Anti-abrasion collagen fiber-based membrane functionalized by UiO-66-NH_(2)with ultra-high efficiency and stability for oil-in-water emulsions separation

Membrane separation strategies offer promising platform for the emulsion separation.However,the low mechanical strength of membrane separation layers and the trade-off between separation flux and efficiency present significant challenges.In this study,we report a CFM@UiO-66-NH_(2)membrane with high separation flux,efficiency and stability,through utilizing a robust anti-abrasion collagen fiber membrane(CFM)as the multifunctional support and UiO-66-NH_(2)by an in-situ growth as the separation layer.The high mechanical strength of the CFM compensated for the weakness of the separation layer,while the charge-breaking effect of UiO-66-NH_(2),along with the size sieving of its constituent separating layers and the capillary effect of the collagen fibers,contributed to the potential for efficient separation.Additionally,the CFM@UiO-66-NH_(2)membrane exhibited superhydrophilic properties,making it suitable for separating oil-in-water microemulsions and nanoemulsions stabilized by anionic surfactants.The membrane demonstrated remarkable separation efficiencies of up to 99.960%and a separation flux of370.05 L·m^(-2)·h^(-1).Moreover,it exhibits stability,durability,and abrasion resistance,maintaining excellent separation performance even when exposed to strong acids and alkalis without any damage to its structure and performance.After six cycles of reuse,it achieved a separation flux of 417.97 L·m^(-2)·h^(-1)and a separation efficiency of 99.747%.Furthermore,after undergoing 500 cycles of strong abrasion,the separation flux remained at 124.39 L·m^(-2)·h^(-1),with a separation efficiency of 99.992%.These properties make it suitable for the long-term use in harsh operating environments.We attribute these properties to the electrostatic effect resulting from the amino group on UiO-66-NH_(2)and its in-situ growth on the CFM,which forms a size-screening separation layer.Our work highlights the potential of the CFM@UiO-66-NH_(2)membrane as an environmentally friendly size-screening material for the efficient emulsion wastewater separation.

Coalfield structure and structural controls on coal in China

The occurrence of coal-bearing strata in a variety of coal-bearing basins of China is characterized by late tectonic deformation and remarkable spatial and geochronologic differences.The main controlling factors,which determine the tectonic framework of coalfields,include the geodynamic environment,tectonic evolution,deep structures,tectonic stress,and lithologic combination of the coal measures.The Chinese continent has experienced multi-stage tectonic movements since the Late Paleozoic.The spatial and temporal heterogeneity of its continental tectonic evolution,the complexity of its basement properties,and its stratigraphic configurations control the tectonic framework of its coalfields’present complex and orderly patterns.The concept of coal occurrence structural units is proposed in this paper and is defined as the structural zoning of coal occurrence.China’s coalfields are divided into five coal occurrence structural areas,and the structural characteristics of the coalfields in five main coal occurrence areas throughout the country are summarized.Based on the analysis of the relationship between the structure characteristics and occurrence of coal in these coalfields,the coal-controlling structures are divided into six groups:extensional structural styles,compressional structural styles,shearing and rotational structural styles,inverted structural styles,sliding structural styles,and syn-depositional structural styles.In addition,the distribution of coal-controlling structural styles is briefly summarized in this paper.

Cloning and characterization of an apolipoprotein C2 promoter in the mouse central nervous system

Apolipoprotein C2 is an important member of the apolipoprotein C family, and is a potent activator of lipoprotein lipase. In the central nervous system, apolipoprotein C2 plays an important role in the catabolism of triglyceride-rich lipoproteins. Studies into the exact regulatory mechanism of mouse apolipoprotein C2 expression have not been reported. In this study, seven luciferase expression vectors, which contained potential mouse apolipoprotein C2 gene promoters, were constructed and co-transfected with pRL-TK into HEK293T cells to investigate apolipoprotein C2 promoter activity. Luciferase assays indicated that the apolipoprotein C2 promoter region was mainly located in the ＋104 bp to ＋470 bp region. The activity of the different lengths of apolipoprotein C2 promoter region varied. This staggered negative-positive-negative arrangement indicates the complex regulation of apolipoprotein C2 expression and provides important clues for elucidating the regulatory mechanism of apolipoprotein C2 gene transcription.

