625 research outputs found
Baryon anomaly and strong color fields in Pb+Pb collisions at 2.76A TeV at the CERN Large Hadron Collider
With the HIJING/BBbar v2.0 heavy ion event generator, we explore the
phenomenological consequences of several high parton density dynamical effects
predicted in central Pb+Pb collisions at the Large Hadron Collider (LHC)
energies. These include (1) jet quenching due to parton energy loss (dE/dx),
(2) strangeness and hyperon enhancement due to strong longitudinal color field
(SCF), and (3) enhancement of baryon-to-meson ratios due to baryon-anti-baryon
junctions (JJbar) loops and SCF effects. The saturation/minijet cutoff scale
p0(s)and effective string tension kappa(s,A) are constrained by our previous
analysis of LHC p+p data and recent data on the charged multiplicity for Pb+Pb
collisions reported by the ALICE collaboration. We predict the hadron flavor
dependence (mesons and baryons) of the nuclear modification factor RAA(pT)$ and
emphasize the possibility that the baryon anomaly could persist at the LHC up
to pT=10 GeV, well beyond the range observed in central Au+Au collisions at
RHIC energies.Comment: 25 pages, 8 figures, revtex4, text modifications, added references,
accepted for publication Phys. Rev. C (2011
Out-of-school STEM Program for Students with Visual Impairments: Adaptations and Outcomes During the COVID-19 Pandemic
Although previous research exists on making adaptations for students with visual impairments in online settings, there is limited research on the teaching and learning dynamics of students with visual impairments during the COVID-19 pandemic. Since responses to the pandemic made it difficult for students with visual impairments to participate in educational opportunities that require hands-on experiences, gaps have been identified in gaining access to educational opportunities. The current project was originally planned with programs based on in-person modes, aimed at increasing motivation and awareness of science, technology, engineering, and math of students with visual impairments. Due to limitations of in-person participation, substantial modifications and adaptations were required for the programs to be meaningful and effective when delivered in online environments. It was found that proficiency in the use of technology options, specific instruction and guidance for access of information, and program planning in advance were the three key elements for successful implementation of the programs. This article documents 1) existing research on the impacts of the pandemic, 2) meaningful adaptations and modifications, 3) essential elements for developing online programs in STEM, and 4) identified strategies in program transition for students with visual impairments. Some skills may not be most efficiently taught through online interactions, however participation of family members, careful modifications of existing activities, and sufficient level of technology support allows many skills to be acquired through online learning. Most importantly, strong collaboration of participating team members makes it possible for students with visual impairments to participate equitably in online environments
Do Search for Dibaryonic De - Excitations in Relativistic Nuclear Reactions
Some odd characteristics are observed in the single particle distributions
obtained from interactions at momenta which are
explained as the manifestation of a new mechanism of strangeness production via
dibaryonic de-excitations. A signature of the formation of hadronic and
baryonic clusters is also reported. The di-pionic signals of the dibaryonic
orbital de-excitations are analyzed in the frame of the MIT - bag Model and a
Monte Carlo simulation.The role played by the dibaryonic resonances in
relativistic nuclear collisions could be a significant one.
Key words: Relativistic nuclear interactions negative pions, negative kaons,
di-pions , streamer chamber, dibaryons, MIT - bag model
PACS codes: 25.75.+r,14.40.Aq,14.20.Pt,12.40.AsComment: 17 pages,LATEX, preprint ICTP -243 1993,figures available by reques
Evaluation of Respiratory Muscles Activity by means of Cross Mutual Information Function at Different Levels of Ventilatory Effort
Analysis of respiratory muscles activity is an effective technique for the study of pulmonary diseases such as obstructive
sleep apnea syndrome (OSAS). Respiratory diseases, especially those associated with changes in the mechanical properties of the
respiratory apparatus, are often associated with disruptions of the normally highly coordinated contractions of respiratory muscles.
Due to the complexity of the respiratory control, the assessment of OSAS related dysfunctions by linear methods are not sufficient. Therefore, the objective of this study was the detection of diagnostically
relevant nonlinear complex respiratory mechanisms. Two aims of this work were: 1) to assess coordination of respiratory
muscles contractions through evaluation of interactions between respiratory signals and myographic signals through nonlinear
analysis by means of cross mutual information function (CMIF); 2) to differentiate between functioning of respiratory muscles in
patients with OSAS and in normal subjects. Electromyographic(EMG) and mechanomyographic (MMG) signals were recorded from three respiratory muscles: genioglossus, sternomastoid and diaphragm. Inspiratory pressure and flow were also acquired.
