Design and Build of Reactor Simulator for Fission Surface Power Technology Demonstrator Unit

The Nuclear Systems Team at NASA Marshall Space Flight Center (MSFC) focuses on technology development for state of the art capability in non-nuclear testing of nuclear system and Space Nuclear Power for fission reactor systems for lunar and Mars surface power generation as well as radioisotope power systems for both spacecraft and surface applications. Currently being designed and developed is a reactor simulator (RxSim) for incorporation into the Technology Demonstrator Unit (TDU) for the Fission Surface Power System (FSPS) Program, which is supported by multiple national laboratories and NASA centers. The ultimate purpose of the RxSim is to provide heated NaK to a pair of Stirling engines in the TDU. The RxSim includes many different systems, components, and instrumentation that have been developed at MSFC while working with pumped NaK systems and in partnership with the national laboratories and NASA centers. The main components of the RxSim are a core, a pump, a heat exchanger (to mimic the thermal load of the Stirling engines), and a flow meter for tests at MSFC. When tested at NASA Glenn Research Center (GRC) the heat exchanger will be replaced with a Stirling power conversion engine. Additional components include storage reservoirs, expansion volumes, overflow catch tanks, safety and support hardware, instrumentation (temperature, pressure, flow) for data collection, and power supplies. This paper will discuss the design and current build status of the RxSim for delivery to GRC in early 2012

The Vehicle, Spring 1989

Table of Contents Home MoviesBob Zordanipage 4 Mummy BreathMichael Salempage 5 Pop ArtMonica Grothpage 6 Grey Haze and MoonAllison Stroudpage 7 The State of Being at a Soap & SudsDenise Santorpage 9 Letter HomeJim Reedpage 10 Thursday Afternoon in the StacksRebecca Dickenspage 11 Sizing DownMichael Salempage 12 Intellectual AnatomyMonica Grothpage 13 Grandmother PoemAmy Sparkspage 14 Blues of the BrothermanAlma Watsonpage 15 MigrationPatrick Peterspage 17 RidingBob Zordanipage 18 All Hallow\u27s EveErik Hansonpage 19 Waiting RoomAmy Sparkspage 20 Father, Forgive HerMonica Grothpage 21 Silent ReplyTom Caldwellpage 22 PhotographRobb Montgomerypage 24 WashdayAnn Moutraypage 25 PhotographDiane Atkinspage 26 Uptown FogRobb Montgomerypage 27 Shinbones and SkullsJennifer Berkshirepage 29 Sudden Small PhrasesPatrick Peterspage 31https://thekeep.eiu.edu/vehicle/1053/thumbnail.jp

Non-Nuclear Testing of Fission Technologies at NASA MSFC

Highly realistic non-nuclear testing can be used to investigate and resolve potential issues with space nuclear power and propulsion systems. Non-nuclear testing is particularly useful for systems designed with fuels and materials operating within their demonstrated nuclear performance envelope. Non-nuclear testing also provides an excellent way for screening potential advanced fuels and materials prior to nuclear testing, and for investigating innovative geometries and operating regimes. Non-nuclear testing allows thermal hydraulic, heat transfer, structural, integration, safety, operational, performance, and other potential issues to be investigated and resolved with a greater degree of flexibility and at reduced cost and schedule compared to nuclear testing. The primary limit of non-nuclear testing is that nuclear characteristics and potential nuclear issues cannot be directly investigated. However, non-nuclear testing can be used to augment the potential benefit from any nuclear testing that may be required for space nuclear system design and development. This paper describes previous and ongoing non-nuclear testing related to space nuclear systems at NASA s Marshall Space Flight Center (MSFC)

Adverse maternal, fetal, and newborn outcomes among pregnant women with SARS-CoV-2 infection: an individual participant data meta-analysis.

