cometadata/datacite-titles-descriptions-related-identifiers huggingface dataset:
DOI: 10.48577/jpl.g01bhn
title: The HI/OH/Recombination line survey of the inner Milky Way (THOR): data release 2 and Hi overview

description: Molecular clouds form from the atomic phase of the interstellar medium. However, characterizing the transition between the atomic and the molecular interstellar medium (ISM) is a dicult observational task. Here we address cloud formation processes by combining Hi self absorption (HISA) with molecular line data. Column density probability density functions (N-PDFs) are a common tool to examine molecular clouds. One scenario proposed by numerical simulations is that the N-PDF evolves from a log-normal shape at early times to a power-law-like shape at later times. To date, investigations of N-PDFs are mostly limited to the molecular component of the cloud. In this paper, we study the cold atomic component of the giant molecular filament GMF38.1-32.4a (GMF38a, distance=3.4 kpc, length 230 pc), calculate its N-PDFs and study its kinematics. We identify an extended HISA feature, which is partly correlated with the 13CO emission. The peak velocities of the HISA and 13CO observations agree well on the eastern side of the filament, whereas a velocity oset of approximately 4 km s􀀀1 is found on the western side. The sonic Mach number we derive from the linewidth measurements shows that a large fraction of the HISA, which is ascribed to the cold neutral medium (CNM), is at subsonic and transonic velocities. The column density of the CNM part is on the order of 1020 to 1021 cm􀀀2. The column density of molecular hydrogen, traced by 13CO, is an order of magnitude higher. The N-PDFs from HISA (CNM), Hi emission (the warm and cold neutral medium), and 13CO (molecular component) are well described by log-normal functions, which is in agreement with turbulent motions being the main driver of cloud dynamics. The N-PDF of the molecular component also shows a power law in the high column-density region, indicating self-gravity. We suggest that we are witnessing two dierent evolutionary stages within the filament. The eastern subregion seems to be forming a molecular cloud out of the atomic gas, whereas the western subregion already shows high column density peaks, active star formation and evidence of related feedback processes.
DOI: 10.15468/dl.s01dth
title: Occurrence Download

description: A dataset containing 2742331 species occurrences available in GBIF matching the query:
{
 "and" : [
 {
 "or" : [
 "Country is Israel",
 "Country is Isle of Man",
 "Country is India",
 "Country is Indonesia",
 "Country is Iraq",
 "Country is Iran (Islamic Republic of)",
 "Country is Iceland",
 "Country is Italy",
 "Country is Ireland"
 ]
 },
 "BasisOfRecord is Specimen"
 ]
}

 The dataset includes 2742331 records from 910 constituent datasets; see https://api.gbif.org/v1/occurrence/download/0001445-150410134957023/datasets/export for details.
 
Data from some individual datasets included in this download may be licensed under less restrictive terms.
DOI: 10.25549/independent-c69-46487
title: Advisory, "Good Cops - Bad Cops" - 1991 Winter

description: Advisory, vol. 9, no. 1 (1991 Winter). Includes Michael Rushford "Good cops -- bad cops".
DOI: 10.48577/jpl.etb9ow
title: Demonstration of deployment repeatability of key subsystems of a furled starshade architecture

description: Starshade concepts must be stowed within rocket fairings for launch and then deployed in space; the in-plane deployment accuracy must be on the order of hundreds of micrometers for sufficient starlight suppression to enable the detection and study of Earth-like exoplanets around nearby Sun-like stars. This paper describes tests conducted to demonstrate deployment accuracy of two key structural subsystems of the “furled” starshade architecture – the petal and the inner disk. Together, the petals and the inner disk create the in-plane shape of a starshade. Medium- fidelity petal and inner disk test articles were constructed at relevant scales for a 26 m-diameter starshade. These test articles were subjected to stowage-and-deployment cycles and their shapes were measured. The measured performance – tens of parts per million of petal strain after deployment, and hundreds of micrometers of inner disk deployment accuracy – was found to be within required allocations.
DOI: 10.48577/jpl.qztoe3
title: Designing Low-Thrust Transfers to High-Inclination Science Orbits via Hybrid Optimization

