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Небесная энциклопедия

Космические корабли и станции, автоматические КА и методы их проектирования, бортовые комплексы управления, системы и средства жизнеобеспечения, особенности технологии производства ракетно-космических систем

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Мониторинг СМИ

Мониторинг СМИ и социальных сетей. Сканирование интернета, новостных сайтов, специализированных контентных площадок на базе мессенджеров. Гибкие настройки фильтров и первоначальных источников.

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Поддерживает ввод нескольких поисковых фраз (по одной на строку). При поиске обеспечивает поддержку морфологии русского и английского языка
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Применить Всего найдено 2. Отображено 2.
26-02-2014 дата публикации

Compound type sound barrier for high-speed railway

Номер: CN103603277A
Автор: REN QIZENG, YU JIAN, WANG YIWEN
Принадлежит:

The invention discloses a compound type sound barrier for a high-speed railway. The compound type sound barrier comprises a base and a panel. A recessed sound absorbing cavity is arranged in the middle of the base, and a protruding frame is arranged on the periphery of the base. The panel is embedded into the frame on the periphery of the base, and through holes are distributed in the surface of the panel evenly. Sound absorbing materials are filled in the sound absorbing cavity. The ratio of a middle-low frequency sound absorbing material to a middle-high frequency sound absorbing material is 3:7. The through hole direction and the panel form a 20-50-degree angle. The diameter of the through holes is 20-40 cm, the density of the through holes is 100-120 holes per square meter, and the porosity is 30-60%. The panel is connected with the base through a rubber gasket. By embedding the sound barrier into the base, the service life of the sound barrier is prolonged, and maintaining performance ...

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Номер записи: 1
26-02-2014 дата публикации

Epoxy polyurethane compounded cement based sound barrier panel and making method thereof

Номер: CN103601438A
Автор: REN QIZENG, YU JIAN, WANG YIWEN
Принадлежит:

The invention discloses an epoxy polyurethane compounded cement based sound barrier panel and a making method thereof. The epoxy polyurethane compounded cement based sound barrier panel comprises, by weight, 12-18 parts of cement, 50-68 parts of fine sand, 2-3 parts of water, 0.2-0.4 parts of an early strength agent, 0.1-0.3 parts of a water reducer, 2-5 parts of a reinforcing fiber, 5-12 parts of an aqueous epoxy resin, 4-10 parts of an aqueous epoxy resin curing agent and 3-8 parts of aqueous polyurethane. In the invention, a sound barrier surface layer cement based material is modified by the aqueous polyurethane and the aqueous epoxy resin, and the hydration of cement and the curing of a high-molecular material are simultaneously carried out to realize mutual filling in order to form a composite material. The panel made in the invention has the advantages of small volume shrinkage, bending resistance, earthquake resistance, permeability resistance, crack resistance, good durability ...

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Номер записи: 2