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Mechanism of crustal extension in the Laxmi Basin,Arabian Sea

Geodesy and Geodynamics 2015年第6期6卷 409-422页

作者： pandey Anju pandey Dhananjai K ESSO-National centre for Antarctic and Ocean Research Ministry of Earth Sciences

continental rifting and magmatism has been extensively studied worldwide as it is believed that continental rifting, break up of continents and associated magmatism lead to genesis of new oceanic crust. However, various regions of the world show that these processes may lead to genesis of other types of crust than the oceanic crust. Laxmi Basin in the western continental margin of the India is one such region with an enigmatic *** to its extreme strategic significance for the palaeogeographic reconstruction of continents during cretaceous continental breakup of India, this basin has attracted various workers for more than two decades. However, still the issue of nature of crust in the basin remains controversial. In this contribution, in order to identify nature of crust, mechanism of continental extension in the Laxmi Basin has been studied for the first time through newly acquired seismic data from the basin. Here, we propose a plausible mechanism of crustal extension in the Laxmi Basin which eventually constrains the nature of crust of the Laxmi Basin. We have demonstrated that the crust in the Laxmi Basin can be categorised in two zones of stretched and transitional crust. In the stretched zone several fault bounded horst and graben structures are identified which preserve syn- and post-rift sediments along with different periods of hiatus in sedimentations as unconformities. These faults are identified as listric faults in the upper crust which sole out in the detachment *** faults decouples the upper brittle and lower ductile crust. The transitional crust is identified as heavily intruded by sills and basaltic volcanic which were emplaced due to melting of subcontinental mantle（ScM） after hyper-stretching of crust and serpentinisation of the ScM. Panikkar Ridge is proposed to be one such basaltic volcanic body derived from melting of lower part of the ScM.

关键词： Laxmi Basin Panikkar Ridge continental extension Mantle exhumation Detachment surface

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Structural and micro structural studies of PbO-doped SnO_2 sensor for detection of methanol, propanol and acetone

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journal of Natural Gas chemistry 2011年第2期20卷 179-183页

作者： j. K. Srivastava Preeti pandey V. N. Mishra R. Dwivedi center for Research in Microelectronics Department of Electronics Engineering Institute of Technology Banaras Hindu University

In the present work the structural information of PbO-doped SnO2 thick film sensor has been investigated with X-ray diffractometer （XRD） and scanning electron microscope （SEM）. Initially, SnO2 powder was derived using sol-gel process and was subsequently doped with PbO and ground up to nanosized particles. A suitable gas sensor structure was fabricated on 1′′×1′′ alumina substrate using thick film technology. The necessary paste for screen printing was also developed. SEM results showed sol-gel derived powder gets more agglomerated in the thick film form. The sensitivity of the sensor has been investigated at different temperatures （150 ？c？350 ？c） upon exposure to methanol, propanol and acetone, yielding a maximum at 250 ？c for acetone with 1 wt% PbO-doping while at 350 ？c for propanol with 3 wt% PbO-doping of the sensor. The reduction of particle size to nanometers （validated through XRD） leads to a dramatic improvement in sensitivity of sensors for the chosen organic vapors. The results also correlate well with the microstructural properties of the material and the dopant.

关键词： gas sensor nanosized SnO2 Sol-gel thick film

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cIPK9: a calcium sensor-interacting protein kinase required for low-potassium tolerance in Arabidopsis

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cell Research 2007年第5期17卷 411-421页

作者： Girdhar K pandey Yong Hwa cheong Beom-Gi Kim john j Grant Legong Li Department of Plant and Microbial Biology University of CaliforniaBerkeley CA 94720USA

Potassium is one of the major macro-nutrients essential for a number of cellular processes in plants. Low potassiumlevel in the soil represents a limiting factor for crop production. Recent studies have identified potassium transporters thatare involved in potassium acquisition, and some of them are critical for potassium nutrition under low potassium condi-tions. However, little is understood on the molecular components involved in low potassium signaling and responses. Wereport here the identification of a calcineurin B-like protein-interacting protein kinase （cIPK9） as a critical regulator oflow potassium response in Arabidopsis. The cIPK9 gene was responsive to abiotic stress conditions, and its transcriptwas inducible in both roots and shoots by potassium deprivation. Disruption of cIPK9 function rendered the mutantplants hypersensitive to low potassium media. Further analysis indicated that K+uptake and content were not affected inthe mutant plants, implying cIPK9 in the regulation of potassium utilization or sensing processes.

