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Dissertations / Theses on the topic 'Clausius cycle'

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Published: 4 June 2021
Last updated: 4 February 2022

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1

Čepl, Ondřej. "Optimalizace Rankineůva-Clausiůva parního cyklu." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2013. http://www.nusl.cz/ntk/nusl-230982.

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This diploma thesis deals with an optimization of Rankine-Clausius steam cycle. The theoretical information about the Optimization and the Rankine-Clausius cycle are described at the beginning of the thesis. These theoretical findings are later used to create simulation models in MATLAB. Individual simulation models are variants of the ideal R-C cycle. Simulation models include the basic cycle model, the supercritical cycle and the cycle with reheat. For these models the optimal configurations are found and their t-s diagrams are plotted.
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2

Přívozník, Martin. "Porovnání tepelných účinností cyklů." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2015. http://www.nusl.cz/ntk/nusl-231805.

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Theme of this master's thesis Comparison of thermal cycle efficiency is aimed on the calculation of thermal schemes of reheating and without reheating for various performances. The calculation is performed using specialized literature. The introduction describes the fundamental thermal cycle used in power plants and Rankine - Clausius cycle. After the initial familiarization with the parameters of Rankine - Clausius cycle follow a section with technical solutions to improve thermal efficiency of Rankine - Clausius thermal cycle. The aim of this work is to identify and compare the thermal efficiency of the thermal cycle with reheating, without reheating and compare them with each other. At the conclusion of this work is shown comparison between two low-pressure regeneration systems.
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3

Pavliska, Vojtěch. "Parní turbína pro pohon napájecího čerpadla." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2020. http://www.nusl.cz/ntk/nusl-417533.

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This diploma thesis performs a calculation of a steam turbine to drive a feed pump. The research part deals with the basic classification of steam turbines focusing on mechanical drive steam turbines. The second part of the thesis is a controlled extraction pressure optimization for achieving the maximum possible thermic efficiency of the cycle. The last part of the thesis shows a detailed thermodynamic calculation of the mechanical drive turbine along with the basic geometric parameters of the flow canal.
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4

Velešík, Aleš. "Stanovení výkonnosti chladicího okruhu - chladící věž." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2015. http://www.nusl.cz/ntk/nusl-232151.

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The aim of this work is to determine the performance and description of the cooling circle in the cooling tower. In order to do that there was applied the linear regression approach in order to create structural empirical model of the cooling tower. The data obtained was analysed through QC expert software, which, if correct data applied, identifies suitable model for specific tower. The models created will be used for diagnostics of the cooling circles and as a comparison tool with other cooling towers in the future. Thus, the findings of this thesis are polynoms, which in thic technological setup characterise the models of the cooling towers.
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5

Staněk, Štěpán. "Paroplynová turbína pro akumulaci energie." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2020. http://www.nusl.cz/ntk/nusl-417553.

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Master thesis discusses the growing need of electric energy storage and its effectivity and capacity. It describes an overview of possible technologies with their advantages and disadvantages. Greater attention is paid to the storage of energy in gas, so-called Power to Gas, which combines the electrolytic production of hydrogen from water and the Sabatier reaction to produce synthetic methane. This technology is introduced in the so-called SIT Brno cycle of Siemens Industrial Turbomachinery company. The main part of the thesis is focused on the description of this cycle and on the calculation of the steam-gas turbine (high-pressure and low pressure module). This thesis describes the methodology of turbine calculation and the composition of the steam gas mixture after combustion of methane. The carbon dioxide formed by combustion in the steam-gas mixture generator was replaced by steam. Part of the diploma thesis are drawings of cross-section of individual turbine modules.
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6

Voseček, Petr. "Optimalizace tepelných oběhů." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2010. http://www.nusl.cz/ntk/nusl-229061.

