Littérature scientifique sur le sujet « Ngc 454 »
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Articles de revues sur le sujet "Ngc 454"
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Plana, H., R. Rampazzo, P. Mazzei, A. Marino, Ph Amram et A. L. B. Ribeiro. « The NGC 454 system : anatomy of a mixed ongoing merger ». Monthly Notices of the Royal Astronomical Society 472, no 3 (14 août 2017) : 3074–92. http://dx.doi.org/10.1093/mnras/stx2091.
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Marchese, E., V. Braito, R. Della Ceca, A. Caccianiga et P. Severgnini. « NGC 454 : unveiling a new ‘changing look’ active galactic nucleus ». Monthly Notices of the Royal Astronomical Society 421, no 2 (9 février 2012) : 1803–12. http://dx.doi.org/10.1111/j.1365-2966.2012.20445.x.
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Stiavelli, M., N. Panagia, C. Marcella Carollo, M. Romaniello, I. Heyer et S. Gonzaga. « WFPC2 Observations of NGC 454 : An Interacting Pair of Galaxies ». Astrophysical Journal 492, no 2 (10 janvier 1998) : L135—L138. http://dx.doi.org/10.1086/311115.
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Iyomoto, N., K. Makishima, M. Tashiro, K. Matsushita, Y. Fukazawa, H. Kaneda et S. Osone. « Evidence for a Dramatic Activity Decline in the Nucleus of the Radio Galaxy Fornax A ». Symposium - International Astronomical Union 188 (1998) : 446. http://dx.doi.org/10.1017/s0074180900115955.
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Fornax A (NGC 1316) is a radio galaxy with prototypical double lobes. Feigelson et al. (1995 ApJ 449, L149) and Kaneda et al. (1995 ApJ 454, L13) detected inverse Compton X-rays for the first time from its radio lobes, and unambiguously derived the lobe magnetic field intensity of 2-4 μG. Accordingly, the radio-emitting electrons in the lobes are inferred to have a Lorentz factor of 104, and hence a synchrotron life time of ~108 yr. This means that Fornax A was highly active at least 108 years ago.
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Teixeira, Paula S., Charles J. Lada, Kenneth Wood, Thomas P. Robitaille et Kevin L. Luhman. « INFRARED SPECTROGRAPH CHARACTERIZATION OF A DEBRIS DISK AROUND AN M-TYPE STAR IN NGC 2547 ». Astrophysical Journal 700, no 1 (2 juillet 2009) : 454–59. http://dx.doi.org/10.1088/0004-637x/700/1/454.
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Fritzewski, D. J., S. A. Barnes, D. J. James, S. P. Järvinen et K. G. Strassmeier. « A detailed understanding of the rotation-activity relationship using the 300 Myr old open cluster NGC 3532 ». Astronomy & ; Astrophysics 656 (décembre 2021) : A103. http://dx.doi.org/10.1051/0004-6361/202140896.
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Context. The coeval stars of young open clusters provide insights into the formation of the rotation-activity relationship that elude studies of multi-age field populations. Aims. We measure the chromospheric activity of cool stars in the 300 Myr old open cluster NGC 3532 in concert with their rotation periods to study the mass-dependent morphology of activity for this transitional coeval population. Methods. Using multi-object spectra of the Ca II infrared triplet region obtained with the AAOmega spectrograph at the 4 m Anglo-Australian Telescope, we measure the chromospheric emission ratios RIRT′ for 454 FGKM cluster members of NGC 3532. Results. The morphology of activity against colour appears to be a near-mirror image of the cluster’s rotational behaviour. In particular, we identify a group of ‘desaturated transitional rotators’ that branches off from the main group of unsaturated FGK slow rotators, and from which it is separated by an ‘activity gap’. The few desaturated gap stars are identical to the ones in the rotational gap. Nevertheless, the rotation-activity diagram is completely normal. In fact, the relationship is so tight that it allows us to predict rotation periods for many additional stars. We then precisely determine these periods from our photometric light curves, allowing us to construct an enhanced colour-period diagram that represents 66% of the members in our sample. Our activity measurements show that all fast rotators of near-solar mass (F-G type) have evolved to become slow rotators, demonstrating that the absence of fast rotators in a colour-period diagram is not a detection issue but an astrophysical fact. We also identify a new population of low-activity stars among the early M dwarfs, enabling us to populate the extended slow rotator sequence in the colour-period diagram. Conclusions. The joint analysis of chromospheric activity and photometric time series data thus enables comprehensive insights into the evolution of the rotation and activity of stars during the transitional phase between the Pleiades and Hyades ages.
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Urbanik, M., M. Soida et R. Beck. « Magnetic Fields and the Interstellar Medium in Spiral Arms ». Symposium - International Astronomical Union 171 (1996) : 456. http://dx.doi.org/10.1017/s0074180900233743.
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We performed the high frequency radio studies of spiral galaxies using the 100 m MPIfR radio telescope at 10.55 GHz. Two objects: NGC 4254 and NGC 3627 possess perturbed spiral structures while two others, NGC 3521 and NGC 5055 are flocculent objects, lacking organized spiral patterns. NGC 3521 possesses also a peculiar dust lane. For NGC 4254, NGC 3627 and NGC 5055 deep polarization maps were made, for NGC 3521 the total power data only were analyzed (see Urbanik et al. 1989).
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Mayya, Y. D., et T. N. Rengarajan. « 7.9. Far-infrared emission and gas to dust ratio in discs and central regions of galaxies ». Symposium - International Astronomical Union 184 (1998) : 309–10. http://dx.doi.org/10.1017/s0074180900085053.
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We study the radial profiles of radio comtinuum (RC) and far-infrared (FIR) emissions and also the gas to dust ratio for a sample of 22 spiral galaxies. For this, we use the data from IRAS HiRES FIR maps, available VLA 20 cm maps and radial profile data available on neutral hydrogen (H) and molecular hydrogen (H2, derived from velocity integrated CO intensity). In order to have enough resolution with the 1-1.5 arcminute IRAS beam, the galaxies chosen were large sized and had a 60 μm flux density of more than 5 Jy. The sample consists of: NGC 628, NGC 2403, NGC 2841, NGC 2903, NGC 3079, NGC 3198, NGC 3627, NGC 3628, NGC 4192, NGC 4254, NGC 4303, NGC 4321, NGC 4501, NGC 4535, NGC 4569, NGC 4656, NGC 4736, NGC 5033, NGC 5055, NGC 6503, NGC 6946 and NGC 7331. For 13 of these galaxies information is also available on metallicity (z) and V band CCD maps.
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Plana, H., et J. Boulesteix. « Scanning Fabry-Perot observations of multiple profiles of faint and extended gas in the center of elliptical galaxies ». International Astronomical Union Colloquium 149 (1995) : 133–37. http://dx.doi.org/10.1017/s0252921100022806.
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AbstractSome elliptical galaxies possess an extended gaseous disk which is usually detected from Hα and [Nil] emission. 3-D ”Cigale” observations of two of these objects, NGC 1052 and NGC 404, show the evidence of peculiar dynamics a nd in one case multiple profiles of faint extended gas which are probably from different origins. In NGC 1052, the decoupled kinematics of the gas and the stellar systems favors the hypothesis of an external origin of the interstellar matter, while in NGC 404, coherence of the stars and gas axis, as well as the low gas velocity dispersion favors an inner origin of the gas from the stars themselves.
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Puerari, Ivânio, Margarita Valdez-Gutiérrez et Izbeth Hernández-López. « A Fourier Analysis of the Interacting Pair of Galaxies KPG 404 (NGC 5394/95) ». Symposium - International Astronomical Union 217 (2004) : 426–27. http://dx.doi.org/10.1017/s0074180900198109.
