منابع مشابه
Short Time Periods
Earlier papers (Allen and Hayes 1985,1986) described a compact axiomatic theory which provided a formal basis for temporal reasoning. This theory makes a sharp distinction between time points and periods of time. We show here, by considering possible models of the theory, that it can be slightly extended to give a better fit to intuition. In particular, the extended theory is preserved under ch...
متن کاملShortening of the Short Refractory Periods in Short QT Syndrome
BACKGROUND Diagnosis of short QT syndrome (SQTS) remains difficult in case of borderline QT values as often found in normal populations. Whether some shortening of refractory periods (RP) may help in differentiating SQTS from normal subjects is unknown. METHODS AND RESULTS Atrial and right ventricular RP at the apex and right ventricular outflow tract as determined during standard electrophys...
متن کاملPurely Cubic Function Fields With Short Periods
A “function field version” of Voronoi’s algorithm can be used to compute the fundamental unit of a purely cubic complex congruence function field of characteristic at least 5. This is accomplished by generating a sequence of minima in the maximal order of the field. The number of mimima computed is the period of the field. Generally, the period is very large — it is proportional to the regulato...
متن کاملSelf-Controlled Case Series Analysis with Event-Dependent Observation Periods
The self-controlled case series method may be used to study the association between a time-varying exposure and a health event. It is based only on cases, and it controls for fixed confounders. Exposure and event histories are collected for each case over a pre-defined observation period. The method requires that observation periods should be independent of event times. This requirement is viol...
متن کاملEvaluating the effect of short ischemic periods on subsequent rat renal ischemic injury
Introduction: Using brief episodes of ischemia and reperfusion (IR) prior to a more sustained IR insult – ischemic preconditioning (IPC) – can reduce IR injury of the heart, brain and many other tissues. The purpose of present study was to investigate the effect of 2min ischemic periods on subsequent rat renal IR injury. Methods: Male rat's renal IR injury was investigated in a right nephrectom...
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ژورنال
عنوان ژورنال: Deutsches Aerzteblatt Online
سال: 2010
ISSN: 1866-0452
DOI: 10.3238/arztebl.2010.0841b