Thinking Informatically

On being promoted to a personal chair in 1993 I chose the title of Professor of Informatics, specifically acknowledging Donna Haraway’s definition of the term as the “technologies of information [and communication] as well as the biological, social, linguistic and cultural changes that initiate, accompany and complicate their development” [1]. This neatly encapsulated the plethora of issues emanating from these new technologies, inviting contributions and analyses from a wide variety of disciplines and practices. (In my later work Thinking Informatically [2] I added the phrase “and communication”.) In the intervening time the word informatics itself has been appropriated by those more focused on computer science, although why an alternative term is needed for a well-understood area is not entirely clear. Indeed the term is used both as an alternative term and as an additional one—i.e. “computer science and informatics”

Slice Implies Mutant Ribbon for Odd, 5-Stranded Pretzel Knots

A pretzel knot $K$ is called $odd$ if all its twist parameters are odd, and $mutant$ $ribbon$ if it is mutant to a simple ribbon knot. We prove that the family of odd, 5-stranded pretzel knots satisfies a weaker version of the Slice-Ribbon Conjecture: All slice, odd, 5-stranded pretzel knots are $mutant$ $ribbon$. We do this in stages by first showing that 5-stranded pretzel knots having twist parameters with all the same sign or with exactly one parameter of a different sign have infinite order in the topological knot concordance group, and thus in the smooth knot concordance group as well. Next, we show that any odd, 5-stranded pretzel knot with zero pairs or with exactly one pair of canceling twist parameters is not slice.Comment: 31 pages, 9 figures. Version 2 includes results for pretzel knots with single-twists (strands with twisting parameter 1 or -1), which were not addressed in version 1. Version 2 also includes one new figure and fixes a few typo

Sustaining a focus on occupation in community mental health practice

Occupational therapists working in community mental health teams (CMHTs) are often challenged to justify their unique approach to health through occupation, within an environment that tends to press for generic working. Such a challenge requires practitioners to identify and communicate evidence that supports their unique occupational contribution. In the absence of extensive robust and relevant research evidence, it is suggested that the contribution of theoretical evidence be considered. This paper, therefore, explores the potential of occupational justice and its related concepts to provide the profession with a theoretical justification for occupational therapists adopting an occupation-focused role in CMHTs. It begins with an overview of how CMHTs, generic working and occupational science have evolved. The concept of occupational justice and its related risk factors are then analysed in relation to practice. The potential conflict between the professional commitment to client-centred practice and the generic worker model is also discussed. The paper concludes with recommendations for further exploration and consideration

The Effects of Non-Contingent Extrinsic and Intrinsic Rewards on Memory Consolidation

Emotional and arousing treatments given shortly after learning enhance delayed memory retrieval in animal and human studies. Positive affect and reward induced prior to a variety of cognitive tasks enhance performance, but their ability to affect memory consolidation has not been investigated before. Therefore, we investigated the effects of a small, non-contingent, intrinsic or extrinsic reward on delayed memory retrieval. Participants (n = 108) studied and recalled a list of 30 affectively neutral, imageable nouns. Experimental groups were then given either an intrinsic reward (e.g., praise) or an extrinsic reward (e.g., $1). After a one-week delay, participants’ retrieval performance for the word list was significantly better in the extrinsic reward groups, whether the reward was expected or not, than in controls. Those who received the intrinsic reward performed somewhat better than controls, but the difference was not significant. Thus, at least some forms of arousal and reward, even when semantically unrelated to the learned material, can effectively modulate memory consolidation. These types of treatments might be useful for the development of new memory intervention strategies

College Preparation for African American Students: Gaps in the High School Educational Experience

This report focuses on the deficiencies and disparities in school systems, particularly those with high-minority populations, that leave students unprepared for the rigors of college. It addresses three key areas that are critical for college readiness: the level of coursework available, the experience level of the teachers, and access to guidance counselors., and provides implications for public policy

Gasket Assembly for Sealing Mating Surfaces

A gasket assembly for securing a pair of surface together wherein an electrically conductive gasket base having a central opening is provided with a pair of layers secured to opposite sides of the gasket base, with the layers being a fusible alloy, a brazing alloy or a synthetic, thermoplastic material which will melt, without degrading, when the gasket base is heated. The surfaces may be secured to each other by a plurality of bolts to squeeze the gasket assembly there between or by some other clamping means. An electrical current is passed through the gasket base to heat it to a temperature sufficient to melt the layers to seal the surfaces to opposite sides of the gasket base

Music and dance as a coalition signaling system

Evidence suggests that humans have neurological specializations for music processing, but a compelling adaptationist account of music and dance is lacking. The sexual selection hypothesis cannot easily account for the widespread performance of music and dance in groups (especially synchronized performances), and the social bonding hypothesis has severe theoretical difficulties. Humans are unique among the primates in their ability to form cooperative alliances between groups in the absence of consanguineal ties. We propose that this unique form of social organization is predicated on music and dance. Music and dance may have evolved as a coalition signaling system that could, among other things, credibly communicate coalition quality, thus permitting meaningful cooperative relationships between groups. This capability may have evolved from coordinated territorial defense signals that are common in many social species, including chimpanzees. We present a study in which manipulation of music synchrony significantly altered subjects’ perceptions of music quality, and in which subjects’ perceptions of music quality were correlated with their perceptions of coalition quality, supporting our hypothesis. Our hypothesis also has implications for the evolution of psychological mechanisms underlying cultural production in other domains such as food preparation, clothing and body decoration, storytelling and ritual, and tools and other artifacts

Evaluation of LANDSAT-4 TM and MSS ground geometry performance without ground control

Techniques and software developed to characterize the Washington, D.C. scene were improved and are being systematically applied to an Imperial Valley, CA scene. Digital elevation files are being acquired. One hundred seventy-two tiepoints were located in the Imperial Valley scene. They were digitized from USGS maps to determine their lat-long coordinates. A least squares fit is currently being performed between line-sample image data and the lat-long positions of the tiepoints. Thematic mapper scanner sweeps were determined for the Imperial Valley P-data. VICAR jobs are currently under way to analyze sample-direction offsets between sweeps in the data, as well as band to band registration offsets. Tiepoint location is about to begin in the Harrisburg, PA scene

Sleep issues: Can EPs do more?

Sleep problems can have a significant impact on young people’s wellbeing. This article will focus specifically on sleep difficulties for adolescents, an age group for which sleep issues can receive much less professional attention. Evidence will be considered for sleep hygiene interventions whereby sleep routines and environments are considered key for good quality sleep and duration. This evidence base will then be critiqued for its applicability to young people with additional social, emotional and mental health needs. The aim is to highlight the importance of sleep for young people and to encourage Educational Psychologists to consider the issues for their practice

Arrest of flow and emergence of activated processes at the glass transition of a suspension of particles with hard sphere-like interactions

By combining aspects of the coherent and self intermediate scattering functions, measured by dynamical light scattering on a suspension of hard sphere-like particles, we show that the arrest of particle number density fluctuations spreads from the position of the main structure factor peak. Taking the velocity auto-correlation function into account we propose that as density fluctuations are arrested the system's ability to respond to diffusing momentum currents is impaired and, accordingly, the viscosity increases. From the stretching of the coherent intermediate scattering function we read a quantitative manifestation of the undissipated thermal energy, the source of those, ergodicity restoring, processes that short-circuit the sharp transition to a perfect glass.Comment: 9 pages, 4 figure