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Fluid-driven Hydrovolcanic Activity along Fracture Zones and near Seamounts:Evidence from Deep-sea Fe-rich Spherules,Central Indian Ocean Basin

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Acta Geologica Sinica(English Edition) 2021年第5期95卷 1591-1603页

作者： Ankeeta AMONKAR Sridhar D.IYER Elapavalooru V.S.S.K.BABU Natarajan SHAILAJHA areef sardar S.MANJU CSIR-National Institute of Oceanography Dona PaulaGoa 403004India Marine Science School of EarthOcean and Atmospheric SciencesGoa UniversityGoa 403206India Formerly with CSIR-National Institute of Oceanography Dona PaulaGoa 403004India CSIR-National Geophysical Research Institute HyderabadTelangana 500007India Department of Earth Science Pondicherry UniversityPondicherry 605014India

An insight on occurrence of Fe-rich spherules from the Central Indian Ocean Basin(CIOB)provides an understanding of their distribution at a water depth of>5,000 *** the present study,Fe-rich spherules are identified to occur in two different sediment types(i.e.,siliceous and pelagic)and tectonic settings(*** seamounts and fracture zones).These are single spheres or aggregates,of different sizes(63 to 390μm)and show textural variability(smooth/quenched,brickwork,corkscrew,interlocking and dendritic).A comparative study based on physical morphology and chemical composition suggests a common mechanism of *** association of spherules with fracture zones(FZ)and seamounts signifies that morpho-tectonic features play an important role in fluid-driven *** on the evidence and geologic conditions existing in the basin,we conclude that molten fuel-coolant interaction(MFCI)coupled with submarine hydrothermal exhalations could be an ideal mechanism for the formation of spherules and *** accretion of the spherules on the surface sediments could be a result of recent volcanic phenomena,while those occurring at different depths(280-355,and 460-475 cm-bsf)within the sediment core indicate two different *** study provides a global implication in understanding fluid-driven magmatism in a deep-sea intraplate environment.

关键词： Fe-rich spherules deep-sea sediments hydrovolcanic activity CIOB

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Accumulation of Pb,Cu,and Zn in native plants growing on contaminated sites and their potential accumulation capacity in Heqing,Yunnan

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Journal of Environmental Sciences 2008年第12期20卷 1469-1474页

作者： sardar Khan Department of Soil Environmental Sciences Research Center for Eco-Environmental Sciences Department of Environmental Sciences University of Peshawar25120 Peshawar

Phytoremediation is one of the cost-effective and environmental friendly technologies used to remove contaminants from contaminated soils,which has been intensively studied during the last ***,few economical and effective remediation methods are available for the remediation of Pb contaminated *** study was conducted to assess the potential of 19 plants growing on contaminated sites in Pb mine *** and associated soil samples were collected and analyzed for total metal concentrati...

关键词： accumulation of Pb Cu and Zn cultivated crops accumulator lead mine remediation

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Confidential computing and related technologies:a critical review

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Cybersecurity 2023年第4期6卷 26-32页

作者： Muhammad Usama sardar Christof Fetzer Faculty of Computer Science Technische Universität DresdenDresdenGermany

This research critically reviews the definition of confidential computing(CC)and the security comparison of CC with other related technologies by the Confidential Computing Consortium(CCC).We demonstrate that the definitions by CCC are ambiguous,incomplete and even *** also demonstrate that the security comparison of CC with other technologies is neither scientific nor *** highlight the issues in the definitions and comparisons and provide initial recommendations for fixing the *** recommendations are the first step towards more precise definitions and reliable comparisons in the future.

关键词： Confidential Computing(CC) Trusted Execution Environment(TEE) Homomorphic Encryption(HE) Trusted Platform Module(TPM) Formal methods

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Identification and modelling of applicable wear conditions for stir cast Al-composite

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Friction 2020年第5期8卷 847-873页

作者： Santanu sardar Santanu Kumar KARMAKAR Debdulal DAS Department of Mechanical Engineering Indian Institute of Engineering Science and TechnologyHowrah 711103India Department of Metallurgy and Materials Engineering Indian Institute of Engineering Science and TechnologyHowrah 711103India

