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demodulating the Response of Optical Fibre Long-Period Gratings： Genetic Algorithm Approach

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Chinese Physics Letters 2006年第9期23卷 2480-2482页

作者： P. S. André R. A. Sá. Ferreira C. M. L. Correia H. Kalinowshy 忻向军 J.L.Pinto instituto de Telecomunicaoes Universidade de A veiro Campus de Santiago 3810-193 A veiro Portugal departamento de Fisica Universidade de A veiro Campus de Santiago 3810-193 A veiro Portugal Centro de Investigacao em Materiais Compositos e Cergmicos CICECO Universidade de A veiro Campus de Santiago 3810-193 A veiro Portugal Centro Federal de Educao Tecnologica do Parana A v. Sere de Setembro 3165 80230-901 Curitiba-PR Brasil School of Electronic Engineering Beijing University of Posts and Telecommunications Beijing 100876

The extraction of the physical parameters of long period gratings from the spectral response is not an easy process. We present a demodulation technique to synthesize the physical parameters of a long period grating recorded in an optical fibre. The demodulation is achieved through the implementation of a genetic algorithm. The extracted parameters are in agreement with the typical values known for long period gratings.

关键词： SENSORS INdeX

Lanthanide-based downshifting layers tested in a solar car race

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Opto-Electronic Advances 2019年第6期2卷 1-8页

作者： Sandra F.H.Correia Ana R.N.Bastos Lianshe Fu Luís D.Carlos Paulo S.André Rute A.S.Ferreira department of Physics and CICECO-Aveiro Institute of Materials University of Aveiro3810-193 AveiroPortugal department of Electric and Computer Engineering and instituto de telecomunicacoes Instituto Superior TénicoUniversidade de Lisboa1049-001 LisbonPortugal department of Electronics Telecommunications and InformaticsInstituto de TelecomunicacoesUniversity of AveiroCampus Universitário de Santiago3810-193 AveiroPortugal

The mismatch between the AM1.5G spectrum and the photovoltaic (PV) cells absorption is one of the most limiting factors for PV *** overcome this constraint through the enhancement of solar energy harvesting,luminescent downshifting (LDS) layers are very promising to shape the incident sunlight and,thus,we report here the use of Tb^3+- and Eu^3+-doped organic-inorganic hybrid materials as LDS layers on Si PV *** measurements on the PV cell,done before and after the deposition of the LDS layers,confirm the positive effect of the coatings on the cell’s performance in the UV spectral *** maximum delivered power and the maximum absolute external quantum efficiency increased 14% and 27%,***,a solar powered car race was organized in which the small vehicle containing the coated PV cells presented a relative increase of 9% in the velocity,when compared to that with the uncoated one.

关键词： photovoltaics downshifting layers solar car organic-inorganic hybrids lanthanide ions

Structural Health Monitoring of Different Geometry Structures With Optical Fiber Sensors

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Photonic Sensors 2012年第4期2卷 357-365页

作者： Paulo ANTUNES Hugo RODRIGUES Rui TRAVANCA Licinio FERREIRA Humberto VARUM Paulo ANDRE instituto de telecomunicacoes Campus de Santiago 3810-193 Aveiro Portugal departamento de Fisica Universidade de Aveiro Campus de Santiago 3810-193 Aveiro Portugal departamento de Engenharia Civil Universidade de Aveiro Campus de Santiago 3810-193 Aveiro Portugal

In this paper, we describe the structural health monitoring of several structures, with different geometry, materials and behaviors, using optical fiber sensors. Those studies aimed to demonstrate the feasibility of s... 详细信息

关键词： Structural health monitoring optical fiber optical sensors

Property mapping of polycrystalline diamond coatings over large area

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Journal of Advanced Ceramics 2014年第1期3卷 56-70页

作者： Awadesh Kumar MALLIK Sandip BYSAKH Monjoy SREEMANY Sudakshina ROY Jiten GHOSH Soumyendu ROY Joana Catarina MENdeS Jose GRACIO Someswar DATTA CSIR-Central Glass&Ceramic Research Institute Kolkata 700032West BengalIndia department of Physics Indian Institute of Technology BombayPowaiMumbai 400076MaharashtraIndia instituto de Telecomunicações Campus Universitário de Santiago3810-193Portugal Nanotechnology Research Division Centre for Mechanical Technology and AutomationUniversity of Aveiro3810-193Portugal

