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Nanosphere molecularly imprinted polymers doped with gold nanoparticles for high selectivity molecular sensors

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Nano Research 2017年第3期10卷 1056-1063页

作者： Tehila Shahar tama Sicron Daniel Mandler Institute of Chemistry The Hebrew University of Jerusalem Jerusalem 9190401 Israel

We report the first attempt of using molecularly imprinted polymers （MIPs） in the shape of nanoparticles that were doped with gold nanoparticles （AuNPs） for surface enhanced Raman scattering （SERS）-based sensing of molecular spedes. Specifically, AuNPs doped molecularly imprinted nano-spheres （AuNPs@nanoMIPs） were synthesized by one-pot precipitation polymerization using Sudan IV as the template for the SERS sensing. The AuNPs@nanoMIPs were characterized by various modes of scanning transmission electron microscopy （STEM） that showed the exact location of the AuNPs inside the MIP particles. The effects of Au concentration and solution stirring on the shape and the polydispersity of the particles were studied. Significant enhancement of the Raman signals was observed only when the MIP particles were doped with the AuNPs. The SERS signal improved significantly with increase in the Au concentration inside the AuNPs@nanoMIPs. Selectivity measurements of the Sudan IV imprinted AuNPs@nanoMIPs carried out with different Sudan derivatives showed high selectivity of the AuNPs-doped MIP particles.

关键词： molecularly imprintedpolymers surface enhanced Ramanscattering (SERS) gold nanoparticles Sudan IV doping

A Stacking-Based Deep Neural Network Approach for Effective Network Anomaly Detection

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Computers, Materials & Continua 2021年第2期66卷 2217-2227页

作者： Lewis Nkenyereye Bayu Adhi tama Sunghoon Lim Department of Computer and Information Security Sejong UniversitySeoul05006Korea Data Science Group Institute for Basic Science(IBS)Daejeon34126Korea Department of Industrial Engineering Ulsan National Institute of Science and TechnologyUlsan44919Korea

An anomaly-based intrusion detection system(A-IDS)provides a critical aspect in a modern computing infrastructure since new types of attacks can be *** prevalently utilizes several machine learning algorithms(ML)for detecting and classifying network *** date,lots of algorithms have been proposed to improve the detection performance of A-IDS,either using individual or ensemble *** particular,ensemble learners have shown remarkable performance over individual learners in many applications,including in cybersecurity ***,most existing works still suffer from unsatisfactory results due to improper ensemble *** aim of this study is to emphasize the effectiveness of stacking ensemble-based model for A-IDS,where deep learning(e.g.,deep neural network[DNN])is used as base learner *** effectiveness of the proposed model and base DNN model are benchmarked empirically in terms of several performance metrics,i.e.,Matthew’s correlation coefficient,accuracy,and false alarm *** results indicate that the proposed model is superior to the base DNN model as well as other existing ML algorithms found in the literature.

关键词： Anomaly detection deep neural network intrusion detection system stacking ensemble

Deployment of Electric Induction Technologies into Cooktops Plates as a Part of Energy Sustainability

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Smart Grid and Renewable Energy 2022年第3期13卷 55-74页

作者： Alberto tama International University Center of Barcelona (UNIBA) University of Barcelona Barcelona Spain

For a long time now, humanity has been facing the phenomenon known as “climate change”, a major challenge of which we must be aware of what we are doing so as not to affect ourselves or future generations. It is evident that, if what is sought is a sustainable energy future, the current energy model implemented in certain countries and regions of the world is not the most adequate and makes the achievement of this goal unfeasible. This situation threatens to greatly alter our ecosystems and our social structures, and one of the key actions to mitigate it is, undeniably, the generalization of the use of renewable energy sources;and specifically, the non-conventional sources, referring to solar and wind, technologies that comply with the principle of energy complementarity;however, there are other possible solutions such as the deployment of programs that consider efficient cooking technologies;involving with it is everything related to energy security and equity, as well as environmental protection. In this article, as a technology to be considered to reduce and mitigate the Greenhouse Gases (GHG) emissions, an analysis of the efficiency assessment of electric induction cooktops and the determination of their potential energy savings are carried out. The impact of these results is taken into consideration and a series of conclusions and recommendations for improvement are issued.

