The motion of a stone skimming over a water surface is considered. A simplified description of the collisional process of the stone with water is proposed. The maximum number of bounces is estimated by considering both the slowing down of the stone and its angular stability. The conditions for a successful throw are discussed. © 2003 American Association of Physics Teachers. @DOI: 10.1119/1.151...

A 40-year-old man presented with right-sided flank pain of sudden onset and intermittent macroscopic haematuria that had been present for the past 3 months. He had had a hospital admission for a right ureteric stone 3 years previously, where some 'intervention' had been performed. He had been told to return for a follow-up visit, but had defaulted as he felt well after being discharged. The pat...

to investigate the effects of certain factors on the rate of retained placenta, 2844 calving records from 1288 holstein cows in a herd were used. these cows calved during year period of 2001 to 2007. a generalized statistical linear model was applied to analyze the data. logistic regression model was applied as the statistical model. in the model, fixed effects of year, season (warm or cold) an...

In an attempt to evaluate the selective intraoperative biliary imaging in patients with gall stone disease and suspected CBD stones., Patients with symptomatic gall stone disease presenting for laparoscopic cholecystectomy were prospectively studied for the safety and effectiveness of selective intraoperative cholangiogram (IOC) policy. 182 patients underwent laparoscopic cholecystectomy [140 f...

If the absolute number of poor people goes up, but the fraction of people in poverty comes down, has poverty gone up or gone down? The economist’s instinct, framed by population replication axioms that undergird standard measures of poverty, is to say that in this case poverty has gone down. But this goes against the instinct of those who work directly with the poor, for whom the absolute numbe...

PURPOSE To retrospectively assess the clinical utility in ureteroscopy (URS) planning of cumulative stone diameter (CSD), which does not account for stone width or depth, as a predictor of URS outcome and compare it with stone volume. MATERIALS AND METHODS Patients with renal stones treated at a single institute by flexible URS were retrospectively evaluated. To assess the clinical utility of...

BACKGROUND AND AIMS To determine the time to normalization of common bile duct (CBD) diameter after endoscopic sphincterotomy and stone extraction in patients with choledocholithiasis. METHODS Patients with CBD dilation due to choledocholithiasis were enrolled. CBD diameter was measured by transabdominal ultrasonography before, and repeated after one, three, six and twelve months after endosc...

It is undetermined when and how laparoscopic common bile duct exploration (LCBDE) should be used in patients with common bile duct (CBD) stone-related nonsevere acute cholangitis. We aimed to evaluate the effect of LCBDE on the clinical outcome of those patients within (early) or beyond (delayed) 72 hours of emergent admission. Surgery-related complications, length of hospital stay (LOS), and t...