ESR dating of the Donggutuo Palaeolithic site in the Nihewan Basin, northern China

The fluvio-lacustrine sequences in the Nihewan Basin, northern China, provide important terrestrial archives about Palaeolithic settlements and, therefore, about early human occupation in high northern latitude in East Asia. Here we present detailed ESR dating of the Donggutuo Palaeolithic site, located in this basin. Four levels A, B, C and E of the Donggutuo archaeological layer yield ESR ages ranging from 1060±129 ka to 1171±132 ka with a mean of 1119±132 ka. The ages are consistent with the paleomagnetic data, which show that the Donggutuo Palaeolithic site lies just below the onset of the Jaramillo normal subchron (0.99–1.07 Ma). Furthermore, our results indicate that the reliable ESR dating range of bleached quartz using Ti-Li centre can be effectively extended to 1100 ka and the Ti-Li centre was zeroed before the last deposition, which requires improvement of the understanding of the bleaching mechanism conditions.     

Relics of Empire Underground: The Making of Dark Heritage in Contemporary Japan

This paper examines civil activities to protect and conserve the underground war-related sites in contemporary Japan. Conservation movements rooted in local communities and centred on the Japanese Network to Protect War-Related Sites are making efforts to transform the dark heritage of war-related sites into cultural property in an attempt to integrate diverse wartime experiences. In delving into the heritage-making practices, I introduce local movements in Okinawa and Okayama. Okinawa hosts the first underground war-related site to become a cultural property, the Haebaru Army Hospital Bunkers, while Okayama struggles to create another one by making the Kamejima Mountain Underground Plant a dark heritage site. I argue that these conservation movements are challenging the homogenising national war memory by attaching ethnically diversified vernacular memories to the underground sites. In doing so, these underground war-related sites have become public spaces where new forms of social engagement are negotiated and contested.     

明清北京通州运河水系变化与码头迁移研究

明清时期,通州是大运河北端的漕运枢纽,漕运物资悉经通州码头转运至北京。由于通州一带土质松软,水道迁徙频繁,对漕运码头影响巨大。在自然水道自身变化和人力整治的叠加作用下,通州运河水系格局屡有变迁,位于通州附近的运河码头分布和功能也随着水系格局改变而迁移和调整。本文从分析明清时期通州运河水系格局变迁入手,梳理通州码头兴衰起伏和迁移分布过程,以阐述河道变迁与通州漕运码头之间的依存关系。通州码头变迁实际上是人与自然之间互相作用,互相影响的结果。     

Provenance research by INAA on ancient Chinese white porcelain excavated from the Maojiawan site of Beijing

More than one million shards of ancient Chinese porcelain were excavated at the Maojiawan pit in Beijing in September 2005. Among these shards, four types of ancient Chinese white porcelain were identified. The ages and provenances of three of these types of porcelain were accurately determined by archaeologists based on typology. However, different archaeologists interpreted the other/fourth type differently. According to the colour of the porcelain body, it was easily identified as the product of the Jingdezhen kilns of the Ming dynasty (1368–1644 AD). However, based on the vessel shape, this fourth type of porcelain was also identified as the product of the Cizhou kilns of the Yuan dynasty (1271–1368 AD). In order to determine the provenance of this type of ancient Chinese white porcelain, 131 shards comprising the four types of white porcelain identified at the site were selected as experimental specimens and analysed by Instrumental Neutron Activation Analysis (INAA). After the processing of experimental data by principal component analysis and geochemical analysis, the results show that the provenance of this type of ancient Chinese white porcelain is the Jingdezhen, not the Cizhou kiln.     

Characteristics of CO2‐driven cold‐water geyser,Crystal Geyser in Utah: experimental observation and mechanism analyses

Geologic carbon capture and storage (CCS) is an option for reducing CO₂ emissions, but leakage to the surface is a risk factor. Natural CO₂ reservoirs that erupt from abandoned oil and gas holes leak to the surface as spectacular cold geysers in the Colorado Plateau, United States. A better understanding of the mechanisms of CO₂‐driven cold‐water geysers will provide valuable insight about the potential modes of leakage from engineered CCS sites. A notable example of a CO₂‐driven cold‐water geyser is Crystal Geyser in central Utah. We investigated the fluid mechanics of this regularly erupting geyser by instrumenting its conduit with sensors and measuring pressure and temperature every 20 sec over a period of 17 days. Analyses of these measurements suggest that the timescale of a single‐eruption cycle is composed of four successive eruption types with two recharge periods ranging from 30 to 40 h. Current eruption patterns exhibit a bimodal distribution, but these patterns evolved during past 80 years. The field observation suggests that the geyser's eruptions are regular and predictable and reflect pressure and temperature changes resulting from Joule–Thomson cooling and endothermic CO₂ exsolution. The eruption interval between multiple small‐scale eruptions is a direct indicator of the subsequent large‐scale eruption.     

严复教育革新思想探析

中国传统教育向近代转型,经历了一个从理论到实践的过程。在理论转型中最核心的是严复资产阶级自由国民的近代教育目标的确立,围绕这一目标,从教育对象、教育原则到教育内容和方法,严复提出了一系列的适应近代社会发展的理论,形成了一个较为完整的近代教育体系,开启了中国教育近代化的大门。     

双墩文化的北上与北辛文化的形成——从济宁张山“北辛文化遗存”论起

山东济宁张山J1所谓"北辛文化遗存"实际属于双墩文化,双墩文化北向分布至泰沂山以南的鲁西南乃至鲁中南一带。北辛文化是北上的双墩文化和后李文化融合形成,北辛文化中所谓裴李岗文化因素主要间接承继自双墩文化。     

明代至清初贵州交通沿线的植被及石漠化分布的探讨

利用明清方志、游记、朱批奏折,以"移步换景"的视角,考察明代至清初贵州交通沿线的植被分布及变迁,并从石漠化地表景观、石漠化敏感性影响因子及与今日石漠化分布现状的对比等角度解读文献中所见的石漠化现象。结论认为,明末清初今贵州安顺、镇宁、六枝、盘县、普安等地已产生石漠化现象。     

重组乳酸乳球菌表达禽流感病毒HA1基因载体的构建及在禽流感病毒防治领域的应用

目的 构建以重组乳酸乳球菌为基础的黏膜输送载体.方法 以高致病性禽流感病毒H5N1的HA1基因作为研究对象,利用nisin诱导表达控制系统,构建分泌型与非分泌型重组乳酸乳球菌表达载体,经口服灌胃途径免疫BALB/c小鼠,通过ELISA检测小鼠血清IgG和粪便IgA,最后,对免疫后的小鼠进行H5N1病毒攻击实验,进而比较分泌型与非分泌型重组乳酸乳球菌表达载体的免疫效率.结果 分泌型重组乳酸乳球菌免疫小鼠后产生的抗体水平(IgG和IgA)高于非分泌型重组乳酸乳球菌,经过同型H5N1病毒攻击后,分泌型重组乳酸乳球菌免疫的小鼠的存活率为80%,而非分泌型重组乳酸乳球菌免疫的小鼠的存活率为60%.结论 本研究为防治高致病性禽流感病毒提供可行的思路与方法.