Log in

Relevant bibliographies by topics / Linear wear / Dissertations / Theses

To see the other types of publications on this topic, follow the link: Linear wear.

Dissertations / Theses on the topic 'Linear wear'

Author: Grafiati

Published: 28 May 2022

Last updated: 31 July 2025

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles

Select a source type:

Consult the top 50 dissertations / theses for your research on the topic 'Linear wear.'

Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.

You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.

Browse dissertations / theses on a wide variety of disciplines and organise your bibliography correctly.

1

Kolesnichenko, V. G., A. V. Ragulya, V. T. Varchenko, O. B. Zgalat-Lozynskyy, and M. Herrmann. "Wear-Resistant TiN – Si3N4 Nanocomposites Consolidated By Electric Discharge Sintering." Thesis, Sumy State University, 2012. http://essuir.sumdu.edu.ua/handle/123456789/35093.

Full text

Abstract:

Dense nanocomposites on the basis of silicon nitride with the size of structural elements less than 150 nm have been consolidated by Electric Discharge Sintering. The improvement of materials properties is expected: wearproofness, fracture toughness (~ 5 – 6 MPa м1/2), hardness (~ 22 GPа), bend stress (800- 1100 MPа), stability to the aggressive environments (acids at a room and high temperatures) as compared to traditional materials which now use as frictional unit. When you are citing the document, use the following link http://essuir.sumdu.edu.ua/handle/123456789/35093

APA, Harvard, Vancouver, ISO, and other styles

2

Sfantos, Georgios. "Boundary element methods for cohesive-frictional non linear problems : applications to wear, contact and multi-scale damage modelling." Thesis, Imperial College London, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.439265.

Full text

APA, Harvard, Vancouver, ISO, and other styles

3

Postal, Germano Tagliari. "Projeto e fabricação de microtribômetro para análise de juntas soldadas." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2018. http://hdl.handle.net/10183/179571.

Full text

Abstract:

Este trabalho apresenta o desenvolvimento de um microtribômetro linear, do tipo esfera sobre chapa, capaz de analisar o comportamento tribológico de materiais em linhas até 5 mm de comprimento, frequências de até 2 Hz e cargas até 10 N, com ou sem meio úmido, características que o tornam uma ótima ferramenta para observar o comportamento tribológico, ou a resistência ao desgaste de diferentes zonas de uma junta soldada. Durante o projeto do microtribômetro, houve a preocupação de desenvolver um equipamento seguro, fácil de operar e robusto, visando a utilização do mesmo por alunos de graduação

APA, Harvard, Vancouver, ISO, and other styles

4

OLIVEIRA, DENISE DE. "WEAK STABILITY FOR INFINITE DIMENSIONAL LINEAR SYSTEMS." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 1990. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=9384@1.

Full text

Abstract:

CONSELHO NACIONAL DE DESENVOLVIMENTO CIENTÍFICO E TECNOLÓGICO<br>O objetivo deste trabalho é o estudo das condições para a estabilidade de sistemas lineares discretos de dimensão infinita invariantes no tempo, evoluindo em um espaço de Hilbert. Apresentaremos uma vasta coleção de resultados sobre estabilidade assintótica uniforme, incluindo uma condição espectral equivalente. Em relação à estabilidade assintótica fraca, analisaremos tanto a dificuldade de se estabelecer uma condição necessária e suficiente sobre o espectro do operador, como também sua relação com similaridade a contra

APA, Harvard, Vancouver, ISO, and other styles

5

Curtis, Kedric W. "Size Scale Effects on Linear Weir Hydraulics." DigitalCommons@USU, 2016. https://digitalcommons.usu.edu/etd/5046.

Full text

Abstract:

Linear weirs are a common hydraulic structure that have been used for centuries with many different applications. One characteristic of weirs that is particularly useful is the head-discharge relationship where the discharge over the weir is directly related to the upstream water depth above the crest. In general, the head-discharge relationship for a weir is determined experimentally in laboratories using geometrically similar models. Due to space, time, money, and discharge capacity limitations at water laboratories, creating full scale models is not always a feasible option when determining

APA, Harvard, Vancouver, ISO, and other styles

6

Silva, Fernando Nunes da. "Desgaste corrosivo-cavitativo-erosivo de um a?o-carbono em meio aquoso com fra??es de sal (NaCl), CO2 e particulados s?lidos (SiO2)." Universidade Federal do Rio Grande do Norte, 2012. http://repositorio.ufrn.br:8080/jspui/handle/123456789/15699.

