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Eco-physiological studies on desert plants: germination of Halothamnus iraqensis Botsch. seeds under different conditions

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Journal of Arid Land 2019年第1期11卷 75-85页

作者： Arvind bhatT narayana r bhat Valentina MUrrU ANDrea SANTO Kuwait Institute for Scientific research University of Cagliari Independent researcher

With the aim to investigate if the halophyte Halothamnus iraqensis Botsch. can be suitable for re-vegetation and remediation of salt-affected lands, this study evaluated(1) the effects of photoperiod, thermoperiod, storage period and wings' presence on its seed germination, and(2) the ability of its seeds to have successful germination recovery after salt stress. Germination tests in different photoperiods(12 h light/12 h darkness and total darkness) and thermoperiods(15℃/20℃ and 20℃/25℃) were conducted for seeds collected in 2012, 2013, 2014, 2015 and 2016. The seeds collected in 2016 were sown under different salinity levels(0, 100, 200, 400 and 600 m M Na Cl) to assess the salinity tolerance during the germination. Wings' presence highly inhibited seed germination of this species in both photoperiods and thermoperiods under all salinity level treatments. In addition, the germination recovery occurred well when seeds were deprived of their wings. The photoperiod of 12 h light/12 h darkness and the thermoperiod of 15℃/20℃ were the best conditions for seed germination. Germination percentages of H. iraqensis seeds decreased with the increasing storage duration, especially after three years of the collection. In addition, H. iraqensis seeds were able to germinate under different salinity levels, and their germination percentages decreased with increasing salinity levels. H. iraqensis seeds have the ability to recover their germination after alleviating the salt stress, irrespective of photoperiod, highlighting the halophilous character of this species.

关键词： wings’ presence storage period photoperiod thermoperiod salt stress Halothamnus iraqensis Botsch

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Inter-population variabilities in seed mass and germination of Panicum turgidum and Pennisetum divisum in the desert of Kuwait

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Journal of Arid Land 2020年第1期12卷 144-153页

作者： Arvind bhatT narayana r bhat Afaf AL-NASSEr María M CArÓN AndreaSANTO Kuwait Institute for Scientific research Safat 24885Kuwait Laboratory of Botanical research(LABIBO) Faculty of Natural SciencesNational University of Salta-CONICETSalta 4400Argentina Independent researcher Selargius 09047Italy

Understanding variability in seed germination among populations is essential for planning an effective germplasm collection for restoration and conservation *** knowledge of germination and dormancy patterns among populations of desert grasses is crucial for determining the potential of the species and populations to be used for restoration and conservation as well as forage *** in seed germination of Panicum turgidum Forssk and Pennisetum divisum(Gmel.)*** the desert of Kuwait was evaluated in different populations in May *** of seed germination(25 seeds and 4 replicates)was conducted for each population at night/day temperatures of 15℃/20℃and 20℃/30℃under the following light condition:continuous darkness or 12 h/12 h light/*** showed that seed masses of both species strongly varied according to their seed provenances,and both species produced heavier seeds in population with a higher soil electrical *** germination percentage considerably varied between two species,and the variation in *** was greater(17%–49%)than that of ***(72%–93%).Germination percentage in *** was greater at high temperature(20℃/30℃)than at low temperature(15℃/20℃).However,temperature regimes had no effect on germination percentage of *** *** germination time of both species exhibited significant inter-population *** result is especially relevant to assure the selection of the best population of each species and the regeneration success of the *** this,inter-population variability also provides valuable information for enhancing our understanding of the mechanisms that regulate seed germination and how they might be related to seed provenance.

