Enacting Experimental Alternative Spaces

This paper analyses the experimental nature of alternative spaces and the affective, emotional and embodied experience their enactment generates. In so doing, it grounds the analysis on the intentional community of Damanhur (Italy), as an example of experimental spaces. Scholarship concerning intentional communities draws on utopian studies that consider them as utopian laboratories. More recently, non‐representational approaches have emphasised the processual nature of utopias, yet studies have overlooked the experimental nature of these alternative spaces. Drawing upon in‐depth ethnographic data, this paper engages with community experimentations that took place in Damanhur for residents and visitors. It illustrates how utopian enactment is experimental and thus, disordering, unsettling and creative. Moreover, I argue that experimentations are not limited to unsettling the social structure of the community and, when studying the enactment of alternative spaces, emphasis should also be on their capacity to affect the individual.     

Bone Degradation and Environment: Understanding,Assessing and Conducting Archaeological Experiments Using Modern Animal Bones

Archaeological experiments that use modern bones to replicate past animal bone assemblages have often failed to consider the effects of environment, storage and preparation on modern bones. Often, these experiments make little mention of the conditions to which bones were subject during their storage and preparation for use in experiments. In other instances, these variables are reported but not considered as factors that contribute to the nature of the results obtained. This study considers previously reported data concerning the degradation of frozen bones (−20°C), and bones exposed to hot, dry conditions (40°C), and presents new data for bones exposed to room temperature environments (22°C) and refrigerated environments (2°C), and bones that are frozen (−20°C) and then thawed (22°C). These conditions are all relevant to understanding the nature of bone degradation and the use of bones in modern archaeological experimentation. This article also surveys a range of previously reported experiments that utilise modern bones to create analogies to the past and considers different methodological approaches and their relationship to the condition of bones at the time of their fracture and fragmentation. The longitudinal data presented in this study demonstrate differential rates of bone degradation over time in various environmental conditions. This degradation results in dramatic changes in bone fracture morphology, bone strength and utility for bone tool production. These observations have significant implications for experiments that utilise modern bones, especially when experimental data are used to create analogies to the archaeological past. Copyright © 2012 John Wiley & Sons, Ltd.     

Quantitative analysis of COH fluids synthesized at HP–HT conditions: an optimized methodology to measure volatiles in experimental capsules

The quantitative assessment of COH fluids is crucial in modeling geological processes. The composition of fluids, and in particular their H₂O/CO₂ ratio, can influence the melting temperatures, the location of hydration or carbonation reactions, and the solute transport capability in several rock systems. In the scientific literature, COH fluids speciation has been generally assumed on the basis of thermodynamic calculations using equations of state of simple H₂O–nonpolar gas systems (e.g., H₂O–CO₂–CH₄). Only few authors dealt with the experimental determination of high‐pressure COH fluid species at different conditions, using diverse experimental and analytical approaches (e.g., piston cylinder + capsule piercing + gas chromatography/mass spectrometry; cold seal + silica glass capsules + Raman). In this contribution, we present a new methodology for the synthesis and the analysis of COH fluids in experimental capsules, which allows the quantitative determination of volatiles in the fluid by means of a capsule‐piercing device connected to a quadrupole mass spectrometer. COH fluids are synthesized starting from oxalic acid dihydrate at P = amb and T = 250°C in single capsules heated in a furnace, and at P = 1 GPa and T = 800°C using a piston‐cylinder apparatus and the double‐capsule technique to control the redox conditions employing the rhenium–rhenium oxide oxygen buffer. A quantitative analysis of H₂O, CO₂, CH₄, CO, H₂, O₂, and N₂ along with associated statistical errors is obtained by linear regression of the m/z data of the sample and of standard gas mixtures of known composition. The estimated uncertainties are typically <1% for H₂O and CO₂, and <5% for CO. Our results suggest that the COH fluid speciation is preserved during and after quench, as the experimental data closely mimic the thermodynamic model both in terms of bulk composition and fluid speciation.     

西安鼓楼油饰彩画主要病害分析

为了对油饰彩画进行科学保护,对具有代表性的西安鼓楼油饰彩画病害进行了调查分析．发现存在的主要病害有失光、褪变色、粉化、龟裂、起甲、脱落、烟熏、降尘等。结合实验室模拟实验对病害成因进行了初步探讨,认为导致病变的内因是木基层含水率及地仗制作工艺;外界环境因素为紫外线、温湿度、大气降尘、油烟熏及降雨等。分析结果可为彩画保护提供科学依据。     

Evaluating civil development in counterinsurgency operations: the case for a field experiment in Afghanistan

It is a widely held belief that civil development programs play a central role in any counterinsurgency campaign. It is assumed that civil development assistance is key to ‘winning the hearts and minds’ of the civilian population, which, in turn, is crucial for victory. However, there is currently little evidence to support this belief. This article begins by analysing the different methods that have been used in Afghanistan in order to evaluate the effectiveness of civil development programs since 2001. It finds that these methods have severe limitations. Indeed, based solely upon current methods of evaluation, we have no reliable evidence whether civil development programs are actively improving security, having no impact or making matters worse. As such, this article makes the case for a field experiment approach to be adopted in Afghanistan. It argues that field experiments are the most powerful methodology currently available to social scientists for making causal inferences and, by making minor changes to the way in which civil development is distributed, we can vastly improve our understanding of the relationship between aid and security.     

中草药复方抑菌剂研究

本文旨在研究可用于文物保护的低毒、温和的新型中草药复方抑菌剂.选择大青叶和穿心莲两味中草药,通过L9（34）正交设计方法优化其提取工艺,并按中草药配伍规则配置成复方,通过对3种常见病原菌——金黄色葡萄球菌、枯草芽孢杆菌和大肠杆菌的抑菌试验来说明其抑菌活性.大青叶和穿心莲提取液复方制剂对于3种常见病原菌均表现出明显的抑菌活性,效果优于单味大青叶和穿心莲提取物.     

