Diabetes care in the United States is suboptimal. Although closed-panel health maintenance organizations (HMOs) and the Department of Veterans Affairs (VA) report performance superior to national norms, fee-for-service performance is uncertain. To address this issue, 3 outcome and 5 process indicators were measured for 2010 Medicare diabetes patients across 22 sites in a large, fee-for-service primary care group practice. American Diabetes Association standards for glycemic control, low-density lipoprotein cholesterol, and blood pressure were met by 53%, 46%, and 19% of patients, respectively. Diabetes Quality Improvement Project/Alliance poor control markers for the same measures were exceeded by 9%, 20%, and 54% of patients. Chart abstraction demonstrated annual eye examination, foot examination, and nephropathy screening rates of 16%, 49%, and 38%, while Medicare claims showed an annual eye examination rate of 63%. Observed processes and outcomes in this fee-for-service setting were superior to reported national performance and similar to the best performance in staff-model HMOs and the VA.

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This paper describes a theory for a piston-operated compressor in which shock waves are used to heat the gas being compressed. Detailed calculations are given showing the use of such a compressor to heat air for use in a hypersonic wind tunnel. The effect of real gas properties on the compression process is included in this discussion.

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