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    Carbohydrate-mediated purification of petrochemicals
    5.
    发明授权
    Carbohydrate-mediated purification of petrochemicals 有权

    公开(公告)号：US10239044B2

    公开(公告)日：2019-03-26

    申请号：US15316393

    申请日：2015-06-08

    Applicant: Northwestern University ,  King Abdulaziz City for Science and Technology

    Inventor： James M. Holcroft ,  Karel J. Hartlieb ,  James Fraser Stoddart

    IPC: C07C7/12 ,  B01J20/22 ,  B01J20/30 ,  C07C7/13 ,  C07C17/38 ,  B01J20/28 ,  C07C17/389

    Abstract: A separation medium consisting of a cyclodextrin metal-organic framework (CD-MOF) for separating aromatic compounds and methods of preparing the same are presented. Bottom-up preparations include the following steps: (a) preparing a first mixture comprising a cyclodextrin, an alkali metal salt, water and an alcohol; (b) performing one of the following two steps: (i) stirring the first mixture; or (ii) adding an amount of a surfactant to the first mixture to form a second mixture; and (c) crystallizing the CD-MOF from the first mixture or the second mixture. Top-down preparations include the following steps: (a) preparing a first mixture comprising the cyclodextrin, an alkali metal salt, water and an alcohol; (b) crystallizing the CD-MOF from the first mixture; and (c) optionally performing particle size reduction of the crystallized CD-MOF. The CD-MOFs are amenable for use in methods for separating alkylaromatic and haloaromatic compounds from a mixture of hydrocarbons.

    Method and system for efficiently embedding a watermark in a digital image for mobile applications
    6.
    发明授权
    Method and system for efficiently embedding a watermark in a digital image for mobile applications 有权

    公开(公告)号：US10078877B2

    公开(公告)日：2018-09-18

    申请号：US14949622

    申请日：2015-11-23

    Applicant: King Abdulaziz City for Science and Technology

    Inventor： Norah Alquwayfili ,  Amr Alasaad

    IPC: G06K9/00 ,  G06T1/00

    CPC classification number: G06T1/0028 ,  G06T2201/0061

    Abstract: The invention provides a method and system for embedding a watermark in a digital image and recovering the watermark from the digital image. The method includes representing the plurality of binary bits in the watermark using a plurality of symbols, wherein each symbol of the plurality of symbols represents at least two binary bits. The plurality of symbols are then transformed into a plurality of pseudo noise (PN) sequences, wherein a symbol transformed into a PN sequence represents one or more PN sequence vectors from a set of PN sequence vectors. Once the transformation is done, the plurality of PN sequences are embedded in the digital image to generate a watermarked image. During recovery, the watermark is recovered from the watermarked image by identifying the plurality of PN sequences in the watermarked image for recovering the corresponding plurality of symbols associated with the watermark.

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