Littérature scientifique sur le sujet « WH 265 »
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Articles de revues sur le sujet "WH 265"
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Chatterley, Christie, et Karl Linden. « Demonstration and evaluation of germicidal UV-LEDs for point-of-use water disinfection ». Journal of Water and Health 8, no 3 (9 mars 2010) : 479–86. http://dx.doi.org/10.2166/wh.2010.124.
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Ultraviolet (UV) irradiation is a common disinfection option for water treatment in the developed world. There are a few systems installed in developing countries for point-of-use treatment, but the low-pressure mercury lamps currently used as the UV irradiation source have a number of sustainability issues including a fragile envelope, a lifetime of approximately one year, and they contain mercury. UV light emitting diodes (LEDs) may offer solutions to many of the sustainability issues presented by current UV systems. LEDs are small, efficient, have long lifetimes, and do not contain mercury. Germicidal UV LEDs emitting at 265 nm were evaluated for inactivation of E. coli in water and compared to conventional low-pressure UV lamps. Both systems provided an equivalent level of treatment. A UV-LED prototype was developed and evaluated as a proof-of-concept of this technology for a point-of-use disinfection option, and the economics of UV-LEDs were evaluated.
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Shi, Changmin, Saya Takeuchi, Joseph Dura et Eric Wachsman. « (Digital Presentation) High Energy Density Stable Lithium-Sulfur Batteries Enabled By 3D Bilayer Garnet Electrolytes ». ECS Meeting Abstracts MA2022-02, no 7 (9 octobre 2022) : 2614. http://dx.doi.org/10.1149/ma2022-0272614mtgabs.
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The cubic-garnet (Li7La3Zr2O12, LLZO) Lithium-Sulfur battery (GLSB) shows great promise in the pursuit of achieving high energy densities. The sulfur used in the cathodes are abundant and inexpensive and possess high specific capacity. As well, LLZO displays excellent chemical stability with Li metal. By using unique porous/dense/porous LLZO “trilayer” and dense/porous LLZO “bilayer” architectures developed by our group, an exceptionally high areal current density of 10 mA/cm2 in Li-Li symmetric cells without applied pressure was achieved. However, instability in the sulfur cathode/LLZO interface can cause cell performance issues. Therefore, it is critical to resolve the sulfur cathode/LLZO interfacial challenge to achieve stable cycling. Here, we created an innovative gel polymer (GPE) buffer layer to stabilize the sulfur cathode/LLZO interface. With a thin bilayer LLZO architecture as a solid electrolyte, stable cycling was achieved with a high initial discharge capacity of 1542 mAh/g corresponding to an energy density of 223 Wh/kg and 769 Wh/L under a discharge current density of 0.87 mA/cm2 without applied pressure. Moreover, the addition of the GPE interlayer also allowed the GLSB cells to maintain an average discharge capacity of 1218 mAh/g over 265 cycles with 80% capacity retention at discharge current density of 1.74 mA/cm2 under a sulfur loading of 5.2 mg/cm2 at 22 (Figure 1). Achieving such stability is a major step in the development of commercial garnet lithium sulfur batteries. Figure 1
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Taer, E., A. Apriwandi, Z. Purba et R. Taslim. « Porous carbon nanofiber monolith binder-free derived from stink bean pod peel as electrode material for symmetric supercapacitor application ». Journal of Ovonic Research 17, no 5 (septembre 2021) : 487–97. http://dx.doi.org/10.15251/jor.2021.175.487.
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Activated carbon bio-wastes-based have been extensively studied as electrode material for symmetric supercapacitor. In this work, the activated carbon stink bean pod peel-based was synthesis with simplest possible technique without involving complicated techniques as electrode material for supercapacitor. Stinky bean pod peel-based activated carbon is prepared through pre-carbonization, chemical activation, carbonization, and physical activation. ZnCl2 in four different concentrations of 0.1, 0.3, and 0.5 m L-1 was selected as chemical reagent. Furthermore, the carbonization and physical activated were performed in furnace tube in high temperature. The physical features obtained indicate the potential of stink bean pod peel as activated carbon with a nanofiber structure and decorated by rodlike structure. In symmetric supercapacitor, the capacitive behavior was obtained as high as 265 F g-1 in 1 M H2SO4 aqueous electrolyte. In addition, the maximum energy density was found of 36.18 Wh kg-1 with power density of 125.06 W kg-1 . This simple method of obtaining activated carbon from stink bean pod peel provides a perspective for the further development of high-performance electrode materials for supercapacitor applications.
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Wang, Chao-Yang, Teng Liu, Xiao-Guang Yang, Shanhai Ge, Nathaniel V. Stanley, Eric S. Rountree, Yongjun Leng et Brian D. McCarthy. « (Keynote) Rapid Thermal Management for Fast Charging of Energy-Dense Lithium-Ion Batteries ». ECS Meeting Abstracts MA2023-02, no 7 (22 décembre 2023) : 954. http://dx.doi.org/10.1149/ma2023-027954mtgabs.
