Research Progress on the Effects of Dietary Fiber Regulating Gut Microbiota on Sows Reproductive Performance

Dietary fiber(DF)is an essential nutrient in sow diet.It can increase sow satiety and prevent constipation.It can also regulate sow gut microbiota,and the interaction between the two can regulate sows reproductive performance and metabolic function and the growth performance of offspring piglets.It can be seen that the benefits of DF in sow production are inseparable from the interaction of gut microbiota.This paper reviewed the effects of DF on the diversity of sows gut microbiota,and the effects of DF-gut microbiota interaction on sows gut microbiota,metabolism,ovulation and lactation,as well as on offspring production performance,aiming to provide a new strategy for the application and research in sow diet.

Practical Logic and Optimization Path of the Effectiveness of Teaching Methods in Ideological and Political Theory Courses

Since the Party Central Committee has explicitly requested the running of excellent ideological and political theory courses,the teaching methods of ideological and political theory courses have become a major topic of discussion in academic circles.A gap remains between the current teaching methods of ideological and political theory courses and those in the new era.In order to improve the nurturing effect of key courses,it is necessary to study the basic logic of its effectiveness enhancement from the perspective of practice.In the new era,it is essential to take the spirit from the series of important speeches of the Party and national leaders on ideological and political theory courses as guidance,draw on the effective teaching ideas of Comenius that reflect“fun,”“convenience,”and“thoroughness,”closely combine the teaching practice,as well as select and apply the teaching methods based on the concept of three“combinations”and two“innovations,”i.e.,combining students,teachers’teaching styles,and teaching contents;and innovating and practicing the integrated teaching method of diversified integration as well as the new teaching method of media technology-integrated smart classroom.

A comprehensive review of the modeling of transport phenomenon in the flow channels of polymer electrolyte membrane fuel cells

Reactant gas and liquid water transport phenomena in the flow channels are complex and critical to the performance and durability of polymer electrolyte membrane fuel cells.The polymer membrane needs water at an optimum level for proton conductivity.Water management involves the prevention of dehydration,waterlogging,and the cell’s subsequent performance decline and degradation.This process requires the study and understanding of internal two-phase flows.Different experimental visualization techniques are used to study two-phase flows in polymer electrolyte membrane fuel cells.However,the experiments have limitations in in situ measurements;they are also expensive and time exhaustive.In contrast,numerical modeling is cheaper and faster,providing insights into the complex multiscale processes occurring across the components of the polymer electrolyte membrane fuel cells.This paper introduces the recent design of flow channels.It reviews the numerical modeling techniques adopted for the transport phenomena therein:the two-fluid,multiphase mixture,volume of fluid,lattice Boltzmann,and pressure drop models.Furthermore,this work describes,compares,and analyses the models’approaches and reviews the representative results of some selected aspects.Finally,the paper summarizes the modeling perspectives,emphasizing future directions with some recommendations.

Valorization of poly-β-hydroxybutyrate(PHB)-based bioplastic waste in anaerobic digesters of food waste for bioenergy generation:reactor performance,microbial community analysis,and bioplastic biodegradation

This study aims to investigate the significance and biodegradation pathways of PHB-based bioplastic in anaerobic digesters treating food waste,where the reactor performance of changed methane generation,bioplastic biodegradation efficiency,and bioinformatic analysis of functional microbes were emphasized.The results showed that PHB-based plastic film could be partially biodegraded in the food waste digester,and a bioaugmentation use of Alcaligenes Faecalis(AF)and Bacillus Megaterium(BM)was beneficial to largely accelerate the degradation process through a beneficial shift of both the functional bacterial and archaeal species.Microbial community analysis indicated that the major bacterial species belonged to genera Candidatus_Cloacimonas,Rikenellaceae,and Defluviitoga,while the dominant methanogenic archaeal species belonged to genera Methanomassiliicoccus,Methanosarcina,and Methanosaeta.Bioplastic biodegradation analysis suggested that the optimal fractions of AF and BM for PHB-based plastic degradation were 50% AF and 75% BM,respectively,which deserves further optimization and scale-up validation.The finding of this study would contribute to the combined management of PHB-based bioplastic with food waste for clean energy recovery and a greener environment.