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Cholecystoenteric fistula (CF) is a rare complication of cholelithiasis. The aim of this study was to evaluate the safety and risk of complications when the laparoscopic approach is applied in patients with CF. A questionnaire was mailed to all surgeons with experience of >100 cholecystectomies working in Naples, Italy, and the neighboring area. Between(More)
The concept of recovering minerals from seawater has been proposed as a way of counteracting the gradual depletion of conventional mineral ores. Seawater contains large amounts of dissolved ions and the four most concentrated metal ones (Na, Mg, Ca, K) are being commercially extracted today. However, all the other metal ions exist at much lower(More)
The Hubbert model assumes that the worldwide production of crude oil will follow a bell-shaped curve. Oil prices are expected to increase, or even to spike up, at or after the production peak. However, the Hubbert model provides no description of price trends. We also lack historical data that can be used as a guide, since so far there have been no cases of(More)
A recent paper by Ferroni and Hopkirk (2016) asserts that the ERoEI (also referred to as EROI) of photovoltaic (PV) systems is so low that they actually act as net energy sinks, rather than delivering energy to society. Such claim, if accurate, would call into question many energy investment decisions. In the same paper, a comparison is also drawn between(More)
The well known “Hubbert curve” assumes that the production curve of a crude oil in a free market economy is “bell shaped” and symmetric. The model was first applied in the 1950s as a way of forecasting the production of crude oil in the US lower 48 states. Today, variants of the model are often used for describing the worldwide production of crude oil,(More)
BACKGROUND/AIMS Laparoscopic cholecystectomy is characterized by a higher incidence of iatrogenic biliary lesions. The Authors evaluate the role of hepaticojejunostomy in the treatment of iatrogenic biliary lesions following laparoscopic cholecystectomy in 51 patients observed in the Campania region, Italy from 1991 to 2003. METHODOLOGY The Authors report(More)
An higher incidence rate of iatrogenic bile duct injuries is reported in cholecystectomy performed with the laparoscopy than with the laparotomy approach. The aim of this study was to provide a multicentre report on surgical treatment and the outcome of biliary complications during and following laparoscopic cholecystectomy. A questionnaire was mailed to(More)
IntroductIon Energy is the key factor that drives the economy. Without abundant energy coming from sources other than human and animal muscles, the society as we know it would be unthinkable. Energy is needed to power all kinds of machinery, but also for the vital task of supplying the industrial system with the mineral commodities that make it function.(More)
One of the factors that led to the wide rejection of the 1972 ―Limits to Growth‖ report was the inability for most people to understand the model used in the study. In the present paper, the author builds simple ―mind sized‖ world models designed to convey to readers the main qualitative features of world modeling. These models turn out to provide results(More)