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Charging time trauma refers to the pain experienced by electric vehicle (EV) owners when the ‘refill’ time is significantly longer than that of traditional internal combustion engine vehicles. Worsening this trauma is the inconsistency of EV charging; for example, the same EV may take five times longer to charge on a cold day. Faster charging will alleviate this pain point and aid in the mass adoption of EVs, crucial for meeting near-term carbon emission goals. Reaching this goal will require smarter and more rapid thermal management to provide significantly faster safe charging. The results from the 2022 Nature article “Fast charging of energy-dense lithium-ion batteries” (DOI 10.1038/s41586-022-05281-0) where 265 Wh/kg lithium-ion pouch cells were charged from 0-70% in less than 12 minutes, 2,000 times in a row before end-of-life, will be presented. These cells used only proven materials, including a liquid electrolyte made from industrially-used components, and energy-dense, EV-grade electrodes. Key to success was smart cell thermal management. More recent advancements, including multi-cell battery-level data, will also be discussed. Figure 1
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Cascino, Gregory. « Functional MRI for Language Localization ». Epilepsy Currents 2, no 6 (novembre 2002) : 178–79. http://dx.doi.org/10.1111/j.1535-7597.2002.00065.x.
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Language Dominance in Partial Epilepsy Patients Identified with an fMRI Reading Task Gaillard WD, Balsamo L, Xu B, Grandin CB, Braniecki SH, Papero PH, Weinstein S, Conry J, Pearl PL, Sachs B, Sato S, Jabbari B, Vezina LG, Frattali C, Theodore WH Neurology 2002;59(2):256–265 Background Functional magnetic resonance imaging (fMRI) language tasks readily identify frontal language areas; temporal activation has been less consistent. No studies have compared clinical visual judgment with quantitative region-of-interest (ROI) analysis. Objective To identify temporal language areas in patients with partial epilepsy by using a reading paradigm with clinical and ROI interpretation. Methods Thirty patients with temporal lobe epilepsy, aged 8 to 56 years, had 1.5-T fMRI. Patients silently named an object described by a sentence compared with a visual control. Data were analyzed with ROI analysis from t-maps. Regional asymmetry indices (AIs) were calculated ([L-R]/[L+R]), and language dominance defined as >0.20. t-Maps were visually rated by three readers at three t thresholds. Twenty-one patients had the intracarotid amobarbital test (IAT). Results The fMRI reading task provided evidence of language lateralization in 27 of 30 patients with ROI analysis. Twenty-five were left dominant, two right, one bilateral, and two were nondiagnostic; IAT and fMRI agreed in most patients; three had partial agreement, and none overtly disagreed. Interrater agreement ranged between 0.77 to 0.82 (Cramer V; p < 0.0001); agreement between visual and ROI reading with IAT was 0.71 to 0.77 (Cramer V; p < 0.0001). Viewing data at lower thresholds added interpretation to 12 patients on visual analysis and eight with ROI analysis. Conclusions An fMRI reading paradigm can identify language dominance in frontal and temporal areas. Clinical visual interpretation is comparable to quantitative ROI analysis.
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Nikman, Shahin, Abdulhakim Oudjana, Thomas Leckie, Pasidu Pallawela et Edward Brightman. « Hybrid Lithium Polysulfide Flow Batteries for Large Scale Energy Storage ». ECS Meeting Abstracts MA2022-02, no 2 (9 octobre 2022) : 139. http://dx.doi.org/10.1149/ma2022-022139mtgabs.
