Dissertations / Theses on the topic 'The current-voltage characteristic'
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Lochner, Georg Philip. "The voltage-current characteristic of the human skin." Pretoria : [s.n.], 2005. http://upetd.up.ac.za/thesis/available/etd-09212005-093111/.
Full textHurtig, Tomas. "Dynamics of the Current-Voltage Characteristic and the Potential in a Triple Plasma Machine." Thesis, KTH, Alfvénlaboratoriet, 1997. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-39337.
Full textГринько, Д. О., Д. О. Гринько, D. O. Grynko, О. П. Дмитриев, О. П. Дмитриев, O. P. Dimitriev, П. С. Смертенко, et al. "Injection Spectroscopy of Deep Traps in Nanostructured Films of Cadmium Sulfide." Thesis, Sumy State University Publishing, 2013. http://essuir.sumdu.edu.ua/handle/123456789/33901.
Full textGrynko, D. O., O. P. Dimitriev, P. S. Smertenko, O. M. Fedoryak, Анатолій Сергійович Опанасюк, Анатолий Сергеевич Опанасюк, Anatolii Serhiiovych Opanasiuk, et al. "Injection Spectroscopy of Deep Traps in Nanostructured Films of Cadmium Sulfide." Thesis, Sumy State University, 2013. http://essuir.sumdu.edu.ua/handle/123456789/35240.
Full textSvrček, Milan. "Metody pro dosažení maximálního výkonu FV modulů." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2017. http://www.nusl.cz/ntk/nusl-318171.
Full textAlkan, Cemil. "Synthesis, Characterization And Electrical Properties Of Diazophenylene And Diazodiphenylene Bridged Co, Ni, Cu, Ce, And Er Phthalocyanine Polymers." Phd thesis, METU, 2004. http://etd.lib.metu.edu.tr/upload/2/12605362/index.pdf.
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z September 2004, 112 pages In this research, diazophenylene and diazodiphenylene bridged metal-phthalocyanine polymers were produced from diazonium salt of diaminophenylene/bensidin and pre-synthesized tetraamino metal phthalocyanines. Tetraamino metal phthalocyanine complexes of Co, Ni, Cu, Ce, and Er were obtained by reducing tetranitro metal phthalocyanine complexes synthesized from 3-nitrophthalic anhydride, urea, metal salt, and ammonium molybdate catalyst. Complexes and polymers were characterized by Fourier Transform Infrared Radiation (FTIR) and UV-Visible spectroscopies. X-Ray analysis showed that there were short range orientations in the polymers. Thermal analysis of the complexes and the polymers were done by differential scanning calorimetry and thermal gravimetric analysis at a heating rate of 10&
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1 under nitrogen atmosphere. Ash analysis was performed to determine the metal content of the polymers. Viscosity and ebullioscopy measurements of the soluble part of the polymers were carried out in THF at 25&
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C. Scanning electron microscopy were used for morphology investigations of the polymers. Four probe conductivity measurements showed that electrical conductivity of the polymers increased according to the metallic conductivity of the metal at the center of the phthalocyanine units. When doped with iodine, the polymer samples showed 104 fold increase in their conductivities. Current-Voltage (I-V) measurements showed that the polymers were optically sensitive and semiconductors. Electrochemical analysis of the soluble part of the polymers were determined in tributylamine perchlorite+dichloromethane mixture utilizing cyclic voltammetry (CV).
Шевченко, Сергій Юрійович. "Вплив вищих гармонік напруги на вибір та експлуатацію обмежувачів перенапруг для захисту систем електропостачання." Thesis, НТУ "ХПІ", 2015. http://repository.kpi.kharkov.ua/handle/KhPI-Press/18478.
