objective: the appropriate choice of a contraceptive method has been a major issue in reproductive health research. cu t intrauterine device (cu t iud) has been introduced as one of the most effective contraceptive methods in the world, however, the relationship between prior use of cu t iud and secondary infertility has not been evaluated in iran. to examine the association of cu t-380a iud an...

Spark plasma sintering (SPS) is a sintering process that is capable of sintering hard worked powders in short times. This technique was used to fabricate bulk Cu and Cu-SiC nanocomposites. Pure Cu and mixed powders of Cu including 4 vol% of SiC nanoparticles were mechanically alloyed for 25 h and sintered at 750˚C under vacuum condition by SPS method. Microstructures of the materials were chara...

We present the mid-rapidity (D +D)/2 yield measured in √ sNN = 200 GeV Cu+Cu collisions at RHIC via direct reconstruction through the Kπ decay channel. A charm cross-section is reported and compared to theoretical predictions and to previous RHIC experimental results.

although cu and fe are immiscible under equilibrium conditions, they can form supersaturated solid solutions by mechanical alloying. in this paper, nano-structured of the metastable cu-fe phase containing 10, 15, 20 and 25% wt fe were synthesized by intensive ball milling for 15h, in order to achieve a solid solution of fe in cu. the phase composition, dissolution of the fe atoms into the cu ma...

First-principle calculations were carried out to investigate the adsorption of CO over Cun nanoclusters. The structural, spectroscopic and electronic properties like optimized geometries, HOMO (highest occupied molecular orbital) and LUMO (lowest unoccupied molecular orbital) energy levels, binding energy, adsorption energy, vibrational frequency and density of states (DOSs) of the p...

copper sulphide (cu 2 s) thin films at different thicknesses and annealing temperatures were deposited onto glass substrate by vacuum evaporation method. xrd study reveals the phase transformation of cu     2 s film at higher thickness. optical and resistivity study show the phase transformation of the film from cu     2 s to cus when they are annealed at higher temperature. sem st...

This study was undertaken to investigate the effects of Cu and solution heat treatment on the microstructure and hardness of cast Al-Al4Sr metal matrix composite. Different amounts of Cu (0.3, 0.5, 1, 3 and 5 wt.%) were added to the composite. Specimens were heat treated at 500 °C for 4 hours followed by water quenching. Microstructural studies were assessed by the use of optical microscope, sc...