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Spatial distribution of fossil fuel derived CO_(2) over India using radiocarbon measurements in crop plants

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Journal of Environmental Sciences 2023年第2期124卷 19-30页

作者： Rajveer Sharma ravi Kumar Kunchala Sunil Ojha Pankaj Kumar Satinath Gargari Sundeep Chopra Inter University Accelerator Centre New Delhi 110067India Centre for Atmospheric Sciences Indian Institute of Technology DelhiNew Delhi 110016India

Examining the contribution of fossil fuel CO_(2) to the total CO_(2) changes in the atmosphere is of primary concern due to its alarming levels of fossil fuel emissions over the globe,specifically developing *** radiocarbon represents an important observational constraint and utilized to trace fossil fuel derived CO_(2)(CO_(2ff))in the *** the first time,we have presented a detailed analysis on the spatial distribution of fossil fuel derived CO_(2)(CO_(2ff))over India using radiocarbon(Δ14C)measurements during three-year *** shows that theΔ14C values are varying between 29.33‰ to-34.06‰ across India in the year 2017,where highest value belongs to a location from Gujarat while lowest value belongs to a location from *** on the14C patterns,spatial distributions of CO_(2ff) mole fractions have been determined over India and the calculated values of CO_(2ff) mole fractions are varying between 4.85 ppm to 26.59 ppm across *** is also noticed that the highest CO_(2ff) mole fraction is observed as 26.59 ppm from a site in ***_(2ff) mole fraction values from four high altitude sites are found to be varied between 4.85 ppm to 14.87 *** of sampling different crop plants from the same growing season and different crop plant organs(grains,leaves,stems)on theΔ14C and CO_(2ff) have been *** and intra seasonal variations in theΔ14C and CO_(2ff) mole fractions have also been analyzed from a rural location(Dholpur,Rajasthan).

关键词： Carbon dioxide Crop plants Fossil fuel CO_(2) Radiocarbon measurements

Nonexistence and Existence of Multiple Positive Solutions for Superlinear Three-point Boundary Value Problems via Index Theory

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Acta Mathematicae Applicatae Sinica 2008年第4期24卷 529-540页

作者： Bao-qiang Yan Donal O'Regan ravi P. Agarwal Department of Mathematics Shandong Normal University Jinan 250014 China Department of Mathematics National University of Ireland Galway Ireland Department of Mathematical Science Florida Institute of Technology Melbourne Florida 32901 USA

This paper discusses both the nonexistence of positive solutions for second-order three-point boundary value problems when the nonlinear term f（t, x, y） is superlinear in y at y = 0 and the existence of multiple positive solutions for second-order three-point boundary value problems when the nonlinear term f（t, x,y） is superlinear in x at ＋∞.

关键词： Three-point boundary value problems cone fixed point index

Programmable protective device for LV distribution system protection

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Protection and Control of Modern Power Systems 2018年第1期3卷 294-299页

作者： S.Gopiya Naik Vibin ravi Ramya Arshiya Department of Electrical and Electronics Engineering PES College of EngineeringMandyaKarnatakaIndia

High quality electric power supply is the prime goal in the modern power systems around the *** of the main ways to achieve this is the protection of the system which needs to be fast,reliable and cost *** objective of this paper is to provide protection of equipments in low voltage(LV)distribution system and thereafter to avoid their failure due to abnormal operating *** proposed device provides protection for industrial,commercial and residential equipments by monitoring under voltage,over voltage and over current conditions using microcontroller,transistor and other discrete *** microcontroller is the heart of this protective device which performs the major control of the *** designed circuit can withstand the loads and the set voltage range so as to supply the connected load for any voltage variation between 220 and 240 *** can be used to protect loads such as refrigerator,TV,VCR/DVD player *** undesirable over and under voltage conditions as well as surges caused due to sudden failure of power supply *** device can also be used directly as standalone equipment between the supply mains and the *** over/under voltage and over current cut-off with time delay provides over/under-voltage and over current protection and also protection against any transients.

关键词： Distribution system Protective device Microcontroller Over-under voltage Over current

Can the grains offer each other helping hands?Convergent molecular mechanisms associated with domestication and crop improvement in rice and maize

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Molecular Plant 2022年第5期15卷 793-795页

作者： ravi V.Mural James C.Schnable University of Nebraska-Lincoln LincolnNEUSA

The grasses,Poaceae,are an extraordinarily ecologically success-ful clade,with more than 10000 described extant *** grasses include more than 30 domesticated grain crops,ranging from maize(Zea mays),rice(Oryza sativa),and wheat(Triticum aes-tivum),which are collectively responsible for 50%of all calories consumed by humans around the world,to minor and orphan crops such as teff(Eragrostis tef),pearl millet(Pennisetum glaucum),proso millet(Panicum milaceum),and Job's tears(Coix lacryma-jobi)(Glémin and Bataillon,2009).Domestication of grain crops from their wild relatives involved a common suite of phenotypic changes,including loss of seed shattering,loss of dormancy,and increased apical dominance,which are collectively referred to as"domestication syndrome"(Glémin and Bataillon,2009).

