scheduling is an important subject of production and operations management area. in flow-shop scheduling, the objective is to obtain a sequence of jobs which when processed in a fixed order of machines, will optimize some well defined criteria. the concept of transportation time is very important in scheduling. transportation can be done by robots. in situations that robots are used to transpor...

the response of root to water stress is one of the most important parameters for researchers. study of growth and distribution of root under different irrigation managements helpsresearchersto a better understanding of soil water content, and the availability of water and nutrition in water stress condition. to investigate the effects of four levels of irrigation under two different deficit irr...

A reaction-diffusion equation is studied in a time-dependent interval whose length varies with time. The reaction term either linear or of KPP type. On fixed interval, it well-known that if the less than certain critical value then solution tends to zero. When domain may vary time, we prove conditions under which does and not converge zero long We show that, even always strictly 'critical lengt...