Epistemological paradigms in the perception and assessment of vernacular architecture

The current situation of vernacular architecture is a result of the different perspectives of agents who have some sort of direct or indirect relationship with the architecture of the past which has influenced attitudes and ways of thinking, thus guaranteeing its assessment and survival. Therefore, this article reviews recent currents of thought and theories encapsulating the increased value of vernacular architecture. In the eighteenth century, this architecture made the romantic ideals of rural society synonymous with its surroundings, territory and country. In the twentieth century, a select few modernist intellectuals carried out in-depth studies of this architectural type in relation to its formal values. Now, in the twenty-first century, it has become the object of technological and scientific analysis for many experts. The current situation still presents many unresolved problems, which are perhaps the result of little thought having been put into specific aspects of the process of vernacular architecture.     

The two opposing impacts of heritage making on local communities: residents’ perceptions: a Portuguese case

This article examines the impact associated with the making of heritage and tourism at a destination. Special attention is paid to the residents’ perceptions of the impact. The examination is focused on the rural village of Sortelha, in Portugal, where, in recent decades, a state-led programme was implemented in order to renovate the historic buildings and built fabric and to generate benefits for the local community. Based on ethnographic materials collected in 2003, 2009 and 2013, the study demonstrates that the making of heritage may give rise to two opposing impacts simultaneously – increased social cohesion and place pride, on the one hand, and envy and competition (and, hence, social atomisation), on the other hand – and that residents are entirely cognisant of the tension between the two. The study has the potential to contribute to both the theoretical and the applied literature on heritage making.     

From verifiable authenticity to verisimilar interventions: Xintiandi,Fuxing SOHO,and the alternatives to built heritage conservation in Shanghai

ABSTRACT

The introduction of contemporary architecture into historic urban environments creates an open heritage discussion that includes the underlying relationship between development and conservation. This discussion requires theoretical clarification, as heritage conservation is frequently mistaken for other architectural design approaches that, even though they may operate within the historic environment as their primary source, do not comply with the complex definition of heritage authenticity used today. This article aimed to contribute to this debate, offering a characterization of such architectural design strategies operating through principles of verisimilitude that target authentication for tourists and the creative classes in a global city like Shanghai. Comparative studies of Xintiandi (Ben Woods, 2001) and Fuxing SOHO (Von Gerkan, Marg und Partner, 2015) provided an insight into the concepts of historic re-creation and abstract inheritance, currently used as ways of interpreting the historic residential typology of the Shanghai lilong according to the economic and political aims of the entrepreneurial model of governance. This allowed a critical evaluation of the growing attention paid to heritage in Shanghai in the last 25 years, and whether the substitution of the principle of authenticity for authentication has solved the contradictions between urban conservation and development in contemporary China.     

On the applicability of post-IR IRSL dating to Japanese loess

Recent work on infrared stimulated luminescence (IRSL) dating has focussed on finding and testing signals which show less or negligible fading. IRSL signals measured at elevated temperature following IR stimulation at 50°C (post-IR IRSL) have been shown to be much more stable than the low temperature IRSL signal and seem to have considerable potential for dating. For Early Pleistocene samples of both European and Chinese loess natural post-IR IRSL signals lying in the saturation region of the laboratory dose response curve have been observed; this suggests that there is no significant fading in nature. As a contribution to the further testing of post-IR IRSL dating, we have used 18 samples from two Japanese loess profiles for which quartz OSL and tephra ages up to 600 ka provide age control. After a preheat of 320°C (60 s), the polymineral fine grains (4–11 μm) were bleached with IR at 50°C (200 s) and the IRSL was subsequently measured at 290°C for 200 s. In general, the fading uncorrected post-IR IRSL ages agree with both the quartz OSL and the tephra ages. We conclude that the post-IR IRSL signal from these samples does not fade significantly and allows precise and accurate age determinations on these sediments.     

Attempts at thermoluminescence dating of fired materials from the Przeworsk Culture settlements

The thermoluminescence (TL) dating method has a significant measurement error margin reaching almost 10%. Due to this fact it could be considered as little effective in case of such sites from the Roman period as burial grounds with many artefacts useful for archaeological dating. However, for many settlements from this period, where pottery is the only kind of artefacts, the TL method can give notable results. The main purpose of the study was to make an attempt at TL dating of pottery and clay daub samples from the Nieszawa Kolonia and Kręcieszki sites and to compare the obtained dates with the results of archaeological dating of selected features from the Przeworsk Culture settlements. In the Kręcieszki site the fragments of burnt clay daub were dated by the TL method for the first time in the Lublin laboratory. It turned out that clay daub is an equally good dating material as pottery. It can be found that the TL dating of pottery from Nieszawa Kolonia confirms two stages of settlement. The first settlement stage is related to the phases B2-B2/C1-C1a of the Roman period, i.e. from the beginning of the 2^nd to the beginning of the 3^rd century. The second group of TL dates corresponds to the phases C2D that is to the second stage of settlement, from the second half of the 3^rd century to the half of the 5^th century AD. The results of TL dating of pottery and clay daub in the Kręcieszki site are rather similar and correspond to the phase B1/B2 of the period of Roman influence, determined from pottery style, but can also indicate the phase B2/C1.     