关键词： sativa crops collective

LC and LC–MS/MS studies for the identification and characterization of degradation products of acebutolol

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Journal of Pharmaceutical Analysis 2018年第6期8卷 357-365页

作者： Uday Rakibe ravi Tiwari Anand Mahajan Vipul Rane Pravin Wakte Department of Chemical Technology Dr.Babasaheb Ambedkar Marathwada University Department of Pharmaceutical Sciences SVKM's NMIMS Department of Pharmaceutical Analysis Goa College of Pharmacy

The aim of the present investigation was to demonstrate an approach involving use of liquid chromatography(LC) and liquid chromatography-mass spectrometry(LC–MS) to separate, identify and characterize very small quantities of degradation products(DPs) of acebutolol without their isolation from the reaction mixtures. The drug was subjected to oxidative, hydrolytic, thermal and photolytic stress conditions as per International Conference on Harmonization(ICH) guideline Q1 A(R2). Among all the stress conditions the drug was found to be labile in hydrolytic(acidic & basic) and photolytic stress conditions, while it was stable in water-induced hydrolysis, oxidative and thermal stress conditions. A total of four degradation products were formed. A C18 column was employed for the separation of all the DPs on a gradient mode by using high-performance liquid chromatography(HPLC). All the DPs were characterized with the help of their fragmentation pattern and the masses obtained upon LC–MS/MS and MSnanalysis. All the hitherto unknown degradation products were identified as 1-(2-(2-hydroxy-3-(isopropylamino)propoxy)-5-(amino)phenyl)ethanone(DP-I), N-(4-(2-hydroxy-3-(isopropylamino)propoxy)-3-acetylphenyl)acrylamide(DP-II), 1-(2-(2-hydroxy-3-(isopropylamino)propoxy)-5-(hydroxymethylamino)phenyl)ethanone(DP-III) and 1-(6-(2-hydroxy-3-(isopropylamino)propoxy)-2,3-dihydro-2-propylbenzo[d]oxazol-5-yl)ethanone(DP-IV). Finally the in-silico carcinogenicity and hepatotoxicity predictions of the drug and all the DPs were performed by using toxicity prediction softwares viz., TOPKAT, LAZAR and Discovery Studio ADMET. The results of in-silico toxicity studies revealed that acebutolol(0.967) and DP-I(0.986) were found to be carcinogenic, while acebutolol(0.490) and DP-IV(0.437) were found to be hepatotoxic.

关键词： Acebutolol Stress testing LC LC–MS/MS Degradation pathway In-silico toxicity

Solution of Modified Bergman Minimal Blood Glucose-Insulin Model Using Caputo-Fabrizio Fractional Derivative

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Computer Modeling in Engineering & Sciences 2021年第9期128卷 1247-1263页

作者： ravi Shanker Dubey Dumitru Baleanu Manvendra Narayan Mishra Pranay Goswami Department of Mathematics AMITY School of Applied ScienceAMITY University RajasthanJaipur302022India Department of Mathematics and Computer Sciences Cankaya UniversityBalgat06530Turkey Institute of Space Sciences Magurele-BucharestR76900Romania School of Liberal Studies Dr.B.R.Ambedkar University DelhiDelhi110006India

Diabetes is a burning issue in the whole *** is the imbalance between body glucose and *** study of this imbalance is very much needed from a research point of *** this reason,Bergman gave an important model named-Bergman *** the present work,using Caputo-Fabrizio(CF)fractional derivative,we generalize Bergman’s minimal blood glucose-insulin ***,we modify the old model by including one more component known as diet D(t),which is also essential for the blood glucose *** solve the modified modelwith the help of Sumudu transformand fixed-point iteration ***,using the fixed point theorem,we examine the existence and uniqueness of the results along with their numerical and graphical ***,the comparison between the values of parameters obtained by calculating different values of t with experimental data is also ***,we draw the graphs of G(t),X(t),I(t),andD(t)for different values ofτ.It is also clear from the obtained results and their graphical representation that the obtained results of modified Bergman’s minimal model are better than Bergman’s model.

