Nitrogen cycling in western India as revealed by nitrogen isotopes,and the historic production of saltpetre

Saltpetre (KNO₃) manufacture was a principal monopoly industry in early Modern India when the United Kingdom governed the social and economic systems. The process represented microbial transformation of excrementitious livestock and human wastes deposited around habitats, resulting in formation of salt efflorescence at an economic scale. Low caste people collected these wastes for extraction and production of rough saltpetre under the administrative control of British India. Stable isotope composition (δ¹⁵N and δ¹⁸O) was used to trace details of the microbial transformation processes, often involving the isotopic fractionation of nitrogen and oxygen. Marked elevation in δ¹⁵N and δ¹⁸O values for nitrates in soils and deposits, relative to those of primary organic nitrogen in diets and water sources, characterizes the unique processes of historic saltpetre manufacture in British India.     

Multi-element analysis for dietary reconstruction at a balearic Iron Age site

The number of studies using trace elements as indicators of diet has increased with time, but the majority have used few elements and a small sample. The present study has as a principal objective a multi-element analysis of diet in a large sample in which diagenetic changes have been shown to be unimportant. The analysis was made using concentrations of seven elements—Sr, Ba, Mg, Cu, Zn, V and Ca—in 197 individuals from the necropolis of ‘S' Illot des Porros’ (Majorca, Spain). The results show that these individuals would have had a mixed diet with a high meat component, principally of marine origin (molluscs and fish), but with an important consumption of seeds and cereals and a low proportion of vegetables.     

运用科学技术方法对清代珐琅的研究

作者运用原子发射光谱、扫描电子显微镜、偏光显微镜和金相显微镜,对故宫博物院藏清代珐琅残片进行了实验分析。研究中.对构成珐琅的硅酸盐材料、铜材料、焊接材料以及镀金层的元素组成进行了测试;对珐琅残片断面的焊接层和镀金层的微观形貌、焊接层的金相组织进行了观察和鉴别。在此基础上,运用结晶学、矿物学、金属学和金相学的基础理论对珐琅原料种类、各种原料的作用、珐琅料的熔制与烧蓝、铜材料与焊接材料的合金属性、焊层的金相组织、掐丝珐琅的烧制工艺等问题加以探讨,试图藉现代科技手段揭示清代珐琅所包含的科学技术内涵。     

国内外"低碳发展"研究进展及展望

随着工业化、城市化的深入发展,人类活动造成的能源安全与全球环境变化日益引起全球的广泛关注,以低消耗、低排放、低污染、高效益为特征"低碳"发展模式受到国际社会、政府、环境非政府组织(E-NGOs)等推崇,各界纷纷开展"低碳"的理论研究与实践探索.本文在简要概述"低碳"发展的时代背景的基础上,从理论研究与价值取向、宏观碳排放及驱动因素、低碳经济性与实现策略、微观碳排放与低碳生活方式、低碳城市发展与空间规划等5个方面对国内外的低碳研究进行回顾,并从理论与实践的关系、研究重点的差异、研究尺度的缺失、机制的探讨等方面进行评价,并展望未来的低碳研究-全面并力求反映现实的、面向未来与强调适应的、全球变化下不确定性的、追求品质与促进公平的低碳研究.     

西汉张安世墓葬M1墓室内的大气环境调查

了解待发掘封闭墓葬内的大气环境,可为考古发掘和文物保存环境研究提供科学依据。西汉张安世墓园中的M1墓葬是一座未被盗扰的墓室,本研究在墓室开启前,有针对性地监测了墓室内的微气候参数和大气污染物。结果显示,相对于外界大气,密闭的墓室内低温、高湿、缺氧,且酸性气态污染物浓度较低。因此,在考古发掘及后续保存文物时,应针对不同文物材料采取密闭容器、保湿、避光等措施,避免由于环境骤变导致文物的风化损坏。本研究建立的待发掘墓葬大气环境测试体系及基础数据,可为相关考古和文保工作提供有益的借鉴。     

大足北山石窟环境监测分析

本文对北山石窟区2002年环境大气中的SO2、NOx、TSP三项污染因子进行监测分析,指出北山石窟区空气质量属轻度污染,TSP是主要污染物。     

Carbon offsetting and renewable energy development

New carbon crediting and offsetting mechanisms are being developed under the Paris Agreement. Polluters can meet their emission reduction targets by acquiring and retiring carbon offset credits. Globally, most of these credits come from renewable energy sources. However, their additionality is increasingly questionable. Global renewable electricity capacity continues to grow. Greenhouse gas emissions from coal-fired power generation are starting to fall, as governments and organisations pledge to curtail emissions, more capital is mobilised for energy transition, and renewable energy technologies become commercially competitive. The opportunity to earn carbon offset credits is becoming less indispensable to renewable energy development. Aggregate emissions could rise above the baseline level when polluters increase their emission budgets by using carbon credits generated from a renewable energy installation that is part of the baseline scenario. To safeguard environmental integrity, the conditions for including renewable energy in carbon crediting and offsetting schemes should be reconsidered.     

The multivariate statistical analysis and XRD analysis of pottery at Xigongqiao site

A series of pottery samples excavated from the Xigongqiao site in Tengzhou city of Shandong province was determined using inductively coupled plasma atomic emission spectrometry. Together with excavation data and archaeological analysis, the potential for provenance and technology of unearthed ancient pottery was studied by using multivariate statistical analysis and X-ray powder diffraction pattern (XRD) analysis. In order to characterize and classify these earthenware samples, the major and minor/trace element concentrations were studied with both cluster analysis and principal component analysis. The results showed that there were three different groups in cluster analysis dendrogram in good correlation with their colors. This indicated that the potteries were made from clays of different composition. These results were in agreement with the results of principal component analysis. XRD analysis further assessed the validity of multivariate statistical analysis.     

旅游业碳排放强度分布及其驱动因子的时空异质研究——基于30个省(市、区)2005-2014年的面板数据分析

本文利用交通运输业、邮电业、商业、餐饮业、住宿业以及社会服务业这6个行业面板数据,在揭示2005年至2014年30个省(市、区)旅游业碳排放总量与强度的时空动态变化关系时,借助LMDI法分解出影响我国旅游业碳排放增加量的关键因素。研究结果表明:①旅游业碳排放总量在时间上呈逐年上升趋势,且中、西部地区增长速度要显著高于东部地区;②旅游业碳排放强度在时间上呈逐年递减趋势,且中、西部地区下降速度要显著低于东部地区;③影响我国旅游业碳排放增加量的关键因素取决于经济产出因子(TEO)、接待人次因子(TP)、行业结构因子(TIS)、能源效率因子(TEE)、能源结构因子(TES)5个方面,前两者为增量因子,后三者为减量因子。     

基于低碳目标的西部地区产业发展格局研究

产业发展格局一直是经济地理学的研究核心,一个区域产业结构的合理与否将直接影响到区域经济的发展。西部大开发战略实施以来,西部地区在产业发展取得巨大成就的同时,产业结构调整并没有取得实质性进展,东西部发展不平衡的主要问题已经从经济增长速度方面转变为产业结构层次的差距及由此引起的增长质量上的差距。可见,西部地区的产业发展结构还有待进一步完善;特别是在全球气候变化带来的节能减排压力下,西部地区需要重视当地生态环境状况,积极进行产业结构调整,构筑低碳型产业体系。本文在已有的研究基础上,分析我国西部地区产业发展现状以及其存在的问题,研究测算西部地区主要环境污染物排放趋势,进而探讨西部地区产业结构优化调整的方向,提出构建低碳型产业体系的政策和建议。