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Lithium-sulfur battery chemistry has garnered global attention as a promising next-generation energy storage technology due to its significantly higher theoretical capacity (450 Wh/kg) compared to lithium-ion (265 Wh/kg), and the fact that its elemental components are green, safe and abundant[1]. As opposed to lithium-ion, the cathode solution chemistry is rich, as elemental sulfur forms polysulfide chains during discharge which can transport and deposit on the metallic lithium anode during a dissolution-migration-deposition “shuttle” mechanism which in effect a) cause a constant internal shorting current proportional to the transport of polysulfides and b) cause a build-up of lithium- and sulfur-rich solid-electrolyte interphase (SEI) on the anode which irreversibly passivates the lithium metal anode. This effect must be supressed at all costs in conventional lithium-sulfur batteries, and is achieved by encouraging rapid precipitation of Li2S salts by the use of low-donor number solvents for the electrolyte such as diglyme (DME) and dioxolane (DOL). However, polysulfide chains (Li2Sx, 3 ≤ x ≤ 8) have great potential as redox couples due to their stable, successive multistep redox behaviour and have been successfully demonstrated in hybrid redox-flow battery configurations[2], in particular enabled by lithium nitrate as an additive to the catholyte that forms a stable SEI on the lithium metal surface that greatly reduces the polysulfide deposition. The lithium-polysulfide redox flow battery in theory far outstrips current state of the art vanadium redox flow batteries due to the higher capacity density in the catholyte (50-150 Wh/L vs 30 Wh/L), and the energy dense lithium metal[2]. However, the solubility of polysulfides decrease with chain length and depth of discharge, and high polarity, high donor number solvents that can enable high polysulfide concentrations[3] are typically far more reactive towards lithium metal[4]. Moreover lithium nitrate have little effect as anode protectant in this class of solvents compared to low donor number, low polarity solvents such as DME and DOL, and the polysulfide reduction pathway is dependent on the stabilising property of the solvent[5]. In collaboration with our commercial partner StorTera under the Faraday Institute, we have developed novel techniques for catholyte analysis. We show the role of nitrate consumption rate on protection of the anode, and the relative corrosive rate of lithium in a high polarity, high donor number class solvent (DMSO) versus conventional low polarity, low donor number class solvent (DOL/DME). Further we explore avenues to protect metallic lithium in highly concentrated polysulfide catholyte that enables large-scale energy storage that surpasses lithium-ion and vanadium redox flow batteries for cost, safety, serviceability and environmental impact. Such factors will be key for commercial deployment, in particular suitable for developing countries where microgrids for remote communities rely on intermittent renewable power supply. Zhang, G., Zhang, Z. W., Peng, H. J., Huang, J. Q. & Zhang, Q. A Toolbox for Lithium–Sulfur Battery Research: Methods and Protocols. Small Methods 1, 1–32 (2017). Yang, Y., Zheng, G. & Cui, Y. A membrane-free lithium/polysulfide semi-liquid battery for large-scale energy storage. Energy Environ. Sci. 6, 1552–1558 (2013). Pan, H. et al. On the Way Toward Understanding Solution Chemistry of Lithium Polysulfides for High Energy Li-S Redox Flow Batteries. Adv. Energy Mater. 5, (2015). Gupta, A., Bhargav, A. & Manthiram, A. Highly Solvating Electrolytes for Lithium–Sulfur Batteries. Adv. Energy Mater. 9, 1–9 (2019). Lu, Y. C., He, Q. & Gasteiger, H. A. Probing the lithium-sulfur redox reactions: A rotating-ring disk electrode study. J. Phys. Chem. C 118, 5733–5741 (2014).
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Nguyen, Trung Van, et Yuanchao Li. « New Developments in the High-Energy-Density Solid-Liquid Storage Technology for Redox Flow Batteries ». ECS Meeting Abstracts MA2022-02, no 1 (9 octobre 2022) : 43. http://dx.doi.org/10.1149/ma2022-02143mtgabs.
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The environmental impact of the use of fossil fuels for energy can be reduced if electricity, which represents one-third of all energy uses, can be generated totally from renewable/sustainable sources such as wind and solar. However, this is only possible if cost-effective long-duration storage technologies are available to allow the highly variable and unpredictable wind and solar energy sources to become reliable baseline energy sources like coal, nuclear or natural gases. Redox flow battery (RFB) energy storage systems are highly suitable for this large-scale, long-duration storage application because while their power output scales with the size of the battery, their energy content resides in the amount of active materials that are stored in external tanks and can be easily scaled up for longer duration.1 The conventional redox flow batteries store electrical energy in the form of some aqueous or non-aqueous soluble ions or compounds in the electrolyte solution. Because of the low solubility (< 2M) of most ions and compounds in aqueous and non-aqueous solvents, these redox flow battery systems have low energy density.2–4 For example, the commercialized all-vanadium RFB system has an average energy density of 20 Wh/kg while that of the lithium-ion battery system is 100-265 Wh/kg.5 To store enough energy for 3-5 days in these RFBs requires a very large volume of solution in a large number of tanks, making these RFB systems expensive due to the cost of tanks and the fluid distribution system and floor space. Our group recently developed a new storage approach that can greatly increase the energy storage density while still enabling the flow battery concept.6 In this approach, the reactants are stored as both soluble ions and their undissolved solid forms and only the liquid containing the soluble ions is circulated through the batteries. This approach potentially enables >4X increase in the storage energy density. This technology was recently demonstrated in a hydrogen-vanadium (VI/V) system, and new test results and findings in this area will be presented in this talk. References H. Zhang, W. Lu, and X. Li, Electrochemical Energy Reviews, 1–15 (2019). D. G. Kwabi et al., Joule, 2, 1894–1906 (2018). M. Wu, T. Zhao, H. Jiang, Y. Zeng, and Y. Ren, Journal of Power Sources, 355, 62–68 (2017). C. Ding, H. Zhang, X. Li, T. Liu, and F. Xing, The Journal of Physical Chemistry Letters, 4, 1281–1294 (2013). A. Manthiram, ACS Central Science, 3, 1063–1069 (2017). Y. Li and T.V. Nguyen, “A Solid-Liquid High-Energy-Density Storage Concept for Redox Flow Batteries and Its Demonstration in an H2-V System,” Paper ID APEN-MIT-2021_023, Applied Energy Symposium: MIT A+B, Aug. 11-13, 2021, Cambridge, MA, USA.
