Dissertations / Theses on the topic 'C/PPS'
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Lacoma, Vincent. "Évaluation environnementale des procédés composites pour l'analyse multicritère des systèmes de production : méthodologies, outils et applications." Electronic Thesis or Diss., Ecole centrale de Nantes, 2023. http://www.theses.fr/2023ECDN0020.
Full textIn the current context of environmental transition, this thesis aims to participate in the reduction of environmental impacts related manufacturing of composite parts, which has been a growing sector for several years. To this purpose,an environmental assessment methodology dedicated to composite manufacturing processes is fundamental to develop and evaluate strategies forreducing environmental impacts. To be applicable in the industry, these strategies must respect the technical and economic imperatives of companies.To carry out environmental assessments, the standardized Life Cycle Assessment (LCA) method can be used. However, the general nature of this approach leaves latitudes on its application which have not been yet the subject of a scientific consensus in the case of composite manufacturing.Thus, our work proposes details for each step of the LCA method to build a model of the environmental impacts of the manufacturing process which depend on its parameters, such as the forming temperatures and the consolidation efforts. A similar approach is also developed for the evaluation of economic indicators based on the same parameters. Finally, multi-criteria decision-making tools are offered to find solutions to the objective of reducing environmental impacts and manufacturing costs while ensuringc ompliance with the technical specifications of the parts produced. In this thesis, the case of thermostamping of polyphenylene sulfide reinforced with carbon fibres (C/PPS) parts is studied to support the construction and presentation of the proposed methodologies
Bouscarrat, David. "Time-dependent damage in woven-ply thermoplastic composites above glass transition temperature Influence of time-dependent phenomena on translaminar fracture of woven-ply C/PPS laminates above the glass transition temperature." Thesis, Normandie, 2019. http://www.theses.fr/2019NORMIR29.
Full textIn fiber-reinforced polymer matrix composite materials, the coupling between viscous behaviour (viscoelasticity, viscoplasticity) and damage mechanisms is very little studied at the mesoscopic scale and is mainly limited to port-mortem analyses. For high-temperature aeronautical applications (e.g., aircraft engine nacelle), the problem is even more complex within high performance thermoplastic matrix laminates PPS (Polyphenylene Sulfide) reinforced with carbon fiber fabrics. Indeed, these materials are characterized by matrix-rich zones whose viscous behaviors are exacerbated for service temperatures (i.e., 120°C) higher than the matrix glass transition temperature (about 95°C). It is therfore necessary to develop specific experimental procedures to highlight and quantify the viscous damage when the behaviour of C/PPS laminates is driven by the mechanical response of the matrix. In order to provide answers to this problem, one can evaluate : (1) the influence of the matrix viscosity on the translaminar fracture behaviour - (2) the time-dependent damage during creep-type loading. These two lines of study are based on the development of experimental protocols adapted to high temperature mechanical testing. Thus, the originality of this work is to combine different complementary techniques (acoustic emission, edge replication, fractographic analysis, tomography) which allow in-situ and in real time analyses of the damage mechanisms that coexist and interact during the different loading phases. Using the protocol developed under conditions of temperature higher than the Tg of the material, these techniques provide information to quantify and dissociate the different material behaviours (viscoelasticity, viscoplasticity, damage) as well as structural effects (fibre rotation). Image analyses based on dilatation/erosion algorithms implemented in Matlab allow the evaluation of the surface cracking density (intra- and inter-strand) from edge replicas. On a macroscopic scale, the thermomechanical response of C/PPS is little influenced by the viscous behaviour of C/PSS, whether for quasi-isotropic laminates (behaviour mainly driven by 0°fibres) or with oriented plies (behaviour mainly driven by the PPS matrix). Finally, the ductile translaminar fracture is characterized by the evolution of the cumulative acoustic energy as a function of the energy restitution rate. The instability of the translaminar fracture does not allow the quantification of the influence of viscous effects on the mode I toughness of the material at initiation. At micro and mesoscopic scales, the results obtained clearly show time-dependent damage within oriented plies C/PPS laminates subjected to creep loadings at T > Tg. By implementing this protocol, the demonstrated relevance/complementarity of the acoustic emission associated with the quantification of the cracking density allows the study of the coupling between viscous effects and damage within C/PPS laminates subjected to high temperature loading. This problem is essential from the point of view of the durability of composite structures in an engine environment
Muñoz, Trinidad. "Synthesis, structure and redox reactivity of Co₃(CO)₆(μ₂-η²,η¹-C(Ph)C=C(PPH₂)C(O)SC(O)) (μ₂-PPh₂)." Thesis, University of North Texas, 1994. https://digital.library.unt.edu/ark:/67531/metadc279408/.
