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Search Results: 1 - 10 of 138883 matches for " K. Semeniuk "
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Analysis of Participant Reactivity in Dyads Performing a Videotaped Conflict-Management Task
Yulia Y. Semeniuk,Susan K. Riesch
ISRN Nursing , 2011, DOI: 10.5402/2011/596820
Abstract: Videotaping is used frequently in nursing research. A threat to the validity of videotaping is participant reactivity, that is, being recorded by a camera may influence the behavior of interest. This paper's purpose is to report how youth ages 10 to 14?years old and their parent viewed participation in a videotaped conflict-management task. Five dyads, who were part of a randomized clinical trial testing an intervention to promote parent-child communication, participated in a structured interview. All parents were mothers. Youth were eighth graders. Three were boys and two were girls. Findings indicated that (a) dyads felt that the videotaped interaction had a progression of feeling unnatural in the beginning to feeling natural toward the end, (b) dyads found it relatively easy to choose a topic of discussion, and (c) dyads felt that the discussions were meaningful. Based on these data, recommendations for researchers to reduce participant reactivity are provided. 1. Introduction As children develop into adolescents, conflict with parents increases. The ability to negotiate and resolve conflict is an important element of family functioning and parent-child communication [1]. Unmanaged conflicts potentially have negative effects on the parent and child relationship [2] and youth health and development [3]. Therefore, it is important for researchers to examine and practitioners to apply strategies to assist parents and youth to acquire skills to manage conflicts. Universal prevention and intervention programs that target adults and youth at the transition to adolescence have been developed and disseminated. The Strengthening Families Program (SFP) 10–14 is one example. Guided by the Biopsychosocial Vulnerability Model [4] and empirically based family risk and protective factors [5], SFP 10–14 is a Substance Abuse and Mental Health Services Administration (SAMHSA) model program. A model program is one that has undergone scientific review by the National Registry of Evidence-based Programs and Practices (NREPP) (http://www.nrepp.samhsa.gov/ accessed 5 July 2010). The NREPP evaluation of the program includes an analysis of the reliability, validity, intervention fidelity, missing data and attrition, potential confounding variables, and appropriateness of analysis. NREPP criteria also address the program readiness for dissemination including an evaluation of the implementation materials, quality of the training and support resources, and quality assurance procedures. The SFP 10–14 focuses on general family strengthening techniques, such as discipline, family
Transport of aerosol pollution in the UTLS during Asian summer monsoon as simulated by ECHAM5-HAMMOZ model
S. Fadnavis,K. Semeniuk,L. Pozzoli,M. G. Schultz
Atmospheric Chemistry and Physics Discussions , 2012, DOI: 10.5194/acpd-12-30081-2012
Abstract: An eight member ensemble of ECHAM5-HAMMOZ simulations for the year 2003 is analyzed to study the transport of aerosols in the Upper Troposphere and Lower Stratosphere (UTLS) during the Asian Summer Monsoon (ASM). Simulations show persistent maxima in black carbon, organic carbon, sulfate, and mineral dust aerosols within the anticyclone in the UTLS throughout the ASM (period from July to September) when convective activity over the Indian subcontinent is highest. Model simulations indicate boundary layer aerosol pollution as the source of this UTLS aerosol layer and identify ASM convection as the dominant transport process. Evidence of ASM transport of aerosols into the stratosphere is observed in HALogen Occultation Experiment (HALOE) and Stratospheric Aerosol and Gas Experiment (SAGE) II aerosol extinction. The impact of aerosols in the UTLS region is analyzed by evaluating the differences between simulations with (CTRL) and without aerosol (HAM-off) loading. The transport of anthropogenic aerosols in the UTLS increases cloud ice, water vapour and temperature, indicating that aerosols play an important role in enhancement of cloud ice in the Upper-Troposphere (UT). Aerosol induced circulation changes include a weakening of the main branch of the Hadley circulation and increased vertical transport around the southern flank of the Himalayas and reduction in monsoon precipitation over the India region.
Corrigendum to "The Australian bushfires of February 2009: MIPAS observations and GEM-AQ model results" published in Atmos. Chem. Phys., 13, 1637–1658, 2013
N. Glatthor,M. H?pfner,K. Semeniuk,A. Lupu
Atmospheric Chemistry and Physics (ACP) & Discussions (ACPD) , 2013, DOI: 10.5194/acp-13-4373-2013
Abstract: No abstract available.
