Equilibrium of drops on inclined hydrophilic surfaces

Why does not gravity make drops slip down the inclined surfaces, e.g., plant leaves? The current explanation is based on the existence of surface inhomogeneities, which cause a sustaining force that pins the contact line. Following this theory, the drop remains in equilibrium until a critical value of the sustaining force is reached. We propose an alternative analysis, from the point of view of energy balance, for the particular case in which the drop leaves a liquid film behind. The critical angle of the inclined surface at which the drop slips down is predicted. This result does not depend explicitly on surface inhomogeneities, but only on the drop size and surface tensions. There is good agreement with experiments for contact angles below 90° where the formation of the film is expected, whereas for greater contact angles great discrepancies arise

Comparing Bone Microarchitecture by Trabecular Bone Score (TBS) in Caucasian American Women with and Without Osteoporotic Fractures.

Several cross-sectional studies have shown the ability of the TBS to discriminate between those with and without fractures in European populations. The aim of this study was to assess the ability of TBS to discriminate between those with and without fractures in a large female Caucasian population in the USA. This was a case-control study of 2,165 Caucasian American women aged 40 and older. Patients with illness or taking medications known to affect bone metabolism were excluded. Those in the fracture group (n = 289) had at least one low-energy fracture. BMD was measured at L1-L4, TBS calculated directly from the same DXA image. Descriptive statistics and inferential tests for difference were used. Univariate and multivariate logistic regression models were created to investigate possible association between independent variables and the status of fracture. Odds ratios per standard deviation decrease (OR) and areas under the ROC curve were calculated for discriminating parameters. Weak correlations were observed between TBS and BMD and between TBS and BMI (r = 0.33 and -0.17, respectively, p < 0.01). Mean age, weight, BMD and TBS were significantly different between control and fracture groups (all p ≤ 0.05), whereas no difference was noted for BMI or height. After adjusting for age, weight, BMD, smoking, and maternal and family history of fracture, TBS (but not BMD) remained a significant predictor of fracture: OR 1.28[1.13-1.46] even after adjustment. In a US female population, TBS again was able to discriminate between those with and those without fractures, even after adjusting for other clinical risk factors.

d'Arcolo [ou d'Argollo] sur American Excelsior [1000 cmc, concurrent de la course motocycliste Paris-Nice] : [photographie de presse] / [Agence Rol]

Référence bibliographique : Rol, 57963

The Iowa African-American Journal, July 1999, Vol. 5, no. 3

Newsletter for the Iowa Commission on the Status of African-Americans

The Iowa African-American Journal, January 2000, Vol. 6, no. 1

Newsletter for the Iowa Commission on the Status of African-Americans

The Iowa African-American Journal, July 2000, Vol. 6, no. 2

Newsletter for the Iowa Commission on the Status of African-Americans

The Iowa African-American Journal, November 2000, Vol. 6, no. 3

Newsletter for the Iowa Commission on the Status of African-Americans

The Iowa African-American Journal, Spring/Fall 2001, Vol. 7, no. 1

Newsletter for the Iowa Commission on the Status of African-Americans

The Iowa African-American Journal, Spring/Fall 2002, Vol. 8, no. 1

Newsletter for the Iowa Commission on the Status of African-Americans

The Iowa African-American Journal, Winter 2002/Spring 2003, Vol. 8, no. 2

Newsletter for the Iowa Commission on the Status of African-Americans

The Iowa African-American Journal, October 1999, Vol. 5, no. 4

Newsletter for the Iowa Commission on the Status of African-Americans

Iowa African-American Journal, Fall 2004, Vol. 10, no. 2

Newsletter for the Iowa Commission on the Status of African-Americans

Iowa African-American Journal, Spring 2004, Vol. 9, no. 1

Newsletter for the Iowa Commission on the Status of African-Americans

Iowa African-American Journal, Winter 2004, Vol. 10, no. 2

Newsletter for the Iowa Commission on the Status of African-Americans. Vol. 10, no. 2 also used for Fall 2004.