7,098 research outputs found
Predictions for dijet production in DIS using small x dynamics
We study the properties of dijet production in deep inelastic scattering
using a unified BFKL/DGLAP framework, which includes important subleading ln
(1/x) contributions. We calculate the azimuthal decorrelation between the jets.
We compute the cross section for dijet production as a function of Q^2 and the
jet transverse momentum, as well as calculate the total dijet rate. We compare
the predictions with HERA data.Comment: 7 pages, LaTeX with 4 eps figure
CaracterÃsticas Antropométricas en Atletas de Jiu Jitsu Brasilero de Alto Nivel: Rol del Estilo de Lucha
Indexación: Web of Science; Scielo.SUMMARY: Human performance efficiency and effectiveness in different sports depend to a large extent on the size, weight and proportion of the physique of the athlete. The aim of this study was to identify morphological characteristics of Brazilian Jiu-Jitsu (BJJ) athletes. The sample consisted of 25 highly trained male athletes who were classified according to their fighting style; guard fighter (GF) vs. pass fighter (PF). The athletes were assessed for somatotype, body composition and proportionality. For the whole group of athletes the somatotype was 2.23±0.68, 6.33±1.14, and 1.75±0.87 for endomorph, mesomorph and ectomorph components, respectively. Muscle and adipose tissue percentages were 52.34±2.15% and 19.30±2.51%, respectively. PF were significantly more mesomorph (p< 0.05) and less ectomorph (p< 0.05) than GF. Also, PF had significantly higher phantom Z score for bone mass vs. GF (0.51±0.57 vs. 0.01±0.54; p<0.05), and significantly lower muscle mass- bone mass ratio (4.55±0.31 vs. 4.77±0.56; p<0.05), height (1.71±0.06 vs. 1.77±0.07; p<0.05) and height weight ratio (40.58±1.11 vs. 41.84±1.22). Our results show that morphological characteristics are related to different fighting styles in BJJ athletes.RESUMEN: La eficiencia y efectividad del rendimiento humano en diferentes deportes depende en gran medida del tamaño, peso y proporción del fÃsico del atleta. El objetivo de este estudio fue identificar las caracterÃsticas morfológicas de atletas jiu-jitsu brasileros. La muestra consintió de 25 atletas varones altamente entrenados, quienes fueron clasificados de acuerdo a su estilo de lucha; guarderos (GF) vs pasadores (PF). Se evaluó en los atletas somatotipo, composición corporal y proporcionalidad. Para el grupo total de atletas el somatotipo fue 2,23±0,68, 6,33±1,14 y 1,75±0,78 para el endomorfismo, mesomorfismo y ectomorfismo, respectivamente. Los porcentajes de tejido muscular y adiposo fueron 52,34±2,15% and 19,30±2,51%, respectivamente. PF fueron significativamente las mesomorfos (p<0,05) y menos ectomorfos (p<0,05) que GF. Además PF tuvieron una significativamente alto Z score para la masa ósea (4,55±0,31 vs. 4,77±0,56; p<0,05), estatura (1,71±0,06 vs. 1,77±0,07; p<0,05) y relación altura peso (40,58±1.11 vs. 41,84±1.22). Nuestros resultados muestran que las caracterÃsticas morfológicas están relacionadas a diferentes estilos de lucha en atletas de BJJ.http://ref.scielo.org/bzhxy
Self-interaction chromatography as a tool for optimizing conditions for membrane protein crystallization
The second virial coefficient, or B value, is a measurement of how well a protein interacts with itself in solution. These interactions can lead to protein crystallization or precipitation, depending on their strength, with a narrow range of B values (the `crystallization slot') being known to promote crystallization. A convenient method of determining the B value is by self-interaction chromatography. This paper describes how the light-harvesting complex 1-reaction centre core complex from Allochromatium vinosum yielded single straight-edged crystals after iterative cycles of self-interaction chromatography and crystallization. This process allowed the rapid screening of small molecules and detergents as crystallization additives. Here, a description is given of how self-interaction chromatography has been utilized to improve the crystallization conditions of a membrane protein
Properties of HERA Events from DIS on Pions in the Proton
Recently the concept of the pion cloud in the nucleon turned out to be
successful in understanding the Gottfried sum rule violation observed by the
New Muon Collaboration and the Drell--Yan asymmetry measured in NA51 at CERN.
