I wish to report here a striking phenomenon that arises in the developing brain of the zebrafish embryo. High-resolution differential interference contrast (DIC) time-lapse video microscopy in the live embryo reveals that throughout the second day of embryogenesis, the nuclei of some of the still-undifferentiated brain cells undergo a sustained spinning behaviour, usually around a constant axis...

The geodesic motion of pseudo-classical spinning particles in Euclidean Taub-NUT space is analysed. The constants of motion are expressed in terms of Killing-Yano tensors. Some previous results from the literature are corrected. PACS number(s): 04.20.Jb, 02.40.-K The con guration space of spinning particles (spinning space) is an supersymmetric extension of an ordinary Riemannian manifold, para...

We report a single-chip probe for “magic angle coil spinning”-MACS nuclear magnetic resonance (NMR) spectroscopy. The probe consists in a wirebonded microcoil integrated with an on-chip interdigitated capacitor. This LC-circuit is resonant at 500 MHz (H Larmor frequency at 11.7 T) enabling wireless inductive coupling of the NMR signal and spinning for high resolution NMR. We demonstrate stable ...

We investigate the motion of a spinning test particle in a spatially-flat FRW-type space-time in the framework of the Einstein-Cartan theory. The space-time has a torsion arising from a spinning fluid filling the space-time. We show that for spinning particles with nonzero transverse spin components, the torsion induces a precession of particle spin around the direction of the fluid spin. We al...

The search of Lagrangians, describing spinning particles, both massive and massless, has a long story. The conventional approach in this direction consists in the extension of the initial spacetime by auxiliary odd/even coordinates which equip a system with spinning degrees of freedom. There is another, less developed approach, where the spinning particle systems are described by the Lagrangian...

Spinning dust appears to be the best explanation for the anomalous emission that has been observed at ∼ 10 − 60 GHz. One of the best examples of spinning dust comes from a HII region in the Perseus molecular cloud. Observations of other HII regions also show tentative evidence for excess emission at frequencies ∼ 30 GHz, although at lower emissivity levels. A new detection of excess emission at...

In this paper, based on MSC Simufact.Forming v16.0 simulation software, the process parameters in multi-pass spinning production of deep cylinders with a large diameter–thickness ratio are optimized, and ten-pass cylinder diameter 500 mm, thickness 2 mm depth 700 is realized. By controlling four mandrel speed, feed rate, wheel fillet radius angle attack, influence force wall deviation formed wo...

Large defect-free domains of a hexagonal packed monolayer silica spheres with the size 4000 µm2 were successfully prepared by dual-speed spin coating. Experimental design and statistical analysis instead traditional ‘changing one separate factor at time’ (COST) approach employed to guide implementation experiments. With its assistance, hexagonal-close-packed (HCP) percentage was elevated 84% in...

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