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Sheikh, Sameena, R. K. Behl, S. S. Dhanda et Ashwani Kumar. « Gene effects for different metric traits under normal and high temperature stress environments in wheat (T. aestivum L. Em Thell) ». South Pacific Journal of Natural and Applied Sciences 27, no 1 (2009) : 38. http://dx.doi.org/10.1071/sp09007.
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The present investigation was conducted to analyze gene effects for grain yield and its components under two different environments. Nine wheat genotypes were selected to generate the experimental material comprised six parental and segregating generations (P1, P2, F1, F2, BC1 and BS1 of BC1 of each of the following six crosses – PBW 343 x WH 283, PBW 343 x WH 542, PBW 343 x PBW 435, UP 2565 x UP 2425, EIGN 1 x Raj 3765 and EIGN 8 x UP 2425. Joint scaling tests revealed the presence of epitasis. Six parameter model revealed the significance of additive gene effects (d) for biological and grain yield and their components in most of the crosses. The relative magnitude of (h) was higher than (d) in all the crosses for most of the characters while additive x additive (i) effects appeared to be significant for grain yield per plant (E1) and number of grain per spike (E2) in PBW 343 x WH 283. Significant (i) type of interaction was recorded in PBW 343 x WH 542 for number of grain per spike (E1), number of tillers per plant (E2) in PBW 343 x PBW 435 and for 1000-grain weight in UP 2565 x UP 2425. Pedigree method and simple selection in crosses like PBW 343 x PBW 435, UP 2565 x UP 2425, PBW 343 x WH 283 and PBW 343 x WH 542 should be used for improvement of traits governed by additive and additive x additive gene effect.
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Rasyida, Amaliya, Salsa Zulfa Aurelia, Fikriyah L. A. Intan, Nabila Firdausi Nuzula, Hosta Ardhyananta, Sigit Tri Wicaksono et Mas Irfan Purbawanto Hidayat. « Potential Use of Water Hyacinth (<i>Eichhornia crassipes</i>) as Growth Media : The Comparison of Acid and Base Treatment ». Materials Science Forum 1104 (10 novembre 2023) : 3–8. http://dx.doi.org/10.4028/p-do5gjx.
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This study aims to investigate the feasibility of using water hyacinth (WH) as growth media. It was carried out using different treatments, acid, and base, characterized by microscope optic, swelling index, soil water retention, and observing the growth of mung bean seeds for seven days. The results showed that the highest swelling index was NaOH solution treatment in WH with a 2.5 – 2 cm diameter at 560%. It was also shown that soil samples using WH with NaOH treatment can retain water, enhancing mung bean seeds’ rapid growth. Therefore, this preliminary study shows the potential use of WH as growth media.
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Phan, Trang, et Giang Vu. « Wh-questions in Japanese : Challenges for Vietnamese L2 learners ». Acta Linguistica Asiatica 14, no 1 (30 janvier 2024) : 87–109. http://dx.doi.org/10.4312/ala.14.1.87-109.
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The study explored how Vietnamese learners of Japanese handle structural differences in wh-questions. Despite both being wh-in-situ languages, the divergent word order poses challenges for Vietnamese learners. The research involved 65 high school students with 2.5 to 13 years of Japanese learning. Survey results showed a positive correlation between Japanese proficiency and performance. Students were more accurate when Japanese wh-questions mirrored Vietnamese word order, especially in ‘why’ and ‘when’ questions. Difficulties arose when structures differed. Advanced learners could acquire L2 wh-questions with parametric values distinct from L1, but native-like interpretations in Japanese remained challenging. The study advocates for explicit classroom instruction on Japanese wh-question word order, particularly with scrambled sentences, to enhance accuracy and improve overall teaching effectiveness.
Thèses sur le sujet "WH 265"
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Roussel, Xavier. « Oncogénèse des proliférations de cellules dendritiques plasmocytoïdes associées aux leucémies aiguës myéloïdes et études des interactions au sein du microenvironnement leucémique ». Electronic Thesis or Diss., Bourgogne Franche-Comté, 2024. http://indexation.univ-fcomte.fr/nuxeo/nxpath/default/default-domain/sections/confidentiel/these-a-roussel-xavier@view_documents?tabId=&conversationId=0NXMAIN1.
