cometadata/datacite-titles-descriptions-related-identifiers huggingface dataset:
DOI: 10.7274/27949080.v1
title: Active Control of Laminar and Turbulent Flows Using Adjoint-Based Machine Learning

description: Active control of fluid dynamics in engineering applications is valuable but challenging, as traditional optimization methods struggle with the complex, high-dimensional nature of these problems.
This dissertation extends and applies an adjoint-based machine learning method, the deep learning PDE augmentation method (DPM), for closed-loop active control on both laminar and turbulent flows. The end-to-end sensitivities for optimization are computed using adjoints of the governing equations without restriction on the terms that may appear in the objective function, which we construct using algorithmic differentiation applied to the flow solver. 

In one-dimensional Burgers' equation examples with analytic (manufactured) solutions, the DPM framework is validated, demonstrating comparable effectiveness to standard supervised learning for in-sample solutions, and superior performance for out-of-sample cases (i.e., with different analytic control functions). Additionally, the influence of optimization time intervals and neural network complexity is analyzed, providing insights that guide algorithm design and hyperparameter selection to balance control efficacy and computational cost.

The DPM algorithm is then applied to three laminar flow scenarios. First, drag reduction performance and optimization costs are compared between adjoint-based controllers and deep reinforcement learning (DRL)--based controllers for two-dimensional, incompressible, confined flow over a cylinder, with control achieved via synthetic body forces along the cylinder boundary. The DPM-based controller outperforms the DRL-based controller in both computational efficiency and effectiveness. Second, DPM-based control is tested for compressible, unconfined flow over a cylinder, with the controller extrapolated to out-of-sample Reynolds numbers. A simplified, steady, offline controller is also derived from the DPM control law, achieving comparable drag reduction and vortex shedding stabilization to its adaptive counterparts. Third, a more realistic blowing/suction jet controller is developed for drag reductions with sparse sensors and actuators on the cylinder surface. Both the adaptive trained and simplified constant adjoint-based models are effective for in- and out-of-sample Reynolds numbers.

Beyond laminar flows, the DPM algorithm is extrapolated to turbulent airfoil flows to enhance the lift-to-drag ratio while maintaining manageable energy expenditure. Direct numerical simulations and large eddy simulations are conducted for two-dimensional semi-infinite and three-dimensional airfoils at three angles of attack. Control actions, implemented through blowing/suction jets on the upper surface, are informed by local pressure measurements, which serve as inputs to the controller. Both 2D-trained and 3D-trained DPM controllers effectively capture flow dynamics, significantly improving aerodynamic performance.
DOI: 10.15468/dl.xamhsg
title: Occurrence Download

description: A dataset containing 177 species occurrences available in GBIF matching the query:
{
 "and" : [
 "Country is China",
 "OccurrenceStatus is Present",
 "TaxonKey is Rhynchophorus ferrugineus (A.G.Olivier, 1791)"
 ]
}

 The dataset includes 177 records from 3 constituent datasets; see https://api.gbif.org/v1/occurrence/download/0043048-241126133413365/datasets/export for details.
 
Data from some individual datasets included in this download may be licensed under less restrictive terms.
DOI: 10.15468/dl.bmj9ac
title: Occurrence Download

description: A dataset containing 10079568 species occurrences available in GBIF matching the query:
{
 "DatasetKey" : [
 "is Victorian Biodiversity Atlas"
 ]
}

 The dataset includes 10079568 records from 1 constituent datasets; see https://api.gbif.org/v1/occurrence/download/0043037-241126133413365/datasets/export for details.
 
Data from some individual datasets included in this download may be licensed under less restrictive terms.
DOI: 10.1594/pangaea.965279
title: Basic and other measurements of radiation at station Syowa (2023-05)
DOI: 10.1594/pangaea.965280
title: Basic and other measurements of radiation at station Syowa (2023-09)
DOI: 10.1594/pangaea.965282
title: Basic and other measurements of radiation at station Syowa (2023-04)
DOI: 10.1594/pangaea.965281
title: Basic and other measurements of radiation at station Syowa (2023-03)
DOI: 10.1594/pangaea.965284
title: Basic and other measurements of radiation at station Syowa (2023-02)
DOI: 10.1594/pangaea.965309
title: Basic and other measurements of radiation at station Syowa (2023-01)
DOI: 10.1594/pangaea.965304
title: Basic and other measurements of radiation at station Syowa (2022-04), Version 2

description: Version 2, 2024-02-01, diffuse solar radiation for some period was deleted, as there was a problem with the installation of pyranometer.
DOI: 10.1594/pangaea.965295
title: Basic and other measurements of radiation at station Syowa (2021-06)

