Implementing digital archives: issues of trust

In recent years, much of the focus in archival literature and endeavour has been directed towards the management of digital records. The need to work closely with information and communication technology (ICT) professionals is essential if digital preservation aspirations are to be realised. However, consideration has not been given to the challenges inherent in being respected or trusted by this occupational group. As a preliminary step to identifying possible cultural differences, a survey was developed to investigate the perceptions of ICT professionals as regards digital archives and the role of recordkeepers. Findings from this survey show differences in the perception of trustworthiness in terms of abilities to manage paper versus digital records. In addition, responses also highlight risks inherent in developing digital archives which do not take access requirements sufficiently into account. We suggest that attention must be paid to this dimension of custody if digital archives initiatives are to succeed.     

Effect of tennis racket parameters on a simulated groundstroke

Composite materials have given manufacturers the freedom to develop a broad range of tennis rackets, allowing them to change key parameters such as the structural stiffness, mass, and position of the balance point. The aim of this research was to determine how changing these parameters could affect ball resultant rebound velocity and spin for a simulated groundstroke. A finite element model of a freely suspended racket and strings was used to determine the effect of racket parameters for oblique spinning impacts at a range of locations on the stringbed. The finite element simulations were conducted in the laboratory frame of reference, where the ball is projected onto an initially stationary racket. The mean rebound velocity of the ball was 9% higher for a structurally stiff racket, 37% higher for a heavy racket, and 32% higher for a head-heavy racket. In addition, the mean rebound topspin of the ball was 23% higher for a heavy racket and 21% higher for a head-heavy racket. Therefore, in relation to a groundstroke with an impact location away from the node, the rebound velocity of the ball is likely to increase with the structural stiffness of a racket. The effect of changing the mass and position of the balance point is more complex, as it is dependent on the relationship between the transverse moment of inertia and maximum pre-impact swing velocity.     

Initial hydration status, fluid balance, and psychological affect during recreational exercise in adults

There is little information on the impact of hydration status on the psychological response to exercise despite potential implications for adherence to an exercise programme and for overall health and fitness. We investigated initial hydration status, fluid balance, and psychological responses associated with a typical recreational exercise session in healthy adults. Fifty-two participants performed a freely chosen gymnasium-based exercise session at a fitness centre, with ad libitum access to fluids. Urine samples were collected on arrival for analysis of osmolality. Sweat loss was estimated from the change in body mass after correction for fluid intake and urinary losses. Subjective psychological ratings were recorded before and after exercise. Pre-exercise urine osmolality was above 900 mOsmol · kg(-1) (used as a threshold for hypohydration) in 37% of participants. Fluid intake during exercise was 390 ± 298 mL, while estimated sweat loss was 794 ± 391 mL. The percentage change from pre-exercise body mass was -0.62 ± 0.20%. Physically active adults who arrived to take part in exercise hypohydrated reported more negative changes in psychological affect in response to their subsequent freely chosen recreational exercise session than those classified as euhydrated prior to exercise (-0.2 ± 0.7 vs. 0.8 ± 0.7; P < 0.005).     

Documentary genre and digital recordkeeping: red herring or a way forward?

The purpose of this paper is to provide a preliminary assessment of the utility of the genre concept for digital recordkeeping. The exponential growth in the volume of records created since the 1940s has been a key motivator for the development of strategies that do not involve the review or processing of individual documents or files. Automation now allows processes at a level of granularity that is rarely, if at all, possible in the case of manual processes, without loss of cognisance of context. For this reason, it is timely to revisit concepts that may have been disregarded because of a perceived limited effectiveness in contributing anything to theory or practice. In this paper, the genre concept and its employability in the management of current and archival digital records are considered, as a form of social contextualisation of a document and as an attractive entry point of granularity at which to implement automation of appraisal processes. Particular attention is paid to the structurational view of genre and its connections with recordkeeping theory.