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Investigation of magnetoelectric effect in lead free K0.5Na0.5NbO3–BaFe12O19 novel composite system

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Journal of Advanced Ceramics 2019年第3期8卷 333-344页

作者： Yogesh KUmAR KLYADAV Jyoti shah RKKOTNALA smart materials Research Laboratory Department of PhysicsIndian Institute of Technology RoorkeeRoorkee247667India National Physical Laboratory New DelhiDelhi110012India

Lead-free magnetoelectric composites(1-x)K0.5Na0.5NbO3–(x)BaFe12O19(x = 30, 40, and 50 wt%) are synthesized using solid state reaction method. X-ray diffraction(XRD) patterns confirm formation of diphase composites. Field emission scanning electron microscopy(FE-sEm) gives information about grain size, connectivity, and microstructure of constituent phases. Dielectric parameters of composite samples are studied as a function of temperature and the transition temperatures corresponding to both the constituent phases are observed in the composite samples. Dielectric constant has been found to decrease with addition of ferrite. Room temperature multiferroic behaviour has been confirmed using P–E and m–H hysteresis loops and magnetoelectric measurement. Polarization is found to decrease;however, magnetization increases with ferrite weight percentage. The highest αmE of 4.08 mV/(cm·Oe) is obtained for x = 30 wt% composite and it is realized that ferrite content significantly affects magnetoelectric behaviour.

关键词： composite materials X-ray diffraction(XRD) microstructure dielectric multiferroic

Reflection of thermoelastic wave on the interface of isotropic half-space and tetragonal syngony anisotropic medium of classes 4, 4/m with thermomechanical effect

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Chinese Physics B 2016年第3期25卷 414-417页

作者： Nurlybek A Ispulov Abdul Qadir m A shah Ainur K seythanova Tanat G Kissikov Erkin Arinov s. Toraygyrov Pavlodar state University Pavlodar 140008 Kazakhstan Department of Electrical Engineering Sukkur Institute of Business Administration Sindh Pakistan Zhezkazgan University Kazakhstan

The thermoelastic wave propagation in a tetragonal syngony anisotropic medium of classes 4, 4/m having heterogeneity along z axis has been investigated by employing matrizant method. This medium has an axis of second-order symmetry parallel to z axis. In the case of the fourth-order matrix coefficients, the problems of wave refraction and reflection on the interface of homogeneous anisotropic thermoelastic mediums are solved analytically.

关键词： anisotropic medium thermoelasticity harmonic waves dispersion

sOmE INTEGRAL mEAN EsTImATEs FOR POLYNOmIALs

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Analysis in Theory and Applications 2007年第2期23卷 101-111页

作者： A. Aziz W. m. shah University of Kashmir India Bemina College India

In this paper we establish L^q inequalities for polynomials, which in particular yields interesting generalizations of some Zygmund-type inequalities.

关键词： polynomial Bernstein's inequality L^q mean estimate zero

In vitro total phenolics,flavonoids contents and antioxidant activity of essential oil,various organic extracts from the leaves of tropical medicinal plant Tetrastigma from sabah

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Asian Pacific Journal of Tropical medicine 2011年第9期4卷 717-721页

作者： m Amzad Hossain muhammad Dawood shah Charles Gnanaraj muhammad Iqbal Biotechnology Research Institute Universili Malaysia Sabah.Licked Bag No.207388999 Kota KinabaluSabahMalaysia

Objective:To detect the in vitro total phenolics,flavonoids contents and antioxidant activity of essential oil,various organic extracts from the leaves of tropical medicinal plant Tetrastigma from ***:The dry powder leaves of Tetrastigma were extracted with different organic solvent such as *** acetate,chloroform,butanol and aqueous *** total phenolic and total flavonoids contents of the essential oil and various organic extracts such as hexane,ethyl acetate,chloroform,butanol and aqueous ethanol were determined by Folin-Ciocalteu method and the assayed antioxidant activity was determined in vitro models such as antioxidant capacity by radical scavenging activity usingα,α-diphenyl-β-picrylhydrazyl (DPPH) ***:The total phenolic contents of the essential oil and different extracts as gallic acid equivalents were found to be highest in methanol extract(386.22 mg/g) followed by ethyl acetate(190.89 mg/g).chloroform(175.89 mg/g).hexane(173.44 mg/g).and Imtanol extract (131.72 mg/g) and the phenolic contents not detected in essential *** antioxidant capacity of the essential oil and different extracts as ascorbic acid standard was in the order of methanol extract>ethyl acetate extract>chloroform>butanol>hexane extract also the antioxidant activity was not detected in essential ***:The findings show that the extent of antioxidant activity of the essential oil and all extracts are in accordance with the amount of phenolics present in that *** of Tetrastigma being rich in phenolics may provide a good source of antioxidant.

