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Artykuły w czasopismach na temat „Fan UHBR”

Autor: Grafiati

Data publikacji: 7 września 2024

Data aktualizacji: 31 lipca 2025

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1

Natale, N., T. Egger, J. Friedrichs, and S. Russo. "Aerodynamic Analysis of a scaled UHBR Fan." IOP Conference Series: Materials Science and Engineering 1226, no. 1 (2022): 012007. http://dx.doi.org/10.1088/1757-899x/1226/1/012007.

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Abstract In the frame of the CA3ViAR Clean Sky 2 (Composite fan Aerodynamic, Aeroelastic, and Aeroacoustic Validation Rig), the main objective is to design a low-speed (low-transonic) fan typical of a future large aircraft UHBR engine, in terms of aerodynamic shaping as well as structural design and analysis to make sure the test article experiences aerodynamic and aeroelastic instabilities in an expected way during wind tunnel (WT) operations. Eventually, open access to all the produced models will be provided, with the objective to establish an “open test-case” for the whole European scienti

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Pagès, Valdo, Pierre Duquesne, Stéphane Aubert, et al. "UHBR Open-Test-Case Fan ECL5/CATANA." International Journal of Turbomachinery, Propulsion and Power 7, no. 2 (2022): 17. http://dx.doi.org/10.3390/ijtpp7020017.

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The application of composite fans enables disruptive design possibilities but increases sensitivity to multi-physical resonance between aerodynamic, structure dynamic and acoustic phenomena. As a result, aeroelastic problems increasingly set the stability limit. Test cases of representative geometries without industrial restrictions are a key element of an open scientific culture but are currently non-existent in the turbomachinery community. In order to provide a multi-physical validation benchmark representative of near-future UHBR fan concepts, the open-test-case fan stage ECL5 was develope

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Duquesne, Pierre, Quentin Rendu, Stephane Aubert, and Pascal Ferrand. "Choke flutter instability sources tracking with linearized calculations." International Journal of Numerical Methods for Heat & Fluid Flow 30, no. 9 (2019): 4155–66. http://dx.doi.org/10.1108/hff-06-2018-0281.

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Purpose The choke flutter is a fluid-structure interaction that can lead to the failure of fan or compressor blade in turbojet engines. In ultra high bypass ratio (UHBR) fans, the choke flutter appears at part-speed regimes and at low or negative incidence when a strong shock-wave chokes the blade to blade channel. The purpose of this study is to locate the main excitation sources and improving the understanding of the different work exchange mechanisms. This work contributes to avoiding deficient and dangerous fan design. Design/methodology/approach In this paper, an UHBR fan is analyzed usin

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Pinelli, Lorenzo, Maria Malcaus, Giovanni Giannini, and Michele Marconcini. "Some RANS Modeling Results of the UHBR Fan: The Case of ECL5/CATANA." International Journal of Turbomachinery, Propulsion and Power 10, no. 3 (2025): 17. https://doi.org/10.3390/ijtpp10030017.

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With the advancement of modern fan architectures, dedicated experimental benchmarks are becoming fundamental to improving the knowledge of flow physics, validating novel CFD methods, and fine-tuning existing methods. In this context the open test case ECL5/CATANA, representative of a modern Ultra High Bypass Ratio (UHBR) architecture, has been designed and experimentally investigated at École Centrale de Lyon (ECL) in a novel test facility with multi-physical instrumentation, providing a large database of high-quality aerodynamic and aeromechanic measurements. In this paper, a thorough numeric

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5

Paletta, N., J. Flüh, J. Lindemann, et al. "The preliminary design of a scaled Composite UHBR Fan for a wind tunnel test campaign." IOP Conference Series: Materials Science and Engineering 1226, no. 1 (2022): 012041. http://dx.doi.org/10.1088/1757-899x/1226/1/012041.

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Abstract The ambition of the CA3ViAR project is to design an open test case fan that experiences instability mechanisms, which are representative for ultra-high bypass ratio (UHBR) fans of civil aircrafts, and to perform a comprehensive experimental investigation to measure aerodynamic, aeroelastic and aeroacoustic performance in a wide range of operational conditions. Experimental tests will be performed in the Propulsion-Test-Facility (PTF) of the Institute of Jet Propulsion and Turbomachinery (IFAS) of Technische Universität Braunschweig, Germany. The final objective of the project is to pr

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6

Eggers, Torben, Jens Friedrichs, Jan Goessling, et al. "Effect of 3D blade design on the aerodynamic, aeroelastic and structural behavior of a scaled UHBR fan." Journal of Physics: Conference Series 2526, no. 1 (2023): 012032. http://dx.doi.org/10.1088/1742-6596/2526/1/012032.

