Дисертації з теми "Electrical measurent"
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South, G. "A technique for measuring the electrical impedance of mechanical joints in electrically conductive structures." Thesis, University of Central Lancashire, 1992. http://clok.uclan.ac.uk/20064/.
Повний текст джерелаStan, Nikola. "Complete Measurement System for Measuring High Voltage and Electrical Field Using Slab-Coupled Optical Fiber Sensors." BYU ScholarsArchive, 2018. https://scholarsarchive.byu.edu/etd/7053.
Повний текст джерелаClippingdale, Andrew John. "The sensing of spatial electrical potential." Thesis, University of Sussex, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.385059.
Повний текст джерелаMiller, Stuart M. "Electrical measurement of sucrose in sugar beet." Thesis, Cranfield University, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.294156.
Повний текст джерелаMcAllister, Abraham Roy 1976. "Measuring electrical properties of the tectorial membrane." Thesis, Massachusetts Institute of Technology, 1999. http://hdl.handle.net/1721.1/80548.
Повний текст джерелаIncludes bibliographical references (leaves 71-72).
by Abraham Roy McAllister.
M.Eng.
Schippan, Frank. "The contactless measurement of the electrical resistivity." Thesis, Loughborough University, 1997. https://dspace.lboro.ac.uk/2134/14732.
Повний текст джерелаBerrie, Jeffery A. "Measurement of electrical parameters for planar materials /." The Ohio State University, 1992. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487759436328874.
Повний текст джерелаBlad, Börje. "Electrical impedence tomography for temperature measurement in hyperthermia." Lund : Dept. of Electrical Measurements, Lund Institute of Technology, 1994. http://catalog.hathitrust.org/api/volumes/oclc/39225511.html.
Повний текст джерелаRicketts, David. "Diagnosis of occlusal caries by electrical resistance measurement." Thesis, King's College London (University of London), 1995. https://kclpure.kcl.ac.uk/portal/en/theses/diagnosis-of-occlusal-caries-by-electrical-resistance-measurement(1bbd1235-84ef-427f-ae04-65591cc71d66).html.
Повний текст джерелаJones, Paul. "Electrical measurement of large area substation earth grids." Thesis, Swansea University, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.367883.
Повний текст джерелаRitchie, L. J. "Detection, measurement and analysis of electrical insulation oils." Thesis, Cranfield University, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.273956.
Повний текст джерелаTronko, V. D., M. O. Chuzha, В. Д. Тронько, and М. О. Чужа. "Measuring current in electrical circuits using a polarimeter." Thesis, National aviation university, 2021. https://er.nau.edu.ua/handle/NAU/50502.
Повний текст джерелаВ представленій роботі запропоновано оптичний пристрій для вимірювання струму. Він складається з поляриметра, індикатора та вхідного пристрою. В основу його роботи покладено функціональна залежність зміни параметрів поляризованого світла в поляриметрі від значень струму, що вимірюються. Запропонований вимірювач струму дає можливість зменшити габарити та масу конструкції, а також підвищити точність вимірювань.
Bowlan, Pamela. "Measuring the spatiotemporal electric." Diss., Atlanta, Ga. : Georgia Institute of Technology, 2009. http://hdl.handle.net/1853/28188.
Повний текст джерелаCommittee Chair: Rick Trebino; Committee Member: Jennifer Curtis; Committee Member: John Buck; Committee Member: Mike Chapman; Committee Member: Stephen Ralph.
Tekgun, Burak. "Analysis, Measurement and Estimation of the Core Losses in Electrical Machines." University of Akron / OhioLINK, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=akron1481047992739036.
Повний текст джерелаSun, Wei Ping. "Measurement and analysis of MnS precipitation in electrical steels." Thesis, McGill University, 1991. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=39266.
