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Dielectric Study of Methyl Acrylate-Alcohol Mixtures Using Time Domain Reflectometry
Dharmalingam, K.,Ramachandran, K.,Sivagurunathan, P.,Prabhakar , B.,Khirade, P.W.,Mehrotra, S.C. Korean Chemical Society 2006 Bulletin of the Korean Chemical Society Vol.27 No.12
Dielectric studies of methyl acrylate with 1-propanol, 1-butanol, 1-heptanol and 1-octanol binary mixtures have been carried out over the frequency range from 10 MHz to 10 GHz at temperatures of 283, 293, 303 and 313 K using Time Domain Reflectometry (TDR) for various concentrations. The Kirkwood correlation factor and excess inverse relaxation time were determined and discussed to yield information on the molecular structure and dynamics of the mixture. The values of the static dielectric constant, relaxation time and the Kirkwood correlation factor decrease with increased concentration of methyl acrylate in alcohol. The Bruggman plot shows a non-linearity of the curves for all the systems studied indicates the heterointeraction which may be due to hydrogen bonding of the OH group of alcohol with C=O of the methyl acrylate. The excess inverse relaxation time values are negative for all the systems at all the temperatures indicates that the solute-solvent interaction hinders the rotation of the dipoles of the system.
Dielectric Study of Methyl Acrylate-Alcohol Mixtures Using Time Domain Reflectometry
K. Dharmalingam*,K. Ramachandran,P. Sivagurunathan,B. Prabhakar Undre,P. W. Khirade,S. C. Mehrotra 대한화학회 2006 Bulletin of the Korean Chemical Society Vol.27 No.12
Dielectric studies of methyl acrylate with 1-propanol, 1-butanol, 1-heptanol and 1-octanol binary mixtures have been carried out over the frequency range from 10 MHz to 10 GHz at temperatures of 283, 293, 303 and 313 K using Time Domain Reflectometry (TDR) for various concentrations. The Kirkwood correlation factor and excess inverse relaxation time were determined and discussed to yield information on the molecular structure and dynamics of the mixture. The values of the static dielectric constant, relaxation time and the Kirkwood correlation factor decrease with increased concentration of methyl acrylate in alcohol. The Bruggman plot shows a non-linearity of the curves for all the systems studied indicates the heterointeraction which may be due to hydrogen bonding of the OH group of alcohol with C=O of the methyl acrylate. The excess inverse relaxation time values are negative for all the systems at all the temperatures indicates that the solute-solvent interaction hinders the rotation of the dipoles of the system.
Probiotic LAB Stimulates Longevity and Reduces Cholesterol Levels in Cholesterol-Fed C. Elegans
Eric B-M Daliri,Yeju Kim,Ramachandran C,Mohammad Shakhawat Hussain,Momna Rubab,Fred Kwame Ofosu,Min-Yeong Kwon,Chen Xiuqin,Eun-ji Park,Hyeon-Yeong Jo,Su-Bin Hwang,Deog-Hwan Oh 한국식품영양과학회 2018 한국식품영양과학회 학술대회발표집 Vol.2018 No.10
Chan, Juliana C.N.,Gagliardino, Juan Jose,Baik, Sei Hyun,Chantelot, Jean-Marc,Ferreira, Sandra R.G.,Hancu, Nicolae,Ilkova, Hasan,Ramachandran, Ambady,Aschner, Pablo American Diabetes Association 2009 Diabetes care Vol.32 No.2
<P><B>OBJECTIVE</B>—The International Diabetes Mellitus Practice Study is a 5-year survey documenting changes in diabetes treatment practice in developing regions.</P><P><B>RESEARCH DESIGN AND METHODS</B>—Logistic regression analysis was used to identify factors for achieving A1C <7% in 11,799 patients (1,898 type 1 diabetic and 9,901 type 2 diabetic) recruited by 937 physicians from 17 countries in Eastern Europe (<I>n</I> = 3,519), Asia (<I>n</I> = 5,888), Latin America (<I>n</I> = 2,116), and Africa (<I>n</I> = 276).</P><P><B>RESULTS</B>—Twenty-two percent of type 1 diabetic and 36% of type 2 diabetic patients never had A1C measurements. In those with values for A1C, blood pressure, and LDL cholesterol, 7.5% of type 1 diabetic (<I>n</I> = 696) and 3.6% of type 2 diabetic (<I>n</I> = 3,896) patients attained all three recommended targets (blood pressure <130/80 mmHg, LDL cholesterol <100 mg/dl, and A1C <7%). Self-monitoring of blood glucose was the only predictor for achieving the A1C goal in type 1 diabetes (odds ratios: Asia 2.24, Latin America 3.55, and Eastern Europe 2.42). In type 2 diabetes, short disease duration (Asia 0.97, Latin America 0.97, and Eastern Europe 0.82) and treatment with few oral glucose–lowering drugs (Asia 0.64, Latin America 0.76, and Eastern Europe 0.62) were predictors. Other region-specific factors included lack of microvascular complications and old age in Latin America and Asia; health insurance coverage and specialist care in Latin America; lack of obesity and self-adjustment of insulin dosages in Asia; and training by a diabetes educator, self-monitoring of blood glucose in patients who self-adjusted insulin, and lack of macrovascular complications in Eastern Europe.</P><P><B>CONCLUSIONS</B>—In developing countries, factors pertinent to patients, doctors, and health care systems all impact on glycemic control.</P>
C. S. Ramachandran,V. Balasubramanian,R. Varahamoorthy 대한금속·재료학회 2010 METALS AND MATERIALS International Vol.16 No.2
Abrasive slurry wear is generally defined as a mechanical interaction in which the material becomes lost in a surface that is in contact with moving particles, such as laden liquid. Slurry wear abrasion occurs in extruders, slurry pumps, and pipes that carry the slurry of minerals and ores in mineral processing industries. The life of the components used under slurry abrasion conditions is governed by the process parameters,the properties of the abrasive particles in the slurry, and the material properties. This paper analyses in detail the effects of operating variables, such as abrasive particle size, slurry concentration, speed of rotation, and slurry bath temperature, on the abrasive slurry wear behavior of a iron based alloy (stainless steel), cobalt based alloy (stellite), and nickel based alloy (colmonoy) surfaces produced by a Plasma Transferred Arc (PTA) hardfacing process. Of the four variables considered in this investigation, it was found that the slurry concentration had a predominant effect on the wear rate of hardfaced surfaces compared to the other variables. Microstructural analyses of the worned surfaces were carried out using SEM. Both the experimental and mathematical investigations showed that the wear resistance of an iron based alloy was 4 times better than the base metal. Similarly, the cobalt based alloy exhibited a 3 times higher wear resistance while the nickel based alloy showed a 2 times higher wear resistance compared to the base metal (carbon steel).
