cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Efficient prediction of propeller noise at incidence
Creators: name: Yunus, Furkat
name: Casalino, Damiano
name: Romani, Gianluca
name: Snellen, Mirjam
Publisher: name: University of Salford
Year: 2024
Subjects: classificationCode: 401701
subject: Acoustics and noise control (excl. architectural acoustics)

description: This paper investigates the prediction accuracy and time efficiency of two distinctlow-order methods, Opty∂B and LOPNOR, for predicting tonal and broadband noise ofa drone rotor in axial and non-axial flow conditions. These are both derived from an aerodynamicrotor model based on the blade element momentum theory, respectively coupledwith a time- (Opty∂B ) and frequency-domain (LOPNOR) solution of the Ffowcs Williams-Hawkings (FW-H) integral equation applied to a radial distribution of acoustically compactand non-compact sources. Experimental data and scale-resolving lattice-Boltzmann/verylargeeddy simulation (LB/VLES) results for a two-bladed small unmanned aerial system(sUAS) in transitional boundary layer conditions are used to validate the low-order approaches.Comparison between low-order, high-fidelity and experimental results reveal thatthe underlying sound generation mechanisms are accurately modelled by the low-fidelitymethods, which therefore constitute a valid tool for preliminary design of quiet drone rotorsor to estimate the noise impact of drone operations.
title: Hydrologic and Hydrochemical Results from Pumping Tests Conducted at the 11-14 Pond, Pantex Plant, Texas
Creators: name: Mullican, William F.
name: Mace, Robert E. (Robert Earl), 1967-
name: Dutton, Alan R.
Publisher: name: The University of Texas at Austin
Year: 1995
Subjects: subject: groundwater
subject: geochemistry
subject: pumping tests
subject: Pantex Plant
subject: Texas

description: Results from pumping tests conducted in monitoring wells located at the 11-14 pond significantly increase our understanding of the hydrogeology of perched aquifers at the Pantex Plant, the U.S. Department of Energy weapons plant serving as the final assembly and disassembly point for the nuclear arsenal and also as a test facility for high explosives. The mean transmissivity and hydraulic conductivity calculated for all four wells based on delayed yield analyses were 488 ± 250 ft^2 d^-1 and 33.8 ± 17.9 ft d^-1 (45.3 ± 23.2 m^2 d^-1 and 10.3 ± 5.4 m d^-1), respectively. On the basis of these hydraulic conditions, a ground-water velocity in the 11-14 pond area of 0.85 ft d^-1 (0.26 m d^-1) was calculated. Results of chemical analyses on water samples collected at three different times during the pumping test were relatively consistent. This consistency indicates that, within the volume of the perched aquifer from which water was pumped, no compositional stratification or lateral compositional trends could be conclusively identified.
title: Geologic Characterization and Coalbed Methane Occurrence: Williams Fork Formation, Piceance Basin, Northwest Colorado
Creators: name: Tyler, Roger
name: Kaiser, W. R.
name: McMurry, Ronald G.
Publisher: name: The University of Texas at Austin
Year: 1995
Subjects: subject: coalbed methane
subject: Williams Fork Formation
subject: Piceance Basin
subject: Colorado

description: The coal-bearing Upper Cretaceous Williams Fork Formation, 1,200 to 2,500 ft thick, is operationally defined on the basis of correlation with the Sand Wash Basin. Net coal thickness is typically 80 to 120 ft and is thickest in a north-south belt west of the Divide Creek Anticline. Depositional setting and thrust faults cause coals along the Grand Hogback and in the subsurface to be in modest to poor hydraulic communication. Thus, meteoric recharge and flow basinward is restricted. Face cleats of Late Cretaceous age strike east-northeast and west-northwest in the southern and northern parts of the basin, respectively, normal to the Hogback thrust front. Parallelism between face-cleat strike and present-day maximum horizontal stress direction may enhance coal permeability in the north. Lineament azimuths lie between 20 to 40° and 280 to 310°; they are not a reliable indicator of subsurface fracture attributes nor of gas production. In the Grand Valley/Rulison and White River/Pinyon Ridge areas, structure and sandstone development control gas production from Cameo coals and/or sandstones. The most productive wells are on structural terraces and anticlines or correspond to Cameo sandstone development, reflecting fracture-enhanced permeability. As predicted, from an evolving coalbed methane producibility model, extraordinary coal-gas production is precluded by the absence of dynamic groundwater flow. The best potential for coal-gas production may lie in conventional traps basinward of where outcrop and subsurface coals are in good hydraulic communication.
title: Fachkompetenz von Wirtschaftslehrerinnen und -lehrern
title: Untersuchungen zur Entwicklung eines bedarfsdiagnostischen Instruments
titleType: Subtitle
Creators: name: Bank, Volker
name: Retzmann, Thomas
Publisher: name: Digitale Wirtschaftsbildung (Digital Economic Education)
Year: 2013

description: Zeitschrift für ökonomische Bildung, 1
title: The Beauty-Contest-Game
title: Wirtschaftsdidaktische Lerndiagnostik mit Hilfe eines spieltheoretischen Unterrichtsexperimentes
titleType: Subtitle
Creators: name: Mittelstädt, Ewald
name: Sender, Till
name: Liening, Andreas
Publisher: name: Digitale Wirtschaftsbildung (Digital Economic Education)
Year: 2013

