394 research outputs found
Ongoing care for the patient with an anorectal malfromation; transitioning to adulthood
No full textPlanned health care transition can improve the ability of young adults to manage their own health care to effecively use health services and ultimately maximize life-long functioning and well-being. Transitional care is a purposeful, planned process that addresses the medical, psychosocial and educational needs of adolescents and young adults with chronic physical and medical conditions as they move from child-centered to adult-oriented healthcare systems. Unsuccessful surgical transtion may result in physical and mental health implications for young patients, negative long-term outcomes and suboptimal use of health care resources. Anorectal malformation and Hirschsprung patients are an especially vulnerable patient population with ongoing surgical, physiologic and pyschosocial challenges
LIBS measurements inside the FTU vessel mock-up by using a robotic arm
No full textThe amount of tritium (T) retained in plasma facing components (PFCs) and in-vessel structures has to be carefully monitored in ITER because of the limits fixed by safety issues. Laser-Induced-Breakdown-Spectroscopy (LIBS) is one of the eligible techniques for this task because it does not require any sample pre-treatment (or removal), it can work both in atmospheric pressure or in vacuum, with different background gases. LIBS can be set up both on a robotic arm entering the vacuum vessel or outside it, for analyses during shut-down periods or in-between plasma discharges. In this paper we describe a new, compact LIBS system, mounted on the Frascati Tokamak Upgrade (FTU) robotic arm, to perform measurements on ITER-relevant samples placed in the FTU mock-up. The samples, composed of thin layers (few μm) of W, Al, D, simulate the co-deposition of Be with T on ITER divertor tiles (Be and T are replaced by Al and D in the samples). W, Al, D emission lines has been clearly detected, both as major constituents or in trace quantities, with different background gases using a single laser pulse
Laser-induced breakdown spectroscopy for helium detection in beryllium coatings
No full textLaser Induced Breakdown Spectroscopy (LIBS) method is considered to be a promising tool for analyzing the retention of hydrogen isotopes (D and T) and helium (He) on the first walls and divertor regions of future fusion reactors. Helium will be produced in DT reactions but could also be used in the initial non-nuclear phases of DEMO concepts. The present study investigates the He detection by LIBS method in the Be coatings simulating the deposits on the divertor plasma-facing components of JET while the results are also relevant for He detection in the deposits of other wall materials. The study was carried out in a vacuum vessel filled with 2–40 mbar argon background gas. It was shown that 2.8 at. % of He was confidently detectable by LIBS at optimized measurement conditions and the estimated limit of detection at used experimental conditions is approximately 0.7 at. %. The intensity of the He emission line at 587.56 nm was the strongest at the center of the laser-induced plasma plume. The He line intensity increased with the pressure of Ar gas but the broadening of the He line and the increase of the background emission and noise set an upper limit to the Ar background pressure usable for He detection. The application of the calibration-free LIBS procedure resulted in the overestimation of the He/Be ratio by several orders of magnitude. The overestimation can be explained by the deviation of LIBS plasma from the local thermodynamic equilibrium, which is caused by the very high excitation energy of He atoms
LHC gets the ball rolling
No full text1. The multidisciplinary team responsible for the RF ball project to check the interconnections. From left to right: Rhodri Jones (AB/BI), Eva Calvo (AB/BI), Francesco Bertinelli (AT/MCS), Sonia Bartolome Jimenez (TS/IC), Sylvain Weisz (TS/IC), Paul Cruikshank (AT/VAC), Willemjan Maan (AT/VAC), Alain Poncet (AT/MCS), Marek Gasior (AB/BI).2. During the tests the ball is inserted very carefully into the vacuum chamber.1. Le groupe pluridisciplinaire qui a mené le projet de balle RF pour vérifier les interconnexions avec, de gauche à droite, Rhodri Jones (AB/BI), Eva Calvo (AB/BI), Francesco Bertinelli (AT/MCS), Sonia Bartolome Jimenez (TS/IC), Sylvain Weisz (TS/IC), Paul Cruikshank (AT/VAC), Willemjan Maan (AT/VAC), Alain Poncet (AT/MCS) et Marek Gasior (AB/BI).2. Lors des tests, la balle est insérée dans la chambre à vide avec beaucoup de précaution.</p
LIBS diagnostics of Be-based samples with different gas impurities
No full textControlling plasma fuel retained in the plasma facing components of the first wall of a fusion reactor is one of the most important challenges influencing safe operation of the International Thermonuclear Experimental Reactor in the first place. This issue is proposed to be addressed by the laser-induced breakdown spectroscopy (LIBS) diagnostics, which is particularly powerful in studying the near-surface deposits and analyzing their composition. The main goal of the present study is determining the depth profiles of different elements in beryllium-based materials and the possible co-deposited layers that are formed on the walls of the Joint European Torus (JET) fusion device. Depth profiles estimated by LIBS are compared with those measured by secondary ion mass spectrometry, furthermore, the differences are discussed. In particular, the evolution of spectral lines of Be, as well as the main gaseous elements, such as Ne, N, O, and D, incorporated into the samples were extracted at different depths in the layers. LIBS diagnostics allowed making a fairly accurate analysis of the detected spectral lines of the elements on the samples. The effect of variations of the ablation rate and uncertainty that it introduces in LIBS measurements was also discussed. This investigation will have a significant impact on the development of pre-processing algorithms for machine learning models in terms of adaptation models operating on synthetic data for processing experimental spectra and is important from a point of view of LIBS tests being under preparation at JET
Possibilities of applications of fiber Bragg gratings for thermonuclear fusion technology
No full textPesticide Safety Regulation under the Federal Insecticide, Fungicide and Rodenticide Act: Debacle at the EPA
No full textReview on developments in LIS (laser ion source) at the IPPLM and its possible applications in photonics
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