EEG and MEG Fundamentals: Brain Imaging Principles
EEG and MEG Hardware & Sensors
- EEG: Measures electrical potential (voltage) differences on the scalp, originating from secondary/volume currents in the extracellular space. Uses electrodes (e.g., Ag/AgCl) that convert ionic flow to electrical current. Requires a reference electrode. Signal significantly smeared/distorted by low conductivity skull. Sensitive to both radial and tangential sources. Standardized placement (e.g., 10-20 system) ensures replicability.
- MEG: Measures magnetic fields outside
Automotive Sealants: Choosing & Applying for Car Bodywork
Automotive Sealants: Essential for Vehicle Repair
Sealants are crucial for ensuring the quality of vehicle repairs and maintaining anti-corrosion warranties. They serve various roles, including anti-gravel protection and soundproofing for wheel wells, floors, and other areas.
Types of Automotive Sealants
Extrudable Joint Sealants
Used when working with sheet metal, applied to all joints or seams. Application is typically done using a polyurethane cartridge with a manual or pneumatic gun. Polyurethane
Advanced Retort Packaging Solutions for Food
Plastic Retort Containers
Retort packaging encompasses various forms designed for sterilization, including:
- Flexible retort pouches
- Rolled Aluminum/PE trays
- Semi-rigid trays
- Thermoformed trays with lids
- Tubs with double-locking metal lids
- Complex cardboard boxes
Flexible Retort Pouch Characteristics
Compared to conventional packaging, flexible retort pouches offer distinct advantages due to their flat cross-section and reduced product thickness:
- Rapid heat transfer, leading to reduced sterilization time.
- Improved
Hydraulic & Pneumatic Cylinder Control: Operation, Speed, and Pressure
Single-Acting Cylinder Operation
When the cylinder valve is activated, the piston extends. It remains extended as long as the valve is active. When the valve is deactivated, the piston retracts. Valves can also be bistable, meaning that activating one control signal maintains a position until a different control signal is activated. Monostable valves can also be interlocked to maintain a given position indefinitely.
Double-Acting Cylinder Operation
When control signal 1.1 is activated, the plunger
Read MoreAdvanced Engine Valve & Timing Technologies
Multivalve Engine Design Principles
Multivalve distribution involves doubling the number of valves to reduce the diameter of each valve and effectively utilize available space in the combustion chamber. Valves are typically angled between 20° and 50°, allowing for a compact combustion chamber design with a very favorable surface-to-volume ratio. This design can easily induce significant turbulence, leading to better utilization of heat energy and a positive impact on fuel consumption.
Advantages
Read MorePress Tooling Essentials: Design, Operations & Safety
Limitations of Press Tool Usage
High Initial Cost: The design and manufacture of press tools involve significant capital investment.
Limited Flexibility: Press tools are generally designed for specific parts, making them unsuitable for small batch production or frequent design changes.
Tool Wear and Maintenance: Press tools experience wear and tear and require regular maintenance and sharpening.
Material Restrictions: Only materials with suitable ductility and thickness can be processed effectively.