关键词： calcium calcineurin-B like protein protein kinase potassium nutrition signal transduction

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Towards sustainable agriculture:Harnessing AI for global food security

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Artificial Intelligence in Agriculture 2024年第2期12卷 72-84页

作者： Dhananjay K.pandey Richa Mishra Amity Institute of Biotechnology Amity University JharkhandRanchi 835303India IcFAI University JharkhandRanchi 835222India

The issue of food security continues to be a prominent global concern,affecting a significant number of individ-uals who experience the adverse effects of hunger and *** finding of a solution of this intricate issue necessitates the implementation of novel and paradigm-shifting methodologies in agriculture and food *** recent times,the domain of artificial intelligence(AI)has emerged as a potent tool capable of instigating a profound influence on the agriculture and food *** technologies provide significant advantages by opti-mizing crop cultivation practices,enabling the use of predictive modelling and precision agriculture techniques,and aiding efficient crop monitoring and disease ***,AI has the potential to optimize sup-ply chain operations,storage management,transportation systems,and quality assurance *** also tackles the problem of food loss and waste through post-harvest loss reduction,predictive analytics,and smart inventory *** study highlights that how by utilizing the power of AI,we could transform the way we produce,distribute,and manage food,ultimately creating a more secure and sustainable future for all.

关键词： Global food security Artificial intelligence crop improvement Food supply chain Sustainable resource management Food loss and waste

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Effects of Annealing Temperature on the Structural,Optical,and Electrical Properties of ZnO Thin Films Grown on n-Si<100>Substrates by the Sol–Gel Spin coating Method

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Acta Metallurgica Sinica(English Letters) 2014年第4期27卷 682-688页

作者： Aniruddh Bahadur Yadav Amritanshu pandey S.jit Department of Electronics Engineering Centre for Research in MicroelectronicsIndian Institute of Technology (Banaras Hindu University)

The effects of annealing temperature on the sol–gel-derived ZnO thin films deposited on n-Sh100 i substrates by sol–gel spin coating method have been studied in this *** structural,optical,and electrical properties of ZnO thin films annealed at 450,550,and 650 °c in the Ar gas atmosphere have been investigated in a systematic *** XRD analysis shows a polycrystalline nature of the films at all three annealing ***,the crystallite size is observed to be increased with the annealing temperature,whereas the positions of various peaks in the XRD spectra are found to be red-shifted with the *** surface morphology studied through the scanning electron microscopy measurements shows a uniform distribution of ZnO nanoparticles over the entire Si substrates of enhanced grain sizes with the annealing *** properties investigated by photoluminescence spectroscopy shows an optical band gap varying in the range of 3.28–3.15 eV as annealing temperature is increased from 450 to 650 °c,*** fourpoint probe measurement shows a decrease in resistivity from 2：1 10 2to 8：1 10 4X cm with the increased temperature from 450 to 650 °*** study could be useful for studying the sol–gel-derived ZnO thin film-based devices for various electronic,optoelectronic,and gas sensing applications.

关键词： Nanocrystalline ZnO thin film Sol–gel Annealing Surface morphology Photoluminescence(PL) Resistivity Grain size

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Microwave assisted synthesis,spectroscopy and biochemical aspects of lanthanum(Ⅲ) and praseodymium(Ⅲ) complexes with oxadiazole functionalised dithiocarbazinates

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journal of Rare Earths 2009年第5期27卷 698-704页

作者： Shweta Singh O P pandey S K Sengupta Department of chemistry D.D.U.Gorakhpur University chemistry Department University of Surrey

The new lanthanum (Ⅲ) and praseodymium (Ⅲ) complexes of the general formula [Ln(L)3] (Ln=La(Ⅲ) or Pr(Ⅲ); LK=potassium salt of dithiocarbazinates) were prepared by both, conventional thermal and by the use of microwave technology. Elemental analyses, electrical conductance, magnetic moment and electronic, infrared, far-infrared, 1H and 13c NMR spectral studies were used to characterize the complexes. The molecular weights of few complexes were determined by FAB-mass spectra. Nephelauxetic ratio, covalency parameter and bonding parameter for these complexes were also calculated. The probable structures of the complexes were proposed. The antifungal and antibacterial activities of the complexes were evaluated. The activities were correlated with the structures of the compounds.

关键词： lanthanum (Ⅲ) praseodymium (Ⅲ) dithiocarbazinates microwave synthesis structures antifungal antibacterial rare earths

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Microstructure studies of air-plasma-spray-deposited coNicrAlY coatings before and after thermal cyclic loading for high-temperature application

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International journal of Minerals,Metallurgy and Materials 2016年第8期23卷 934-942页

作者： Dipak Kumar K.N.pandey Dipak Kumar Das Mechanical Engineering Department Motilal Nehru National Institute of TechnologyAllahabad-211004India Defense Metallurgical Research Laboratory Hyderabad-500058India

In the present study, bond-coats for thermal barrier coatings were deposited via air plasma spraying（APS） techniques onto Inconel 800 and Hastelloy c-276 alloy substrates. Scanning electron microscopy（SEM）, transmission electron microscopy（TEM）, X-ray diffraction（XRD）, and atomic force microscopy（AFM） were used to investigate the phases and microstructure of the as-sprayed, APS-deposited co Ni cr Al Y bond-coatings. The aim of this work was to study the suitability of the bond-coat materials for high temperature applications. confirmation of nanoscale grains of the γ/γ′-phase was obtained by TEM, high-resolution TEM, and AFM. We concluded that these changes result from the plastic deformation of the bond-coat during the deposition, resulting in co Ni cr Al Y bond-coatings with excellent thermal cyclic resistance suitable for use in high-temperature applications. cyclic oxidative stability was observed to also depend on the underlying metallic alloy substrate.

