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Structural, vibrational, optical, photoluminescence, thermal,dielectric, and mechanical studies on zinc(tris) thiourea sulfate single crystal: A noticeable effect of organic dye

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Chinese Physics b 2018年第5期27卷 304-312页

作者： Mohd Shkir V ganesh S AlFaify I S Yahia Mohd Anis Advanced Functional Materials & Optoelectronic laboratory Department of PhysicsFaculty of ScienceKing Khalid University Department of Physics Sant Gadge Baba Amravati University

In this work, uranine-dyed zinc（tris） thiourea sulfate（ZTS） monocrystals, 26 mm×15 mm×10 mm in size, were synthesized by the solution method at ambient temperature. Their purity, crystallinity, lattice parameters, and functional modes were studied by x-ray diffraction, Fourier transform-infrared spectroscopy（FT-IR）, and FT-Raman spectroscopy analyses. The sodium ion content of the crystals from the dye was confirmed by elemental analysis. The diffused reflectance spectral analysis of the dyed crystal revealed a characteristic absorption band at 490 nm attributed to the presence of the dye. The calculated band gaps of the non-dyed and dyed crystals were 4.53 and 4.57 e V, respectively. A green emission peak at ～（512 ± 4） nm was observed in the photoluminescence spectrum of the uranine-dyed crystals. A differential scanning calorimetry study confirmed that the thermal stability improved owing to the addition of the dye. Dielectric and microhardness studies were conducted to examine the significant improvements in the corresponding properties of dyed crystals. The results demonstrated the competency of the dyed ZTS crystals for applications in optoelectronic devices.

关键词： crystal growth dielectric properties luminescence thermal properties mechanical properties

Dynamics of Entanglement in Qubit-Qutrit with x-Component of DM Interaction

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Communications in Theoretical Physics 2016年第3期65卷 278-284页

作者： Kapil K.Sharma S.N.pandey Department of Physics Motilal Nehru National Institute of Technology

In this present paper,we study the entanglement dynamics in qubit A-qutrit b pair under x component of Dzyaloshinshkii-Moriya interaction(D_x)by taking an auxiliary qubit ***,we consider an entangled qubit-qutrit pair initially prepared in two parameter qubit-qutrit states and one auxiliary qubit prepared in pure state interacts with the qutrit of the pair through DM *** trace away the auxiliary qubit and calculate the reduced dynamics in qubit A-qutrit b pair to study the influence of the state of auxiliary qubit C and D_x on *** find that the state(prob.b.lity amplitude)of auxiliary qubit does not influence the entanglement,only D_x influences the *** phenomenon of entanglement sudden death(ESD)induced by D_x has also been *** also present the affected and unaffected two parameter qubit-qutrit states by D_x.

关键词： entanglement dynamics qubit-qutrit DM interaction ESD

Structural, electronic, and mechanical properties of cubic TiO_2:A first-principles study

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Chinese Physics b 2018年第1期27卷 492-500页

作者： Debashish Dash Chandan K pandey Saurabh Chaudhury Susanta K Tripathy Department of Electrical Engineering National Institute of TechnologySilchar Assam Department of Electronics and Communication Engineering National Institute of TechnologySilchar Assam

We present an analysis of structural, electronic, and mechanical properties of cubic titanium dioxide （TiO2） using an all electron orthogonalzed linear combinations of atomic orbitals （OlCAO） basis set under the framework of density functional theory （DFT）. The structural property, especially the lattice constant a, and the electronic properties such as the band diagram and density of states （DOS） are studied and analyzed. The mechanical properties such as bulk moduli, shear moduli, Young＇s Moduli, and Poison＇s ratio are also investigated thoroughly. The calculations are carried out on shear moduli and anisotropy factor for cubic TiO2. The Vickers hardness is also tested for fluorite and pyrite cubic-structured TiO2. Furthermore, the results are compared with the previous theoretical and experimental results. It is found that DFT- based simulation produces results which are approximation to experimental results, whereas the calculated elastic constants are better than the previous theoretical and experimental values.

关键词： density functional theory cubic TiO2 structural electronic and mechanical properties

ON APPROXIMATE EFFICIENCY FOR NONSMOOTH RObUST VECTOR OPTIMIZATION PROblEMS

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Acta Mathematica Scientia 2020年第3期40卷 887-902页

作者： Tadeusz ANTCZAK Yogendra pandey Vinay SINGH Shashi Kant MISHRA Faculty of Mathematics and Computer Science University of LódźBanacha 2290-238 LódźPoland Department of Mathematics Satish Chandra CollegeBallia 277001India Department of Mathematics National Institute of TechnologyAizawl-796012MizoramIndia Department of Mathematics Banaras Hindu UniversityVaranasi-221005India

In this article,we use the robust optimization approach(also called the worst-case approach)for findingε-efficient solutions of the robust multiobjective optimization problem defined as a robust(worst-case)counterpart for the considered nonsmooth multiobjective programming problem with the uncertainty in both the objective and constraint ***,we establish both necessary and sufficient optimality conditions for a feasible solution to be anε-efficient solution(an approximate efficient solution)of the considered robust multiobjective optimization *** also use a scalarizing method in proving these optimality conditions.