Повний текст джерелаThe nucleation sites for precipitation during creep testing were investigated with the aid of electron microscopy. It was concluded that the progress of MnS precipitation can be divided into three stages: nucleation, growth and coarsening. There exists a strong tendency for the nuclei to be formed on dislocations at lower temperatures. However, nucleation at grain boundaries is preferred as the temperature is increased. The classical diffusion-controlled growth theory is not satisfactory for strain-induced MrS precipitation. Thus, a modification was made in such a dynamic case by taking the effects of deformation vacancies into account. The kinetics during the coarsening stage are controlled by both bulk and grain boundary diffusion.
The microstructural examinations revealed that both grain deformation and grain boundary sliding take place in the electrical steels at hot working temperatures. Quantitative evaluations showed that the latter process contributes about one-sixth to one-tenth the total strain under the current experimental conditions. The strong retardation of grain deformation after the occurrence of precipitation is explained in terms of the interfacial pinning of mobile dislocations by these incoherent particles. It is also demonstrated that the finely-dispersed precipitates slow down the boundary sliding rate. (Abstract shortened by UMI.)
A'Arabi, M. M. "Novel methods for measuring power loss in electrical steels." Thesis, Bucks New University, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.380858.
Повний текст джерелаKolic, Edo. "Bearing current and shaft voltage measurement in electrical motors." Thesis, Högskolan Väst, Avdelningen för data-, elektro- och lantmäteriteknik, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:hv:diva-10722.
Повний текст джерелаHenriksson, David, and Oscar Johansson. "Energy Measurement of Electric Fence." Thesis, Linköpings universitet, Institutionen för teknik och naturvetenskap, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-80547.
Повний текст джерелаZhao, Dong. "Exploring Construction Safety and Control Measures through Electrical Fatalities." Diss., Virginia Tech, 2015. http://hdl.handle.net/10919/71712.
Повний текст джерелаPh. D.
Weemees, Ilmar Andrew. "Development of an electrical resistivity cone for groundwater contamination studies." Thesis, University of British Columbia, 1990. http://hdl.handle.net/2429/28730.
Повний текст джерелаApplied Science, Faculty of
Civil Engineering, Department of
Graduate
Lai, Sin-yi, and 賴善怡. "Effects of low current electrical stimulation of neck muscles on voicing." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2010. http://hub.hku.hk/bib/B46339188.
Повний текст джерелаBoykov, Nikolay D. "Measurements of the electrical properties of coal measure rocks." Morgantown, W. Va. : [West Virginia University Libraries], 2006. https://eidr.wvu.edu/etd/documentdata.eTD?documentid=4715.
Повний текст джерелаTitle from document title page. Document formatted into pages; contains xi, 89 p. : ill. (some col.). Includes abstract. Includes bibliographical references (p. 88-89).
PAU, MARCO. "State estimation in electrical distribution systems." Doctoral thesis, Università degli Studi di Cagliari, 2015. http://hdl.handle.net/11584/266606.
Повний текст джерелаUsdosen, Ndifreke. "Algorithms for selecting optimal measurement locations in electrical resistivity tomography." Thesis, University of Reading, 2013. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.603521.
Повний текст джерелаWesterlund, Per. "Condition measuring and lifetime modelling of electrical power transmission equipment." Licentiate thesis, KTH, Elektroteknisk teori och konstruktion, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-167136.