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The main goal of the thesis was a selection of appropriate thermal cycles for the considerated nuclear power stations with the Generation IV reactors. Characterization and specification of the parametres of the Brayton and the Rankine-Clausi thermodynamic cycle, their optimalization with regard to the parametres of the first cycle was made, than analysis of cycles´properties, mostly efficiency, output and process layout.
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7

Ng'ambi, Patrick K. M. S. "The resource nationalism cycle, stabilization clauses and the need for flexibility in concession agreements." Thesis, University of Leicester, 2015. http://hdl.handle.net/2381/31484.

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Foreign direct investment in the mining and oil industries is invariably fostered through the signing of concession agreements between the host State and the investor. Such concessions may contain fiscal incentives, to encourage the flow of FDI. However, such concessions are also susceptible to alteration by the host State, once the investment has been sunk. This may include increasing taxes or outright nationalization. To avert this, investors will often insist on the insertion of stabilization clauses. These clauses constitute an undertaking on the part of the host State, that they will not take any administrative or legislative action that would adversely affect the rights of the investor. Such clauses are well recognized by arbitral tribunals and the unilateral abrogation of these clauses, will have pecuniary consequences. Not only will the host State have to pay damnum emergens but also lucrum cessans as part of the compensation package to the investor. Such a position promotes efficiency as per the efficient breach theory, by discouraging the State from terminating concession agreements unless they will make some money, even after compensating the investor for lost future profits. However, this ultimately renders stabilization clauses inflexible because they preclude the host State from pursuing legitimate public functions. Such a position, necessitates some form of contractual flexibility. However, the legitimate expectations of the investor also ought to the protected. The means of achieving this balance is by the inserting renegotiation clauses in the concession agreements.
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8

Ng’ambi, Patrick K. M. S. "The resource nationalism cycle, stabilization clauses and the need for flexibility in concession agreements." Thesis, University of Leicester, 2014. http://hdl.handle.net/2381/31484.

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Foreign direct investment in the mining and oil industries is invariably fostered through the signing of concession agreements between the host State and the investor. Such concessions may contain fiscal incentives, to encourage the flow of FDI. However, such concessions are also susceptible to alteration by the host State, once the investment has been sunk. This may include increasing taxes or outright nationalization. To avert this, investors will often insist on the insertion of stabilization clauses. These clauses constitute an undertaking on the part of the host State, that they will not take any administrative or legislative action that would adversely affect the rights of the investor. Such clauses are well recognized by arbitral tribunals and the unilateral abrogation of these clauses, will have pecuniary consequences. Not only will the host State have to pay damnum emergens but also lucrum cessans as part of the compensation package to the investor. Such a position promotes efficiency as per the efficient breach theory, by discouraging the State from terminating concession agreements unless they will make some money, even after compensating the investor for lost future profits. However, this ultimately renders stabilization clauses inflexible because they preclude the host State from pursuing legitimate public functions. Such a position, necessitates some form of contractual flexibility. However, the legitimate expectations of the investor also ought to the protected. The means of achieving this balance is by the inserting renegotiation clauses in the concession agreements.
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9

Xing, Chuanxi [Verfasser], and Inga [Akademischer Betreuer] Hense. "Modelling the life cycle dynamics of Acartia clausi : a key copepod species in the North Sea / Chuanxi Xing. Betreuer: Inga Hense." Hamburg : Staats- und Universitätsbibliothek Hamburg, 2013. http://d-nb.info/1045730408/34.

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10

Verzat, Benoit. "Sustainable Public Procurement : Development and analysis of tools for construction works." Thesis, KTH, Miljöstrategisk analys, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-46340.

