Simultaneously Efficient Solar Light Harvesting and Charge Transfer of Hollow Octahedral Cu2S/CdS p–n Heterostructures for Remarkable Photocatalytic Hydrogen Generation

Solar-driven water splitting is a promising alternative to industrial hydrogen production. This study reports an elaborate design and synthesis of the integration of cadmium sulfide (CdS) quantum dots and cuprous sulfide (Cu₂S) nanosheets as three-dimensional (3D) hollow octahedral Cu₂S/CdS p–n heterostructured architectures by a versatile template and one-pot sulfidation strategy. 3D hierarchical hollow nanostructures can strengthen multiple reflections of solar light and provide a large specific surface area and abundant reaction sites for photocatalytic water splitting. Owing to the construction of the p–n heterostructure as an ideal catalytic model with highly matched band alignment at Cu₂S/CdS interfaces, the emerging internal electric field can facilitate the space separation and transfer of photoexcited charges between CdS and Cu₂S and also enhance charge dynamics and prolong charge lifetimes. Notably, the unique hollow Cu₂S/CdS architectures deliver a largely enhanced visible-light-driven hydrogen generation rate of 4.76 mmol/(g·h), which is nearly 8.5 and 476 times larger than that of pristine CdS and Cu₂S catalysts, respectively. This work not only paves the way for the rational design and fabrication of hollow photocatalysts but also clarifies the crucial role of unique heterostructure in photocatalysis for solar energy conversion.

     

Activity Achievement Emotions and Academic Performance: A Meta-analysis

Educational Psychology Review - Achievement emotions are emotions linked to academic, work, or sports achievement activities (activity emotions) and their success and failure outcomes (outcome...     

在线学习中互动讨论模式如何影响学习者的批判性思维

互动讨论作为在线学习的重要组成部分,普遍被用于培养学生批判性思维,然而尚未有文献研究在线学习中互动讨论模式与批判性思维之间的关系.文章采用定量内容分析和滞后序列分析,对在线互动讨论中1411条消息进行话语分析,探究在线学习中教师角色变化对学生互动讨论模式和批判性思维的影响,并挖掘互动讨论模式与批判性思维的隐含关系.结果发现:教师辅助的在线互动讨论比教师主导时学生的互动讨论模式更丰富、讨论更深入,批判性思维水平更高.同时,文章提出基于四个阶段的在线互动讨论模式与批判性思维的关系模型,准确把握在线学习环境中的教师角色,为高效利用教师角色变化规律提高在线互动质量和批判性思维水平提供可行的理论借鉴和策略参考.     

Screening beneficial bacteriostatic lactic acid bacteria in the intestine and studies of bacteriostatic substances

Lactic acid bacteria(LAB) are a representative probiotic. As the dominant flora in the human intestinal tract, LAB can regulate the balance of human intestinal flora and improve host health. The purpose of this study was to isolate and screen LAB that are well suited to the intestinal characteristics of the Chinese population, with excellent probiotics and high antibacterial activity. After 16 S ribosomal RNA(rRNA) homology and phylogenetic tree analysis, potential probiotics were tested for their antibacterial activity, resistance to artificial gastrointestinal fluid and drugs, surface hydrophobicity, and safety.Three strains of LAB with acid resistance, bile salt resistance, epithelial cell adhesion, and no multidrug resistance were selected: Lactobacillus salivarius, Leuconostoc lactis, and Lactobacillus paracasei. Analysis of the antibacterial active substances in the three strains and their fermentation broths revealed that the main antibacterial substances of L. lactis were organic acids, whereas those of L. salivarius and L. paracasei were organic acids and bacteriocins with broad-spectrum antibacterial activity. These three strains of probiotic LAB with high antibacterial activity were identified as bacterial resources that could potentially be used to develop probiotic preparations for the prevention and treatment of intestinal diseases caused by intestinal pathogens.     

产教融合背景下轨道交通类专业协同育人教学模式改革

随着经济社会和高等教育的发展,具有轨道交通类专业知识和操作技能的高素质应用型人才已成为社会的迫切需求。为确保轨道交通类专业人才的输出质量,近年来地方本科高校加强与当地企业开展校企合作、深化产教融合,加快高等教育内涵发展,已成为地方应用型本科院校教育改革的必经之路。以大连科技学院为例,从专业框架重构、校企协同育人教学模式改革等方面,探索轨道交通类专业的建设路径,以适应轨道交通产业的用人需要。     

在线旅游企业微博形象及提升策略研究

为分析国内主要在线旅游企业微博形象及其提升策略, 选取国内8家在线旅游企业的新浪微博作为研究对象, 在新浪微博中抓取与这些企业相关的微博内容;采用内容分析法从情感倾向和评价角度分析了这些企业的微博形象, 并重点分析了这些企业负面微博形象产生的原因。研究发现, 产生在线旅游企业负面微博形象的主要原因有两方面:一是企业服务提供失误;二是员工客户服务失误。在此基础上有针对性地提出了提升在线旅游企业微博形象的策略和方法。     

试述图书馆信息服务新模式

分析图书馆传统信息服务模式及其特点,从对几种关系的解析中探讨图书馆信息服务的新模式。     

Web页面表格信息的自主抽取

本文研究对于Web页面表格信息的抽取方法,通过对初始页面标注以获取抽取知识,并通过自学习适应页面的变化,有效地完成对表格信息的抽取。     

关于旧大陆早期人类文化发展格局——百色手斧挑战“莫氏线”

距今80万年以手斧为特色的广西百色石器工业,展示了与西方阿舍利文化相似的技术面貌.用与石器共生的玻璃陨石测定的同位素年龄证明,东亚早期人类的文化发展进程与西方同步.这一事实极大地冲击了西方流行的"莫氏线"理论的基础,加强了重新审视旧大陆东西方早期人类文化发展格局的必要性.     

中国沿海港口建设状况及发展趋势

我国沿海港口发展经历了恢复发展、快速发展及高速发展三个典型时期,成为了世界港口大国。随着全球经济下行及我国经济进入中高速增长新常态,我国沿海港口也已进入平稳发展阶段。考虑我国经济形势及环境制约因素,文章分析了我国沿海港口在以后一段时期的发展趋势及面临的挑战,"一带一路"等国家战略为我国港口的转型升级和一体化发展带来新的机遇,绿色港口、智慧港口将是我国沿海港口今后建设发展的主要方向,据此提出了相关应对措施建议。