Relevant bibliographies by topics / MRV

Contents

  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers
  6. Reports

Academic literature on the topic 'MRV'

Author: Grafiati
Published: 4 June 2021
Last updated: 4 February 2022

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

Select a source type:

Consult the lists of relevant articles, books, theses, conference reports, and other scholarly sources on the topic 'MRV.'

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.

Journal articles on the topic "MRV"

1

Gilfeather, Maryellyn, and E. Roberts. "Pulmonary MRA and Venous MRV." Seminars in Interventional Radiology 15, no. 02 (June 1998): 205–14. http://dx.doi.org/10.1055/s-2008-1057047.

Full text
APA, Harvard, Vancouver, ISO, and other styles
2

Roner, Michael R., and Bradley G. Steele. "Features of the mammalian orthoreovirus 3 Dearing l1 single-stranded RNA that direct packaging and serotype restriction." Journal of General Virology 88, no. 12 (December 1, 2007): 3401–12. http://dx.doi.org/10.1099/vir.0.83209-0.

Full text
Abstract:
A series of recombinant mammalian orthoreoviruses (mammalian orthoreovirus 3 Dearing, MRV-3De) were generated that express an MRV-3De λ3–CAT fusion protein. Individual viruses contain L1CAT double-stranded (ds) RNAs that range in length from a minimum of 1020 bp to 4616 bp. The engineered dsRNAs were generated from in vitro-transcribed single-stranded (ss) RNAs and incorporated into infectious virus particles by using reverse genetics. In addition to defining the sequences required for these ssRNAs to be ‘identified’ as l1 ssRNAs, the individual nucleotides in these regions that ‘mark’ each ssRNA as originating from mammalian orthoreovirus 1 Lang (MRV-1La), mammalian orthoreovirus 2 D5/Jones (MRV-2Jo) or MRV-3De have been identified. A C at position 81 in the MRV-1La 5′ 129 nt sequence was able to be replaced with a U, as normally present in MRV-3De; this toggled the activity of the MRV-1La ssRNA to that of an MRV-3De 5′ l1. RNA secondary-structure predictions for the 5′ 129 nt of both the biologically active MRV-3De l1 ssRNA and the U81-MRV-3De-restored MRV-1La 5′ ssRNA predicted a common structure.
APA, Harvard, Vancouver, ISO, and other styles
3

Harima, Hayato, Michihito Sasaki, Masahiro Kajihara, Gabriel Gonzalez, Edgar Simulundu, Eugene C. Bwalya, Yongjin Qiu, et al. "Characterization of mammalian orthoreoviruses isolated from faeces of pigs in Zambia." Journal of General Virology 101, no. 10 (October 1, 2020): 1027–36. http://dx.doi.org/10.1099/jgv.0.001476.

Full text
Abstract:
Mammalian orthoreovirus (MRV) has been identified in humans, livestock and wild animals; this wide host range allows individual MRV to transmit into multiple species. Although several interspecies transmission and genetic reassortment events of MRVs among humans, livestock and wildlife have been reported, the genetic diversity and geographic distribution of MRVs in Africa are poorly understood. In this study, we report the first isolation and characterization of MRVs circulating in a pig population in Zambia. In our screening, MRV genomes were detected in 19.7 % (29/147) of faecal samples collected from pigs by reverse transcription PCR. Three infectious MRV strains (MRV-85, MRV-96 and MRV-117) were successfully isolated, and their complete genomes were sequenced. Recombination analyses based on the complete genome sequences of the isolated MRVs demonstrated that MRV-96 shared the S3 segment with a different MRV isolated from bats, and that the L1 and M3 segments of MRV-117 originated from bat and human MRVs, respectively. Our results suggest that the isolated MRVs emerged through genetic reassortment events with interspecies transmission. Given the lack of information regarding MRVs in Africa, further surveillance of MRVs circulating among humans, domestic animals and wildlife is required to assess potential risk for humans and animals.
APA, Harvard, Vancouver, ISO, and other styles
4

Shajdakov, E. V., A. B. Sannikov, V. M. Emelyanenko, L. N. Kryukova, A. E. Baranova, and M. A. Rachkov. "MRI- and CT-venography in the diagnosis of hemodynamic disorders in patients suffering from lower extremities chronic venous disorders. Part II. Possibilities of MRI in diagnostics of the deep vein thrombosis." Medical Visualization 25, no. 1 (March 24, 2021): 117–39. http://dx.doi.org/10.24835/1607-0763-901.

Full text
Abstract:
In this literature review, the analysis of the studies of venous blood flow pathology in the inferior Vena cava system using magnetic resonance imaging (MRI) is carried out. Special attention is paid to the attempts made to use this method in the diagnosis of chronic lower limb vein disorders (CVD) through magnetic resonance venography (MRV). Historically and methodically, the gradual introduction of MRV methods in the diagnosis of lower limb vein thrombosis (LEDVT) and venous thromboembolism (VTE) has been shown.Methods of non-contrast MRV based on the effect of blood flow, as in the case of MR-Angiography, are divided into two principal groups: methods based on the amplitude effects of Time-of-Flight (TOF) and methods based on Phase Contrast effects (PC). Techniques for conducting contrast-free MRV are described in detail. Attention is paid to pulse sequences used in the world for visualization of veins in contrast-free MRV in TOF and PC mode (FR-FBI, SPADE, SSFP) and post-processing methods: 2D-TOF MRV FLASH, 2D-TOF MRV CRASS, FIPS, VED, VENS.Contrast-enhanced MRV (CE MRV) is based on the use of “blood pool” contrast agents, which feature the ability to form stable compounds with blood plasma proteins. Worldwidesubstances with magnetic and supermagnetic properties based on gadolinium or iron oxide are used as contrast agents for CE MRV. The result of using these contrast agents is an increase in the quality of visualization due to a better signal to noise ratio (SNR) using 3D image processing (3D CE MRV) using fast sequences: GRE, TFLAS, VESPA, CAT, in conditions of direct and indirect CE MRV.It is noted that in recent years, certain restrictions have been imposed on certain linear contrast agents containing gadolinium in their further use. Therefore, for the purpose of CE MRV, it is efficientl to use only cyclic contrast agents to avoid unnecessary risks.Contrast-free MRV has again received intensive development in recent years, due to the restrictions imposed, one of these methods is direct thrombus imaging (Direct Thrombus Imaging – DTI or Magnetic Resonance Direct Thrombus Imaging - MRDTI) using fast pulse sequences: bSSFP, BBTI, DANTE. The latest research on this LEDVT diagnostic method was published in 2019 and has shown high diagnostic value.For all the most commonly used methods of MRV, specificity and sensitivity are shown.Further MRV in patients with CVD and DVT is a promising diagnostic task in modern phlebology. MRV should be introduced into clinical practice more actively than it is today.
APA, Harvard, Vancouver, ISO, and other styles
5

Qin, Qingsong, Craig Hastings, and Cathy L. Miller. "Mammalian Orthoreovirus Particles Induce and Are Recruited into Stress Granules at Early Times Postinfection." Journal of Virology 83, no. 21 (August 26, 2009): 11090–101. http://dx.doi.org/10.1128/jvi.01239-09.