INTRODUCTION Despite a growing body of research on the risks of SARS-CoV-2 infection during pregnancy, there is continued controversy given heterogeneity in the quality and design of published studies. METHODS We screened ongoing studies in our sequential, prospective meta-analysis. We pooled individual participant data to estimate the absolute and relative risk (RR) of adverse outcomes among pregnant women with SARS-CoV-2 infection, compared with confirmed negative pregnancies. We evaluated the risk of bias using a modified Newcastle-Ottawa Scale. RESULTS We screened 137 studies and included 12 studies in 12 countries involving 13 136 pregnant women.Pregnant women with SARS-CoV-2 infection-as compared with uninfected pregnant women-were at significantly increased risk of maternal mortality (10 studies; n=1490; RR 7.68, 95% CI 1.70 to 34.61); admission to intensive care unit (8 studies; n=6660; RR 3.81, 95% CI 2.03 to 7.17); receiving mechanical ventilation (7 studies; n=4887; RR 15.23, 95% CI 4.32 to 53.71); receiving any critical care (7 studies; n=4735; RR 5.48, 95% CI 2.57 to 11.72); and being diagnosed with pneumonia (6 studies; n=4573; RR 23.46, 95% CI 3.03 to 181.39) and thromboembolic disease (8 studies; n=5146; RR 5.50, 95% CI 1.12 to 27.12).Neonates born to women with SARS-CoV-2 infection were more likely to be admitted to a neonatal care unit after birth (7 studies; n=7637; RR 1.86, 95% CI 1.12 to 3.08); be born preterm (7 studies; n=6233; RR 1.71, 95% CI 1.28 to 2.29) or moderately preterm (7 studies; n=6071; RR 2.92, 95% CI 1.88 to 4.54); and to be born low birth weight (12 studies; n=11 930; RR 1.19, 95% CI 1.02 to 1.40). Infection was not linked to stillbirth. Studies were generally at low or moderate risk of bias. CONCLUSIONS This analysis indicates that SARS-CoV-2 infection at any time during pregnancy increases the risk of maternal death, severe maternal morbidities and neonatal morbidity, but not stillbirth or intrauterine growth restriction. As more data become available, we will update these findings per the published protocol

Erratum: Corrigendum: Sequence and comparative analysis of the chicken genome provide unique perspectives on vertebrate evolution

International Chicken Genome Sequencing Consortium. The Original Article was published on 09 December 2004. Nature432, 695–716 (2004). In Table 5 of this Article, the last four values listed in the ‘Copy number’ column were incorrect. These should be: LTR elements, 30,000; DNA transposons, 20,000; simple repeats, 140,000; and satellites, 4,000. These errors do not affect any of the conclusions in our paper. Additional information. The online version of the original article can be found at 10.1038/nature0315

The Vehicle, Spring 1989

Table of Contents Home MoviesBob Zordanipage 4 Mummy BreathMichael Salempage 5 Pop ArtMonica Grothpage 6 Grey Haze and MoonAllison Stroudpage 7 The State of Being at a Soap & SudsDenise Santorpage 9 Letter HomeJim Reedpage 10 Thursday Afternoon in the StacksRebecca Dickenspage 11 Sizing DownMichael Salempage 12 Intellectual AnatomyMonica Grothpage 13 Grandmother PoemAmy Sparkspage 14 Blues of the BrothermanAlma Watsonpage 15 MigrationPatrick Peterspage 17 RidingBob Zordanipage 18 All Hallow\u27s EveErik Hansonpage 19 Waiting RoomAmy Sparkspage 20 Father, Forgive HerMonica Grothpage 21 Silent ReplyTom Caldwellpage 22 PhotographRobb Montgomerypage 24 WashdayAnn Moutraypage 25 PhotographDiane Atkinspage 26 Uptown FogRobb Montgomerypage 27 Shinbones and SkullsJennifer Berkshirepage 29 Sudden Small PhrasesPatrick Peterspage 31https://thekeep.eiu.edu/vehicle/1053/thumbnail.jp