摘要:
A steel pipe having excellent corrosion resistance in an environment containing wet carbon dioxide and a small amount of hydrogen sulfide and having also excellent weldability is produced at a low production cost and with high productivity. The production method comprises heating to a temperature of 1,050.degree. to 1,300.degree. C. a slab containing, in terms of wt %, 0.01 to less than 1.2% of Si, 0.02 to 3.0% of Mn, 7.5 to 14.0% of Cr and 0.005 to 0.5% of Al, reduced C, N, P and S contents, at least one of Cu, Ni, Co, Mo and W, a balance of Fe and unavoidable impurities, and having an MC value of at least 0, finishing hot rolling within an austenite monophase temperature range, coiling the steel sheet as a hot coil having a sheet thickness of 3.0 to 25.4 mm, cooling the coil at a cooling rate of at least 0.01.degree. C./sec to at least 500.degree. C. to convert the steel sheet to a steel substantially consisting of martensite, reheating the steel to a temperature of 550.degree. C. to not more than an A.sub.c1 transformation point, holding it for at least 15 minutes, cooling the steel web to a normal temperature, cutting it into a predetermined width, and welding both ends of the steel by electric resistance welding while the steel coil is continuously shaped into a cylindrical shape.
摘要:
A magnetic marker comprising a plurality of magnetized fibers oriented substantially parallel to each other is attached to a fringe of ground fabric for production of felt in the form of an endless belt for detecting the travel of the ground fabric and changing various production parameters according to the number of turns which the ground fabric makes around a series of rolls for causing the movement of the ground fabric. Since the magnetic marker consists of extremely thin magnetized fibers, it can withstand the repeated piercing by needles which is required for the production of felt for the purpose of entangling the fibers of fiber web with the ground fabric.
摘要:
A compound of the formula ##STR1## wherein R.sub.1 is a hydrogen atom or a methoxy group, and A is a C.sub.1 -C.sub.4 alkylene group, or a pharmaceutically acceptable salt thereof. This compound is useful as a medicine, particularly as a lipoxygenase inhibitor for polyunsaturated fatty acids.
摘要:
A display device including a liquid crystal cell which comprises first and second transparent substrates spaced apart substantially in parallel from each other to form a gap therebewteen, a body of twisted-nematic liquid crystal filing the gap between the substrates, orientation means urging the liquid crystal molecules in the gap to orient in a first direction in the vicinity of the inner face of the first substrate and in a second direction in the vicinity of the inner face of the second substrate, the first direction being substantially perpendicular to the second direction, a pair of polarizer films one overlying the first substrate and the other underlying the second substrate, and at least one phase-shift film intervening between one of the first and second substrates and one of the polarizer films.
摘要:
Novel isoquinoline derivatives of the general formula ##STR1## wherein R represents a lower alkyl group, a lower cycloalkyl group, or a group of the formula ##STR2## in which R.sup.2 represents a hydrogen atom, a halogen atom, a methyl group, a trifluoromethyl group, a methoxy group, a methylamino group or a dimethylami no group;R.sup.1 represents a hydrogen atom or a lower alkyl group; andY represents a carboxyl group, a cyano group, a carbamoyl group, a lower alkoxycarbonyl group or a lower alkylaminocarbonyl group;or a salt thereof; a process for the production thereof.The above compound is useful as an anti-inflammatory and analgesic agent.
摘要:
A multi-beam scanning device is provided with a light source that emits a plurality of light beams, a polygonal mirror that deflects the light beams to scan, and an optical system that converges the deflected light beams on a plurality of objects to be scanned. The objects are arranged on a side, with respect to the polygonal mirror, in which the light beams scan, from a position closer to the polygonal mirror to a position farther from the polygonal mirror in order. The optical system further includes a plurality of optical path turning systems that turn optical paths of the deflected light beams, respectively. Each of the optical path turning systems includes a plurality of reflection surfaces, the numbers of the reflection surfaces of the optical path turning systems are all even, or odd.
摘要:
A multi-beam scanning optical system is provided with a plurality of laser diodes respectively emitting a plurality of laser beams, each of said plurality of laser diodes being accommodated in a casing, and a laser diode holding unit that holds the casings of the plurality of laser diodes. Heat generated by each of the plurality of laser diodes is conducted to each other through the casings of the plurality of laser diodes and the laser diode holding unit.
摘要:
A multi-beam scanning optical system is provided with a light source unit emitting a plurality of beams. The beams are incident on a polygonal mirror, and deflected thereby to scan in a predetermined scanning range. The scanning beam is incident an f&thgr; lens system. The f&thgr; lens system includes a plurality of lenses, and all the beams pass at least one of the plurality of lenses included in the f&thgr; lens system. The lens, which all the beams pass through, is formed as a single lens element made of single material. Further, the lens contributes to convergence of the beams in the main scanning direction.
摘要:
An antiferroelectric liquid crystal cell having a high-speed response and wide viewing angle characteristic free of an image sticking phenomenon is provided. This antiferroelectric liquid crystal cell is composed of an antiferroelectric liquid crystal material held between a pair of parallel substrates. The antiferroelectric liquid crystal material filled between the parallel substrates has such a characteristic that when a sinusoidal voltage value with a changing reference frequency is applied to the antiferroelectric liquid crystal cell, the imaginary part of the complex dielectric constant obtained by Fourier transform of the output voltage value output from the antiferroelectric liquid crystal cell has no local maximum value within the reference frequency range of 100 Hz to 5 kHz. In other words, this characteristic is similar to a characteristic such that when the real part and the imaginary part of the complex dielectric constant are plotted by using a Cole--Cole plot for each frequency, a characteristic curve having no local maximum value within the reference frequency range of 100 Hz to 5 kHz is obtained.
摘要:
A precision liquid crystal spatial optical modulator device capable of being controlled by electric signals is realized using fine structure electrodes below a thickness of a liquid crystal layer, bringing adjacent electrodes close to one another, and driving them interconnectedly so as to spatially and finely control both liquid crystal molecule layers oriented immediately below the driving electrodes and immediately below the electrode gaps. A fine structure optical diffraction grating capable of electronic control which improves pattern positional accuracy of a liquid crystal optical modulator devices, reduces a pattern formation error and improves an aperture ratio of the liquid crystal modulator device can realized.