description: Zeitschrift für ökonomische Bildung, 1
title: Geologic and Hydrogeologic Framework of Regional Aquifers in the Twin Mountains, Paluxy, and Woodbine Formations Near the SSC Site, North-Central Texas
Creators: name: Dutton, Alan R.
name: Mace, Robert E. (Robert Earl), 1967-
name: Nance, Hardie Seay, 1948-
name: Blum, Martina U.
Publisher: name: The University of Texas at Austin
Year: 1996
Subjects: subject: groundwater
subject: aquifers
subject: Twin Mountains Formation
subject: Paluxy Formation
subject: Woodbine Formation
subject: Superconducting Super Collider
subject: Texas

description: Water-utility districts and many municipalities in North-Central Texas recently obtained as much as 100 percent of their water supply from deep regional aquifers in Cretaceous formations. Use of groundwater from the aquifers during the past century has resulted in water-level declines of as much as 850 ft (259 m), especially in Dallas and Tarrant Counties. Future water-level changes will depend on the amount of groundwater produced to help meet growing water-supply needs for municipalities, industries, and agriculture throughout North-Central Texas. It is probable that a significant part of the increased water demand will be met by groundwater although at less than historic rates. The objective of this study was to develop a predictive tool for studying the effect of future groundwater production from regional aquifers in North-Central Texas. To do this, we reviewed the history of groundwater development, hydrogeology of the regional aquifers, and constructed numerical models of groundwater flow. A cross-sectional model of both aquifers and confining layers was used to evaluate model boundary conditions and the vertical hydrologic properties of the confining layers. Results and insights from the cross-sectional model were used in a three-dimensional simulation of groundwater flow in the deep aquifers. The layers of the regional confining system were not explicitly included in the three-dimensional model. Hydrogeologic properties were assigned on the basis of aquifer test results and stratigraphic mapping of sandstone distribution in the aquifer units.
title: Calculation of Texas Lignite Resources Using the National Coal Resources Data System
Creators: name: Kaiser, W. R.
Publisher: name: The University of Texas at Austin
Year: 1996
Subjects: subject: lignite
subject: resources
subject: Texas
subject: National Coal Resources Data System

description: Calculation of Texas lignite resources, according to U.S. Geological Survey (USGS) methodology, using the National Coal Resources Data System (NCRDS) and software, began in 1979 and is now complete with reporting here of resources in three new regions—Jackson-Yegua east, Jackson south, and Wilcox south. In these regions, site files containing well locations and total lignite thicknesses were created using Ingres, a relational database software. Resources were calculated using the Geographic Resources Analysis Support System (GRASS) GIS. Texas lignite resources were calculated from a database of 4,700 density and lithologic logs in terms of three USGS thickness categories (2.5 to 5 ft, >5 to 10 ft, and > 10 ft) and one Bureau of Economic Geology (BEG) category (≥3 ft). NCRDS resources, calculated using USGS methodology, total 46,979 million tons, of which 15,767 million tons (34 percent) are demonstrated resources. Most of them are in beds 2.5 to 5 ft thick. Two-thirds of the resources are in the Wilcox trend and one-third in the Jackson-Yegua trend. The state's richest lignite regions are Jackson-Yegua east and Wilcox east-central. In a comparison of NCRDS and BEG resource estimates, made using the same database and thickness category (≥ 3 ft), the USGS inflated inferred resources, whereas the BEG, using geologic models, constrained inferred resources and maximized demonstrated resources, which are 13,691 and 20,383 million tons, respectively. The USGS method is highly data dependent and can make no allowance for demonstrated resources as defined and estimated by the BEG with moderate certainty using geologic models. The computerized and geologic methods could be combined to improve resource estimates from limited data.
title: Unternehmerisch handeln macht Schule
title: Legitimation, Voraussetzungen und Ergebnisse einer Entrepreneurship Education in der Sekundarstufe II
titleType: Subtitle
Creators: name: Bijedic, Teita
Publisher: name: Digitale Wirtschaftsbildung (Digital Economic Education)
Year: 2013

description: Zeitschrift für ökonomische Bildung, 1
title: Kompetenzmessung im Bereich financial literacy
title: Ergebnisse zum Umgang mit Online-Rechnern aus der FILS-Studie
titleType: Subtitle
Creators: name: Schürkmann, Susanne
name: Schuhen, Michael
Publisher: name: Digitale Wirtschaftsbildung (Digital Economic Education)
Year: 2013

description: Zeitschrift für ökonomische Bildung, 1
title: Targeting reserve growth opportunities in the northern Gulf of Mexico Basin: transferring secondary gas recovery technology to the offshore environment - Book 1
Creators: name: Hentz, Tucker F.
name: Zeng, Hongliu
name: Wood, Lesli J.
name: Kilic, Cem O.
name: Yeh, Joseph S.
name: Skolnakorn, J.
name: DeAngelo, M. V.
Publisher: name: The University of Texas at Austin
Year: 1999
Subjects: subject: Secondary gas recovery
subject: Gulf of Mexico Basin
subject: technology transfer
subject: offshore environment

