Three new molecular cages-a trigonal prism (2) and two cubic-shaped boxes of increasing size (3, 4)-featuring as many as 10 porphyrins were obtained in quantitative yields by self-assembly of a single bis-zincporphyrin metallacycle (1) with appropriate polytopic N-linkers: the trigonal planar tpt or the cruciform porphyrins 4'-TPyP and 4'-TPhPyP.

Abstract. The design of new lightweight and dexterous configurations is a major research focus for continuum robotics. This work proposes cruciform robot. Its unique feature that it formed by multiple cruciform-arranged elastic sheets with single dimension motion connected in series, thus has low-coupling characteristics. In addition, the robot advantages lighter weight (65 g), better dexterity...

M I S S I L E S When Fieseler’s engineers perfected the V-1 ‘doodlebug’ in 1944, little could they have imagined the long term impact of their creativity. The V-1 became the forerunner of a family of weapons which has decisively infl uenced many aspects of modern air warfare since then, and will continue to do so for the foreseeable future. The media defi nition of a cruise missile is any weapo...

Advanced missiles employ multiple actuators to enhance maneuverability and to improve the intercept probability against highly maneuverable targets. Actuators employed in such missiles include aerodynamic control surfaces and reaction jets. While the usage of aerodynamic surfaces are not generally constrained, reaction jet usage has to be minimized due to the limited amount of fuel available on...

A multiaxis thrust-vectoring nozzle designed to have equal ow-turning capability in pitch and yaw was conceived and experimentally tested for internal static performance at Langley Research Center. The cruciform-shaped, convergent-divergent nozzle turned the ow for thrust vectoring by deeecting the divergent surfaces of the nozzle, called aps. Methods for eliminating physical interference betwe...

Virtually all models for recombination between homologous DNA sequences invoke a branched intermediate known as a Holliday structure. The terminal steps of recombination are postulated to involve a specific cleavage through the four-way junction of a Holliday structure, in a process known as resolution. We have constructed a synthetic Holliday structure in which the position of the junction of ...