Geoffrey Hackett,Nigel Cole,Akhilesh Mulay,Richard C. Strange,Sudarshan Ramachandran 대한남성과학회 2020 The World Journal of Men's Health Vol.38 No.1
UKPurpose: To describe the 4-year metabolic follow-up results from the BLAST study.Materials and Methods: Baseline hemoglobin A1c (HbA1c), weight, and waist circumference (WC) data were recorded in 185 men recruited for the BLAST randomised controlled trial (RCT) and erectile function (EF) scores were also available in an additional 48 men screened for the RCT. Intra/inter-group associations between these parameters and testosterone replacement therapy (TRT) were assessed at 1) end of the RCT (30 weeks), 2) open-label phase (82 weeks), and 3) final assessment via non-parametric statistics.Results: Improvement in HbA1c and weight at the end of the RCT and open-label phase in men on TRT was not maintained long-term. The convergence in HbA1c could have been due to incentivised care with HbA1c targets. Interestingly those on TRT at final assessment required fewer anti-diabetic agents. The weight increase in routine care may have been due to changes in diabetes medication or an increase in lean muscle mass. WC continued to decrease in men on TRT indicating possible reduction in visceral fat. Improvement in EF scores continued with long-term TRT, this was abolished when TRT was discontinued.Conclusions: This study hints at benefits in glycaemic control, weight and WC, and long-term RCTs studying mechanisms of benefit and clinical outcomes are necessary. Our results also show that EF scores continued to improve with long-term TRT, even beyond the 6 months that we previously reported in the BLAST RCT.
SOUPRAMANIEN, T.,RAMACHANDRAN, C.,CHO, NAK EUN The Korean Society for Computational and Applied M 2021 Journal of applied mathematics & informatics Vol.39 No.5
The aim of this article is to estimate the coefficient bounds of certain subclasses of analytic functions. We claim that this is a novel and unique effort in combining the coefficient functional along with the new domains and the probability distributions which have not been found or are available in the literature of coefficients bounds. Here the authors analyze these bounds in the special domains associated with exponential function and sine function. Further we obtain Fekete-Szegö inequalities for the defined subclasses of analytic functions defined through Poisson distribution series and Pascal distribution series.
M. Vijay,K. Ramachandran,P.V. Ananthapadmanabhan,B. Nalini,B.C. Pillai,Federica Bondioli,A. Manivannan,R.T. Narendhirakannan 한국물리학회 2013 Current Applied Physics Vol.13 No.3
Nanocrystalline TiO2 powder is synthesized using a novel reactive plasma process in which the precursor TiH2 powder is oxidized through thermal plasma in-flight route to generate nanocrystalline TiO2 powder. The synthesized powder consists of nano-sized TiO2 particles, both anatase and rutile phases, in which anatase is the predominant phase. An additional feature of the plasma synthesized TiO2 powder is the higher surface concentration of Ti3þ state and hydroxyl group that enhance its photocatalytic activity. The photocatalytic inactivation of Gram-positive Enterococcus and Gram-negative Klebsiella bacteria is studied using the plasma synthesized TiO2 nanopowder with 365 nm ultraviolet (UV) light. The mechanism behind the photocatalytic disinfection of bacteria is discussed. The plasma synthesized TiO2 nanopowder catalyst is found effective in killing Enterococcus and Klebsiella. The results corroborated that the plasma synthesized TiO2 powder can be used for waste water treatment and water purification.
Fekete-Szeg\"{o} problem for subclasses of starlike functions with respect to symmetric points
T. N. Shanmugam,C. Ramachandran,V. Ravichandran 대한수학회 2006 대한수학회보 Vol.43 No.3
In the present investigation, sharp upper bounds ofja3 a22j for functionsf(z) = z + a2z2 + a3z3 + belongingto certain subclas1ses of starlike and convex functions with respectto symmetric points are obtained. Also certain applications of themain results for subclasses of functions dened by convolution witha normalized analytic function are given. In particular, Fekete-Szego inequalities for certain classes of functions dened throughfractional derivatives are obtained.