摘要:
A process for preparation of (R)-1,2-propanediol which comprises cultivating a microorganism belonging to genus Pseudomonas or genus Alcaligenes which has ability to assimilate (S)-1,2-propanediol as a single carbon source, in a culture medium containing racemic 1,2-propanediol as a single carbon source and then isolating the remaining (R)-1,2-propanediol from the culture broth.
摘要:
Indium phosphor (InP) Gunn diode that realizes improvements in thermal characteristics, yield factor of good products and easy assembly to planar circuits is provided. In a Gunn diode of the present invention, contact layers are interposing an active layer. An anode electrode and a cathode electrode are formed on the uppermost contact layer. A high resistance region around the cathode electrode is formed at least in an uppermost contact layer by ion implantation using the cathode and anode electrode as a mask. A region under the cathode electrode functions as a Gunn diode and a region under the anode electrode function as a conductive path from the anode electrode to the active layer. These two regions are defined by the high resistance region.
摘要:
ATM transmission equipment provided between existing exchange or terminals of carrier equipment that, for example, can emulate existing transmission paths, and also implement T point interfaces for an in-home unit. The ATM transmission equipment detects communication anomalies or extracts maintenance/operation information from data strings on STM lines, such as high-speed digital lines or ISDN lines, and replaces only the necessary information resulting from those extractions or detections with alarm signals. The alarm signals are then transmitted together with information channels to the ATM network via a cell assembler/dissembler. The information channels and alarm information that arrive from the ATM network are rearranged into STM line data strings and output to LT units, DSUs, or terminals.
摘要:
A DC power source unit includes a main unit that generates DC voltage, and an output cable. The output cable is connected, either integrally or detachably, at one end to the output of the main unit and another end to an adapter plug. The adapter plug is electrically connected to an electrically powered tool, such as an electrical drill. An output voltage switching unit switches the level of voltage supplied by the main unit to the electrically powered tool, to a level that matches the rated voltage of the electrically powered tool that corresponds to the fitting portion of the adapter plug.
摘要:
A semiconductor integrated circuit including a logic circuit having an insulated gate field effect transistor (IGFET) (352) with a reduced threshold voltage that may compensate for a reduced voltage supply is provided. The IGFET may receive a signal line (340) at a gate terminal and may provide a controllable impedance path between a signal line (320) and a node (ND). The logic circuit may include a stand-by mode in which the IGFET (352) may receive a potential at a source electrode that may be approximately equal to the potential at a drain electrode. In this way, leakage current may be reduced.
摘要:
A DC power source unit includes a main unit that generates DC voltage, and an output cable. The output cable has one end connected to the output of the main unit and another end attached to an adapter plug. The adapter plug Is electrically connected to an electrically powered tool, such as an electrical drill. Current flowing in the tool is detected every predetermined interval and accumulated electrical quantity is computed based on the detected current flowing in the tool. Based on the accumulated electrical quantity, the temperature of the tool is predicted. When it is determined that the tool is heated up to a first critical temperature based on the accumulated electrical quantity, an alarm unit is actuated. When it is determined that the tool is further heated up to a second critical temperature, supply of current to the tool is interrupted.
摘要:
A base layer interposed between an n-type GaAs collector layer and an n-type AlGaAs emitter layer is composed of a p-type InAlGaAs. From a collector/base interface to an emitter/base interface, an InAs composition of the base layer is decreased and a concentration of carbon as a p-type impurity thereof is increased so as to obtain a built-in internal field intensity in the base layer by a cooperative effect of the graded-bandgap and the impurity concentration gradient, thus reducing a base transit time of electrons. The base layer is fabricated according to MOMBE using TMG as a gallium source, controlling the InAs composition, so that a desired carbon concentration gradient is automatically formed. Thereby, a high performance, heterojunction bipolar transistor with an increased built-in internal field intensity in the base layer is obtained.
摘要:
A base layer interposed between an n-type GaAs collector layer and an n-type AlGaAs emitter layer is composed of a p-type InAlGaAs. From a collector/base interface to an emitter/base interface, an InAs composition of the base layer is decreased and a concentration of carbon as a p-type impurity thereof is increased so as to obtain a built-in internal field intensity in the base layer by a cooperative effect of the graded-bandgap and the impurity concentration gradient, thus reducing a base transit time of electrons. The base layer is fabricated according to MOMBE using TMG as a gallium source, controlling the InAs composition, so that a desired carbon concentration gradient is automatically formed. Thereby, a high performance heterojunction bipolar transistor with an increased built-in internal field intensity in the base layer is obtained.
摘要:
A dummy emitter (a dummy collector, in an inverted type) is formed in the portion corresponding to an emitter (a collector, in the inverted type) region, on a multiplayer structural material including layers for forming emitter, base and collector, and using it as mask, an external base region is exposed by etching, and a projection of the emitter (the collector, in the inverted type) region is formed, while the dummy emitter (the dummy collector, in the inverted type) is inverted into an emitter (a collector, in the inverted type) electrode, thereby forming an emitter (a collector, in the inverted type) electrode metal layer covering the whole upper surface of the emitter (the collector, in the inverted type). Using the thus formed emitter (the collector, in the inverted type) electrode metal layer, a base electrode metal layer is formed, by self-alignment, adjacent to the emitter (the collector, in the inverted type). In another method, on a multilayer structural material, impurities are introduced outside the portion corresponding to the base region of a bipolar transistor in order to insulate, at least, a portion of the layer forming the base, and if necessary a portion of the layer forming the emitter and a portion of the layer forming the collector. Further, an extension layers and the layer forming the collector, and an extension type dummy emitter (a dummy collector, in the inverted type) is formed which extends from the emitter (the collector, in the inverted type) on the base portion to the insulating region formed by transforming from the semiconductor material forming the base, and using it as mask, the external base region is exposed to form an emitter-including layer and the dummy emitter (the dummy collector, in the inverted type) is replaced by an emitter (a collector, in the inverted type) electrode metal layer covering the whole upper surface of the emitter-including layer.
摘要:
A paper based frictional material is formed by forming a paper material of a desired size from a mixture comprising wood pulp, a lubricant and an organic fiber; soaking said paper material in a binder agent, and then drying the soaked material; and heating said dried paper product to carbonize the same under conditions in which oxygen is substantially eliminated from contact with said paper material so that a material is obtained whose frictional characteristics are such that the material is useful as a clutch facing in automatic transmissions.