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Padmanabhan Seshaiyer,Jennifer Suh 한국수학교육학회 2022 수학교육연구 Vol.25 No.3
This paper details case study vignettes that focus on enhancing the teaching and learning of geometry and measurement in the elementary grades with attention to pedagogical practices for teaching through problem solving with rigor and centering equitable teaching practices. Rigor is a matter of equity and opportunity (Dana Center, 2019). Rigor matters for each and every student and yet research indicates historically disadvantaged and underserved groups have more of an opportunity gap when it comes to rigorous mathematics instruction (NCTM, 2020). Along with providing a conceptual framework that focuses on the importance of equitable instruction, our study unpacks ways teachers can leverage their deep understanding of geometry and measurement learning trajectories to amplify the mathematics through rigorous problems using multiple approaches including learning by doing, challenged-based and mathematical modeling instruction. Through these vignettes, we provide examples of tasks taught through rigorous problem solving approaches that support conceptual teaching and learning of geometry and measurement. Specifically, each of the three vignettes presented includes a task that was implemented in an elementary classroom and a vertically articulated task that engaged teachers in a professional learning workshop. By beginning with elementary tasks to more sophisticated concepts in higher grades, we demonstrate how vertically articulating a deeper understanding of the learning trajectory in geometric thinking can add to the rigor of the mathematics.
Padmanabhan, Sutha,Kaliyappan, Kannan The Korean Institute of Electrical Engineers 2014 Journal of Electrical Engineering & Technology Vol.9 No.1
A wind generator (WG) maximum power point tracking (MPPT) system is presented here. It comprises of a variable-speed wind generator, a high-efficiency boost-type dc/dc converter and a control unit. The advantages of the aimed system are that it does not call for the knowledge of the wind speed or the optimal power characteristics and that it operates at a variable speed, thus providing high efficiency. The WG operates at variable speed and thus suffers lower stress on the shafts and gears compared to constant-speed systems. It results in a better exploitation of the available wind energy, especially in the low wind-speed range of 2.5-4.5 m/s. It does not depend on the WG wind and rotor-speed ratings or the dc/dc converter power rating. Higher reliability, lower complexity and cost, and less mechanical stress of the WG. It can be applied to battery-charging applications.
Hepatoprotective Role of Ferulic Acid: A Dose-Dependent Study
Venugopal Padmanabhan Menon,Kode Aruna,Penumathsa Suresh Varma,Rajagopalan Rukkumani 한국식품영양과학회 2004 Journal of medicinal food Vol.7 No.4
Alcohol use is contributing to an unprecedented decline in life expectancy. Damage to the liver after ethanoladministration is a well-known phenomenon. Free radical mechanisms have been proposed to play a part in ethanol-inducedliver toxicity. Ingestion of diets rich in polyunsaturated fatty acids (PUFAs) along with alcohol is known to result in enhancedliver damage. The present work is aimed at evaluating the protective role of ferulic acid, a naturally occurring plant compo-nent, on alcohol- and PUFA-induced liver toxicity. Three different doses of ferulic acid (10, 20, and 40 mg/kg of body weight)were administered to rats given alcohol, heated PUFA (.PUFA), and alcohol . . PUFA. Influence of ferulic acid on alco-hol- and PUFA-induced liver damage was evaluated by analyzing the activities of the liver marker enzymes alkaline phos-phatase, .-glutamyl transferase, alanine transaminase, and aspartate transaminase. The activities of these liver marker enzymeswere increased in the alcohol, .PUFA, and alcohol .. PUFA groups but were decreased significantly on treatment with fer-ulic acid. The low dose (10 mg/kg of body weight) was not effective, but both 20 mg and 40 mg/kg of body weight werefound to be effective. The 20 mg/kg of body weight dose was found to be more effective than 40 mg/kg of body weight (thehigh dose). The administration of ferulic acid to normal rats did not produce any harmful effects. Thus our results show thatferulic acid is an effective anti-hepatotoxic agent without side effects and may be a good candidate in the current search fora natural hepatoprotective agent.
