微信下计算机文化基础自主学习模式的建构

微信作为信息技术领域的一项新生事物,已经成为大学生日常交流和沟通必不可少的工具,利用微信平台的功能及优势,引导学生自主学习,从兴趣、探究、协作三方面来建构微信环境下的计算机文化基础课程的自主学习模式,为高校计算机文化基础教学的网络化发展提供了新的方向。     

从化学物质管理到产品管理的最新技术体系

介绍化学品从传统的物质管理到产品管理的体系现状,从物质使用环节入手,减少有害化学物质的倒逼化学品环境管理模式,以至实现有毒有害化学物质的全过程管控。发达国家通过实施政策法规和环境标签非强制手段,提供化学物质管控的技术、建立替代评估模型,在引导公众自愿前提下倡导企业在更广泛的产品和化学物质领域开展信息收集和公开制度。借鉴国外产品中化学品管理的丰富经验,在法律规定下由少到多分别列明管控的物质清单和产品清单,以替代评估为技术支持,引导公众自愿推进管理,为我国化学品管理决策提供有力支持。     

再制造产品的经济合理性评价

主要探讨再制造产品盈利能力的影响因素,开发一种方法用于评估各种再制造产品的经济合理性。从49例价格偏好的研究发现,在许多情况下,原始设备制造商(OEM)同时生产新产品和再制造产品将获得更大的整体利润。同时指出产品间和个人间的定价行为差异以及转换行为差异,基于合理假设,即在一定价格区间内,由新产品向再制造产品间的偏好转移是呈线性关系的,从而相对简化计算,便于分析在什么情况下OEM同时生产新产品和再制造产品是具有经济合理性的,将会导致什么样的相对价格、销售额和利润。     

基于语料库的大学生英语水平对自我修正影响的研究

研究拟探讨自我修正行为和英语学习者二语水平之间的关系.结果显示:学习者的二语水平对学习者自我修正行为有很大影响,高、低水平学习者在自我修正行为上的差异主要表现在自我修正的频率和类型上.     

用于环路校准的延迟锁相环设计

延迟锁相环能够产生精确的延时而被广泛使用。本文介绍了一种适用于直接调制发射机锁相电路环路校准的延迟锁相环。电路采用TSMC 0.18μm CMOS工艺实现,参考频率为26 MHz。在3.3 V电源电压下的仿真结果显示:延迟锁相环锁定时间为520ns,锁定相位为2π,同时输出8路相位差为45o间隔的时钟。     

大班额情境下小学低年级语文有效教学策略研究

大班额教学已成为当前中国基础教育的普遍现象,在大班额教学背景下,教师应从实际出发,照顾到不同层次的学生。小学低年级语文教学是为学生打好基础的关键时期,教师要重视该阶段的教学方法和策略的选择,为学生的后续学习打好基础。     

How pre-service teachers navigate trade-offs of food systems across time scales: a lens for exploring understandings of sustainability

In response to the increasing recognition of the need for sustainable food systems, research on students’ and educators’ knowledge of food systems and sustainability more broadly has grown but has generally focused on what people ‘fail’ to understand. Moving away from this deficit approach, the present study used semi-structured interviews to explore how 12 pre-service teachers (PSTs) in the US consider sustainability in terms of the trade-offs – or concurrent costs and benefits – associated with using different agricultural resources over short, medium, and long terms. Drawing upon the constructs of framing, metacognition, and complex causality, the study found that the majority of PSTs referred to indirect experiences of seeing or hearing about agricultural resources to demonstrate stable knowledge of short-term trade-offs and construct tentative knowledge about medium-term trade-offs. Few described long-term trade-offs. Most participants also acknowledged some gaps in their knowledge in discussing trade-offs across the different time scales. Findings suggest the importance of leveraging and building upon educators’ (and ultimately students’) prior experiences to build their understanding of complex trade-offs that underlie food systems. The study also illustrates the value of using the concept of trade-offs across time scales to explore people’s conceptions and understandings of sustainability.     

Teacher Perceptions of School Consultant Social Influence Strategies: Replication and Expansion

The goals were to (a) replicate the findings of previous research with regard to the Consultee/Teacher Version of the Interpersonal Power Inventory (IPI), and (b) advance the literature by examining IPI scores about a current consultation relationship. Sample 1 included 99 elementary school teachers (44.4% Hispanic) who completed the IPI. Results replicated Erchul et al. Sample 2 (N = 37; 45.9% Hispanic) represented a subset of Sample 1 who participated in a consultation project and completed the IPI about influence in their current consultation relationship. The results advance the literature by offering evidence for convergent and predictive validity of the IPI soft power bases. Teachers who reported being influenced by soft power strategies experienced greater change in their behaviors and their students’ behaviors than those who reported being not influenced by such strategies. Implications for research and practice in school consultation are discussed.     

电子文件的归档管理和有效利用

阐述了电子文件的管理应制定管理标准，明确归档内容，实行电子文件和纸质文件同步归档，提出电子文档利用应建立信息数据库、实现网络化管理。     

我国天文学期刊引文统计分析

简述了文献计量学和引文分析对图书情报工作的作用;阐明对我国天文学期刊引文统计分析的目的;提出一般引文统计的原则;介绍了这次引文统计所涉及的内容。其中包括:(1)文献老化的量度——中国天文学近6年文献的半衰期和D.Price指数值;(2)天文学期刊引文率按年代分布的特征;(3)引文按语种分布比例;(4)引文按不同时间段反映出天文系统科技人员利用文献资料的引用率,(5)引文按文献类型统计结果;(6)篇引率及与国外同类刊物的比较。最后引出了对天文学期刊引文统计结果分析的6点认识。