description: Version 2, 2024-02-01, with some diffuse solar radiation data deleted (malfunction in the shielding device attached to the sun tracker).
DOI: 10.1594/pangaea.965286
title: Basic and other measurements of radiation at station Syowa (2021-02)

description: Version 2, 2024-02-01, with some diffuse solar radiation data deleted (malfunction in the shielding device attached to the sun tracker).
DOI: 10.1594/pangaea.965310
title: Basic and other measurements of radiation at station Syowa (2022-11)

description: Diffuse solar radiation for some period was deleted, as there was a problem with the installation of pyranometer.
DOI: 10.1594/pangaea.740947
title: Basic and other measurements of radiation at station Syowa (2007-09)
DOI: 10.1594/pangaea.942314
title: Basic and other measurements of radiation at station Syowa (2021-09), Version 1
DOI: 10.1594/pangaea.942310
title: Basic and other measurements of radiation at station Syowa (2021-11), Version 1

description: Data points were removed due a pointing problem after a device failure.
DOI: 10.1594/pangaea.927810
title: Basic and other measurements of radiation at station Syowa (2020-06)
DOI: 10.1594/pangaea.927776
title: Basic and other measurements of radiation at station Syowa (2020-04)
DOI: 10.1594/pangaea.927807
title: Basic and other measurements of radiation at station Syowa (2020-05)
DOI: 10.1594/pangaea.927817
title: Basic and other measurements of radiation at station Syowa (2020-08)
DOI: 10.1594/pangaea.927823
title: Basic and other measurements of radiation at station Syowa (2020-10)
DOI: 10.1594/pangaea.927826
title: Basic and other measurements of radiation at station Syowa (2020-11)
DOI: 10.1594/pangaea.738181
title: Basic and other measurements of radiation at station Syowa (2006-11)
DOI: 10.1594/pangaea.942317
title: Basic and other measurements of radiation at station Syowa (2021-10), Version 1
DOI: 10.1594/pangaea.931946
title: Basic and other measurements of radiation at station Syowa (2021-03), Version 1
DOI: 10.1594/pangaea.965305
title: Basic and other measurements of radiation at station Syowa (2021-10)

description: Version 2, 2024-02-01, with some diffuse solar radiation data deleted (malfunction in the shielding device attached to the sun tracker).
DOI: 10.1594/pangaea.965307
title: Basic and other measurements of radiation at station Syowa (2021-12)
DOI: 10.1594/pangaea.965308
title: Basic and other measurements of radiation at station Syowa (2022-12)

description: Diffuse solar radiation for some period was deleted, as there was a problem with the installation of pyranometer.
DOI: 10.1594/pangaea.965311
title: Basic and other measurements of radiation at station Syowa (2022-10)

description: Diffuse solar radiation for some period was deleted, as there was a problem with the installation of pyranometer.
DOI: 10.1594/pangaea.965294
title: Basic and other measurements of radiation at station Syowa (2021-07)

description: Version 2, 2024-02-01, with some diffuse solar radiation data deleted (malfunction in the shielding device attached to the sun tracker).
DOI: 10.1594/pangaea.965297
title: Basic and other measurements of radiation at station Syowa (2022-02)
DOI: 10.1594/pangaea.965298
title: Basic and other measurements of radiation at station Syowa (2022-06)

description: Version 2, 2024-02-01, diffuse solar radiation for some period was deleted, as there was a problem with the installation of pyranometer.
DOI: 10.1594/pangaea.965296
title: Basic and other measurements of radiation at station Syowa (2022-01)

description: Diffuse solar radiation for some period was deleted, as there was a problem with the installation of pyranometer.
DOI: 10.1594/pangaea.965306
title: Basic and other measurements of radiation at station Syowa (2021-11)

description: Version 2, 2024-02-01, with some diffuse solar radiation data deleted (malfunction in the shielding device attached to the sun tracker).
DOI: 10.1594/pangaea.965302
title: Basic and other measurements of radiation at station Syowa (2022-05)

description: Version 2, 2024-02-01, diffuse solar radiation for some period was deleted, as there was a problem with the installation of pyranometer.
DOI: 10.1594/pangaea.965299
title: Basic and other measurements of radiation at station Syowa (2022-07)

description: Version 2, 2024-02-01, diffuse solar radiation for some period was deleted, as there was a problem with the installation of pyranometer.
DOI: 10.1594/pangaea.965312
title: Basic and other measurements of radiation at station Syowa (2023-06)
DOI: 10.1594/pangaea.965300
title: Basic and other measurements of radiation at station Syowa (2022-08)

