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Addition Reaction of Cyclopropane with Magnesium Dihydride (MgH<sub>2</sub>): A Theoretical Study
Singh, Satya Prakash,Meena, Jay Singh,Thankachan, Pompozhi Protasis Korean Chemical Society 2013 대한화학회지 Vol.57 No.6
The addition reaction of cyclopropane with $MgH_2$ has been investigated using the B3LYP density functional method employing several split-valence basis sets. Both along the and perpendicular to the cyclopropane ring approach has been reported. It is shown that the reaction proceeds via a four-centered transition state. Calculations at higher levels of theory were also performed at the geometries optimized at the B3LYP level, but only slight changes in the barriers were observed. Structural parameters for the transition state are also reported.
Singh, Jay,Roychoudhury, Appan,Srivastava, Manish,Chaudhary, Vidhi,Prasanna, Radha,Lee, Dong Won,Lee, Seung Hee,Malhotra, B. D. American Chemical Society 2013 JOURNAL OF PHYSICAL CHEMISTRY C - Vol.117 No.16
<P>A new hybrid nanocomposite based on hydrothermally synthesized nanostructured NiFe<SUB>2</SUB>O<SUB>4</SUB> (<I>n</I>-NiFe<SUB>2</SUB>O<SUB>4</SUB>) and chitosan (CH) has been explored for bienzyme (cholesterol esterase (ChEt) and cholesterol oxidase (ChOx)) immobilization for application as total cholesterol biosensor. Results of X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), Fourier transform infrared (FTIR), Raman spectroscopy (RS) and vibrating sample magnetometer (VSM) studies demonstrate that the ChEt–ChOx/<I>n</I>-NiFe<SUB>2</SUB>O<SUB>4</SUB>–CH composite film is successfully synthesized. The obtained ChEt–ChOx/<I>n</I>-NiFe<SUB>2</SUB>O<SUB>4</SUB>–CH nanocomposite film shows large specific area, high conductivity, good biocompatibility, fast redox properties and improved antimicrobial activity. The fabricated ChEt–ChOx/<I>n</I>-NiFe<SUB>2</SUB>O<SUB>4</SUB>–CH/ITO bioelectrode exhibits largely improved amperometric biosensing performance, i.e., good linearity (5–400 mg/dL), low detection limit (24.46 mg/dL cm<SUP>–2</SUP>), high sensitivity of 1.73 μA/(mg/dL cm<SUP>–2</SUP>), fast response time of 15s, reproducibility of more than 15 times, shelf life of about 90 days and low Michaelis–Menten constant (<I>K</I><SUB><I>m</I></SUB>) value as 7.05 mg/dL (0.1825 mM). Furthermore, this modified bioelectrode has been utilized for estimation of total cholesterol in human serum samples. This efficient strategy provides new insight into the design of novel flexible electrodes for a wide range of applications in biosensing, bioelectronics, and clinical applications.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/jpccck/2013/jpccck.2013.117.issue-16/jp312698g/production/images/medium/jp-2012-12698g_0009.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/jp312698g'>ACS Electronic Supporting Info</A></P>
ON A CLASS OF GENERALIZED RECURRENT (k, 𝜇)-CONTACT METRIC MANIFOLDS
Khatri, Mohan,Singh, Jay Prakash Korean Mathematical Society 2020 대한수학회논문집 Vol.35 No.4
The goal of this paper is the introduction of hyper generalized 𝜙-recurrent (k, 𝜇)-contact metric manifolds and of quasi generalized 𝜙-recurrent (k, 𝜇)-contact metric manifolds, and the investigation of their properties. Their existence is guaranteed by examples.
GENERALIZED m-QUASI-EINSTEIN STRUCTURE IN ALMOST KENMOTSU MANIFOLDS
Mohan Khatri,Jay Prakash Singh Korean Mathematical Society 2023 대한수학회보 Vol.60 No.3
The goal of this paper is to analyze the generalized m-quasi-Einstein structure in the context of almost Kenmotsu manifolds. Firstly we showed that a complete Kenmotsu manifold admitting a generalized m-quasi-Einstein structure (g, f, m, λ) is locally isometric to a hyperbolic space ℍ<sup>2n+1</sup>(-1) or a warped product ${\tilde{M}}{\times}{_{\gamma}{\mathbb{R}}$ under certain conditions. Next, we proved that a (κ, µ)'-almost Kenmotsu manifold with h' ≠ 0 admitting a closed generalized m-quasi-Einstein metric is locally isometric to some warped product spaces. Finally, a generalized m-quasi-Einstein metric (g, f, m, λ) in almost Kenmotsu 3-H-manifold is considered and proved that either it is locally isometric to the hyperbolic space ℍ<sup>3</sup>(-1) or the Riemannian product ℍ<sup>2</sup>(-4) × ℝ.
Aniruddha Mondal,Jay Chandra Dhar,P Chinnamuthu,Naorem Khelchand Singh,Kalyan Kumar Chattopadhyay,Sanat Kumar Das,Santosh Ch Das,Anirban Bhattacharyya 대한금속·재료학회 2013 ELECTRONIC MATERIALS LETTERS Vol.9 No.2
Symmetrical TiO2 nanowire (NW) arrays have been synthesized on Si by using glancing angle deposition technique. The Raman spectrum of TiO2 thin film (TF) and TiO2 NWs sample indicates the presence of both anatase and rutile phase TiO2. The electrical properties of the vertically ordered TiO2 NW arrays have been measured. The leakage current for high-k TiO2/Si capacitance reduced with the addition of TiO2 NWs on 30 nm TF. TiO2 NW dielectric was employed to achieve large conduction band offset between oxide layer and Si. A high gate capacitance has been observed due to NW effect. The barrier height between Ag/TiO2-NW interfaces was 0.9 eV and an exclusively lowest leakage current of 8.8 × 10−7 A/cm2 (at +1 V)was reported for the TiO2 NW device.
