196 research outputs found
¿Existe relación entre los factores afectivos en las matemáticas y el rendimiento académico en educación primaria?
Este trabajo, pretende analizar y describir
la importancia que desempeñan los factores afectivos
(emociones, creencias y actitudes) en el aprendizaje
de las matemáticas. Se presentan los resultados de un
estudio realizado con 384 alumnos del tercer ciclo de
Educación Primaria, con edades comprendidas entre
los 10 y 12 años para evaluar los aspectos afectivos hacia
la materia en relación con el rendimiento académico.
Entre las seis dimensiones que contempla el
cuestionario, el autoconcepto matemático, las creencias
acerca de su destreza matemática y las atribuciones
de causalidad sobre dicha materia presentan mayores
niveles de significatividad con las calificaciones.
El estudio muestra que estos factores y el rendimiento
académico están correlacionados acentuando la necesidad
de otorgar un papel más destacado a los componentes
afectivos para mejorar la calidad de la matemática
Hyperbolic limit on the early arrival time of bright pulses from PSR~J08354510 (Vela)
Astronomers have studied the Vela pulsar (PSR~J08354510) for decades. This
study analyses almost one hundred hours of single-pulse data collected over
three consecutive days from 2016 and 2020. The work investigates the
fascinating phenomena of the earlier arrival of brighter pulses with their
increase in peak intensity. We found a hyperbolic relation between them by
constructing integrated pulse profiles using flux density intervals and
examining the relationship between pulse arrival time and intensity. We
identified a phase limit of ~ms for the earliest arrival of
the brightest pulses. This study offers exciting prospects for further
exploring the emission regions responsible for the Vela pulsar's regular and
giant micro-pulses.Comment: 9 pages, 11 figure
Phase Transitions in Two-Dimensional Traffic Flow Models
We introduce two simple two-dimensional lattice models to study traffic flow
in cities. We have found that a few basic elements give rise to the
characteristic phase diagram of a first-order phase transition from a freely
moving phase to a jammed state, with a critical point. The jammed phase
presents new transitions corresponding to structural transformations of the
jam. We discuss their relevance in the infinite size limit.Comment: RevTeX 3.0 file. Figures available upon request to e-address
[email protected] (or 'dopico' or 'molera' or 'anxo', same node
Two-dimensional cellular automaton model of traffic flow with open boundaries
A two-dimensional cellular automaton model of traffic flow with open
boundaries are investigated by computer simulations. The outflow of cars from
the system and the average velocity are investigated. The time sequences of the
outflow and average velocity have flicker noises in a jamming phase. The low
density behavior are discussed with simple jam-free approximation.Comment: 14 pages, Phys. Rev. E in press, PostScript figures available at
ftp://hirose.ai.is.saga-u.ac.jp/pub/documents/papers/1996/2DTR/
OpenBoundaries/Figs.tar.g
The use of micro-XRD for the study of glaze color decorations
The compounds responsible for the colours and decorations in glass and glazed ceramics include:
colouring agents (transition metal ions), pigments (micro-and nano-precipitates of compounds
that either do not dissolve or recrystallize in the glassy matrix) and opacifiers (microcrystalline
compounds with high light scattering capability). Their composition, structure and range of
stability are highly dependent not only on the composition but also on the procedures followed to
obtain them. Chemical composition of the colorants and crystallites may be obtained by means of
SEM-EDX and WDX. Synchrotron Radiation micro-X-ray Diffraction has a small beam size
adequate (10 to 50 microns footprint size) to obtain the structural information of crystalline
compounds and high brilliance, optimal for determining the crystallites even when present in low
amounts. In addition, in glass decorations the crystallites often appear forming thin layers (from
10 to 100 micrometers thick) and they show a depth dependent composition and crystal structure.
Their nature and distribution across the glass/glazes decorations gives direct information on the
technology of production and stability and may be related to the color and appearance.