Full textSun, G. A. "A study of catalysis by [RuCl(H)(PPh₃)₃] and [η⁵-C₇H₉)RuCl(PPh₃)₂]." Thesis, University of Sheffield, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.242370.
Full textHjelm-Andersson, Alexander. "En kombination av Bluetooth och LabVIEW för ett universellt mätdatorsystem inom medicinsk teknik." Thesis, Linköping University, Department of Biomedical Engineering, 2004. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-2816.
Full textExamensarbetet är utfört på Linköpings Universitet, Institutionen för Medicinsk Teknik och bygger på att undersöka möjligheterna för trådlös överföring av mätvärden via Bluetooth. Mätningarna gäller två olika hårdvaror som med metoden PPG mäter blodflöde, en ny förenklad hårdvara och en mer avancerad och tidigare utvecklad hårdvara. Arbetet är tvådelat, under första delen upprättades en kommunikation med Bluetooth och två metoder för överföring av data undersöktes. Under andra delen togs ett gränssnitt fram i utvecklingsmiljön LabVIEW för styrning av hårdvarorna samt för åskådliggörandet av mätdata. Metoderna som undersöktes för dataöverföring är att antingen kontinuerligt skicka samplat data direkt från en AD-omvandlare eller att fylla bluetoothmodulens minne för att därefter skicka samtliga värden samtidigt. För utvärdering av vilken metod som passar bäst för ändamålet diskuteras för- och nackdelar, samplingshastigheter undersöks och redovisas med hjälp av tabeller och grafer. Examensarbetet har resulterat i en grund för fortsatt utveckling av trådlös anpassning av mättekniska ändamålinom medicinsk teknik.
Persson, Herman, and Alexandru Zamfir. "Uttorkning av betong i nyproduktion." Thesis, Linnéuniversitetet, Institutionen för byggteknik (BY), 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-97204.
Full textIn the recent years, the manufacturing of concrete has undergone a change to make theprocesses and the material more environmentally friendly. This is accompanied by thefact that concrete is one of the most important building materials in the world. This islargely because concrete as a material is moisture resistant, does not mold and is highlyformable.The United Nations mentions 17 global goals whose mission is to promote sustainabilityin the future whereas the ninth one states that “Build resilient infrastructure, promoteinclusive and sustainable industrialization and foster innovation”. This leads to the factthat it needs to take in consideration the manufacturing of concrete and its components.The purpose of this research is to show strengths and weaknesses in prediction tools forconcretes drying time by comparison with data from many measuring points. Besidesthat, the aim is to compare statistics of practical measurements, which were issued byConservator AB, with each other and with other three most commonly used programs inforecasting the drying time for concrete, i.e. TorkaS, BI-Dry and PPB.From the building sections that were researched, TorkaS gave the highest accuracy inforecasting the drying time and then followed very closely by PPB. In addition, BI-Drydid not meet the expected requirements on some of the building sections. Besides that, thestudy has shown that the drying time of concrete in new production is most influenced bythe drying climate and the thickness of the compound.
Wenning, Christian [Verfasser], Annette M. [Gutachter] Schmidt, and Marc C. [Gutachter] Leimenstoll. "Reaction-Induced Phase Separation of PPG/PEO/HDI based bi-Soft Segment Polyurethanes / Christian Wenning ; Gutachter: Annette M. Schmidt, Marc C. Leimenstoll." Köln : Universitäts- und Stadtbibliothek Köln, 2017. http://d-nb.info/1151638307/34.
Full textWilms, Andrea. "Messung der Analysierstärke der Reaktion ->pp->ppg [pp pp gamma] mit dem COSY-TOF-Spektrometer bei einem Strahlimpuls von 798 MeV/c." [S.l. : s.n.], 2002. http://deposit.ddb.de/cgi-bin/dokserv?idn=965035328.
Full textBuchmann, Silke. "Elektrochemische Untersuchungen an Ir-Tripod-Komplexen (Tripod = cis,cis-1,3,5-(PPh 2 ) 3- 1,3,5-X 3 C 6 H 6:X = CN, COOMe, CH 2 OMe)ronische Ressource /." [S.l. : s.n.], 2002. http://www.bsz-bw.de/cgi-bin/xvms.cgi?SWB10236370.
