14 research outputs found
The completion of optimal -packings
A 3- packing design consists of an -element set and a
collection of -element subsets of , called {\it blocks}, such that every
-element subset of is contained in at most one block. The packing number
of quadruples denotes the number of blocks in a maximum
- packing design, which is also the maximum number of
codewords in a code of length , constant weight , and minimum Hamming
distance 4. In this paper the undecided 21 packing numbers are shown
to be equal to Johnson bound
where ,
is odd,
The Inadvertent Activation of Silicate Minerals Flotation and Their Depression in Molybdenite Beneficiation
The Wushan Operation has been studied as a case study, particularly relevant to the copper-molybdenum separation circuit, in which efforts have been made to improve the quality of the molybdenum concentrate through diagnostic analysis. A key finding has been the appearance of coarser silicate minerals in the molybdenum concentrate due to their inadvertent activation in flotation. The suitable silicate minerals flotation conditions occurs, most likely, due to upstream bulk flotation regarding the usage of novel collectors and metal cations bearing process water. The flotation of silicate minerals can be diminished by the implementation of water glass and regrinding. The mechanisms underlying flotation behaviors have been revealed by using advanced in-situ surface analysis and particle size analysis techniques
The Inadvertent Activation of Silicate Minerals Flotation and Their Depression in Molybdenite Beneficiation
The Wushan Operation has been studied as a case study, particularly relevant to the copper-molybdenum separation circuit, in which efforts have been made to improve the quality of the molybdenum concentrate through diagnostic analysis. A key finding has been the appearance of coarser silicate minerals in the molybdenum concentrate due to their inadvertent activation in flotation. The suitable silicate minerals flotation conditions occurs, most likely, due to upstream bulk flotation regarding the usage of novel collectors and metal cations bearing process water. The flotation of silicate minerals can be diminished by the implementation of water glass and regrinding. The mechanisms underlying flotation behaviors have been revealed by using advanced in-situ surface analysis and particle size analysis techniques
Epidemiology and Molecular Characterizations of Azole Resistance in Clinical and Environmental Aspergillus fumigatus Isolates from China.
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