Graphite tailings were used as the raw materials for preparation of foamed ceramics via a high-temperature self-foaming method. The residual carbon in acted foaming agent and no additional agents required. reacted with Fe2O3 produced gas that was wrapped by liquid phase to form porous structure. effects sintering temperature, holding time, content, flux on bulk density, water absorption, mean p...

Nanostructured Iron Oxide with different morphologies of rod-like and granular have been suc-cessfully prepared via a solid-state reaction in the presence of NaCl, NaBr, NaI and NaN3, respectively. The added salts not only prevent a drastic increase in the size of the products but also provide suitable conditions for the oriented growth of primary nanoparticles. The formation mechanisms of thes...

in this study, the microstructure and properties of foam glass obtained as a result of the interaction of the waste glass with sic as the foaming agent and fe2o3 as the oxidizing agent have been investigated using scanning electron microscopy (sem), as well as three-point bending and pycnometery tests. first, the temperature and optimized amount of sic for making foam glass was determined. the ...

fischer-tropsch catalysts with high activity and selectivity for olefins were produced using mordenite type sio2/al2o3= 12, 20, 28, 62 zeolite supported iron carbonyl compounds and were characterized by x-ray powder diffraction. the adsorptionof volatile fe(co)5 on the support surface was carried out under vacuum at room temperature. reduction les were monitored by vibrating sample magnetometer...

Environmental temperature fluctuations cause phase changes of the light propagating through optical fibers due to their thermal sensitivity. This limits stability fiber delay-line interferometers. Here, we present a thermally-insensitive Mach-Zehnder interferometer. It consists hollow core (HCF), which has low sensitivity coefficient, in one branch and standard single-mode with coefficient abou...

this study compared diet and regular coca-cola on enamel erosion in cold and room temperatures.seventy five enamel specimens were prepared and divided into 5 equal groups (n=15) as follows: group 1: regular beverage at room temperature, group 2: regular beverage at refri-gerator temperature, group 3: diet beverage at room and group 4: diet beverage at refrige-rator temperature. the specimens we...

in this research, the survival of probiotic microorganisms in yogurts stored at room temperature (cold chain interruption conditions) was studied. milk inoculated with yogurt bacteria (mixed culture of streptococcus thermophilus and lactobacillus delbrueckii ssp. bulgaricus) and a single probiotic culture (l. acidophilus la-5 or bifidobacterium lactis bb-12 or l. rhamnosus hn001 or l. paracasei...

 A series of symmetric and asymmetric binuclear α-diimine nickel(II) complexes toward ethylene polymerization were successfully synthesized and characterized by 1HNMR. All the catalysts were typically activated with MAO and displayed good activity at room temperature under 1atm ethylene pressure. The symmetric catalyst containing isopropyl on l...

The nature and properties of radicals produced by the action of electron and ^-radiation on adamantane have been investigated. Radicals produced by irradiation at 77 °K are stable to around room temperature, while irradiation at the latter temperature yields well resolved spectra of species stable to about 130 °C. The significance of the latter, assigned as the 1-adamantyl radical, in the forma...