scholarly journals Follow-up of the activity and composition of the interstellar comet 2I/Borisov with MUSE

2020 ◽  
Author(s):  
Cyrielle Opitom ◽  
Michele Bannister ◽  
Philippe Rousselot ◽  
Alan Fitzsimmons ◽  
Aurélie Guilbert-Lepoutre ◽  
...  
Keyword(s):  
Solar System ◽  
Resolving Power ◽  
Large Field ◽  
Data Sets ◽  
Production Rates ◽  
Great Opportunity ◽  
Astrophysical Journal ◽  
Extended Sources ◽  
Integral Field Spectrograph

<p>The interstellar comet 2I/Borisov was discovered on August 20, 2019. It is only the second interstellar object to be observed crossing our Solar System, and the first one for which outgassing was detected directly [1]. Early observations indicated that 2I/Borisov is depleted in C<sub>2</sub>, similarly to about 30% of Solar System comets [2,3]. Preliminary observations with the MUSE IFU performed in November 2019 confirmed that 2I is depleted in C<sub>2 </sub>but also showed it is rich in NH<sub>2 </sub>[4]. We present here results from the full observing campaign performed with the MUSE instrument.</p> <p>MUSE is a multi-unit integral field spectrograph mounted on the UT4 telescope of the VLT [5].  The instrument covers the wavelength range from 480 to 930 nm with a resolving power of about 3000. It has a large field of view of 1’x1’ and a spatial resolution of 0.2”, which makes it an ideal instrument to study extended sources. We observed 2I with MUSE on 16 different dates between November 14, 2019 and March 19, 2020. The observations started about one month before the perihelion passage and continued until the comet reached 3 au post-perihelion. This data sets constitutes a great opportunity to study the activity and coma composition of 2I over several months.</p> <p>Our observations allow us to detect emission bands from C<sub>2</sub>, NH<sub>2</sub>, and CN. Using a Haser model [6] we derive production rates for those 3 species and follow their evolution. We also study the evolution of the ratio between those production rates, to monitor how the composition of 2I coma changes as a function of time and distance from the Sun.</p> <p><strong>References:</strong></p> <p>[1] Fitzsimmons et al., 2019, The Astrophysical Journal Letters, Volume 885, Issue 1, article id. L9, 6 pp.[2] Opitom et al., 2019, Astronomy & Astrophysics, Volume 631, id.L8, 5 pp.; [3] Lin et al., 2019, The Astrophysical Journal Letters, Volume 889, Issue 2, id.L30;[4] Bannister et al, 2020, submitted to ApJ Letters; [5] Bacon et al, 2010, Proceedings of the SPIE, Volume 7735, id. 773508; [6]  Haser, 1957,Bulletin de la Classe des Sciences de l'Académie Royale de Belgique, vol. 43, p. 740-750</p>

Data Management in an Epidemiological Study : Experiences from the Iowa 500 Field Follow-up and Family Study

1980 ◽  
Vol 19 (01) ◽  
pp. 37-41
Author(s):  
R. F. Woolson ◽  
M. T. Tsuang ◽  
L. R. Urban
Keyword(s):  
Data Management ◽  
Epidemiological Study ◽  
Family Study ◽  
Data Sets ◽  
Data Handling ◽  
Management Decisions ◽  
Numerous Data ◽  
Made In

We are now conducting a forty-year follow-up and family study of 200 schizophrenics, 325 manic-depressives and 160 surgical controls. This study began in 1973 and has continued to the present date. Numerous data handling and data management decisions were made in the course of collecting the data for the project. In this report some of the practical difficulties in the data handling and computer management of such large and bulky data sets are enumerated.

Stereotactic radiation treatment planning and follow-up studies involving fused multimodality imaging

2004 ◽  
Vol 101 (Supplement3) ◽  
pp. 326-333 ◽  
Author(s):  
Klaus D. Hamm ◽  
Gunnar Surber ◽  
Michael Schmücking ◽  
Reinhard E. Wurm ◽  
Rene Aschenbach ◽  
...  
Keyword(s):  
Image Fusion ◽  
Treatment Planning ◽  
Radiation Treatment ◽  
Data Sets ◽  
Slice Thickness ◽  
Radiation Treatment Planning ◽  
Content Type ◽  
Follow Up Studies ◽  
Fine Print

