Abstract: The invention concerns a rotor blade of a wind power installation, comprising a rotor blade root (4) for attachment of the rotor blade to a rotor hub and a rotor blade tip arranged at a side remote from the rotor blade root, as well as a wind power installation having such rotor blades. In that arrangement a relative profile thickness which is defined as the ratio of profile thickness to profile depth has a local maximum in a central region between rotor blade root and rotor blade tip.

Abstract: The present invention relates to a method for operating a wind turbine having a rotor with rotor blades and an essentially horizontal rotation axis for generating electrical energy from wind energy. According to the invention, it is proposed for the wind turbine to be aligned such that the azimuth position of the wind turbine departs by an azimuth adjustment angle from an alignment into the wind, and/or that the blade angle of the rotor blades is adjusted in cyclic rotation such as to reduce alternating loads that are caused by a height profile of the wind.

Abstract: The invention relates to a Magnus rotor having a cylindrical body of revolution for converting wind power into a feed force using the Magnus effect. The Magnus rotor having: a rotational shaft about which the body of revolution rotates; a support member on which the body of revolution is mounted; and a body of revolution which has stiffening ribs for the reinforcement thereof. The body of revolution is primed in at least two planes arranged at a mutual spacing in the axial direction perpendicular to the rotational shaft of the body of revolution in order to accommodate balancing weights. The invention further relates to a method for balancing a body of revolution according to the invention.

Abstract: The invention concerns a rotor blade of a wind power installation, comprising a rotor blade root for attachment of the rotor blade to a rotor hub and a rotor blade tip arranged at a side remote from the rotor blade root, as well as a wind power installation having such rotor blades. In that arrangement a relative profile thickness which is defined as the ratio of profile thickness to profile depth has a local maximum in a central region between rotor blade root and rotor blade tip.

Abstract: The present disclosure is related to apparatuses and methods for downhole acoustic logging. The tool may be used for generating a guided borehole wave that propagates into the formation as a body wave, reflects from an interface, and is converted back into a guided borehole wave. Guided borehole waves resulting from reflection of the body wave are used to image a reflector. Methods may include processing of acoustic logging signals including: wavefield separation, auto-correlation of wavefield components, filtering using a dip filter, and estimating a distance to the reflective interface.

Abstract: The invention relates to a Magnus rotor comprising a cylindrical body of revolution for converting wind power into a feed force using the Magnus effect. The Magnus rotor comprises: a rotational shaft about which the body of revolution rotates; a support member on which the body of revolution is mounted; and a body of revolution which has means for the reinforcement thereof. The body of revolution is primed in at least two planes arranged at a mutual spacing in the axial direction perpendicular to the rotational shaft of the body of revolution in order to accommodate balancing weights. The invention further relates to a method for balancing a body of revolution according to the invention.

Abstract: The present disclosure is related to apparatuses and methods for downhole acoustic logging. The tool may be used for generating a guided borehole wave that propagates into the formation as a body wave, reflects from an interface, and is converted back into a a guided borehole wave. Guided borehole waves resulting from reflection of the body wave are used to image a reflector. Methods may include processing of acoustic logging signals including: wavefield separation, auto-correlation of wavefield components, filtering using a dip filter, and estimating a distance to the reflective interface.

Abstract: A downhole acoustic logging tool is used for generating a guided borehole wave that propagates into the formation as a body wave, reflects from an interface and is converted back into a guided borehole wave. Guided borehole waves resulting from reflection of the body wave are used to image a reflector.

Abstract: Resonance scattering analysis of at least 3-component (3-C) VSP data detects heterogeneities in the proximity of a borehole. A method for seismic exploration of a pre-determined volume of the earth for assessing features of the volume using at least 3-C VSP data generated for the volume comprises: computing a resonance spectra indicating resonance scattering of the at least 3-C VSP data; and determining a lateral continuity of said features in accordance with the resonance spectra. Zero amplitude in a resonance spectrum indicates definite polarization of the direct pressure wave into the ray direction and very weak lateral heterogeneity along the path of the direct wave. High amplitudes in a resonance spectrum are observed if energy of the direct wave is observed on the horizontal components due to scattering at small-scale lateral heterogeneities near the receiver. Peak frequency provides information on the size and location of the scattering structure.

Abstract: A downhole acoustic logging tool is used for generating a guided borehole wave that propagates into the formation as a body wave, reflects from an interface and is converted back into a guided borehole wave. Guided borehole waves resulting from reflection of the body wave are used to image a reflector.

Abstract: Resonance scattering analysis of at least 3-component (3-C) VSP data detects heterogeneities in the proximity of a borehole. A method for seismic exploration of a pre-determined volume of the earth for assessing features of the volume using at least 3-C VSP data generated for the volume comprises: computing a resonance spectra indicating resonance scattering of the at least 3-C VSP data; and determining a lateral continuity of said features in accordance with the resonance spectra. Zero amplitude in a resonance spectrum indicates definite polarization of the direct pressure wave into the ray direction and very weak lateral heterogeneity along the path of the direct wave. High amplitudes in a resonance spectrum are observed if energy of the direct wave is observed on the horizontal components due to scattering at small-scale lateral heterogeneities near the receiver. Peak frequency provides information on the size and location of the scattering structure.