Full text
Abstract:
ABSTRACT Infection with many mammalian orthoreovirus (MRV) strains results in shutoff of host, but not viral, protein synthesis via protein kinase R (PKR) activation and phosphorylation of translation initiation factor eIF2α. Following inhibition of protein synthesis, cellular mRNAs localize to discrete structures in the cytoplasm called stress granules (SGs), where they are held in a translationally inactive state. We examined MRV-infected cells to characterize SG formation in response to MRV infection. We found that SGs formed at early times following infection (2 to 6 h postinfection) in a manner dependent on phosphorylation of eIF2α. MRV induced SG formation in all four eIF2α kinase knockout cell lines, suggesting that at least two kinases are involved in induction of SGs. Inhibitors of MRV disassembly prevented MRV-induced SG formation, indicating that viral uncoating is a required step for SG formation. Neither inactivation of MRV virions by UV light nor treatment of MRV-infected cells with the translational inhibitor puromycin prevented SG formation, suggesting that viral transcription and translation are not required for SG formation. Viral cores were found to colocalize with SGs; however, cores from UV-inactivated virions did not associate with SGs, suggesting that viral core particles are recruited into SGs in a process that requires the synthesis of viral mRNA. These results demonstrate that MRV particles induce SGs in a step following viral disassembly but preceding viral mRNA transcription and that core particles are themselves recruited to SGs, suggesting that the cellular stress response may play a role in the MRV replication cycle.
APA, Harvard, Vancouver, ISO, and other styles
6

Liu, Chun Mei, Xiao Hua Wang, and Mao Sheng Duan. "Research on MRV Establishing in Future Emissions Trading Scheme in China - Based on Analysis on MRV of Overseas Representative Ets." Advanced Materials Research 524-527 (May 2012): 2641–45. http://dx.doi.org/10.4028/www.scientific.net/amr.524-527.2641.

Full text
Abstract:
This paper focused on the monitoring, reporting and verification (MRV) establish in China’s future emissions trading scheme (ETs) through the experience from overseas MRV of emissions trading scheme. First, introduced what is ETs and theory of emissions trading scheme. Then, analyzed the key elements in ETs and the effect of MRV in establishing ETs. Third, using comparison analysis summarized the general requirements from MRV of EU ETS, JVETS and RGGI. Finally, summarized the experiences in the aspects: identification of boundary, emission resource, monitoring methodologies, reporting and verification. And proposed some suggestions for MRV establishing in China’s future ETs.
APA, Harvard, Vancouver, ISO, and other styles
7

Rathnayake, Udara, Matt Folley, S. D. G. S. P. Gunawardane, and Carwyn Frost. "Investigation of the Error of Mean Representative Current Velocity Based on the Method of Bins for Tidal Turbines Using ADP Data." Journal of Marine Science and Engineering 8, no. 6 (May 29, 2020): 390. http://dx.doi.org/10.3390/jmse8060390.

Full text
Abstract:
Representing the velocity at a tidal energy extraction site in a standardized manner is essential for the development of the tidal energy sector. The International Electrotechnical Commission (IEC) have issued a technical specification to determine the mean representative current velocity (MRV) relative to a tidal energy converter (TEC). This method determines the MRV using an acoustic Doppler profiler (ADP). This is used to evaluate the power performance of a TEC and so can have a significant influence on the power performance uncertainties, due to the cubed relationship of the MRV and power. This paper investigates these uncertainties in the MRV by considering four sources of uncertainty in the ADP. These are turbulence intensity, tilt, Doppler noise and beam misalignment of an ADP. A synthetically generated dataset is used to define current velocity and profile using the characteristics of currents and ADP. The generated synthetic dataset is processed to calculate the MRV based on the standard IEC method. An alternative method to calculate the MRV, called the temporal-spatial method (TSM), is proposed and the two methodologies are used to assess the error of the MRV. A sensitivity analysis shows that the errors of the MRV based on the standard IEC method are always higher than the TSM. The biases in the MRV based on the different combinations of the uncertainty are investigated and it is found that the bias for the MRVs based on the TSM method is generally less than that of the IEC method.
APA, Harvard, Vancouver, ISO, and other styles
8

Murray, Kenneth E., and Max L. Nibert. "Guanidine Hydrochloride Inhibits Mammalian Orthoreovirus Growth by Reversibly Blocking the Synthesis of Double-Stranded RNA." Journal of Virology 81, no. 9 (February 14, 2007): 4572–84. http://dx.doi.org/10.1128/jvi.02106-06.

Full text
Abstract:
ABSTRACT Millimolar concentrations of guanidine hydrochloride (GuHCl) are known to inhibit the replication of many plant and animal viruses having positive-sense RNA genomes. For example, GuHCl reversibly interacts with the nucleotide-binding region of poliovirus protein 2CATPase, resulting in a specific inhibition of viral negative-sense RNA synthesis. The use of GuHCl thereby allows for the spatiotemporal separation of poliovirus gene expression and RNA replication and provides a powerful tool to synchronize the initiation of negative-sense RNA synthesis during in vitro replication reactions. In the present study, we examined the effect of GuHCl on mammalian orthoreovirus (MRV), a double-stranded RNA (dsRNA) virus from the family Reoviridae. MRV growth in murine L929 cells was reversibly inhibited by 15 mM GuHCl. Furthermore, 15 mM GuHCl provided specific inhibition of viral dsRNA synthesis while sparing both positive-sense RNA synthesis and viral mRNA translation. By using GuHCl to provide temporal separation of MRV gene expression and genome replication, we obtained evidence that MRV primary transcripts support sufficient protein synthesis to assemble morphologically normal viral factories containing functional replicase complexes. In addition, the coordinated use of GuHCl and cycloheximide allowed us to demonstrate that MRV dsRNA synthesis can occur in the absence of ongoing protein synthesis, although to only a limited extent. Future studies utilizing the reversible inhibition of MRV dsRNA synthesis will focus on elucidating the target of GuHCl, as well as the components of the MRV replicase complexes.
APA, Harvard, Vancouver, ISO, and other styles
9

Pratami, Zita Hadiah, Sudiyono Sudiyono, and Yeti Kartikasari. "Analisis Nilai Velocity Encoding terhadap Informasi Citra Magnetic Resonance Venography pada Penderita Tumor Kepala." Jurnal Imejing Diagnostik (JImeD) 2, no. 2 (July 11, 2016): 154–59. http://dx.doi.org/10.31983/jimed.v2i2.3175.