Object. Innovative new software solutions may enable image fusion to produce the desired data superposition for precise target definition and follow-up studies in radiosurgery/stereotactic radiotherapy in patients with intracranial lesions. The aim is to integrate the anatomical and functional information completely into the radiation treatment planning and to achieve an exact comparison for follow-up examinations. Special conditions and advantages of BrainLAB's fully automatic image fusion system are evaluated and described for this purpose. Methods. In 458 patients, the radiation treatment planning and some follow-up studies were performed using an automatic image fusion technique involving the use of different imaging modalities. Each fusion was visually checked and corrected as necessary. The computerized tomography (CT) scans for radiation treatment planning (slice thickness 1.25 mm), as well as stereotactic angiography for arteriovenous malformations, were acquired using head fixation with stereotactic arc or, in the case of stereotactic radiotherapy, with a relocatable stereotactic mask. Different magnetic resonance (MR) imaging sequences (T1, T2, and fluid-attenuated inversion-recovery images) and positron emission tomography (PET) scans were obtained without head fixation. Fusion results and the effects on radiation treatment planning and follow-up studies were analyzed. The precision level of the results of the automatic fusion depended primarily on the image quality, especially the slice thickness and the field homogeneity when using MR images, as well as on patient movement during data acquisition. Fully automated image fusion of different MR, CT, and PET studies was performed for each patient. Only in a few cases was it necessary to correct the fusion manually after visual evaluation. These corrections were minor and did not materially affect treatment planning. High-quality fusion of thin slices of a region of interest with a complete head data set could be performed easily. The target volume for radiation treatment planning could be accurately delineated using multimodal information provided by CT, MR, angiography, and PET studies. The fusion of follow-up image data sets yielded results that could be successfully compared and quantitatively evaluated. Conclusions. Depending on the quality of the originally acquired image, automated image fusion can be a very valuable tool, allowing for fast (∼ 1–2 minute) and precise fusion of all relevant data sets. Fused multimodality imaging improves the target volume definition for radiation treatment planning. High-quality follow-up image data sets should be acquired for image fusion to provide exactly comparable slices and volumetric results that will contribute to quality contol.

scholarly journals Enhanced Care Assistant Training to Address the Workforce Crisis in Home Care: Changes Related to Job Satisfaction and Career Commitment

2007 ◽  
Vol 8 (2) ◽  
pp. 71-81 ◽  
Author(s):  
Constance L. Coogle ◽  
Iris A. Parham ◽  
Rita Jablonski ◽  
Jason A. Rachel
Keyword(s):  
Job Satisfaction ◽  
Home Care ◽  
Career Commitment ◽  
Management Training ◽  
Data Sets ◽  
Term Care ◽  
Training Models ◽  
Intrinsic Job Satisfaction

Changes in job satisfaction and career commitment were observed as a consequence of a geriatric case management training program focusing on skills development among personal care attendants in home care. A comparison of pretraining and posttraining scores uncovered a statistically significant increase in Intrinsic Job Satisfaction scores for participants 18–39 years of age, whereas levels declined among the group of middle aged participants and no change was observed among participants age 52 and older. On the other hand, a statistically significant decline in Extrinsic Job Satisfaction was documented over all participants, but this was found to be primarily due to declines among participants 40–51 years of age. When contacted 6–12 months after the training series had concluded, participants indicated that the training substantially increased the likelihood that they would stay in their current jobs and improved their job satisfaction to some extent. A comparison of pretraining and posttraining scores among participants providing follow-up data revealed a statistically significant improvement in levels of Career Resilience. These results are discussed as they relate to similar training models and national data sets, and recommendations are offered for targeting future educational programs designed to address the long-term care workforce shortage.

scholarly journals Chemistry of the Solar System Revealed in the Interiors of the Giant Planets

2011 ◽  
Vol 7 (S280) ◽  
pp. 249-260 ◽  
Author(s):  
Jonathan I. Lunine
Keyword(s):  
Solar System ◽  
Microwave Radiometer ◽  
Giant Planets ◽  
Isotopic Ratios ◽  
Data Sets ◽  
Terrestrial Water ◽  
Galileo Probe ◽  
Probe Mission ◽  
Juno Mission

AbstractThe giant planets of our solar system contain a record of elemental and isotopic ratios of keen interest for what they tell us about the origin of the planets and in particular the volatile compositions of the solid phases. In situ measurements of the Jovian atmosphere performed by the Galileo Probe during its descent in 1995 demonstrate the unique value of such a record, but limited currently by the unknown abundance of oxygen in the interior of Jupiter–a gap planned to be filled by the Juno mission set to arrive at Jupiter in July of 2016. Our lack of knowledge of the oxygen abundance allows for a number of models for the Jovian interior with a range of C/O ratios. The implications for the origin of terrestrial water are briefly discussed. The complementary data sets for Saturn may be obtained by a series of very close, nearly polar orbits, at the end of the Cassini-Huygens mission in 2016-2017, and the proposed Saturn Probe. This set can only obtain what we have for Jupiter if the Saturn Probe mission carries a microwave radiometer.

