Experimental Evidence of the Collective Brillouin Scattering of Multiple Laser Beams Sharing Acoustic Waves.

The indirect-drive scheme to inertial confinement fusion uses a large number of laser beams arranged in a symmetric angular distribution. Collective laser plasma instabilities can therefore develop that couple all the incident laser waves located in a cone to the daughter wave growing along the cone symmetry axis [D. F. DuBois et al., Phys. Fluids B 4, 241 (1992)]. With complementary diagnostics of Thomson scattering and of the scattered light, we demonstrate the occurrence of collective stimulated Brillouin sidescattering driving collective acoustic waves in indirect-drive experiments.

Experimental demonstration of X-ray drive enhancement with rugby-shaped hohlraums.

Rugby-shaped hohlraums have been suggested as a way to enhance x-ray drive in the indirect drive approach to inertial confinement fusion. This Letter presents an experimental comparison of rugby-shaped and cylinder hohlraums used for D2 and D3He-filled capsules implosions on the Omega laser facility, demonstrating an increase of x-ray flux by 18% in rugby-shaped hohlraums. The highest yields to date for deuterium gas implosions in indirect drive on Omega (1.5x10{10} neutrons) were obtained, allowing for the first time the measurement of a DD burn history. Proton spectra measurements provide additional validation of the higher drive in rugby-shaped hohlraums.

[Surgical management of traumatic ear amputations: literature review]. / Prise en charge des amputations traumatiques de l'oreille : revue de la littérature.

Traumatic ear amputation (TEA) is a complete avulsion of a part or of the total auricular tissue. TEA are rare (only 74 cases have been described in the literature) and their handling is complex. The surgeon's objective is to obtain the best cosmetic result without demolishing the auricular area in order to allow future ear reconstruction in case of replantation failure. Many techniques of ear replantation have been described in the literature during the last 30 years: microsurgical replantation, pocket techniques and reattachment techniques. Microsurgical replantation should be achieved every time it is possible. When it is not possible, the surgeon can choose between ear reattachment and a pocket technique according to two clinical features: the size of the amputated part and the involvement of the ear lobe. Ear reattachment can be achieved when the amputated part is smaller than 15 mm or when amputation involves the earlobe. Pocket techniques, which are appropriate for the replantation of the auricular cartilage, can be used when the amputated part is bigger than 15 mm and does not comprise the earlobe.

[Perilunate dislocations and fracture-dislocations of the wrist, a review of 14 cases]. / Luxations et fractures-luxations périlunaires du carpe, étude rétrospective d'une série de 14 cas.

OBJECTIVES: We report a retrospective series of 14 dislocations or perilunate fracture-dislocations. The results of our series are compared with the data of the literature and we discuss epidemiology, types of lesions, surgical treatment, complications and prognosis of this pathology. METHODS: The series included seven pure dislocations and seven fracture-dislocations including three trans-scapho-lunate forms (including one Fenton's syndrome). The displacement of all these lesions was posterior. The mean age was 35 years. Sixty-four percent were manual workers. All 14 patients had undergone surgical treatment through a dorsal approach in the first seven days following the injury. They were reviewed clinically and radiologically with a mean follow-up of 25 months. RESULTS: The average Cooney functional score was 72/100 with two excellent, six good, four fair and two poor results. Average flexion-extension motion arc was 74%, the grip strength was 77% compared to the other wrist. Persistent wrist pain was almost constant. One carpal instability was observed and one patient required a four-corner arthrodesis for SLAC wrist. Eighty-five percent of all patients were employed at least. CONCLUSIONS: Early diagnosis and anatomical reduction can provide satisfactory functional results. Emergency surgical treatment is required. We prefer a dorsal approach and we do not perform primary closed reductions.

[Traumatic pseudo-boutonniere of the metacarpophalangeal joint of the little finger. Case report and review of the literature]. / Pseudoboutonnière traumatique de l'articulation métacarpophalangienne du cinquième doigt: a propos d'un cas et revue de la littérature.

Dislocation of the extensor tendon over the metacarpophalangeal joint is common among patients with rheumatoid arthritis. Patients without arthritis are exceptionally involved. The authors describe a new case of traumatic boutonniere-like of the metacarpophalangeal joint of the little finger. This lesion is a rarely, only eleven cases are described in literature. Patients are usually young adults and dislocation is related to a direct axial trauma on their fifth metacarpophalangeal joint. Diagnosis is clinical and relies on an incomplete active extension of the metacarpophalangeal joint, secondary to the dislocation of the extensor apparatus. Diagnosis is often delayed the lesion remaining unnoticed with the occurrence of others hand lesions. Proper treatment is surgery, based on suturing side to side both extensor digiti minimi and common extensor tendon over the fifth metacarpophalangeal joint. Results are excellent, with a complete range of motion and the absence of recurrence.