Mitsubishi Denki Kabushiki Kaisha

Mitsubishi Electric Corporation

Mitsubishi Chemical Corporation

Hokkaido University

Asahi-dow Limited

Toshio Hasegawa

Tsuyoshi Nishioka

Hirokazu Ishizuka

Wataru Ninomiya

Akio Hayashi

David William Johnson

Kichiya Tazaki

Shigeki Takeuchi

Masaya Fujisue

Takashi Sakakiyama

Takayuki Kawamura

Alexandre Soujaeff

Norimichi Kawabe

Jonathan Runnacles

Junnichi Abe

Kazufumi Nishida

Shigeki c/o National University Corporation Hokkaido University Takeuchi

Alexandre c/o National University Corporation Hokkaido University Soujaeff

The invention discloses a catalyst comprising a silica support, a modifier metal and a catalytic alkali metal. The silica support has a multimodal pore size distribution comprising a mesoporous pore size distribution having an average pore size in the range 2 to 50 nm and a pore volume of said mesopores of at least 0.1 cm/g, and a macroporous pore size distribution having an average pore size of more than 50 nm and a pore volume of said macropores of at least 0.1 cm/g. The level of catalytic alkali metal on the silica support is at least 2 mol %. The modifier metal is selected from Mg, B, Al, Ti, Zr and Hf. The invention also discloses a method of producing the catalyst, a method of producing an ethylenically unsaturated carboxylic acid or ester in the presence of the catalyst, and a process for preparing an ethylenically unsaturated acid or ester in the presence of the catalyst.

Catalyst and a process for the production of ethylenically unsaturated carboxylic acids or esters

The present invention is a catalyst comprising:

Catalyst, method for preparing catalyst, and method for producing unsaturated carboxylic acid and/or unsaturated carboxylic acid ester

The present invention is directed to realize a stable and highly-efficient quantum communication without being influenced by the jitter of the heralding signal. In regard to the quantum encryption transmitting apparatus, the pulse-driven heralded single-photon sourcegenerates a photon pair, outputs one photon of the photon pair, and outputs the other photon of the photon pair as a heralding signal. The timing adjustersynchronizes the heralding signal with a clock signal for pulse driving the pulse-driven heralded single-photon source, and outputs as a trigger signal. The quantum communication modulating unitimplements the signal modulation to a quantum signal, in timing with the trigger signal, and transmits the quantum signal to the quantum encryption receiving apparatusvia the quantum communication path. The heralding signal transmitting unittransmits the heralding signal to the quantum encryption receiving apparatusvia the heralding signal communication path. The clock signal transmitting unittransmits the clock signal to the quantum encryption receiving apparatusvia the clock communication path

Quantum communication apparatus, quantum communication system and quantum communication method

Provided is a quantum cryptography communication apparatus capable of preventing a go photon pulse from being phase modulated and also capable of freely selecting any repetitive frequency of a light source. In the quantum cryptography communication apparatus, a quantum receiver apparatus includes: a light source; an optical path loop having a multiplexing/interfering means for generating time difference twin photon pulses from the photon pulses of the light source and for multiplexing and causing interference between a signal optical pulse corresponding to a retrograde quantum and a reference optical pulse; a bypass optical path having a phase modulator for phase modulating only the received reference optical pulse; and a photon detector for observing the interfered light passed through the optical path loop, and a quantum transmitter apparatus includes: a polarized wave rotating means for rotating polarization planes of the twin photon pulses at a right angle in a non-reciprocal manner; a phase modulator for phase modulating and returning the signal optical pulse passed through the polarized wave rotating means, to the quantum receiver apparatus; and a beam attenuating means.

Quantum cryptographic communication apparatus

A qubit generating unit generates a qubit having a predetermined quantum state. A qubit encoding unit performs quantum encoding of the generated qubit. A first pseudo-random number generating unit generates a first pseudo-random number from secretly shared information, which has been secretly shared with the quantum receiving device in advance. A quantum modulator performs quantum modulation of the qubit on which quantum encoding has been performed based on the first pseudo-random number and sends the modulated qubit to the quantum receiving device. A second pseudo-random number generating unit generates a second pseudo-random number from secretly shared information which has been secretly shared with the above quantum sending device in advance synchronously with generation of the above first pseudo-random number. A qubit demodulator performs quantum demodulation of the qubit, which has been received from the quantum demodulator based on the second pseudo-random number,

Cryptographic communication apparatus

In case of the high-speed operation, it is difficult to ignore the time required for the voltage to rise to the level of voltage to be applied and the time to fall to 0V when the voltage is applied to the phase modulator. The first phase modulator and the second phase modulator are connected in parallel, and the optical path is switched by the switching unit of the control unit between the first optical switch and the second optical switch . The switching unit of the control unit supplies the phase modulation data stored in the phase modulation data memory to the first voltage generating unit or the second voltage generating unit to generate the voltage necessary for the phase modulation.

Phase modulator and phase modulating method

Paper coating compositions having an improved combination of properties are prepared by admixing, in the normal proportions and by conventional techniques, one or more conventional paper coating pigments with a particular type of synthetic polymer latex. In such compositions, the particular latex employed is alkali-sensitive and is prepared by emulsion polymerizing (A) from about 10 to about 90 parts by weight of a monomer mixture comprising, based upon the weight of such monomer mixture, (1) from about 10 to about 60 weight percent of an ethylenically unsaturated carboxylic acid monomer and (2) from about 40 to about 90 weight percent of a copolymerizable monoolefin compound in the presence of (B) from about 10 to about 90 parts by weight, on a polymer solids basis, of a copolymer latex comprising a monovinylidene aromatic monomer such as styrene and an open-chain aliphatic conjugated diene such as butadiene.

Paper coating composition of unsaturated acid and mono-olefin

Growing community of inventors

Tokyo, Japan

Toshio Hasegawa