A case of unilateral renal lymphosarcoma in a cat

Senior seminar (D.V.M.) -- Cornell University, 1978. Includes bibliographical references (leaf 6).Feline lymphosarcoma is the most common neoplastic disease affecting cats. The clinical manifestation of the disease is extremely variable but it will generally appear in one or more of four pathological patterns: mediastinal, multicentric, abdominal, or leukemic form. The abdominal form of lymphosarcoma may involve mesenteric lymph nodes, the terminal ileum, liver, spleen, or kidneys. Cats with the renal form of lymphosarcoma usually have severe involvement of both kidneys.12 Investigators at the Angell Memorial Animal Hospital in Boston corroborate the invariability of bilateral kidney involvement. The following report presents a case of unilateral renal lymphosarcoma in a cat. The case was unique in that the disease was amenable to surgical Intervention

Effects of Increasing the Time to Reinforcement on Interval Timing in Rats

The experiment examined interval timing in rats during a momentary, unsignaled, increase in the time to reinforcement. A session began with intervals programmed according to a fixed interval (FI) 60 s reinforcement schedule, changed to either an FI 90 s, FI 120 s, or FI 180 s schedule at an unpredictable point, and then returned to an FI 60 s schedule after 1, 8, or 24 successive long intervals had elapsed. Overall, postreinforcement wait time duration increased with increases in the scheduled time to reinforcement. The amount by which wait time increased did not depend on the duration of longer intervals, but did depend on the number of longer intervals intercalated into a session. The results indicate that rats are sensitive to moment-by-moment changes in the time to reinforcement and support other studies showing an asymmetry between timing upward and downward shifts in the criterion for reinforcement of an FI schedule

Large-Eddy Simulation of Diesel Spray Combustion with Exhaust Gas Recirculation

A Large-Eddy Simulation (LES) study of the transient combustion in the spray H experiment investigated in the frame of the Engine Combustion Network (ECN) is presented. Combustion is modeled using a LES formulation of the ADF-PCM approach, the principle of which is to tabulate approximated diffusion flames based on the flamelet equation to account for complex chemical effects. The liquid phase is resolved with an Eulerian mesoscopic approach coupled with the DITurBC model for the injection. The structure of the combustion resulting from the n-heptane liquid fuel jet is investigated and compared to the literature. A very good reproduction of experimental findings by the presented LES approach is reported for small EGR rates. Albeit the qualitative effect of increasing the EGR rate is captured, the quantitative quality of the LES predictions deteriorates with increasing EGR rate. One possible explanation for this poor reproduction of EGR effects might be related to the fact that the used semi-detailed scheme was not validated for high EGR rates

Large-Eddy Simulation of Diesel Spray Combustion with Exhaust Gas Recirculation

A Large-Eddy Simulation (LES) study of the transient combustion in the spray H experiment investigated in the frame of the Engine Combustion Network (ECN) is presented. Combustion is modeled using a LES formulation of the ADF-PCM approach, the principle of which is to tabulate approximated diffusion flames based on the flamelet equation to account for complex chemical effects. The liquid phase is resolved with an Eulerian mesoscopic approach coupled with the DITurBC model for the injection. The structure of the combustion resulting from the n-heptane liquid fuel jet is investigated and compared to the literature. A very good reproduction of experimental findings by the presented LES approach is reported for small EGR rates. Albeit the qualitative effect of increasing the EGR rate is captured, the quantitative quality of the LES predictions deteriorates with increasing EGR rate. One possible explanation for this poor reproduction of EGR effects might be related to the fact that the used semi-detailed scheme was not validated for high EGR rates

Large-Eddy Simulation of Diesel Spray Combustion with Exhaust Gas Recirculation

A Large-Eddy Simulation (LES) study of the transient combustion in the spray H experiment investigated in the frame of the Engine Combustion Network (ECN) is presented. Combustion is modeled using a LES formulation of the ADF-PCM approach, the principle of which is to tabulate approximated diffusion flames based on the flamelet equation to account for complex chemical effects. The liquid phase is resolved with an Eulerian mesoscopic approach coupled with the DITurBC model for the injection. The structure of the combustion resulting from the n-heptane liquid fuel jet is investigated and compared to the literature. A very good reproduction of experimental findings by the presented LES approach is reported for small EGR rates. Albeit the qualitative effect of increasing the EGR rate is captured, the quantitative quality of the LES predictions deteriorates with increasing EGR rate. One possible explanation for this poor reproduction of EGR effects might be related to the fact that the used semi-detailed scheme was not validated for high EGR rates