H AL - Academia.edu (original) (raw)
Papers by H AL
Industrial & Engineering Chemistry Research, 1997
A concise review of relevant experimental observations and modeling of high-pressure tricklebed r... more A concise review of relevant experimental observations and modeling of high-pressure tricklebed reactors, based on recent studies, is presented. The following topics are considered: flow regime transitions, pressure drop, liquid holdup, gas-liquid interfacial area and mass-transfer coefficient, catalyst wetting efficiency, catalyst dilution with inert fines, and evaluation of tricklebed models for liquid-limited and gas-limited reactions. The effects of high-pressure operation, which is of industrial relevance, on the physicochemical and fluid dynamic parameters are discussed. Empirical and theoretical models developed to account for the effect of high pressure on the various parameters and phenomena pertinent to the topics discussed are briefly described.
American Journal of Gastroenterology, 2002
Gallstone is a common disease with a 10% prevalence in the United States and Western Europe. Howe... more Gallstone is a common disease with a 10% prevalence in the United States and Western Europe. However, it is only symptomatic in 20 -30% of patients, with biliary pain "colic" being the most common symptom. Complications of asymptomatic gallstone disease are generally rare, with an incidence of Ͻ1%/yr. The most common complications of gallstone disease are acute cholecystitis, acute pancreatitis, ascending cholangitis, and gangrenous gallbladder. Less frequent complications include Mirizzi syndrome, cholecystocholedochal fistula, and gallstone ileus. Mirizzi syndrome and cholecystocholedochal fistula are two manifestations of the same process that starts with impaction of a gallstone in the gallbladder neck that results in obstruction of the bile duct, causing jaundice. The gallstone may erode into the bile duct, causing cholecystocholedochal fistula. Gallstone ileus refers to small bowel obstruction resulting from the impaction of one or more gallstones after they have migrated through a cholecystoenteric fistula. An accurate diagnosis is essential to the management and prevention of further complications. A variety of imaging and endoscopic modalities are used to make the diagnosis once the condition is suspected clinically. Treatment should be tailored to each individual patient. Management choices include ERCP, lithotripsy (endoscopic or extracorporeal), and surgery. Prognosis is frequently related to early recognition, management of any comorbid conditions, and careful selection of treatment modalities. (Am J Gastroenterol 2002;97: 249 -254.
La Conversación no suele caracterizarse por ser una sección que busque estar detrás de la última ... more La Conversación no suele caracterizarse por ser una sección que busque estar detrás de la última información. Sin embargo, nos hacemos espacio para dar cuenta de algunos problemas y temas importantes de actualidad. Para conversar un poco sobre el panorama económico argentino decidimos consultar a un especialista y nos pusimos en contacto con Alfredo Zaiat, periodista especializado en economía, director del suplemento Cash de Página 12, conductor de Cheque en Blanco y panelista de los programas Con Sentido Público y Guetap. (1)
Industrial & Engineering Chemistry Research, 1997
A concise review of relevant experimental observations and modeling of high-pressure tricklebed r... more A concise review of relevant experimental observations and modeling of high-pressure tricklebed reactors, based on recent studies, is presented. The following topics are considered: flow regime transitions, pressure drop, liquid holdup, gas-liquid interfacial area and mass-transfer coefficient, catalyst wetting efficiency, catalyst dilution with inert fines, and evaluation of tricklebed models for liquid-limited and gas-limited reactions. The effects of high-pressure operation, which is of industrial relevance, on the physicochemical and fluid dynamic parameters are discussed. Empirical and theoretical models developed to account for the effect of high pressure on the various parameters and phenomena pertinent to the topics discussed are briefly described.
American Journal of Gastroenterology, 2002
Gallstone is a common disease with a 10% prevalence in the United States and Western Europe. Howe... more Gallstone is a common disease with a 10% prevalence in the United States and Western Europe. However, it is only symptomatic in 20 -30% of patients, with biliary pain "colic" being the most common symptom. Complications of asymptomatic gallstone disease are generally rare, with an incidence of Ͻ1%/yr. The most common complications of gallstone disease are acute cholecystitis, acute pancreatitis, ascending cholangitis, and gangrenous gallbladder. Less frequent complications include Mirizzi syndrome, cholecystocholedochal fistula, and gallstone ileus. Mirizzi syndrome and cholecystocholedochal fistula are two manifestations of the same process that starts with impaction of a gallstone in the gallbladder neck that results in obstruction of the bile duct, causing jaundice. The gallstone may erode into the bile duct, causing cholecystocholedochal fistula. Gallstone ileus refers to small bowel obstruction resulting from the impaction of one or more gallstones after they have migrated through a cholecystoenteric fistula. An accurate diagnosis is essential to the management and prevention of further complications. A variety of imaging and endoscopic modalities are used to make the diagnosis once the condition is suspected clinically. Treatment should be tailored to each individual patient. Management choices include ERCP, lithotripsy (endoscopic or extracorporeal), and surgery. Prognosis is frequently related to early recognition, management of any comorbid conditions, and careful selection of treatment modalities. (Am J Gastroenterol 2002;97: 249 -254.
La Conversación no suele caracterizarse por ser una sección que busque estar detrás de la última ... more La Conversación no suele caracterizarse por ser una sección que busque estar detrás de la última información. Sin embargo, nos hacemos espacio para dar cuenta de algunos problemas y temas importantes de actualidad. Para conversar un poco sobre el panorama económico argentino decidimos consultar a un especialista y nos pusimos en contacto con Alfredo Zaiat, periodista especializado en economía, director del suplemento Cash de Página 12, conductor de Cheque en Blanco y panelista de los programas Con Sentido Público y Guetap. (1)