In web transport systems, the main concern is to independently control speed and tension in spite of perturbations such as radius variations and changes of setting points. So far, simulation models representing web handling systems have only dealt with continuously rolling web without considering friction between web and rollers. This article aims at introducing the modeling of friction as well...

This paper investigates the parametric stability of an axially moving web subjected to non-uniform in-plane edge excitations on two opposite, simply-supported edges. The web is modeled as a viscoelastic plate whose constitutive relation obeys the Kelvin-Voigt model, and the in-plane edge excitations are expressed as the sum of a static tension and a periodical perturbation. Due to the in-plane ...

The introduction of Java applets has taken the World Wide Web by storm. Java allows web creators to embellish their content with arbitrary programs which execute in the web browser, whether for simple animations or complex front-ends to other services. We examined the Java language and the Sun HotJava, Netscape Navigator, and Microsoft Internet Explorer browsers which support it, and found a si...

We examine the recent growth of social software (Web 2.0) and its initial impact on education, and offer a review of some of the recent research conducted in the evaluation of its pedagogical applications. We highlight the propensity of students to be both creative and destructive in their use of social software, particularly with wikis, web logs (blogs) and other text based environments. Stude...

Like many biomaterials, spider silk responds to water through softening and swelling. Major ampullate silk, the main structural element of most prey capture webs, also shrinks dramatically if unrestrained or develops high tension if restrained, a phenomenon called 'supercontraction'. While supercontraction has been investigated for over 30 years, its consequences for web performance remain cont...

in this research, the effect of tension wood formation in populus nigra on its anatomical characteristics was studied. vessel element and ray frequency (n/mm²), vessel diameter and ray dimensions were measured in both normal and tension wood. furthermore, the formation of gelatinous layer (g-layer) in the fibers of tension wood was studied. the results showed that the vessel proportion and diam...