scholarly journals Long-term survival of corneal transplants and visual outcomes among private patients of corneal surgeons in Metropolitan Manila (the Philippines)

2017 ◽  
Vol 15 (4) ◽  
Author(s):  
David Francis Fullon Chan ◽  
Ma. Dominga B. Padilla
Keyword(s):  
Survival Rates ◽  
The Philippines ◽  
Clinical Findings ◽  
Data Sets ◽  
Eye Bank ◽  
Term Survival ◽  
Visual Outcomes ◽  
Corneal Transplants ◽  
Tissue Characteristics

PURPOSE: There are currently no published studies on the outcomes of keratoplasty in the Philippines.  This study aimed to report graft survival rates at years 1, 3, and 5 after surgery, visual outcomes, and causes of graft failure among private patients of corneal surgeons in Metropolitan Manila receiving tissue from a single local eye bank in the period 2008-2012.  DESIGN: Retrospective cohort, multicenter study. METHODS: POPULATION: Private patients of Metro Manila corneal surgeons, receiving tissue from the Santa Lucia International Eye Bank of Manila in 2008-2012.  241 of 593 yielded sufficiently complete data sets. PROCEDURE: Donor and tissue characteristics, pre-op and latest follow-up characteristics/clinical findings were retrieved and processed. Data from the eye bank was merged with follow-up data from surgeons submitted March-October 2014. MAIN OUTCOME MEASURES: Survival rates at 1, 3, and 5 years; best-corrected visual acuity as of latest follow-up; causes of failure. RESULTS:  1-year survival: 90.4%, 3-year: 71.5%, 5-year: ~52.7%. Overall, 43.5% had VA of 20/50 or better, and 25% counting fingers or worse, with variations across diagnoses. CONCLUSION: Though small in sample size and response rate, survival trends parallel studies with larger populations elsewhere. Specific trends like favorable survival in keratoconus were consistent. Indications for surgery have changed little since 2005, but regraft has become the most common indication. Further data collection and completion are required for multivariate analysis on factors regarding survival.  Inflammation, infection, trauma, poor adherence are among the identified reasons for failure.  

scholarly journals High-Performance Computing of BEAST/BEAGLE in Bayesian Phylogenetics using SDumont Hybrid Resources

2020 ◽  
Author(s):  
Kary Ocaña ◽  
Micaella Coelho ◽  
Guilherme Freire ◽  
Carla Osthoff
Keyword(s):  
High Performance Computing ◽  
High Performance ◽  
Current Knowledge ◽  
Data Sets ◽  
Length Estimation ◽  
Computationally Intensive ◽  
Mcmc Chain ◽  
Performance Computing ◽  
Insight Into

Bayesian phylogenetic algorithms are computationally intensive. BEAST 1.10 inferences made use of the BEAGLE 3 high-performance library for efficient likelihood computations. The strategy allows phylogenetic inference and dating in current knowledge for SARS-CoV-2 transmission. Follow-up simulations on hybrid resources of Santos Dumont supercomputer using four phylogenomic data sets, we characterize the scaling performance behavior of BEAST 1.10. Our results provide insight into the species tree and MCMC chain length estimation, identifying preferable requirements to improve the use of high-performance computing resources. Ongoing steps involve analyzes of SARS-CoV-2 using BEAST 1.8 in multi-GPUs.

Penetrating aortic ulcer

ESC CardioMed ◽  
2018 ◽  
pp. 2602-2604
Author(s):  
Arturo Evangelista ◽  
José Rodríguez-Palomares
Keyword(s):  
Open Surgery ◽  
Aortic Rupture ◽  
Imaging Techniques ◽  
Large Field ◽  
Intramural Haematoma ◽  
Acute Aortic Syndrome ◽  
Penetrating Aortic Ulcer ◽  
Rapid Enlargement ◽  
The Media

Penetrating aortic ulcer is a disease of the intima produced by an ulceration of atherosclerotic plaque penetrating to the media of the aortic wall. Although diagnosis can be made by all imaging techniques, computed tomography is the most useful technique due to its high spatial resolution and large field of view. Natural evolution is completely different if penetrating aortic ulcer is diagnosed in the contest of an acute aortic syndrome or incidentally. The presence of pain, rapid enlargement of the ulcer size, and intramural haematoma have been considered predictors of serious complications. In these cases, open surgery or endovascular treatment should be indicated to prevent aortic rupture. In stable and asymptomatic cases, control of blood pressure and close follow-up by imaging techniques is recommended.

