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Nonlinear System Identification Techniques and Devices for Discovering Dynamic and Static Tissue Properties

A device for measuring a mechanical property of a tissue includes a probe configured to perturb the tissue with movement relative to a surface of the tissue, an actuator coupled to the probe to move the probe, a detector configured to measure a response of the tissue to the perturbation, and a controller coupled to the actuator and the detector. The controller drives the actuator using a stochastic sequence and determines the mechanical property of the tissue using the measured response received from the detector. The probe can be coupled to the tissue surface. The device can include a reference surface configured to contact the tissue surface. The probe may include a set of interchangeable heads, the set including a head for lateral movement of the probe and a head for perpendicular movement of the probe. The perturbation can include extension of the tissue with the probe or sliding the probe across the tissue surface and may also include indentation of the tissue with the probe. In some embodiments, the actuator includes a Lorentz force linear actuator. The mechanical property may be determined using non-linear stochastic system identification. The mechanical property may be indicative of, for example, tissue compliance and tissue elasticity. The device can further include a handle for manual application of the probe to the surface of the tissue and may include an accelerometer detecting an orientation of the probe. The device can be used to test skin tissue of an animal, plant tissue, such as fruit and vegetables, or any other biological tissue.
Owner:MASSACHUSETTS INST OF TECH

Large automatic ultrasonic dish washing machine

The invention discloses a large automatic ultrasonic dish washing machine. The large automatic ultrasonic dish washing machine comprises an ultrasonic washing tank, an air-drying tank and a collecting tank in sequence from front to back. The ultrasonic washing tank is internally provided with ultrasonic emitting head devices and a driving device, and the driving device is connected with the ultrasonic emitting head devices and used for driving the ultrasonic emitting head devices to work. Each ultrasonic emitting head device comprises an ultrasonic transducer and a high pressure air nozzle which enables input high pressure air to form bubbles in a cleaning fluid, each ultrasonic transducer is used for providing energy for the cleaning fluid, the bubbles in the cleaning fluid are broken to produce an impact force, and the impact force is utilized for washing dishes to be washed. The large automatic ultrasonic dish washing machine is simple and exquisite in structure and is used for washing dishes and the like; the high pressure gas is introduced, the strength of ultrasonic waves produced by the emitting head devices is high, the impact force and friction force of the ultrasonic waves produced by breaking of the bubbles are large, no surfactant or detergent is needed, the effect is good, and environmental protection and sanitation are achieved.
Owner:曾仲林 +1
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