Abstract. We develop a general theory of the swelling kinetics of polymer gels, with the view that a polymer gel is a two-phase fluid. The model we propose is a free boundary problem and can be used to understand both contraction and swelling, including complete dissolving or dehydration of polymeric gels. We show that the equations of motion satisfy a minimum energy dissipation rate principle ...

the major objective in endodontic therapy is to disinfect the entire root canal system. this requires that the pulpal content be eliminated as sources of infection. this goal may be accomplished by mechanical instrumentation and chemical irrigation, in conjunction with medication of the root canal between treatment sessions. microorganisms and their by-products are considered to be the major ca...

Purpose. The work aims to study the effect of cellulose on caking properties various types coking coal used in blends. change abilities has been analyzed achieve aim using standard techniques. At same time, biomass additives plastic comprehensively; optimal amount additive for practical purposes determined. Methods. Multiple characteristics stage have studied a dilatometric method, enhanced swe...

Wood, as a biological material, is sensitive to environmental conditions and microorganisms; therefore, wood products require protective measures extend their service life in outdoor applications. Several modification processes are available for the improvement of properties, including commercially solutions. Among chemical treatments, acetylation by acetic anhydride one most effective methods ...

excessive production and stockpile of scrap tires cause some environmental and sanitary risks throughout the world. to manage these materials, possible use of soil-tire mixtures has been recently propounded in civil engineering projects. a few studies previously have been conducted to evaluate behavior of clay-tire mixtures, while swelling properties, consolidation and settlement characteristic...

this experiment was conducted with broiler chickens to evaluate the effects of high and low swelling bentonite (natural and processed by cuso4) supplementation in diets on performance and carcass traits. a total of 300 day-old aryan broiler’s chicks were used in a completely randomized design with 5 dietary treatments. six pen replicates of 10 chicks were assigned to each of five dietary treatm...

The physical properties of fish liver and rat liver mitochondria were compared as a function of temperature and osmotic pressure. The data indicate that fish mitochondria are more flexible and swell at a more rapid rate over a 0 to 30 degrees C temperature range, whereas the rates of swelling at 30 to 40 degrees C are comparable. The swelling rates of both fish and rat mitochondria vary with te...

By means of computerized tomography (CT) diffuse cerebral swelling has been shown to exist in the early stages of severe acute head injury. But, to our knowledge, it has not been intensively studied in blunt head trauma. The purpose of this study is to elucidate the clinical features, pathogenesis and outcome of the patients with diffuse cerebral swelling occurring in the case of blunt head tra...

Introduction............................................................................................................245 Polymer Swelling ..................................................................................................247 Ideas for Rapid Swelling.......................................................................................248 Superporous Hydrogels ....................

he association of inflammation with tumors was first noted nearly 2,000 years ago by Galen. Today, chronic inflammation caused by intestinal diseases such as colitis is known to be a major contributing factor to the onset of colon cancer. In a new report by Florian Greten, Michael Karin (University of California, San Diego, CA), and colleagues, NFB, an inflammation-inducing transcription factor...