Full textPouillon, Valérie. "Etude des effets de l'inactivation des isoformes B et C de l'enzyme INS(1,4,5)Pp3s 3-kinase chez la souris ;Rôle de l'INS(1,4,5)Pp3s3-kinase B dans le développement des lymphocytes T." Doctoral thesis, Universite Libre de Bruxelles, 2004. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/211197.
Full textL’Ins(1,3,4,5)P4 est aussi le point de départ de toute une série d’inositol hautement phosphorylés, dont les rôles ne sont pas clairs. Trois isoformes de l’Ins(1,4,5)P3 3-kinase existent (A, B et C). Ces isoformes possèdent un domaine catalytique carboxy-terminal bien conservé. Par contre, les domaines amino-terminaux sont spécifiques et leur permettraient d’établir des interactions ou de subir des régulations propres. Pour tenter d’élucider le rôle fonctionnel de l’Ins(1,3,4,5)P4, nous avons généré et analysé des souris déficientes pour les isoformes B et C de cette enzyme.
Les souris déficientes pour l’Ins(1,4,5)P3 3-kinase C ne présentent pas de phénotype évident, ce qui suggère que son rôle n’est pas crucial ou que son absence peut être compensée par une autre enzyme.
Les souris déficientes pour l’Ins(1,4,5)P3 3-kinase B, par contre, présentent une immunodéficience caractérisée par une absence spécifique des lymphocytes T αβ périphériques. Cette absence fait suite à un blocage dans la différenciation du précurseur du lymphocyte, le thymocyte. Les caractéristiques de la signalisation induite par le récepteur de surface (TCR) permettent la sélection des thymocytes, de manière à constituer un pool de lymphocytes T restreints pour le MHC et tolérants pour le soi. Nous avons montré que ces phénomènes de sélection étaient défectueux dans les thymocytes mutants, du fait de leur hyporéactivité à la stimulation par le TCR. Le mécanisme responsable de cette hyporéactivité n’est pas encore élucidé. A première vue, la mobilisation de Ca 2+ ne semble pas altérée dans ces thymocytes mutants en réponse à des stimulations classiques. Cependant, d’autres types de stimulation, se rapprochant plus de celles réellement rencontrées par le thymocyte in vivo, doivent encore être investigués. L’intégrité d’autres voies de signalisation cruciales du lymphocyte T doit aussi être vérifiée.
En conclusion, l’isoforme B de l’Ins(1,4,5)P3 3-kinase et l’Ins(1,3,4,5)P4 qu’il produit jouent un rôle crucial dans la différenciation du thymocyte, par un mécanisme qui reste encore à déterminer.
Doctorat en sciences biomédicales
info:eu-repo/semantics/nonPublished
Brichese, Laetitia. "Phosphorylation de BCL-2 en réponse au traitement par le paclitaxel : mécanismes moléculaires impliqués et conséquences sur sa fonction anti-apoptotique." Toulouse 3, 2002. http://www.theses.fr/2002TOU30083.
Full textChristofi, Maria. "Preuves de sécurité outillées d’implémentations cryptographiques." Versailles-St Quentin en Yvelines, 2013. http://www.theses.fr/2013VERS0029.
Full textIn this thesis, we are interested on the formal verification of cryptographic implementations. In the first part, we study the verification of the protocol mERA using the tool ProVerif. We prove that this protocol verifies some security properties, like the authentication, the secrecy and the unlinkability, but also properties like its vivacity. In the second part of this thesis, we study the formal verification of cryptographic implementations against an attack family: attacks with fault injection modifying data. We identify and present the different models of these attacks considering different parameters. We then model the cryptographic implementation (with its countermeasures), we inject all possible fault scenarios and finally we verify the corresponding code using the Frama-C tool, based on static analysis techniques. We present a use case of our method: the verification of an CRT-RSA implementation with Vigilant’s countermeasure. After expressing the necessary properties for the verification, we inject all fault scenarios (regarding the chosen fault model). This verification reveals two fault scenarios susceptible to flow secret information. In order to mechanize the verification, we insert fault scenarios automatically according to both single and multi fault attacks). This creates a new Frama-C plug-in: TL-FACE
Vodák, René. "Techniky paralelního zpracování výpočtů." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2014. http://www.nusl.cz/ntk/nusl-220667.
Full textRashid, S. M. Shahriar. "Design and Heterogeneous Integration of Single and Dual Band Pulse Modulated Class E RF Power Amplifiers." The Ohio State University, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=osu1543505207173487.