关键词： Total phenolics Flavonoids Antioxidant aotivity Essential oil Extracts Tetrastigma

Dielectric and conducting behavior of gadolinium–terbium fumarate heptahydrate crystals

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Journal of Advanced Dielectrics 2015年第3期5卷 19-26页

作者： m.D.shah B.Want solid state Research Laboratory Department of Physics University of KashmirSrinagar 190006India

Gadolinium-terbium fumarate heptahydrate crystals were grown in silica gel by using single gel diffusion *** crystals were characterized by different physico-chemical techniques of *** X-ray diffraction results showed that the grown material is purely crystalline in *** analyses suggested the chemical formula of the compound to be Gd Tb(C_(4)H_(2)O_(4)_(3)·7H_(2)*** dispersive X-ray analysis confirmed the presence of Gd and Tb in the title *** dielectric and conductivity studies of the grown compound were carried as function offrequency of applied field and the *** grown material showed a dielectric anomaly which was correlated with its thermal *** ac conductivity of the material showed Jonscher's power law behavior:σ(ω)=σ_(0)+Aω^(s),with a temperature-dependent power exponent s(s found to be a function of temperature and frequency.

关键词： single crystal growth characterization mixed rare earth compound ionic conductivity

Determination of lercanidipine in human plasma by an improved UPLC–ms/ms method for a bioequivalence study

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Journal of Pharmaceutical Analysis 2016年第2期6卷 87-94页

作者： Darshan V.Chaudhary Daxesh P.Patel Priyanka A.shah Jaivik V.shah mallika sanyal Pranav s.shrivastav Department of Chemistry School of Sciences Gujarat University Navrangpura Ahmedabad Gujarat 380009 India Laboratory of metabolism Center for Cancer Research National Cancer Institute National Institutes of Health Building 37 Room 3106 Bethesda MD 20892 USA Department of Chemistry St. Xavier's College Navrangpura Ahmedabad Gujarat 380009 India

An improved and reliable ultra-performance liquid chromatography/tandem mass spectrometry （UPLC- ms/ms） method has been developed and validated for the determination of lercanidipine in human plasma. Plasma samples with lercanidipine-d3 as an internal standard （Is） were prepared by solid phase extraction on Phenomenex strata-X cartridges using 100 μL of human plasma. Chromatographic analysis was performed on UPLC BEH C18 （50 mm × 2.1 mm, 1.7 μm） column under isocratic conditions. Linear calibration curves were obtained over a wide dynamic concentration range of 0.010-20.0 ng/mL. matrix effect was assessed by post-column infusion, post-extraction spiking and standard-line slope methods. The mean extraction recovery was 〉 94% for the analyte and Is. Inter-batch and intra-hatch precision （% CV） across five quality controls was 〈 5.8%. Bioequivalence study was performed with 36 healthy sub- jects after oral administration of 10 mg of lercanidipine and the assay reproducibility was evaluated by reanalysis of 133 incurred samples.

关键词： Lercanidipine UPLC-ms/ms Bioequivalence solid phase extraction Human plasma

Exploring the tectonostratigraphy of the Pakistan Himalaya with new detrital zircon geochronology and neodymium isotope data from the Kaghan Valley

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Geoscience Frontiers 2023年第6期14卷 117-132页

作者： W.Joel schiffer Delores m.Robinson shah Faisal Harold H.stowell Department of Geological sciences and Center for sedimentary Basin studies University of AlabamaPO Box 870338TuscaloosaAL 35487USA National Centre of Excellence in Geology University of PeshawarPeshawar 25130Pakistan

