Abstract: A flow velocity meter is disclosed. The flow velocity meter utilizes a phase locked loop to generate an output signal and outputs the output signal to a current under test. The flow velocity meter receives a reflection signal from the current under test to calculate a speed of the current under test according to a reflection signal and a frequency difference between the output signal and the reflection signal. The flow velocity meter further includes an inclinometer for measuring a depression angle between a water level and a normal direction of the flow velocity meter and measuring a horizontal angle. The flow velocity meter can be adjusted its orientation when being installed according to the measured angles.

Abstract: A flow velocity meter is disclosed. The flow velocity meter utilizes a phase locked loop to generate an output signal and outputs the output signal to a current under test. The flow velocity meter receives a reflection signal from the current under test to calculate a speed of the current under test according to a reflection signal and a frequency difference between the output signal and the reflection signal. The flow velocity meter further includes an inclinometer for measuring a depression angle between a water level and a normal direction of the flow velocity meter and measuring a horizontal angle. The flow velocity meter can be adjusted its orientation when being installed according to the measured angles.

Abstract: A method for enhancing attention and concentration includes a step of preparing a target of different purposes; a step of choosing one of the purposes of the target; a step of watching the target; a step of blocking the sight between the tester and the target, and a step of moving tester's limbs to complete commands of the target.

Abstract: A method for measuring suspended sediment concentration (SSC) in water includes the steps of: placing a vibrating-type SSC measuring probe in a target water body whose SSC is to be measured, and causing the SSC measuring probe to vibrate; measuring a vibratory signal resulting from the vibration of the SSC measuring probe, and obtaining a vibration response of the SSC measuring probe according to the vibratory signal; and obtaining the SSC of the target water body based upon the vibration response and a pre-established relationship between vibration responses of the SSC measuring probe to various known SSCs.