V. Kumar

Indian Institute of Technology (ISM) Dhanbad | ISM

Excited states of the molybdenum isotopes Mo 42 97 , 99 , 101 have been populated in two experiments which used fusion-fission and binary grazing reactions to populate yrast states of the nuclei of interest. In the first experiment, the GASP array of escape-suppressed Ge detectors was used to detect γ rays from fusion-fission products initiated by...

Excited states of the neutron-rich niobium isotopes Nb96,97,98,4196,97,98,99 have been populated in two experiments which used fusion-fission and multinucleon binary grazing reactions to populate high-spin yrast states. In the multinucleon-transfer experiment, a 530-MeV beam of Zr96 ions was incident on a thin Sn124 target; projectile-like ejectile...

Transparent piezoelectric thin films on glass are sought after in piezoelectric microdevices. Here we report the fabrication of highly transparent (%T ≥ 70.0) Pb(Zr0.52Ti0.48)O3[PZT] thin films on indium tin oxide (ITO)-coated glass substrate. The effective transverse piezoelectric coefficient, e31,f, determined from both direct and converse piezoe...

In the quaternary system PbTiO3-PbZrO3-SrTiO3-SrZrO3, compositions that lie close to the antiferroelectric tetragonal and ferroelectric rhombohedral (AFET-FER) phase boundary have potential applications in micro-actuators. However, in thin films, this phase boundary is reported to shift significantly to the zirconium-rich region. Hence, it is neces...

A-site Sr-substituted Pb(Zr0.80Ti0.20)O3 composition (PSZT) with different Sr²⁺ content in the range, 0.15 ≤ x ≤ 0.20, and located near the AFE-FE phase boundary hold promise for microactuator applications. Thin films of PSZT with 1.0 µm thickness were fabricated on silicon substrates by chemical solution deposition by spin coating. The structure a...

The structural, electronic, and optical properties of hydrogenated silicene have been studied under different hydrostatic pressures using first-principle calculations. The binding energy and band structure have been calculated for chair (C-) and boat (B-) structures, which are having good stability at 0 GPa, 3 GPa, 6 GPa, 9 GPa, 12 GPa, 15 GPa, and...

The structural, electronic, and optical properties of fluorinated graphene under different hydrostatic pressures and thermodynamic properties under different temperatures have been studied using first-principle calculations. The calculated binding energy and phonon dispersion show that the fluorinated graphene is stable up to 90 GPa external pressu...

The structural, electronic, and optical properties of hydrogenated silicene have been studied under different hydrostatic pressures using first-principle calculations. The binding energy and band structure have been calculated for Chair (C-) and Boat (B-) structures, which are having good stability at 0 GPa, 3 GPa, 6 GPa, 9 GPa, 12 GPa, 15 GPa, and...

The structural, electronic, and optical properties of hydrofluorinated germanene have been studied with different occupancy ratios of fluorine and hydrogen. The hybridization of H-1 s and Ge-4p orbitals in hydrogenated germanene and F-2p and Ge-4p orbitals in fluorinated germanene plays a significant role in creating an energy bandgap. The binding...

The structural, electronic, and optical properties of hydrogenated silicene have been studied under different pressures using first-principle calculations. The binding energy and band structure have been calculated for two stable structures: Chair (C-) and Boat (B-) in the range of 0–21 GPa external pressure. The behavior of stability and energy ba...

The structural, electronic, and optical properties of hydrofluorinated germanene have been studied with different occupancy ratios of fluorine and hydrogen. The hybridization of H-1s and Ge-4p orbitals in hydrogenated germanene and F-2p and Ge-4p orbitals in fluorinated germanene plays a significant role in creating an energy bandgap. The binding e...

First-principle calculations are performed to study the structural, electronic, optical and thermodynamic properties of hydrogenated germanene (germanane) for most stable chair (C-), boat (B-) and tricycle (T-) structures. The band structure is studied under different hydrostatic pressures. The germanane shows metallic behavior at 30 GPa, 25 GPa an...