关键词： Robust optimization approach robust multiobjective optimization ε-efficient solution ε-optimality conditions scalarization

Numerical solution of micropolar fluid flow via stretchable surface with chemical reaction and melting heat transfer using Keller-box method

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Propulsion and Power Research 2021年第2期10卷 194-207页

作者： Khilap Singh Alok Kumar pandey Manoj Kumar Department of Mathematics Statistics and Computer ScienceG.B.Pant University of Agriculture and TechnologyPantnagarUttarakhand263145India Department of Mathematics Graphic Era Deemed to be UniversityDehradunUttarakhand248002India

The main theme of this research is to find the numerical results of stagnation point flow of micropolar fluid over a porous stretchable surface due to the physical effects of internal heat generation/absorption,melting heat transfer and chemical reaction via Keller-box method(KbM).The graphs and tables are depicted and explained for various embedded *** range of melting heat transfer parameter is 0≤M≤3,the range of chemical reaction parameter is 0≤K_(r)≤1 whereas the values of space-temperature dependent heat source/sink parameters lies in-0:4≤Q≤0:4 and-2≤Q*≤*** upshots of the current problem illustrate that at fluid-solid interface,rate of HMT(heat and mass transfer)declined on escalating the values of stretching ***,as the values of internal heat source/sink parameter increases,heat transfer rate declines at fluid-solid interface.

关键词： Chemical reaction Implicit finite difference Keller-box method(KbM) Internal heat generation/absorption Heat and mass transfer(HMT) Melting heat transfer Porous medium

Role of baicalin as a potential therapeutic agent in hepatobiliary and gastrointestinal disorders:A review

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World Journal of Gastroenterology 2022年第26期28卷 3047-3062页

作者： Risha Ganguly Ashutosh Gupta Abhay K pandey Department of biochemistry University of AllahabadAllahabad(Prayagraj)211002Uttar PradeshIndia

baicalin is a natural bioactive compound derived from Scutellaria baicalensis,which is extensively used in traditional Chinese medicine.A literature survey demonstrated the broad spectrum of health benefits of baicalin such as antioxidant,anticancer,anti-inflammatory,antimicrobial,cardio-protective,hepatoprotective,renal protective,and neuroprotective *** is hydrolyzed to its metabolite baicalein by the action of gut microbiota,which is further reconverted to baicalin via phase 2 metabolism in the *** studies have suggested that baicalin exhibits therapeutic potential against several types of hepatic disorders including hepatic fibrosis,xenobiotic-induced liver injury,fatty liver disease,viral hepatitis,cholestasis,ulcerative colitis,hepatocellular and colorectal *** in vitro and in vivo examinations,it has been observed that baicalin showed a protective role against liver and gut-associated abnormalities by modifying several signaling pathways such as nuclear factor-kappa b,transforming growth factor beta 1/SMAD3,sirtuin 1,p38/mitogen-activated protein kinase/Janus kinase,and calcium/calmodulin-dependent protein kinase kinaseβ/adenosine monophosphate-activated protein kinase/acetyl-coenzyme A carboxylase ***,baicalin also regulates the expression of fibrotic genes such as smooth muscle actin,connective tissue growth factor,β-catenin,and inflammatory cytokines such as interferon gamma,interleukin-6(Il-6),tumor necrosis factor-alpha,and Il-1β,and attenuates the production of apoptotic proteins such as caspase-3,caspase-9 and b-cell lymphoma ***,due to its low solubility and poor bioavailability,widespread therapeutic applications of baicalin still remain a *** review summarized the hepatic and gastrointestinal protective attributes of baicalin with an emphasis on the molecular mechanisms that regulate the interaction of baicalin with the gut microbiota.

