1,222 research outputs found

    High precision instrumentation and control

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    Ph.DDOCTOR OF PHILOSOPH

    Self-Calibration Methods for Uncontrolled Environments in Sensor Networks: A Reference Survey

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    Growing progress in sensor technology has constantly expanded the number and range of low-cost, small, and portable sensors on the market, increasing the number and type of physical phenomena that can be measured with wirelessly connected sensors. Large-scale deployments of wireless sensor networks (WSN) involving hundreds or thousands of devices and limited budgets often constrain the choice of sensing hardware, which generally has reduced accuracy, precision, and reliability. Therefore, it is challenging to achieve good data quality and maintain error-free measurements during the whole system lifetime. Self-calibration or recalibration in ad hoc sensor networks to preserve data quality is essential, yet challenging, for several reasons, such as the existence of random noise and the absence of suitable general models. Calibration performed in the field, without accurate and controlled instrumentation, is said to be in an uncontrolled environment. This paper provides current and fundamental self-calibration approaches and models for wireless sensor networks in uncontrolled environments

    Effect of dislocations upon the catalytic activity of silver /

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    Millimeter and sub-millimeter wave radiometers for atmospheric remote sensing from CubeSat platforms

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    2018 Fall.Includes bibliographical references.To view the abstract, please see the full text of the document

    Index to NASA Tech Briefs, 1974

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    The following information was given for 1974: (1) abstracts of reports dealing with new technology derived from the research and development activities of NASA or the U.S. Atomic Energy Commission, arranged by subjects: electronics/electrical, electronics/electrical systems, physical sciences, materials/chemistry, life sciences, mechanics, machines, equipment and tools, fabrication technology, and computer programs, (2) indexes for the above documents: subject, personal author, originating center

    Cumulative Index to NASA Tech Briefs, 1963 - 1966

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    Cumulative index of NASA Tech Briefs dealing with electrical and electronic, physical science and energy sources, materials and chemistry, life science, and mechanical innovation

    Cumulative index to NASA Tech Briefs, 1963-1965

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    Annotated bibliography of NASA technical briefs on electrical, energy sources, materials, life sciences, and mechanical informatio
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