Abstract: A ring oscillator for circulating pulse edges of two types therein includes an even number of inverting circuits connected in a ring. Each of the inverting circuits is operative to invert an input signal and output an inversion of the input signal. One of the inverting circuits is a first start inverting circuit which starts an operation of inverting an input signal in response to a first control signal applied from an external input. One of the inverting circuits except the first start inverting circuit and an inverting circuit immediately following the first start inverting circuit is a second start inverting circuit which starts an operation of inverting an input signal in response to a second control signal.

Abstract: A clad aluminum alloy material having high strength and high corrosion resistance for a heat exchanger, which is composed of a core material made of an aluminum alloy consisting of 0.3 to 2.0% of Mn, 0.25 to 0.8% of Cu, 0.05 to 1.0% of Si and 0.5% or less of Mg with the balance consisting of Al and unavoidable impurities; a sacrificial anode material bonded to one surface of the core material, the sacrificial anode material being made of an aluminum alloy consisting of 1.0 to 2.5% of Mg and 0.05 to less than 0.20% of Si with the balance consisting of Al and unavoidable impurities; and a cladding bonded to the other surface of the core material, the cladding being made of a brazing filler metal consisting of an Al-Si-base aluminum alloy. In the clad aluminum alloy materials, the core material may further include 0.35% or less of Ti and the sacrificial anode material may further include 3.0% or less of Zn or at least one member selected from the group consisting of 0.2% or less of In, 0.2% or less of Sn and 0.

Abstract: Disclosed herein are aluminum alloy fin materials useful for heat exchangers which consists of, in weight percentage, 0.8 to 1.8% Fe, 0.3 to 3.0% Zn, up to 0.3% Cu and at least one element selected from the group consisting of 0.05 to 0.25% Zr and 0.05 to 0.25% Cr, with the balance being Al and unavoidable impurities, wherein Mn in the unavoidable impurities is 0.3% or less. The fin material being characterized, after brazing, by its superior thermal conductivity and beneficial sacrificial anode effect. The fin material is also suitable as a core of a brazing fin material in combination with an Al-Si alloy brazing material in which the Al-Si alloy brazing material is clad as an outer cladding layer onto both sides of the core. The above unclad or clad fin materials can provide heat exchangers having high corrosion resistance and good heat transfer characteristics in combination with a fluid passage material made of brazing sheet or an extruded tube of pure aluminum or an aluminum alloy with not more than 0.

Abstract: Disclosed is an aluminum alloy clad material and a heat exchanger using the clad material, the clad material being composed of: (a) a core material made of an aluminum alloy consisting essentially of, in weight percentage, 0.3 to 1.5% manganese, 0.05 to 0.35% copper, 0.05 to 0.50% magnesium, 0.06 to 0.35% titanium, less than 0.1% silicon and up to 0.3% iron, the copper content being related to the magnesium content in accordance with the following equation: Cu(%)-0.2.ltoreq.Mg(%).ltoreq.Cu(%)+0.2, the balance being aluminum and incidental impurities; and (b) a cladding material made of an Si-containing aluminum alloy brazing filler material clad onto at one or both sides of the core material. The aluminum alloy clad material is superior in press formability, corrosion resistance and brazability. Particularly, when the percentage of fine Mn compounds of 0.1 .mu.m or less and the Ti content variation in the core material are controlled, further improved properties can be obtained.

Abstract: An aluminum alloy support material for a lithographic printing plate which consists essentially, on a weight basis, of 0.5-2.0 % Mn, 0.05-1.0 % Si, 0.15-1.0 % Fe, 0-0.10 % Ti, and a balance of Al and inevitable impurities. The support material has a specific resistance satisfying the following inequality:Specific resistance (.mu..OMEGA.mm).ltoreq.14+16[% Ti] as measured in liquid nitrogen at 77 K, and a particular size distribution of precipitates therein. The support is produced from an ingot of an aluminum alloy having the above composition by homogenizing, hot rolling, cold rolling, intermediate annealing, and finish cold rolling under specific conditions followed by electrochemical graining. The support has fine, uniform pits formed by electrochemical graining and improved strength and printability.

Abstract: A superior high-temperature strength aluminum alloy material is produced by consolidating rapdily solidified particulates of an aluminum alloy into a desired configuration, the aluminum alloy consisting of, in weight percentages, 4 to 15% Fe, and 0.5 to 8% V and the balance being essentially aluminum. The aluminum alloy may further contain at least one element selected from the group consisting of 0.5 to 8% Mo, 0.5 to 8% Ni, 0.3 to 8% Zr and 0.5 to 8% Ti and these additional components develop a further increased strength in the resulting formed materials. Since the consolidated aluminum materials above specified have a superior strength at high temperatures as well as moderate temperature without an expensive Ce, they are highly useful as economical heat-resistant materials for various applications, particularly for the fields where high strength at high temperatures and lightness of weight are required.