Semiconductor light emitting device
    83.
    发明授权
    Semiconductor light emitting device 有权
    半导体发光器件

    公开(公告)号:US06356572B1

    公开(公告)日:2002-03-12

    申请号:US09268658

    申请日:1999-03-16

    IPC分类号: H01S534

    摘要: It is an object of the present invention to provide a semiconductor light emitting device capable of securing, in use of an optical information processing or an optical communication system, a low threshold and high efficiency operation as well as a high output characteristic. An active layer structure having a flatness and an interface acuteness of a quantum well structure improved by introducing a multi-period super lattice structure between a substrate for crystal growth and a light emitting layer area further to on a misoriented substrate sued to enhance a homogeneity of a semiconductor crystal. Further, a carrier confinement and a light confinement can be enhanced by providing a margin for design of the quantum well structure. According to the present invention, it is possible to realize a semiconductor laser element which can improve, as compared with a semiconductor laser device to which the present process is not applied, a threshold current and a slope efficiency, and which can achieve, as compared with an element not provided with a window structure, a high output characteristic with a maximum optical output enhanced.

    摘要翻译: 本发明的目的是提供一种半导体发光器件,其能够在光信息处理或光通信系统的使用中确保低阈值和高效率操作以及高输出特性。活性层 通过在用于晶体生长的衬底之间引入多周期超晶格结构和进一步在被取向以提高半导体晶体的均匀性的错误取向的衬底上的发光层区域而提高量子阱结构的平坦度和界面精度的结构 。 此外,通过为量子阱结构的设计提供余量可以增强载流子限制和光限制。 根据本发明,可以实现与不施加本工艺​​的半导体激光器件相比可以改善阈值电流和斜率效率的半导体激光器元件,并且可以实现相比之下 具有不具有窗口结构的元件,具有增强的最大光输出的高输出特性。

    Exhaust gas purification device for an engine
    84.
    发明授权
    Exhaust gas purification device for an engine 失效
    发动机废气净化装置

    公开(公告)号:US6021640A

    公开(公告)日:2000-02-08

    申请号:US201973

    申请日:1998-12-01

    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.

    摘要翻译: 根据本发明,提供一种用于具有排气通道的发动机的排气净化装置,该排气净化装置包括布置在排气通道中并具有上游端和下游端的催化剂,排气的净化比由 当催化剂的温度在预定的温度范围内时催化剂变得大于预定的比例,用于冷却催化剂的上游端的冷却装置,用于加热催化剂的下游端的加热装置,以及用于控制冷却装置的控制装置 以及加热装置,将该部分位于上游端和下游端之间的部分催化剂的温度保持在预定温度范围内。

    Method for purifying exhaust gas of an internal combustion engine
    86.
    发明授权
    Method for purifying exhaust gas of an internal combustion engine 失效
    一种内燃机排气净化方法

    公开(公告)号:US5850735A

    公开(公告)日:1998-12-22

    申请号:US711597

    申请日:1996-09-10

    摘要: According to the present invention, SO.sub.X in the exhaust gas of an internal combustion engine is absorbed by a sulfate absorbent which absorbs SO.sub.X in the exhaust gas when the temperature is lower than a releasing temperature and releases the absorbed SO.sub.X when the temperature becomes higher than the releasing temperature. When the exhaust gas temperature increases during the operation of the engine and reaches the releasing temperature, the temperature of the exhaust gas flowing into the sulfate absorbent is further raised to a predetermined temperature by supplying fuel to the exhaust gas passage upstream of the sulfate absorbent. The ratio of SO.sub.3 in the SO.sub.X mixture released from the sulfate absorbent changes in accordance with the temperature, and takes the highest value at a certain temperature (i.e., a peak temperature). Therefore, when the exhaust gas temperature is raised above the peak temperature, the ratio of SO.sub.3 in the SO.sub.X mixture released from the sulfate absorbent decreases as the temperature increases. In the present invention, the above-noted predetermined temperature is selected in such a manner that the ratio of SO.sub.3 at this predetermined temperature becomes lower than the ratio of SO.sub.3 at the releasing temperature. Therefore, when SO.sub.X is released from the sulfate absorbent, the amount of SO.sub.3, i.e., the amount of particulate matter released into the atmosphere can be maintained at a low level.

    摘要翻译: 根据本发明,内燃机废气中的SO x被吸收在温度低于脱模温度时吸收废气中的SO x的硫酸盐吸收剂,并且当温度变得高于 释放温度。 当发动机运转时排气温度升高并达到释放温度时,通过向硫酸吸收剂上游的排气通道供给燃料,进一步将流入硫酸盐吸收剂的废气升温至规定温度。 从硫酸盐吸收剂释放的SO x混合物中的SO 3的比例根据温度而变化,并且在一定温度(即峰值温度)下获得最高值。 因此,当废气温度升高到高于峰值温度时,从硫酸盐吸收剂释放的SO x混合物中的SO 3比随温度升高而降低。 在本发明中,以这样的方式选择上述预定温度,使得在该预定温度下的SO 3的比例低于在释放温度下的SO 3的比例。 因此,当SOX从硫酸盐吸收剂中释放出来时,SO 3的量,即释放到大气中的颗粒物质的量可以保持在较低水平。

    Exhaust gas purification system for an internal combustion engine
    90.
    发明授权
    Exhaust gas purification system for an internal combustion engine 失效
    内燃机废气净化系统

    公开(公告)号:US5365733A

    公开(公告)日:1994-11-22

    申请号:US60375

    申请日:1993-05-07

    摘要: An exhaust gas purification system for an internal combustion engine includes a dual passage portion having a first passage and a second passage which are connected in parallel to each other. In the first passage, a first catalyst constructed of lean NOx catalyst is located and further a second catalyst constructed of oxidizing catalyst or three-way catalyst is located downstream of the first catalyst. In the second passage, a third catalyst constructed of oxidizing or three-way catalyst is located. A flow switching valve is provided so as to switch the flow of exhaust gas between the first passage and the second passage. The flow switching valve is switched so that exhaust gas flows through the third catalyst when the engine is being warmed-up and flows through the first catalyst and the second catalyst after the engine has been warmed-up.

    摘要翻译: 用于内燃机的废气净化系统包括具有彼此平行连接的第一通道和第二通道的双通道部分。 在第一通道中,设置由贫NOx催化剂构成的第一催化剂,并且另外由氧化催化剂或三元催化剂构成的第二催化剂位于第一催化剂的下游。 在第二通道中,定位由氧化或三元催化剂构成的第三催化剂。 提供流量切换阀,以便在第一通道和第二通道之间切换废气流。 切换流量切换阀,使得当发动机被加热时废气流过第三催化剂,并且在发动机被加热之后流过第一催化剂和第二催化剂。