A 3D image is created by using two digital projectors having overlapping projection regions. The plunger includes a first surface with a seal situated at an edge of the surface. To provide a resource efficient and aesthetically pleasing transition, the electronic device can pre-render the interface in the final orientation, and define an animation by cross-fading the interface between the initial and final interfaces. Use of relatively rigid caulking and the low-resistance joint provides a vibration-resistant shielded connection structure suitable for long-lived use in an applications such as a connection for an electric motor in a vehicle. In one embodiment the roof vent and shear element is installed as a part of the roof wood sheathing diaphragm and then may have any number of roof ridge vent products on the market installed over it as with asphalt composition shingle systems. Particularly, sugar chains are introduced into native hTPO by substituting amino acids such as asparagine for amino acids at specific positions in native hTPO, preparing novel hTPO derivatives with high activities enhancing the platelet production in vivo.