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Search Results: 1 - 10 of 255096 matches for " K.V. Lo "
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Two-Stage Dilute Acid Hydrolysis of Dairy Manure for Nutrient Release, Solids Reduction and Reducing Sugar Production  [PDF]
S. K. Yawson, P.H. Liao, K.V. Lo
Natural Resources (NR) , 2011, DOI: 10.4236/nr.2011.24028
Abstract: The microwave enhanced advanced oxidation process (MW/H2O2-AOP) aided with dilute sulfuric acid was applied in a two-stage treatment of dairy manure for nutrient release, solids reduction, and reducing sugar production. A much higher hydrogen peroxide dosage (1.2 g H2O2/g TS) was used in Stage 2 than that in Stage 1 (0.38 g H2O2/g TS). Most of the reducing sugar was produced in Stage 1, and only a small amount produced in Stage 2. The highest reducing sugar yield of 15.5% was obtained at 160℃, 0 mL H2O2/, and 20 min of heating time. With a high hydrogen peroxide dosage and a higher operating temperature of 160℃ in Stage 2, the nutrient release conversion rate was much higher in Stage 2 than Stage 1. All of total phosphorus was converted to orthophosphate, and a very high ammonia concentration was obtained in the treated solution. The results indicated that the MW/H2O2/-AOP operated under the reducing process (without hydrogen peroxide) provided the best yield of reducing sugar; however, when operated under an oxidative process (with hydrogen peroxide), it favoured nutrient release and solids disintegration. The concentration of total chemical oxidation demand (TCOD) in the treated solution decreased with an increase of temperature, hydrogen peroxide dosage and heating time. Soluble chemical oxidation demand (SCOD) concentration decreased with a very high hydrogen peroxide dosage. Volatile fatty acids (VFA) concentration decreased with an increase of hydrogen peroxide dosage. Ammonia and orthophosphate concentrations increased with an increase of temperature and hydrogen peroxide dosage.
Influence of Material Condition on the Dry Sliding Wear Behavior of Spring Steels  [PDF]
K. V. Arun, K.V. Swetha
Journal of Minerals and Materials Characterization and Engineering (JMMCE) , 2011, DOI: 10.4236/jmmce.2011.104023
Abstract: During the past two decades, considerable efforts have been made in the development of high performance spring steels to meet the needs for weight and savings in the automotive industry. During the service the suspension system will be subjected to different environmental conditions, at the same time it has to sustain a variety of loads acting on it. Among all the wear of spring steel plays a vital role. In this experimental analysis an attempt has been made to investigate the performance of spring steel (EN-47 / SUP 10) under the dry sliding condition. The specimen preparation and the experimentations have been carried out according to the ASTM G99 standards. The effects of tempering and cryogenic treatments on the performance of the spring steel have also been determined. The results have revealed that the material condition has got a significant influence on the performance of the spring steel. In order to analyze the percentage contribution of different wear parameter and the material condition, the DOE and ANOVA have been made. The results have shown that the load (49.205%) has shown the highest influence and the material condition has shown 22.56% of contribution on wear behavior.
Multitasking Algorithms for Optimization of Space Structures
K.V. Marthandan
Research Journal of Applied Sciences , 2012,
Abstract: Various multitasking approaches are investigated for optimization of large space structures. Judicious combination, macrotasking and autotasking is explored with the goal of achieves a vector zed and multitasked algorithm for optimization of large structure with maximum speedup performance. Speedup results are presented and compared for three space truss structures with 526, 1046 and 3126 members.
Urbanisation and Municipal Solid Waste Management
K.V. Marthandan
Journal of Engineering and Applied Sciences , 2012,
Abstract: Waste is an unavoidable by product of human activities. Economic development, urbanization and improving living standards in cities, have led to increase in the quantity and complexity of generated waste. Management of Municipal Solid Waste (MSW) resulting out of rapid urbanization, has become a serious concern for government departments, pollution control agencies, regulatory bodies and also public in most of the developing countries. Rapid growth of population and industrialization (www.earthscam.co.uk) degrades urban environment and places serious stress on natural resources, which undermines equitable and sustainable development. Inefficient management and disposal of solid waste is an obvious cause for degradation of environment in most cities of the developing world. Improper disposal of this waste leads to spread of communicable diseases, causes obnoxious conditions and spoils biosphere as a whole. Cleanliness is a major factor that influences development of any nation, which is otherwise hampered due to improper disposal of solid waste.
Laser Synthesis of Ag Island-Shaped Nanostructures at Air
Kozadaev K.V.
Proceedings of the International Conference Nanomaterials : Applications and Properties , 2013,
Abstract: The present work is dedicated to the development of formation method of island-shaped nanostructures from Ag. For the formation of Ag nanoparticles fluxes the method of laser synthesis at air conditions is proposed. By the deposition of Ag nanoparticles on layers, the island-shaped nanostructures of Ag can be obtained.
Cellular populations and sclerosis factors at limited scleroderma on the edema stage: immunohistochemical research
Romanenko K.V.