Full textThe thesis for the degree of doctor of technical sciences, specialty 05.09.03 - Electrotechnical complexes and systems. - National Technical University "Kharkiv Polytechnic Institute". Kharkov 2015. Dissertation is devoted to actual scientific and technical problem of determining the effect of the higher harmonics of the voltage on the selection and exploitation of surge arresters for protection electricity supply systems is important and enhances the efficiency and reliability of power supply systems. In this area, the following results. The analysis of existing requirements for the selection and exploitation of surge arresters in electricity supply systems of different voltage classes. Experimental studies of electrophysical characteristics of varistors and surge arresters assembled the world's leading manufacturers in the different frequencies of the applied voltage and current voltage characteristics of varistors and surge arresters in an assembled state in the area of leakage current. Іmproved the mathematical model for selecting the energy characteristics of the arrester at a low power quality in the power supply system on the basis of equivalent circuits in the area of the arrester leakage current of the current-voltage characteristics (CVC). Offered the method for determination of active power losses in the arrester on the basis of the obtained current-voltage characteristics in the area of leakage current and the analysis of the impact of non-sinusoidal voltage to the amount of energy exerted on surge arresters, as well as determined the effect of the normal operation of surge arresters Surge lightning and switching current pulses and high frequency voltage. Developed the methods for determining the current-voltage characteristics in the area of the arrester leakage current on the basis of the experimental CVC arresters based on neural networks and approximation CVC two curves of the first order. Іmproved the mathematical model of thermal modes of surge arresters in low power quality in the power supply system and to study the effect of different factors on the thermal stability of the arrester. Experimentally investigated for poor quality of electricity supply systems of various types of industry of Ukraine; An improved method for selecting surge arresters in power supply systems of different rated voltages with low quality electric energy. Іmproved the basic principles for the use and operation of surge arresters under the influence of higher harmonic voltage. Justify the use of thermal imagers and pyrometers for operational monitoring of the arrester.
Шевченко, Сергій Юрійович. "Вплив вищих гармонік напруги на вибір та експлуатацію обмежувачів перенапруг для захисту систем електропостачання." Thesis, НТУ "ХПІ", 2015. http://repository.kpi.kharkov.ua/handle/KhPI-Press/18479.
Full textThe thesis for the degree of doctor of technical sciences, specialty 05.09.03 - Electrotechnical complexes and systems. - National Technical University "Kharkiv Polytechnic Institute". Kharkov 2015. Dissertation is devoted to actual scientific and technical problem of determining the effect of the higher harmonics of the voltage on the selection and exploitation of surge arresters for protection electricity supply systems is important and enhances the efficiency and reliability of power supply systems. In this area, the following results. The analysis of existing requirements for the selection and exploitation of surge arresters in electricity supply systems of different voltage classes. Experimental studies of electrophysical characteristics of varistors and surge arresters assembled the world's leading manufacturers in the different frequencies of the applied voltage and current voltage characteristics of varistors and surge arresters in an assembled state in the area of leakage current. Іmproved the mathematical model for selecting the energy characteristics of the arrester at a low power quality in the power supply system on the basis of equivalent circuits in the area of the arrester leakage current of the current-voltage characteristics (CVC). Offered the method for determination of active power losses in the arrester on the basis of the obtained current-voltage characteristics in the area of leakage current and the analysis of the impact of non-sinusoidal voltage to the amount of energy exerted on surge arresters, as well as determined the effect of the normal operation of surge arresters Surge lightning and switching current pulses and high frequency voltage. Developed the methods for determining the current-voltage characteristics in the area of the arrester leakage current on the basis of the experimental CVC arresters based on neural networks and approximation CVC two curves of the first order. Іmproved the mathematical model of thermal modes of surge arresters in low power quality in the power supply system and to study the effect of different factors on the thermal stability of the arrester. Experimentally investigated for poor quality of electricity supply systems of various types of industry of Ukraine; An improved method for selecting surge arresters in power supply systems of different rated voltages with low quality electric energy. Іmproved the basic principles for the use and operation of surge arresters under the influence of higher harmonic voltage. Justify the use of thermal imagers and pyrometers for operational monitoring of the arrester.
Achenbach, Sven. "Beiträge zur analytischen Berechnung und Reduktion der aus Netzspannungsunsymmetrien resultierenden Harmonischen in Systemen der Hochspannungs-Gleichstrom-Übertragung." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2010. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-38968.
