3,124 research outputs found
AN EMPIRICAL STUDY ON PARENTS' CHOICES APPLY ON ALTERNATIVE EDUCATION: A CASE STUDY OF T SCHOOL IN BEIJING
Since the end of the 20th century, education reform has been carried out all over the world. In one hand, the system of public school education cannot be recognized and satisfied by parents, and alternative education is one of the replacements. Through ethnographic research, the author participated in school activities, interview parents and micro-school APP interaction simultaneously, and use snowball sampling method to expand the depth and breadth of interviews. The purpose of this paper is to find out the differences between the school-running visions declared by schools verses the educational choices applied to parents. Try to classify what kind of parents will choose alternative education, and to reflect on the public education reform through their practices
Second-Coordination Sphere Effects on the Chemo-Selectivity of Nonheme Iron Dioxygenases. A Computational Study.
Phenotypic switching of populations of cells in a stochastic environment
In biology phenotypic switching is a common bet-hedging strategy in the face
of uncertain environmental conditions. Existing mathematical models often focus
on periodically changing environments to determine the optimal phenotypic
response. We focus on the case in which the environment switches randomly
between discrete states. Starting from an individual-based model we derive
stochastic differential equations to describe the dynamics, and obtain
analytical expressions for the mean instantaneous growth rates based on the
theory of piecewise deterministic Markov processes. We show that optimal
phenotypic responses are non-trivial for slow and intermediate environmental
processes, and systematically compare the cases of periodic and random
environments. The best response to random switching is more likely to be
heterogeneity than in the case of deterministic periodic environments, net
growth rates tend to be higher under stochastic environmental dynamics. The
combined system of environment and population of cells can be interpreted as
host-pathogen interaction, in which the host tries to choose environmental
switching so as to minimise growth of the pathogen, and in which the pathogen
employs a phenotypic switching optimised to increase its growth rate. We
discuss the existence of Nash-like mutual best-response scenarios for such
host-pathogen games.Comment: 17 pages, 6 figure
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