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We present a bi-dimensional Fourier analysis of near-infrared images of KPG 404 (NGC 5394/95). The 2D Fourier analysis shows that NGC 5394 is a H2β galaxy in the DP classification (Block & Puerari 1999). In contrast, NGC 5395 displays a very complex structure which needs a number of Fourier coefficients to be explained. A tightly wound m = 1 (DP class H1α) is the main structure, but other m = 1 and m = 2 coefficients (suggesting spiral arm modulation) are also present in the Fourier spectra. The complex structure of NGC 5395 also suggests a strong interaction in the pair. The m = 1 coefficients can represent a pseudo ring-type structure, resulting of a collision rather than a grazing passage. We conclude that the most probable scenario of the interaction in this pair should take into account a crossing of NGC 5394 through the disk of NGC 5395.
Thèses sur le sujet "Ngc 454"
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MARCHESE, ELENA. « X-ray absorption in Active Galactic Nuclei ». Doctoral thesis, Università degli Studi di Milano-Bicocca, 2015. http://hdl.handle.net/10281/89114.
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I Nuclei Galattici Attivi (AGN) sono tra le sorgenti più luminose dell’Universo e sono osservati in circa 10-20% delle galassie nell’Universo locale. Il meccanismo di generazione dell’energia di queste sorgenti è l’accrescimento di materia su un buco nero supermassivo (SMBH). Secondo il paradigma del Modello Unificato (UM) il SMBH è circondato da un assorbitore uniforme e anisotropo di gas e polveri, con geometria toroidale, che si estende da 1pc a 100pc. Anche se a livello generale l’UM è corretto, lavori recenti hanno evidenziato la necessità di formulare modelli alternativi per spiegare ad esempio la presenza di molteplici assorbitori disomogenei, a diverse distanze dal SMBH e in diversi stati fisici.
Tra le argomentazioni in conflitto con l’UM vi è la variabilità spesso osservata negli spettri X degli AGN. Quando non deriva da una variazione intrinseca dell’emissione nucleare, essa implica che l’assorbitore è ‘’clumpy’’ e non è uniforme. Vari studi hanno anche mostrato che l’assorbitore non è sempre neutro: sono stati osservati outflow di grandi quantità di materiale parzialmente ionizzato (noti come “warm absorbers”) con velocità di outflow tra 100 e 1000 km/s, in circa il 50% degli AGN di tipo 1. Un’ulteriore complessità è rappresentata dalle osservazioni di assorbitori altamente ionizzati con alte velocità di outflow (vout>3000 km/s) noti come “ultrafast outflows”.
La mia tesi si occupa della variabilità di assorbimento osservata negli spettri X degli AGN, fondamentale per testare le dimensioni, la struttura e la composizione della materia circumnucleare. In dettaglio, ho analizzato lo spettro X di due AGN, NGC 454E e Mrk 348, per cui sono disponibili dati dei satelliti Swift-BAT, Suzaku e XMM-Newton. NGC 454E è una galassia di Seyfert 2, parte di un sistema di galassie interagenti, a z=0.0122. Confrontando gli spettri di Suzaku e XMM, con distanza temporale di 6 mesi, ho notato un forte cambiamento della curvatura spettrale tra 3 keV e 6 keV. La sua origine è riconducibile a una variazione importante della densità colonnale dell’assorbitore neutro, che ha permesso di classificare NGC 454E come “changing-look AGN”. Inoltre, lo spettro di XMM mostra segni della presenza di un assorbitore ionizzato, assente durante l’osservazione di Suzaku, con un limite superiore sulla distanza di circa 0.001 pc.
Mrk 348 è una galassia classificata come Seyfert 2, a z=0.015. Il suo spettro è caratterizzato da tre diversi assorbitori, uno neutro e due ionizzati, con diverse densità e stati di ionizzazione, ma con circa la stessa velocità di outflow (∼0.05c). Le distanze degli assorbitori ionizzati dal SMBH sono probabilmente differenti, in quanto i limiti superiori sono trovati essere di 0.026pc per l’assorbitore di più alta ionizzazione e 2.72pc per quello di media ionizzazione. Anche Mrk 348 presenza una variazione della densità colonnale tra Suzaku e XMM, sia per l’assorbitore neutro che per quello di media ionizzazione. Questi studi costituiscono un passo in avanti per definire un modello alternativo all’UM, per cui ci sono sempre più prove che la regione circumnucleare è composta da diversi assorbitori, a diverse distanze e stati di ionizzazione.Active Galactic Nuclei (AGN) are among the most energetic sources in the Universe, and they are observed in about 10-20% of the galaxies in the local Universe. Their energy generation mechanism is accretion of matter on a central Supermassive Black Hole (SMBH). According to the most accredited paradigm, the Unified Model (UM), the SMBH is surrounded by an anisotropic uniform absorber of gas and dust, with a toroidal geometry, extending from 1 pc to 100 pc. Even if on a basic level the UM is correct, the need for alternative models was highlighted by the detection of several dishomogeneous absorbers, located at different distances from the SMBH, and at different physical states. Among the arguments in conflict with the UM there is the variability often observed in the X-ray spectra of AGN. When not resultant from an intrinsic variation of the nuclear emission, it implies that the underlying absorber is clumpy and not uniform. Many studies also showed that, besides being clumpy, the absorbing material is not always completely neutral. Significant amounts of outflowing partially-ionized material have been detected in about ∼50% of Type 1 AGN. These ionized absorbers are called “warm absorbers” and have outflow velocities in the range ∼100−1000 km/s. Furthermore, highly ionized absorbers with high outflow velocities (vout>3000 km/s, “ultrafast outflows”) have been observed. This thesis focuses on observations of absorption variability in the X-ray spectra of AGN, as a useful “tool” to test the size, structure and composition of the circumnuclear medium. In detail, I analysed the X-ray spectra of two AGN, NGC 454E and Mrk 348, for which X-ray data from Swift-BAT, Suzaku and XMM-Newton were available. NGC 454E is a red elliptical Seyfert galaxy in an interacting system, at z=0.0122. When comparing the Suzaku and XMM-Newton spectra, observed with 6 months delay, I noticed a dramatic change in the spectral curvature between 3 keV and 6 keV. The origin of the variability was due to a strong change of the column density of a neutral absorber, that allowed to classify NGC 454E as a “changing-look AGN”. Moreover, the XMM-Newton spectrum showed clear signatures of the presence of an ionised absorber, absent during Suzaku observation. An upper limit on its distance was inferred to be ∼0.001 pc. Mrk 348 is a bright Compton-thin Seyfert 2 galaxy at z=0.015. I found that its spectrum is characterized by three different absorbers, one neutral and two ionised, with different densities and ionisation states, but with approximately the same outflow velocity (∼0.05c). The distances of the ionised absorbers from the central emitting region are likely to be different, indeed the upper limits I find are 0.026 pc for the highly ionised absorber, and 2.72 pc for the mildly ionised one. A variation of the column density is present also for Mrk 348, both for the neutral absorber and for the mildly ionized. Both these studies are a step forwards in the definition of an alternative model to the UM, for which more and more evidences are being collected, denoting that the absorbing material is composed by multiple absorbers at different distances, densities and ionization states.
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Guedes, Fernanda Alves de Freitas. « Pirossequenciamento do transcriptoma de folha de Lippia alba por meio da plataforma 454 GS FLX (Roche) ». Universidade Federal de Juiz de Fora (UFJF), 2011. https://repositorio.ufjf.br/jspui/handle/ufjf/2496.