Повний текст джерелаElnätet är viktigt i det moderna samhället, så antalet avbrott bör vara lågt. Särskilt stamnätet bör ha en särskilt hög tillgänglighet, då det transporterar elektrisk energi tvärsöver landet. Då blir det svårt att planera avbrott för underhåll och utbyggnad. Denna avhandling tar upp tjugo studier av fel i brytare och frånskiljare med data om felorsak och livslängd. Den har också en översikt av ett fyrtiotal olika metoder för tillståndsmätningar för brytare och frånskiljare, som huvudsakligen rör de elektriska kontakterna och de mekaniska delarna. Eftersom det inte finns någon beskriven metod för att övervaka elektriska kontakter för spänningar på runt 400 kV, har ett system med IR sensorer installerats på de nio kontakterna på sex frånskiljare. Målet är att minska antalet avbrott för underhåll genom att skatta skicket hos kontakterna, när frånskiljarna fortfarande är kopplade till högspänning. De uppmätta temperaturerna tas emot genom radio och behandlas genom regression mot kvadraten av strömmen, då den bästa exponenten för strömmen visade sig vara 2,0. Förklaringsfaktorn $R^2$ är hög, över 0,9. För varje kontakt ger det en regressionskoefficient, som blir en skattning av kontaktens skick. Ju högre koefficienten är, desto mer värme utvecklas det i kontakten, vilket kan leda till skador på materialet. Kontakternas olika koefficienter ger en rankordning dem och därmed en möjlighet att prioritera vilken frånskiljare som ska underhållas först. Systemet kan också användas för att minska eller öka den tillåtna strömmen baserat på skicket.
QC 20150522
Lindström, Jonas. "Measurement system for laboratory use : For studies in electrical science." Thesis, Uppsala universitet, Elektricitetslära, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-256667.
Повний текст джерелаBennett, Mark Andrew. "On-line measurement of multiphase processes using electrical capacitance tomography." Thesis, University of Exeter, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.302541.
Повний текст джерелаSmith, George St J. V. "The characterisation of InSb quantum well heterostructures by electrical measurement." Thesis, Cardiff University, 2019. http://orca.cf.ac.uk/119553/.
Повний текст джерелаPhilip-Chandry, Rekha. "Fluid flow measurement using electrical and optical fibre strain gauges." Thesis, Liverpool John Moores University, 1997. http://researchonline.ljmu.ac.uk/5565/.
Повний текст джерелаYaremyk, R. Ya. "DSP-Based Information-Measuring Microdevice for Electrical Impedance Spectroscopy Analysis." Thesis, Sumy State University, 2016. http://essuir.sumdu.edu.ua/handle/123456789/47278.
Повний текст джерелаFaraj, Yousef. "Measurement and visualisation of slurry flow using electrical resistance tomography." Thesis, University of Leeds, 2013. http://etheses.whiterose.ac.uk/4604/.
Повний текст джерелаStarrs, Gerard. "Measurement of the electrical properties of concrete at radio frequencies." Thesis, Edinburgh Napier University, 1994. http://researchrepository.napier.ac.uk/Output/6573.
Повний текст джерелаFulton, William Sean. "Electrical impedance tomography applied to body-support interface pressure measurement." Thesis, University of Bath, 1995. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.336236.
Повний текст джерелаSiebrits, F. B. (Francois Bart). "Field implementation of a transient voltage measurement facility using HV current transformers." Thesis, Stellenbosch : Stellenbosch University, 2003. http://hdl.handle.net/10019.1/53426.
Повний текст джерелаENGLISH ABSTRACT: The bandwidth of standard HV measurement devices such as capacitive voltage transformers is too limited in order to measure wideband phenomena. This thesis is concerned with the investigation into a non- intrusive HV transient voltage measurement facility using standard substation HV current transformers (CI's) configured in a transconductance topology. The sensing, summation and integration of the CT capacitive earth currents are investigated. This thesis also reports on the development of a optically isolated link using optical fibre for signal transfer and a computer based data acquisition system.
AFRIKAANSE OPSOMMING: Standaard hoogspannings (HS) meettoerusting soos kapasitiewe spannmgs transformators het beperkte bandwydte vir die meet van wyeband verskynsels. Hierdie tesis handel oor die implementering van 'n HS meetstelsel wat op meinbrekende wyse oorgangsverskynsels meet deur middel van HS stroomtransformators wat in 'n transkonduktansie topologie gekonfigureer is. Die meet, sommasie en integrasie van kapasitoewe grondstrome word ondersoek. Hierdie tesis doen ook verslag aangaande die ontwikkeling van 'n optiese geisoleerde koppelvlak wat gebruik word vir seinoordrag en 'n rekenaar gebasseerde data versamelaar.
pdv201406
Groenewald, Ben. "Substrate curvature measurement system." Master's thesis, University of Cape Town, 1999. http://hdl.handle.net/11427/19376.
