Abstract: The disclosure provides a unit with a sound isolation/vibration isolation structure, an array employing the same, and a method for fabricating the same. The unit with a sound isolation/vibration isolation structure includes: a hollow frame surrounding an inside space; a film disposed within the inside space, vertically contacting an inside wall of the hollow frame; and a body mass disposed on a top surface of the film. Particularly, the horizontal area of the inside space is larger than the area of the top surface of the film.

Abstract: The security system for a protected object comprises a first wireless module, a central controller, and a remote authorization server. The first wireless module and the central controller are disposed in the protected object. The first wireless module transmits an authorization request with an authorization ID (identification) of the protected object, and receives an authorization response. The central controller is coupled to the first wireless module, and allows the protected object to operate in accordance with the authorization response. The remote authorization server, responsive to the authorization request, generates the authorization response from an authorization record thereof in accordance with the authorization ID, and transmits the authorization response.

Abstract: A security system. The security system for a protected object comprises a first wireless module, a central controller, and a remote authorization server. The first wireless module and the central controller are disposed in the protected object. The first wireless module transmits an authorization request with an authorization ID (identification) of the protected object, and receives an authorization response. The central controller is coupled to the first wireless module, and allows the protected object to operate in accordance with the authorization response. The remote authorization server, responsive to the authorization request, generates the authorization response from an authorization record thereof in accordance with the authorization ID, and transmits the authorization response.

Abstract: A method is described to remove condensible vapors in highly compressed gases without affecting the original particle spectra and concentrations. The vapors are separated from particles primarily through diffusion mechanism and collected on cold surfaces. Four important parameters are the length, the flow rate, the temperature, and the diffusion coefficients of the vapors to be removed. Important applications include sampling particles from high pressure gases and condensible vapor-free filling for ultra-pure cylinder gases.

Abstract: Disclosed is a device for particle sampling from compressed gases. The device allows for anayzing particles from compressed gases of a pressure ranging from 20 psi to 3000 psi. In the device, the formula D.sub.s =D.sub.t .sqroot.(Q.sub.s /Q.sub.t) is applicable wherein D.sub.s and D.sub.t are the probe diameter and the chamber diameter, respectively, Q.sub.s is the sampling flow rate required by monitoring instruments, and Q.sub.t is the total flow rate determined by the orifice diameter and pressure whereby the sampling velocity substantially matches the local flow velocity at the probe. In addition, a distance between the orifice and the probe is greater than L wherein L=D.sub.c / (2 tan .alpha.) where D.sub.c is the chamber diameter and .alpha. is the half angle of jet expansion.

Abstract: A method is disclosed which avoids the formation of droplets by condensation of vapors during the expansion of a highly compressed gas through a critical orifice.The pressure drop is distributed over a sufficient number of critical orifices so as to limit the temperature drop insufficient to initiate droplet formation.One application of the method is pressure reduction of cylinder gases without droplet formation.