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Abstract In this paper, the effect of a 3D blade design on the aerodynamic, aeroelastic and structural behavior of a scaled UHBR fan is investigated numerically. First, an initial sensitivity analysis for the geometrical design features sweep and lean as well as an adaption of the thickness position in the fan hub region is conducted. Positive sweep is found to benefit the total pressure ratio, while positive lean improves the polytropic efficiency of the fan stage. Moving the maximum thickness position upwards leads to decreased flow turning and total pressure ratio. The mode shape and by tha

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7

Goessling, Jan, and Joerg R. Seume. "High-speed Digital Image Correlation (DIC) for measuring deformation and vibration of fast rotating fan blades." Journal of Physics: Conference Series 2526, no. 1 (2023): 012075. http://dx.doi.org/10.1088/1742-6596/2526/1/012075.

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Abstract Due to ecological requirements, the bypass-ratio of future civil turbofan engines will be increased. This leads to ultra-high bypass ratio (UHBR) engines, which bring in new challenges concerning the blade material, structural integration, and aeroelastic behaviour of the fan. The ambition of the project Composite fan Aerodynamic, Aeroelastic, and Aeroacoustic Validation Rig (CA3ViAR) is to design and test an open-test-case fan that experiences instability mechanisms, which are representative for UHBR fans of civil aircrafts. The optical measurement technique Digital Image Correlation

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8

Mennicken, M., D. Schoenweitz, M. Schnoes, and R. Schnell. "Fan design assessment for BLI propulsion systems." CEAS Aeronautical Journal 13, no. 1 (2021): 3–19. http://dx.doi.org/10.1007/s13272-021-00532-8.

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AbstractCivil aviation is aiming at fuel efficient aircraft concepts. Propulsion systems using boundary layer ingestion (BLI) are promising to reach this goal. The focus of this study is on the DLR UHBR fan stage of a tube and wing aircraft with rear-integrated engines. In this integration scenario the propulsion system and especially the fan stage receives distorted inflow in steady-state flight conditions. The distortion pattern and distortion intensity are dependent on the operating conditions. Consequently, the interaction of the fan and the distortion changes over the flight envelope. The

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9

Mennicken, M., D. Schoenweitz, M. Schnoes, and R. Schnell. "Fan design assessment for BLI propulsion systems." CEAS Aeronautical Journal 13, no. 1 (2021): 3–19. http://dx.doi.org/10.1007/s13272-021-00532-8.

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AbstractCivil aviation is aiming at fuel efficient aircraft concepts. Propulsion systems using boundary layer ingestion (BLI) are promising to reach this goal. The focus of this study is on the DLR UHBR fan stage of a tube and wing aircraft with rear-integrated engines. In this integration scenario the propulsion system and especially the fan stage receives distorted inflow in steady-state flight conditions. The distortion pattern and distortion intensity are dependent on the operating conditions. Consequently, the interaction of the fan and the distortion changes over the flight envelope. The

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10

Stuermer, Arne. "DLR TAU-Code uRANS Turbofan Modeling for Aircraft Aerodynamics Investigations." Aerospace 6, no. 11 (2019): 121. http://dx.doi.org/10.3390/aerospace6110121.

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In the context of an increased focus on fuel efficiency and environmental impact, turbofan engine developments continue towards larger bypass ratio engine designs, with Ultra-High Bypass Ratio (UHBR) engines becoming a likely power plant option for future commercial transport aircraft. These engines promise low specific fuel consumption at the engine level, but the resulting size of the nacelle poses challenges in terms of the installation on the airframe. Thus, their integration on an aircraft requires careful consideration of complex engine–airframe interactions impacting performance, aeroel

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11

Schneider, Alexandra P., Benoit Paoletti, Xavier Ottavy, and Christoph Brandstetter. "Experimental monitoring of vibrations and the problem of amplitude quantification." Journal of Physics: Conference Series 2511, no. 1 (2023): 012017. http://dx.doi.org/10.1088/1742-6596/2511/1/012017.