description: The Bureau of Economic Geology's Offshore Secondary Gas Recovery project is a multi-fiscal-year project funded by the U.S. Department of Energy, whose goal is to identify additional natural gas resources in a major field in the northern Gulf of Mexico Basin through multidisciplinary field and reservoir characterization study. Phases 1 and 2 of the project work plan (Project Preparation and Data Gathering and Loading, respectively) are nearly complete and scheduled to be completed by the end of October 1999. Phase 3 of the plan (Data Analysis) is well underway, and a list of preliminary leads is currently being compiled to convey to our industry partner. Reservoir tops have been spotted to facilitate production evaluation and recompletion opportunity. Key regional sequence surfaces have been identified in well logs and seismic, and mapping is being completed in the seismic dataset. Some of these surfaces have provided horizons to initiate a continuity processing of the seismic data volume for mapping depositional architecture. Well log interpretation of stacking patterns and systems tracts is well underway. Correlation surfaces have been compiled, and cross sections have been generated and interpreted for depositional elements. These data are being integrated with seismic data via Landmark® software. The project is on track within its projected timeframe, and additional personnel are being added as per the technical analysis plan. The key objective in the next fiscal year is to do the bulk of the technical analysis, focusing on generating a prioritized portfolio of infill and exploration prospects. Direct hydrocarbon indicator (DHI) modeling and analysis, continuity and impedance analysis, a general attribute interpretation of the seismic data, continued log-facies and parasequence interpretation, fault-seal analysis, and rigorous petrophysical analysis of well data are critical components of this objective.
Evaluation of efficiency of GIS-based river training for flood control: A case study of River Asu Umunaga in Nigeria
Creators: name: Alfa, Meshach
name: Adie, D.B.
name: Yarosan, H.B.
name: Ovuarume, B.U.
Publisher: name: Loughborough University
Year: 2024

description: This record contains an extended abstract and MP4 presentation. Presented at the 43rd WEDC International Conference.
title: Reduction of Greenhouse Gas Emissions through Underground CO2 Sequestration in Texas Oil and Gas Reservoirs
Creators: name: Holtz, Mark H.
name: Nance, Peter K.
name: Finley, Robert J.
Publisher: name: The University of Texas at Austin
Year: 1999
Subjects: subject: Carbon dioxide sequestration
subject: greenhouse gas emissions
subject: Texas oil and gas reservoirs
subject: climate change

description: Today, energy and environmental questions are often viewed from conflicting perspectives. However, perhaps there are solutions to some of these problems that can satisfy multiple objectives. This report explores the technical feasibility and economic potential for capturing CO2 from coal- or lignite-fired utility boilers and applying the CO2 as an enhanced oil recovery (EOR) process in the mature oil provinces of Texas. This capture accomplishes twin goals—sequestering a substantial amount of CO2 for an extended period and increasing the efficiency of oil recovery. The types of CO2 sources are diverse. To mitigate their impact, a number of management strategies are available, ranging from effluent reduction to capture and sequestration. One alternative is to utilize mature oil reservoirs to form a set of sequestration reservoirs. From the oil production side, one challenge for the domestic oil industry during the next millennium will be to profitably employ advanced technology to increase resources from existing reservoirs. Many advanced recovery strategies hold potential for accomplishing this goal. One promising area is enhanced oil recovery through the use of CO2 flooding. The potential incremental oil production from these methods is significant.
title: Kooperationen zwischen Schulen und Unternehmen gestalten
title: Befunde aus der Untersuchung eines Einzelfalls in der Entrepreneurship Education
titleType: Subtitle
Creators: name: Hofhues, Sandra
Publisher: name: Digitale Wirtschaftsbildung (Digital Economic Education)
Year: 2013

description: Zeitschrift für ökonomische Bildung, 1
title: 1998 Annual Report - Year One: Geo-Environmental Characterization of the Delta del Orinoco, Venezuela
Creators: name: Raney, J. A.
Publisher: name: The University of Texas at Austin
Year: 1999
Subjects: subject: Orinoco Delta
subject: Venezuela
subject: geo-environmental characterization
subject: environmental baseline

description: The 1998 Annual Report for the project "Geo-Environmental Characterization of the Delta del Orinoco" describes the first year of work by the Bureau of Economic Geology (Bureau) at The University of Texas at Austin. The five-year project is funded by the Coordinación Desarrollo Económico de Oriente (DAO) of Petróleos de Venezuela, S.A. (PDVSA). PDVSA/DAO is supporting this work in the Orinoco Delta so that development of hydrocarbon resources and other projects for the benefit of the people of Venezuela can proceed with a minimum of adverse impacts in this ecologically diverse and sensitive area. Key to this effort is establishing an accessible baseline of environmental data and developing an understanding of the physical and biological dynamics of the delta system. This information is essential for anticipating the consequences of natural and human-induced changes in the environment of the Delta. The Bureau's role is to conduct technical studies, support collateral investigations by Venezuelan participants, assist DAO with technical coordination and program development, integrate the results of the various studies for public dissemination, and facilitate other technology transfer and institutional strengthening activities. Much was accomplished during 1998. Working concert with DAO, Bureau personnel assisted in the definition of related environmental studies, met with Venezuelan project participants to share initial results and coordinate planned activities, conducted joint field studies to collect data and observations, and helped DAO obtain international support for the investigations. Many of the issues encountered during 1998, such as many aspects of field logistics, were successfully resolved so that studies in subsequent phases of the project can proceed efficiently.
title: Einflussfaktoren bei der Berufswahl
title: Eine Analyse der Berufswünsche von Schülern am Ende der Sekundarstufe I
titleType: Subtitle
Creators: name: Oberste, Michael
Publisher: name: Digitale Wirtschaftsbildung (Digital Economic Education)
Year: 2013