The electronic and elastic properties of AIIB2IIIC 4VI defect-chalcopyrite semiconductors have been studied using first-principle density functional theory (DFT) calculations. The lattice constants, energy band gap, elastic stiffness constants, bulk modulus, shear modulus, shear anisotropy factor, Young’s modulus, Debye temperature, Poisson’s ratio...

In this study, we report the effect of Zr/Sn ratio on the Antiferroelectric (AFE) → Ferroelectric (FE) phase transition and transverse piezoelectric characteristics on AFE thin films of compositions having the general formula Pb 0.97 La 0.02 (Zr 1- x + y Sn x Ti y )O 3 , where y = 0.10 and 0.10 ≤ x ≤ 0.15 along the phase boundary in the ternary sys...

First-principle calculations are performed to study the structural, electronic, and optical properties of chair-structured hydrogenated graphene (C-graphane) under different hydrostatic pressures. The lattice constants, bond lengths, bond angles, energy band gap, and binding energy are calculated in the pressure range of 0–300 GPa. The results show...

The structural, electronic, optical, and thermodynamic properties of hydrochlorinated Janus graphene (J-GN) have been studied using first-principle DFT calculations. The band structure and density of states have been discussed. The values of 16 parameters have been calculated for the most stable chair (C) structure of hydrochlorinated J-GN. Out of...

Excited states of the rubidium isotopes 3787, 89, 91Rb have been studied at the INFN Legnaro National Laboratory. Measurements of the \(\gamma\)-ray decay of fragments produced in binary grazing reactions resulting from the interaction of a beam of 530 MeV ⁹⁶Zr ions with a ¹²⁴Sn target have been complemented by studies of the \(\gamma\)-ray decay o...

Preferentially {110}-oriented thin films of lead lanthanum zirconate titanate, (Pb, La) (Zr, Ti)O3 [PLZT] having compositions (7/65/35), (7/60/40) and (7/56/44) across the morphotropic phase boundary with a thickness of 1.5µm were prepared on platinised silicon substrates (111) Pt/Ti/SiO2/Si by sol-gel spin coating technique. The crystallographic o...

An Infrared Free Electron Laser (IR-FEL) designed to operate in the 12.5-50 μm wavelength band is presently in an advanced stage of commissioning at the Raja Ramanna Centre for Advanced Technology (RRCAT), Indore. Here we report results from first experiments on the IR-FEL after installation of its optical cavity, which has resulted in a power outp...

The structural, electronic, elastic and optical properties of LiGaS2 and LiGaSe2 orthorhombic crystals have been studied using local density approximation and general gradient approximation within first-principles density functional theory calculations. The lattice constants, energy band gap, total density of states and partial density of states ha...

First-principle calculations of the structural, electronic, optical and thermal properties of hydrogenated graphene have been performed for three stable structures: chair, boat and tricycle using the plane wave Pseudo-potential method within density functional theory (DFT). The band structure and density of states have been studied. The values of 1...

The plane wave pseudo-potential method within density functional theory has been used to calculate the structural and elastic properties of AIBIIIC2VI semiconductors. The electronic band structure, density of states, lattice constants (a and c), internal parameter (u), tetragonal distortion (η), energy gap (Eg), and bond lengths of the A–C (dAC) an...

Based on plasma oscillations theory of solids, simple relations have been proposed for the calculation of bond length, specific gravity, homopolar energy gap, heteropolar energy gap, average energy gap, crystal ionicity, bulk modulus, electronic polarizability and dielectric constant of rare earth divalent R⁺²X and trivalent R⁺³X monochalcogenides....

First-principle calculations are performed to calculate the values of dielectric constant, refractive index, and energy-loss spectra for LiInTe2 semiconductor at different pressures. The calculated values are compared with available experimental and reported values. A fairly good agreement has been obtained between them.

