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Mesenteric vascular ischemia is a known complication of cocaine use. Although the majority of cases of cocaine-induced mesenteric ischemia present with ischemic colitis and rectal bleeding, several cases have been described presenting only with abdominal pain. We present a case of mesenteric vasoconstriction with angiographic documentation and treatment.
Hydrotreating Israeli shale oil at 150 atm, an LHSV of 0.5-1.5 h -1 , a temperature of 340-400°C, and a hydrogen to oil ratio of 1500 NL L -1 was studied in a trickle-bed reactor pilot plant packed with two novel catalysts in series. The first catalyst was Ni-Mo supported on wide-pore alumina and the second catalyst was Co-Mo-Cr supported on combined zeolite HY-alumina carrier...
The selectivity of several catalytic systems was studied. Shape selectivity of Pt on carbon-fiber catalysts was demonstrated in the competitive hydrogenation of 1-hexene and cyclohexene and in the parallel dehydrogenation of cyclohexanol to cyclohexanone and phenol. Both reactions were carried out in a gas-phase fixed-bed reactor. Catalysts prepared on carbon fibers, containing pores with small...
Artificial neural networks (ANN) are currently being explored in various engineering fields as valuable tools for automatic model-building and knowledge acquisition. This technique was applied to model hydrodesulfurization of atmospheric gas oil in a mini-pilot trickle-bed reactor. Sulfur removal was measured as a function of temperature, pressure and liquid hourly space velocity (LHSV) for three...
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