Dissertations / Theses on the topic 'Discharge chamber'
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Mahalingam, Sudhakar. "Particle Based Plasma Simulation for an Ion Engine Discharge Chamber." Wright State University / OhioLINK, 2007. http://rave.ohiolink.edu/etdc/view?acc_num=wright1198181910.
Full textTran, Binh Phuoc. "Modeling of Ion Thruster Discharge Chamber Using 3D Particle-In-Cell Monte-Carlo-Collision Method." Thesis, Virginia Tech, 2005. http://hdl.handle.net/10919/33510.
Full textMaster of Science
Macquisten, M. A. "The pulsed electric discharge as an acoustic probe for combustion chamber diagnostics." Thesis, London South Bank University, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.373899.
Full textGruber, J. R. "A study of erosion due to low-energy sputtering in the discharge chamber of the Kaufman ion thruster." Thesis, University of Oxford, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.249396.
Full textTomashevskyi, Roman, Viacheslav Kulichenko, and Nikolay Mahonin. "System for Flow Rate Regulation with Pulse-Width Modulation." Thesis, Kyiv polytechnic institute, 2014. http://repository.kpi.kharkov.ua/handle/KhPI-Press/7880.
Full textDeisting, Alexander [Verfasser], and Silvia [Akademischer Betreuer] Masciocchi. "Measurements of ion mobility and GEM discharge studies for the upgrade of the ALICE time projection chamber / Alexander Deisting ; Betreuer: Silvia Masciocchi." Heidelberg : Universitätsbibliothek Heidelberg, 2018. http://d-nb.info/1177384647/34.
Full textPenkal, Bryan James. "Steps in the Development of a Full Particle-in-Cell, Monte Carlo Simulation of the Plasma in the Discharge Chamber of an Ion Engine." Wright State University / OhioLINK, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=wright1367586856.
Full textМахонін, Микола Віталійович. "Метод визначення параметрів генератору медичного озону для ефективного підвищення його продуктивності." Thesis, Національний технічний університет "Харківський політехнічний інститут", 2019. http://repository.kpi.kharkov.ua/handle/KhPI-Press/42015.
Full textThesis for the degree of candidate of technical sciences (PhD) in the specialty 05.11.17 “Biological and medical devices and systems”. -National Technical University "Kharkov Polytechnic Institute", Kharkov, 2019. The thesis is devoted to the solution of one of the current scientific and technical problems of modern medical instrument making - increasing the efficiency of the medical ozone generator by determining the parameters of the discharge chamber, the supply voltage and the oxygen consumption. Currently, ozone and its mixtures are widely used in the world for the wide range of applications. Different types of ozone generators depending on their application are used for ozone synthesis. These generators differ in size, the amount of ozone generated by the time span, etc. The peculiarity of the generators of medical ozone is that it is necessary to maintain the prescribed parameters of the resulting ozone-oxygen mixture throughout the entire duration of the procedure, and medical oxygen is used as the working gas. This allows us to implement ozone therapy techniques for the most effective treatment of patients. Typical parameters of the ozone-oxygen mixture, which the ozone generating plant should provide, are regulated in Ukraine "Methods for the application of ozone in medical practice", which were approved by the Ministry of Health in 2004. According to the modern version of these methods, the concentration of ozone in the ozone-oxygen mixture should vary in the range from 0.1 to 80 mg / l, and the flow rate of the mixture is from 0.1 to 1 l / min. Medical ozone generators are actively used in the offices of ozonotherapy and medical institutions in Ukraine, CIS countries, as well as Latin American countries. A large number of conferences devoted to ozone therapy are being held annually in the world in which it is further developed. The practical use of generators of medical ozone shows that most of the equipment used needs to be improved to provide work on the basis of modern medical solutions in treatment. That is, the development of a modern generator requires not only compliance with the parameters of modern requirements, but also a stock for development and the possibility of increasing the values of ozone concentration. In addition, in most medical ozone generators there is a discrepancy between the stated parameters of the ozone oxygen mixture and the value of ozone productivity. The performance of the ozone generator, in turn, depends on: the parameters of the discharge chamber, the parameters of the supply voltage, the parameters of the working gas. Many scientists, including Japanese, German and scholars from the CIS countries, are engaged in solving the problem of finding the optimal values of these parameters for increasing the efficiency of ozone generator operation. But at the moment there is still no universal model for calculating the parameters of the ozone generator. Thus, the task of increasing the efficiency of the medical ozone generator by determining the best parameters of its nodes, which will improve the quality of ozone therapy procedures, is an urgent and promising direction for the development of ozone generators. In the dissertation, for the first time, a mathematical model of the synthesis of ozone in a digital chamber of the medical ozone generator was constructed, which takes into account the influence not only of the parameters of electric energy, but also of the parameters of the discharge chamber and the working gas. The dependence of the influence of electric energy parameters on the synthesis of ozone in a discharge chamber was obtained on the basis of the conducted analysis and using computer simulation. The model of the ozone generation process in the barrier discharge has been further developed, which, in contrast to the existing one, takes into account not only the power supply parameters and camera dimensions, but also the processes occurring in the discharge gap. The method of calculation of the basic parameters of the ozone generator during its development, which allows increasing the efficiency of ozone synthesis, is proposed. The practical value of the results obtained is to justify the list of parameters that have the greatest impact on the performance of the medical ozone generator; engineering calculations of parameters of the generator of medical ozone, which allowed to optimize the design of the generator with the given parameters; the implementation of an experimental model of the medical ozone generator with an improved system of automatic regulation of gas consumption, which allowed to ensure the implementation of a wide range of procedures for ozone therapy. The practical results of the dissertation work were introduced at the Scientific-Production Enterprise "Econika" in the development and manufacture of modern generators of medical ozone, and also a prototype sample was developed, was tested at the medical center "Pulse Medika" and at the Institute of Medical Radiology N.A. Grigoriev.