description: Diffuse solar radiation for some period was deleted, as there was a problem with the installation of pyranometer.
DOI: 10.1594/pangaea.965313
title: Basic and other measurements of radiation at station Syowa (2023-07)
DOI: 10.1594/pangaea.965301
title: Basic and other measurements of radiation at station Syowa (2022-03)

description: Diffuse solar radiation for some period was deleted, as there was a problem with the installation of pyranometer.
DOI: 10.1594/pangaea.965314
title: Basic and other measurements of radiation at station Syowa (2023-08)
DOI: 10.1594/pangaea.965291
title: Basic and other measurements of radiation at station Syowa (2023-10)
DOI: 10.1594/pangaea.965292
title: Basic and other measurements of radiation at station Syowa (2021-08)

description: Version 2, 2024-02-01, with some diffuse solar radiation data deleted (malfunction in the shielding device attached to the sun tracker).
DOI: 10.1594/pangaea.672969
title: Basic and other measurements of radiation at station Syowa (2000-10)
DOI: 10.1594/pangaea.965293
title: Basic and other measurements of radiation at station Syowa (2021-09)

description: Version 2, 2024-02-01, with some diffuse solar radiation data deleted (malfunction in the shielding device attached to the sun tracker).
DOI: 10.1594/pangaea.738172
title: Basic and other measurements of radiation at station Syowa (2006-08)
DOI: 10.1594/pangaea.753604
title: Basic and other measurements of radiation at station Syowa (2009-08)
DOI: 10.1594/pangaea.967514
title: Grain-distribution of surface sediments in the Argentine basin, R/V METEOR cruises M23-2, M29-2, M46-3 and M49-2

description: The aim of this study is to better understand the oceanographic processes at the origin of contourite features. The samples were collected during four cruises onboard the R/V METEOR: M23-2 in 1993, M29-2 in 1994, M46-3 in 2000 and M49-2 in 2001. The measurements were performed to complement previous analyses and therefore, not all cores from these cruises have been measured. Grain size analyses were performed on bulk sediment samples with a Beckman Coulter Laser LS 13 320 at MARUM laboratories using Sodium hexametaphosphate as a dispersant.
DOI: 10.1594/pangaea.967596
title: Basic and other measurements of radiation at station Syowa (2024-01)
DOI: 10.1594/pangaea.740944
title: Basic and other measurements of radiation at station Syowa (2007-08)
DOI: 10.1594/pangaea.967597
title: Basic and other measurements of radiation at station Syowa (2024-02)
DOI: 10.1594/pangaea.967587
title: Basic and other measurements of radiation at station Syowa (2022-05)

description: Version 3, 2024-05-03: Diffuse solar radiation for May 2, 2022 was also deleted.
DOI: 10.1594/pangaea.672956
title: Basic and other measurements of radiation at station Syowa (1999-09)
DOI: 10.1594/pangaea.967588
title: Basic and other measurements of radiation at station Syowa (2022-04)

description: Version 3, 2024-05-03: Diffuse solar radiation for April 2, 2022 was also deleted.
DOI: 10.1594/pangaea.835405
title: Basic and other measurements of radiation at station Syowa (2013-02)
DOI: 10.1594/pangaea.815382
title: Basic and other measurements of radiation at station Syowa (2011-10)

description: Version 2, 2013-06-10
DOI: 10.1594/pangaea.672924
title: Basic measurements of radiation at station Syowa (1997-01)
DOI: 10.1594/pangaea.672912
title: Basic measurements of radiation at station Syowa (1996-01)
DOI: 10.1594/pangaea.672925
title: Basic measurements of radiation at station Syowa (1997-02)
DOI: 10.1594/pangaea.672926
title: Basic measurements of radiation at station Syowa (1997-03)
DOI: 10.1594/pangaea.672898
title: Basic measurements of radiation at station Syowa (1994-11)
DOI: 10.1594/pangaea.672899
title: Basic measurements of radiation at station Syowa (1994-12)
DOI: 10.1594/pangaea.672917
title: Basic measurements of radiation at station Syowa (1996-06)
DOI: 10.1594/pangaea.672935
title: Basic measurements of radiation at station Syowa (1997-12)
DOI: 10.1594/pangaea.738169
title: Basic and other measurements of radiation at station Syowa (2006-07)
DOI: 10.1594/pangaea.859495
title: Basic and other measurements of radiation at station Syowa (2014-11)
DOI: 10.1594/pangaea.937797
title: Basic and other measurements of radiation at station Syowa (2021-07), Version 1
DOI: 10.1594/pangaea.935554
title: Snowpit SnowMicroPen (SMP) force profiles collected during the MOSAiC expedition

