摘要:
Synthetic stevensite composed of stevensite-type sodium magnesium phylosilicate of which metallic components consist essentially of magnesium, sodium and silicon. The synthetic stevensite is characterized by having an X-ray diffraction peak at a spacing of 16 to 26 .ANG. when treated with ethylene glycol. It can be produced by a process comprising hydrothermally treating an aqueous composition containing basic magnesium carbonate and a silica-sodium component selected from the group consisting of (i) sodium silicate, (ii) sodium silicate and amorphous silica, and (iii) amorphous silica and sodium silicate.
摘要:
A synthetic lamellar magnesium phyllosilicate has as the main component a composition represented by the following formula:Mg.sub.3 Si.sub.4 O.sub.10 (OH).sub.2.nH.sub.2 O (1)wherein n is a number of up to 5, and has X-ray diffraction peaks at spacings of 4.5-4.6 .ANG., 2.5-2.6 .ANG. and 1.5-1.6 .ANG., wherein the lamination asymmetry index (Is) defined by the following formula:Is=tan .theta..sub.2 /tan .theta..sub.1 (2)wherein.theta..sub.1 stands for the angle formed by the peak perpendicular and the peak tangent on the small diffraction angle side in said X-ray diffraction peak at a spacing of 4.5-4.6 .ANG., and.theta..sub.2 stands for the angle formed by the peak perpendicular and the peak tangent on the large diffraction angle side in said X-ray diffraction peak,is at least 3.0, the BET specific surface area is at least 300 m.sup.2 /g and the Methylene Blue decolorizing power (JIS K-1470) is at least 100 ml/g. This synthetic lamellar magnesium phyllosilicate is prepared by a process comprising subjecting active silicic acid or active aluminosilicic acid and an oxide or hydroxide of magnesium or a compound capable of forming said oxide or hydroxide under reaction conditions to a hydrothermal treatment.
摘要:
Disclosed is a composite body comprising amorphous and porous silica or silica-alumina and a layer of an aluminum-containing phylosilicate formed on surfaces of primary particles of the silica or silica-alumina. This composite phylosilicate is obtained by reacting a water-soluble silicate, a water-soluble zinc salt or magnesium salt and a water-soluble aluminum salt or aluminate in an aqueous medium containing a sol or gel of silica or silica-alumina. This composite phylosilicate has a large specific surface area and a large pore volume and has both the properties of a solid acid and the properties of a solid base.
摘要:
A device including a torsion bar rotatably mounted on the vehicle frame transversely thereof and a pair of rock arms extending integrally from the opposite ends of the torsion bar at right angles thereto and connected with a right and a left wheel, respectively. An abutment arm is fixed to the torsion bar at the middle thereof and engageable with a stop pad provided on the vehicle frame, when either or both of the wheels are moved down, to restrain further downward movement thereof. Thus, the spring rate of air springs associated with the respective wheels is in effect increased as the loads thereon are reduced, particularly in a lower load region.
摘要:
A diaphragm arranged in a rigid casing to define therein a chamber to be filled with a mass of gaseous spring medium and another chamber to be held under oil pressure load is normally bulged into the oil chamber and formed on both surfaces thereof with dense clusters of elastic piles or projections which are compressed against each other only when the diaphragm is displaced from its neutral position to the load side as the load is reduced. Such displacement of the diaphragm is resisted by the elastic projections so as to increase the spring constant of the device in the lower load region and, with the device, used as a spring for automotive suspension, the pitching and rolling movements of the vehicle body are minimized.
摘要:
Chipping of semiconductor chips is to be prevented. A semiconductor device comprises a semiconductor chip having a main surface, a plurality of pads formed over the main surface, a rearrangement wiring formed over the main surface to alter an arrangement of the plurality of pads, and a protective film and an insulating film formed over the main surface, and a plurality of solder bumps each connected to the rearrangement wiring and arranged differently from the plurality of pads. The presence of a bevel cut surface obliquely continuous to the main surface and formed on a periphery of the main surface of the semiconductor chip prevents chipping.
摘要:
A semiconductor device manufacturing method comprising the steps of providing a matrix substrate having a main surface with plural device areas formed thereon, fixing plural semiconductor chips to the plural device areas respectively, then sealing the plural semiconductor chips all together with resin to form a block sealing member, dividing the block sealing member and the matrix substrate for each of the device areas by dicing, thereafter rubbing a surface of each of the diced sealing member portions with a brush, then storing semiconductor devices formed by the dicing once into pockets respectively of a tray, and conveying the semiconductor devices each individually from the tray. Since the substrate dividing work after block molding is performed by dicing while vacuum-chucking the surface of the block sealing member, the substrate division can be done without imposing any stress on an external terminal mounting surface of the matrix substrate.
摘要:
A cooling water structure for an engine with improved external appearance and reduced cost. A first passage section of a cooling water passage discharges cooling water from a water pump to water jackets of front and rear cylinders. The first passage section is formed in a surface of a partition wall of a right case that is an inside wall surface of a crank case. The water pump is accommodated with the first passage section in a crank chamber of the crank case.
摘要:
The back side of a strip substrate with plural semiconductor chips mounted thereon is vacuum-chucked to a lower mold half of a mold, and in this state the plural semiconductor chips are sealed with resin simultaneously to form a seal member. Thereafter, the strip substrate and the seal member are released from the mold and are cut into plural semiconductor devices. The semiconductor devices thus obtained are improved in their mounting reliability.
摘要:
The back side of a strip substrate with plural semiconductor chips mounted thereon is vacuum-chucked to a lower mold half of a mold, and in this state the plural semiconductor chips are sealed with resin simultaneously to form a seal member. Thereafter, the strip substrate and the seal member are released from the mold and are cut into plural semiconductor devices. The semiconductor devices thus obtained are improved in their mounting reliability.