Can the Raman spectrum of anatase in artwork and archaeology be used for dating purposes? Identification by Raman microscopy of anatase in decorative coatings on Neolithic (Yangshao) pottery from Henan,China

Scanning electron microscopy/energy dispersive X-ray analysis has earlier shown that the white background layer (slip) on painted pottery sherds (Yangshao culture, Henan, China, 4200 BC) is composed of kaolinitic clay containing titanium in the assumed form of TiO₂ at just 1 wt%. The same samples of white slip have now been studied by Raman microscopy, revealing bands characteristic of anatase, but none from the majority species, the matrix of kaolinitic clay. These results highlight the extraordinarily intense Raman scattering from even trace amounts of anatase and thus the need to recognise that, although the colours of archaeological artefacts are almost always determined by the nature of the matrix, the Raman spectrum may be determined by a highly scattering trace component such as anatase. The significance of anatase as a potential date-marker pigment on works of art and archaeological artefacts is discussed.     

河南渑池县仰韶村遗址考古勘探报告

为配合仰韶村国家考古遗址公园建设,2019年3~5月,河南省文物考古研究院等单位对河南渑池仰韶村遗址进行了系统性考古勘探工作。遗址包含仰韶文化和龙山文化时期的聚落,主要遗迹有壕沟、房址等,基本搞清了遗址的范围,仰韶、龙山时期的聚落规模、面积、重要遗迹分布、聚落布局和功能分区等情况,对该遗址的聚落形态及发展演变等有了较全面的认识。     

Cool nothing: Dom Sylvester Houédard’s coexistentialist concrete poetics

ABSTRACT

This article concerns the concrete poetics of Dom Sylvester Houédard, which I define using a term from his 1963 article ‘Concrete Poetry & Ian Hamilton Finlay’, ‘coexistentialist’. Houédard's concrete poetry has sometimes been criticized for an anachronistic avant-garde quality, because of its non-semantic use of written language, and its associated air of intermedia experiment. But the term ‘coexistentialist’ has various connotations which allow us to interpret Houédard's work as highly responsive to its cultural moment, and to the unique theological tradition from which it emerged. These connotations include: the relationship between early and mid-twentieth-century modern art and literature; existentialist philosophy, especially the writing of Jean-Paul Sartre; Marshall McLuhan's theories on modern communication and ecumenical dialogue within the Catholic Church during the Second Vatican Council. After presenting an outline of Houédard's poetics related to these themes, I analyse some of his concrete poems or ‘typestracts’, produced between 1967 and 1972.     

湖北郧西张家坪遗址发掘简报

2009年11月到2010年1月,为配合南水北调工程,湖北省文物考古研究所对郧西张家坪遗址进行了发掘。遗址文化内涵较单纯,层位较清晰,主要以仰韶文化和东周文化遗存为主,少量唐宋的遗存,出土了丰富的陶器、石器、及少量的瓷器、铁器、铜钱等。该遗址的发掘,为研究汉水中上游同时期的区域文化以及南北文化的交流,提供了新的实物资料。     

甘肃礼县高寺头新石器时代遗址发掘报告

礼县高寺头遗址,位于礼县县城西南9公里处的石桥乡高寺村西南部的小山坡上,原称之为"礼县石桥镇遗址"。1986年,由甘肃省文物考古研究所组成考古队进行了发掘。同时,对该遗址的各台地进行了考古调查,发现在第二台地多为仰韶文化早、中期的遗存。第三、四级台地则多为仰韶文化晚期的遗存。故设置了上下两个发掘区进行了小规模的清理发掘,共清理出房址4座,灰坑8个,室内窖穴3个,出土陶器、石器、骨蚌器等遗物765件。均属于仰韶文化时期的遗存。     

陕西靖边五庄果墚遗址发掘简报

五庄果墚遗址位于陕西省靖边县黄蒿界乡小界村西北部,距离县城约30公里,现为省级文物保护单位。遗址中心位于五个连绵的山峁上,相传该处曾有五户人家居住,因而得名五庄果墚。五庄果墚遗址面积约30万平方米以上,文化内涵以仰韶时代晚期至龙山时代早期遗存为     

