Abstract: Calcium-iron oxide composite particles of the present invention have a BET specific surface area of 0.1 to 100 m2/g and containing iron atom in an amount of 1 to 500 moles based on 100 moles of calcium atom, the iron atom of not less than 50% based on the total amount of iron atom contained in said calcium-iron oxide composite particles being bonded with calcium atom for forming a calcium-iron ferrite phase. A hydrogen chloride-scavenger comprising the calcium-iron oxide composite particles, is capable of effectively capturing harmful hydrogen chloride generated by thermal decomposition or combustion of chorine-containing resin molded products upon fire or incineration thereof, and fixing the hydrogen chloride as stable calcium chloride or the like.

Abstract: A dust-removing synthetic resin filter of the present invention comprises a filter material which comprises: synthetic resin fibers; and iron oxide particles having a catalytic activity to chlorine or hydrogen chloride gas. Such a dust-removing synthetic resin filter is capable of so-called clean combustion which is free from discharge of harmful substances upon incineration thereof and is advantageous from the standpoint of preventing environmental pollution.

Abstract: A method of decoloring a colored concrete, comprises adding to the colored concrete, a decoloring pigment comprising a titanium oxide pigment, or a titanium oxide pigment and a pigment having a complementary color relative to color of the colored concrete. Such method can decolore the color of the colored concrete residue which attaches to or remains in production facilities in order to return a color thereof to that of an ordinary plain concrete, without works or treatments for washing-out or removing the colored concrete residue which attaches to or remains in the production facilities, in which the works or treatments are required in the case where the production facilities are used for the production of an ordinary plain concrete after the colored concrete has been produced therein, and without works or treatments for purifying a waste water generated upon washing-out or removing the residue and for making the waste water harmless; and a pigment used therefor.

Abstract: The disclosure described a material having a damping property, comprising 100 parts by weight of a binder resin composed of 85 to 99% by weight of at least one base resin selected from the group consisting of polypropylenes, polystyrenes, acrylonitrile-butadiene-styrene copolymers, polycarbonates, polyphenylene ethers and modified polyphenylene ethers and 1 to 15% by weight of styrene-isoprene-styrene block copolymer, and 1 to 20 parts by weight of iron compound particles.

Abstract: The present invention relates to the new thielocin derivatives, which exhibit phospholipase A.sub.2 inhibitory activity of the formula: ##STR1## wherein R.sup.1, R.sup.2, R.sup.3, R.sup.4, R.sup.5, R.sup.6, R.sup.7, and R.sup.8 are independently hydrogen, lower alkyl, lower alkoxy, hydroxy, or halogen;E.sub.1 and E.sub.2 are independently hydrogen, or an ester residue;m and n are independently an integer of 0 to 4;--Y-- is a bivalent group which is selected from the group consisiting of the following radicals: ##STR2## or the salts thereof.

Abstract: The present invention is a self-fusion type damping material formed from hard ferrite powder as a filler with a binder, in which the binder comprises an ethylene-vinyl acetate copolymer and a petroleum resin and 100 parts by weight of the combined binder and 150 to 600 parts by weight of the filler are mixed, or a self-fusion type damping material formed from hard ferrite powder and an auxiliary filler as a filler, if necessary, with a binder, in which the binder comprises an ethylene-vinyl acetate copolymer and a petroleum resin and 100 parts by weight of the combined binder and 100 to 600 parts by weight of said combined filler, in which the amount of said hard ferrite powder is in the range of 50 to 400 parts by weight and that of said auxiliary filler is in the range of 1 to 200 parts by weight, are mixed.

Abstract: The present invention relates to the compounds of the formula: ##STR1## in which R.sup.1, R.sup.2, R.sup.3, R.sup.4, R.sup.5, R.sup.6, R.sup.7, and R.sup.8 are independently hydrogen, lower alkyl which is optionally substituted, lower alkoxy which is optionally substituted, hydroxy, acyloxy, or halogen; R.sup.9 is hydrogen, hydroxy, acyloxy, lower alkyl which is optionally substituted, lower alkoxy which is optionally substituted, or lower alkylamino which is optionally substituted; E.sup.1 is hydrogen, or an ester residue; m is an integer of from 1 to 4;or a pharmaceutically acceptable salt thereof. The compounds of the present invention exhibit phospholipase A.sub.2 inhibitory activity, and can be used in treating inflammatory conditions.

Abstract: A specific magnetic particle powder is described, which is included in magnetic toners used for magnetic image character recognition (MICR). The magnetic particle powder is a magnetite particle and distinguished by the facts that its residual magnetization is of 12 to 20 emu/g, its Fe.sup.2+ content is of 18.5 to 22.5% by weight, its surface is deposited with Si or Al oxide or mixture thereof and its specific surface area is of 3.5 to 9.5 m.sup.2 /g. The magnetic particle powder used as one component of the magnetic toner enables the formation of fine accurate images and the exact detection of the image.

Abstract: Disclosed herein is a damping material comprising:(a) a binder composed of 100 parts by weight of an ethylene-vinyl acetate copolymer containing 30 to 65 wt % of vinyl acetate, and 160 to 330 parts by weight of a petroleum resin containing an aromatic petroleum resin as the main ingredient; and(b) 30 to 180 parts by weight of a filler composed of a scaly powder.

