Results 61 to 70 of about 1,249,922 (287)

Efficient Astronomical Data Condensation Using Approximate Nearest Neighbors

International Journal of Applied Mathematics and Computer Science, 2019
Extracting useful information from astronomical observations represents one of the most challenging tasks of data exploration. This is largely due to the volume of the data acquired using advanced observational tools.
Łukasik Szymon, Lalik Konrad, Sarna Piotr, Kowalski Piotr A., Charytanowicz Małgorzata, Kulczycki Piotr   +5 more
doaj   +1 more source

A Recipe for Unbiased Background Modeling in Deep Wide-field Astronomical Images

The Astrophysical Journal, 2023
Unbiased sky background modeling is crucial for the analysis of deep wide-field images, but it remains a major challenge in low surface brightness astronomy.
Qing Liu, Roberto Abraham, Peter G. Martin, William P. Bowman, Pieter van Dokkum, Steven R. Janssens, Seery Chen, Michael A. Keim, Deborah Lokhorst, Imad Pasha, Zili Shen, Jielai Zhang   +11 more
doaj   +1 more source

Accreting Black Holes

, 2019
This chapter provides a general overview of the theory and observations of black holes in the Universe and on their interpretation. We briefly review the black hole classes, accretion disk models, spectral state classification, the AGN classification ...
A Heger, A Heger, A Ingram, A Lohfink, A Marinucci, A Tchekhovskoy, A Tchekhovskoy, A Zoghbi, AC Fabian, AC Fabian, AC Fabian, AK Kulkarni, AL King, AM El-Batal, AM Ghez, AM Lohfink, AR King, AR King, AR King, AR Patrick, BP Abbott, BR McNamara, C Nipoti, CE Rhoades, CM Urry, CS Reynolds, CY Chiang, DJ Walton, DJ Walton, DJ Walton, DJ Walton, DL Meier, DM Russell, DN Page, DR Pasham, E Agol, E Berti, E Gallo, E Maoz, E Nardini, EJM Colbert, F Haardt, F Haardt, FX Timmes, G Ghisellini, G Lodato, G Miniutti, G Risaliti, H Bondi, H Falcke, I Shlosman, IF Mirabel, J Casares, J Garcia, J Garcia, J Homan, J Kormendy, J Singal, JA Garcia, JA Tomsick, JA Zensus, JE Barnes, JE McClintock, JE McClintock, JE McClintock, JF Steiner, JF Steiner, JF Steiner, JF Steiner, JF Steiner, JF Steiner, JM Bardeen, JM Lattimer, JM Miller, JM Miller, JM Miller, JM Wang, K Akiyama, K Belczynski, K Gebhardt, K Gebhardt, K Mitsuda, K Ohsuga, KS Thorne, L Brenneman, L Ferrarese, L Gou, L Gou, L Gou, L Gou, L Mayer, L Stella, LC Gallo, LW Brenneman, LW Brenneman, LW Brenneman, LX Li, M Gierlinski, M Jaroszynski, M Kolehmainen, M Middleton, M Postman, M Sikora, M Volonteri, M Volonteri, M Volonteri, M Volonteri, MA Abramowicz, MA Abramowicz, MA Abramowicz, MA Abramowicz, MA Abramowicz, MA Abramowicz, MJ Reid, ML Parker, ML Parker, ML Parker, N White, NI Shakura, P Madau, PC Fragile, PD Kiel, R Fender, R Narayan, R Narayan, R Narayan, R Shafee, RA Remillard, RA Sunyaev, RA Sunyaev, RC Reis, RC Reis, RC Reis, RC Reis, RC Reis, RD Blandford, RD Blandford, RF Penna, RG Martin, RG Martin, RP Fender, RV Vasudevan, S Kumar, S Sun, SA Hughes, SC Yoon, SE Motta, SE Motta, SE Woosley, SL Shapiro, SN Zhang, T Dauser, T Fragos, T Fragos, TM Belloni, V Kalogera, VV Zhuravlev, WM Farr, Y Tan, Y Xu   +159 more
core   +1 more source

When Poor Exciton Dissociation Limits Photocurrents in Organic Solar Cells: Why Low Offset Non‐Fullerene Acceptor Blends Can't Be Efficient