The optical, elastic and thermal properties of zincblende aluminium nitride have been studied. The refractive index, absorption coefficient, reflectivity, dielectric constant, extinction coefficient, and energy-loss spectrum have been calculated using the pseudo-potential method under density functional theory at different pressures. The heat capac...

Superior piezoelectric properties of lead-based perovskite type solid solution systems such as PLZT, having compositions near morphotropic phase boundary (MPB) make them ideal candidates for MEMS. The dielectric and piezoelectric characteristics in such perovskite based thin films are related to their structure and texture. In this study, we report...

Objective: Withania somnifera is an important Ayurvedic medicinal plant oftenly used for prevention and cure of diabetes and its comorbid disorders. This study was designed to experimentally evaluate the potential effect of Withania somnifera on cholinergic activity in diabetic rats. Methods: Groups of streptozotocin administered diabetic rats wer...

The neutron-rich S39 nucleus has been studied using binary grazing reactions produced by the interaction of a 215-MeV beam of S36 ions with a thin Pb208 target. The magnetic spectrometer, PRISMA, and the γ-ray array, CLARA, were used in the measurements. Gamma-ray transitions of the following energies were observed: 339, 398, 466, 705, 1517, 1656,...

{110}-preferentially oriented thin films of lead based perovskite solid solutions consisting of lead indium niobate (PIN) and lead titanate (PT), (1−x) PIN-x PT, x = 0.36–0.40 having compositions near the morphotropic phase boundary (MPB), and having a thickness of 2.0 μm, were prepared on silicon substrates (111)Pt/Ti/SiO2/Si by a chemical solutio...

Excited states of the neutron-rich N=21 S37 nucleus have been studied using binary grazing reactions produced by the interaction of a 215-MeV beam of S36 ions with a thin Pb208 target. The magnetic spectrometer, PRISMA, and the γ-ray array, CLARA, were used in the measurements. The level scheme of S37 was established to an excitation energy of 4196...

Aims: To compare analgesic and anti-inflammatory activities of aspirin and mono-hydroxybenzoic acids after their daily oral doses. Main methods: Efficacies of repeated daily stress response suppressing low oral doses (20mg/kg) of aspirin and 2-, 3-, and 4-hydroxybenzoic acids in mice hot plate test for centrally acting analgesics, and in acetic...

Simple models are proposed for the calculation of refractive index n and electronic polarizability α of AI BIII C2VI and AII BIV C2V groups of chalcopyrite semiconductors from their energy gap data. The values of n and α for 2 compounds of AI BIII C2VI family and 12 compounds of AII BIV C2V family are calculated for the first time in this work. The...

We have performed first-principle calculations to calculate elastic stiffness constants (C11, C12, C44) and bulk modulus (B) of AlN, GaN and InN semiconductors in the zinc blende structure. These properties are calculated using an ab initio pseudo potential method based on density functional theory (DFT) with the generalized gradient approximation...

The neutron-rich nuclei P34,35,36,37,38 were populated in binary grazing reactions initiated by a beam of S36 ions at 215 MeV incident on a thin Pb208 target. The combination of the PRISMA magnetic spectrometer and the CLARA array of escape-suppressed Ge detectors was used to detect γ rays in coincidence with projectile-like nuclear species. Furthe...

The design and performance analysis of a 1310/1550-nm wavelength division demultiplexer with tapered geometry based on InP/InGaAsP multimode interference (MMI) coupler has been carried out. Wavelength response of demultiplexer of conventional MMI and tapered input and tapered output (tapered I/O) waveguides geometry of the MMI have been discussed....

Elastic properties of elemental (C, Si, Ge), binary (II-VI, III-V) and ternary (I-III-VI2, II-IV-V2) semiconductors have been studied. New relations, based on plasma oscillation theory of solids, have been proposed for the calculation of bulk modulus (B), microhardness (H) and shear modulus (G) of these materials. The values of B, H, G and G/B rati...