In the central Himalaya,the Greater and Lesser Himalayan tectonostratigraphic zones can be distinguished from each other by combining detrital zircon U-Pb ages and whole-rock Nd isotopic *** the Hazara-Kashmir syntaxis of northern Pakistan,rock units in the Kaghan valley have been variously assigned to the Tethyan,Greater,and Lesser Himalayan *** determine which tectonostratigraphic zones are represented,we sampled across the Batal thrust in the northern Kaghan valley because this structure is identified in some research as the main Central *** from the footwall yield Paleo-to mesoproterozoic maximum depositional ages(-1.8-1.1 Ga)and an averageεNd(0)value *** from the hanging wall yield Neoproterozoic maximum depositional ages(~1000-600 ma)andεNd(0)values *** contrasting detrital zircon ages show that the Batal thrust in the Kaghan valley is a major structural ***,these data lack the characteristic detrital zircon age spectra andεNd(0)values of Greater and Lesser Himalayan rocks north and south of the main Central thrust in the central Himalaya,***,either the Batal thrust is not the main Central thrust,or the main Central thrust in the Kaghan valley cuts a different structural level and carries rock units not seen outside the Hazara-Kashmir syntaxis.

关键词： Pakistan Himalaya Tectonostratigraphy main Central thrust Detrital zircon geochronology Neodymium isotopes

Exploring the impact of stratification on the dynamics of bioconvective thixotropic fluid conveying tiny particles and Cattaneo-Christov model:Thermal storage system application

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Propulsion and Power Research 2024年第3期13卷 416-432页

作者： T.Oreyeni m.D.shamshuddin A.m.Obalalu A.saeed Nehad Ali shah Department of Physical sciences Mathematics Programme UnitPrecious Cornerstone UniversityIbadanNigeria Department of Computer science and Artificial Intelligence(mathematics) SR UniversityWarangalTelangana State 506371India Department of mathematics Augustine University Ilara EpeLagosNigeria Center of Excellence in Theoretical and Computational science(TaCs-CoE) Faculty of ScienceKing Mongkut’s University of Technology Thonburi(KMUTT)126 Pracha Uthit Rd.BangModThung KhruBangkok 10140Thailand Department of mathematics and statistics College of ScienceImam Mohammad Ibn Saud Islamic University(IMSIU)Riyadh 11623Saudi Arabia

stratified thermal storage promotes energy sustainability by storing excess energy during times of low demand for later use making it possible to integrate renewable energy sources like solar and *** communication discusses the significance of triple stratifica-tion using the Cattaneo-Christov model in the bioconvectiveflow of thixotropicfluid coexisting with nanoparticles and gyrotactic *** Cattaneo-Christov heat and massflux is incorporated into thefluid model allowing more accurate prediction of heat and mass phenomena in thefluid *** governing partial differential equations that describefluidflow are parametrized to yield an ordinary differential equation system by adopting suitable *** series solutions are obtained by applying the homotopy analysis method(HAm).The effects of relevant parameters on the various profiles are revealed and accurately *** is observed that amplified thermal stratification lowers the temperature of ***,Brownian motion is used to illustrate the random movement of small particles suspended in liquids,and it is envisioned that the concentration distribution is significantly influenced by the Brownian motion of nanoparticles.

关键词： Cattaneo-Christov model stratification Bioconvection Nanofluid

Cooperative THz communication for UAVs in 6G and beyond

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Green Energy and Intelligent Transportation 2024年第1期3卷 25-31页

作者： Nazifa mustari muhammet Ali Karabulut A.F.m.shahen shah Ufuk Tureli Department of Electronics and Communication Engineering Yildiz Technical UniversityTurkey Department of Electrical Electronics Engineering Faculty of Engineering and ArchitectureKafkas UniversityKarsTurkey

One of the key components of any smart city is considered to be its intelligent transportation systems(ITss).Unmanned aerial vehicles(UAVs)are envisioned in several ITs application fields because of their autonomous operation,mobility,communication/processing capabilities,and other *** this paper,cooperative terahertz(THz)communication is proposed for flying ad hoc networks(FANETs),which is a particular kind of network made up of a collection of small UAVs linked in an ad hoc fashion and working together to accomplish high-level *** frequency spectrum for wireless communication has been expanding continuously in order to meet the demand for *** the forthcoming 6G and beyond,communications in the THz range will be vital,similar to how mmWave-band communications are currently influencing the 5G of wireless mobile *** finite state machine(Fsm)of the proposed cooperative communication system for THz band is presented.A markov chain model-based analytical study is carried out,which derives relationships among ***,numerical results are provided to support the analytical study.

关键词： Cooperative mAC THz UAVs 6G