751 research outputs found
Stabilities and Non-Stabilities of a New Reciprocal Functional Equation
No full textThe intention of this study is to present some stronger results by investigating Ulam-JRassias product stability and Ulam-JRassias mixed-type sum-product stability of a new reciprocal functional equation. Also, a suitable counter-example is presented to show the failure of stability result for the singular case. © 2022 B. V. Senthil Kumar et al., published by Sciendo
Correlation between the structural, electrical and electrochemical performance of layered Li(Ni0.33Co0.33Mn0.33)O2 for lithium ion battery
No full textThe Li(Ni0.33Co0.33Mn0.33)O2 (LNCMO) cathode material is prepared by poly(vinyl pyrrolidone) (PVP)-assisted sol-gel/hydrothermal and poly(ethylene glycol)-block-poly(propylene glycol)-block-poly (ethylene glycol) (Pluronic-P123)-assisted hydrothermal methods. The compound prepared by PVP-assisted hydrothermal method shows a comparatively higher electrical conductivity of ~2 × 10−5 S cm−1 and exhibits a discharge capacity of 152 mAh g−1 in the voltage range of 2.5 to 4.4 V, for a C-rate of 0.2 C, whereas the compounds prepared by P123-assisted hydrothermal method and PVP-assisted sol-gel method show a total electrical conductivity in the order of 10−6 S cm−1 and result in poor electrochemical performance. The structural and electrical properties of LNCMO (active material) and its electrochemical performance are correlated. The difference in percentage of ionic and electronic conductivity contribution to the total electrical conductivity is compared by transference number studies. The cation disorder is found to be the limiting factor for the lithium ion diffusion as determined from ionic conductivity values. © 2015, Springer-Verlag Berlin Heidelberg.1
Phytochemical analysis, antioxidant and antimicrobial activity of wildand in vitro derived plants of Ceropegia thwaitesii Hook – An endemicspecies from Western Ghats, India
No full textCeropegia thwaitesii Hook (Asclepiadaceae), an endemic plant species, due to habitat destruction and overexploitation has a very restricted distribution in the Western Ghats of Tamil Nadu, India. The presentwrok aimed to determine the chemical composition, the total phenolic (TPC), flavonoid (TFC) and tannincontent (TEC), and to assess the antioxidant properties of various extracts of in vivo plants (IVP) andin vitro regenerated plants (IRP) of C. thwaitesii. Some phenolic compounds like gallic acid, cathechol,vanillin and salicylic acid were identified and quantified by HPLC. All the extracts possessed relevant rad-ical scavenging activity on DPPH, Superoxide radical scavenging activity, and Nitric oxide radicals as wellas total antioxidant ability. DPPH assay of in vitro methanol stems extracts and ethanol leaves extractsrevealed the best antioxidant properties with important IC50values of 0.248 ± 0.45 mg/mL and 0.397 ±0.67 mg/mL, respectively, whereas in vivo chloroform stems extracts showed a lower antioxidant activity(IC50of 10.99 ± 0.24 mg/mL). The IRP methanol extracts of stem and leaves had good inhibitory activityagainst all tested microorganisms in a dose-dependent manner. These results suggested that in vitroraised plants of C. thwaitesii are an excellent source of antioxidant compounds to be exploited on anindustrial level as food additive
Fuzzy expert systems and applications in agricultural diagnosis/ A.V. Senthil Kumar, M. Kalpana.
No full text1 online resource (355 pages
Challenges and applications for implementing machine learning in computer vision/ Ramgopal Kashyap, Amity University, Raipur, India, A.V. Senthil Kumar, Hindusthan College of arts and science, India.
No full textIncludes bibliographical references (pages 271-287) and index."This book examines the latest advances and trends in computer vision and machine learning algorithms for various applications"--Chapter 1. Development of class attendance system using face recognition for faculty of mechanical and manufacturing engineering, Universiti Tun Hussein Onn Malaysia -- Chapter 2. Deep learning in computational neuroscience -- Chapter 3. Advanced diagnosis techniques in medical imaging -- Chapter 4. Challenges of applying deep learning in real-world applications -- Chapter 5. Challenges and applications for implementing machine learning in computer vision: machine learning applications and approaches -- Chapter 6. Medical imaging importance in the real world -- Chapter 7. Image processing approaches and disaster management -- Chapter 8. Artificial intelligence and machine learning algorithms -- Chapter 9. Application of content-based image retrieval in medical image acquisition -- Chapter 10. Machine learning for health data analytics: a few case studies of application of regression.1 online resource (xxv, 293 pages)
Differential interactions of thin filament proteins in two cardiac troponin T mouse models of hypertrophic and dilated cardiomyopathies
No full textAim: Mutations in a sarcomeric protein can cause hypertrophic cardiomyopathy (HCM) or dilated cardiomyopathy (DCM), the opposite ends of a spectrum of phenotypic responses of the heart to mutations. We posit the contracting phenotypes could result from differential effects of the mutant proteins on interactions among the sarcomeric proteins. To test the hypothesis, we generated transgenic mice expressing either cardiac troponin T (cTnT)-Q92 or cTnT-W141, known to cause HCM and DCM, respectively, in the heart. Methods and results: We phenotyped the mice by echocardiography, histology and immunoblotting, and real-time polymerase chain reaction. We detected interactions between the sarcomeric proteins by co-immunoprecipitation and determined Ca2+ sensitivity of myofibrillar protein ATPase activity by Carter assay. The cTnT-W141 mice exhibited dilated hearts and decreased systolic function. In contrast, the cTnT-Q92 mice showed smaller ventricles and enhanced systolic function. Levels of cardiac troponin I, cardiac α-actin, α-tropomyosin, and cardiac troponin C co-immunoprecipitated with anti-cTnT antibodies were higher in the cTnT-W141 than in the cTnT-Q92 mice, as were levels of α-tropomyosin co-immunoprecipitated with an anti-cardiac α-actin antibody. In contrast, levels of cardiac troponin I co-immunoprecipitated with an anti-cardiac α-actin antibody were higher in the cTnT-Q92 mice. Ca2+ sensitivity of myofibrillar ATPase activity was increased in HCM but decreased in DCM mice compared with non-transgenic mice. Conclusion: Differential interactions among the sarcomeric proteins containing cTnT-Q92 or cTnT-W141 are responsible for the contrasting phenotypes of HCM or DCM, respectively. © The Author 2008
