PBS21 天
Crash Course Zoology: Episode 3: Diversity of Bodies & Sizes (but mostly crabs)
Let’s go to the Thought Bubble. It all started with the cycloids, a group of arthropods that lived from the Carboniferous to the Cretaceous era. They had that flat crabby shape, a small abdomen ...
C&EN27 天
Minimizing Sensor-Sample Distances in Scanning Nitrogen-Vacancy Magnetometry
Department of Physics, ETH Zürich, Otto Stern Weg 1, 8093 Zürich, Switzerland ...
Scientific Research Publishing22 天
Schuler, R. (2008). Moving Staircase.
ABSTRACT: Escalators (moving stairways) are machines which belong to the group of continuous conveying machines according to their principle of operation, but at the same time they are, together with ...