Advances in personal computer technology have made powerful methods for the collection and analysis of patient information available to clinical users. This report details the development of a multi-user database distributed across a network of personal computers that facilitates operative scheduling, and collection and analysis of operative data. Clinicians from each surgical service in our medical center developed customized data entry programs that contribute information centrally through a telephone-line network to prepare the daily operative schedule. Subsequently, information from the operating rooms is added to the preoperative database to form an operative log, which is distributed to client services for further analysis and modification. This system has improved the efficiency and accuracy of operative scheduling and information management and shifted the burden of data collection away from the physician. Widespread availability of these data has contributed to the development of an effective quality improvement program and facilitated effective management of personnel and resources.
The solid-liquid phase diagram has been determined for the water + 2,5-dimethylhexane-2,5-diol system.A solid hydrate containing four moles of water for each mole of diol forms in the system and melts incongruently at 31 1.56 K. Differential scanning calorimetry was used to determine the enthalpy of fusion of the pure diol(27.9 kJ mol-l) and of the tetrahydrate (52.6 kJ mol-' of hydrate). The peritectic reaction accounts for 46 kJ mol-' of the enthalpy of fusion of the hydrate. Titration calorimetry was used to determine the AH at the peritectic temperature for the reaction of the solid diol with water to form the saturated solution (16.0 kJ mol-l). The above data were combined with enthalpy-of-fusion and heat-capacity data from the literature for water to obtain the AH at 31 1.56 K for the formation of the solid hydrate from the solid diol and solid water (-8 f 2 kJ mol-l).The hydrate system shows excellent promise for thermal-energy storage.
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