serves as a bridge to NASA’s Surface Biology and Geology (SBG) designated observable. SBG will launch as early as 2026 and will join other international TIR missions such as the Thermal infraRed Imaging Satellite for High-resolution Natural resource Assessment (TRISHNA) and the Land Surface Temperature Monitoring (LSTM) mission, which have launch dates of 2025 and 2028, respectively.
DOI: 10.15468/dl.wxqhq4
title: Occurrence Download

description: A dataset containing 0 species occurrences available in GBIF matching the query:
{
 "TaxonKey" : [
 "is Dendrobium pseudopeloricum J.J.Sm."
 ]
}

 The dataset includes 0 records from 0 constituent datasets; see https://api.gbif.org/v1/occurrence/download/0170050-230224095556074/datasets/export for details.
DOI: 10.48577/jpl.wbobr6
title: A Low-Loss Silicon MEMS Phase Shifter Operating in the 550 GHz Band

description: This paper presents a low-loss silicon microelectrical mechanical system (MEMS) phase shifter operating in the 500 - 600 GHz band. The phase shifter consists of a30 um thick perforated silicon slab that is moved in and out of a waveguide in the E-plane with a large deflection MEMS actuator. By implementing different hexagonal patterns in the silicon slab, a stepped permittivity is created to impedance matchand thus reduce return loss. When the silicon slab is inserted into the waveguide, the phase velocity of the incoming wave is decreased, thus resulting in different phase shifts depending on the position of the slab inside the waveguide. The MEMS phaseshifter is fully actuated at around 50 V and can move up to +/-95 um, depending on the applied voltage. The insertion loss, when the maximum phase shift is achieved, is measured to be 1.8 dB, compared to a 1.6 dB insertion loss for a waveguideof equivalent length. The return loss is better than 18 dB for the desired band. The measured phase shift, with the slab fully inserted into the waveguide at 550 GHz was 145 deg. The MEMS phase shifter enables a variety of applications including phasedarray antenna systems with scanning capability for mapping of planetary surfaces with an electronically steerable antenna.
DOI: 10.15468/dl.lx1ow5
title: Occurrence Download

description: A dataset containing 140 species occurrences available in GBIF matching the query:
{
 "TaxonKey" : [
 "is Eucodonia verticillata (M.Martens & Galeotti) Wiehler"
 ]
}

 The dataset includes 140 records from 30 constituent datasets; see https://api.gbif.org/v1/occurrence/download/0001444-170822121629195/datasets/export for details.
 
Data from some individual datasets included in this download may be licensed under less restrictive terms.
DOI: 10.25549/independent-c69-44806
title: Attorney notes, 1991 Apr.-June

description: Collection of handwritten attorney notes, some with attached business cards (Sol Bernstein, Thomas W. Lorenzen, Charles M. Naumer, Philip A. Henning Jr.), with Los Angeles Police Department complaint database reports, phone message, 1991 April-June. PART OF A SERIES: The series relates to the work product of Sibley & Austin, whose staff contributed to the Commission's probe of excessive force allegations brought against the LAPD. Included in the series are memoranda, witness testimonies, interview summaries, copies of officers' background files, after-action summaries and reports, and notes taken by the firm. Materials relate to four major areas of study undertaken by the firm: the Justice for Janitors labor demonstration of 1990, the jail ward of County/USC Medical Center, Los Angeles city jails, and a review of the LAPD's Background Investigation Unit.
DOI: 10.48577/jpl.xhebpw
title: Demonstration of a Thermally-Coupled Row-Column SNSPD Imaging Array

description: No abstract available.
DOI: 10.48577/jpl.duqrd0
title: A Broadband Digital Spectrometer for the Deep Space Network

description: The Deep Space Network (DSN) enables NASA to communicate with its spacecraft in deep space.By virtue of its large antennas, the DSN can also be used as a powerful instrument for radio astronomy.Specically, Deep Space Station (DSS) 43, the 70 m antenna at the Canberra Deep Space Communi-cations Complex (CDSCC) has a K-band radio astronomy system covering a 10 GHz bandwidth at17 GHz to 27 GHz. This spectral range covers a number of atomic and molecular lines, produced ina rich variety of interstellar gas conditions. Lines include hydrogen radio recombination lines (RRLs),cyclopropenylidene (C3H2), water masers (H2O), and ammonia (NH3). A new high-resolution spec-trometer was deployed at CDSCC in November 2019 and connected to the K-band downconverter.The spectrometer has a total bandwidth of 16 GHz. Such a large total bandwidth enables, for ex-ample, the simultaneous observations of a large number of RRLs, which can be combined together tosignicantly improve the sensitivity of these observations. The system has two rmware modes: 1)A 65k-pt FFT to provide 32768 spectral channels at 30.5 kHz and 2) A 16k-pt polyphase lterbank(PFB) to provide 8192 spectral channels with 122 kHz resolution. The observation process is designedto maximize autonomy, from the Principle Investigator's inputs to the output data in FITS le format.We present preliminary mapping observations of hydrogen RRLs in Orion KL mapping taken usingthe new spectrometer.
DOI: 10.15468/dl.p3jnhz
title: Occurrence Download

description: A dataset containing 234829 species occurrences available in GBIF matching the query:
{
 "and" : [
 "Geometry POLYGON ((35.924964333333335 32.097476, 35.924964333333335 49.184106666666665, 1.8796086666666671 49.184106666666665, 1.8796086666666671 32.097476, 35.924964333333335 32.097476))",
 "EventDate is 2010-10-01,2010-10-31"
 ]
}

 The dataset includes 234829 records from 570 constituent datasets; see https://api.gbif.org/v1/occurrence/download/0052541-231002084531237/datasets/export for details.
 
Data from some individual datasets included in this download may be licensed under less restrictive terms.
DOI: 10.48577/jpl.2ksawg
title: InSAR-based characterization of rock glacier movement in the Uinta Mountains, Utah, USA

description: Rock glaciers are a prominent component of many alpine landscapes and constitute a significant water resource in some arid mountain environments. Here, we employ satellite-based interferometric synthetic aperture radar (InSAR) between 2016 and 2019 to identify and monitor active and transitional rock glaciers in the Uinta Mountains (Utah, USA), an area of ~3,000 km2. We used mean velocity maps to generate an inventory for the Uinta Mountains containing 205 active and transitional rock glaciers. These rock glaciers are 11.9 ha in area on average and located at a mean elevation of 3308 m, where mean annual air temperature is -0.25 ˚C. The mean downslope velocity for the inventory is 1.94 cm/yr, but individual rock glaciers have LOS velocities ranging from 0.35 to 6.04 cm/yr. To search for relationships with climatic drivers, we investigated the time-dependent motion of three rock glaciers. We found that rock glacier motion has a significant seasonal component, with rates that are more than 5 times faster during the late summer compared to the rest of the year. Rock glacier velocities also appear to be correlated with the snow-water equivalent of the previous winter’s snowpack. Our results demonstrate the ability to use satellite InSAR to monitor rock glaciers over large areas and provide insight into the environmental factors that control their kinematics.
DOI: 10.15468/dl.rq3phk
title: Occurrence Download

description: A dataset containing 4347 species occurrences available in GBIF matching the query:
{
 "TaxonKey" : [
 "is Emys orbicularis (Linnaeus, 1758)"
 ]
}

 The dataset includes 4347 records from 91 constituent datasets; see https://api.gbif.org/v1/occurrence/download/0001444-171109162308116/datasets/export for details.
 
Data from some individual datasets included in this download may be licensed under less restrictive terms.