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Abstract Experimental monitoring of blade vibration in turbomachinery is typically based on blade-mounted strain gauges. Their signals are used to derive vibration amplitudes which are compared to previously determined modal scope limits, including a safety factor. According to industrial guidelines, this factor is chosen conservatively to ensure safe operation of the machine. For the experimental campaign with the open test case fan ECL5, which is representative for modern lightweight UHBR architectures, it is planned to conduct measurements close to the stability limit. These investigations

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12

Eggers, Torben, Hye Rim Kim, Simon Bittner, Jens Friedrichs, and Joerg R. Seume. "Aerodynamic and Aeroelastic Effects of Design-Based Geometry Variations on a Low-Pressure Compressor." International Journal of Turbomachinery, Propulsion and Power 5, no. 4 (2020): 26. http://dx.doi.org/10.3390/ijtpp5040026.

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In modern aircraft engines, the low-pressure compressor (LPC) is subjected to a flow characterized by strong wakes and secondary flows from the upstream fan. This concerns ultra-high bypass ratio (UHBR) turbofan engines, in particular. This paper presents the aerodynamic and aeroelastic sensitivities of parametric variations on the LPC, driven by the design considerations in the upstream fan. The goal of this investigation was to determine the influence of design-based geometry parameter variations on the LPC performance under realistic inlet flow distributions and the presence of an s-duct. A

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13

Schneider, Alexandra P., Benoit Paoletti, Xavier Ottavy, and Christoph Brandstetter. "Quantification of Blade Vibration Amplitude in Turbomachinery." International Journal of Turbomachinery, Propulsion and Power 9, no. 1 (2024): 10. http://dx.doi.org/10.3390/ijtpp9010010.

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Experimental monitoring of blade vibration in turbomachinery is typically based on blade-mounted strain gauges. Their signals are used to derive vibration amplitudes which are compared to modal scope limits, including a safety factor. According to industrial guidelines, this factor is chosen conservatively to ensure safe operation of the machine. Within the experimental campaign with the open-test-case composite fan ECL5/CATANA, which is representative for modern lightweight Ultra High Bypass Ratio (UHBR) architectures, measurements close to the stability limit have been conducted. Investigati

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14

Xiang, Kangshen, Weijie Chen, Siddiqui Aneeb, and Weiyang Qiao. "A Rapid RI-TP Model for Predicting Turbine Wake Interaction Broadband Noise." Aerospace 11, no. 3 (2024): 210. http://dx.doi.org/10.3390/aerospace11030210.

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Future UHBR (Ultra-High Bypass-Ratio) engines might cause serious ‘turbine noise storms’ but, at present, turbine noise prediction capability is lacking. The large turning angle of the turbine blade is the first major factor deserving special attention. The RANS (Reynold Averaged Navier–Stokes equation)-informed (here called RI) method and LINSUB (the bound vorticity 2D model LINearized SUBsonic flow in cascade), developed to predict fan broadband noise, coupled with a two-flat-plates (here called TP) assumption for the turbine blade, is applied here, and one autonomous rapid RI-TP model for p

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15

Magrini, Andrea, and Ernesto Benini. "Aeropropulsive assessment of engine installation at cruise for UHBPR turbofan with body force fan modelling." Aerospace Science and Technology 132 (January 2023): 108048. http://dx.doi.org/10.1016/j.ast.2022.108048.

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Geimer, Peter. "Vorhang, Lampe, Sessel, Uhr." ZMK Zeitschrift für Medien- und Kulturforschung 2/1/2011: Offene Objekte 2, no. 1 (2011): 111–26. http://dx.doi.org/10.28937/1000107526.

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Das 1999 veröffentlichte Proust-Lexikon von Philippe Michel-Thiriet umfasst neben zahlreichen biographischen Daten ein »Lexikon der Personen in der Recherche« sowie ein »Lexikon der Orte der Recherche«. Es gibt jedoch kein Lexikon der Dinge der Recherche: kein Verzeichnis der Möbel im Salon von Madame Verdurin, keine Notiz zur »Feindseligkeit der violetten Vorhänge« im Hotel in Balbec, zum vergessenen Fächer der Königin von Neapel oder der Hängelampe im Esszimmer von Combray. Gehören diese Dinge demnach nicht dazu? Handelt es sich um Uneigentliches, um Beiwerk oder Requisiten? Oder sind diese

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17

Skauge, Tom. "Etikk, samfunnsansvar og bærekraft." Tidsskrift for Professionsstudier 17, no. 33 (2021): 40–51. http://dx.doi.org/10.7146/tfp.v17i33.129162.

