13 research outputs found

    Intrusion Detection Systems Based on Artificial Intelligence Techniques in Wireless Sensor Networks

    Full text link
    [EN] Intrusion detection system (IDS) is regarded as the second line of defense against network anomalies and threats. IDS plays an important role in network security. There are many techniques which are used to design IDSs for specific scenario and applications. Artificial intelligence techniques are widely used for threats detection. This paper presents a critical study on genetic algorithm, artificial immune, and artificial neural network (ANN) based IDSs techniques used in wireless sensor network (WSN)The authors extend their appreciation to the Distinguished Scientist Fellowship Program(DSFP) at King Saud University for funding this research.Alrajeh, NA.; Lloret, J. (2013). Intrusion Detection Systems Based on Artificial Intelligence Techniques in Wireless Sensor Networks. International Journal of Distributed Sensor Networks. 2013(351047):1-6. https://doi.org/10.1155/2013/351047S16201335104

    Adoption of Mobile Money for Healthcare Utilization and Spending in Rural Ghana

    No full text
    In this chapter, the authors discuss the potential link between mobile money adoption and health outcomes, which has not received much attention in the existing literature. They empirically examine the effects of mobile money adoption on healthcare utilization and spending of rural households in Ghana. Using data from the Ghana Living Standards Survey, the authors show that mobile money adoption enhances rural households’ healthcare utilization, a finding which is more pronounced in the case of female-headed households. The authors demonstrate that this finding is due to the positive association between mobile money use and the ability of rural households to spend on healthcare

    Enhanced luminescence by tunable coupling of Eu3+ and Tb3+ in ZnAl2O4:Eu3+:Tb3+ phosphor synthesized by solution combustion method

    Full text link
    [EN] ZnAl2O4:Eu3+ or Tb3+ (1 mol%) and ZnAl2O4:Eu3+/Tb3+ with varied concentrations of Eu3+ and Tb3+ were prepared by solution combustion method. The photoluminescence spectra of synthesized compounds shows that simultaneous doping of Tb3+ and Eu3+ causes enhancement in Eu3+ luminescence intensity. This indicates some energy transfer from Tb3+ to Eu3+. This phenomenon of Tb3+ -> Eu3+ energy transfer, accomplishing enhanced intensity of Eu3+ ions, is attributed to the cross relaxation phenomenon, which is favored by overlap between the donor and acceptor transition. The energy is transferred to Eu3+ cascade rapidly via non-radiative transitions to D-5(0) state. The synthesized compounds were characterized by XRD, SEM for their structural and morphological characteristics respectively.This work was supported by the European Commission through NanoCIS project (FP7-PEOPLE-2010-IRSES ref. 269279).Verma, N.; Marí, B.; Singh, KC.; Jindal, J.; Yadav, S.; Mittal, A. (2019). Enhanced luminescence by tunable coupling of Eu3+ and Tb3+ in ZnAl2O4:Eu3+:Tb3+ phosphor synthesized by solution combustion method. Journal of the Australian Ceramic Society. 