Consolidation and protection by nanolime: Recent advances for the conservation of the graffiti,Carceri dello Steri Palermo and of the 18th century lunettes,SS. Giuda e Simone Cloister,Corniola (Empoli)

Nanolime dispersed in 2-propanol was extensively used for the consolidation of wall paintings. The knowledge of the advances of this methodology dealing with all the possible effects associated with the nanolime new material in conservation is fundamental to assess and improve the technique. In this paper, four different dispersions of Ca(OH)₂ nanoparticles were characterised by Small Angle X-rays Scattering technique (SAXS) and Transmission Electron Microscopy (TEM) in order to achieve information on size, shape, polydispersity, agglomeration, and crystal structure (by SAED patterns) of the particles. Once characterised, the dispersions were tested in two different case studies, the Carceri dello Steri in Palermo with their graffiti and the 18th century lunettes at the SS. Giuda e Simone Cloister, Corniola (Empoli) with their lime-based mural paintings. The treated samples were characterised in relationship to either their morphology and surface chemical composition by Scanning Electron Microscopy coupled with Energy Dispersive X-rays spectroscopy (SEM-EDX), or their water absorption and mechanical properties (resistance to material abrasion). The results obtained showed that all the dispersions were nanometrically structured and their application succeeded in recovering the mechanical properties of the painting or graffito layers, not altering their permeability to water and keeping perfectly the wall transpiration. However, the dispersions constituted of the nanoparticles obtained via a synthesis able to control size and shape of the Ca(OH)₂ particles resulted in a better performance in situ, even if the differences found by SAXS and TEM were slight.     

解析现代儿童食品包装设计

对现代儿童食品包装设计理论及应用进行了描述与探讨.结合作者的设计作品--"每日果实"儿童糖果系列包装设计从设计制作方面讨论了现代儿童食品包装设计作品成为现实商品应用的可能性和实用价值.     

Identifying Holdings Unique to Your Library's Collections Using WorldCat

ABSTRACT

Having a good understanding of the variety and concentration of rare holdings in our libraries is becoming more and more important, not only for preservation and access purposes, but also for collection management and marketing. This article details how WorldCat's standard search interface can be used to identify holdings unique to particular institutions, or to compare the holdings of one or more institutions based on the relative rarity or ubiquity of the materials in their collections.     

谈高中思想政治课教材的重构——以“加强思想道德建设”为例

教材是基本的课程资源,新课改要求教师应合理"用教材",而不是"教教材"。教师可以根据预设的教学情境的需要,对高中思想政治课教材内容进行适度增删、调整和加工,通过教材的重构以更好地实现教学目标。教材体系重构应把握重点,体现整体性和逻辑性。教学情境创设应围绕重点,体现时代性和生活化。教学的德育目标应突出重点,体现无痕性和有效性。     

对沈阳体育学院教材建设问题的探析

为进一步做好我院的教材建设工作,使教材更好地为教学服务,本文通过调查访问法、座谈法等研究方法,对我院教材建设工作的现状进行调查研究。调查发现,目前我院老专业使用的部分教材出版年代早,内容落后于学科的发展,需要更新知识体系;新专业教材没有形成具有体育院校教材特色体系,只能使用全国高校通用的教材,教材内容与专业培养目标不完全符合;自编教材质量不高,需要采取有效措施,提高自编教材的质量等问题。     

天然气门站调压器冰堵故障分析

使用电伴热带缠绕调压单元及信号管加热,用保温材料包裹进行保温来解决调压器冰堵故障问题,调压器安装电伴热保温装置,用220V电压单独供电,电伴热线的功率为30瓦/米,每套电伴热保温装置需电伴热线20米,共360瓦电源。需对调压器信号管、调压单元及前后直管段加电伴热线缠绕同时包裹保温材料,保温材料选用无毒无味的聚氯乙烯(橡塑),每路调压器上电伴热保温装置由独立开关控制,电伴热保温装置的启用应根据环境温度和出站天然气的温度而定。     

试论对幼儿园教材的价值审视

随着幼儿园因本课程改革的不断深入，教材作为课程的体现物也日益重要。而目前，我国没有幼儿园教材编写的审定委员会，幼儿园教材的编写、发行随意性很大；也没有一个可供幼儿园一线教师选择或编写幼儿园教材的依据或评价指标。因此对幼儿园教材进行评价是很有必要的。评价教材的切入点即价值审视很重要，离不开现实社会特定的文化背景下的文化继承、社会政治经济发展对人的要求、教育理念与课程观和人的身心发展规律。     

高校土建专业建筑材料实验教学校企联合模式探索

为充分利用教学资源,深化教学改革,提高办学效益,通过对高校土建类专业建筑工程材料实验教学特点及建筑企业现状分析,提出建筑材料实验教学校企联合的新模式。阐述建筑材料实验教学校企联合的具体做法,并进行实效性分析。     

含单负材料的光子晶体的紧束缚模型

对含单负材料的光子晶体进行理论研究，发现可以用固体物理学中的紧束缚近似方法描述含单负材料的光子晶体能带的形成机制，说明由单负材料组成的光子晶体的能带可以看成是电磁波在两种材料界面共振隧穿形成的局域模迭加而成的。其通带可以看成是局域模展宽所得到的，局域模之间的交叠积分决定着通带宽度的大小．     

在线资料在英语听力教学中的应用

在英语听力教学当中,传统的听力教学模式应当与新兴的网络技术相结合,听力资料也应当相应地数字化,网络化,信息化,从而帮助教师实现课堂的课下延伸,保证听力资料的及时性。