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Les proliférations à cellules dendritiques plasmocytoïdes (pDC) matures associées aux leucémies aiguës myéloïdes (LAM-pDC) sont une entité nouvellement décrite dans la classification de l’Organisation Mondiale de la Santé de 2022. L’origine et la fonction de ces pDC sont peu connues, avec une seule étude suggérant un pronostic péjoratif. Ce travail propose une description complète de l’entité LAM-pDC. Le premier axe comporte une caractérisation de la cellule d’origine leucémique de la prolifération des pDC dans les LAM-pDC permettant d’obtenir son profil transcriptionnel, épigénétique, phénotypique, et fonctionnel. Le second axe comporte une exploration de l’impact des mutations de RUNX1 dans l’oncogenèse des LAM-pDC qui présentent une mutation de RUNX1 dans 70% des cas. L’apport de technologie CRISPR/Cas9 a permis de générer un modèle de RUNX1 knock out, et un modèle RUNX1 Knock out / eGFP knock in sur lignées LAM. La comparaison avec la cellule souche leucémique des LAM-pDC a permis d’identifier les voies en lien avec les mutations de RUNX1 et celles nécessaires pour l’obtention d’un modèle de LAM-pDC. Enfin le troisième axe constitue une exploration complète des interactions entres les cellules immunitaires du microenvironnement leucémique des LAM-pDC. Cette étude a mis en évidence une multitude de signaux échangés entres les cellules du microenvironnement avec pour aboutissement un épuisement lymphocytaire et l’expression de gènes impliqués dans la fonction tolérogène du système immunitaire. En perspective, nous proposons un ensemble d’hypothèses permettant d’améliorer les connaissances sur l’oncogenèse des LAM-pDC, pouvant impliquer d’autres hémopathies telles que les leucémies aiguës lymphoblastiques, mais des mécanismes altérant la survie dans les LAM-pDC, et de potentielles pistes de traitements spécifiques à cette entité péjorativeMature plasmacytoid dendritic cells (pDC) proliferation associated with acute myeloid leukemia (pDC-AML) are a new describe entity by the world health organization Classification in 2022. Origin and function of pDC are little known, with only one study suggesting a worst prognosis. This work proposes a comprehensive description of pDC-AML. The first axis include a characterization of the leukemic cell-of-origin of pDC proliferation in pDC-AML, permitting to obtain its transcriptomic, epigenetic, phenotypic, and functional profile. The second axis include an investigation of the impact of RUXN1 mutations in pDC-AML oncogenesis, which are RUNX1 mutated in 70% of cases. The contribution of the CRISPR/Cas9 technology have permitted to obtain a RUNX1 knock out, and a RUNX1 Knock out / eGFP knock AML cell lines. The comparison with the pDC-AML leukemic stem cell have permitted to identify pathways related to RUNX1 mutations and other pathways required to obtain pDC-AML model. Finally, the third axis constitute a comprehension study about immune cells interaction in the pDC-AML leukemic microenvironment. This study highlights many cross talks between immune cells leading to lymphocyte exhaustion, and an upregulation of genes involved in the tolerogenic function of the immune system. In perspective, we propose several hypothesis increasing knowledge about pDC-AML oncogenesis, which can involve other entities such as acute lymphoblastic leukemia, but also provide mechanisms impairing survival in pDC-AML, and new insight for novel strategy of treatment specific to this poor-prognosis entity
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Vites, Olga. « Studien zu den biochemischen und strukturellen Eigenschaften von Snapin und zu seiner Rolle in der neuronalen Exozytose ». Doctoral thesis, 2004. http://hdl.handle.net/11858/00-1735-0000-0006-AC34-F.
Texte intégralChapitres de livres sur le sujet "WH 265"
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« More on Trevisan wh-in situ ». Dans Linguistik Aktuell/Linguistics Today, 131–62. Amsterdam : John Benjamins Publishing Company, 2021. https://doi.org/10.1075/la.266.c4.
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« Wh-in situ in Northern Italian dialects ». Dans Linguistik Aktuell/Linguistics Today, 23–53. Amsterdam : John Benjamins Publishing Company, 2021. https://doi.org/10.1075/la.266.c1.
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« On short movement of clause-internal wh-elements ». Dans Linguistik Aktuell/Linguistics Today, 55–90. Amsterdam : John Benjamins Publishing Company, 2021. https://doi.org/10.1075/la.266.c2.
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« Wh-to-Foc is focus-driven ». Dans Linguistik Aktuell/Linguistics Today, 91–129. Amsterdam : John Benjamins Publishing Company, 2021. https://doi.org/10.1075/la.266.c3.
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« On the theory of Romance wh-in situ ». Dans Linguistik Aktuell/Linguistics Today, 163–219. Amsterdam : John Benjamins Publishing Company, 2021. https://doi.org/10.1075/la.266.c5.
Texte intégralActes de conférences sur le sujet "WH 265"
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Kefauver, Kevin R., Gregory C. Walsh, Louis P. Hromada, James A. Kirk et Ronald B. Zmood. « A 50 Wh Open Core High-Speed Flywheel ». Dans 34th Intersociety Energy Conversion Engineering Conference. 400 Commonwealth Drive, Warrendale, PA, United States : SAE International, 1999. http://dx.doi.org/10.4271/1999-01-2615.
