Results 71 to 80 of about 53,258 (285)

Transonic wing DFVLR-F4 as European test model [PDF]

A transonic wing, the DFVLR-F4 was designed and tested as a model in European transonic wind tunnels and was found to give performance improvements over conventional wings.
Redeker, G., Schmidt, N.
core   +1 more source

Critical properties of spherically symmetric accretion in a fractal medium

, 2007
Spherically symmetric transonic accretion of a fractal medium has been studied in both the stationary and the dynamic regimes. The stationary transonic solution is greatly sensitive to infinitesimal deviations in the outer boundary condition, but the ...
Abramowicz, Afshordi, Arnab K. Ray, Artemova, Axford, Babichev, Balazs, Barabási, Begelman, Blumenthal, Bohr, Bonazzola, Bonazzola, Bondi, Brinkmann, Burkert, Chakrabarti, Chakrabarti, Chandrasekhar, Chaudhury, Choudhuri, Cowie, Crovisier, Das, Das, Das, Das, Debnath, Elmegreen, Faison, Falgarone, Frank, Gaite, Garlick, Goswami, Heithausen, Hill, Jordan, Kazhdan, Klessen, Kovalenko, Langer, Larson, Malec, Mandal, Mandelbrot, Markovic, Matsumoto, Michel, Moncrief, Muchotrzeb-Czerny, Mészáros, Mészáros, Nirupam Roy, Nowak, Paczyński, Parker, Parker, Petterson, Ray, Ray, Ray, Ren, Roy, Semelin, Shu, Stellingwerf, Strogatz, Tarasov, Theuns, Titarchuk, Titarchuk, Toropin, Tsuribe, Visser, Vitello, Zampieri, Zaslavsky   +77 more
core   +1 more source

NanoMOF‐Based Multilevel Anti‐Counterfeiting by a Combination of Visible and Invisible Photoluminescence and Conductivity

Advanced Functional Materials, EarlyView.
This study presents novel anti‐counterfeiting tags with multilevel security features that utilize additional disguise features. They combine luminescent nanosized Ln‐MOFs with conductive polymers to multifunctional mixed‐matrix membranes and powder composites. The materials exhibit visible/NIR emission and matrix‐based conductivity even as black bodies.
Moritz Maxeiner, Ruben Maile, Murat Cuvalli, Andreas Wolf, Ayisha Komal, Robert Oestreich, Christoph Janiak, Karl Mandel, Alexander Knebel, Klaus Müller‐Buschbaum   +9 more
wiley   +1 more source

Prediction of transonic flutter for a supercritical wing by modified strip analysis and comparison with experiment [PDF]

Use of a supercritical airfoil can adversely affect wing flutter speeds in the transonic range. As adequate theories for three dimensional unsteady transonic flow are not yet available, the modified strip analysis was used to predict the transonic ...
Desmarais, R. N., Farmer, M. G., Wynne, E. C., Yates, E. C., Jr.   +3 more
core   +1 more source

MnI‐Functionalized Covalent Organic Framework as Efficient Electrocatalyst for CO2 Reduction in a Catholyte‐Free Zero‐Gap Electrolyzer

Advanced Functional Materials, EarlyView.
This work demonstrates the successful integration of a phenanthroline‐based 2D COF with MnI catalytic sites into a catholyte‐free membrane‐electrode‐assembly cell for CO2 electroreduction. The crystalline COF actively suppresses Mn⁰–Mn⁰ dimerization, achieving a turnover frequency of 617 h⁻¹ at 2.8 V (full‐cell potential), and enabling stable operation.
Laura Spies, Marcos Eduardo G. Carmo, Gonçalves J. Marrenjo, Stephan Reuther, Patrick Ganswindt, Antonio Otavio T. Patrocinio, Thomas Bein, Osmando F. Lopes, Jenny Schneider   +8 more
wiley   +1 more source

Computational aspects of the prediction of multidimensional transonic flows in turbomachinery [PDF]

The analytical prediction and description of transonic flow in turbomachinery is complicated by three fundamental effects: (1) the fluid equations describing the transonic regime are inherently nonlinear, (2) shock waves may be present in the flow, and ...
Oliver, D. A., Sparis, P.
core   +1 more source

Radial transonic shock solutions of Euler-Poisson system in convergent nozzles

, 2017
Given constant data of density $\rho_0$, velocity $-u_0{\bf e}_r$, pressure $p_0$ and electric force $-E_0{\bf e}_r$ for supersonic flow at the entrance, and constant pressure $p_{\rm ex}$ for subsonic flow at the exit, we prove that Euler-Poisson system
Bae, Myoungjean, Park, Yong
core   +1 more source

Biodegradable and Recyclable Luminescent Mixed‐Matrix‐Membranes, Hydrogels, and Cryogels based on Nanoscale Metal‐Organic Frameworks and Biopolymers

Advanced Functional Materials, EarlyView.
The study presents biodegradable and recyclable mixed‐matrix membranes (MMMs), hydrogels, and cryogels using luminescent nanoscale metal‐organic frameworks (nMOFs) and biopolymers. These bio‐nMOF‐MMMs combine europium‐based nMOFs as probes for the status of the materials with the biopolymers agar and gelatine and present alternatives to conventional ...
Moritz Maxeiner, Julian Burkhart, Kateryna Borysova, Chiara Mazzariol, Klaus Müller‐Buschbaum   +4 more
wiley   +1 more source

Aerodynamic design for improved manueverability by use of three-dimensional transonic theory [PDF]

Improvements in transonic maneuver performance by the use of three-dimensional transonic theory and a transonic design procedure were examined. The FLO-27 code of Jameson and Caughey was used to design a new wing for a fighter configuration with lower ...
Campbell, R. L., Ferris, J. C., Mann, M. J.   +2 more
core   +1 more source

Biomass Native Structure Into Functional Carbon‐Based Catalysts for Fenton‐Like Reactions

Advanced Functional Materials, EarlyView.
This study indicates that eight biomasses with 2D flaky and 1D acicular structures influence surface O types, morphology, defects, N doping, sp2 C, and Co nanoparticles loading in three series of carbon, N‐doped carbon, and cobalt/graphitic carbon. This work identifies how these structural factors impact catalytic pathways, enhancing selective electron
Wenjie Tian, Jingkai Lin, Zhihao Tian, Selusiwe Ncube, Huayang Zhang, Emiliano Cortés, Hongqi Sun, Shaobin Wang   +7 more
wiley   +1 more source