Full textŠpinar, Marek. "Ověření provozní výkonnosti a optimalizace FVE." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2016. http://www.nusl.cz/ntk/nusl-241950.
Full textБожко, Костянтин Михайлович. "Вдосконалення методів та засобів контролю дефектів фотоелектричних сонячних батарей." Thesis, НТУУ "КПІ", 2016. https://ela.kpi.ua/handle/123456789/17647.
Full textDissertation is devoted to the improvement of the methods and means of controlling the defects of photovoltaic solar cells, which are excited by the flow of dark current, and reduce measurement error of current-voltage characteristics of the solar cells. A method for dynamic measurement of current-voltage characteristics of photovoltaic solar cells based on linear current scanning, which is different from the analog expanded by 50% of the current range, increased 10-fold speed, a decrease of 10 times the release of Joule heat and a decrease in the relative error of 10%. A mathematical model of dynamic measuring current-voltage characteristics, which allows you to design a linear scanning device current with the specified parameters, and improved mathematical model of signal filtering, use of which is to compensate for high-frequency oscillations in the measuring circuit of photovoltaic solar panels. The method of heating the photovoltaic solar cells reverse dark current for controlling defects at an early stage of development and improved method of infrared thermography to measure the thermal conductivity of the adhesive joints, which provided a reduction of error of up to 5% at steady-state heat transfer. Improved mathematical model method TV control defects of photovoltaic solar panels, the use of which allows the design of measuring brightness and geometrical characteristics of electroluminescent defects. Designed and manufactured laboratory benches for control of photovoltaic solar cells : Dynamic measuring current-voltage characteristics with a power range from 1 to 300 W and the relative error of voltage measurement 1 % ; TV control electroluminescent defects , which can measure the geometric dimensions of the defects with an accuracy of 5 % . The results are incorporated in the measurement technology of the current- voltage characteristics of photovoltaic solar panels at their operation .
Диссертация посвящена совершенствованию методов и средств контроля дефектов фотоэлектрических солнечных батарей, которые возбуждаются при протекании темнового тока, и уменьшению погрешности измерения вольт-амперных характеристик солнечных батарей. Предложен метод динамического измерения вольт-амперной характеристики фотоэлектрических солнечных батарей на основе линейной развертки тока, который отличается от аналогов расширенным на 50% диапазоном тока, повышенным в 10 раз быстродействием, уменьшением в 10 раз выделения джоулева тепла и уменьшением погрешности на 10%. Создана математическая модель динамического измерения вольт-амперной характеристики, которая позволяет проектировать устройства линейной развертки тока с заданными параметрами, также усовершенствована математическая модель фильтрации сигнала, применение которой позволяет компенсировать высокочастотные колебания в измерительной цепи фотоэлектрических солнечных батарей. Предложен метод нагрева фотоэлектрических солнечных батарей обратным темновым током для контроля дефектов на ранней стадии развития и усовершенствован метод инфракрасной термографии для измерения коэффициента теплопроводности клеевых соединений, который обеспечил уменьшение погрешности до 5% при стационарном теплообмене. Усовершенствована математическая модель метода телевизионного контроля дефектов фотоэлектрических солнечных батарей, применение которой позволяет проектировать средства измерения яркостных и геометрических характеристик электролюминесцентных дефектов. Разработаны и изготовлены лабораторные стенды для контроля фотоэлектрических солнечных батарей: динамического измерения вольт-амперных характеристик с диапазоном мощности от 1 до 300 Вт и относительной погрешностью измерения напряжения 1%; телевизионного контроля электролюминесцентных дефектов, который позволяет измерять геометрические размеры дефектов с погрешностью 5%. Полученные результаты внедрены в технологию измерения вольт-амперных характеристик фотоэлектрических солнечных батарей при их эксплуатации.
Ren, Huilin. "Current Voltage Characteristics of a Semiconductor Metal Oxide Sensor." Fogler Library, University of Maine, 2001. http://www.library.umaine.edu/theses/pdf/RenH2001.pdf.