Full text
Abstract:
Background: Brain Magnetic Resonance Venography (MRV) is a MRI examination of veins without contrast media. Phase Contrast (PC) MRV sequences uses phase shift protons that flow along the magnetic gradient into needed area (Field Of View). PC MRV sequences use bipolar gradient to compensate the proton spin speed by adjusting the amplitude. The study aims to determine the Velocity encoding Value (VENC) to MRV image information on brain tumor patient and to determine the best image information through a technic to visualize the veins in brain tumor patient.Methods: This study was a quantitative study with quasi experimental approach. Data were collected in Radiology Department of Dr. Moewardi Surakarta Hospital on May to June 2016. Data was collected using questionnaire filled by three respondents. Data were analyzed statiscally using Friedman test and Wilcoxon test to determine the difference of value of Velocity Encoding (VENC) between 10 cm/sec, 15 cm/sec, 20 cm/sec, as well the mean rank test used to find out the best image information.Results: The statistical test showed that there were significant differences in image information of MRV, between VENC 10 cm/sec, 15 cm/sec and 20 cm/sec with p value was 0.032 (p˂0,05). The best result of MRV image information was when VENC value of 20 cm/sec used, indicated by the mean rank which was 2.83.Conclusion: There were significant differences of MRV image information between VENC 10 cm/sec, 15 cm/sec and 20 cm/sec. The best result of MRV image information was when VENC value of 20 cm/sec used, to visualize better anatomy of the veins, so that the presence of tumor thrombus in the veins can be ensured.
APA, Harvard, Vancouver, ISO, and other styles
10

Tsitouridis, I., P. Papapostolou, J. Rudolf, K. Natsis, L. Tarazi, F. Goutsaridou, M. Emmanouilidou, S. Chondromatidou, and C. Papastergiou. "Non-Neoplastic Dural Sinus Thrombosis." Rivista di Neuroradiologia 18, no. 5-6 (December 2005): 581–88. http://dx.doi.org/10.1177/197140090501800509.

Full text
Abstract:
Magnetic Resonance Imaging (MRI) study of the brain and Magnetic Resonance Venography (MRV) offer major advantages in evaluating patients suspected of having dural sinus thrombosis. Since 2002, we have examined 49 patients in our department with definite dural sinus thrombosis. MRI and MRV revealed the thrombosis of the dural sinus, and the underlying cause in most patients. There is consensus in the literature that MRI scanning in combination with MRV is the method of choice for evaluating dural sinus thrombosis, and this is also the end result of our study. We also compared the 3D-TOF technique and 2D-PC technique for MRV examination and found that the 3D-TOF technique is clearly the method of choice.
APA, Harvard, Vancouver, ISO, and other styles
More sources

Dissertations / Theses on the topic "MRV"

1

LACERDA, FELIPE CERQUEIRA DE. "MEANING OF HOMEOWNERSHIP FOR THE MIDDLE CLASS IN THE MRV DISCOURSE." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2016. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=27664@1.

Full text
Abstract:
Nos últimos anos, verificou-se notável crescimento do consumo da classe média brasileira que proporcionou a essa classe maior acesso na compra da casa própria. A aquisição da casa própria constitui um sonho de consumo desse extrato social e apresenta grande conotação simbólica. A construtora MRV, líder no segmento de imóveis para a classe média, com ênfase na oferta de imóveis com o perfil de primeiro apartamento do consumidor, destaca-se por suas estratégias de comunicação e por seu discurso publicitário. Neste contexto, o presente trabalho tem por objetivo identificar os significados que a compra da casa própria assume no discurso da construtora MRV em seus canais digitais. Para tal, analisou-se um corpus de vinte vídeos produzidos pela MRV e publicados em seu canal no YouTube entre os meses de Janeiro e Novembro de 2015. A abordagem da pesquisa foi qualitativa e exploratória, com utilização de análise textual verbal e visual do corpus, bem como de técnicas de análise de conteúdo. Os vídeos foram classificados em quatro categorias temáticas, a saber: Venda de Novos Empreendimentos, Entrega das Chaves, Histórias de vida de clientes MRV e Institucionais. O resultado do estudo apontou que no discurso analisado a casa própria assume diferentes significados, como: realização, identidade, independência, segurança e pertencimento. Com base na axiologia de valores de consumo proposta pelo semioticista J.M.Floch, tais significados revelam a prevalência de valores práticos, críticos e utópicos no discurso da construtora MRV.
In recent years, there has been remarkable growth of the Brazilian middle class consumption provided to this class greater access in buying a home. The acquisition of a home is a dream of consumption of this social stratum and has great symbolic connotation. MRV construction company, leader in the real estate segment for the middle class, with an emphasis on real estate supply to the first consumer flat profile, stands out for its communication strategies and their advertising discourse. In this context, this paper aims to identify the meanings that home ownership plays in the builder MRV discourse in their digital channels. To do this, we analyzed a corpus of twenty videos produced by MRV Company and published on his YouTube channel between January and November 2015. The research approach was qualitative and exploratory, using verbal and visual textual analysis of the corpus and content analysis techniques. The videos were classified into four themes, namely: Sale of New Ventures, Delivery of the Keys, Customer Life Stories MRV and Institutional. The study results showed that in the discourse examined the house itself takes on different meanings, such as: holding, identity, independence, security and belonging. Based on the axiology of consumption values proposed by J.M.Floch semiotician such meanings reveal the prevalence of practical, critical and utopian values on the MRV discourse.
APA, Harvard, Vancouver, ISO, and other styles
2

Visa, Codrut Ion Alin. "Commande non linéaire et observateurs : application à la MRV en grande vitesse." Metz, 2004. http://www.theses.fr/2004METZ026S.

Full text
Abstract:
Ce travail concerne la commande en boucle fermée d'une machine à réluctance variable (MRV) destinée à l'usinage à grande vitesse. Le principe de fonctionnement d'une MRV 6/2 et sa modélisation sont d'abord présentés. Le développement d'une commande à la fois performante et robuste dépend de la connaissance de paramètres du modèle de la MRV. L'identification sans capteur de position des paramètres de la MRV a permis d'obtenir la caractéristique électromagnétique et les paramètres mécaniques. Des phénomènes de frottement hydrodynamiques et aérodynamiques ont été mis en évidence. Le caractère fortement non linéaire d'une MRV rend son contrôle difficile. La commande en boucle fermée de la MRV à basse vitesse a montré l'intérêt de l'emploi d'une commande non linéaire linéarisante par retour d'état. Toutefois à grande vitesse, plusieurs phénomènes spécifiques limitent les performances de la MRV en boucle fermée. Ces phénomènes sont analysés à travers les résultats des simulations de commandes non linéaires linéarisante en tension et en courant. En présence d'un capteur de position un observateur à entrée inconnue est développé et expérimenté. Afin de palier le manque de capteur performant à grande vitesse, nous avons développé un observateur non linéaire d'ordre réduit. Enfin, un système de commande a été réalisé pour expérimenter les algorithmes de commande. Le système d'exploitation Linux temps réel (RTAI) combiné avec des cartes d'acquisition entrées-sorties nous a permis d'obtenir un fonctionnement avec une période d'échantillonnage de 10s. L'interface graphique et l'acquisition des données sont gérées par des processeurs distincts
This work deals with the closed loop control of a switched reluctance motor (SRM) used for high speed machining. The principle of operation of a 6/2 SRM and its model are firstly presented. The design of a performant and robust control law depends on the knowledge of the SRM model parameters. Sensorless position parameters identification has allowed to obtain the electromagnetic characteristic and the mechanical parameters. Hydrodynamic and aerodynamic friction phenomena have been highlighted. The highly nonlinear character of the SRM makes the control difficult. The closed loop control of the SRM running at low speed showed the interest of using the feedback linearizing control technique. However at high speed, several specific problems limit the drive performances in the closed loop. The main aspects of a high speed running SRM have been analysed through the results of the simulations of feedback linearizing voltage and current control law. When the position information is available, an unknown input observer has been developed and experimented. In order to tackle the lack of a performant position sensor at high speed, a nonlinear reduced order observer has been studied. Finally, a real time control system has been realized in order to test the control laws. Real time Linux (RTAI) operating system combined with the data acquisition boards have allowed to obtain 10s sampling frequency behavior of the control system. The graphical interface and data acquisition are executed by distinct processors
APA, Harvard, Vancouver, ISO, and other styles
3

Qin, Qingsong. "Characterization of mammalian orthoreovirus (MRV) induced stress granules (SGs) and implications of eIF2[alpha] phosphorylation on viral translation." [Ames, Iowa : Iowa State University], 2010. http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:3403826.