Морфолог?я , 2009,
Abstract: The purpose of the current study was to reveal immunohistochemical features of derma and epidermis in the edema stage of localized scleroderma using markers: CD3, CD8, CD20, CD79α, CD68, CD1α, CD34, CD105, SMA, vimentin, eNOS, Ki67, collagen IV, bcl2, caspase 3. T-lymphocytes (20-40%), among last supressors, and the immature forms of B-lymphocytes (20-40%) prevail in perivascular infiltrates and mononuclear accumulations around the appendages of skin during this stage. There are macrophages in infiltrates (to 30%). Activity of eNOS in endothelium of vessels is increased. The CD105 synthesis was observed in dermal dendrocytes, immune cells of infiltrates and in single macrophages. The latters give the most number of CD105+ among immune cells. Amount of CD34+ dendrocytes was reduced, in the same time Lanhgergan’s cells (CD1α+), vimentin+ and SMA+ of dendrytic cells was multiplied. The change of cellular composition was more substantial in areas round the appendages. The active immune inflammation leads to the local promoted proliferation and apoptotic activity, and similarly to activation of the ant apoptotic programs. Thus, the edema stage of localized scleroderma is related to the most active changes both from the side of the immune system and by local alterations of skin tissues.
mmunohistochemical characteristics of cellular populations and factors of sclerosis development on the late stages of localized scleroderma
Romanenko K.V.
Морфолог?я , 2010,
Abstract: The purpose of the current study was to reveal immunohistochemical features of derma and epidermis in the late stage of localized scleroderma using markers: CD3, CD8, CD20, CD79α, CD68, CD1α, CD34, CD105, SMA, vimentin, eNOS, Ki67, collagen IV, bcl2, caspase 3. It was determined that as far as inflammatory processes weakens there are the followings changes in mononuclear infiltrates: partial substitution of T-limphocytes on B, predominance of mature B-lymphocyles, increase in T-supressors amount. The eNOS activity decreases constantly. The CD105 marker prevails in endothelium. CD34+ dendrocytes in papillary and superficial areas of the dermal reticular layer reduce in number constantly that results in forming of gradient. CD1α+, vimentin+ and SMA+ of dendritic cells are maximal in number on the stage of edema and induration and break down on the stage of sclerosis. The change of cellular composition was more substantial round the appendages of skin. Till the sclerosis stage Ki67+ cells amount decreases substantially, as well as caspase 3+ and bcl2+ cells, both among immune and dendritic cells.
Cast iron component failure: A metallurgical investigation
K.V. Sudhakar
Archives of Foundry Engineering , 2012,
Abstract: A fractured nutcracker was examined for determining the root cause/s for premature fracture/failure. This is one of the common tools usedtypically for cracking hard nuts. In this study, metallurgical failure analysis techniques namely, visual inspection, optical microscopy, SEM, and hardness tests were used in investigating the broken product. From the metallurgical analysis, it was determined that the combined effect of low carbon equivalent and presence of inclusions contributed to the sudden fracture of the nut cracking tool.
Kiselev K.V.
Journal of Stress Physiology & Biochemistry , 2012,
Abstract: At the present time, it is well documented that plant tissue culture induces a number of mutations and chromosome rearrangements termed “somaclonal variations”. However, little is known about the nature and the molecular mechanisms of the tissue culture-induced mutagenesis and the effects of long-term subculturing on the rate and specific features of the mutagenesis. The aim of the present study was to investigate and compare DNA mutagenesis in different genes of Panax ginseng callus cultures of different age. It has previously been shown that the nucleotide sequences of the Agrobacterium rhizogenes rolC locus and the selective marker nptII developed mutations during long-term cultivation of transgenic cell cultures of P. ginseng. In the present work, we analyzed nucleotide sequences of selected plant gene families in a 2-year-old and 20-year-old P. ginseng 1c cell culture and in leaves of cultivated P. ginseng plants. We analysed sequence variability between the Actin genes, which are a family of house-keeping genes; the phenylalanine ammonia-lyase (PAL) and dammarenediol synthase (DDS) genes, which actively participate in the biosynthesis of ginsenosides; and the somatic embryogenesis receptor kinase (SERK) genes, which control plant development. The frequency of point mutations in the Actin, PAL, DDS, and SERK genes in the 2-year-old callus culture was markedly higher than that in cultivated plants but lower than that in the 20-year-old callus culture of P. ginseng. Most of the mutations in the 2- and 20-year-old P. ginseng calli were A G and T C transitions. The number of nonsynonymous mutations was higher in the 2- and 20-year-old callus cultures than the number of nonsynonymous mutations in the cultivated plants of P. ginseng. Interestingly, the total number of N→G or N→C substitutions in the analyzed genes was 1.6 times higher than the total number of N→A or N→T substitutions. Using methylation-sensitive DNA fragmentation assay, we showed that the level of methylcytosine was higher in the DNA of the 20-year-old P. ginseng calli that than that in the DNA of the 2-year-old calli. Taken together, the data obtained demonstrate that both 2- and 20-year-old subculturing of P. ginseng tissues in vitro increased the number of point mutations, the diversity of mutation types, and the number of potential DNA methylation sites in the analyzed gene regions. It is possible that these mutation processes is the main reason underlying the decline in the vigor and regenerability of P. ginseng tissue culture over time.
Culture of estuarine benthic and nectonic first trophic level feeders
K.V Singarajah
Brazilian Journal of Oceanography , 1980, DOI: 10.1590/s1679-87591980000200072
Abstract: The paper deals with some base trophic factors in relation to two herbivores, namely oysters and mullets, which derive their energy directly from the first trophic level of an estuarine ecosystem. The analysis of the gut contents of both organisms has shown that they feed mostly on micro-organisms, especially planktonic and benthic diatoms, and a significant percentage of detritus materials, including inorganic particles, is always present. Their dietary components are very much related to seasonal abundance of food production of the estuary. Current yields of oysters and mullets are far too low and food source is not a limiting factor for their production on large scale. Tidal flows, particularly in relation to salinity, have profound effect on culture grounds. Mortality is largely due to predation.
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