Abstract: The present invention relates to a production method of a plastic optical fiber which comprises the steps of heat drawing an undrawn plastic optical fiber obtained by melt spinning and annealing the drawn fiber at a circumferential velocity ratio between the front and rear rollers (circumferential velocity of a rear roller/circumferential velocity of a front roller) of 0.5 to 1.2 under heating conditions which satisfy 4?y??1.5x+330 and (Tgc?5)° C.?x?(Tgc+110)° C. [Tgc: a glass transition temperature of a core, x: an annealing temperature (° C.), and y: an annealing time (seconds)]. According to the present invention, a plastic optical fiber having a small thermal shrinkage ratio and excellent heat resistance can be provided.

Abstract: If a master data transmission apparatus is included in an optical data transmission system, a clock recovered by a first clock recovery unit 91 based on an optical signal received from the optical data transmission system is selected by a clock selecting unit 93. If the master data transmission apparatus is included in an electrical data transmission system, a clock recovered by a second clock recovery unit 92 based on a lock signal received from the electrical data transmission system is selected by the clock selecting unit 93. A mapping unit 74, a digital filter 75, and a D/A converting unit 76 perform processing in accordance with the clock selected by the clock selecting unit 93.

Abstract: A data transmission apparatus 10 for transmitting a data signal in accordance with a predetermined protocol in one direction within a ring network of a plurality of data transmission apparatuses includes: signal determination means 11 for determining a presence or absence of a data signal from an immediately upstream data transmission apparatus 10 in the ring network based on an amplitude of the data signal; and stopping means for stopping transmission of the data signal to an immediately downstream data transmission apparatus 10 if the signal determination means 11 determines that there is no incoming data signal. The data signal is a signal obtained by modulating an amplitude component of an electrical signal of a predetermined frequency. Thus, a data transmission apparatus is provided which can quickly detect a momentary power interruption in a data transmission system composed of data transmission apparatuses interconnected in a ring fashion.

Abstract: In a physical layer of each data transmission apparatus 1, a physical layer initialization process is performed in response to a reset exit process performed by the irrespective CPUs 4. Then, in a link layer of a master data transmission apparatus 1 and in a link layer of a data transmission apparatus 1 which operates in a normal mode, after the completion of the physical layer initialization process, a link layer initialization process is performed in response to a reset exit process performed by their respective CPUs 4, and then the data transmission apparatuses 1 start data communication using their respective physical layers and link layers. On the other hand, a link layer of a data transmission apparatus 1 which operates in a bypass mode maintains its reset state, and the data transmission apparatus 1 transmits data using only its own physical layer by bypassing its own link layer.

Abstract: This invention provides hollow fibers impregnated with gel in which the gel firmly adheres to the inner walls of the hollow fibers due to the introduction of comb polymers on the inner walls of the hollow fibers. These hollow fibers impregnated with gel have no gaps at the interfaces between the inner walls thereof and the gel. Accordingly, analysis can be performed with high accuracy. Also, thin slices obtained by bundling these hollow fibers and then slicing this bundle have sufficient adhesion between the gel and the inner walls of the hollow fibers. This also prevents gel from becoming detached from the inner walls at the time of slicing or during operations such as hybridization.

Abstract: The present invention relates to an electrophoretic device in the form of a casing having inside sealed spaces isolated by an electrophoretic carrier, wherein the device comprises at least one liquid injection/discharge opening, communicable with the outside, on the outer wall of said sealed spaces, and an electrophoretic method and a specimen detection method using the device. Additionally, the present invention relates to an electrophoresis apparatus having a structure for sandwiching the electrophoretic carrier between a pair of electrodes, and having a space capable of holding liquid between the sandwiched electrophoretic carrier and the respective electrodes, and to an electrophoretic method using the same device.

Abstract: A data reception method, an apparatus implementing such a method, and a data transmission system are disclosed, in which appropriate evaluation levels for signal levels are set during initialization of data communications using small circuitry. A comparator 574 compares a difference value dd against its corresponding model value. If the difference value dd is greater than the model value, the comparator 574 updates one of registers 576a to 576n which is currently selected, by adding a predetermined numeric value to the model value. If the difference value dd is smaller than the model value, the comparator 574 updates one of the registers 576a to 576n which is currently selected, by subtracting a predetermined numeric value from the model value. An evaluation level value arithmetic circuit 572 calculates evaluation levels R1 to R13 using model values set in the registers 576a to 576n, and stores the evaluation levels R1 to R13 respectively to registers 577a to 577m of an evaluation level storage section 573.

Abstract: In an attachment structure of a rear panel to a tuner, a rear panel to be attached to a tuner that is smaller in depth size has, in portions corresponding to connector connection parts of the tuner, two holes for inserting the connector connection parts, and has, in a portion corresponding to a small protrusion with a tapped hole of the tuner, a small cylindrical part. When the rear panel is attached onto the front surface of the tuner, the two connector connection parts of the tuner are inserted into the two holes, a leading end of the small cylindrical part is brought into contact with a front surface of the small protrusion with the tapped hole of the tuner, a male screw is inserted into the small cylindrical part from the front surface side of the rear panel, and a leading end of the male screw is screwed into the tapped hole.

Abstract: A receiver includes a noise reduction circuit for eliminating noise from a differential signal transmitted through a differential transmission line and a data recovery circuit for recovering data from a differential signal outputted from the noise reduction circuit. The noise reduction circuit includes common-mode chokes for reflecting common-mode noise superimposed on an input differential signal and a common-mode noise reduction circuit for directing the common-mode noise reflected by the common-mode chokes to a low potential point of the common-mode noise reduction circuit.

Abstract: An apparatus for exchanging electrode chips used for resistance welding. The apparatus includes a base to which a shaft is rotatably mounted. A power source is connected to one end of the shaft to rotate the shaft. An electrode chip-withdrawing knife tool is made of a board connected to the other end of the shaft. The knife tool is provided with recesses which are radially directed about the axis of the shaft. The recesses have their respective knife edge portions each of which is fitted into an annular groove formed between the step portion at the front end of the shank of each arm of a welding gun and the electrode chip fitted over the shank. An electrode chip supply holder in which new polished electrode chips are received is held by a guide member.