in order to investigate the role of multi-wall carbon nanotubes (mwcnts) on fracture mechanism of epoxy nanocomposites, a series of tensile standard specimens reinforced with different carbon nanotube contents (0, 0.3, 0.6 and 1 wt%) were produced. the fracture surfaces of the produced nanocomposites were evaluated using scanning electron microscope (sem). the results show that the surface frac...

The object of research is the analytical description phenomena in near-surface layer, which are caused by interaction titanium with oxygen at high temperatures. These temperatures that exceed polymorphic transformation metal. High-temperature oxidation gives products unique performance properties. Of course, such characteristics determined, first all, state layer. Therefore, an understanding pr...

The California mussel, Mytilus californianus, adheres in the highly oxidizing intertidal zone with a fibrous holdfast called the byssus using 3, 4-dihydroxyphenyl-l-alanine (DOPA)-containing adhesive proteins. DOPA is susceptible to oxidation in seawater and, upon oxidation, loses adhesion. Successful mussel adhesion thus depends critically on controlling oxidation and reduction. To explore how...

Phosphoglycerate dehydrogenase was purified from extracts of Escherichia coli by conventional methods and the enzyme was crystallized from ammonium sulfate solution. The crystalline preparation appeared homogenous in the ultracentrifuge and upon zone electrophoresis. The reduction of hydroxypyruvate-P proceeded faster than the oxidation of phosphoglycerate (PGA) and the latter reaction was inhi...

Laboratory experiments and modeling studies were performed to investigate the redox transformations of arsenic and iron in water treatment sludge during aging, and to evaluate the impact of those transformations on the leachability of arsenic determined with the U.S. EPA toxicity characteristic leaching procedure (TCLP). When the backwash suspension samples collected from a California surface w...

Three Nb alloys, containing 1 w/oZr, 2.5 w/oZr, and IOW-2.5Zr, were internally oxidized in the range of 1555 to 1768 O C at oxygen pressures ranging from 5 x to 1 x torr. Linear kinetics were measured suggesting that oxygen arrival at the surface and not oxygen diffusion in the substrate was rate controlling. Both tetragonal and monoclinic ZrOn formed, the tetragonal form being favored by high ...