Full text

Abstract:

Made available in DSpace on 2014-12-17T14:58:19Z (GMT). No. of bitstreams: 1 FernandoNS_DISSERT.pdf: 5044327 bytes, checksum: 66e88407297dda873c6a6d882b6de312 (MD5) Previous issue date: 2012-08-27<br>Conselho Nacional de Desenvolvimento Cient?fico e Tecnol?gico<br>A batch of eighty-four coupons of low carbon steel were investigated at laboratory conditions under a corrosive, cavitative-corrosive (CO2) and corrosive-erosive (SiO2 + CO2) in an aqueous salt solution and two levels of temperature. The following measurements were made on Vickers (HV0,05, HV0,10, HV0,20) Microhardness tests at thr

APA, Harvard, Vancouver, ISO, and other styles

7

Moshgbar, Mojgan. "Prediction and real-time compensation of liner wear in cone crushers." Thesis, Loughborough University, 1996. https://dspace.lboro.ac.uk/2134/27362.

Full text

Abstract:

In the comminution industry, cone crushers are widely used for secondary and subsequent stages of size reduction. For a given crusher, the achieved size reduction is governed by the closed-side setting. Hadfield Steel is commonly used to line the crushing members to minimize wear. Yet, liner wear caused by some rock types can still be excessive. Enlargement of discharge opening induced by wear of liners produces a drift in product size which, if unchecked, can lead to high volumes of re-circulating load. Alteration of closed-side setting is now commonly achieved via hydraulic means. However, c

APA, Harvard, Vancouver, ISO, and other styles

8

Akroush, Muftah Emhemed. "Optimal Linear Filtering For Weak Target Detection in Radio Frequency Tomography." University of Dayton / OhioLINK, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=dayton158273299902246.

Full text

APA, Harvard, Vancouver, ISO, and other styles

9

Blecha, Martin. "Návrh testovacího zařízení pro test opotřebení axiálních kloubů řízení." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2018. http://www.nusl.cz/ntk/nusl-382264.

Full text

Abstract:

This diploma thesis deals with the design of several variants of test rig for tests of axial ball joints of passenger cars. The individual design variants are evaluated based on the evaluation matrix and then the best option is selected. Selected proposal includes a complete design including 3D models and strength analyses that focus on the most stressed construction nodes. These design nodes are solved using the finite element method. Hydraulics and hydraulic elements are equipped by the existing equipment from a test lab. At the end of this thesis is solved risk analysis of the new construct

APA, Harvard, Vancouver, ISO, and other styles

10

Armand, Marc Andre. "Contributions to the decoding of linear codes over a Galois ring." Thesis, University of Bristol, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.297851.

Full text

APA, Harvard, Vancouver, ISO, and other styles

11

Aengenheister, Stefan, Chao Liu, Christoph Broeckmann, and Katharina Schmitz. "Functional proof of a flat slide valve as a 4/3-way proportional valve." Technische Universität Dresden, 2020. https://tud.qucosa.de/id/qucosa%3A71085.

Full text

Abstract:

With a flat slide valve concept, when compared to conventional piston spool valves, reduced leakage and increased service life could be achieved. In order to achieve a reduction of leakage flows and guarantee the adjustability of the valves at the same time, a correct design of the pressure compensation is essential. The magnitude of force depends on both the operating point of the valve and the position of the slider. Due to the design of the flat slide valve, it is possible to use ceramic semi-finished products for the main stage, which consist of control plates and a slide plate. The geomet

APA, Harvard, Vancouver, ISO, and other styles

12

RITTO, THIAGO GAMBOA. "VIBRATION ANALYSIS OF LINEAR AND NON-LINEAR SYSTEMS IN THE CONTEXT OF WEAK-FORMULATION, MODAL ANALYSIS AND KARHUNEN-LOÈVEN BASIS." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2005. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=7650@1.

Full text

Abstract:

CONSELHO NACIONAL DE DESENVOLVIMENTO CIENTÍFICO E TECNOLÓGICO<br>Neste trabalho a Análise de Vibrações é tratada no contexto da formulação fraca. Um sistema contínuo é formulado abstratamente em um espaço de Hilbert e uma base de projeção é escolhida para a dinâmica. Um esquema de convergência para a aproximação é garantido à medida em que se aumenta o número de funções da base usada para representar a resposta do problema. Esta é a idéia por traz de métodos como o Método dos Elementos Finitos e o Método dos Modos Supostos, que derivam do Método de Galerkin. Esta estratégia é diferente

APA, Harvard, Vancouver, ISO, and other styles

13

Zhou, Qing. "Friction and wear of piston ring : cylinder liner contact in a large marine diesel engine." Thesis, Brunel University, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.393177.

