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Search Results: 1 - 10 of 462981 matches for " Pe?a Atrio "
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Bupivacaína como anestésico local en las artroscopias de rodilla
Pea Atrio,Gabriel A.; Aguilar Román,Francisco; Torres García,Jackeline; Pereda Cardoso,Osvaldo;
Revista Cubana de Ortopedia y Traumatolog?-a , 1999,
Abstract: a clinical experience connected with the use of bupivacaine as a local anesthetic to perform knee arthroscopies in a group of 62 adult patients was approached. the surgical procedure was described. some results were given and recommendations were made. complications were also analyzed.
Mordeduras de serpientes
Pereda Cardoso,Osvaldo; Pea Atrio,Gabriel A.; Ayala Chinea,Angel P.;
Revista Cubana de Ortopedia y Traumatolog?-a , 2007,
Abstract: there are no venomous snakes in cuba, so the physicians are not familiar with the treatment of snake bites. in spite of the fact that this is not a national health problem, it deems necessary to address this topic, taking into account the solidarity character of our medicine that has extended its assistance to the whole planet. a detailed literature review was made on this topic based on variables such as geographical distribution of venomous snakes, dangerous species, number, way of identification, snake behaviour, human behaviour to face the reptile, clinical picture of the bite, complications and prophylactic and curing treatment. conclusions are provided in relation to the importance of this study.
Measuring cosmological bulk flows via the kinematic Sunyaev-Zeldovich effect in the upcoming cosmic microwave background maps
A. Kashlinsky,F. Atrio-Barandela
Physics , 2000, DOI: 10.1086/312735
Abstract: We propose a new method to measure the possible large-scale bulk flows in the Universe from the cosmic microwave background (CMB) maps from the upcoming missions, MAP and Planck. This can be done by studying the statistical properties of the CMB temperature field at many X-ray cluster positions. At each cluster position, the CMB temperature fluctuation will be a combination of the Sunyaev-Zeldovich (SZ) kinematic and thermal components, the cosmological fluctuations and the instrument noise term. When averaged over many such clusters the last three will integrate down, whereas the first one will be dominated by a possible bulk flow component. In particular, we propose to use all-sky X-ray cluster catalogs that should (or could) be available soon from X-ray satellites, and then to evaluate the dipole component of the CMB field at the cluster positions. We show that for the MAP and Planck mission parameters the dominant contributions to the dipole will be from the terms due to the SZ kinematic effect produced by the bulk flow (the signal we seek) and the instrument noise (the noise in our signal). Computing then the expected signal-to-noise ratio for such measurement, we get that at the 95 % confidence level the bulk flows on scales >100h^{-1} Mpc can be probed down to the amplitude of $< 200$ km/sec with the MAP data and down to only 30 km/sec with the Planck mission.
Association of Socioeconomic Factors to Domestic Violence and Murder of Women: The Case of Yucatán, México  [PDF]
Yolanda Oliva Pea
Psychology (PSYCH) , 2016, DOI: 10.4236/psych.2016.714175
Abstract: Registration of deaths classified as femicide, is an issue that occupies a breach of law, and that in this matter inconsistencies and absences in the information generated persist and persist in popular culture a strong stigma that various social groups and affected (victims) lead to underreporting of gender violence. Documentary research that conducted to determine the association of geographic areas and social factors related to violence to women occurred in the state of Yucatan during 2004 to 2014. Of the major findings of this study are: there are significant differences in the presence of domestic violence with the economic sector with a value of the test statistic of 13,500 with two degrees of freedom, a significant difference with a P-value of 0.001 (P-value < 0.05) was obtained, and P-value 0.000 (P-value < 0.05) for the murders of women. Geospatial distribution shows that the municipalities highest number of cases reported are found in large cities, and related to the three sectors of economic activity. Geographical distribution is North, South and East of the state. We conclude that it is required to have a surveillance system for the prevention of gender violence, also provide therapy to both men and women who have lived or have used violence systematically and taught by trained and sensitive to provide such care staff, and thus prevent deaths from gender violence.
