摘要:
A thermal energy storage medium comprising a hydrophilic polysaccharide supporting an inorganic salt that is capable of transforming from one phase to a less hydrated phase absorbing latent heat, and releasing this latent heat upon the reverse transformation. The polysaccharide, preferably Xanthan Gum, may be incorporated in concentrations of 0.05% to 3% together with a nucleating agent in order to form a material that transforms when cooled back to the transformation temperature, or in greater concentrations of 1% to 5% without a nucleating agent to form a material that may be cooled below the transformation temperature without transformation taking place, and stored at ambient temperature whilst still storing the latent heat until activated. The medium is gelled in the less hydrated phase and in some embodiments the gel is pseudoplastic thus enabling it to be poured into chambers of an energy storage device, and then regain its original viscosity at rest.
摘要:
An acoustic transducer (10) includes a perforated member (12); a movable diaphragm (16) spaced from the perforated member (12); spring means (54, 56, 58, 60) interconnecting the diaphragm (16) and the perforated member (12) for movably supporting the diaphragm (16) relative to the perforated member (12); a pressure equalization slot (26) for controlling the flow of fluid through the diaphragm (16), the slot (26) equalizing the pressure on opposite sides of the diaphragm (16) for defining the low frequency response; and means (32) for applying an electric field across the perforated member (12) and the diaphragm (16) for producing an output signal representative of the variation of the space between the perforated member (12) and the diaphragm (16) in response to an incident acoustic signal.
摘要:
A bidirectional parallel signal interface for providing a parallel data interface between a computer and an external peripheral device includes an interface circuit with command registers for communicating commands and data, a first-in, first-out (FIFO) memory for communicating data between the computer and the peripheral device, and host and slave state machines for receiving commands from the command registers and in accordance therewith controlling communication of data between the FIFO and peripheral device and communicating control signals to and from the peripheral device. The communication of data between the FIFO and peripheral device is effected in accordance with the commands from the command registers. The communications of control signals by the host and slave state machines are responsive to their control signals with such responsiveness being control controllable in accordance with the commands from the command registers. The communication of data from the FIFO to the peripheral device is halted by the host state machine in accordance with its commands from the command registers. The command registers include a status register for storing data from the peripheral device representing a number of status states of the peripheral device.
摘要:
A method of fabricating a trench DMOS transistor structure results in the contact to the transistor's source and body being self-aligned to the trench. With a self-aligned contact, the distance from the edge of the source and body contact to the edge of the trench can be minimized. Thus, the distance between the trench edges can be reduced. As a result, the packing density of the transistor is increased dramatically. This gives rise to much improved performance in terms of low on-resistance and higher current drive capability. The process flow maximizes the height of the trench poly gate prior to formation of oxide spacers for the self-contact contact, thereby ensuring sufficient step height for the spacers.
摘要:
A microprocessor that executes instructions to process data in accordance with periodic cycles of a microprocessor system clock. A three-stage pipeline has decode (70), execute (72) and writeback (74) stages. The execution unit fetches instructions and operands and computes memory addresses utilized in retrieving these from storage and in writing results to storage. The decode unit also has a prefetch unit and microsequencer.
摘要:
A handpiece for use in transmyocardial revascularization heart-synchronized pulsed laser system includes a barrel (24) having a passage (62) for transmitting a laser beam; a surface (32) at the distal end of the barrel for contacting the wall of the heart (66); an aperture (26) located at the distal end of the barrel in the enlarged surface (32) for transmitting the laser beam; and means for focusing (42) the laser beam proximate to the aperture to vaporize the tissue of the heart wall and create a hole to the interior heart chamber.
摘要:
Embodiments according to the present invention provide tamper resistant structures which make it more difficult to reverse engineer integrated circuits. In one embodiment, a tamper resistant structure on a passivation layer leaves portions of the passivation layer exposed. Mechanical or chemical removal of the tamper resistant structure damages exposed portions of the passivation layer and makes reverse engineering difficult. Other embodiments of the tamper resistant structure include patterned and unpatterned structures containing hard materials, chemically resistant materials, amalgams, fibrous materials, and/or meshes attached to a passivation layer. Tamper resistant structures can also be provided between layers of the active circuitry.
摘要:
Near-end echo-reduction is achieved by passing a transmit signal through a first filter bank and feeding a remote signal plus an echo of the transmit signal through a second filter bank, then subtracting a gain-coefficient-compensated (scaled) version of the filtered transmit signal from the filtered-composite-remote signal to obtain an echo-reduced receive signal. The echo-reduced receive signal is suitably employed by tone decoders, voice response mechanisms, and the like, in a telephone system, and avoids false alarms due to near-end echo. In one embodiment, the gain coefficients are fixed for each frequency of interest. In another embodiment, the gain coefficients are dynamically arrived at based on the filtered transmit signal and the echo-reduced receive signal. The two filter banks can be combined in one, multiplexed filter bank.
摘要:
A CMOS circuit formed in a silicon-on-insulator (SOI) substrate includes MOSFETs having drain and body diffusions which extend through the silicon layer to the surface of the insulating layer. Each of drains of the N-channel and P-channel MOSFETs serves also as a terminal (anode or cathode) of a diode that is connected in series with the MOSFET. This structure allows the CMOS device to be fabricated as a completely symmetrical structure without adding processing steps beyond those customary in fabricating conventional CMOS devices.