Full text
APA, Harvard, Vancouver, ISO, and other styles
4

Besbes, Mondher. "Contribution à la modélisation numérique des phénomènes couples magneto-élastiques : Application à l'étude des vibrations d'origine magnétique dans les MRV." Paris 6, 1995. http://www.theses.fr/1995PA066023.

Full text
Abstract:
Les travaux présentés dans ce mémoire traitent de la modélisation numérique dans l'hypothèse bidimensionnelle des phénomènes couples magneto-elastiques dans les dispositifs electromagnetiques. L'objectif est particulièrement cible a l'étude théorique et expérimentale des vibrations d'origine magnétique dans les machines a reluctance variable a double saillance. Dans le but de quantifier la réponse vibratoire d'une telle machine, nous avons introduit dans un code de calcul du champ magnétique, base sur la méthode des éléments finis, un module qui permet la détermination de la répartition des forces magnétiques locales pour calculer les déformations mécaniques résultantes. Le choix de la méthode de calcul de force magnétique, qui se base sur l'application locale du principe des travaux virtuels, a été justifie par la précision de cette méthode, sa generalite (milieux satures) et sa souplesse de mise en ouvre. L'analyse spectrale des forces magnétiques nous a permis de prédire quelles sont les modes de vibrations qui vont être excites. Le calcul du spectre des vibrations a été réalise en cherchant la solution de l'équation d'équilibre relative a chaque harmonique de force. Une analyse modale a été aussi effectuée pour déterminer les fréquences de résonance et les modes de vibrations associées. Parallèlement a cette approche numérique, nous avons analyse expérimentalement, en se basant sur des mesures accelerometriques, le comportement vibratoire de la machine. Grâce a cette analyse, nous avons pu valider le code de calcul des vibrations ainsi développe. L'ensemble de ces travaux a montre que la source principale du bruit acoustique, ou des vibrations qui le produisent, dans la machine d'étude réside sur l'action des forces magnétiques radiales d'attraction des dents statoriques et rotoriques en particulier lorsque celles-ci sont en conjonction. A la fin de ce mémoire, nous avons mis au point un modèle de couplage fort qui permet la résolution simultanée des problèmes couples magneto-elastiques. Ce type de modèle trouve son importance dans le cas ou les propriétés magnétiques et élastiques sont en forte interaction. Nous avons spécialement évoque dans cette partie le calcul des déformations des matériaux fortement magnétostrictifs et la résolution des problèmes de grandes déformations élastiques
APA, Harvard, Vancouver, ISO, and other styles
5

Sarr, Abdoulaye. "Amélioration de la sûreté de fonctionnement d’un actionneur électrique à réluctance variable." Thesis, Université Paris-Saclay (ComUE), 2018. http://www.theses.fr/2018SACLS533/document.

Full text
Abstract:
Le travail proposé dans cette thèse porte sur l’amélioration de l’efficacité énergétique et de la sûreté de fonctionnement de la Machine à Réluctance Variable (MRV). D’abord, nous avons présenté la commande de la MRV en modes moteur et générateur débitant sur bus continu. Pour le mode moteur, on cherche à réguler la vitesse de rotation et le couple, alors qu’en mode générateur, l’objectif de la commande est de maintenir constante la tension du bus malgré les fluctuations de la vitesse et de la charge. Une démarche itérative est proposée pour la maximisation du rendement global. Trois paramètres de réglage ont été choisis : L’angle d’amorçage (Ψ), l’angle de conduction (Θp) et le courant de référence des phases (Iref). L’efficacité de l’algorithme est évaluée à travers des simulations et des tests expérimentaux. Un rendement global maximal de 70% est atteint pour des vitesses et couples élevés. Ensuite, on s’est intéressé à la connexion de la Génératrice à Réluctance Variable (GRV) au réseau alternatif monophasé ou triphasé dans le cadre d’une application éolienne. La tension continue à la sortie de la GRV est convertie en une tension alternative par un convertisseur DC-AC. Le premier objectif est de maintenir la tension du bus continu à sa valeur nominale; le second est de contrôler la qualité du courant injecté dans le réseau. En monophasé, trois types de correcteur sont testés pour réguler le courant sinusoïdal (un correcteur PI, un correcteur Résonant et un correcteur Proportionnel-Résonant). En triphasé, une commande VQ dans le référentiel de Park est adoptée: La tension du bus continu est contrôlée à travers le courant id et la puissance réactive est contrôlée par le courant iq. Les résultats de simulation montrent qu’on obtient des courants quasi-sinusoïdaux avec un taux de distorsion harmonique inférieur à 1% aussi bien en monophasé qu’en triphasé. Enfin, pour améliorer la sûreté de fonctionnement de l’actionneur et réduire les coûts liés à l’utilisation de capteurs mécaniques, trois stratégies de commande sans capteur de position sont présentées. La première est basée sur la technique d’injection. La deuxième repose sur l’estimation du flux. La troisième s’appuie sur les observateurs adaptatifs. On trouve que la technique d’injection et la méthode basée sur la mesure du flux fonctionnent de façon complémentaire. La première est efficace en basses vitesses et ne dépend pas de la charge, la deuxième est performante en hautes vitesses et pour des charges élevées. L’observateur adaptatif proposé assure une convergence exponentielle de la position malgré le modèle analytique simplifié de l’inductance utilisé pour la synthèse. Son principal avantage réside dans sa robustesse aux variations paramétriques et au couple de charge qui est estimé
The work proposed here focuses on the improvement of the energy efficiency and the safety of the Switched Reluctance Machine (SRM). First, the control of the SRM in motor and generator modes is presented. In motor mode, the speed and the torque are regulated, while in generator mode, the objective is to keep constant the DC bus voltage. An iterative optimization algorithm is proposed formaximizing the global efficiency. The analysis of the electromechanical energy conversion has shown that there is an optimal combination of the control variables - turn on angle (Ψ), conduction angle (Θp) and reference current (Iref) – to maximize the efficiency. The strategy is evaluated using intensive numerical simulations and experimental validation. Thanks to the optimization, the global efficiency reaches 70% almost from half the nominal speed to the maximum speed. Then, the Switched Reluctance Generator (SRG) is used as an AC generator for a Wind Energy Conversion (WEC) application. The produced DC power is converted into AC power by means of voltage inverter and delivered to the AC grid. The first issue of the WEC control is to maintain constant the output DC voltage despite the wind speed variations and the load uncertainty. The second issue is to control the quality of the current. In single-phase AC network, three controllers are tested to regulate the AC current (PI controller, Resonant controller, Proportional-Resonant controller). In three-phase AC network, a VQ control in Park’s frame is adopted: The DC bus voltage is controlled through the direct current and the reactive power injected into the grid is controlled through the quadrature current. Simulation results show that quasi-sinusoidal currents with a harmonic distortion rate less than 1% are obtained in both cases. Finally, we address the problem of sensorless control. In fact, the control of the SRM requires that the rotor position is known. A mechanical encoder is used generally to measure the position. The elimination of this position sensor would reduce the cost and packaging requirements of the drive. Three methods to estimate the rotor position are presented. The first one named inductance-method is an active as it is based on the pulse injection technique. The second one named flux-method is a passive one as it used the current measurement. The third one is based on the state observers for the flux, position, and velocity and load torque estimation. The simulations results have shown that the inductance-based method is efficient in low speed region and the flux-based one is more efficient in high-speed region. It is also shown that, observers are exponentially convergent even when a simple analytical modelling, that neglects saturation effect, is used to design the observer
APA, Harvard, Vancouver, ISO, and other styles
6

