摘要:
In a method for fabricating a semiconductor laser device, a plurality of grooves are formed in a surface of one conductive type of an InP layer. The InP layer is thermally treated in an atmosphere including at least a gas containing phosphorus and a gas containing arsenic in a mixed state, thereby forming a plurality of active regions made of InAsP in the plurality of grooves. An other conductive type of semiconductor layer is formed after the active regions are formed.
摘要:
A semiconductor laser device includes an InP substrate and a multi-layered structure formed on the InP substrate, wherein the multi-layered structure includes at least a plurality of active regions for outputting a laser beam, and the plurality of active regions each are provided in each of a plurality of grooves dented toward the InP substrate.
摘要:
A heat exchanger which includes a turbulence promoter interposed between inlet and outlet ports of the heat exchanger and spring means made of a memory alloy for moving the turbulence promoter in a predetermined direction. The area of the heat transfer surface in which the heat transfer coefficient or the unit thermal conductance is increased by the turbulence promoter is changed in accordance with movement of the turbulence promoter. As a result, the heat exchanger effectiveness or temperature effectiveness is intentionally changed and the temperature at the outlet port of the heat exchanger is maintained within a certain range of temperature.
摘要:
A pump speed detecting device for diverse purposes in connection with various actuating devices disposed upon motor vehicles includes a pump, driven by a variable speed prime mover, for supplying fluid from a reservoir and discharging the same, at a flow rate proportional to the number of revolutions thereof, into a first conduit which is fluidically connected to a fluid motor. A flow control valve is fluidically connected to a first conduit so as to direct fluid from the first conduit into a second conduit which is in turn fluidically connected to the reservoir or the suction side of the pump. A first restriction is provided within the first conduit between the flow control valve and the fluid motor so as to control the flow control valve in response to the flow from the pump to the fluid motor. A second restriction is provided within the second conduit, and the actuating device is fluidically connected to the second conduit at a position just ahead of the orifice. Therefore, the actuating device is actuated by means of the fluid pressure which pressure increases as the number of revolutions of the pump increases.
摘要:
A semiconductor laser includes a substrate; and a multilayered film formed on the substrate and including an active layer. The multilayered film includes a stripe structure that extends in a longitudinal direction of a resonator and has a tapered portion in which a width of a stripe changes in a tapered manner; and a first side face and a second side face that sandwich the stripe structure. At least one side face of the first side face and the second side face is inclined with respect to a principal surface of the substrate.
摘要:
A disc rotor formed of flaky graphite cast iron in which the natural frequency of the disc rotor is set by the graphite length in the flaky graphite cast iron structure.For preventing resonant vibrations ascribable to the self-excited vibrations of the component parts of disc brakes, such as pads, the natural frequency of the disc rotor are shifted from the frequency of excited vibrations of the component parts of disc brakes, such as pads.
摘要:
A strained multiple quantum well semiconductor laser including a semiconductor substrate, a multiple quantum well active layer including a plurality quantum well layers and a plurality of barrier layers, and a multilayer structure including the above multiple quantum well active layer is provided. Each barrier layer is interposed between two of the multiple quantum well active layers. The multilayer structure is formed upon the semiconductor substrate. Herein, at least one of the plurality of barrier layers is thicker than the other barrier layers, thereby serving as a layer absorbing strain which is stored in the barrier layers due to a difference between the lattice constant of semiconductor substrate and the lattice constant each quantum well layer.
摘要:
A hydraulic pressure control valve assembly in a hydraulic brake system on a powered and wheeled vehicle having a self-contained hydraulic pressure source, preferably in the form of a pressure accumulator, said assembly being characterized by that the assembly is formed with a hydraulic pressure chamber and a slidable piston in the latter, an axial bore is formed through said piston, an elongated valve slide is slidably mounted in said axial bore, a valve part is formed on said valve slide, said valve part is so designed and arranged that the hydraulic live pressure coming from said pressure source may be applied on the both sides of said valve part when the latter is receded from a mating valve seat for practically balancing out the effect of said live pressure upon said valve part under occasional demand, said axial bore being provided in the hydraulic system extending from said pressure source and a reservoir and said valve being adapted for interruption of said hydraulic system when a manually operated braking member is actuated in its brake applying sense.
摘要:
In a distributed feedback semiconductor laser includes an InP substrate and a multiple layer structure formed on a main surface of the InP substrate, the multiple layer structure includes at least an active layer for emitting laser light and a periodical structure for distributed feedback of the laser light, and the periodical structure includes a plurality of semiconductor regions each having a triangular cross section in a direction perpendicular to the main surface of the InP substrate and parallel to a cavity length of the distributed feedback semiconductor laser, the triangular cross section projecting toward the InP substrate.
摘要:
A heat exchanger for recovering heat from exhaust gases which includes a plurality of separately divided portions, a fluid passage mechanism for a fluid disposed within each of the portions, a bypass mechanism for the fluid for bypassing each of the portions and a valve mechanism for selectively operating the fluid passage mechanism or the bypass mechanism. The plurality of portions may constitute at least two chambers separately provided in the heat exchanger or at least two parts independently provided ion the heat exchanger. In addition, discharge means for discharging the fluid in the plurality of portions is provided.