关键词： desert grass seed germination inter-population variability seed provenance seed dormancy

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Anomalous scaling of flexural phonon damping in nanoresonators with confined fluid

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Microsystems & Nanoengineering 2019年第1期5卷 682-694页

作者： Subhadeep De narayana r.Aluru Department of Mechanical Science and Engineering University of Illinois at Urbana-ChampaignUrbanaIL 61801USA Beckman Institute for Advanced Science and Technology University of Illinois at Urbana-ChampaignUrbanaIL 61801USA

Various one and two-dimensional(1D and 2D)nanomaterials and their combinations are emerging as next-generation sensors because of their unique opto-electro-mechanical properties accompanied by large surface-to-volume ratio and high quality *** numerous studies have demonstrated an unparalleled sensitivity of these materials as resonant nanomechanical sensors under vacuum isolation,an assessment of their performance in the presence of an interacting medium like fluid environment is ***,we report the mechanical damping behavior of a 1D singlewalled carbon nanotube(SWCNT)resonator operating in the fundamental flexural mode and interacting with a fluid environment,where the fluid is placed either inside or outside of the SWCNT.A scaling study of dissipation shows an anomalous behavior in case of interior fluid where the dissipation is found to be extremely low and scaling inversely with the fluid *** the sources of dissipation reveals that(i)the phonon dissipation remains unaltered with fluid density and(ii)the anomalous dissipation scaling in the fluid interior case is solely a characteristic of the fluid response under *** linear response theory,we construct a fluid damping kernel which characterizes the hydrodynamic force response due to the resonant *** damping kernel-based analysis shows that the unexpected behavior stems from time dependence of the hydrodynamic response under *** systematic dissipation analysis helps us to infer the origin of the intrinsic *** also emphasize on the difference in dissipative response of the fluid under nanoconfinement when compared to a fluid exterior *** finding highlights a unique feature of confined fluid–structure interaction and evaluates its effect on the performance of high-frequency nanoresonators.

关键词： scaling dissipation flexural

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Soret and Dufour effects on unsteady MHD flow past an infinite vertical porous plate with thermal radiation

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Applied Mathematics and Mechanics(English Edition) 2010年第12期31卷 1481-1496页

作者： S.r.VEMPATI A.B.LAXMI-narayana-GArI Department of Mathematics University College of ScienceOsmania University

The objective of the present study is to investigate the effect of flow parameters on the free convection and mass transfer of an unsteady magnetohydrodynamic flow of an electrically conducting, viscous, and incompressible fluid past an infinite vertical porous plate under oscillatory suction velocity and thermal radiation. The Dufour （diffusion thermo） and Soret （thermal diffusion） effects are taken into account. The problem is solved numerically using the finite element method for the velocity, the temperature, and the concentration field. The expression for the skin friction, the rate of heat and mass transfer is obtained. The results are presented numerically through graphs and tables for the externally cooled plate （Gr 〉 0） and the externally heated plate （Gr 〈 0） to observe the effects of various parameters encountered in the equations.

关键词： mass transfer magnetohydrodynamic flow vertical plate suction velocity,Soret and Dufour number thermal radiation finite element method

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Cloud-Based Software Development Lifecycle:A Simplified Algorithm for Cloud Service Provider Evaluation with Metric Analysis

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Big Data Mining and Analytics 2023年第2期6卷 127-138页

作者： Santhosh S narayana Swamy ramaiah Computer Science&Engineering Jain(Deemed-to-be University)Bangalore 562112India

At present,hundreds of cloud vendors in the global market provide various services based on a customer’s *** cloud vendors are not the same in terms of the number of services,infrastructure availability,security strategies,cost per customer,and reputation in the ***,software developers and organizations face a dilemma when choosing a suitable cloud vendor for their developmental ***,there is a need to evaluate various cloud service providers(CSPs)and platforms before choosing a suitable *** existing solutions are either based on simulation tools as per the requirements or evaluated concerning the quality of service ***,they require more time to collect data,simulate and evaluate the *** proposed work compares various CSPs in terms of major metrics,such as establishment,services,infrastructure,tools,pricing models,market share,etc.,based on the comparison,parameter ranking,and weightage ***,the parameters are categorized depending on the priority *** weighted average is calculated for each CSP,after which the values are sorted in descending *** experimental results show the unbiased selection of CSPs based on the chosen *** proposed parameter-ranking priority level weightage(PrPLW)algorithm simplifies the selection of the best-suited cloud vendor in accordance with the requirements of software development.

