An elastomer is a polymer with the property of viscoelasticity, generally having notably low Young's modulus and high yield strain compared with other materials.  Elastomers, in particular rubbers, are used in a wide variety of products ranging from rubber hoses, isolation bearings, and shock absorbers to tires. Rubber has good properties and is thermal and electrical resistant. We used carbon ...

This study analyzes the influence of boron in presence chromium, vanadium, and titanium on changes tribological properties low-alloy casting steels caused by structural modifications brought about above elements. Eight grades cast were manufactured based designed chemical composition. The wear behavior these materials was investigated with GOST (Russian) standard test equipment, which steel sam...

Selective breeding produced four replicate lines of high-runner (HR) mice that run on wheels for approximately 2.7 times more revolutions per day than four unselected control lines. Previous studies found that HR mice of both sexes have lower body fat (isotope dilution at 15 wk of age) and that males (females not studied) have smaller retroperitoneal fat pads (17 wk). HR mice also exhibit eleva...

In this study, the interaction between the silica filler and polydimethylsiloxanes (PDMS) was investigated from the aspects of the bound rubber and morphological characterization. With special attention to the dynamic properties, the dynamic test was conducted by dynamic shear rheometer. The results show that the modified fillers disperse uniformly within PDMS matrix without aggregation and con...

The Flory-Reimer t heory for isotropic swelling of rubber crosslinked in t he dry state is extended to an anisotropic system crosslinked in t he dry, oriented state . The new parameters introduced into t he equation can be readily determined from dimensional changes of the fiber in a s ui table solvent using a photomicrographic te::hnique. Unlike other method3, s uch as the cathetometric and we...

The main objective of this study was a bio-economic survey of artisanal fishing so as to compare average profit of the fishermen, in two different environments (reservoirs and river) and seasons (dry and rainy). To carry out financial comparisons of artisanal fisheries in Urubupungá Complex in the middle Paraná River (Brazil), three habitats were considered: I) Ilha Solteira and Jupiá reservoir...

Ti–6Al–4V is one of the most used commercial titanium alloys, in part due to properties that are desirable high value sectors such as aerospace industry, good strength-to-weight ratio and corrosion resistance. These importance gas turbine engines structural components, where alloys complement heavier steel or nickel alloys. It also a candidate be manufacturing prostheses, since it has biocompat...

The rapid and widespread expansion of rubber plantations in Southeast Asia necessitates a greater understanding of tree physiology and the impacts of water consumption on local hydrology. Sap flow measurements were used to study the intra- and inter-annual variations in transpiration rate (Et) in a rubber stand in the low-elevation plain of central Cambodia. Mean stand sap flux density (JS) ind...