Reduced instability growth with high-adiabat high-foot implosions at the National Ignition Facility.

Hydrodynamic instabilities are a major obstacle in the quest to achieve ignition as they cause preexisting capsule defects to grow and ultimately quench the fusion burn in experiments at the National Ignition Facility. Unstable growth at the ablation front has been dramatically reduced in implosions with "high-foot" drives as measured using x-ray radiography of modulations at the most dangerous wavelengths (Legendre mode numbers of 30-90). These growth reductions have helped to improve the performance of layered DT implosions reported by O. A. Hurricane et al. [Nature (London) 506, 343 (2014)], when compared to previous "low-foot" experiments, demonstrating the value of stabilizing ablation-front growth and providing directions for future ignition designs.

Dilation x-ray imager a new∕faster gated x-ray imager for the NIF.

As the yield on implosion shots increases it is expected that the peak x-ray emission reduces to a duration with a FWHM as short as 20 ps for ∼7 × 10(18) neutron yield. However, the temporal resolution of currently used gated x-ray imagers on the NIF is 40-100 ps. We discuss the benefits of the higher temporal resolution for the NIF and present performance measurements for dilation x-ray imager, which utilizes pulse-dilation technology [T. J. Hilsabeck et al., Rev. Sci. Instrum. 81, 10E317 (2010)] to achieve x-ray imaging with temporal gate times below 10 ps. The measurements were conducted using the COMET laser, which is part of the Jupiter Laser Facility at the Lawrence Livermore National Laboratory.

Application of computers in clinics in Singapore: status and doctors' perceptions.

A survey of 67 private clinics in Singapore indicates a positive trend towards use of computer-based information systems for administrative and medical applications. The computerised clinics are generally large in terms of number of staff and number of patients, and have been in operation for 3 to 15 years. Specialist clinics have a greater tendency to use computers. The widely used applications in clinics with computers are word processing, accounting, database, medical billing, drugs inventory, laboratory billing and reporting, medical records tracking, and prescription processing. Clinics with computers find: (1) software are generally suitable, (2) objectives of computerisation have been generally achieved, (3) a slight increase in operating costs, (4) a slight increase in staff productivity, and (5) satisfactory vendor support. The responding doctors rate their knowledge of computers from average to poor. Doctors with computers in their clinics hold the perception that: (1) computers can adequately support clinic operations, (2) computer systems are reliable, (3) a genuine need exists for computers in clinics, (4) computers are useful as research tools, and (5) legal and ethical constraints may inhibit use of computers in medical applications. Further analysis of the data has identified some interesting correlations among clinic variables and among doctors' perception variables.