Slovak, Peter Michael. "Characterisation of the mre and mrd loci of Rhodobacter sphaeroides." Thesis, University of Oxford, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.414270.

Full text
APA, Harvard, Vancouver, ISO, and other styles
7

Inturi, Satya Prakash Reddy, and Chaitanya Macherla. "System Performance of MIMO MRT/MRC System under Perfect CSI." Thesis, Blekinge Tekniska Högskola, Institutionen för datavetenskap, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:bth-21137.

Full text
Abstract:
Multiple Input and Multiple Output (MIMO) is one of the techniques used tiimprove the system performance. In this thesis, we improve and evaluate the system performance of MIMO deploying MRT technique at the transmitter and MRCtechnique at the receiver with an assuming that the system can obtain perfect CSI.We derived expressions for outage probability and symbol error rate and simulationgraphs for SISO, SIMO, MISO, and MIMO in terms of outage probability. Our results show that the MIMO system performance is better than other configurations.We also observed that SISO have the least performance where SIMO and MISOhave same performance. The performance also increases as the number of antennasincrease in the system and it is suggested to use MIMO when performance is givehigh priority than cost.
APA, Harvard, Vancouver, ISO, and other styles
8

Chalmers, Kirsten Hardie. "Fluorinated paramagnetic probes for 19-F and 1-H MRS/MRI." Thesis, Durham University, 2011. http://etheses.dur.ac.uk/879/.

Full text
Abstract:
Novel CF3-labelled lanthanide(III) complexes have been synthesised for use as probes for 19-F and 1-H magnetic resonance spectroscopy and imaging. The syntheses and evaluation of two classes of fluorinated paramagnetic complexes are defined. Notably, the 19-F magnetic resonance relaxation processes for the complexes have been assessed, allowing for the analysis of the interplay between applied field, Ln(III) ion and rotational correlation time on relaxation properties. Strategies employed to enhance signal intensity are discussed, examining a number of different of fluorinated mono- and di-amide cyclen ligands. Systems incorporating phosphinate pendant arms are of particular interest, resulting in complexes with favourable isomer distributions, faster longitudinal relaxation rates and narrower linewidths. Finally, the synthesis of high molecular weight conjugates with paramagnetic fluorinated complexes is described. Three different classes of medium to high molecular adducts were considered, with the merits and limitations of each assessed. The desirable formation of one species in solution, ease of solubility and attractive 19F and 1H relaxometric properties render the chitosan conjugates promising candidates for future use as imaging probes.
APA, Harvard, Vancouver, ISO, and other styles
9

Ramamurthy, Senthil. "Localized double-quantum filtered correlated spectroscopy on 3T MRI/MRS scanner." Morgantown, W. Va. : [West Virginia University Libraries], 2005. https://etd.wvu.edu/etd/controller.jsp?moduleName=documentdata&jsp%5FetdId=4012.

Full text
Abstract:
Thesis (M.S.)--West Virginia University, 2005.
Title from document title page. Document formatted into pages; contains ix, 69 p. : ill. (some col.). Includes abstract. Includes bibliographical references (p. 65-69).
APA, Harvard, Vancouver, ISO, and other styles
10

Chao, Hui Ph D. Massachusetts Institute of Technology. "Multi-echo methods for fast MRI and MRS of ³¹P containing compounds." Thesis, Massachusetts Institute of Technology, 1997. http://hdl.handle.net/1721.1/43335.

Full text
APA, Harvard, Vancouver, ISO, and other styles
More sources

Books on the topic "MRV"

1

Reducing Emissions from Deforestation and Forest Degradation (Program). National forest monitoring systems: Monitoring and measurement, reporting and verification (M & MRV) in the context of REDD+ activities. Geneva: UN-REDD Programme Secretariat, 2013.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
2

Kikan, Chikyū Kankyō Senryaku Kenkyū. Shin mekanizumu no kōchiku ni muketa Ajia chiki ni okeru MRV taisei kōchiku shien jigyō gyōmu hōkokusho: Heisei 23-nendo. Kanagawa-ken Miura-gun Hayama-machi: Chikyū Kankyō Senryaku Kenkyū Kikan, 2012.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
3

Kaisha, Nihon Kōei Kabushiki. Shin mekanizumu no kōchiku ni muketa kōhatsu kaihatsu tojōkoku ni okeru MRV taisei kōchiku shien oyobi hakkutsu jigyō itaku gyōmu hōkokusho: Heisei 23-nendo. [Tokyo]: Nihon Kōei Kabushiki Kaisha, 2012.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
4

Boer, Rizaldi. Review existing methodology of resource based inventory for measuring, reporting, and verifyng (MRV) carbon accounting for reducing emissions from deforestation and forest degradation and enhancing carbon stocks in Meru Betiri National Park (MBNP), Indonesia. Bogor: ITTO PD 519/08/Rev.1 (F) in cooperation with Forestry Research and Development Agency, Ministry of Forestry, Indonesia, 2010.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
5

Siṅkha, Maṅʻʺ. Mre lyhokʻ vijjā Rvhe Mra Sā: Mahāgandhārī vatthu krīʺ. Camʻʺ khyoṅʻʺ, [Rangoon]: Manomaya Cā pe, 1997.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
6

Mahajan, Sucheta. Education for social change: MVF and child labour. New Delhi: National Book Trust, 2008.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
7

vanʻʺ, Cuinʻ. Pi tokʻ mre ka ma he sī naiʹ rhve a mru te. Ranʻ kunʻ mruiʹ: Raññʻ mvanʻ Ūʺ Cā pe, 2004.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
8

Mraṅʻʹ, Taṅʻ. Sa ra phī kruiṅʻ lhuiṅʻ saṅʻʺ pā taiʹ vaṅʻʺ mra raññʻ mre. [Rangoon]: Ūʺ ʼUnʻʺ Moṅʻ, 2001.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
9

Conference, Market Research Society Annual. MRS. London: Market Research Society, 1987.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
10

Market Research Society. Annual Conference. MRS. London: Market Research Society, 1989.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
More sources

Book chapters on the topic "MRV"

1

Kim, Denise S., Remy R. Lobo, and Alon Kahana. "Orbital MRA/MRV." In Atlas of Orbital Imaging, 1–4. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-41927-1_87-1.