Galli, Giacomo. "Etude des décharges partielles dans une chambre à fission haute température." Thesis, Université Paris-Saclay (ComUE), 2018. http://www.theses.fr/2018SACLC109/document.
Full textThe Commission for Atomic and Alternative Energy (CEA) is in charge of the fourth generation fast neutron reactor design. The instrumentation for neutron flux measurement of this future reactor will be based on fission chambers placed in-core. These high temperature fission chambers (HTFC) will have to operate at full reactor power, and thus at a temperature between 400°C and 650°C.A recent review of HTFC technology has revealed that some points need improvement to ensure greater reliability.In particular, a better understanding of the phenomenon of partial discharges (PD), which are observed in the fission chambers at high temperature, is needed. These PD pulses are indistinguishable from those produced by the products of fission caused by collision with neutrons with the fissile deposit within thechambers.In addition, they could accelerate aging of the ceramic insulators used in the chambers.Based on both experimental and theoretical approaches, this PhD work found several results.Tests on different fission chambers made it possible to characterize the DP signals vis-a-vis the neutron signals and to find an operational DP-neutron discrimination method. The DP signals were localized and a technological solution was proposed and successfully implemented to eliminate them.A calculation tool for neutron pulse simulation was also designed and tested successfully.An experiment on the effect of temperature on the Paschen curve, in a closed gas volume, was designed and carried out giving initial interesting results
Махонін, Микола Віталійович. "Метод визначення параметрів генератору медичного озону для ефективного підвищення його продуктивності." Thesis, Національний технічний університет "Харківський політехнічний інститут", 2019. http://repository.kpi.kharkov.ua/handle/KhPI-Press/42014.
Full textThesis for the degree of candidate of technical sciences in specialty 05.11.17 – biological and medical devices and systems. – National Technical University "Kharkіv Polytechnic Institute", Kharkіv, 2019. The thesis is devoted to the development of a method for determining the parameters of a medical ozone generator to effectively increase its productivity by determining the parameters of its constituent parts, taking into account the influence of factors of different nature. On the basis of the study of the issues of constructing generators of medical ozone, the relevance of the study of ways to increase its efficiency was proved. A mathematical model based on the use of a single volume, which describes the processes occurring in the discharge chamber when the voltage is applied, is proposed. The level of influence of the parameters of the working gas and the geometry of the discharge chamber on the performance of the ozone generator, as well as on the stability of the parameters of the ozone-oxygen mixture, which were set. A method has been developed for calculating the parameters of a discharge chamber of a medical ozone generator, which makes it possible to obtain the most efficient design for given operating modes. A study has been carried out on the development of an automated working gas consumption system with improved characteristics, which makes it possible to carry out the main methods of ozone therapy. The efficiency of this system has been proved on the basis of the work of a medical ozone generator layout during the passage of medical approbation.
Duque, Jose Luis Gerardo Ramirez. "Modelagem e simulação de uma bomba multifásica de duplo parafuso com recirculação interna." Universidade de São Paulo, 2016. http://www.teses.usp.br/teses/disponiveis/3/3150/tde-09122016-104642/.
Full textThe increasing requirements about the performance of multiphase pumping systems combined with those related to a higher operational availability of such systems, as well as future operating conditions with pressure increase at about 150 bar, highlights the importance of developing accurate mathematical models to predict the performance behavior of these equipments. In this thesis it was improved the thermo-hydraulic behavior of a twin screw multiphase pump developed by Nakashima (2005), and were included the effects of the gradual opening of the last chamber, fluid recirculation between suction and discharge of the pump, heat transfer though the liner, thermal expansion and different working fluids (water-air and oil-gas). Giving pump geometry and operational conditions, it is possible to calculate the most important pump parameters performance, such as, volumetric efficiency, suction flow, back-flow, power consumption and pressure and temperature distribution. The model equations were developed based on mass and energy balances in the chambers taking into account the pump geometry and the clearance variation due to operation. Its implementation was made in C++. The results obtained by the new model were compared with experimental data of the bibliography, and a good accuracy was found in it with values till 95% GVF for the studied cases, with and without recirculation technology. Due to the physical phenomenon complexity related with the pump operation, the impact of each effect in the model calculations was evaluated and discussed separately. So, it was demonstrated the importance of the recirculation, the gradual opening of the last chamber and the thermal expansion in the calculation of the most important pump operation parameters. However, the heat transfer can be neglected, because its value is very low when compared with the pump power supply, and therefore, it does not influence the energy balances that determine thermodynamic state in the chambers. However, this effect is necessary to calculate the temperature distribution along the pump and the thermal expansion in the screws and the liner.
