Understanding the characteristics of non-point sources (NPS) pollutions can provide theoretical support for improving water quality. Siheshui watershed located in south China was selected to explore the characteristics of NPS pollutions in rainfall-runoff process. In this small agricultural watershed, five flood events and one non-flood event were monitored, and the water quantity and quality c...

A three-dimensional meteorological model and a Lagrangian particle dispersion model are used to study the e€ects of a uniform large-scale wind on the dispersion of a non-reactive pollutant in a coastal region with complex terrain. Simulations are carried out both with and without a background wind. A comparison between model results and measured data (wind and pollutant concentrations) indicate...

internal bleaching technique is a common treatment option for discolored non-vital anterior teeth, but it is not advisable for cases with internal cervical resorption. therefore, other conservative bleaching techniques, such as external bleaching, may be proper treatment options in this situation. remaining discoloration should be covered by restorative options. the best choice for conservative...

Apparently, the buffering concept and the associated terminology are applicable if and only if the system under study has been structured in a particular way. Namely, the elements of a whole must be grouped into exactly two separate groups both of which can be condensed into a single function of a common variable. In the axiomatic definition of the signed probability measure t and the other thr...

We study a family of opinion formation models in one dimension where the propensity for a voter to align with its local environment depends non-linearly on the fraction of disagreeing neighbors. Depending on this non-linearity in the voting rule, the population may exhibit a bias toward zero magnetization or toward consensus, and the average magnetization is generally not conserved. We use a de...

The problem of minimally modifying a plan in response to changes in the specification of the planning problem has already been investigated in the literature. In this paper we consider the problem of non-minimal modification of plans from a computational point of view. We prove that while the general problem is intractable (that is, replanning from scratch is equally hard), there are scenarios ...

We consider non-conservative positive semigroups and obtain necessary sufficient conditions for uniform exponential contraction in weighted total variation norm. This ensures the existence of Perron eigenelements provides quantitative estimates spectral gap, complementing Krein–Rutman theorems generalizing probabilistic approaches. The proof is based on a non-homogenous h $h$ -transform semigro...