Abstract: A method of at least partially deghosting recorded seismic s-waves, wherein recorded seismic data is provided, wherein the recorded seismic data has been recorded at a receiver located beneath the Earth's surface, and wherein the recorded seismic data includes s-wave data. The method may include the steps of finding a model of the Earth's crust for use in deghosting the recorded seismic data using the s-wave data, wherein the model includes at least one region and wherein the model includes the Earth's surface and the location of the receiver, using the model to find a deghosting operator that, when applied to the s-wave data, at least partially deghosts the s-wave data, and applying the deghosting operator to the s-wave data to at least partially deghost the s-wave data.

Abstract: A method of at least partially deghosting recorded seismic s-waves, wherein recorded seismic data is provided, wherein said recorded seismic data has been recorded at a receiver (15) located beneath the Earth's surface (13), and wherein said recorded seismic data comprises s-wave data, the method comprising: finding (3) a model (10) of the Earth's crust for use in deghosting the recorded seismic data using the s-wave data, wherein the model comprises at least one region (11, 12, 16) and wherein the model comprises the Earth's surface (13) and the location of the receiver (15); using (4) said model (10) to find a deghosting operator that, when applied to the s-wave data, at least partially deghosts the s-wave data; and applying (5) the deghosting operator to the s-wave data to at least partially deghost the s-wave data.

Abstract: A gas-driven chest compression apparatus for cardiopulmonary resuscitation (CPR) comprises a flexible pneumatic actuator, capable of axial contraction when fed with a pressurized driving gas, and means for controlling the contraction thereof. Also disclosed are methods of providing chest compressions to a patient by means of a CPR apparatus comprising actuator(s) of this kind, and a corresponding use of the actuator.

Abstract: A gas-driven chest compression apparatus for cardiopulmonary resuscitation (CPR) comprises a flexible pneumatic actuator, capable of axial contraction when fed with a pressurized driving gas, and means for controlling the contraction thereof. Also disclosed are methods of providing chest compressions to a patient by means of a CPR apparatus comprising actuator(s) of this kind, and a corresponding use of the actuator.