摘要:
A process for producing a polyhydric alcohol which comprises subjecting formaldehyde and a specific aliphatic aldehyde to an aldol condensation reaction in the presence of a base catalyst, and then subjecting the resultant reaction product to a crossed Cannizzaro reaction, while separating 2-alkenal formed as a byproduct during the aldol condensation reaction, prior to the completion of the crossed Cannizzaro reaction. Also a process for producing a polyhydric alcohol which comprises reacting formaldehyde with a 2-alkenal, such as that obtained in the aldol condensation reaction, in the presence of a base catalyst, then subjecting the resultant reaction product and a specific aliphatic aldehyde to an aldol condensation reaction, and subsequently subjecting the resultant reaction product to a crossed Cannizzaro reaction. The processes provide a polyhydric alcohol in high selectivity with a minimum excess of formaldehyde, without substantially by-producing a 2-alkenal.
摘要:
An outboard motor is equipped with an engine, an engine holder, an oil pan disposed below the engine in a state of the outboard motor being mounted to a hull, a water pump disposed below the oil pan, and a cooling water passage structure. The cooling water passage structure includes a vertical cooling water passage vertically passing through inside the oil pan and communicated with the side of the engine, a lateral cooling water passage extending in a lateral direction along a bottom surface of the oil pan, a cooling water supply pipe extending upward from the water pump and connected to a side of the engine, and a water pressure relief valve provided for the lateral cooling water passage for controlling a pressure increasing of the cooling water. The lateral cooling water passage has one end communicated with a lower end of the vertical cooling water passage and has another one end to which an upper end of the cooling water supply pipe is connected.
摘要:
An improved liquid crystal device and manufacturing method for same are described. In the device, a pair of substrates, between which a liquid crystal layer is disposed, is joined with pillars inbetween functioning as spacers which are provided of photocurable resin by photolithography. With this stucture, the spacers can be in surface contact with the inside surfaces of the substrates on which electrode arrangement and active devices are formed.
摘要:
A pattern generator is responsive to a control signal so as to change a pulse signal pattern selectively supplied through a level-shift circuit to switching elements of a charge-pump circuit, and the switching elements cause boosting capacitors to be differently charged depending upon the pulse signal pattern so that all the boosting capacitors participate in the boosting operation regardless of the target ratio between the input potential and the output potential.
摘要:
A device for recording/reproducing a digital pattern as a sound track of a cinefilm is disclosed. The device includes a cinefilm 1 having an image recording area 2 in which an image is recorded, a perforation section 3 for film feed and digital pattern data recording areas 5 and 6 provided in the vicinity of the perforation section 3. Plural channels of audio data are recorded as the digital patterns in the digital pattern data recording areas.
摘要:
A process for producing ditrimethylolpropane which comprises reacting trimethylolpropane, 2-ethylacrolein, and formaldehyde in the presence of a basic catalyst. Ditrimethylolpropane is produced efficiently and industrially advantageously.
摘要:
An optical pickup device for condensing the light from a light source on a signal recording surface of an optical recording medium, such as an optical disc. A semi-spherical lens of the optical pickup device has a surface 9b facing an optical disc 20 and has a pre-set refractive index. The optical pickup device also has a slider 12 adapted for securing the lens 9 and for being in sliding contact with an optical disc 20, and a spring plate 13 adapted for thrusting and supporting the slider in sliding contact with the optical disc 20. With the optical pickup device, high density reproduction may be realized, while the tolerance value for warping during disc molding or the tolerance value for warping due to moisture absorption may be increased. In addition, the production yield and the degree of freedom in selecting the disc materials may be improved.
摘要:
A television conversation/monitoring system connecting a central station and a plurality of terminal stations through an ISDN line. The central station has a picture/sound conversation/monitoring device, a picture input/output device, a sound input/output device, a system control portion and an ISDN line terminal device, and each of the terminal stations has a picture/sound conversation/monitoring device, a system control portion, a picture input/output device, a sound input/output device, a terminal station state change detecting device and an ISDN line terminal device. The central-station-side system control device has a function to control the line capacity, so that conversation and monitoring can be performed with a plurality of terminal stations simultaneously while the line capacity is changed in accordance with the state of terminals.
摘要:
A video conversation/monitoring system having a remote monitoring function includes a center station and multiple end stations linked through the ISDN network. The center station includes a video conversation/monitoring circuit, video input device, video output device, audio input device, audio output device, system controller, facsimile, and ISDN line terminating unit. Each end station includes a video conversation/monitoring circuit, system controller, first video input device, second video input device, audio input device, audio output device, calling device, first notification device, second notification device, detection device, facsimile, and ISDN line terminating unit. Based on the remote monitoring function of the video input device and the remote control function of the system controller for switching the video input device, various guidance services are accomplished in addition to the video-phonic conversation service. The integrated unit enables easy desk-top installation, the application of the ISDN network reduces the communication cost, and the provision of various state detection devices in the end stations enables image-based monitoring and state monitoring in addition to the conversation.
摘要:
An image forming apparatus includes an opening portion that opens toward a photosensitive body and has a stagnant portion in which discharge products produced by a discharging means stagnate. A partition member is disposed in the vicinity of an opening of the opening portion, the opening opposing a photosensitive body, the partition member preventing discharge products that fall from the stagnant portion from falling directly into contact with the photosensitive body.