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Embedded in the economic competition, public procurement has amajor role to play in being a driving force for the promotion of a globallypositive competition that prides the best sustainable products and services,rather than only the more economically efficient ones. Responsible for ahuge part of the human pressure on natural resources, and having a largeshare in the public funding, the built environment sector provides animportant venue for the use of sustainable public procurement as a tool toenhance the sustainability of societies.Selecting the best sustainable offer is a challenging task requiringenvironmental and social assessments that can only be based on complexlife cycle thinking analysis. Through the development of the “ExhaustiveSustainable public procurement clauses Manual”, this paper analyses publicprocurement issues and their potential solutions, with a focus on theenvironmental performance in buildings procurement.
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11

Zălinescu, Eugen. "Sécurité des protocoles cryptographiques : décidabilité et résultats de transfert." Thesis, Nancy 1, 2007. http://www.theses.fr/2007NAN10144/document.

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Cette thèse se situe dans le cadre de l'analyse symbolique des protocoles Les contributions sont représentées par l'obtention de résultats de décidabilité et de transfert dans les directions suivantes qui sont des thèmes majeurs en vérification des protocoles : - traitement des primitives cryptographiques : chiffrement CBC, signatures en aveugle; - propriétés de sécurité : secret fort, existence de cycles de clefs; - approches pour la sécurité : construction de protocoles sûrs. Ainsi, nous avons montré la décidabilité (d'une part) de l'existence de cycles de clefs et (d'autre part) du secret pour des protocoles utilisant le mode de chiffrement CBC ou des signatures en aveugle. Nous avons aussi transféré la sécurité des protocoles d'un cadre faible vers un cadre plus fort dans les sens suivants. D'une part, nous avons montré qu'une propriété de secret faible implique sous certaines hypothèses une propriété de secret plus forte. D'une autre part, nous avons construit des protocoles sûrs à partir de protocoles ayant des propriétés plus faibles
This thesis is developed in the framework of the symbolic analysis of security protocols. The contributions are represented by decidability and transfer results in the following directions which are major topics in protocol verification: - treatment of the cryptographic primitives: CBC encryption, blind signatures; - security properties: strong secrecy, existence of key cycles; - approaches for protocol security: construction of the secure protocols. Thus, we showed the decidability (on the one hand) of the existence of key cycles for a bounded number of sessions using a generalized constraint system approach, and (on the other hand) of secrecy for protocols using the CBC encryption or blind signatures for an unbounded number of sessions by using a refined resolution strategy on a new fragment of Horn clauses. We also transferred protocol security from a weak framework towards a stronger framework in the following directions. On the one hand, we showed that a weak property of secrecy (i.e. reachability-based secrecy) implies under certain well-motivated assumptions a stronger secrecy property (i.e. equivalence-based secrecy). On the other hand, we built protocols secure against active adversaries considering an unbounded number of sessions, by transforming protocols which are secure in a non-adversarial setting
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12

Khůlová, Jitka. "Topné výměníky, vliv zapojení na účinnost cyklu." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2019. http://www.nusl.cz/ntk/nusl-400503.

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The master's thesis deals with district heat exchangers in a thermal steam cycle of combined heat and power plants and with types of condensate cascades in the multilevel heating systems. Calculation of the thermal efficiency of electricity generation is provided for the investigated thermal cycle, which was modified for three different types of cascades. Besides that, a comparison of useful electric power and electricity generation through one year period of working is made. A significant part of the work is devoted to the design of district heat exchangers, including the calculation of thermal power and heat transfer area. Main dimensions are proposed for each exchanger together with a basic drawing.
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13

Netopilová, Petra. "Systémy přeměn energie pro jaderné elektrárny se sodíkem chlazeným reaktorem (SFR)." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2011. http://www.nusl.cz/ntk/nusl-229737.

