In cloud computing, a provider leases its computing resources in the form of virtual machines to users, and a price is charged for the period they are used. Though static pricing is the dominant pricing strategy in today’s market, intuitively price ought to be dynamically updated to improve revenue. The fundamental challenge is to design an optimal dynamic pricing policy, with the presence of…
Abstract. Water-soluble fullerene derivatives have often been used as effective scavengers for reactive oxygen species. Three amphiphilic amino acid C60 derivatives, b-alanine C60 derivative, cystine C60 derivative and arginine C60 derivative have been synthesized and characterized. Because of the hydrophobic interaction, the amino acid C60 derivatives could self-assemble to form spherical…
Abstract. We have developed a novel heterogeneous metallophthalocyanine catalyst, Co-TDTAPc–ACF, by immobilizing cobalt tetra(2,4-dichloro-1,3,5-triazine)aminophthalocyanine (Co-TDTAPc) on activated carbon fiber (ACF) covalently. The oxidative removal of 4-nitrophenol (4-NP) in the Co-TDTAPc–ACF/ H2O2 system, based on phase transfer catalytic oxidation, was investigated in aqueous solut…
ABSTRACT AtmosphericCO2 is expected to increase to between 550 ppm and 1000 ppm in the next century. CO2-induced changes in plant physiology can have ecosystem-wide implications and may alter plant-plant, plant-herbivore and plant-symbiont interactions.We examined the effects of three concentrations of CO2 (390, 800 and 1000 ppm) and two concentrations of nitrogen fertilizer (0.004 g N/week ve…