Development of a Testing Procedure for Gloss Ink Holdout

There is currently no standard acceptable method used to evaluate gloss ink holdout. Four methods are investigated to evaluate holdout. Heat seat ink is used to reduce absorption effects. The K&N ink smear test and the Vanceometer absorption tester are both discounted as inappropriate tests since they look at absorption alone and have widely varied results. The IGT printability tester is an improvement because it involves another major influence to holdout, printing pressure, but does not hold the ink film thickness constant. The Vandercook Proof Press procedure is judged the most valuable since it takes into account printing pressure and absorption, and holds the ink film thickness constant. It also is the closest approximation to the industrial setting

Censorship: the Key to Lock-In?

Markets for information and entertainment are frequently characterized by increasing returns to scale in production and distribution. This implies that incumbent technologies enjoy an advantage over newcomer technologies; such markets can become locked into an inferior technology. Governments often heavily influence media markets through both direct ownership and censorship. I present a dynamic model with heterogeneity among consumers and firms in order to analyze the role of censorship in media markets. I assume there is a negative consumption externality across consumers and a negative cost spillover which an incumbent producer imposes on a newcomer. In a decentralized equilibrium, there is over-production of media from the incumbent technology. This reduces consumer utility and engenders lock-in of the inferior incumbent technology. I model censorship as a tax on information produced under the incumbent technology. A central planner who censors incumbent media can improve upon the decentralized equilibrium by reducing negative consumption externalities and unlocking the superior technology. I also show that censorship is only Pareto optimal when coupled with lump-sum transfers across consumers.

The role of shock induced trailing-edge separation in limit cycle oscillations

The potential role of shock induced trailing edge separation (SITES) in limit cycle oscillations (LCO) was established. It was shown that the flip-flop characteristics of transition to and from SITES as well as its hysteresis could couple with wing modes with torsional motion and low damping. This connection led to the formulation of a very simple nonlinear math model using the linear equations of motion with a nonlinear step forcing function with hysteresis. A finite difference solution with time was developed and calculations were made for the F-111 TACT were used to determine the step forcing function due to SITES transition. Since no data were available for the hysteresis, a parameter study was conducted allowing the hysteresis effect to vary. Very small hysteresis effects, which were within expected bounds, were required to obtain reasonable response levels that essentially agreed with flight test results. Also in agreement with wind tunnel tests, LCO calculations for the 1/6 scale F-111 model showed that the model should have not experienced LCO

How people find videos

At present very little is known about how people locate and view videos 'in the wild'. This study draws a rich picture of everyday video seeking strategies and video information needs, based on an ethnographic study of New Zealand university students. These insights into the participants' activities and motivations suggest potentially useful facilities for a video digital library

The use of paper in everyday student life

The information we encounter in modern life, in developed countries, is a hybrid of the physical and the digital. Personal archiving tools allow users to capture and retrieve aspects of their everyday lives in digital form. In this paper we use a diary study of students’ interactions with paper-based information to inform the design of such archiving tools

Exploring social music behaviour: An investigation of music selection at parties

This paper builds an understanding how music is currently listened to by small (fewer than 10 individuals) to medium-sized (10 to 40 individuals) gatherings of people— how songs are chosen for playing, how the music fits in with other activities of group members, who supplies the music, the hardware/software that supports song selection and presentation. This fine-grained context emerges from a qualitative analysis of a rich set of participant observations and interviews focusing on the selection of songs to play at social gatherings. We suggest features for software to support music playing at parties

Age and schooling effects on early literacy and phoneme awareness

Previous research on age and schooling effects is largely restricted to studies of children who begin formal schooling from the age of 6 and the measures of phoneme awareness used have typically lacked sensitivity for beginning readers. Our study addresses these issues by testing children aged 4-6 (first two years of formal schooling in the UK) on a sensitive dynamic measure of phoneme awareness and tests of early literacy. There were significant effects of both age and schooling on dynamic and static measures of phoneme awareness, word reading, spelling and letter-name knowledge but no significant age × time interactions. This indicates that older children within this age group generally outperform their younger classmates (although they do not make faster progress), and that this advantage is developed prior to the start of school

Online legacy preservation for humanities researchers

As researchers retire or pass away, the online record of their work and their research careers begins to fragment and fade away. We begin with case studies of four New Zealand Humanities researchers, nearing or at the ends of their active careers. What materials currently exist that they believe are essential to detail the results of their research, and that convey the ‘story’ of their work

Finding video on the web

At present very little is known about how people locate and view videos. This study draws a rich picture of everyday video seeking strategies and video information needs, based on an ethnographic study of New Zealand university students. These insights into the participants’ activities and motivations suggest potentially useful facilities for a video digital library

Vortex flow hysteresis

An experimental study was conducted to quantify the hysteresis associated with various vortex flow transition points and to determine the effect of planform geometry. The transition points observed consisted of the appearance (or disappearance) of trailing edge vortex burst and the transition to (or from) flat plate or totally separated flows. Flow visualization with smoke injected into the vortices was used to identify the transitions on a series of semi-span models tested in a low speed tunnel. The planforms tested included simple deltas (55 deg to 80 deg sweep), cranked wings with varying tip panel sweep and dihedral, and a straked wing. High speed movies at 1000 frames per second were made of the vortex flow visualization in order to better understand the dynamics of vortex flow, burst and transition