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Since the mass of the electron is very small relative to atomic masses, Thomson scattering of low-energy photons ($h\nu \ll m_ec^2$) produces thermal Doppler frequency shifts that are much larger than atomic Doppler widths. A method is…

天体物理学 · 物理学 2011-05-23 G. B. Rybicki , D. G. Hummer

The Atom portal, udel.edu/atom, provides the scientific community with easily accessible high-quality data about properties of atoms and ions, such as energies, transition matrix elements, transition rates, radiative lifetimes, branching…

Comprehension of metabolic pathways is considerably enhanced by metabolic flux analysis (MFA-ILE) in isotope labeling experiments. The balance equations are given by hundreds of algebraic (stationary MFA) or ordinary differential equations…

分子网络 · 定量生物学 2016-03-24 Stéphane Mottelet , Gil Gaullier , Georges Sadaka

The ALMA SPECtroscopic Survey in the {\it Hubble} Ultra Deep Field is an ALMA large program that obtained a frequency scan in the 3\,mm band to detect emission lines from the molecular gas in distant galaxies. We here present our search…

We have undertaken a major enhancement of our IDL-based simulation tools developed earlier for modeling microwave and X-ray emission. The object-based architecture provides an interactive graphical user interface that allows the user to…

太阳与恒星天体物理 · 物理学 2015-06-22 Gelu M. Nita , Gregory D. Fleishman , Alexey A. Kuznetsov , Eduard P. Kontar , Dale E. Gary

To generate data from trained diffusion models, most inference algorithms, such as DDPM, DDIM, and other variants, rely on discretizing the reverse SDEs or their equivalent ODEs. In this paper, we view such approaches as decomposing the…

机器学习 · 统计学 2024-05-28 Xunpeng Huang , Difan Zou , Hanze Dong , Yi Zhang , Yi-An Ma , Tong Zhang

Proton radiography is used in various high-energy-density (HED) plasma experiments. In this paper, we describe a Monte Carlo and ray-tracing simulation tool called MPRAD that can be used for modeling the deflection of proton beams in…

等离子体物理 · 物理学 2020-01-08 Yingchao Lu , Hui Li , Kirk A. Flippo , Kwyntero Kelso , Andy Liao , Shengtai Li , Edison Liang

Advanced millimeter-wave software-defined array (SDA) platforms, or testbeds at affordable costs and high performance are essential for the wireless community. In this paper, we present a low-cost, portable, and programmable SDA that allows…

系统与控制 · 电气工程与系统科学 2024-09-19 Ashwini Pondeycherry Ganesh , Anthony Perre , Alphan Sahin , Ismail Guvenc , Brian A. Floyd

This paper is part of the Prelaunch status LFI papers published on JINST (http://www.iop.org/EJ/journal/-page=extra.proc5/1748-0221). Planck's Low Frequency Instrument is an array of 22 pseudo-correlation radiometers at 30, 44, and 70 GHz.…

Over the next decade, observations conducted with ALMA and the SKA will reveal the process of mass assembly and accretion onto young stars and will be revolutionary for studies of star formation. Here we summarise the capabilities of ALMA…

星系天体物理 · 物理学 2015-04-15 G. A. Fuller , J. Forbrich , J. M. Rathborne , S. Longmore , S. Molinari

(abridged) The Atacama Large Millimeter/submillimeter Array (ALMA) was the top-ranked priority for a new ground-based facility in the 2000 Canadian Long Range Plan. Ten years later, at the time of LRP2010, ALMA construction was well…

Molecular-scale diodes made from self-assembled monolayers (SAMs) could complement silicon-based technologies with smaller, cheaper, and more versatile devices. However, advancement of this emerging technology is limited by insufficient…

Heterodyne receivers register the sky signal on either a circular polarization basis (where it is split into left-hand and right-hand circular polarization) or a linear polarization basis (where it is split into horizontal and vertical…

天体物理仪器与方法 · 物理学 2016-03-09 Ivan Marti-Vidal , Alan Roy , John Conway , Anton J. Zensus

We describe the atomic database of the XSTAR spectral modeling code, summarizing the systematic upgrades carried out in the past twenty years to enable the modeling of K lines from chemical elements with atomic number $Z\leq 30$ and recent…

We describe a simple automated method to extract and quantify transient heterogeneous dynamical changes from large datasets generated in single molecule/particle tracking experiments. Based on wavelet transform, the method transforms raw…

数据分析、统计与概率 · 物理学 2013-06-04 Kejia Chen , Bo Wang , Juan Guan , Steve Granick

Resonant lines are powerful probes of the interstellar and circumgalactic medium of galaxies. Their transfer in gas being a complex process, the interpretation of their observational signatures, either in absorption or in emission, is often…

星系天体物理 · 物理学 2020-04-01 Leo Michel-Dansac , Jeremy Blaizot , Thibault Garel , Anne Verhamme , Taysun Kimm , Maxime Trebitsch

Full 3D inversion of time-domain Airborne ElectroMagnetic (AEM) data requires specialists' expertise and a tremendous amount of computational resources, not readily available to everyone. Consequently, quasi-2D/3D inversion methods are…

地球物理 · 物理学 2022-11-18 Wouter Deleersnyder , David Dudal , Thomas Hermans

Raman spectroscopy is a well established tool for the analysis of vibration spectra, which then allow for the determination of individual substances in a chemical sample, or for their phase transitions. In the…

数值分析 · 数学 2020-07-15 Konstantin Fackeldey , Jonas Röhm , Amir Niknejad , Surahit Chewle , Marcus Weber

A diverse array of science goals require accurate flux calibration of observations with the Atacama Large Millimeter/Submillimeter array (ALMA), however, this goal remains challenging due to the stochastic time-variability of the ``grid''…

天体物理仪器与方法 · 物理学 2020-11-25 Logan Francis , Doug Johnstone , Gregory Herczeg , Todd R. Hunter , Daniel Harsono