55(1):179-185. https://doi.org/10.1007/s41779-018-0223-2S179185551Lv, C., Di, W., Liu, Z., Zheng, K., Qin, W.: Synthesis of porous upconverting luminescence α-NaYF4: Ln3+ microspheres and their potential applications as carriers. Dalton Trans. 43, 3681–3690 (2014)Xu, D., Zhang, Y., Zhang, D., Yang, S.: Structural, luminescence and magnetic properties of Yb3+-Er3+ codoped Gd2O3 hierarchical architectures. Cryst. Eng. Comm. 17, 1106–1114 (2015)Yang, W., Li, X., Chi, D., Zhang, H., Liu, X.: Lanthanide-doped upconversion materials: emerging applications for photovoltaics and photocatalysis. Nanotechnology. 24, 482001–482016 (2014)Mutelet, B., Boudin, S., Pérez, O., Rueff, J.M., Labbé, C., Jaff, P.A.: La1−xLnxH(O3PCH3)2 (Ln = Tb, Eu; 0 < x ≤ 1): an organic–inorganic hybrid with lanthanide chains and tunable luminescence properties. Dalton Trans. 44, 1186–1192 (2015)Chen, F., Chen, M., Yang, C., Liu, J., Luo, N., Yang, G., Chen, D., Li, L.: Terbium-doped gadolinium oxide nanoparticles prepared by laser ablation in liquid for use as a fluorescence and magnetic resonance imaging dual-modal contrast agent. Phys. Chem. Chem. Phys. 17, 1189–1196 (2015)Hemmer, E., Quintanilla, M., Legare, F., Vetrone, F.: Temperature-induced energy transfer in dye-conjugated upconverting nanoparticles: a new candidate for nanothermometry. Chem. Mater. 27, 235–244 (2015)Zhang, D., Wang, C., Liu, Y., Shi, Q., Wang, W., Zhai, Y.: Green and red photoluminescence from ZnAl2O4: Mn phosphors prepared by sol–gel method. J. Lumin. 132, 1529–1531 (2012)Motloung, S.V., Dejene, F.B., Swart, H.C., Ntwaeaborwa, O.M.: Effects of Zn/citric acid mole fraction on the structure and luminescence properties of the un-doped and 1.5% Pb2+ doped ZnAl2O4 powders synthesized by citrate sol–gel method. J. Lumin. 163, 8–15 (2015)Ravikumar, B.S., Nagabhushana, H., Sunitha, D.V., Sharma, S.C., Nagabhushana, B.M., Shivakumara, C.: Plant latex mediated green synthesis of ZnAl2O4:Dy3+ (1–9 mol%) nanophosphor for white light generation. J. Alloys Compd. 585, 561–571 (2014)Kaminska, I., Fronc, K., Sikora, B., Koper, K., Minikayev, R., Paszkowica, W., Sobczak, K., Wojciechowski, T., Chwastyk, M., Sobczak, K., Wojciechowski, T., Chwastyk, M., Reszka, A., Kowalski, B.J., Stepien, P., Elbau, D.: Synthesis of ZnAl2O4: (Er3+,Yb3+) spinel-type nanocrystalline upconverting luminescent marker in HeLa carcinoma cells, using a combustion aerosol method route. RSC Adv. 4, 56596–56604 (2014)Araújo, P.M.A.G., Santos, P.T.A., Santos, P.T.A., Silva, F.N., Costa, A.C.F.M., Araújo, E.M. Obtaining of chitosan/ZnAl1.9Eu0.05O4 film for application as biomaterial, Mater. Sci. Forum, 805, 65–70, (2015)Hill, R.J., Craig, J.R., Gibbs, G.V.: Systematics of the spinel structure type. Phys. Chem. Miner. 