Abstract: Disclosed herein are magnetic particles for a magnetic toner containing a low-molecular binder resin having a weight-average molecular weight of not more than 150,000, said magnetic particles comprising particulate magnetic particles containing iron as the main ingredient and having an oil absorption of not more than 24 ml/100 g and a degree of compaction of not less than 56, and a magnetic toner containing the said magnetic particles.

Abstract: Disclosed herein is magnetic particles containing iron as the main component which have an average particle diameter of 0.1 to 3.0 .mu.m and a liquid absorption of not more than 18 m.infin..

Abstract: A data recording and reproducing apparatus promotes error-free and speedy exchange of data between separate recording media. When desired primary data is to be recorded on a master recording medium, secondary data is added to the primary data in order to detect and correct data errors. The primary and secondary data are recorded on the master recording medium in a plurality of series which differ in recording sequence from each other. The primary data is reproduced from the master recording medium together with the secondary data for the different series at the same time, regardless of their recording sequences. The reproduced primary data is allowed for error check and correction based on the secondary data and is recorded in the slave recording medium.

Abstract: A method and apparatus for digital magnetic recording of data in which digital data is recorded on a magnetic recording medium after being demodulated by the NRZI (Non-Return-to-Zero Inverted) system and read thereoutof timed to magnetic flux reversal caused by the recorded data on the recording medium. The digital data is encoded in a predetermined manner before the NRZI modulation so that at least part of "false" bits contained in the digital data is converted into "true" bits, resulting in an increase in the number of "true" bits. The encoded data is written into the recording medium after the NRZI modulation. In the event of reproduction of the data from the recording medium, self-clocking occurs to generate a data readout timing. The increased number of "true" bits insures desirable self-clocking. The data read from the recording medium is decoded to the original digital data.

Abstract: A digital signal having a configuration of blocks or frames is recorded via a multi-track record on a first group of tracks, such as odd tracks, of a master tape which is driven at a first direction. Then when recording another digital signal by forming a second group of tracks, such as even tracks, in a second direction which is opposite to the first direction, the digital signal prerecorded on the first group of tracks is derived to produce a speed signal indicative of the tape speed at which the digital signal was recorded on the first group. The speed signal is then compared with a reference signal having a predetermined frequency for producing a control signal, which is used to control the driving speed of the master tape. Thus the second group of tracks is formed with the running speed of the master tape being controlled. As a result, the phase difference between the first and second groups of tracks is constant throughout the entire length of the master tape.

Abstract: A digital signal comprising a plurality of data blocks each comprising a plurality of data words and a parity word is transmitted without a synchronous word or signal indicative of the boundary between two consecutive data blocks. The parity word comprises a plurality of bits each generated from bits of a corresponding row in the original data words in the data block. When receiving the digital signal, the digital signal is first stored in a memory and a plurality of sets of bits in each row is read out to provide parity checking. As a result of parity checking, absence of parity error will be detected in connection with a particular set of bits, and this particular set of bits in each row can be treated as a single row constituting the original data block.

Abstract: Each block of data having information data and redundant bits is transmitted without any synchronous signal bit word, while transmitted data is processed to find the boundary between consecutive data blocks so that a synchronous signal will be produced at the receiving end. The system for producing the synchronous signal comprises a cyclic redundancy check (CRC) circuit, a frequency divider for dividing the frequency of shift clock pulses and a reset pulse generating circuit. The reset pulse generating circuit is responsive to the output signal from the frequency divider and the shift clock pulses to produce periodically first and second reset pulses with which the CRC circuit and the frequency divider are initialized. The reset pulse generating circuit is further responsive to an error signal from the CRC circuit so that further first and second reset pulses are produced with which the CRC circuit and the frequency divider are initialized again.

Abstract: A system for obtaining synchronized reproduction from a plurality of reproducing apparatuses by obtaining mutually synchronized reproduced signals from a plurality of reproducing apparatuses, where the plurality of reproducing apparatuses respectively reproduces recorded signals from a recording medium in which mutually identical address signals are recorded for each predetermined data signal block.

Abstract: A data acquisition circuit is adapted to receive information data, a synchronization pulse and a clock pulse which is transmitted at twice as high as the transmission rate of the information data. The clock and synchronization pulses are processed into a conditioning pulse for a divide-by-two frequency divider so that it conditions the divider to respond to the clock pulse by generating a data acquisition pulse at a frequency corresponding to the transmission rate of the information data in a correct phase relationship therewith.

Abstract: A signal processing circuit has a circuit organization having a pair of crosstalk circuits respectively including at least delay circuits each of a delay time .tau. and adapted to add or cancel crosstalk components to or in input signals in correspondence with the transfer characteristics between sound sources and the two ears of a listener. Each crosstalk circuit has means for attenuating components of frequencies represented by (2n-1/2.tau.) (where n is a positive integer).

Abstract: A phase-shifting circuit comprises a first transistor circuit having a base to which an input signal is applied, first and second resistors of equal resistance values connected mutually in series and between an emitter of the first transistor circuit and ground, a third resistor connected at one terminal thereof to the emitter of the first transistor circuit, a capacitor connected between the other terminal of the third resistor and ground, and a second transistor circuit having a base connected to said other terminal of the third resistor and an emitter connected to the junction between the first and second resistors, an output signal being led out from a collector of the second transistor circuit.