13 research outputs found

    Limitations on the attainable intensity of high power lasers

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    It is shown that even a single ee+e^-e^+ pair created by a super strong laser field in vacuum would cause development of an avalanche-like QED cascade which rapidly depletes the incoming laser pulse. This confirms the old N. Bohr conjecture that the electric field of the critical QED strength ES=m2c3/eE_S=m^2c^3/e\hbar could never be created.Comment: 4 pages, 3 figure

    The James Webb Space Telescope Mission

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    Twenty-six years ago a small committee report, building on earlier studies, expounded a compelling and poetic vision for the future of astronomy, calling for an infrared-optimized space telescope with an aperture of at least 4m4m. With the support of their governments in the US, Europe, and Canada, 20,000 people realized that vision as the 6.5m6.5m James Webb Space Telescope. A generation of astronomers will celebrate their accomplishments for the life of the mission, potentially as long as 20 years, and beyond. This report and the scientific discoveries that follow are extended thank-you notes to the 20,000 team members. The telescope is working perfectly, with much better image quality than expected. In this and accompanying papers, we give a brief history, describe the observatory, outline its objectives and current observing program, and discuss the inventions and people who made it possible. We cite detailed reports on the design and the measured performance on orbit.Comment: Accepted by PASP for the special issue on The James Webb Space Telescope Overview, 29 pages, 4 figure

    Solid state electronic devices

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    Solid state electronic devices 5th ed./ Streetman

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    xviii, 558 hal.; ill; tab; 23 c

    Peranti elektronik keadaan pepejal

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    xv+332hlm.;24c

    Solid state electronic devices

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    Includes bibliographical references and index
    corecore