ENERGY-BASED TECHNIQUE FOR SEISMIC PERFORMANCE ASSESSMENT OF INTERIOR BEAM-COLUMN JOINTS

For investigating the seismic behaviour of monolithic beam-column joints, a new technique of assessment of joint performance, termed the Shear Deformation Energy Index, is presented in this paper. Previous research efforts in this field were evaluated and the relative merits and drawbacks of each approach were highlighted. Primary variables influencing the seismic behaviour of joints were studied in the experimental phase of the current study. This included pseudo-static testing of nine interior beam-column sub-assemblages with different joint configurations. The parametric investigation of primary variables was complemented by studying the behaviour of specimens of eight different experimental programmes. For easy application of the technique in design practice, the Index is graphically represented versus its main variables in a design chart, referred to as the Performance Chart.     

NONLINEAR ANALYSIS OF REINFORCED CONCRETE SHEAR WALL UNDER EARTHQUAKE LOADING

A constitutive model for predicting the cyclic response of reinforced concrete structures is proposed. The model adopts the concept of a smeared crack approach with orthogonal fixed cracks and assumes a plane stress condition. Predictions of the model are compared firstly with existing experimental data on shear walls which were tested under monotonic and cyclic loading. The same model is then used in the finite element analysis of a complete shear wall structure which was tested under a large number of cyclic load reversals due to earthquake loading at NUPEC's Tadotsu Engineering Laboratory. Two different finite element approaches were used, namely a two-dimensional and a three-dimensional representation of the test specimen. The ability of the concrete model to -reproduce the most important characteristics of the dynamic behaviour of this type of structural element was evaluated by comparison with available experimental data. The numerical results showed good correlation between the predicted and the actual response, global as well as local response being reasonable close to the experimental one.     

MODELLING OF RC MEMBERS UNDER CYCLIC BIAXIAL FLEXURE AND AXIAL FORCE

A model is proposed for the incremental force-deformation behaviour of reinforced concrete sections and members, under generalised load or deformation histories in 3D, including cyclic loading, up to ultimate deformation. At the section level the model is of the Bounding Surface type and accounts for the coupling between the two directions of bending and between them and the axial direction. For the construction of the member tangent flexibility matrix on the basis of the section tangent flexibility matrix, a piecewise-linear variation along the member is assumed for the nine terms of the tangent section flexibility matrix. Model parameters are derived on the basis of available test results for: (a) the force-deformation response under cyclic biaxial bending with normal force; (b) the hysteretic energy dissipation; (c) the secant-to-yield member stiffness, and (d) the ultimate deformation of the member under cyclic biaxial load paths.     

PREDICTION OF DAMAGE IN R/C SHEAR PANELS SUBJECTED TO REVERSED CYCLIC LOADING

In this paper, the damage prediction of shear-dominated reinforced concrete (RC) elements subjected to reversed cyclic shear is presented using an existing damage model. The damage model is primarily based on the monotonic energy dissipating capacity of structural elements before and after the application of reversed cyclic loading. Therefore, it could be universally applicable to different types of structural members, includeing shear-dominated RC members. The applicability of the damage model to shear-dominated RC members is assessed using the results from reversed cyclic shear load tests conducted earlier on eleven RC panels. First, the monotonic energy dissipating capacities of the panels before and after the application of reversed cyclic loading are estimated and employed in the damage model. Next, a detailed comparison between the analytically predicted damage and the observed damage from the experimental tests of the panels is performed throughout the loading history. Subsequently, the effects of two important parameters, the orientation and the percentage of reinforcement, on the damage of such shear-dominated panels are studied. The research results demonstrated that the analytically predicted damage is in reasonably good agreement with the observed damage throughout the entire loading history. Furthermore, the orientation and percentage of reinforcement is found to have considerable effect on the extent of damage.