Using peak distribution of the cosmic microwave background for MAP and Planck data analysis: formalism and simulations
C. Hernandez-Monteagudo,A. Kashlinsky,F. Atrio-Barandela
Physics , 2002, DOI: 10.1051/0004-6361:20031583
Abstract: We implement and further refine the recently proposed method (Kashlinsky, Hern\'andez-Monteagudo & Atrio-Barandela, 2001 - KHA) for a time efficient extraction of the power spectrum from future cosmic microwave background (CMB) maps. The method is based on the clustering properties of peaks and troughs of the Gaussian CMB sky. The procedure takes only ${1/2}[f(\nu)]^2N^2$ steps where $f(\nu)$ is the fraction of pixels with $|\delta T|\geq\nu$ standard deviations in the map of $N$ pixels. We use the new statistic introduced in KHA, $\xi_\nu$, which characterizes spatial clustering of the CMB sky peaks of progressively increasing thresholds. The tiny fraction of the remaining pixels (peaks and troughs) contains the required information on the CMB power spectrum of the entire map. The threshold $\nu$ is the only parameter that determines the accuracy of the final spectrum. We performed detailed numerical simulations for parameters of the two-year WMAP and Planck CMB sky data including cosmological signal, inhomogeneous noise and foreground residuals. In all cases we find that the method can recover the power spectrum out to the Nyquist scale of the experiment channel. We discuss how the error bars scale with $\nu$ allowing to decide between accuracy and speed. The method can determine with significant accuracy the CMB power spectrum from the upcoming CMB maps in only $\sim(10^{-5}-10^{-3})\times N^2$ operations.
Measuring bulk motion of X-ray clusters via the kinematic Sunyaev-Zeldovich effect: summarizing the "dark flow" evidence and its implications
A. Kashlinsky,F. Atrio-Barandela,H. Ebeling
Physics , 2012,
Abstract: In this review we present a comprehensive discussion of peculiar velocity field measured recently on very large scales with a novel method using X-ray galaxy clusters as tracers. The measurement is based on the kinematic component of the Sunyaev-Zeldovich (KSZ) effect produced by Compton scattering of cosmic microwave background (CMB) photons off the hot intracluster gas, and uses a large catalog of X-ray selected clusters and all-sky CMB maps obtained with the WMAP satellite. The method probes the dipole of the CMB temperature field evaluated at the cluster positions and within the apertures in which the CMB monopole contribution vanishes, thereby isolating the signal remaining from the KSZ effect produced by coherently moving clusters. The detection of a highly significant dipole out to the depth of at least ~ 800 Mpc casts doubt on the notion that gravitational instability from the observed mass distribution is the sole -- or even dominant -- cause of the detected motions. Rather it appears that the flow may extend across the entire observable Universe. Possible implications include the possibility to constrain the primeval preinflationary structure of space-time and its landscape, and/or the need for modifications of presently known physics (e.g. arising from a higher-dimensional structure of gravity). We review these possibilities in light of the measurements described here and specifically discuss the prospects of future measurements and the issues they should resolve. We address the consistency of these large-scale velocity measurements with those obtained on smaller scales by studies using galaxies as tracers, and resolve the discrepancies with two recent claims based on modified CMB analysis schemes.
Measuring the dark flow with public X-ray cluster data
A. Kashlinsky,F. Atrio-Barandela,H. Ebeling
Physics , 2010, DOI: 10.1088/0004-637X/732/1/1
Abstract: We present new results on the "dark flow" from a measurement of the dipole in the distribution of peculiar velocities of galaxy clusters, applying the methodology proposed and developed by us earlier. Our latest measurement is conducted using new, low-noise 7-yr WMAP data as well as an all-sky sample of X-ray selected galaxy clusters compiled exclusively from published catalogs. Our analysis of the CMB signature of the kinematic Sunyaev-Zeldovich (SZ) effect finds a statistically significant dipole at the location of galaxy clusters. The residual dipole outside the cluster regions is small, rendering our overall measurement 3-4 sigma significant. The amplitude of the dipole correlates with cluster properties, being larger for the most X-ray luminous clusters, as required if the signal is produced by the SZ effect. Since it is measured at zero monopole, the dipole can not be due to the thermal SZ effect. Our results are consistent with those obtained earlier by us from 5-yr WMAP data and using a proprietary cluster catalog. In addition, they are robust to quadrupole removal, demonstrating that quadrupole leakage contributes negligibly to the signal. The lower noise of the 7-yr WMAP also allows us, for the first time, to obtain tentative empirical confirmation of our earlier conjecture that the adopted filtering flips the sign of the KSZ effect for realistic clusters and thus of the deduced direction of the flow. The latter is consistent with our earlier measurement in both the amplitude and direction. Assuming the filtering indeed flips the sign of the KSZ effect from the clusters, the direction agrees well also with the results of independent work using galaxies as tracers at lower distances. We make all maps and cluster templates derived by us from public data available to the scientific community to allow independent tests of our method and findings.
