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Filtering by: Alternative title ssim Technical note no. D-11 Remove constraint Alternative title ssim: Technical note no. D-11 Decade 1970-1979 Remove constraint Decade: 1970-1979 Resource Type Article Remove constraint Resource Type: Article

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  • Albacore oceanography off Oregon : 1970

    Creator:
    Pearcy, William G.
    Abstract:
    During July 1970, albacore boats trolling surface jigs (jig boats) had record catches in an area off the mouth of the Columbia River. The jig fishery declined suddenly in late July and was poor throughout the remainder of the summer. No obvious oceanographic changes were correlated with these drastic changes...
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    was poor throughout the remainder of the summer. No obvious oceano- graphic changes were correlated

  • Existence and Representation Theorems for a Semilinear Sobolev Equation in Banach Space

    Creator:
    Showalter, R. E.
    Abstract:
    An existence theory is developed for a semilinear evolution equation in Banach space which is modeled on boundary value problems for partial differential equations of Sobolev type. The operators are assumed to be measurable and to satisfy coercive estimates which are not necessarily uniform in their time dependence, and to...
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    }. Note that an element x V is in D(M(t)) if and only if the conjugate- linear map y- m(t; x, y)" V C is

  • Nonlinear Degenerate Evolution Equations and Partial Differential Equations of Mixed Type

    Creator:
    Showalter, R. E.
    Abstract:
    The Cauchy problem for the evolution equation Mu’(t) + N(t,u(t)) = 0 is studied, where M and N(t,•) are, respectively, possibly degenerate and nonlinear monotone operators from a vector space to its dual. Sufficient conditions for existence and for uniqueness of solutions are obtained by reducing the problem to an...
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    (G) is the distribution on G given by (4.6) N() (D)N)(., O)) + No(’, D). j=l This defines our

  • A Priori Error Estimates for Approximation of Parabolic Boundary Value Problems

    Creator:
    Showalter, R. E.
    Abstract:
    The L²-error estimates are established for the continuous time Faedo-Galerkin approximation to solutions of a linear parabolic initial boundary value problem that has elliptic part of order 2m. Properties of analytic semigroups are used to obtain these estimates directly from the L²-estimates for the corresponding steady state elliptic problem under...
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    value problems SIAM J. NUMER. ANAL. VOI. 12, No. 3, June 1975 A PRIORI ERROR ESTIMATES FOR

  • Pseudoparabolic Partial Differential Equations

    Creator:
    Showalter, R. E. and Ting, T. W.
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    . Vol. 1, No. 1, February 1970 PSEUDOPARABOLIC PARTIAL DIFFERENTIAL EQUATIONS* R. E. SHOWALTERt AND T

  • Regularization and Approximation of Second Order Evolution Equations

    Creator:
    Showalter, R. E.
    Abstract:
    We give a nonstandard method of integrating the equation Bu" + Cu’ + Au = f in Hilbert space by reducing it to a first order system in which the differentiated term corresponds to energy. Semigroup theory gives existence for hyperbolic and for parabolic cases. When C = εA, ε...
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    equations SIAM J. MATH. ANAL. Vol. 7, No. 4, August 1976 REGULARIZATION AND APPROXIMATION OF SECOND ORDER

  • Well-Posed Problems for a Partial Differential Equation of Order 2m + 1

    Creator:
    Showalter, R. E.
    Abstract:
    We are concerned here with well-posed problems for the partial differential equation uₜ(x, t) + yMuₜ(x, t) + Lu(x, t) = f(x, t) containing the elliptic differential operator M of order 2m and the differential operator L of order ≤2m. Hilbert space methods are used to formulate and solve an...
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    ) implies that L is a bijection of D(L) onto H [11], [12], [15], [16]. In fact, (2.2) and (1.11) imply that

  • Temporal variability of suspended matter in Astoria Canyon

    Creator:
    Plank, William S., Zaneveld, J. Ronald, and Pak, Hasong
    Abstract:
    Suspended matter in Astoria canyon was monitored by means of an in situ nephelometer and by means of light-scattering and particle concentration measurements performed aboard ship on water samples. Nephelometer profiles obtained along the axis of the canyon in February and April 1973 indicate that the canyon is divided into...
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    VOL. 79, NO. 30 JOURNAL OF GEOPHYSICAL RESEARCH OCTOBER 20, 1974 Temporal Variability of Suspended

  • The diffuse solar irradiance of slopes under cloudless skies

    Creator:
    Steven, M. D. and Unsworth, Michael H.
    Abstract:
    The diffuse irradiance of slopes relative to the diffuse irradiance of a horizontal surface is calculated by integrating the mean radiance distributions of cloudless skies in Britain for a wide range of solar elevations, azimuths and slope angles. There is reasonable agreement with measurements reported from a number of stations;...
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    present no standardization in the methods used to measure or estimate S d , and this may cause problems

  • Attenuation of total solar radiation by aerosol over Britain and the Atlantic Ocean

    Creator:
    Unsworth, Michael H. and Monteith, J. L.
    Abstract:
    In a recent note, Collier and Lockwood (1974) compared measurements of total solar radiation on cloudless days at an inland site in England with radiation calculated from empirical expressions derived from (i) data from weather ships in the eastern Atlantic (Lumb 1964) and (ii) measurements of radiation and turbidity in...
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    . MONTEITH In a recent note, Collier and Lockwood (1974) compared measurements of total solar radiation on