T

Gressner, A. M.; Arndt, T.

doi:10.1007/978-3-642-12921-6_20

Cited by 2 publications

(2 citation statements)

References 90 publications

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“…All selected fluids had an ionic strength of ~ 0.16 M, 11 , 13 , 22 as assumed for blood plasma, but differed in their Ca T concentrations, and fluid C additionally in the P T concentration. For the same ionic strength, this resulted in different activities of free calcium and HPO 4 2- , which allowed the different ion products and saturation levels to be adjusted, especially with regard to the solubility product of DCPD.…”

Section: Methodsmentioning

confidence: 99%

In Vitro Calcification of Bioprosthetic Heart Valves: Test Fluid Validation on Prosthetic Material Samples

et al. 2020

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Calcification is a major failure mode of bioprosthetic heart valves. So far, cost and time saving in vitro analyses of calcification potentials are unreliable, mostly due to superficial or spontaneous precipitation of the applied fluids. In this study, we developed a near-physiological non-spontaneously precipitating fluid for an accelerated in vitro calcification assessment, and validated it by analyzing the calcification potential of two prosthetic materials within two reference-tests. The first test focused on the comparison of four calcification fluids under dynamic contact with n=12 commercial bovine pericardium patches. The second one focused on the validation of the most appropriate fluid by analyzing the calcification potential of pericardium vs. polyurethane. The patches were mounted in separate test compartments and treated simultaneously with the respective fluids at an accelerated test frequency. Calcification propensity and progression were detected macroscopically and microscopically. Structural analyses of all deposits indicated hydroxyapatite by X-ray powder diffraction, which is also most commonly observed in vivo. Histological examination by von Kossa staining showed matrix internal and superficial calcifications, depending on the fluid composition. The present study reveals promising results towards the development of a meaningful, cost and time saving in vitro analysis of the calcification potential of bioprosthetic heart valves.

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Section: Methodsmentioning

confidence: 99%

In Vitro Calcification of Bioprosthetic Heart Valves: Test Fluid Validation on Prosthetic Material Samples

et al. 2020

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“…In 1979, Steadman proposed the HI as the AT, an index that is widely used in areas with hot conditions. Subsequently, we converted the calculated HI ( • F) to • C [47]. The calculation formula is as follows [9]: HI = 0.3564 × T + 0.0274104 × RH + 14.58824.…”

Section: Himentioning

confidence: 99%

Daily Spatial Distribution of Apparent Temperature Comfort Zone in China Based on Heat Index

2022

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Apparent temperature (AT) is used to evaluate human comfort and is of great importance for studies on the effects of environmental factors on human health. This study used the daytime heat index (HI) calculated by national surface meteorological stations in China as the AT dependent variable, with August 2020 employed as an example. The daytime fifth generation European Centre for Medium-Range Weather Forecasts (ECMWF) atmospheric reanalysis of the global climate (ERA5) data and multi-source data extracted from the stations were used as the independent variables. Due to the presence of multicollinearity among the independent variables, we implemented a multiple stepwise regression model and developed a daily near-surface 1 km HI estimation model. The correlation analysis using the model showed that the coefficient of determination (R2) was 0.89; the mean absolute error (MAE) was 1.49 °C, and the root mean square error (RMSE) was 2.08 °C. We also used 10-fold cross-validation to calculate the error between the parameter and predicted values. The R2 of the model was 0.96; the MAE was 1.80 °C, and the RMSE was 2.40 °C. In this month, the mean daily daytime HI ranged from −7.32 °C to 34.12 °C. According to the Universal Thermal Climate Index (UTCI), the areas with more than 20 days of heat stress for one month were largely distributed in the desert areas of northwest China and the coastal areas in southeast China, accounting for 29.98% of the total land area of China. This study improves the spatial resolution and accuracy of HI prediction, thus providing a scientific reference for studying urban residential environments and the urban heat island effect.

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T

Cited by 2 publications

References 90 publications

In Vitro Calcification of Bioprosthetic Heart Valves: Test Fluid Validation on Prosthetic Material Samples

In Vitro Calcification of Bioprosthetic Heart Valves: Test Fluid Validation on Prosthetic Material Samples

Daily Spatial Distribution of Apparent Temperature Comfort Zone in China Based on Heat Index

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