نتایج جستجو برای: mixed oxide
تعداد نتایج: 392825 فیلتر نتایج به سال:
copper extraction from heap 3 low grade ore at sarchechmeh is limited due to its mixed composition (copper oxide and sulphide minerals). changing this heap to a bioheap could improve the copper recovery.
in the present work, zno/bi2o3, sno2/bi2o3/bi2o4 mixed oxide, bi2o3 rod-like and sno2 nanoparticle have been synthesized. the obtained samples were characterized by field emission scanning electron microscopy (fe-sem) and x-ray diffraction (xrd). the optical properties of samples were evaluated by uv-vis spectrophotometer. the photocatalytic activity of samples was evaluated by decolorization o...
the no removal over oxide sorbents (k2o/al2o3 , cao/al2o3 and bao/al2o3) at a loading of up to 25 wt.% was investigated using a synthetic diesel exhaust gas containing 1,000 ppm no, 1000 ppm iso-butane (i-c4h10), 8% o2 and n2 balance. the reactor was operated at 250 oc to 450 oc for the activity study. no was effectively stored (removal efficiencies between 30-60 %) as nitrate under experimen...
biocompatibility of portland cement modified with titanium oxide and calcium chloride in a rat model
introduction: the aim of the present study was to evaluate the biocompatibility of two modified formulations of portland cement (pc) mixed with either titanium oxide or both titanium oxide and calcium chloride. methods and materials: polyethylene tubes were filled with modified pcs or angelus mta as the control; the tubes were then implanted in 28 wistar rats subcutaneously. one tube was left e...
The catalysis science of mixed metal oxides (supported metal oxides, molecular sieves and bulk mixed metal oxides) has undergone dramatic paradigm changes over the past 25 years as new characterization techniques became available (X-ray absorption spectroscopy (EXAFS/XANES/soft XANES), Raman, solid-state NMR, HR-TEM, UV–vis DRS and LEISS) to catalysis researchers. The major advantages offered b...
Despite their potential use as pixel-switching elements in displays, the bias and light instability of mixed oxide semiconductor thin-film transistors (TFTs) still limit their application to commercial products. Lack of reproducible results due to the sensitivity of the mixed oxides to air exposure and chemical contamination during or after fabrication hinders any progress towards the achieveme...
In PZT thin film devices, with silver oxide electrodes, the diffusion of silver atoms into the PZT structure is very possible which may change the properties of the device. In the present work, this effect on PbZr1-xTixO3 with x = 0.47 has been investigated. The samples were prepared by mixed oxide method. After calcination the mixed powders, Ag2O with different weight percent were added. All t...
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