Results 91 to 100 of about 84,499 (289)

Photometric and Spectroscopic Analysis of Eight Totally Eclipsing Contact Binaries with Small Mass Ratios

The Astrophysical Journal
This paper selected eight totally eclipsing contact binaries for photometric and spectroscopic studies. Spectral data were analyzed by University of Lyon Spectroscopic analysis Software, and photometric data were analyzed using PHOEBE through Markov ...
Li-Heng Wang, Kai Li, Ya-Ni Guo, Jing-Yi Wang, Xiang Gao, Xing Gao, Guo-You Sun   +6 more
doaj   +1 more source

Photoelectric Observations and Analysis of the Contact Binary W UMa [PDF]

Journal of Astronomy and Space Sciences, 2001
The unpublished photoelectric observations of the contact binary W UMa in ultraviolet, blue, and yellow bandpasses made on four nights during the observing seasons from April, 1984 to May, 1985 were presented.
Chun-Hwey Kim, Chung Uk Lee, Young Woon Kang   +2 more
doaj  

A CCD photometric study of the late type contact binary EK Comae Berenices

, 2010
We present CCD photometric observations of the W UMa type contact binary EK Comae Berenices using the 2 metre telescope of $IUCAA$ Girawali Observatory, India. The star was classified as a W UMa type binary of subtype-W by \citet{sam1996}. The new V band
Borovicka, Csizmadia, Flower, Girardi, Harinder P. Singh, Kinman, Kwee, Li, Lucy, Maceroni, Maceroni, Maceroni, Mochnacki, O’Connell, Prša, Ranjan Gupta, Rucinski, Rucinski, Rucinski, Ruciński, Samec, Sandquist, Schlegel, Schwarzenberg-Czerny, Stetson, Sukanta Deb, T.R. Seshadri, van Hamme, Wilson, Wilson, Wilson, Zhang   +31 more
core   +1 more source

Microstructure Design of Steel‐Spinel Composites via Spark Plasma Sintering Process

Advanced Engineering Materials, EarlyView.
This study illustrates how spark plasma sintering at reduced oxygen partial pressure enables controlled formation of steel‐spinel composites through tailored redox reactions and cation exchange. Comparison of the MgO–Fe2O3, steel–(MgO+Cr2O3), and steel–(MgO+Fe2O3) systems shows how oxygen activity and interface chemistry govern spinel formation, phase ...
Mahnaz Mehdizadehlima, Christian Schimpf, Stefan Martin, Olga Fabrichnaya, David Rafaja   +4 more
wiley   +1 more source

Two Ultralow-mass-ratio Binary Systems at Critical Evolutionary Stages

The Astronomical Journal
In this paper, we present photometric observations and period analysis of two totally eclipsing binaries with extremely low-amplitude light curves. Both binaries exhibit typical W Ursae Majoris-type light curves with total eclipses, allowing for the ...
Di-Fu Guo, Kai Li, Fen Liu, Li-heng Wang, Huai-Zhen Li, Xu Chen, Xiang Gao   +6 more
doaj   +1 more source

Microstructure Evolution of a VMnFeCoNi High‐Entropy Alloy After Synthesis, Swaging, and Annealing

Advanced Engineering Materials, EarlyView.
The synthesis and processing (rotary swaging and annealing) of the novel VMnFeCoNi alloy is investigated, alongside the estimation of the grain size effect on hardness. Analysis of a wide grain size range of recrystallized microstructures (12–210 µm) reveals a low annealing twin density.
Aditya Srinivasan Tirunilai, Zeki Ayrildi, Buse Şen, Maik Rajkowski, Mathias Redondo Garcia, Markus Stricker, Guillaume Laplanche   +6 more
wiley   +1 more source

A Possible Explanation of W-type Phenomena in V694 Peg

The Astrophysical Journal
Three sets of complete multicolor light curves of V694 Peg observed in 2013, 2015, and 2019 were presented and analyzed. Our photometric solutions show that this system was an A-type shallow contact binary in 2013 and 2015 while it converted to a W-type ...
Hu-Shan Xu, Li-Ying Zhu
doaj   +1 more source

High‐Temperature Nanoindentation of Metals: Assessing Thermal Drift, Frame Compliance, and Chemical Composition Effects on the Reported Mechanical Properties

Advanced Engineering Materials, EarlyView.
Do not let thermal drift and instrument artifacts deceive high‐temperature nanoindentation results. We compare classical Oliver–Pharr and automatic image recognition analyses across steels and a Ni alloy to quantify these effects. Accounting for artifacts reveals systematic softening with temperature, while Cr and Ni additions boost resistance ...
Velislava Yonkova, Steffen Brinckmann, Ruth Schwaiger   +2 more
wiley   +1 more source

3D‐Printed Sulfur‐Derived Polymers With Controlled Architectures for Lithium‐Sulfur Batteries

Advanced Functional Materials, EarlyView.
Rheology‐guided formulation design for direct ink writing enables the fabrication of 3D sulfur copolymer cathodes with controlled architectures for lithium‐sulfur batteries. The printed electrodes exhibit multiscale porosity and high sulfur utilization, delivering enhanced electrochemical performance compared to conventional cast electrodes.
Bin Ling, Haoran Wang, Pan Yang, Rishav Agrawal, Alex R. Neale, Laurence J. Hardwick, Tom Hasell, Esther García‐Tuñón   +7 more
wiley   +1 more source

The Investigation of 84 TESS Totally Eclipsing Contact Binaries

The Astronomical Journal
Based on the eclipsing binary catalog provided by A. Prša et al., 84 totally eclipsing contact binaries with stable light curves were selected. The Transiting Exoplanet Survey Satellite light curves of these 84 targets were studied using the Physics Of ...
Yani Guo, Kai Li, Liheng Wang, Qiqi Xia, Xiang Gao, Jingran Xu, Jingyi Wang   +6 more
doaj   +1 more source