Analogue emulation of power system load behaviour

In analogue emulation, a non-linear system model is implemented as a set of reconfigurable analogue circuits. This hardware is actuated, initialised and allowed to settle to a steady state, during which time the user utilises voltage and current measurement devices to observe the system's transient response and static solution. In this study, the authors present the advantages of analogue emulation over digital simulation for fast steady-state and dynamic power system analyses, as required in real-time network operation. They discuss the design, fabrication, construction and testing of a multi-bus power system emulator with focus on a reconfigurable analogue circuit to mimic load. They utilise circuit theory to analyse its operation and present a set of design modifications aimed at improved accuracy.     

Use of a rate-limited ultrafiltration circuit with centrifugal ventricular assist

Renal insufficiency and pulmonary edema are frequently observed in patients who require centrifugal ventricular assist for postcardiotomy ventricular failure. We describe a technique of using a rate-limited ultrafiltration device in parallel with the assist device circuit to remove excess intravascular volume.     

Associative structure and the serial reproduction experiment.

This study investigates the changes that occur in the serial reproduction of lists of words that vary in their associational relationship with each other. Lists of words were presented to groups of Ss; the results were based on the responses of the group as a whole. It was hypothesized that the closer the association relationship of words, the greater the ease of recall; the less the relationship, the greater the intrusion of idiosyncratic responses. The hypothesis was, to a great extent, confirmed. The results are related to the nature of social communication. From Psyc Abstracts 36:04:4CL95D. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Behavior and fact.

Advances in the study of cognition and psycholinguistics have been hampered (1) by the mistaken insistence that psychology is the science of behavior, and (2) by adherence to an independent-dependent variable model of experimental psychology, 1 derived from physical sciences but inappropriate to all but a minority of psychological problems. It is stated that certain concepts which have no behavioral status at all, e.g., understanding, are critical to a nontrivial account of cognitive and psycholinguistic problems. By way of illustration, understanding is shown to be different from interpretation and even more fundamental to linguistic processing. It leads to interpretation, which concerning language, has a semantic component different in nature from syntactic and other linguistic components. It is argued that the semantic component in interpretation consists of the application of certain fundamental structures, called categories after the Kantian model, to linguistic information. (PsycINFO Database Record (c) 2010 APA, all rights reserved)