Measurement of gold

Nanostructured Au-Ceria has been known as a promising catalyst for the low-temperature water-gas shisft reaction. The catalyst prepared by coprecipitation method with the gold loading various between 2 - 3 at.% with the crystallite size of 2.9 nm has been used to study some factors that effect to catalytic activity and long-term stability of this material.

5p uocvong04 24-09-2015 39 2   Download

Radiochemical Neutron Activation Analysis (RNAA) for gold determination in sulfide ores was studied. The sample was ignited in a porcelain for one hour at 600o C and dissolved then with aqua regia. The gold was absorbed on an ion exchange resin AG 1 × 8 in medium 1N HCl. The resin sample was then irradiation in Da Lat nuclear reactor with neutron flux about 2.4× 1012 n/cm2 s. The radioactivity of gold was measured by Au-198 isotope on a detector GeHP connected Multichannel analyser (MCA) and PC pentum 586.

3p uocvong04 24-09-2015 66 5   Download

Gold has always fascinated the mankind’s imagination and influenced their urge to possess the same. Gold occupies a pivotal role in the social and economic life of poor and rich alike. In Vietnam, besides the economic and strong social considerations, individuals are highly sentimental about the gold jewellery in their possession, as the gold ornaments are passed on from one generation to another. Acquisition of gold is considered auspicious and necessary for making family ornaments to get a sense of wellbeing in our country.

21p thuy_khj 13-06-2013 701 4   Download

Sentence Clustering is often used as a first step in Multi-Document Summarization (MDS) to find redundant information. All the same there is no gold standard available. This paper describes the creation of a gold standard for sentence clustering from DUC document sets. The procedure of building the gold standard and the guidelines which were given to six human judges are described. The most widely used and promising evaluation measures are presented and discussed. regenerated from all/some sentences in a cluster (Barzilay and McKeown, 2005). ...

9p hongphan_1 15-04-2013 51 3   Download

Strategies for Stem Cell Replacement Stem cell transplantation is not a new concept and it is already part of established medical practice. Hematopoietic stem cells (HSCs) (Chap. 68) are responsible for the long-term repopulation of all blood elements in bone marrow transplant recipients. HSC transplantation is now the gold standard against which other stem cell transplantation therapies will be measured. Transplantation of differentiated cells is also a clinical reality, as donated organs (e.g., liver, kidney) and tissues (i.e.

5p konheokonmummim 03-12-2010 89 10   Download

Rutherford (also Geiger-Marsden) Experiment (1911): Measured angular dependence of   particles (He ions) scattered from gold foil. The results: • Mostly scattering at small angles. But… • Occasional scatterings at large angles (even 90o)  Something massive in there ! Conclusion: Most of atomic mass is concentrated in a small region of the atom Recall some history:

35p thanhan 22-07-2009 107 15   Download