检索结果-南通市图书馆

Extensional collapse of the Gondwana orogen: Evidence from Cambrian mafic magmatism in the Trivandrum Block, southern India

在线全文

学校读者我要写书评

暂无评论

Geoscience Frontiers 2019年第1期10卷 263-284页

作者： Qiong-Yan Yang Sohini Ganguly E.Shaji Yunpeng Dong V.nanda-Kumar School of Earth Science and Resources China University of Geosciences Department of Earth Science Goa University Department of Geology University of Kerala State Key Laboratory of Continental Dynamics Department of Geology Northwest University National Center for Earth Science Studies Akkulam Trivandrum India

The assembly of Late Neoproterozoice Cambrian supercontinent Gondwana involved prolonged subduction and accretion generating arc magmatic and accretionary complexes, culminating in collision and formation of high grade metamorphic orogens. Here we report evidence for mafic magmatism associated with post-collisional extension from a suite of gabbroic rocks in the Trivandrum Block of southern Indian Gondwana fragment. Our petrological and geochemical data on these gabbroic suite show that they are analogous to high Fe tholeiitic basalts with evolution of the parental melts dominantly controlled by fractional crystallization. They display enrichment of LILE and LREE and depletion of HFSE with negative anomalies at Zre Hf and Ti corresponding to subduction zone magmatic regime. The tectonic affinity of the gabbros coupled with their geochemical features endorse a heterogeneous mantle source with collective melt contributions from sub-slab asthenospheric mantle upwelling through slab break-off and arc-related metasomatized mantle wedge, with magma emplacement in subduction to post-collisional intraplate settings. The high Nb contents and positive Nbe Ta anomalies of the rocks are attributed to inflow of asthenospheric melts containing ancient recycled subducted slab components and/or fusion of subducted slab materials owing to upwelling of hot asthenosphere. Zircon grains from the gabbros show magmatic crystallization texture with low U and Pb content. The LA-ICPMS analyses show ^(206) Pb/^(238) U mean ages in the range of 507-494 Ma suggesting Cambrian mafic magmatism. The post-collisional mafic magmatism identified in our study provides new insights into mantle dynamics during the waning stage of the birth of a supercontinent.

关键词： Mafic dykes Geochemistry Zircon Ue Pb geochronology Post-collisional extension Gondwana supercontinent

Enhanced photocatalytic degradation of 4-nitrophenol using polyacrylamide assisted Ce-doped YMnO_(3) nanoparticles

在线全文

学校读者我要写书评

暂无评论

Journal of Rare Earths 2023年第10期41卷 1541-1550,I0003页

作者： Bhagyashree Munisha Bindhyabasinee Mishra Jyotirmayee nanda Naresh K.Sahoo Debasis Ghosh K.J.Sankaran Shradha Suman Centre for Nano Science and Nano Technology ITERS’O’A Deemed to be UniversityKhandagiriBhubaneswar751030OdishaIndia Department of Physics ITERS’O’A Deemed to be UniversityKhandagiriBhubaneswar751030OdishaIndia Department of Chemistry ITERS’O’A Deemed to be UniversityKhandagiriBhubaneswar751030OdishaIndia Centre for Nano&Material Sciences JAIN(Deemed to be University)Jain Global CampusBangalore562112India CSIR-Institute of Minerals and Materials Technology BhubaneswarOdisha751013India

This research article mainly reports on the precise structural,optical,and photocatalytic properties of cerium(Ce)-substituted yttrium manganite(YMnO_(3))nanoparticles synthesized by the polyacrylamide gel *** characteristics of YMnO_(3)were investigated by the substitution of Ce into the Y site at various molar *** Raman and X-ray diffraction(XRD)analyses confirmed the pure phase of hexagonal YMnO_(3),supported by the Rietveld *** microstructural studies indicate inhomogeneous and irregular particle *** X-ray photoelectron spectroscopy(XPS)results show the presence of two ionic states of Mn and Ce along with Y^(3+)state and oxygen *** optical exploration using photoluminescence(PL)spectroscopy and UV-Vis-NIR analysis indicates that the intensity of absorption peak increases in the visible region,while the bandgap decreases from 1.42 to1.30 eV with the Ce ion doping(5 mol%-15 mol%).Photocatalytic properties of the polycrystalline nanoparticles were investigated by degradation of the pollutant *** process of amplified photocatalysis process was elucidated by the lowered bandgap and rate of charge carrier *** can be conjugated from this study that the synthesized nanoparticles may be employed as highly efficient(92.8%)visible light-triggered photocatalysts in a variety of real-world applications.

