نتایج جستجو برای: due to old machinery
تعداد نتایج: 10692856 فیلتر نتایج به سال:
Corrosion is the deterioration of materials by chemical interaction with their environment. The consequences of corrosion are many and varied. The effects of these on the safe, reliable and efficient operation of equipment or structures are often more serious than the simple loss of a mass of metal. The two main reasons for replacing machinery or equipment include upgrading old equipment and su...
gol-e-gohar iron ore mine of sirjan in southern part of iran is a large open pit that operates below the groundwater table and during mining operation, dewatering is required to prevent operation processes from flooding. current operation is going on by digging wells in or out of the pit and pumping to prevent flooding. as a result of the former dewatering operation a vast deep cone of depressi...
This paper aims to outline findings from a research project that has investigated an initiative to stimulate youths to become more entrepreneurial. The concept of summer entrepreneur has been developed in the last decade in a Swedish county. It was developed out of the idea that youths should have a possibility to run their own companies as alternative to traditional summer vacation employments...
efl/esl textbooks have been regarded as essential language teaching materials with which the learners spend about 70 up to 90 percent of their class time. the important role they play and their vast use make them not only influential in learning the language but also in shaping values and attitudes. put it another way, textbooks socialize learners using their contents (i.e. texts, illustrations...
It is known that machinery in agriculture used to perform work optimal agricultural terms under difficult conditions, which requires constant improvement of approaches determining the technical condition. Technical service main and most effective measure ensures maintenance machines working condition during life cycle. At same time, order objectively determine machine, it necessary obtain an ap...
today, scouring is one of the important topics in the river and coastal engineering so that the most destruction in the bridges is occurred due to this phenomenon. whereas the bridges are assumed as the most important connecting structures in the communications roads in the country and their importance is doubled while floodwater, thus exact design and maintenance thereof is very crucial. f...
Background and objective: Due to the fact that the desert areas of our country experience devastating floods in autumn and winter, and heavy machinery inevitably need transportation roads for relief and reconstruction in flooded areas. Pavement failure with saturated layers due to floods is considered. Method: In this research, Everstress software has been used for modeling and fine sand with 3...
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