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3611 results about "Shock wave" patented technology

In physics, a shock wave (also spelled shockwave), or shock, is a type of propagating disturbance that moves faster than the local speed of sound in the medium. Like an ordinary wave, a shock wave carries energy and can propagate through a medium but is characterized by an abrupt, nearly discontinuous, change in pressure, temperature, and density of the medium.

Three-hole transonic speed pressure probe

The invention discloses a three-hole transonic speed pressure probe. As a pneumatic technology develops, a transonic speed air flow appears more and more frequently, for instance, many air flows in an aeroengine reach a transonic speed state, so these transonic speed flow fields need to be measured and analyzed during development of engine components. Conventionally, the transonic speed flow fields are measured respectively by use of a total pressure probe and a direction probe so that total pressure and air flow directions can be obtained. When a flow speed reaches a transonic speed, the probes are under great resistance, and the probes are blown bent easily. When the flow speed reaches an ultrasonic speed, due to the existence of shock waves, there is large total pressure loss, and the influences exerted by the probes on the flow fields are quite large. Though these conventional probes can be used in an ultrasonic air flow, the influences exerted by the probes on the flow fields cannot be neglected, and the requirement for the strength of the probes is quite high. The novel three-hole transonic speed pressure probe provided by the invention is used for measuring the transonic speed flow fields. By use of the probe provided by the invention, the intensity of the shock waves in front of the probe can be weakened during measurement, the influences exerted by the probe on the flow fields are reduced, air-flow total pressure, static pressure, a Mach number and an air-flow deflection angle can be measured simultaneously, the resistance acting on the probe can be effectively reduced, and the firmness and reliability of the probe are guaranteed.

Apparatus and method for macromolecule delivery into living cells

InactiveUS6298264B1Improve efficiencyEasily damagedElectrotherapySurgeryShock waveShock wave lithotripter
This invention discloses an apparatus and method for producing microcavitational activity in aqueous fluids for non-invasive macromolecule delivery into living cells. A standard electrohydraulic shock wave lithotripter is fitted with an adjustable ring reflector that shares the same foci as the standard lithotripter hemi-ellipsoidal reflector. A small portion of the spherical shock wave, generated by the spark discharge at the first focus (F1), is reflected and diffracted by the ring reflector, resulting in a weak preceding shock wave approximately 8.5 mus in front of the lithotripter shock wave reflected and diffracted by the hemi-ellipsoidal reflector. The peak negative pressure of the preceding weak shock wave or pulse at F2 can be adjusted from -0.96 to -1.91 MPa, using an output voltage of 25 kV. Living cells are exposed to the preceding shock wave and the lithotripter shock wave. With optimal pulse combination, the maximum efficiency of shock wave-induced cell membrane permeabilization can be enhanced substantially (up to 91%), by applying to the living cells a low dosage of, for example, 50 shocks. In addition, injury to mouse lymphoid cells is significantly increased at high dosage (up to 50% with shock number >100). The invention thus enables shock wave-inertial microbubble interaction to be used selectively to either enhance the efficiency of shock wave-mediated macromolecule delivery at low dosage or tissue destruction at high dosage.

Edge information-based multi-scale blurred image blind restoration method

The invention discloses an edge information-based multi-scale blurred image blind restoration method, which comprises the following steps of: circularly and gradually restoring an image from a small scale layer to a large scale layer, setting self-adaptive parameters at different scales, and processing each scale layer, namely bilaterally filtering the restored image to obtain an image of which the noise and ripple are removed; performing shock wave filtering to obtain an image with high-strength contrast edges; solving the edges, and combining a fuzzy core initial value and a fuzzy graph to obtain an accurate fuzzy core; restoring a fuzzy image at the current scale to obtain a clear restored image by using the solved fuzzy core; sampling and amplifying in the current scale layer to obtain the restored image and a fuzzy core initial value of an adjacent large scale layer, and performing cycle operation on the adjacent large scale layer. The edge information-based multi-scale blurred image blind restoration method can effectively converge various images in different fuzzy degrees, and compared with a general blind restoration method which directly solves the energy minimization, the blurred image blind restoration method has the advantages of low computational complexity and high noise suppression capacity.
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