情感教育视域下特殊教育师生关系的偏倚及回归

师生关系具有丰富的情感价值,其状况直接影响特殊学生在校的学习生活与特殊教育质量.基于情感教育理论视域,实践中,特殊教育师生关系囿于传统观念、教师情感素质、学生生理或心理功能缺失的影响,日益显现出重知识轻情感、单一线性及生活与人身的过度依赖等偏倚现象.特殊教育中师生关系情感偏倚的原因在于,部分特殊教育教师情感素质与教育敏...     

网络环境下地市级图书馆地方文献资源建设

探索网络环境下地市级图书馆加强地方文献建设的重要性,提出应采取的对策。     

高校图书馆电子资源管理与维护若干问题——以复旦大学图书馆为例

通过对复旦大学图书馆电子资源管理和维护方面的综合分析,尝试探索高校图书馆电子资源管理与建设的有效方式。     

客户价值评价体系在商业银行信息化中的应用分析

从客户价值的定义入手,提出银行客户价值评价的指标体系,并就构建客户价值体系的数据模型及其在银行信息化中的应用进行具体分析。     

环境影响评价与环境工程教学实践

文章提出开展对建设项目的环境影响评价,提高了教师的理论水平和解决实际环境污染问题的能力,丰富了环境工程课堂教学内容,促进了科研水平提高,带动了本科生污染源调查实习和毕业实习,拓展了毕业论文选题空间和研究内容。     

Recent progress in reactivity study and synthetic application of N-heterocyclic phosphorus hydrides

N-heterocyclic phosphines (NHPs) have recently emerged as a new group of promising catalysts for metal-free reductions, owing to their unique hydridic reactivity. The excellent hydricity of NHPs, which rivals or even exceeds those of many metal-based hydrides, is the result of hyperconjugative interactions between the lone-pair electrons on N atoms and the adjacent σ^*(P–H) orbital. Compared with the conventional protic reactivity of phosphines, this umpolung P–H reactivity leads to hydridic selectivity in NHP-mediated reductions. This reactivity has therefore found many applications in the catalytic reduction of polar unsaturated bonds and in the hydroboration of pyridines. This review summarizes recent progress in studies of the reactivity and synthetic applications of these phosphorus-based hydrides, with the aim of providing practical information to enable exploitation of their synthetically useful chemistry.     

(NH4)3B11PO19F3: a deep-UV nonlinear optical crystal with unique [B5PO10F]∞ layers

Deep-ultraviolet (DUV) nonlinear optical (NLO) crystals that can extend the output range of coherent light below 200 nm are pivotal materials for solid-state lasers. To date, KBe₂BO₃F₂ (KBBF) is the only usable crystal that can generate DUV coherent light by direct second harmonic generation (SHG), but the layered growth habit and toxic ingredients limit its application. Herein, we report a new fluoroborophosphate, (NH₄)₃B₁₁PO₁₉F₃ (ABPF), containing four different functional units: [BO₃], [BO₄], [BO₃F] and [PO₄]. ABPF exhibits a KBBF-like structure while eliminating the limitations of KBBF crystal. The unique [B₅PO₁₀F]_∞ layers enhance ABPF’s performance; for example, it has a large SHG response (1.2 × KDP) and a sufficient birefringence (0.088 at 1064 nm) that enables the shortest phase-matching wavelength to reach the DUV region. Meanwhile, the introduction of strong B-O-P covalent bonds decreases the layered growth habit. These findings will enrich the structural chemistry of fluoroborophosphate and contribute to the discovery of more excellent DUV NLO crystals.     

国际科学学主题共词网络的可视化研究

采用可视化手段对国际科学学与科学计量学领域中六种核心期刊的高频关键词的共词网络进行了分析,利用社会网络分析的方法对共词网络进行聚类。研究表明,科学、技术和创新活动的研究是科学学与科学计量学的主题。并在此基础上对科学学研究的若干热点、未来的研究方向进行了预测。