Full textHrycík, Tomáš. "Porovnání použití přístrojových transformátorů a senzorů v aplikacích s ochranou REF 542plus." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2010. http://www.nusl.cz/ntk/nusl-218429.
Full textHrabal, Michal. "Nové diketopyrrolopyrroly pro organickou fotovoltaiku." Master's thesis, Vysoké učení technické v Brně. Fakulta chemická, 2013. http://www.nusl.cz/ntk/nusl-216971.
Full textMutsuura, Keita, Hirotaka Shimizu, Yasunobu Yokomizu, and Toshiro Matsumura. "Flux flow resistance in Bi2223 generated by pulse currents." IEEE, 2005. http://hdl.handle.net/2237/6789.
Full textBabaev, A. A., P. P. Khokhlachev, Yu A. Nikolaev, E. I. Terukov, A. B. Freidin, R. A. Filippov, A. K. Filippov, and N. K. Manabaev. "Temperature Dependence of Resistivity and Current-Voltage Characteristics of the Films of Composites Based on Modified Carbon Multiwalled Nanotubes and Graphite." Thesis, Sumy State University, 2013. http://essuir.sumdu.edu.ua/handle/123456789/35160.
Full textFranchi, Jimmy. "Investigation of the electronicstructures of single molecularjunctions from current voltage characteristics." Thesis, KTH, Skolan för informations- och kommunikationsteknik (ICT), 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-129288.
Full textSosnowski, J. "Influence of Nano-defects on Current-voltage Characteristics of HTc Superconductors." Thesis, Sumy State University, 2013. http://essuir.sumdu.edu.ua/handle/123456789/35112.
Full textCipín, Radoslav. "Matematické modely transformátorů a asynchronních motorů." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2008. http://www.nusl.cz/ntk/nusl-217586.
Full textKondo, Takeshi. "Current-voltage characteristics of organic semiconductors interfacial control between organic layers and electrodes /." Diss., Available online, Georgia Institute of Technology, 2007, 2007. http://etd.gatech.edu/theses/available/etd-05022007-122219/.
Full textDr. Marder Seth R, Committee Chair ; Dr. Kippelen Bernard, Committee Co-Chair ; Dr. Brďas Jean-Luc E, Committee Member ; Dr. Perry Joseph W, Committee Member ; Dr. Srinivasarao Mohan, Committee Member.
Skatkov, L. I., V. P. Gomozov, and S. G. Deribo. "Role of metal impurities in generation of defects in anodic layers of Nb₂O₅." Thesis, Institute of electrochemistry and energy systems "Academician Evgeni Budevski", 2015. http://repository.kpi.kharkov.ua/handle/KhPI-Press/45463.
Full textNightingale, Wendy Denise. "Electrical characteristics if an identified insect motoneurone cell body : a current- and voltage-clamp." Thesis, University of St Andrews, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.329911.
Full textShah, Syed Arif Ullah. "The impacts of series compensated EHV lines on distance protection, and a proposed new mitigation solution." Thesis, KTH, Elektroteknisk teori och konstruktion, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-209916.
