Summary: In engineering, the transition from idea to product requires that the engineer produce clear proposals demonstrating the idea's practicality and economic feasibility. Smelser describes how writing is a key element in this process. Engineers don't need to know how to write.
Cradle to gate Cradle to gate is a boundary condition associated with embodied carbon, carbon footprint and LCA studies. A study to these boundaries considers all activities starting with the extraction of materials from the earth (the cradle), their transportation, refining, processing and fabrication activities until the material or product is ready to leave the factory gate.
1. Difference between slab doors and pre-hung doors. A slab door is just that: a door. It doesn't come with a handle, hinges or a latch. It can be hollow core or solid wood, and it is the responsibility of the homeowner or installer to choose the proper hardware and mount it correctly. Slab doors offer essentially a blank slate: Everything but the door type is malleable. RELATED: 5 Tips for Replacing Interior Doors. Pre-hung doors come with the frame already attached to a slab, as well as hardware and hinges. The door could be opened and closed if it's propped up â but this is a bad idea.