A comprehensive study of the tribological performance of the Al-Zn-Mg-Cu/Al2O3 composite and its matrix alloy is presented in this paper, with a specific emphasis to identify and model the applicable wear conditions where the composite provides a minimum of 50% reduction in wear rate and 25% lowering of the friction coefficient. Two-body abrasion experiments following Taguchi L27 orthogonal design have been performed separately on alloy and composite materials, both prepared by the stir casting method. The influence of crucial control factors including silicon carbide (SiC) abrasive size, load, sliding distance, and velocity on the percentage variations of wear rates and friction coefficients between alloy and composite have been studied using the analysis of variance technique and full quadratic regression method. The dominant control factors are identified as abrasive size, load, and the interaction between abrasive size and load. This has been verified by establishing the influence of abrasive size and load on variations of wear mechanisms like microcutting, microploughing, and delamination, identified by means of in-depth characterization of worn surfaces and generated debris for both alloy and composite. The selection of applicable tribological condition for the composite has been accomplished by adopting the multi-response optimization technique based on combined desirability approach to obtain concurrent optimization of the percentage variations of wear rates and friction coefficients. Predictive models correlating the superiority of tribological performance of composite with abrasion conditions have been developed, and these are found to be accurate (errors <10%), as determined by confirmatory experiment.

关键词： aluminum matrix composite tribology design of experiment Taguchi multi-response optimization abrasion mechanism

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KurdSet: A Kurdish Handwritten Characters Recognition Dataset Using Convolutional Neural Network

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Computers, Materials & Continua 2024年第4期79卷 429-448页

作者： sardar Hasen Ali Maiwan Bahjat Abdulrazzaq Computer Science Department University of ZakhoDuhokIraq

Handwritten character recognition(HCR)involves identifying characters in images,documents,and various sources such as forms surveys,questionnaires,and signatures,and transforming them into a machine-readable format for subsequent *** recognizing complex and intricately shaped handwritten characters remains a significant *** use of convolutional neural network(CNN)in recent developments has notably advanced HCR,leveraging the ability to extract discriminative features from extensive sets of raw *** of the absence of pre-existing datasets in the Kurdish language,we created a Kurdish handwritten dataset called(KurdSet).The dataset consists of Kurdish characters,digits,texts,and *** dataset consists of 1560 participants and contains 45,240 *** this study,we chose characters only from our *** utilized a Kurdish dataset for handwritten character *** study also utilizes various models,including InceptionV3,Xception,DenseNet121,and a *** show the performance of the KurdSet dataset,we compared it to Arabic handwritten character recognition dataset(AHCD).We applied the models to both datasets to show the performance of our ***,the performance of the models is evaluated using test accuracy,which measures the percentage of correctly classified characters in the evaluation *** models performed well in the training phase,DenseNet121 exhibited the highest accuracy among the models,achieving a high accuracy of 99.80%on the Kurdish *** Xception model achieved 98.66%using the Arabic dataset.

关键词： CNN models Kurdish handwritten recognition KurdSet dataset Arabic handwritten recognition DenseNet121 model InceptionV3 model Xception model

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Thermomechanical response of aluminum alloys under the combined action of tensile loading and laser irradiations

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Chinese Physics B 2018年第3期27卷 469-480页

作者： Mohsan Jelani Zewen Li Zhonghua Shen Maryam sardar School of Science Nanjing University of Science and Technology Nanjing 210094 China Advanced Launching Co-Innovation Centre Nanjing University of Science and Technology Nanjing 210094 China

This study reports the investigation of the thermomechanical behavior of aluminum alloys （AI-1060, A1-6061, and A1-7075） under the combined action of tensile loading and laser irradiations. The continuous wave ytterbium fiber laser （wavelength 1080 nm） was employed as the irradiation source, while tensile loading was provided by the tensile testing machine. The effects of various pre-loading and laser power densities on the failure time, temperature distribution, and the deformation behavior of aluminum alloys are analyzed. The experimental results represent the significant reduction in failure time for higher laser power densities and for high preloading values, which implies that preloading may contribute a significant role in the failure of the material at elevated temperature. Fracture on a microscopic scale was predominantly ductile comprising micro-void nucleation, growth, and coalescence. The AI-1060 specimens behaved plastically to some extent, while A1-6061 and A1-7075 specimens experienced catastrophic failure. The reason and characterization of ma- terial failure by tensile and laser loading are explored in detail. A comparative behavior of under-tested materials is also investigated. This work suggests that studies considering only combined loading are not enough to fully understand the mechanical behavior of under-tested materials. For complete characterization, one should consider the effect of heating as well as loading rate and the corresponding involved processes with the help of thermomechanical coupling and the thermal elastic-plastic theory.