description: Placing a small satellite into a high-inclination orbit with respect to the ecliptic plane may offer a low-cost option for opportunistic and targeted observations of the polar regions of the Sun or the zodiacal dust cloud of our solar system. In this paper, dynamical systems theory and hybrid optimization techniques are integrated into a cohesive framework to design low-thrust trajectories for a small satellite to reach a highly out-of-ecliptic science orbit near the Sun-Earth L2 equilibrium point. Propellant-optimal, low-thrust trajectories with a specific geometry are designed and studied across a variety of engine and power models within a low-thrust-enabled circular restricted three-body problem. The geometry of the trajectories is then varied during the initial guess construction process to support a preliminary study of the trade-off between flight time and propellant mass usage.
DOI: 10.15468/dl.87yd22
title: Occurrence Download

description: A dataset containing 39 species occurrences available in GBIF matching the query:
{
 "TaxonKey" : [
 "is Dendrobium trichostomum Rchb.f. ex Oliv."
 ]
}

 The dataset includes 39 records from 11 constituent datasets; see https://api.gbif.org/v1/occurrence/download/0170074-230224095556074/datasets/export for details.
 
Data from some individual datasets included in this download may be licensed under less restrictive terms.
DOI: 10.25549/independent-c69-46271
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.deaxyv
title: Experimental Demonstration of Time-Delay Interferometry with Optical Frequency Comb

description: Heterodyne laser phase measurements in the Laser Interferometer Space Antenna (LISA) aredegraded by the phase uctuations of the onboard clocks, resulting in unacceptable sensitivity performancelevels of the interferometric data. The current scheme for cancellation of the clock phasenoise requires 1 GHz modulation of the ranging laser beams and additional inter-spacecraft clockrecovery heterodyne phase measurements. Here we report experimental results for an alternativeapproach to clock noise cancellation based on modied second generation time-delay interferometry(TDI) with optical frequency combs (OFCs). The use of OFCs in the LISA scheme allowssimultaneous cancellation of both laser and clock noises, and would eliminate the need for 1 GHzlaser modulations and associated demodulation detections. Two Mach-Zehnder interferometers withacousto-optic modulators were used to simulate two LISA arms with Doppler shifts and time delays.With a self-referenced OFC locked to the laser providing the clock signal, we achieve simultaneoussuppression of laser and clock noises by 7 and 1.5 orders of magnitudes respectively down to the setupnoise oor. Based on a numerical analysis, we further show that the noise suppression performanceof the OFC-based TDI scheme can meet the LISA mission requirements with ample margin.
DOI: 10.15468/dl.jqnxtt
title: Occurrence Download

description: A dataset containing 1252 species occurrences available in GBIF matching the query:
{
 "and" : [
 "TaxonKey is Epidendrum L.",
 "Geometry POLYGON((-72.421875 11.178401,-80.15625 7.710991,-78.75 1.406108,-70.3125 -1.406108,-68.90625 2.811371,-68.203125 9.795677,-72.421875 11.178401))"
 ]
}

 The dataset includes 1252 records from 35 constituent datasets; see https://api.gbif.org/v1/occurrence/download/0001445-150422101436696/datasets/export for details.
 
Data from some individual datasets included in this download may be licensed under less restrictive terms.
DOI: 10.48577/jpl.xhwob8
title: Mars Landing and Related Technical Challenges

description: No abstract available.
DOI: 10.48577/jpl.qxqxcr
title: Overall Thermal Architecture Design of the Mars Sample Return Lander Mission

