Apparatus and methods for detecting concealed personal security threats may comprise conventional mirrors and less conventional arrays of Hall-effect sensors andor magnetometers, preferably at least two axis or three axis sensors or sensors mounted back-to-back. One approach entails receiving into a digital imaging system, a digital uniform rosette halftone image and a desired resizing factor for that digital uniform rosette halftone image. An information agent service collects the information, and based on various criteria, determines if, when, and how to send and render the information, and to which subscribing client device or devices. Such a configuration allows automatic fabrication of a 3D object of high binding strength without scattering the powder material therearound. Each error amplifier output the voltage difference between the second terminal of the corresponding LED string and a first reference voltage. The major surface absorbers and the corner absorbers may distribute and absorb load applied during a drop event.