tertiary andesitic basalts of the sirjan area, urmieh-dokhtar magmatic arc, iran, contain plagioclase phenocrysts enclosed in a matrix of amphibole, clinopyroxene and rare olivine crystals. textural and compositional evidence suggests two significantly different types of plagioclase phenocrysts occur in the andesitic basalts. the most common type of plagioclase phenocrysts have zoning patterns ...

clinopyroxene phenocrysts and microphenocrysts in potassic and sodic eosen alkaline volcanic rocks from the northern lahrud (nw iran) record various stages in the crystallization and evolution history of the alkaline melt as well as its origin. the rock series hosting the clinopyroxene phenocrysts is phonolitic tephrite and tephritic phonolite composition. theses rocks generally show porphyriti...

Anthracene fibers are grown inside a microstructured quartz matrix to form a multicore optical fiber for X-ray detection. A modified fiber growth method for single crystal anthracene from the melt via the Bridgman-Stockbarger technique is presented. The anthracene fiber is characterized by using spectrophotometry, Raman spectroscopy, and X-ray diffraction. These results show the anthracene grow...

Sm(CobalFe0.1CuxZr0.03)7 (x = 0.0–0.25) ribbons have been prepared by melt spinning. The effects of annealing parameters on coercivity and its temperature dependence have been studied systematically. It is found that the melt-spinning technique remarkably improves the magnetic properties and simplifies the annealing process. The high-performance precipitation-hardened magnets can be obtained by...

Abst rac t -This study investigates the effects of variations in the fugacities of oxygen and sulfur on the partitioning of first series transition metals (V, Cr, Mn, Fe, Co, Ni, and Cu) and W among coexisting sulfide melt, silicate melt, and olivine. Experiments were performed at 1 atm pressure, 1350°C, with the fugacities of oxygen and sulfur controlled by mixing CO2, CO, and SO2 gases. Start...

The upper mantle is widely considered to be heterogeneous, possibly comprising a “marble-cake” mixture of heterogeneous domains in a relatively well-mixed matrix. The extent to which such domains are capable of producing and expelling melts with characteristic geochemical signatures upon partial melting, rather than equilibrating diffusively with surrounding peridotite, is a critical question f...

Laser welding of copper to aluminum is challenging due the formation complex intermetallic phases. More Al (~18.5 at. %) can be dissolved in Cu, contrast Cu (~2.5 Al. Therefore, from side, large melting achieved. However optimum and must melted for a strong joint. Finding right amount difficult time consuming by tradition analysis technique like inspection weld cross-sections. Considering speed...

Modelling and simulation of injection moulding process is an important technique that could shorten production cycle time with improved productivity for defect-free parts. This technique is more suitable for micro-injection moulding (μIM) process as likely defects during production can be predicted. Therefore, this study aims to investigate the effect of runner dimensions on quality of moulded ...

The ability of agar with different purification degrees to produce packaging films has been evaluated and the stability obtained materials after prolonged storage investigated. less purified resulted in higher water vapor permeability lower mechanical performance than pure commercial agar. However, film required addition a plasticizer that could be manipulated. It also observed at 53 % RH resul...

ÐA novel mesoscopic modeling technique has been developed to simulate the unsteady growth of multiple equiaxed dendritic grains into a supercooled melt of a pure substance. In the model, the numerical calculation of the temperature ®eld in the supercooled melt between the grains is coupled with a stagnant®lm model for dendrite tip growth, such that without resolving individual dendrite arms the...