Preliminary results towards the equivalence of transformed continuous-wave Optically Stimulated Luminescence (CW-OSL) and linearly-modulated (LM-OSL) signals in quartz

The present paper presents a comparative experimental study of two commonly measured Optically Stimulated Luminescence (OSL) signals in quartz. The experimental study measures both the continuous wave OSL (CW-OSL) and the linearly modulated (LM-OSL) signals from the same quartz sample for a range of stimulation temperatures between 180 and 280°C, while the former is transformed to pseudo LM-OSL (ps LM-OSL). A computerized deconvolution curve analysis of the LM-OSL and ps LM-OSL signals was carried out, and the contributions of several OSL components to the initial OSL signal (0.1 s) were shown to be independent of the stimulation temperature used during the measurement. It was also found that the composite OSL (0.1 s) signal consists mainly of the first two OSL components present in the OSL curves. The equivalence of the ps LM-OSL (transformed CW-OSL) and of LM-OSL measurements was also examined by an appropriate choice of the experimental stimulation times, and of the stimulation power of the blue LEDs used during the measurement.     

Concordant <Superscript>210</Superscript>Pb and <Superscript>137</Superscript>Cs ages of black sea anoxic unconsolidated sediments

Two independent geochronologic radiometric methods: ¹³⁷Cs and ²¹⁰Pb were used to determine the sedimentation rate and subsequently to date the oldest sediments of a 50 cm core containing unconsolidated sediments collected at a depth of 600 m below sea surface in the anoxic zone of the Western Black Sea, off the Romanian town of Constanta. Both methods gave coincident value within experimental uncertainties of 0.42±0.20 mm·y⁻¹ for ¹³⁷Cs and 0.49±0.03 mm·y⁻¹ in the case of ²¹⁰Pb, within the Constant Initial Concentration model, which gave for the lower most sediments an age of 1.00±0.01 ka. The constant sedimentation model as well as the possible causes of observed discrepancy between experimental uncertainties are discussed.     

Dating mortar by optically stimulated luminescence: A feasibility study

Quartz is the datable component in mortar. Although its luminescence properties are very well studied, the problem of mortar dating arises from a low level of optical bleaching. In order to reduce the time consuming efforts for dating lime mortar in monuments by optically stimulated luminescence, we investigated the most suitable methods of dose and dose rate determination, and we explored tests which are suitable to predict the datability of a given material. Reverting to the large number of publications on sedimentary partially bleached quartz we found linear modulation techniques especially useful, equally we also recommend the determination of the level of optical depletion before starting analyses. Single grain analysis is regarded as an ultimate but infallible tool to date very poorly bleached quartz from mortar. Dose rate measurements need to take into account the radioactive equilibrium of the uranium decay and the short range inhomogeneity of the environmental gamma radiation field: gamma spectrometry and on-site TLD measurements are best suited.     

A sedimentation study of St. Ana Lake (Romania) applying the <Superscript>210</Superscript>Pb and <Superscript>137</Superscript>Cs dating methods

The biggest problem with most lakes that have no contact with other water sources and are being charged by precipitation is the massive eutrophication. The aim of this work was to determine the sedimentation rate in order to evaluate the progress of eutrophication for St. Ana Lake (Ciomad Mountain near the Băile Tuşnad in Harghita County (Romania)). The concentration of ²¹⁰Pb was determined by means of high resolution gamma spectrometry as well as derived from ²¹⁰Po activity which was measured through alpha spectrometry; values obtained are in good agreement. For the excess ²¹⁰Pb activity values between 4.0±0.5 Bq/kg and 218±20 Bq/kg have been found. As an alternative method, the ¹³⁷Cs dating method was applied as well. Calculated mass sedimentation rates are in the range of 0.06±0.01 to 0.32±0.05 g/cm² year with a mean of value of 0.15±0.02 g/cm² year. Linear sedimentation rates yielded much higher sedimentation values (between 0.5±0.1 and 7.9±0.7 cm/year with a mean of 2.4±0.6 cm/year), due to the predominant organic matter composition and the long suspension time of the sediment. This is an indication for the process of eutrophication which will probably lead to the transformation of the lake into a peat bog.