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Littérature scientifique sur le sujet « Dati velocimetrici »

Auteur : Grafiati

Publié le 10 mars 2023

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Articles de revues sur le sujet "Dati velocimetrici"

Giuliano, N., M. L. Annunziata, S. Tagliaferri, F. G. Esposito, O. C. M. Imperato, M. Campanile, M. G. Signorini et A. Di Lieto. « IUGR Management : New Perspectives ». Journal of Pregnancy 2014 (2014) : 1–8. http://dx.doi.org/10.1155/2014/620976.

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Aim of the Study. Analyzing velocimetric (umbilical artery, UA; ductus venosus, DV; middle cerebral artery, MCA) and computerized cardiotocographic (cCTG) (fetal heart rate, FHR; short term variability, STV; approximate entropy, ApEn) parameters in intrauterine growth restriction, IUGR, in order to detect early signs of fetal compromise.Population Study. 375 pregnant women assisted from the 28th week of amenorrhea to delivery and monitored through cCTG and Doppler ultrasound investigation. The patients were divided into three groups according to the age of gestation at the time of delivery, before the 34th week, from 34th to 37th week, and after the 37th week. Data were analyzed in relation to the days before delivery and according to the physiology or pathology of velocimetry. Statistical analysis was performed through thet-test, chi-square test, and Pearson correlation test(P<0.05). Our results evidenced an earlier alteration of UA, DV, and MCA. The analysis between cCTG and velocimetric parameters (the last distinguished into physiological and pathological values) suggests a possible relation between cCTG alterations and Doppler ones. The present study emphasizes the need for an antenatal testing in IUGR fetuses using multiple surveillance modalities to enhance prediction of neonatal outcome.

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Bufalino, L., G. Rizzo, D. Rinaldo, E. Romanini, H. Valensise, D. Arduini et C. Romanini. « Previsione della Preeclampsia nella Gravidanza Gemellare Mediante Velocimetria Doppler Uterina ». Acta geneticae medicae et gemellologiae : twin research 43, n^o 1-2 (avril 1994) : 115. http://dx.doi.org/10.1017/s0001566000003056.

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AbstractL'incidenza di pre-eclampsia nella gravidanza gemellare è aumentata di circa 5 volte rispetto alle gravidanze singole. La velocimetria Doppler a livello uterino si è dimostrato in popolazioni a rischio, un metodo efficace per identificare precocemente le pazienti a rischio di pre-eclampsia. Non sono disponibili dati a questo riguardo nella gravidanza gemellare.Obiettivi: 1) valutare le differenze negli indici di resistenza delle arterie uterine tra gravidanze singole e gemellari, 2) valutare eventuali differenze in gravidanze gemellari complicate da pre-eclampsia, 3) valutare il valore predittivo della velocimetria Doppler uterina sulla pre-eclampsia in gravidanze gemellari esaminate a 20-24 settimane di gestazione e poi seguite prospettivamente.Disegno dello studio: l'indice di resistenza RI a livello di entrambe le arterie uterine è stato calcolato mediante Doppler colore-pulsato (Ansaldo Hitachi AU590A) nelle seguenti popolazioni: a) 315 gravidanze singole non complicate, b) 96 gravidanze gemellari non complicate, c) 53 gravidanze gemellari complicate da pre-eclampsia, d) 63 gravidanze gemellari valutate a 20-24 settimane di gestazione e non complicate al momento della osservazione.Risultati: 1) sia nelle gravidanze singole che in quelle gemellari i valori di RI decrescono nel corso della gravidanza e i valori presenti nelle gravidanze gemellari a decorso normale sono significativamente inferiori (Anova p < 0.001). 2) le gravidanze gemellari complicate da preeclampsia dimostrano valori di RI lievemente superiori alle gravidanze gemellari non complicate (p <0.05). 3) il valore predittivo sulla preeclampsia delle arterie uterine a 20-24 settimane è risultato inadeguato (k = 0.24).Conclusioni: la velocimetria Doppler delle arterie uterine è risultata di scarsa utilità clinica nel prevedere la preeclampsia nelle gravidanze gemellari.

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Colloi, D., et G. Savare. « Valore E Limiti Della Velocimetria Doppler Nella Diagnosi Di Torsione Di Funicolo Di Vecchia Data ». Urologia Journal 53, n^o 1 (février 1986) : 126–29. http://dx.doi.org/10.1177/039156038605300126.

