[Variation Characteristics of PM Pollution and Transport in Typical Transport Channel Cities in Winter].

Taking Handan, Xingtai, Hengshui, and Cangzhou, four cities in southwest Hebei Province along the Beijing-Tianjin-Hebei typical transport route, as examples, we analyzed the variation characteristics of 3a meteorological conditions and PM concentration in winter from 2019 to 2021 and used potential source contribution analysis (PSCF) and concentration weight analysis (CWT) to identify the transport characteristics of PM in the four cities during the study period. Based on the meteorological air quality model (WRF-CMAQ) transmission matrix method and transport flux method, the contribution of PM transport between Handan, Xingtai, Hengshui, and Cangzhou and the surrounding areas was quantitatively assessed; the vertical distribution characteristics of PM net transport flux were revealed; and the two main transport routes of PM pollution were further identified. The results showed that during the study period, the PM concentration decreased by 45.

A review of the technology and applications of methods for evaluating the transport of air pollutants.

A variety of methods based on air quality models, including tracer methods, the brute-force method (BFM), decoupled direct method (DDM), high-order decoupled direct method (HDDM), response surface models (RSMs) and so on forth, have been widely used to study the transport of air pollutants. These methods have good applicability for the transport of air pollutants with simple formation mechanisms. However, differences in research conclusions on secondary pollutants with obvious nonlinear characteristics have been reported.

An Analysis of Students' Work Values Education Strategies and Environment Based on Psychological Contract.

An implicit agreement between people and organizations is known as a psychological contract. It represents what each party anticipates from the other in terms of giving and receiving. The psychological contract theory has forced ideological and political educators to adapt their ideas and develop new teaching strategies.

Phylogenetic conservatism and trait correlates of spring phenological responses to climate change in northeast China.

Climate change has resulted in major changes in plant phenology across the globe that includes leaf-out date and flowering time. The ability of species to respond to climate change, in part, depends on their response to climate as a phenological cue in general. Species that are not phenologically responsive may suffer in the face of continued climate change.