关键词： thermal barrier coatings coating structure plasma spraying thermal cycle high-temperature applications microstructure studies

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Interaction of Heterotrimeric G-Protein components with Receptor-like Kinases in Plants： An Alternative to the Established Signaling Paradigm？

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Molecular Plant 2016年第8期9卷 1093-1095页

作者： Swarup Roy choudhury Sona pandey Donald Danforth Plant Science center St. Louis MO 63132 USA

Heterotrimeric G proteins comprising Ga, Gβ, and Gγ subunits （hereafter termed G proteins） mediate important signaling pro- cesses in all eukaryotes. As per the established paradigm,

关键词： hereafter Signal guanine

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Antiplasmodial activity of silver nanoparticles: A novel green synthesis approach

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Asian Pacific journal of Tropical Biomedicine 2018年第5期8卷 268-272页

作者： Madhur Sardana Varnika Agarwal Akansha Pant Vinita Kapoor Kailash c.pandey Sanjay Kumar Department of chemistry Sri Venkateswara College University of Delhi National Institute of Malaria Research ICMR Department of Biochemistry National Institute for Research in Environmental HealthICMR

Objective:To synthesize silver nanoparticles using silver nitrate by a green technique which involves different compositions of aqueous leaf extracts of Azadirachta indica(neem)and Ocimum sanctum(tulsi).Methods:Their shape and size were determined using transmission electron microscopy and UV-visible *** antiplasmodial activity was studied using the malarial parasite strain(Plasmodium falciparum,3D7).The parasite strain(3D7)was collected and revived in vitro using Trager and jensen method in RPMI 1640 medium for *** maximal effective concentration values were calculated by nonlinear regression ***:Transmission electron microscopy results confirmed the formation of silver nanoparticles with size ranging from 4.74-39.32 nm and their size differs by varying the concentrations from 20%to 100%of neem extract in neem and tulsi *** was observed that samples B and c showed half maximum effective concentration of about 0.3μ***:It can be easily established that the aqueous leaf extracts of neem and tulsi in combination can be a good source for synthesis of silver nanoparticles with small size possessing appreciable antiplasmodial activity.

关键词： Malaria Antiplasmodial activity Silver nanoparticles Green synthesis Azadirachta indica Ocimum sanctum

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Study of long term structural and functional changes in medically controlled glaucoma

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International journal of Ophthalmology(English edition) 2014年第1期7卷 128-132页

作者： Achyut N pandey S Sujata Department of Ophthalmology VCSG Medical College and Research InstituteSrinagar Garhwal joseph Eye Hospital

AIM: Prospectively analyze the long term structural and functional changes in patients of primary open angle glaucoma(POAG) receiving medical therapy(beta blockers and non beta blockers). In this study an attempt has been made to evaluate whether medical reduction of IOP prevents or delays the progression of glaucomatous visual field loss and/or optic nerve damage in patients with open angle glaucoma. · METHODS: Study conducted over a period of 27 months,at a tertiary eye care hospital including both eyes of 40 patients with POAG. Group 1(20 patients,40 eyes) received beta-blockers,and Group 2(20 patients,40 eyes) received non-beta-blockers. Each patient underwent intraocular pressure measurement,best corrected visual acuity,slit-lamp,fundus examination,gonioscopy,central corneal thickness,visual field assessment by Humphrey automated perimetry and retinal nerve fibre layer thickness by Stratus optical coherence tomography at baseline and at two subsequent visits. The average time interval between each visit was 10-11 months. The statistical analysis was done using one-way analysis of variance(ANOVA). Post-hoc test,using tukey’ method were adopted. Probablity(P) value of 0.05 or less was considered to be statistically significant. ·RESULTS: A total of 80 eyes of 40 patients of POAG were enrolled,24 males,16 females,age group 50-80 years. In both beta and non beta blocker group,reduction(improvement) in mean IOP from initial levels to the levels achieved at the 2nd and 3rd visits was statistically significant. One way ANOVA(df=2),fisher f value =11.64,P =0.000,one way ANOVA(df =3),fisher f value =35.61,P =0.000. Both mean deviation(MD) and pattern standard deviation(PSD) in both beta and nonbeta blockers at different visits were not statistically significant. Retinal nerve fibre layer thickness(RNFL)-only mean inferior retinal nerve fibre layer,the difference between the mean value in beta and non beta blocker groupwere statistically significant. [unpaired t test val

关键词： optical coherence tomography retinal nerve fibre layer mean deviation pattern standard deviation

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