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Coefficient Correlation (coefficient + correlation)

Distribution by Scientific Domains

Medical Sciences	40%

Selected Abstracts

Relationships between nurse care-giving behaviours and preterm infant responses during bathing: a preliminary study

JOURNAL OF CLINICAL NURSING, Issue 1-2 2010
Jen-Jiuan Liaw
Aims., The purpose of this study was to explore the relationships between specific nurse care-giving behaviours and preterm infant behavioural responses during bathing and to identify nurse behaviours associated with infant ,stress'. Background., Although recent advances in medical technology have improved neonatal intensive care, the high mortality and morbidity rates in preterm infants have not decreased proportionally. As caregivers strive to reduce infant mortality and morbidity, a factor for consideration is which caregiver behaviours are associated with preterm infant well-being. Design., A descriptive correlational design. Method., Convenience samples of 24 preterm infants and 12 nurses were recruited. A total of 120 baths were videotaped. Infant and nurse behaviours were measured using the coding schemes developed by the researchers. Pearson coefficient correlation, non-parametric Kruskal,Wallis test, t -test and generalised linear models were methods for data analysis. Results., As nurses provided more support, stress was reduced in the infants, and their self-regulation during the bath was enhanced especially by the use of ,containment' and ,positional support'. Conversely, non-therapeutic caregiver behaviours including ,rapid and rough handling' of the baby, ,chatting with other people' and ,inappropriate handling' increased infant ,stress' during the bath. Conclusion., The findings provide new information about the link between care-giving and infant responses and how caregivers can better interact with preterm infants during a very sensitive period of brain development. Relevance to clinical practice., How nurses take care of the preterm infants influences their responses to care-giving stimuli. To interact better with the infant during care-giving procedures, nurses need to provide more supportive care-giving behaviours especially ,position support' and ,containment' based on the infant's needs, and avoid care-giving that may be too rough and occur too quickly without attending the baby's stressful signals, positioning the baby in hyperextension posture, or chatting with other people during procedures. [source]

Numerical Simulation of Absorbing CO2 with Ionic Liquids

CHEMICAL ENGINEERING & TECHNOLOGY (CET), Issue 10 2010
X. Wang
Abstract Although separating CO2 from flue gas with ionic liquids has been regarded as a new and effective method, the mass transfer properties of CO2 absorption in these solvents have not been researched. In this paper, a coupled computational fluid dynamic (CFD) model and population balance model (PBM) was applied to study the mass transfer properties for capturing CO2 with ionic liquids solvents. The numerical simulation was performed using the Fluent code. Considering the unique properties of ionic liquids, the Eulerian-Eulerian two-flow model with a new drag coefficient correlation was employed for the gas-liquid fluid dynamic simulation. The gas holdup, interfacial area, and bubble size distribution in the bubble column reactor were predicted. The mass transfer coefficients were estimated with Higbie's penetration model. Furthermore, the velocity field and pressure field in the reactor were also predicted in this paper. [source]

Water fluoridation as a marker for sociodental inequalities

COMMUNITY DENTISTRY AND ORAL EPIDEMIOLOGY, Issue 2 2008
Marilisa Carneiro Leão Gabardo
Abstract,,, Objectives:, The aim of this study was to investigate the associations between the Human Development Index at city level (HDI-M) in the state of Paraná, Brazil, and the length of time of population exposure to water fluoridation (time span) with the respective mean decayed, missing and filled teeth (DMF-T) of schoolchildren in the state, looking at possible inequalities in these associations. Methods:, The HDI,M of 323 cities in the state of Paraná, Brazil, was correlated to the duration of exposure to water fluoridation, calculated in number of days. Correlation between the HDI-M and the DMF-T indexes for 12-year-old children was also performed. Results:, Correlations were statistically significant, showing that in the cities with a better HDI-M, water fluoridation had been implemented earlier (squared coefficient correlation of 22%). The fluoridation time span accounted for around 11% of the variance in the DMF-T indexes of the cities. The correlation indicated that locations with a better HDI-M had a better DMF-T, owing to the probable mediating effect of receiving fluoridation earlier. Furthermore, the cost of water fluoridation to benefit the population that has access to this public health measure has been estimated at USD 0.15 per capita/year. Conclusions:, It is possible to conclude that this low-cost measure is able to improve oral health status in general. Nevertheless, in the Brazilian areas studied, fluoridation seems to reflect existing social development inequalities, as it was first made available in more socially developed areas, thus bearing an influence on their higher DMF-T performance to date. [source]

The design of an optimal filter for monthly GRACE gravity models

GEOPHYSICAL JOURNAL INTERNATIONAL, Issue 2 2008
R. Klees
SUMMARY Most applications of the publicly released Gravity Recovery and Climate Experiment monthly gravity field models require the application of a spatial filter to help suppressing noise and other systematic errors present in the data. The most common approach makes use of a simple Gaussian averaging process, which is often combined with a ,destriping' technique in which coefficient correlations within a given degree are removed. As brute force methods, neither of these techniques takes into consideration the statistical information from the gravity solution itself and, while they perform well overall, they can often end up removing more signal than necessary. Other optimal filters have been proposed in the literature; however, none have attempted to make full use of all information available from the monthly solutions. By examining the underlying principles of filter design, a filter has been developed that incorporates the noise and full signal variance,covariance matrix to tailor the filter to the error characteristics of a particular monthly solution. The filter is both anisotropic and non-symmetric, meaning it can accommodate noise of an arbitrary shape, such as the characteristic stripes. The filter minimizes the mean-square error and, in this sense, can be considered as the most optimal filter possible. Through both simulated and real data scenarios, this improved filter will be shown to preserve the highest amount of gravity signal when compared to other standard techniques, while simultaneously minimizing leakage effects and producing smooth solutions in areas of low signal. [source]

Sensitivity Study on Modeling an Internal Airlift Loop Reactor Using a Steady 2D Two-Fluid Model

CHEMICAL ENGINEERING & TECHNOLOGY (CET), Issue 12 2008
Q. Huang
Abstract The sensitivity study of bubbly flow in an internal airlift loop reactor is presented using a steady Reynolds averaging two-fluid model. Comparative evaluation of different drag formulations, drag coefficient correlations, turbulence effect on the drag coefficient, outlet slip velocity, and bubble size is performed and the respective influence to the simulation results is highlighted. It is found that a complicated drag formulation may not result in reliable predictions. All the drag coefficient correlations underpredict the gas holdup if the influence of turbulence on the drag coefficient is not well incorporated. Fortunately, the global hydrodynamics is not sensitive to the outflow slip velocity for a wide range, so a steady two-fluid model can be used to simulate the bubbly flow when the flow field is fully developed. The correct estimation of bubble size with properly selected correlations play an important role in successful simulation of gas-liquid bubbly flow in airlift loop reactors. [source]