118,384 research outputs found
Congruence curves of the Goldstein-Petrich flows
No full textWe study the existence of contours which evolve retaining their shapes under the second Goldstein-Petrich flow. We present a proof of the existence, for each integer n >= 2, of a 1-parameter family of non-congruent Goldstein-Petrich contours of R(2) with symmetry group of order n. Explicit algorithms to compute and visualize the contours and their evolution are give
Phillip G. Back papers
No full textThis collection contains documents and correspondence from the collection of Phillip Goldstein Back (1902-1979), a long-time resident of Little Rock and prominent Jewish businessman
Faculty Recital, Gila Goldstein, September 16, 2013
No full textThis is the concert program of the Faculty Recital, Gila Goldstein performance on Monday, September 16, 2013 at 8:00 p.m., at the Boston University Concert Hall, 855 Commonwealth Avenue, Boston, Massachusetts. Works performed were Partita no. 6 in E minor by Johann Sebastian Bach; Polonaise op. 26 no. 1 in C# minor, Nocturne op. 62 no. 1 in G major, and Barcarolle op. 60 in F# major by Frédéric Chopin; Vallée d'Obermann by Franz Liszt; and Five Pieces op. 34 by Paul Ben-Haim. Digitization for Boston University Concert Programs was supported by the Boston University Humanities Library Endowed Fund
Goldstein Sidney et divers — The Norristown Study
No full textP. G. Goldstein Sidney et divers — The Norristown Study. In: Population, 19ᵉ année, n°1, 1964. p. 177
Stability Estimates for Nonlinear Hyperbolic Problems with nonlinear Wentzell boundary conditions
No full textOf concern is the nonlinear hyperbolic problem with nonlinear dynamic boundary conditions
utt = div( A∇u) − γ (x, ut ), in (0, ∞) × Ω,
u(0, ·) = f , ut (0, ·) = g, in Ω,
utt + β∂ Aν u + c(x)u + δ(x, ut ) − qβ∆LB u = 0, on (0, ∞) × ∂ Ω.
for t ≥ 0 and x ∈ Ω ⊂ R^N
; the last equation holds on the boundary ∂ Ω. Here
A = {aij (x)}ij is a real,
hermitian, uniformly positive definite N
× N matrix; β ∈ C (∂ Ω), with β > 0; γ : Ω × R → R; δ : ∂ Ω × R →
R; c : ∂ Ω → R; q ≥ 0, ∆LB is the Laplace-Beltrami operator on ∂ Ω, and ∂ Aν u is the conormal derivative of u with respect to A; everything is sufficiently regular. We prove explicit stability estimates of the solution
u with respect to the coefficients A, β, γ , δ, c, q, and the initial conditions f , g. Our arguments cover the singular case of a problem with q = 0 which is approximated by problems with positive q
Gigliola Sulis speaks to Ann Goldstein: writing locally, translating globally
No full textThe conversation focuses on attitudes and trends in the US publishing market toward translated fiction. The strategies used by Goldstein as a translator of geo-centred and multilingual Italian novels are analysed, with reference to her translations of Pier Paolo Pasolini, Primo Levi, Elena Ferrante, Milena Agus, and Amara Lakhous
Spectral representation of the weighted Laplace transform
No full textWe find the spectral representation of the selfadjoint operators T Tf(λ)≔∫0∞K(λt)f(t)dt,in L2(]0,∞[), where 0≤K∈Lloc1(0,∞). More precisely (see Theorem 4.1) for these operators which include the Laplace transform as a special case, the spectrum of T is a compact interval [−κ,κ], and we find explicitly a unitary operator U:L2(]0,∞[)→L2(R) and a continuous real function α on R such that UTU−1 is the operator of multiplication by α
The weighted Laplace transform
No full textWe consider for (formula presented) the operator (formula presented) and we investigate boundedness properties of Tα over the spaces LP (]0, ∞[, tα dt)
Goldstein grade 7a report card
No full textA monthly grade report for Nathan Goldstein. The form was 19-15M-8-24. Goldstein attended school number 24 in Wilmington, Delaware. He was in grade 7a from 1924 to 1925. A table contains Goldstein's grades from the four school periods. He earned marks in reading, arithmetic, geography, language/grammar, spelling, American history/civics, physical, penmanship, music, manual training, literature, conduct, effort, and civics. There are spaces to mark how often Goldstein was tardy and absent. Below the table is an explanation of the marks. "E," meaning excellent work, meant the student earned 90 to 100 percent; "G," meaning good, meant the student earned 80 to 90 percent; "F," meaning fair, meant the student earned 80 to 70 percent; "U," meaning unsatisfactory, which means the student earned 70 to 60 percent; and "VP," which means very poor, means the student earned less than 60 percent. Students had to get an F or higher to be promoted. Goldstein had a mix of F's, G's, and E's. M. J. Murphy was his teacher. On the back is a note to parents or guardians. A few paragraphs emphasize the importance of cooperation between the home and school and provide suggestions for what parents can do to support their students. There is a space for parent or guardian signatures. Mrs. J. Goldstein signed it twice, and Jacob Goldstein signed it once. The back of the card is labeled 5.00
Classification of general Wentzell boundary conditions for fourth order operators in one space dimension
No full textIn this paper we consider a fourth order linear ordinary differential operator in one space dimension. We impose, at each endpoint, one general Wentzell boundary condition as well as one other linear boundary. Our goal is to classify precisely when these operators are symmetric, semibounded and/or quasiaccretive. In particular these results extend the collection of boundary conditions for which the one-dimensional beam equation u(tt) + c(2)u(xxxx) = 0 is well-posed
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