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Sleep disturbances are associated with an increased risk of suicidal behavior. The evidence primarily stems from studies based on questionnaires about sleep quality. In recent years, the availability of wearable health technology has increased and offers an inexpensive, appealing, and accessible way to measure sleep.
Our aim is to assess the feasibility and acceptability of wearable sleep tracking monitoring devices in a sample of suicide attempters.
A prospective, open-label, 12-months study will be conducted in the emergency department (ED) and psychiatric unit (PU) of the university hospital of Brest, France. Inclusion criteria are male or female aged 18 or over, surviving a suicide attempt, discharged from ED or PU, and giving consent. The sleep tracker and a smartphone will be given to the patient after discharge. He or she will receive brief training on how to use the sleep tracker. Patient will be asked to monitor their sleep during the five days following the discharge. The feasibility will be explored by analyzing the data proceeding from the sleep tracker. The acceptability will be assessed during the five-days follow up visit, using a standardized questionnaire.
Preliminary results of this ongoing study show that feasibility and acceptance may be related to technical features of wearable devices.
A better understanding of the bidirectional mechanism between sleep disturbances and suicide behavior will allow the design of tailored interventions to prevent suicide attempts.
Disclosure of interest
The authors have not supplied their declaration of competing interest.
The Laboratoire des Sciences du Climat et de l'Environnement (LSCE) research program on prehistoric art conducts chronological studies of parietal representations with their associated archaeological context. This multidisciplinary approach provides chronological arguments about the creation period of parietal representations. This article presents chronological investigations carried out in several decorated caves in France (La Grande Grotte, Labastide, Lascaux, La Tête-du-Lion, Villars) and Spain (La Garma, Nerja, La Pileta, Urdiales). Several types of organic materials, collected from different areas of the caves close to the walls and in connection with parietal art, were dated to determine the periods of human presence in the cave, a presence that may have been related to artistic activities. These new radiocarbon results range from 33,000–29,000 (La Grande Grotte) to 16,000–14,000 cal BP (Urdiales).
To determine the peak pressure induced versus the incident intensity of a neodymium (Nd) glass pulsed laser, with a duration of 25 ns in glass confined geometry, two methods have been comparatively used. Free surface velocity measurements have been performed using an electromagnetic gauge. The results are compared with pressure measurements realized at the back of irradiated aluminum targets with the use of polyvinylidene fluoride (PVDF) gauges. Both diagnostics provide consistent results. The measurements of peak pressure as a function of laser irradiance are used to determine the calibration curve (current density versus loading pressure) for new VF2/VF3 copolymer shock gauges used in this lasermatter interaction configuration. These experimental set-up deliver time resolved measurements that are interpreted by the shock-propagation phenomena.
Optimization of deoxidizer sequencing, such as Al and Ti, is
an important topic which can provide improvement in terms
of inclusion composition and process stability. Nevertheless,
modeling inclusion nucleation and growth in a ladle is still a
challenge, since different complex mechanisms are involved.
The paper describes key steps which involve an important
modeling investigation. The first step deals with deoxidizer melting
in a turbulent steel bath. The second is devoted to nucleation
and growth of inclusions: thermodynamics criteria for inclusion
precipitation and turbulent agglomeration of clusters should be
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