In AlN crystal grains constituting a sintered body, is contained: 150 ppm-0.5 wt. %, preferably at most 0.1 wt.%, of at least one rare earth element (as oxide thereof); at most 900 ppm, preferably at most 500 ppm of at least one metal impurity except rare earth elements; and preferably at least 0.5 wt. % of oxygen measured by an electron probe X-ray microanalyzer. The grains have an average grain diameter of preferably at least 3.0 μm and show a main peak in the wavelength range of 350-370 nm of spectrum obtained by a cathode luminescence method. The sintered body composed of AlN crystal grains has a volume resistivity at room temperature of at most 1.0×10 12 Ω·cm.

Aluminium nitride sintered body, metal embedded article, electronic functional material and electrostatic chuck

A data transmission apparatus having a storage device for storing at least one structure data piece of a data processing device in a receiving data processing apparatus, a computation device for computing a transmission error detection code from the structure data stored in the storage device and a device for attaching the transmission error detection code computed by the computation device to the structure data stored in the storage device. The data transmission apparatus further includes a transmitter for transmitting the structure data to which the transmission error detection code is attached to a receiving apparatus, a receiver for receiving a retransmission request for each structure data piece returned from the receiving apparatus when a transmission error is detected based on the transmission error detection code and structure data transmitted by the transmitter, and a device for responding to the restransmission request for each structure data piece received by the reception means by retransmitting the corresponding structure data piece to the receiving apparatus.

Data transmission apparatus and method

PROBLEM TO BE SOLVED: To provide an aluminum nitride sintered compact which is free from disadvantage such as occurrence of discharge when a voltage is applied, and which has low volume resistivity while maintaining high thermal conductivity, and to provide an electrostatic chuck using the same. SOLUTION: The aluminum nitride sintered compact having volume resistivity at normal temperature of 1×10 9 to 1×10 14 Ω cm and in which discharge hardly occurs in the case that voltage is applied is obtained by preparing a composition comprising at least one kind selected from Sm and La in an amount of 0.5 to 7 mass%, expressed in terms of its oxide, and further comprising titanium nitride in an amount of ≤28 mass% for suppressing the exhaust of liquid phase components, and the balance substantially aluminum nitride. A body 10 to be attracted is attracted by using this aluminum nitride sintered compact as a dielectric layer 2 for attracting the body to be attracted and applying a voltage to an electrode 3 provided below the dielectric layer 2. COPYRIGHT: (C)2011,JPO&INPIT

Aluminum nitride sintered compact and electrostatic chuck using the same

Provided is an alumina composite ceramic composition which has electrical insulation properties as well as better mechanical strength and thermal conductivity than a typical alumina-based material. Thus, the alumina composite ceramic composition is promising for a material of a substrate or an insulating package of an electronic device. The alumina composite ceramic composition of the present invention may include alumina (Al 2 O 3 ), zirconia (ZrO 2 ) or yttria-stabilized zirconia as a first additive, and graphene oxide and carbon nanotubes, as a second additive. In this case, in consideration of two aspects of sinterability and electrical resistivity characteristics of the alumina composite ceramic composition, the graphene oxide may be appropriately adjusted to be in the form of a graphene oxide phase and a reduced graphene phase which coexist in the alumina composite ceramic composition.

Alumina composite ceramic composition and method of manufacturing the same

PURPOSE:To enhance the utilizing efficiency of the network and to reduce the possibility of regeneration of congestion by sending only a missing cell when the cell is missing due to congestion or the like in a network and the cell is sent again. CONSTITUTION:When a cell with SN=2 is missing due to congestion or the like in a network, a receiver side AAL sends a NACK cell representing a retransmission request of the cell with SN=2, the sender side AAL receiving it sends again the cell with SN=2, the receiver side AAL receiving the cell gives a frame to a host layer, returns an ACK cell, the sender side AAL receiving it opens an internal buffer storing the cell and it is informed to the host layer. Then an ACK/NACK identifier in succession to a multiple identifier MID to represent which of the ACK or the NACK cell the cell is given the ACK/NACK cell and a required number of extended sequence numbers ESN being the extension of a 4-bit sequence number SN to indicate to which part of the original frame a missing cell corresponds in the NACK cell.

Frame re-transmission method

PURPOSE: To effectively utilize network resources such as a line, etc by maintaining the transfer efficiency, by transferring the image information by dividing it into packet units, resending only a wrong packet, as for the image information which has caused a packet error or a packet loss, and restoring it at every packet CONSTITUTION: One of image terminal equipments 11 which are connected to a switching network PS is used as an outgoing terminal 11, the other is used as an incoming terminal 11, and when image information is transferred between both terminals, each of information blocks is divided, reconstituted to plural packets 12, and the transfer is executed by a packet unit When a loss or an error of the packet 12 is detected by the incoming terminal 11, the incoming terminal 11 requests to the outgoing terminal 11 to resend the packet 12 which is lost or made an error and executes its restoration, and a transmittal confirmation between both the outgoing and incoming terminals is executed by using an exclusive block for resending the transmittal confirmation, after a transfer of plural packets 12 belonging to one information block is ended In such a way, a high transfer efficiency can be maintained, and network resources such as a line and an exchange, etc can be utilized effectively COPYRIGHT: (C)1988,JPO&Japio

Koichi Onishi

Papers

Image information transferring control system