Abstract: A charging system can include a magnet. The ring charging system also can include a band. The band can include a housing configured to be worn by a user. The band also can include a power source located in or at the housing. The band further can include a charging circuit including an induction coil located in or at the housing. The charging circuit can be configured to charge the power source by way of electrical energy generated by a change in magnetic flux from the magnet through the induction coil. The housing can be configured to move relative to the magnet when actuated by a user motion such that moving the housing relative to the magnet causes the change in the magnetic flux. Other embodiments are disclosed.

Abstract: Provided is a method for repairing a root of a rotor blade of a wind turbine, the root including several bores for receiving a bolt and extending form the root front surface into the blade, wherein at least a part of the front surface blade material surrounding the bore is removed using a removing tool and that at least one shim plate is attached to the processed front surface surrounding the bore.

Abstract: A computer-implemented system and method for converting the resistances of an array of metal oxide sensors into constituents and concentrations of a multi-component gas provided around the sensor array. The method includes preprocessing the resistances of the sensor array; selecting a model that calculates the constituents and concentrations of the multi-component gas based on the preprocessed resistances; and post-processing the constituents and concentrations of the multi-component gas generated by the selected model to provide the actual constituents and concentrations of the multi-component gas.