منابع مشابه
A silica long base tiltmeter with high stability and resolution.
In order to be able to provide valuable data in multiparameter measurement field operations, tiltmeters need to have a noise level better or equal than 10(-9) rad for a period range from a few minutes to a few years and a long term stability ranging from 10(-7) to 10(-8) rad/yr. Tiltmeter measurements should also be as much as possible insensitive to thermal disturbances, by taking great care o...
متن کاملتعیین توزیع دما در جداره لوله در دیگهای بخار از نوع water-tube
دیواره آبی غشایی به عنوان سطح جاذب حرارت ، برای تولید بخار، در اکثر دیگهای بخار لوله- آب ، مورد استفاده قرار می گیرد. این دیواره، باید در شرایط مختلف بهره برداری، بسیار قابل اطمینان و ایمن باشد. در رساله حاضر، تغییرات درجه حرارت ، توزیع دما و نحوهء انتقال حرارت هدایتی، در داخل جدارهء دیواره آبی دیگهای بخار لوله-آب ، مورد بررسی قرار گرفته است . شناخت رفتار حرارتی فلز و انتخاب نوع آن و نیز آگاهی ...
15 صفحه اولWhite Paper: Tiltmeter-Based Bridge Scour Monitoring
Scour is by far the primary cause of bridge failures in the United States. Scour and other hydraulic effects are particularly threatening because the deterioration is often invisible , hidden beneath turbid water. Many scour monitoring methods attempt to measure the development of scour pockets themselves. However, this is difficult due to debris — both floating and submerged — and shifting str...
متن کاملA numerical investigation of γ-Al2O3-water nanofluids heat transfer and pressure drop in a shell and tube heat exchanger
The effect of γ-Al2O3 nanoparticles on heat transfer rate, baffle spacing and pressure drop in the shell side of small shell and tube heat exchangers was investigated numerically under turbulent regime. γ-Al2O3-water nanofluids and pure water were used in the shell side and the tube side of heat exchangers, respectively. Since the properties of γ-Al2O3-water nanofluids were variable, they were ...
متن کاملMeasurement of Local Convective Heat Transfer Coefficient of Alumina-Water Nanofluids in a Double Tube Heat Exchanger
Heat transfer coefficient and thermal efficiency of γ-Al2O3/water nanofluids flowing through a double tube heat exchanger were experimentally investigated. The nanoparticles were well dispersed in distilled water at 0.05–0.15 %vol. A large number of experiments were performed at different fluid flow rates under turbulent flow regime (18,000<Re<40,000) and various nanofluid...
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ژورنال
عنوان ژورنال: Zisin (Journal of the Seismological Society of Japan. 2nd ser.)
سال: 1984
ISSN: 0037-1114,1883-9029,2186-599X
DOI: 10.4294/zisin1948.37.4_677