Full textSeriekompensation tillämpas i stor utsträckning på överföringsledningarna för att öka överföringsförmågan hos överföringsledningar, minska överföringsförluster, förbättra spänningsprofiler och förbättra effektdämpning och övergående stabilitet hos elsystem. Men det ändrar transmissionslinjernas uppenbara impedans under felförhållanden och kan orsaka att distansskydd för överföringsledningarna stöter på diskrimineringsproblem och uppnår problem. Den icke-linjära egenskapen hos metalloxidvaristor i seriekompensationsmodell skapar ytterligare komplexitet för felanalysen och kan påverka prestandan hos konventionella distansskyddssystem. Distansskydd problemen i seriekompenserade linjer måste lösas för en pålitlig och hållbar drift av elsystemet. De riktningsdiskrimineringsproblem som är relaterade till det aktuella inversions- och spänningsinversionsfenomenet och uppnår problem relaterade till subsynkron oscillationsfenomen tas upp i denna avhandlingsrapport. Denna rapport syftar till att analysera effekterna av seriekompensation för prestanda hos konventionella distansreläer och föreslår en ny skyddslösning för att mildra bristerna i distansreläerna i seriekompenserade linjer. Den föreslagna nya skyddslösningen innefattar: Ny utlösningskaraktäristik för fyrsidig distansreläer för att klara avståndet med stillastående / räckvidden på grund av ström- eller spänningsinversion och en ny högpassfiltreringsteknik för hantering av övergående över- Nå problem på grund av SSO. Den föreslagna nya skyddsalgoritmen har utvecklats i MATLAB. Utförandet av den nya skyddsalgoritmen utvärderas genom simulering av ett 500 kV två-källa kraftverk med en 200 km serie kompenserad linje i EMTDC / PSCAD (Manitoba Hydro). Den föreslagna nya skyddslösningen har visat sig vara fördelaktig.
Nightingale, Wendy Denise. "Electrical characteristics of an identified insect motoneurone cell body : a current- and voltage-clamp study." Thesis, University of St Andrews, 1989. http://hdl.handle.net/10023/14077.
Full textBorzdov, A. V., V. M. Borzdov, D. V. Pozdnyakov, and F. F. Komarov. "Influence of Impact Ionization Process on Current-Voltage Characteristics of Nanoscale Silicon n-Channel MOSFET." Thesis, Sumy State University, 2013. http://essuir.sumdu.edu.ua/handle/123456789/35371.
Full textLee, Heejae. "Analysis of Current-Voltage Hysteresis and Ageing Characteristics for CH3NH3PbI3-xClxBased Perovskite Thin Film Solar Cells." Thesis, Université Paris-Saclay (ComUE), 2018. http://www.theses.fr/2018SACLX009/document.
Full textOrganic-inorganic lead halide perovskites are very promising materials for the next generation of solar cells with intrinsic advantages such as a low-cost material due to the availability of source materials and low-temperature solution processing as well as a high power conversion efficiency of the sunlight. However, perovskite solar cells are still unstable and show deleterious current-voltage hysteresis effects. Inthis thesis, analyses of CH3NH3PbI3-xClx based perovskite thin films and solar cells are presented. The electrical transport characteristics and the ageing processes are investigated using different approaches.The synthesis of the halide perovskite materials is optimized in a first step by controlling the deposition conditions such as annealing temperature (80°C) and spinning rate (6000 rpm) in the one step-spin-casted process. CH3NH3PbI3-xClx based perovskite solar cells are then fabricated in the inverted planar structure and characterized optically and electrically in a second step.Direct experimental evidence of the motion of the halide ions under an applied voltage has been observed using glow discharge optical emission spectroscopy (GDOES). Ionic diffusion length of 140 nm and ratio of mobile iodide ions of 65 % have been deduced. It is shown that the current-voltage hysteresis in the dark is strongly affected by the halide migration which causes a substantial screening of the applied electric field. Thus we have found a shift of voltage at zero current (< 0.25 V) and a leakage current (< 0.1 mA/cm2) in the dark versus measurement condition. Through the current-voltage curves as a function of temperature we have identified the freezing temperature of the mobile iodides at 260K. Using the Nernst-Einstein equation we have deduced a value of 0.253 eV for the activation energy of the mobile ions.Finally, the ageing process of the solar cell has been investigated with optical and electrical measurements. We deduced that the ageing process appear at first at the perovskite grain surface and boundaries. The electrical characteristics are degraded through a deterioration of the silver top-electrode due to the diffusion of iodides toward the silver as shown by GDOES analysis
Kia, Arash. "Modeling the effects of many valley electron scattering on the current-voltage characteristics of resonant tunneling diodes /." Thesis, Connect to this title online; UW restricted, 1994. http://hdl.handle.net/1773/6060.