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Har norsk økonomiutdanning fått et paradigmeskift med nye fag for etikk, samfunnsansvar og bærekraft? Faglig innovasjon for bærekraftsmål ved 15 institusjoner for økonomi og administrasjon i Norge kan tyde på det. Universitets- og høgskolerådets strategiske enhet for økonomi og administrasjon (UHR-ØA) i Norge gav i 2018 anbefaling om ny faglig satsing på etikk, samfunnsansvar og bærekraft. Det var første gang på lang tid at bachelorstudiets faglige søyler ble utvidet fra de fire disiplinene: Bedriftsøkonomi, samfunnsøkonomi, administrasjonsfag og metodefag. En ny faglig stolpe ble etablert: Et

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18

Dominy, J. "Cooling System Optimization in High-duty Aerospace Transmissions." Proceedings of the Institution of Mechanical Engineers, Part G: Journal of Aerospace Engineering 204, no. 1 (1990): 21–27. http://dx.doi.org/10.1243/pime_proc_1990_204_205_02.

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The long-term future of large aircraft engines is seen to lie in ‘ultra high bypass ratio’ (UHB) powerplant. One possibility for such engines is to use reduction gearboxes to allow the relatively high-speed turbine and the low-speed fan to run at their optimum efficiencies. An important constraint upon the application of these gearboxes is the weight and drag of the cooling system. This paper presents an analysis of cooler requirements for a transmission with its own integral oil system. Results are presented for a 4.5 MW gearbox typical of the more powerful turbo prop engines currently in civ

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19

Gilden, Julia K., Christopher Eggers, Yitong Li, et al. "Abstract 5486: Bioluminescent assays for antibody-drug conjugate development: internalization and Fc-mediated functions." Cancer Research 85, no. 8_Supplement_1 (2025): 5486. https://doi.org/10.1158/1538-7445.am2025-5486.

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Abstract Antibody-drug conjugates (ADCs) combine targeted delivery with potent cytotoxic payloads, utilizing multiple mechanisms of action (MoA). These include direct cytotoxicity following internalization of the ADC by antigen-expressing cells, killing of bystander cells through cleaved payloads, antigen function blockade, and immune-mediated cytotoxicity (e.g. Antibody-Dependent Cellular Cytotoxicity and Antibody-Dependent Cellular Phagocytosis) driven by the antibody Fc region. Comprehensive characterization and potency testing of ADCs require assays that capture each MoA. To address this n

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20

Lane, Andrew N., Timothy L. Scott, Juan Zhu, et al. "Abstract 2324: Small-scale microwave-assisted acid hydrolysis method for glycogen determination and turnover in tumors using Stable Isotope Resolved Metabolomics." Cancer Research 82, no. 12_Supplement (2022): 2324. http://dx.doi.org/10.1158/1538-7445.am2022-2324.

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Abstract Introduction: Glycogen is a readily deployed intracellular energy storage macromolecule composed of branched chains of glucose. Although glycogen primarily occurs in the liver and muscle, it can be found in most tissues throughout the body, and its metabolism has been shown to be important in cancers and immune cells. Robust analysis of glycogen turnover requires stable isotope tracing plus a reliable means of quantifying total and labeled glycogen derived from precursors such as 13C6-glucose. Current methods for analyzing glycogen are time- and sample-consuming, at best semi-quantita

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Мамедов, Шарафат Гаджиага оглы. "Исследование квазитройной системы FeS–Ga2S3–Ag2S по разрезу FeGa2S4–AgGaS2". Kondensirovannye sredy i mezhfaznye granitsy = Condensed Matter and Interphases 22, № 2 (2020): 232–37. http://dx.doi.org/10.17308/kcmf.2020.22/2835.

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Интерес к изучению систем, содержащих сульфиды формулой АIВIIIСVI2, обусловлен, прежде всего, открывающимися возможностями их практического использования в изготовлении нелинейных оптических приборов, детекторов, солнечных батарей, фотодиодов, люминофоров и др. Поэтому в связи с поиском новых перспективных материаловна основе тиогаллата серебра и железа целью этой работы является исследование квазибинарного разреза FeGa2S4–AgGaS2 четырехкомпонентной системы Fe–Ag–Ga–S.Синтез сплавов системы AgGaS2–FeGa2S4 проводили из лигатур с использованием высокой чистоты: железа – 99.995 %, галлия – 99.999

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22

Moreau, A., R. Schnell, and M. Mennicken. "Acoustic preliminary design of a low-noise fan stage considering a variable-area nozzle and variable-pitch rotor blades." CEAS Aeronautical Journal, April 13, 2023. http://dx.doi.org/10.1007/s13272-023-00658-x.

