57 research outputs found

    Directional Doppler bloodflow meter Progress report

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    Ultrasonic blood flowmeter using Doppler effect in acoustic scattering from moving corpuscle

    Variability in sonic-boom signatures measured along an 8000-foot linear array

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    Variability in sonic boom signatures measured along 8000 foot linear microphone arra

    Stationary Kolmogorov Solutions of the Smoluchowski Aggregation Equation with a Source Term

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    In this paper we show how the method of Zakharov transformations may be used to analyze the stationary solutions of the Smoluchowski aggregation equation for arbitrary homogeneous kernel. The resulting massdistributions are of Kolmogorov type in the sense that they carry a constant flux of mass from small masses to large. We derive a ``locality criterion'', expressed in terms of the asymptotic properties of the kernel, that must be satisfied in order for the Kolmogorov spectrum to be an admissiblesolution. Whether a given kernel leads to a gelation transition or not can be determined by computing the mass capacity of the Kolmogorov spectrum. As an example, we compute the exact stationary state for the family of kernels,Kζ(m1,m2)=(m1m2)ζ/2K_\zeta(m_1,m_2)=(m_1m_2)^{\zeta/2} which includes both gelling and non-gelling cases, reproducing the known solution in the case ζ=0\zeta=0. Surprisingly, the Kolmogorov constant is the same for all kernels in this family.Comment: This article is an expanded version of a talk given at IHP workshop "Dynamics, Growth and Singularities of Continuous Media", Paris July 2003. Updated 01/04/04. Revised version with additional discussion, references added, several typographical errors corrected. Revised version accepted for publication by Phys. Rev.

    Scientific Objectives of Einstein Telescope

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    The advanced interferometer network will herald a new era in observational astronomy. There is a very strong science case to go beyond the advanced detector network and build detectors that operate in a frequency range from 1 Hz-10 kHz, with sensitivity a factor ten better in amplitude. Such detectors will be able to probe a range of topics in nuclear physics, astronomy, cosmology and fundamental physics, providing insights into many unsolved problems in these areas.Comment: 18 pages, 4 figures, Plenary talk given at Amaldi Meeting, July 201

    Plant species diversity for sustainable management of crop pests and diseases in agroecosystems: a review

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