Background: Surgical mortality data are collected routinely in high-income countries, yet virtually no low-or middle-income countries have outcome surveillance in place. The aim was prospectively to collect worldwide mortality data following emergency abdominal surgery, comparing findings across countries with a low, middle or high Human Development Index (HDI).Methods: This was a prospective, multicentre, cohort study. Self-selected hospitals performing emergency surgery submitted prespecified data for consecutive patients from at least one 2-week interval during July to December 2014. Postoperative mortality was analysed by hierarchical multivariable logistic regression.

Pass transistor logic (PTL)

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This paper describes the application of the Local Vector (IV) non-linear control strategy to a load simulator for an AC drive system. The load simulator physically consists of a computer controlled DC machine which is connected to the AC machine under test by a rigid shaft. With appropriate control the DC machine load is able to simulate static loads, first order dynamic loads (i.e. loads with varying J, f), and second order dynamic loads (i.e. rotating loads connected to the test machine via a compliant shaft). This paper presents SIMULINK simulations of the proposed control system and discusses some implementation issues.

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