Full text
APA, Harvard, Vancouver, ISO, and other styles
2

Gewies, Andreas, Jürgen Ruland, Alexey Kotlyarov, Matthias Gaestel, Shiri Procaccia, Rony Seger, Shin Yasuda, et al. "MRV Integration Site 1." In Encyclopedia of Signaling Molecules, 1123. New York, NY: Springer New York, 2012. http://dx.doi.org/10.1007/978-1-4419-0461-4_100851.

Full text
APA, Harvard, Vancouver, ISO, and other styles
3

Nikitakos, Nikitas, Dimitrios Dalaklis, and Petros Siousiouras. "Real Time Awareness for MRV Data." In Trends and Challenges in Maritime Energy Management, 53–63. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-74576-3_5.

Full text
APA, Harvard, Vancouver, ISO, and other styles
4

Psaraftis, Harilaos N., and Poul Woodall. "Reducing GHGs: The MBM and MRV Agendas." In Sustainable Shipping, 375–405. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-04330-8_11.

Full text
APA, Harvard, Vancouver, ISO, and other styles
5

Alexandre Ferreira, Hugo, and Joana N. Ramalho. "Basic Principles of Phase Contrast Magnetic Resonance Angiography (PC MRA) and MRV." In Vascular Imaging of the Central Nervous System, 137–45. Oxford, UK: John Wiley & Sons, Ltd, 2013. http://dx.doi.org/10.1002/9781118434550.ch8.

Full text
APA, Harvard, Vancouver, ISO, and other styles
6

Castillo, Mauricio, Juan Camilo Márquez, and Francisco José Medina. "Time-of-Flight Magnetic Resonance Angiography (TOF MRA) and MRV: Clinical Applications." In Vascular Imaging of the Central Nervous System, 146–60. Oxford, UK: John Wiley & Sons, Ltd, 2013. http://dx.doi.org/10.1002/9781118434550.ch9.

Full text
APA, Harvard, Vancouver, ISO, and other styles
7

Alexandre Ferreira, Hugo, and Joana N. Ramalho. "Basic Principles of Time-of-Flight Magnetic Resonance Angiography (TOF MRA) and MRV." In Vascular Imaging of the Central Nervous System, 125–36. Oxford, UK: John Wiley & Sons, Ltd, 2013. http://dx.doi.org/10.1002/9781118434550.ch7.

Full text
APA, Harvard, Vancouver, ISO, and other styles
8

Amellina, Aryanie. "Enhancing the Joint Crediting Mechanism MRV to Contribute to Sustainable Development." In Evaluating Climate Change Action for Sustainable Development, 111–27. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-43702-6_7.

Full text
APA, Harvard, Vancouver, ISO, and other styles
9

Krisnawati, Haruni, Wahyu Catur Adinugroho, and Rinaldi Imanuddin. "Climate-Responsible Management of Tropical Peatlands: The Need for Integrated MRV for Tropical Peatland Ecosystem." In Tropical Peatland Eco-management, 443–62. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-33-4654-3_15.

Full text
APA, Harvard, Vancouver, ISO, and other styles
10

Chang, David S., Foster D. Lasley, Indra J. Das, Marc S. Mendonca, and Joseph R. Dynlacht. "MRI-Linear Accelerator (MRL)." In Basic Radiotherapy Physics and Biology, 175–84. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-61899-5_17.

Full text
APA, Harvard, Vancouver, ISO, and other styles

Conference papers on the topic "MRV"

1

Benson, Michael, Daniel Chung, Gabriel Fuhrman, David Helmer, Ty Homan, Lynne Mooradian, Joshua Rhee, Christopher Elkins, and Andrew Banko. "Three-Dimensional Concentration and Velocity Measurements of a Pulsatile Contaminant Release in a Model of Oklahoma City." In ASME 2020 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/imece2020-23648.

Full text
Abstract:
Abstract Motivated by the Joint Urban 2003 field project and subsequent studies, magnetic resonance imaging (MRI) techniques were used to collect full-field measurements of three-dimensional fluid velocity and concentration across a scaled model of 2003 Oklahoma City. The study was intended to develop, test, and demonstrate a repeatable puff release with MRI compatible equipment. In order to accomplish this, a contaminant was injected through the floor of a city model in discrete puffs using a solenoid valve. Sealed to fit inside a water channel, the 1:2,206 scale city model covered the central business district of the city as it was in 2003. The main flow was fully turbulent with a Reynolds number of 36,000, while vertical puff injection occurred at a Reynolds number of 2,642. Using MRV and MRC methods, the three components of velocity and concentration were measured at more than 2 million locations for each of the 12 phases of the injection period. MRV measurements examined the fluid flow with respect to building geometry. Collected at heights corresponding to this MRV data, MRC measurements enabled the analysis of the vertical and lateral dispersion of the contaminant. Ultimately, the study demonstrated a novel MRI technique through contaminant puff release and can be used for the validation of urban contaminant dispersion models.
APA, Harvard, Vancouver, ISO, and other styles
2

Benson, Michael J., Bret P. Van Poppel, Christopher J. Elkins, and Mark Owkes. "Three Dimensional Velocity and Temperature Field Measurements of Internal and External Turbine Blade Features Using Magnetic Resonance Thermometry." In ASME Turbo Expo 2018: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/gt2018-76874.

Full text
Abstract:
Magnetic Resonance Thermometry (MRT) is a maturing diagnostic used to measure three-dimensional temperature fields. It has great potential for investigating fluid flows within complex geometries leveraging medical grade MRI equipment and software along with novel measurement techniques. The efficacy of the method in engineering applications increases when coupled with other well established MRI-based techniques such as Magnetic Resonance Velocimetry (MRV). In this study, a challenging geometry is presented with direct application to a complex gas turbine blade cooling scheme. Turbulent external flow with a Reynolds number of 136,000 passes a hollowed NACA-0012 airfoil with internal cooling features. Inserts within the airfoil, fed by a second flow line with an average temperature difference of 30 K from the main flow and a temperature-dependent Reynolds number in excess of 1,800, produce a conjugate heat transfer scenario including impingement cooling on the inside surface of the airfoil. The airfoil cooling scheme also includes zonal recirculation, surface film cooling, and trailing edge ejection features. The entire airfoil surface is constructed of a stereolithography resin — Accura 60 — with low thermal conductivity. The three-dimensional internal and external velocity field is measured using MRV. The fluid temperature field is measured within and outside of the airfoil with MRT and the results are compared with a computational fluid dynamics (CFD) solution to assess the current state of the art for combined MRV/MRT techniques for investigating these complex internal and external flows. The accompanying CFD analysis provides a prediction of the velocity and temperature fields, allowing for errors in the MRT technique to be estimated.
APA, Harvard, Vancouver, ISO, and other styles
3

Riegler, Andreas, Andrew L. Kun, Stephen Brewster, Andreas Riener, Joe Gabbard, and Carolin Wienrich. "MRV 2019." In AutomotiveUI '19: 11th International Conference on Automotive User Interfaces and Interactive Vehicular Applications. New York, NY, USA: ACM, 2019. http://dx.doi.org/10.1145/3349263.3350758.

