Results 91 to 100 of about 6,767,247 (161)

Calibration of silicon drift detector response to monochromatic X-rays [PDF]

open access: yesNuclear Technology and Radiation Protection
Silicon drift detectors are the core sensors for next-generation space-based X-ray detection, where precise efficiency calibration is crucial for both astronomical observation and radiation monitoring.
Li Wen   +6 more
doaj   +1 more source

So What IS the Astronomy Major? [PDF]

open access: yes, 2002
We present a statistical description of the astronomy major as it is offered in U.S. colleges and universities. There is substantial variation from institution to institution, but the physics requirements for the astronomy major are more uniform than the
Partridge, Bruce   +2 more
core  

In-field Phasing at the Upgraded GMRT

open access: yesThe Astrophysical Journal
In time-domain radio astronomy with arrays, voltages from individual antennas are added together with proper delay and fringe correction to form the beam in real time.
Sanjay Kudale   +4 more
doaj   +1 more source

A Decade of Transit-timing Measurements Confirm Resonance in the K2-19 System

open access: yesThe Astronomical Journal
K2-19 is a star, slightly smaller than the Sun, that hosts three transiting planets. Two of these, K2-19 b and c, are between the size of Neptune and Saturn and have orbital periods near a 3:2 commensurability, and exhibit strong transit-timing ...
Paige M. Entrican   +4 more
doaj   +1 more source

A critical evaluation of the new Hall of Astronomy of the University of Mexico Science Museum

open access: yes, 2008
On December 2004, the newly designed astronomy hall at Universum, the science museum of the Universidad Nacional Autonoma de Mexico, was opened to the public.
Doddoli, Consuelo   +1 more
core  

Mapping the Orbital Landscape of Perturbing Planet Solutions for Single-planet Systems with TTVs

open access: yesThe Astrophysical Journal
There are now thousands of single-planet systems observed to exhibit transit timing variations (TTVs), yet we largely lack any interpretation of the implied masses responsible for these perturbations.
Daniel A. Yahalomi, David Kipping
doaj   +1 more source

An Autoregressive Moving Average Model for Time Series with Irregular Time Intervals

open access: yesComputer Sciences & Mathematics Forum
This research focuses on the study of stochastic processes with irregularly spaced time intervals, which is present in a wide range of fields such as climatology, astronomy, medicine, and economics.
Diana Alejandra Godoy Pulecio   +1 more
doaj   +1 more source

Orbital Decay of the Ultra-hot Jupiter TOI-2109b: Tidal Constraints and Transit-timing Analysis

open access: yesThe Astrophysical Journal
TOI-2109b is the ultra-hot Jupiter with the shortest orbital period (∼16 hr) yet discovered. At this close distance, strong tidal interactions can produce a significant exchange of angular momentum with the star.
Jaime A. Alvarado-Montes   +3 more
doaj   +1 more source

The 1948 solar eclipse and the genesis of radio astronomy in Victoria [PDF]

open access: yes, 2004
In the early years of radio astronomy, solar eclipses played a critical role in establishing the sources of solar radio emission. During the half decade from 1945, Australia emerged as a leading nation in radio astronomy, with most of the observations ...
Orchiston, Wayne
core   +1 more source

Strengthening properties of glass-ceramics with near-zero thermal expansion

open access: yesMaterials & Design
The hydrogen atomic clock microwave cavity serves as the interaction site between electromagnetic fields and hydrogen atoms, requiring materials with low coefficient of thermal expansion, high temperature variation resistance, and superior mechanical ...
Shengyun Yang   +9 more
doaj   +1 more source

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