decreasing water loss and increasing the irrigation times are basic methods to develop agriculture, success in natural recourse projects, minimize the stress to planted bushes in natural fields and increase the productivity of soil and water sources. the use of super absorbent is one of these strategies to achieve these goals. the main purpose of this research was to study the effect of super a...

tomato, lycopersicum esculentum miller, is a grassy and annual plant from solanaceae family which is the most important farm plant after potato. the cotton-melon aphid, aphis gossypii glover (hem.: aphididae), is an important pests of tomato and vector of viral diseases in the farms and greenhouses. in the greenhouse its damage ranks second to the whiteflies (bemisia tabaci gennadius). in this ...

in river meandering, when flow passes through a bend, reduction of flow velocity and rising hydrostatic pressure cause super elevation phenomena at outer side and reduction of water surface at inner-side of the bend. a helical motion results, causing erosion of the outer side of the bend. installation of submerged vanes on the stream bed can reduce erosion of the outer bank significantly. in th...

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In this paper, the cascade refrigeration system and load cooling of natural working medium are integrated as one unit system, which can meet needs different temperature zones refrigerating in supermarkets. The concrete implementation scheme with R717 high refrigerant, CO2 low refrigerant carrier was designed. According to actual commercial super, design calculation NH3 cryogenic were carried ou...

The relation between super-Virasoro anomaly and super-Weyl anomaly in N = 1 NSR superstring coupled with 2D supergravity is investigated from canonical theoretical view point. The WZW action canceling the super-Virasoro anomaly is explicitly constructed. It is super-Weyl invariant but nonlocal functional of 2D supergravity. The nonlocality can be remedied by the super-Liouvlle action, which in ...

abstract soilless culture of greenhouse vegetables has been a fast developing section in iran during recent years. most growers use hydroponics systems with artificial substrates. some of the used substrates have low water retention which results in wasting a great deal of solution. on the other hand, low vigor of cucumber root in water and fertilizer absorption, especially in low media tempera...