Pollution Monitoring for Sea Salt Aerosols and Other Anionic Species at Hagar Qim Temples,Malta: A Pilot Study

The damaging effects of sea salt aerosols on Globigerina Limestone are well known, and various professionals have studied and reported on the often complex underlying deterioration mechanisms. Following a preventive conservation project, undertaken to shelter and protect the UNESCO World Heritage Neolithic temple sites of Hagar Qim and Mnajdra, the Preventive Conservation Unit within the Diagnostic Science Laboratory at Heritage Malta embarked on a pilot study to identify whether sea salt aerosol deposition patterns within the site alter significantly post sheltering. The results from this short pilot study, by identifying the presence of salts using ion chromatography, have shown that there is a consistent pattern that when directly linked to the intrinsic shape of the temple interior as well as to the micro-environmental factors that are changing as a direct result to the sheltering, point to the trends of greater pollutant accumulation, particularly dust.     

Bao Shichen and Agrarian Reform in Early Nineteenth-Century China

Known primarily for his reformist proposals in the areas of military affairs, foreign policy, the salt monopoly, and the grain tribute system, the influential early nineteenth-century literatus Bao Shichen 包世臣 (1775–1855) also made throughout his life numerous suggestions regarding the improvement of agricultural practice and of rural life. Contrary to the arguments of his older contemporary Hong Liangji that the empire was facing an imminent demographic and provisioning crisis, Bao argued that there was ample possibility for increasing crop yields, and improving popular livelihoods, if a more rational approach was taken to cropping decisions, farm labor allocation, agricultural commercialization, and local-level social organization. Bao was fond of quantification, and, far more than Hong, employed statistical analysis (albeit crude) to bolster his arguments. Fundamentally committed to increasing the power and wealth of the imperial state in the face of threats both foreign and domestic, Bao was highly optimistic that this could be achieved simultaneously with fulfilling his other basic commitment, relieving what he saw as widespread popular immiseration.     

李鸿章与晚清两淮盐政改革

李鸿章是对晚清两淮盐政改革产生重大影响的关键性人物.在两江总督任上,他毅然选择大商人而放弃小商人,以捐输票本、循环转运和招商联保的方式确保税源;在湖广总督任内,出于地方利益的考虑,他又坚决维护原来力图加以改变的"川盐济楚"局面.由此可见,利益才是李鸿章施政决策的根本出发点.     

明代盐法之演变与盐商之变化

明代的盐法是从宋元时期的盐法继承而来的,在国家专卖制度下组织了灶户制度,随着明初钞法的破坏,以及社会经济的变化,明代的盐法经历了一系列深刻的变化,如允许余盐和正盐一样可以公开进入国家的专卖体系;明中叶以后又出现了纳银开中制度等。所有的这些变化并不仅仅是盐法自身的变化,它也引起了与明代盐法变化密切相关的商人的地位与命运的变化。     

南昌明宁靖王妃墓出土丝织品结晶盐的分析与去除

结晶盐是纺织品文物的污染因素之一,为探讨消除污染的方法,使用傅立叶变换红外光谱仪(FTIR)、X射线粉末衍射仪(XCRD)和能谱仪(EDS),对南昌明墓出土丝织品上的结晶盐成分进行分析测试。测试结果初步判断,结晶盐的主要成分为脂肪酸钙盐。结晶盐可以通过EDTA二钠的螯合作用去除。     

遗址博物馆内土遗址本体可溶盐和霉菌危害预防与治理的进展

在博物馆建筑的保护下,尽管避除了由于风蚀、雨淋、日晒等有害因素所导致的土遗址裂隙、崩塌等病害现象,但是可溶盐迁移及霉菌滋生导致的表层风化等一系列危害会造成土遗址本体破坏和信息损失 ,所以进行这方面的研究尤其重要且迫切。本文主要综述了可溶盐、霉菌的破坏作用、产生原因、影响因素、防治措施等,并探讨了遗址博物馆内土遗址防治可溶盐及霉菌危害的可行性保护研究方法。     