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AbstractA low-noise low-pressure ultra-high-bypass-ratio fan stage to be implemented in the next generation of aircraft engines is described and evaluated acoustically with semi-empirical and analytical methods suited for preliminary design. As expected, good reduction potentials are observed for the jet noise and fan tonal noise components when the UHBR design is compared to current fans in service. However, concerns are identified for fan broadband noise, which are attributed to the off-design operation of the UHBR fan too close from its stability limit. By unloading the fan and thus reducin

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23

Rodrigues, Martin, Laurent Soulat, Benoit Paoletti, Xavier Ottavy, and Christoph Brandstetter. "Aerodynamic Investigation of a Composite Low-Speed Fan for UHBR Application." Journal of Turbomachinery 143, no. 10 (2021). http://dx.doi.org/10.1115/1.4050671.

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Abstract A composite fan stage representative of a modern Ultra High Bypass Ratio (UHBR) architecture has been investigated experimentally on a novel test facility at Ecole Centrale de Lyon. These measurements show indications for strong overloading of the tip region resulting in extensive blockage of the blade passage. The performance of the fan is analyzed with extensive instrumentation including radial profiles upstream and downstream of the rotor. Unsteady pressure measurements help to interpret the flow structure in the tip region. The results are presented across a range of operating poi

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Brandstetter, Christoph, Alexandra Schneider, Anne Lise Fiquet, Benoit Paoletti, and Xavier Ottavy. "Experiments on Structurally Mistuned UHBR Open-Test-Case Fan ECL5/CATANA." Journal of Engineering for Gas Turbines and Power, November 22, 2024, 1–16. http://dx.doi.org/10.1115/1.4067221.

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Abstract The operational capabilities of turbofan engines encounter limitations due to instabilities arising from tightly coupled interactions among aerodynamics, acoustics, and structural mechanics. Modern fans and compressors exhibit Non-Synchronous Vibration (NSV), leading to safety-critical blade oscillations. In contrast to self-excited phenomena such as flutter, NSV stems from the convection of aerodynamic disturbances that synchronize with blade eigenmodes. Recent experiments, conducted as part of the European CATANA project on a structurally tuned reference configuration, revealed high

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25

Daroukh, Majd, Stéphane Moreau, Nicolas Gourdain, Jean-François Boussuge, and Claude Sensiau. "Tonal Noise Prediction of a Modern Turbofan Engine With Large Upstream and Downstream Distortion." Journal of Turbomachinery 141, no. 2 (2019). http://dx.doi.org/10.1115/1.4042163.

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Ultra-high bypass ratio (UHBR) engines are designed as compact as possible and are characterized by a short asymmetric air inlet and heterogeneous outlet guide vanes (OGVs). The flow close to the fan is therefore circumferentially nonuniform (or distorted) and the resulting noise might be impacted. This is studied here at take-off conditions by means of a simulation of the unsteady Reynolds-averaged Navier–Stokes (URANS) equations of a full-annulus fan stage. The model includes an asymmetric air inlet, a fan, heterogeneous OGVs, and homogeneous inlet guide vanes (IGVs). Direct acoustic predict

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26

Schneider, Alexandra, Anne Lise Fiquet, Benoit Paoletti, Xavier Ottavy, and Christoph Brandstetter. "EXPERIMENTS ON TUNED UHBR OPEN-TEST-CASE FAN ECL5/CATANA: PERFORMANCE AND AERODYNAMICS." Journal of Turbomachinery, December 7, 2023, 1–14. http://dx.doi.org/10.1115/1.4064231.

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Abstract With the advancement of modern fan architectures the lack of experimental benchmarks for the research community became apparent in recent years. Enormous effort in method development could not be validated on representative geometries and motivated the development of the open-test-case ECL5/CATANA. A carbon fibre fan stage has been designed by Ecole Centrale de Lyon and shared with the community in 2021. The fan is representative of modern UHBR architectures with sonic design speed. The reference configuration has been investigated experimentally with multi-physical instrumentation. I

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Fiquet, Anne Lise, Alexandra Schneider, Benoit Paoletti, Xavier Ottavy, and Christoph Brandstetter. "Experiments On Tuned UHBR Open-Test-Case Fan ECL5/CATANA: Stability Limit." Journal of Engineering for Gas Turbines and Power, October 11, 2023, 1–12. http://dx.doi.org/10.1115/1.4063717.