关键词： cloud-based software development life cycle(SDLC) cloud evaluation parameter-ranking priority level weightage(PrPLW)algorithm cloud service providers software engineering

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Free Convective Nonaligned Non-Newtonian Flow with Non-linear Thermal radiation

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Communications in Theoretical Physics 2016年第12期65卷 687-693页

作者： S.rana r.Mehmood PV S.narayana N.S.Akbar Department of Mathematics Faculty of Natural Sciences HITEC University Taxila Cantt Pakistan Department of Mathematics VIT University Vellore India National University of Sciences and Technology (NUST) Islamabad 44000 Pakistan

The present study explores the free convective oblique Casson fluid over a stretching surface with non-linear thermal radiation effects. The governing physical problem is modelled and transformed into a set of coupled non-linear ordinary differential equations by suitable similarity transformation, which are solved numerically with the help of shooting method keeping the convergence control of 10^(-5) in computations. Influence of pertinent physical parameters on normal, tangential velocity profiles and temperature are expressed through graphs. Physical quantities of interest such as skin friction coefficients and local heat flux are investigated numerically.

关键词： oblique flow forced Convection non-linear thermal radiation Casson fluid

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resveratrol as an inductor of autophagy: is there a unique pathway of activation?

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Neural regeneration research 2021年第1期16卷 101-103页

作者： narayana Pineda-ramírez Penélope Aguilera Laboratorio de Patología Vascular Cerebral.Instituto Nacional de Neurología y Neurocirugía Manuel Velasco Suárez Ciudad de MéxicoMéxico

Autophagy is a process of cellular degradation for the removal of damaged components and eventual recycling of the resulting molecules that help to the maintenance of cellular *** this pathway,proteins with relatively long half-life and whole organelles(e.g.,mitochondria,peroxisomes,and ribosomes)are degraded in the cytoplasm for the continuous turnover of cellular structures to facilitate their ***,the beneficial effect of autophagy goes beyond cellular“cleaning”and resides to a large extent on its ability to recycle cell components back into the ***,autophagy is a fundamental mechanism to regulate cellular functions,including DNA repair,proliferation,differentiation,embryonic development,and the immune response.

关键词： homeostasis activation autophagy

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Complexo-titrimetric determination of mercury using hexahydropyrimidine-2-thione as a selective masking agent

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Chinese Journal of Chemistry 1992年第5期10卷 412-416页

作者： narayana B. KUCHINAD T. Girish GAJENDrAGAD M. r. Department of Studies in Chemistry Mangalore University Mangalagangothri 574 199 Karnataka State India Kuvempu University B.R. Project Shlmoga 577115 India

A simple, rapid, accurate and selective complexometric method is proposed for the determina- tion of mercury(Ⅱ). Mercury(Ⅱ) is first complexed with a known excess of EDTA and the surplus EDTA is back-titrated at pH 5. 0--6. 0 with lead nitrate, xylenol orange being used as indicator. Hexa- hydropyrimidine-2-thione (HPT) is then added to displace EDTA from the Hg-EDTA complex quan- titatively and the EDTA released is titrated with lead nitrate. reproducible and accurate results are obtained for 2--55 mg of mercury, with a relative error of less than 0. 5% and standard deviation of less than 0.04.

