Leaching experiment was conducted to understand the mechanism of arsenic release from soil in the natural field conditions. Two types of column were run, one with de-ionized water (DW) and another with synthetic Bangladesh groundwater (GW) as influent which simulated rainfall and groundwater conditions, respectively. As the primary mechanism for the arsenic release from soil it was identified t...

(1) Phosphorus (P) removal has proven difficult in decentralized wastewater treatment systems, and external filters installed with a highly P sorbent material have been proposed to improve the removal. In particular, calcium (Ca) rich materials shown promising results. (2) Eight (five calcareous materials, one quartz sand, two Sol–Gel coated materials) were tested columns fed P-spiked tap water...

10 We present a column generation procedure for the side constrained traffic equilibrium problem. A dual 11 stabilization scheme is introduced to improve the computational performance. Computational experiments 12 for the case of linear side constraints are presented. The test problems are well known traffic equilibrium 13 instances where side constraints of link flow capacity type and general ...

A series of balanced bipartite row-column designs (BBPRC-designs) into sets of treatments with v1=4t+3 (test treatments) v2=2t+2 (control treatments) with varying replication has been obtained by supplementing a set of v2=2t+2 treatments in blank positions of non-orthogonal RC design of Agrawal (1966). Such designs find applications in agricultural and industrial experimentation where the inves...

Compression is one of the most important techniques in data management, which is usually used to improve the query efficiency in database. However, there are some restrictions on existing compression algorithms that have been applied to numeric data in column-oriented databases. First, a compression algorithm is suitable only for columns with certain data distributions not for all kinds of data...

Comprehensive two-dimensional gas chromatography (GC x GC) is shown to provide information on dynamic molecular behaviour (interconversion), with the interconversion process occurring on both columns in the coupled-column experiment. The experiment requires suitable adjustment of both experimental conditions and relative dimensions of each of the columns. In this case, a longer column than norm...