Withania somnifera root is an important Ayurvedic Rasayana herb now often referred to as Indian ginseng. It is often used in traditionally known Ayurvedic formulations as an herbal adaptogen for promoting physical and mental health or for increasing longevity. Materials and Methods: Effects of a single and 5, 7, and 10 daily oral doses (10, 20 and...

In this paper, we have been studied the optical properties such as refractive index n(ω), absorption coefficient α(ω), and dielectric constant of wurtzite (WZ) GaN semiconductor using the plane-wave pseudopotential method within density functional theory (DFT). We have also been calculated the optical phonon modes using phonon calculation on Cambri...

Concentration dependence of the energy gap Eg(x) of In1-xGaxAs, InP1-xAsx, GaxAl1-xAs, GaPxAs1-x and AgGaxIn1-xSe2 alloy semiconductors, and temperature dependence of the energy gap Eg(T) of GaS, GaSe, GaTe, SnS and SnSe2 binary semiconductors have been studied. Both the concentration and temperature dependence of the energy gap Eg(x,T) AlxGa1-xN t...

Aim: To assess the efficacy of a Withania somnifera root extract (WSR) as a stress response-modulating agent with preventive potentials against obsessive compulsive disorders (OCD). Methodology: Groups of mice orally treated with 10, 20 or 40 mg/kg/day WSR, or with its vehicle, were subjected to a stress induced hyperthermia test on the 1st, 5th, 7...

______________________________________________________________________________ ABSTRACT The thermal behavior of pristine and γ-irradiated CR-39 polymer (upto a maximum dose of 1800 kGy) has been studied using Thermogrametric analysis. The changes in degradation activation energy, frequency factor, entropy of activation, free energy of decomposition...

Objective: Withania somnifera (Ashwagandha) is an important Rasayana herb and widely considered as Indian ginseng in Ayurveda. In traditional system of Indian medicine, it was used as tonic to promote physical and mental health, rejuvenate the body in debilitated conditions and increase longevity. Materials and Methods: The study was designed to c...

Objective: To validate the science behind the traditional use of Withania somnifera in Indian Ayurvedic system of medicine to treat anxiety, the study was designed to explore the protective effect of root extract of W. somnifera (WSR) against anxiety using rodent models. Materials and Methods: WSR was evaluated on two behavior models i.e. Stress i...

First-principles calculations were performed to study the elastic stiffness constants (C ij ) and Debye temperature (𝜃 D) of wurzite (wz) AlN and GaN binary semiconductors at high pressure. The lattice constants were calculated from the optimized structure of these materials. The band gaps were calculated at Γ point using local density approximatio...

The objective of the study was to evaluate for antidepressant like activity of a methanolic extract of B. juncea leaves (BJ 100, 200, and 400 mg/kg/day, po), and Imipramine (15 mg/kg/day, po) in alloxan monohydrate (120 mg/kg, ip) induced diabetic and nondiabetic rodents, using behavioural despair, learned helplessness, and tail suspension tests fo...

To study the structural and electronic properties of III-As (III:Ga, In) binary semiconductors, the total minimum energy of zinc blend GaAs and InAs cubic structure are calculated using local density approximation (LDA) with norm-conserving pseudopotential and the projector augmentation wave (PAW) pseudopotential to the density functional theory (D...

The structural, electronic, optical and elastic properties of ZnGeAs 2 semiconductor have been investigated using pseudopotential plane wave method within the density functional theory (DFT). The optimized lattice constants, energy gap and crystal field splitting parameter are calculated. The optical properties such as dielectric function, opt...

Linear properties of ternary chalcopyrite semiconductors have been studied. New relations based on plasma oscillations theory of solids have been proposed for calculation of homopolar, heteropolar and average energy gaps, dielectric constant and ionicity of A–C and B–C bonds in AIBIIIC 2VI and AIIBIVC 2V groups of semiconductors. The values of thes...

