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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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Применить Всего найдено 2. Отображено 2.
02-05-2023 дата публикации

Method and system for predicting shield tail sealing grease consumption of slurry balance shield tunneling machine

Номер: CN116050285A
Автор: BAEK YOUNG-MIN, LIU SIJIN, MA YUYANG, HE CHUAN, FANG YONG, WANG HUAWEI, XIONG YINGJIAN, ZHUO BIN, XU GONGYUN, JIA SIZHEN, WANG YUBO, ZOU FUQING, GENG FANGCHUANG, QIAN JUQIANG, SHI LINKEN
Принадлежит:

The invention provides a slurry balance shield machine shield tail sealing grease consumption prediction method and system. The method comprises the steps that parameter big data generated by shield tunneling is preprocessed, and parameters influencing shield machine grease consumption are screened for the first time; performing Spearman correlation analysis on the primarily selected parameters and secondarily screening research parameter data; after performing normalization and time serialization processing on research parameters, dividing the research parameters into a training set and a test set; establishing an artificial neural network model; taking the training set as the input of an artificial neural network, and training the neural network to obtain an optimal hyper-parameter model; and verifying the trained optimal hyper-parameter model by using the test set, and outputting the predicted grease consumption. According to the method, the consumption trend and consumption of the shield ...

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Номер записи: 1
04-04-2023 дата публикации

Preparation method of alpha-cyhalothrin

Номер: CN115894291A
Автор: XIE BANGWEI, FENG SULIU, ZHANG XIAOFEI, XIE CHUNMAN, ZOU FUQING
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The invention relates to a preparation method of alpha-cyhalothrin, which comprises the following steps: adding sodium cyanide and a phase transfer catalyst into a three-neck bottle, and stirring at room temperature until the sodium cyanide and the phase transfer catalyst are completely dissolved; the preparation method comprises the following steps: dissolving ether aldehyde and a chiral catalyst in methylbenzene, adding into a reaction flask, stirring for 1 hour at the temperature of 0-minus 5 DEG C, and reacting to generate S-cyano-3-phenoxy benzyl alcohol; the method comprises the following steps: adding a solvent into a reaction kettle, dropwise adding cis-Z kung-fu refined acyl chloride, after dropwise adding, carrying out heat preservation stirring at 0-5 DEG C for 3-4 hours, and removing the solvent to obtain yellow oily liquid, namely optically active alpha-cyhalothrin crude oil with the content of 95% or above; the method comprises the following steps: adding a solvent and alpha-cyhalothrin ...

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Номер записи: 2