关键词： Energy Sustainability Sustainable Development Clean Cooking Efficient Cooking Sustainable Development Goals Energy Savings Electric Induction Cooktop

Application of Life-Cycle Assessment for the Study of Carbon and Water Footprints of the 16.5 MWe Wind Farm in Villonaco, Loja, Ecuador

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Smart Grid and Renewable Energy 2021年第12期12卷 203-230页

作者： Alberto tama UNIBA University of Barcelona Barcelona Spain

Wind technology is considered to be among the most promising types of renewable energy sources, and due to high oil prices and growing concerns about climate change and energy security, it has been the subject of extensive considerations in recent years, including questions related to the relative sustainability of electricity production when the manufacturing, assembly, transportation and dismantling processes of these facilities are taken into account. The present article evaluates the environmental impacts, carbon emissions and water consumption, derived from the production of electric energy of the Villonaco wind farm, located in Loja, Ecuador, during its entire life cycle, using the Life Cycle Analysis for this purpose. Finally, it is concluded that wind energy has greater environmental advantages since it has lower values of carbon and water footprints than other energy sources. Additionally, with the techniques Cumulative Energy Demand and Energy Return on Investment, sustainability in the production of electricity from wind power in Ecuador is demonstrated;and, that due to issues of vulnerability to climate change, the diversification of its energy mix is essential considering the inclusion of non-conventional renewable sources such as solar or wind, this being the only way to reduce both the carbon footprint and the water from the energy supply.

关键词： Renewable Energy Life Cycle Assessment Wind Energy Carbon and Water Footprint Non-Conventional Renewable Sources

Carbon and Water Footprint Evaluation of 120Wp Rural Household Photovoltaic System: Case Study

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Smart Grid and Renewable Energy 2023年第3期14卷 31-59页

作者： Alberto tama Diego Vicente Department of Industrial Organization Engineering Universitat Carlemany (UCMA) Andorra France International University Center of Barcelona (UNIBA) University of Barcelona (UB) Barcelona Spain

This study uses the Life Cycle Analysis (LCA) to evaluate the magnitude of the environmental impact, in terms of global warming potential, and water footprint throughout the 20 years of useful life of a rural electrical energy concession comprised of 120Wp Households photovoltaic systems (HPS) in the isolated communities of San Martin, in the Peruvian Amazon region. On the other hand, due to the particular conditions of the system (installation, operation, maintenance, monthly tariff collection), it is necessary to know its real impact and sustainability;not only through the aforementioned environmental impact indicators, but also by energy intensity values required by the system throughout its life cycle. Therefore, this paper used the Cumulative energy demand (CED) method to determine the amount of energy taken from natural resources for each process involved in the LCA and calculated with this, i.e., the Energy Payback Time (EPBT) of the whole system. Likewise, the HPS has been environmentally compared to other case studies and the Peruvian Energy Mix, revealing a lower impact in the latter case and results within the range for stand-alone systems. Besides, the HPS shows a strong relation between energy production and O&M condition. Additionally, this study allows a further promotion of the use of this type of system in isolated areas, as well as the diversification of electricity generation in Peru.

关键词： Life Cycle Analysis Carbon Footprint Water Footprint Solar Home System Life Cycle Inventory

Spatial and seasonal variations of atmospheric N2O and CO2 fluxes from a subtropical mangrove swamp and their relationships with soil characteristics

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Spatial and seasonal variations of atmospheric N2O and CO2 f...

Tele-Analytical Characterization of the Eburnean Tectonic Structures within the Birimian Formations of Mako Area, Eastern Senegal

中国第五届红树林学术会议

作者： N.F.Y.tama Department of Biology and Chemistry City University of Hong Kong

Marine ecosystems are known to constitute a net source of greenhouse gases emission but the atmospheric gas fluxes, particularly from the mangrove swamps occupying inter-tidal zones are poorly characterized. Spatial and seasonal fluxes of N2O and CO2 from soil in Mai Po mangrove swamp in Hong Kong, South China and their relationships with soil characteristics were investigated. The N2O fluxes averaged from 0.73 to 12.13 μmol m-2 h-1 and the CO2 fluxes were between 0.38 and 31.23 mmol m-2 h-1. Both N2O and CO2 fluxes showed large spatial and seasonal variations in this swamp. The fluxes were higher at the landward site than the fore shore bare flat and higher fluxes were recorded in warm than cold seasons. The landward site had the highest content of soil organic carbon （OC）, total Kjeldahl nitrogen （TKN）, nitrate （NO3--N） and total phosphorus （TP） while the bare flat had the highest ammonium nitrogen （NH4+-N） concentration and soil denitrification potential activity. The N2O flux was positively related to CO2 flux, and both gases fluxes were positively related to redox potential, OC, and TP, negatively related to NH4+-N but the correlations with either potential nitrification or denitrification activities in soil were not significant. Stepwise analysis results indicated that the N2O emission was probably due to soil denitrifcation processes.