Full text

APA, Harvard, Vancouver, ISO, and other styles

14

Botero, Alonso. "Sampling weak values : a non-linear Bayesian model for non-ideal quantum measurements /." Digital version accessible at:, 1999. http://wwwlib.umi.com/cr/utexas/main.

Full text

APA, Harvard, Vancouver, ISO, and other styles

15

Donovan, Alan. "On-line tool wear identification by tribo emf signal analysis." Thesis, Queensland University of Technology, 1993. https://eprints.qut.edu.au/107080/1/T%28BE%26E%29%20545%20On-line%20tool%20wear%20indentification%20by%20tribo%20emf%20signal%20analysis.pdf.

Full text

Abstract:

The acoustic air-borne signal, the cutting tool vibration, and the stochastic component of the tribo emf signal produced by single point continuous turning operations have been analysed using statistical techniques. The correlation between variation in their statistical function values and the degree of cutting tool flank wear has been considered to determine to what extent they may be applied to "in-process" tool wear identification. The test program used a range of cutting parameters typical for the cutting of mild steel and high tensile cast iron using high speed steel and carbide cutting

APA, Harvard, Vancouver, ISO, and other styles

16

Abbott, Catherine Ann. "Operators on Continuous Function Spaces and Weak Precompactness." Thesis, University of North Texas, 1988. https://digital.library.unt.edu/ark:/67531/metadc331171/.

Full text

Abstract:

If T:C(H,X)-->Y is a bounded linear operator then there exists a unique weakly regular finitely additive set function m:-->L(X,Y**) so that T(f) = ∫Hfdm. In this paper, bounded linear operators on C(H,X) are studied in terms the measure given by this representation theorem. The first chapter provides a brief history of representation theorems of these classes of operators. In the second chapter the represenation theorem used in the remainder of the paper is presented. If T is a weakly compact operator on C(H,X) with representing measure m, then m(A) is a weakly compact operator for every Borel

APA, Harvard, Vancouver, ISO, and other styles

17

Rudnytskyj, André. "Simulations of contact mechanics and wear of linearly reciprocating block-on-flat sliding test." Thesis, Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-68881.

Full text

Abstract:

The use of computational methods in tribology can be a valuable approach to deal with engineering problems, ultimately saving time and resources. In this work, amodel problem and methodology is developed to deal with a common situation found in experiments in tribology, namely a linearly reciprocating block-on-ﬂat drysliding contact. The modelling and simulation of such case would allow a better understanding of the contact pressure distribution, wear and geometry evolutionof the block as it wears out during a test. Initially, the introduction and motivation for this work is presented, followe

APA, Harvard, Vancouver, ISO, and other styles

18

Amaral, Jhony Sá do [UNESP]. "Semigrupos de operadores lineares limitados: soluções Mild e Weak." Universidade Estadual Paulista (UNESP), 2013. http://hdl.handle.net/11449/86518.

Full text

Abstract:

Made available in DSpace on 2014-06-11T19:22:18Z (GMT). No. of bitstreams: 0 Previous issue date: 2013-02-22Bitstream added on 2014-06-13T19:48:31Z : No. of bitstreams: 1 amaral_js_me_sjrp.pdf: 356567 bytes, checksum: 85048dd943d0aa273e0a6151db09d116 (MD5)<br>SejamAum operador fechado e densamente definido em um espa¸co de BanachX ef∈L 1 ([0,τ];X). O objetivo deste trabalho e apresentar uma condição necessária e suficiente para a existência de solução weak, dada por J. Ball, do problema { d dt u(t) = Au(t) +f(t), t > 0 u(0) = x. Neste caso, a solução weak coincide com a solução mild (dada pe

APA, Harvard, Vancouver, ISO, and other styles

19

Amaral, Jhony Sá do. "Semigrupos de operadores lineares limitados : soluções Mild e Weak /." São José do Rio Preto, 2013. http://hdl.handle.net/11449/86518.