scholarly journals Extreme and Far Ultraviolet Astronomy from Voyagers 1 and 2

1990 ◽  
Vol 123 ◽  
pp. 49-57
Author(s):  
J.B. Holberg
Keyword(s):  
Photon Counting ◽  
Large Field ◽  
Data Sets ◽  
Diffuse Emission ◽  
Ultraviolet Astronomy ◽  
Wide Range ◽  
Valuable Complement ◽  
Scientific Results ◽  
Stellar Sources ◽  
Far Ultraviolet

AbstractThe instrumental characteristics, observational capabilities and scientific results of the Voyager 1 and 2 ultraviolet spectrometers are reviewed. These instruments provide current and ongoing access to low resolution spectra for a wide variety of astronomical sources in the 500 to 1700 Å band. Observations of the brightest OB stars and hot subluminous stars as faint as V = 15 mag. are possible. In the EUV, at wavelengths shortward of 900 Å, several new sources have been detected and a host of potential sources ruled out. In the Far UV, particularly at wavelengths between 900 and 1200 Å, Voyager is capable of observing a wide range of stellar and non-stellar sources. Such observations can often provide a valuable complement to IUE and other data sets at longer wavelengths. The Voyager spectrometers have proved remarkably stable photon counting instruments, capable of extremely long integration times. The long integration times, relatively large field of view, and location in the outer solar system also provide an ideal platform for observations of sources of faint diffuse emission, such as nebulae and the general sky background.

scholarly journals Biases in retrieving planetary signals in the presence of quasi-periodic stellar activity

2019 ◽  
Vol 489 (2) ◽  
pp. 2555-2571 ◽  
Author(s):  
M Damasso ◽  
M Pinamonti ◽  
G Scandariato ◽  
A Sozzetti
Keyword(s):  
Time Series ◽  
Gaussian Process Regression ◽  
Data Sets ◽  
Correlated Noise ◽  
Stellar Activity ◽  
Activity Component ◽  
Low Mass ◽  
Host Stars ◽  
Correlated Signals

Abstract Gaussian process regression is a widespread tool used to mitigate stellar correlated noise in radial velocity (RV) time series. It is particularly useful to search for and determine the properties of signals induced by small-sized low-mass planets (Rp < 4 R⊕, mp < 10 M⊕). By using extensive simulations based on a quasi-periodic representation of the stellar activity component, we investigate the ability in retrieving the planetary parameters in 16 different realistic scenarios. We analyse systems composed by one planet and host stars having different levels of activity, focusing on the challenging case represented by low-mass planets, with Doppler semi-amplitudes in the range 1–3 $\rm{\,m\,s^{-1}}$. We consider many different configurations for the quasi-periodic stellar activity component, as well as different combinations of the observing epochs. We use commonly employed analysis tools to search for and characterize the planetary signals in the data sets. The goal of our injection-recovery statistical analysis is twofold. First, we focus on the problem of planet mass determination. Then, we analyse in a statistical way periodograms obtained with three different algorithms, in order to explore some of their general properties, as the completeness and reliability in retrieving the injected planetary and stellar activity signals with low false alarm probabilities. This work is intended to provide some understanding of the biases introduced in the planet parameters inferred from the analysis of RV time series that contain correlated signals due to stellar activity. It also aims to motivate the use and encourage the improvement of extensive simulations for planning spectroscopic follow-up observations.

scholarly journals Solar System Science with Robotic Telescopes

2011 ◽  
Vol 7 (S285) ◽  
pp. 352-354
Author(s):  
T. A. Lister
Keyword(s):  
Solar System ◽  
Automated System ◽  
System Science ◽  
Sky Surveys ◽  
The Earth ◽  
Solar System Objects ◽  
Robotic Telescopes ◽  
On Line ◽  
Near Earth Objects

AbstractAn increasing number of sky surveys is already on-line or soon will be, leading to a large boost in the detection of Solar System objects of all types. For Near-Earth Objects (NEOs) that could potentially hit the Earth, timely follow-up is essential. I describe the development of an automated system which responds to new detections of NEOs from Pan-STARRS and automatically observes them with the LCOGT telescopes. I present results from the first few months of operation, and plans for the future with the 6-site, 40-telescope global LCOGT Network.

Sign in / Sign up

Export Citation Format

Share Document