Max Johnson | York St John University (original) (raw)
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Papers by Max Johnson
Journal of General Internal Medicine, 1997
The objective of this project was to compare faculty productivity in teaching and nonteaching cli... more The objective of this project was to compare faculty productivity in teaching and nonteaching clinical settings. We hypothesized that teaching activity would have no impact on productivity. A mixed model, repeated measures analysis of variance was used to analyze average relative value units (RVUs) billed and to test for differences between clinics. Data were drawn from 4.956 clinical encounters made within a student, resident, and faculty clinic. Average RVUs per visit were similar in the three settings. Resident supervision increased faculty productivity, while student supervision had no impact on billed RVUs. Thus, RVUs can be used as a measure of faculty clinical productivity in different settings in an academic medical center. Precepting students does not appear to affect clinical productivity.
Journal of Catalysis, 1986
Porous aluminophosphates, which are useful as catalyst supports for polymerization, isomerization... more Porous aluminophosphates, which are useful as catalyst supports for polymerization, isomerization, or other hydrocarbon conversions, can be made by coprecipitation when an acidic solution of Al3+ and PO:-ions is neutralized. When the P/Al ratio in solution is equal to or greater than one, AlPOd is obtained often as a crystalline material, leaving the excess phosphate in solution. However, when excess Al'+ is present in solution (P/Al < 1) then it also precipitates and the resulting support retains a similar P/Al ratio to that in solution. In this study the structure of such aluminophosphates has been examined by means of X-ray diffraction and high resolution solid state NMR spectroscopy using both *'Al and 3'P nuclei. These materials are not simple coprecipitated mixtures of Alz03 and AlPOd. In fact, no evidence for the presence of either species was detected. Instead they appear to be amorphous structures in which the phosphate is randomly dispersed, and the aluminum exists in one octahedral and several different tetrahedral environments. Results from ethylene polymerization over these catalysts also support this view.
Journal of General Internal Medicine, 1997
The objective of this project was to compare faculty productivity in teaching and nonteaching cli... more The objective of this project was to compare faculty productivity in teaching and nonteaching clinical settings. We hypothesized that teaching activity would have no impact on productivity. A mixed model, repeated measures analysis of variance was used to analyze average relative value units (RVUs) billed and to test for differences between clinics. Data were drawn from 4.956 clinical encounters made within a student, resident, and faculty clinic. Average RVUs per visit were similar in the three settings. Resident supervision increased faculty productivity, while student supervision had no impact on billed RVUs. Thus, RVUs can be used as a measure of faculty clinical productivity in different settings in an academic medical center. Precepting students does not appear to affect clinical productivity.
Journal of Catalysis, 1986
Porous aluminophosphates, which are useful as catalyst supports for polymerization, isomerization... more Porous aluminophosphates, which are useful as catalyst supports for polymerization, isomerization, or other hydrocarbon conversions, can be made by coprecipitation when an acidic solution of Al3+ and PO:-ions is neutralized. When the P/Al ratio in solution is equal to or greater than one, AlPOd is obtained often as a crystalline material, leaving the excess phosphate in solution. However, when excess Al'+ is present in solution (P/Al < 1) then it also precipitates and the resulting support retains a similar P/Al ratio to that in solution. In this study the structure of such aluminophosphates has been examined by means of X-ray diffraction and high resolution solid state NMR spectroscopy using both *'Al and 3'P nuclei. These materials are not simple coprecipitated mixtures of Alz03 and AlPOd. In fact, no evidence for the presence of either species was detected. Instead they appear to be amorphous structures in which the phosphate is randomly dispersed, and the aluminum exists in one octahedral and several different tetrahedral environments. Results from ethylene polymerization over these catalysts also support this view.