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  • Publication number: 20100169038
    Abstract: The present invention provides processes employing algorithms and methods for calculating particle size distribution. In particular, the present invention provides processes employing algorithms and methods for calculating particle size distribution of different particle shapes from chord length distributions.
    Type: Application
    Filed: April 23, 2008
    Publication date: July 1, 2010
    Applicant: TUFTS UNIVERSITY
    Inventors: Christos Georgakis, Sze Wing Wong
  • Publication number: 20150001812
    Abstract: An improved labyrinth seal is described with the seal including a group of several fins forming circumferential barriers against the flow of a working fluid between stationary and rotating parts in a turbine, wherein within the group the volume between the penultimate fin and the last fin is altered compared to the average volume between other adjacent fins of the group.
    Type: Application
    Filed: September 18, 2014
    Publication date: January 1, 2015
    Inventors: Vasileios STEFANIS, Christos GEORGAKIS
  • Patent number: 9234434
    Abstract: An improved labyrinth seal is described with the seal including a group of several fins forming circumferential barriers against the flow of a working fluid between stationary and rotating parts in a turbine, wherein within the group the volume between the penultimate fin and the last fin is altered compared to the average volume between other adjacent fins of the group.
    Type: Grant
    Filed: September 18, 2014
    Date of Patent: January 12, 2016
    Assignee: ALSTOM Technology Ltd
    Inventors: Vasileios Stefanis, Christos Georgakis
  • Publication number: 20120025472
    Abstract: A labyrinth seal has a plurality of arcuate labyrinth seal segments 14 in which the confronting ends of adjacent arcuate labyrinth seal segments 14 have planar faces 26 which are oriented radially and axially but which are canted away from a strictly axial orientation 28 by a cant angle. A plurality of arcuate brush seal segments 16 may be retained in the plurality of arcuate labyrinth seal segments 14, thereby forming a combined labyrinth and brush seal.
    Type: Application
    Filed: May 19, 2011
    Publication date: February 2, 2012
    Inventors: Wilhelm Reiter, Christos Georgakis, Ivan Ramirez, Venkatesan Palaniappan
  • Publication number: 20150102566
    Abstract: The invention relates to a seal between static components of a turbine. The seal includes at least one middle piece, which has at its opposite ends end pieces. The end pieces are arranged in a respective groove of the static components and adjoining the inside surfaces of the grooves. The middle piece has at least two parts. The middle piece parts are rotatably coupled to one another via a pivot. The pivot is an annular ring in cross section formed by at least two cylinder elements being coaxially interfitted and slidable relative to each other. The inner surface of the pivot is wrapped with metallic cloth material. Advantages of the invention are higher flexibility due to the pivoting to accommodate larger relative movements of the turbine components and reduced wear with aging while maintaining good sealing performance.
    Type: Application
    Filed: December 18, 2014
    Publication date: April 16, 2015
    Inventors: Hariharan HANUMANTHAN, Christos GEORGAKIS
  • Patent number: 9341072
    Abstract: The invention relates to a seal between static components of a turbine. The seal includes at least one middle piece, which has at its opposite ends end pieces. The end pieces are arranged in a respective groove of the static components and adjoining the inside surfaces of the grooves. The middle piece has at least two parts. The middle piece parts are rotatably coupled to one another via a pivot. The pivot is an annular ring in cross section formed by at least two cylinder elements being coaxially interfitted and slidable relative to each other. The inner surface of the pivot is wrapped with metallic cloth material. Advantages of the invention are higher flexibility due to the pivoting to accommodate larger relative movements of the turbine components and reduced wear with aging while maintaining good sealing performance.
    Type: Grant
    Filed: December 18, 2014
    Date of Patent: May 17, 2016
    Assignee: GENERAL ELECTRIC TECHNOLOGY GMBH
    Inventors: Hariharan Hanumanthan, Christos Georgakis
  • Publication number: 20090049767
    Abstract: A tuned liquid damper comprising a housing with a hollow cavity within said housing and a first fluid which partially fills said hollow cavity. The inner surface of said hollow cavity is essentially spherical. The tuned liquid damper further comprises first fluid damping means arranged within the essentially spherical cavity of the housing. In this way, a tuned liquid damper is provided which has a response which is constant and independent of the orientation of the tuned liquid damper. Damping means are provided in order to be able to control the damping effect of the tuned liquid damper.
