Intense Pulsed Light Sintering of CH3NH3PbI3 Solar Cells.

Perovskite solar cells utilizing a two-step deposited CH3NH3PbI3 thin film were rapidly sintered using an intense pulsed light source. For the first time, a heat treatment has shown the capability of sintering methylammonium lead iodide perovskite and creating large crystal sizes approaching 1 μm without sacrificing surface coverage. Solar cells with an average efficiency of 11.

Interferometric null test of a deep parabolic reflector generating a Hertzian dipole field.

We report on interferometric characterization of a deep parabolic mirror with a depth of more than five times its focal length. The interferometer is of Fizeau type; its core consists of the mirror itself, a spherical null element, and a reference flat. Because of the extreme solid angle produced by the paraboloid, the alignment of the setup appears to be very critical and needs auxiliary systems for control.

[The cement free hollow hip prosthesis to reduce intramedullary pressure].

Purpose: A hollow cementless femoral stem has been developed to reduce intramedullary pressure and fat embolism during implantation.

Methods: In a prospective randomized clinical study, cementless hip stems (ALPHA-FIT) were implanted in 42 patients (24 women, 18 men, mean age: 65.9 years).

[Assurance and proof of satisfactory and complete information].

To prevent unjustified blame and claims enforced by patients, is necessary to prove evidence of an indisputable and complete preoperative information. With the help of our developed software it takes little effort to satisfy the given demands.

Long-term results of the Girdlestone hip.

The Girdlestone hip is a possible alternative in cases where reconstruction and reimplantation appear hopeless. Only a minority of the 22 patients we followed for up to 16 years have had results ranging from good to satisfactory.