Full textWickman, Axel. "Exploring feasibility of reinforcement learning flight route planning." Thesis, Linköpings universitet, Institutionen för datavetenskap, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-178314.
Full textWu, Zheng-Wei, and 吳政衛. "A Low-Voltage Low-Power 17 ppm/c Voltage Reference Using Simple Peaking Current Mirror Circuit." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/2my943.
Full text國立交通大學
電機與控制工程系所
92
This thesis presents a new and extremely simple low-voltage low-power voltage reference circuit. The voltage reference circuit uses the peaking current mirror circuit to extract the current with PTAT (proportional to absolute temperature), and then the current, through a resistor, is used to compensate for the gate-source voltage with the negative temperature coefficient. Since the transistors in the peaking current mirror circuit are operated in weak inversion (subthreshold region), both the power consumption and the required working supply voltage of the reference circuit are all low. The circuit only requires six elements, four transistors and two resistors. The proposed circuit is implemented using the TSMC 0.35um 3P3M SiGe BiCMOS technology. The design IC, after post simulation, attains the minimum supply voltage 1.4 V, output reference voltage 710 mv, temperature coefficient of 17 ppmC,$ power consumption 6.68 uW and power supply noise rejection ratio -84 dB at 1MHz.
Stanitzek, Susanne [Verfasser]. "Strukturelle Charakterisierung der PPC-Synthetase aus der Biosynthese von Coenzym A : Röntgenstrukturanalyse des Co-Chaperons Cns1-218-C und des Fc-Fragments des Antikörpers MAK33 aus Maus / Susanne Stanitzek." 2005. http://d-nb.info/977596508/34.
Full textStrotman, Neil Adham. "I. Stereochemistry of cyclopropane formation involving group (IV) organometallic complexes : II. Slower stoichiometric and faster catalytic reduction of aldehydes by the PPh₃ substituted hydroxycyclopentadienyl ruthenium hydride [2,5-Ph₂-3,4-Tol₂([eta]⁵-C₄COH)]Ru(CO)(PPh₃)H: a highly complex chemoselective catalyst for hydrogenation of aldehydes over ketones /." 2005. http://catalog.hathitrust.org/api/volumes/oclc/70792586.html.
Full textPark, Alex. "Characterization of a novel class of anti-HCV agents targeting protein-protein interactions." Thèse, 2016. http://hdl.handle.net/1866/18893.
Full textHepatitis C virus (HCV) is an important causative agent for liver diseases and is responsible for a worldwide pandemic affecting roughly 180 million individuals worldwide. Late diagnosis following the progression to fibrosis and to cirrhosis, in nearly 16% of chronic infections, is attributed to the absence of symptoms in the first years of infection. By exploiting membrane protein-protein interactions (PPI), live cell assays using bioluminescence resonance energy transfer (BRET) technology have previously been optimized to complete a comprehensive hepatitis C virus (HCV) protein interaction network. Using the groundwork laid by this network study, a high-throughput assay (HTS) cell-based assay was implemented to identify novel inhibitory compounds targeting an unreported NS3/4A-NS3/4A interaction. Approximately 110,000 compounds from a small-molecule collection were screened to monitor modulation of NS3/4A homodimerization and were discriminated based on specificity and potency. UM42811 was identified as a potential NS3/4A-NS3/4A interaction activator and found to have a promising antiviral activity boasting an excellent therapeutic window. Combined deep sequencing and mutation mapping have yielded a resistance profile based on statistical and functional probability pointing towards a novel inhibitory mechanism targeting the HCV NS3/4A independent from protease activity inhibition. Data from an HCV to host protein interaction network generated by our group was used to analyze alternative effects of UM42811 on interactions which potentially benefit viral persistence. NS3/4A-specific host interactors were heavily associated with nuclear and mitochondrial transport based on Gene Ontology (GO). Among these specific interactors, karyopherin subunit beta 1 (KPNB1) and heat shock protein 60 (HSP60) were selected for further study. Interestingly, co-immunoprecipitation experiments revealed that UM42811 was able to prevent both KPNB1-NS3/4A and HSP60-NS3/4A interactions. Moreover, functional and western analysis revealed the KPNB1-NS3/4A interaction to have deleterious effects on iv interferon stimulated gene (ISG) induction. Unexpectedly, analysis revealed a putative NS3/4A mediated cleavage of KPNB1. Overall, this study demonstrates the strength of cell-based PPI strategies in the identification of novel HCV antiviral compounds, characterizes a novel inhibitory mechanism for HCV and reveals a potentially novel viral immune evasion mechanism.