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Lippia alba, também conhecida popularmente como erva cidreira, é uma espécie amplamente distribuída pelas Américas podendo ser encontrada por praticamente todo o Brasil. Muito usada pela medicina popular para o tratamento de problemas gastrointestinais e respiratórios, a folha desta espécie produz um óleo essencial rico em terpenos, principalmente mono e sesquiterpenos. Estes compostos não são apenas de interesse farmacológico, como também industrial. A composição deste óleo pode variar em função de fatores abióticos e também de variações genotípicas. Diante da complexidade da síntese destes compostos a proposta deste trabalho foi uma ampla caracterização do transcriptoma de folha de Lippia alba, além da identificação de prováveis enzimas envolvidas na síntese de terpenos. Para isso, foi feito um sequenciamento deste transcriptoma usando a plataforma 454 (Roche) seguido de uma montagem de novo. Esta plataforma tem sido cada vez mais utilizada para o sequenciamento de transcriptomas numa abordagem conhecida como RNA-Seq. O sequenciamento de biblioteca preparada a partir de RNA total em 1/8 de placa gerou 104.631 leituras com comprimento médio de 184,48bp num total de 19.302.161 bases. Foram feitas montagens das leituras usando 2 diferentes assemblers a fim de compará-las. Com o Newbler 2.5 foi possível montar 2.686 contigs com comprimento médio de 349bp, enquanto o SeqMan2.2 gerou 13.448 contigs com média de 284bp. Em seguida, foi feita a anotação funcional com o Blast2GO para os contigs obtidos nas duas montagens, tendo sido anotados 51,49% e 30,88%, respectivamente, dos contigs do Newbler e do SeqMan. Por fim, a análise das sequências anotadas revelou algumas enzimas potencialmente envolvidas com a síntese de terpenos. Os resultados obtidos neste estudo pioneiro sobre a espécie comprovam que as tecnologias NGS podem ser uma ferramenta bastante eficiente para o sequenciamento de transcriptomas e servirão como referência para o preparo mais específico de novas bibliotecas. Futuros sequenciamentos devem contribuir para uma melhor cobertura do transcriptoma permitindo a descoberta inclusive de transcritos raros.
Lippia alba, popularly known as erva cidreira, is widely distributed throughout the Americas and can be found through almost whole Brazil. This species is largely used in folk medicine to treat gastrointestinal and respiratory problems, especially leaves, which produce an essential oil rich in terpenes, mainly mono-and sesquiterpenes. These compounds are not only of pharmacological interest, as well as industrial. Composition of essencial oil can vary depending on the developmental stage, the plant part and other abiotic factors. However, genotypic variations also contribute to oil composition variation. Given the complexity of terpenes synthesis, including diversity of enzymes involved in these metabolic pathways, the purpose of this work was a L. alba leaf transcriptome characterization, in addition to identifying some enzymes probably involved in terpene synthesis. For that, it was made a transcriptome sequencing using 454 platform (Roche) followed by a de novo assembly. This platform, along with other NGS technologies, has been increasingly used for transcriptome sequencing in an approach known as RNA-Seq. Sequencing of a library prepared from total RNA in 1/8 plate generated 104,631 reads with average length of 184.48 bp and a total of 19,302,161 bases. Read assemblies were made using two different assemblers in order to compare them. While Newbler 2.5, proprietary software platform, assembled 2686 contigs with average length of 349bp, SeqMan2.2 generated 13,448 contigs with an average of 284bp. Then, functional annotation was performed with Blast2GO for all contigs from both assemblies; 51.49% and 30.88% of contigs, respectively, from Newbler and SeqMan were annotated. Finally, analysis of annotated sequences revealed some enzymes potentially involved in terpene synthesis. Results obtained from this pioneering study on the species show that NGS technology can be a very efficient tool for transcriptome sequencing and they will serve as reference for preparation of other more specific libraries. New sequencings should contribute to a better coverage of this transcriptome, allowing discovery of even rare transcripts.
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Alessandrini, Gaia. « Metodi innovativi per il sequenziamento di acidi nucleici ». Bachelor's thesis, Alma Mater Studiorum - Università di Bologna, 2014. http://amslaurea.unibo.it/7341/.
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Ralaivao, Rajaonimaria Hugues. « Commande des structures matricielles multiniveaux : application au convertisseur NPC ». Lille 1, 1999. https://pepite-depot.univ-lille.fr/LIBRE/Th_Num/1999/50376-1999-455.pdf.
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Le travail présenté dans ce rapport est une approche globale à la modélisation et à la commande des structures matricielles multiniveaux. A partir de la représentation matricielle, il est nécessaire d'établir le modèle de commande de la partie opérative en tenant compte de la nature des sources et de la structure N. P. C. Caractérisant le convertisseur. Des stratégies de commande pour un onduleur multiniveau monophasé et un onduleur multiniveau triphasé sont présentées. La représentation sous forme de graphe informationnel de causalité met en évidence la nature de chaque processeur élémentaire et leur interconnexion. L'inversion de ce graphe détermine l'architecture de l'axe de commande. Le deuxième chapitre traite de la commande d'un onduleur monophasé avec potentiel distribué fixe comprenant l'asservissement de la tension alternative. Il est à noter que le nombre de grandeurs de réglage devient supérieur au nombre de grandeurs à asservir, ce qui laisse place à de nombreux degrés de liberté pour la commande de cette structure. Dans le troisième chapitre, nous étudions le même onduleur relié à deux condensateurs mis en série. Ces derniers sont alimentés à partir d'une source unique de courant. Un double asservissement est alors effectué, l'asservissement de la tension alternative et l'autorégulation du potentiel distribué. Des résultats expérimentaux concernant ces deux structures sont présentés. Le quatrième chapitre présente une extension des deux commandes (commande pour la structure avec potentiel distribué fixe et pour la structure avec potentiel distribué autorégulé) à l'onduleur triphasé.
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Padmanabhan, Babu roshan. « Taxano-genomics, a strategy incorporating genomic data into the taxonomic description of human bacteria ». Thesis, Aix-Marseille, 2014. http://www.theses.fr/2014AIXM5056.
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Mon projet de doctorat était de créer un pipeline pour taxono-génomique pour la comparaison de plusieurs génomes bactériens. Deuxièmement, je automatisé le processus d'assemblage (NGS) et annotation à l'aide de divers logiciels open source ainsi que la création de scripts de maison pour le laboratoire. Enfin, nous avons intégré le pipeline dans la description de plusieurs espèces bactériennes de laboratoire sur. Cette thèse est divisée principalement en Taxono- génomique et Microbiogenomics. Les avis de la section taxono-génomique, décrit sur les avancées technologiques en génomique et métagénomique pertinentes dans le domaine de la microbiologie médicale et décrit la stratégie taxono-génomique en détail et comment la stratégie polyphasique avec des approches génomiques sont reformatage de la définition de la taxonomie bactérienne. Les articles décrivent les bactéries cliniquement importantes, leur séquençage complet du génome et les études génomiques comparatives, génomiques et taxono-génomique de ces bactéries. Dans cette thèse, j'ai inclus les articles décrivant ces organismes: Megasphaera massiliensis, Corynebacterium ihumii, Collinsella massiliensis, Clostridium dakarense. Bacillus dielmoensis, jeddahense, Occidentia Massiliensis, Necropsobacter rosorum et Pantoea septica. OceanobacillusMy PhD project was to create a pipeline for taxono-genomics for the comparison of multiple bacterial genomes. Secondly I automated the process of assembly (NGS) and annotation using various open source softwares as well as creating in house scripts for the lab. Finally we incorporated the pipeline in describing several bacterial species from out lab. This thesis is subdivided mainly into Taxono-genomics and Microbiogenomics. The reviews in taxono-genomics section, describes about the technological advances in genomics and metagenomics relevant to the field of medical microbiology and describes the strategy taxono-genomics in detail and how polyphasic strategy along with genomic approaches are reformatting the definition of bacterial taxonomy. The articles describes clinically important bacteria, their whole genome sequencing and the genomic, comparative genomic and taxono-genomic studies of these bacteria
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Monsinee, Attavanich. « A Study of Living Conditions in Post-Tsunami Houses : The Case of the Moklen Ethnic Minority in Phang Nga Province, Southern Thailand ». 京都大学 (Kyoto University), 2016. http://hdl.handle.net/2433/217215.
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Galler, Samuel. « Meeting in the middle : a multi-level analysis of Chinese HIV civil organisations ». Thesis, University of Oxford, 2017. https://ora.ox.ac.uk/objects/uuid:6bc52448-aa42-4549-b879-a58be57a2239.