description: The SnowMicroPen (SMP) is a portable device for high-resolution in-situ measurements of penetration resistance in snow and can be correlated to snow microstructure (density, specific surface area, snow type). The penetration force is measured using a piezo-electric sensor and is digitally recorded every 4 micrometers. The SMP signal can infer stratigraphy, snow type, and snow microstructure at a vertical resolution of 1-4 mm. Based on the force signal, density and specific surface area parameterizations are calculated. Through horizontally repeated measurements, the SMP can help relate detailed point-scale snow profiles to a larger sampling area and provide information about the spatial variability of snow stratigraphy and physical snow properties. During the MOSAiC expedition (October 2019-September 2020), the SMP was used to measure 389 snowpits or transects to allow for upscaling of detailed point measurements of snow profiles. This dataset consists of 6837 SMP measurements and covers a complete annual cycle of snow stratigraphy on sea ice in the high Arctic. Please direct inquiries to; David Wagner (PS122/1), Martin Schneebeli (PS122/2), Amy Macfarlane (PS122/3 and PS122/4), Ruzica Dadic (PS122/5).
DOI: 10.1594/pangaea.672932
title: Basic measurements of radiation at station Syowa (1997-09)
DOI: 10.1594/pangaea.672948
title: Basic and other measurements of radiation at station Syowa (1999-01)
DOI: 10.1594/pangaea.927813
title: Basic and other measurements of radiation at station Syowa (2020-07)
DOI: 10.1594/pangaea.672967
title: Basic and other measurements of radiation at station Syowa (2000-08)
DOI: 10.1594/pangaea.672981
title: Basic and other measurements of radiation at station Syowa (2001-10)
DOI: 10.1594/pangaea.823339
title: Basic and other measurements of radiation at station Syowa (2012-06)
DOI: 10.1594/pangaea.972731
title: Basic measurements of radiation at station Langley Research Center (2024-08)
DOI: 10.1594/pangaea.740938
title: Basic and other measurements of radiation at station Syowa (2007-06)
DOI: 10.1594/pangaea.938611
title: Basic and other measurements of radiation at station Syowa (2018-03)

description: Version 2, 2021-11-24, with some erroneous values removed/corrected.
DOI: 10.1594/pangaea.940757
title: Snow permittivity measured during the MOSAiC expedition

description: Dielectric permittivity (ε′) and dielectric loss (ε″) measurements were made of discrete snow layers and at fixed vertical intervals. Measurements were made using the Stevens Water Monitoring Systems Hydra Probe (a.k.a. hydraprobe). The hydraprobe uses a tine assembly consisting of a central waveguide and three outer rods, each 4.5 cm in length and 3 mm wide, to measure the impedance of the sample at 50 MHz over a cylindrical area of 5.7 cm in length by 3 cm in diameter. The sensor was calibrated using isopropyl alcohol for ε' (±0.6 %) and a saline solution of known conductivity for ε'' (±0.7 %). Samples were obtained by horizontally inserting the probe tines into the snow, at a given layer/interval (every 3cm), to their maximum depth and collecting a response. 0 cm is the snow-ice interface. For related temperature and density measurements see https://doi.pangaea.de/10.1594/PANGAEA.940200 and https://doi.pangaea.de/10.1594/PANGAEA.940214 in this bundled dataset.Please direct inquiries to; Aikaterini Tavri (PS122/4), Ruzica Dadic (PS122/5).
DOI: 10.1594/pangaea.955786
title: Seawater carbonate chemistry and benthic community composition at reefs of Bolinao, Philippines