Full text
APA, Harvard, Vancouver, ISO, and other styles
4

Issakhanian, Emin, Chris J. Elkins, and John K. Eaton. "Magnetic Resonance Imaging Studies of Flow and Mixing for Single-Hole Film Cooling." In ASME 2011 Turbo Expo: Turbine Technical Conference and Exposition. ASMEDC, 2011. http://dx.doi.org/10.1115/gt2011-45134.

Full text
Abstract:
Magnetic resonance imaging (MRI) measurement techniques are used to reveal the coupled 3D velocity and coolant concentration fields for a single film cooling hole with L/D of 4, ejection angle of 60°, and blowing ratios of 0.5 and 1. The jet exits into a boundary layer with momentum thickness of 0.1D. Magnetic resonance velocimetry (MRV) measures 3 component mean velocity everywhere within the channel, cooling hole, and feed plenum. Magnetic resonance concentration (MRC) provides the coolant concentration distribution which is directly analogous to film cooling effectiveness. The coupled velocity and concentration show that high velocity ratios lead to a detached jet which lowers effectiveness. Vorticity from the feed hole creates a streamwise oriented counter rotating vortex pair which lifts the coolant stream from the surface and sweeps in main channel flow inducing a kidney-shape to the coolant jet cross-section. Without the need for optical access, MRV allows study of the flow inside the feed hole including the entrance separation and secondary flows. Cross-stream feeding of the cooling hole shows added spanwise asymmetry at the hole entrance, but this asymmetry is significantly reduced moving up the hole.
APA, Harvard, Vancouver, ISO, and other styles
5

Siekman, Mike, David Helmer, Wontae Hwang, Gregory Laskowski, Ek Tsoon Tan, and Gregory Natsui. "A Combined CFD/MRV Study of Flow Through a Pin Bank." In ASME Turbo Expo 2014: Turbine Technical Conference and Exposition. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/gt2014-25350.

Full text
Abstract:
RANS and time averaged URANS simulations of a pin bank are compared quantitatively and qualitatively to full 3D mean velocity field data obtained using magnetic resonance velocimetry (MRV). The ability of the CFD to match MRV velocity profiles through the pin bank is evaluated using the SST turbulence model. Quantitative comparisons of the velocity profiles showed an overprediction of peak velocity by the CFD at the first pin rows, and a smaller oscillatory error that diminishes as it moves through the pins, resulting in better matching towards the exit.
APA, Harvard, Vancouver, ISO, and other styles
6

Issakhanian, Emin, Christopher J. Elkins, and John K. Eaton. "Pitfalls of Fan-Shaped Hole Design: Insights From Experimental Measurement of In-Hole Flow Through MRV." In ASME Turbo Expo 2017: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/gt2017-63679.

Full text
Abstract:
Film cooling jets from discrete round holes are very susceptible to jet lift-off which reduces surface effectiveness. Since the experiments of Goldstein et al. (1974), shaped holes have become prominent for improved coolant coverage. Fan-shaped holes are the most common design and have shown good improvement over round holes. However, fan-shaped holes introduce additional parameters to the already complex task of modeling cooling effectiveness. This study presents velocity and vorticity fields measured using high-resolution magnetic resonance velocimetry (MRV) to study three different fan-shaped hole geome tries at two blowing ratios. Because MRV does not require line of sight, it provides otherwise hard to obtain experimental data of the flow within the film cooling hole in addition to the mainflow measurements. By allowing measurement within the cooling hole, MRV shows how poor choice of diffuser start point and angle can be detrimental to film cooling if overall hole length and cooling flow velocity are not properly accounted for in the design. The downstream effect of these choices on the jet height and counter-rotating vortex pair is also observed.
APA, Harvard, Vancouver, ISO, and other styles
7

Williams, Elliott T., Daniel C. Caniano, Gregory Davis, Angus M. Ferrell, Michael J. Benson, Bret P. Van Poppel, and Christopher J. Elkins. "Three Dimensional Measurements of a Turbine Blade Using Magnetic Resonance Thermometry and Magnetic Resonance Velocimetry." In ASME 2017 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/imece2017-71482.

Full text
Abstract:
A hollowed NACA-0012 airfoil with removable inserts was developed to study the complex flow through two interior chambers. The geometry represented an internally cooled gas turbine blade with internal impingement in several locations. A fully turbulent water flow passed the airfoil. Within the airfoil, a second fluid at a different temperature was mixed through the insert nearest the leading edge and recirculated to the aft chamber for additional internal cooling before exiting the airfoil as film cooling on the suction side and at the trailing edge. Time-averaged, three-dimensional temperature and three-component velocity measurements were collected using Magnetic Resonance Imagery (MRI) based techniques. Magnetic Resonance Velocimetry (MRV) and Thermometry (MRT) are techniques for measuring the velocity and temperature of fully turbulent flows at sub-millimeter-scale resolution. The benefits of these techniques over similar measuring techniques include the ability to collect full-field, three-dimensional, nonintrusive, non-optical measurements for conjugate heat transfer simulation validation in complex, turbulent flows. Multiple MRI-based techniques can be combined within the same experiment to explore the interaction between the mean fields of multiple quantities. The experimental setup employed in this work produced time-averaged velocity and temperature data illustrating flow details through the airfoil’s interior chambers and heat flux through the entire airfoil and at specific locations.
APA, Harvard, Vancouver, ISO, and other styles
8

A. de Mesquita, Vinícius, Jucelino Taleires Filho, Fabrício G. Nogueira, and Bismark C. Torrico. "Controle LPV aplicado a uma máquina de relutância variável 6/4." In Congresso Brasileiro de Automática - 2020. sbabra, 2020. http://dx.doi.org/10.48011/asba.v2i1.1583.

Full text
Abstract:
Este artigo apresenta um controlador Linear com Parâmetros Variáveis (LPV) robusto na estrutura RST (Reference Signal Tracking) para o controle de velocidade de uma Máquina de Relutância Variável (MRV) 6/4. Esta máquina possui um simulador que considera as não linearidades presentes na operação da MRV. A dinâmica da malha de velocidade foi baseada em um modelo ARX LPV identificado para uma determinada faixa de operação a partir de dados coletados em simulação, sendo o nível de corrente normalizado e filtrado o parâmetro variante. Em posse dos parâmetros do modelo, os parâmetros do controlador LPV foram determinados por meio de um problema de otimização convexa, na forma de uma LMI parametrizada (PLMI). Desse modo, foi observado o desempenho do controlador LPV submetido à variação dos parâmetros e comparado com controladores convencionais com parâmetros fixos.
APA, Harvard, Vancouver, ISO, and other styles
9

Elkins, Christopher J., John K. Eaton, and Ryan B. Wicker. "Rapid Experimentation in Complex Internal Flow Passages Using SLA and MRV." In ASME/JSME 2003 4th Joint Fluids Summer Engineering Conference. ASMEDC, 2003. http://dx.doi.org/10.1115/fedsm2003-45576.