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Civil organisations play a key intermediary role in the middle layer between high- level policies and individual-level outcomes in international development. By triangulating among seven Chinese HIV civil organisations with varying organisational models, I examine intermediary activity that illuminates the mechanisms by which civil organisations operate and extends theory about organisations and civil society. Development studies research can benefit from multi-level analyses of organisational processes, which provide insight into how civil organisations shape institutions and networks. My case studies show several new mechanisms that enable organisations to survive and operate in politically fraught conditions, and they offer insight into the complex interactions that allow civil organisations to operate in such contexts. First, HIV civil organisations manage associative stigma resultant from their core activities. I observe that market relationships can buffer against associative stigma transfer for organisations, with many leaders re-positioning their organisations relative to stigmatised individuals, recasting them as employees, customers, and users rather than constituents. Second, these groups use hybrid organising to better manage political risks and build partnerships through selective coupling of organisational components. Hybrid strategies can provide resilience to threats and improve resource management in institutionally plural environments. Third, HIV civil organisations engage in detached, informal, and interactive collaboration with state actors, enabling greater autonomy and innovation among civil actors and reducing risk for state actors. I trace interactions between these strategic activities at the levels of organisational activities, structures, and networks, finding that reproducing ambiguity can sustain new types of collaborations. These findings suggest a need to reconsider the role civil organisations play in society, calling attention to organisational processes that allow these actors agency in brokering flows of information and shaping formation of networks. By viewing civil organisations as intermediaries, new directions can be identified for development policy and practice.
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Darari, Mohamed. « Synthèse et caractérisation de nouveaux complexes Fe-NHC applicables en cellule solaire DSSC ». Electronic Thesis or Diss., Université de Lorraine, 2019. http://www.theses.fr/2019LORR0318.
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Ces travaux de thèse se situent dans un domaine au cœur des préoccupations actuelles qui est le développement de nouveaux complexes photoactifs utilisant des métaux abondants pour remplacer les métaux nobles dans les dispositifs à énergie renouvelable. De nouvelles familles de complexes précurseurs ou sensibilisateurs potentiels pour les cellules DSSC (Dye-sensitized solar cells) à base de fer et de ligands tridentates pyridyl-carbènes (FeNHC) ont été préparées et caractérisées. L’objectif, à côté de l’aspect applicatif pour l’énergie, est d’accroître les connaissances dans l’étude des relations structure-propriétés dans les complexes homoleptiques Fe-NHC portant des ligands pyridyl-bisimidazolylidènes par modification du noyau central, du groupe de greffage et de la géométrie de coordination. Après mise au point de la synthèse, les complexes ont fait l’objet de différentes caractérisations photophysiques, électrochimiques et théoriques. Un nouveau record de durée de vie des états excités MLCT a été obtenu avec des complexes à noyau pyrazine (32 ps). L’optimisation géométrique, c’est-à-dire le design de ligands permettant d’obtenir une géométrie de coordination octaédrique idéale pour induire un champ de ligand fort a été étudiée. Nous avons obtenu les complexes recherchés (structure attestée par diffraction RX) en accroissant la distance entre le cœur pyridine et les carbènes latéraux. Cette modification induit un décalage bathochrome, mais la conjugaison électronique ainsi que la rigidité du complexe restent à optimiser. Nous avons aussi développé une nouvelle voie de synthèse permettant d’introduire des groupes d’accroche Π-étendus dans le but de limiter la recombinaison de charge après injection dans le semi-conducteur TiO2. Enfin, Le rendement des cellules DSSC a été optimisé par l’incorporation d’un nouvel additif MgI2 dans la composition de l’électrolyte permettant d’atteindre une efficacité de 0.5% inédite pour un complexe de fer. Au final ces travaux de thèse mettent à la disposition de la communauté des outils synthétiques pour la conception de complexes FeII-NHC à durée de vie prolongée à l'état excité, et représentent une étape supplémentaire dans la compréhension des processus photophysiques opérés au sein de ces complexesThis thesis is part of a current concern and high interest research field, which is the development of new photoactive complexes using abundant metals to replace noble metals in renewable energy devices. Novel families of potential sensitizers for DSSC (Dye-sensitized solar cells) based on iron and tridentate pyridyl-carbene ligands (FeNHC) have been prepared and characterized. The aim, besides the application aspect for energy, is to increase the understanding of the structure-property relationships in Fe-NHC homoleptic complexes carrying pyridyl-bisimidazolylidene ligands by modification of the central core, anchoring group and coordination geometry. Once synthesized, the complexes were submitted to various photophysical, electrochemical and theoretical characterizations. A new MLCT excited state lifetime record was obtained with a pyrazine-based complexes (32 ps). The geometric optimization, which means the design of ligands to obtain an ideal octahedral coordination geometry to induce a strong ligand field was studied. X-ray diffraction measurements attested that the desired complexes were obtained by increasing the distance between the pyridine core and the lateral carbenes. This modification induces a bathochromic shift, but the electronic conjugation as well as the rigidity of the complexes remain to be optimized further. We have also developed a novel synthetic route for introducing Π-extended anchoring groups in order to limit the charge recombination after the injection into the TiO2 semiconductor. The efficiency of the DSSC cells was optimized by the incorporation of a new MgI2 additive in the electrolyte composition which led to an unprecedented efficiency of 0.5% for an iron complex. Finally, this thesis offers new synthetic tools for the design of FeII-NHC complexes with extended excited state lifetimes and represents a further step in the understanding of the photophysical processes operated within this type of iron complexes
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Ustuntepe, Bulent. « A Novel Two-parameter Modulation And Neutral Point Potential Control Method For The Three-level Neutral Point Clamped Inverter ». Master's thesis, METU, 2005. http://etd.lib.metu.edu.tr/upload/12606928/index.pdf.
Texte intégralRésumé :
In this thesis, the neutral point potential drift/fluctuation of the three-level neutral
point clamped inverter is analyzed and a novel control algorithm, the two-parameter
PWM method is proposed to confine the neutral point potential variation to a very
small range. The two-parameter PWM method provides superior neutral point
potential control performance even with small DC bus capacitors. The method is
based on PWM pulse pattern modification and requires no additional hardware.
Detailed analytical models of the neutral point current and potential as a function of
the modulation parameters are established and the neutral point potential behavior is
thoroughly investigated. Based on the study, the deficiency of the known methods is
illustrated and the two-parameter PWM method is developed and its superior
performance demonstrated. The performance of the two-parameter PWM method is
verified by means of computer simulations utilizing both the per-PWM-cycle
average model and the detailed model of the inverter. The results are supported by
laboratory experiments involving both an R-L load and an induction motor drive.
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MARIANI, JACOPO. « AIR POLLUTION EXPOSURE IN PREGNANCY : NASAL MICROBIOTA AND EXTRACELLULAR VESICLE COMMUNICATION AS POTENTIAL MECHANISM TO EXPLAIN ADVERSE BIRTH OUTCOMES ». Doctoral thesis, Università degli Studi di Milano, 2021. http://hdl.handle.net/2434/813004.
Texte intégralRésumé :
ABSTRACT
BACKGROUND: Particulate matter (PM) exposure has been linked to the exacerbation of respiratory and cardiovascular conditions as well as to adverse effects on fetal growth. To link the cross-talk that might occur between respiratory system and placenta after PM exposure, it has been proposed a novel mechanism of cell to cell communication mediated by extracellular vesicles (EVs). EVs are involved in both biological and pathological processes including pregnancy state. As PM interacts firstly with the nares, bacterial nasal microbiota (bNM) is one of the first compartments hit by PM exposure. This interaction might lead to structural and functional modifications within the bNM, which could cause variations within the EVs signaling network, which might lead to an improper immune response to PM stimuli.
AIM: The main aim of the project was to identify how PM exposure might modify the homeostasis and composition of whole EV signaling network and bNM and the leading to a possible impact on newborn development.
Subject recruitment: 518 volunteer pregnant women were enrolled during the 11th week of pregnancy at the ‘Clinica Mangiagalli’-Fondazione IRCCS Ca’ Granda – Ospedale Maggiore Policlinico, Milan, Italy. Among them, a group of subjects composed by 65 pregnant women, who agreed to participate to a more complex study protocol, was also identified.
