Accounting for Individual Effort in Cooperative Learning Teams

An “autorating” (peer rating) system designed to account for individual performance in team projects was used in two sophomore‐level chemical engineering courses in which the students did their homework in cooperative learning teams. Team members confidentially rated how well they and each of their teammates fulfilled their responsibilities, the ratings were converted to individual weighting factors, and individual project grades were computed as the product of the team project grade and the weighting factor. Correlations were computed between ratings and grades, self‐ratings and ratings from teammates, and ratings received and given by men and women and by ethnic minorities and non‐minorities. Incidences of “hitchhikers” (students whose performance was considered less than satisfactory by their teammates), “tutors” (students who received top ratings from all of their teammates), dysfunctional teams, and teams agreeing on a common rating were also determined. The results suggest that the autorating system works exceptionally well as a rule, and the benefits it provides more than compensate for the relatively infrequent problems that may occur in its use.     

Duchenne de Boulogne

Abstract

In this 1986 article ‘The Body and the Archive’, Alan Sekula argues that the Essays on Physiognomy of Johann Casper Lavater, which were published in the 1770s, helped to establish a belief that was augmented and elaborated during the nineteenth century through the use of photography.¹ To give an example, Francis Galton based much of his photographic work on the premise that the surface of the body could provide an observer with clues about the inner character of an individual, a virtually timeless supposition that Lavater had revived and systematized. Of course, nineteenth-century physiognomic studies aimed to corroborate a wide range of assumptions about the social and biological status of the individual, which may be seen as responses to the socioeconomic needs of the time — Galton's eugenic theories are generally cast against the background of growing, impoverished urban populations in the second half of the century.² Nevertheless, Lavater's original delineation of the subject of physiognomy may provide us with a valuable starting point for the study of nineteenth-century work in that area, and this holds true when we come to examine the work of Duchenne of Boulogne, whose Le Mçcanisme de la Physionomie Humaine was published in Paris in 1862.     

Adhesion-Induced Interactions between Micron-Sized Zirconia or Carbon Spheres and Melamine-Cross-Linked Polyester Surfaces

The thermodynamic work of adhesion between micron-sized zirconia or carbon spheres and polyester-melamine surfaces was determined using the Johnson-Kendall-Roberts (JKR) relationship, after first validating the JKR approach for this system. The calculated works of adhesion for both zirconia and carbon were similar for any given substrate composition and were found to be approximately 35 mJ/m² at low melamine concentrations, close to theoretical predictions. The apparent work of adhesion decreased with increasing melamine concentration, most likely due to the presence of a glassy melamine-rich surface layer, which is not representative of the bulk. The value found for low melamine concentration was assumed to be a true value for cocondensed polyester-melamine, and this was used to estimate surface modulus and the amount of excess melamine in the surface as a function of bulk composition.     

Memory loss resulting from fornix and septal damage: Impaired supra-span recall but preserved recognition over a 24-hour delay.

Despite increasing evidence that the fornix is important for memory, uncertainty remains about the exact nature of subsequent impairments arising from damage to this tract. This uncertainty is often created by pathology in additional brain structures. The present study involved a young man, DN, who had almost complete bilateral loss of the rostral columns of the fornix and much of the surrounding septum in the left hemisphere following the surgical removal of a cavernous angioma. Quantitative MRI analyses of structure size, normalized to intracranial volume, showed no difference in any of the additional brain regions measured, apart from those areas removed to expose the tumor. DN showed a marked, stable anterograde memory impairment that was still present 4 years postsurgery. In contrast, DN performed within normal levels on most tests of recognition memory. This sparing was most striking when given a 24-hr delay between study and test of the Warrington Recognition Memory Test. This recall/recognition dissociation provides further evidence for neuroanatomical divisions within recognition memory processes. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Real time small-angle X-ray scattering from polystyrene crazes during fatigue

Real time small-angle X-ray scattering (SAXS) from polystyrene (PS) crazed in cyclic three-point bending is investigated using intense X-ray radiation from the Cornell High Energy Synchrotron Source, CHESS. The SAXS patterns are recorded using a two-dimensional image intensifier/TV camera/video tape recorder system, operating at 30 frames/sec. At the maximum of the load cycle the SAXS pattern has a well defined streak normal to the craze fibrils. During the unloading portion of the cycle, however, the streak decreases in intensity and is spread into a diffuse fan. The loss of intensity is due to the decrease in volume of craze matter in the beam as the craze closes while the spreading of the diffraction pattern is due to the disorientation of the craze fibrils as they buckle in response to compression by the surrounding polymer matrix. Whilst reloading of the sample causes a relatively narrow SAXS streak to reappear, at the maximum load irreversible changes occur in the pattern from one cycle to the next. These changes are due to both an increase in craze fibril volume in the beam (craze growth) and to fibril breakdown and permanent disorientation.     

Productivity Through Automation

Productivity improvements in systems development can be made through the adoption of computer-aided software engineering (CASE), data design, and prototyping tools. How much these tools contribute to increased productivity in systems design, however, relies mostly on careful evaluation and selection of these tools as well as an evaluation of their impact on the designer or analyst who will be using the tool and on the development methodology itself.     

Budgets, Blood, and Turnips

Although the need for new systems (instead of constant maintenance of older systems) is often quite apparent to the MIS department, their advantages are not so readily realized by senior management -which sees only costs and risks instead of benefits. As a result, MIS managers must prove the costs and benefits of such projects. This column examines the difficulty of measuring the costs and benefits of four generations of systems -batch, online, DBMS based, and maintenance motivated - and explains why MIS managers should not only rewrite old systems but turn their attention toward the development of new and innovative systems.     

Minor houses/minor architecture

Deleuze and Guattari develop a notion of “minor literature” in their short book on Kafka, and the opposition major/minor has been used with varying degrees of success by critics working in a range of disciplines including architectural theory. Teasing out the potentially subversive implications of the major/minor opposition requires reading it in relation to other binarisms developed by Deleuze and Guattari in those same years, e.g., state/nomadic science, striated/smooth space, optic/haptic, as well as Guattari’s useful concept “machinic heterogenesis.” Then, one ends up with a minor architecture concerned with partially subversive practices rather than with structure per se. A building’s minor status is figured through its deployment in and production of a space that is a technological, social and political pattern as well as a line of flight. This paper reads minor architecture by examining the minor house built by Henry David Thoreau at Walden Pond and those currently being assembled by the Mad Housers in Atlanta, Georgia.