Повний текст джерелаAGUIAR, ALEXANDRE STREET DE. "CERTAINTY EQUIVALENT AND RISK MEASURES IN ELECTRICAL ENERGY TRADE DECISIONS." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2008. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=11477@1.
Повний текст джерелаEm problemas de decisão sob incerteza que dependam da preferência entre fluxos multi-período, como é o caso dos problemas de comercialização de contratos de energia elétrica no Brasil, o agente deve saber expressar sua preferência por diferentes distribuições em cada período e, além disso, deve também especificar uma preferência entre períodos. Classicamente a abordagem utilizada é definir um funcional de preferência de von Neumann e Morgenstern separável entre os períodos, composto pela soma da esperança de utilidades que modelam a preferência em cada período. Então, para expressar a preferência entre períodos, esta soma é ponderada por um fator de desconto que visa expressar a impaciência do agente no consumo entre os períodos. Nesta abordagem, a especificação do fator de desconto torna-se uma tarefa bastante subjetiva, uma vez que estamos ponderando utilidades esperadas e não valores monetários. Devido a essa subjetividade e da dificuldade de se especificar a própria função utilidade de cada período, os grupos de finanças divergiram para uma abordagem mais pragmática, baseada na análise e controle dos riscos assumidos em suas decisões. Neste sentido, a empresa que busca maximizar a expectativa de lucro, especifica em valores monetários, um conjunto de restrições sobre as perdas que esta está disposta a incorrer, baseando-se para isso em suas probabilidades de ocorrência. Assim, durante as ultimas quatro décadas, muitas pesquisas e desenvolvimentos foram realizados nesta área, no sentido de se estabelecer medidas de risco que proporcionassem propriedades desejáveis para essa classe de problemas. Desta forma, criou-se um gap entre as duas abordagens, financeira e econômica, as quais possuem raízes em comum: modelar o comportamento de agentes frente ao risco. Assim sendo, esta tese tem três objetivos: (i) propor uma abordagem alternativa para o uso de funções utilidades em problemas de comercialização de energia elétrica multi-período, baseada no valor presente dos equivalentes certos de cada período; (ii) mostrar como tal abordagem pode ser modelada matematicamente e formulada através de um problema de programação linear inteira mista (PLIM) ao considerarmos uma função utilidade linear por partes, e (iii) mostrar a conexão entre a teoria de utilidade e problemas de maximização da renda esperada sujeito a restrições de risco do tipo alfa-CVaR.
In decision under uncertainty problems that depend on multi- period preferences, as the case of trading electricity contracts in Brazil, agents should expresses their inter and intratemporal preferences. The classical economical approach is to define a time separable von Neumann and Morgenstern utility functional. This functional is composed by the sum of the expected utility of each period times an impatience factor that should express the agent`s intertemporal preference. This approach demands the specification of a subjective impatience factor, which should weight utilities units. Due to this subjectiveness and its estimation difficulties, the applied financial groups started to develop more pragmatic approaches based on risk control. In this sense, companies that maximize expected profit will impose constraints on acceptable losses using estimated occurrence probabilities of different outcomes. In this sense, the economical and applied financial approaches have been diverging in the last four decades and, during this time, many studies and developments have been done in the risk metrics field to generate and prove stability and coherence properties for the proposed metrics. This thesis has three main objectives: (i) propose an alternative approach for multi-period decisions problems based on the present value of the certainty equivalent of each period; (ii) show how this approach can be modeled as a mixed integer linear programming problem (MILP) when adopting a piecewise linear utility function; and (iii) provide connections between utility theory and expected maximization problems constrained to alpha-CVaR risk metrics.
