نتایج جستجو برای: gold
تعداد نتایج: 83359 فیلتر نتایج به سال:
The Chah-Bagh gold occurrence is located in Muteh mining district, in the central part of the Sanandaj-Sirjan zone. Gold mineralization occurs in ductile to ductile-brittle shear zones and is comparable with orogenic gold deposits. Silicification and sulfidization are the most important hydrothermal alteration features in the inner parts of altered shear zones and coincide most closely with the...
چکیده ندارد.
Background and purpose: Synthesis of homogeneous and equally important nanoparticles is very popular in various sciences. Preparation and use of gold nanoparticles is very important according to their applications in biotechnology. For synthesizing homogeneous gold nanoparticles many substrates and nanostructures have been used. This study aimed at synthesis of gold nanoparticles by apoferriti...
Hedging is one of the most important topics in investment field, which could be noticed from different points of view. We evaluate the role of gold relative to different indices in Tehran Security Exchange (TSE) as a representative of Iran Capital Market .In this topic gold charecterristics of “save haven” and “hedge” versus TSE are studided. Daily Price Returns of 21 TSE stock indices and dail...
several methods have been developed for gold exploration in the past, among which biological base method is known to be the most efficient with least expenses. this method can also be used for latent gold prospects exploration. in the present study, the possibility of applying bacillus cereus frequency in soil as a biological marker was investigated for the exploration of latent gold prospectin...
Background and Objectives: Gold nanoparticles have found many applications in cancer diagnosis and therapy, drug and gene delivery and DNA and protein characterizations. Fungi are extremely good candidates in the synthesis of metal nanoparticles because of their ability to secrete large amounts of enzymes. The aim of this study was biosynthesis of gold nanoparticles by a fungus. Materials and M...
The main standard method for gold karat determination is the cupellation method. However, this method is not sufficiently accurate to determine gold karat in the presence of insoluble Platinum–Group Metals (PGMs), such as Ir, Ru, and Rh. In this study, for the first time, a complementary method that can be used coupled with the reference cupellation method is presented for the high...
Two case studies (Kumtor in the Kyrgyz Republic and Pascua-Lama in Chile–Argentina) are analysed, illustrating how gold mining interferes with glaciers and how this may be affected by changing perceptions on global warming. Although global warming presents new opportunities for the mining industry, increasing the physical accessibility of resources previously covered with glaciers, it may also ...
the aim of this study is experimental assay of sensitivity and stability of a bimetallic silver/gold spr sensor chip. this chip utilizes the sensitivity of the silver and the stability of the gold. moreover, the silver layer (instead of usual cr or ti layer) was used as an adhesive intermediate layer between the gold layer and the glass substrate. the optimization of the gold/silver thickness u...
Recovery of gold and other valuable metals from electronic scrap involves a complex metallurgical flow sheet and requires state-of-the-art recovery technologies that are available in large-scale, integrated smelter and refinery operations. At the end of their use, electronic and other electrical product scrap offer an important recycling potential for the secondary supply of gold and silver...
نمودار تعداد نتایج جستجو در هر سال
با کلیک روی نمودار نتایج را به سال انتشار فیلتر کنید