In Vitro Antioxidant and Insulin Mimetic Activities of Heteroleptic Oxovanadium(IV) Complexes with Thiosemicarbazones and Naproxen
No full textSix heteroleptic oxovanadium(IV) complexes with general formula [VOL1–6(nap)], where, L1–3=2-(1-(4-substitutedphenyl)ethylidene)hydrazinecarbothioamide, L4–6=2-(1-(4-substitutedphenyl)ethylidene)-N-methylhydrazinecarbothioamide and nap=naproxen, have been synthesized and characterized. FTIR spectra exhibit a strong band between 965 and 991 cm−1, characteristic of υ(V=O) stretching vibration. UV-Vis and theoretical studies suggested distorted square-pyramidal geometry and oxidation state of vanadium(IV) with d1 configuration was confirmed by EPR spectra. Cyclic voltammograms exhibit metal based irreversible redox peaks corresponding to one electron oxidation (+0.83 to +0.70 V) and reduction (−0.69 to −0.53 V) processes. In vitro antioxidant studies revealed that complexes containing electron donating substituent (−CH3) showed higher activity. In vitro antidiabetic activity of complexes with enzymes like α-amylase, α-glucosidase and glucose-6-phosphatase made them better inhibitors of insulin, which is further supported by in silico studies, and complex 6 shows better in vitro insulin mimic activity against insulin responsive 3T3-L1 adipocyte cells compared to insulin and metformin.No Full Tex
Ordered LiFe5O8 thin films prepared by pulsed laser deposition as an anode material for all-solid thin film batteries
No full textThe search for obtaining a Co free low-cost and high-capacity anode thin film material for high energy density all-solid thin film batteries has been driving the increasing innovation and research in Li-ion battery (LIB) technology. In the present case, LiFe5O8 (LFO) thin films are prepared by pulsed laser deposition (PLD) technique and their electrochemical properties, Li ion dynamics, conducting processes at various frequencies and current rates are explored. LFO thin films are seen to crystallize in ordered alpha-phase with an inverse spinel structure. Chemical state of all the elements is analysed using X-ray photoelectron spectroscopy method. Cyclic voltam-meter (CV) study carried out between 0-3 V shows the reduction peak at 0.76 V initially and in the later cycles at 0.86 V with a small shift depicting the exact conversion type behaviour of the LFO thin film. LFO thin film exhibits specific discharge capacity of 25 mu Ah/cm2 at 10 mu A/cm2 current density during the first cycle. Rate capability measurements are carried out at various current densities of 10, 20, 30, 40, 50 and 10 mu A/cm2. Li-ion diffusion coefficient during the de-lithiation and lithiation process is seen to be 3.78 x 10-14 cm2/s and 1.41 x 10-13 cm2/s, respectively. CV studies at various scan rates indicates that the mechanism of Li+ storage is dominated by a diffusion-controlled process at low scan rates and with increasing scan rate it becomes a surface-controlled process. Electrochemical impedance studies at various frequencies shows the decrease in charge transfer resistance with increasing cycles. Combined structural, chemical, electrochemical and impedance studies of LFO thin films indicates that these films can be employed for fabricating Co and Ni free all-solid thin film Li -ion batteries for energy storage applications.
Phosphazene-Based Covalent Organic Polymer Decorated with NiCo2O4Nanocuboids as a Trifunctional Electrocatalyst: A Unique Replacement for the Conventional Electrocatalysts
No full textDeveloping nonprecious metal-based electrocatalysts to convert water into green fuels (H2 and O2) is key to address urgent climate and energy challenges. We have prepared an electrocatalyst by the immobilization of NiCo2O4 on a phosphazene-based covalent organic polymer (P-COP) through a facile hydrothermal method. The elemental composition of the P-COP showed the presence of a greater amount of heteroatoms N (6.62%) and P (5.62%) throughout the polymer support. Scanning transmission electron microscopy (STEM) and electron energy loss spectroscopy (EELS) were utilized to determine the atomic structure of the nanocuboids, which depicted the formation of an inverse spinel structure. A NiCo2O4-P-COP-based electrode was simultaneously used for the oxygen evolution reaction (OER) and hydrogen evolution reaction (HER), and it displayed a minimum overpotential of 270 and 130 mV (V vs RHE), respectively, at a current density of 10 mA cm-2. In addition, it acted as an oxygen reduction catalyst with a half-wave potential of 0.83 V (V vs RHE) and a maximum current density of 4.5 mA cm-2. The electrocatalytic activity is comparable with that of the commercially available Pt and RuO2 catalysts. The combined experimental and computational studies confirm that the catalytic centers formed through the interaction between the heteroatoms (N and P) in the phosphazene matrix and metal oxides (Co and Ni) play an important role in its improved durability and electrocatalytic activity
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