Dolman, GB
Geoffrey Dolman, Birmingham GB
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20100104876 | PIEZOELECTRIC COMPOSITE MATERIAL - The present invention provides a method for producing a composite material comprising an array of piezoelectric fibres, the method comprising: (a) providing: (a1) a plurality of first strips comprising a piezoelectric material or a precursor to a piezoelectric material, and a first carrier, and (a2) a plurality of second strips comprising a decomposable material, and a second carrier; (b) placing said pluralities of said first and second strips alternately on top of one another to form a stack in which at least a portion of said first strips is separated from adjacent first strips by a second strip; (c) a heating step comprising heating said stack to remove said first and second carriers and said decomposable material; (d) impregnating said stack with a filler material to form a composite stack of piezoelectric strips; and (e) cutting said stack to form a composite material comprising an array of piezoelectric fibres. In an alternative method the cutting (e) is performed before the heating step (c). The methods allow for the production of fibre arrays with mean fibre spacing of 5 ym or less. | 04-29-2010 |
Graham Dolman, Ickleton GB
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20100297966 | Measuring and Correcting Errors in a Transmit Chain with an IQ Up-Converter and IQ Down-Converter - A transmit chain comprises a transmit path with a quadrature up-converter which up-converts quadrature signal components to RF. An observation path samples a portion of the RF signal and a quadrature down-converter down-converts the RF signal to baseband quadrature signal components. A local oscillator signal source provides the up-converter and the down-converter with a local oscillator signal and is operable in two states. In a second of the states the local oscillator signal is applied to the up-converter and the down-converter and a phase shift is made to the signal applied to up-converter or the down-converter compared to the first of the states. A processor monitors properties of the down-converted signal while the local oscillator signal source is operating in the first state and the second state. The processor calculates a correction to apply to the baseband observation signal to correct for errors introduced by the observation path. The processor also calculates a correction to apply to the input signal to correct for errors introduced in the transmit path. | 11-25-2010 |
Graham Dolman, Saffron Walden GB
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20090160549 | Linearised Power Amplifier - A linearised power amplifier including a predistorter and a feedforward circuit is described. By using both a predistorter and a feedforward cancellation system the linearisation of the amplifier is increased. The accuracy of the amplified signal may be further improved by training the predistorter using the error signal produced by the feedforward cancellation system. Improved accuracy in the lineariser results in a reduction in the power requirement of the error amplifier and a relaxation in the phase, amplitude and delay accuracy of the feedforward loop. | 06-25-2009 |
20090303135 | ANTENNAS - Embodiments of the invention relate to a broadband antenna structure and an antenna arrangement comprising the antenna structure and an electronic device. In one aspect, the antenna employs an electrically conductive enclosure with a closed end, over which a non-electrically conductive cover is placed. A radiating portion of the antenna feed layer comprising a conductive patch antenna element is placed in between the enclosure and the cover. This patch antenna element design is inherently broader band than that of conventional cavity-backed slot-radiating antennas, which are constrained in bandwidth by the need to keep the cavity formed in the enclosure small, so that the column elements may be arranged in an array at substantially half-wavelength spacing. The new design suffers less compromise in terms of bandwidth in achieving the same size constraint. This is achieved in part by the dielectric constant of the dielectric material of the cover reducing the required size of the conductive antenna element, compared to the size that would be required if the radiating portion were covered with a material with the dielectric constant of air. In another aspect, this broadband antenna structure is connected with an electronic device to form an antenna arrangement, wherein a portion of the antenna feed layer extends outside of the antenna housing through an opening in a surface of the antenna housing, said portion being within the electronic device enclosure of the electronic device. Connecting the electronic device directly to the antenna according to embodiments of the invention reduces the amount of coaxial cables needed or eliminates the need for coaxial cables completely. As a result the usual costs associated with coaxial cables, the RF losses introduced by the cables which can compromise the system performance, possible failure of the cables, lease costs for the space the cables occupy and lease costs for large footprint of the building or cabinet housing the electronic device are substantially reduced or eliminated. | 12-10-2009 |
Mark Dolman, London GB
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20080234228 | Boronic acid salts - Salts of a peptide boronic add drug, for example of Cbz-(R)-Phe-(S)-Pro-(R)-Mpg-B(OH) | 09-25-2008 |
20080287370 | Boronic Acid Salts Useful in Parenteral Formulations - Salts of a peptide boronic acid drug, for example of Cbz-(R)-Phe-(S)—Pro-(R)-Mpg-B(OH) | 11-20-2008 |
20100035827 | Multivalent metal salts of boronic acids - Salts of a pharmaceutically acceptable divalent metal and an organoboronic acid drug. Examples of such metals are calcium, magnesium and zinc. The organoboronic acid drug may be a boropeptide protease inhibitor. The salts may be formulated in oral dosage form. | 02-11-2010 |
20100113393 | Boronic Acid Salts - Salts of a peptide boronic acid drug, for example of Cbz-(R)-Phe-(S)-Pro-(R)-Mpg-B(OH) | 05-06-2010 |
Richard Dolman, Banstead GB
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20090093965 | DETERMINING FAULT TRANSMISSIVITY IN A SUBTERRANEAN RESERVOIR - To determine fault transmissivity in a subterranean reservoir, fault structures in the subterranean reservoir are identified, and elastic impedance data is computed from well log data and seismic data. Normalization parameters that have a predetermined orientation with respect to the identified fault structures are computed, and elastic impedance flux values are normalized with respect to the normalization parameters, where the normalized elastic impedance flux values are indicative of transmissivities of fault structures in the subterranean structure. | 04-09-2009 |
William G. Dolman, Shouldham Norfolk GB
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20120231674 | Improvements to Plugs and/or Sockets - A socket comprises a plurality of recesses with electrically conductive contacts; said recesses being configured to receive the prongs of a corresponding plug; and a plug housing recess for receiving at least a portion of the housing of a plug; wherein said plug housing recess incorporates an engagement surface against which said plug engages in order to pivot between an initial position where the prongs are positioned to enter the recesses and a position where the prongs are fully engaged within the recesses. A plug suitable for use with this socket is also presented. | 09-13-2012 |