description: Zeitschrift für ökonomische Bildung, 1
title: Geology of Mosquitia and Tela Basins, Honduras
Creators: name: Sanchez-Barreda, L. A.
Publisher: name: The University of Texas at Austin
Year: 1999
Subjects: subject: Geology
subject: FOS: Earth and related environmental sciences
subject: Mosquitia Basin
subject: Tela Basin
subject: Honduras

description: Although the Mosquitia and Tela Basins are two of the better-explored sedimentary basins of Honduras, they are still underexplored compared with other basins in the general region. The Tela Basin is composed of three en echelon, narrow depocenters, resulting from extensional tectonics that initiated in the Oligocene. These depocenters were filled primarily by turbidite sedimentation that exceeds some 4,000 meters in thickness. The Mosquitia Basin is separated from the Tela Basin by a major regional, down-to-the-north, strike-slip fault. More than 75 percent of the basin lies in eastern Honduras, and the rest in Nicaragua. The basin's main depocenter is located near the Honduran-Nicaraguan border and is filled with some 9,000 meters of Upper Cretaceous and Tertiary sediments. Both the structural and stratigraphic framework of these two basins are intimately related to the evolution of the Chortis block as the block moved from its original position attached to southwestern Mexico to its present location as part of the Caribbean plate. The Mosquitia Basin consists of three tectonic elements—the onshore Mosquitia Basin, the Mosquitia Platform, and the offshore Mosquitia Basin. Paleozoic strata are poorly understood in this region, but investigators have suggested that these rocks were affected by at least three episodes of deformation. The Chortis block was displaced into the present-day Caribbean during the Mesozoic, and displacement was followed by a suturing event as the Maya and Chortis blocks collided. This collision produced a regional compressional event, imparting a northwest structural grain and affecting both the onshore and offshore portions of the basin.
title: Kompetenzorientierung in der Berufsbildung
title: Ein Modellversuch im Spektrum zwischen Input-, Prozess- und Produktqualität
titleType: Subtitle
Creators: name: Schopf, Christiane
name: Müllauer-Hager, Barbara
Publisher: name: Digitale Wirtschaftsbildung (Digital Economic Education)
Year: 2013

description: Zeitschrift für ökonomische Bildung, 1
Experimental and Numerical Study of Leading-Edge Tubercles on a Propeller Blade.
Creators: name: Majid, Saif
name: Toomer, Chris
Publisher: name: University of Salford
Year: 2024
Subjects: classificationCode: 401701
subject: Acoustics and noise control (excl. architectural acoustics)

description: The conducted research investigates using leading-edge tubercles as a form ofpassive flow control device on a propeller blade. These blades are hypothesised to reducenoise propagation and have potential benefits to the blade efficiency. The investigationmakes use of experimental testing of the conventional design against the tubercles withadditional testing against commercial market propellers, using a wind-tunnel and anechoicchamber. During experimental testing, the outcomes of static tests produce 21% increasein thrust, 19.6% reduction in noise sample peak level, achieved. During dynamic testingfrom the addition of the tubercles tested against several sets of propellers. Subsequently,simulation tests conducted in CFD have been optimized to use pressure based unsteadyflow simulation, utilizing, realisable k-ε for the aerodynamic investigation and for the aeroacoustics, Large Eddy numerical simulations for validation, showing good correspondenceof the results presented. The data attained from the results would provide to be beneficial,for future VTOL companies, which require lower noise emissions, with beneficial thrust valuesfor take-off and landing to operate in urban environments, to provide ideal performanceand cleaner emissions. The benefit of the attained data would provide to be beneficial fornext generation future eVTOL aircraft, requiring lower noise emissions, with beneficial thrustvalues for take-off and landing, operating within urban environments, by providing cleaneremissions whilst providing ideal performance.
title: Lehramt Sozialwissenschaften - Warum wählen Studierende dieses Fach?
title: Warum wählen Studierende dieses Fach?
titleType: Subtitle
Creators: name: Schürkmann, Susanne
name: Schuhen, Michael
name: Kibedi Von Varga, Karen
Publisher: name: Digitale Wirtschaftsbildung (Digital Economic Education)
Year: 2014

description: Zeitschrift für ökonomische Bildung, 2
Evaluation of multi-drone sound source tracking algorithms
Creators: name: Yen, Benjamin
name: Yamada, Taiki
name: Itoyama, Katsutoshi
name: Nakadai, Kazuhiro
Publisher: name: University of Salford
Year: 2024
Subjects: classificationCode: 401701
subject: Acoustics and noise control (excl. architectural acoustics)
classificationCode: 400607
subject: Signal processing
classificationCode: 400199
subject: Aerospace engineering not elsewhere classified

description: This study reviews and evaluates methods for sound source tracking using multiple microphone array-equipped drones. These previous studies performed multi-drone sound source tracking by the MUltiple SIgnal Classification (MUSIC) algorithm with various ways to triangulate localisation outputs from each drone. Recently, techniques to reduce the influence of drone rotor noise have also been explored, such as using a rotor noise reduction Wiener filter and noise correlation matrix estimation. In addition, methods to navigate the drones to optimise microphone array placement have also been demonstrated. Here, we evaluate the performance of these methods and demonstrate whether improvements can be made by combining components proposed in recent studies.
title: Saturated Thickness in the Ogallala Aquifer in the Panhandle Water Planning Area—Simulation of 2000 through 2050 Withdrawal Projections
Creators: name: Dutton, Alan R.
name: Reedy, R. C.
name: Mace, Robert E. (Robert Earl), 1967-
Publisher: name: The University of Texas at Austin
Year: 2000
Subjects: subject: Ogallala Aquifer
subject: Texas Panhandle
subject: saturated thickness
subject: groundwater model
subject: withdrawal projections

