Predistortion and enhancement of high-frequency peak limited MAC video signals

The use of phase predistortion to reduce the smearing caused by high-peak limiting is described, and results for transmission through a 9 MHz RF channel are presented.     

A comparison of the aromas of six coffees characterised by conventional profiling,free-choice profiling and similarity scaling methods

A selected panel, trained in sensory procedures, used a previously developed vocabulary to profile the aromas of six ground coffees. The same coffees were also examined by a different panel of assessors not familiar with coffees, using free-choice profiling and, on a separate occasion, similarity scaling procedures. The data from the three experiments were independently subjected to the appropriate statistical techniques to produce two-dimensional diagrams showing the interrelationships of the samples. All three procedures produced similar information both in respect to the way the coffees grouped and differed from one another. The paper concludes by discussing the assessor variation associated with each of the procedures and shows that free choice profiling compares very favourably with the other two.     

Assessment of lipid oxidation in indonesian salted-dried marine catfish (Arius thalassinus)

Analysis of Indonesian salted-dried catfish (Arius thalassinus Ruppell) during processing and storage indicates that although peroxide, thiobarbituric acid and anisidine values give an indication of the onset of lipid oxidation, the values become negligible in the consumed product. Alternative methods have been developed and the signijcant, steady increases found in the levels of acetic acid soluble colour and fluorescence indicate that these parameters are realistic indicators of the tertiary products formed by interactions of carbonyl compounds with amino type compounds. These increases are complemented by a fall in the level of free amino acids during storage of the product. A 30 % loss of polyunsaturated fatty acids was found during salting, but no subsequent loss was found during drying and storage.     

Making the most of your software

With revenues of more than $200 billion and a growth rate of 13% per year — software is one of the world's fastest growing industries. It is also one of the most vulnerable. The lack of awareness in the industry regarding software protection remains a great mystery. Even the humblest inventor will seek to first protect before he proceeds with his product or at least will try to find out what protection he might obtain. Not so, it would appear in the software business. Yet the issues of ownership and infringement are of every day importance to those involved in this sector.     

The (mis)measurement of restraint: An analysis of conceptual and psychometric issues.

In this article we examine alleged conceptual and psychometric deficiencies of the Restraint Scale, an instrument intended to identify chronic dieters. These deficiencies include the confounding of restraint with disinhibition, the inapplicability of the scale to obese samples, problems with the factor structure of the scale, and difficulties in completing the scale. We argue that these alleged deficiencies are in most cases chimerical and that the Restraint Scale remains the most useful tool for examining behavioral and other dieter/nondieter differences. Proposed alternatives to the Restraint Scale are examined and found to be inadequate as replacements, although they may be useful for certain purposes. Closer attention to the intended purpose of such instruments may serve to dispel controversy and confusion. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Personality and cognitive ability predictors of performance in graduate business school.

A cross-validation study is reported in which both personality variables and cognitive ability variables were evaluated as predictors of 2 separate performance criteria in a sample of 450 Master of Business Administration students. Whereas verbal and quantitative aptitudes of the students were found to be strong predictors of performance at written work, they were weak predictors of an in-class performance criterion. The opposite was true when specific personality trait variables were used as predictors. The personality characteristics of the students predicted classroom performance better than they predicted written performance. The Big Five factors of personality (Extraversion, Agreeableness, Conscientiousness, Neuroticism, and Openness to Experience) did not predict either criterion consistently. In conclusion, personality variables are related to academic success when characteristic modes of behavior play a role in academic performance. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Effects of treatment duration and severity of depression on the effectiveness of cognitive-behavioral and psychodynamic-interpersonal psychotherapy.

A total of 117 depressed clients, stratified for severity, completed 8 or 16 sessions of manualized treatment, either cognitive-behavioral psychotherapy (CB) or psychodynamic-interpersonal psychotherapy (PI). Each of 5 clinician-investigators treated clients in all 4 treatment conditions. On most measures, CB and PI were equally effective, irrespective of the severity of depression or the duration of treatment. However, there was evidence of some advantage to CB on the Beck Depression Inventory. There was no evidence that CB's effects were more rapid than those of PI, nor did the effects of each treatment method vary according to the severity of depression. There was no overall advantage to 16-session treatment over 8-session treatment. However, those presenting with relatively severe depression improved substantially more after 16 than after 8 sessions. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

The role of egg yolk lipoproteins in fatless sponge cake making

The question of lipid release and destabilisation of egg yolk lipoproteins has been examined (a) as a function of temperature in the absence and presence of sucrose and (b) during the fatless sponge cake making. Accessibility of lipids to n-hexane was used as a criterion of lipoprotein destabilisation. Yolk plasma is more susceptible to lipoprotein destabilisation than whole yolk at high sucrose concentrations between 70 and 100°C. During baking, yolk lipoproteins are destabilised in a random manner with over 40% of the lipids being released towards the finishing stages of cake structure development. The lipid release does not become significant until 110°C, rises sharply above 110–120°C and appears to correlate with water loss. It is predominant in regions nearer the cake periphery and in the final stages of cake structure development.     

Some aspects of PVC paste rheology

Using the Weissenberg rheogoniometer, a technique has been developed which facilitates the measurement of shear stress data and which substantially overcomes the problem of sample loss that normally occurs at high shear rates. Using this technique, the apparent viscosities of PVC pastes based upon four different PVC paste polymers plasticized with dialphyl phthalate have been determined at a number of shear rates up to 9000 sec^?1 and the viscosity aging characteristics of these paste polymers have been compared. The effect of several common plasticizers upon PVC paste viscosity and viscosity aging have been studied at shear rates of the order of 10 sec^?1 and 1000 sec^?1.     

Age differences in source forgetting: Effects on reality monitoring and on eyewitness testimony.

Age differences in memory for the source of memories were investigated using two different experimental paradigms. Experiment 1 used a reality monitoring paradigm. A series of actions were either performed, imagined, or watched, and subjects were later tested for their ability to recognize the actions and identify their origins. Elderly subjects made more false positive responses than did young subjects, and they made more source confusion errors, attributing actions to the wrong sources. Both new and imagined actions were most often misclassified as watched. Experiment 2 used an eyewitness testimony paradigm. After watching a film, subjects read a written version of the story. A recognition test showed that elderly subjects were more often misled by false information in the story than were the younger subjects, and were more confident that their erroneous responses were correct. The findings suggest that a decline in memory for sources may diminish the accuracy of elderly witnesses. (PsycINFO Database Record (c) 2010 APA, all rights reserved)