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The aim of the dissertation is proposing and solving energy convection systems for nuc-lear power plants with a sodium fast reactor of the 4th generation. The first part of the dissertation deals with collection and evaluation of information available about nuclear power plants with sodium fast reactor which use nuclear or non-nuclear reheating to increase thermal efficiency. On the basis of the acquired information, thermal schemes are developed and thermal effi-ciency is determined for the systems working in both Rankine thermal cycle and Brayton thermal cycle. In the further part of the dissertation thermal calculation of the reheater for nuclear and non-nuclear reheating is made for the systems working in Rankine thermal cycle. At the end of this dissertation, an apparatus suitable for these systems is suggested and the systems are evaluated in terms of technical implementation and nuclear safety.
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14

Joska, Jakub. "Charakteristiky ventilátorových chladicích věží." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2021. http://www.nusl.cz/ntk/nusl-443198.

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This diploma thesis deals with the problematics of fan cooling towers. The very first part of the text is research, focusing mainly on the theory of cooling and the function of fan cooling towers in general. The following chapter deals with the water resource management of the Dukovany nuclear power plant and the specification of its objects of forced draft cooling towers. The second part describes a computational model created to determine the cooling performance of these towers under the given input conditions. In the following chapters, the results from the computational model are compared with the available data from warranty measurements and with the provided characteristics. The final pages deal with the study of the influence of changes in input parameters on the cooling performance and the research of the behavior of the cooling towers under extreme weather conditions.
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15

Kantor, Radek. "Aplikační případy využití zkapalněného zemního plynu." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2019. http://www.nusl.cz/ntk/nusl-401563.

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16

Zalinescu, Eugen. "Sécurité des protocoles cryptographiques : décidabilité et résultats de transfert." Phd thesis, Université Henri Poincaré - Nancy I, 2007. http://tel.archives-ouvertes.fr/tel-00338362.

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Cette thèse se situe dans le cadre de l'analyse symbolique des protocoles Les contributions sont représentées par l'obtention de résultats de décidabilité et de transfert dans les directions suivantes qui sont des thèmes majeurs en vérification des protocoles :
  • traitement des primitives cryptographiques : chiffrement CBC, signatures en aveugle;
  • propriétés de sécurité : secret fort, existence de cycles de clefs;
  • approches pour la sécurité : construction de protocoles sûrs.
Ainsi, nous avons montré la décidabilité (d'une part) de l'existence de cycles de clefs et (d'autre part) du secret pour des protocoles utilisant le mode de chiffrement CBC ou des signatures en aveugle. Nous avons aussi transféré la sécurité des protocoles d'un cadre faible vers un cadre plus fort dans les sens suivants. D'une part, nous avons montré qu'une propriété de secret faible implique sous certaines hypothèses une propriété de secret plus forte. D'une autre part, nous avons construit des protocoles sûrs à partir de protocoles ayant des propriétés plus faibles.
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17

Bengtsson, Berit. "Kampen mot § 23 : Facklig makt vid anställning och avsked i Sverige före 1940." Doctoral thesis, Uppsala University, Department of Economic History, 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-6318.

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The aim of this thesis is to use a power perspective to describe the workers’ struggle for co-determination in the Swedish labour market during the period 1890–1939. The study explores how trade unions in general attempted to limit article 23, which asserted employers’ control over hiring and dismissal. At the same time the study clarifies differences in union power between various groups of workers. The prevalent historical view regarding the distribution of power in the labour market is thus questioned.

The study shows that workers were not powerless before the Saltsjöbaden agreement in 1938. In certain areas workers, through their unions, already at the beginning of the 20th century had fairly good possibilities of influencing both hiring and dismissal. Collective agreements that were entered into before the defeat of the workers in the great conflict in the Swedish labour market in 1909, as well as collective agreements signed during the 1920s and 1930s, can make both the Saltsjöbaden agreement and present-day regulations look “hostile to workers”. In collective agreements workers achieved considerable limitations of employers’ arbitrary freedom to hire and dismiss workers. Certain unions could control their labour market efficiently by means of a labour exchange of their own. The development, however, varied over time and between different trade unions. Business cycles generally influenced how much power unions could exert. Access to power resources and other conditions varied between different workers’ groups. While some attained considerable power over hiring and dismissal, others had no possibilities of taking part in decision-making.

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