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Watson, Andrew B. « Model for optimizing DCT-based image compression ». Dans OSA Annual Meeting. Washington, D.C. : Optica Publishing Group, 1993. http://dx.doi.org/10.1364/oam.1993.wh.6.
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Knyazev, Mikhail. « An experimental study of argument extraction from presuppositional clauses in Russian ». Dans INTERNATIONAL CONFERENCE on Computational Linguistics and Intellectual Technologies. RSUH, 2023. http://dx.doi.org/10.28995/2075-7182-2023-22-245-253.
Texte intégralRésumé :
The paper discusses two acceptability rating studies testing wh-interrogative and relative extractions of arguments from ˇcto-clauses of presuppositional predicates like žalet’ ‘regret’, as contrasted with nonpresuppositional predicates like nadejat’sja ‘hope’ and nominalized (to ˇcto) clauses. The results show a difference in extraction between bare and nominalized clauses but no difference between presuppositional and nonpresuppositional clauses, raising potential doubts about the analysis of presuppositional clauses as DPs with a silent D.
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Ghazi, Amirhossein, Zahir Barahmand et Lars Erik Øi. « The Effect of Climate and Orientation on the Energy Performance of a Prefab House in Norway ». Dans 64th International Conference of Scandinavian Simulation Society, SIMS 2023 Västerås, Sweden, September 25-28, 2023. Linköping University Electronic Press, 2023. http://dx.doi.org/10.3384/ecp200009.
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Norway has a wide range of climatic conditions throughout the country. The climate varies from coastal to inland areas. Geographic latitude and longitude, as well as the gulf stream oceanic flow, account for this phenomenon. Different climate types can certainly affect residential building heating energy demands and make overheating more likely. On the other hand, a building's orientation has an impact on its heating energy requirements. A building's orientation affects how much solar gain it receives and how much wind it receives over the course of the year. Employing DesignBuilder® software, This study examines how different orientations affect the energy performance of a pre-designed house with and without solar photovoltaic panels in typical Norwegian climates. The results confirm that in different locations, the optimal situation is South-East and the lowest energy consumption without and with photovoltaic panels belongs to Bergen with 83305 Wh/m2 and Oslo with 29442 Wh/m2 respectively. This comparative study will be helpful to stakeholders in the building ecosystem (municipalities, engineers, and designers, building companies, suppliers, and residents) in making more informed decisions.
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Hondred, John, Brian Henslee, Tony Thampan, Yi Ding, Laurence Toomey et Greg Less. « Advanced Nonflammable Battery ». Dans 2024 NDIA Michigan Chapter Ground Vehicle Systems Engineering and Technology Symposium. 2101 Wilson Blvd, Suite 700, Arlington, VA 22201, United States : National Defense Industrial Association, 2024. http://dx.doi.org/10.4271/2024-01-3951.
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<title>ABSTRACT</title> <p>As military vehicles expand in mission roles and in offensive and defensive weaponry, there is an ever-increasing demand for greater energy storage. Moreover, with the technological breakthroughs in Direct Energy Weapons and Active Protective Systems (e.g., high-energy laser and high-power microwave systems, especially for prevention of UAVs), there is a commensurate need for increased energy density military power supplies to provide electrification to these Next Generation Combat Vehicles (Lynx, Griffin III, and CV-90). Current lithiumion batteries for vehicles (e.g., 6T) have limited energy density (~100 Wh/kg), which are not sufficient for the high energy and power needs of military vehicles. Additionally, they typically use carbonate electrolytes which are extremely flammable. To address these issues, CRG developed a high specific energy (>225 Wh/kg) lithium ion battery (LIB) pouch cell that could be integrated into current military vehicle battery formats. This cell utilizes a high capacity graphite anode, a thermally safe cathode with high energy density, and a non-flammable temperature/voltage stable electrolyte. The developed cell is an improvement over the current safety and operational performance of military vehicle batteries.</p> <p><bold>Citation:</bold> <italic>J. Hondred, B. Henslee, T Thampan, Y. Ding, L. Toomey, G. Less, “Advanced Non-flammable Battery”</italic> In <italic>Proceedings of the Ground Vehicle Systems Engineering and Technology Symposium</italic> (GVSETS), NDIA, Novi, MI, Aug. 16-18, 2022.</p>
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Ng, Wanyi, Mrinalgouda Patil et Anubhav Datta. « Hydrogen Fuel Cell and Battery Hybrid Architecture for Range Extension of Electric VTOL (eVTOL) Aircraft ». Dans Vertical Flight Society 75th Annual Forum & Technology Display. The Vertical Flight Society, 2019. http://dx.doi.org/10.4050/f-0075-2019-14490.