关键词： aluminum alloys fiber laser tensile loading thermomechanical effects failure evolution

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A comprehensive physical insight about thermo physical aspects of Carreau fluid flow over a rotated disk of variable thickness by implementing finite difference approach

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Propulsion and Power Research 2022年第1期11卷 143-153页

作者： sardar Bilal Imtiaz Ali Shah Department of Mathematics AIR UniversityP.A.F ComplexSector E-9P.O.44000IslamabadPakistan

Present communication is devoted to analyze thermal characteristics of Carreau liquid flowing on variably thickened non-uniformly rotating *** formulation is constructed in view of complex coupled partial differential ***,boundary layer approach is executed for comprehensive examination of under consideration phenomenon with in boundary layer ***’s transformation is capitalized to convert the attained PDE’s into ordinary differential equations *** of attained ODE’s system is solved numerically by implementing Keller-Box *** of protuberant involved parameters on momentum and thermal distributions is illustrated through *** addition,impact of flow concerning parameters on wall shear stress and thermal flux is also *** assurance of present finding is done by making agreement with published results and by restricting considered problem to Newtonian ***,we observed that radially and tangentially directed wall drag lessen with growing magnitude of power law exponent ***,the consequence of disk thickness parameter grows stresses along radial direction whereas opposite behavior is depicted in case of tangentially directed friction and heat flux factors.

关键词： Carreau viscosity model Rotating disk Non-uniform thickness Keller-Box method

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Syntheses,Spectral Studies and Bioanalyses of Some Triorganotin(IV) Complexes of Cephlaxine

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Chinese Journal of Structural Chemistry 2008年第7期27卷 846-852页

作者： Wajid Rehman Bakhtiar Muhammad Farman Ali sardar Atif Department of Chemistry Hazara University MansehraPakistan

Five novel triorganotin（IV） complexes have been synthesized by refluxing trimethyl, triethyl, tributyl, triphenyl and tribenzyltin chloride with Cephlaxine. These compounds were characterized by spectroscopic （IR, IH, 13C, 119Sn NMR） techniques and elemental analysis. The results obtained through these techniques are in full agreement with the proposed 1：1 stoichiometry. The synthesized compounds were than tested against various microorganisms and fungi. The results of new products obtained showed that the triphenyltin（IV） complex displayed promising activity against all types of bacteria and fungi used while all other compounds showed significant antibacterial and antifungal activity.

关键词： cephlaxine spectra triorganotin activity bacteria

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DFT studies of thermoelectric properties of R-Au intermetallics at 300 K

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Journal of Rare Earths 2018年第2期36卷 197-202页

作者： sardar Ahmad Rashid Ahmad Muhammad Bilal Najeeb Ur Rehman Center for Computational Materials Science University of Malakand Department of Chemistry University of Malakand Department of Physics University of Malakand

Thermoelectric and electronic properties of cubic bi-intermetallics R-Au（R = Tb, Ho. Er. Tm and Yb）compounds were explored. Electronic properties i.e. density of states and band structure were computed using first principles calculations which proved the metallic nature of these compounds. Post-DFT（BoltzTraP） calculations were carried out to explore their thermoelectric properties like electrical conductivities. Seebeck coefficient, electronic thermal conductivities and figure of merit. The highest Seebeck coefficient and figure of merit were found for YbAu among these compounds which are 105 μV/K and 0.285 respectively. All the calculations were carried out at 300 K. Large values of figure of merit obtained for these compounds at room temperature indicate that these materials can be used for thermoelectric devices however need experimental verification.

关键词： DFT Seebeck coefficient Figure of merit Thermal conductivity Electrical conductivity R-Au

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A single-phase full-color phosphor Sr_(2)Ca_(2)La(PO_(4))_(3)O:Eu^(2+),Tb^(3+),Mn^(2+):Photoluminescence and energy transfer

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Journal of Rare Earths 2022年第4期40卷 541-550,I0002页

作者： Ju Cheng Xintian Bian Zhangyin Zhai Maryam sardar Jian Lu School of Physics and Electronic Electrical Engineering Huaiyin Normal UniversityHuai'an 223001China School of Science Nanjing University of Science and TechnologyNanjing 210094China

A single-phase full-color emitting phosphor Sr_(2)Ca_(2)La(PO_(4))_(3)O:Eu^(2+),Tb^(3+),Mn^(2+) was synthesized by the high temperature solid-state *** phase formation,luminescence properties,thermal stability,and energy transfer from Eu^(2+)to Tb^(3+) and Eu^(2+)to Mn^(2+) in Sr_(2)Ca_(2)La(PO_(4))_(3)O were investigated in *** emission color from blue to blueish green or orange can be observed under 365 nm near-ultraviolet excitation based on the energy transfer from Eu^(2+) to Tb^(3+)or Mn^(2+) ions by varying the ratio of Eu^(2+)/Tb^(3+)or Eu^(2+)/Mn^(2+) *** light was obtained with chromaticity coordinates of(0.3558,0.3500)in the Sr_(2)Ca_(2)La(PO_(4))_(3)O:0.04Eu^(2+),0.08Tb^(3+),0.40Mn^(2+) phosphor,suggesting their potential applications in white light emitting diodes.

关键词： Phosphors Energy transfer Photoluminescence properties White light-emitting diodes Rare earths

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