Abstract: Efficiency of producing polycrystalline silicon is improved. A silicon filament (11) is constituted by a rod-shaped member made of polycrystalline silicon. The polycrystalline silicon has an interstitial oxygen concentration of not less than 10 ppma and not more than 40 ppma. On a side surface, in a lengthwise direction, of the rod-shaped member, crystal grains each having a crystal grain size of not less than 1 mm are observed.

Abstract: Efficiency of producing polycrystalline silicon is improved. A silicon filament (11) is constituted by a rod-shaped member made of polycrystalline silicon. The polycrystalline silicon has an interstitial oxygen concentration of not less than 10 ppma and not more than 40 ppma. On a side surface, in a lengthwise direction, of the rod-shaped member, crystal grains each having a crystal grain size of not less than 1 mm are observed.

Abstract: An electric power steering apparatus in which a housing (3) is formed with a housing opening (38) through which bus bars (20) pass for electrically connecting the motor (1) and the control circuit unit (2) with each other. A casing is formed with a heat sink opening (46) through which the bus bars (20) pass, so that the motor (1) and the control circuit unit (2) are integrated with each other with the housing opening (38) and the heat sink opening (46) disposed to correspond to each other.

Abstract: An electric power steering apparatus in which a housing (3) is formed with a housing opening (38) through which bus bars (20) pass for electrically connecting the motor (1) and the control circuit unit (2) with each other. A casing is formed with a heat sink opening (46) through which the bus bars (20) pass, so that the motor (1) and the control circuit unit (2) are integrated with each other with the housing opening (38) and the heat sink opening (46) disposed to correspond to each other.

Abstract: A heat exchanger made of aluminum includes a plurality of tubes made of aluminum through which a fluid to be heat exchanged flows, the tubes having a metal surface of aluminum; fins made of aluminum arranged between the tubes for accelerating heat exchange between the fluid to be heat-exchanged and air, the fins having a metal surface of aluminum; a first protecting film of a chemical conversion coating formed on the metal surfaces of the tubes and fins and containing a metal component; and a second protecting film of an antimicrobial agent coating on the first protecting film, at least on the fins among the tubes and fins, the second protecting film having a chemical bond with the metal component of the first protecting film. An example of the antimicrobial agent is 2,2'-dithiobis(pyridine-1-oxide).

Abstract: A heat exchanger made of aluminum comprises a plurality of tubes made of aluminum through which a fluid to be heat exchanged flows, the tubes having a metal surface of aluminum; fins made of aluminum arranged between the tubes for accelerating heat exchange between the fluid to be heat-exchanged and air, the fins having a metal surface of aluminum; a first protecting film of a chemical conversion coating formed on the metal surfaces of the tubes and fins and containing a metal component; and a second protecting film of an antimicrobial agent coating on the first protecting film, at least on the fins among the tubes and fins, the second protecting film having a chemical bond with the metal component of the first protecting film. An example of the antimicrobial agent is 2,2'-dithiobis(pyridine-1-oxide).

Abstract: A heat exchanger has special usage such as an evaporator of an automotive air conditioner. This heat exchanger can improve wettability and can reduce a scattering of condensed water. This heat exchanger is treated by a special chemical conversion treatment so that this heat exchanger has two layers of coating on the surface thereof. One of the two layers is a chemical conversion coating formed on the surface of the heat exchanger. The other one is a resin coating formed over the chemical conversion coating. The chemical conversion coating is treated by immersing the heat exchanger into a water solution. The resin coating is also treated by immersing the heat exchanger having the chemical conversion coating into a water solution of organic high polymer material.

Abstract: A surface acoustic wave recording device is constructed for use in recording video signals in the surface of a master substrate. The device includes a pyramidal-shaped tip having a plurality of transducer electrodes for launching surface acoustic waves on the surfaces of the device structure. Surface acoustic waves launched from the plurality of transducers are focused at the apex of the record device. A stylus, for example, of diamond, affixed to the apex of the pyramidal structure vibrates in consonance with the signal to be recorded to cut the video signals into the surface of the master substrate.