Exposure assessment, EV and Microbiota measurement:
Exposure to PM concentrations was assessed using data obtained from FARM models for the whole population. In addition, individual exposure to short-term PM levels was retrieved through a personal sampler worn by the subgroup of 65 pregnant women. Plasmatic concentration and cellular origin of EVs were characterized by Nanoparticle tracking analysis (NTA) and flow cytometry, respectively. We investigated the bNM structure and characteristics of 65 pregnant women both at the enrolment (T0) and the following Monday during the cardiovascular screening (T1) through metabarcoding analysis of the V3–V4 regions of the 16s rRNA gene.
Statistical analysis:
Multivariable linear regression models were applied to test the associations between PM exposure (retrieved from both FARM models and personal sampler) and the majority of the collected outcomes such as maternal, foetal/newborns, and cardiovascular parameters as well as for bNM data.
On the other hand, to evaluate possible associations between PM concentrations and EV characteristics negative binomial regression models for count data with over-dispersion were performed.
In addition, multiple comparison method based on Benjamini-Hochberg False Discovery Rate (FDR) were applied for high number of comparisons.
RESULTS
In the whole population, PM10 exposure (measured at different time windows) resulted in decreased release of total amount of EVs, with the strongest effect related to concentration measured 13 weeks before the enrolment (13wks), whereas an inverse tendency was observed for exposure to PM2.5, although these associations were not significant. More reliable data on the finest fractions (PM1, PM2.5 and PM4) are given by personal sampler worn by a subgroup of women for a very short time period preceding the blood drawing (1.5 hours). As we considered this extremely acute effect, we observed a generalized increment in the EV count. Noteworthy, among the different analyzed EV subtypes, the levels of HERV-w+ EVs were the only to be increased by each tested PM10 time-lag. The same models applied on bNM data showed a reduction in terms of diversity (Shannon/Faith_pd ratio) and relative abundance of the genera Corynebacterium spp. and Staphylococcus spp. In addition, when the possible role of bNM as effect modifier between PM exposure and EVs release was investigated, we observed for the pregnant women with a balanced bNM an increment in terms of circulating EVs after daily PM stimuli.
Moreover, increments of the heart rate values were observed after exposure to both PM10 and PM2.5 levels measured the day before the cardiovascular screening (Day -1).
Focusing on newborn’s outcomes, decrements of the gestational age at birth were associated to PM concentrations measured throughout the gestation or during the 2nd trimester.
CONCLUSIONS: To our knowledge, this is the first exploring the role of bNM and the EV cross-talk in determining the effects of PM exposure levels on healthy pregnancies as well as on newborn outcomes. The results obtained so far might suggest a possible role exerted by both EV concentration and the bNM in pregnant women in mediating the effects of PM exposure.
Livres sur le sujet "Ngc 454"
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Xoxi, Koli. Martin Luteri dhe disa nga Rilindasit tane : Me rastin e 450-vjetorit të vdekjes së Reformatorit të madh gjerman. Tiranë : Shtëpia Botuese "ALTA", 1996.
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Heesch, J. van. De muntcirculatie tijdens de Romeinse tijd in het noordwesten van Gallia Belgica : De Civitates van de Nerviërs en de Menapiërs (ca. 50 v.C.-450 n.C.). Brussel : Koninklijke Musea voor Kunst en Geschiedenis, 1998.
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Hatherley, Candy, et Ross Murray. Culduthel. Society if Antiquaries of Scotland, 2021. http://dx.doi.org/10.9750/9781908332202.
Texte intégralRésumé :
The Iron Age settlement at Culduthel (NGR: NH 664 414) is one of the most significant later prehistoric sites identified in mainland Scotland. Archaeological excavation in 2005 revealed a craftworking centre which had specialised in the production of iron, bronze and glass objects between the late 1st Millennium BC and early 1st Millennium AD. This volume combines illustrated catalogues of finds with expert analyses to offer a unique insight into manufacture, trade and exchange of an Iron Age community in north-east Scotland.
Chapitres de livres sur le sujet "Ngc 454"
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Bettoni, Daniela, et Giuseppe Galletta. « NGC 4546, the Double-Spin SB0 ». Dans The World of Galaxies, 341–43. New York, NY : Springer US, 1989. http://dx.doi.org/10.1007/978-1-4613-9356-6_48.
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Dettmar, Ralf-Jürgen. « A Study of the Sombrero Galaxy (NGC 4594) ». Dans The World of Galaxies, 276–78. New York, NY : Springer US, 1989. http://dx.doi.org/10.1007/978-1-4613-9356-6_39.
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Gosset, E., J. Surdej et J. P. Swings. « Ultraviolet Excess Quasar Candidates in Large Fields : A Status Report Concerning the NGC 450 Area ». Dans Quasars, 45–46. Dordrecht : Springer Netherlands, 1986. http://dx.doi.org/10.1007/978-94-009-4716-0_5.
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Di Giulio, Camillo, S. Zara, A. Cataldi, Andrea Porzionato, Mieczyslaw Pokorski et Raffaele De Caro. « Human Carotid Body HIF and NGB Expression During Human Development and Aging ». Dans Advances in Experimental Medicine and Biology, 265–71. Dordrecht : Springer Netherlands, 2012. http://dx.doi.org/10.1007/978-94-007-4584-1_36.
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Rodrigues, Neshwin, Raghav Pachouri, Shubham Thakare, G. Renjith et Thomas Spencer. « Integrating Wind and Solar in the Indian Power System ». Dans Energiepolitik und Klimaschutz. Energy Policy and Climate Protection, 139–62. Wiesbaden : Springer Fachmedien Wiesbaden, 2022. http://dx.doi.org/10.1007/978-3-658-38215-5_7.
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AbstractIndia’s coal contribution to the total electricity generation mix stood at 73% in 2018. To meet India’s NDC ambitions, the federal government announced determined targets to integrate 450 GW Renewable Energy in the grid by 2030. This paper explores the pathways to integrate high RE generation by 2030 with effective balancing of supply and demand and associated challenges of flexibility requirements. A Unit commitment and economic dispatch model, which simulates the power system operation was used. The overall share of variable renewables reaches 26% and 32% in the Baseline Capacity Scenario (BCS) and High Renewable Energy Scenario (HRES) respectively. Improved ramp rates and a minimum thermal loading limit induce flexibility in the thermal fleet. In the HRES, more than 16 GW of coal plants are required for two-shift operations in April and more than 50% of days see an aggregate all-India ramp from the coal fleet in excess of 500 MW per minute. Battery Storage provides daily balancing while reducing VRE curtailment to less than 0.2% in the HRES. Nationally Coordinated dispatch shows increased power transfer from high VRE regions to export power during high VRE generation periods. It is thus found that high RE penetration is possible by 2030 at no extra system costs.
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Gammoudi, Sana, Neila Annabi-Trabelsi, Mariem Bidhi, Nouha Diwani, Amira Rekik, Hajer Khmekhem, Habib Ayadi, Wassim Guermazi et Jannet Elloumi. « The Solar Saltern of Sfax : Diversity of Hyperhalophilic Microalgae Species as a Promising Naturel Source of Biomolecules ». Dans Microalgae [Working Title]. IntechOpen, 2022. http://dx.doi.org/10.5772/intechopen.104712.
Texte intégralRésumé :
The saltern of Sfax is a thalasso haline paralic ecosystem were the salinity ranged from 45 to 450 PSU. The microalgae distribution of saltern showed a spatial ecological succession. The specific richness of microalgae decreased with the salinity, accounting 37, 17 and 5 species at three level of salinity from 40 to 80, 80 to 200 and 200 to 450 PSU, respectively. To better understand the behavior of the hyper-halo tolerant microalgae, three autotrophic species Halamphora sp. SB1 MK575516 (Diatom), Phormidium versicolor NCC-466 (Cyanophyceae) and Dunaliella salina (Chlorophyceae) were isolated from each level of salinity and they are grown in batch in artificial seawater at laboratory scale. Growth and metabolites synthesized by these microalgae were assessed. Salinity reacts on the physiology of these three species which possess mechanisms of resistance to more or less effective stresses and generally by the synthesis of different biomolecules such as pigments, sugars, proteins and fatty acids.