The Australian bushfires of February 2009: MIPAS observations and GEM-AQ model results
N. Glatthor,M. H?pfner,K. Semeniuk,A. Lupu
Atmospheric Chemistry and Physics (ACP) & Discussions (ACPD) , 2013, DOI: 10.5194/acp-13-1637-2013
Abstract: Starting on 7 February 2009, southeast Australia was devastated by large bushfires, which burned an area of about 3000 km2 on this day alone. This event was extraordinary, because a large number of combustion products were transported into the uppermost troposphere and lower stratosphere within a few days. Various biomass burning products released by the fire were observed by the Michelson Interferometer for Passive Atmospheric Sounding (MIPAS) on the Envisat satellite. We tracked the plume using MIPAS C2H2, HCN and HCOOH single-scan measurements on a day-to-day basis. The measurements were compared with a high-resolution model run of the Global Environmental Multiscale Air Quality (GEM-AQ) model. Generally there is good agreement between the spatial distribution of measured and modelled pollutants. Both MIPAS and GEM-AQ show a fast southeastward transport of the pollutants to New Zealand within one day. During the following 3–4 days, the plume remained northeastward of New Zealand and was located at altitudes of 15 to 18 km. Thereafter its lower part was transported eastward, followed by westward transport of its upper part. On 17 February the eastern part had reached southern South America and on 20 February the central South Atlantic. On the latter day a second relic of the plume was observed moving eastward above the South Pacific. Between 20 February and the first week of March, the upper part of the plume was transported westward over Australia and the Indian Ocean towards southern Africa. First evidence for entry of the pollutants into the stratosphere was found in MIPAS data of 11 February, followed by larger amounts on 17 February and the days thereafter. From MIPAS data, C2H2/HCN and HCOOH/HCN enhancement ratios of 0.76 and 2.16 were calculated for the first days after the outbreak of the fires, which are considerably higher than the emission ratios assumed for the model run and at the upper end of values found in literature. From the temporal decrease of the enhancement ratios, mean lifetimes of 16–20 days and of 8–9 days were calculated for measured C2H2 and HCOOH. The respective lifetimes calculated from the model data are 18 and 12 days.
Células madre: Vida más allá de la muerte
Guillermo Semeniuk
Medicina (Buenos Aires) , 2012,
A favor de una buena legislación sobre terapias con células madre
Guillermo Semeniuk
Medicina (Buenos Aires) , 2013,
Detached Eclipsing Binaries for Parallax Measurement
Irena Semeniuk
Physics , 2001,
Abstract: A list of 50 bright Detached Eclipsing Binaries proposed for precise parallax measurements for the FAME is presented. The eclipsing binaries, with precise distances and with photometric and double-line spectroscopic orbits determined, are essential for a full calibration of relations that could be used for very precise distance determination of globular clusters, LMC, SMC, and perhaps also M31 and M33.
Comparison of Parallaxes from Eclipsing Binaries Method with Hipparcos Parallaxes
Irena Semeniuk
Physics , 2000,
Abstract: The parallaxes determined by Lacy (1979) by means of eclipsing binaries method are compared with the Hipparcos parallaxes for 19 systems. The residual scatter of the distance moduli inferred from eclipsing binaries method - after allowing for known errors as given by Lacy and Hipparcos - is equal to 0.18 mag. It decreases to 0.08 mag when obviously not fitting semi-detached systems and systems with chromospheric activity of components are removed from the sample.
Comparison of CMAM simulations of carbon monoxide (CO), nitrous oxide (N2O), and methane (CH4) with observations from Odin/SMR, ACE-FTS, and Aura/MLS
J. J. Jin,K. Semeniuk,S. R. Beagley,V. I. Fomichev
Atmospheric Chemistry and Physics Discussions , 2008,
Abstract: Simulations of CO, N2O and CH4 from a coupled chemistry-climate model (CMAM) are compared with satellite measurements from Odin Sub-Millimeter Radiometer (Odin/SMR), Atmospheric Chemistry Experiment Fourier Transform Spectrometer (ACE-FTS), and Aura Microwave Limb Sounder (Aura/MLS). Pressure-latitude cross-sections and seasonal time series demonstrate that CMAM reproduces the observed global distributions and the polar winter time evolutions of the CO, N2O, and CH4 measurements quite well. Generally, excellent agreement with measurements is found in CO monthly zonal mean profiles in the stratosphere and mesosphere for various latitudes and seasons. The difference between the simulations and the observations are generally within 30%, which is comparable with the difference between the instruments in the upper stratosphere and mesosphere. In general, the CO measurements also show an excellent agreement between themselves although MLS retrievals are noisier than other retrievals above 10 hPa (~32 km). The measurements also show large difference in the lower stratosphere and upper troposphere. Comparisons of N2O show that CMAM results usually have a less than 15% difference to the measurements in the lower and middle stratosphere, and the observations are consistent as well. However, the standard version of CMAM has a serious low bias in the upper stratosphere. The CMAM CH4 distribution is also close to the observations in the lower stratosphere, but has a similar but smaller negative bias in the upper stratosphere. These negative biases can be reduced by introducing a vertical diffusion coefficient related to gravity wave drag. CO measurements from 2004 and 2006 show evidence of enhanced descent of air from the mesosphere into the stratosphere in the Arctic after strong stratospheric sudden warmings (SSWs). CMAM also shows strong descent of air after SSWs, but further investigation is needed. In the tropics, CMAM captures the "tape recorder" (or annual oscillation) in the lower stratosphere and the semiannual oscillations (SAO) at the stratopause and mesopause shown in MLS CO and SMR N2O observations. The inter-annual variation of the SAO at the stratopause in SMR N2O observations also shows a biennial oscillation, but CMAM cannot does not reproduce this feature. However, this study confirms that CMAM is able to simulate middle atmospheric transport processes reasonably well.
De la mitología a la medicina
Guillermo B. Semeniuk
Panace@ : Revista de Medicina, Lenguaje y Traducción , 2009,
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