Shields

About: Shields is a research topic. Over the lifetime, 1456 publications have been published within this topic receiving 10896 citations.

Shielding Effect of Surrounding Buildings on the Lightning-Generated Vertical Electric Field at the Top of a Tall Building

Abstract: We have evaluated the vertical electric field Ez on the roof of a 100-m tall building considering the shielding effect of surrounding buildings (the shields) due to nearby lightning return strokes to flat ground by using the 3-D finite-difference time-domain method. Also, we have investigated the influences on the vertical electric field Ez and corresponding enhancement factors of the following parameters: the distance d between the strike point and the field point; the length l of plan area, the height h , and the conductivity σ of the shields; and the relative position and relative distance rd between the field point and those shields in its vicinity. In general, vertical electric fields and enhancement factors at the field point can be reduced because of the effect of the shields in its vicinity. The effect for the shield located in front of the field point is much stronger than that for the shield located in any other positions. Moreover, the dependence of shielding effect on height h of the shield is stronger than any other parameters such as distance d , relative distance rd , and length l of the shield.

Approximate estimates of the characteristics of propellant ignition using radiant flux through shields with various properties

Abstract: An analytical solution to the problem of propellant ignition using radiant flux is presented in a conjugate statement. The solution generalizes and supplements the results obtained earlier. The cases of ignition through absolutely transparent and opaque shields are considered. Approximate formulas for estimation of the time and temperature of the chemical-reaction onset and the time and temperature of the loss of quasi-stationary equilibrium in different limiting cases are obtained. Estimates of the influence of heat transfer into the environment (by the conductive mechanism) on the ignition characteristics are given. A comparison of the ignition characteristics of the propellant and shields is made.

Magnetic shield for electric induction

Abstract: PURPOSE: To eliminate concentration of leakage flux at split section, by locating upper and lower magnetic shields for upper and lower tanks while shifting the faces at the end. COPYRIGHT: (C)1979,JPO&Japio

Device provided with sensor laminate, shield, and first shield stabilization structure, device provided with sensor laminate, shield, and magnetic layer, device provided with data storge medium, recording head, and arm, and method with step for providing sensor structure and annealing the same

Abstract: PROBLEM TO BE SOLVED: To provide a device including a sensor laminate, a shield, and a first shield stabilization structure.SOLUTION: The device includes sensor laminates (92, 122, 162, 202, 262), first and second shields (94, 96; 124, 126; 164, 166; 204, 206; 264, 266) positioned at a side confronting the sensor laminates, a first shield stabilization structures (102, 132, 172, 212, 268) adjacent to the first shields (94, 124, 164, 204, 264) to apply a bias magnetic field to the first shields. The second shield stabilization structures (186, 234) can be positioned adjacently to the second shields (164, 204).