摘要:
A feeding system is provided for supplying a current to repeaters on a communication cable including a feed line for conducting a current to the repeaters. The feeding system includes a plurality of branching units provided on the communication cable and terminal stations each being connected through at least one of the repeaters to one of the branching units, and each of the terminal stations feeding a current through the feed line to the repeaters. In addition each of the plurality of branching units includes at least one switching circuit for switching to connect the at least one of the repeaters to the communication cable or to the ground, depending on the amount of current conducting through the feed line in the communication cable. Further, the current thresholds of the switching circuits in the plurality of branching units are preferably different from each other.
摘要:
A submarine cable branching system includes a plurality of directional relays in respective power feed paths branched at a common node, each of the directional relays being energized by a current flowing through the power feed path in a predetermined direction for energizing a corresponding switch provided in a different power feed path to establish a bilateral feed path and further a unilateral feed path, wherein there is provided a bypassing switch across one of the switches that forms the bilateral feed path, such that the bypassing switch is urged to close in response to energization of a self-sustaining relay provided in the unilateral feed path.
摘要:
A transmission line between terminals of a three-terminal station is branched by a branching unit and power is transmitted between the terminals of the three-terminal station and a power feed system in the transmission line including: a switch for switching a power feed line feeding power to a repeater between a both-end power feed mode and a single-end power feed mode; and connection holding means for holding a power feed connection state without change upon an occurrence of a failure.
摘要:
According to one embodiment, there is provided a rotating electrical machine including a core, a coil extending from the core, and an electromagnetic shield which is provided outside the core, and has a plurality of shoulders projecting toward the coil. The coil includes an insulator covering outside of a conductor, a resistance layer formed on a surface of the insulator and contacting the core, and at least one potential grading layer formed on a surface of the insulator adjacent to the resistance layer. A boundary between the resistance layer and potential grading layer is provided at a position farther from the core than a point on a surface of the coil, where a distance between the coil and a shoulder of the electromagnetic shield closest to the core is the shortest.
摘要:
Disclosed is a stainless steel containing, by mass, 0.05% or less carbon, 1.5 to smaller than 3.5% Si, 3.0% or less Mn, 6.0 to 12.0% Cr, 4.0 to 10.0% Ni, 10.0% or less Co, 6.0% or less Cu, 0.5 to 3.0% Ti, 0 to 2.0% Al, not more than 1.0% Mo, not more than 0.01% nitrogen, and the balance of Fe and unavoidable impurities. Preferably, it has a hardness of not lower than 59 HRC and may contain not more than 1.0% Nb and/or not more than 1.0% Ta. Alternatively, the stainless steel may further contain not more than 0.1% of Zr. The process for producing the steel includes producing a steel having a composition as described above by a consumable electrode remelting process, and then subjecting the steel to a solution treatment at a temperature of 1000 to 1150° C. and an aging treatment at a temperature of 400 to 550° C., thereby aging the stainless steel to a hardness of not lower than 59 HRC.
摘要:
An imaging apparatus of the invention comprises: an image pickup device for picking up object light; a mirror section for switching an optical path of the object light; a retaining member for retaining at least the mirror section; and a shake detection section for detecting a shake of the image pickup device, wherein the shake detection section is provided in a member separate from but indirectly connected to the retaining member via a predetermined connection section. The shake detection section is attached to the separate member connected indirectly to the retaining member that retains the mirror section and hence receives directly a vibration at the time of driving of the mirror section, with the intervention of the connection section. This avoids that the vibration caused by the driving of the mirror section is directly transmitted to the shake detection section. That is, the vibration is bypassed and damped along a route going through the connection section. This minimizes the influence on the shake detection in the shake detection section. As a result, a clear,photographed image is obtained on the basis of the shake correction.
摘要:
A crystalline silicon carbide fiber excellent not only in mechanical properties but also in alkali durability at high temperatures, which has a density of at least 2.7 g/cm.sup.3, contains 55 to 70% by weight of Si, 30 to 45% by weight of C, 0.06 to 3.8% by weight of Al and 0.06 to 0.5% by weight of B, the total of these elements being 100% by weight, and has a sintered structure of SiC.
摘要翻译:优异的结晶碳化硅纤维不仅具有机械性能而且在高温下的耐碱性,其密度为至少2.7g / cm 3,其含有55〜70重量%的Si,30〜45重量%的C ,0.06〜3.8重量%的Al和0.06〜0.5重量%的B,这些元素的总量为100重量%,并且具有SiC的烧结结构。
摘要:
A camera, which is waterproof, having a relatively complicated three-dimensional configuration in which a cover thereof is constituted by a plurality of cover elements. A top cover 20, a front cover 30 and a side cover 40 are connected at the inside to form a first cover group. Then a main body 50 of the camera is connected to the first cover group to form a half completed body. A second cover group which is constituted by connecting a rear cover 60 to a bottom cover 70, and a lid 80, are connected to the half completed body. Each connection part therebetween has a rib and a groove corresponding to the rib. A packing is inserted into the groove to seal the groove and rib. Thus, a cover structure with a relatively complicated three-dimensional configuration as having a projecting grip, a pop-up flash, or the like, is possible to be made. At time of repair, for example, it is possible to get an access to the inner mechanisms of the camera, only by removing the second cover group from the camera body.
摘要:
A step-down switching regulator prevents an output voltage undershoot and enables a quick lowering of an output voltage immediately after turning off of power supply. The step-down switching regulator includes an NMOS transistor connected between an output terminal and a ground voltage and another NMOS transistor connected in parallel with a synchronous rectification transistor. Upon reception of an on/off signal for terminating the operation of the switching regulator, the NMOS transistors are turned on into an on-state.
摘要:
A disclosed boost DC/DC converter includes a direct-current power source, of which a negative terminal is connected to ground; an inductor connected to a positive terminal of the direct-current power source; a first switching element connected between the inductor and ground and having a control node for controlling an on-resistance thereof; a second switching element connected in series to the inductor and having a control node for controlling an on-resistance thereof; a smoothing capacitor connected between the second switching element and ground; a switching circuit configured to select a voltage of the direct-current power source during a start-up phase, and to select an output voltage of the smoothing capacitor after the start-up phase; and a control unit configured to cause the switching circuit to apply the voltage selected by the switching circuit to the control node of each of the first and the second switching elements at a predetermined cycle.