Large-area polycrystalline diamond(PCD)coatings are important for fields such as thermal management,optical windows,tribological moving mechanical assemblies,harsh chemical environments,biological sensors,*** plasma chemical vapor deposition(MPCVD)is a standard technique to grow high-quality PCD films over large area due to the absence of contact between the reactive species and the filament or the chamber ***,the existence of temperature gradients during growth may compromise the desired uniformity of the final diamond *** the present work,a thick PCD coating was deposited on a 100-mm silicon substrate inside a 915-MHz reactor;the temperature gradient resulted in a non-uniform diamond *** attempt was made to relate the local temperature variation during deposition and the different properties of the final *** was found that there was large instability inside the system,in terms of substrate temperature(as high asΔT=212℃),that resulted in a large dispersion of the diamond coating’s final properties:residual stress(-15.8 GPa to+6.2 GPa),surface morphology(octahedral pyramids with(111)planes to cubo-octahedrals with(100)flat top surfaces),thickness(190μm to 245μm),columnar growth of diamond(with appearance of variety of nanostructures),nucleation side hardness(17 GPa to 48 GPa),quality(Raman peak FWHM varying from 5.1 cm^(-1) to 12.4 cm^(-1) with occasional splitting).This random variation in properties over large-area PCD coating may hamper reproducible diamond growth for any meaningful technological application.

关键词： plasma-enhanced chemical vapor deposition(CVD) diamond film mechanical properties nanostructures

debaryomyces hansenii supplementation in low fish meal diets promotes growth,modulates microbiota and enhances intestinal condition in juvenile marine fish

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Journal of Animal Science and Biotechnology 2024年第1期15卷 253-276页

作者： Ignasi Sanahuja Alberto Ruiz Joana P.Firmino Felipe E.Reyes-López Juan B.Ortiz-delgado Eva Vallejos-Vidal Lluis Tort Dariel Tovar-Ramírez Isabel M.Cerezo Miguel A.Moriñigo Carmen Sarasquete Enric Gisbert Aquaculture Program Institute of Agrifood Research and Technology(IRTA)La Rapita 43540Spain Centro de Biotecnologia Acuicola Universidad de Santiago de ChileSantiagoChile instituto de Ciencias Marinas de Andalucia(ICMAN-CSIC) Avda.Republica Saharaui no 2Campus Universitario Rio San PedroPuerto RealCadiz 11510Spain Nucleo de Investigaciones Aplicadas en Ciencias Veterinarias y Agronomicas Facultad de Medicina Veterinaria y AgronomiaUniversidad de Las AmericasSantiagoChile department of Cell Biology Physiologyand ImmunologyUniversitat Autonoma de BarcelonaBarcelonaSpain Centro de Investigaciones Biologicas del Noroeste SC CIBNORLa PazMexico department of Microbiology Instituto de Biotecnologia Y Desarrollo Azul(IBYDA)Faculty of SciencesUniversity of Malaga29010 MalagaSpain SCBI Bioinformatic UnitUniversity of Malaga29590 MalagaSpain

Background The development of a sustainable business model with social acceptance,makes necessary to develop new strategies to guarantee the growth,health,and well-being of farmed *** hansenii is a yeast species that can be used as a probiotic in aquaculture due to its capacity to i)promote cell proliferation and differen-tiation,ii)have immunostimulatory effects,iii)modulate gut microbiota,and/or iv)enhance the digestive *** provide inside into the effects of *** on juveniles of gilthead seabream(Sparus aurata)condition,we inte-grated the evaluation of the main key performance indicators coupled with the integrative analysis of the intestine condition,through histological and microbiota state,and its transcriptomic *** After 70 days of a nutritional trial in which a diet with low levels of fishmeal(7%)was supplemented with 1.1%of ***(17.2×10^(5) CFU),an increase of ca.12%in somatic growth was observed together with an improve-ment in feed conversion in fish fed a yeast-supplemented *** terms of intestinal condition,this probiotic modu-lated gut microbiota without affecting the intestine cell organization,whereas an increase in the staining intensity of mucins rich in carboxylated and weakly sulphated glycoconjugates coupled with changes in the affinity for certain lectins were noted in goblet *** in microbiota were characterized by the reduction in abundance of several groups of Proteobacteria,especially those characterized as opportunistic *** microarrays-based transcrip-tomic analysis found 232 differential expressed genes in the anterior-mid intestine of ***,that were mostly related to metabolic,antioxidant,immune,and symbiotic *** Dietary administration of *** enhanced somatic growth and improved feed efficiency param-eters,results that were coupled to an improvement of intestinal condition as histochemical and transcriptomic tools *** probiotic ye