关键词： Yttrium manganite Ce-doping Structural Optical Photocatalysis Rare earths

Mitigating Carbon Emissions:A Comprehensive Analysis of Transitioning to Hydrogen-Powered Plants in Japan’s Energy Landscape Post-Fukushima

在线全文

学校读者我要写书评

暂无评论

Energy Engineering 2024年第5期121卷 1143-1159页

作者： Nugroho Agung Pambudi Andrew Chapman Alfan Sarifudin Desita Kamila Ulfa Iksan Riva nanda Department of Mechanical Engineering Education Universitas Sebelas MaretSukoharjo57161Indonesia International Institute for Carbon-Neutral Reserch(WPI-I2CNER) Kyushu UniversityFukuoka819-0395Japan Postgraduate of Mechanical Engineering Universitas Sebelas MaretSurakarta57126Indonesia Energy and Society Laboratory Department of Mechanical Engineering EducationUniversitas Sebelas MaretSukoharjo57161Indonesia Department of Metallurgical and Material Engineering Universitas IndonesiaDepok16424Indonesia

One of the impacts of the Fukushima disaster was the shutdown of all nuclear power plants in Japan,reaching zero production in *** response,the country started importing more fossil energy including coal,oil,and natural gas to fill the energy ***,this led to a significant increase in carbon emissions,hindering the efforts to reduce its carbon *** the current situation,Japan is actively working to balance its energy requirements with environmental considerations,including the utilization of hydrogen ***,this paper aims to explore the feasibility and implications of using hydrogen power plants as a means to reduce emissions,and this analysis will be conducted using the energy modeling of the MARKAL-TIMES Japan *** hydrogen scenario(HS)is assumed with the extensive integration of hydrogen into the power generation sector,supported by a hydrogen import ***,this scenario will be compared with the Business as Usual(BAU)*** results showed that the generation capacities of the BAU and HS scenarios have significantly different primary energy *** BAU scenario is highly dependent on fossil fuels,while the HS scenario integrates hydrogen contribution along with an increase in renewable energy,reaching a peak contribution of 2,160 PJ in *** the HS scenario,the target of reducing CO_(2) emissions by 80%is achieved through significant hydrogen *** 2050,the total CO_(2) emissions are estimated to be 939 million tons for the BAU scenario and 261 million tons for the Hydrogen *** addition,the contribution of hydrogen to electricity generation is expected to be 153 TWh,smaller than PV and wind power.

关键词： Business as usual(BAU)scenario hydrogen scenario CO_(2)emissions power generation sector

A Mixed-integer Linear Programming Model for Defining Customer Export Limit in PV-rich Low-voltage Distribution Networks

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Modern Power Systems and Clean Energy 2023年第1期11卷 191-200页

作者： Pedro P.Vergara Juan S.Giraldo Mauricio Salazar nanda K.Panda Phuong H.Nguyen Intelligent Electrical Power Grids(IEPG)Group Delft University of TechnologyDelft 2628CDThe Netherlands Energy Transition Studies Group Netherlands Organisation for Applied Scientific Research(TNO)Amsterdam1043 NTThe Netherlands Electrical Energy Systems(EES)Group Eindhoven University of TechnologyEindhovenThe Netherlands IEEE

A photovoltaic(PV)-rich low-voltage(LV)distribution network poses a limit on the export power of PVs due to the voltage magnitude *** defining a customer export limit,switching off the PV inverters can be avoided,and thus reducing power *** on this,this paper proposes a mixed-integer nonlinear programming(MINLP)model to define such optimal customer *** MINLP model aims to minimize the total PV power curtailment while considering the technical operation of the distribution ***,a nonlinear mathematical formulation is ***,a new set of linearizations approximating the Euclidean norm is introduced to turn the MINLP model into an MILP formulation that can be solved with reasonable computational *** extension to consider multiple stochastic scenarios is also *** proposed model has been tested in a real LV distribution network using smart meter measurements and irradiance profiles from a case study in the *** assess the quality of the solution provided by the proposed MILP model,Monte Carlo simulations are executed in OpenDSS,while an error assessment between the original MINLP and the approximated MILP model has been conducted.

关键词： Low-voltage distribution network photovoltaic(PV)curtailment optimal power flow Monte Carlo simulations

Optimization, equilibrium, adsorption behavior and role of surface functional groups on graphene oxide-based nanocomposite towards diclofenac drug

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2020年第7期32卷 137-150页

作者： Thuan Van Tran Duyen Thi Cam Nguyen Hanh TNLe Dai-Viet NVo Sonil nanda Trinh Duy Nguyen Nguyen Tat Thanh Hi-Tech Institute Nguyen Tat Thanh UniversityHo Chi Minh City 755414Viet Nam Center of Excellence for Green Energy and Environmental Nanomaterials(CE@GrEEN) Nguyen Tat Thanh UniversityHo Chi Minh City 755414Viet Nam Institute of Hygiene and Public Health Ho Chi Minh City 700000Viet Nam Department of Chemical and Biochemical Engineering University of Western OntarioLondonOntarioCanada

