Conservation of cultural property. Specifications for temperature and relative humidity to limit climate-induced mechanical damage in organic hygroscopic materials

2015 ◽  
Keyword(s):  
Relative Humidity ◽  
Mechanical Damage ◽  
Cultural Property

Stacked Storage System for Large Works on Paper

2014 ◽  
Vol 35 (3-4) ◽  
Author(s):  
Nora Velensek ◽  
Fabienne Meyer ◽  
Eva Hummert ◽  
Irene Brückle
Keyword(s):  
Relative Humidity ◽  
Storage System ◽  
Mechanical Damage ◽  
Flat File ◽  
File Storage ◽  
Aspect Ratios ◽  
Corrugated Cardboard ◽  
Museum Study

AbstractAbout 1400 works on paper in the collection of the Kupferstichkabinett, Staatliche Museen zu Berlin were analysed for sheet dimensions and their aspect ratios and considered for storage- and handling-related damages. A new stacked enclosure system was developed for objects measuring up to 1350 × 950 mm to upgrade flat file storage, to reduce the risk of mechanical damage and improve the ease of handling in the museum study room and for exhibition preparation. Five defined standard dimensions for oversized artworks on paper and for enclosures and frames were introduced at the museum. They reflect the most common aspect ratios of 1:1.4 followed by 1:1.3. The new enclosure system consists of an outer shallow cardboard tray that holds up to five artworks enclosed in a folder. The folders are made either of cardboard, of a corrugated backboard and a cardboard cover, or of a corrugated backboard faced with museum board to which the object can be hinged; the latter serves as a mounting board for framing when the front cardboard cover is folded back. The trays are stackable. The corrugated cardboard walls of the tray retard the transfer of external relative humidity fluctuations into the stacked storage system.

Mechanical Damage Propagation in Polymer Electrolyte Membrane Fuel Cells due to Hygrothermal Fatigue

2014 ◽  
Author(s):  
Roshanak Banan ◽  
Aimy Bazylak ◽  
Jean W. Zu
Keyword(s):  
Fuel Cells ◽  
Relative Humidity ◽  
Polymer Electrolyte Membrane ◽  
Mechanical Damage ◽  
Element Model ◽  
Membrane Electrode Assembly ◽  
Pem Fuel Cells ◽  
Membrane Electrode ◽  
Special Focus ◽  
Damage Propagation

Temperature and relative humidity cycles play an important role in the initiation and propagation of mechanical damage in the PEM fuel cell membrane electrode assembly (MEA). However, there have been few studies on the mechanical damage evolution in PEM fuel cells due to humidity and temperature variations. In this study, we investigate the damage propagation in the MEA, with a special focus on the membrane/CL interface. A finite element model based on cohesive zone theory is developed to describe the effect of relative humidity (RH) amplitude on mechanical damage propagation in the MEA. Results showed that having larger RH variation in the applied cycles can result in up to 3.4 times higher fatigue stresses at the interface, and hence a considerably faster rate for delamination propagation.

scholarly journals Relative Humidity Influences Postharvest Browning in Rambutan (Nephelium lappaceum L.)

HortScience ◽  
1996 ◽  
Vol 31 (3) ◽  
pp. 417-418 ◽  
Author(s):  
M. Landrigan ◽  
S.C. Morris ◽  
K.S. Gibb
Keyword(s):  
Weight Loss ◽  
Relative Humidity ◽  
Enzyme Inhibitors ◽  
Mechanical Damage ◽  
Causative Factor ◽  
Salicylhydroxamic Acid ◽  
Nephelium Lappaceum

The effect of enzymic action, mechanical damage, and relative humidity (RH), on browning of stored rambutan was investigated. Mature rambutan fruit (`R 134') were infiltrated with known enzyme inhibitors, then either mechanically damaged or left undamaged, before storage at 20 °C with 95% or 65% RH. Fruit were visually scored for browning and weight loss was measured. All fruit at low RH browned severely. At high RH, infiltration with water, but not with the enzyme inhibitors, salicylhydroxamic acid and catalase, led to a large increase in browning. We infer that enzymes were involved in browning in damaged tissue under high RH. At low RH, inhibitors were ineffective as desiccation was the dominant causative factor of browning.

