We have designed, fabricated, and tested a new type of thermal shear-stress sensor. The sensor consists of a 2 m wide polysilicon thermistor (with a range of lengths, 80-200 m) on a 1.2 m thick silicon-nitride diaphragm, which is on top of a vacuum cavity 200 200 2 m in size. The vacuum cavity provides a good thermal isolation between the resistive element and the substrate; shear-stress sensit...

........................................................................................i Acknowledgements ....................................................................................................... ii Executive Summary .......................................................................................................1 1. Introduction ............................................

The effective potential determines the vacuum state of a quantum field theory. When radiative corrections are included or, if one constructs the finite temperature version of field theory the (effective)potential may have two minimum, one of which is lower than the other. The ’higher’ minimum is referred to as the false or metastable vacuum. The global minimum is the true vacuum state of the th...

We propose a scheme for achieving negative differential thermal conductance in near-field electromagnetic thermal transfer. As an example, we show that the scheme can be implemented with two slabs of silicon carbide brought in close proximity to each other. We also describe how a bistable thermal switch can be constructed in this manner. VC 2012 American Institute of Physics. [doi:10.1063/1.367...

A new structure thermal vacuum sensor with two pn junction diodes, Th-A and Th-B, as a high sensitive temperature sensor working like a thermistor and a micro heater formed on a micro air‒bridge is proposed. The micro air‒bridge is separated into two regions of A and B. The Th-A measures the temperature of the micro-heater formed on the region A and the Th-B does that of the region B which is c...

We calculate the effective Lagrangian for a magnetic field in spinor, scalar and vector QED. Connections are then made to SU(NC) Yang–Mills theory and QCD. The magnetization and the corresponding effective charge are obtained from the effective Lagrangian. The renormalized vacuum magnetization will depend on the renormalization scale chosen. In the absence of any natural scale, it is thus of li...

The authors describe how acoustic phonons can directly tunnel through vacuum and, therefore, transmit energy and conduct heat between bodies that are separated by a vacuum gap. This effect is enabled by introducing a coupling mechanism, such as piezoelectricity, that strongly couples electric field and lattice deformation. The electric field leaks into the vacuum as an evanescent field, which l...

We use matrix model to study thermal phase in bubbling half-BPS type IIB geometries with SO(4) × SO(4) symmetry. In near horizon limit, we find that thermal vacuum of bubbling geometries have disjoint parts, and each part is one phase of thermal system. We connect the thermal dynamics of bubbling geometries with one dimension fermions thermal system. Finally, we try to give a new possible way t...