description: The Ogallala aquifer is one of Texas' major aquifer systems. This study focused on the part of the Ogallala aquifer that underlies 18 of the 21 counties of the Panhandle Water Planning area (PWPA). In the past 50 years, water-level drawdown in parts of the unconfined aquifer has been as much as 190 feet, or about 4 feet per year. Pumping rates for the next 50 years to 2050 have been projected to be greater than previous rates, and additional drawdown is possible. A numerical, or computer, model of the occurrence and movement of groundwater in the Ogallala aquifer was developed to predict future water-level changes. Model development was part of a state-wide process of developing water-resource management plans under Senate Bill 1, 75th Texas Legislative Session. This model improved on previous models by (1) covering the Ogallala aquifer within most of each county in the PWPA with detailed resolution, (2) using as much as possible spatially controlled geologic and hydrologic data, and (3) placing model edges to minimize their effects on the area of interest in Texas. The model is intended to be used as a tool to assess surpluses and deficits in aquifer resources and to evaluate water management strategies that might address resource deficits.
title: Schwellenkonzepte und Phänomenografie
title: Explorative Studie zur Messung von Unterschieden im ökonomischen Verstehen
titleType: Subtitle
Creators: name: Kricks, Kristina
name: Mittelstädt, Ewald
name: Liening, Andreas
Publisher: name: Digitale Wirtschaftsbildung (Digital Economic Education)
Year: 2014

description: Zeitschrift für ökonomische Bildung, 2
Extensions to wireless DetNet - IAFA#4 - Standardisation
Creators: name: Bernardos, Carlos. J
Publisher: name: Zenodo
Year: 2024
Subjects: SNS
JU
DetNet
standards
PREDICT-6G
6G

description: The presentation "Extensions to wireless DetNet" was delivered by Carlos J. Bernardos (UC3M) in the context of the event "IAFA EVENT SERIES #4. 2 - Interim Steps: 6G Standardisation Requirements". This is the second of a three-event series on standardisation organised by SNS JU  as part of its Impact Assessment and Facilitation Action (IAFA) initiative, in collaboration with ETSI and HSBooster.eu.
title: Characterization of Bedded Salt for Storage Caverns—A Case Study from the Midland Basin, Texas
Creators: name: Hovorka, Susan D.
name: Nava, Robin C.
Publisher: name: The University of Texas at Austin
Year: 2000
Subjects: subject: Bedded salt
subject: storage caverns
subject: Midland Basin
subject: Texas
subject: geology
subject: case study

description: The geometry of Permian bedded salt in the Midland Basin is a product of interaction between depositional facies and postdepositional modification by salt dissolution. Mapping high-frequency code patterns in cross-section and map view using wireline logs documents the salt geometry. Geologically based interpretation of depositional and dissolution processes provides a powerful tool for mapping the geometry of salt to assess the suitability of sites for the development of solution-mined storage caverns. In addition, this process-based description of salt geometry complements existing data about the evolution of one of the best-known sedimentary basins in the world and can serve as a genetic model to assist in interpreting other salt basins. Solution-mined caverns in salt in the Midland Basin Salado Formation are low-cost, large-volume storage facilities used for chemical feedstock. Caverns are also created when salt is dissolved to produce NaCl brine for drilling mud and other applications. Recently, solution-mined caverns have been used for the disposal of oil-field wastes. This log-based regional analysis of salt character provides basic descriptive information on the geometry of salt needed to site and regulate the development, use, and decommissioning of these facilities in the context of an exploration of facies relationships and implications for depositional history in this part of the Permian Basin.
UAV identification from acoustic signals using statistical learning: A state-of-the-art
Creators: name: Purier, Antoine
name: Bouley, Simon
name: Pinel-Lamotte, Lucille
Publisher: name: University of Salford
Year: 2024
Subjects: classificationCode: 510301
subject: Acoustics and acoustical devices; waves
classificationCode: 401701
subject: Acoustics and noise control (excl. architectural acoustics)
classificationCode: 400607
subject: Signal processing
classificationCode: 400906
subject: Electronic sensors

description: Over the last few years, the deployment of Unmanned Aerial Vehicles (UAVs) has sky-rocketed, pushed by the ever-growing range of commercial applications and various malicious purposes. In order to protect sensitive facilities and public areas, their effective and prompt localization and identification is necessary. As no modality (electro-optical, radio, etc.) is yet able to single-handedly perform both of these tasks, a combination of several sensors is required to fulfill these objectives under all real life conditions. Among the different modalities, acoustics relies on pressure signals captured by single microphones or phased arrays to carry out these tasks and has proven its detection efficiency for short distances. Whereas the localization step can be achieved by a set of well-known techniques widely described in the literature, the identification stage has not reached the same level of maturity. Therefore, this paper focuses on the latter and aims at presenting a state-of-the-art of classification techniques based on statistical learning and dedicated to UAV acoustic signatures. Additionally, a specific care is taken to assess the suitability of the reviewed techniques to real life conditions and requirements.
title: Der regionale Wirtschaftsraum als sozialer Aneignungsraum für Schülerinnen und Schüler
title: Konzeptionelle Überlegungen und empirische Befunde
titleType: Subtitle
Creators: name: Friebel, Stephan
name: Kirchner, Vera
name: Loerwald, Dirk
Publisher: name: Digitale Wirtschaftsbildung (Digital Economic Education)
Year: 2014

