منابع مشابه
Greenhouse Plant Growing Systems
Each plant production system must foster the availability of oxygen to the plant roots. This includes every plant production system, ranging from the garden or agricultural field outside to the commercial and hobby hydroponics system in the greenhouse. In successful production systems, this happens. It may be due to a favorable air/water relationship in the media or a media component. It may be...
متن کاملNearly Disjoint Covering Systems
We pose the problem of the existence of incongruent covering systems of residue sets, where two residue sets intersect if and only if their moduli are relatively prime . We show how such covering systems give rise to nearly disjoint cell covers of a lattice box, and thereby obtain a partial solution . In particular, we show that the number of primes dividing the 2 .c .m . of the moduli of the r...
متن کاملIncongruent restricted disjoint covering systems
We define a restricted disjoint covering system on [1, n] as a set of congruence classes such that each integer in the interval [1, n] belongs to exactly one class, and each class contains at least two members of the interval. In this paper we report some computational and structural results and present some open problems concerning such systems.
متن کاملSingle Assignment Capacitated Hierarchical Hub Set Covering Problem for Service Delivery Systems Over Multilevel Networks
The present study introduced a novel hierarchical hub set covering problem with capacity constraints. This study showed the significance of fixed charge costs for locating facilities, assigning hub links and designing a productivity network. The proposed model employs mixed integer programming to locate facilities and establish links between nodes according to the travel time between an origin-...
متن کاملCovering Materials Incorporating Radiation-Preventing Techniques to Meet Greenhouse Cooling Challenges in Arid Regions: A Review
Cooling greenhouses is essential to provide a suitable environment for plant growth in arid regions characterized by brackish water resources. However, using conventional cooling methods are facing many challenges. Filtering out near infra-red radiation (NIR) at the greenhouse cover can significantly reduce the heating load and can solve the overheating problem of the greenhouse air. This paper...
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ژورنال
عنوان ژورنال: HortTechnology
سال: 1993
ISSN: 1063-0198,1943-7714
DOI: 10.21273/horttech.3.1.50