Abstract: An apparatus for cleaning or maintaining the outer side of a hull of a marine vessel or the inner side of a cargo hold of a marine vessel. The apparatus includes a housing provided with a first row of magnetic driving and attachment elements and a second row of magnetic driving and attachment elements. The first and second row being parallel and arranged at opposing lateral sides of the housing. The first row of magnetic driving and attachment elements comprising magnetic wheels and/or a continuous track with magnetic links. The second row of magnetic driving and attachment elements comprising magnetic wheels and/or a continuous track with magnetic links. Further, the apparatus is provided with least one suspended magnetic wheel arranged between the first row and the second row, the at least one suspended magnetic wheel being resiliently suspended from the housing and biased towards the housing.

Abstract: An apparatus for cleaning the outer side of the hull of a marine vessel and for cleaning the wall of cargo holds, the apparatus including a housing provided with magnetic continuous tracks at opposing lateral sides of the housing, a front wheel and a rear wheel for each of the magnetic continuous tracks, each magnetic continuous track including a plurality of links interconnected by drive pins, the links having an inwardly facing side and an outwardly facing side, a guide configured to engage the drive pins for preventing the links in a first portion of the extent of the of at least one of the magnetic continuous tracks between the front wheel and the rear wheel from moving in the direction in which the outwardly facing side faces and a submersible apparatus for cleaning the outer side of the hull of a marine vessel and for cleaning the wall of cargo space in the cargo holds that comprises a watertight housing provided with continuous magnetic tracks at opposing lateral sides of the housing.

Abstract: An apparatus for cleaning the outer side of the hull of a marine vessel and for cleaning the wall of cargo holds, the apparatus including a housing provided with magnetic continuous tracks at opposing lateral sides of the housing, a front wheel and a rear wheel for each of the magnetic continuous tracks, each magnetic continuous track including a plurality of links interconnected by drive pins, the links having an inwardly facing side and an outwardly facing side, a guide configured to engage the drive pins for preventing the links in a first portion of the extent of the of at least one of the magnetic continuous tracks between the front wheel and the rear wheel from moving in the direction in which the outwardly facing side faces and a submersible apparatus for cleaning the outer side of the hull of a marine vessel and for cleaning the wall of cargo space in the cargo holds that comprises a watertight housing provided with continuous magnetic tracks at opposing lateral sides of the housing.

Abstract: An apparatus (1) for cleaning the outer side of the hull (60) of a marine vessel (50) and for cleaning the wall (70) of cargo holds, the apparatus (1) comprising a housing (2) provided with magnetic continuous tracks (3) at opposing lateral sides of the housing (2), a front wheel (6) and a rear wheel (5) for each of the magnetic continuous tracks (3), each magnetic continuous track (3) comprising a plurality of links (9) interconnected by drive pins (10), the links (9) having an inwardly facing side (18) and an outwardly facing side (19), a guide (40) configured to engage the drive pins (10) for preventing the links (9) in a first portion of the extent of the of at least one of the magnetic continuous tracks (3) between the front wheel (6) and the rear wheel (5) from moving in the direction in which the outwardly facing side (19) faces and a submersible apparatus for cleaning the outer side of the hull of a marine vessel and for cleaning the wall of cargo space in the cargo holds that comprises a watertight h

Abstract: An apparatus (1) for cleaning the outer side of the hull (60) of a marine vessel (50) and for cleaning the wall (70) of cargo holds, the apparatus (1) comprising a housing (2) provided with magnetic continuous tracks (3) at opposing lateral sides of the housing (2), a front wheel (6) and a rear wheel (5) for each of the magnetic continuous tracks (3), each magnetic continuous track (3) comprising a plurality of links (9) interconnected by drive pins (10), the links (9) having an inwardly facing side (18) and an outwardly facing side (19), a guide (40) configured to engage the drive pins (10) for preventing the links (9) in a first portion of the extent of the of at least one of the magnetic continuous tracks (3) between the front wheel (6) and the rear wheel (5) from moving in the direction in which the outwardly facing side (19) faces and a submersible apparatus for cleaning the outer side of the hull of a marine vessel and for cleaning the wall of cargo space in the cargo holds that comprises a watertight h

Abstract: A multi-stage centrifugal pump assembly includes at least two impellers (2, 6) and two impeller groups (4, 8) which are consecutive in a flow direction and each with at least one impeller (2, 6). A backflow channel (24) connects an exit side of the first impeller group (4) to an entry side thereof is located in a first impeller group (4) of the two impeller groups (4, 8).

Abstract: A method and system for providing information to a user positioned in a room with two independent listening areas where, in one area, an audio signal is output compensating for the sound from the other area, and where a position between the two areas is indicated to a user. When the user moves about, the position and size of one listening area may change, and the user may be made aware of any conflict with the other listening area. The areas may be defined by boundaries where a compensation quality is at a threshold quality.

