Abstract: A method of producing a cycloalkanone oxime by a photochemical reaction of a cycloalkane with a photo nitrosating agent in a liquid by light irradiation includes irradiating the liquid with a light source configured to emit light satisfying conditions that, in an emission energy distribution with respect to wavelength of light, a wavelength providing a maximum value of emission energy is 550 nm to 700 nm and a continuous wavelength range including the wavelength providing the maximum value and outputting energy of or over 5% of the maximum value is equal to or less than 150 nm, wherein a ratio ?E/V of a light irradiation energy ?E out of electric power E input into the light source to a reaction volume V which is a volume of a space for the photochemical reaction of the cycloalkane with the photo nitrosating agent is equal to or greater than 5.5 w/L.

Abstract: A method produces a cycloalkanone oxime by photonitrosation using light emitting diodes as the light source for the next generation that replaces an electric discharge lamp with, for example, mercury or sodium sealed therein. The method produces the cycloalkanone oxime by a photochemical reaction of a cycloalkane with a photo nitrosating agent in a liquid by light irradiation. The method uses a light source satisfying conditions that, in an emission energy distribution with respect to wavelength of the light source, a wavelength at which emission energy has a maximum value is in a range of 550 nm to 700 nm and a wavelength range outputting energy of or over 5% strength of the peak strength is equal to or less than 150 nm. An irradiation distance in the liquid is equal to or greater than 200 mm, and concentration of the photo nitrosating agent in the liquid is 0.1 mol % to 0.5 mol %.

Abstract: A method of producing a cycloalkanone oxime by a photochemical reaction of a cycloalkane with a photo nitrosating agent in a liquid by light irradiation includes irradiating the liquid with a light source configured to emit light satisfying conditions that, in an emission energy distribution with respect to wavelength of light, a wavelength providing a maximum value of emission energy is 550 nm to 700 nm and a continuous wavelength range including the wavelength providing the maximum value and outputting energy of or over 5% of the maximum value is equal to or less than 150 nm, wherein a ratio ?E/V of a light irradiation energy ?E out of electric power E input into the light source to a reaction volume V which is a volume of a space for the photochemical reaction of the cycloalkane with the photo nitrosating agent is equal to or greater than 5.5 w/L.

Abstract: A method produces a cycloalkanone oxime by photonitrosation using light emitting diodes as the light source for the next generation that replaces an electric discharge lamp with, for example, mercury or sodium sealed therein. The method produces the cycloalkanone oxime by a photochemical reaction of a cycloalkane with a photo nitrosating agent in a liquid by light irradiation. The method uses a light source satisfying conditions that, in an emission energy distribution with respect to wavelength of the light source, a wavelength at which emission energy has a maximum value is in a range of 550 nm to 700 nm and a wavelength range outputting energy of or over 5% strength of the peak strength is equal to or less than 150 nm. An irradiation distance in the liquid is equal to or greater than 200 mm, and concentration of the photo nitrosating agent in the liquid is 0.1 mol % to 0.5 mol %.

Abstract: A digital magnetic recording/reproducing apparatus comprising a unit for recording high-definition information including video information and audio information, which is based on a first high-definition television scheme, on a recording medium in accordance with a second high-definition television scheme, the first high-definition television scheme having a first data format of a first amount of information smaller than a second amount of information of a second data format of the second high-definition television scheme, the recording unit including a circuit for allocating a recording area corresponding to a difference between the first amount of information and the second amount of information as a free recording area on which any information is selectively recorded, to match the first amount of information with the second amount of information.

Abstract: A magnetic recording/reproducing apparatus includes a write head for recording a signal on a magnetic recording medium, a recording amplifier for supplying a recording current corresponding to the signal to the write head, a read head for reproducing the signal recorded on the magnetic recording medium, a reproducing amplifier for generating a reproduced current corresponding to the signal, an equalizer for correcting a waveform of a reproduced signal reproduced by the read head, a distortion detector for detecting signal distortion reproduced by the read head, thereby obtaining a distortion evaluation value, and a recording current adjusting section for adjusting a magnitude of the recording current in a direction to decrease the distortion (i.e., in a direction to decrease the recording current) on the basis of a detection output obtained by the distortion detector. An optimum recording current is always supplied to the write head in accordance with the degree of wear of the write head.

Abstract: A magnetic recording/reproducing apparatus includes a write head for recording a signal on a magnetic recording medium, a recording amplifier for supplying a recording current corresponding to the signal to the write head, a read head for reproducing the signal recorded on the magnetic recording medium, a reproducing amplifier for generating a reproduced current corresponding to the signal, an equalizer for correcting a waveform of a reproduced signal reproduced by the read head, a distortion detector for detecting distortion of signal reproduced by the read head, thereby obtaining a distortion evaluation value, and a recording current adjusting section for adjusting a magnitude of the recording current in a direction to decrease the distortion (i.e., in a direction to decrease the recording current) on the basis of a detection output obtained by the distortion detector. An optimum recording current is always supplied to the write head in accordance with the degree of wear of the write head.

Abstract: A digital phase locked loop circuit samples the reproduced analog signal of a digital signal at a sampling frequency larger than the bit rate of the digital signal, and arithmetically operates, by using data at a plurality of successive sampling points, an average phase of the reproduced signal in the range from a point where the reproduced signal crosses a reference level to a predetermined sampling point, and makes the phase locked loop control of the reproduced signal by using the operated average phase.