Santhosh, Padmanabhan,Manesh, Kalayil Manian,Lee, Se-Hee,Uthayakumar, Sivaperumal,Gopalan, Anantha Iyengar,Lee, Kwang-Pill Royal Society of Chemistry 2011 The Analyst Vol.136 No.8
<P>In the present communication, a novel composite nanofibrous electrode is developed for the detection of superoxide anion (O<SUB>2</SUB>˙<SUP>−</SUP>) in phosphate buffered saline (PBS). The composite fiber electrode is fabricated by dispersing gold nanoparticles onto poly(methyl methacrylate) (PMMA)–polyaniline (PANI) core–shell electrospun nanofibers. The constructed architecture is proven to be a favorable environment for the immobilization of the enzyme, superoxide dismutase (SOD). Direct electron transfer is achieved between SOD and the electrode with an electron transfer rate constant of 8.93 s<SUP>−1</SUP>. At an applied potential of +300 mV, PMMA/PANI–Au<SUB>nano</SUB>/SOD–ESCFM shows highly sensitive detection of O<SUB>2</SUB>˙<SUP>−</SUP>. In addition to this, quantification of different activities of SOD is realized at PMMA/PANI–Au<SUB>nano</SUB>/SOD–ESCFM. These analytical features offer great potential for construction of the third-generation O<SUB>2</SUB>˙<SUP>−</SUP> biosensor.</P> <P>Graphic Abstract</P><P>A novel composite nanofibrous electrode is developed for the detection of superoxide anion in phosphate buffer saline. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c0an00616e'> </P>
Cloud-based Home Energy Management (HEM) and Modeling of Consumer Decisions
Poornima Padmanabhan,Gary R. Waissi 보안공학연구지원센터 2016 International Journal of Smart Home Vol.10 No.8
With the increasing number of smart home devices and the widespread availability of broadband communications, intelligent products built on the computational power and scalability of cloud, have the potential to reach beyond traditional markets. Cloud-based Home Energy Management (HEM) paradigm can provide intuitive and automated services that can not only save money and energy but also improve the quality of lives of consumers. This paper provides a detailed summary of the literature review of HEM and proposes (1) a conceptual smart home model with a special integration of solar powered devices with the cloud, (2) a limited consumer survey, and (3) a Multi-Attribute Modeling (MAM) with an example application for consumer adoption of Home Energy Management System (HEMS) and allied devices. The results of literature research and an online survey point out that the surveyed consumers acknowledge the importance of energy efficiency in their daily lives and lean towards adopting cloud-based smart home devices for their needs. The bottom line for adopting HEMS is the availability of secure, robust and cost-effective solutions coupled with considerable money-saving potential.
Santhosh, Padmanabhan,Manesh, Kalayil ,Manian,Lee, Kwang-Pill,Gopalan, Anantha ,Iyengar WILEY-VCH Verlag 2006 Electroanalysis Vol.18 No.9
<P>A new modified electrode having multiwall carbon nanotube (MWNT) grafted with polydiphenylamine (PDPA) as electrocatalytic layer is fabricated. FESEM image of the modified electrode shows a different morphology indicating the grafting of PDPA over MWNT. This morphology is in quite contrast from the conventional bilayer MWNT/conducting polymer modified electrode. The multiwall carbon nanotube grafted polydiphenylamine (MWNT-g-PDPA-ME) shows excellent electrocatalytic activity towards the reduction of hydrogen peroxide. The combined presence of MWNT and PDPA as a single unit provides better sensitivity than the bilayer configuration (MWNT/PDPA-ME). This modified electrode shows accelerated electron transfer at the interface with minimized surface fouling and surface renewability. The advantages of MWNT-g-PDPA-ME over the bilayer electrode are demonstrated with chronoamperometric studies. The amperometric response to H<SUB>2</SUB>O<SUB>2</SUB> obtained at −300 mV (vs. SCE) is rapid and highly sensitive as evident from the higher (2.83×10<SUP>−3</SUP> cm<SUP>3</SUP> mol<SUP>−1</SUP> s<SUP>−1</SUP>) rate constant for the diffusion reduction process.</P>
Sutha Padmanabhan,Kannan Kaliyappan 대한전기학회 2014 Journal of Electrical Engineering & Technology Vol.9 No.1
A wind generator (WG) maximum power point tracking (MPPT) system is presented here. It comprises of a variable-speed wind generator, a high-efficiency boost-type dc/dc converter and a control unit. The advantages of the aimed system are that it does not call for the knowledge of the wind speed or the optimal power characteristics and that it operates at a variable speed, thus providing high efficiency. The WG operates at variable speed and thus suffers lower stress on the shafts and gears compared to constant-speed systems. It results in a better exploitation of the available wind energy, especially in the low wind-speed range of 2.5-4.5 m/s. It does not depend on the WG wind and rotorspeed ratings or the dc/dc converter power rating. Higher reliability, lower complexity and cost, and less mechanical stress of the WG. It can be applied to battery-charging applications.