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Search indexed NASA NTRS and DOE OSTI research on propulsion, heat transfer, battery materials and energy systems. Follow report and document links to the original sources.

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At least 55 records · Page 3
All sourcesNASA NTRSDOE OSTI
DOE OSTI2020

The Road to Trinity: Seventy-five years ago, Los Alamos scientists detonated the world’s first nuclear explosion

With a brilliant hot flash and a loud boom, the giant mushroom cloud with its fiery core filled the predawn sky above the New Mexico desert. The nuclear age had begun. It was 75 years ago on July 16, 1945, that Los Alamos scientists changed the world with the successful detonation of “the Gadget” – the device created to test the Fat Man implosion-type plutonium weapon before it was taken into combat. However, the road to Trinity, as the test was named by J. Robert Oppenheimer, who is thought to have been inspired by a line in a John Donne poem, was a difficult one.

45 MILITARY TECHNOLOGY, WEAPONRY, AND NATIONAL DEF↗
DOE OSTI2020

Test your Trinity knowledge, print a 75th anniversary poster

To commemorate the 75th anniversary of the Trinity test, award-winning artist and graphic designer Paul Ziomek (Communication Arts and Services, CPA-CAS), illustrated an original poster. This one-of-a-kind work of art features Los Alamos Physicist Enrico Fermi witnessing the world’s first detonation of a nuclear device, the Gadget, on July, 16, 1945. This moment marked one of the greatest scientific achievements of all time and the dawn of the nuclear age. The work of those Los Alamos scientists – documented in their notebooks, photos, films, engineering drawings, and memos to each other – is part of the collections in the National Security Research Center, the Lab’s classified library located in the National Security Sciences Building.

99 GENERAL AND MISCELLANEOUS↗
DOE OSTI2021

Radiochemistry and Trinity

Forty seconds after Trinity detonated, Noble Laureate Enrico Fermi calculated the bomb’s energy release. By measuring the lateral dispersion of small pieces of paper dropped before, during, and after the blast wave passed him, he calculated an explosive yield of ten kilotons. Although Fermi’s estimate was only half of the official yield, it provided immediate confirmation that nuclear fission could be fashioned into a weapon of war.

38 RADIATION CHEMISTRY, RADIOCHEMISTRY, AND NUCLEA↗
DOE OSTI2021

Mother's Day tribute: Remembering mom of baby 'Trinity'

For Elizabeth “Diz” Graves, the summer months of 1945 were a symbolic intersection of her personal and professional lives. As a physicist with the then-secret lab in Los Alamos, Elizabeth participated in the Trinity test - the successful detonation of the world’s first nuclear weapon, which took place in the remote New Mexico desert on July 16, 1945. Her role was to observe the explosion that advanced science into the Atomic Age, according to records in the National Security Research Center (NSRC). This is the Lab’s classified library, which also houses unclassified legacy materials. And, Elizabeth was seven months pregnant.

45 MILITARY TECHNOLOGY, WEAPONRY, AND NATIONAL DEF↗
DOE OSTI2022

Trinity Test Wall Display

This document contains a mock-up of a wall display intended to be produced for a building on Laboratory campus. The display contains photographs taken of the Trinity Test.

99 GENERAL AND MISCELLANEOUS↗
DOE OSTI2023

Optimizing Performance on Trinity Utilizing Machine Learning, Proxy Applications and Scheduling Priorities

The sheer number of nodes continues to increase in today’s supercomputers, the first half of Trinity alone contains more than 9400 compute nodes. Since the speed of today’s clusters are limited by the slowest nodes, it more important than ever to identify slow nodes, improve their performance if it can be done, and assure minimal usage of slower nodes during performance critical runs. This is an ongoing maintenance task that occurs on a regular basis and, therefore, it is important to minimize the impact upon its users by assessing and addressing slow performing nodes and mitigating their consequences while minimizing down time. These issues can be solved, in large part, through a systematic application of fast running hardware assessment tests, the application of Machine Learning, and making use of performance data to increase efficiency of large clusters. Proxy applications utilizing both MPI and OpenMP were developed to produce data as a substitute for long runtime applications to evaluate node performance. Machine learning is applied to identify underperforming nodes, and policies are being discussed to both minimize the impact of underperforming nodes and increase the efficiency of the system. In this paper, I will describe the process used to produce quickly performing proxy tests, consider various methods to isolate the outliers, and produce ordered lists for use in scheduling to accomplish this task.

97 MATHEMATICS AND COMPUTING↗
NASA NTRS1972

A program to assess a thermal discharge on Trinity Bay, Texas

The application of a two dimensional mathematical model to the analysis of the thermal discharge to verify its ability to predict the temperature distribution of Trinity Bay in the vicinity of the water outfall. Basic data consist of aerial thermal infrared and in situ measurements.

Zaitzeff, J. B.↗
NASA NTRS1972

Trinity Bay Study: Dye tracing experiments

An analysis of the heat balance and temperature distribution within Trinity Bay near Galveston, Texas is presented. The effects of tidal currents, wind driven circulations, and large volume inflows are examined. Emphasis is placed on the effects of turbulent diffusion and local shears in currents. The technique of dye tracing to determine the parameters characterizing dispersion is described. Aerial photographs and maps are provided to show the flow conditions existing at different times and seasons.

Ward, G. H., Jr.↗
DOE OSTI2015

Project Trinity: The Myth, The Legend, The Legacy [Slides]

The Manhattan Project was established in June 1942. Its mission: beat the Nazis to the atomic bomb. Los Alamos was selected as the site for the weapons design laboratory. J. Robert Oppenheimer served as the Laboratory’s director. In the spring of 1944, Los Alamos scientists discovered plutonium would not work in a gun assembly. That summer, the Laboratory was reorganized to build an implosion bomb. Scientists were confident Little Boy, the uranium gun weapon, would perform in combat. Initially, however, scientists were skeptical its imploding plutonium counterpart would function. Eventually, due to improvements in the high explosives (HE), most scientists were confident the implosion bomb would work …but not confident enough to use it in combat without testing it first! Oppenheimer persuaded General Leslie Groves, Commander of the Manhattan Engineer District, to test.

Military Technology, Weaponry, & National Defense(↗