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Abstract Research of the past decades has shown that the operating range of modern fans and compressors is often limited by aeroelastic phenomena before the onset of pure aerodynamic instability. Prediction of these mechanisms is challenging for state-of-the-art numerical methods, particularly for configurations with flexible wide-chord blades. To provide a benchmark configuration for the community, the composite-material fan stage ECL5, representative of near future Ultra-High-Bypass Ratio architectures, has been designed at Ecole Centrale de Lyon and recently shared as an open-test-case. In

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Fiquet, Anne Lise, Xavier Ottavy, and Christoph Brandstetter. "UHBR OPEN-TEST CASE FAN ECL5/CATANA: Non-linear analysis of Non-Synchronous Blade Vibration at part-speed conditions." Journal of Turbomachinery, February 23, 2024, 1–24. http://dx.doi.org/10.1115/1.4064841.

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Abstract The onset of non-synchronous-vibrations have been predicted for a composite open-test-case UHBR fan geometry by time-linearized simulations at part-speed conditions. In the current study, time-accurate simulations with harmonic blade oscillations have been conducted to investigate the non-linear behaviour. Results for different operating conditions show the evolution of aeroelastic stability. The lock-in of convected aerodynamic disturbances with structural vibration is analysed for different vibration amplitudes and frequencies. The simulations show the development of multiple wave-n

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Brandstetter, Christoph, Valdo Pages, Pierre Duquesne, Benoit Paoletti, Stéphane Aubert, and Xavier Ottavy. "Project PHARE-2—A High-Speed UHBR Fan Test Facility for a New Open-Test Case." Journal of Turbomachinery 141, no. 10 (2019). http://dx.doi.org/10.1115/1.4043883.

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Abstract A novel test facility for transonic fans has been constructed and commissioned at École Centrale de Lyon (ECL) within the Project PHARE-2. The facility is instrumented with multi-physical measurement systems to deeply investigate aeroelastic and aeroacoustic phenomena. To enable long-term fundamental research, the composite material open-test-case rotor ECL5 is currently under development, which shall be established as a new reference case for method development. Within the present publication, the project objectives, the current rotor design, ECL5v2, and details on the test facility

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Flament, Theo, Jean-François Deü, Antoine Placzek, Mikel Balmaseda Aguirre, and Duc-Minh Tran. "Reduced Order Model of Nonlinear Structures for Turbomachinery Aeroelasticity." Journal of Engineering for Gas Turbines and Power, September 29, 2023, 1–12. http://dx.doi.org/10.1115/1.4063544.

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Abstract This work concerns the numerical modeling of geometric nonlinear vibrations of slender structures in rotation using an original reduced order model based on the use of dual modes along with the implicit condensation method. This approach is an improvement of the classical ICE method in the sense that the membrane stretching effect is taken into account in the dynamic resolution. The dynamics equations are firstly presented and the construction of the reduced order model (ROM) is then proposed. The second part of the paper deals with numerical applications using the finite element meth

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De Cristofaro, Maria Teresa R., Flavia Linguanti, Miriam Pepponi, et al. "Reduction in variability of dopamine transporter measures using SPECT and ultra-high-resolution fan beam collimators: comparison with parallel-hole collimators in healthy controls for a clinical reference database." Clinical and Translational Imaging, February 24, 2024. http://dx.doi.org/10.1007/s40336-023-00613-0.

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Abstract Purpose The purpose of this study was to create 123I-FP-CIT reference values for ultra-high-resolution fan beam collimators (UHR-FB) from a sample of subjects without dopaminergic degeneration and to compare them to a normal database -PPMI database- of a commercial software (DaTQUANT) obtained using high-resolution parallel-hole collimators (HR-PH). Methods A striatal phantom study was performed to compare UHR-FB with HR-PH and to obtain a correction factor between collimators. Normal 123I-FP-CIT studies from 177 subjects acquired using UHR-FB were retrospectively selected on the basi

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Huflage, Henner, Robin Hendel, Andreas Steven Kunz, et al. "Investigating the Small Pixel Effect in Ultra-High Resolution Photon-Counting CT of the Lung." Investigative Radiology, August 9, 2023. http://dx.doi.org/10.1097/rli.0000000000001013.

