摘要:
A heat exchanger made of aluminum alloys comprising a tube made of an aluminum alloy consisting of 0.2 to 1.0 wt % of Cu and the balance Al and inevitable impurities, and fins jointed to the tube, at least a portion of each fin being formed from another aluminum alloy exhibiting and electrochemical potential value lower than that of the aluminum alloy from which the tube is made, so as to provide a sacrificial corrosion effect. Disclosed also is an aluminum alloy material having superior hot-extrusion characteristics and pitting corrosion resistance suitable for use as the material of heat exchanger tubes, the aluminum alloy material consisting of 0.2 to 1.0 wt % of Cu and the balance Al and inevitable impurities.
摘要:
Al and Al alloy materials for a fin are disclosed which contain Fe of 0.2% or less and Si of 0.1% or less and exhibit improved thermal conductivity, sacrificial anode effect and sagging resistance. Also, a heat exchanger having a fin made of the Al and Al alloy material incorporated therein is disclosed. The heat exchanger is lightweight and excellent in corrosion resistance and heat radiation.
摘要:
An electron beam irradiation system has a pumping block at an end of a microscope column of electron optics. The system has the rotary stage, the microscope column for directing an electron beam at the target on the rotary stage, the pumping block for evacuating air in the gap between the column and the target, a moving mechanism for sliding the rotary stage between a working position and a mounting position, and a cover member. In the working position, the target is opposite to the column. The cover member is brought into intimate contact with the rotary stage or target to prevent vacuum deterioration when the rotary stage moves from the working position to the mounting position.
摘要:
This invention relates to a composite material for vacuum brazing comprising a cladding material for vacuum brazing composed of 0.1-2.0 wt. % of zinc, 0.01-2.0 wt. % of at least one member selected from the group consisting of calcium, sodium and potassium and the balance of aluminum, and a core material consisting of aluminum or an aluminum alloy having said cladding material clad onto one surface of both surfaces thereof.
摘要:
An electron beam irradiation apparatus in a partial vacuum method is structured with a static pressure floating pad 18 connected to a vacuum chamber 14 containing an electron beam column 15 and in a condition that the static pressure floating pad 18 is attached to a subject 1 to be irradiated without contacting, and an electron beam irradiating the subject 1 to be irradiated through an electron beam path 19 of the static pressure floating pad 18, whereby the vacuum chamber and the electron beam column can be maintained in the required degree of vacuum even in a condition that the static pressure floating pad 18 is separated from the subject 1 to be irradiated. A vacuum seal valve 30 including a piston to open and close the electron beam path 19 is provided within the static pressure floating pad 18. When the static pressure floating pad 18 is separated from the subject 1, the vacuum seal valve 30 is structured to be activated to close the electron beam path 19 so as to prevent the air from flowing into the vacuum chamber 14. In this structure, the vacuum seal valve 30 is formed with a round shaped cross section and in a tapered shape with a narrow tip so as to accomplish high vacuum seal without a gap, so that the degree of vacuum in the vacuum chamber and the electron beam column can surely be maintained.
摘要:
An electrode for a sealed nickel/metal hydride battery and a method of manufacturing the same, which is capable of suppressing a decrease in the charging reserve of a hydrogen-storage alloy electrode (negative electrode) and an increase in the internal pressure of the battery, is provided. The hydrogen-storage alloy electrode is formed using a tackifier or a binder which is prepared from an organic polymer material containing the ether linkage (--O--), for example, polyethylene oxide, polypropylene oxide , or polybutylene oxide. The specified material is suitably hydrophilic, and it exhibits an oxidation resistance which is much higher than that of a conventional material containing the hydroxyl group (--OH). Therefore, the specified material is especially resistant to oxidation and decomposition at the positive electrode of the battery and can significantly reduce the production of hydrogen attributed to the oxidation and decomposition.
摘要:
A flux for brazing the aluminum parts characterized by comprising 5 to 95 wt. % of K.sub.2 AlF.sub.5 or K.sub.2 AlF.sub.5.H.sub.2 O and the remainder of KAlF.sub.4 and preparing method of the same.
摘要:
A root canal irrigation means for treating decayed teeth including a liquid vessel filled with water, antiseptic solution or some other kind of liquid, a pumping means for pumping the liquid from the liquid vessel under pressure, and a discharge needle shaped like an injection needle coupled to the outlet of the pumping means and which feeds the liquid under pressure to a dental focus when the pumping means is operated. The pumping means comprises a reciprocating pump which is coupled to the outlet of the liquid vessel.
摘要:
When a normal disk having the diameter of 12 cm is inserted into the disk device, first and second optical detecting elements detect the insertion, and transitions to a first detection state, which initiates transfer operation of first and second transfer rollers. If the disk is further moved to an inner portion of the device, thus pressing first and second detecting pins, first and second detecting switches are turned OFF, and the detecting elements enter a second detection state. Before the transition from the first detection state to the second detection state occurs, a rotating speed of the first and second transfer rollers is set low. After transition to the second detection state, the rotating speed is increased. As a result, a card or other such foreign objects can be removed and a monitoring period can be increased until detection of a normal disk is detected.
摘要:
A guide groove is formed without wobbles. The guide groove is periodically modulated with its width. Encrypted data are recorded with marks formed on the record film along the guide groove. Information recorded by periodically modulating the guide groove with its width can be accurately detected by a band pass filter. Thus, rotation control information and address information can be stably reproduced. In addition, since the guide groove is formed without wobbles, a drive device having a pirated disc determination mechanism can reproduce encrypted content as with a ROM disc.