Full text

Abstract:

Orientador: Juliana Conceição Precioso Pereira<br>Coorientador: Andrea Cristina Prokopczyk Arita<br>Banca: Michelle Fernanda Pierri Hernandez<br>Banca: Waldemar Donizete Bastos<br>Resumo: SejamAum operador fechado e densamente definido em um espa¸co de BanachX ef∈L 1 ([0,τ];X). O objetivo deste trabalho e apresentar uma condição necessária e suficiente para a existência de solução weak, dada por J. Ball, do problema { d dt u(t) = Au(t) +f(t), t > 0 u(0) = x. Neste caso, a solução weak coincide com a solução mild (dada pela Fórmula da Variação das Constantes). Como aplicação, estudaremos um pro

APA, Harvard, Vancouver, ISO, and other styles

20

Sanderson, Eleanor. "Testing for weak instruments in two-stage least squares estimation of linear instrumental variable models." Thesis, University of Bristol, 2014. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.690773.

Full text

Abstract:

Instrumental Variable (IV) methods are widely used in the analysis of economic data when the explanatory variable of interest is endogenous and so OLS estimation of the model is biased. However, if the instruments used do not strongly predict the endogenous variable being instrumented then the IV estimator will also give biased results. Weak Instrument Asymptotic theory can be used to model the strength of the instruments in Two-Stage Least Squares (2SLS) IV models and critical values have been developed to test for Weak Instruments in models with one time period. In the first part of this the

APA, Harvard, Vancouver, ISO, and other styles

21

Wassborg, Pär. "Tribological evaluation of the contact between upper compression ring and cylinder liner with different surface coatings." Thesis, Karlstads universitet, Institutionen för ingenjörsvetenskap och fysik, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:kau:diva-45454.

Full text

Abstract:

The constant pursuit in the automotive industry to increase the engines performance, new solutions are always developed and tested to reduce the friction and increase the efficiency in the engine. One component that contributes to friction losses is the piston ring pack where the top compression stands for up to 40 %. This master thesis collaborated with Scania’s material science department Basic engine and covers the friction and wear of four different materials on the cylinder liner surface against the top compression ring.The four tested materials were grey cast iron with different honing q

APA, Harvard, Vancouver, ISO, and other styles

22

Kim, Uijin. "Testing for weak instruments in a linear instrumental variables model under heteroskedasticity and in an exponential model." Thesis, University of Bristol, 2017. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.752745.

Full text

APA, Harvard, Vancouver, ISO, and other styles

23

Arekar, Chaitanya. "Real time analysis with development, simulation and validation of discrete element method models for tumbling mill charge motion and liner wear." Thesis, McGill University, 2004. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=81524.

Full text

Abstract:

Tumbling mills, which consume around 6% of world's electric power, though inefficient (use 1% of the supplied energy) have been used in mineral processing industry for over a century. Harsh internal mill environments have prevented the access to in-mill dynamics. This situation has led researchers to develop models based on the Discrete Element Method (DEM) to predict internal mill dynamics. But before DEM models can be used in the mineral processing industry, their rigorous validation is essential.<br>In this thesis, we have carried out real time analysis of the DEM model to enable onl

APA, Harvard, Vancouver, ISO, and other styles

24

Wibking, Benjamin Douglas. "Cosmic structure formation on small scales: From non-linear galaxy clustering to the interstellar medium." The Ohio State University, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=osu1561556033289855.

Full text

APA, Harvard, Vancouver, ISO, and other styles

25

Singh, Robert Artur [Verfasser], and Knud [Akademischer Betreuer] Jahnke. "The true nature of LINER galaxies, weak AGN or strong stars / Robert Artur Singh ; Betreuer: Knud Jahnke." Heidelberg : Universitätsbibliothek Heidelberg, 2015. http://d-nb.info/1180395158/34.

Full text

APA, Harvard, Vancouver, ISO, and other styles

26

Gu, Chongjie. "Modeling of two-body fatigue wear of cylinder liner in internal combustion engines during the break-in period and its impact on engine lubrication." Thesis, Massachusetts Institute of Technology, 2010. http://hdl.handle.net/1721.1/111760.

Full text

Abstract:

Thesis: S.M., Massachusetts Institute of Technology, Department of Mechanical Engineering, 2017.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references (pages 104-108).<br>Internal combustion engines are widely utilized in modem automobiles. Around 10% of the total fuel energy is dissipated to heat due to mechanical friction, among which 20% is caused by the contact between the cylinder liner and the piston rings. The wear of cylinder liner not only leads to surface damage, but also results in the change of liner lubrication conditions. Therefore, a large number of tes

APA, Harvard, Vancouver, ISO, and other styles

27

Gu, Chongjie. "Modeling of two-body fatigue wear of cylinder liner in internal combustion engines during the break-in period and its impact on engine lubrication." Thesis, Massachusetts Institute of Technology, 2017. http://hdl.handle.net/1721.1/111760.