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Objectives The aim of this study was to investigate potential benefits of ultra-high resolution (UHR) over standard resolution scan mode in ultra-low dose photon-counting detector CT (PCD-CT) of the lung. Materials and Methods Six cadaveric specimens were examined with 5 dose settings using tin prefiltration, each in UHR (120 × 0.2 mm) and standard mode (144 × 0.4 mm), on a first-generation PCD-CT scanner. Image quality was evaluated quantitatively by noise comparisons in the trachea and both main bronchi. In addition, 16 readers (14 radiologists and 2 internal medicine physicians) independent

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Adrien, Vladimir, Justine Liewig, Thomas Diot, et al. "Association between family functioning and psychotic transition in ultra-high risk adolescents and young adults." Frontiers in Psychiatry 14 (June 21, 2023). http://dx.doi.org/10.3389/fpsyt.2023.1177311.

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BackgroundPsychotic transition (PT) is a crucial stage in schizophrenia. The Comprehensive Assessment of At-Risk Mental States (CAARMS) scale can be used to identify individuals at ultra-high risk (UHR) for psychosis and to evaluate their risk of PT. Many environmental and genetic factors have been identified as contributing to the development and decompensation of schizophrenia. This study aimed to determine if the quality of family functioning is associated with PT risk in UHR individuals aged between 11 and 25 years after 1 year of follow-up.MethodsFrom January to November 2017, 45 patients

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Sánchez-Moreno, Francisco, David MacManus, Fernando Tejero, Josep Hueso-Rebassa, and Christopher Sheaf. "Installed nacelle aerodynamics at cruise and windmilling conditions." Aircraft Engineering and Aerospace Technology, July 11, 2024. http://dx.doi.org/10.1108/aeat-03-2023-0070.

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Purpose The decrease in specific thrust achieved by Ultra-High Bypass Ratio (UHBPR) aero-engines allows for a reduction in specific fuel consumption. However, the typical associated larger fan size might increase the nacelle drag, weight and the detrimental interference effects with the airframe. Consequently, the benefits from the new UHBPR aero-engine cycle may be eroded. This paper aims to evaluate the potential improvement in the aerodynamic performance of compact nacelles for installed aero-engine configuration. Design/methodology/approach Drooped and scarfed non-axisymmetric compact and

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Borgen, Cathrine. "Etikk og bærekraft – hva skal studentene lære?" Magma 24, no. 4 (2023). http://dx.doi.org/10.23865/magma.v24.1341.

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Det har skjedd en revolusjon innen bachelorutdanningene i økonomi og administrasjon (BØA) hva angår tematikken etikk, samfunnsansvar og bærekraft (ESAB), som i løpet av få år har fått mye oppmerksomhet og større plass i utdanningen. ESAB er nå løftet fram som eget fagområde på lik linje med bedriftsøkonomiske, administrative, samfunnsøkonomiske og metoderelaterte fag. Universitets- og høgskolerådets strategiske enhet for utdanning i økonomi og administrasjon (UHR-ØA) presenterte i 2018 nye minimumskrav til BØA-utdanningen. I denne artikkelen gjennomgås læringsutbyttebeskrivelsene i institusjon

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Popov, Pavel A., Sergey V. Kuznetsov, Alexander A. Krugovykh, Nikolay V. Mitroshenkov, Stanislav S. Balabanov та Pavel P. Fedorov. "Исследование теплопроводности PbS, CuFeS2, ZnS". Kondensirovannye sredy i mezhfaznye granitsy = Condensed Matter and Interphases 22, № 1 (2020). http://dx.doi.org/10.17308/kcmf.2020.22/2533.

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Знание величины коэффициента теплопроводности полупроводникового материала необходимо для оценки возможности использования его в качестве термоэлектрика. Абсолютным стационарным методом продольного теплового потока в интервале 50–300 K исследована теплопроводность природных минералов галенита (PbS), халькопирита (CuFeS2), а также керамики ZnS.Образцы были однородными, имели малое содержание примесей (химический состав образцов контролировался ренгенофлюоресцентным методом) и характеризовались высокими значениями удельного электрического сопротивления (r > 9·10–2 Ом·м при комнатной температу

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