4, 317–339 (1979)Kashii, N., Maekawa, H., Hina, Y.: Dynamics of the cation mixing of MgAl2O4 and ZnAl2O4 spinel. J. Am. Ceram. Soc. 82, 1844–1848 (1999)Costa, A.C.F.M., Kiminami, R.H.G.A., Santos, P.T.A., Silva, J.F.: ZnAl2O4 co-doped with Yb3+/Er3+ prepared by combustion reaction: evaluation of photophysical properties. J. Mater. Sci. 48, 172–177 (2013)Cornu, L., Gaudon, M., Jubera, V.: ZnAl2O4 as a potential sensor: variation of luminescence with thermal history. J. Mater. Chem. C. 1, 5419–5428 (2013)Bunzli, J.-C.G., Piguet, C.: Taking advantage of luminescent lanthanide ions. Chem. Soc. Rev. 34, 1048–1077 (2005)Lou, Z., Hao, J.: Cathodoluminescence of rare-earth-doped zinc aluminate films. Thin Solid Films. 450, 334–340 (2004)Yang, C.-C., Chen, S.-Y., Cheng, S.-Y.: Synthesis and physical characteristics of ZnAl2O4 nanocrystalline and ZnAl2O4/Eu core-shell structure via hydrothermal route. Powder Technol. 148, 3–6 (2004)Martinez-Sanchez, E., Garcia-Hipolito, M., Guzman, J., Ramos-Brito, F., Santoyo-Salazar, J., Martinez-Martinez, R., Alvarez-Fregoso, O., Ramos-Cortes, M.I., Mendez-Delgado, J.J., Falcony, C.: Cathodoluminescent characteristics of Sm-doped ZnAl2O4 nanostructured powders. Phys. Stat. Solidi (a). 202, 102–107 (2005)Garcıa-Hipolito, M., Guzma’n-Mendoza, J., Martı’nez, E., Alvarez-Fregoso, O., Falcony, C.: Growth and cathodoluminescent characteristics of blue emitting cerium-doped zinc aluminate layers synthesized by spray pyrolysis technique. Phys. Stat. Solidi (a). 201, 1510–1517 (2004)Wang, S.F., Gu, F., Lu, M.K., Cheng, X.F., Zou, W.G., Zhou, G.J., Wang, S.M., Zhou, Y.Y.: Synthesis and photoluminescence characteristics of Dy3+-doped ZnAl2O4 nanocrystals via a combustion process. J. Alloys Compd. 394, 255–258 (2005)Heffern, M.C., Matosziuk, L.M., Meade, T.J.: Lanthanide probes for bioresponsive imaging. Chem. Rev. 114, 4496–4539 (2014)Tshabalala, K.G., Cho, S.H., Park, J.K., Pitale, S.S., Nagpure, I.M., Kroon, R.E., Swart, H.C., Ntwaeaborwa, O.M.: Luminescence properties of Ce3+ and Tb3+ co-activated ZnAl2O4 phosphor. Phys. B Condens. Matter. 407, 1489–1492 (2012)Barros, B.S., Melo, P.S., Kiminami, R.H.G.A., Costa, A.C.F.M., De Sá, G.F., Alves, S.: Photophysical properties of Eu3+ and Tb3+−doped ZnAl2O4 phosphors obtained by combustion reaction. J. Mater. Sci. 41, 4744–4748 (2006)Satapathy, K.K., Mishra, G.C., Khan, F.: ZnAl2O4: Eu novel phosphor: SEM and mechanoluminescence characterization synthesized by solution combustion technique. Luminescence. 30, 564–567 (2015)Rusu, E., Ursaki, V., Novitschi, G., Vasile, M., Petrenco, P., Kulyuk, L.: Luminescence properties of ZnGa2O4 and ZnAl2O4 spinels doped with Eu3+ and Tb3+ ions. Phys. Stat. Solidi C. 6, 1199–1202 (2009)Mindru, I., Marinescu, G., Gingasu, D., Patron, L., Diamandescu, L., Ghica, C., Mironov, B.: Doped aluminium based spinels synthesized by a soft chemistry method. Mater. Sci. Eng. B. 170, 99–106 (2010)Peng, C., Li, G., Geng, D., Shang, M., Hou, Z., & Lin, J. Fabrication and luminescence properties of one-dimensional ZnAl2O4 and ZnAl2O4: A3+ (A = Cr, Eu, Tb) microfibers by electrospinning method, Mater. Res. Bull., 47, 3592–3599 (2012)Valenzuela, M.A., Bosch, P., Aguilar-rios, G., Montoya, A., Schifter, I.J.: Comparison between sol-gel, coprecipitation and wet mixing synthesis of ZnAl2O4, Sol–Gel. Sci. Technol. 