description: NASA and the European Space Agency are currently planning a Mars Sample Return campaign that would bring Martian regolith and rock samples collected and cached in tubes by the Perseverance rover (Mars 2020) back to Earth for scientific investigation. The Mars 2020 rover landed on Mars, in Jezero Crater, on February 18, 2021. The Mars Sample Retrieval Lander (SRL) would land the Mars Ascent Vehicle (MAV) on the surface of Mars. A Sample Fetch Rover (SFR), in a separate mission, would collect the sample tubes deposited by the Perseverance Rover and insert them in the MAV, followed by the MAV launching them into Mars orbit within an Orbiting Sample (OS) container. The Earth Return Orbiter would rendezvous with the OS, and capture and seal it inside a primary and secondary containment vessel, followed by the OS landing on Earth in the Earth Entry System. The SRL is being designed to maintain the thermal integrity of all thermally controlled components residing in it, including the MAV, lander avionics, the propulsion system, etc. during all flight phases starting from launch until landing and the completion of its mission on the surface of Mars. During cruise, the primary thermal control is achieved by a mechanically pumped fluid loop heat rejection system. On the surface of Mars its environment varies significantly (in excess of a 100°C swing) during a diurnal cycle. There is significant shortage of solar thermal power to maintain the proper temperature range of the SRL, hence its thermal design is very challenging. This paper discusses the thermal design of the SRL during all flight phases by the innovative use of thermal control methods. This minimizes volumetric, mass and power resources to maintain its components and systems within their allowable temperature limits, while surviving the severe environment of cruise on Mars.
DOI: 10.25549/independent-c69-45881
title: Reviews / summaries of complaints & personnel files (1989-1990), 1991-06-21

description: Memo - re: internal affairs division review of personnel complaints - from: Thomas K Braun; to: Mr. Drooyan; IAD investigative file - research forms (1989-1990), 1991 June 21. PART OF A SERIES: To better understand how LAPD management reacts to problem officers, Skadden, Arps, Slate, Meagher & Flom examined the Department's procedures regarding the identification, documentation, and response to personnel complaints. The series includes memoranda and correspondence; attorney notes; materials related to the firm's administrative capacities, including staff rosters and work plans; flow charts that illustrate the LAPD's structure and organization; and draft copies of the firm's contributions to the Commission report.
DOI: 10.48577/jpl.j9zx8p
title: Visual Loop Closure Detection for a Future Mars Science Helicopter

description: Future Mars Rotorcrafts will require the ability to precisely navigate to previously visited locations in order to return to a safe landing site or execute precise scientific measurements such as sample acquisition or targeted sensing. To enable a future Mars Science Helicopter to perform in- flight loop closures, we present an on-board visual loop closure detection system based on a Bag-of-Words (BoW) approach that is efficient enough to run in real-time on the anticipated com- putationally constrained flight avionics. Our system establishes image-to-image associations between incoming images of a downward-looking navigation camera and previously observed geo-tagged keyframes stored in a database. The system extracts ORB features which are quantized into a BoW histogram using a custom 1 million words hierarchical vocabulary, trained on synthetic images from a Mars simulation. An efficient database query using an inverted index produces a set of candidate frames which we check for geometrical consistency. For efficient feature matching, we leverage the vocabulary to perform fast approximate nearest neighbor search. The geometrical check accepts loop closure pairs whose essential matrix is supported by a minimum number of feature matches, which are pre-selected based on a rotational consistency check. The vocabulary and the methods used for the geometrical con- sistency checks were chosen to maximize the performance while allowing single-thread real-time execution on a computationally constrained embedded processor. We demonstrate and evaluate the proposed system both on simulated and real-world data, including flight data from the Mars Helicopter Ingenuity.
DOI: 10.15468/dl.8yzaex
title: Occurrence Download

description: A dataset containing 25 species occurrences available in GBIF matching the query:
{
 "TaxonKey" : [
 "is Dendrobium punamense Schltr."
 ]
}

 The dataset includes 25 records from 5 constituent datasets; see https://api.gbif.org/v1/occurrence/download/0170062-230224095556074/datasets/export for details.
 
Data from some individual datasets included in this download may be licensed under less restrictive terms.
DOI: 10.48577/jpl.9emoms
title: Loop Closure Prioritization for Efficient and Scalable Multi-Robot SLAM

description: Multi-robot SLAM systems in GPS-denied environments require loop closures to maintain a drift-free centralized map. With increasing number of robots and size of the environment, checking and computing the transformation for all the loop closure candidates becomes computationally infeasible. In this work, we describe a loop closure module that is able to prioritize which loop closures to compute based on the underlying pose graph, the proximity to known beacons, and the characteristics of the point clouds. We validate this system in the context of the DARPA Subterranean Challenge and on numerous challenging underground datasets and demonstrate the ability of this system to generate and maintain a map with low error. We find that our proposed techniques are able to select effective loop closures which results in 51% mean reduction in median error when compared to an odometric solution and 75% mean reduction in median error when compared to a baseline version of this system with no prioritization.
DOI: 10.15468/dl.kuadfz
title: Occurrence Download

description: A dataset containing 310617 species occurrences available in GBIF matching the query:
{
 "and" : [
 "TaxonKey is Cerastium fontanum Baumg.",
 "HasGeospatialIssue is false",
 "HasCoordinate is true"
 ]
}

 The dataset includes 310617 records from 458 constituent datasets; see https://api.gbif.org/v1/occurrence/download/0001445-150504100648427/datasets/export for details.
 
