38,195 research outputs found
Ellison, Ralph N to Walter B. Williams
No full textLetter, 1936 Nov. 12 to Walter B. Williams from Ralph N. Ellison 5 p., 28 x 21 cm. typescript &holograph, donated by J. Leon Langhorne,11/17/821. Ralph N. Ellison, 2. Homosexuality -personal narratives, discusses internal conflicts which developed between two roommates, one of which was a homosexual.https://dh.howard.edu/og_corres/1087/thumbnail.jp
A Historical Guide to Ralph Ellison
No full textThe essays in this collection treat the whole of Ralph Ellison's body of work, including his famous novel Invisible Man. The volume confronts Ellison the man of ideas, essayist, and short story writer, as well as the material in his posthumously published novel Juneteenth, in order to provide contemporary readers and critics with a comprehensive examination of Ellison.Intro -- Contents -- Abbreviations -- Introduction -- Ralph Ellison, 1913-1994: A Brief Biography -- ELLISON IN HIS TIME -- "Creative and Cultural Lag": The Radical Education of Ralph Ellison -- A Delicate Ear, a Retentive Memory, and the Power to Weld the Fragments -- "Something Warmly, Infuriatingly Feminine": Gender, Sexuality, and the Work of Ralph Ellison -- The Integrated Literary Tradition -- Ralph Ellison's Politics of Integration -- Illustrated Chronology -- Bibliographical Essay: Probing the Lower Frequencies: Fifty Years of Ellison Criticism -- Contributors -- Index -- A -- B -- C -- D -- E -- F -- G -- H -- I -- J -- K -- L -- M -- N -- O -- P -- Q -- R -- S -- T -- U -- V -- W -- Y -- ZThe essays in this collection treat the whole of Ralph Ellison's body of work, including his famous novel Invisible Man. The volume confronts Ellison the man of ideas, essayist, and short story writer, as well as the material in his posthumously published novel Juneteenth, in order to provide contemporary readers and critics with a comprehensive examination of Ellison.Description based on publisher supplied metadata and other sources.Electronic reproduction. Ann Arbor, Michigan : ProQuest Ebook Central, YYYY. Available via World Wide Web. Access may be limited to ProQuest Ebook Central affiliated libraries
Evaluation of new diagnostic and treatment strategies in the management of the Zollinger-Ellison syndrome
No full textIncludes bibliography.Despite major advances over the last two decades with the management of patients with Zollinger-Ellison syndrome (ZES), unanswered questions remain concerning the natural history of the disease, the impact of new diagnostics modalities on cure rates, and the role of surgery in the era of modem medical therapies. The aims of the thesis are to (i) analyse the database of 40 ZES patients treated at Groote Schuur Hospital (GSH) over two decades, with special reference to the impact of various surgical strategies on outcome, (ii) investigate a possible correlation between biological tissue marker expression and tumour behaviour, (iii) study the effect of somatostatin receptor scintigraphy (SRS) on surgical cure rates, and (iv) assess the efficacy and safety of a new proton pump inhibitor (pantoprazole) in controlling acid hypersecretion
Ellison, Ralph N to Walter B. Williams - Greeting Card
No full textGreeting card to Walter B. Williams from Ralph N. Ellison.2 p. Folio. 16 x 12 cm. “Merry Christmas and a Happy New Year”“In Memory of Things Now Past” (handwritten)https://dh.howard.edu/og_corres/1088/thumbnail.jp
Measurement of the ratio of branching fractions B(B0→K∗0γ )/B(B0s→φγ ) and the directCP asymmetry inB 0→K∗0γ
No full textThe ratio of branching fractions of the radiative B decays B0→K⁎0γ and B0s→ϕγ has been measured using an integrated luminosity of 1.0 fb−1 of pp collision data collected by the LHCb experiment at a centre-of-mass energy of s√=7TeV. The value obtained is
B(B0→K⁎0γ)B(B0s→ϕγ)=1.23±0.06(stat.)±0.04(syst.)±0.10(fs/fd),
where the first uncertainty is statistical, the second is the experimental systematic uncertainty and the third is associated with the ratio of fragmentation fractions fs/fd. Using the world average value for B(B0→K⁎0γ), the branching fraction B(B0s→ϕγ) is measured to be (3.5±0.4)×10−5.
The direct CP asymmetry in B0→K⁎0γ decays has also been measured with the same data and found to be
ACP(B0→K⁎0γ)=(0.8±1.7(stat.)±0.9(syst.))%.
Both measurements are the most precise to date and are in agreement with the previous experimental results and theoretical expectations
TELIS: TErahertz and subMMW LImb Sounder – Project summary after first successful flight
No full textThe TELIS instrument is a balloon-borne cryogenic three-channel heterodyne spectrometer for limb sounding of stratospheric trace gases. The instrument is flown together with the MIPAS-B Fourier-transform spectrometer of the IMK, Karlsruhe. TELIS was developed by a European consortium involving research institutions, universities, and industrial partners.
Thermal emission radiation is coupled in by a 26x13 cm dual offset Cassegrain telescope controlled to maintain constant tangent height during measurement. Radiometric calibration is achieved by a blackbody and deep space view. The radiation is divided into three channels by means of a polarizer and a dichroic. Within a special lightweight cryostat three complete heterodyne receivers are kept at liquid helium temperature: THZ channel, 1750-1890 GHz, hot electron bolometer mixer, DLR; SIR channel, 450-650 GHz, integrated receiver, SIS mixer, SRON (see poster ‘TELIS instrument performance analysis’); subMMW channel, 499-503 GHz, SIS mixer, RAL. A digital autocorrelator spectrometer with 4 GHz bandwidth and ca. 2 MHz resolution serves as backend shared among the channels.