8, 107–110 (1997)Hong, W.S., De Jonghe, L.C., Yang, X., Rahaman, M.N.: Reaction sintering of ZnO-Al2O3. J. Am. Ceram. Soc. 78, 3217–3224 (1995)Kingsley, J.J., Suresh, K., Patil, K.C.: Combustion synthesis of fine-particle metal aluminates. J. Mater. Sci. 25, 1305–1312 (1990)Marí, B., Singh, K.C., Verma, N., Jindal, J.: Optical properties of Yb-doped ZnO/MgO nanocomposites. Ceram. Int. 42, 13018–13023 (2016)Li, Z., Zhang, S., Lee, W.E.: Molten salt synthesis of zinc aluminate powder. J. Eur. Ceram. Soc. 27, 3407–3412 (2007)Zawadzki, M.: Synthesis of nanosized and microporous zinc aluminate spinel by microwave assisted hydrothermal method (microwave–hydrothermal synthesis of ZnAl2O4). Solid State Sci. 8, 14–18 (2006)Dhak, D., Pramanik, P.: Particle size comparison of soft-chemically prepared transition metal (Co, Ni, Cu, Zn) aluminate spinels. J. Am. Ceram. Soc. 89, 1014–1021 (2006)Chen, L., Sun, X., Liu, Y., Zhou, K., Li, Y.: Porous ZnAl2O4 synthesized by a modified citrate technique. J. Alloys Compd. 376, 257–261 (2004)Dabre, K.V., Dhoble, S.J.: Synthesis and assessment of photoluminescent properties of Ca4−2xAl6WO16: REx,Nax (RE = Eu3+, Dy3+ and Sm3+) phosphors. RSC Adv. 5, 60409–60418 (2015)Krishna, R.H., Nagabhushana, B.M., Nagabhushana, H., Chakradhar, R.P.S., Suriyamurthy, N., Sivaramakrishna, R., Shivakumara, C., Rao, J.L., Thomas, T.: Combustion synthesis approach for spectral tuning of Eu doped CaAl2O4 phosphors. J. Alloys Compd. 589, 596–603 (2014)Marí, B., Singh, K.C., Verma, N., Mollar, M., Jindal, J.: Luminescence properties of the Eu2+/Eu3+ activated barium aluminate phosphors with Gd3+ concentration variation. Trans. Ind. Ceram. Soc. 74, 157–161 (2015)Sun, F., Zhao, J.: Blue-green BaAl2O4: Eu2+,Dy3+ phosphors synthesized via combustion synthesis method assisted by microwave irradiation. J. Rare Earths. 29, 326–329 (2011)Ragupathi, C., Kennedy, L.J., Vijaya, J.: A new approach: synthesis, characterization and optical studies of nano-zinc aluminate. Adv. Powder Technol. 25, 267–273 (2014)Singh, V., Chakradhar, R.P.S., Rao, J.L., Kim, D.K.: Characterization, EPR and luminescence studies of ZnAl2O4: Mn phosphors. J. Lumin. 128, 394–402 (2008)Wang, S., Zhao, X., Zhou, S., Zhou, L., Xia, G.: Enhanced luminescent properties of solution combustion synthesized nanocrystalline Y3Al5O12: Eu3+ phosphors. Curr. Nanosci. 9, 183–186 (2013)Som, S., Sharma, S.K.: Eu3+/Tb3+−codoped Y2O3 nanophosphors: rietveld refinement, bandgap and photoluminescence optimization. J. Phys. D: Appl. Phys. 45, 415102 (2012)Zhao, C.J., Cai, J.L., Li, R.Y., Tie, S.L., Wan, X., Shen, J.Y.: White light emission from Eu3+/Tb3+/Tm3+ triply-doped aluminoborate glass excited by UV light. J. Non-Cryst. Solids. 358, 604–608 (2012)Xu, M., Wang, L., Jia, D., Zhao, H.: Tuning the color emission of Sr2P2O7: Tb3+, Eu3+ phosphors based on energy transfer. J. Am. Ceram. Soc. 98, 1536–1541 (2015)Tu, D., Liang, Y., Liu, R., Li, D.: Eu/Tb ions co-doped white light luminescence Y2O3 phosphors. J. Lumin. 131, 2569–2573 (2011
    corecore