Advanced Materials, EarlyView.
The energetic offset between the donor and the acceptor components in organic photoactive layers is central to the tradeoff between photovoltage and photocurrent losses. This Perspective covers the most important issues surrounding this topic in non‐fullerene acceptor blends, from the difficulty of accurately determining state energies and driving ...
Dieter Neher, Manasi Pranav
wiley   +1 more source

Scalable Solutions for Automated Single Pulse Identification and Classification in Radio Astronomy

, 2018
Data collection for scientific applications is increasing exponentially and is forecasted to soon reach peta- and exabyte scales. Applications which process and analyze scientific data must be scalable and focus on execution performance to keep pace.
Bertram Ludäscher, Brian, Junfei Qiu, Matei   +3 more
core   +1 more source

Versatile Magneto‐Dielectric Response of Epitaxial Thin Films of the High Entropy Oxide Perovskite Nd(Cr0.2Mn0.2Fe0.2Co0.2Ni0.2)O3

Advanced Materials, EarlyView.
The magnetic high entropy oxide perovskite Nd(Cr0.2Mn0.2Fe0.2Co0.2Ni0.2)O3 exhibits a substantially large dielectric constant (εr) at room temperature, which shows distinct anionic and cationic contributions in the form of zero and finite bias peaks, respectively, down to its magnetic transition temperature (Tmag).
Roxana Capu, Ryan Thompson, C. Willem Rischau, Marli R. Cantarino, Premysl Marsik, Sergey L. Bud'ko, Neven Biškup, María Varela, Yurii G. Pashkevich, Serhii M. Orel, Thomas Prokscha, Andreas Suter, Jiangtao Zhao, Ugwumsinachi Oji, Marco Bonura, Peter Bencok, Zaher Salman, Stefano Gariglio, Christian Bernhard, Subhrangsu Sarkar   +19 more
wiley   +1 more source

Unfolding X-Ray Spectral Data: Conditions and Applications

The Astronomical Journal
We present conditions for which X-ray spectra can be “unfolded” to present an accurate representation of the true source spectra. The method we use to unfold the data is implemented in the Interactive Spectral Interpretation Software and distinguishes ...
Sean J. Gunderson, David P. Huenemoerder
doaj   +1 more source

Spin‐Orbit Torque Induced by Switchable Crystal Inversion Symmetry Breaking

Advanced Materials, EarlyView.
An exotic crystal inversion symmetry breaking in SrRuO3/BiFeO3 heterostructure is revealed, and it can be reversibly manipulated by the ferroelectric polarization of BiFeO3. This crystal inversion symmetry breaking can dramatically enhance the spin‐orbit torque efficiency in the SrRuO3 layer by more than 60%, providing an alternative to design an ...
Zhenyi Zheng, Shu Shi, Zhongran Liu, Qihan Zhang, Naafis Ahnaf Shahed, Himanshu Mavani, Guowei Zhou, Qian Chen, Cheng Zhang, Zhanqi Zhou, Tieyang Zhao, Rui Xiao, Lanxin Jia, Liang Liu, Evgeny Y. Tsymbal, Xiaohong Xu, He Tian, Jingsheng Chen   +17 more
wiley   +1 more source

Photocatalytic Water Splitting on the Lunar Surface: Prospects for In Situ Resource Utilization

Advanced Materials Interfaces, EarlyView.
Water has been found in craters on the moon nearby locations which are illuminated >80% of the time. Photocatalysis uses energy from sunlight to drive chemical reactions such as water splitting to produce oxygen and hydrogen. It is a scalable technology that requires lighter equipment and utilizes resources available on the moon. ABSTRACT The discovery
Ranjani Kalyan, Thomas D. Small, Gregory F. Metha, Mahmoud Adel Hamza, Thomas J. O'Dea, Yideng Shen, Cameron J. Shearer   +6 more
wiley   +1 more source

The MDW Hα Sky Survey: Data Release 1

The Astronomical Journal
The Mittelman–di Cicco–Walker (MDW) H α Sky Survey is an autonomously operated all-sky narrowband (3 nm) H α imaging survey. The survey was founded by amateur astronomers, and the northern sky (decl.
Noor Aftab, Xunhe (Andrew) Zhang, Sean Walker, Dennis di Cicco, David R. Mittelman, Sanya Gupta, Andrew K. Saydjari, Mary Putman, David Schiminovich   +8 more
doaj   +1 more source