Haddad, Stephen. "Texture measures for segmentation." Master's thesis, University of Cape Town, 2007. http://hdl.handle.net/11427/7461.
Повний текст джерелаTexture is an important visual cue in both human and computer vision. Segmenting images into regions of constant texture is used in many applications. This work surveys a wide range of texture descriptors and segmentation methods to determine the state of the art in texture segmentation. Two types of texture descriptors are investigated: filter bank based methods and local descriptors. Filter banks deconstruct an image into several bands, each of which emphasises areas of the image with different properties. Textons are an adaptive histogram method which describes the distribution of typical feature vectors. Local descriptors calculate features from smaller neighbourhoods than filter banks. Some local descriptors calculate a scale for their local neighbourhood to achieve scale invariance. Both local and global segmentation methods are investigated. Local segmentation methods consider each pixel in isolation. Global segmentation methods penalise jagged borders or fragmented regions in the segmentation. Pixel labelling and border detection methods are investigated. Methods for measuring the accuracy of segmentation are discussed. Two data sets are used to test the texture segmentation algorithms. The Brodatz Album mosaics are composed of grayscale texture images from the Brodatz Album. The Berkeley Natural Images data set has 300 colour images of natural scenes. The tests show that, of the descriptors tested, filter bank based textons are the best texture descriptors for grayscale images. Local image patch textons are best for colour images. Graph cut segmentation is best for pixel labelling problems and edge detection with regular borders. Non-maxima suppression is best for edge detection with irregular borders. Factors affecting the performance of the algorithms are investigated.
Xiao, Lianzhen. "Interpretation of hydration process of concrete based on electrical resistivity measurement /." View abstract or full-text, 2007. http://library.ust.hk/cgi/db/thesis.pl?CIVL%202007%20XIAO.
Повний текст джерелаPérez-Vázquez, Losada Sonia. "Implementation of and Electrical Bioimpedance Measurement System for Renal Function Monitoring." Thesis, Högskolan i Borås, Institutionen Ingenjörshögskolan, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:hb:diva-18839.
Повний текст джерелаUppsatsnivå: D
Amruthaluri, Sushma. "Synthesis of copper carbon nanotube composite and its electrical conductivity measurement." FIU Digital Commons, 2008. http://digitalcommons.fiu.edu/etd/1283.
Повний текст джерелаEntus, Jonathan. "Use of time domain reflectometry to monitor water content and electrical conductivity of saline soil." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2000. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape3/PQDD_0032/MQ64350.pdf.
Повний текст джерелаJohanssson, Stefan. "Precision Amplifier for Applications in Electrical Metrology." Thesis, Linköping University, Linköping University, Electronics System, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-16896.
Повний текст джерелаThis master's thesis addresses two main problems. The first is how to suppress a common mode voltage that appears for current shunts, and the second how to let a voltage divider work under an unloaded condition to prevent loading errors and thereby a decreased measurement accuracy. Both these problems occurs during calibration of power meters, and verification of current shunts and voltage dividers. To the first problem three alternative solutions are presented; prototype a proposed instrumentation amplifier circuit, evaluate the commercial available instrumentation amplifier Analog Devices AD8130 or let the voltage measuring device suppress the common mode voltage. It is up to the researchers at SP to choose a solution. To address the second problem, a prototype buffer amplifier is built and verified. Measurements of the buffer amplifier show that it performs very well. At 100 kHz, the amplitude error is less than 20 μV/V, the phase error is less than 20 μrad, and the input Rp is over 10 MΩ. This is performance in line with the required to make accurate measurements possible at 100 kHz and over that.
Niemi, Jan. "Towards a new sensing strategy for measuring paper pulp properties : a combination of ultrasonic and optical measurement techniques." Licentiate thesis, Luleå : Luleå University of Technology, 2007. http://epubl.ltu.se/1402-1757/2007/17/.
Повний текст джерелаDupont, Anne-Caroline. "Therapeutic electrical stimulation, reversal of disuse atrophy and clinical outcome measures." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2001. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/NQ56077.pdf.