Density and isothermal compressibility of supercritical H2O–NaCl fluid: molecular dynamics study from 673 to 2000 K, 0.2 to 2 GPa,and 0 to 22 wt% NaCl concentrations

We report on molecular dynamics (MD) simulations for predicting the density and isothermal compressibility of an H₂O–NaCl fluid as a function of temperature (673–2000 K), pressure (0.2–2.0 GPa), and salt concentration (0.0–21.9 wt%). The atomistic behavior was analyzed via the hydration number of ions and number of ion pairs. Hydration numbers of Na⁺ and Cl^? increased with increasing pressure and decreasing temperature. Conversely, the fraction of Na–Cl ion pairs increased with decreasing pressure and increasing temperature. This hydration and association behavior is consistent with the low dielectric constant of H₂O under these conditions. The presence of polynuclear clusters of Na–Cl was confirmed at high temperatures, low pressures, and high salt concentrations. We propose a purely empirical equation of state (EoS) for H₂O–NaCl fluids under high temperatures and pressures that should be useful for estimating the fluid distribution in Earth's crust and upper mantle in relation to effects on earthquakes and volcanic eruptions.     

Soluble Salts Amplify the Effect of Small Heterogeneities in the Structure of Porous Building Materials During Drying

Salt crystallization is a major cause of degradation in old buildings. One of the issues that stills need clarification is regarding the influence of the salts on the capillary absorption and subsequent drying of porous building materials. This article presents an experimental study that included capillary absorption and evaporative drying tests on two types of material (lime mortar and ceramic brick) using pure water or saturated solutions of six salts (sodium chloride, sodium sulfate, sodium nitrate, sodium carbonate, potassium nitrate, or potassium carbonate). The results of capillary absorption agree only roughly with the linear relationship, predicted by theory, between sorptivity and the square root of the ratio between viscosity η and surface tension σ of the solution (σ/η)^1/2. This poor agreement is probably due to material heterogeneity. The drying dynamics was regular and showed little dispersion between specimens, but only for the uncontaminated materials. Indeed, the drying dynamics of the salt contaminated materials was often irregular or diverged among similar specimens, and the same happened with their salt decay patterns. The main conclusion is that soluble salts can amplify the effects on drying of the small structural heterogeneities that porous building materials normally depict.     

Specialized Salt Production During the Ancient Maya Classic Period at Two Paynes Creek Salt Works,Belize: Chan b’i and Atz’aam Na

Underwater excavations at the Classic period (a.d. 300–900) ancient Maya salt works of Chan b’i and Atz’aam Na in Paynes Creek National Park, Belize, reveal activity areas associated with a substantial salt industry for distribution to nearby southern Maya inland sites where this biological requirement was scarce. Wooden architecture and salt making artifacts are abundantly preserved in a peat bog composed of red mangrove. Excavations, screening, and analysis of recovered material at the submerged underwater sites reveal that the artifacts are overwhelmingly briquetage: pottery vessels used to evaporate salty water by heating over fires to make salt. The spatial distribution of briquetage in relation to the interior and exterior of buildings reveals that salt production was occurring indoors. The plethora of briquetage and the scarcity of domestic artifacts indicate that the sites were specialized salt works and not physically attached to households.     

文献校释与盐湖地理现象复原——《水经·涑水注》安邑盐池“(潭)[渾]而不流”个案考察

本文根据盐湖卤水的地球化学特征以及盐湖生态系统等盐湖知识和理论,结合古人对盐湖湖色和浑浊度相关记载,校正《水经·涑水注》安邑盐池文字当为"紫色澄渟,渾而不流"。该段文字反映了盐湖在特定时间段内盐度增高,而盐度变化引起盐湖生物链顶端的优势种群卤虫体内产生红色素,进而将卤水染成紫色或者深红色;同时,这些悬浮于高浓度卤水中的卤虫,极大地影响了湖水对光线的吸收和散射,带来湖水浑浊的盐湖地理现象。郦道元提取了盐湖湖表卤水湖色和浑浊度的感官性状指标,强调其在盐天然结晶前的指标作用,是传统时代汉文文献中记载结晶前高盐度卤水中湖色和浑浊度变化精度最高的文本。