http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
On the bounds for Wave Stability of Stratified Shear Flows
S. Lavanya,V. Ganesh,G. Venkata Ramana Reddy 한국전산응용수학회 2024 Journal of applied mathematics & informatics Vol.42 No.1
We consider incompressible, inviscid, stratified shear flows in $\beta $ plane. First, we obtained an unbounded instability region intersect with semi-ellipse region. Second, we obtained a bounded instability regions depending on Coriolis, stratification parameters and basic velocity profile. Third, we obtained a criterion for wave stability. This has been illustrated with standard examples. Also, we obtained upper bound for growth rate.
Study on polyester resin concrete for applications in chemical & power plant industry
S. Lavanya Prabha,M. Surendar,G. Prabha,A. Mohan 한양대학교 청정에너지연구소 2023 Journal of Ceramic Processing Research Vol.24 No.5
Polyester polymer resin concrete is a type of concrete that incorporates polyester polymer resins as a binder instead oftraditional cement. In this study, concrete was made using three resins: vinyl ester resin, superior vinyl ester resin, andbisphenolresin. The ingredients of polyester polymer resin concrete are three types of polyester resin, 1-2% of Methyl ethylketone peroxide (MEKP) as the catalyst, Cobalt Octoate as the Accelerator and N, N-dimethylaniline as the promoter of 1%is used to make the binding resin. Along with binding resin calcium carbonate as filler and fine aggregate (normal riversand)passing through 2.36 mm sieve and retained on 600-micron sieve and course aggregate of size 6mm were used to make theconcrete. 36 trail batches were carried out for preliminary investigation targeting a compressive strength of 70 MPa. Theshortlisted batches were taken for detailed investigation on mechanical and durability properties. The stress strain behaviourisstudied and dynamic modulus,poisons ratio is calculated with various correlative equations for mechanical properties. Thedurability properties of the resin concrete were assessed as per ACI 515.2R-13 [1966] for the acid and base solutions. Byimmersing the samples in three diluted acids and two alkaline media, such as 10% sulphuric acid, 10% nitric acid, 10%hydrochloric acid, 10% sodium sulphate, and 10% magnesium sulphate, the durability property is assessed. Variations incompressive strength, mass, and the look of the submerged samples, among other variables, have been studied and it foundthat the Vinyl ester resin concrete possesses a higher acid resistance property.
On homogeneous shear flows with bottom cross section
S. Lavanya,V. Ganesh,G. Venkata Ramana Reddy 한국전산응용수학회 2023 Journal of applied mathematics & informatics Vol.41 No.5
We consider inviscid, incompressible homogeneous shear flows of variable cross section known as extended Rayleigh problem. For this extended Rayleigh problem, we derived instability region which intersect with semi-circle instability region under some condition. Also we derived condition for stability , upper bound for amplification factor and growth rate of an unstable mode.
BOUNDS ON THE GROWTH RATE FOR THE KUO PROBLEM
S. LAVANYA,V. GANESH,G. VENKATA RAMANA REDDY The Korean Society for Computational and Applied M 2023 Journal of applied mathematics & informatics Vol.41 No.2
We consider Kuo problem of hydrodynamic stability which deals with incompressible, inviscid, parallel shear flows in the 𝛽-plane. For this problem, we derived instability region without any approximations and which intersects with Howard semi-circle region under certain condition. Also, we derived upper bound for growth rate and amplification factor of an unstable mode and proved Howard's conjecture.
( K. Lavanya Latha ),( T. V. S. S. Rao ),( J. V. Krishna Rao ),( S. Jayaraj ),( N. Sivarami Reddy ),( S. Sankar Naik ) 한국잠사학회 2008 International Journal of Industrial Entomology Vol.17 No.2
A field study on self trap cropping system in controlling tukra mealy bug Maconellicoccus hirsutus Green) incidence on mulberry (Morus spp.; V-1 variety; 3`x3` spacing) gardens was undertaken in selected sericulture farmers` mulberry gardens of Pydeti village (Parigi Mandal, Anantapur District, Andhra Pradesh, India). The study was conducted for three years (2004, 2005 and 2006). Four treatments (T0; control/no treatment, T1; self trap cropping rows with 10 row interval, T2; self trap cropping rows with 10 row interval and treating these rows only with 0.5% neem oil emulsion and T3; self trap cropping rows with 10 rows intervals and treating all the mulberry rows including self trap cropping rows with 0.5% neem oil emulsion) were considered. The results indicated that the incidence increased in T0 and T1 while the same suppressed in T2 and T3. The suppression (%) of tukra incidence between T2 and T3 was not significant. Hence, T2 only was recommended to farmers as its economical viable practice. The results are discussed based on the importance of tukra, its suppression and cost of treatment.