    Type: Application
    Filed: February 15, 2007
    Publication date: February 26, 2009
    Applicant: DTU, TECHNICAL UNIVERSITY OF DENMARK
    Inventor: Christos T. Georgakis
  • Patent number: 7971397
    Abstract: A tuned liquid damper comprising a housing with a hollow cavity within said housing and a first fluid which partially fills said hollow cavity. The inner surface of said hollow cavity is essentially spherical. The tuned liquid damper further comprises first fluid damping means arranged within the essentially spherical cavity of the housing. In this way, a tuned liquid damper is provided which has a response which is constant and independent of the orientation of the tuned liquid damper. Damping means are provided in order to be able to control the damping effect of the tuned liquid damper.
    Type: Grant
    Filed: February 15, 2007
    Date of Patent: July 5, 2011
    Assignee: DTU, Technical University of Denmark
    Inventor: Christos T. Georgakis
  • Publication number: 20150152611
    Abstract: The invention provides a construction comprising a structural element and at least one cable (100) arranged in tension to carry at least a part of the weight of the structural element. The cable defines an outer surface (102) onto which a plurality of strakes (104) form protrusions for reducing rain and wind induced vibrations. Each strake has a height being a distance from a strake root part connected to the outer surface of the cable and a strake end part terminating the strake outwards form the cable, a width being transverse to the height, and a length transverse to the height and width and along which length the strake is connected to the cable. The length of each strake is shorter than the circumference of the outer surface, and the height is less than 5 percent of the diameter of the cable.
    Type: Application
    Filed: June 28, 2013
    Publication date: June 4, 2015
    Inventors: Christos Thomas Georgakis, Kenneth Kleissl
  • Patent number: 9476172
    Abstract: The invention provides a construction comprising a structural element and at least one cable (100) arranged in tension to carry at least a part of the weight of the structural element. The cable defines an outer surface (102) onto which a plurality of strakes (104) form protrusions for reducing rain and wind induced vibrations. Each strake has a height being a distance from a strake root part connected to the outer surface of the cable and a strake end part terminating the strake outwards form the cable, a width being transverse to the height, and a length transverse to the height and width and along which length the strake is connected to the cable. The length of each strake is shorter than the circumference of the outer surface, and the height is less than 5 percent of the diameter of the cable.
    Type: Grant
    Filed: June 28, 2013
    Date of Patent: October 25, 2016
    Assignee: Danmarks Tekniske Universitet
    Inventors: Christos Thomas Georgakis, Kenneth Kleissl
  • Publication number: 20150152610
    Abstract: The invention provides a construction comprising a structural element and at least one cable (101) arranged in tension to carry at least a part of the weight of the structural element. The cable defines an outer surface (102) onto which at least one strake (104) forms a protrusion for reducing rain and wind induced vibrations. The strake has a height being a distance from a strake root part connected to the outer surface of the cable and a strake end part terminating the strake outwards away from the cable, and the strake has a width being transverse to the height, the width decreasing in the direction from the strake root part towards the strake end part. The height is less than 5 percent of the diameter of the cable. Furthermore, the strake comprises a first strake surface portion facing away from the cable, which first strake surface portion is concave or straight.
    Type: Application
    Filed: June 28, 2013
    Publication date: June 4, 2015
    Inventors: Christos Thomas Georgakis, Kenneth Kleissl
  • Patent number: 9476171
    Abstract: The invention provides a construction comprising a structural element and at least one cable (101) arranged in tension to carry at least a part of the weight of the structural element. The cable defines an outer surface (102) onto which at least one strake (104) forms a protrusion for reducing rain and wind induced vibrations. The strake has a height being a distance from a strake root part connected to the outer surface of the cable and a strake end part terminating the strake outwards away from the cable, and the strake has a width being transverse to the height, the width decreasing in the direction from the strake root part towards the strake end part. The height is less than 5 percent of the diameter of the cable. Furthermore, the strake comprises a first strake surface portion facing away from the cable, which first strake surface portion is concave or straight.
    Type: Grant
    Filed: June 28, 2013
    Date of Patent: October 25, 2016
    Assignee: Danmarks Tekniske Universitet
    Inventors: Christos Thomas Georgakis, Kenneth Kleissl
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