关键词： debaryomyces hansenii Intestine condition Low fish meal diet Microbiota Transcriptomics Yeast probiotic

Mitigating adjacent channel interference in vehicular communication systems

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Digital Communications and Networks 2016年第2期2卷 57-64页

作者： Joao Almeida Muhammad Alam Joacluim Ferreira Arnaldo S.R. Oliveira lnstituto de Telecomunicar/Ses Campus Universitdirio de Santiago 3810-193 Aveiro Portugal deTI - Universidade de Aveiro Campus Universitdrio de Santiago 3810-193 Aveiro Portugal ESTGA - Universidade de Aveiro 3754-909 gueda Portugal

In the last few decades, dedicated wireless channels were specifically allocated to enable the development and implementation of vehicular communication systems. The two main protocol stacks, the WAVE stan- dards proposed by the IEEE in the United States and the ETSI ITS-G5 in Europe, reserved 10 MHz wide channels in the 5.9 GHz spectrum band. despite the exclusive use of these frequencies for vehicular com- munication purposes, there are still cross channel interference problems that have been widely reported in the literature. In order to mitigate these issues, this paper presents the design of a two-stage FIR low-pass filter, targeting the integration with a digital baseband receiver chain of a custom vehicular communications platform. The filter was tested, evaluated and optimized, with the simulation results proving the effectiveness of the proposed method and the low delay introduced in the overall operation of the receiver chain. 2016 Chongqing university of Posts and Telecommunications. Production and Hosting by Elsevier B.V. This is an open access article under the CC BY-NC-ND license

关键词： Intelligent transportation systemsVehicular communicationsAdjacent Channel InterferenceFilter designMulti-rate systemsDigital Hardware design

Cu(In,Ga)Se_(2)based ultrathin solar cells the pathway from lab rigid to large scale flexible technology

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npj Flexible Electronics 2023年第1期7卷 524-534页

作者： T.S.Lopes J.P.Teixeira M.A.Curado B.R.Ferreira A.J.N.Oliveira J.M.V.Cunha M.Monteiro A.Violas J.R.S.Barbosa P.C.Sousa I.Çaha J.Borme K.Oliveira J.Ring W.C.Chen Y.Zhou K.Takei E.Niemi F.L.deepak M.Edoff G.Brammertz P.A.Fernandes B.Vermang P.M.P.Salomé INL-International Iberian Nanotechnology Laboratory Avenida Mestre JoséVeiga4715-330 BragaPortugal Hasselt university imo-imomecMartelarenlaan 423500 HasseltBelgium Imec imo-imomecThor Park 83203600 GenkBelgium EnergyVille imo-imecThorPark 83203600 GenkBelgium CFisUC Department of PhysicsUniversity of CoimbraP-3004-516 CoimbraPortugal departamento de Física Universidade de AveiroCampus Universitário de Santiago3810-193 AveiroPortugal i3N Universidade de AveiroCampus Universitário de Santiago3810-193 AveiroPortugal Obducat AB Medicon Village22363 LundSweden Ångström Laboratory Department of Engineering SciencesUppsala University75121 UppsalaSweden Midsummer AB Elektronikhõjden 6SE-17543 JãrfãllaSweden CIETI Departamento de FísicaInstituto Superior de Engenharia do PortoInstituto Politécnico do Porto4200-072 PortoPortugal

The incorporation of interface passivation structures in ultrathin Cu(In,Ga)Se_(2)based solar cells is *** fabrication used an industry scalable lithography technique—nanoimprint lithography(NIL)—for a 15×15 cm^(2)dielectric layer *** with a NIL nanopatterned dielectric layer are benchmarked against electron-beam lithography(EBL)patterning,using rigid *** NIL patterned device shows similar performance to the EBL patterned *** impact of the lithographic processes in the rigid solar cells’performance were evaluated via X-ray Photoelectron Spectroscopy and through a Solar Cell Capacitance *** device on stainless-steel showed a slightly lower performance than the rigid approach,due to additional challenges of processing steel substrates,even though scanning transmission electron microscopy did not show clear evidence of impurity ***,time-resolved photoluminescence results strongly suggested elemental diffusion from the flexible ***,bending tests on the stainless-steel device demonstrated the mechanical stability of the CIGS-based device.

