文物展柜密封性能检测方法研究

The ventilation rate of a museum showcase is an important indicator for evaluating its sealing performance. In order to evaluate the ventilation rate of a showcase accurately, objectively and scientifically, some details of the detection and evaluation methods were comprehensively studied on the basis of GB/T 36110—2018. The results show that in order to achieve a better fitting effect, the carbon dioxide concentration outside a showcase should be fixed—a fixed concentration between 300 X 10 and 600 X 10 (volume fraction) had little influence on the fitting results. The average ventilation rate of the showcase at each moment was obtained by the numerical calculation method. When the detection time was short, values were unstable and fluctuated greatly; after stabilization, they were close to the fitted ventilation rates. The initial carbon dioxide concentration had a great influence on the fitting results of ventilation rate. The initial concentration of carbon dioxide gas in a showcase should be basically fixed between 20 000 X 10" and 25 000 X 10 ~ (volume fraction) during detection, so that the testing results were comparable. The carbon dioxide mixture in the airtight showcase is relatively uniform, and no obvious dip occurred. The location of detection equipment has little influence on the fitting results of ventilation rate. If the fitted R reaches 0. 9, the results are considered valid, due to various errors in the detection process. © 2023, Sciences of Conservation and Archaeology. All Rights Reserved.     

一对青花云龙纹象耳瓶热释光年代测定报告

应用前剂量饱和指数法对两件青花云龙纹象耳瓶瓷器作了热释光年代测定,得到这两件瓷器的烧制年代均小于距今100年,否定了成份分析法得到的这两件瓷器系元代真品的错误结论。     

In-Plane Seismic Response Analyses of a Historical Brick Masonry Building Using Equivalent Frame and 3D FEM Modeling Approaches

ABSTRACT

This article aims at contributing to the seismic performance assessment of a historic brick masonry building by finding a strength reduction coefficient through the use of linear and nonlinear modeling approaches, using Finite Element Method and Equivalent Frame modeling. To reduce the uncertainties, ambient vibration tests (AVT) were implemented. Series of simulations was performed using nonlinear dynamic analyses and incremental dynamic analysis curves were compared with the pushover curves. Results indicate that the mass-proportional pushover curve meets the mean of results obtained from IDA and the strength reduction coefficient falls into the range given in EN 1998–1 for unreinforced masonry.     

九十年代我国人口地理学研究的瞻望

本文在分析我国人口形势的基础上,提出了九十年代结合我国人口实际情况开展人口地理研究的主要课题.同时对人口地理研究中理论与方法的提高也进行了讨论.     

基于ATP生物发光法的文物霉变检测与应用研究

为研究判定ATP(adenosine triphosphate,三磷酸腺苷)生物发光法在文物表面霉菌污染检测中应用可行性、科学性及适用性,利用ATP生物发光法对文物表面50种霉菌的生物发光值进行检测;构建了7种常见霉菌及其混合菌的菌落总数值与ATP生物发光值的线性关系函数,并在对应线性关系下分析了预测菌落总数值与实际值的差异;进一步利用ATP生物发光法评价模拟染霉试样在香茅醛熏蒸处理前后的霉菌数量变化。结果显示:50株待测霉菌中90%霉菌均检出了生物发光值(RLU)。在不同培养条件下,青霉、曲霉、木霉、毛壳菌、枝孢菌以及其混合菌的菌落总数对数值(lg^(CFU/mL))与生物发光对数值(lg^(RLU))之间均呈现了良好的线性关系,相关系数R^(2)>0.9817;在相应的线性关系下,预测的菌落总数值与实际平板计数的菌落总数值具有一致性(P<0.05),说明ATP生物发光法可以对文物表面霉菌进行准确相对定量。此外,香茅醛熏蒸处理组和对照组文物表面霉菌的生物发光值和菌落总数呈现了相同的差异变化趋势,说明ATP生物发光法可以直接用于熏蒸剂抑菌效力的评价。因此,ATP生物发光法在文物霉变检测中具有很高的适用性,同时在文物霉变程度分析及霉变文物消杀处理的效果评价等方面具有良好的应用价值,可为文物微生物病害的防控提供有效的技术支持。     

现代饭店有效培训系统的设计与运用

饭店的发展需要培训高素质的人才，而要获得理想的培训效果，则要设计一套科学有效的培训方法，它包括评价培训需求，创造良好环境，选择培训方法，与实践相结合以及评价培训结果等。     

基于氮气吸附法的古代丝织品纳米孔隙研究方法初探

孔隙不仅是纤维骨架的一部分，也是外界物质进出的重要通道。目前，关于古代丝织品纳米孔隙结构的相关研究极少，仅有孔径一项评价指标，较为单一。实验采用红外光谱法和电子顺磁共振波谱法研究古代丝织品的降解特征，在此基础上采用低温氮气吸附法表征蚕丝纤维内部固有的孔隙结构，首次从孔形、孔径分布、比表面积、孔体积、平均孔径、分形维数等多个角度对古代丝织品的微观孔隙结构进行综合研究。研究结果表明：与现代丝织品相比，清代黄山样品、北宋南陵样品及战国郴州样品的劣化程度依次加深。孔结构分析显示，所有样品中同时含有狭缝形孔和圆筒形孔，孔隙具有连续性，表明蚕丝内部存在复杂的多级结构。其中，劣化程度较高的北宋和战国样品内部存在更多的大孔或开放性孔隙。Barrett-Joyner-Halenda(BJH)法和非定域密度泛函(NLDFT)法的研究结果显示，样品孔隙以介孔为主，孔径主要分布在20 nm以下，最可几孔径基本稳定在2.8 nm左右，为蚕丝内部的有序孔。比表面积和孔体积的研究结果表明，劣化程度较轻的黄山样品具有较高的比表面积，其孔体积的增加主要来源于小孔，南陵样品和郴州样品孔体积的增加主要来源于大孔。分形维数的...