description: Zeitschrift für ökonomische Bildung, 2
title: Evaluation of Electromagnetic Induction as a Noninvasive Technique for Monitoring Water Movement into and Beneath Waste Disposal Facilities
Creators: name: Reedy, R. C.
name: Scanlon, Bridget R.
Publisher: name: The University of Texas at Austin
Year: 2000
Subjects: subject: Electromagnetic induction
subject: water movement monitoring
subject: waste disposal facilities
subject: environmental monitoring

description: The purpose of this study was to evaluate the use of electromagnetic induction to noninvasively monitor water content in waste disposal facility cover soils. We compared apparent electrical conductivity measurements monitored with the EM38 ground conductivity meter with water content monitored with a neutron probe at 20 locations over an 18-month period from August 1998 to January 2000. Two cover designs were monitored: a gel/asphalt barrier at 1.3 m depth and a capillary barrier at 2.0 m depth. The EM38 instrument was operated in both the vertical and horizontal dipole modes with the instrument resting on the ground surface and all data were normalized to 25°C. Linear regression techniques were applied to analyze the survey data. Water content to a depth of 0.75 m was correlated with horizontal dipole mode data and water content to depths of 1.1 m and 1.5 m was correlated with vertical dipole mode data. Initially higher water content values decreased by an average of 0.10 m^3/m^3 in the top 0.75 m and an average of 0.07 m^3/m^3 in the top 1.5 m over the course of the study. The regression model of the EM38 vertical dipole mode data with water content to the 1.5 m depth for all locations monitored on the capillary barrier design resulted in a standard deviation of 0.016 m^3/m^3. Horizontal dipole mode data correlated with water content to the 0.75 m depth had a standard deviation of 0.022 m^3/m^3 for all locations on both barrier designs. Models at individual survey locations generally exhibited much smaller standard deviations, ranging from 0.005 to 0.018 m^3/m^3 and averaging 0.010 m^3/m^3. The smaller standard deviations and general similarity of regression slope values of the models at individual locations indicate that this technique is more accurate as an indicator of changes in water content than as an indicator of the absolute value of water content at a given location. Sources of variability were attributed to horizontal and vertical variation in soil salinity, the vertical distribution of water at the time of a particular survey, and subtle differences in topsoil thickness and surface roughness. Results indicate that electromagnetic induction is useful for evaluating infiltration. The EM technique resulted in standard deviation values for water content similar to those of the neutron probe method but is capable of monitoring larger areas much more rapidly and at a lower cost.
title: Best Practice Guide for the Registration of Resources with da|ra
title: Best Practice Guide for the Registration of Resources with da|ra
Creators: name: Helbig, Kerstin
name: Hausstein, Brigitte
Publisher: name: GESIS - Leibniz Institute for the Social Sciences
publisherIdentifier: https://ror.org/018afyw53
publisherIdentifierScheme: ROR
Year: 2014
Subjects: subject: data documentation
subject: data quality
subject: data

description: Der Best Practice Guide gibt Hinweise und stellt hilfreiche Informationen gesammelt zur Verfügung. Themen wie Daten- und Metadatenqualität sowie die korrekte Zitation von Datensätzen und anderen Ressourcen werden angesprochen, aber auch Ratschläge zur Versionierung sind enthalten. Darüber hinaus enthält der Best Practice Guide Informationen zur DOI-Registrierung von Ressourcen via da|ra.
description: The Best Practice Guide gives advice and provides helpful information in a concentrated manner. Topics such as data and metadata quality as well as the correct citation of datasets and other resources are mentioned, but also advice on versioning is included. In addition, the Best Practice Guide contains information about DOI registration of resources via da|ra.
description: GESIS-Technical Reports 2014/18
description: GESIS-Technical Reports 2014/18
description: GESIS - Technical Reports, 2014/18
description: GESIS - Technical Reports, 2014/18
title: Site Investigation and Preliminary Assessment of the Colorado River Seep Site in Wharton County, Texas (RRC CU# 03-51041)
Creators: name: Smyth, Rebecca C.
name: Dutton, Alan R.
name: Gutiérrez, Roberto, 1951-
Publisher: name: The University of Texas at Austin
Year: 2000
Subjects: subject: Colorado River Seep Site
subject: Wharton County
subject: Texas
subject: site investigation
subject: environmental impact

description: The University of Texas at Austin, Bureau of Economic Geology (BEG), investigated the Colorado River Seep site near the border of Wharton and Matagorda Counties for the Railroad Commission of Texas (RRC) in July and August 1999. The area of concern occupies 0.03 mi2 (0.07 km2) on the H. C. Cockburn lease adjacent to the east bank of the Colorado River. The RRC and Magnet-Withers field operators have attempted to identify possible sources of the crude-oil seep since 1992; however, there have been no conclusive findings. The objectives of this study were to (1) characterize the extent of hydrocarbon impacts, (2) determine whether further work is needed to eliminate possible hydrocarbon sources, and (3) produce a summary report containing results of the field investigation. The scope of work consisted of collecting continuous cores and installing groundwater monitoring wells in 12 boreholes, located as to assess each of several possible sources of the crude oil: • a plugged and abandoned oil well, • two tank batteries, and • as many as four former surface pits that are reported to have been used for oil storage, salt-water storage, or drilling-mud containment. Data from both this and previous studies indicate that crude oil impacts several locations within the study area, but not all of them are related to the currently observed crude-oil seep.
title: Late Cenozoic Faults of the Region Surrounding the Eagle Flat Study Area, Northwestern Trans-Pecos Texas
Creators: name: Collins, Edward W.
name: Raney, J. A.
Publisher: name: The University of Texas at Austin
Year: 1993
Subjects: subject: faults
subject: Cenozoic
subject: Eagle Flat
subject: Trans-Pecos Texas

