نتایج جستجو برای: concentration of cu 956 ppm
تعداد نتایج: 21186069 فیلتر نتایج به سال:
Surface impurities on spherical Au and Cu crystals grown from a drop of melt on graphite in UHV were analyzed by Auger electron spectroscopy after the metals had been cleaned by melting resp. roasting in air. Crystals of Au-Cu alloys grown by the same technique show enrichment of the less abundant component. The well known reconstructions Au(001)(5x20) and Au(l 1 l)(23x 1) could not be detected...
Geochemical characterization in stream sediments from Nyambaka locality was carried out on ten samples collected the study area watershed. The distribution of trace metals showed that some lithophiles (Be, Sc, V, Cr, Sr, Th, U), chalcophiles (Cu, Zn, Ga, As) and siderophiles (Mn, Co, Ni, Mo) have high average contents compared to their concentration upper crust. From factorial analysis componen...
Due to low availability of zinc and copper in calcareous soils and the antagonism of these nutrients with each other, the study of their effects on growth and chemical composition of rice seems to have great importance. Also, the relations among different chemical forms of Zn and Cu and plant responses are very important, which can be used in investigation of antagonisms of these nutrients as w...
The textile industry is the main source of environmental pollution in terms quality and quantity. It consumes large amounts water (200 m3/ tonne products), around 90% quantity wastewater. Improper disposal wastewater will cause serious problems due to presence heavy metals waste which adversely affect aquatic organisms. To analyze, concentration (batik) was collected from 15 small, medium, larg...
asymmetric membranes are widely used in many industrial membrane separation processes. the major advantage of membrane filtration over the conventional process is its ability to remove a wider spectrum of particles without using any chemicals. hollow fiber configuration offer many advantages over flat-sheet or tubular membranes. the spinning process of hollow fiber may look simple, yet it is te...
مقایسه کانسارCu-Ag-Au قلعه زری با دیگر کانسارهای نوع Iron Oxides Cu-Au (IOCG) و ارائه ردهبندی جدید
The Qaleh-Zari specularite- rich Cu-Au-Ag deposit is located 180 Km south of Birjand. Host rocks are mainly Tertiary andesites and andesitic basalts and some Jurassic shales and sandstones. Andesitic rocks from the western region of Qaleh-Zari were dated to 40.5±2 Ma. Four trends of faults and joints are identified in the mine area. The oldest is mineralized. Three major sub-parallel quartz ve...
in this research we have studied the effect of some transition-metals (cu, ag and au) substitutions on two-electron reduction potential of flavins by application of dft method. all geometries have been optimized at blyp level of theory and “6-31+g** + lanl2dz” mixed basis set. the frequency job at the same method and basis sets has been performed to obtain gibbs free energy of compounds. it h...
Two simple and fast methods for the extraction of the nitrite ion (NO(2)(-)) from food samples have been developed. The methods were characterized by UV-visible spectroscopic and electrochemical measurements, and their performance for NO(2)(-) extraction was compared with a standard method. The extraction methods yielded relative recoveries between 100 and 120% with good reproducibility of 3.9%...
Crude rhizome extracts and volatile oils of Curcuma aromatica were evaluated for chemical composition and anti-mosquito potential, including larvicidal, adulticidal, and repellent activities against the Aedes aegypti mosquito. Chemical identification achieved by GC/MS analysis revealed that xanthorrhizol, 1H-3a, 7-methanoazulene and curcumene at 35.08 and 13.65%, 21.81 and 30.02%, and 13.75 and...
Top left: Calculated intensity of alpha-induced γ-emission as a function of time and alpha energy for JET discharge #61346; Fokker-Planck model, τ s = 620 ms, τ blip = 100 ms Top right: Analysis of superconductors with high Cu / non-Cu ratio: Different types of NbTi strands with different Cu / non-CU ratios Bottom: Development of CO 2 emissions until 2100 under the assumption that no measures a...
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