Experimental determination of CePO4 and YPO4 solubilities in H2O–NaF at 800°C and 1 GPa: implications for rare earth element transport in high‐grade metamorphic fluids

Monazite (CePO₄) and xenotime (YPO₄) are important accessory minerals in metasediments. They host significant rare earth elements (REE) and are useful for geochronology and geothermometry, so it is essential to understand their behavior during the metasomatic processes that attend high‐grade metamorphism. It has been proposed that F‐bearing fluids enhance solubility and mobility of REE and Y during high‐grade metamorphism. We assessed this possibility by determining the solubility of synthetic CePO₄ and YPO₄ crystals in H₂O–NaF fluids at 800°C and 1 GPa. Experiments used hydrothermal piston‐cylinder and weight‐loss methods. Compared to the low solubilities of CePO₄ and YPO₄ in pure H₂O (0.04 ± 0.04 and 0.25 ± 0.04 millimolal, respectively), our results indicate an enormous increase in the solubility of both phosphates with increasing NaF concentration in H₂O: CePO₄ solubility reaches 0.97 molal in 20 mol.% NaF, and YPO₄ shows an even stronger solubility enhancement to 0.45 molal in only 10 mol.% NaF. The greatest relative solubility increases occur at the lowest NaF concentration. The solubilities of CePO₄ and YPO₄ show similar quadratic dependence on NaF, consistent with possible dissolution reactions of: CePO₄ + 2NaF =  CeF₂⁺ + Na₂PO₄^? and YPO₄ + 2NaF = YF₂⁺ + Na₂PO₄^?. Solubilities of both REE phosphates are significantly greater in NaF than in NaCl at equivalent salt concentration. A fluid with 10 mol.% NaCl and multiply saturated with fluorite, CePO₄, and YPO₄ would contain 1.7 millimolal Ce and 3.3 millimolal Y, values that are respectively 2.1–2.4 times greater than in NaCl‐H₂O alone. The results indicate that Y, and by extension heavy rare earth elements (HREE), can be fractionated from LREE in fluorine‐bearing saline brines which may accompany granulite‐facies metamorphism. The new data support previous indications that REE/Y mobility at these conditions is enhanced by complexing with F in the aqueous phase.     

Solubility of corundum + kyanite in H2O at 700°C and 10 kbar: evidence for Al‐Si complexing at high pressure and temperature

The solubility of the assemblage corundum + kyanite in H₂O was determined at 700°C and 10 kbar, using a piston‐cylinder apparatus and rapid‐quench/fluid‐extraction techniques. Weighted mean concentrations of total Al and Si were 5.80 ± 0.03 mmol kg^?1 H₂O and 0.308 ± 0.003 mol kg^?1 H₂O, respectively (1σ errors). The Al concentration is nearly five times higher than that of corundum solubility in pure H₂O. This difference is interpreted to arise from complexing between Si and Al to form HAlSiO_4,aq species. Charged or more polymerized species are also possible, but their abundance cannot be constrained based on these experiments. Assumption of a single aqueous aluminosilicate complex permits calculation of the thermodynamic consequences of Al‐Si interaction in high‐pressure fluids, as well as phase diagrams for the system Al‐Si‐O‐H. Formation of Al‐Si complexes leads to a large increase in dissolved Al with increasing Si in solution, such that Al concentration in equilibrium with kyanite + quartz is predicted to be 7.1 mmolal, higher than with kyanite + corundum. The elevated concentration of Si in deep‐crustal and mantle aqueous fluids suggests that Al must readily be dissolved and transported by Al‐Si complexing in high‐pressure metamorphic and metasomatic environments. The results provide a simple explanation for the common observation of kyanite + quartz segregations in eclogites and Barrovian metamorphic rocks.     

A taphonomic study of bone modification and of tooth‐mark patterns on long limb bone portions by suids

This work presents new taphonomic data on bone modification by suids, including domestic pig, wild and hybrid boars. The intense modification undergone by bones from animals smaller than 100 kg is shown, together with a more moderate modification on bones from larger animals. Both the ravaging pattern (with preferential deletion of cancellous tissue) and the tooth‐marking frequencies are similar to those documented among hyenas and dogs when having primary access to complete bones. A dual‐patterned experimental model consisting of the interaction of humans and suids was also considered. Here it is shown how suid modification of hammerstone‐broken bone assemblages is different from that documented among canids and hyaenids, as experimentally replicated. These results increase the number of non‐anthropogenic bone‐modifying agents and posit new issues on equifinality processes. Copyright © 2008 John Wiley & Sons, Ltd.     

Hits and misses when throwing stones at mass analysis

Mass Analysis (MA), a well-recognized method of flake debris analysis, has generated significant interest in size-grade variables for investigating prehistoric lithic technologies, criticism of such usage, and combination methods developed to address some of those criticisms. A recent critique concluded that there are significant sources of error that preclude the use of MA for investigating prehistoric assemblages. We disagree with this generalization, but recognize that uncritical application of MA by non-lithic specialists is unlikely to yield useful results. Confusion as to what constitutes MA versus other size-grade approaches is a significant consideration. We address these issues as well as replicator variability, raw material, debitage mixing, diagnostic signatures, and the necessity of multivariate analysis in demonstrating that in many cases the attacks on MA are based on faulty evidence or are misguided. We advocate the use of a multiple lines of evidence approach that incorporates aspects of MA. Continued experimentation and application to particular archaeological assemblages in a cyclical fashion is necessary to explore more fully the utility of MA.