1,900 research outputs found
The effect of mother plant nutrition on seed yield, quality and vigour in peas (Pisum sativum)
SIGLEAvailable from British Library Document Supply Centre- DSC:DX86025 / BLDSC - British Library Document Supply CentreGBUnited Kingdo
LEECH’S POLITENESS MAXIMS AND THEIR HIERARCHY IN HINDI AND PERSIAN: A PRAGMATIC STUDY OF POLITENESS / LES MAXIMES DE POLITESSE DE LEECH ET LE URHIÉRARCHIE EN HINDI ET EN PERSAN: UNE ÉTUDE PRAGMATIQUE DE LA POLITESSE
The paper is concerned with some aspects of politeness in the request act by the pragmatic connotations of syntactic structures in Hindi and Persian. Considering the role of politeness as an explanation for the deviation from the Grice’s cooperative principle, the main question of the paper is whether Leech’s maxims of politeness operate on the syntagmatic and paradigmatic relations and whether there is any hierarchy in their manner of application. To answer the abovementioned question the main hypothesis of the research posits that Leech’s maxims of politeness have a structure of hierarchy in both Persian and Hindi. Considering the Pandharipandes' (1979) hierarchy of the degree of politeness proposed for Hindi, this paper aims to develop a similar hierarchy of the degree of politeness for Persian and to analyze the Leech’s maxims operating in the respective hierarchies of politeness. The general theoretical framework adopted for the present study is based on Lakoff (1972), and Leech (1980). Whereas the findings of this research indicate a hierarchy in Hindi and Persian at the syntagmatic planewith regard to their respective Leech’s maxims,no such hierarchyis detectable for paradigmatic relationwhichholds good for all types of social situations
Beam tests of a large-scale TORCH time-of-flight demonstrator
The TORCH time-of-flight detector is designed to provide particle
identification in the momentum range 2-10 GeV/c over large areas. The detector
exploits prompt Cherenkov light produced by charged particles traversing a 10
mm thick quartz plate. The photons propagate via total internal reflection and
are focused onto a detector plane comprising position-sensitive Micro-Channel
Plate Photo-Multiplier Tubes (MCP-PMT) detectors. The goal is to achieve a
single-photon timing resolution of 70 ps, giving a timing precision of 15 ps
per charged particle by combining the information from around 30 detected
photons. The MCP-PMT detectors have been developed with a commercial partner
(Photek Ltd, UK), leading to the delivery of a square tube of active area 53
53mm with a granularity of 8 128 pixels equivalent. A
large-scale demonstrator of TORCH, having a quartz plate of dimensions 660
1250 10 mm and read out by a pair of MCP-PMTs with custom
readout electronics, has been verified in a test beam campaign at the CERN PS.
Preliminary results indicate that the required performance is close to being
achieved. The anticipated performance of a full-scale TORCH detector at the
LHCb experiment is presented.Comment: 12 pages, 7 figures, Paper submitted to Nuclear Instruments & Methods
in Physics Research, Section A - Special Issue VCI 201
Status of the TORCH time-of-flight project
TORCH is a time-of-flight detector, designed to provide charged pi/K particle
identification up to a momentum of 10 GeV/c for a 10 m flight path. To achieve
this level of performance, a time resolution of 15 ps per incident particle is
required. TORCH uses a plane of quartz of 1 cm thickness as a source of
Cherenkov photons, which are then focussed onto square Micro-Channel Plate
Photomultipliers (MCP-PMTs) of active area 53 x 53 mm^2, segmented into 8 x 128
pixels equivalent. A small-scale TORCH demonstrator with a customised MCP-PMT
and associated readout electronics has been successfully operated in a 5 GeV/c
mixed pion/proton beam at the CERN PS facility. Preliminary results indicate
that a single-photon resolution better than 100 ps can be achieved. The
expected performance of a full-scale TORCH detector for the Upgrade II of the
LHCb experiment is also discussed.Comment: 9 pages, 6 figures, Paper submitted to Nuclear and Methods A :
Proceedings of the 10th International Workshop on Ring Imaging Cherenkov
Detectors (RICH 2018), Moscow, Russia, July 29 to August 4 201
Measurement of the mass and lifetime of the baryon
A proton-proton collision data sample, corresponding to an integrated
luminosity of 3 fb collected by LHCb at and 8 TeV, is used
to reconstruct , decays. Using the , decay mode for calibration, the lifetime ratio and absolute
lifetime of the baryon are measured to be \begin{align*}
\frac{\tau_{\Omega_b^-}}{\tau_{\Xi_b^-}} &= 1.11\pm0.16\pm0.03, \\
\tau_{\Omega_b^-} &= 1.78\pm0.26\pm0.05\pm0.06~{\rm ps}, \end{align*} where the
uncertainties are statistical, systematic and from the calibration mode (for
only). A measurement is also made of the mass difference,
, and the corresponding mass, which
yields \begin{align*} m_{\Omega_b^-}-m_{\Xi_b^-} &= 247.4\pm3.2\pm0.5~{\rm
MeV}/c^2, \\ m_{\Omega_b^-} &= 6045.1\pm3.2\pm 0.5\pm0.6~{\rm MeV}/c^2.