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Oliveira, M. E. F., Y. Tarasevych, W. R. R. Vicente et P. M. Bartlewski. « 195 Are the Spectral Doppler Indices of the Ovarian Arteries Predictive of Ovulatory Responses and Embryo Yields in Superovulated Ewes ? » Reproduction, Fertility and Development 30, n^o 1 (2018) : 238. http://dx.doi.org/10.1071/rdv30n1ab195.

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Increased uterine and ovarian blood flow seems to be related to the effectiveness of ovarian response to hormonal superstimulation in mares (Witt et al. 2012 Theriogenology 77, 1406-1414). Similar studies do not exist for sheep. Nineteen Santa Inês ewes were subjected to a 9-day CIDR® priming and superovulatory (SOV) treatment with 200 mg of porcine (p)FSH per ewe given twice daily for 4 consecutive days in decreasing doses and initiated 6 days after CIDR® insertion. Ten ewes received an IM injection of oestradiol benzoate (EB, 350 μg) at the time of CIDR® insertion (group E); the remaining animals served as controls (group C). The ewes were placed in a pen with rams for 3 days after CIDR® removal. The embryos were recovered surgically 6 days after the CIDR® removal. Transrectal ultrasonographic examinations (Doppler mode) using MyLab VET 30 scanner (Esaote, Genoa, Italy) equipped with a linear-array (6- to 8-MHz) transducer were performed once a day throughout the SOV treatment (Days 1 to 4) to determine the velocimetric indices of the left and right ovarian arteries: flow velocity integral (FVI); peak systolic velocity (SVp); mean velocity (Vm); end-diastolic velocity (EDV); vascular resistance index [RI = (SVp – EDV)/SVp]; and pulsatility index [PI = (SVp – EDV)/Vm]. All spectral data were obtained from a longitudinal subovarian segment of the ovarian artery using a gate ranging from 2 to 3 mm (~two-thirds of the vessel’s diameter) and insonation angle ≤60°. There were no differences (P > 0.05) in ovarian responses and embryo yields/quality between left and right ovaries/uterine horns flashed or between EB-treated and control ewes. Mean EDV and Vm were greater (P < 0.05) in group C compared with group E on Days 1 and 2, and mean Vp was greater (P < 0.05) in group C ewes on Day 3 of the SOV treatment. In group E, there were 5 significant correlations between the spectral Doppler indices (RI, PI, and EDV) of the ovarian arteries recorded on Days 2 and 4 and SOV responses (numbers of degenerated embryos, unfertilized eggs, and luteinized unovulated follicles characterised by a lack of ovulatory stigmata). In group C, 7 significant correlations were found between Vp, EDV, Vm, and RI on Days 1, 2, and 3 and numbers/percentages of degenerated embryos, numbers of prematurely regressed luteal structures (pale, ≤5 mm in diameter), and embryo viability rates (percentage of transferrable quality embryos). When ultrasonographic and SOV data were analysed separately for the left and right ovarian artery/uterine horn, multiple significant correlations were found between the velocimetric indices and SOV responses but they varied among days, the 2 ovaries, and the 2 groups of animals studied. These results may be interpreted to suggest that intrinsic gonadal factors remain a significant barrier precluding the prediction of SOV outcomes from haemodynamic changes in ovine ovarian arteries. Velocimetric indices determined in the ovarian arteries appear to have limited prognostic value during the application of different SOV protocols in ewes.

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Isella, Luana, Stefano Podestà, Sonia Resemini, Marco Pasta et Claudio Eva. « The Relationship between Damage and Peak Accelerations in Ripabottoni during the 2002 Molise, Italy, Earthquake ». Earthquake Spectra 20, n^o 1_suppl (juillet 2004) : 119–30. http://dx.doi.org/10.1193/1.1766307.

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After the main shocks of the 2002 Molise, Italy, earthquake sequence, the University of Genoa Geophysical Section (Dip. Te. Ris) installed a temporary seismic network, composed of two velocimetric and two accelerometric stations, in the village of Ripabottoni (Campobasso Province), near the epicentral area. These stations were implemented in the regional network of seismic instruments installed after November 1 by geophysical institutes from Rome and Trieste, Italy. The network registered more than 2,000 aftershocks with magnitudes ranging from 1.0–4.0. A DISEG Group also participated in a survey coordinated by the Larino Emergency Operations Center to examine damaged churches. The preliminary data, which correlates the waveform of the available recordings from aftershocks with damaged masonry pillars, indicates that the damage may relate not only to the intrinsic vulnerability of this building type, but also to the high energy in the high frequency range observed in the vertical component of the earthquakes.

