The condensation heat transfer characteristics and corrosion resistance of copper, Ni-P-Cu, polytetrafluoroethylene (PTFE), Ni-P, Ni coated tube surfaces were investigated. results indicate that coefficient PTFE, tubes grows by 36.8%, 29.3%, 19.6%, 7.5% than copper tubes, respectively. phase structure Ni, PTFE is mixed crystal structure(nanocrystals-based), (amorphous-based), amorphous structur...

The University of Texas at Austin Center for · Electromechanics (UT-CEM) is a research center which specializes in pulse power technology. DoD's mission for high performance power sources has lead UT-CEM to incorporate advanced composite materials into compulsator designs. However, to achieve these high performance levels, improvements are needed in the thermal and structural properties for arm...

Bio-oil is a blackish liquid fuel derived from biomass such as corn cobs, rice husks and other cocoa shells. The organic acid content in bio-oil gives acidic properties. can be obtained the pyrolysis combustion process, using tube. number of tubes used affect yield characteristics bio-oil. purpose this study was to determine produced by varying process. Such time, amount bio-oil, temperature Th...

adequate bond strength between glass ionomer cements and composite resin is necessary for the success of the sandwich technique.this study assessed the micro-shear bond strength of composite resin to glass-ionomer cements (gic) using self-etch adhesives with different ph values.one hundred specimens (6×4×2 mm) were made using fuji ii and fuji ii lc gics and treated with different adhesives as f...

The problem of bounding the total creep (or total stress relaxation) of a composite made of two linear viscoelastic materials and subjected to a constant hydrostatic or antiplane loading is considered. It is done by coupling the immediate and the relaxed responses of the composite, which are pure elastic. The coupled bounds provide the possible range of the total deformation at infinite time as...

In a two-dimensional electron gas under a strong magnetic field, correlations generate emergent excitations distinct from electrons. It has been predicted that "composite fermions"--bound states of an electron with two magnetic flux quanta--can experience zero net magnetic field and form a Fermi sea. Using infinite-cylinder density matrix renormalization group numerical simulations, we verify t...

The purpose of this study was to determine the impact of different enamel preparation procedures and compare light cure composite (LCC) and resin-modified glass ionomer (RMGI) on the bond strength of orthodontic metal tubes rebonded to the enamel. Twenty human molars were divided into two groups (n = 10). Tubes were bonded using LCC (Transbond XT) in group 1 and RMGI (Fuji Ortho LC) in group 2....

This experimental investigation is to study the effects of replacement of cement (by weight) with five percentage of fly ash and the effects of addition of steel fiber composite. A control mixture of proportions 1:1:49:1.79 with w/c of 0.45 was designed. Cement was replaced with five percentages (10%, 15%, 20%, 25% & 30%) of Class C fly ash. Four percentages of steel fibers (0.15%, 0.30%, 0.45%...

the free vibration of the lattice cylindrical composite shell reinforced with carbon nano-tubes (cnts) was studied in this study. the theoretical formulations are based on the first-order shear deformation theory (fsdt) and then by enforcing the galerkin method, natural frequencies are obtained. in order to estimate the material properties of the reinforced polymer with nano-tubes, the modified...