Results 201 to 210 of about 2,961,303 (350)

Analysis of Stepped-Wedge Cluster Randomized Trials: A Tutorial Using Marginal Models. [PDF]

Stat Med
Turner EL, Preisser JS, Zhang Y, Wang X, Toles M, Cykert S, Li F, Rathouz PJ.   +7 more
europepmc   +1 more source

Dynamic Testing of Cold Gas Sprayed Bipolar Plates–Porous Transport Layer Coating System in Proton Exchange Membrane Water Electrolysis

Advanced Engineering Materials, EarlyView.
Through direct application of porous transport layer (PTL) on the bipolar plate (BPP) with thermal spraying, the interfacial contact resistance is improved. With the cold gas sprayed BPP–PTL coating system, a proton exchange membrane water electrolysis cell with a cell voltage of Ucell = 1.9 V can be operated up to i = 2.5 A/cm2 in a dynamic mode ...
Kirsten Bobzin, Marvin Erck, Kevin Jasutyn, Katja Radermacher, Andreas Bund, Mario Kurniawan   +5 more
wiley   +1 more source

Factors affecting power in stepped wedge trials when the treatment effect varies with time. [PDF]

Trials
Kenny A, Voldal EC, Xia F, Chan KCG, Heagerty PJ, Hughes JP.   +5 more
europepmc   +1 more source

Low‐Angle Grain Boundaries and Re‐Segregation in Single‐Crystalline Ni‐Base Superalloys

Advanced Engineering Materials, EarlyView.
This work demonstrates that Re‐segregation at low‐angle grain boundaries (LAGBs) in Ni‐base superalloys is influenced by misorientation angle. Advanced microscopy and atom probe tomography reveal that higher misorientation angles increases Re‐segregation.
Alireza B. Parsa, Aparna Saksena, Alesander Kostka, Pascal Thome, Felicitas Scholz, Alexandre Mussi, Christoph Somsen, Baptiste Gault, Jan Frenzel, Gunther Eggeler   +9 more
wiley   +1 more source

Characteristics of an anechoic chamber for fan noise testing [PDF]

Acoustical and mechanical design features of NASA Lewis Research Center's engine fan noise facility are described. Acoustic evaluation of the chamber, which is lined with an array of stepped wedges, is described.
Essary, J. D., Shaw, L. M., Wuzyniak, J. A.   +2 more
core   +1 more source

Effects of multimodal prehabilitation on surgery outcomes: prospective stepped-wedge, hospital-wide implementation study. [PDF]

Br J Surg
Drager LD, Atsma F, Strijker D, van Heusden-Scholtalbers LAG, van Asseldonk MJMD, Rosenstok J, Seeger JPH, Verlaan S, Buffart LM, van Laarhoven CJHM, van den Heuvel B, F4S PREHAB Collaborative Group .   +11 more
europepmc   +1 more source

Corrosion and Process Analysis of a Preoxidized MgO Recyclate‐Based Cermet Anode in Laboratory‐Scale Na‐Cryolite Molten Salt Electrolysis of Aluminum at 1000°C

Advanced Engineering Materials, EarlyView.
EDX elemental map of the pre‐oxidized MgO–steel cermet anode cross section after electrolysis. The development of inert anodes for aluminum electrolysis remains challenging due to the high corrosivity of cryolite‐based melts at 950°C–1000°C. This study investigates the corrosion and process behavior of a carbon‐free MgO–steel cermet anode derived from ...
Alexander Adamczyk, Farhan Hossain, Felipe A. Garcia Paz, Serhii Yaroshevskyi, Felix Drechsler, Daniel Vogt, Christos G. Aneziris, Alexandros Charitos   +7 more
wiley   +1 more source

Self-excited rotor whirl due to tip-seal leakage forces [PDF]

The limitations in the performance of turbomachines which arise as a result of selfexcited vibration were investigated. Bearing forces, elastic hysteresis, and forces from fluid flow through clearances were considered as possible origins.
Leie, B., Thomas, H. J.
core   +1 more source

Resistance Rapid Heating of Aluminum Coatings in an Extreme High Vacuum–Adequate Atmosphere for Hot Stamping

Advanced Engineering Materials, EarlyView.
The subject of this work is the development of a corrosion‐protective coating on steel sheets for form hardening. Rapid heating in an extreme high vacuum (XHV)‐adequate atmosphere is a useful method to prevent oxidation during alloying of 22MnB5 and aluminum to obtain a metallurgical bonding.
Lorenz Albracht, Alexander Schnettger, Ulrich Holländer, Sven Hübner, Bernd‐Arno Behrens, Hans Jürgen Maier   +5 more
wiley   +1 more source

What Is a Stepped-Wedge Cluster Randomized Trial? [PDF]

JAMA Intern Med
Li F, Wang B, Heagerty PJ.
europepmc   +1 more source