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Barbosa, Maíra C., José Luiz de Medeiros, Ofélia Q. F. Araújo et Giovani Cavalcanti Nunes. « NGL Recovery from CO2-EOR Streams ». Dans Computer Aided Chemical Engineering, 590–94. Elsevier, 2012. http://dx.doi.org/10.1016/b978-0-444-59507-2.50110-4.
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Cavaiuolo, Mario, Andre J. S. Yakovleff et Charles R. Watson. « NAC : A Building Block for Neural Architectures ». Dans Artificial Neural Networks, 1461–64. Elsevier, 1992. http://dx.doi.org/10.1016/b978-0-444-89488-5.50136-6.
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Duggan, Evan W., et Cherian S. Thachenkary. « Supporting the JAD Facilitator with the Nominal Group Technique ». Dans Advances in End User Computing, 151–73. IGI Global, 2005. http://dx.doi.org/10.4018/978-1-59140-474-3.ch008.
Texte intégralRésumé :
Joint Application Development (JAD) was introduced in the late 1970s to solve many of the problems system users experienced with the conventional methods used in systems requirements determination (SRD) and has produced noteworthy improvements over these methods. However, a JAD session is conducted with freely interacting groups, which makes it susceptible to the problems that have curtailed the effectiveness of groups. JAD outcomes are also critically dependent on excellent facilitation for minimizing dysfunctional group behaviors. Many JAD efforts are not contemplated (and some fail) because such a person is often unavailable. The nominal group technique (NGT) was designed to reduce the impact of negative group dynamics. An integration of JAD and NGT is proposed here as a crutch to reduce the burden of the JAD facilitator in controlling group sessions during SRD. This approach, which was tested empirically in a laboratory experiment, appeared to outperform JAD alone in the areas tested and seemed to contribute to excellent group outcomes even without excellent facilitation.
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Solanki, Sunil P., et Ibrahim Al-Hassan. « NGL Recovery Processes and Operating Issue-Case Study ». Dans Proceedings of the 4th International Gas Processing Symposium, 185–95. Elsevier, 2015. http://dx.doi.org/10.1016/b978-0-444-63461-0.50019-5.
Texte intégralActes de conférences sur le sujet "Ngc 454"
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Wang, Zhong, Stephanie Bush, Doug McElroy, Robert Minchin, Robert Minchin et Emmanuel Momjian. « Infrared and Ultraviolet Observations of VIRGOHI 21 and NGC 4254's Outer Disk ». Dans THE EVOLUTION OF GALAXIES THROUGH THE NEUTRAL HYDROGEN WINDOW. AIP, 2008. http://dx.doi.org/10.1063/1.2973583.
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Coelho, Isabella Nascentes Tanizaki, Geovanna Calazans Corrêa et Isabella Paolilo Calazans. « Lesão intraepitelial de alto grau : fatores prognósticos para recorrência e recidiva após tratamento ». Dans 45º Congresso da SGORJ XXIV Trocando Ideias. Zeppelini Editorial e Comunicação, 2021. http://dx.doi.org/10.5327/jbg-0368-1416-20211311050.
Texte intégralRésumé :
Introdução: O câncer de colo uterino, apesar de apresentar um prognóstico satisfatório quando diagnosticado e tratado precocemente, ainda demonstra altas taxas de mortalidade no mundo. Os procedimentos excisionais são as principais condutas realizadas diante de lesões intraepiteliais de alto grau (LIEAG). Não obstante, a recorrência e recidiva da neoplasia ocorrem em 5 a 35% das mulheres submetidas a esse tratamento. Diante disso, é fulcral avaliar os fatores de risco determinantes da recorrência e recidiva. Objetivo: Analisar os fatores de risco relacionados à persistência de LIEAG após tratamento excisional. Métodos: Foi realizada uma revisão de literatura, com busca no PubMed. Utilizaram-se os descritores associados “HPV”, “HSIL”, “risk factors” AND “persistent” e foram encontrados 77 artigos dos anos de 2009 a 2019. Como critérios de inclusão, adotaram-se publicações na íntegra e nos idiomas inglês e português. Por fim, foram selecionados os estudos que descreviam os fatores para a recorrência da LIEAG e foram utilizados 12 artigos para a revisão. Resultados e conclusão: As lesões cervicais representam uma das manifestações subclínicas da infecção pelo papilomavírus humano (HPV) que apresenta características proliferativas com maturação anormal e achados atípicos de graus variáveis. A terminologia atual de classificação citológica cervical é baseada no sistema de Bethesda, que classifica as neoplasias intraepiteliais cervicais de grau I (NIC I) em lesões intraepiteliais escamosas de baixo grau (LIEBG) e as neoplasias de graus II (NIC II) e III (NIC III) em LIEAG. A LIEAG é caracterizada por núcleos irregulares e hipercromáticos, aumento da relação núcleo-citoplasma e presença de cromatina grosseira. Em relação aos achados colposcópicos anormais, a NIC II é restrita aos dois terços inferiores do epitélio, enquanto a NIC III se encontra em toda a espessura do epitélio. Uma revisão sistemática realizada entre 2000 e 2019 avaliou o valor do teste de HPV alto risco (HPVAR) para screening e seguimento pós-tratamento, e os resultados mostraram que após excisão cirúrgica o teste de HPVAR negativo está associado a risco menor que 2% de recorrência (valor preditivo negativo de 98%) e, se positivo, de 12 a 25% de recidiva. Em um estudo prospectivo observacional realizado com 307 mulheres, entre os riscos analisados, fatores como HIV positivo, margens comprometidas e tabagismo apresentaram risco aumentado, porém apenas em casos de margens comprometidas houve significância estatística. Em um estudo retrospectivo realizado entre 2011 e 2015, 3.582 pacientes foram acompanhadas e os riscos mostraram-se elevados para pacientes maiores de 50 anos, com presença de margens positivas, particularmente endocervicais, além de citologia alterada e teste DNA-HPV positivo. Com isso, mesmo após tratamento, a LIEAG ainda apresenta riscos de recorrência, o que demonstra a importância do acompanhamento subsequente e do diagnóstico precoce.
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Ellingson, W. A., S. A. Rothermel et J. F. Simpson. « Nondestructive Characterization of Ceramic Composites Used as Combustor Liners in Advanced Gas Turbines ». Dans ASME 1995 International Gas Turbine and Aeroengine Congress and Exposition. American Society of Mechanical Engineers, 1995. http://dx.doi.org/10.1115/95-gt-404.
Texte intégralRésumé :
Nondestructive characterization (NDC) methods which can provide full field information about components prior to and during use are critical to the reliable application of continuous fiber ceramic matrix composites in high firing temperature (>1350°C) gas turbines. For combustor liner applications, although nonmechanical load bearing components, thermal characteristics as well as mechanical integrity is vitally important. NDC methods being developed to provide necessary information include x-ray computed tomography (mainly for through-wall density and delamination detection), infrared-based thermal diffusivity imaging, and single-wall through-transmission x-ray imaging (mainly for fiber content and alignment detection). Correlation of the data obtained from NDC methods with subscale combustor liner tests have shown positive results at thermal cycling temperatures from 700°C to 1177°C.
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Bastos, Alberto Freaza Lobão, Amanda Mendes Soares, Nicole Souto Campanario, Amanda Salgueiro Mello, Christiani Ribeiro Pereira et Yara Lúcia Mendes Furtado de Melo. « Concordância cito-colpo-histológica em uma coorte com preventivo alterado ». Dans 44° Congresso da SGORJ - XXIII Trocando Ideias. Zeppelini Editorial e Comunicação, 2020. http://dx.doi.org/10.5327/jbg-0368-1416-2020130204.
