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Kerner, Manfred,Lim, Du-Hyun,Jeschke, Steffen,Rydholm, Tomas,Ahn, Jou-Hyeon,Scheers, Johan Elsevier 2016 Journal of Power Sources Vol.332 No.-
<P><B>Abstract</B></P> <P>The overall safety of Li-ion batteries is compromised by the state-of-the-art electrolytes; the thermally unstable lithium salt, lithium hexafluorophosphate (LiPF<SUB>6</SUB>), and flammable carbonate solvent mixtures. The problem is best addressed by new electrolyte compositions with thermally robust salts in low flammability solvents. In this work we introduce electrolytes with either of two lithium nitrile salts, lithium 4,5-dicyano-1,2,3-triazolate (LiDCTA) or lithium 4,5-dicyano-2-trifluoromethylimidazolide (LiTDI), in solvent mixtures with high flashpoint adiponitrile (ADN), as the main component. With sulfolane (SL) and ethylene carbonate (EC) as co-solvents the liquid temperature range of the electrolytes are extended to lower temperatures without lowering the flashpoint, but at the expense of high viscosities and moderate ionic conductivities. The anodic stabilities of the electrolytes are sufficient for LiFePO<SUB>4</SUB> cathodes and can be charged/discharged for 20 cycles in Li/LiFePO<SUB>4</SUB> cells with coulombic efficiencies exceeding 99% at best. The excellent thermal stabilities of the electrolytes with the solvent combination ADN:SL are promising for future electrochemical investigations at elevated temperatures (> 60 °C) to compensate the moderate transport properties and rate capability. The electrolytes with EC as a co-solvent, however, release CO<SUB>2</SUB> by decomposition of EC in presence of a lithium salt, which potentially makes EC unsuitable for any application targeting higher operating temperatures.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Solvents and salts with nitrile groups are combined into novel electrolytes. </LI> <LI> Sulfolane in adiponitrile provides thermally stable, high flashpoint electrolytes. </LI> <LI> LiDCTA and LiTDI electrolytes have high oxidation stability (4.5 V vs Li+/Li°). </LI> <LI> Ethylene carbonate is decomposed into CO2 in the presence of lithium salt. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Performance of Adaptive TMD for Tall Building Damping
Weber, Felix,Yalniz, Fatih,Kerner, Deniz,Huber, Peter Council on Tall Building and Urban Habitat Korea 2021 International journal of high-rise buildings Vol.10 No.2
This research investigates the potential of Adaptive TMDs for tall building damping. The Adaptive TMD under consideration is based on real-time controlled hydraulic dampers generating purely dissipative control forces. The control approach is designed to enhance the Adaptive TMD efficiency for moderate wind loads with return periods below 50 years. The resulting enhanced TMD efficiency is used to reduce the pendulum mass by 15% compared to the passive TMD while still guaranteeing the acceleration limits of the one and ten year return period winds. Furthermore, the adaptive control approach is designed to disproportionally increase the controlled damping force at wind loads with return periods of 50 years and more in order to reduce the maximum relative motion of the Adaptive TMD with only 85% pendulum mass. Compared to the passive TMD with 100% pendulum mass the maximum relative motion is reduced by 20%. Both the pendulum mass reduction and the maximum relative motion reduction significantly reduce the foot print of the Adaptive TMD which is highly desirable from the economic point of view.
PFDL: A Production Flow Description Language for an Order-Controlled Production
Peter Detzner,Andreas Ebner,Maximilian Horstrup,Soren Kerner 제어로봇시스템학회 2022 제어로봇시스템학회 국제학술대회 논문집 Vol.2022 No.11
In Industry 4.0, the order-controlled production (OCP) is an order-centric manufacturing approach. Among others, OCP favors a dynamic (re-)assignment of production resources that are required to execute the order. In this paper, we propose a uniform description format of production processes - the Production Flow Description Language (PFDL - a fully automated processable input for OCP environments. The PFDL enables flexible use of existing production resources by taking advantage of the increased factory floor connectivity. Compared to existing solutions, the PFDL supports concurrency, data handling between processes, synchronization, and flow control.