description: Coral reefs are vulnerable to global ocean acidification (OA) and local human activities will continue to exacerbate coastal OA. In Bolinao, Philippines, intense unregulated fish mariculture has resulted in regional eutrophication. In order to examine the coastal acidification associated with this activity and the impact on nearby coral reefs, water quality and carbonate chemistry parameters were measured at three reef sites, a mariculture site and an offshore, minimally impacted control site during both the wet and dry season. Additionally, benthic community composition was characterized at reef sites, and both autonomous carbonate chemistry sampling and high-frequency pH measurements were used to characterize fine-scale (diel) temporal variability. Water quality was found to be poorer at all reefs during the wet season, when there was stronger outflow of waters from the mariculture area. Carbonate chemistry parameters differed significantly across the reef flat and between seasons, with more acidic conditions occurring during the dry season and increased primary production suppressing further acidification during the wet season. Significant relationships of both total alkalinity (TA) and dissolved inorganic carbon (DIC) with salinity across all stations may imply outflow of acidified water originating from the mariculture area where pH values as low as 7.78 were measured. This apparent mariculture-induced coastal acidification was likely due to organic matter respiration as sustained mariculture will continue to deliver organic matter. While TA-DIC vector diagrams indicate greater contribution of net primary production, net calcification potential in the nearest reef to mariculture area may already be diminished. The two farther reefs, characterized by higher coral cover, indicates healthier ecosystem functioning. Here we show that unregulated fish mariculture activities can lead to localized acidification and impact reef health. As these conditions at times approximate those projected to occur globally due to OA, our results may provide insight into reef persistence potential worldwide. These results also underscore the importance of coastal acidification and indicate that actions taken to mitigate OA on coral reefs should address not only global CO2 emissions but also local perturbations, in this case fish mariculture-induced eutrophication.
description: In order to allow full comparability with other ocean acidification data sets, the R package seacarb (Gattuso et al, 2021) was used to compute a complete and consistent set of carbonate system variables, as described by Nisumaa et al. (2010). In this dataset the original values were archived in addition with the recalculated parameters (see related PI). The date of carbonate chemistry calculation by seacarb is 2023-02-16.
DOI: 10.1594/pangaea.672973
title: Basic and other measurements of radiation at station Syowa (2001-02)
DOI: 10.1594/pangaea.972997
title: Basic measurements of radiation at station Langley Research Center (2024-09)
DOI: 10.1594/pangaea.973224
title: Basic and other measurements of radiation at station Syowa (2024-06)
DOI: 10.1594/pangaea.973227
title: Basic and other measurements of radiation at station Syowa (2024-03)
DOI: 10.1594/pangaea.973228
title: Basic and other measurements of radiation at station Syowa (2024-07)
DOI: 10.1594/pangaea.973229
title: Basic and other measurements of radiation at station Syowa (2024-05)
DOI: 10.1594/pangaea.973230
title: Basic and other measurements of radiation at station Syowa (2024-08)
DOI: 10.1594/pangaea.973231
title: Basic and other measurements of radiation at station Syowa (2024-09)
DOI: 10.1594/pangaea.963332
title: Snow density profiles at Kottaspegel traverse in 2018

description: This is a collection of shallow snow density data sets from research station Neumayer II, Neumayer III and the Kottas traverse between Neumayer, Kottas camp and Kohnen station. The original snow density data are available as Excel and txt files and as density-depth profiles in png format. The data were collected between 2001 and 2021. Measurements in 2019, (2020) and 2021 were taken on a monthly basis. Before this period, sampling took place on a rather irregular basis, but often once a year, at Neumayer station in most cases by members of the overwintering team, lead by the overwinterer for the air chemistry observatory (SPUSO). Sampling during the Kottas traverse was carried out by members of the traverse personnel. The sampling devices used were • conventional steal cylinders with a length of about 20 cm and an inner diameter of 6 cm and a wall thickness of 1 mm; the exact measurements were recorded in the protocols. Due to damage by ice layers the cylinders often have to be sharpened again and therefore become shorter over time ( (method listed in sensor.awi.de as awi_snow_sampler_3). • single-tube carbon fibre liners, as described in Schaller et al. (2016) with a length of 1 m and an inner diameter of around 10 cm and a wall thickness of 1 mm (method listed in sensor.awi.de as awi_snow_sampler_2); • dual-tube carbon liner probing system developed by Dallmayr et al. (2020) (method listed in sensor.awi.de as awi_snow_sampler_1). More details about sampling event nomenclature is provided below in the file description. For the steal cylinder sampling method, sample density was determined for individual depth sections, thus providing a stratigraphic density profile. For both liner methods, density was determined as the bulk density, i.e. the average density of the whole snow core sampled with the carbon liner tube. If it was possible to remove the snow core in a mostly intact way from the liner, it was cut into samples in a aluminium tray, as described in Schaller et al. (2016). This also eventually provides a density profile. Sample depth vary, as thick ice layers often inhibit deeper penetration with either method. In some cases, the carbon liner was damaged, resulting in a non-cylindrical form of the snow sample. Such events were noted in the protocols and an attempt made to correct the density accordingly. A description of the density data sets' is provided in the MSc thesis by Cedric Hecht under supervision of Olaf Eisen.
DOI: 10.1594/pangaea.753616
title: Basic and other measurements of radiation at station Syowa (2009-12)