description: The Eagle Flat study area is located along the southeastern edge of the southern Basin and Range-Rio Grande tectonic province in Trans-Pecos Texas. The desert region that encompasses the study area consists of the broad Diablo Plateau and a series of mountain ranges and adjacent intermontane basins that formed by extensional faulting that probably occurred in the last 24 mya. There has been no historical surface rupturing of faults in Trans-Pecos Texas, although earthquakes have occurred and faults that displace Quaternary (present to approximately 2 mya) deposits are present (fig. 1). Geologic investigations of faults active during the Quaternary provide important data (tables A-1 and A-2) for seismic risk studies of the proposed Eagle Flat low-level radioactive waste repository. Most of the Quaternary faults of Trans-Pecos Texas are between about 11 and 24.8 mi (18 and 40 km) long (table A-1). Many of the faults are sections of longer fault zones that are between 43 and 64 mi (70 and 105 km) long. Strikes of individual faults are variable, although most of the fault zones strike northwestward or northward. Faults dip between 50° and 89°. Fourteen Quaternary faults are within 31 mi (50 km) of the proposed repository.
Numerical Simulations of Large-Scale Turbulence Ingestion in Forward Flight Propellers
Creators: name: Trascinelli, Leone
name: Hanson, Liam
name: Romani, Gianluca
name: Casalino, Damiano
name: Zang, Bin
name: Y. Zhou, Beckett
name: Azarpeyvand, Mahdi
Publisher: name: University of Salford
Year: 2024
Subjects: classificationCode: 401701
subject: Acoustics and noise control (excl. architectural acoustics)

description: Urban air mobility (UAM) vehicles are likely to encounter flow with high levels of turbulence,arising from the atmospheric flow interacting with obstructions in an urban setting.Therefore, understanding the effects of rotor-ingested turbulence on the aerodynamic noiseof propellers is crucial for the optimization of flight operations. The present study employsnumerical simulations to examine the aerodynamic and aeroacoustic performance of a propelleringesting wake turbulence induced by a circular cylinder, producing two-dimensional,large-scale vortical structures which impinge upon the rotating propeller. The simulationwas conducted using Lattice-Boltzmann/Very-Large Eddy Simulation solver, PowerFLOW®,coupled with FW-H acoustic analogy. The numerical approach has been validated in earlierstudies and the simulation agrees well with experimental results for both aerodynamic andaeroacoustic characteristics. Flow field results reveal a significant rise in turbulence levelsnear the blades, which indicate an elevated level of turbulence interaction noise. This correspondswell with the significantincrease in broadband noise components when compared tothe isolated propeller, showing haystacking around the blade pass frequency.
Empirical models to describe UAV tonal dynamics during real operations
Creators: name: Andino Cappagli, Camilo
name: Amiri-Simkooei, Alireza
name: Snellen, Mirjam
Publisher: name: University of Salford
Year: 2024
Subjects: classificationCode: 401701
subject: Acoustics and noise control (excl. architectural acoustics)
classificationCode: 400199
subject: Aerospace engineering not elsewhere classified

description: Over the last decade, the aerospace industry has experienced a remarkable growth in the use of Unmanned Aerial Vehicles (UAVs) due to their low manufacturing and operational costs, adaptability, and scalability. In the context of climate change and desired emissions targets, UAVs are realistic options to complement the current freight transportation methods, and in the future, as an viable option for human mobility. UAVs are also starting to gain a place in emergency response, both in urban and rural areas, where aid or surveillance capabilities are required in short notice and a fast response is crucial. However, an important obstacle towards their broader use is the expected noise annoyance caused by UAV operations. In this study, we combine extensive outdoor measurements of drone noise with statistical modelling to predict acoustic metrics relevant to determining acoustic annoyance. Array-based measurements combined with GPS positioning information of an eVTOL fixed-wing UAV are studied under realistic operational conditions in an open field. The linear least squares theory is used to establish an empirical model and identify a set of control parameters, including acceleration and velocity, that serve as effective predictors of noise output. The results pave the way for the establishing a model that predicts drone noise for different UAV types and for different operational conditions.
title: Wirtschaftsdidaktische Wirkungsforschung
title: Materialien zur ökonomischen Grundbildung im Praxistest
titleType: Subtitle
Creators: name: Schuhen, Michael
name: Weyland, Michael
name: Schürkmann, Susanne
name: Schlösser, Hans Jürgen
Publisher: name: Digitale Wirtschaftsbildung (Digital Economic Education)
Year: 2016

description: Zeitschrift für ökonomische Bildung, 4
title: Sources and Ages of Ground Water in Unconfined and Confined Aquifers Beneath the U.S. High Plains
Creators: name: Dutton, Alan R.
Publisher: name: The University of Texas at Austin
Year: 1994
Subjects: subject: aquifers
subject: sources
subject: age dating
subject: High Plains