Full text
Abstract:
Designing complex internal cooling passages is extremely difficult without detailed information about the flow behavior due to the presence of separated flow zones and strong secondary flows. This paper describes a new approach to designing internal flow passages called Rapid Iterative Design Using Experimentation (RIDUE). RIDUE utilizes rapid prototyping (RP) manufacturing to quickly build an accurate model of a complex internal flow passage and magnetic resonance velocimetry (MRV) to measure the full three dimensional velocity field. Because both techniques offer very fast turnaround, it is feasible to conduct iterative design with a cycle time of 1–2 days. RIDUE is demonstrated using a generic turbine blade internal cooling passage with four serpentine channels. Two channels have rectangular cross-section and two are square. In each channel, two of the four walls have ribs (also called turbulators) angled at 45 degrees to the main flow direction. Two models based on the generic geometry are studied, each with different turbulator cross-sections, one square and one rounded. Both models were built using a stereo lithography apparatus. MRV provided three-component velocity vectors for flow at a Reynolds number of 10,000 based on the hydraulic diameter of the first passage. Sample vector fields are presented to illustrate the detail with which the flow can be investigated. Although little difference is seen in the flows between the two models, it is demonstrated that through its use of RP processes and the MRV measurement technique, RIDUE is a viable technique for modern internal passage design.
APA, Harvard, Vancouver, ISO, and other styles
10

Chung, Daniel. "Three-Dimensional Velocity Field Measurements in Rugged Terrain Using Magnetic Resonance Velocimetry." In ASME 2019 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/imece2019-11729.

Full text
Abstract:
Abstract Magnetic resonance imaging techniques were used to collect three-dimensional velocity data measurements of scaled models of a canyon in New Mexico to compare to simulations where a gas was released inside the canyon. The first canyon model covers an area of 1850m × 1030m with a scale of 1:5250 while the second model covers an area of 290m × 160m with a scale of 1:825. A fully turbulent flow with a Reynolds number of 36,000 using the channel hydraulic diameter passes through the canyon geometry for both models. With Magnetic Resonance Velocimetry (MRV), more than 13 million data points were measured to represent flow velocity. The MRV experiment with the 1:5250 scale model helped to identify key terrain features to be included in the next set of measurements of a higher resolution model. MRV not only served as a method of analysis but also as a method for design. The analysis of the data resulted in a new design of a 1:825 scale, which had a higher resolution of the terrain surrounding the gas release point. The preliminary scans from the 1:825 scale model showed a much more dynamic flow around the release point than observed in the 1:5250 scale model. Counter-rotating vortices and circulation can be observed in the 1:825 scale model. This data set will be used to compare to Sandia National Laboratories’ simulations of turbulent flows in a complex terrain.
APA, Harvard, Vancouver, ISO, and other styles

Reports on the topic "MRV"

1

Mawalkar, Sanjay, Autumn Haagsma, and Neeraj Gupta. Monitoring, Reporting, and Verification (MRV) Plan - Meeting EPA Guidelines for GHGRP and Subpart RR. Office of Scientific and Technical Information (OSTI), September 2020. http://dx.doi.org/10.2172/1773379.

Full text
APA, Harvard, Vancouver, ISO, and other styles
2

Ahonen, Hanna-Mari. Exploring practical experience of Nationally Appropriate Mitigation Actions (NAMAs) and Measurement, Reporting and Verification (MRV) requirements. Nordic Council of Ministers, 2014. http://dx.doi.org/10.6027/na2013-906.

Full text
APA, Harvard, Vancouver, ISO, and other styles
3

Wilkes, A., W. Shiping, T. Tennigkeit, and F. Jiexi. Agricultural monitoring and evaluation systems: what can we learn for the MRV of agricultural NAMAs? ICRAF Working paper no. 126. World Agroforestry Centre (ICRAF), 2011. http://dx.doi.org/10.5716/wp11045.pdf.

Full text
APA, Harvard, Vancouver, ISO, and other styles
4

Hena, Ismat, Ubaidur Rob, Nargis Sultana, Md Hossain, Reena Yasmin, Tapash Das, and Farid Ahmed. Introducing medical MR in Bangladesh: MRM final report. Population Council, 2013. http://dx.doi.org/10.31899/rh4.1061.

Full text
APA, Harvard, Vancouver, ISO, and other styles
5

Espy, Michelle A. Portable MRI. Office of Scientific and Technical Information (OSTI), June 2012. http://dx.doi.org/10.2172/1045388.

Full text
APA, Harvard, Vancouver, ISO, and other styles
6

Wroblewski, Angela, and Victoria Englmaier. Absolventinnenbefragung muv. IHS - Institute for Advanced Studies, February 2017. http://dx.doi.org/10.22163/fteval.2017.499.

Full text
Abstract:
Despite some successes, however, there are still barriers for women at universities, which are reflected in the so-called "leaky pipeline", i.e. a decreasing proportion of women the higher their position in the science system. The University of Vienna is also characterised by a pronounced leaky pipeline. The mentoring programme of the University of Vienna - muv - was launched to counteract this development and to support women in entering an academic career. The programme has been continuously evaluated and further developed. This report continues this tradition and provides input for a discussion on the further development of the programme.
APA, Harvard, Vancouver, ISO, and other styles
7

Esserman, Laura J., Shelley Hwang, and Nola Hylton. A New Perspective on DCIS Using MRI: Correlation of Tumor and Vessel Proliferation with MR Signal Enhancement. Fort Belvoir, VA: Defense Technical Information Center, October 2001. http://dx.doi.org/10.21236/ada406087.

Full text
APA, Harvard, Vancouver, ISO, and other styles
8

Esserman, Laura J., and Nola Hylton. A New Perspective on DCIS Using MRI: Correlation of Tumor and Vessel Proliferation with MR Signal Enhancement. Fort Belvoir, VA: Defense Technical Information Center, October 2002. http://dx.doi.org/10.21236/ada412770.

Full text
APA, Harvard, Vancouver, ISO, and other styles
9

Esserman, Laura J. A New Perspective on DCIS Using MRI: Correlation of Tumor and Vessel Proliferation with MR Signal Enhancement. Fort Belvoir, VA: Defense Technical Information Center, April 2004. http://dx.doi.org/10.21236/ada425879.

Full text
APA, Harvard, Vancouver, ISO, and other styles
10

Phillips, Peter C. Early Detection of NF1 Brain Tumor Growth and Treatment Response by MRI, MRS and PET in a Trial of Novel Antitumor Drugs. Fort Belvoir, VA: Defense Technical Information Center, October 1997. http://dx.doi.org/10.21236/ada376214.

Full text
APA, Harvard, Vancouver, ISO, and other styles
You might also be interested in the extended bibliographies on the topic 'MRV' for particular source types:
Journal articles Dissertations / Theses Books
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!

To the bibliography