نتایج جستجو برای: cr ores
تعداد نتایج: 48215 فیلتر نتایج به سال:
Although bioleaching was used unknowingly by the ancients to extract metals (principally copper) from ores, the development of modern commercial bioleaching processes is relatively new. It began in the late 1940s, with the discovery of the role of bacteria in the formation of acid mine drainage. From there, research and development activities in the field flourished, and the earliest commercial...
The paper presents the calibration of Fuji BAS-TR image plate (IP) response to high energy carbon ions of different charge states by employing an intense laser-driven ion source, which allowed access to carbon energies up to 270 MeV. The calibration method consists of employing a Thomson parabola spectrometer to separate and spectrally resolve different ion species, and a slotted CR-39 solid st...
A program code to simulate neutron interactions with a CR-39 detector and calculate parameters describing the induced etched proton tracks in the CR-39 material was previously developed(( 1)). This code was used to understand the mechanisms involved during interactions with neutrons in the CR-39 material and the influence of the etching process, enabling an improvement in the efficiency of the ...
Colorless sulfur oxidizing bacteria comprise an important part of sulfur cycle in nature and hold significant value for biotechnological applications such as, increasing soil fertility, reduction of environmental pollution by biologically oxidizing toxic sulfides present in waste waters from different industries and sewage, leaching of economically important metals from poor ores. Present artic...
The type strain (ATCC 23270) and two other strains of Thiobacillus ferrooxidans were able to grow by hydrogen oxidation, a feature not recognized before. When cultivated on H2, a hydrogenase was induced and the strains were less extremely acidophilic than during growth on sulfidic ores. Cells of T. ferrooxidans grown on H2 and on ferrous iron showed 100% DNA homology. Hydrogen oxidation was not...
in this paper we consider contact cr-warped product submanifolds of the type $m = n_ttimes_f n_perp$, of a nearly kenmotsu generalized sasakian space form $bar m(f_1, f_2, f_3)$ and by use of hopf's lemma we show that $m$ is simply contact cr-product under certain condition. finally, we establish a sharp inequality for squared norm of the second fundamental form and equality case i...
DOI: 10.17014/ijog.8.1.73-99 Laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) and electron microprobe analysis (EMPA) techniques were used to determine the mineralogy chemistry of dominant sulphide associated gold deposits at Fairview Gold Mine Barberton Greenstone Belt (BGB). The rocks ore mineral associations indicate mesothermal (orogenic) conditions for deposit. whole...
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