摘要:
According to the present invention, there is provided an exhaust gas purification device for an engine having an exhaust passage, the device comprising a catalyst arranged in the exhaust passage and having an upstream end and a downstream end, a purification ratio of exhaust gas by the catalyst becoming more than a predetermined ratio when a temperature of the catalyst is within a predetermined temperature range, cooling means for cooling the upstream end of the catalyst, heating means for heating the downstream end of the catalyst, and control means for controlling the cooling means and the heating means to maintain the temperature of a portion of the catalyst, which portion is positioned between the upstream end and the downstream end, in the predetermined temperature range.
摘要:
In an exhaust gas purification device, an exhaust gas passage of a diesel engine diverges into two branch pipes and a particulate filter (DPF) is disposed in each of the branch pipes. The DPF uses a metallic substrate and NO.sub.x absorbent is attached to the wall of the paths in the DPF. Therefore, the DPF act as both a normal particulate filter and a NO.sub.x absorbent. During the operation of the engine, SO.sub.x, as well as NO.sub.x, in the exhaust gas is absorbed in the NO.sub.x absorbent in the DPF. An electronic control unit (ECU) monitors the amount of SO.sub.x absorbed in the DPF during the operation and, when the amount of SO.sub.x absorbed in one DPF increases, switches the exhaust gas flow to the other DPF. The ECU further performs the SO.sub.x recovery operation to release the absorbed SO.sub.x from the DPF. After completing the SO.sub.x recovery operation, the ECU performs the regenerating operation of the DPF in which the particulate matter trapped in the DPF is burned. Since SO.sub.x in DPF is already released by the previous SO.sub.x recovery operation when the regenerating operation of the DPF is performed, the growth of sulfate particle in the DPF does not occur even if the DPF is exposed to a high temperature lean air-fuel ratio atmosphere of the regenerating operation.
摘要:
A catalyst for purifying exhaust gases, which is composed of a catalyst substrate, a first porous support layer supporting barium as a NOx-occluding material and palladium, which is formed on the catalyst support, and a second porous support layer supporting platinum, which is formed on the first porous support layer. Platinum efficiently oxidizes nitrogen monoxide to be converted into nitrogen dioxide. Palladium is supported in a highly dispersed state even after endurance to act as inlet and outlet of barium for nitrogen dioxide or the like, whereby absorption and emission of nitrogen oxides can be performed smoothly, and accordingly, the purification performance for nitrogen oxides is improved.
摘要:
A soundproof type water-cooled engine generator is constructed to guide an exhaust current of air from a cooling fan of a water-cooled engine to an independent hood-like shroud chamber, deaden the current sound through a muffler located under the shroud chamber, for improving the cooling performance. A water-cooled engine 2 and a generator 3 are accommodated in a soundproof bonnet 1. A panel wall 8 is provided close to a fan 7 equipped in the water-cooled engine. The panel wall serves to partition the soundproof bonnet 1 into an engine and generator chamber 11 and an exhaust processing chamber 12. The panel wall has a hole having the substantially same diameter as the fan 7. Around the outside of the hole, a shroud chamber 17 is independently provided in the exhaust processing chamber. The shroud chamber 17 is formed by a hood-like encircling wall 14. On the lateral side of the shroud chamber, a radiator 13 is located to stand upright. A muffler is located under an exhaust duct chamber 18 so that the exhaust is discharged from the upper portion of the exhaust duct chamber.
摘要:
Apparatus for measuring liquid aldehydes includes a liquid sample pouring mechanism for dividing a liquid sample which contains aldehydes into a formaldehyde measuring liquid sample and a total aldehyde measuring liquid sample and pouring the liquids separately from each other; a formaldehyde measuring mechanism for measuring the liquid formaldehyde in the formaldehyde measuring liquid sample; a total aldehyde measuring mechanism for measuring the liquid aldehydes in the total aldehyde measuring liquid sample; and a formaldehyde ratio calculating mechanism for calculating the ratio of the formaldehyde to the total aldehyde from the results of the measurements of the respective aldehyde measuring mechanisms.
摘要:
First and second tape-pulling members comprise slanted posts and guide rollers adapted for engagement with the tape contained in a tape cassette. By the slanted posts and guide rollers, the first and second tape-pulling members pull the tape out of the tape cassette. Each of the guide rollers includes a tape-winding portion around which the tape is to be wound. First and second holding members are provided at positions where the tape loading by the first and second tape-pulling members is completed. Tape control portions, by which the tape disengaged from the guide rollers are controlled, are formed on the first and second holding members, respectively, such that they are located on the tape-outlet sides of the guide rollers of the first and second tape-pulling members, i.e., on the side closer to a cylinder. Each of the tape control portions is substantially at the same level as the corresponding tape-winding portions of the guide rollers.
摘要:
A method and apparatus for assessing the odor intensity of combustion gas produced from an internal combustion engine in which the odor intensity of combustion gas is obtained from the pH-value of an aqueous solution prepared from odor-producing substances, based on a predetermined relationship between pH-value and odor intensity. The odor intensity thus obtained strongly correlates with organoleptically evaluated odor intensity. Since the odor intensity of the gas is determined from the pH-value, the precision and the reliability of the odor intensity measurement are enhanced.
摘要:
A first ohmic electrode of a light emitting diode is put into contact with an electrode plate, and a second ohmic electrode of the same is put into contact with a mesh electrode formed by a metal net. The mesh electrode is mounted on a light receiving surface of the light receiving element. When a predetermined amount of current is supplied from a power source to the mesh electrode and electrode plate, light is emitted from that portion of the light emitting diode located around the second ohmic electrode, and the light passes through the spaces of the mesh electrode, then being received by the light receiving element. The light receiving element supplies an electric signal indicative of the light to a measuring circuit, whereby the output of the light emitting diode is measured.
摘要:
A semiconductor light emitting device has a semiconductor light emitting element section and an n-type semiconductor substrate with a through hole which serves as a window through which light generated by the semiconductor light emitting element section is emitted. The device further includes a p-type region formed in the semiconductor substrate and facing the through hole. The p-type region and the semiconductor substrate constitute a photodiode.
摘要:
The present invention provides an immersion oil for microscopy, especially suitably a fluorescence microscopy which is superior in properties required for immersion oil for microscopy. This immersion oil comprises a phthalic acid dialkyl ester and a chlorinated paraffin.