Data from some individual datasets included in this download may be licensed under less restrictive terms.
DOI: 10.25549/independent-c69-46045
title: Reports - Police Foundation Annual Report - 1989 - G 31161-00001

description: Reports - James Q. Wilson, Hubert Williams, et al. Police Foundation annual report. Washington, DC: Police Foundation, 1989.
DOI: 10.48577/jpl.kn67d0
title: Final Thermal Design of the Mars 2020 Sample Tube

description: The Mars 2020 Perseverance Rover landed on Mars, in Jezero Crater, on February 18, 2021. One of the primary mission objectives for the Perseverance Rover is to collect and cache a set of Martian rock and regolith samples for potential future return to Earth. Samples will be collected and placed into sample tubes using a Coring Drill (Corer) located at the end of a large Robotic Arm. Filled sample tubes will be transferred from the outside of the Rover into the Adaptive Caching Assembly (ACA), located inside the Rover chassis, via the Bit Carousel. Once a filled sample tube is brought into the ACA, the Sample Handling Assembly (SHA) will transfer it to all of the internal processing stations of the ACA for volume assessment, sealing and finally drop-off on the Martian surface. The sample tubes could remain on the Mars surface for as long as 10 years. In order to preserve the sample’s scientific integrity, the sample tube temperature may not exceed 60°C. This paper documents the bounding flight temperature predictions for the final Mars 2020 Sample Tube design, lying on the Mars surface, in the Jezero Crater landing site. This paper discusses the thermal design of the sample tube that uses passive thermal control coatings to keep the sample below its maximum allowable temperature limit of 60°C, during exposure to the Mars surface environment.
DOI: 10.48577/jpl.znokcd
title: Spherical harmonics representation of the gravitational phase shift

description: We investigate the evolution of the general relativistic phase of an electromagnetic (EM) wave as it propagates in a weak gravitational field. Treating the source as an isolated, weakly aspherical gravitating body, we represent its external gravitational field using Cartesian symmetric trace-free (STF) mass multipole moments. The light propagation equation is solvable along the trajectory of a light ray to all STF orders ℓ. We express the STF moments via spherical harmonic coefficients of various degree and order, Cℓk, Sℓk. Although we focus primarily on the quadrupole (ℓ = 2), octupole (ℓ = 3), and hexadecapole (ℓ = 4) cases, our approach is valid to all orders. The result is the gravitational phase shift expressed in terms of the spherical harmonics. These results are new, useful, and important as increasingly accurate clocks are used for many practical and scientific applications, including space-based time and frequency transfers, relativistic geodesy, and navigation. We also consider tidal contributions and contributions due to the Earth’s rotation. We estimate the characteristic numerical magnitudes of each term of the resulting overall gravitational phase shift.
DOI: 10.48577/jpl.z73row
title: Two-Phase Thermal Control Hardware Verification and Validation for the Ka-band Radar Interferometer Instrument

description: The thermal architecture of the Ka-band Radar Interferometer instrument (KaRIn), part of the Surface Water Ocean Topography (SWOT) mission, utilizes loop heat pipes (LHPs) and constant conductance heat pipes (CCHPs) to transport waste heat (1 kW) from the instrument electronics to the radiator. The main thermal design risk is the ability to maintain a temporal stability of &lt;0.05°C/min in a low earth orbit environment. The stringent thermal requirements are part of the overall error budget needed to meet the primary mission science goals. This is a culmination of the final verification and validation of the flight hardware delivery and covers a summary of the design and testbed activities previously reported, the evolution of, and the ultimate verification and validation of the thermal design.
DOI: 10.15468/dl.j6cq75
title: Occurrence Download

description: A dataset containing 2 species occurrences available in GBIF matching the query:
{
 "TaxonKey" : [
 "is Dendrobium quinquelobatum Schltr."
 ]
}

 The dataset includes 2 records from 2 constituent datasets; see https://api.gbif.org/v1/occurrence/download/0170079-230224095556074/datasets/export for details.
 
