摘要:
According to a method for producing a metallic magnetic powder for magnetic recording, which comprises treatment including, in sequence, a step of allowing a reducing agent to act on a metallic magnetic powder comprising particles having a metallic magnetic phase composed mainly of Fe or Fe and Co and containing one or more of rare earth elements (including Y), Al and Si (these are hereinafter referred to as “nonmagnetic ingredient”), in a liquid containing a complexing agent capable of forming a complex with at least one or more of the nonmagnetic ingredients, to thereby make the nonmagnetic ingredient in the powder particles dissolve out into the liquid (dissolution treatment step), a step of heat treatment in a reducing gas atmosphere (re-reduction treatment step), and a step of heat treatment in an oxidizing gas atmosphere (stabilization treatment step), a metallic magnetic powder for magnetic recording, which comprises particles having a particle length of from 10 nm to 45 nm and an axial ratio of 2 or more and in which the tip part of the particles is rounded, is obtained.
摘要:
A metal magnetic powder for a magnetic recording medium is provided whose particles have a metal magnetic phase, composed mainly of Fe or Fe plus Co, and an oxide layer, wherein the average major axis length of the powder particles is 10-50 nm, the average particle volume including the oxide layer is 5,000 nm3 or less, the atomic ratio (R+Al+Si)/(Fe+Co) calculated using the content values (at. %) of the elements contained in the powder particles is 20% or less, where R is rare earth element (Y being treated as a rare earth element). The metal magnetic powder is obtained by using a complexing agent and a reducing agent to elute nonmagnetic constituents after firing. The metal magnetic powder exhibits a large saturation magnetization σs for its particle volume while maintaining weatherability comparable to the conventional level and is suitable for a coated-type magnetic recording medium.
摘要:
A production equipment includes a substrate 2 placed inside and having a plurality of semiconductor elements 3 mounted thereon, and a resin molding mold 20 having a cavity 21. The mold 20 has resin injection ports 29a and air release ports 30a. Each of the resin injection ports 29a is formed in a top surface portion of the cavity in the mold in association with the corresponding semiconductor element 3. Each of the air release ports 30a is formed around each of the resin injection ports 29a.
摘要:
A high-reliability iron nitride-based magnetic powder with markedly improved weatherability with respect to deterioration over time of the magnetic properties in fine particles smaller than 25 nm is formed by adhering one or more of the elements Si and P to the surface of an iron nitride-based magnetic powder constituted primarily of Fe16N2 with an average grain size of 25 nm or less, where the total content of Si and P in the magnetic powder may be 0.1% or greater as an atomic ratio with respect to Fe. In particular, the invention provides an iron nitride-based magnetic powder such that the value ΔHc as defined by Equation (1) below is 5% or less and the value Δσs as defined by Equation (2) below is 20% or less. ΔHc=(Hc0−Hc1)/Hc0100 (1) Δσs=(σs0−σs1)/σs0100 (2) Here, Hc1 and σs1 are the coercivity and saturation magnetization, respectively, of the magnetic powder after being kept for one week at a constant temperature and constant humidity of 60° C. and 90% RH. Hc0 and σs0 are the coercivity and saturation magnetization of the magnetic powder before being kept at constant temperature and constant humidity.
摘要:
The present invention relates to a pyrimidine compound or a pharmaceutically acceptable salt thereof represented by the following formula [I] wherein each symbol is as defined in the specification and a method of therapeutically or prophylactically treating an undesirable cell proliferation, comprising administering such a compound. The compound of the present invention has superior activity in suppressing undesirable cell proliferation, particularly, an antitumor activity, and is useful as an antitumor agent for the prophylaxis or treatment of cancer, rheumatism, and the like. In addition, the compound of the present invention can be a more effective antitumor agent when used in combination with other antitumor agents such as an alkylating agent or metabolism antagonist.
摘要:
A method for fabricating a semiconductor device, in which a semiconductor chip having a first surface and a second surface substantially parallel to each other is mounted on a submount such that the first surface faces the submount, includes: a first step of applying resin to at least one of the semiconductor chip and the submount; a second step of applying a pressure to the semiconductor chip and the submount so that the semiconductor chip and the submount are bonded to each other by the resin, resulting in electrical connection therebetween; and a third step of performing at least one of a film formation process, an etching process, a patterning process, and a washing process for the second surface of the semiconductor chip.
摘要:
A heat exchanger for an air conditioner comprises a plurality of heat-transfer tubes arranged in parallel to each other at predetermined intervals, and heat-transfer fins formed by helically winding a plurality of fine wires around the plurality of heat-transfer tubes. Preferably, the heat-transfer tubes are divided into groups of two adjacent heat-transfer tubes (1a, 1b), (1b, 1c), (1c, 1d), . . . , and at least one fine wire fin is wound helically around the two adjacent heat-transfer tubes of each group so that the fine wire fin does not cross other portions of the fine wire fin as viewed along a direction perpendicular to a plane including the axes of the plurality of heat-transfer tubes. When fabricating the heat exchanger, at least either the outer circumferences of the heat-transfer tubes or the outer circumferences of the fine wires are coated with a metal film formed by plating, and then the heat-transfer tubes and the fine wires are interlaced to form a heat exchanging structure. Then, the heat exchanging structure is heated to the melting point of the metal film so that the metal film is melted and the heat-transfer tubes and the fine wires are bonded together by the molten metal film.
摘要:
A power steering device includes a hydraulic pump for discharging working fluid, an actuator for producing a steering assisting force by means of working fluid, a hydraulic passage for connecting the hydraulic pump and the actuator, a check valve arranged to the hydraulic passage to allow flow of working fluid from the hydraulic pump to the actuator and preventing flow thereof in the opposite direction, an accumulator connected to the hydraulic passage downstream of the check valve, a pressure switch for detecting a pressure within the hydraulic passage downstream of the check valve, a control unit for controlling the hydraulic pump in response to the pressure switch, and a display for showing an anomaly of the power steering device. When determining the anomaly of the power steering device, the control unit stops the hydraulic pump and/or makes the display show the anomaly.
摘要:
In fabricating an MFIC by mounting a semiconductor chip on a substrate having a microstrip line by MBB bonding, a benzocyclobutene (BCB) film is used as a dielectric film of the microstrip line. By providing a means for preventing the deformation, peeling, and cracking of the BCB film during the fabrication process, the thickness of the dielectric film is held substantially equal even after flip-chip mounting, which reduces impedance fluctuations.
摘要:
The present invention reduces crosstalk, which occurs as a result of interference between signals running in each of respective wiring layers of a first semiconductor chip and a second semiconductor chip stacked surface to surface with a small gap. The semiconductor device includes a first semiconductor chip 1 having a first electrode pad 2 and a first wiring layer 9 in the main surface, and a second semiconductor chip 5 having a second electrode pad 6 and a second wiring layer 10 in the main surface confronting the first semiconductor chip. A bump 4 is provided for electrically coupling the first electrode pad 2 and the second electrode pad 6 together. An insulation layer 8 is disposed between the main surfaces of first semiconductor chip 1 and second semiconductor chip 5. An electro-conductive layer 7 is disposed between the main confronting surfaces of the first semiconductor chip and the second semiconductor chip.