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The objective of this paper is to study the impact of combining hydrogen fuel cells with lithium-ion batteries through an ideal power sharing architecture to mitigate the poor range and endurance of battery powered electric vertical takeoff and landing (eVTOL) aircraft. The benefits of combining the two sources is first demonstrated by a conceptual sizing of an electric tiltrotor for an urban air taxi mission of 75 mi cruise and 5 min hover. It is shown that an aircraft of 5000-6000 lb gross weight can carry a practical payload of 500 lb (2-3 seat) with present levels of battery specific energy (150 Wh/kg) if only a battery-fuel cell hybrid powerplant is used, combined in an ideal power sharing manner, as long as high burst C-rate batteries are available (4-10 C) for a limited duration (2.5 min). A powerplant using batteries alone can carry less than half the payload; fuel cells alone can not lift off the ground. The operation of such a parallel system is explained using systematic hardware testing and modeling and simulation. The concepts of unregulated and regulated power sharing architectures are described. A regulated architecture that can implement ideal power sharing is built-up in a step-by-step manner. It is found only two switches and three DC-to-DC converters are necessary, and if placed appropriately, are sufficient to achieve the desired power flow. The power system model is validated with test data and used to gain fundamental understanding of the power sharing architecture.
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Alotaibi, Abdulaziz M., Taha K. Makhdoom et Awad Bin Saud Alquaity. « Pathways to Improve the Energy Efficiency of Residential Air-Conditioning Systems in Saudi Arabia ». Dans ASME 2023 17th International Conference on Energy Sustainability collocated with the ASME 2023 Heat Transfer Summer Conference. American Society of Mechanical Engineers, 2023. http://dx.doi.org/10.1115/es2023-108145.
Texte intégralRésumé :
Abstract The residential sector in Saudi Arabia consumes more than half of the total electricity generated, with room air conditioners being among the most significant contributors. The current work aims to estimate the current and future energy savings and CO2 emission reductions possible under three different scenarios: Business as Usual (BAU), Continuous Improvement Scenario (CIS), and Accelerated Improvement Scenario (AIS) up to 2030. The BAU scenario presents the energy consumption and CO2 emissions assuming the current Energy Efficiency Ratio (EER) of 11.8 BTU/Wh is maintained till 2030. CIS takes into account an improvement of 5% in EER of new air conditioner (AC) stock every 2 or 5 years, and AIS considers an improvement of 10% in EER of new ACs every 2 or 5 years. Additionally, the energy savings and CO2 emission reductions possible through varying penetration levels of newly introduced refrigerant (R32) have been estimated for all three scenarios with 2 year intervals. The BAU scenario is promising resulting in energy savings of up to 21.4 TWh in 2030 compared to 2020 energy consumption figures. However, implementing AIS with 2 year intervention intervals leads to significant additional energy savings of 12.7 TWh by 2030 as compared to BAU scenario. Even implementing CIS with 2 year intervention intervals leads to additional energy savings exceeding 3 TWh by 2030. The introduction of the new refrigerant (R32) leads to modest cumulative energy savings of 2.5 TWh in the best-case scenario and suggests that the policy focus can be directed towards increasing the EER of residential AC systems.
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Dessornes, O., S. Landais, R. Valle, A. Fourmaux, S. Burguburu, C. Zwyssig et Z. Kozanecki. « Advances in the Development of a Micro-Gas Turbine Engine at Onera ». Dans ASME Turbo Expo 2013 : Turbine Technical Conference and Exposition. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/gt2013-94005.
Texte intégralRésumé :
To reduce the size and weight of power generation machines for portable devices, several systems to replace the currently used heavy batteries are being investigated worldwide. As micro gas turbines are expected to offer the highest power density, several research groups launched programs to develop ultra micro gas turbines: IHI firm (Japan), PowerMEMS Consortium (Belgium). At Onera, a research program called DecaWatt is under development in order to realize a demonstrator of a micro gas turbine engine in the 50 to 100 Watts electrical power range. A single-stage gas turbine is currently being studied. First of all, a calculation of the overall efficiency of the micro gas turbine engine has been carried out according to the pressure ratio, the turbine inlet temperature and the compressor and turbine efficiencies. With realistic hypotheses, we could obtain an overall efficiency of about 5% to 10% which leads to around 200 W/kg when taking into account the mass of the micro gas turbine engine, its electronics, fuel and packaging. Moreover, the specific energy could be in the range 300 to 600 Wh/kg which exceeds largely the performance of secondary batteries. To develop such a micro gas turbine engine, experimental and computational work focused on: • a 10 mm in diameter centrifugal compressor, with the objective to obtain a pressure ratio of about 2.5 • a radial inflow turbine • journal and thrust gas bearings (lobe bearings and spiral grooves) and their manufacturing • a small combustor working with hydrogen or hydrocarbon gaseous fuel (propane) • a high rotation speed micro-generator • the choice of materials Components of this tiny engine were tested prior to the test with all the parts assembled together. Tests of the generator at 700,000 rpm showed a very good efficiency of this component. In the same way, compressor testing has been performed up to 500,000 rpm and has shown that the nominal compression rate at the 840,000 rpm nominal speed should be nearly reached.