Full textPoláková, Simona. "Příprava perovskitových solárních článků se standardní n-i-p strukturou a jejich optimalizace." Master's thesis, Vysoké učení technické v Brně. Fakulta chemická, 2021. http://www.nusl.cz/ntk/nusl-444539.
Full textTumová, Šárka. "Vliv fotochromního aditiva na optické a elektrické vlastnosti polymerních matric." Master's thesis, Vysoké učení technické v Brně. Fakulta chemická, 2017. http://www.nusl.cz/ntk/nusl-316197.
Full textHills, Romilly D. Y. "Physical properties of graphene nano-devices." Thesis, Loughborough University, 2015. https://dspace.lboro.ac.uk/2134/17993.
Full textModin, Emelie. "Estimating Charging on a Sounding Rocket Experiment Using Plasma Simulation." Thesis, KTH, Skolan för elektroteknik och datavetenskap (EECS), 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-293892.
Full textSyftet med detta projekt är att modellera ström-pänningskaraktäristisk kurvor för olika plasmatillstånd som finns i aktiva auroror. Detta görs genom att simulera laddning på en FFU med en ansluten Langmuir-prob i SPIS. Dessa I-V-kurvor används för att bestämma plasma egenskaperna för aurororna sondraketerna SPIDER-1 och SPIDER- 2 skjöts upp i. I-V kurvorna används också för att bestämma hur plasma parametrarna elektron temperatur, jon temperatur och elektrondensitet samt hur probens geometri påverkar I-V- kurvornas utseende. Resultaten visade att den plasma SPIDER-1 blev uppskjuten i troligen hade nominella förhållanden och att den SPIDER-2 blev uppskjuten i troligtvis hade kallare elektroner. En slutsats om att endast elektron temperaturen påverkar formen på IV- kurvorna kan dras, såväl som slutsatsen att probens geometri inte påverkar formen på IV-kurvorna. Ett annat resultat visar att elektron temperaturen också påverkar ytpotentialen på FFUn. En högre elektron temperatur ger FFUn en mer negativ laddning.
Kandidatexjobb i elektroteknik 2020, KTH, Stockholm
Bauer, Jan [Verfasser], Ralf B. [Akademischer Betreuer] Wehrspohn, Otwin [Akademischer Betreuer] Breitenstein, and Hans-Joachim [Akademischer Betreuer] Möller. "The origins of non-ideal current-voltage characteristics of silicon solar cells / Jan Bauer. Betreuer: Ralf B. Wehrspohn ; Otwin Breitenstein ; Hans-Joachim Möller." Halle, Saale : Universitäts- und Landesbibliothek Sachsen-Anhalt, 2009. http://d-nb.info/1024937062/34.
Full textPozdnyakov, D. V., A. V. Borzdov, and V. M. Borzdov. "Calculation of Current-Voltage Characteristics of the Optimized Triode with a Cold Cathode Based on the Ordered Array of Single-Wall Metallic Carbon Nanotubes." Thesis, Sumy State University, 2013. http://essuir.sumdu.edu.ua/handle/123456789/35361.
Full textДорошенко, Дмитро Юрійович, Дмитрий Юрьевич Дорошенко, Dmytro Yuriiovych Doroshenko, Анатолій Іванович Рубан, Анатолий Иванович Рубан, and Anatolii Ivanovych Ruban. "Исследование вольт-амперных характеристик и квантовой проводимости органических молекул бензол-ди-тиола и ферроцена." Thesis, Сумский государственный университет, 2014. http://essuir.sumdu.edu.ua/handle/123456789/39661.
Full textMaráčková, Lucie. "Studium elektrických a dielektrických vlastností plynových senzorů na bázi iontových kapalin." Master's thesis, Vysoké učení technické v Brně. Fakulta chemická, 2017. http://www.nusl.cz/ntk/nusl-316154.
Full textPospíšil, Jan. "Studium dielektrických vlastností struktur tenkých vrstev organických materiálů." Doctoral thesis, Vysoké učení technické v Brně. Fakulta chemická, 2016. http://www.nusl.cz/ntk/nusl-261290.
