摘要:
A junction field effect transistor has a first conductivity type substrate with high impurity concentration, a first conductivity type layer with low impurity concentration which is layered on the substrate, a first region of first conductivity type and with high impurity concentration which is formed in the surface region of the layer, and a second region of second conductivity type and with high impurity concentration which is formed in the surface region of the layer, substantially surrounding the side wall of the first region. The thickness of the layer is within the range from 4.0 to 6.0 .mu.m. The minimum width of the portion surrounded by the second region and the impurity concentration of the layer fall within the area with four corners A, B, C and D where these corners correspond to the four coordinates (log.sub.10 4.times.10.sup.15, 2.0), (log.sub.10 18.times.10.sup.15, 1.2), (log.sub.10 18.times.10.sup.15, 0.5) and (log.sub.10 4.times.10.sup.15, 1.1) of a rectangular coordinates of which the Y-distance represents the minimum width and the X-distance is the impurity concentration in the logarithmic scale.
摘要:
In a method for manufacturing a junction type field-effect transistor, there is formed a gate region having one portion over which a source electrode extends and the other portion which allows an essential gate function. These portions are formed by diffusing impurities through openings of different masks.
摘要:
A logic circuit comprises four NAND or NOR gates. The first and second gates are cross-coupled and the third and fourth gates are also cross-coupled. The outputs of the first and second gates are coupled to the inputs of the third and fourth gates respectively. Complementary clock pulses are respectively supplied to the first and second gates and the third and fourth gates, and first and second logic inputs are applied to the inputs of the first and second gates, respectively.
摘要:
An Ni—Ti—Nb based multiple phase alloy consists of a combined phase which comprises a phase for the hydrogen permeability and a phase for the resistance to hydrogen embrittlement. The alloy has a composition satisfying the formula: NixTiyNb(100-x-y) in which x=25˜45 mol % and y=25˜55 mol %. A metal membrane for hydrogen separation-purification is prepared using the alloy material. The alloy material is prepared by blending Ni, Ti and Nb and melting the blend. The metal membrane permits the hydrogen separation-purification and thus the resulting purified hydrogen gas can be used as a fuel and can be applied to fields of production of semiconductors.
摘要:
An Nb—Ti—Co alloy having both good hydrogen permeability and good hydrogen embrittlement resistance comprises one of Fe, Cu or Mn as a fourth element, incorporating from 1 to 14 mol %. The content of Mn, if any, is preferably from 1 to 9 mol %. The desired hydrogen permeability can be attained by the (Nb, Ti) phase and the desired hydrogen embrittlement resistance can be attained by the CoTi phase, making is possible to obtain excellent hydrogen permeability and excellent hydrogen embrittlement resistance. None of Fe, Cu or Mn can impair these properties. Fe, Cu or Mn can replace some of the Co elements. Fe, Cu or Mn enhances the workability of the alloy.
摘要:
Disclosed is a furnace whose NOx emission may be reduced to a minimum degree so far unattainable in any prior art furnaces by optimumly controlling the ratio of exhaust gas mixed with the combustion air to be supplied to the burners to the exhaust gas to be mixed with the two-stage combustion air which is admitted through air nozzles into the combustion chamber and also by optimumly controlling the distribution of the two-stage combustion air in the combustion chamber depending upon the operating conditions. The present invention may be applied to any types of furnaces.
摘要:
A hydrogen permeable module includes a hydrogen permeable membrane that permeates hydrogen, an outer peripheral part of the hydrogen permeable membrane being restricted, an inside of the outer peripheral part of the hydrogen permeable membrane being not restricted. The hydrogen permeable module permeates the hydrogen by constantly keeping a pressure of a primary side to a pressure that is equal to or more than a pressure of a secondary side. The inside of the outer peripheral part of the hydrogen permeable membrane is not restricted so as to be capable of expanding to the secondary side.
摘要:
A hydrogen permeation/separation thin membrane including an Ni—Ti—Nb alloy, the Ni—Ti—Nb alloy being a cast foil material obtained by roll quenching and having a thickness of 0.07 mm or less, which has been subjected to a refining heat treatment, and the Ni—Ti—Nb alloy having the following composition (a) and alloy structure (b): (a) a composition consisting of 10 to 47 atomic % of Nb, 20 to 52 atomic % of Ti, and a remainder containing 20 to 48 atomic % of Ni and inevitable impurities; and (b) an alloy structure where fine particles of an Nb-based solid solution alloy formed of a solid solution of Ni and Ti in Nb are dispersed in a microstructure made of an Ni—Ti(Nb) intermetallic compound formed of a solid solution of an Ni—Ti intermetallic compound, in which part of Ti thereof is replaced by Nb; and a hydrogen permeation/separation thin membrane including an Nb—Ti—Ni alloy, the Nb—Ti—Ni alloy being a cast foil material obtained by roll quenching and having a thickness of 0.07 mm or less, which has been subjected to a refining heat treatment, and the Nb—Ti—Ni alloy having the following composition (a′) and alloy structure (b′): (a′) a composition consisting of 10 to 32 atomic % of Ni, 15 to 33 atomic % of Ti, and a remainder containing 48 to 70 atomic % of Nb and inevitable impurities; and (b′) an alloy structure where fine particles of an Ni—Ti(Nb) intermetallic compound formed of a solid solution of an Ni—Ti intermetallic compound, in which part of Ti thereof is replaced by Nb, are dispersed in a microstructure made of an Nb-based solid solution alloy formed of a solid solution of Ni and Ti in Nb.
摘要:
A cathode ray tube has a vacuum enclosure including a panel (1) having a screen (1a), a funnel (2) connected to the panel (1), and a neck (3) connected to the narrow part of the funnel (2). The funnel (2) has a yoke-mounting portion (5) on which a deflection yoke (7) is mounted. The sectional shape of the yoke-mounting portion (5), cut by a plane perpendicular to the tube axis of the funnel (2), varies from a circular shape to a substantially barrel shape having a maximum dimension at least in a direction of the horizontal axis or the vertical axis, as the position shifts from the neck (3) side to the panel (1) side of the yoke-mounting portion (5). With such an arrangement, the resistance to the external pressure can be improved, and the deflection power consumption can be reduced.
摘要:
A plunger is used for a multi-plunger type resin mold device which is adapted to be slidably inserted into a pot to permit a resin in the pot into a mold. The plunger includes a forward end member whose forward end edge portion is formed of silicon nitride, silicon carbide or zirconia, the forward end edge portion of said forward end pot member being in contact with the resin in the pot, and a plunger body to which the forward end member is fixed. The forward end member is fixed to the plunger body by threadably inserting an insertion section of the forward end member into a recess formed in the plunger body.