Abstract The structure of five rare filigree spheres from a seventeenth century shipwreck was examined in order to unravel their condition, manufacturing process and function. This study focuses on the application non-invasive imaging techniques: optical microscopy, X-radiography, X-ray micro-computed tomography neutron computed tomography. A valuation different aspects applied techniques made,...

The MIT Space Systems Laboratory is developing the SPHERES formation flight testbed to provide the Air Force and NASA with a long term, replenishable, and upgradable testbed for the validation of high risk metrology, control, and autonomy technologies. These technologies are critical to the operation of distributed satellite and docking missions such as TechSat21, Starlight, Terrestrial Planet ...

Microcavities such as spheres or rings are resonant optical sensors which support whispering gallery modes (WGMs). In recent years WGM based sensors have been continuously improved with respect to sensitivity and detection limit. The conventional method to measure physical as well as biological quantities using WGMs is to record the resonance shift of a single resonator. To ensure high sensitiv...

In this study, cellulose extracted from the factory waste poplar was converted into value-added carbon spheres by means of hydrothermal carbonization (HTC). Oxygen-rich functional group with smooth morphology, good dispersibility, controllable particle size, high content, and calorific value were prepared under various process conditions. The optimum conditions for obtaining shape temperature 2...

Self-propelled particles can exhibit surprising non-equilibrium behaviors, and how they interact with obstacles or boundaries remains an important open problem. Here we show that chemically propelled micro-rods can be captured, with little change in their speed, into close orbits around solid spheres resting on or near a horizontal plane. We show that this interaction between sphere and particl...

Eukaryotic cells move through the complex micro-environment of a tissue either by attaching to the extracellular matrix – sometimes degrading it locally – and pulling themselves along, or by squeezing through the matrix by appropriate sequences of shape changes. Some cells can even swim by shape changes, and one mode used is called blebbing, in which a cell creates a small hemispherical protrus...