Aquatic contamination of diclofenac(DCF),an emergent non-steroidal anti-inflammatory drug(NSAIDs),can result in adverse effects to many ecosystems through ***,introducing effective remediation techniques to sequester the pharmaceutical wastes is highly fundamental to prevent their accumulation in the ***,adsorption has been presented as a green and efficient ***,we report the characterization and application of the novel magnetic nanocomposite(GO@CoFe2O4)derived from cobalt-based ferrite(CoFe2O4)and graphene oxide(GO)for DCF *** the optimization procedure,the response surface methodology(RSM)was adopted to investigate the impacts of DCF concentration(1.6-18.4 mg/L),DCF dosage(0.08-0.92 g/L),and solution pH(2.6-9.4)to find the optimum conditions for DCF removal,at 10.5 mg/L,0.74 g/L,and pH 4,*** the adsorption experiments,the kinetic,isotherm,thermodynamic,and intraparticle diffusion models were systematically ***,we have elucidated the role of functional groups on the surface of GO@CoFe2O4 in enhancing the adsorption of DCF *** good removal efficiency(up to 86.1%),high maximum adsorption capacity(32.4 mg/g),GO@CoFe2O4 can be a potential candidate to eliminate DCF drug from water.

关键词： Diclofenac sodium Graphene oxide Magnetic nanocomposite Response surface methodology Pharmaceuticals adsorption

Enhanced Energy Efficient with a Trust Aware in MANET for Real-Time Applications

在线全文

学校读者我要写书评

暂无评论

Computers, Materials & Continua 2023年第4期75卷 587-607页

作者： M.V.Narayana Vadla Pradeep Kumar Ashok Kumar nanda Hanumantha Rao Jalla Subba Reddy Chavva Department of CSE Guru Nanak Institutions Technical CampusHyderabadRanga Reddy DistrictTelangana501506India Department of CSE B V Raju Institute of TechnologyNarsapurMedakTelangana502313India Department of CSE T.R.R.Government Degree College KandukurKandukurA.P.523105India Department of IT VFST&Research(Deemed to be University)VadlamudiA.P.522213India

Mobile ad hoc networks (MANETs) are subjected to attack detectionfor transmitting and creating new messages or existing message *** attacker on another node evaluates the forging activity in themessage directly or indirectly. Every node sends short packets in a MANETenvironment with its identifier, location on the map, and time through *** attackers on the network broadcast the warning message usingfaked coordinates, providing the appearance of a network collision. Similarly,MANET degrades the channel utilization performance. Performancehighly affects network performance through security algorithms. This paperdeveloped a trust management technique called Enhanced Beacon TrustManagement with Hybrid Optimization (EBTM-Hyopt) for efficient clusterhead selection and malicious node detection. It tries to build trust amongconnected nodes and may improve security by requiring every participatingnode to develop and distribute genuine, accurate, and trustworthy materialacross the network. Specifically, optimized cluster head election is done periodicallyto reduce and balance the energy consumption to improve the lifetimenetwork. The cluster head election optimization is based on hybridizingParticle Swarm Optimization (PSO) and Gravitational Search OptimizationAlgorithm (GSOA) concepts to enable and ensure reliable routing. Simulationresults show that the proposed EBTM-HYOPT outperforms the state-of-thearttrust model in terms of 297.99 kbps of throughput, 46.34% of PDR, 13%of energy consumption, 165.6 kbps of packet loss, 67.49% of end-to-end delay,and 16.34% of packet length.

关键词： MANET malicious nodes clustering trust management beacon message

Determination of the time of refractive stability after uneventful phacoemulsification in Indian eyes

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

World Journal of Experimental Medicine 2024年第2期14卷 89-96页

作者： Ashok Kumar nanda Bijnya Birajita Panda Asish Swain Logesh Balakrishnan Department of Ophthalmology Kar Vision Eye HospitalBhubaneswar 751013OdishaIndia Department of Ophthalmology All India Institute of Medical SciencesBhubaneswar 751019OdishaIndia Department of Optometry Kar Vision Eye HospitalBhubaneswar 751013OdishaIndia Department of Statistics Apollo HospitalsChennai 823104India

