Consideration on the construction process and the sandstone quarries during the Angkor period based on the magnetic susceptibility

Detailed magnetic susceptibility measurement was conducted on the sandstones used for the Angkor monuments constructed in the period spanning the Preah Ko and Angkor Wat styles, and the construction process of the buildings and quarries of the sandstones was considered. Combined with the previous study on the sandstones of the Bayon style [Uchida, E., Cunin, O., Shimoda, I., Suda, C., Nakagawa, T., 2003. The construction process of the Angkor monuments elucidated by the magnetic susceptibility of sandstone, Archaeometry 45, 221–232], the magnetic susceptibility measurement revealed that there were 7 sandstone quarries corresponding to Stages I, II, III, IVa, V, VII and VIIIb during the Angkor period. The sandstones used for the monuments belonging to Stage I show average magnetic susceptibility values ranging from 1.1 to 2.3 × 10⁻³ SI units. In the Bakheng style period (Stage II), the average magnetic susceptibility of the supplied sandstones decreased gradually from around 10 to 1 × 10⁻³ SI units over time. The magnetic susceptibility range of the sandstones used for the monuments of Stage III was from 2.3 to 3.0 × 10⁻³ SI units. In the early Angkor Wat style period (IVb), the average magnetic susceptibility of the supplied sandstones increased over time, reflecting the supply of the sandstones from two different quarries, that is, the quarry corresponding to the Khleang and Baphuon style monuments (Stage IVa), with low average magnetic susceptibilities of 1.1 to 2.4 × 10⁻³ SI units, and the quarry corresponding to the main Angkor Wat style monuments (Stage V), with high average magnetic susceptibilities ranging from 2.8 to more than 4.3 × 10⁻³ SI units. The sandstones of Stage VII show low average magnetic susceptibility around 1 × 10⁻³ SI unit. The sandstones of Stage VId is a mixture of sandstones of Stages V and those of Stage VII. The sandstones with high magnetic susceptibilities are found in the monuments belonging to Stage VIIIb, reflecting the supply from the new sandstone quarry.     

Post‐conflict Heritage and Tourism in Cambodia: The Burden of Angkor

The World Heritage Site of Angkor is enduring one of the most crucial, turbulent periods in its 1200‐year history. Since the early 1990s over 20 countries have contributed millions of dollars to help safeguard and restore its temples. As one of Southeast Asia’s premier destinations, Angkor has also seen a 10,000% growth in international tourist arrivals in just over a decade. The challenges arising from the intense convergence of these two paradoxical and unstable agendas—heritage conservation and tourism development—are greatly compounded by Cambodia’s need to recover from war and turmoil. This paper explores the critical trends that have surfaced at Angkor and why the challenges posed by surging tourism have been inadequately addressed. It argues Angkor’s dominant role within Cambodia’s post‐conflict heritage and tourism industries requires closer, more critical attention given recent events in the country. This article is the summary of Winter's book Post‐conflict Heritage, Post‐colonial Tourism (Routledge 2007).     

Salt weathering of sandstone at the Angkor monuments,Cambodia: identification of the origins of salts using sulfur and strontium isotopes

The Angkor monuments in northwestern Cambodia, which are primarily made of sandstone, are suffering from deterioration due to salt weathering. In order to elucidate the sources of the salts and salt weathering process, this paper analyzed bulk chemical compositions and S (sulfur) and Sr (strontium) isotopic ratios for the salts and surrounding environmental materials. At places where bats inhabit the structures, various kinds of sulfate and phosphate salts are formed on the surface of the sandstone. The results of the analysis demonstrate that the S and P (phosphorus) components in the salts are primarily derived from bat guano. Moreover, Ca (calcium), which is the major element in the salts, is suggested to be derived from both bat guano and the sandstone. The isotopic data strongly suggests that bat guano is related to salt weathering. Removal of these animal excrements is essential for future conservation of these monuments. On the other hand, exfoliation of sandstone commonly occurs due to crystallization of calcite (CaCO₃) on platform surfaces of pyramid-type monuments. A large amount of Ca in calcite is suggested to be derived from calcite cement of the building sandstone.     

Nature and provenance of the sandstone used for Bayon style sculptures produced during the reign of Jayavarman VII

Under Jayavarman VII (1182/83-ca.1218 CE) the Khmer empire reached its apex, leaving a heritage of major construction works and unique artistic production. The stone materials of several sculptures produced under his reign were characterized and compared to possible geological sources in northern and eastern Cambodia. The data suggest that a specific type of sandstone, rich in volcanic detritus, was deliberately selected and quarried from a Triassic sedimentary sequence exposed far from Angkor, the main political and economic center at that time.     

