The allelopathic potential of Rhus chinensis Mill on seedling growth of radish（Raphanus sativus L.）,semen cassiae（seed of Cassia obtusifolia L.） and black soyabean [Glycine max（L.） Merr.] was investigated under ...The allelopathic potential of Rhus chinensis Mill on seedling growth of radish（Raphanus sativus L.）,semen cassiae（seed of Cassia obtusifolia L.） and black soyabean [Glycine max（L.） Merr.] was investigated under laboratory conditions.The water extracts of seed,leaf and bark of R.chinensis inhibited the germination and the growth of roots and shoots of radish,semen cassiae,and black soyabean.Significant increasing reductions in the germination and growth of roots and shoots were observed as the concentration of water extract increased in all bioassays.The order of allelopathic potentials of the three parts from R.chinensis plant on seed germination of these receptors was leaf [ seed [ bark.However,the inhibition of water extracts from R.chinensis seed on root activity of semen cassiae was more severe than from the other two parts.The allelopathic potential on the germination of radish was higher than that of black soyabean and semen cassiae.The integrated effect index for allelopathic potential of water extracts of leaf of R.chinensis on radish,semen cassiae and black soyabean seedling growth were-0.88,-0.93 and-0.98 respectively.The results suggested that it is important to minimize the negative allelopathic potential of R.chinensis in agroforestry systems,and to exploit this traditional Chinese medicinal tree for the production of natural bio-pesticides.展开更多
In this paper,the structural properties of revenue management in a hubto-hub airline network is studied.Using a reformulated network flow version of the problem,it is shown that the optimal value has supermodularity,s...In this paper,the structural properties of revenue management in a hubto-hub airline network is studied.Using a reformulated network flow version of the problem,it is shown that the optimal value has supermodularity,submodularity,and Lconcavity in the network’s capacities dimensions.It is thus deduced that the certainty equivalent control thresholds used in the revenue management problem have monotone properties.These structural properties add important managerial insights into the network revenue management system.展开更多
In airline revenue management,after differentiating products on each itinerary according to various restrictions,management needs to set the prices for the products.A deterministic joint pricing and seat allocation mo...In airline revenue management,after differentiating products on each itinerary according to various restrictions,management needs to set the prices for the products.A deterministic joint pricing and seat allocation model is proposed.It is reduced to a separable concave programming problem and thus readily solvable.Focusing on a special hub-to-hub airline network,monotonicity of the pricing decisions is explored.Using a nonlinear primal–dual technique,it is shown that some itineraries’optimal prices are decreasing,while some other itineraries’optimal prices are increasing with a capacity change in either a side leg or the middle leg.Such structural properties add important managerial insights into the pricing model for revenue managers in an airline company.展开更多
基金supported by the Major State Basic Research Development Program(973)of China(No.2011CB100400)Sci-technology Program of Guangdong Province(No.0203-E12147)
文摘The allelopathic potential of Rhus chinensis Mill on seedling growth of radish（Raphanus sativus L.）,semen cassiae（seed of Cassia obtusifolia L.） and black soyabean [Glycine max（L.） Merr.] was investigated under laboratory conditions.The water extracts of seed,leaf and bark of R.chinensis inhibited the germination and the growth of roots and shoots of radish,semen cassiae,and black soyabean.Significant increasing reductions in the germination and growth of roots and shoots were observed as the concentration of water extract increased in all bioassays.The order of allelopathic potentials of the three parts from R.chinensis plant on seed germination of these receptors was leaf [ seed [ bark.However,the inhibition of water extracts from R.chinensis seed on root activity of semen cassiae was more severe than from the other two parts.The allelopathic potential on the germination of radish was higher than that of black soyabean and semen cassiae.The integrated effect index for allelopathic potential of water extracts of leaf of R.chinensis on radish,semen cassiae and black soyabean seedling growth were-0.88,-0.93 and-0.98 respectively.The results suggested that it is important to minimize the negative allelopathic potential of R.chinensis in agroforestry systems,and to exploit this traditional Chinese medicinal tree for the production of natural bio-pesticides.
基金the Startup Grant of Scientific Research for Doctors of Luoyang Institute of Science and Technology,China(No.2011BZ12).
文摘In this paper,the structural properties of revenue management in a hubto-hub airline network is studied.Using a reformulated network flow version of the problem,it is shown that the optimal value has supermodularity,submodularity,and Lconcavity in the network’s capacities dimensions.It is thus deduced that the certainty equivalent control thresholds used in the revenue management problem have monotone properties.These structural properties add important managerial insights into the network revenue management system.
基金the Startup Grant of Scientific Research for Doctors of Luoyang Institute of Science and Technology(No.2011BZ12).
文摘In airline revenue management,after differentiating products on each itinerary according to various restrictions,management needs to set the prices for the products.A deterministic joint pricing and seat allocation model is proposed.It is reduced to a separable concave programming problem and thus readily solvable.Focusing on a special hub-to-hub airline network,monotonicity of the pricing decisions is explored.Using a nonlinear primal–dual technique,it is shown that some itineraries’optimal prices are decreasing,while some other itineraries’optimal prices are increasing with a capacity change in either a side leg or the middle leg.Such structural properties add important managerial insights into the pricing model for revenue managers in an airline company.
