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 Productivity of Microtunneling Projects. Estimating Models for the Microtunneling Process for Water and Wastewater Pipelines
Наименование:

Productivity of Microtunneling Projects. Estimating Models for the Microtunneling Process for Water and Wastewater Pipelines

автор Mohamed H. издательство Книга по Требованию Прочие виды транспорта
Cтраниц 196        мягкая обложка       
Аннотация:Microtunneling can be applied in gravity and pressure lines, permanent ducts for cables, and crossings under rails or roads. When bidding a microtunneling project, the main concern of contractors is predicting the underground behavior of the machine. Penetration time, delay time, and preparation time for the microtunneling process were modeled. Penetration time was predicted for different soil conditions using deterministic techniques, while preparation and delay time used probabilistic techniques. Microtunneling is a trenchless technique that is used in installation of new pipelines. Contractors do not have enough resources for predicting the productivity of microtunneling machines. The need for utility service line replacement or repairs with minimum disruption to the surface has increased the demand for trenchless excavation methods like microtunneling. The book provides contractors with models to estimate microtunneling productivity to reduce their bidding risks and increase profit. It uses statistical modeling techniques.
Автор: Mohamed H.
Издательство: Книга по Требованию
Год:2009
Цена:
2768 руб
Нет в наличии
Поиск: Productivity of Microtunneling Projects. Estimating Models for the Microtunneling Process for Water and Wastewater Pipelines


ДОСТИГ ЦЕЛИ, А СЧАСТЬЕ НЕ НАСТУПИЛО?


Получение тонкопленочных электретов на основе фторопласта - 4 и изготовление приборов на их...

Аннотация. В дипломном проекте рассмотрен электретный эффект в пленках фторопластата - 4 толщиной 10 мкм с односторонней металлизацией алюминием. Разработана новая ячейка для электретирования в плазме газового разряда. Было проведено исследование влияния технологических факторов на получение и характеристики электретов. Для подтверждения модели формирования заряда проведены оптические исследования электретированных пленок. На основе полученных мембран разработан и изготовлен макет электретного датчика для экспериментального комплекса исследования проходимости бронхов. Abs rac . he elec re eflo films wi h 10 m hick ess wich is co sidered i gradua io paper o e side Al ju c io . e moder cell for plasm-e haced vapo elec re io is elabora ed. he s udy of i flue ce of ech ological fac ors o process of charge forma io model are followed. O base of he ob ai i g films model of elec re chip for experime al complex for exemi a io of bro chial ra spor is elabora ed. Содержание. Введение. 1.Обзор литературы. 5 1.1.Электреты. Общие сведения. 5 1.2.Методы получения электретов. 5 1.3.Обзор существующих моделей электретного эффекта 17 1.3.1.Модель заряда электрета на основе неполярного диэлектрика. 22 2.Технико-экономическое обоснование проекта 33 3.Экспериментальная часть 34 3.1.Методика получения электретов в плазме газового разряда 34 3.2.Установка для импульсного электретирования 37 3.3.Конструкция ячейки для электретирования 40 3.4.Работа установки 42 3.5.Методика измерения заряда электрета 43 3.6.Исследование влияния режимов электретирования на характеристики электретов 47 3.7.Оптические исследования электретированых пленок фторопласта - 4 62 3.8.Области применения электретного микрофона 65 3.9. Проектирование электретного датчика 67 3.9.1.Расчет чувствительности микрофона 67 3.9.2.Разработка конструкции датчика 13 3.10.Выводы по экспериментальной части 77 4.Экономическая часть 78 5.Безопасность и экологичность проекта 87 6.Заключение 95 7.Библиографический список 96 Введение.
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