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Precision measurement of the beam pattern of an antenna is very important for many applications. While traditionally such measurement is often made in a microwave anechoic chamber or at a test range, measurement using an unmanned aerial…

天体物理仪器与方法 · 物理学 2021-12-14 Juyong Zhang , Jingxin Liu , Fengquan Wu , Xuelei Chen , Jixia Li , Peter T. Timbie , Santanu Das , Ruibin Yan , Jiachen He , Osinga Calvin

A series of observations of microquasar GRS1915+105 were made by the MERLIN telescope array in the spring of 2003 at 18 cm. The images show polarization in the jet components, with two epochs displaying Faraday rotation of about 2500…

天体物理学 · 物理学 2007-05-23 I. K. Brown

Exploring the nucleon's sea quark and gluon structure is a prime objective of a future electron-ion collider (EIC). Many of the key questions require accurate differential semi-inclusive (spin/flavor decomposition, orbital motion) and…

高能物理 - 唯象学 · 物理学 2009-08-17 T. Horn , P. Nadel-Turonski , C. Weiss

We discuss possibilities and improvements which could be obtained, if a phased array with a large number (N=50-100) of sub-millimeter antennas - like the planned large southern array (the former LSA, now ALMA) is used for…

天体物理学 · 物理学 2007-05-23 Thomas P. Krichbaum

The deep-learning based image matching networks can now handle significantly larger variations in viewpoints and illuminations while providing matched pairs of pixels with sub-pixel precision. These networks have been trained with…

计算机视觉与模式识别 · 计算机科学 2026-03-24 Rahul Deshmukh , Aditya Chauhan , Avinash Kak

Cornell, California Institute of Technology (Caltech), and Jet Propulsion Lab (JPL) have joined together to study development of a 25 meter sub-millimeter telescope (CCAT) on a high peak in the Atacama region of northern Chile, where the…

天体物理学 · 物理学 2016-03-02 Thomas A. Sebring , Riccardo Giovanelli , Simon Radford , Jonas Zmuidzinas

In an attempt to increase the number of known microquasars, Paredes et al. (2002) have presented a long-term project focused on the search for new objects of this type. They performed a cross-identification between X-ray and radio catalogs…

天体物理学 · 物理学 2007-05-23 M. Ribo , E. Ros , J. M. Paredes , M. Massi , J. Marti

I outline the prospects for performing weak lensing studies with the new generation of radio telescopes that are coming online now and in the future. I include a description of a proposed technique to use polarization observations in radio…

宇宙学与河外天体物理 · 物理学 2012-06-21 Michael L Brown

In recent years there has been a resurgence of interest in our community in the shape analysis of 3D objects represented by surface meshes, their voxelized interiors, or surface point clouds. In part, this interest has been stimulated by…

计算机视觉与模式识别 · 计算机科学 2021-12-01 Morteza Rezanejad , Mohammad Khodadad , Hamidreza Mahyar , Herve Lombaert , Michael Gruninger , Dirk B. Walther , Kaleem Siddiqi

Monitoring dietary intake is a crucial aspect of promoting healthy living. In recent years, advances in computer vision technology have facilitated dietary intake monitoring through the use of images and depth cameras. However, the current…

计算机视觉与模式识别 · 计算机科学 2024-05-15 Aaryam Sharma , Chris Czarnecki , Yuhao Chen , Pengcheng Xi , Linlin Xu , Alexander Wong

In a recent paper (Brown & Battye 2011), we proposed the use of integrated polarization measurements of background galaxies in radio weak gravitational lensing surveys and investigated the potential impact on the statistical measurement of…

宇宙学与河外天体物理 · 物理学 2015-05-27 Michael L. Brown , Richard A. Battye

In this work we use solar observations with the ALMA radio telescope at the wavelength of 1.21 mm. The aim of the analysis is to improve understanding of the solar chromosphere, a dynamic layer in the solar atmosphere between the…

太阳与恒星天体物理 · 物理学 2018-12-19 R. Brajša , D. Sudar , I. Skokic , A. O. Benz , M. Kuhar , A. Kobelski , S. Wedemeyer , S. M. White , H. -G. Ludwig , M. Temmer , S. H. Saar , C. L. Selhorst

The (sub)millimeter sky contains a vast wealth of information that is both complementary and inaccessible to other wavelengths. Over half the light we receive is observable at (sub)millimeter wavelengths, yet we have mapped only a small…

The Aitken method is a useful approach for decomposing mid-IR polarimetry of silicates in astronomical sources into emissive and absorptive components. Here we extend this method to include the effects of polarization caused by scattering…

天体物理仪器与方法 · 物理学 2025-11-25 Frank Városi , Charles M. Telesco , Christopher M. Wright , Sergio José Fernández Acosta

We present a graphical interface designed to demonstrate the techniques of radio interferometry used by telescopes like ALMA, e-Merlin, the JVLA and SKA, in a manner accessible to the general public. Interferometry is an observational tech-…

天体物理仪器与方法 · 物理学 2012-11-02 Adam Avison , Samuel J George

I report on the development of new code to support the Nasmyth and E-W antenna mount types in AIPS which will allow polarisation analysis of observations made using these uncommon antenna configurations. These mount types may become more…

天体物理仪器与方法 · 物理学 2009-10-12 Richard Dodson

We present the first results from the ALHAMBRA survey. ALHAMBRA will cover a relatively wide area (4 square degrees) using a purposely-designed set of 20 medium-band filters, down to an homogeneous magnitude limit AB~25 in most of them,…

Solar observations at sub-mm, mm and cm wavelengths offer a straightforward diagnostic of physical conditions in the solar atmosphere because they yield measurement of brightness temperature which, for optically thick features, equals…

太阳与恒星天体物理 · 物理学 2022-09-07 Costas Alissandrakis , Timothy Bastian , Roman Brajša

We (Pierre et al. 2003) have designed a medium deep large area X-ray survey with XMM - the XMM Large Scale Structure survey, XMM-LSS - with the scope of extending the cosmological tests attempted using ROSAT cluster samples to two redshift…

天体物理学 · 物理学 2019-08-14 S. Andreon , M. Pierre