( Harsha Pokkalla ),( Kishalve Pethia ),( Benjamin Glass ),( Jennifer Kaplan Kerner ),( Ling Han ),( Catherine Jia ),( Ryan Huss ),( Mar-ianne Camargo ),( Kathryn Kersey ),( Chuhan Chung ),( G. Mani S 대한간학회 2020 춘·추계 학술대회 (KASL) Vol.2020 No.1
Aims: Fibrosis is the primary determinant of disease progression in patients with nonalcoholic steatohepatitis (NASH), but the prognostic impact of other histological features is unclear. We used a machine learning(ML) approach to identify novel morphologic features and associations with disease progression in NASH patients with F3/4 fibrosis. Methods: Biopsies from 644 patients screened in phase3 trial of selonsertib (STELLAR-4) were scored by a central pathologist( CP) according to the NASH CRN and Ishak staging systems. The PathAI research platform(PathAI, Boston, MA) was trained a convolutional neural network(CNN) with >68,000 annotations (e.g. steatosis, ballooning, lobular/portal inflammation) collected from 75 board-certified pathologists on images of H&E and trichrome(TC) stained slides. For staging fibrosis, CNN models were trained using slide-level pathologist scores to recognize unique patterns associated with each stage within fibrotic regions of TC images. 202 features were extracted from biopsy images from patients (F3-F4) enrolled in the STELLAR trials. Cox regression was used to identify associations between these features with progression to cirrhosis in F3 patients, and liver-related events (e.g. decompensation, transplantation, death) in F4 patients. Results: 1526 NASH patients with F3-F4 fibrosis (median age 59 yrs, 73% diabetic, 52% F4) were included. During a median follow-up of 16.5 mos, 14.5% (105/726) of F3 patients progressed to cirrhosis, and over 15.9 mos, 2.8% (22/800) of F4 patients had liver-related events. Progression to cirrhosis was associated with greater area of Ishak 6 fibrosis and portal inflammation (Figure). Similar associations were observed in F4 patients, with hepatocellular ballooning and clinical events. In F3, a greater proportion of area of Ishak 1 fibrosis and steatosis were associated with a reduced risk of progression. In F4, area of steatosis was similarly protective, while proportion of Ishak Stage 1 Fibrosis over Ishak scored area trended towards protective. Conclusions: Liver histological evaluation using ML approach identified novel features associated with progression in NASH patients with advanced fibrosis. These data support the utility of ML approaches to evaluation of liver histology as endpoints in NASH clinical trials.
Sand particle-Induced deterioration of thermal barrier coatings on gas turbine blades
Murugan, Muthuvel,Ghoshal, Anindya,Walock, Michael J.,Barnett, Blake B.,Pepi, Marc S.,Kerner, Kevin A. Techno-Press 2017 Advances in aircraft and spacecraft science Vol.4 No.1
Gas turbines operating in dusty or sandy environment polluted with micron-sized solid particles are highly prone to blade surface erosion damage in compressor stages and molten sand attack in the hot-sections of turbine stages. Commercial/Military fixed-wing aircraft engines and helicopter engines often have to operate over sandy terrains in the middle eastern countries or in volcanic zones; on the other hand gas turbines in marine applications are subjected to salt spray, while the coal-burning industrial power generation turbines are subjected to fly-ash. The presence of solid particles in the working fluid medium has an adverse effect on the durability of these engines as well as performance. Typical turbine blade damages include blade coating wear, sand glazing, Calcia-Magnesia-Alumina-Silicate (CMAS) attack, oxidation, plugged cooling holes, all of which can cause rapid performance deterioration including loss of aircraft. The focus of this research work is to simulate particle-surface kinetic interaction on typical turbomachinery material targets using non-linear dynamic impact analysis. The objective of this research is to understand the interfacial kinetic behaviors that can provide insights into the physics of particle interactions and to enable leap ahead technologies in material choices and to develop sand-phobic thermal barrier coatings for turbine blades. This paper outlines the research efforts at the U.S Army Research Laboratory to come up with novel turbine blade multifunctional protective coatings that are sand-phobic, sand impact wear resistant, as well as have very low thermal conductivity for improved performance of future gas turbine engines. The research scope includes development of protective coatings for both nickel-based super alloys and ceramic matrix composites.