In order to manufacture smaller and more efficient electric motors an accurate prediction of the motor thermal performances at the design stage is a necessity. In addition, the thermal performance often needs to be analyzed when a motor is used in a different way to which it was originally designed for. An important example is the use of variable speed drives with induction motors designed for ...

Millimeter-wave thermal analysis instrumentation is being developed for characterization of high temperature materials required for diverse fuel and structural needs in extreme high temperature reactor environments. A two-receiver 137 GHz system with orthogonal polarizations for anisotropic properties resolution has been implemented at MIT and is being tested with graphite and silicon carbide s...

Thus far we have examined how to calculate the power radiated from an antenna and, using the Friis transmission formula, how to calculate the received power at the other end of a communication link. However, the received signal power is meaningless unless compared with the power received from unwanted sources over the same bandwidth. Such noise sources include thermal radiation from the earth a...

Overview Control systems for heliostat fields are designed to accurately direct sunlight at a specific target. They track the sun’s movement across the sky while simultaneously correcting for wind, foundation shifting and thermal expansion. In addition, control systems monitor and adjust the amount of thermal power reaching the receiver. The receiver converting solar heat into power needs to op...

The current status and needs of thermal biology and physiol ogy as related to clinical hyperthermia are summarized. Empha sis is placed on heat-induced modification of blood flow and microenvironment in tissues, on the biological effects of heat and X-rays, and on the relationship between drug resistance, heat resistance, and thermotolerance in thermochemotherapy. Re sults from recent studies i...

Recently launched x-ray telescopes have discovered several candidate isolated neutron stars. The thermal radiation from these objects may potentially constrain our understanding of nuclear physics in a realm inaccessible to terrestrial experiments. To translate the observed fluxes from neutron stars into constraints, one needs precise calculations of the heat transfer through the thin insulatin...

The current status and needs of thermal biology and physiology as related to clinical hyperthermia are summarized. Emphasis is placed on heat-induced modification of blood flow and microenvironment in tissues, on the biological effects of heat and X-rays, and on the relationship between drug resistance, heat resistance, and thermotolerance in thermochemotherapy. Results from recent studies inve...

The determination of the thermal comfort indices needs the evaluating devices. The physical measured parameters of the milieu input in this device. We measure air temperature of the area, temperature of the surfaces of walls, floor and the ceiling –medium radiant temperature, air flow velocity and air moisture. Other parameters are the date of his clothes and his physical activity. Outputs of t...

For reasonable accuracy in thermal transient FEA, two related, but distinct, goals must be simultaneously attained: (1) the mesh must have sufficient intrinsic temporal and spatial resolution for the problem of interest; (2) the time steps must be sized to yield proper mathematical transient behavior for that mesh. If the distinction between these needs is not fully grasped, or either point sim...

We present a useful framework within which we can understand some of the physical phenomena that drive thermal emission in one-dimensional periodic metallic photonic crystals, emphasizing phenomenology and physical intuition. We perform detailed numerical calculations for these systems and find that polarization and periodicity play key roles in determining the types of physical phenomena that ...