Results 51 to 60 of about 207,397 (293)

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

Application of Time Transfer Function to McVittie Spacetime: Gravitational Time Delay and Secular Increase in Astronomical Unit

, 2011
We attempt to calculate the gravitational time delay in a time-dependent gravitational field, especially in McVittie spacetime, which can be considered as the spacetime around a gravitating body such as the Sun, embedded in the FLRW (Friedmann-Lema\^itre-
B. Mashhoon, B.C. Nolan, B.C. Nolan, C. Le Poncin-Lafitte, C. Lämmerzahl, C.W. Misner, E.V. Pitjeva, F. Felice de, F. Felice de, G. Järnefelt, G. Järnefelt, G. Krasinsky, G.C. McVittie, G.G. Nyambuya, H. Arakida, H. Arakida, H.P. Robertson, Hideyoshi Arakida, J.D. Anderson, J.L. Synge, L. Iorio, L. Iorio, M. Carrera, M.A.C. Perryman, M.H. Soffel, P. Teyssandier, S.A. Klioner, S.A. Klioner, S.G. Turyshev, S.M. Kopeikin, S.M. Kopeikin, T. Miura, V.A. Brumberg, W.T. Ni   +33 more
core   +1 more source

Astronomical and Astrological Terms in Ibn Ezra's Biblical Commentaries: A New Approach [PDF]

Culture and Cosmos, 2009
Abraham ibn Ezra (Tudela, 1089/1092-1164/1167) was the most important writer of scientific treatises in Hebrew in the twelfth century; prior to him and his predecessor, Abraham bar Hiyya (d. after 1136), Arabic was the only language of scientific knowledge among Jews.
openaire   +1 more source

Secular Increase of the Astronomical Unit: a Possible Explanation in Terms of the Total Angular-Momentum Conservation Law [PDF]

Publications of the Astronomical Society of Japan, 2009
Abstract We give an idea and order-of-magnitude estimations to explain a recently reported secular increase of the Astronomical Unit ($AU$) by Krasinsky and Brumberg (2004, Celest. Mech. Dyn. Astron., 90, 267). The idea proposed is analogous to tidal acceleration in the Earth–Moon system, which is based on conservation of the total ...
Miura, Takaho, Arakida, Hideyoshi, Kasai, Masumi, Kuramata, Shuichi   +3 more
openaire   +2 more sources

Multipurpose Transparent Nanocomposites for Gamma Spectroscopy, Pulse Shape Discrimination, Thermal Neutron Detection, Radiation Shielding, and High Refractive Index Applications

Advanced Functional Materials, EarlyView.
Materials exist that are useful for gamma scintillation, radiation shielding, neutron‐gamma pulse shape discrimination (PSD), thermal neutron detection, or high refractive index applications. While certain materials have exhibited optimal performance for each of these applications, none achieve multiple functions.
Isabelle Winardi, Stephane Miaule, Robert Carmichael, Bowen Sun, Ziqing Han, Prabhav Surabhi, Zhen Luo, Noelan Hum, David Prout, Yi‐An Chen, Ting‐Hsuan Wu, Hao Yu, Arion Chatziioannou, Qibing Pei   +13 more
wiley   +1 more source

A Brief Review of Unsupervised Machine Learning Algorithms in Astronomy: Dimensionality Reduction and Clustering

Universe
This review investigates the application of unsupervised machine learning algorithms to astronomical data. Unsupervised machine learning enables researchers to analyze large, high-dimensional, and unlabeled datasets and is sometimes considered more ...
Chih-Ting Kuo, Duo Xu, Rachel Friesen
doaj   +1 more source

Estimation of Reliability Function for Complete Data - Article Review [PDF]

المجلة العراقية للعلوم الاحصائية, 2019
The theory of reliability is one of the important theories that is attracting great interest in many researchers at present because of its importance in various fields of life especially in determining the age of a particular device and its efficiency ...
Shaimaa Waleed
doaj   +1 more source

Harnessing the Orientation of Columnar Discotic Liquid Crystals for Narrowband Blue Emission with Enhanced Out‐Coupling Efficiency Toward Improvement of SP‐OLEDs Performance

Advanced Functional Materials, EarlyView.
Solution‐processed OLEDs containing discotic liquid‐crystalline MR‐TADF emitters are reported. Supramolecular self‐assembly induces homeotropic columnar alignment, enforcing preferential horizontal orientation of the emitter transition dipole moment in spin‐coated films, which leads to an enhancement in the device light outcoupling efficiency while ...
Joydip De, Abhishek Kumar Gupta, Džiugas Litvinas, Francisco Tenopala‐Carmona, Matthias Lehmann, Malte C. Gather, Eli Zysman‐Colman   +6 more
wiley   +1 more source

The Analysis of the Relation between virgo and leo in a Verse of Nezami [PDF]

متن شناسی ادب فارسی, 2013
Nezami Ganjavi is one of the famous figures of Persian poetry whose poetry has been considered to need commentary and interpretation for a long time. One of the reasons of complexity in his poems is the precise usage of astronomical terms and imagery ...
a Heydari
doaj  

Photometry of two unusual A supergiant systems in the Small Magellanic Cloud

, 2010
We present multiwavelength broadband photometry and V, I time resolved photometry for two variable bright stars in the SMC, OGLE004336.91-732637.7 (SMC-SC3) and OGLE004633.76-731204.3 (SMC-SC4).
Kołaczkowski, Z., Mennickent, R. E., Pietrzyński, G., Smith, M., Soszyński, I.   +4 more
core   +1 more source