Captive nut fastener securely joins brittle materials

Extension tube captive nut with a standard bolt joins assemblies with an inaccessible nut location. This fastener is excellent for joining brittle materials

Noncontacting devices to indicate deflection and vibration of turbopump internal rotating parts

Published report discusses feasibility of ultrasonic techniques; neutron techniques; X-radiography; optical devices; gamma ray devices; and conventional displacement sensors. Use of signal transmitters in place of slip rings indicated possible improvement and will be subject of futher study

Wide channeling beam x‐ray laser

A channeling beam x-ray laser is proposed which is weakly dependent on the channeling length. The scheme is based on applying Bragg reflections to direct the amplified radiation toward a longitudinal cavity direction which is transverse to the beam propagation. This scheme implements a crystal distributed feedback cavity and is restricted to short radiation wavelength of the order of the crystal unit cell dimension