All signals were measured in eight patients with OSAS and eight healthy subjects during an increased respiratory effort while
awake. Several variables were defined and calculated from CMIF in order to describe correlation between signals. The results indicate different nonlinear couplings of respiratory muscles in both populations. This effect is progressively more evident at higher levels of respiratory effort
Parent Involvement and Student Academic Performance: A Multiple Mediational Analysis
Parent involvement in a child's education is consistently found to be positively associated with a child's academic performance. However, there has been little investigation of the mechanisms that explain this association. The present study examines two potential mechanisms of this association: the child's perception of cognitive competence and the quality of the student–teacher relationship. This study used a sample of 158 seven-year-old participants, their mothers, and their teachers. Results indicated a statistically significant association between parent involvement and a child's academic performance, over and above the impact of the child's intelligence. A multiple mediation model indicated that the child's perception of cognitive competence fully mediated the relation between parent involvement and the child's performance on a standardized achievement test. The quality of the student–teacher relationship fully mediated the relation between parent involvement and teacher ratings of the child's classroom academic performance. Limitations, future research directions, and implications for public policy initiatives are discussed
Universal behavior of baryons and mesons' transverse momentum distributions in the framework of percolation of strings
In the framework of percolation of strings, we present predictions for the
and for mesons and baryons and for ratios
at LHC energies.Comment: Presented at "Heavy Ion Collisions at the LHC: last call for
predictions", Geneva Switzerland, May 14th-June 8t
Анестезия плечевого сплетения
Trauma of the upper limbs is the third most common cause of disability among the general world population and the leading cause among young people between the ages of 20 and 40. This “Silent Epidemic of the Modern World” has resulted in an increase in the number of surgical interventions, many complexes, in trauma and orthopedic clinics. It is important for surgeons to make the best choice of the method of anesthesia, which depends on many factors, the nature of injury, the age of the patient, and the maintenance period after surgery, and the anesthesia must be simple and effective with the minimum of risk for the patient. Though general anesthesia is increasingly common, the local anesthesia has a well-defined place, and can significantly reduce the cost of outpatient surgery.Травма верхних конечностей часто ведёт к инвалидности, которая находится на третьем месте в общей патологии, а у молодых лиц 20-40 лет на первом месте. Её ещё называют «скрытой эпидемией современного мира». Это привело к увеличению числа хирургических вмешательств в клиниках травматологии и ортопедии. Большинство таких операций характеризуются сложностью выполнения. Здесь особую роль играют методы анестезии, которые зависят от многих факторов: характера травмы, возраста пациента, ведения послеоперационного периода. В то же время анестезия должна быть простой, эффективной и с меньшим риском для пациента. Несмотря на то, что методы общей анестезии продолжают разрабатываться, местная анестезия тоже имеет своё определённое место. Некоторые преимущества локальной анестезии, в сравнении с общей, приводят к существенному снижению стоимости амбулаторной хирургии
Boundary breathers in the sinh-Gordon model
We present an investigation of the boundary breather states of the
sinh-Gordon model restricted to a half-line. The classical boundary breathers
are presented for a two parameter family of integrable boundary conditions.
Restricting to the case of boundary conditions which preserve the \phi -->
-\phi symmetry of the bulk theory, the energy spectrum of the boundary states
is computed in two ways: firstly, by using the bootstrap technique and
subsequently, by using a WKB approximation. Requiring that the two descriptions
of the spectrum agree with each other allows a determination of the
relationship between the boundary parameter, the bulk coupling constant, and
the parameter appearing in the reflection factor derived by Ghoshal to describe
the scattering of the sinh-Gordon particle from the boundary.Comment: 16 pages amslate
Predictions for Pb Collisions at TeV: Comparison with Data
Predictions made in Albacete {\it et al} prior to the LHC Pb run at
TeV are compared to currently available data. Some
predictions shown here have been updated by including the same experimental
cuts as the data. Some additional predictions are also presented, especially
for quarkonia, that were provided to the experiments before the data were made
public but were too late for the original publication are also shown here.Comment: 55 pages 35 figure
Impaired decisional impulsivity in pathological videogamers
Abstract
Background
Pathological gaming is an emerging and poorly understood problem. Impulsivity is commonly impaired in disorders of behavioural and substance addiction, hence we sought to systematically investigate the different subtypes of decisional and motor impulsivity in a well-defined pathological gaming cohort.
Methods
Fifty-two pathological gaming subjects and age-, gender- and IQ-matched healthy volunteers were tested on decisional impulsivity (Information Sampling Task testing reflection impulsivity and delay discounting questionnaire testing impulsive choice), and motor impulsivity (Stop Signal Task testing motor response inhibition, and the premature responding task). We used stringent diagnostic criteria highlighting functional impairment.
Results
In the Information Sampling Task, pathological gaming participants sampled less evidence prior to making a decision and scored fewer points compared with healthy volunteers. Gaming severity was also negatively correlated with evidence gathered and positively correlated with sampling error and points acquired. In the delay discounting task, pathological gamers made more impulsive choices, preferring smaller immediate over larger delayed rewards. Pathological gamers made more premature responses related to comorbid nicotine use. Greater number of hours played also correlated with a Motivational Index. Greater frequency of role playing games was associated with impaired motor response inhibition and strategy games with faster Go reaction time.
Conclusions
We show that pathological gaming is associated with impaired decisional impulsivity with negative consequences in task performance. Decisional impulsivity may be a potential target in therapeutic management
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