\end{align*} These results are consistent with previous measurements.Comment: 11 pages, 5 figures, All figures and tables, along with any
supplementary material and additional information, are available at
https://lhcbproject.web.cern.ch/lhcbproject/Publications/LHCbProjectPublic/LHCb-PAPER-2016-008.htm
Model-independent evidence for contributions to decays
The data sample of decays acquired with the
LHCb detector from 7 and 8~TeV collisions, corresponding to an integrated
luminosity of 3 fb, is inspected for the presence of or
contributions with minimal assumptions about
contributions. It is demonstrated at more than 9 standard deviations that
decays cannot be described with
contributions alone, and that contributions play a dominant role in
this incompatibility. These model-independent results support the previously
obtained model-dependent evidence for charmonium-pentaquark
states in the same data sample.Comment: 21 pages, 12 figures (including the supplemental section added at the
end
Observation of an Excited Bc+ State
Using pp collision data corresponding to an integrated luminosity of 8.5 fb-1 recorded by the LHCb experiment at center-of-mass energies of s=7, 8, and 13 TeV, the observation of an excited Bc+ state in the Bc+π+π- invariant-mass spectrum is reported. The observed peak has a mass of 6841.2±0.6(stat)±0.1(syst)±0.8(Bc+) MeV/c2, where the last uncertainty is due to the limited knowledge of the Bc+ mass. It is consistent with expectations of the Bc∗(2S31)+ state reconstructed without the low-energy photon from the Bc∗(1S31)+→Bc+γ decay following Bc∗(2S31)+→Bc∗(1S31)+π+π-. A second state is seen with a global (local) statistical significance of 2.2σ (3.2σ) and a mass of 6872.1±1.3(stat)±0.1(syst)±0.8(Bc+) MeV/c2, and is consistent with the Bc(2S10)+ state. These mass measurements are the most precise to date
Study of decays to the final state and evidence for the decay
A study of decays is performed for the first time
using data corresponding to an integrated luminosity of 3.0
collected by the LHCb experiment in collisions at centre-of-mass energies
of and TeV. Evidence for the decay
is reported with a significance of 4.0 standard deviations, resulting in the
measurement of
to
be .
Here denotes a branching fraction while and
are the production cross-sections for and mesons.
An indication of weak annihilation is found for the region
, with a significance of
2.4 standard deviations.Comment: All figures and tables, along with any supplementary material and
additional information, are available at
https://lhcbproject.web.cern.ch/lhcbproject/Publications/LHCbProjectPublic/LHCb-PAPER-2016-022.html,
link to supplemental material inserted in the reference
Observation of resonances consistent with pentaquark states in decays
Observations of exotic structures in the channel, that we refer to
as pentaquark-charmonium states, in decays are
presented. The data sample corresponds to an integrated luminosity of 3/fb
acquired with the LHCb detector from 7 and 8 TeV pp collisions. An amplitude
analysis is performed on the three-body final-state that reproduces the
two-body mass and angular distributions. To obtain a satisfactory fit of the
structures seen in the mass spectrum, it is necessary to include two
Breit-Wigner amplitudes that each describe a resonant state. The significance
of each of these resonances is more than 9 standard deviations. One has a mass
of MeV and a width of MeV, while the second
is narrower, with a mass of MeV and a width of MeV. The preferred assignments are of opposite parity, with one
state having spin 3/2 and the other 5/2.Comment: 48 pages, 18 figures including the supplementary material, v2 after
referee's comments, now 19 figure
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