Hewlett-Packard

About: Hewlett-Packard is a company organization based out in Palo Alto, California, United States. It is known for research contribution in the topics: Signal & Substrate (printing). The organization has 34663 authors who have published 59808 publications receiving 1467218 citations. The organization is also known as: Hewlett Packard & Hewlett-Packard Company.

Large expandable array thermal ink jet pen and method of manufacturing same

Abstract: A hybrid type thermal ink jet (TIJ) pen and method of manufacture wherein a plurality of individual thin film ink jet printheads, each including an orifice plate, are selectively spaced on and secured to an insulating substrate having ink feed ports therein which supply ink to the printheads. Buss lines and integrated circuit driver-decoder packages may be mounted in a planar fashion with respect to the printheads and electrically interconnected to drive the printheads. Alternatively, the individual printheads may be mounted on a unitary insulating support and ink feed structure such as a ceramic substrate and interconnected to off-substrate TIJ driver circuitry by way of printed or silk-screened electrical leads. These leads may be laid down in a controlled pattern on the surface of the ceramic substrate and used to interconnect bonding pads on the TIJ printheads with the above off-substrate driver circuitry and power supplies. If desired, integrated circuit packages may be mounted in slots cut in the ceramic substrate in a planar arrangement with respect to the printheads.

Container-based data center

Abstract: A computing system and method of operating a computing system is provided. The computer system includes: a housing comprising a shipping container having a first interior lateral wall and a second interior lateral wall; a first row of equipment provided along the first interior lateral wall with a first exhaust region between the first row of equipment and the first interior lateral wall; a second row of equipment provided along the second interior lateral wall with a second exhaust region between the second row of equipment and the second interior lateral wall; and an aisle provided between the first row of equipment and the second row of equipment; wherein said first and second rows of equipment each comprise a plurality of rack assemblies and a plurality of computers supported by the plurality of rack assemblies such that front sides of the computers face the aisle and back sides of the computers face either the first or second interior lateral walls, said front and back sides of the computers including vents enabling cooling air to pass through the computers between the aisle and the first and second exhaust regions.

Method and apparatus for storing and retrieving information on a replaceable printing component

Abstract: An ink jet printing system including a replaceable printing component for use in the printing system. The replaceable printing component includes a memory portion associated therewith for storing information that does not relate directly to normal operation of the printing system. Also included is a control portion for providing information to the memory portion associated with the replaceable printing component.

Method and apparatus for processing network packets using time stamps

Abstract: A network device receives packets from a first network segment, time stamps the packets as they arrive, and transmits the packets to a second network segment. By time stamping packets as they arrive, stale packets can be identified and discarded. A stale packet is a packet that has been pending in the network device longer than an active timeout interval, which may be varied based on network traffic levels to conserve network bandwidth. Packets may also be discarded to conserve packet buffer memory in the network device. For example, when an incoming packet arrives and an output buffer in which the packet must be stored is full, the output buffer is scanned to identify and discard packets that have exceeded a minimum timeout interval, thereby allowing the incoming packet to be stored in the output buffer. Many network protocols initiate the retransmission of packets after a timeout interval has expired and an acknowledge packet has not been received. The present invention conserves network bandwidth by not transmitting stale packets that either will be ignored or redundant when network traffic becomes heavy. The present invention also conserves buffer memory by allowing broadcast and multicast packets to be stored in and transmitted from a single broadcast packet output buffer. The proper packet transmission order at each port is maintained by comparing the time stamp assigned to the broadcast packet when it arrived at the network device with the time stamps of the other packets in the output buffer. Finally, the present invention provides many opportunities for collecting statistics, such as the average latency, mean latency and standard deviation of the latency of packets processed by network device.

Electrically-pumped compact hybrid silicon microring lasers for optical interconnects.

Abstract: We demonstrate an electrically-pumped hybrid silicon microring laser fabricated by a self-aligned process. The compact structure (D = 50 μm) and small electrical and optical losses result in lasing threshold as low as 5.4 mA and up to 65 °C operation temperature in continuous-wave (cw) mode. The spectrum is single mode with large extinction ratio and small linewidth observed. Application as on-chip optical interconnects is discussed from a system perspective.