Urolithiasis and psoas abscess in a 2-year-old boy with type 1 glycogen storage disease

We report on a pyogenic psoas abscess secondary to an impacted calcium oxalate ureteric stone in a 2-year-old boy with glycogen storage disease type 1 (GSD-1). The patient had a drainage of the abscess through a flank incision followed by percutaneous nephrostomy and open ureterolithotomy. Metabolic acidosis, hyperuricemia, hypocitraturia, and hypercalciuria appear to be significant in the pathogenesis of urolithiasis in patients with GSD-1. Regular ultrasonography of the abdomen along with optimal metabolic control may delay or prevent urolithiasis and its complications in GSD-1 patients

Modelling capping of 28 mm beverage closures using finite element analysis

Understanding the performance of packaging on production lines is of course extremely important to the packaging industry. Computer simulation techniques have improved vastly in recent years, and modelling the complex interaction of three-dimensional threaded shapes, like closures, is now a reality. This paper outlines the work undertaken in understanding the possible mechanisms relating to the capping of 28 mm beverage closures and the use of experimental and computer simulations in order to establish that understanding

Optionality and Daily Dynamics of Convenience Yield Behavior: An Empirical Analysis

In this article I empirically examine the daily convenience yield behavior for six commodity markets (crude oil, heating oil, gasoline, wheat, corn, and copper). The results illustrate that convenience yield behavior can be statistically explained within an option pricing framework. However, because one of the assumptions of the standard call option formula is not fully satisfied by the observed convenience yield series, an alternative option-exchange option-may be more appropriate for modeling the daily convenience yield behavior. Furthermore, I empirically test two hypotheses on convenience yield behavior. The results confirm the assertion that the convenience yield is increasing in marginal production costs. In addition, the findings offer limited support for the hypothesis that the convenience yield is decreasing in the serial autocorrelation of spot prices. The observed switch in the sign of regression coefficients as the order of autocorrelation increases is attributed to the probable presence of mean reversion in these markets. 2004 The Southern Finance Association and the Southwestern Finance Association.

Constitutional interests in the face of innovations: how much do we need to know about risk preferences?

Constitutional preferences, Social contract, Original position, Innovation, Risk preferences, D72, H10, O33,