This article analyzes the indoor climate that creates risk of damages in naturally ventilated churches in the cold climate of Estonia. Indoor temperature and humidity were measured over a one-year period and the results were analyzed on the basis of damage functions: mold growth, risk of cracking and fracturing of wooden objects, and delamination of the gesso layer of panel paintings.
In unheated churches, one of the most dominant problems was very high relative humidity throughout the year, creating a high risk for mold and algae growth. Churches may need background heating to avoid freezing during a long cold winter that causes low surface temperatures of massive walls during the spring–summer period. It was found that mold risk was significantly lower in heated churches than in unheated or intermittently heated churches. The risk of mold growth was not decreased by the use of intermittent heating.
In heated churches, overheating (room temperature >+10ºC) causes a RH below 50% during cold periods, and the favorable period for irreversible response of panel paintings was significantly longer, so there is a higher risk that the gesso may crack or delaminate. From the point of view of the cracking and fracturing of wood, indoor climate conditions are in the safe range for most of the year. 相似文献
A matrix technique is used to determine levels of development of urban places within a system. This classification of places is based on two criteria: (1) the degree of development of the city's production complex; (2) its role in the geographical division of labor, based on the extent of its external relations (local, regional, national, foreign). The city's production complex is analyzed in terms of energy-and-production cycles, which are groups of technologically interrelated industries (as defined by N. N. Kolosovskiy). Points are assigned to individual production cycles within a city on the basis of the level of development of the particular cycle and the extent of its external relations. The points assigned to each cycle are then added up for a total number of points for the city. The urban places are then arranged in increasing order of points. Threshold values are determined to separate the set of places into levels of development, ranging from rudimentary producers of raw materials to fully integrated polyfunctional cities with wide-flung external relations. A condensed explanation of the technique appeared parenthetically in Soviet Geography, September 1969, pp. 375–377 相似文献
The problem of partitioning a territory can be formulated as the problem of constructing a hierarchy out of a set of subsets of a given system of objects. In terms of graph theory, a hierarchy may be defined as a connected directed graph that is both antisymmetric and nonreflexive. The hierarchy represents the result of the partitioning process. The actual process of partitioning can be treated as one in which information is gained about the system as a whole, but is also lost about individual objects as a result of aggregation. This enables us to apply the criteria of information theory to evaluate the quality of various partition schemes and to solve problems of functional and homogeneous regionalization. 相似文献