图书馆员网络社区信息交流行为实证研究——“大旗底下”QQ群个案分析

以"大旗底下"QQ群为个案,通过对聊天记录文本和在线问卷调查的定量分析,展现了图书馆员在网络社区中的信息交流行为特征规律,并探讨了网络社区信息交流对图书馆员精神世界的影响。论文认为,可以充分利用Web2.0技术所带来的信息交流的便利和迅捷,让更多的图书馆员融入到各种专业社区中,在跨地域、跨部门的信息交流中分享专业工作经验和成功的喜悦,在信息交流中不断汲取图书馆职业精神的养分,从而有效培育起对图书馆现代理念和核心价值观的社会认同,以此推动图书馆事业的健康发展

当代中国知识分子的图书馆认同变迁研究——基于《读书》杂志(1979-2009)的文本分析

以书为媒,知识分子与图书馆有着深厚的不解之缘。通过对《读书》杂志30年来所刊载的与图书馆相关的1047篇文章进行分析,发现"阅读情结"一直是维系知识分子图书馆认同的核心因素。随着时代发展和社会思潮变迁,在不同的发展阶段,当代中国知识分子图书馆认同的内涵也随之发生变化:从"思想自由的认同",到"以人为本的认同",再到"民主保障的认同"。在与社会互动推进图书馆事业发展的进程中,展示出当代中国知识分子群体勇于解放思想、兼济天下、敢为人先的时代精神

Material and Energy Conversion of Integrated 100,t/a-Scale Bio-Jet Fuel-Range Hydrocarbon Production System via Aqueous Conversion of Biomass

以农业废弃物生物质为原料，利用水相转化技术，进行了百吨/年规模生物航油类烃(C8~C15)合成试运行.过程中采用两步酸解法分别将玉米秸秆中半纤维素和纤维素转化为糠醛和乙酰丙酸，作为生物质基平台化合物.在碱性条件下糠醛与乙酰丙酸经Aldol缩合反应实现碳链增长，生成的长链含氧中间体经过低温预加氢、高温加氢脱氧及精制，生成C8~C15范围内液态烃，可作为生物航油组分.以试运行实验结果为基础，进行了过程的物质与能量转化分析.结果表明，该路线获得液态烃类的基本性质满足合成航油ASTM-7566标准要求，并充分利用了原料中纤维素和半纤维素组分，是一条基于生物质的长链液态烃合成路线，1t航油约需10~12t干基玉米秸秆

Progress of Organic Chemistry(2011～2012)

本文综述了中国大陆地区有机化学研究人员2011至2012年两年内在合成方法学、有机合成化学、元素有机化学以及天然产物化学等领域获得的重要成果。文章中共引用参考文献355篇,其中110多篇手性金属配合物和有机小分子催化的不对称反应、金属催化的碳氢键活化等合成方法学论文和30余篇氟有机化学论文基本来源于德国《应用化学》(国际版)和《美国化学杂志》。本文汇集了中国有机化学家两年中合成的150多个具有生物活性和化学结构多样性的天然产物,其中不乏具有高度挑战性的复杂天然分子。在近两年中中国有机化学家从陆地和海洋的生物体内发现各种不同类型新天然产物90多个。This biennale report reviewed the major achievements of organic chemistry involved to synthetic methodologies,synthetic chemistry,element-organic chemistry,and natural product chemistry in Mainland of China.There were 355 references cited in this report.Among them,about 110 papers related to the synthetic methodologies as well as about 30 papers of organofluorine chemistry reported herein were collected solely from ACIE and JACS.The report presented the synthesis of more than 150 natural products with diverse chemical structures and bioactivities,including some complex molecules with high synthetic challenge as well as the isolation of more than 90 new natural products with various structural types from continental or /and marine creatures,which were reported by Chinese chemists in 2011 ~ 2012