Full text

Abstract:

Thesis: S.M., Massachusetts Institute of Technology, Department of Mechanical Engineering, 2017.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references (pages 104-108).<br>Internal combustion engines are widely utilized in modem automobiles. Around 10% of the total fuel energy is dissipated to heat due to mechanical friction, among which 20% is caused by the contact between the cylinder liner and the piston rings. The wear of cylinder liner not only leads to surface damage, but also results in the change of liner lubrication conditions. Therefore, a large number of tes

APA, Harvard, Vancouver, ISO, and other styles

28

Li, Siran. "Analysis of several non-linear PDEs in fluid mechanics and differential geometry." Thesis, University of Oxford, 2017. https://ora.ox.ac.uk/objects/uuid:20866cbb-e5ab-4a6b-b9dc-88a247d15572.

Full text

Abstract:

In the thesis we investigate two problems on Partial Differential Equations (PDEs) in differential geometry and fluid mechanics. First, we prove the weak L<sup> p</sup> continuity of the Gauss-Codazzi-Ricci (GCR) equations, which serve as a compatibility condition for the isometric immersions of Riemannian and semi-Riemannian manifolds. Our arguments, based on the generalised compensated compactness theorems established via functional and micro-local analytic methods, are intrinsic and global. Second, we prove the vanishing viscosity limit of an incompressible fluid in three-dimensional smooth

APA, Harvard, Vancouver, ISO, and other styles

29

Paulus, Andreas, and Georg Jacobs. "Tribolayer Formation on Bronze Cu Sn12Ni2 in the Tribological Contact between Cy linder and Cont rol Plate in an Axial Piston Pump with Swashplate Design." Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2016. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-200134.

Full text

Abstract:

The present study investigates the f ormation of tribolayers on bronze CuSn12Ni2. Two different test rigs are used, of which one is a sliding bearing test rig in order to perform lubricated thrust bearing tests. Bronze CuSn12Ni2 is used for the sliding elements and the counter body is made of C45 steel. In addition to that, an axial piston pump test rig was used to determine t he transfera bility of the results to th e axial pist on pump. The test conditions are set up in a way t hat the tribological load s in the contacts are similar to each other. Changes in the subsurfa ce morphology and th

APA, Harvard, Vancouver, ISO, and other styles

30

Siqueira, André Francisco Santos. "Soluções Fracas para um Sistema Não-Linear Envolvendo o Operador p-Laplaciano." Universidade Federal da Paraíba, 2010. http://tede.biblioteca.ufpb.br:8080/handle/tede/7457.

Full text

Abstract:

Made available in DSpace on 2015-05-15T11:46:24Z (GMT). No. of bitstreams: 1 arquivototal.pdf: 810707 bytes, checksum: 33aad19ba73032d41420617a7e402095 (MD5) Previous issue date: 2010-08-12<br>Coordenação de Aperfeiçoamento de Pessoal de Nível Superior<br>In this work we'll prove existence of weak solutions to a coupled mixed problem of nonlinear partial diferential equation in the class of systems of nonlinear Klein- Gordon equations involving pseudo-Laplacian operator. For proving existence of weak solutions we use Faedo-Galerkin's method with compacity and monotonicity properties.<br>Nest

APA, Harvard, Vancouver, ISO, and other styles

31

Johnsen, Pernilla. "Homogenization of Partial Differential Equations using Multiscale Convergence Methods." Licentiate thesis, Mittuniversitetet, Institutionen för matematik och ämnesdidaktik, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:miun:diva-42036.

Full text

Abstract:

The focus of this thesis is the theory of periodic homogenization of partial differential equations and some applicable concepts of convergence. More precisely, we study parabolic problems exhibiting both spatial and temporal microscopic oscillations and a vanishing volumetric heat capacity type of coefficient. We also consider a hyperbolic-parabolic problem with two spatial microscopic scales. The tools used are evolution settings of multiscale and very weak multiscale convergence, which are extensions of, or closely related to, the classical method of two-scale convergence. The novelty of th

APA, Harvard, Vancouver, ISO, and other styles

32

Howard, David M. "A study of discrepancy results in partially ordered sets." Diss., Georgia Institute of Technology, 2010. http://hdl.handle.net/1853/34794.

