Search results for "parto"
showing 10 items of 608 documents
The Quest for Raw Materials in the British Paper Trade : The Development of the Bamboo Pulp and Paper Industry in British India up to 1939
2018
The British paper trade history was defined since the mid-1850s by a quest for a new raw material to replace rags. The requirements of the paper trade were first met by a discovery that esparto grass from Spain, and later from North Africa, could be utilised in British mills. Beginning in the late 1870s, the success of using esparto encouraged mill developments in British India. The increased dependence on imported wood pulp, the likelihood of a pulp famine, and the consequent increase in price for imported wood pulp drew attention to the possibility of making commercial volumes of good quality pulp from indigenous Indian grasses. Bamboo began being treated after the First World War, when t…
Charged particle multiplicity distributions in restricted rapidity intervals in Z0 hadronic decays.
1991
The multiplicity distributions of charged particles in restricted rapidity intervals in Z0 hadronic decays measured by the DELPHI detector are presented. The data reveal a shoulder structure, best visible for intervals of intermediate size, i.e. for rapidity limits around ±1.5. The whole set of distributions including the shoulder structure is reproduced by the Lund Parton Shower model. The structure is found to be due to important contributions from 3-and 4-jet events with a hard gluon jet. A different model, based on the concept of independently produced groups of particles, "clans", fluctuating both in number per event and particle content per clan, has also been used to analyse the pres…
Nucleon structure functions and light front dynamics
1999
We present a quark-parton model to describe polarized and unpolarized nucleon structure functions. The twist-two matrix elements for the QCD evolution analysis of lepton-hadron scattering are calculated within a light-front covariant quark model. The relativistic effects in the three-body wave function are discussed for both the polarized and unpolarized cases. Predictions are given for the polarized gluon distributions as will be seen in future experiments.
Aav-based gene therapy approaches for the treatment of canavan disease
2013
Background: The enzyme Aspartoacylase (ASPA) is normally expressed in oligodendrocytes, the myelin-forming cells in the central nervous system (CNS). ASPA gene mutations cause Canavan Disease (CD), a devastating neurological disorder characterized by psychomotor retardation, and spongiform degeneration of central white matter in affected children. The lack of ASPA leads to the enrichment in its substrate N-acetyl aspartate (NAA) which is a biomarker of CD. With no available treatment and a pathology restricted to the CNS CD has been trialled by gene therapy. However, gene replacement approaches using neurotropic recombinant adeno-associated viral (rAAV) vectors have proved unsuccessful. It …
Somnolencia y fatiga materna en los primeros años de crianza y ejecución en la conducción evaluada en simulador
2017
RESUMEN DE LA TESIS DOCTORAL Somnolencia y fatiga materna en los primeros años de crianza y ejecución en la conducción evaluada en simulador El nacimiento de un bebé y la crianza posterior durante la primera infancia supone un considerable esfuerzo para madres y padres, que provoca cambios profundos en la familia, tanto si se trata del primer hijo/a como de la incorporación de un nuevo miembro más a la familia. Un bebé recién nacido necesita atención constante por parte de sus cuidadores, y los padres deben responder a las intensas demandas de cuidado que requiere, sobre todo porque el bebé no tiene un ritmo circadiano establecido, su sueño se distribuye a lo largo del día y de la noche en …
The SISCone jet algorithm optimised for low particle multiplicities
2011
The SISCone jet algorithm is a seedless infrared-safe cone jet algorithm. There exists an implementation which is highly optimised for a large number of final state particles. However, in fixed-order perturbative calculations with a small number of final state particles, it turns out that the computer time needed for the jet clustering of this implementation is comparable to the computer time of the matrix elements. This article reports on an implementation of the SISCone algorithm optimised for low particle multiplicities.
Enhancement of charm quark production due to nonlinear corrections to the DGLAP equations
2004
We have studied how parton distributions based on the inclusion of nonlinear scale evolution and constraints from HERA data affect charm production in $pp$ collisions at center-of-mass energies of 5.5, 8.8 and 14 TeV. We find that, while the resulting enhancement can be substantial, it is very sensitive to the charm quark mass and the scale entering the parton densities and the strong coupling constant.
Measurement of dijet production with a veto on additional central jet activity in pp collisions at sqrt(s)=7 TeV using the ATLAS detector
2011
A measurement of jet activity in the rapidity interval bounded by a dijet system is presented. Events are vetoed if a jet with transverse momentum greater than 20 GeV is found between the two boundary jets. The fraction of dijet events that survive the jet veto is presented for boundary jets that are separated by up to six units of rapidity and with mean transverse momentum 50 < p¯T < 500 GeV. The mean multiplicity of jets above the veto scale in the rapidity interval bounded by the dijet system is also presented as an alternative method for quantifying perturbative QCD emission. The data are compared to a next-to-leading order plus parton shower prediction from the powheg-box, an all-order…
Satisfacción de las mujeres con la experiencia del parto: validación de la Mackey Satisfaction Childbirth Rating Scale
2012
ResumenObjetivosDeterminar la fiabilidad y validez de contenido y concepto de la Mackey Childbirth Satisfaction Rating Scale, escala para medir la satisfacción de las mujeres con el parto y el nacimiento.MétodosSe utilizó el método de traducción-retrotraducción para obtener una versión adaptada de la escala. Para la validación se seleccionó una muestra de 325 mujeres que habían tenido un hijo sano mediante parto vaginal. La recogida de datos se realizó con un cuestionario autocumplimentado que incluía la escala adaptada, expectativas ante el parto y variables obstétricas y sociodemográficas. Se valoró la fiabilidad en una submuestra de 45 mujeres que cumplimentaron de nuevo la escala a los …
First Measurement of Transverse-Spin-Dependent Azimuthal Asymmetries in the Drell-Yan Process
2017
The first measurement of transverse-spin-dependent azimuthal asymmetries in the pion-induced Drell-Yan (DY) process is reported. We use the CERN SPS 190 GeV/$c$, $\pi^{-}$ beam and a transversely polarized ammonia target. Three azimuthal asymmetries giving access to different transverse-momentum-dependent (TMD) parton distribution functions (PDFs) are extracted using dimuon events with invariant mass between 4.3 GeV/$c^2$ and 8.5 GeV/$c^2$. The observed sign of the Sivers asymmetry is found to be consistent with the fundamental prediction of Quantum Chromodynamics (QCD) that the Sivers TMD PDFs extracted from DY have a sign opposite to the one extracted from semi-inclusive deep-inelastic sc…