Active mounts are desirable for isolating spacecraft science instruments from onboard vibrational sources such as motors and release mechanisms. Such active isolation mounts typically employ multilayer piezoelectric actuators to cancel these vibrational disturbances. The actuators selected for spacecraft systems must consume minimal power while exhibiting displacements of 5 to 10 μm under load....

We developed and realized a mechanical integration concept of prism-grating-prism-assembly for the CO2M mission. The design mounts relies on kinematic mounting optical elements. Additional, ultra-light blackened covers stray light disturbance suppression are included. complete assembly was investigated by extensive thermo-mechanical simulations to verify stability under operational, launch load...

The Light Detection and Ranging (LIDAR) is a time-of-flight altimeter instrument being developed for the HERA mission, designated as Planetary ALTimeter (PALT). PALT positioned in center of top face probe, therefore, it cannot use radiators to stabilize its internal temperature. contribution this paper design isostatic bipod mounts LIDAR primary mirror. performance must be maintained over wide ...

Alternated gravel mounts are expected to be a simpler and more cost-efficient alternative traditional river restauration strategies. To improve their stability, two layers of assembled boulders placed like fallen dominoes facing downstream around the triangular shape each mount. Further along both sides channel. The ecological improvements quantified by definition refuge, i.e. anywhere inside f...

Borysko and Sapranauskas (1) and independently Gay (2) have described a method of making coverslip preparations of biological material from which small selected cell groups or single cells may be transferred to methacrylate for sectioning for electron microscopy. In both procedures it is suggested that the selected material viewed under light and phase microscopy be covered with a capsule conta...

In Korea, China, and Taiwan--countries where son preference persists--the availability of prenatal screening techniques and induced abortion has produced an imbalance in the naturally occurring sex ratios of 104-107 male births for every 100 female births. Policy responses to sex-selective abortion were the focus of a 1994 International Symposium on Sex Preference for Children in the Rapidly C...

A method based on the familiar coupling azo dye technique has been devised for the study of enzyme distribution in thick specimens. Its application to the study of esterase distribution in whole tadpoles of Xenopus laevis is described in detail. It can also be used to show the distribution of alkaline phosphatase, both in Xenopus tadpoles and in limbs dissected from chick embryos. It has proved...