Full text

Abstract:

In 2001, Fishburn, Tanenbaum, and Trenk published a pair of papers that introduced the notions of linear and weak discrepancy of a partially ordered set or poset. Linear discrepancy for a poset is the least k such that for any ordering of the points in the poset there is a pair of incomparable points at least distance k away in the ordering. Weak discrepancy is similar to linear discrepancy except that the distance is observed over weak labelings (i.e. two points can have the same label if they are incomparable, but order is still preserved). My thesis gives a variety of results pertaining to

APA, Harvard, Vancouver, ISO, and other styles

33

Twining, Erika. "Voltage compensation in weak distribution networks using shunt connected voltage source converters." Monash University, Dept. of Electrical and Computer Systems Engineering, 2004. http://arrow.monash.edu.au/hdl/1959.1/9701.

Full text

APA, Harvard, Vancouver, ISO, and other styles

34

Куркчи, Євгеній Петрович, Евгений Петрович Куркчи та Yevhenii Petrovych Kurkchy. "Анализ методов поверхностного упрочнения, применяемых для увеличения износостойкости пар трения". Thesis, Сумский государственный университет, 2014. http://essuir.sumdu.edu.ua/handle/123456789/39651.

Full text

Abstract:

В большинстве газовых и воздушных компрессоров в цилиндро-поршневой группе используются материалы пар трения, позволяющие полностью исключить введение смазки в рабочую зону. Однако существует проблема недостаточной очистки перекачиваемого газа, из-за чего абразивосодержащие примеси шаржируют поверхность колец и в процессе трения такой конструкции происходит ускоренный износ поверхности втулки цилиндра.

APA, Harvard, Vancouver, ISO, and other styles

35

Barbosa, Brenno Gustavo. "Estabilidade de sistemas detetáveis com custo médio a longo prazo limitado." Universidade de São Paulo, 2012. http://www.teses.usp.br/teses/disponiveis/55/55134/tde-17042013-141818/.

Full text

Abstract:

Neste trabalho estudamos a estabilidade assintótica de Lagrange para duas classes de sistemas, sob as hipóteses de detetabilidade fraca e de limitação do custo medio a longo prazo. Para sistemas lineares com saltos markovianos com rudo aditivo, a equivalência entre estabilidade e as condições mencionadas sera provada. Para sistemas dinâmicos generalizados, provaremos a estabilidade sob uma condição adicional<br>In this work we study Lagrange asymptotic stability for two classes of systems, under conditions of weak detectability and boundedness of the long run average cost. For Markov jump line

APA, Harvard, Vancouver, ISO, and other styles

36

Rejowski, Edney Deschauer. "Caracterização e desempenho de um filme de carbono amorfo hidrogenado tipo diamante (a-C:H) dopado com silício, aplicado em camisa de cilindro de motor à combustão interna." Universidade de São Paulo, 2012. http://www.teses.usp.br/teses/disponiveis/85/85134/tde-10122012-125406/.

Full text

Abstract:

Nas últimas décadas, questões sobre o controle de emissões em motores à combustão interna e sobre a redução de consumo de combustível vêm sendo debatidas globalmente, com claros desdobramentos em especificações de controles mais restritos, a fim de permitir a comercialização de novos motores à combustão interna a consumidores mais exigentes, que presam pela qualidade de vida e meio ambiente. Mesmo com a introdução de novas tecnologias, os motores ainda apresentam uma grande perda da energia gerada por conta do atrito mecânico. Com base neste contexto, os projetos dos novos motores visam uma me

APA, Harvard, Vancouver, ISO, and other styles

37

Chen, Huyuan. "Fully linear elliptic equations and semilinear fractionnal elliptic equations." Thesis, Tours, 2014. http://www.theses.fr/2014TOUR4001/document.

Full text

Abstract:

Cette thèse est divisée en six parties. La première partie est consacrée à l'étude de propriétés de Hadamard et à l'obtention de théorèmes de Liouville pour des solutions de viscosité d'équations aux dérivées partielles elliptiques complètement non-linéaires avec des termes de gradient,<br>This thesis is divided into six parts. The first part is devoted to prove Hadamard properties and Liouville type theorems for viscosity solutions of fully nonlinear elliptic partial differential equations with gradient term

APA, Harvard, Vancouver, ISO, and other styles

38

Remund, Craig Timothy. "Design of CMOS Four-Quadrant Gilbert Cell Multiplier Circuits in Weak and Moderate Inversion." Diss., CLICK HERE for online access, 2004. http://contentdm.lib.byu.edu/ETD/image/etd611.pdf.

