Results 111 to 120 of about 341,826 (304)

Planetary nebulae in the elliptical galaxy NGC 821: kinematics and distance determination

, 2010
Using a slitless spectroscopy method with the 8.2 m Subaru telescope and its FOCAS Cassegrain spectrograph, we have increased the number of planetary nebula (PN) detections and PN velocity measurements in the flattened elliptical galaxy NGC 821.
A. M. Teodorescu, A. Riffeser, Alard, Blakeslee, Ciardullo, Ciardullo, de Vaucouleurs, F. Bernardi, Feldmeier, Forestell, Gebhardt, Kashikawa, Kormendy, Kudritzki, Monet, Méndez, Méndez, Méndez, Méndez, Peng, R. H. Méndez, R. P. Kudritzki, Schlegel, Teodorescu, Tonry   +24 more
core   +1 more source

In situ characterization of high-temperature mechanical behaviors of freestanding Si, BSAS and Yb2SiO5 environmental barrier coatings by three-point bending tests based on digital image correlation

Results in Surfaces and Interfaces, 2023
The high-temperature mechanical properties and failure mechanisms of Si, BSAS and Yb2SiO5 ceramic materials are important for environmental barrier coatings.
Xizhi Fan, Xixing Deng, Weiguo Mao, Zhangji Luo, Wenjie Ye, Cuiying Dai   +5 more
doaj  

Tribology of ZrC Coatings and Spherical Tips Acquired with Extraordinarily Stiff, Metal Atomic Force Microscopy Probes

Advanced Engineering Materials, EarlyView.
In this research, ZrC coatings are evaluated against various counterprobes at the microscale using novel super‐stiff atomic force microscopy cantilevers. The chemical composition of the coating is shown to be an important factor influencing coating hardness and Young's modulus, while surface roughness, counterprobe hardness, and surface energy are the ...
Piotr Jenczyk, Marcin Michałowski, Bogdan Warcholiński, Michał Milczarek, Adam Gilewicz   +4 more
wiley   +1 more source

Synthetic Population of Binary Cepheids. II. The Effect of Companion Light on the Extragalactic Distance Scale

The Astrophysical Journal, 2023
Because of their period–luminosity relation (PLR), classical Cepheids play a key role in the calibration of the extragalactic distance scale and the determination of the Hubble–Lemaître constant H _0 .
Paulina Karczmarek, Gergely Hajdu, Grzegorz Pietrzyński, Wolfgang Gieren, Weronika Narloch, Radosław Smolec, Grzegorz Wiktorowicz, Krzysztof Belczynski   +7 more
doaj   +1 more source

Additive Manufacturing of Highly Alloyed Aluminum–Lithium

Advanced Engineering Materials, EarlyView.
Al–Li alloys, promising for future lightweight constructions due to their low density and high stiffness, are limited to 9 at% lithium in commercial forms because of segregation issues. To overcome this traditional limitation, powder bed fusion with an ultrashort pulse laser is used.
Lisa Matthäus, Hagen Peter Kohl, Dongmei Liu, Stephanie Lippmann, Stefan Nolte   +4 more
wiley   +1 more source

The Araucaria Project. Near-Infrared Photometry of Cepheid Variables in the Sculptor Galaxy NGC 55

, 2007
We have obtained deep images in the near-infrared J and K filters of four fields in the Sculptor Group spiral galaxy NGC 55 with the ESO VLT and ISAAC camera. For 40 long-period Cepheid variables in these fields which were recently discovered by Pietrzy{\
Dante Minniti, Fabio Bresolin, Fouque P., Gieren W., Grzegorz Pietrzyński, Igor Soszyński, Jesper Storm, Rolf‐Peter Kudritzki, Udalski A., Wolfgang Gieren   +9 more
core   +1 more source

Inverse Estimation Method of Material Randomness Using Observation

Crystals, 2020
This study proposes a method for inversely estimating the spatial distribution characteristic of a material’s elastic modulus using the measured value of the observation data and the distance between the measurement points.
Dae-Young Kim, Pawel Sikora, Krystyna Araszkiewicz, Sang-Yeop Chung   +3 more
doaj   +1 more source

The Effect of Elastic–Plastic Mismatch and Interface Proximity on the Fracture Toughness of Ti‐TiN Thin Films

Advanced Engineering Materials, EarlyView.
Multilayering of TiN film with metallic Ti film is adopted to enhance the fracture resistance of TiN thin films. Plastic dissipation within Ti with process zone size of ≈250 nm, along with elastic–plastic mismatch driven changes to crack driving force enhances the crack growth resistance by ten times, enabling physics informed design of optimized ...
Nidhin George Mathews, Aloshious Lambai, Marcus Hans, Jochen M. Schneider, Gaurav Mohanty, Balila Nagamani Jaya   +5 more
wiley   +1 more source

Influence of a Standard Heat Treatment on the Microstructure and Properties of Inconel X‐750 Produced by Laser Powder Bed Fusion

Advanced Engineering Materials, EarlyView.
Ni‐base superalloys produced using additive manufacturing (AM) have a different response to heat treatments when compared to their conventional counterparts. Due to such unpredictability, various alloys with industrial interest are currently overlooked in most prior AM research.
Guilherme Maziero Volpato, Adriano de Souza Pinto Pereira, Steffen Neumeier, Dachamir Hotza, Mathias Göken, Ulrich Tetzlaff, Márcio Celso Fredel   +6 more
wiley   +1 more source

Carath\'eodory's Theorem and moduli of local connectivity [PDF]

, 2015
We give a constructive proof of the Carath\'eodory Theorem by means of the concept of a modulus of local connectivity and the extremal distance of the separating curves of an ...
McNicholl, Timothy, McNicholl, Timothy
core   +2 more sources