In this work, we present functionalization of AISI 316L surfaces by nanosecond Nd:YAG laser texturing and adsorption of superhydrophobic fluoroalkylsilane functionalized nano SiO2 particles. Surface modification by tuning the distance between laser-produced micro(μ)-channels lead to different surface roughness. After nanosilica coatings the superhydrophilic laser-textured surfaces are turned into superhydrophobic surfaces with the same μ-roughness. The higher μ-channels density leads to more hydrophobic surfaces after coating. This enable a study of combined effect of surface wettability and morphology on friction coefficient and wear resistance. The experiments were performed in air and water environment. In case of dry friction, increased μ-roughness lead to higher friction coefficient and the water-repellency modification by nanosilica particles has no influence on tribological behavior. On the contrary, in water environment the wettability presents important contribution to the properties of contact surfaces - hydrophobic surfaces express lower friction coefficient, especially at higher densities of μ-channels. The EDS analysis of worn and unworn surfaces is performed indicating the difference in Si wt% in air and water environment connected to the difference in coefficient of friction.
ESC 514 Water Quality Management (3+0+0) 3 ECTS 6
(Su Kalitesi Yönetimi)
Sources and uses of water; the hydrological cycle; physical, chemical and biological characteristics and methods of analysis. Water quality standards and global perspectives. Stoichiometry, reaction kinetics and material balances; reactor models in natural systems. Modeling of water quality by the "contaminant movement process" approach. Water quality in rivers, estuaries, lakes and reservoir systems. Introduction to water and wastewater treatment.
Physiochemical and bacteriological analyses of ..
(1976) A study to determine the comparability of chemical analyses for drinking-water quality within European communities, Luxembourg, Commission of European Communities, 97 pp (EUR 5542e).
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The present study is made to understand the impact of seasonal variation on various metal concentrations and on the diversity of bacteria and fungi in the coastal zone of Chennai, India.
Surface water, bottom water and surface sediment sample were collected from 26 station along 5 traverses, viz. ET, FHT, CHT, CRT and ART in Bay of Bengal off Chennai, India during cruise programme by CRV Sagar Purvi and Sagar Paschimi, NIOT, MOES, India during PRM, MON and POM seasons of three consecutive year of 2006-07, 2007-08 and their physicochemical parameters were all recorded.
Physico chemical characteristics, major ions and heavy metal ions in the water and sediments were analysed and subjected to statistical analysis such as correlation matrix, factor analysis, enrichment factor, contamination factor and geoaccumulation intex were also studied.
The MALDI-TOF MS PMF spectrum of the purified cupric reductase exhibited several short peptides and a few of the dominant and completely ionized peptides were selected for the PMF analysis for the identification of sequences present in the selected peptides. The data revealed that the amino acid sequences of two peptides are highly homologous to the enzyme of NADH quinine oxidoreductase which was proved to reduce copper(II) in the microbial system and thus the purified enzyme was confirmed to be of cupric reductase type.
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PR: Consent. Flow of groundwater through soils and its application to the design of highways and dams and to construction operations. Emphasis is placed on both the analytical and classical flow net techniques for solving seepage problems. (3 hr. lec.).