Yokomizu, Yasunobu, Toshiro Matsumura, Akiji Matsuda, and Hideyuki Ohno. "Dependence of arc interrupting capability on spatial distribution of airflow velocity in air-blast flat-type quenching chamber." IEEE, 2003. http://hdl.handle.net/2237/6793.
Full textSmělý, Jiří. "Sací kanály Wankelova motoru." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2017. http://www.nusl.cz/ntk/nusl-318690.
Full textLIMA, IARA B. de. "Medidas do coeficiente de multiplicacao gasosa no isobutano puro." reponame:Repositório Institucional do IPEN, 2010. http://repositorio.ipen.br:8080/xmlui/handle/123456789/9514.
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Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
Dissertacao (Mestrado)
IPEN/D
Instituto de Pesquisas Energeticas e Nucleares - IPEN-CNEN/SP
FAPESP:07/06773-0
PETRI, ANNA R. "Medidas do primeiro coeficiente de Townsend de ionização no isobutano puro submetido a campos elétricos uniformes." reponame:Repositório Institucional do IPEN, 2013. http://repositorio.ipen.br:8080/xmlui/handle/123456789/10198.
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Dissertação (Mestrado)
IPEN/D
Instituto de Pesquisas Energeticas e Nucleares - IPEN-CNEN/SP
Li, Qi. "Acoustic noise emitted from overhead line conductors." Thesis, University of Manchester, 2013. https://www.research.manchester.ac.uk/portal/en/theses/acoustic-noise-emitted-from-overhead-line-conductors(90a5c23c-a7fc-4230-bbab-16b8737b2af2).html.
Full textChen, Po-An, and 陳柏安. "Absorption Spectroscopy of 40Ca+ Ion Generated by Discharge Chamber." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/67887110012269015924.
Full text國立清華大學
物理學系
100
This thesis describes the method of absorption spectroscopy of calcium ions to test our discharge chamber. The discharge chamber has been set up. It contains two conduction plates and a vacuum system in which the vacuum can reach 6.8×〖10〗^(-7) Torr. High-voltage DC and RF power source have been applied to the conduction plates. We attempt to use the 397 nm laser light to excite 40Ca+ ions from the ground state 4S1/2 to the excited state 4P1/2. The 397 nm light is produced by frequency doubling of the 795 nm laser. We use an enhancement cavity with a LBO crystal to increase the efficiency of frequency doubling. The 795 nm external cavity diode laser of power about 25 mW is sent into a tapered amplifier and the final output power of the 795 nm light is about 180 mW. As for the locking system, we demonstrate two laser frequency stabilization systems including the Hansch-Couillaud method and the Pound-Drever-Hall technique. The power of the blue light produced by SHG is about 40 micro watt. In the future, we plan to carry out the saturation absorption spectroscopy of calcium ions in a hollow cathode lamp. The frequency-stabilized laser at 397 nm will be used for laser cooling of trapped calcium ions.
Іванова, Єлизавкта Костянтинівна. "Дослідження способів очистки газів від сірководню в полях високої напруженості." Магістерська робота, 2020. https://dspace.znu.edu.ua/jspui/handle/12345/5003.
Full textUA : Розглянуті найбільш поширені джерела забруднення атмосфери сірководнем та його вплив на навколишнє середовище. Проведено теоретичний аналіз існуючих методів знешкодження газів, що містять сірководень. Проведено експериментальні дослідження з окиснення сірководню електрофізичним методом. Визначені основні параметри що вливають на ефективність протікання процесу очистки та отримана формула залежності кінцевої концентрації сірководню від технологічних параметрів процесу очищення сірководню в полях високої напруженості.
EN : The paper studies the most common sources of atmospheric pollution by hydrogen sulfide. The subject of its impact on the environment was thoroughly examined in all its bearings. Theoretical analysis of existing methods of neutralization of gases, containing hydrogen sulfide, was carried out. The work contains experimental studies on hydrogen sulfide oxidation by electrophysical method. The main parameters influencing the efficiency of the purification process were identified. The formula for the dependence of the final concentration of hydrogen sulfide on the technical parameters of hydrogen sulfide purification in high fields of tension is derived.
Fan, Xingming. "Testing RPC Performance with Discharges Ignited by UV Laser Pulses: Precise Measurement of Gas Parameters in Approximately Realistic RPC Configurations." 2019. https://tud.qucosa.de/id/qucosa%3A38063.
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