Cosmic Microwave Background filters and the Dark-Flow measurement
F. Atrio-Barandela,A. Kashlinsky,H. Ebeling,D. Kocevski
Physics , 2012,
Abstract: Recent measurements of large-scale peculiar velocities from the cumulative kinematic Sunyaev-Zel'dovich effect using WMAP data and X-ray selected clusters from ROSAT have identified a bulk flow of galaxy clusters at $\sim 600-1,000$ km s$^{-1}$ on scales of $\sim0.5-1$ Gpc, roughly aligned with the all-sky Cosmic Microwave Background (CMB) dipole. The flow is inferred from the detection of a residual dipole generated by CMB fluctuations exclusively in the direction of galaxy clusters, and measured within apertures containing zero monopole. Consistent with this interpretation, the amplitude of the dipole correlates with the X-ray luminosity of the clusters. To enable this measurement, the CMB data need to be filtered to remove the primary CMB, thereby increasing the data's signal-to-noise ratio. Filtering cannot imprint a signal with the mentioned properties at cluster positions; however, an inadequately designed filter can greatly suppress such a signal. We show here that recent studies that failed to detect a large-scale flow with various filters indeed adopted flawed implementations; when correctly implemented, these alternative filters lead to results that are in fact consistent with the Dark Flow signal. The discrepancies can be traced to the likely presence of residual dipoles caused by the thermal Sunyaev-Zel'dovich effect, to assumptions about cluster profiles incompatible with the data as well as failure to compute dipoles at the zero monopole aperture. PLANCK maps, with their large frequency coverage and a 217 GHz channel, will be instrumental to probe bulk flows, to remove spurious dipole signals and to help identify filtering schemes appropriate for this measurement.
Microbiota and Mycotoxins in Trilinear Hybrid Maize Produced in Natural Environments at Central Region in Mexico  [PDF]
Pea Betancourt, Silvia Denise
Advances in Microbiology (AiM) , 2016, DOI: 10.4236/aim.2016.69066
Abstract: Mycotoxigenic fungi and mycotoxins in 3 inbred lines (hybrids resistant to corn ear rot) were identified in twenty samples. The maize (Zea mays) accessions were collected in five plots of two municipalities in High Valley, state of Hidalgo. The fungal population was determined with a microbiological dilution method used two culture media (PDA and ELA), for the detection of mycotoxins with thin layer chromatography with visual inspection in UV light and a direct competitive enzyme-linked immunosorbent (ELISA). The results showed high moisture content in all hybrids evaluated on an average of 38.3% and a 1.8 × 103 UFC/g fungus, values within the permitted limits by the Mexican legislation; however the most prevalent fungi were Fusarium sp. (76%), Alternaria sp. (14%), Penicillium sp. (4%) and Aspergillus sp. (5%), and the species Aspergillus nidulas, Aspergillus flavus, Fusarium verticillioides, Fusarium poae, and Penicillium ochraceum. The aflatoxin concentration was observed in a range from 2 to 13 ng/g and 370 to 660 ng/g to fumonisins. It is concluded that trilinear corn hybrids have a variety of pathogenic potential fungi. The two genetic hybrids showed levels of aflatoxins and fumonisin safe for human consumption, contrary to one hybrid, with a content not suitable for human consumption. A better understanding of genetic hybrids corn will improve predictive mycotoxin contamination.
Shifted Appell sequences in Clifford analysis
Dixan Pea Pea
Mathematics , 2011,
Abstract: This paper is a continuation of [D. Pe\~{n}a Pe\~{n}a, On a sequence of monogenic polynomials satisfying the Appell condition whose first term is a non-constant function, arXiv:1102.1833], in which we prove that for every monogenic polynomial $\mathbf{P}_k(x)$ of degree $k$ in $\mathbb R^{m+1}$ there exists a sequence of monogenic polynomials $\{M_n(x)\}_{n\ge0}$ satisfying the Appell condition such that $M_0(x)=\mathbf{P}_k(x)$.
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