关键词： Global warming Greenhouse gases Mai Po mangrove Nitrification-denitrification

来源： cnki会议评论

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International Journal of Geosciences 2022年第1期13卷 12-32页

作者： Ibrahima Gassama Moussa Dabo Emmanuel tama Samoura Mamadou Ndiaye Department of Geology School of Science and Technology Sheikh Anta Diop University Dakar Senegal Géosciences Rennes UMR 6118 CNRS Université de Rennes 1 Campus de Beaulieu Rennes France

The tectonic structures of the Mako area in the Kédougou-Kéniéba inlier (KKI) were mapped with tele-analytical investigation which is validated by field data. This study is based on different images processing in particular: 1) the colored combinations (1 to 5) and panchromatic (8) thematic mapping bands of the Landsat-8 (ETM+) satellite;2) Digital Elevation Model (DEM) image of Space Shuttle Radar Topography Mission (SRTM);3) airborne geophysics (aeromagnetic and radiometric) images. In these images, four major directions of lineaments NS, NNE-SSW, NW-SE and EW would be related to the tectonic structures, have been identified and mapped. Field data confirm these four structural directions and show that most of these lineaments are related to faults, shear and/or thrust zones, or even basic rock dykes. N-S to NE-SW oriented lineaments are more frequent followed by those NW-SE oriented. These two directions of lineaments are generally in correlation with trajectories of major sinistral shear zones in the Mako area. They would be associated with the S2a and S2b schistosities relative to the D2 Eburnean major deformation. They often intersect the E-W oriented lineaments which are less frequent and sometimes folded and crenulated. This E-W oriented linea

Meaning of Rocks Basic Enclaves in the Eburnean Granitoids of Mako Area (Kédougou-Kéniéba Inlier, Senegal): Petrogenetic Implications

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International Journal of Geosciences 2021年第1期12卷 39-56页

作者： Ibrahima Gassama Moussa Dabo Mamadou Ndiaye Emmanuel tama Samoura Fatou Bop Ndong Université Cheikh Anta Diop de Dakar Département de Géologie Dakar Sénégal

The Mako area, located in eastern Sénégal, constitutes a segment of Paleoproterozoic (Birimian) formations of the Kédougou-Kéniéba Inliers (KKI) in the western part of the West African craton. The basic volcanism of the Birimian formations of the KKI has long been considered to be related to a single magmatic event associated with a Mid Oceanic Ridge Basalts (MORB) setting. The aim of this paper is to demonstrate on the basis of the architectural characteristics of the granitoids dark enclaves, the occurrence of at least two distinct phases of basic Magamtism in the Birimian of the KKI. The methodology consists of a cartography, a petrographic and architectural characterization of the dark enclaves within the Mako granitoids, in order to constrain their spatial and temporal relationships with the granitic magma. The results obtained are compared with those of the bibliography. We have pinpointed two types of enclaves depending o

关键词： Paleoproterozoic Kédougou-Kéniéba Mako Granitoids Basic Enclave Birimian

Emblica officinalis improves glycemic status and oxidative stress in STZ induced type 2 diabetic model rats

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Asian Pacific Journal of Tropical Medicine 2014年第1期7卷 21-25页

作者： Aneesa Ansari Md.Shahed Zaman Shahriar Md.Mehedi Hassan Shukla Rani Das Begum Rokeya Md.Anwarul Haque Md.Enamul Haque Nirupam Biswas tama Sarkar Department of Genetic Engineering and Biolechnology Jessore Science and Technology UniversityJessoreBangladesh Department of Biotechnology and Genetic Engineering Islamic UniversityKushtiaBangladesh Department of Biomedical Science Chonbuk National University Medical SchoolJeonju 561-712South Korea Department of Biochemistry and Molecular Biology Hajee Mohammad Danesh Science & Technology UniversityDinajpurBangladesh Department of Biochemistry and Cell Biology Bangladesh Institute of Research and Rehabilitation in DiabetesEndocrine and Metabolic Disorders (BIRDEM)DhakaBangladesh Department of Biochemistry and Molecular Biology University of DhakaDhaka-1000Bangladesh Department of Nutrition and Food Sciences University of HuddersfieldHuddersfiledHD1 3DHUnited Kingdom Department of Applied Nutrition and Food Technology Islamic UniversityKushtiaBangladesh

Objective:To evaluate the antidiabetic and antioxidant potential of Emblica officinalis(***)fruit on normal and type 2 diabetic ***:Type 2 diabetes was induced into the male Long-Evans *** rats were divided into nine groups including control groups receiving water,type 2 diabetic controls,type 2 diabetic rats treated with glibenclamide(T2GT)and type 2diabetic rats treated with aqueous extract of fruit pulp of *** were fed orally for8 weeks with a single *** was collected by cutting the tail tip on 0 and 28 days and by decapitation on 56 *** red blood cells and serum were used for evaluating different biochemical ***:Four weeks administration of aqueous extract of *** improved oral glucose tolerance in type 2 rats and after 8 weeks it caused significant(P<0.007)reduction in fasting serum glucose level compared to 0 *** decreased by 14%but there was no significant change in serum ALT,creatinine,cholesterol and insulin level in any ***,reduced erythrocyte malondialdehyde level showed no significant change(P<0.07)but reduced glutathione content was found to be increased significantly(P<0.05).Conclusions:The aqueous extract of *** has a promising antidiabetic and antioxidant properties and may be considered for further clinical studies in drug development.

关键词： Antioxidant Emblica officinalis Non-insulin dependent diabetes mellitus Type 2 diabetic rats Reduced glutathione