Full text

APA, Harvard, Vancouver, ISO, and other styles

39

Altafi, Nasrin. "Lefschetz Properties of Monomial Ideals." Licentiate thesis, KTH, Matematik (Inst.), 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-223373.

Full text

Abstract:

This thesis concerns the study of the Lefschetz properties of artinian monomial algebras. An artinian algebra is said to satisfy the strong Lefschetz property if multiplication by all powers of a general linear form has maximal rank in every degree. If it holds for the first power it is said to have the weak Lefschetz property (WLP). In the first paper, we study the Lefschetz properties of monomial algebras by studying their minimal free resolutions. In particular, we give an afirmative answer to an specific case of a conjecture by Eisenbud, Huneke and Ulrich for algebras having almost linear

APA, Harvard, Vancouver, ISO, and other styles

40

Passos, Lígia Maria Soares. "Uma metodologia baseada na lógica linear para análise de processos de workflow interorganizacionais." Universidade Federal de Uberlândia, 2016. https://repositorio.ufu.br/handle/123456789/12458.

Full text

Abstract:

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior<br>This work formalizes four methods based on Linear Logic for the verification of interorganizational workflow processes modelled by Interorganizational Workflow nets, which are Petri nets that model such processes. The first method is related to the verification of the Soundness criteria for interorganizational workflow processes. The method is based on the construction and analysis of Linear Logic proof trees, which represent the local processes as much as they do the global processes. The second and third methods are related, resp

APA, Harvard, Vancouver, ISO, and other styles

41

Persson, Jens. "Selected Topics in Homogenization." Doctoral thesis, Mittuniversitetet, Institutionen för teknik och hållbar utveckling, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:miun:diva-16230.

Full text

Abstract:

The main focus of the present thesis is on the homogenization of some selected elliptic and parabolic problems. More precisely, we homogenize: non-periodic linear elliptic problems in two dimensions exhibiting a homothetic scaling property; two types of evolution-multiscale linear parabolic problems, one having two spatial and two temporal microscopic scales where the latter ones are given in terms of a two-parameter family, and one having two spatial and three temporal microscopic scales that are fixed power functions; and, finally, evolution-multiscale monotone parabolic problems with one sp

APA, Harvard, Vancouver, ISO, and other styles

42

Del, Cet Riccardo. "Passaggio da più linee monoprodotto gestite con logica push ad una linea multiprodotto gestita con logica pull." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2020.

Find full text

Abstract:

Questa elaborato di tesi descrive i procedimenti (e successivamente i risultati) attuati dal reparto Lean & Strategic Operation della FAAC S.p.a. per la conversione di due linee monoprodotto gestite con logica push in un unica linea multiprodotto gestita con logica pull. Nel conseguimento di questo obbiettivo sono stati utilizzati utilizzati diversi strumenti visuali con diversi scopi: -Tecnica Yamazumi (per il bilanciamento delle diverse configurazioni della linea multiprodotto) -Work combination chart (tecnica che permette l'individuazione delle operazioni meno efficienti del processo pr

APA, Harvard, Vancouver, ISO, and other styles

43

Rehberger, Marcus. "Topographical micro-changes in corrugated board production : effects on flexographic post-print quality." Licentiate thesis, Stockholm : Department of Media Technology and Graphic Arts, School of Computer Science and Communication, Royal Institute of Technology, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-4583.

Full text

APA, Harvard, Vancouver, ISO, and other styles

44

Schattauer, Andreas. "Prozessentwicklung und Charakterisierung einer anodisch-keramisierten Al-Zylinderlaufbahn unter tribologischen Aspekten zur Reduzierung der CO2 - Emissionen." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2009. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-23651.

Full text

Abstract:

Die Anforderungen an die Verbrennungsmotoren im Hinblick auf Emissionen, Kraftstoffverbrauch und Leistungspotentiale sind in den letzten Jahren stark gestiegen. Die zunehmende Leistungsdichte, aufgrund eingesetzter Konzepte wie Downsizing und Aufladung, führt gerade an der Zylinderlaufbahn zu ansteigenden thermischen und mechanischen Belastungen. Aktuelle Konzepte, wie z.B. Aluminium-Silizium-Legierungen erreichen dabei ihre Belastungsgrenzen, so dass zur Absicherung der Funktion Grauguss - Legierungen in Buchsenform eingesetzt werden. Dies führt jedoch wiederum zu einem Motormehrgewicht mit

APA, Harvard, Vancouver, ISO, and other styles

45

DE, LEO ROBERTO. "On some geometrical and analytical problems arising from the theory of Isometric Immersion." Doctoral thesis, Università degli Studi di Cagliari, 2011. http://hdl.handle.net/11584/266285.

