Mitsubishi

About: Mitsubishi is a company organization based out in Tokyo, Japan. It is known for research contribution in the topics: Signal & Layer (electronics). The organization has 53115 authors who have published 54821 publications receiving 870150 citations. The organization is also known as: Mitsubishi Group of Companies & Mitsubishi Companies.

Semiconductor memory module and register buffer device for use in the same

Abstract: In a semiconductor memory module having a plurality of DRAMs, when an input command is detected as a refresh command according to external control signals externally input for command-execution to a register buffer, internal control signals for a partial number of the DRAMs preliminarily selected among the plurality of DRAMs are delayed. Thus, the refresh command is executed with a time difference, and the semiconductor memory module prevents the plurality of dynamic semiconductor memories from simultaneously entering refresh modes to cause a great peak current to flow, and thereby implementing a stable operation.

Recovery of Uranium from Seawater

Abstract: Seawater contains various elements in solution. Deuterium, lithium, and uranium are the important ingredients for energy application at present and in the future. This paper deals with the recovery of uranium from seawater, with emphasis on the development of an adsorbent with high selectivity and rate of adsorption for uranium. Polyacrylamidoxime chelating resins were synthesized from various co-polymers of acrylonitrile and cross-linking agents. The resulting resins with the chelating amidoxime group showed selective adsorption for uranium in seawater. The amount of uranium adsorbed from seawater at room temperature reached 3.2 mg/g resin after 180 days. Polyacrylamidoxime fiber, which was prepared from polyacrylo-nitrile fiber and hydroxylamine, showed a high rate of adsorption for uranium. The polyacrylamidoxime fiber conditioned with 1 M HCl and 1 M NaOH adsorbed 4 mg U/g fiber from seawater in ten days.

Mobile communication terminal equipment usable for both satellite and terrestrial communications

Abstract: A mobile communication terminal equipment is mounted in a vehicle and can utilize both the satellite and terrestrial communication systems. The mobile communication terminal equipment includes a satellite transceiver and a portable set. The satellite transceiver has a satellite transmission/reception circuit. As required, the portable set is disconnected from the satellite transceiver to be carried by the user. The portable set includes a terrestrial transmission/reception circuit, a signal input/output circuit and a connection selecting switch. The connection selecting switch is automatically controlled to connect the signal input/output circuit selectively to one of the satellite and terrestrial transmission/reception circuits. When the satellite transmission/reception circuit is in connection with the signal input/output circuit, the communication through the satellite wireless communication system can be carried out. When the terrestrial transmission/reception circuit is connected to the signal input/output circuit, the communication through the terrestrial wireless communication system can be carried out.

Variable delay circuit for delaying input data

Abstract: An address counter (2) counts the clock pulses sequentially to provide a count value as an address signal to a coincidence detecting circuit (3) and decoder (4). The coincidence detecting circuit (3) compares delay data applied from a delay data generating circuit (8) with the address signal and applies a reset signal to the address counter (2) when they coincide with each other. The address counter (2) repeats sequentially the above-mentioned operation in response to the reset signal after the count of address is reset to a predetermined value. The decoder (4) specifies a memory cell comprised in a memory device for performing a reading and writing operation in response to the address signal. The data output circuit (6) and the data input circuit (5) perform the reading and writing operation sequentially to the specified memory cell in response to the control signal outputted from the control circuit (7). As a result, the input data previously written is read and outputted with a delay. Therefore, a delayed input data can be obtained as an output data.