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Worku, Keduse, Songhu Wang, Jennifer Burt, Malena Rice, Xian-Yu Wang, Yong-Hao Wang, Steven S. Vogt et al. « Revisiting the Full Sets of Orbital Parameters for the XO-3 System : No Evidence for Temporal Variation of the Spin–Orbit Angle ». Astronomical Journal 163, n^o 4 (10 mars 2022) : 158. http://dx.doi.org/10.3847/1538-3881/ac4e1a.

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Abstract We present 12 new transit light curves and 16 new out-of-transit radial-velocity measurements for the XO-3 system. By modeling our newly collected measurements together with archival photometric and Doppler velocimetric data, we confirmed the unusual configuration of the XO-3 system, which contains a massive planet ( M P = 11.92 − 0.63 + 0.59 M J ) on a relatively eccentric ( e = 0.2853 − 0.0026 + 0.0027 ) and short-period (3.19152 ± 0.00145 day) orbit around a massive star ( M * = 1.219 − 0.095 + 0.090 M ⊙ ). Furthermore, we find no strong evidence for a temporal change of either V sin i * (and by extension, the stellar spin vector of XO-3), or the transit profile (and thus orbital angular momentum vector of XO-3b). We conclude that the discrepancy in previous Rossiter–McLaughlin measurements (70.0° ± 15.0°; Hébrard et al. 2008; 37.3° ± 3.7°; Winn et al. 2009; 37.3° ± 3.0°; Hirano et al. 2011) may have stemmed from systematic noise sources.

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Ponzo, Felice Carlo, Chiara Iacovino, Rocco Ditommaso, Manuela Bonano, Riccardo Lanari, Francesco Soldovieri, Vincenzo Cuomo, Francesca Bozzano, Paolo Ciampi et Matteo Rompato. « Transport Infrastructure SHM Using Integrated SAR Data and On-Site Vibrational Acquisitions : “Ponte Della Musica–Armando Trovajoli” Case Study ». Applied Sciences 11, n^o 14 (15 juillet 2021) : 6504. http://dx.doi.org/10.3390/app11146504.

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This work presents the first results obtained by applying in situ and remote-sensing methodologies to monitor the Ponte della Musica-Armando Trovajoli located in Rome, within the activities of the WP6 “Structural Health Monitoring and Satellite Data” 2019-21 Reluis Project. In particular, the use of remote-sensing Differential Synthetic Aperture Radar (SAR) Interferometry (DInSAR) measurements provided a spatial map of the displacement of the investigated infrastructure and the corresponding time-series, with the aim of monitoring deformation phenomena, focusing on the local scale analysis, which produces suitable results for urban monitoring and damage assessment. The DInSAR results have been integrated with the identification of the dynamic characteristics of the bridge, performed through an experimental campaign of ambient vibration measurements carried out in October 2020 and with the local-scale definition of the engineering geological setting of the foundation soil. The subsoil of the bridge is constituted by more than 50 m of recent alluvial deposits resting on Pliocene stiff clay acting as a geological bedrock. A substantially stable behavior of the bridge structural elements has been observed based on the analysis of both satellite and velocimetric data. This case represents a good example about how the integration of in situ sensors with remotely sensed data and the exploitation of a detailed knowledge regarding the on-site conditions represent a key factor for a sustainable structural and infrastructural monitoring and can support the planning both of maintenance and safety management.

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Jones, Matías I., Rafael Brahm, Nestor Espinoza, Songhu Wang, Avi Shporer, Thomas Henning, Andrés Jordán et al. « HD 2685 b : a hot Jupiter orbiting an early F-type star detected by TESS ». Astronomy & ; Astrophysics 625 (mai 2019) : A16. http://dx.doi.org/10.1051/0004-6361/201834640.

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We report on the confirmation of a transiting giant planet around the relatively hot (Teff = 6801 ± 76 K) star HD 2685, whose transit signal was detected in Sector 1 data of NASA’s TESS mission. We confirmed the planetary nature of the transit signal using Doppler velocimetric measurements with CHIRON, CORALIE, and FEROS, as well as using photometric data obtained with the Chilean-Hungarian Automated Telescope and the Las Cumbres Observatory. From the joint analysis of photometry and radial velocities, we derived the following parameters for HD 2685 b: P = 4.12688−0.00004+0.00005 days, e = 0.091−0.047+0.039, MP = 1.17 ± 0.12 MJ, and RP =1.44 ± 0.05 RJ. This system is a typical example of an inflated transiting hot Jupiter in a low-eccentricity orbit. Based on the apparent visual magnitude (V = 9.6 mag) of the host star, this is one of the brightest known stars hosting a transiting hot Jupiter, and it is a good example of the upcoming systems that will be detected by TESS during the two-year primary mission. This is also an excellent target for future ground- and space-based atmospheric characterization as well as a good candidate for measuring the projected spin-orbit misalignment angle through the Rossiter–McLaughlin effect.

