نتایج جستجو برای: gravels transport
تعداد نتایج: 274140 فیلتر نتایج به سال:
The transport system of many Ukrainian cities does not meet the EU standards and requirements. There is a need to improve urban transport networks, to use transport potential efficiently on the basis of environmental logistics and to improve environmental safety as one of the principles of sustainable transport development. The systems model to create an ecologically safe logistics system of pu...
In the small fraction of Earth's surface with highest erosion rates such as Alps and Himalayas quantifying incision, rock uplift inferring climatic controls on landscape can be relatively straightforward once ages river terraces cut in bedrock (strath terraces) are constrained. However, many mid to lower relief settings that more typical mountain belts worldwide, periods net incision riverbed l...
The success in a business requires a complicated communication Management System. The Main objective of this research paper we are developing an optimization approach when there is one producer and several distribution centers. The model comprised of several parameters such as transport type, route specification, and transport capacities. Also we imposed several limitation such as capacity, nu...
A Correction to this paper has been published: https://doi.org/10.1007/s12517-021-08442-z
در یکی از شاخه های نانوالکترونیک که با اسپین سروکار دارد(اسپینترونیک) هدف و چالش اصلی تولید جریان اسپین قطبیده است. یکی از طرح های پیشنهادی برای تولید جریان اسپینی روش پمپاژ اسپینی ( spin pumping ) نامیده می شود. در این روش تغیرات وابسته به زمان چند پارامتر سیستم به صورت دوره ای در القای دینامیک اسپین و تولید جریان اسپینی نقش ایفا می کنند. مسئله مورد برسی ترابرد مزوسکوپی و بی درروی اسپی...
In this study, coal gangue was used to replace the four single-graded natural gravels of 0~5 mm, 5~10 10~20 and 20~26.5 mm design mix ratio study influence in particle size changes on mechanical properties mixture. The research results show that: maximum dry density mixture with is lower than crushed stone water-stable mixture, optimal moisture content higher that mixture; aggregate mixed cemen...
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