摘要:
A composition used for high-strength impermeable concrete. The composition contains sand, stone, cement, water reducer, water and reinforced impermeable sand. The reinforced impermeable sand includes aeolian sand and binder covering the surface of the aeolian sand. The reinforced impermeable sand can fill the gap between the sand and the stone, and well combine various components in the composition, and suppress the seepage phenomenon of the molded concrete, thereby greatly improving the strength and impermeability of the concrete.
摘要:
Embodiments of the present invention provide a method, a server, and a system for implementing a video-based value-added service. The method includes: acquiring, by an event server, association event data which corresponds to a video currently played by a first client; when detecting an event trigger condition, generating, by the event server, an event notification according to the association event data, and sending the event notification to an application server; forming, by the application server, value-added service content according to preset value-added service data and event data in the event notification, and providing the value-added service content for a second client.
摘要:
The present invention relates to a method comprising reducing a ketone of formula I: with an enantioselective hydrogenating agent to form substantially enantiomerically pure alcohol of formula II: where R—R4 and m are as defined herein. The method of the present invention is useful for making CCR2 modulators as wells as precursors CCR2 modulators.
摘要:
A packaged semiconductor device is assembled using a first lead frame upon which a die is mounted and encapsulated and a second lead frame that provides bent leads for the device. By using two different lead frames, an array of the first lead frames can be configured with more lead frames for more devices than a comparably sized lead frame array of the prior art because the first lead frame array does not need to provide the leads for the packaged devices. Instead, the leads are provided by the second lead frame array, which can be attached to the first lead frame array after the dies have been mounted and encapsulated on the first lead frame array.
摘要:
A three dimensional package includes a substrate having a columnar part including a sidewall, and stairs or steps arranged along the sidewall of the columnar part in the form of multiple helixes twisted around the columnar part. Semiconductor integrated circuits (IC dies) are attached on one or both of the supporting surfaces of the stairs. The columnar part, the stairs and the IC dies can be encapsulated with a mold compound.
摘要:
A packaged semiconductor device is assembled using a first lead frame upon which a die is mounted and encapsulated and a second lead frame that provides bent leads for the device. By using two different lead frames, an array of the first lead frames can be configured with more lead frames for more devices than a comparably sized lead frame array of the prior art because the first lead frame array does not need to provide the leads for the packaged devices. Instead, the leads are provided by the second lead frame array, which can be attached to the first lead frame array after the dies have been mounted and encapsulated on the first lead frame array.
摘要:
The present invention relates to the preparation of pyridinone carboxylic acid aldehydes such as 5-methoxy-6-(methoxycarbonyl)-4-oxo-1-(2-oxoethyl)-1,4-dihydropyridine-3-carboxylic acid.
摘要:
A semiconductor device has a die support and external leads formed integrally from a single sheet of electrically conductive material. A die mounting substrate is mounted on the die support, with bonding pads coupled to respective external connection pads on an external connector side of the substrate. A die is attached to the die mounting substrate with die connection pads. Bond wires selectively electrically couple the die connection pads to the external leads and the bonding pads and electrically conductive external protrusions are mounted to the external connection pads. An encapsulant covers the die and bond wires. The external protrusions are located at a central region of a surface mounting side of the package and the external leads project outwardly from locations near the die support towards peripheral edges of the package.
摘要:
Aligned multi-walled carbon nanotubes were grown on both sides of a metallic or metal-coated substrate by water vapor-assisted chemical vapor deposition. Aligned carbon nanotube films of thickness ranging from 1 μm to over 100 μm were obtained. By manipulating various operating factors—position of substrate in the reactor, amount of water vapor, amount of catalyst, reactor temperature, and growth time, the morphology and thickness of these carbon nanotube films could be adjusted.
摘要:
The present invention relates to a method comprising reducing a ketone of formula I: with an enantioselective hydrogenating agent to form substantially enantiomerically pure alcohol of formula II: where R—R4 and m are as defined herein. The method of the present invention is useful for making CCR2 modulators as wells as precursors CCR2 modulators.