description: Groundwater is a valuable resource in unconfined and confined aquifers beneath the U.S. High Plains, but little is known about its age or hydraulic history. Thirty-two samples of groundwater were collected for measurement of δ^18O, δD, Δ^14C, tritium, and ^36Cl/^Cl, as well as ionic constituents from the unconfined High Plains aquifer in the Ogallala Formation and from confined aquifers in various hydrostratigraphic units beneath the southern, central, and northern High Plains. All samples of unconfined and confined groundwaters plot along the meteoric water line. δ^18O and δD from the unconfined aquifer are consistent with the modern distribution of meteoric water across North America. δD and δ^18O from the confined aquifer likewise vary from south to north across the High Plains, but beneath the southern and central High Plains, mean compositions are lighter in the confined aquifer than in the unconfined aquifer. Beneath the northern High Plains, δD and δ^18O are the same or heavier in the confined aquifer than in the overlying unconfined aquifer. In combination, these trends show that the north-to-south range in stable isotopic compositions within the various confined aquifers is smaller than observed in the unconfined aquifer. Although age dates are uncertain, preliminary calculations suggest that unconfined groundwaters are probably less than 1,000 years old and locally as young as 25 years. Ages of groundwaters in the confined aquifers are between 20 and 32 ka and similar in the different study areas. Age of groundwater appears to increase along the inferred intrastratal flow path in the confined aquifers but is determined by leakage rate as well as lateral velocity. The range in isotopic composition in confined aquifers supports earlier findings that seawater temperature and patterns of atmospheric circulation during the Late Pleistocene were different from conditions affecting modern recharge across the High Plains.
title: Financial Literacy aus Sicht von Lehrpersonen an beruflichen Schulen in der Schweiz
title: Eine Mixed-Methods-Studie zu deren domänenspezifischen Vorstellungen
titleType: Subtitle
Creators: name: Leumann, Seraina
name: Aprea, Carmela
Publisher: name: Digitale Wirtschaftsbildung (Digital Economic Education)
Year: 2016

description: Zeitschrift für ökonomische Bildung, 4
title: Historische Spekulationen als Anlässe für ökonomische Bildungsprozesse
title: Konkretisiert am Beispiel des Tulpenfiebers im Holland des 17. Jahrhunderts
titleType: Subtitle
Creators: name: Asmussen, Sören
name: Löw Beer, David
Publisher: name: Digitale Wirtschaftsbildung (Digital Economic Education)
Year: 2016

description: Zeitschrift für ökonomische Bildung, 4
title: Sources and Ages of Ground Water in Unconfined and Confined Aquifers Beneath the U.S. High Plains
Creators: name: Dutton, Alan R.
Publisher: name: The University of Texas at Austin
Year: 1993
Subjects: subject: aquifers
subject: sources
subject: age dating
subject: High Plains

description: Groundwater is a valuable resource in unconfined and confined aquifers beneath the U.S. High Plains, but little is known about its age or hydrologic history. Thirty-two samples of groundwater were collected for measurement of δD, δ18O, δ13C, 14C, 3H, and 36Cl/Cl and ionic constituents from the unconfined High Plains aquifer in the Ogallala Formation and from confined aquifers in various hydrostratigraphic units beneath the southern, central, and northern High Plains. All samples of unconfined and confined groundwaters plot along the meteoric water line. Î´D and Î´18O from the unconfined aquifer are consistent with the Modern distribution of meteoric water across North America. δD and δ18O from the confined aquifer likewise vary from south to north across the High Plains, but beneath the southern and central High Plains mean compositions are lighter in the confined aquifer than in the unconfined aquifer. Beneath the northern High Plains, δD and δ8O are the same or heavier in the confined aquifer than in the overlying unconfined aquifer. In combination, these trends show that the north-to-south range in stable isotopic compositions within the various confined aquifers is smaller than observed in the unconfined aquifer. Although age dates are uncertain, preliminary calculations suggest that unconfined groundwaters are probably less than 1,000 years old and locally as young as 25 years. Ages of groundwaters in the confined aquifers are between 20 and 32 thousand years and similar in the different study areas. Age of groundwater appears to increase along the inferred intrastratal flow path in the confined aquifers but is determined by leakage rate as well as lateral velocity. The range in isotopic composition in confined aquifers supports earlier findings that seawater temperature and patterns of atmospheric circulation during the Late Pleistocene were different from conditions affecting Modern recharge across the High Plains.
Numerical Study of Noise Reduction on Looped Propeller Blades with Bio-inspired Tubercles
Creators: name: du Plessis, Justin
name: Bouferrouk, Abdessalem
name: Pontillo, Alessandro
Publisher: name: University of Salford
Year: 2024
Subjects: classificationCode: 401701
subject: Acoustics and noise control (excl. architectural acoustics)

description: This paper investigates the effect of looped propeller blades with bio-inspired sinusoidalleading-edge tubercles on the tonal noise generated. CFD simulations are conductedusing ANSYS Fluent, utilising a Detached Eddy Simulation flow model combined with aFfowcs Williams Hawkings model for acoustics. Further RANS simulations were conductedfor performance simulations in static and forward flight conditions. The findings show thatthe baseline looped propeller was able to reduce tonal noise emitted from the propeller, byup to 3.49dB at the blade passing frequency. It is also found that all the tested tubercle variationson the looped design can further reduce the tonal noise by 0.98dB at the blade passingfrequency. The results further show that the looped propellers and their tubercle variationsreduced the maximum thrust generated but were able to reduce the input power required atall tested velocities. This study’s findings demonstrate the potential of bio-inspired loopedpropellers for eVTOLs and UAVs operating in urban environments.