Analiză privind factura pentru materia primă (BOM) Jobs

I need an engineer to produce a design-only blueprint and bill of materials for a small, remotely controlled rover that moves inside a tank of mineral oil. My team will build it. The challenge: it must move in oil without creating bubbles or disturbing the oil. That means no exposed propellers, and no air or other fluid entering the oil. Buoyancy alone only moves it up and down, so I want your recommendation for controlled sideways movement and position holding. My idea is about 6 enclosed, ducted thrusters on a rounded hull, but I'm open to better. Targets (confirm or challenge with calculations): Size: 20 × 20 × 23 cm maximum Mass: 3.0 kg or less including payload (bare rover 2.2 kg, about 0.6 kg reserved for future sensors) Oil: 5–40 cSt, 5–70°C; rate...

I’m building an energy-healing device whose sole aim is spiritual alignment through chakra balancing. The unit should actively address every major chakra—from root to crown—so the final design must deliver a complete, harmonious energy profile rather than targeting a single centre. Here is what I need from you: • A clear concept explaining the working principle (light, sound, frequency, crystals, PEMF—or a smart combination) and why it benefits all seven chakras. • Detailed technical drawings or schematics, a bill of materials, and component justification. If you lean on specific frequencies, list them and show how they map to each chakra. • A prototype plan—including housing, power supply, safety considerations, and simple user controls fo...