A selection of glass and glaze coloring agents and decorations are studied by means of SR-micro-
XRD and SEM-EDX including: manganese brown, antimony yellow, red copper lusters and cobalt
blue. The selection includes Medieval (Islamic, and Hispano Moresque) and renaissance tin
glazed ceramics from the 10th to the 17th century AD
Search for a standard model-like Higgs boson in the μ+ μ- and e+ e- decay channels at the LHC
A search is presented for a standard model-like Higgs boson decaying to the μ+μ− or e+e− final
states based on proton–proton collisions recorded by the CMS experiment at the CERN LHC. The data
correspond to integrated luminosities of 5.0 fb−1 at a centre-of-mass energy of 7 TeV and 19.7 fb−1 at
8 TeV for the μ+μ− search, and of 19.7 fb−1 at 8 TeV for the e+e− search. Upper limits on the production
cross section times branching fraction at the 95% confidence level are reported for Higgs boson masses
in the range from 120 to 150 GeV. For a Higgs boson with a mass of 125 GeV decaying to μ+μ−, the
observed (expected) upper limit on the production rate is found to be 7.4 (6.5+2.8
−1.9) times the standard
model value. This corresponds to an upper limit on the branching fraction of 0.0016. Similarly, for e+e−,
an upper limit of 0.0019 is placed on the branching fraction, which is ≈3.7 × 105 times the standard
model value. These results, together with recent evidence of the 125 GeV boson coupling to τ -leptons
with a larger branching fraction consistent with the standard model, confirm that the leptonic couplings
of the new boson are not flavour-universalWe congratulate our colleagues in the CERN accelerator departments
for the excellent performance of the LHC and thank the
technical and administrative staffs at CERN and at other CMS institutes
for their contributions to the success of the CMS effort.
In addition, we gratefully acknowledge the computing centres and
personnel of the Worldwide LHC Computing Grid for delivering so
effectively the computing infrastructure essential to our analyses.
Finally, we acknowledge the enduring support for the construction
and operation of the LHC and the CMS detector provided by
the following funding agencies: BMWFW and FWF (Austria); FNRS
and FWO (Belgium); CNPq, CAPES, FAPERJ, and FAPESP (Brazil);
MES (Bulgaria); CERN; CAS, MoST, and NSFC (China); COLCIENCIAS
(Colombia); MSES and CSF (Croatia); RPF (Cyprus); MoER, ERC IUT
and ERDF (Estonia); Academy of Finland, MEC, and HIP (Finland);
CEA and CNRS/IN2P3 (France); BMBF, DFG, and HGF (Germany);
GSRT (Greece); OTKA and NIH (Hungary); DAE and DST (India);
IPM (Iran); SFI (Ireland); INFN (Italy); NRF and WCU (Republic
of Korea); LAS (Lithuania); MOE and UM (Malaysia); CINVESTAV,
CONACYT, SEP, and UASLP-FAI (Mexico); MBIE (New Zealand); PAEC
(Pakistan); MSHE and NSC (Poland); FCT (Portugal); JINR (Dubna);
MON, RosAtom, RAS and RFBR (Russia); MESTD (Serbia); SEIDI and
CPAN (Spain); Swiss Funding Agencies (Switzerland); MST (Taipei);
ThEPCenter, IPST, STAR and NSTDA (Thailand); TUBITAK and TAEK
(Turkey); NASU and SFFR (Ukraine); STFC (United Kingdom); DOE
and NSF (USA).
Individuals have received support from the Marie-Curie programme
and the European Research Council and EPLANET (European
Union); the Leventis Foundation; the A.P. Sloan Foundation;
the Alexander von Humboldt Foundation; the Belgian Federal
Science Policy Office; the Fonds pour la Formation à la
Recherche dans l’Industrie et dans l’Agriculture (FRIA-Belgium); the
Agentschap voor Innovatie door Wetenschap en Technologie (IWTBelgium);
the Ministry of Education, Youth and Sports (MEYS) of
the Czech Republic; the Council of Science and Industrial Research,
India; the HOMING PLUS programme of Foundation for Polish
Science, cofinanced from European Union, Regional Development
Fund; the Compagnia di San Paolo (Torino); the Consorzio per la
Fisica (Trieste); MIUR project 20108T4XTM (Italy); the Thalis and
Aristeia programmes cofinanced by EU-ESF and the Greek NSRF;
and the National Priorities Research Program by Qatar National Research
Fund; and the Russian Scientific Fund, grant N 14-12-0011
Measurement of the Z boson differential cross section in transverse momentum and rapidity in proton-proton collisions at 8 TeV
