Explanipedia

Optimizing the throughput of the ATLAS Geant4 detector simulation Open

Benjamin J. Morgan, John Apostolakis, Marilena Bandieramonte, J. D. Chapman, Michael Duehrssen-Debling , et al. · 2025

For Run 3 at the Large Hadron Collider the Monte Carlo Detector Simulation performed with Geant4 (Full Simulation) within the ATLAS experiment has undergone significant improvements to enhance its computational performance and overall effi…

AtlFast3: Fast Simulation in ATLAS for LHC Run 3 and Beyond Open

Federico Andrea Corchia, M. Bandieramonte, J. F. Beirer, J. D. Chapman, Michael Duehrssen-Debling , et al. · 2025

As we are approaching the high-luminosity era of the LHC, the computational requirements of the ATLAS experiment are expected to increase significantly in the coming years. Notably, simulation of Monte Carlo (MC) events is immensely comput…

Faster simulated track reconstruction in the ATLAS Fast Chain Open

W. A. Leight, M. Javurkova, F. Tsai, D. Sengupta, T. Golling , et al. · 2024

The production of simulated datasets for use by physics analyses consumes a large fraction of ATLAS computing resources, a problem that will only get worse as increases in the instantaneous luminosity provided by the LHC lead to more colli…

Estimating the Primary Care Workforce for Medicare Beneficiaries Using an Activity-Based Approach Open

Monica O’Reilly-Jacob, J. D. Chapman, V.S. Senthil Kumar, Jennifer Perloff · 2023

Place and Time at Trypillia Mega-Sites: Towards a New Synthesis of Analyses and Social Theory - Appendices Open

Bisserka Gaydarska, Andrew Millard, Brian Buchanan, J. D. Chapman · 2023

The Trypillia mega-sites (‘TMS’) form an exceptional aspect of the broader Cucuteni–Trypillia group in the Balkan and East European Neolithic and Chalcolithic. The TMS are currently the largest sites and the earliest urban complexes in Eur…

Place and Time at Trypillia Mega-Sites: Towards a New Synthesis of Analyses and Social Theory - Appendices Open

Bisserka Gaydarska, Andrew Millard, Brian Buchanan, J. D. Chapman · 2023

The Trypillia mega-sites (‘TMS’) form an exceptional aspect of the broader Cucuteni–Trypillia group in the Balkan and East European Neolithic and Chalcolithic. The TMS are currently the largest sites and the earliest urban complexes in Eur…

Mapping methane and carbon dioxide point sources from space with EMIT Open

Andrew K. Thorpe, Robert Green, David R. Thompson, Philip G. Brodrick, J. D. Chapman , et al. · 2023

Carbon dioxide and methane are the two primary anthropogenic climate-forcing agents and are the dominant source of uncertainty in the global carbon budget. We present the first observations of methane and carbon dioxide point source plumes…

Influence of directional wave spreading on a WEC device Open

Emilio Faraggiana, J. D. Chapman, Ian Brent Masters · 2022

Wave Energy Converter (WEC) performance is generally sensitive to the wave direction. So, it is important to include the effect of multi-directional waves in numerical modelling. A realistic representation of ocean waves should account for…

Legacies of the Tohoku Earthquake and Tsunami Impacting the Northern California Current in the Eastern North Pacific Ocean Open

Richard D. Brodeur, Jessica A. Miller, J. D. Chapman, Gayle I. Hansen, Delvan Neville · 2021

5 The Finds Open

Bisserka Gaydarska, Marco Nebbia, J. D. Chapman, Edward Caswell, Sophia Arbeiter , et al. · 2020

The FindsIn this chapter, we present comparative analyses of artifacts and ecofacts from most of the Project excavations at Nebelivka (House A9, the Mega-structure, the Pit in Sondazh 1 and the test pits).The finds from the Ukrainian excav…

1 Introduction Open

Bisserka Gaydarska, J. D. Chapman · 2020

In the first chapter, we introduce readers to the world of Central and East European prehistory and, in particular, the Cucuteni-Trypillia group, which covered up to 250,000km 2 and lasted over two millennia.This group was one of the large…

7 Conclusions Open

J. D. Chapman, Bisserka Gaydarska · 2020

ConclusionsIn the final chapter, we present the twelve principal conclusions of the monograph, discussing the major implications of each finding for Trypillia megasite archaeology.We then move away from a traditional account of our Project…