Metabolic effects of ten daily doses of standardized extract of Andrographis paniculata leaves (AP) rich in andrographolide were evaluated in a rat model of Type-2 diabetes and in diet induced obese rats. AP was administered per-orally as suspension in 0.3% carboxymethylcellulose at doses of 50, 100 and 200 mg/kg/day for 10 consecutive days. Blood...

The plane wave pseudo-potential method within density functional theory (DFT) has been used to investigate the structural, electronic, optical and elastic properties of ZnSiP2 chalcopyrite semiconductor. The lattice constants are calculated from the optimized unit cells and compare with the experimental value. The band structure, total density of s...

In field experiments in six districts of Haryana, best practice management (including zero tillage and 3-way split application of N-fertiliser) provided small (2%) improvements in grain yield when compared with local farmer practice. This best practice management also gave consistent improvement in chapatti quality as measured by grain hardness (11...

In field experiments in six districts of Haryana, best practice management (including zero tillage and 3-way split application of N-fertiliser) provided small (2%) improvements in grain yield when compared with local farmer practice. This best practice management also gave consistent improvement in chapatti quality as measured by grain hardness (11...

In field experiments in six districts of Haryana, best practice management (including zero tillage and 3-way split application of N-fertiliser) provided small (2%) improvements in grain yield when compared with local farmer practice. This best practice management also gave consistent improvement in chapatti quality as measured by grain hardness (11...

A Compact Ultrafast Terahertz Free Electron Laser based on a novel plane wave transformer (PWT) linear accelerator (linac) structure has been built at the Raja Ramanna Centre for Advanced Technology, Indore, and is presently undergoing commissioning. We report here a measured out-coupled terahertz (THz) radiation power more than 100 times higher th...

Using pseudo-potential plane wave method within the density functional theory the linear properties such as energy gap, lattice constants, dielectric function, optical reflectivity, refractive index, extinction coefficient, absorption spectra, refractive index and electron energy loss have been calculated for radiation up to 22 eV of ZnGeX2(X = P,A...

Neutron-rich chlorine isotopes were populated in the 40Ar+208Pb multiple transfer reaction via the −1p channels in a fragment-γ coincident measurement employing the Prisma-Clara setup. New γ transitions have been identified and, together with already available data, level schemes have been revised and compared with the results of large-scale sd-pf...

Results are reported from a search for the anomalous production of highly boosted Z bosons with large transverse momentum and decaying to . Such Z bosons may be produced in the decays of new heavy particles. The search uses pp collision data at , corresponding to an integrated luminosity of recorded with the CMS detector. The shape of the observed...

Introduction: Andrographis paniculata (Family: Acanthaceae) is also called ‘‘King of Bitters”. It is mentioned in Ayurveda for antidiabetic activity, and has been used as Chinese folk medicine for treatment of liver dysfunctions. Methods: Andrographis paniculata extract (AP) was chemically characterized to contain andrographolide (>30.0%, w/w) and...

The first measurement of vector-boson production associated with a top quark-antiquark pair in proton-proton collisions at √s=7 TeV is presented. The results are based on a data set corresponding to an integrated luminosity of 5.0 fb1, recorded by the CMS detector at the LHC in 2011. The measurement is performed in two independent channels through...

Here we have optimized the branching separation distance of Multimode interference splitter to overcome the power loss. We search the critical parameters like length and width of Multimode interference splitter and the branching separation between two output ports which give the maximum output field for the desired Wavelength. We also had seen the...

Brassica juncea is a polyphenols enriched edible plant, with diverse medicinal uses of different parts of which have been mentioned in the Ayurveda. The effects of 10 daily oral doses (100, 200, and 400 mg/kg/day) of a methanolic Brassica juncea leaf extract in rat models of anxiety using nondiabetic and alloxan-diabetic rats were quantified. In al...

The electronic, elastic and optical properties of zinc germanium phosphide, ZnGeP2, semiconductor have been studied using local density approximation (LDA) method within the density functional theory (DFT). The lattice constants (a and c), band structure, density of states (DOS), bulk modulus (B) and pressure derivative of bulk modulus (B′) have be...

