Are rocks still water‐wet in the presence of dense CO2 or H2S?

The various modes of acid gas storage in aquifers, namely structural, residual, and local capillary trapping, are effective only if the rock remains water‐wet. This paper reports an evaluation, by means of the captive‐bubble method, of the water‐wet character in presence of dense acid gases (CO₂, H₂S) of typical rock‐forming minerals such as mica, quartz, calcite, and of a carbonate‐rich rock sampled from the caprock of a CO₂ storage reservoir in the South‐West of France. The method, which is improved from that previously implemented with similar systems by Chiquet et al. (Geofluids 2007; 7 : 112), allows the advancing and receding contact angles, as well as the adhesion behavior of the acid gas on the mineral substrate, to be evaluated over a large range of temperatures (up to 140°C), pressures (up to 150 bar), and brine salinities (up to NaCl saturation) representative of various geological storage conditions. The water‐receding (or gas‐advancing) angle that controls structural and local capillary trapping is observed to be not significantly altered in the presence of dense CO₂ or H₂S. In contrast, some alteration of the water‐advancing (or gas‐receding) angle involved in residual trapping is observed, along with acid gas adhesion, particularly on mica. A spectacular wettability reversal is even observed with mica and liquid H₂S. These results complement other recent observations on similar systems and present analogies with the wetting behavior of crude oil/brine/mineral systems, which has been thoroughly studied over the past decades. An insight is given into the interfacial forces that govern wettability in acid gas‐bearing aquifers, and the consequences for acid gas geological storage are discussed along with open questions for future work.     

MARRIAGE SQUEEZE IN CHINA'S FUTURE

The preference for sons in China and discrimination against girls have resulted in a male marriage squeeze. This paper develops two new indices of the sex ratio among potential first marriage partners by normalising first marriage frequencies and by eliminating the tempo effect in first marriage. Using two newly developed indices and two existing ones, the authors predict China's marriage squeeze for the period 2000–2100. The authors find that the new indices produce almost the same results as the existing ones when measuring the sex ratios of marriageable males to females. For the years 2015 to 2050, the sex ratio of potential males to females is over 1.15, and then fluctuates around 1.1 after 2060. From 2015 to 2045, China will face an annual surplus of one million males. However, if the high sex ratio at birth cannot be controlled, the male marriage squeeze will be much more severe.     

《宋太祖实录》探微

《宋太祖实录》前后经过四次编修,成书三部,至迟到元代时仍有传本存世。其纪事由于皇帝直接干预以及史臣避忌等原因,从而始终存在缺漏、原无后增以及与它史有异等问题,它直接促使私家通过著述欲辨明该段史事。     

60年代前期党对知识分子政策的反思和调整

60年代前期 ,党对知识分子政策进行了反思和调整 ,成为贯彻知识分子政策最自觉、最全面的时期之一。 1 958年秋冬至 1 960年党对知识分子政策的反思和重新认识 ,为 1 961年开始的知识分子政策调整准备了条件。 1 961年开始的调整主要从制定科研、教育、文艺的工作条例 ;为知识分子“脱帽加冕”及为被错误批判的知识分子甄别平反等方面进行。 60年代前期知识分子政策的调整 ,范围广 ,力度大 ,措施实 ,取得了良好的效果     

试论布什政府对华政策的调整

美国布什政府对华政策的调整是冷战结束期间美国对外战略调整的一个重要方面.布什当政的四年是美国政府对华政策调整的四年,这一调整过程大致经历了四个阶段.在调整中布什政府对华政策的演变呈现出六大特点一是过程前起后伏;二是目标为演变和遏制中国;三是出发点着眼于长期性和全面性;四是政策的矛盾性;五是突出了人权政策;六是表现出政治问题经济化和经济问题政治化.导致布什政府调整对华政策的直接原因是“六·四”风波,但是,冷战的结束及因此而造成的美国战略利益的转变,才是布什政府改变对华政策的根本动因.     

The Making of Tupaia’s Map: A Story of the Extent and Mastery of Polynesian Navigation,Competing Systems of Wayfinding on James Cook’s Endeavour,and the Invention of an Ingenious Cartographic System

Tupaia’s Map is one of the most famous and enigmatic artefacts to emerge from the early encounters between Europeans and Pacific Islanders. It was drawn by Tupaia, an arioi priest, chiefly advisor and master navigator from Ra‘iātea in the Leeward Society Islands in collaboration with various members of the crew of James Cook’s Endeavour, in two distinct moments of mapmaking and three draft stages between August 1769 and February 1770. To this day, the identity of many islands on the chart, and the logic of their arrangement have posed a riddle to researchers. Drawing in part on archival material hitherto overlooked, in this long essay we propose a new understanding of the chart’s cartographic logic, offer a detailed reconstruction of its genesis, and thus for the first time present a comprehensive reading of Tupaia’s Map. The chart not only underscores the extent and mastery of Polynesian navigation, it is also a remarkable feat of translation between two very different wayfinding systems and their respective representational models.     

‘Mucho malo for fascisti’: Languages and Transnational Soldiers in the Spanish Civil War

This article explores the linguistic experiences of transnational soldiers, using the Spanish Civil War as a case study. It argues that communication difficulties provoked by linguistic diversity within the Republican war effort and particularly within the International Brigades, caused the high command to move from a utopian, internationalist policy to a more pragmatic approach. The article evaluates the role played by language intermediaries in this evolving policy and in the wider Republican war effort. Finally, it argues that soldiers grassroots experiences of language contact forged new linguistic forms which underlined a strong sense of shared purpose and identity.     

异质文化初次接触的启示——詹姆斯·库克之死个案研究

传统上,库克之死被归咎于夏威夷人的\"野蛮\",然而该观点却不能解释相关的另一现象:为什么在死后相当长的时间中,库克仍被岛民当做神灵祭拜?从18世纪的夏威夷社会文化本身去解读这一问题,会带给我们更具说服力的解释。在库克与夏威夷人接触的时候,\"土著\"文化与西方文化的交流还相对平等,夏威夷文化并且还起到更主体化的作用,库克为首的殖民者是被纳入到夏威夷本地文化中理解的。库克的死,可以启发我们去进一步探究异质文化初次碰撞的方式和模式问题。