Повний текст джерелаBallard, Norman. "Electrode length measurement in electric arc furnaces." Master's thesis, University of Cape Town, 1995. http://hdl.handle.net/11427/18232.
Повний текст джерелаAHMAD, SHOAIB. "Finite Precision Error in FPGA Measurement." Thesis, Linnéuniversitetet, Institutionen för fysik och elektroteknik (IFE), 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-49646.
Повний текст джерелаPassed
Digital filters and FPGA
Chuang, W. C., and 鍾旺成. "Electrical Characteristic Measurement of GaN." Thesis, 1998. http://ndltd.ncl.edu.tw/handle/77249529553401108009.
Повний текст джерела國立交通大學
電子物理系
86
We has successfully grown the GaN film using metalorganic chemical phase deposition method. From the Van der Pauw and Hall measurement, it is found that the GaN film quality is very sensitive to the growth conditions, such as buffer layer thickness, ramping rate of buffer layer thermal annealing, growth temperature, growth rate, nitridation and V/Ⅲ ratio. Nevertheless, a device quality of GaN film has been obtained. The corresponding carrier mobility as high as 300 cm2/Vs and carrier concentration is lower than 1017 cm-3. Moreover, a schottky diode coated by Pd on n-type GaN was fabricated. The measured ideality factor is of 1.115 and the barrier heights as determined by I-V, I-V-T, C-V measurements are -0.9 eV, 0.91 eV and 1.23 eV, respectively. These values indicate a good quality of our GaN film. In addition, we have found that the GaN films prepared by our group possess a majority-carrier trap located at 0.435 eV below conduction band. Since the trap contration and cross-section are rather low (5.64×1014 cm-3 and 4.618×10-18 cm-2 respectively), we believe this trap will not bring any affections on the performance of GaN devices.
Yang, Kao-Yueh, and 楊國岳. "Electrical Modeling and Measurement for." Thesis, 2001. http://ndltd.ncl.edu.tw/handle/83220013283298017260.
Повний текст джерела國立中正大學
電機工程研究所
89
This thesis establishes an RF circuit model for the plastic ball grid array (PBGA) package from the approach of time-domain and frequency-domain measurements. The test fixture, specially designed for the PBGA436 package, is developed to ensure the measurement accuracy and reliability. The time-domain measurement is performed with Time Domain Reflection Analyzer (TDR), from which the element values of the circuit model are extracted. To extend the applicable frequency range of the model, the frequency-domain S parameters are measured by Vector Network Analyzer (VNA). With these results, the circuit model established by the time-domain measurement is improved to the 5GHz range.
Lu, I.-Cheng, and 盧奕丞. "Fabrication and Electrical Measurement of MoS2 Transistors." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/3v83ep.
Повний текст джерела國立中興大學
物理學系所
101
We report the fabrication and the characterization of Molybdenum disulfide (MoS2) thin film transistors. During the fabrication process, we first exfoliated a nano-scale thin film MoS2 layer from a commercial MoS2 ore mechanically by using 3M scotch tapes and transferred it to a heavy doped Si substrate with a 300-nm SiO2 insulating layer. The thickness of the MoS2 layers was identified by the Raman spectroscopy with a 488-nm-wavelength laser and the atomic force microscope. Ti/Au electrodes were defined by e-beam lithography. The Si substrate is use as the back-gate. From the I-V characteristics of the device, the mobility μ = 0.2 cm2V-1s-1, on/off ratio>10000, threshold voltage Vth= 6.87 V, and transconductance gm = 0.013 μS for a device with channel width of 2.2μm, channel length of 0.8μm, and film thickness of 17.3nm. We also observed that the MoS2 transistor is also sensitive with light.
Chang, Lun-Wei, and 張倫瑋. "Electrical measurement of one-dimensional carbon nanotube." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/57998484359936320095.
Повний текст джерела