The planning of production capacity for a company has been extensively discussed in literature. Seasonal demand of products or seasonal availability of input materials can make the problem even more challenging, as due to a constant need for capacity adjustments. For example, in contrast to conventional chemical processes, the use of biomass has several distinct characteristics like a time depe...

Driven by seasonality, many common recurrent infectious diseases are characterized by strong annual, biennial and sometimes irregular oscillations in the absence of vaccination programs. Using the seasonally forced SIR epidemic model, we are able to provide new insights into the dynamics of recurrent diseases and, in some cases, specific predictions about individual outbreaks. The analysis reve...

Recent innovations in ultrasonographic techniques have advanced our knowledge on the effects of seasonality on the changing populations of antral follicles in mares. The seasonal patterns in the monthly incidence of ovulations is at least partly a function of daylength, even at latitudes as low as 10o where the longest day may be less than 13 hours. Follicle dynamics involves a mid-anovulatory ...

the outbreak of sugarcane whitefly, neomaskellia andropogonis corbett has been recently recorded in sugarcane fields in khuzestan province. the seasonal population dynamics of n. andropogonis was investigated in sugarcane fields (cultivar cp69-1062) in amir kabir agro-industrial in khuzestan during 2006-2007. one hectar field in the middle of a large field (25 hectar areas) was selected randoml...

During 2000 and 2001, the prevalence of fungal diseases of alfalfa was surveyed underenvironmental conditions in Zanjan province, Iran. In total, 15 genera of fungal pathogens wereisolated from plants sampled from the fields. All of these disease interactions had not been previouslyrecorded in Zanjan and Colletotrichum truncatum, Leptotrochila medicaginis, Phoma medicaginis,Rhizoctonia crocorum...

The long-term dynamics of the calanoid copepod Eudiaptomus gracilis were analyzed in Lake Constance, a deep lake that has been influenced strongly by changes in trophic status and climate variability during the last few decades. Although copepod abundances remained rather stable throughout the study period (1970-1995), the seasonal pattern changed strongly, including a seasonal shift in the tim...

The seasonal dynamics of energy (lipid) storage in three neotropical fish species with differing life histories were evaluated. Lipid content was substantially greater in the liver than in dorsal musculature of all three species. Two piscivores (Cichla temensis and Serrasalmus manueli) showed large, statistically significant seasonal fluctuations in liver lipid content. Liver lipid content incr...

Understanding seasonal changes in age-related incidence of infections can be revealing for disentangling how host heterogeneities affect transmission and how to control the spread of infections between social groups. Seasonal forcing has been well documented in human childhood diseases but the mechanisms responsible for age-related transmission in free-living and socially structured animal popu...

The abundance and distribution of insect herbivores is determined by, among other things, plant quality and natural enemies. These two factors vary temporally and spatially, subsequently affecting seasonal population dynamics. The relative influence of plant quality and natural enemies on the seasonal dynamics of Bemisia tabaci (Gennadius) was investigated in a 3-yr field study in cotton. Plant...

No effects of experimental warming but contrasting seasonal dynamics for C-and N-cycle enzymes in a sub-arctic peat bog.