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    Control of flow networks
    11.
    发明授权
    Control of flow networks 有权

    公开(公告)号：US09946234B2

    公开(公告)日：2018-04-17

    申请号：US14780882

    申请日：2014-04-17

    Applicant: NORWEGIAN UNIVERSITY OF SCIENCE AND TECHNOLOGY (NTNU)

    Inventor： Bjarne Foss ,  Vidar Gunnerud

    IPC: G05B13/04 ,  E21B41/00 ,  E21B43/34 ,  E21B43/00

    CPC classification number: G05B13/041 ,  E21B41/00 ,  E21B43/00 ,  E21B43/34

    Abstract: A method for control of a flow network in order to improve the performance of the flow network comprises: (a) applying predetermined excitations at multiple control points within the flow network, wherein the multiple control points are at different branches of the flow network; (b) receiving measurements of changes in one or more flow parameter(s) in one or more flow path(s) in which flows of more than one of the different branches have been combined; (c) carrying out an analysis of the flow parameter measurements to identify variations induced by the applied excitations; (d) determining an adjustment to be made at one or more of the control point(s) in order to improve the performance of the flow network, for example by building and solving an optimization model; (e) making the determined adjustment to the control point(s) of the flow network or making an alternative adjustment decided upon by the flow network operator; and (f) repeating steps (a) to (e) one or more times to thereby iteratively improve the performance of the flow network.

    CODING IN GALOIS FIELDS WITH REDUCED COMPLEXITY
    12.
    发明申请
    CODING IN GALOIS FIELDS WITH REDUCED COMPLEXITY 审中-公开

    公开(公告)号：US20170142238A1

    公开(公告)日：2017-05-18

    申请号：US15319428

    申请日：2015-06-15

    Applicant: Norwegian University of Science and Technology

    Inventor： Danilo Gligoroski ,  Katina Kralevska

    IPC: H04L29/08 ,  H04L29/06 ,  H03M7/00

    CPC classification number: H04L69/324 ,  H03M7/00 ,  H03M13/353 ,  H03M13/373 ,  H03M13/616 ,  H04L1/0009 ,  H04L1/0076 ,  H04L69/22

    Abstract: Disclosed herein is a method of generating a coded data packet in dependence on a plurality of source data packets, the method comprising: determining a plurality of data packets, for generating a coded data packet, from a plurality of source data packets for encoding, wherein each of the plurality of source data packets for encoding comprises the same number of bits; generating a multiplied data packet in dependence on one or more multiplication operations between a multiplication value and bits of one of the determined data packets; and generating a coded data packet in dependence on a combination of the multiplied data packet and one or more of the other of said plurality of determined data packets that have not been multiplied; wherein the one or more multiplication operations are performed as operations in the finite field GF(p); p is greater than 2; the multiplication value is an element of the finite field GF(p); the multiplication value is not 0 or 1; and the combination of data packets is performed by bitwise XOR operations. Advantageously, the coding scheme can be almost as computationally efficient as GF(2) and the likelihood of obtained coded data packets being linearly independent is greatly increased.

    Fiber Amplifier
    13.
    发明申请
    Fiber Amplifier 有权
    光纤放大器

    公开(公告)号：US20150288131A1

    公开(公告)日：2015-10-08

    申请号：US14269229

    申请日：2014-05-05

    Applicant: Norwegian University of Science and Technology

    Inventor： Vladislav Vladimirovich Dvoyrin ,  Irina T. Sorokina

    IPC: H01S3/094 ,  G02B6/036 ,  H01S3/00 ,  H01S3/067 ,  H01S3/30 ,  G02B6/02 ,  G02F1/35

    CPC classification number: H01S3/0092 ,  G02F1/355 ,  G02F1/365 ,  G02F2001/3528 ,  H01S3/06725 ,  H01S3/06754 ,  H01S3/094007 ,  H01S3/09415 ,  H01S3/1616 ,  H01S2301/03 ,  H01S2301/085

    Abstract: The present application provides an optical system. The optical system includes a fiber amplifier with an optically active doped fiber, a source of seed pulses, and a pump source. The doped fiber is doped with one or more active element(s) selected such that the seed pulses are amplified in intensity. The doped fiber has a negative (anomalous) group velocity dispersion in the region from the wavelength of the seed pulses to a threshold wavelength at which the magnitude of the optical loss of the doped fiber is greater than a gain due to stimulated Raman scattering.

