2,717 research outputs found

    Comparisons of three popular rose (Rosa Hybrida L.) cultivars

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    1994 Spring.Covers not scanned.Includes bibliographical references.Two-year-old Rosa hybrida L. 'Royalty', 'Emblem', and 'Samantha' plants were pinched on 20 October 1992 for a Christmas crop and on 28 December 1992 for a Valentine's Day crop. All temperature set points were 22C/17C day/night. At 10 and 25 days after pinch, and at flowering, 5 shoots from each bench location were destructively sampled for leaf (node) number, stem length, stem diameter, and fresh and dry weights of stem, leaves, flower bud, and total. Time to visible bud, to color, and to flower from pinch were recorded as were number of flowers and blind shoots produced. Results were tabulated; an analysis of variance showed that the three rose cultivars produced flowers that were not significantly different but did vary as far as numbers of flowers produced and stem length. Seasonality also produced some differences. Based upon an analysis of variance on the 1992 Christmas crop, the study found no significant differences for flowering times, but found differences in numbers of both flowers and blind shoots produced. Based upon an analysis of variance for the 1993 Valentine's Day crop, the study also found no significant differences for flowering times, but found differences in number of flowers, but not number of blind shoots, produced and in stem length. Based upon an analysis of variance comparing the three cultivars, with the Christmas and Valentine's Day crops combined, the study showed differences in number of flowers produced and stem length. Based upon an analysis of variance comparing the Christmas and Valentine's Day crops (all three cultivars combined), the study showed no difference in number of flowers produced, more blind shoots at Christmas, and a longer and heavier Valentine's Day flower, although flowers took longer to reach maturity

    Cumulant expansion for phonon contributions to the electron spectral function

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    We describe an approach for calculations of phonon contributions to the electron spectral function, including both quasiparticle properties and satellites. The method is based on a cumulant expansion for the retarded one-electron Green's function and a many-pole model for the electron self-energy. The electron-phonon couplings are calculated from the Eliashberg functions, and the phonon density of states is obtained from a Lanczos representation of the phonon Green's function. Our calculations incorporate ab initio dynamical matrices and electron-phonon couplings from the density functional theory code ABINIT. Illustrative results are presented for several elemental metals and for Einstein and Debye models with a range of coupling constants. These are compared with experiment and other theoretical models. Estimates of corrections to Migdal's theorem are obtained by comparing with leading order contributions to the self-energy, and are found to be significant only for large electron-phonon couplings at low temperatures

    Miss Caroline / words by Thos. S. Allen

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    Cover: drawing of an African American male singing and playing a five string banjo, while an African American female makes eyes at him; description reads southern serenade song; Publisher: O. E. Story (Boston)https://egrove.olemiss.edu/sharris_c/1064/thumbnail.jp

    As-built design specification for P1A software system modified display subsystem

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    This document contains the design of the proportional estimate processor which was written to satisfy the software requirement of Part A of the P1A experiment. The purposes of the project are: (1) to select the dots to be labelled; (2) to create tables of green numbers and brightness values for all selected dots per acquisition; (3) to create scatter plots of green numbers vs brightness for each acquisition for all selected dots. If labels have been provided then scatter plots of only categories of interest can be optionally produced; and (4) to produce trajectory plots of green number vs brightness at differing acquisition times for each dot. These plots need to be in the same order as the list of selected dots. When labels are provided only plots of dots of categories of interest are to be produced

    After a Tear Comes a Smile

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    https://digitalcommons.library.umaine.edu/mmb-vp/1156/thumbnail.jp

    A Measurement of the Cosmic Microwave Background Damping Tail from the 2500-Square-Degree SPT-SZ Survey

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    We present a measurement of the cosmic microwave background (CMB) temperature power spectrum using data from the recently completed South Pole Telescope Sunyaev-Zel'dovich (SPT-SZ) survey. This measurement is made from observations of 2540 deg^2 of sky with arcminute resolution at 150 GHz, and improves upon previous measurements using the SPT by tripling the sky area. We report CMB temperature anisotropy power over the multipole range 650 < ℓ < 3000. We fit the SPT bandpowers, combined with the 7 yr Wilkinson Microwave Anisotropy Probe (WMAP7) data, with a six-parameter ΛCDM cosmological model and find that the two datasets are consistent and well fit by the model. Adding SPT measurements significantly improves ΛCDM parameter constraints; in particular, the constraint on θ_s tightens by a factor of 2.7. The impact of gravitational lensing is detected at 8.1σ, the most significant detection to date. This sensitivity of the SPT+WMAP7 data to lensing by large-scale structure at low redshifts allows us to constrain the mean curvature of the observable universe with CMB data alone to be Ω_k=-0.003^(+0.014)_(-0.018). Using the SPT+WMAP7 data, we measure the spectral index of scalar fluctuations to be n_s = 0.9623 ± 0.0097 in the ΛCDM model, a 3.9σ preference for a scale-dependent spectrum with n_s < 1. The SPT measurement of the CMB damping tail helps break the degeneracy that exists between the tensor-to-scalar ratio r and n_s in large-scale CMB measurements, leading to an upper limit of r < 0.18 (95% C.L.) in the ΛCDM+r model. Adding low-redshift measurements of the Hubble constant (H_0) and the baryon acoustic oscillation (BAO) feature to the SPT+WMAP7 data leads to further improvements. The combination of SPT+WMAP7+H_0+BAO constrains n_s = 0.9538 ± 0.0081 in the ΛCDM model, a 5.7σ detection of n_s < 1, and places an upper limit of r < 0.11 (95% C.L.) in the ΛCDM+r model. These new constraints on n_s and r have significant implications for our understanding of inflation, which we discuss in the context of selected single-field inflation models
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