Full textMohammadzadeh, Saeideh. "Electronic Transport Properties of Copper and Gold at Atomic Scale." Doctoral thesis, Universitätsbibliothek Chemnitz, 2010. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-qucosa-63427.
Full textIn der vorliegenden Arbeit werden die wesentlichen Faktoren, die die elektronischen Transporteigenschaften von Kontaktstrukturen atomarer Größe aus Kupfer bzw. Gold bestimmen, theoretisch untersucht. Untersuchungsgegenstand ist eine leitfähige Struktur zwischen zwei kristallinen Elektroden. Um Transportberechungen sowohl unter Gleichgewichts- als auch unter Nicht-Gleichgewichts-Bedingungen durchführen zu können, wird die Simulations-Software gDFTB, die auf dem Nicht-Gleichgewichts-Green-funktionenformalismus in Kombination mit der Dichtefunktional-Tight-Binding-Methode beruht, eingesetzt. Die elektronischen Eigenschaften der betrachteten atomaren Drähte werden nur sehr schwach von ihrer kristallinen Orientierung, ihrer Länge und der Elektrodenanordnung beeinflusst. Als effektivster geometrischer Faktor wurde der Leiterquerschnitt gefunden, weil dieser die Anzahl der Leitungskanäle bestimmt. Darüber hinaus werden die erhaltenen Leitfähigkeitsoszillationen und die linearen Strom-Spannungs-Kennlinien erklärt. Für eine detaillierte Analyse des Leitungsmechanismus werden bei den Ein-Atom-Kontakten aus Kupfer und Gold die Übertragungskanäle und ihre Aufspaltung in Atomorbitale betrachtet. Die präsentierten Ergebnisse bieten eine mögliche Erklärung für den Zusammenhang zwischen Leitfähigkeit und geometrischer Struktur. Die Resultate zeigen eine akzeptable Übereinstimmung mit den verfügbaren experimentellen und theoretischen Studien
Festin, Örjan. "On the Zero and Low Field Vortex Dynamics : An Experimental Study of Type-II Superconductors." Doctoral thesis, Uppsala University, Department of Engineering Sciences, 2003. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-3907.
Full textDynamic properties of type-II superconductors have been experimentally studied in zero and low magnetic fields using SQUID magnetometry and I–V measurements.
In zero magnetic field close to the critical temperature, the physical properties of type-II superconductors are dominated by spontaneously created vortices. In three dimensions (3D) such vortices take the form of vortex loops and in two dimensions (2D) as vortex-antivortex pairs.
The 2D vortex dynamics has been probed using mutual inductance and flux noise measurements on YBa2Cu3O7 (YBCO) and MgB2 thin films in zero and low magnetic fields. In such measurements, information about vortex correlations is obtained through a temperature dependent characteristic frequency, below (above) which the vortex movements are uncorrelated (correlated). The results obtained in zero magnetic field indicate that sample heterogeneities influence the vortex physics and hinder the divergence of the vortex-antivortex correlation length.
In low magnetic fields the vortex dynamics is strongly dependent on the applied magnetic field and a power law dependence of the characteristic frequency with respect to the magnetic field is observed. The results indicate that there is a co-existence of thermally and field generated vortices.
The I–V characteristics of untwinned YBCO single crystals show that only a small broadening of the transition region influences the length scale over which the vortex movements are correlated. The dynamic and static critical exponents therefore exhibit values being larger in magnitude as compared to values predicted by relevant theoretical models. The results also suggest that the copper oxide planes in YBCO decouple slightly below the mean field critical temperature and hence, the system has a crossover from 3D to 2D behaviour as the temperature is increased.
From temperature dependent DC-magnetisation measurements performed on untwinned YBCO single crystals in weak applied fields, detailed information about the critical current density and the irreversibility line is obtained.
Mitáčková, Martina. "Studium vlastností tranzistorů s iontovými kapalinami." Master's thesis, Vysoké učení technické v Brně. Fakulta chemická, 2021. http://www.nusl.cz/ntk/nusl-449404.