We propose a further possibility to test this concept at HERA through the
analysis of the structure of deep inelastic scattering (DIS) events induced by
pion--exchange. Momentum and energy distributions of outgoing nucleons as well
as rapidity and multiplicity distributions are investigated using Monte Carlo
simulations. Most observables cannot distinguish this process from ordinary
DIS, but in the energy distribution of final neutrons we find a significantly
different prediction from the pion cloud model. Forward neutron calorimeters
will be essential to test the concept of pions in the nucleon.Comment: LaTeX file and gziped tar file with eps figures, 14 page
Mapping the proton unintegrated gluon distribution in dijets correlations in real and virtual photoproduction at HERA
We discuss how the dijet azimuthal correlations in DIS and real
photoproduction at HERA probe the differential (unintegrated) gluon
distribution in the proton. We find a strong dependence of the azimuthal
correlation pattern on Bjorken-, photon virtuality and the cut on the jet
transverse momenta. A rise of the azimuthal decorrelations is observed with
decreasing Bjorken-x due to the interplay of perturbative and nonperturbative
effects. We predict a strong rise of the same-side jet rate with photon energy
for real photoproduction. We discuss conditions for the correlation function to
be dominated by hard perturbative gluons and ways of constraining the size of
the nonperturbative soft component. We make some predictions for the THERA
energy range. The analysis of the energy dependence of the isolated jet and
two-jet cross sections in photoproduction would be a new way to study the not
yet well constrained unintegrated gluon distributions and to explore the onset
of the pQCD regime.Comment: 16 pp, 8 eps-fig
Fragmentation in DIS
The fragmentation properties in deep-inelastic scattering (DIS) at HERA are
investigated in order to test perturbative QCD and quark fragmentation
universality. Selected results for the inclusive single particle distributions
and the angular two-particle correlations in the current region of the Breit
frame are presented and compared to results from collisions. The
extension of the DIS fragmentation studies to the target region of the Breit
frame are also reported.Comment: 3 pages, 4 figures, Proc. of the 7th Int. Workshop on Deep Inelastic
Scattering and QCD (DIS99), Zeuthen, Germany, April 19-23, 1999, to appear in
Nucl. Phys. B (Proc. Suppl.
Dexrazoxane decreases the cardiotoxic effects of doxorubicin in osteosarcoma patients without increasing mortality from secondary malignant neoplasms
A clinical decision report appraising:
Schwartz CL, Wexler LH, Krailo MD, et al. Intensified chemotherapy with dexrazoxane cardioprotection in newly diagnosed nonmetastatic osteosarcoma: A report from the Children’s Oncology Group. Pediatr Blood Cancer. 2016;63(1):54-615. https://doi.org/10.1002/pbc.25753
for a patient with osteosarcoma and concerns about the risk of secondary malignant neoplasms that attend use of dexarazoxane
Análisis del predominio de las técnicas utilizadas en las rondas finales de competencias internacionales de judo puntuables para el ranking olÃmpico: un enfoque biomecánico
Judo is an Olympic combat sport that is divided into male and female weight categories. Each weight category implies significant differences in technical and strategic dimensions, as well as physiological, performance, and body composition among competitors. This individual variability can widely mark options and predominance of biomechanical actions inherent to its own movements. This study aimed to determine the technical actions predominance used by judokas in the international competitions final stages scoring for the Olympic ranking. We observed 285 judo matches, in several weight categories for men and women, played in the final stages of six scoring international competitions for the Olympic ranking in Tokyo 2021. An observation system was used according to the biomechanical classification of judo techniques proposed by Sacripanti. In Nage-Waza combat, there was a predominance of lever techniques over couple techniques. In Ne-Waza there was a predominance of pressure techniques, followed by venous breathing block and dislocation of the elbow joint. There were also differences between genders and significant associations by weight category in the technical options in combat, as well as according to the combat phase.El judo es un deporte de combate olÃmpico que se divide en categorÃas de peso masculino y femenino. Cada categorÃa de peso implica diferencias significativas en las dimensiones técnicas y estratégicas, asà como fisiológicas, de rendimiento y de composición corporal entre los competidores. Esta variabilidad individual puede marcar ampliamente opciones y predominio de acciones biomecánicas inherentes a sus propios movimientos.
Este estudio tuvo como objetivo determinar el predominio de las acciones técnicas utilizadas por los judokas en las etapas finales de las competencias internacionales puntuables para el ranking olÃmpico. Observamos 285 combates de judo, en varias categorÃas de peso para hombres y mujeres, disputados en las etapas finales de seis competencias internacionales puntuables para el ranking olÃmpico en Tokio 2021. Se utilizó un sistema de observación de acuerdo con la clasificación biomecánica de técnicas de judo propuesta por Sacripanti. En el combate Nage-Waza predominaban las técnicas de palanca sobre las técnicas de binario. En Ne-Waza predominaron las técnicas de presión, seguidas del bloqueo respiratorio venoso y la luxación de la articulación del codo. También hubo diferencias entre géneros y asociaciones significativas por categorÃa de peso en las opciones técnicas en combate, asà como según la fase de combate.info:eu-repo/semantics/publishedVersio
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