摘要:
An aspect of the present invention relates to a method of manufacturing a hexagonal ferrite magnetic particle comprising melting an Al-containing starting material mixture to prepare a melt and quenching the melt to obtain an amorphous material; subjecting the amorphous material to heat treatment to cause a hexagonal ferrite magnetic particle to precipitate in a product obtained by the heat treatment; collecting a hexagonal ferrite magnetic particle by subjecting the product to treatment with an acid and washing, wherein the hexagonal ferrite magnetic particle collected has a particle size ranging from 15 to 30 nm, comprises 0.6 to 8.0 weight percent of Al, based on Al2O3 conversion, relative to a total weight of the particle, and Al adheres to a surface of the hexagonal ferrite magnetic particle.
摘要翻译:本发明的一个方面涉及一种制造六方晶系铁氧体磁性颗粒的方法,包括熔化含Al原料混合物以制备熔体并淬火熔体以获得无定形材料; 使无定形材料进行热处理,使六方晶系铁氧体磁性颗粒在通过热处理获得的产品中沉淀; 收集六方晶系铁氧体磁性颗粒,通过酸处理和洗涤进行处理,其中所收集的六方晶系铁氧体磁性颗粒具有15至30nm的粒度,包含基于Al 2 O 3转化率的0.6至8.0重量%的Al, 相对于颗粒的总重量,Al附着到六方晶系铁氧体磁性颗粒的表面。
摘要:
Operation mechanism of a working machine includes a main clutch lever pivotably provided on an operating handle, and a pivot member operable in interlocked relation to pivoting operation of the main clutch lever. The pivot member pivots about a pivot point differing in position from a pivot point of the main clutch lever. When fully pulled by pivoting operation of the main clutch lever, the cable member is located nearest to the pivot point of the pivot member, so that force reverse-pivoting the pivot member is reduced.
摘要:
A walk-behind self-propelled snow-removing machine includes a snow-removing-unit posture control member disposed on an operating section at one side thereof, a travel ready lever comprised of a deadman's lever mounted on one operation handlebar at the other side of the operating section, and a mode selector switch disposed on the operating section and located forwardly of the travel ready lever for selecting one of plural alternative snow removing operation modes that are set in advance in a control unit on the basis of a travel speed of a machine body, a revolving speed of an engine, and an opening of a throttle valve.
摘要:
A hexagonal ferrite magnetic powder having an average tabular diameter of from 15 to 28 nm, a coercive force (Hc) of from 2,000 to 5,000 Oe (from 160 to 400 kA/m), a switching field distribution (SFD) of from 0.3 to 0.7 and a D70/D50 of from 1.05 to 1.25. This magnetic powder can be obtained by melting and quenching starting materials to obtain an amorphous product, and thermally treating the product, which comprises increasing a temperature at a rate of 300 to 500° C./hr in a temperature range of 550 to 600° C. in the thermal treatment before the temperature reaches the thermally treating temperature.
摘要:
A hexagonal ferrite magnetic powder having an average tabular diameter of from 15 to 30 nm, a coercive force (Hc) of from 2,000 to 5,000 Oe (from 160 to 400 kA/m) and a saturated magnetization (σs) of equal to or more than [the average tabular diameter (nm)×0.37+45] A·m2/kg. This magnetic powder is obtained by melting a starting material containing a material which has a composition within the hatched region (1) in the triangular phase diagram shown in FIG. 1 and quenching the molten product to obtain an amorphous product, subjecting the amorphous product to a thermal treatment, acid treatment, and washing. Also, a magnetic recording medium is obtained by adding this magnetic powder to the magnetic layer and coating it on the support.
摘要:
A snow removal machine has first and second augers mounted on respective auger shafts. Each of the first and second augers has an outer helical auger blade, an intermediate helical auger blade and an inner helical auger blade. The outer helical auger blade and the inner helical auger blade of each of the first and second augers are disposed along a common first helical path and are spaced-apart from one another along a rotational axis of the corresponding auger shaft. The intermediate helical auger blade of each of the first and second augers is disposed along a second helical path angularly shifted substantially 180 degrees with respect to the first helical path.
摘要:
A magnetic recording medium comprising a support having provided thereon a magnetic layer containing a barium ferrite powder dispersed in a binder, wherein the concentration of Ba of the extract obtained by the following condition is 20 ppm or less per m2 of the magnetic recording medium: condition: 0.05 m2 of the magnetic recording medium is arbitrarily cut out and put in a 200 ml beaker with 100 ml of distilled water, the beaker is covered with a watch glass and retained in a constant temperature bath at 75° C. for 3 hours.
摘要翻译:一种磁记录介质,包括在其上设置有分散在粘合剂中的铁氧体粉末的磁性层的支撑体,其中通过以下条件获得的提取物的Ba浓度为每m 2磁记录20ppm以下 介质:条件:将0.05m 2的磁记录介质任意切出,并用100ml蒸馏水放入200ml烧杯中,用手表玻璃覆盖烧杯,并保持在75℃的恒温浴中 C. 3小时。
摘要:
An ultrasonic diagnosis apparatus which includes a plurality of ultrasonic transducers arranged two-dimensionally. In the ultrasonic diagnosis apparatus, the ultrasonic beams are transmitted by the ultrasonic transducers for three-dimensionally scanning a target of the object, and then, ultrasonic echo signals are obtained from the ultrasonic transducers. On the basis of the ultrasonic echo signals, three-dimensional data with respect to at least one of structure information and blood flow information in the object are generated in real time. Then, on the basis of the three-dimensional data, image information including at least one of a two-dimensional tomographic image and a three-dimensional projection image of an arbitrary cross section within the object is generated in real time. On the basis of the image information, navigation information for navigating a puncture needle toward the target of the object is displayed.
摘要:
A magnetic recording disk which comprises a nonmagnetic support having provided thereon a magnetic layer comprising a hexagonal ferrite magnetic material dispersed in a binder, wherein the magnetic layer has an orientation ratio of 0.9 or more, a vertical diamagnetic correction squareness ratio of from 0.3 to 0.55, an in-plane coercive force of from 1,400 to 3,000 Oe, a vertical-direction coercive force of from 1,400 to 3,000 Oe, and a dry thickness of 0.8 .mu.m or less.