BACKGROUND Knowledge about refractive stabilization and the accuracy of postoperative refractive error measurements are crucial for improved patient outcomes after *** guidelines typically recommend waiting 4-6 wk before prescribing corrective *** research focused on identifying factors that influence refractive errors in the early stages of post-cataract surgery,thus contributing to the existing literature on this *** To investigate the time required for refraction stability after uneventful phacoemulsification *** We compared the variation and statistical significance of the difference in spherical,cylindrical components,and the spherical equivalent between the 1-and 6-wk follow-up period in a group of 257 eyes that underwent uneventful phacoemulsification with foldable intraocular lens implantation,all performed by a single experienced *** Wilcoxon-Signed Rank Test was utilized to assess the magnitude of the change and determine its statistical *** refractive stability was defined as the point at which the change in spherical equivalent was within±0.5 dioptres for two consecutive *** The average age of the patients was 64.9±8.9 *** differences observed in both the visits in spherical power(0.1±0.2),cylinder power(0.3±0.4),and spherical equivalent(0.2±0.2)were minimal and not statistically *** majority of eyes(93.4%)achieved refractive stability within 6 wk after the *** cylindrical power differed between age groups at the 6th wk post-operative and the difference was statistically significant(P value 0.013).There were no significant differences in refractive stability when considering sex and axial *** Phacoemulsification with foldable intraocular lens implantation results in no significant changes in refraction for the majority of cases during the 6-wk follow-up ***,a spectacle prescription can be given at the completion of 1 wk.

关键词： Cataract surgery Phacoemulsification Refraction stability Visual acuity Spherical equivalent

Comparison of wear behaviour of LM13 Al−Si alloy based composites reinforced with synthetic(B_(4)C)and natural(ilmenite)ceramic particles

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Transactions of Nonferrous Metals Society of China 2021年第12期31卷 3613-3625页

作者： Rahul GUPTA Tarun nanda O.P.PANDEY Mechanical Engineering Department Thapar Institute of Engineering and TechnologyPatiala 147004PunjabIndia School of Physics and Materials Science Thapar Institute of Engineering and TechnologyPatiala 147004PunjabIndia

Dry sliding wear behaviour of stir-cast aluminium matrix composites(AMCs)containing LM13 alloy as matrix and ceramic particles as reinforcement was *** different ceramic particle reinforcements were used separately:synthetic ceramic particles(B_(4)C),and natural ceramic particles(ilmenite).Optical micrographs showed uniform dispersion of reinforced particles in the matrix *** particles refined the grain size of eutectic silicon and changed its morphology to globular type.B_(4)C reinforced composites(BRCs)showed maximum improvement in hardness of *** reinforced composites(IRCs)showed maximum reduction in coefficient of friction values due to strong matrix−reinforcement interfacial bonding caused by the formation of interfacial *** sliding wear behaviour of composites was significantly improved as compared to base *** low density and high hardness of B_(4)C particles resulted in high dislocation density around filler particles in *** the other hand,the low thermal conductivity of ilmenite particles resulted in early oxidation and formation of a tribo-layer on surface of ***,both types of reinforcements led to the improvement in wear properties of AMCs,though the mechanisms involved were very ***,the low-cost ilmenite particles can be used as alternative fillers to the high-cost B_(4)C particles for processing of wear resistant composites.

关键词： aluminium matrix composites ilmenite boron carbide particle-reinforcement wear test tribolayer XRD analysis SEM−EDS

Essential oils and its antibacterial,antifungal and anti-oxidant activity applications:A review

在线全文

学校读者我要写书评

暂无评论

Food Bioscience 2022年第3期47卷 145-160页

作者： Tianyu Hou Siva Sankar Sana Huizhen Li Yun Xing Anima nanda Vasudeva Reddy Netala Zhijun Zhang School of Chemical Engineering and Technology North University of ChinaTaiyuan030051China Jinzhong Institute of Industrial Technology and Innovation North University of ChinaJinzhong030600China Graduate School of Humanities Nagoya UniversityNagoya464-8601Japan Department of Biomedical Engineering Sathyabama Institute of Science and TechnologyChennaiTamilnaduIndia

Essential oils (EOs) seem to be more versatile and consist of a variety of volatile and organic biological active substances that are also employed as the better substitutes in the bacteria,fungal and various food *** researchers have done detailed research about the antibacterial property of essential oils and their respective *** several pioneering works in the past have explained the mode of action of some compounds,an extensive understanding of most of the substances and their molecular mechanisms is still *** particular,the bioactivity characteristics of EOs were evaluated by the main components found in *** components were commonly utilized in the applications of bactericidal,fungicidal,medicinal and antioxidant *** oils bioactivity can be contrasted with the behavior of pharmaceutical formulations which are produced ***,essential oils are showing promise organic extracts that require further analysis in the nutrition or pharmaceutical companies for potential applications as supplements,additives or *** of their diverse activities like antifungal and antibacterial characteristics,essential oils may be utilized as alternate additives to improve the grain and seed shelf *** review aims to provide a summary of existing information on the antibacterial and antifungal properties of EOs,their mechanism,and ingredients in identifying the areas of study that can promote the implementation in various bacterial and fungal properties.

关键词： Essential oils Terepnoids Antibacterial activity Antifungal activity Antioxidant activity