Dynamic Origin of the S-shape Demand Curve:A Population Model of Fashion Goods with Social Interaction among Consumers S形需求曲线的动态起源——消费者社会相互作用下时尚商品的群体模型 A bend or curve, especially in a shoreline. 弯曲,弓形弯曲或弓形,尤指海岸线 ...
However, even the structure of growth curve has not been revealed yet because long-term extrapolations by proposed models of S-shaped curves are unstable and it has been very difficult to predict the long-term growth and final adopter population. This paper studies the S-shaped growth from ...
With the decrease in rural population migration and birth rates, the urban population growth rate slows down, and the rate of urban spatial expansion gradually decreases. Currently, in many parts of China, young people go out to work while the elderly and children stay in rural areas, ...
guizhouensis had not undergone a recent population expansion. For the nuclear genes, all values were non-significant except for significant negative values of Fu’s Fs for all three genes, which suggested the presence of population growth or recombination44. Mismatch distribution analyses displayed ...
The evolutionary origin and historical demography of extant Arcto-Tertiary forest species in East Asia is still poorly understood. Here, we reconstructed the evolutionary and population demographic history of the two extant Euptelea species in China (E.
It also describes the dynamics of the fish population with natural predation. In this paper we discuss the existence of multiple positive solutions leading to the occurrence of an S-shaped bifurcation curve. We prove our results by the method of sub-supersolutions....
Here 1 λ is the diffusion coefficient and K , c and ϵ are positive constants. This model describes the steady states of a logistic growth model with grazing and constant yield harvesting in a spatially homogeneous ecosystem. It also describes the dynamics of the fish population with natural...