43,944 research outputs found
[Letter to J. G. O'Rielly Regarding Firefighting - October 15, 1943]
No full textLetter to J. G. O'Rielly of W. S. Darley & Company discussing the champion type "H" pump and an enclosed list of fire chiefs located throughout the Middle East. The author of this letter recommends that Mr. Rielly send photographs and the highest pressure recorded on this pump to Captain James C. Thompson
A Monte Carlo simulation study to investigate the potential of diffraction enhanced breast imaging
No full textRecent studies have demonstrated that image contrast in X-ray mammography could be enhanced by making use of both the transmitted and scattered radiation. At small angles coherently scattered photons undergo interference effects which can be used as a means of tissue characterisation. Several form factor data from X-ray diffraction measurements are now available. The authors implemented these data in the EGS4 code so as to use realistic breast tissues (both tumour and healthy tissue) for a Monte Carlo simulation. A breast imaging system which makes use of a combined scatter/transmission signal has been modelled. Results of the authors' simulation confirmed that the contrast between healthy and tumour tissue provided by small-angle scatter radiation is greater than that of primary image for object thicknesses of mammographic interest. Analysis of beam polychromaticity effects in coherent scattering showed that material discrimination is still possible with the conventional X-ray sources currently used. In the design of a diffraction enhanced breast imaging system signal-to-noise ratio performance must be considered in order to fully assess the increase in diagnostic capability effected by this approach
Measurement of the ratio of prompt χ c to J / ψ production in pp collisions at √s = 7 TeV
No full textThe prompt production of charmonium χ c and J / ψ states is studied in proton-proton collisions at a centre-of-mass energy of √s = 7 TeV at the Large Hadron Collider. The χ c and J / ψ mesons are identified through their decays χ c → J / ψ γ and J / ψ → μ + μ - using 36 pb - 1 of data collected by the LHCb detector in 2010. The ratio of the prompt production cross-sections for χ c and J / ψ, σ (χ c → J / ψ γ) / σ (J / ψ), is determined as a function of the J / ψ transverse momentum in the range 2 < p T J / ψ < 15 GeV / c. The results are in excellent agreement with next-to-leading order non-relativistic expectations and show a significant discrepancy compared with the colour singlet model prediction at leading order, especially in the low p T J / ψ region
Imaginary Intimacies: Death and New Temporalities in the Work of Denise Riley and Nicholas Royle
No full textIn The Severed Head: Capital Visions (2014), Julia Kristeva understands there to be two forms of relation to death in contemporary culture. The ‘imaginary intimacy with death, which transforms melancholy or desire into representation and thought’ is opposed in Kristeva’s work to ‘the rational realization’ of the act of capital punishment, the former epitomizing ‘vision’ in contrast to the ‘action’ of the latter. This essay proposes that Kristeva’s idea of an ‘imaginary intimacy’ with death can be read in the context of contemporary literary responses to the death of a loved one by Denise Riley and Nicholas Royle. In particular, this essay addresses the relationship between death and new temporalities in Riley’s essay Time Lived, Without Its Flow (2012), her recent collection of poems Say Something Back (2016), and Royle’s Quilt (2010). The non-linear models of time found in Riley’s and Royle’s works are contextualised via the attempts in phenomenology to theorise the relations between temporality and finitude, as well as via Stephen J Gould’s work on geological time. For Riley, the experience of the death of her son brings with it an ‘altered condition of life’ in which time takes the form of ‘a-temporality.’ Questioning the limits of the sentence, and collapsing the narrative boundaries between the living narrator and the deceased father, Quilt traverses the boundaries between experience lived and an experience impossible to claim. Through such an analysis the essay explores the capacity of experimental works to harbour new non-linear temporalities that reflect on the relation between temporality and finitude in the contemporary
High resolution Ca/P maps ofbone architecture in 3Dsynchrotron radiation microtomographic images
No full textEvidence 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)
Proposal of a Novel Diffraction-Enhanced Imaging Setup Based on Polycapillary X-Ray Optics
No full textCDROM-M10-196
INF
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
CLARIFYING THE NOMENCLATURE AND TAXONOMY OF GAGEA KUNAWURENSIS (ROYLE) GREUTER (LILIACEAE) AND ALLIED TAXA
No full textStudy of relevant types has led to the conclusion that Gagea kunawurensis (Royle) Greuter (Liliaceae) is the correct name for what has recently been known as G. stipitata Merckl. ex Bunge; that G. gageoides (Zucc.) Vved. is the correct name for G. persica Boiss., and that G. kashmirensis Turrill should be reduced to synonymy of G. tenera Pascher. Anatomical and morphological data are presented for these and the related species Gagea dschungarica Regel and G. afghanica A.Terracc., and a key given to allow their discrimination.</jats:p
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