Texte intégralRésumé :
Introdução: A citologia é o método recomendado pelas Diretrizes Brasileiras para Rastreamento do Câncer do Colo Uterino. Além disso, essas diretrizes fazem recomendações quanto à conduta frente as citologias alteradas. O “ver e tratar” é uma das recomendações quando a citologia é de lesão intraepitelial escamosa de alto grau (HSIL) e a colposcopia é concordante. Objetivo: Verificar a concordância cito-colpo-histológica em mulheres submetidas à excisão tipo 1, a margem cirúrgica e os resultados do “ver e tratar” em um ambulatório de patologia cervical em hospital universitário no Rio de Janeiro. Métodos: Estudo de corte transversal no qual foram selecionadas mulheres encaminhadas para o Instituto de Ginecologia da Universidade Federal do Rio de Janeiro (IG-UFRJ) para colposcopia após citologia de rastreio alterada. Verificou-se concordância cito-colposcópica e cito-colpo-histológica. A concordância cito-colposcópica foi observada quando o laudo citológico foi de ASC-H (células atípicas de significado indeterminado, não podendo excluir lesão de alto grau), HSIL e HSIL/invasão, e a colposcopia sugeria HSIL ou HSIL/invasão. A concordância cito-colpo-histológica foi observada quando também houve concordância com o laudo histológico. Avaliou-se o comprometimento das margens cirúrgicas da excisão tipo 1 e se foi realizada a estratégia “ver e tratar”. Resultados: Neste estudo, foram selecionadas 33 mulheres com média de idade de 32,6 anos. Na citologia de encaminhamento, 21 delas (63,6%) tinham laudo de HSIL; dez (30,3%), ASC-H; e duas (6,1%), lesão intraepitelial escamosa de baixo grau (LSIL). Na colposcopia, em 31 mulheres (93,9%) foram observados achados maiores, sugerindo HSIL, e em duas (6,1%), achados menores, sugerindo LSIL. Os laudos histopatológicos apontaram três pacientes (1%) com carcinoma escamoso microinvasor, 19 (57,6%) com neoplasia intraepitelial cervical grau 3 (NIC 3), 10 (30,3%) com NIC 2 e uma (3,0%) com NIC 1. As margens estavam comprometidas em 15 mulheres (45,5%) e livres em 17 (51,5%), e uma delas (3,0%) estava sem status das margens. Houve concordância cito-colposcópica de HSIL em 84,8% dos casos (28/33), e observou-se discordância em 18,2% do total de mulheres (5/33), sendo três citologias LSIL com colposcopia HSIL; uma citologia ASC-H; e uma HSIL com colposcopia LSIL. Houve concordância cito-colpo-histológica em 81,8% dos casos (27/33), e nos 18,2% (6/33) discordantes, os resultados foram: quatro casos de NIC 3 (uma citologia ASC-H com colposcopia LSIL e três citologias LSIL com colposcopia HSIL); um caso de NIC 2 (citologia HSIL com colposcopia LSIL); e um caso de NIC 1 com análise cito-colposcópica HSIL. A estratégia “ver e tratar” foi realizada em 22 mulheres (66,7%), das quais apenas uma (3%) apresentou resultado NIC 1, 15 (68,18%) apresentaram NIC 3/Microinvasor e seis (27,27%), NIC 2. Conclusão: Neste estudo, observou-se alta concordância cito-colposcópica e cito-colpo-histológica. Na aplicação do “ver e tratar”, houve pouca frequência de sobretratamento e, na maioria dos casos, as margens cirúrgicas estavam livres. Esses resultados são relevantes por mostrar o quanto é importante o treinamento em serviço de colposcopia e a resolução com “ver e tratar”.
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Moss, Roger W., Roger W. Ainsworth, Colin D. Sheldrake et Robert Miller. « The Unsteady Pressure Field Over a Turbine Blade Surface : Visualisation and Interpretation of Experimental Data ». Dans ASME 1997 International Gas Turbine and Aeroengine Congress and Exhibition. American Society of Mechanical Engineers, 1997. http://dx.doi.org/10.1115/97-gt-474.
Texte intégralRésumé :
The unsteady static pressure field over a turbine rotor has been measured in the Oxford Rotor Facility using 78 flush-mounted miniature pressure transducers. This extensive surface coverage allows ensemble-averaged data to be displayed as an animated image. At the mid-height plane the fluctuations are well predicted using the UNSFLO 2-D unsteady code: away from mid-height the data shows large fluctuations. 12 transducers mounted on the blade leading edge show the relative total pressure field entering the blade row; these plus area traverse measurements at rotor exit are used to interpret the surface flow features. Rotor-mounted hot wires show large variations in blade incidence during the wake-passing cycle and allow conversion of blade-relative data into the absolute frame. Large pressure fluctuations in the root region may be explained in terms of a loss core associated with the NGV wake.
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Chen, Kuo-Huey, et Nan-Suey Liu. « Navier-Stokes solution of the FLUX code - A module for the NCC solver using the concept of space-time conservation element and solution element ». Dans 38th Aerospace Sciences Meeting and Exhibit. Reston, Virigina : American Institute of Aeronautics and Astronautics, 2000. http://dx.doi.org/10.2514/6.2000-455.
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Nims, Robert. « Development of an Oilless, Gearless, and Bleedable Under Armor Auxiliary Power Unit ». Dans ASME 1995 International Gas Turbine and Aeroengine Congress and Exposition. American Society of Mechanical Engineers, 1995. http://dx.doi.org/10.1115/95-gt-444.
Texte intégralRésumé :
The oilless, gearless and bleedable under armor auxiliary power unit (UAAPU) development program is providing the United States Army with a technically advanced auxiliary power unit (APU) for military tracked vehicles. Fully functional prototypes in two configurations are being demonstrated in both laboratory and field tests. The APU power output is 32 kw (43 shp) with 10 to 20 kw supplied as electrical power and the balance of power delivered as elevated pressure bleed air for use in conjunction with the vehicle nuclear, biological, and chemical (NBC) filtration and environmental control system (ECS). The design of the UAAPU incorporates air bearings and a shaft-speed permanent-magnet starter/generator with electronic power conditioning to eliminate completely the need for oil lubrication and an auxiliary gearbox. This significantly simplifies the mechanical design of the APU with resulting reliability, durability, and maintainability improvements. Over 600 hours of laboratory system development test time has been logged and 90 hours in field tests on an M1A1 main battle tank. Operations in the field have included both gunnery and simulated warfare training exercises.
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Borges, Victória Maria Luz, Marília Francisca da Silva Pereira, Isadora Maria de Carvalho Marques, Flávio Luis dos Santos Sousa, Lia Cruz Vaz da Costa Damásio et Marcelo Barbosa Ribeiro. « Metástase óssea em câncer de colo uterino : um relato de caso ». Dans 45º Congresso da SGORJ XXIV Trocando Ideias. Zeppelini Editorial e Comunicação, 2021. http://dx.doi.org/10.5327/jbg-0368-1416-20211311055.
Texte intégralRésumé :
Introdução: O câncer de colo de útero é o terceiro câncer mais comum e a quarta causa de morte relacionada a câncer no mundo. Ocorre, na maior parte dos casos, entre a terceira e a quinta décadas de vida e o principal fator de risco relacionado é a presença do papilomavírus humano, com seus subtipos oncogênicos. Metástase óssea raramente ocorre em câncer de colo de útero, com a incidência de 0,8 a 2,3%, e alguns fatores de risco estão associados ao seu desenvolvimento, entre os quais: idade avançada, maiores estágios T e N, tipos histológicos não adenocarcinoma e não escamoso, tumores pouco diferenciados e presença de outras metástases (pulmões, fígado e cérebro). Relato de caso: Paciente de 54 anos, menarca aos 18 e sexarca aos 20. Procurou o atendimento no ambulatório de ginecologia em 2017, relatando queixa de dor em baixo ventre. Ao exame especular, visualizou-se moderada ectopia e colo sangrante. O exame colpocitológico revelou lesão intraepitelial de alto grau. A paciente foi encaminhada à colposcopia, que mostrou NIC III, e foi submetida a tratamento cirúrgico e radioterapia posterior. O exame histopatológico evidenciou carcinoma escamoso GIII, com invasão de 100% da margem comprometida. A paciente evolui com dor em região lombar e em membros inferiores após três anos de seguimento clínico, com presença de lesão lítica em L4 e lesão com aspecto de hemangiomastose no corpo vertebral de L3 à radiografia. A ressonância magnética e a cintilografia óssea exibiram lesão lítica comprometendo o corpo cervical de L4 à direita, o que não foi observado em exames anteriores. Realizou-se biópsia e foi confirmada a neoplasia metastática. Conclusão: A neoplasia de colo uterino surge entre a terceira e a quinta décadas de vida, sendo o tipo histológico carcinoma escamoso o mais comum e condizente com o caso descrito. Apesar de rara, a metástase óssea ocorre em média dois anos após o diagnóstico, sendo o principal sítio a coluna vertebral (36,36%) e destacando-se a topografia lombar (51,9%). Em contrapartida, uma metanálise publicada em 2019 evidenciou que, entre os casos de câncer de colo uterino em estágio avançado, a metástase óssea ocorreu em 23%, perdendo apenas para a metástase pulmonar (59%). Embora não sejam elucidados os mecanismos de metástase, sugere-se relação com o comportamento do tumor primário, o suprimento vascular, o sistema imune e o ambiente ósseo. São necessários maiores estudos para elucidar a oncogênese da metástase óssea. O prognóstico de pacientes com metástases ósseas é bem restrito entre seis e 12 meses, sendo proposto um tratamento paliativo com abordagem multiprofissional, visando aliviar o quadro álgico de elevada intensidade, evitar fraturas patológicas e prevenir incapacidades. O principal objetivo é ter melhor qualidade de vida. O grande avanço preconizado pela Federação Internacional de Ginecologia e Obstetrícia e Federação Brasileira das Sociedades de Ginecologia e Obstetrícia é o rastreamento universal e o diagnóstico precoce de lesões precursoras do câncer de colo uterino, sobretudo por tratar-se de um método de baixo custo e de fácil reprodução.
