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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 1,477 records · Page 82
All sourcesNASA NTRSDOE OSTI
NASA NTRS1966

Halftone teletypewriter.

Half-tone Teletypewriter prints out picture from slow scan digital TV source

INTERPLANETARY COMMUNICATION↗
NASA NTRS1967

Visualization of hydrogen fires.

Hydrogen fire visualization detection techniques including application of photography, TV and image converter in IR and UV regions

ULTRAVIOLET RADIATION↗
NASA NTRS1994

The Development of a GaAs MMIC Reliability and Space Qualification Guide

NASA, JPL, and DOD are collaborating with GaAs MMIC users, manufacturers, and international space agencies to develop the “GaAs MMIC Reliability and Space Qualification Guide.” This paper discusses the need for a space qualification guide, provides a brief description of some common GaAs failure mechanisms, the approach that the NASA MMIC Reliability Assurance Program is following to develop the guide, and the status of the program.

exploration↗
DOE OSTI2015

Characterizations of the radioactive waste by the remotely-controlled collimated spectrometric system

Decontamination and decommissioning of the research reactors MR (Testing Reactor) and RFT (Reactor of Physics and Technology) has recently been initiated in the National Research Center (NRC) 'Kurchatov institute', Moscow. In the building, neighboring to the reactor, the storage of HLRW is located. The storage is made of monolithic concrete in which steel cells depth 4 m are located. In cells of storage the HLRW packed into cases are placed. These the radioactive waste are also subject to export on long storage in the specialized organization. For characterization of the radioactive waste in cases the remote-controlled collimated spectrometer system was used. The system consists of a spectrometric collimated gamma-ray detector, a color video camera and a control unit, mounted on a rotator, which are mounted on a tripod with the host computer. For determination of specific activity of radionuclides in cases, it is developed programs of calculation of coefficients of proportionality of specific activity to the corresponding speeds of the account in peaks of full absorption at single specific activity of radionuclides in cases. For determination of these coefficients the mathematical model of spectrometer system based on the Monte-Carlo method was used. Dependences of calibration coefficients for various radionuclides from distance between the detector and a case at various values of the radioactive waste density in cases are given. Measurements of specific activity in cases are taken and are discussed. By results of measurements decisions on the appeal of the radioactive waste being in cases are made. (authors)

12 MANAGEMENT OF RADIOACTIVE AND NON-RADIOACTIVE W↗
DOE OSTI2015

Use of the underwater collimated spectrometric system for survey of storage ponds of research VVR-2 and or reactors - 15118

Spent nuclear fuel removal activities in the National Research Centre 'Kurchatov Institute' were resumed in 2004. During the last two years, removal was performed of the spent nuclear fuel from the VVR-2 and OR reactor installations, whose storage facilities are located within the Gas Plant complex. The Gas Plant complex is the experimental base of the Institute of Nuclear Reactors, which is part of the 'Kurchatov Institute'. The complex features four storage facilities for spent nuclear fuel, one in a dedicated building for storage of spent nuclear fuel and solid rad-waste and three in the reactor building. They are sub-surface vessels filled with water (the volume of water in each is about 6 m{sup 3}), closed with top shielding slabs. Some spent fuel assemblies and fuel elements stored are resized, deformed, or have defective claddings. In the course of works on removal from ponds of the spent nuclear fuel, its fragments could get to water. The bottoms of ponds storage are covered with a deposit. The bottom of ponds and water are possible to be pollution by fission products. The survey objective was to find uranium-containing materials (elements of irradiated nuclear fuel) at the bottom of the ponds and evaluation of surface activity of fission products. To solve this problem was used the underwater collimated spectrometric system on the basis of a semiconductor detector CdZnTe (volume of a crystal of 20 mm{sup 3}) and a multichannel analyzer InSpector 2000. The detector with the collimator is placed in the waterproof case on which the video camera fastens. The principle of detection of uranium-containing materials is based on the identification of the characteristic peaks in the spectra of uranium radiation measurements in the energy range 95 - 115 keV. The results of the most representative measurements at the bottom of reactor ponds are given. The received results are discussed; comparison of results between in-site pond measurements and gamma spectrometric and radiochemical analysis of the water in the lab is carried out. The received results will be used for scheduling on pond cleaning. (authors)

12 MANAGEMENT OF RADIOACTIVE AND NON-RADIOACTIVE W↗
DOE OSTI2018

Visual Servoing System for the Removal of the Elements of a Prefilter in a NPP - 18429

The maintenance of the prefilters of the condensate demineralizers in a BWR reactor nuclear plant, could represents a real problem given the substances (radioactive particles) captured by the filtering elements (called 'candles'). This trapped material can produce high doses on the personnel participating in this maintenance work. Thus, it is desirable to automate the maintenance activities required to remove the used filtering elements. Then we designed a robotic manipulator capable of detaching, one by one, the filtering elements from their fastening structure. The manipulator deposits the 'candles' into a container as they are detached, and at the end, it is automatically transported, to a storage area. The work here presented, proposes the application of the 'visual servoing control' technique to automate the operation of the robotic arm. This would minimize the intervention of human operators, reducing maintenance times and radiation dose to the personnel. The methodology is based on techniques of artificial vision and uses, in addition to a video camera, a device capable of generating a laser line, which when projected onto 3D space, creates what is known as a laser plane. This plane upon striking the candles will generate circumferential arcs in the video camera images, and these figures will be used to detect the 3D point that will guide the manipulator to take the filtering element. (authors)

12 MANAGEMENT OF RADIOACTIVE AND NON-RADIOACTIVE W↗
DOE OSTI2019

Chernobyl, the HBO miniseries: Fact and fiction (Part III)

With episode four of the series, we moved even further from reality than in prior episodes. First, we need background. Exposure to ionizing radiations causes two types of medical effects: deterministic and stochastic. Deterministic effects are predictable, dose-dependent, and occur in everyone exposed to the same dose. For example, everyone exposed to an acute whole-body dose of 5 gray (5,000 millisieverts) will have a marked immediate decrease in blood granulocytes.

21 SPECIFIC NUCLEAR REACTORS AND ASSOCIATED PLANTS↗
DOE OSTI2018

Chernobyl, the HBO miniseries: Fact and fiction

Two weeks ago, HBO began screening a five-part series on Monday nights on the Chernobyl nuclear power facility (NPF) accident, which occurred more than 30 years ago on April 26, 1986. The series focuses predominately on events leading to the accident, the scientific, social and political environments in the Soviet Union at that time and, to a lesser degree, on immediate and long-term medical consequences. The series is strong on the former, but weaker on the latter. Although the producer and writers have made considerable effort to present a factual account of the accident and its consequences, much of how the story unfolds is fictionalized.

21 SPECIFIC NUCLEAR REACTORS AND ASSOCIATED PLANTS↗