The Needs for Determining Degradation Risks from Temperature and Relative Humidity of Post-Byzantine Church Indoor Environment

2020 ◽  
Vol 11 (3) ◽  
pp. 601
Author(s):  
Laura SHUMKA ◽  
Leonidha PERI ◽  
Entela LATO
Keyword(s):  
Relative Humidity ◽  
Mechanical Damage ◽  
Assessment Method ◽  
Current Conservation ◽  
Climate Conditions ◽  
Cultural Objects ◽  
Risk Assessment Method ◽  
Byzantine Church ◽  
General Climate ◽  
Continental Climate

Monitoring and dealing with particular conditions related to relative humidity (RH) and temperature within different cultural objects including post-byzantine churches are of primary importance for the current conservation and advancement. The objective of this paper is to explore and discuss how standards can be implemented and guide the decision processes in order to facilitate a sustainable management of cultural buildings. Following the particularities of the interface of Mediterranean and continental climate conditions, here is introduced a general climate risk assessment method, which determines how indoor climates fit into the selected post-byzantine cultural objects in Albania. A relative humidity over 75% and temperature frequently over 30°C within several churches is been assessed as a high risk of sudden or cumulative mechanical damage to most artefacts and paintings because of high humidity. Predicting preservation is an important aspect in preventing damage to objects. This paper also describes the historical and scientific background to the current discussions.

scholarly journals Bean grain hysteresis with induced mechanical damage

2016 ◽  
Vol 20 (10) ◽  
pp. 930-935 ◽  
Author(s):  
Renata C. Campos ◽  
Paulo C. Corrêa ◽  
Lara S. Fernandes ◽  
Fernanda M. Baptestini ◽  
Cristian F. Costa ◽  
...  
Keyword(s):  
Experimental Data ◽  
Phaseolus Vulgaris ◽  
Relative Humidity ◽  
Control Sample ◽  
Mechanical Damage ◽  
Sorption Isotherms ◽  
Phaseolus Vulgaris L ◽  
The One ◽  
And Control ◽  
Control Samples

ABSTRACT This study aimed to evaluate the effect of mechanical damage on the hysteresis of beans with induced mechanical damage under different conditions of temperature and relative humidity. Beans (Phaseolus vulgaris L.) harvested manually with 35% water content (w.b.) were used. Part of this product was subjected to induced mechanical damage by Stein Breakage Tester and controlled drying (damaged and control sample), for sorption processes. The sorption isotherms of water were analyzed for different temperature conditions: 20, 30, 40 and 50 oC; and relative humidity: 0.3; 0.4; 0.5; 0.7 and 0.9 (decimal). Equilibrium moisture content data were correlated with six mathematical models, and the Modified Oswin model was the one that best fitted to the experimental data. According to the above mentioned isotherms, it was possible to observe the phenomenon of hysteresis of damaged and control samples, and this phenomenon was more pronounced in control ones.

scholarly journals Study of the conservation and exhibition of burned wall paintings in the main hall of the treasure house at Horyu-ji Temple

2020 ◽  
Vol 172 ◽  
pp. 15005
Author(s):  
Takuya Wada ◽  
Daisuke Ogura ◽  
Chie Sano ◽  
Shuichi Hokoi ◽  
Chiemi Iba
Keyword(s):  
Relative Humidity ◽  
Environmental Control ◽  
Cultural Property ◽  
World Heritage Site ◽  
Wall Paintings ◽  
Biological Damage ◽  
Heritage Site ◽  
Unesco World Heritage Site ◽  
Heat And Moisture ◽  
The Impact

Horyu-ji Temple is the main temple and Buddhist monument in the Horyu-ji area designated a UNESCO world heritage site since 1993. In 1949, the main hall in the Horyu-ji Temple, Nara prefecture, Japan, suffered a fire. Paintings on the burned walls are now stored with other cultural property in the treasure house which has no air conditioning, and doors and windows that are always closed. There is a fear of mold and pest generation due to high relative humidity in the room, so the environment must be controlled to protect the wall paintings from biological damage. Furthermore, Horyu-ji is considering an exhibition of the burned wall paintings in the treasure house, and we therefore need to consider the impact of visitors’ heat and moisture on the generation of mold and pests on the wall. I investigated environmental control methods using a blower in the attic space by numerical analysis. The analysis was performed in two case scenarios. One case involved preserving the walls in a closed treasure house and the other supposed an exhibition. As a result of this analysis, the effect of the reduction of relative humidity using a blower was clarified quantitatively.

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