    Abstract translation: 本申请提供了一种光学系统。 光学系统包括具有光学有源掺杂光纤的光纤放大器，种子脉冲源和泵浦源。 掺杂光纤掺杂有一个或多个选择的有源元件，使得种子脉冲的强度被放大。 掺杂光纤在从种子脉冲的波长到阈值波长的区域中具有负（异常）组速度色散，在阈值波长处，掺杂光纤的光损耗的大小大于由于受激拉曼散射引起的增益。

    Method and apparatus for calibrating an instrument for surgical intervention
    14.
    发明授权
    Method and apparatus for calibrating an instrument for surgical intervention 有权

    公开(公告)号：US12220178B2

    公开(公告)日：2025-02-11

    申请号：US17272451

    申请日：2019-09-13

    Applicant: Norwegian University of Science and Technology (NTNU)

    Inventor： Daniel Fossum Bratbak

    IPC: A61B34/20 ,  G06T7/73 ,  A61B17/00

    Abstract: A method of calibrating an instrument for surgical intervention is provided. The instrument to be calibrated has a tip at a distal end thereof and a navigation array that is spaced from the distal end and is detectable in space. The navigation array has a fixed spatial and angular relationship with the tip. The method comprises the steps of: placing a calibrator on the tip of the instrument such that the tip is positioned within the calibrator at a known displacement from the centre of the calibrator, the calibrator having a circular shape and being detectable as a single point in space; detecting the position of the navigation array and the centre of the calibrator; and determining the position of the centre of the calibrator relative to the navigation array, thereby calibrating the position of the tip of the instrument relative to the navigation array. There is also provided a calibrator for use in such a method.

    Joints for Pre-Cast Driven Piles
    15.
    发明申请
    Joints for Pre-Cast Driven Piles 有权

    公开(公告)号：US20250003168A1

    公开(公告)日：2025-01-02

    申请号：US18710355

    申请日：2022-11-15

    Applicant: NORWEGIAN UNIVERSITY OF SCIENCE AND TECHNOLOGY

    Inventor： Habibollah SADEGHI ,  Rao Martand SINGH

    IPC: E02D5/52 ,  F24T10/10

    Abstract: A first part of a joint for joining pre-cast driven geothermal pile segments comprises a cap having an end plate and a peripheral wall extending from a periphery of the end plate, the end plate and peripheral wall defining a volume; and at least two apertures passing through the cap, wherein each aperture provides a passage from an inside of the cap to an outside of the cap; and wherein each aperture is provided within a recess in the peripheral wall such that each aperture is thereby recessed within the volume defined by the end plate and the peripheral wall. The apertures being recessed ensures that they, and any fluid connection made thereat, are shielded from any damage and the harsh forces involved in the installation of the driven pile segments.

    Determination of Drillstring Parameters and Associated Control
    18.
    发明公开
    Determination of Drillstring Parameters and Associated Control 审中-公开

    公开(公告)号：US20230151725A1

    公开(公告)日：2023-05-18

    申请号：US17802282

    申请日：2021-02-25

    Applicant: Norwegian University of Science and Technology

    Inventor： Sigve Hovda ,  Sigbjorn Sangesland ,  Asbjorn Djupdal ,  Magnus Jahre

    IPC: E21B44/00 ,  E21B37/00 ,  E21B45/00 ,  E21B47/04

    CPC classification number: E21B44/00 ,  E21B37/00 ,  E21B45/00 ,  E21B47/04 ,  E21B2200/20

    Abstract: A method for modelling a drillstring in a wellbore, the method comprising providing a model of the drillstring, the model representing the drillstring by a sequence of alternating springs and elements, where each element describes the mass and/or the moment of inertia of a corresponding part of the drillstring and each spring represents at least one of: axial, torsional and/or bending stiffnesses of one of the corresponding parts of the drillstring, wherein the model describes one or more forces on each element by one or more systems of ordinary equations of first or second order, where each equation comprise a linear part that comprises constant coefficients and a non-linear part that includes one or more of: one or more non-linear terms, one or more non-smooth terms, one or more time dependent terms and/or one or more coupled terms; and the method comprises recalculating the model for a plurality of time steps, wherein recalculating the model for the respective time step comprises calculating one, two or three dimensional positions, orientations and/or associated derivatives of all of the elements for the respective time step based on one, two or three dimensional positions, orientations and/or associated derivatives of all element at a previous time step, by describing the non-linear part by a form of expansion with respect to time and solving the system of equations either analytically or by the use of exponential integrators for the duration of the respective time step. Also described is a method of cleaning a wellbore using the model from the above method.

    Surgical stapler, anvil for a surgical stapler, and a method of stapling tissue
    20.
    发明授权
    Surgical stapler, anvil for a surgical stapler, and a method of stapling tissue 有权

    公开(公告)号：US11413044B2

    公开(公告)日：2022-08-16

    申请号：US16881889

    申请日：2020-05-22

    Applicant: Norwegian University of Science and Technology

    Inventor： Lars Cato Rekstad ,  Brynjulf Ystgaard

    IPC: A61B17/072 ,  A61B17/115

    Abstract: A surgical stapler includes a proximal end and a distal end and an anvil at the distal end for providing resistance to staples during the stapling operation of the surgical stapler. The anvil may include a number of segments arranged end-to-end. The anvil is elongated in the collapsed state, the anvil being elongated generally in a first direction D1. The anvil is configured such that the segments rotate about a rotation axis along a perpendicular second direction D2 when the anvil is actuated between the deployed and the collapsed states. The anvil is configured such that adjacent segments pivot relative to each other about a pivot axis along a third direction D3 when the anvil is actuated between the deployed and collapsed states. The stapler also includes an actuator mechanism, wherein the actuator mechanism is configured to be controlled from a location on the surgical stapler towards the proximal end.

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