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Schooley, Ben, Akanksha Singh, Sarah Floyd, Stephan Pill et John Brooks. « Direct Weighting Interactive Design of Patient Preferences for Shared Decision Making in Orthopaedic Practice ». Dans 13th International Conference on Applied Human Factors and Ergonomics (AHFE 2022). AHFE International, 2022. http://dx.doi.org/10.54941/ahfe1002105.
Texte intégralRésumé :
Patients need the ability to accurately and efficiently communicate their preferences across outcome domains to their healthcare providers.1-7 No existing system provides an efficient and timely approach to collect and communicate patient preferences across outcome domains to support shared decision making (SDM) in orthopaedic practice.2-4,8-19 The overarching goal of this research is to design, build, and test an app that collects baseline patient preferences and health status across orthopaedic outcomes and reports this information to the provider for use in patient care. A core component of the app is a Direct-Weighting (DW) preference assessment approach, originated from our prior research, and applied in a touchscreen based interactive design. It is envisioned that patients will use the app after scheduling a first visit to a surgeon for a new orthopaedic condition. Direct weighting (DW) approaches calculate patient-specific preference weights across outcomes by asking patients to disperse portions of a hypothetical “whole” across outcomes in a manner that reflects a patient’s preferences.20 DW has low respondent burden but it requires respondents to make “implicit” comparisons which may be difficult to conceptualize.20 However, the DW approach has become generally accepted in the quality-of-life literature and it has been shown that patients dividing up pieces of a “pie” across quality-of-life domains yields valid representations of patient preferences across the domains.20-22 However, the DW approach has not been validated with specific clinical scenarios using a clinically focused set of outcomes or by using a mobile software app. Drawing on prior research, we iteratively design and develop the app with input from prior DW research, informaticians, and clinicians. We use a qualitative approach to pilot test the app with 20 first-time visit patients presenting with joint pain and/or function deficiency. Participants were interviewed about their outcome preferences for care, used the app to prioritize outcome preferences, answered interview questions about their experience using the app, and completed a mHealth App Usability Questionnaire (MAUQ). Interview questions focused on the utility and usability of the mobile app for communicating with their provider, and capability of the app to capture their outcome preferences. Results validated five core preference domains, with most users dividing their 100-point allocation across 1-3 domains. The tool received moderate to high usability scores. Patients with older age and lower literacy found the DW approach more difficult in terms of allocating 100 points across 5 domains. Suggestions for DW interface interaction improvement included instantiation of a token/points oriented DW preference scoring methodology rather than a 1-10 sliding scale approach for improved preference weighting cognition and SDM with a provider. As more patient reported outcome (PRO) apps hit the marketplace across a broad spectrum of health conditions, these results provide evidence for a DW approach and interactive design for patients to communicate their treatment preferences to their providers.References:1.Baumhauer JF, Bozic KJ. Value-based Healthcare: Patient-reported Outcomes in Clinical Decision Making. Clin Orthop Relat Res. 2016;474(6):1375-1378.2. Slim K, Bazin JE. From informed consent to shared decision-making in surgery. J Visc Surg. 2019;156(3):181-184.3. Damman OC, Jani A, de Jong BA, et al. The use of PROMs and shared decision-making in medical encounters with patients: An opportunity to deliver value-based health care to patients. J Eval Clin Pract. 2020;26(2):524-540.4. Sorensen NL, Hammeken LH, Thomsen JL, Ehlers LH. Implementing patient-reported outcomes in clinical decision-making within knee and hip osteoarthritis: an explorative review. BMC Musculoskelet Disord. 2019;20(1):230.5. Kamal RN, Lindsay SE, Eppler SL. Patients Should Define Value in Health Care: A Conceptual Framework. J Hand Surg Am. 2018;43(11):1030-1034.6. Charles C, Gafni A, Whelan T. Decision-making in the physician-patient encounter: revisiting the shared treatment decision-making model. Social Science & Medicine. 1999;49(5):651-661.7. Niburski K, Guadagno E, Mohtashami S, Poenaru D. Shared decision making in surgery: A scoping review of the literature. Health Expect. 2020.8. Selten EM, Geenen R, van der Laan WH, et al. Hierarchical structure and importance of patients' reasons for treatment choices in knee and hip osteoarthritis: a concept mapping study. Rheumatology (Oxford). 2017;56(2):271-278.9. Kannan S, Seo J, Riggs KR, Geller G, Boss EF, Berger ZD. Surgeons' Views on Shared Decision-Making. J Patient Cent Res Rev. 2020;7(1):8-18.10. Briffa N. The employment of Patient-Reported Outcome Measures to communicate the likely benefits of surgery. Patient Relat Outcome Meas. 2018;9:263-266.