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Rockbursts occur frequently and cause serious damage in deep tunnels. Microseismic (MS) source location is of great importance and forms the foundation of the MS monitoring technology used in tunnel rockburst hazard mechanism analysis. A highly accurate method for locating MS events that occur during rockburst development in tunnels is proposed here. An anisotropic velocity model, rockburst event...
This digest paper describes experimental demonstration of high-frequency silicon carbide (SiC) microdisk resonators operating in aquatic environments, including water and water solutions of H2O2 and NH4OH. We demonstrate, for the first time, that center-clamped circular SiC microdisks can preserve multiple robust flexural-mode resonances in water. We have observed strong multimode responses in the...
We describe the first experimental investigation of pressure-dependent resonant motions in high-frequency circular drumhead resonators based on atomically-thin molybdenum disulfide (MoS2), which demonstrate attractive performance and potential for pressure sensing. Circular bilayer and trilayer MoS2 membrane resonators with diameter of ∼1.8μm are studied in the pressure range of ∼10mTorr to ∼400Torr...
Silicon carbide (SiC) is a leading material for both semiconductor devices and harsh environment micro- and nano-electromechanical systems (MEMS/NEMS) due to a combination of exceptional electrical, mechanical and chemical properties. SiC is also an excellent structural material for micromechanical transducers because of its high Young's modulus and mechanical strength. Suspended thin film diaphragms...
This paper presents on-demand microbeads delivery system in a microfluidic chip by magnetically driven microtool (MMT). The four of horizontally arranged permanent magnets and the piezoelectric vibrator are used to actuate the Ni based microtool precisely in the chip. The MMT injects the beads mechanically to flow and then into ejection operation part. We succeeded in transferring microbeads one by...
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