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Triaud, Amaury H. M. J., Matthew R. Standing, Neda Heidari, David V. Martin, Isabelle Boisse, Alexandre Santerne, Alexandre C. M. Correia et al. « BEBOP III. Observations and an independent mass measurement of Kepler-16 (AB) b – the first circumbinary planet detected with radial velocities ». Monthly Notices of the Royal Astronomical Society 511, n^o 3 (23 février 2022) : 3561–70. http://dx.doi.org/10.1093/mnras/stab3712.

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ABSTRACT The radial velocity method is amongst the most robust and most established means of detecting exoplanets. Yet, it has so far failed to detect circumbinary planets despite their relatively high occurrence rates. Here, we report velocimetric measurements of Kepler-16A, obtained with the SOPHIE spectrograph, at the Observatoire de Haute-Provence’s 193cm telescope, collected during the BEBOP survey for circumbinary planets. Our measurements mark the first radial velocity detection of a circumbinary planet, independently determining the mass of Kepler-16 (AB) b to be $0.313 \pm 0.039\, {\rm M}_{\rm Jup}$, a value in agreement with eclipse timing variations. Our observations demonstrate the capability to achieve photon-noise precision and accuracy on single-lined binaries, with our final precision reaching $\rm 1.5~m\, s^{-1}$ on the binary and planetary signals. Our analysis paves the way for more circumbinary planet detections using radial velocities which will increase the relatively small sample of currently known systems to statistically relevant numbers, using a method that also provides weaker detection biases. Our data also contain a long-term radial velocity signal, which we associate with the magnetic cycle of the primary star.

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Barbosa, Claudia C., Mírley B. Souza, Sarah R. R. A. Scalercio, Ticiana F. P. Silva, Sheyla F. S. Domingues et Lúcia D. M. Silva. « Ovarian and uterine periovulatory Doppler ultrasonography in bitches ». Pesquisa Veterinária Brasileira 33, n^o 9 (septembre 2013) : 1144–50. http://dx.doi.org/10.1590/s0100-736x2013000900016.

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This paper aims to describe the uterine and ovarian ultrasonographic characteristics and Doppler velocimetric features of their arteries in bitches during the periovulatory period. Fifteen estrous cycles in 10 animals were evaluated. The ultrasonographic characteristics, resistance indices (RI) and pulsatility indices (PI) of the uterus and ovaries in each animal were recorded 5 days before and after ovulation (D0). The data were statistically analyzed, and the results were expressed as the mean ± standard error of mean (P<0.05). In results the ultrasonographic features of the uterus were the same on all of the cycles and evaluated days. The uterus had an average diameter of 0.85±0.02cm. An increase in the volume of the ovaries and the diameter of the ovarian follicles were measured. Ovaries had a volume of 0.64±0.06cm³, and the follicles cavities had a diameter of 0.46 ± 0.01 cm on the day of ovulation. After ovulation, it was observed that some follicles not collapse in some cycles. Two days prior to ovulation, the uterine blood perfusion decreased. This decrease remained unchanged until ovulation. Following ovulation, we measured a gradual increase in the uterine perfusion and in the ovarian artery. This artery directed blood flow to the ovaries and increased the intra-ovarian perfusion on the day after ovulation. In conclusion, specific features are observed in the uterus and ovarian ultrasound image and Doppler values of their arteries presented on the periovulatory days and when associated allow to estimate more accurately the date of ovulation.

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Actes de conférences sur le sujet "Dati velocimetrici"

Dilling, S., et B. MacVicar. « Good, bad and the ugly : Seasonal filtering and Autoregressive Moving Average (ARMA) models for detecting and replacing spikes in velocimetric profile data ». Dans The International Conference On Fluvial Hydraulics (River Flow 2016). Taylor & Francis Group, 6000 Broken Sound Parkway NW, Suite 300, Boca Raton, FL 33487-2742 : CRC Press, 2016. http://dx.doi.org/10.1201/9781315644479-61.

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