面向区域教育的大数据公共服务模型探究

随着中国进入教育信息化2.0时代,各类教育公共服务平台的建设逐渐完善,数据服务是平台建设和维护不可或缺的部分。为了推动区域内教育大数据互联互通,提高教育数据服务质量,该研究提出了教育大数据公共服务模型。该模型明确了教育大数据服务主体和数据服务类型,梳理了服务主体与数据服务类型的供给关系和三种数据服务平台应该提供的数据服务。此外还分析了国家、区域和学校三个层面的平台应用案例,说明大数据公共服务模型可以通过数据服务对接其他教育服务平台,形成更加融合的数据互联共同体。

中外教育大数据研究热点与发展趋势——基于中国知网和科学网2010-2020年数据库的分析

教育大数据在教育信息化中的作用愈发凸显,挖掘教育数据潜在价值已经成为当前教育技术研究领域的重要课题。文章以中国知网(CNKI)和科学网(Web of Science)数据库的期刊论文为研究对象,以Hist Cite软件分析和内容分析法为主要研究方法,对比国内外教育大数据的研究热点与发展趋势。分析发现,“数据挖掘”“学习分析”等技术依然是教育大数据的技术研究热点,“思想政治教育”“人工智能”“智慧教育”等领域是目前国内教育大数据的热门研究方向,我国大数据标准正在走向国际并产生影响。

Correction to: Coalfield structure and structural controls on coal in China

Correction to:Int J Coal Sci Technol https://doi.org/10.1007/s40789-020-00326-z The original publication of the article contains incorrect notes in Fig.1.The correct version of notes in Fig.1 is provided in this erratum.Fig.1 Tectonic framework of coalfields in China.1—Paleogene–Neogene coal measure;2—Lower Cretaceous coal measure;3—Early-Middle Jurassic coal measure;4—Upper Triassic coal measure;5—Carboniferous–Permian coal measure;6—First-level structural boundary;7—Second-level structural boundary;I:Eastern compound deformation zone;II:Western compressional deformation zone;III:Middle transitional deformation zone;NECCA:North East China coal occurrence area;NCCA:North China coal occurrence area;NWCCA:Northwest China coal occurrence Area;SCCA:South China coal occurrence area;YXCA:Yunnan-Tibet(Xizang)China coal occurrence area.

On the status and role of social sports in urban development

The importance of social sports in urban development show that it makes the quality of urban residents greatly improved and becomes a strong surge of power to promote the development of economy; it makes the cultural connotations of the city more abundant and becomes the propeller of urban cultural development. And the specific roles show that it forms the group of physical and mental health in the city; it makes sports become an important part of people＇ s lives; it cultivates and enhances the citizens＇ sense of honor; it improves the urban management and enhances the image of the city.

Impacts of Fe2+on 5-aminolevulinic acid(ALA)biosynthesis of Rhodobacter sphaeroides in wastewater treatment by regulating nif gene expression

This study aimed to increase bacterial growth and 5-aminolevulinic acid（ALA） biosynthesis of Rhodobacter sphaeroides in wastewater treatment through adding ferrous ion（ Fe2＋ ）. Results demonstrated that Fe2＋ effectively enhanced the biomass production and ALA yield of R. sphaeroides. Moreover, the optimal Fe2＋ dosage was found to be 400 μmol/L, which was associated with the highest biomass of 4015.3 mg/L and maximum ALA yield of 15.9 mg/g-dry cell weight（mg/g-DCW）. Mechanism analysis revealed that Fe2＋ vastly improved Adenosine Triphosphate（ATP） production by up-regulating the nif gene expression, and increasing ATP enhanced the biomass and ALA yield by supplying energy for bacterial growth and ALA biosynthesis, respectively. Correlation analysis showed that the ALA and ATP yields had positive relation with nifA and nifU gene expression. In addition, the nifA and nifU gene expression displayed high consistency of co-transcription at the optimal Fe2＋ dosage.