4 Site Studies Open

Bruce Albert, James B. Innés, K. V. Kremenetski, Andrew Millard, Marco Nebbia , et al. · 2020

In this chapter, we draw together and integrate the studies relating to the Nebelivka megasite at the site level. Three sources of palaeo-environmental evidence – pollen analysis, soil micro-morphology and molluscan analysis – are used to …

Computational modelling and experimental tank testing of the multi float WaveSub under regular wave forcing Open

Emilio Faraggiana, C. Whitlam, J. D. Chapman, Andrew Hillis, Jens Roesner , et al. · 2020

Multi-threaded simulation for ATLAS: challenges and validation strategy Open

M. Bandieramonte, J. D. Chapman, Justin Chiu, H. M. Gray, M. Muškinja · 2020

Estimations of the CPU resources that will be needed to produce simulated data for the future runs of the ATLAS experiment at the LHC, indicate a compelling need to speed-up the process to reduce the computational time required. While diff…

Geant4 performance optimization in the ATLAS experiment Open

M. Muškinja, J. D. Chapman, H. M. Gray · 2020

Software improvements in the ATLAS Geant4-based simulation are critical to keep up with evolving hardware and increasing luminosity. Geant4 simulation currently accounts for about 50% of CPU consumption in ATLAS and it is expected to remai…

Fast simulation methods in ATLAS: from classical to generative models Open

J. D. Chapman, K. Cranmer, S. Gadatsch, T. Golling, A. Ghosh , et al. · 2020

The ATLAS physics program relies on very large samples of G eant 4 simulated events, which provide a highly detailed and accurate simulation of the ATLAS detector. However, this accuracy comes with a high price in CPU, and the sensitivity …

A roadmap for HEP software and computing R&D for the 2020s Open

J. Albrecht, A. A. Alves, G. Amádio, Giuseppe Andronico, Nguyen Anh-Ky , et al. · 2019

Development of a Slab-based Monte Carlo Proton Dose Algorithm with a Robust Material-dependent Nuclear Halo Model Open

J. D. Chapman · 2018

Pencil beam algorithms (PBAs) are often utilized for dose calculation in proton therapy treatment planning because they are fast and accurate under most conditions. However, as discussed in Chapman et al (2017), the accuracy of a PBA can b…

HEP Software Foundation Community White Paper Working Group - Detector Simulation Open

J. Apostolakis, Benjamin Nachman, G. Corti, A. L. Lyon, D. S. Lemos , et al. · 2018

A working group on detector simulation was formed as part of the high-energy physics (HEP) Software Foundation's initiative to prepare a Community White Paper that describes the main software challenges and opportunities to be faced in the…

The Western Pacific barred knifejaw, Oplegnathus fasciatus (Temminck & Schlegel, 1844) (Pisces: Oplegnathidae), arriving with tsunami debris on the Pacific coast of North America Open

Nicholas Ta, Jessica A. Miller, J. D. Chapman, Allen Pleus, Thomas P. Calvanese , et al. · 2018

The Western Pacific Ocean barred knifejaw Oplegnathus fasciatus was found from 2013 to 2015 along the Pacific Coast of North

<b>Use of captive spray ionization to increase throughput of the data‐independent acquisition technique PAcIFIC</b> Open

J. D. Chapman, J. Scott Edgar, David R. Goodlett, Young Ah Goo · 2016

Rationale The P recursor Ac quisition I ndependent F rom I on C ount (PAcIFIC) method is a data‐independent acquisition technique capable of identifying proteins over eight orders of magnitude in a single analysis in human plasma. Widespre…

RETRACTION: All-Trans-Retinoic Acid Enhances Mitochondrial Function in Models of Human Liver Open

Sasmita Tripathy, J. D. Chapman, Chang Y Han, Cathryn A. Hogarth, Samuel L.M. Arnold , et al. · 2016

ATLAS Monte Carlo production Run-1 experience and readiness for Run-2 challenges Open

J. D. Chapman, J. E. García Navarro, V. Tsulaia, C. Gwenlan, S. Mehlhase , et al. · 2015

In this presentation we will review the ATLAS Monte Carlo production setup including the different production steps involved in full and fast detector simulation. A report on the Monte Carlo production campaigns during Run-I, Long Shutdown…

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