关键词： lithography ultrathin rigid

Effect of Seed Size, Suspension Recycling and Substrate Pre-Treatment on the CVD Growth of Diamond Coatings

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Open Journal of Applied Sciences 2015年第12期5卷 747-763页

作者： Awadesh Kumar Mallik Sandip Bysakh Radhaballabh Bhar Shlomo Z. Rotter Joana Catarina Mendes CSIR-Central Glass & Ceramic Research Institute Kolkata India department of Instrumentation Science Jadavpur University Kolkata India instituto de Telecomunicaç &otilde es Campus Universitário de Santiago Aveiro Portugal

CVD growth of uniform conformal polycrystalline diamond (PCD) coatings over complex three dimensional structures is very important material processing technique. It has been found that the nucleation and subsequent growth period is very critical for successful development of CVD diamond based technologies. There are many methods of enhancing diamond nucleation on foreign substrates-ultrasonic treatment with diamond seed suspension being the best among them. A combination of ultrasonic seeding (US) technique with prior treatment (PT) of the substrate under CVD diamond growth conditions for brief period of time, has found to be very effective in enhancing the diamond nucleation during CVD growth—together they are known as NNP. But successive usage of the same seeding suspension up to ten cycles deteriorates the seeding efficiency. 6th seeding cycle onwards the silicon substrates are barely get covered by diamond crystallites. Five different diamond micron grits were used for seeding the silicon substrates and it is observed that US with the sub-micron particles (0.25 μm) is very effective in efficient nucleation of PCD on Si substrates. PT of the substrate somewhat negates the effect of successive use of the same seeding slurry but it is best to avoid recycling of the same seeding suspension using micron size diamond grits.

关键词： Microwave Plasma CVD Seeding Diamond Micron Grits Novel Nucleation Process (NNP) Polycrystalline Diamond

Computer Modelling of Compact 28/38 GHz Dual-Band Antenna for Millimeter-Wave 5G Applications

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Computer Modeling in Engineering & Sciences 2023年第12期137卷 2867-2879页

作者： Amit V.Patel Arpan desai Issa Elfergani Hiren Mewada Chemseddine Zebiri Keyur Mahant Jonathan Rodriguez Raed Abd-Alhameed department of Electronics and Communication Engineering Chandubhai S Patel Institute of Technology(CSPIT)Charotar University of Science and Technology(CHARUSAT)Changa388421India The instituto de Telecomunica珲es Campus Universitário de SantiagoAveiro3810-193Portugal School of Engineering and Informatics University of BradfordBradfordBD71DPUK Electrical Engineering department Prince Mohammad Bin Fahd UniversityAl Khobar31952Saudi Arabia department of Electronics Laboratoire d’Electronique de Puissance et Commande Industrielle(LEPCI)University of Ferhat AbbasSétif19000Algeria

A four-element compact dual-band patch antenna having a common ground plane operating at 28/38 GHz is proposed formillimeter-wave communication systems in this ***-input-multiple-output(MIMO)antenna geometry consists of a slotted ellipse enclosed within a hollow circle which is orthogonally rotated with a connected partial ground at the *** overall size of the four elements MIMO antenna is 2.24λ×2.24λ(at 27.12GHz).The prototype of four-element MIMOresonator is designed and printed using Rogers RTDuroid 5880 withε_(r)=2.2 and loss tangent=0.0009 and having a thickness of 0.8 *** covers dual-band having a fractional bandwidth of 15.7%(27.12-31.34 GHz)and 4.2%(37.21-38.81 GHz)for millimeter-wave applications with a gain of more than 4 dBi at both *** proposed antenna analysis in terms ofMIMOdiversity parameters(Envelope Correlation Coefficient(ECC)and Diversity Gain(DG))is also carried *** experimental result in terms of reflection coefficient,radiation pattern,gain and MIMOdiversity parameter correlates very well with the simulated ones that show the potential of the proposed design for MIMO applications at millimeter-wave frequencies.

关键词： Connected ground diversity parameters dual-band antenna fifth generation(5G) mmwave multiple input multiple output(MIMO)