We present a measurement of the Z boson differential cross section in rapidity and transverse momentum using a data sample of pp collision events at a centre-of-mass energy √s=8 TeV, corresponding to an integrated luminosity of 19.7 fb-1. The Z boson is identified via its decay to a pair of muons. The measurement provides a precision test of quantum chromodynamics over a large region of phase space. In addition, due to the small experimental uncertainties in the measurement the data has the potential to constrain the gluon parton distribution function in the kinematic regime important for Higgs boson production via gluon fusion. The results agree with the next-to-next-to-leading-order predictions computed with the fewz program. The results are also compared to the commonly used leading-order MadGraph and next-to-leading-order powheg generatorsWe acknowledge the enduring support for the construction and operation of the LHC and the CMS detector provided by the following funding agencies: BMWFW and FWF (Austria); FNRS and FWO (Belgium); CNPq, CAPES, FAPERJ, and FAPESP (Brazil); MES (Bulgaria); CERN; CAS, MOST, and NSFC (China); COLCIENCIAS (Colombia); MSES and CSF (Croatia); RPF (Cyprus); MoER, ERC IUT and ERDF (Estonia); Academy of Finland, MEC, and HIP (Finland); CEA and CNRS/IN2P3 (France); BMBF, DFG, and HGF (Germany); GSRT (Greece); OTKA and NIH (Hungary); DAE and DST (India); IPM (Iran); SFI (Ireland); INFN (Italy); MSIP and NRF (Republic of Korea); LAS (Lithuania); MOE and UM (Malaysia); CINVESTAV, CONACYT, SEP, and UASLP-FAI (Mexico); MBIE (New Zealand); PAEC (Pakistan); MSHE and NSC (Poland); FCT (Portugal); JINR (Dubna); MON, RosAtom, RAS and RFBR (Russia); MESTD (Serbia); SEIDI and CPAN (Spain); Swiss Funding Agencies (Switzerland); MST (Taipei); ThEPCenter, IPST, STAR and NSTDA (Thailand); TUBITAK and TAEK (Turkey); NASU and SFFR (Ukraine); STFC (United Kingdom); DOE and NSF (USA). Individuals have received support from the Marie-Curie program and the European Research Council and EPLANET (European Union); the Leventis Foundation; the A.P. Sloan Foundation; the Alexander von Humboldt Foundation; the Belgian Federal Science Policy Office; the Fonds pour la Formation à la Recherche dans l’Industrie et dans l’Agriculture (FRIA-Belgium); the Agentschap voor Innovatie door Wetenschap en Technologie (IWT-Belgium); the Ministry of Education, Youth and Sports (MEYS) of the Czech Republic; the Council of Science and Industrial Research, India; the HOMING PLUS program of the Foundation for Polish Science, cofinanced from European Union, Regional Development Fund; the Compagnia di San Paolo (Torino); the Consorzio per la Fisica (Trieste); MIUR project 20108T4XTM (Italy); the Thalis and Aristeia programs cofinanced by EU-ESF and the Greek NSRF; and the National Priorities Research Program by Qatar National Research Fun
The SFXC software correlator for Very Long Baseline Interferometry: Algorithms and Implementation
In this paper a description is given of the SFXC software correlator,
developed and maintained at the Joint Institute for VLBI in Europe (JIVE). The
software is designed to run on generic Linux-based computing clusters. The
correlation algorithm is explained in detail, as are some of the novel modes
that software correlation has enabled, such as wide-field VLBI imaging through
the use of multiple phase centres and pulsar gating and binning. This is
followed by an overview of the software architecture. Finally, the performance
of the correlator as a function of number of CPU cores, telescopes and spectral
channels is shown.Comment: Accepted by Experimental Astronom
Sensitive Species Data in Colorado’s State and Local Government Decision-Making
This report addresses the use of sensitive species data in Colorado at both the state and local levels. At the state level, this research focuses on environmental statutes and regulations, permitting authority in various state agencies, and processes for identifying and dealing with sensitive species. At the local level, the focus is on the role of sensitive species data in development proposals, as well as the varying level of detail required for considering sensitive species data in in local government decision-making.
Principally, this report identifies: (1) areas where statutes and regulations require the consideration of sensitive species data; (2) areas where data could be used but are not used currently; and (3) impediments to the best data being used in decision-making. Finally, this report offers suggested best practices and recommendations for statutory and regulatory changes to ensure that decision-makers are using the best available sensitive species data.
The recommendations provided in this report include statutory changes, regulatory amendments, and changes to policy documents. Ultimately, each of these recommendations serve to increase transparency in decision-making processes and improve considerations of environmental impacts. While this report recognizes that the overarching goal of more complete considerations for sensitive species may be achieved through recommendations not included in this report, the recommendations provided intend to serve as a framework to guide potential changes to the law
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