构建“1421模式”提升课程育人实效——以物理化学课程群建设为例

安庆师范大学省级物理化学教学团队,立足地方化学化工支柱产业需求,把握学校办学定位,依托国家级一流专业建设点和省级工程中心平台,以一个教研室基层党支部为核心引领,四个课堂互融互通,优化迭代线上线下两方面课程资源,按照课程内容的逻辑顺序和时空维度,持续建设一个特色物理化学课程群。通过历年实践所构建的“1421”理工类专业课程建设模式,为课程思政的持续深入开展提供了坚实基础,课程育人效果显著,可为高校理工类专业课开展课程思政提供一定借鉴。

Synergistic effect of vermiculite and submerged plants on lake sediments

The synergistic effect of vermiculite and the submerged macrophytes Vallisneria spiralis and Hydrilla verticillata on lake sediment was studied using diffusive gradients in thin films(DGT)technology.The dynamics of phosphorus(P)fractions in sediment,the labile-P and labile-S in the water-sediment continuum,and the microbial community in the rhizosphere were studied.Vermiculite effectively promoted reproduction of microorganisms in the sediments Microbial abundance in treatments containing V.spiralis with sediments containing 10%added vermiculite,and H.verticillata containing 50%added vermiculite being 1.7 and 3.5 times higher than the controls which contained no added vermiculite.Acidobacteria and Proteobacteria populations,which are both beneficial for the sediment microenvironment,were higher in treatment groups containing vermiculite.The bioavailable-P in treatment groups containing added vermiculite was lower at the sediment-water interface,with a correlating decrease of TP by between 63%and 91%in the overlying water.This suggests that vermiculite can affect the release of labile P and facilitate the assimilation of nutrients by macrophyte roots.Additionally,vermiculite can improve the Oxidation-Reduction potential and further reduce sulfide toxicity to plants.These results provide theoretical guidance and technical support for the application of vermiculite combined with submerged plants for the remediation of eutrophic lakes.

Dendrite-free all-solid-state lithium batteries with lithium phosphorous oxynitride-modified lithium metal anode and composite solid electrolytes

Dendrite formation on lithium (Li) metal anode is a key issue which hinders the development of rechargeable Li battery seriously. A novel method for suppress!ng Li dendrites via using Li phosphorous oxynitride (UPON) modified Li anode and Li1.5Al0.5Ge1.5(PO4)3-poly(ethylene oxide)(Li bistrifluoromethane-sulfonimide)(LAGP-PEO(LiTFSI)) composite solid electrolyte in all-solid-state Li battery is proposed, and the effect of the thickness of UPON on Li anode performarice is also studied. LiPON film with a thickness of 500 nm exhibits satisfactory interface property between Li metal anode and the LAGP-PEO(LiTFSI) solid electrolyte. The LiPON film provides a uniform Li^+ flux across the interface and effectively inhibits the formation of Li dendrites in all-solid-state Li batteries. The assembled all-solid-state Li cell Li(LiPON)/LAGP-PEO(LiTFSI)/LiFePO4 delivers an initial discharge capacity of 152.4 mAh·g^-1 and exhibits good cycling stability and rate performanee at 50 ℃.

Effects of vermiculite on the growth process of submerged macrophyte Vallisneria spiralis and sediment microecological environment

Ecological restoration is one of the hot technologies for the reconstruction of eutrophic lake ecosystems in which the restoration and propagation of submerged plants is the key and difficult step. In this paper, the effect of vermiculite on the growth process of Vallisneria spiralis and sediment microenvironment were investigated, aiming to provide a theoretical basis for the application of vermiculite in aquatic ecological restoration. Results of growth indexes demonstrated that 5% and 10% vermiculite treatment groups statistically promote the growth of Vallisneria spiralis compared to the control. Meanwhile, the results of ecophysiological indexes showed that photosynthetic pigment, soluble sugar content, superoxide dismutase(SOD), and catalase(CAT) activity of 5% and 10% group were increased compared with the control while the malondialdehyde(MDA) content exhibited the opposite result(p < 0.05), which illustrated that vermiculite can improve the resistance of plants and delay the aging process of Vallisneria spiralis. In addition, result of PCA(Principal Component Analysis) demonstrated 5% and 10% group has improved the sediment physical conditions and create more ecological niche for microorganisms directly, and then promoted the growth of plants. The dissolution results showed that vermiculite can dissolve the constant and trace elements needed for plant growth. Furthermore, the addition of vermiculite increased the diversity of microorganisms in the sediments, and promoted the increase of plant growth-promoting bacteria and phosphorus-degrading bacteria. This study could provide a technique reference for the further application of vermiculite in the field of ecological restoration.

Pediatric cancer surveillance in China:A hospital-based introduction

Background In recent years,increasing numbers of families have been affected by childhood cancer.According to data from the International Agency for Research on Cancer(IARC)of the World Health Organization,approximately 279000 new cases of cancer were predicted in children and adolescents aged 0–19 years worldwide in 2020.The global incidence of childhood cancer is 10.9 per 100000(global standard rate)and the mortality rate is 4.2 per 100000.1 According to data from the China National Cancer Center,the incidences of cancer in 2017 were 9.9 per 100000 in children aged 0–14 years and 11.5 per 100000 in adolescents aged 15–19 years.2 There are estimated to be approximately 22000 new cases of childhood cancer in China each year,and the incidence of malignant tumors in children aged 0–14 years has increased by 2.5%annually in the past decade.