Full textSutorý, Tomáš. "NOVÉ PRINCIPY CHARAKTERIZACE HRADLOVÝCH KAPACIT PRO SIGMA-DELTA MODULÁTORY." Doctoral thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2009. http://www.nusl.cz/ntk/nusl-233499.
Full textЩербак, Д. С. "Віртуальний лабораторний комплекс з дослідження вольт-амперних характеристик різних типів провідників." Thesis, Сумський державний університет, 2015. http://essuir.sumdu.edu.ua/handle/123456789/43377.
Full textVašíček, Michal. "Diagnostika plazmatu generovaného ve vybraných konfiguracích elektrického výboje v kapalném prostředí." Master's thesis, Vysoké učení technické v Brně. Fakulta chemická, 2014. http://www.nusl.cz/ntk/nusl-217023.
Full textFlorián, Pavel. "Studium elektrických a dielektrických vlastností alkalicky aktivovaných aluminosilikátů se zvýšenou elektrickou vodivostí." Doctoral thesis, Vysoké učení technické v Brně. Fakulta chemická, 2019. http://www.nusl.cz/ntk/nusl-393991.
Full textGorge, Vanessa. "Caractérisations de matériaux et tests de composants des cellules solaires à base des nitrures des éléments III-V." Phd thesis, Université Paris Sud - Paris XI, 2012. http://tel.archives-ouvertes.fr/tel-00707717.
Full textPospíšil, Jan. "Studium optoelektrických vlastností tenkých vrstev organických polovodičů." Master's thesis, Vysoké učení technické v Brně. Fakulta chemická, 2012. http://www.nusl.cz/ntk/nusl-216901.
Full textCarbonell, Cortés Carla. "Customizing a low temperature system for microwave transmission measurements. Quantum transport in thin TiN films and nanostructures." Doctoral thesis, Universitat de Barcelona, 2012. http://hdl.handle.net/10803/83635.
Full textEl treball que es presenta en aquesta tesi consta de dues parts ben diferenciades. La primera pretén el desenvolupament d’un equip experimental concebut per a l’estudi de propietats magnètiques i elèctriques en materials diversos i, en especial, el treball amb radiació de microones en condicions de reflexió i transmissió. La segona s’ha centrat en les mesures de transport d’una capa fina superconductora de nitrur de titani (TiN) de 5 nm de gruix en un criòstat de dilució.
Ahmed, Mustafa M. Abdalla. "Alternating-Current Thin-Film Electroluminescent Device Characterization." Doctoral thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2008. http://www.nusl.cz/ntk/nusl-233432.
Full textDubois, Diane. "Réalisation et caractérisation d'un réacteur plasma de laboratoire pour des études sur la dépollution des gaz d"échappement." Toulouse 3, 2006. http://www.theses.fr/2006TOU30139.
Full textThe present thesis is devoted to the experimental study of atmospheric positive corona discharges generated in a point to plane corona reactor under DC or pulsed high voltage conditions. The corona discharge characteristics, in particular during “breakdown streamer” mode, are studied according to the high voltage supply conditions (DC or pulsed), the point radius curvature, the gap distance or the gas mixture following the variation of the N2, O2 and CO2 concentration. The dynamics and the morphology of the streamers are also studied using fast imaging (ICCD and Streak cameras) and electrical (oscilloscope) diagnostics on time scale lower than hundred of nanosecond. As the corona discharge reactor dimensions are well adapted, some preliminary results show the comparison between experimental and simulated results which allow us in the future to estimate the localization, the density and the nature of the radical species created during the discharge phase of a corona reactor devoted to air pollution control
Dřímalková, Lucie. "Diagnostika diafragmového výboje ve vodných roztocích a jeho aplikace pro povrchovou úpravu nanomateriálů." Doctoral thesis, Vysoké učení technické v Brně. Fakulta chemická, 2019. http://www.nusl.cz/ntk/nusl-402110.
Full textPokorný, Marek. "Charakterizace vlastností fotovoltaického systému." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2011. http://www.nusl.cz/ntk/nusl-219073.
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