A New Mathematics Model of the Temperature Programmed Analysis Technology

以表面作用包括表面吸/脱附以及表面反应本征速率方程为基础,提出新的程序升温分析技术(TPAT)的数学模型。与经典的理论模型相比,这种新的TPAT理论模型更接近实际的程序升温分析实验过程。设计和进行特定催化剂的TPd、TPr及TPO实验,得到相应的程序升温谱图,采用新的TPAT理论模型模拟上述谱图,计算出相应的表面作用活化能等重要热力学参数。结果表明,新的理论模型具有良好的模拟性能,平均相对误差(Ard)小于1%。Based on the surface effect including surface adsorption/desorption and intrinsic kinetics rate equation,a new mathematical model of the temperature programmed analysis technology was proposed.This model is different from the classical TPAT theory models,which indicates much more coincidence with the actual reactions than other models.TPAT(TPD,TPR and TPO) experiments were designed and carried out to receive their profiles.Based on these profiles of TPAT and the simulated experiments,the novel theory model was designed and the thermodynamics parameters(such as activation energy,etc.) were deduced and calculated by this model.The results show that this model has excellent simulation with the actual experiments,and the average relative errors are easily controlled less than 1%

Development of cathode material LiFePO_4 in lithium ion battery

[中文文摘]LiFePO4作为一种新型的锂离子电池正极材料,安全性好,价格低廉,环境友好,循环性能稳定。结合本实验室的研究工作,从合成方法,表征手段,循环性能和电导率等方面综述了近年来LiFePO4的发展概况,并提出了LiFePO4进一步可能的发展趋势。[英文文摘]As a cathode material of lithium ion battery, LiFePO4 possesses some excellent characteristics such as good safety, low cost, environment friendly and satisfactory cycle stability. In this paper, the development of LiFePO4 in recent years is discussed in terms of synthesizing methods, characterization ways, cycling performance and electronic conductivity. The prospect of LiFePO4 in the future is also presented.973项目(2002CB211800); 国家自然科学基金(20373058); 福建省科技项目(2003H044)资助

Comparison Of The Quasi-Static Method And The Dynamic Method For Simulating Fracture Processes In Concrete

Concrete is heterogeneous and usually described as a three-phase material, where matrix, aggregate and interface are distinguished. To take this heterogeneity into consideration, the Generalized Beam (GB) lattice model is adopted. The GB lattice model is much more computationally efficient than the beam lattice model. Numerical procedures of both quasi-static method and dynamic method are developed to simulate fracture processes in uniaxial tensile tests conducted on a concrete panel. Cases of different loading rates are compared with the quasi-static case. It is found that the inertia effect due to load increasing becomes less important and can be ignored with the loading rate decreasing, but the inertia effect due to unstable crack propagation remains considerable no matter how low the loading rate is. Therefore, an unrealistic result will be obtained if a fracture process including unstable cracking is simulated by the quasi-static procedure

Lattice type of fracture model for concrete

Concrete is usually described as a three-phase material, where matrix, aggregate and interface zones are distinguished. The beam lattice model has been applied widely by many investigators to simulate fracture processes in concrete. Due to the extremely large computational effort, however, the beam lattice model faces practical difficulties. In our investigation, a new lattice called generalized beam (GB) lattice is developed to reduce computational effort. Numerical experiments conducted on a panel subjected to uniaxial tension show that the GB lattice model can reproduce the load-displacement curves and crack patterns in agreement to what are observed in tests. Moreover, the effects of the particle overlay on the fracture process are discussed in detail. (C) 2007 Elsevier Ltd. All rights reserved

非均质材料准脆性损伤断裂的广义梁链网模型

陶瓷、岩石和混凝土等非均质材料的准脆性损伤断裂,既不同于玻璃的理想脆性断裂,又有别于金属材料的韧性断裂。本研究建立了该类材料的微观断裂力学模型——广义梁链网模型~([1,2]),根据应力重分配的思想实现渐进失效的模拟。重点考虑了三个方面的问题:1.微结构预应力的影响~([3,4])。微结构预应力是指混凝土风干过程中基体与骨料间的非协调变形导致的初始非零应力场。研究表明,微结构预应力可显著提升材料的延展性,并且造成卸载后不可恢复的变形。2.惯性效应~([5,6])。在新裂纹生成的瞬间,其表面邻域内物质点突然获得非零的加速度,将产生应力波。研究表明,该动态效应将导致加载曲线的震荡特性。我们发展了一种动静结合的算法,既能够捕捉局部断裂导致的惯性效应,又能很大程度上避免计算量的激增(与纯动态算法相比)。3.纸等纤维编织材料的撕裂~([7,8])。考虑了纤维-纤维结合键与纤维的断裂两种微观失效机制,分析了纤维长度、结合键强度等因素对断裂性能的影响