Results 61 to 70 of about 368,263 (301)

Diurnal and Seasonal Variations in Mid-Latitude Geomagnetic Field During International Quiet Days: BOH Magnetometer [PDF]

Journal of Astronomy and Space Sciences, 2012
Korea Astronomy and Space Science Institute researchers have installed and operated magnetometers at Bohyunsan Observatory to measure the Earth's magnetic field variations in South Korea.
Junga Hwang, Hyang-Pyo Kim, Young-Deuk Park   +2 more
doaj   +1 more source

A planetary companion around the K giant eps Corona Borealis

, 2012
Aims. Our aim is to search for and study the origin of the low-amplitude and long-periodic radial velocity (RV) variations in K giants. Methods. We present high-resolution RV measurements of K2 giant epsilon CrB from February 2005 to January 2012 using ...
B.-C. Lee, Bertelli, D. E. Mkrtichian, da Silva, de Medeiros, Donati, Döllinger, Döllinger, Fischer, Frink, Gettel, Ghezzi, Girardi, Glazunova, Han, Han, Hatzes, Hatzes, Hatzes, Hekker, I. Han, Ida, Johnson, Johnson, Johnson, Johnson, Jørgensen, K.-M. Kim, Kim, Kürster, Lee, Lomb, Lovis, M.-G. Park, Massarotti, Mitchell, Moutou, Niedzielski, Pasquini, Pasquini, Piskunov, Quirrenbach, Reffert, Reiners, Richichi, Saar, Santos, Sato, Sato, Sato, Scargle, Setiawan, Setiawan, Shaya, Sozzetti, Takeda, Tody, Wittenmyer   +57 more
core   +1 more source

A Different Perspective on the Solid Lubrication Performance of Black Phosphorous: Friend or Foe?

Advanced Engineering Materials, EarlyView.
Researchers investigate black phosphorous (BP) as a standalone solid lubricant coating through ball‐on‐disc linear‐reciprocating sliding experiments in dry conditions. Testing on different metals shows BP doesn't universally reduce friction and wear. However, it achieves 33% friction reduction on rougher iron surfaces and 23% wear reduction on aluminum.
Matteo Vezzelli, Manel Rodríguez Ripoll, Sabine Schwarz, Ali Erdemir, Maria Clelia Righi, Carsten Gachot   +5 more
wiley   +1 more source

Constraints on time variation of fine structure constant from WMAP-3yr data

, 2007
This paper presents the constraints on the time variation of the fine structure constant at recombination relative to its present value, Delta_alpha = (alpha_rec-alpha_0) / alpha_0, obtained from the analysis of the WMAP-3yr Cosmic Microwave Background ...
Stefanescu, Petruta
core   +1 more source

On the Rigidity and Mechanical Behavior of Triply Periodic Minimal Surfaces‐Based Lattices: Insights from Extensive Experiments and Simulations

Advanced Engineering Materials, EarlyView.
This study examines the mechanical properties of triply periodic minimal surfaces (TPMS)‐based lattices, analyzing 36 architectures in elastic and plastic regimes. It evaluates the applicability of beam‐based scaling laws to TPMS lattices. Rigidity arises from the alignment of members with the load direction and solid regions preventing rotation.
Lucía Doyle, Humberto Terrones, Carlos González   +2 more
wiley   +1 more source

Statistics of Ionospheric Storms Using GPS TEC Measurements Between 2002 and 2014 in Jeju, Korea [PDF]

Journal of Astronomy and Space Sciences, 2015
Using the Total Electron Content (TEC) data from the Global Navigation Service System (GNSS) site in Jeju, operated by the Korea Astronomy and Space Science Institute (geographic location: 33.3° N, 126.5° E; geomagnetic location: 23.6° N) for 2002 ...
Jong-Kyun Chung, Byung-Kyu Choi
doaj   +1 more source

Circular Polarization in Pulsar Integrated Profiles: Updates

, 2006
We update the systematic studies of circular polarization in integrated pulse profiles by Han et al (1998). Data of circular polarization profiles are compiled.
Biggs J D, Crawford F, Gil J A, Gould D M, Hamilton P A, Han J L, Jin-lin Han, Kramer M, Kramer M, Lommen A N, Lyne A G, Macquart J P, Manchester R N, Manchester R N, McCulloch P M, Melrose D, Navarro J, Petrova S A, Qiao G J, Qiao G J, Radhakrishnan V, Roberts M S E, Stairs I H, van Ommen T D, von Hoensbroech A, von Hoensbroech A, Weisberg J M, Weisberg J M, Xiao-Peng You, Xilouris K M, Xu R X   +30 more
core   +1 more source

The metal-rich globular clusters of the Milky Way [PDF]

, 1999
We present new (V,V-I)-photometry of the metal-rich globular clusters NGC 5927, 6316, 6342, 6441 and 6760. The clusters show differential reddening up to dE(V-I)=0.32 mag, for which the CMDs are corrected via extinction maps.
Heitsch, F., Richtler, T.
core   +4 more sources

Universal Superconductivity in FeTe and All‐Iron‐Based Ferromagnetic Superconductor Heterostructures

Advanced Functional Materials, EarlyView.
The first all‐iron‐based ferromagnetic superconductor heterostructures with high‐temperature superconductivity and strong ferromagnetism aredemonstrated. From this, it is discovered that FeTe becomes universallysuperconducting with a minute level of cationic impurities through doping ordiffusion from neighboring layers, suggesting its ground state can ...
Hee Taek Yi, Xiong Yao, Deepti Jain, Ying‐Ting Chan, An‐Hsi Chen, Matthew Brahlek, Kim Kisslinger, Kai Du, Myung‐Geun Han, Yimei Zhu, Weida Wu, Sang‐Wook Cheong, Seongshik Oh   +12 more
wiley   +1 more source

Integrated Study of X-Ray Spectrum and Time Lags for HBL Mrk 421 within the Framework of the Multiple-zone Leptonic Model

The Astrophysical Journal
We present the timing analysis of 10 archived XMM-Newton observations with an exposure of >40 ks of Markarian 421. Mrk 421 is the brightest high-frequency-peaked BL Lac object emitting in X-rays produced by electrons accelerated in the innermost regions ...
Wen Hu, Jia-Lai Kang, Zhen-Yi Cai, Jun-Xian Wang, Zhen-Bo Su, Guang-Cheng Xiao   +5 more
doaj   +1 more source