منابع مشابه
The Intelligent Control System of the Freezing Station in Coal Mine Freezing Shaft Sinking
In order to address the issue of low degree of automation and huge waste of electric energy of the equipment in drilling engineering freezing station which adopts the freezing method of coal mine, we need to design an intelligent control system to control both the brine pump and double stage ammonia screw compressor. According to the actual cooling need in freezing project, this new system is a...
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Shaft sinking is one of the main parts in underground mine planning. Shaft has various applications in underground mines e.g. minerals exiting flow, gases entrance or exit way, stope developments for exploitation etc. Considering that this section requires an abundance of expenses, management always following the election is the way that both terms have the technical considerations, economic co...
متن کاملEvaluation of freezing tolerance in olive cultivars by stomatal density and freezing stress
Selection of frost tolerant cultivars and understanding the mechanisms of frost hardiness could help to improve freezing resistance in olive plants. Olive cultivars may differ in frost hardiness due to differential survival of specific organs. The aim of this study was to screen different olive cultivars based on their stomatal density and metabolic modifications under cold conditions. The ‘Zar...
متن کاملSinking treasure
social engagements. With the Bologna system, everything is fitted to match a 40 hour per week work schedule for the entire year allowing only for 6 weeks of holiday and one week of illness. Many students are now protesting against this reduction of university to a school-like system. Students also protested against tuition fees, which have been introduced only recently in a break with a long tr...
متن کاملRetinoblastoma treated by freezing.
The effect of cryotherapy on intraocular neoplasms is disappointing, except in the case of retinoblastoma, which is readily destroyed by freezing and in which cures have been reported by Lincoff, Maclean, and Long (I967) and Rubin (I969). This communication reports the effect of cryotherapy on the second eye in a case of bilateral retinoblastoma, in which complete histological examination of th...
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ژورنال
عنوان ژورنال: Science
سال: 1884
ISSN: 0036-8075,1095-9203
DOI: 10.1126/science.ns-4.92.443