Full text

APA, Harvard, Vancouver, ISO, and other styles

46

Testov, Vladimir A. "On Evaluation Problem of the Quality of Educational Models." Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2012. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-81008.

Full text

Abstract:

The current approach to assessing the educational quality applicable to assessing objects and processes formed and realized in producing spheres is widely spread. However, as education is a much more complicated anthropological, social and cultural object in comparison to that of production, the above mentioned approach is least effective. In education both \"strong\" and \"weak\" models are used. There do not exist measurement instruments for accurate assessing mild results. Self control, expert assessing method and portfolio are being put forward.

APA, Harvard, Vancouver, ISO, and other styles

47

Rizzato, Matteo. "Non-Gaussian cosmology : theoretical and statistical challenges for modern galaxy surveys." Thesis, Sorbonne université, 2019. http://www.theses.fr/2019SORUS334.

Full text

Abstract:

Nous détaillons dans cette thèse les différentes étapes nécessaires l’implémentation numérique optimale du calcul de la vraisemblance des paramètres cosmologiques appliqué aux relevés modernes de lentillage gravitationnel faible des grandes structures. En particulier, nous nous concentrons sur la détection conjointe du spectre de puissance et du bispectre du lentillage gravitationnel faible. Pour ce faire, nous avons relevé les défis numériques requis par une analyse complète. Dans un premier temps, nous dressons l'état de l'art nécessaire à la compréhension du formalisme de la sonde cosmologi

APA, Harvard, Vancouver, ISO, and other styles

48

Redwane, Hicham. "Solutions normalisées de problèmes paraboliques et elliptiques non linéaires." Rouen, 1997. http://www.theses.fr/1997ROUES059.

Full text

Abstract:

Cette thèse est consacrée à l'étude de problèmes elliptiques ou paraboliques non linéaires qui sont, d'une façon générale, mal posés dans le cadre des solutions faibles (c'est-à-dire des solutions au sens des distributions). Pour surmonter cette difficulté, on va s'intéresser à une autre classe de solutions : les solutions renormalisées. Cette notion a été introduite par R. -J. Di Perna et P. -L. Lions pour l'étude des équations de Boltzmann, et les équations du premier ordre.

APA, Harvard, Vancouver, ISO, and other styles

49

Qureshi, Muhammad Shakeel. "Integrated front-end analog circuits for mems sensors in ultrasound imaging and optical grating based microphone." Diss., Atlanta, Ga. : Georgia Institute of Technology, 2009. http://hdl.handle.net/1853/29613.

Full text

Abstract:

Thesis (Ph.D)--Electrical and Computer Engineering, Georgia Institute of Technology, 2009.<br>Committee Chair: Hasler, Paul; Committee Co-Chair: Degertekin, Levent; Committee Member: Anderson, David; Committee Member: Ayazi, Farrokh; Committee Member: Brand, Oliver; Committee Member: Hesketh, Peter. Part of the SMARTech Electronic Thesis and Dissertation Collection.

APA, Harvard, Vancouver, ISO, and other styles

50

Bencheikh, Oumaima. "Analyse de l'erreur faible de discrétisation en temps et en particules d'équations différentielles stochastiques non linéaires au sens de McKean." Thesis, Paris Est, 2020. http://www.theses.fr/2020PESC1030.

Full text

Abstract:

Cette thèse est consacrée à l'étude théorique et numérique de l'erreur faible de discrétisation en temps et en particules d'Équations Différentielles Stochastiques non linéaires au sens de McKean. Nous abordons dans la première partie l'analyse de la vitesse faible de convergence de la discrétisation temporelle d'EDS standards. Plus spécifiquement, nous étudions la convergence en variation totale du schéma d'Euler-Maruyama appliqué à des ED d-dimensionnelles avec un coefficient de dérive mesurable et un bruit additif. Nous obtenons, en supposant que le coefficient de dérive est borné, un ordre

APA, Harvard, Vancouver, ISO, and other styles

We offer discounts on all premium plans for authors whose works are included in thematic literature selections. Contact us to get a unique promo code!