Rotational Diode: Clockwise/Counterclockwise Asymmetry in Conducting and Mechanical Properties of Rotating (semi)Conductors

It is difficult to imagine an isolated classical object which possess different moments of inertia when it is uniformly rotated about the same axis with the same angular frequency in opposite, clockwise and counterclockwise, directions. We argue that due to quantum effects, certain (semi-) conductors should exhibit asymmetry in their mechanical and conducting properties with respect to the opposite rotations. We show that a cylinder made of a suitably chosen semiconductor, coated in a metallic film and placed in the magnetic-field background, can serve as a “rotational diode”, which conducts electricity only at a specific range of angular frequencies. The critical angular frequency and the direction of rotation can be tuned with the magnetic field’s strength. Mechanically, the rotational diode possesses different moments of inertia when rotated in clockwise and counterclockwise directions. These effects emerge as a particularity of the Fermi-Dirac statistics of electrons in rotating conductors.

A 3D Classical Object Viewer for Device Compatible Display

The paper presents a 3D Android-based classical object viewer system that improves user experience when viewing 3D datasets. The system is well suited to 3D simulated images and facilitates a more accurate list of images in response to search-based quarries using Android’s SearchView widget. Existing 2D object viewer systems are unable to display the simulated images accurately and older 3D object viewing systems face performance-related challenges. The developed Android system reduces the issues of performance and improves the flexibility in viewing rotation for 3D environments. It also provides better user experience and versatility to 3D object viewers through different paths and channels. The effectiveness of the developed system has been demonstrated using standard datasets.

REMARKS ON GRAVITATIONAL SOURCES

We show that, due to quantum fluctuations of the spacetime metric, any source of observable static gravitational fields is a classical object. We also show that, at the classical level, the gravitational mass of any system of finite volume is equal to its inertial mass in general only after time averaging.