关键词： Bergman minimal model blood glucose Caputo-Fabrizio fractional derivative uniqueness and existence fractional calculus

NON-INSTANTANEOUS IMPULSIVE FRACTIONAL DIFFERENTIAL EQUATIONS WITH STATE DEPENDENT DELAY AND PRACTICAL STABILITY

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Acta Mathematica Scientia 2021年第5期41卷 1699-1718页

作者： ravi AGARWAL Ricardo ALMEIDA Snezhana HRISTOVA Donal O'REGAN Department of Mathematics Texas A&M University-KingsvilleKingsvilleTX 78363USA Distinguished University Professor of Mathematics Florida Institute of TechnologyMelbourneFL 32901USA Center for Research and Development in Mathematics and Applications Department of MathematicsUniversity of AveiroPortugal Department of Applied Mathematics and Modeling University of Plovdiv Paisii HilendarskiPlovdivBulgaria School of Mathematics Statistics and Applied MathematicsNational University of IrelandGalwayIreland

Nonlinear delay Caputo fractional differential equations with non-instantaneous impulses are studied and we consider the general case of delay,depending on both the time and the state *** case when the lower limit of the Caputo fractional derivative is fixed at the initial time,and the case when the lower limit of the fractional derivative is changed at the end of each interval of action of the impulse are *** stability properties,based on the modified Razumikhin method are *** examples are given in this paper to illustrate the results.

关键词： non-instantaneous impulses Caputo fractional differential equations practical stability

Rigid body dynamics modeling, experimental characterization, and performance analysis of a howitzer

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Defence Technology（防务技术） 2016年第6期12卷 480-489页

作者： Nachiketa TIWARI Mukund PATIL ravi SHANKAR Abhishek SARASWAT Rituraj DWIVEDI Department of Mechanical Engineering Indian Institute of Technology Ordnance Factory Kanpur India

A large caliber howitzer is a complex and cumbersome assembly. Understanding its dynamics and performance attributes' sensitivity to changes in its design parameters can be a very time-consuming and expensive exercise, as such an effort requires highly sophisticated test rigs and platforms. However, the need of such an understanding is crucially important for system designers, users, and evaluators. Some of the key performance attributes of such a system are its vertical jump, forward motion, recoil displacement, and force transmitted to ground through tires and trail after the gun has been fired. In this work, we have developed a rigid body dynamics model for a representative howitzer system, and used relatively simple experimental procedures to estimate its principal design parameters. Such procedures can help in obviating the need of expensive experimental rigs, especially in early stages of the design cycle. These parameters were subsequently incorporated into our simulation model,which was then used to predict gun performance. Finally, we conducted several sensitivity studies to understand the influence of changes in various design parameters on system performance. Their results provide useful insights in our understanding of the functioning of the overall system.

关键词： Howitzer gun CAD modeling Dynamic simulation Recoil assembly parameters Sensitivity analysis

Differential fault location identification by machine learning

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CAAI Transactions on Intelligence Technology 2021年第1期6卷 17-24页

作者： Anubhab Baksi Santanu Sarkar Akhilesh Siddhanti ravi Anand Anupam Chattopadhyay Nanyang Technological University Singapore Indian Institute of Technology ChennaiIndia Georgia Institute of Technology AtlantaUSA Indian Institute of Technology KharagpurIndia

As the fault‐based attacks are becoming a more pertinent threat in today's era of edge computing/internet‐of‐things,there is a need to streamline the existing tools for better accuracy and ease of use,so that we can gauge the attacker's power and a proper countermeasure can be devised in the long *** this regard,we propose a machine learning(ML)assisted tool that can be used in the context of a differential fault *** particular,finding the exact fault location by analysing the output difference(typically the XOR of the nonfaulty and the faulty ciphertexts)is somewhat *** the literature survey,we notice that the Pearson's correlation coefficient dominantly is used for this purpose,and has almost become the defacto *** this method can yield good accuracy for certain cases,we argue that an MLbased method is more powerful in all the situations we experiment *** sub-stantiate our claim by showing the relative performances(we choose the commonly used multilayer perceptron as our ML tool)with two variants of Grain‐128a(a stream cipher,and a stream cipher with authentication),the lightweight stream cipher LIZARD and the lightweight block cipher SIMON‐32(where the faults are injected at the fifth last rounds).Our results demonstrate that a common ML tool can outperform the correlation with the same training/testing *** believe that our work extends the state‐of‐the‐art by showing how traditional cryptographic methods can be replaced by a more powerful ML tool.

关键词： fault typically gauge