Data from some individual datasets included in this download may be licensed under less restrictive terms.
DOI: 10.25549/independent-c69-46042
title: Reports - Police Foundation Annual Report - 1989 - G 31161-00001

description: Reports - James Q. Wilson, Hubert Williams, et al. Police Foundation annual report. Washington, DC: Police Foundation, 1989.
DOI: 10.48577/jpl.pzehpo
title: Measurement Report: Spatiotemporal variability of peroxy acyl nitrates (PANs) over Mexico City from TES and CrIS satellite measurements

description: Peroxy acyl nitrates (PANs) are photochemical pollutants with implications for health and atmospheric oxidation capacity. PANs are formed via the oxidation of non-methane volatile organic compounds (NMVOCs) in the presence of nitrogen oxide radicals (NOx = NO + NO2). While urban environments are large sources of PANs, in-situ observations in urban areas are limited. Here we use satellite measurements of PANs from the Tropospheric Emission Spectrometer (TES) and the Suomi National Polar-orbiting Partnership (S-NPP) Cross-Track Infrared Sounder (CrIS) to evaluate the spatiotemporal variability of PANs over and around Mexico City. Monthly mean maxima in PANs over the Mexico City Metropolitan Area (MCMA) occur during spring months (March-May). This time of year coincides with a peak in local photochemistry and more frequent air stagnation. Local fire activity also typically peaks between February and May, which leads to strong interannual variability of PANs over the MCMA. We use S-NPP CrIS data to probe the spatial outflow pattern of PANs produced within urban Mexico City during the month with the largest mixing ratios of PANs (April). Peak outflow in April occurs to the northeast of the city and over the mountains south of the city. Outflow to the northwest appears infrequent. Using observations during 2018 versus 2019, we also show that PANs were not significantly reduced during a year with a significant decrease in NOx over Mexico City. Our analysis demonstrates that the space-based observations provided by CrIS and TES can increase understanding of the spatiotemporal variability of PANs over and surrounding Mexico City.
DOI: 10.15468/dl.pianyu
title: Occurrence Download

description: A dataset containing 548534 species occurrences available in GBIF matching the query:
{
 "and" : [
 "TaxonKey is Amphibia",
 "HasGeospatialIssue is false",
 "HasCoordinate is true",
 "Year 1990-2015"
 ]
}

 The dataset includes 548534 records from 673 constituent datasets; see https://api.gbif.org/v1/occurrence/download/0001445-150528172251762/datasets/export for details.
 
Data from some individual datasets included in this download may be licensed under less restrictive terms.
DOI: 10.48577/jpl.bmqhlr
title: Turbulent drag at the ice-ocean interface of Europa in simulations of rotating convection: Implications for nonsynchronous rotation of the ice shell

description: Europa’s geologically scarred surface shows significant evidence that the ice shell may have rotated nonsynchronously in the past. The long-term spin-state of the ice shell is controlled by the time-mean torques acting on upon it. A torque that has not been previously considered is that exerted due to drag from oceanic currents beneath the ice. We estimate this torque for the first time by performing global, non-hydrostatic, three-dimensional simulations of Europa’s ocean, including nonlinear turbulent boundary layer drag at the seafloor and ice-ocean interface. Our simulations show that ocean dynamics which manifest in alternating east-west jets result in a net torque on the ice shell. The torque can act to either spin-up or spin-down the ice shell depending on the strength of convection, suggesting that a torque reversal can occur as Europa’s interior thermally evolves. Scaling analysis indicates that an average jet speed of at least ∼1 cm/s is required for the ice-ocean torque to be comparable to the tidal torque acting to spin-up the ice shell. Our results suggests that ocean currents may contribute to any nonsynchronous rotation of the ice shell. Consequently, Europa’s present day spin-state may hold information about the dynamics of its subsurface ocean.