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"I really believe that true PD happens in small chunks. That's what social networks like Twitter and Plurk and Ning provide - small bits of real feedback, right there at the exact right time. Teachers have always talked and shared their ideas in the hallways of their school between classes. Well, now those hallways have gone online," says Lori Reed, a 20-year veteran third-grade teacher from Kress Independent School District in Kress, Texas. Social networking, she adds, connects her to people and resources that help her do her job better.

Magnetic sensors and their related testing technologies are very important components and application technologies to ensure the installation, commissioning and operation of automatic production lines.

The information feedback of the spraying robot control system comes from the signal detection of the sensor. Sensors in the spraying robot are used to reflect the actual motion state of the spraying machine.

In food processing, new automation technologies and robotic solutions are becoming a new production force. Whether it is the frequent sorting and packaging and the handling and stacking of goods with strong physical labor, robots play a unique role.