关键词： baicalin biotransformation Gut microbiota Hepatobiliary and gastrointestinal disorders Signaling pathways

Chemical composition,antioxidant and antibacterial activities of essential oil and methanol extract of Artemisia vulgaris and Gaultheria fragrantissima collected from Nepal

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Asian Pacific Journal of Tropical Medicine 2017年第10期10卷 952-959页

作者： bishnu Prasad pandey Rupak Thapa Anil Upreti Department of Chemical Science and Engineering Kathmandu UniversityDhulikhelKavreNepal Department of biotechnology Kathmandu UniversityDhulikhelKavreNepal

Objective: To identify the chemical constituents and biological activities of essential oil and crude methanol extract of Artemisia vulgaris(***) and Gaultheria fragrantissima(***).Methods: Phytochemical screening, total phenolic and flavonoid content, antibacterial activities, anti-oxidant assay of the crude extract were carried out to identify the biological activities and phytonutrients present in the ***, the chemical constituents present in the essential oil and crude methanol extract were analyzed using gas chromatography mass spectroscopy and high performance liquid chromatography(HPlC) ***: Gas chromatography mass spectroscopy analysis of essential oil from the aerial part of *** revealed 24 different compounds in ***(11.29%), b-thujone(19.19%), chrysanthenone(4.48%), camphor(11.89%), borneol(4.44%) and germacrene D(8.42%) were the major ***, leaves of *** contained methyl salicylate(95%) and asarone(4.64%).Furthermore, methanol extract of leaves of *** and *** were found rich in the total flavonoids and phenolic *** analysis of the methanol extract of leaves *** revealed the presence of morin and luteolin, whereas rutin was found as a major flavonoids compound in the leaves of ***, methanol extract of the *** and *** showed the highest antioxidant and antibacterial properties compared to the essential ***: The HPlC analysis of the methanol extract of *** shows the presence of luteolin and morin, whereas *** reveals the presence of rutin and a glycosylated *** reveal that *** oil is the rich source of monoterpene and sesquiterpene ***, *** and *** are the rich source of the phenolic and flavonoids compounds and show good antioxidant and antibacterial activity.

关键词： Artemisia vulgaris Gaultheria fragrantissima Flavonoids Antioxidant HPlC Gas chromatography mass spectroscopy

Slip flow of micropolar fluid through a permeable wedge due to the effects of chemical reaction and heat source/sink with Hall and ionslip currents:an analytic approach

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Propulsion and Power Research 2020年第3期9卷 289-303页

作者： Khilap Singh Alok Kumar pandey Manoj Kumar Department of Mathematics Statisticsand Computer ScienceG.B.Pant University of Agriculture and TechnologyPantnagar263145UttarakhandIndia Department of Mathematics Graphic Era Deemed to Be UniversityDehradun248002UttarakhandIndia

This study focuses on the combined impact of heat source/sink and chemical reaction on slip flow of micropolar fluid through a permeable wedge in the existence of Hall and ion-slip *** governing highly non-lincar PDEs were altered into a set of non-linear coupled ODEs by using similarity *** transformation method(DTM)has been implemented in transformed ODEs *** comparison with previous literatures was performed and the data of this study was found to be in accordance with each *** analytical solutions for skin-friction coefficients(surface drag forces),Nussclt and Sherwood numbers are depicted through graphs and *** study of boundary layer flow over a wedge surface plays an imperative role in the field of aerodynamics,heat exchanger,ground water pollution and geothermal system etc.

关键词： Chemical reaction Differential transformation method(DTM) Hall current and ion slip Heat source/sink Micropolar fluid Slip velocity

Automatic detection of pulse morphology patterns &cardiac risks

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Journal of biomedical Science and Engineering 2012年第6期5卷 315-322页

作者： Rajani R. Joshi ganesh b. Nawsupe Smita P. Wangikar Departmemt of Electrical Engineering Indian Institute of Technology Bombay Mumbai India Departmemt of Mathematics Indian Institute of Technology Bombay Mumbai India Wesley Clover Communication Solutions Pune India

Analysis of arterial pulse waveforms is important for non-invasive diagnosis of cardiovascular functions. large samples of IPG signal records of radial arterial pulse show presence of eight different types of shapes (morphological patterns) in the pulse waveforms. In this paper we present an efficient computational method for automatic identification of these morphological patterns. Our algorithm uses likelihood ratio of cumulative periodogram of pulse signals and some geometrical criteria. The algorithm is presented with necessary details on signal processing aspects. Results for a large sample of pulse records of adult Indian subjects show high accuracy of our algorithm in detecting pulse-morphology patterns. Variation of pulse-morphology with respect to time is also analyzed using this algorithm. We have identified some characteristic features of pulse-morphology variation in patients of certain cardiac problems, hypertension, and diabetes. These are found relevant and significant in terms of physiological interpretation of the associated shapes of pulse waveforms. Importance of these findings is highlighted along with discussion on overall scope of our study in automatic analysis of heart rate variability and in other applications for non-invasive prognosis/diagnosis.

关键词： Pulse Signal Spectral Analysis—Fisher’s Ratio Morphology Variation Geometrical Modeling