关键词： EDTA 络合试剂 Complexo-titrimetric determination of mercury using hexahydropyrimidine-2-thione as a selective masking agent Hg

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Experimental study on performance of passive and active solar stills in Indian coastal climatic condition

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Frontiers in Energy 2020年第1期14卷 105-113页

作者： r.LALITHA narayana V.rAMACHANDrA rAJU Department of Mechanical Engineering Jawaharlal Nehru Technological University(JNTUK)Kakinada533003India Department of Mechanical Engineering Rajiv Gandhi University of Knowledge TechnologiesNuzivid521201India

This present work is aimed to examine the effect of mass flow rate on distillate output and performance of a solar still in active *** experiments were conducted at the coastal town,Kakinada(16°93′N/83°33′E),Andhra Pradesh,India.A solar still with a 30°of fixed cover inclination,1 m2 of effective basin area,and a flat-plate collector(FPC)with an effective area of 2 m2 were *** attempt was also made earlier in passive mode to optimize the water depth for the same solar still for maximum yield and distillation *** the passive still,it is observed that the capacity of heat storage and heat drop are significant parameters that affect the still *** the selected still design,the study reveals that 0.04 m water depth is the optimum value for specific climatic *** the active solar still,with the optimum water depth,different flow rates of 0.5,1 and 1.5 L/min are considered through *** is observed that both the mass flow rate and the variation of internal heat transfer coefficients with the mass flow rate have a significant effect on the yield and performance of the *** experimental results show that the combination of 1.5 L/min mass flow rate and an optimum water depth of 0.04 m leads to a maximum yield for the active solar *** enhanced yield of the active solar still is 57.55%,compared with that of the passive solar still,due to increase in area of radiation collection and more heat absorption rate.

关键词： distillation efficiency solar still heat transfer coefficient water depth optimum and mass flow rate

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Chevron-type graphene nanoribbons with a reduced energy band gap:Solution synthesis,scanning tunneling microscopy and electrical characterization

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Nano research 2020年第6期13卷 1713-1722页

作者： Ximeng Liu Gang Li Alexey Lipatov Tao Sun Mohammad Mehdi Pour narayana r.Aluru Joseph W.Lyding Alexander Sinitskii Beckman Institute for Advanced Science and Technology University of Illinois at Urbana-ChampaignUrbanaIL61801USA Department of Electrical and Computer Engineering University of Illinois at Urbana-ChampaignUrbanaIL61801USA Department of Chemistry University of Nebraska-LincolnLincolnNE68588USA Department of Mechanical Science and Engineering University of Illinois at Urbana-ChampaignUrbanaIL61801USA Nebraska Center for Materials and Nanoscience University of Nebraska-LincolnLincolnNE68588USA

Graphene nanoribbons(GNrs)attract a growing interest due to their tunable physical properties and promise for device applications.A variety of atomically precise GNrs have recently been synthesized by on-surface and solution *** on-surface GNrs can be conveniently visualized by scanning tunneling microscopy(STM),and their electronic structure can be probed by scanning tunneling spectroscopy(STS),such characterization remains a great challenge for the solution-synthesized ***,we report solution synthesis and detailed STM/STS characterization of atomically precise GNrs with a meandering shape that are structurally related to chevron GNrs but have a reduced energy band *** ribbons were synthesized by Ni0-mediated Yamamoto polymerization of specially designed molecular precursors using triflates as the leaving groups and oxidative cyclodehydrogenation of the resulting polymers using Scholl *** ribbons were deposited onto III-V semiconducting InAs(110)substrates by a dry contact transfer ***-resolution STM/STS characterization not only confirmed the GNr geometry,but also revealed details of electronic structure including energy states,electronic band gap,as well as the spatial distribution of the local density of *** experimental STS band gap of GNrs is about 2 eV,which is very close to 2.35 eV predicted by the density functional theory simulations with GW correction,indicating a weak screening effect of InAs(110)***,several aspects of GNr-InAs(110)substrate interactions were also probed and analyzed,including GNr tunable transparency,alignment to the substrate,and manipulations of GNr position by the STM *** weak interaction between the GNrs and the InAs(110)surface makes InAs(110)an ideal substrate for investigating the intrinsic properties of *** of the reduced energy band gap of these ribbons,the GNr thin films exhibit appreciably high electrical conductivity and on/off ratios of about 1

关键词： graphene nanoribbons bottom-up synthesis electronic structure dry contact transfer scanning tunneling microscopy scanning tunneling spectroscopy

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