Unearthing an Atlantean myth in Angkor: geoarchaeological investigation of the ‘underwater road’ crossing the Tonle Sap Lake,Cambodia

Of the many myths surrounding the medieval city of Angkor, Cambodia, one of the most obscure but pervasive is the existence of a road built across the Tonle Sap Lake. This road supposedly ran from the Angkorian ‘port’ at Phnom Krom to the temples situated in the Battambang district some 70 km southwest of capital. New geoarchaeological information demonstrates that the ‘road’ is actually a series of localised occurrences of authegenic calcite, which probably formed approximately 5500 years Before Present. Our results demystify this intractable Cambodian legend expand on the dynamic history of this important water body in mainland Southeast Asia.     

Peripheral creativity: temporary cultural uses as alternatives to inefficient policies?

ABSTRACT

The article focuses on temporary and improvised cultural spaces in marginalized neighbourhoods of Rio de Janeiro, Brazil. They are presented here as alternatives to current urban and cultural policies, often based on international ‘best practices’ models with exclusionary and segregating consequences. It begins with a brief overview into North American and Western European cultural planning policies. It then analyses the instability of cultural policies in Brazil, highlighting that, after a period of State recognition of bottom-up actions, administrators have turned to a contradictory planning scheme that mixes outdated and recent international trends, leading lower-income inhabitants to self-build their own cultural spaces. Unlike many products of today’s global strand of ‘tactic urbanism’, Rio’s temporary spaces are politically charged territories of resistance. An example is ‘Cine Taquara’ – an improvised cinema and debate forum that illustrates how, in an unequal city, such initiatives can do more towards social inclusion than ready-made models.     

Participatory action in the age of green urbanism. How Futurefarmers leapfrogged the culture consumer?

This article looks at a shift in urban governance and policy-making from a culture-led approach towards a ‘green turn’ and an environmentally informed approach. The particular focus of this exploration is how public art practices participate in this ongoing reconfiguration. We are especially concerned with the parallel effort by public administration and the art community to activate citizens through nature-oriented, public spaces. Our main target of interest is the city of Oslo where we investigate the art group that goes by the name of Futurefarmers, whose engagement with land development relates to planning, cultural strategies, curatorial approaches and related art projects. Our findings indicate that while this work pursues a mission of its own, it also has the potential to advance its position in public space by representing green values in decision-making processes. We argue that through this ability to operate both within and outside the system, art practice can introduce interdisciplinary collaborations that can drive change in cultural policy.     

日本城市规划中的公众参与

本文首先回顾、总结日本在20世纪50年代以后公众参与城市规划的发展历程以及社会环境、制度环境的变化,分析近年来公众参与城市规划的主要模式和特点,针对公众参与地区规划和城市总体规划这两种主要形式,深入分析、探讨组织框架、程序设计、制度建设等方面的特点和存在的问题。最后,阐述公众参与的开展对城市管理和城市规划体系的影响,总结日本公众参与城市规划的经验及其对中国的启示。     

柬埔寨吴哥石窟建筑结构形式及其破坏特征分析

柬埔寨吴哥石窟的文物建筑规模宏大．保存完整,蕴含极高的历史、艺术和科学价值,足著名的世界史化遗产,在世界建筑史上占有重要的地位。本研究从结构工程的角度,介绍了吴哥石窟建筑结构形式．并在现场勘察的基础上简述了吴哥石窟建筑破坏的类型,即结构破坏与材料破坏两种类型,在保护修复中,应针对不同的破坏肜式采取相应的技术措施。     

二十一世纪西方“比较城市研究”进展与述评

进入21世纪以来,伴随南半球城市快速发展,以及全球尺度的区域和城市间经济、社会、政治联系的加强,全球城市化景观持续重构,展现出多元发展特征,对传统城市理论的解释范式提出了新挑战。在此背景下,西方的比较城市研究开始复兴,尤其关注南半球城市经验,探索城市理论与研究范式的转型与建构,并成为城市研究的热点。为了把握国际城市研究前沿,本文通过详细解读相关文献并结合CiteSpace引文空间分析,全面梳理了21世纪西方比较城市研究的最新进展,评述和解析比较城市研究的概念、发展进程、研究方向和理论成果。希望以此拓展国际视野,为中国城市理论建设提供参考和借鉴。