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Sailesh Sudhakarrao Lahore,Bhim Charan Meikap,Sudipto Chakraborty 한국화학공학회 2012 Korean Journal of Chemical Engineering Vol.29 No.6
Systems generating uniform small bubbles are used in many mineral processing and chemical operations. We investigated the generation of smaller bubbles by using a two fluid jet system. Gas holdup results are reported in terms of the effect of superficial gas and liquid velocities in relation to the pressure in a bubble column with a water jet sparger. Experiments were conducted with hydrostatic head of 80 cm, 100 cm, and 120 cm in the bubble column. The gas velocity varied from 0.122 to 1.22 cm/s, and water flow rate from 33.3 to 333 cm3/s. Experiments were conducted at pressures of 2 atms., 3 atms. 4 atms. and 5 atms., and bubble sizes were measured by a digital camera (bubble compared to a reference wire inside the bubble column). Results show that the gas holdup increases with the pressure and superficial gas velocities; and at pressures of 2, 3, 4 and 5 atms., the gas holdup increases by 8.75%, 9.166%, 10%and 10%, respectively. The maximum gas holdup of 16.4% was observed at a liquid level of 80 cm and pressure of 4 atms. Optimum conditions for generating smaller bubbles with larger gas holdup are increased liquid flow rate, low liquid level, and high gas pressure. Experimental results also indicate that the column operates in both the homogeneous and heterogeneous regimes of gas-liquid flow.
Geospatial modeling of solar radiation to explore solar energy potential in Papua New Guinea
Sailesh Samanta,Dilip Kumar Pal,Sammy Samun Aiau,Babita Palsamanta 대한공간정보학회 2016 Spatial Information Research Vol.24 No.5
Climatology and meteorology are essentially driven by the incoming solar radiation and the latter’s latitudinal distribution. The total amount of incoming solar radiation, duration or day-length and the seasonal distribution of radiation have also the leading implication in researches in agricultural sciences. With the reality of climate change looming large, with its plausible para- phernalia on the humankind, it is obvious that the rising demand for clean energy sources will swing the needle of research towards ‘the optimum harnessing of solar energy’ regime. In a specified latitudinal expanse, topography is a major factor that determines the spatial
Numerical and experimental study of the leakage flow in guide vanes with different hydrofoils
Sailesh Chitrakar,Biraj Singh Thapa,Ole Gunnar Dahlhaug,Hari Prasad Neopane 한국CDE학회 2017 Journal of computational design and engineering Vol.4 No.3
Clearance gaps between guide vanes and cover plates of Francis turbines tend to increase in size due to simultaneous effect of secondary flow and erosion in sediment affected hydropower plants. The pressure difference between the two sides of the guide vane induces leakage flow through the gap. This flow enters into the suction side with high acceleration, disturbing the primary flow and causing more erosion and losses in downstream turbine components. A cascade rig containing a single guide vane passage has been built to study the effect of the clearance gap using pressure sensors and PIV (Particle Image Velocimetry) technique. This study focuses on developing a numerical model of the test rig, validating the results with experiments and investigating the behavior of leakage flow numerically. It was observed from both CFD and experiment that the leakage flow forms a passage vortex, which shifts away from the wall while travelling downstream. The streamlines contributing to the formation of this vortex have been discussed. Furthermore, the reference guide vane with symmetrical hydrofoil has been compared with four cambered profiles, in terms of the guide vane loading and the consequent effect on the leakage flow. A dimensionless term called Leakage Flow Factor (Lff) has been introduced to compare the performances of hydrofoils. It is shown that the leakage flow and its effect on increasing losses and erosion can be minimized by changing the pressure distribution over the guide vane.
Generation of sugar modified-doxorubicin from engineered strain of Streptomyces peucetius
Sailesh Malla,Kwangkyoung Liou,Kyung Sohng 한국당과학회 2008 한국당과학회 학술대회 Vol.2008 No.1
Combinatorial biosynthesis is an alternative way for accessing naturally unavailable natural products or improving activity of already existing biomolecules by their modification. Biosynthesis of different deoxy-aminosugar and its attachment to the same or different anthracyclinone aglycones in vivo would lead to the formation of novel anthracycline compounds. Unlike doxorubicin, anthracyclines with N-alkylated sugar moieties were weakly mutagenic or not mutagenic at all in both bacterial and mammalian cells. Disruption of glycosyltransferase gene, dnrS, involved in the biosynthesis of the doxorubicin from Streptomyces peucetius ATCC 27952 led to accumulation of a non-glycosylated intermediate ε-rhodomycinone. Complementation experiment was carried out to introduce L-rhodosamine sugar for the production of rhodosaminyl-doxorubicin. Chromosomal integration of desVI encoding N,N-dimethyltransferase from Streptomyces venezuelae and aknS encoding glycosyltransferase along with its auxiliary gene aknT from Streptomyces galilaeus in the dnrS disruptant of S. peucetius led to formation of rhodosaminyl-doxorubicin.
Sailesh Palikhe,김승현,Le Duy Pham,예영민,박해심 대한천식알레르기학회 2015 Allergy, Asthma & Immunology Research Vol.7 No.3
Protein tyrosine phosphatase-22 (PTPN22) gene encodes lymphoid-specific tyrosine phosphatase (Lyp), an inhibitor of T cell activation. A polymorphism of the PTPN22 gene has been found to be associated with chronic urticaria (CU). We investigated the associations between PTPN22 gene polymorphisms and CU characteristics, including serum specific IgE antibodies response to toxic shock syndrome toxin-1 (TSST-1) and staphylococcal enterotoxin A (SEA). CU patients (n=409) and normal healthy controls (n=388) were enrolled in the present study. Serum specific IgE to TSST-1 and SEA were measured by ImmunoCAP®. Five PTPN22 single nucleotide polymorphisms, -1123G>C, 1858C>T, 13145A>G, 14943C>T, and 20628A>G, were genotyped. There were no significant differences in genotype or haplotype frequencies of these polymorphisms between the 2 groups. CU patients carrying the GG genotype at 20628A>G (P=0.035) or haplotype 3 [GGG] (P=0.047) had a significantly higher prevalence of serum specific IgE to TSST-1 compared to non-carriers. Similarly, CT/TT genotype at 14943C>T had a significantly higher prevalence of serum specific IgE to SEA (P=0.045). The findings suggest that the PTPN22 gene polymorphisms at 20628A>G and 14943C>T may enhance serum specific IgE responses to TSST-1 and SEA, which may contribute to CU pathogenesis.