Sekar, S.,Priya, S.Sri Lavanya,Roy, P.Wesley The Korean Society of Plant Biotechnology 2000 Plant molecular biology and biotechnology research Vol.2 No.3
Optimization of chemicals in the large scale sea water medium and inoculum for biomass and natural colourants production in the marine cyanobacteria, Phomidium tenue BDU 46241 (phycoerythrin producer) and P.valderianum BDU 30501 (phycocyanin producer) was carried out by experiments in L8 orthogonal array. Mathematical analysis revealed the significance of these factors. The factor(s) that critically control the yield varied with the organism and the end-product further, the desirable level of these factors between the normal and a higher level tested was identified and improved media were evolved. In both cyanobacteria, higher level of $K_2$$HPO_4$, $NaNO_3$ and inoculum with normal level of ferric ammonium citrate was found to be desirable for biomass production and additionally, higher level of $MgSO_4$ for pigment production. The level of other factors varied with the organism and the end-product. Confirmation experiments showed that the clues obtained based on mathematical experimentation are valid. In P.tenue, the medium optimized for biomass production increased the yield of biomass by 495% and the medium optimized for phycoerythrin production increased the yield of biomass by 408% with 30% increase in phycoerythrin content of the biomass. Similarly in P.valderianum, the medium optimized for biomass production increased the yield of biomass by 224% and the medium optimized for phycocyanin production increased the yield of biomass by 143% with 44% increase in phycocyanin content of the biomass.
Latha, K. Lavanya,Rao, T.V.S.S.,Rao, J. V. Krishna,Jayaraj, S.,Reddy, N. Sivarami,Naik, S. Sankar Korean Society of Sericultural Science 2008 International Journal of Industrial Entomology Vol.17 No.2
A field study on self trap cropping system in controlling tukra mealy bug Maconellicoccus hirsutus Green) incidence on mulberry (Morus spp.; V-1 variety; $3'{\times}3'$ spacing) gardens was undertaken in selected sericulture farmers' mulberry gardens of Pydeti village (Parigi Mandal, Anantapur District, Andhra Pradesh, India). The study was conducted for three years (2004, 2005 and 2006). Four treatments (T0; control/no treatment, T1; self trap cropping rows with 10 row interval, T2; self trap cropping rows with 10 row interval and treating these rows only with 0.5% neem oil emulsion and T3; self trap cropping rows with 10 rows intervals and treating all the mulberry rows including self trap cropping rows with 0.5% neem oil emulsion) were considered. The results indicated that the incidence increased in T0 and T1 while the same suppressed in T2 and T3. The suppression (%) of tukra incidence between T2 and T3 was not significant. Hence, T2 only was recommended to farmers as its economical viable practice. The results are discussed based on the importance of tukra, its suppression and cost of treatment.
Prevalence of Disaccharidase Deficiency in Adults With Unexplained Gastrointestinal Symptoms
( Lavanya Viswanathan ),( Satish S C Rao ),( Kevin Kennedy ),( Amol Sharma ),( Yun Yan ),( Enoe Jimenez ) 대한소화기기능성질환·운동학회(구 대한소화관운동학회) 2020 Journal of Neurogastroenterology and Motility (JNM Vol.26 No.3
Background/Aims Disaccharidase assay is used for assessing carbohydrate intolerance in children, but its usefulness in adults is not known. The aim of this study is to assess the prevalence of disaccharidase deficiency in patients with unexplained gastrointestinal symptoms. Methods A retrospective review of adults with chronic (> 1 year) abdominal symptoms and negative imaging and endoscopy/colonoscopy and who completed bowel symptom questionnaire and duodenal biopsy for lactase, maltase, sucrase, and palatinase was performed. A subset also underwent 25 g lactose breath test (LBT). Results One hundred twenty patients (females = 83) were evaluated, of whom 48 also underwent LBT. Fifty-six (46.7%) patients had enzyme deficiency; 44 (36.7%) had single (either lactase or maltase), 1 had 3 enzyme deficiencies, 11 (9.2 %) had all 4 disaccharidase enzyme (pan-disaccharidase) deficiency, and 64 (53.0%) had normal enzyme levels. Baseline prevalence and severity of 11 gastrointestinal symptoms were similar between normal and single enzyme deficiency groups. The sensitivity and specificity of LBT was 78.3% and 72.0%, respectively and overall agreement with lactase deficiency was 75.0%. Conclusions Isolated disaccharidase deficiency occurs in adults, usually lactase and rarely maltase, and pan-disaccharidase deficiency is rare. Baseline symptoms or its severity did not predict enzyme deficiency. (J Neurogastroenterol Motil 2020;26:384-390)