Abstract: A method of applying a combined control strategy for the reproduction of multichannel audio signals in two or more sound zones, the method comprising deriving a first cost function for controlling the acoustic potential energy, such as on the basis of the Acoustic Contrast Control method and/or the Energy Difference Maximation method, in the zones to obtain acoustic separation between the zones in terms of sound pressure, deriving a second cost function, such as the Pressure Matching method, controlling the phase of the sound provided in the zones, and where a weight is obtained for determining a combination of the first and second cost functions in a combined optimization.

Abstract: A method of applying a combined control strategy for the reproduction of multichannel audio signals in two or more sound zones, the method comprising deriving a first cost function for controlling the acoustic potential energy, such as on the basis of the Acoustic Contrast Control method and/or the Energy Difference Maximation method, in the zones to obtain acoustic separation between the zones in terms of sound pressure, deriving a second cost function, such as the Pressure Matching method, controlling the phase of the sound provided in the zones, and where a weight is obtained for determining a combination of the first and second cost functions in a combined optimization.

Abstract: A method and system for providing information to a user positioned in a room with two independent listening areas where, in one area, an audio signal is output compensating for the sound from the other area, and where a position between the two areas is indicated to a user. When the user moves about, the position and size of one listening area may change, and the user may be made aware of any conflict with the other listening area. The areas may be defined by boundaries where a compensation quality is at a threshold quality.

Abstract: The invention relates to a sound-emitting device with controllable directivity comprising a plurality of sound sources (7) distributed over the surface of a body 5, each of said sound sources (7) being driven by a separate power amplifier (12), the input terminal of which is provided with the output signal from a corresponding filter (10), such that the frequency response of each individual sound source (7) can be controlled, where each filter (10) is provided with an input signal (11) corresponding to a plurality of input channels Ch1, Ch2 . . . ChN. The body (5) could according to one embodiment of the invention comprise a cylindrical body provided with end pieces (6) at either longitudinal end. The present invention furthermore relates to a method for controlling the individual sound sources of the sound-emitting device in order to obtain a given target directivity.

Abstract: A multi-stage centrifugal pump assembly includes at least two impellers (2, 6) and two impeller groups (4, 8) which are consecutive in a flow direction and each with at least one impeller (2, 6). A backflow channel (24) connects an exit side of the first impeller group (4) to an entry side thereof is located in a first impeller group (4) of the two impeller groups (4, 8).

Abstract: An objective has a front group, a focus group displaceable along the optical axis and a follow-on lens group having a diaphragm. The front group is arranged at the objective end. The lens group having the diaphragm includes at least two composite lenses and/or two positive lenses and/or the back focus can be adjusted. An objective series is presented wherein all objectives of the series have a uniform appearance and/or the diaphragm is arranged in all objectives proceeding from the image plane at the same location.

Abstract: An objective has a front group, a focus group displaceable along the optical axis and a follow-on lens group having a diaphragm. The front group is arranged at the objective end. The lens group having the diaphragm includes at least two composite lenses and/or two positive lenses and/or the back focus can be adjusted. An objective series is presented wherein all objectives of the series have a uniform appearance and/or the diaphragm is arranged in all objectives proceeding from the image plane at the same location.

Abstract: The present invention relates to an image-forming objective which is capable of forming sharp images of objects at at least two different distances from the objective, there being arranged at one focal plane of the objective a corrective element divided into at least two fields in which the refractive power differs between them.

Abstract: This invention relates to a device for use when evaluating optical signals by means of a chopper (2, 2'), i.e. a rotating shutter, and a photodetector (6, 6') for detecting the signal transmitted through the chopper (2, 2'). In order to improve the evaluation of the incident signal the opaque part (3, 3') of the chopper is provided with a reflective surface (7) to utilize also the optical signal falling on the opaque part (3, 3'). An additional photodetector (9, 9') has been arranged for detecting this reflected optical signal. In order to reduce the energy losses and in this way increase the amplification of the optical signal the device also comprises an optical element in the form of a glass prism (10, 10') in which one and the same surface is utilized both for transmitting and reflecting the optical signal.

Abstract: The invention relates to a binocular night telescope of the type which comprises a large aperture objective (1), a light amplifier tube (2) for amplifying the image projected by said large aperture objective and a viewing microscope which comprises telescope objectives (9, 10) and oculars (11, 12) as well as a collimating objective (6) for focusing the amplified image at infinity for an observer. The viewing microscope also comprises prisms or mirrors for erecting the image vertically as well as in side. At least a part of the prisms (7, 8) for erecting the image in side are axially displaced so that they are located at the side of, above or below the light amplifier tube (2) depending on the orientation of the microscope. This means that the entire instrument is shorter and the center of gravity is moved forwards.