Results 151 to 160 of about 282,015 (284)

Identification of maximal C*-covers of some operator algebras

Proceedings of the American Mathematical Society
We use results on inclusions of free products and extensions of completely positive maps to determine the maximal C ∗ ^* -envelope for upper triangular 3 × 3 3 \times 3 matrices.
openaire   +2 more sources

Reduction of Oxide Inclusions During the High‐Frequency Welding of Steel via a Nonthermal Ar/H2 Plasma Jet

Advanced Engineering Materials, EarlyView.
High‐frequency (HF) welding of steel is limited by oxide inclusions that degrade weld quality. This study demonstrates, for the first time, the integration of a nonthermal Ar/H2 dielectric barrier discharge (DBD) plasma jet into HF welding. Local plasma treatment provides effective shielding and in‐situ oxide reduction, resulting in markedly fewer and ...
Viktor Udachin, Lienhard Wegewitz, René Gustus, Henning Wiche, Wolfgang Maus‐Friedrichs   +4 more
wiley   +1 more source

Pairwise Comparison of Effects of Linear vs. Change of Direction Short Bout Sprint Intervals on Physical Performance of Youth Male Soccer Players. [PDF]

Sports (Basel)
Sagat P.
europepmc   +1 more source

Electrical Conductivities of Conductors, Semiconductors, and Their Mixtures at Elevated Temperatures

Advanced Engineering Materials, EarlyView.
This article presents a comprehensive review of temperature‐dependent electrical conductivity data for multiple material classes at elevated temperatures, highlighting a persistent conductivity gap between metals and semiconductors in the range of 102$\left(10\right)^{2}$– 107$\left(10\right)^{7}$ S/m. Metal–ceramic irregular metamaterials are proposed
Valentina Torres Nieto, Marcia A. Cooper
wiley   +1 more source

Progressive endothelial coverage enhances hemocompatibility and prevents calcification in bioprosthetic valve tissue. [PDF]

Angiogenesis
Poitier B, Richez U, Roux-de-Bezieux J, Ivak P, Rancic J, Charrier H, Latremouille C, Peronino C, Roussel JC, Rossi E, El-Batti S, Kindo M, Saubamea B, Pya Y, Lesaffre C, Capel A, Achouh P, Netuka I, Smadja DM.   +18 more
europepmc   +1 more source

Air‐Pressure–Actuated Vibroacoustic Metamaterial With Tunable Bandgap: Design, Modeling, and Characterization

Advanced Engineering Materials, EarlyView.
This article presents the design, modeling, and characterization of air‐pressure–actuated programmable vibroacoustic metamaterials (PVAMM). The study focuses on leveraging air pressure to dynamically tune resonance frequencies for effective noise attenuation.
William Kaal, Michael M. Becker, Sarah C. L. Fischer   +2 more
wiley   +1 more source

On manifolds with almost non-negative Ricci curvature and integrally-positive k th -scalar curvature. [PDF]

Math Ann
Cucinotta A, Mondino A.
europepmc   +1 more source

Investigation of Thermo‐Chemical Processes in Commercial MgO‐C Refractory Bricks With and Without MgO‐C Recyclate at Elevated Temperatures

Advanced Engineering Materials, EarlyView.
This study investigates thermo‐chemical processes during high‐temperature testing of two commercial MgO‐C brick grades, one containing 47.5 wt.% MgO‐C recyclate. Using ETV, DTA/TG‐MS, XRD, and SEM/EDS/EBSD, mechanisms such as carbothermal reduction of magnesia, impurity incorporation into the secondary MgO surface layer, and calcium‐rich phase ...
Alexander Schramm, Jana Hubálková, Christian Schimpf, Thomas Schemmel, Christos G. Aneziris, Anja Weidner, Horst Biermann   +6 more
wiley   +1 more source

Transcatheter Aortic Valve Replacement in Forme Fruste Bicuspid Aortic Valve With the Dedicated LIRA Sizing Method. [PDF]

Struct Heart
Zanda G, Bellini B, Romano V, Iannopollo G, Vella C, Russo F, Ferri LA, Ancona MB, Esposito A, Montorfano M.   +9 more
europepmc   +1 more source

Al–Cu Composite Casting of Laser‐Deoxidized Copper: Bonding, Interfacial Chemistry, and Thermal Conductivity

Advanced Engineering Materials, EarlyView.
This study investigates laser‐based oxide removal of Cu inserts in oxygen‐free conditions and examines long‐term oxidation kinetics and surface chemistry under different atmospheres via X‐ray photoelectron spectroscopy. Al–Cu compound casting with differently oxidized surfaces is performed, and intermetallic phase formation, morphology, and thermal ...
Timon Steinhoff, Finn‐Lennard Janthur, Sascha Zimmermann, Sarah Seffer, Jörg Hermsdorf, René Gustus, Ludger Overmeyer, Wolfgang Maus‐Friedrichs, Hans Jürgen Maier, Christian Klose   +9 more
wiley   +1 more source