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Ventura, Patrícia Mendonça, Daniela da Silva Alves Monteiro, Bruna Obeica, Susana Cristina Aidé Viviani Fialho, Isabel Cristina Chulvis Do Val Guimarães et Caroline Oliveira. « Câncer cervical em paciente jovem ». Dans 44° Congresso da SGORJ - XXIII Trocando Ideias. Zeppelini Editorial e Comunicação, 2020. http://dx.doi.org/10.5327/jbg-0368-1416-2020130226.
Texte intégralRésumé :
Introdução: A infecção genital persistente pelo HPV (sigla em inglês para Papilomavírus Humano) é a principal causa para o desenvolvimento das lesões precursoras e do câncer de colo uterino. Estudos mostram que a infecção pelo HPV está presente em mais de 99,7% de todos os carcinomas cervicais. Nesses casos, o tempo médio entre a infecção e a manifestação inicial do câncer cervical é estimado entre 10 e 15 anos. No Brasil, o Ministério da Saúde preconiza que o rastreamento do câncer de colo seja realizado dos 25 aos 64 anos nas mulheres com vida sexual ativa. O rastreamento em mulheres com menos de 25 anos não tem impacto na redução da incidência ou mortalidade por câncer do colo do útero. Apesar de raro, o câncer em paciente jovem pode ocorrer. Estudos estimam que mais de 50% da população feminina com vida sexual ativa irá entrar em contato com o vírus em algum momento de suas vidas. Dessas mulheres, cerca de 80% terão apenas uma infecção transitória. Objetivo: Relatar caso de câncer cervical em paciente jovem. Material e Métodos: S.P.S., 25 anos, sem comorbidades. Sexarca aos 15 anos, G1P1 (parto vaginal há oito anos). Procurou atendimento no Ambulatório de Patologia Cervical em razão de um sangramento transvaginal de volume e frequência aumentados há cinco meses associado à sinusiorragia. Primeiro e único colpocitológico com resultado normal aos 20 anos. Ao exame especular, foi visualizada lesão vegetante, friável ocupando todo o colo uterino com odor necrótico. Resultados: O resultado do exame histopatológico foi de carcinoma de células escamosas pouco diferenciado com intensa necrose tumoral. Sorologias para HIV (sigla em inglês para vírus da imunodeficiência humana), sífilis, hepatite B e C negativas. Conclusão: A infecção pelo HPV é frequente na população feminina e a persistência dos subtipos oncogênicos tem papel fundamental no desenvolvimento do câncer de colo do útero, que é a quarta causa de morte na mulher. Segundo o Ministério da Saúde, o rastreamento em mulheres abaixo de 25 anos tem baixa eficiência, pois há evidências de que o câncer do colo do útero diagnosticado em mulheres muito jovens é mais agressivo e inclui tipos histológicos mais raros do que no grupo etário 25‒29 anos. Além disso, o diagnóstico de lesão intraepitelial escamosa de alto grau corresponderia mais frequentemente à neoplasia intraepitelial cervical grau II (NIC II) do que à neoplasia intraepitelial cervical grau III (NIC III), tendendo à regressão espontânea por ter comportamento semelhante à lesão de baixo grau em mulheres com menos de 25 anos. É preciso ainda considerar que o tratamento de lesões precursoras do câncer de colo do útero nessas pacientes está associado ao aumento de morbidade obstétrica e neonatal, por exemplo, o parto prematuro. No entanto, casos de câncer de colo do útero podem ocorrer em mulheres jovens, e o ginecologista deve estar apto para dar o suporte necessário à paciente.
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Athayde, Natália Merten, et Alzira Alves de Siqueira Carvalho. « The heart of myofibrillary myopathy ». Dans XIII Congresso Paulista de Neurologia. Zeppelini Editorial e Comunicação, 2021. http://dx.doi.org/10.5327/1516-3180.457.
Texte intégralRésumé :
Context: Myofibrillar myopathies (MFM) represent a heterogeneous group of disorders of skeletal and cardiac muscle caused by mutations in genes that encode proteins of sarcomere. Diagnosis is a challenge due to clinical and genetic variability. Case report: Woman, 36 years old, presenting stumbles and falls for 3 years evolving with proximal limb weakness. At age 30, she fainted and a cardiac pacemaker was implanted. Non-consanguineous parents. Neurological exam: proximal and distal weakness in lower limbs and distal atrophy; osteotendinous reflexes normal. Bilateral scapula alata. Exams: CPK = 457 U / l; EMG: myopathic pattern. Muscle MRI: diffuse and heterogeneous fatty degeneration, marked in sartorius, gracilis and semitedinous. Panel NGS myopathies: pathogenic variant, c.1175T> C, missense in heterozygosis in desmin gene. CONCLUSION: The diagnosis of MFM is based on the morphological findings of muscle biopsy with the presence of protein aggregates as a determining factor. Currently, genetic testing by NGS has facilitated early diagnosis allowing for a more appropriate clinical approach. The desmin gene was the first one described to be associated with this group of myopathies. It encodes the desmin protein, a member of the intermediate filament family present in cardiac and skeletal muscle. Several phenotypes are related to desmin gene: isolated dilated cardiomyopathy; scapuloperoneal weakness and distoproximal weakness with cardiac alterations. Desminopathy is a rare cause of cardiomyopathy and / or myopathy. The diagnosis should be thought in patient with muscle weakness and cardiac changes.
Rapports d'organisations sur le sujet "Ngc 454"
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de Kemp, E. A. Canada in 3D - National Geological Surveys Committee update report. Natural Resources Canada/CMSS/Information Management, 2023. http://dx.doi.org/10.4095/331340.
Texte intégralRésumé :
The Canada in 3D (C3D) project (https://canada3d.geosciences.ca/), formally initiated in the spring of 2020 by the National Geological Surveys Committee (NGSC) is required to provide a working group update to all its provincial and territorial partners. There have been several informal C3D working meetings with the partners prior to the creation of the C3D Charter and there has been a hiatus in communication through the Covid-19 pandemic. To re-engage the C3D community, a video tele-conference was held on June 6th, 2022 with approximately 44 participants. There was representation and presentations of all provinces and territories with various managers, technical and scientific observers. The purpose of this compilation of presentations and discussions from this 2022 C3D-NGSC reconnection meeting is to provide activity information to all participants, and their respective organizations, highlighting current geoscience compilation and modelling efforts in 2D and 3D. The aim is to help identify opportunities for collaboration on data standards, methods, applications and best practices but with the overall goal of working toward the C3D vision, outlined in the C3D charter of an updated 2D and 3D geological map/model of Canada.