Recently, there is a growing interest of research on the relationship of gut-microbiota and neurological disorders. Increasing number of findings suggests the broader role of gut-microbiota in the modulation of various physiological and pathological conditions and it is now well recognized that a bidirectional communication between brain and gut-mi...

Using the plasma oscillation theory of solids, simple relations have been proposed for the calculation of the homopolar (Eh), hctcropolar (Ec) and average energy (Eg) gaps, ionicity (/j) and dielectric constant (s) of II-VI (R,W, Zb), III-V (W, Zb) and I-VI1 (R) groups of materials with rocksalt (R), wurtzitc (W) and zincblcndc (Zb) structures from...

Recent experiments on the CUTE-FEL setup have shown more than 200 times enhancement in measured out-coupled THz radiation power as compared to the expected spontaneous emission for the beam parameters employed in the experiments. This is the first observed signature of build-up of coherence in the CUTE-FEL, which has been made possible by commissio...

Waveguide dispersion can be tailored but not the material dispersion. Hence the total dispersion can be shifted at any desired band by adjusting the waveguide dispersion. Waveguide dispersion is proportional to d2β/d2k and need to be computed numerically. In this paper we have tried to compute analytical expressions for d2β/d2k in terms of β for th...

Higher body mass index accompanied by hyperglycemia, hyperlipidemia and insulin insensitivity are the cardinal symptoms of diabesity, which is the spreading epidemic of the 21st century. Andrographis paniculata is a traditionally known medicinal plant often used in Indian and Chinese systems of medicine of for treatment of diabetes, and a few recen...

The second-order nonlinear optical (NLO) properties of ternary chalcopyrite semiconductors have been studied. The NLO tensor coefficients (d36) of the A-C and B-C bonds in AIBIIIC2VI semiconductors and their total contribution to whole family of these compounds have been calculated at 10.6 μm using plasma oscillations theory of solids. The calculat...

Background: Andrographis paniculata (Family: Acanthaceae) is also called ‘‘King of Bitters”. It grows abundantly in Southern and Southeastern Asia. It is mentioned in Ayurveda and has been used as Chinese folk medicine for centuries. Purpose: To evaluate Andrographis paniculata (AP) for its effect on central nervous system in rodents. Methods: AP w...

Customer relationship management (CRM) as a strategy and as a technology has gone through an amazing evolutionary journey. The initial technological approach has been followed by many disappointing initiatives only to see the maturing of the underlying concepts and applications in recent years. Today, CRM refers to a strategy, a set of tactics, and...

In this paper, an efficient Neuro-Fuzzy controller for attaining maximum power point tracking of PV systems is proposed. The efficiency of the proposed Neuro-Fuzzy controller is enhanced by an evolutionary algorithm. Here, an enhanced hill climbing algorithm is used for optimizing the PV array current and the respective output power. The converter...

Die-casting is one of the methods used to produce a large number of components with a good surface finish by injecting cast alloys into a metal mould under high pressure. The design of a die-casting die requires human expertise and is normally performed by trial and error, which leads to monetary and time losses. Automation at the initial die desig...

The Beam propagation method (BPM) is one of the most power techniques to investigate axially varying waveguides. The single mode optical Y-junction consisting of single mode channel waveguide is a fundamental component for dividing/combining guided light. Beam splitter/combiner sections are a basic element of many optical fiber communication system...

Design of a die casting die is a nontrivial task, which depends upon a number of influencing factors related to material, part geometry, manufacturing resources, cost, delivery time, etc. Complexity of this die design activity further increases in case of a multicavity die. Currently available die design systems lack in the level of automation and...

Microcrystalline cellulose II (MCCII) is a different allomorph of MCC that can be used as a filler and a disintegrant for direct compression. MCCII was studied as new pelletization aid with the aim to prepare pellets with a faster drug release than MCCI-based pellets. MCCII-based pellets showed an immediate diphenydramine center dot HCl release pro...