Recent advances in graphene and its metal-oxide hybrid nanostructures for lithium-ion batteries
Srivastava, Manish,Singh, Jay,Kuila, Tapas,Layek, Rama K.,Kim, Nam Hoon,Lee, Joong Hee The Royal Society of Chemistry 2015 Nanoscale Vol.7 No.11
<P>Today, one of the major challenges is to provide green and powerful energy sources for a cleaner environment. Rechargeable lithium-ion batteries (LIBs) are promising candidates for energy storage devices, and have attracted considerable attention due to their high energy density, rapid response, and relatively low self-discharge rate. The performance of LIBs greatly depends on the electrode materials; therefore, attention has been focused on designing a variety of electrode materials. Graphene is a two-dimensional carbon nanostructure, which has a high specific surface area and high electrical conductivity. Thus, various studies have been performed to design graphene-based electrode materials by exploiting these properties. Metal-oxide nanoparticles anchored on graphene surfaces in a hybrid form have been used to increase the efficiency of electrode materials. This review highlights the recent progress in graphene and graphene-based metal-oxide hybrids for use as electrode materials in LIBs. In particular, emphasis has been placed on the synthesis methods, structural properties, and synergetic effects of metal-oxide/graphene hybrids towards producing enhanced electrochemical response. The use of hybrid materials has shown significant improvement in the performance of electrodes.</P>
Manish Srivastava,Jay Singh,Rajneesh K. Mishra,Manish K. Singh,Animesh K. Ojha,Madhu Yashpal,Srivastava Sudhanshu 한국물리학회 2014 Current Applied Physics Vol.14 No.7
A study on Lithium ferrite/chitosan nanocomposite (LFCN), easily moldable into arbitrary shapes, as the conducting polymer and ferromagnetic characteristics is presented. The composite material is produced in the presence of Li0.5Cr0.1Fe2.4O4 and Li0.5Co0.1Fe2.4O4 nanoparticle by ex-situ polymerizations process. Various characterizations techniques have been used to explore the characteristic of the synthesized products. The frequency dependent dielectric properties and electrical conductivity of all the samples have been measured through complex impedance plot in the frequency range of 1 kHze6 MHz at room temperature. It was observed that in case of (LFCN), fluctuation in value of (ε 0) and (ε 00) is ceased over the frequency range of 4 Mz which can be attributed to the steady storage and dissipation of energy in the nanocomposite system. Moreover, it is also observed that electrical conductivity of (LFCN) increases with frequency and its value was found to be (0.032e0.048) (ohm-cm)1 in frequency range of 1 kHze6 MHz. Due to its low cost, a simple synthesis process and high flexibility, the proposed LFCN may find applications in various types of electronic components.
On a class of generalized recurrent $(k,\mu)$-contact metric manifolds
Mohan Khatri,Jay Prakash Singh 대한수학회 2020 대한수학회논문집 Vol.35 No.4
The goal of this paper is the introduction of hyper generalized $\phi$-recurrent $(k,\mu)$-contact metric manifolds and of quasi generalized $\phi$-recurrent $(k,\mu)$-contact metric manifolds, and the investigation of their properties. Their existence is guaranteed by examples.
ON SOME CLASSES OF WEAKLY Z-SYMMETRIC MANIFOLDS
Lalnunsiami, Kingbawl,Singh, Jay Prakash Korean Mathematical Society 2020 대한수학회논문집 Vol.35 No.3
The aim of the paper is to study some geometric properties of weakly Z-symmetric manifolds. Weakly Z-symmetric manifolds with Codazzi type and cyclic parallel Z tensor are studied. We consider Einstein weakly Z-symmetric manifolds and conformally flat weakly Z-symmetric manifolds. Next, it is shown that a totally umbilical hypersurface of a conformally flat weakly Z-symmetric manifolds is of quasi constant curvature. Also, decomposable weakly Z-symmetric manifolds are studied and some examples are constructed to support the existence of such manifolds.
( Rajesh Bawale ),( Jay Watson ),( Karshe Yusuf ),( Dilip Pillai ),( Bijayendra Singh ) 대한외상학회 2022 大韓外傷學會誌 Vol.35 No.2
Bacterial infection of skeletal muscle can lead to the formation of abscesses. Primary pyomyositis is typically seen in tropical countries, and Staphylococcus aureus is the commonest causative organism. We present a case of acute adductor magnus muscle abscess (pyomyositis) with spread to adjacent thigh compartments via the perforators without iliopsoas muscle involvement. Due to the involvement of the entire thigh compartment, systemic antibiotic treatment alone was insufficient, whereas surgical drainage improved the clinical picture. The aetiological organism was S. aureus. Herein, we report the case of a patient who had primary pyomyositis, rather than a secondary type, that spread to the posterior and lateral aspect of the thigh through the second and third perforators, which pierce the adductor magnus muscle belly before entering the femur.