60 research outputs found
Enhancing a just transition finance system for carbon-intensive industries
No full textJunije Zhang, Fei Xie, Minjun Chang, Yufei Dai, Mengfu Ha
Pt-Cu Nanosheet Catalysts for Pemfcs with Enhanced Durability through Galvanic Replacement Reaction
No full text<jats:p> In order to cope with the cataclysmic environmental problems, PEMFCs are in the spotlight as a next-generation renewable energy utilization candidate, but the high platinum unit price used in the catalyst layer is still a sticking point. Accordingly, attempts are being made to maximize platinum utilization and improve performance through shape control of the catalyst, but there is a problem in that the structure collapses under extreme PEMFCs driving conditions and the performance deteriorates rapidly, resulting in wistful durability. In this work, Pt-Cu nanosheet with 15~20 nm lateral size and 1 nm thickness was synthesized on carbon support (PtCu NS/C) and further enhanced durability through surface copper substitution using galvanic replacement reaction (G-PtCu NS/C). To clarify the catalyst structure in more detail, acid-leached Pt-Cu nanosheet (A-PtCu NS/C) was synthesized by eluting copper on the surface, and the differences in electronic structure were compared through XAS and XPS. In the half-cell configuration, G-PtCu NS/C demonstrated high performance and excellent durability retention after 30,000 square-wave cycles (SWC) of accelerated stress test (AST). Moreover, G-PtCu NS/C showed marginal shift in CO adsorption peak after AST, indicating the high stability of catalyst structure. In the full-cell test, performance of G-PtCu NS/C after 30,000 SWC AST is consistent to initial performance, while PtCu NS/C showed noticeable power density drop at high current density region. Ex-situ EDS elemental mapping and XRF of membrane-electrode assembly (MEA) after AST confirms that transition metal dissolution on G-PtCu NS/C was imperceptible. Our study suggests new engineering method for shaped controlled catalysts to be applied on PEMFCs. </jats:p>
Iridium Nanosheet Catalysts Supported on Titanium Oxide for Oxygen Evolution Reaction in Polymer Electrolyte Membrane Water Electrolysis
No full textIntroducing Iridium Nanosheet Catalysts on Titanium Oxide for Oxygen Evolution Reaction in PEMWE
No full textINFORMATION DESIGN IN CONTROLLING EPIDEMICS
No full textThis dissertation studies the use of information design to reduce the spread of an infection. In particular, I investigate whether central planners (senders) with more information can leverage the information advantage to improve social welfare. In the first chapter, I analyze a single sender's best information revelation policy when individuals (receivers) have heterogeneous social activity levels and decide their binary protection levels, which further determine a transmission network over which the infection spreads. I establish that it is optimal to obfuscate information only for intermediate transmission rates and for small initial infection probabilities. In the second chapter, I further explore the use of information when there are multiple senders, each caring their own population. I characterize the population's equilibrium actions given any information and the equilibrium information disclosure policies between two senders. I establish that the two senders will disclose no information when they are either heavily economically concerned with high economic costs and a low prior belief about the disease, or health concerned with low economic costs. The senders will disclose partial information when one sender is heavily economically concerned with high economic costs and a high prior belief about the disease, while the other sender is either heavily economically concerned with high economic costs or health concerned with low economic costs. The senders will disclose full information when at least one sender is either concerned but not extremely concerned about the economy or health concerned with high economic costs.</p
Deep Learning for Toxicity and Disease Prediction
No full textThis eBook is a collection of articles from a Frontiers Research Topic. Frontiers Research Topics are very popular trademarks of the Frontiers Journals Series: they are collections of at least ten articles, all centered on a particular subject. With their unique mix of varied contributions from Original Research to Review Articles, Frontiers Research Topics unify the most influential researchers, the latest key findings and historical advances in a hot research area! Find out more on how to host your own Frontiers Research Topic or contribute to one as an author by contacting the Frontiers Editorial Office: frontiersin.org/about/contac
Real-time pricing related short-term load forecasting
No full textProceedings of the International Conference on Energy Management and Power Delivery, EMPD2411-4160023
An Experimental Study on the Measurement of Fuel to Air Ratio Using Flame Chemiluminescence
No full textThis study is aiming at establishing the relationship between the optical signal of flame and an equivalent ratio of flame. In this experiment, flame optical signal in a furnace is measured using photodiode. The combustion system which is composed of metal fiber burner and vertical furnace and flame chemiluminescence is measured at various experimental conditions. In this study, the flame chemiluminescence of laminar premixed flame is measured by using commercially available photodiode. It is experimentally investigated the relationship between equivalent ratio and photodiode signal. In addition, The strategy of combustion control method is proposed by using the optical signal and fuel pressure. The results showed that certain relationship between optical data of photodiode and equivalence ratio exists and this leads to the successful application of this system for instantaneous measurement of equivalence ration of the combustion system
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