The first successful flight was in March 2009 in Kiruna, Sweden. Calibrated spectra are so far only available as quicklook data. Sideband ratios have been characterized recently. The radiometric accuracy of the autocorrelator is under investigation (see poster ‘Characterisation of the TELIS autocorrelator spectrometer’).
The present paper will present the instrument as well as first results from the flight
Measurement of b-hadron masses
No full textMeasurements of b-hadron masses are performed with the exclusive decay modes B +→J/ψK +, B 0→J/ψK +, B0→J/ψKS0, Bs0→J/ψφ and Λb0→J/ψΛ using an integrated luminosity of 35pb -1 collected in pp collisions at a centre-of-mass energy of 7 TeV by the LHCb experiment. The momentum scale is calibrated with J/ψ→μ +μ - decays and verified to be known to a relative precision of 2 ×10 -4 using other two-body decays. The results are more precise than previous measurements, particularly in the case of the Bs0 and Λb0 masses
Observations of Bºs→ψ(2S)η and Bº(s)→ψ(2S)π+π- decays
No full textFirst observations of the B0s
→ψ(2S)η, B0 →ψ(2S)π
+
π
− and B0s
→ψ(2S)π
+
π
− decays are made
using a dataset corresponding to an integrated luminosity of 1.0 fb−1 collected by the LHCb experiment in
proton–proton collisions at a centre-of-mass energy of
√
s = 7 TeV. The ratios of the branching fractions
of each of the ψ(2S) modes with respect to the corresponding J/ψ decays are
B(B0s
→ψ(2S)η)
÷
B(B0s
→J/ψη)
= 0.83± 0.14 (stat)±0.12 (syst) ±0.02 (B),
;
B(B0→ψ(2S)π
+
π
−
)
÷
B(B0→J/ψπ
+
π
−
)
= 0.56± 0.07 (stat)±0.05 (syst)± 0.01 (B),
;
B(B0s
→ψ(2S)π
+
π
−
)
÷
B(B0s
→J/ψπ
+
π
−
)
= 0.34± 0.04 (stat)±0.03 (syst)± 0.01 (B),
where the third uncertainty corresponds to the uncertainties of the dilepton branching fractions of the J/ψ
and ψ(2S) meson decays
Branching fraction and CP asymmetry of the decays B+→K0Sπ+ and B+→K0SK+
No full textAn analysis of B+ → K0
Sπ+ and B+ → K0
S K+ decays is performed with the LHCb experiment. The pp
collision data used correspond to integrated luminosities of 1 fb−1 and 2 fb−1 collected at centre-ofmass
energies of
√
s = 7 TeV and
√
s = 8 TeV, respectively. The ratio of branching fractions and the
direct CP asymmetries are measured to be B(B+ → K0
S K+
)/B(B+ → K0
Sπ+
) = 0.064 ± 0.009 (stat.) ±
0.004 (syst.), ACP(B+ → K0
Sπ+
) = −0.022 ± 0.025 (stat.) ± 0.010 (syst.) and ACP(B+ → K0
S K+
) =
−0.21 ± 0.14 (stat.) ± 0.01 (syst.). The data sample taken at
√
s = 7 TeV is used to search for
B+
c
→ K0
S K+ decays and results in the upper limit ( fc · B(B+
c
→ K0
S K+
))/( fu · B(B+ → K0
Sπ+
)) <
5.8 × 10−2 at 90% confidence level, where fc and fu denote the hadronisation fractions of a ¯b
quark
into a B+
c or a B+ meson, respectively
Evidence for the decay B0→J/ψω and measurement of the relative branching fractions of meson decays to J/ψη and J/ψη′
No full textFirst evidence of the B 0 → J / ψ ω decay is found and the B s 0 → J / ψ η and B s 0 → J / ψ η ′ decays are studied using a dataset corresponding to an integrated luminosity of 1.0 fb -1 collected by the LHCb experiment in proton-proton collisions at a centre-of-mass energy of sqrt(s) = 7 TeV. The branching fractions of these decays are measured relative to that of the B 0 → J / ψ ρ 0 decay:frac(B (B 0 → J / ψ ω), B (B 0 → J / ψ ρ 0)) = 0.89 ± 0.19 (stat) - 0.13 + 0.07 (syst),frac(B (B s 0 → J / ψ η), B (B 0 → J / ψ ρ 0)) = 14.0 ± 1.2 (stat) - 1.5 + 1.1 (syst) - 1.0 + 1.1 (frac(f d, f s)),frac(B (B s 0 → J / ψ η ′), B (B 0 → J / ψ ρ 0)) = 12.7 ± 1.1 (stat) - 1.3 + 0.5 (syst) - 0.9 + 1.0 (frac(f d, f s)), where the last uncertainty is due to the knowledge of f d / f s, the ratio of b-quark hadronization factors that accounts for the different production rate of B 0 and B s 0 mesons. The ratio of the branching fractions of B s 0 → J / ψ η ′ and B s 0 → J / ψ η decays is measured to befrac(B (B s 0 → J / ψ η ′), B (B s 0 → J / ψ η)) = 0.90 ± 0.09 (stat) - 0.02 + 0.06 (syst)
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