Climate change and coastal megacities: Adapting through mobility

Climate change poses threats to individuals, communities, and cities globally. Global conversations and scholarly debates have explored ways people adapt to the impacts of climate change including through migration and relocation. This study uses Lagos, Nigeria as a case study to examine the relationship between flooding events, migration intentions as a preferred adaptation, and the destination choices for affected residents. The study draws on a mixed-methods approach which involved a survey of 352 residents and semi-structured interviews with 21 residents. We use a capability approach to analyze mobility decisions following major or repetitive flood events. We found that the majority of affected residents are willing to migrate but the ability to do so is constrained by economic, social, and political factors leading to involuntary immobility. Furthermore, intra-city relocation is preferred to migration to other states in Nigeria or internationally. These findings challenge popular Global South-North migration narratives. Indeed, some residents welcome government-supported relocation plans but others remain skeptical due to lack of trust. Community-based relocation may therefore be preferred by some Lagosians. Overall, this study contributes a nuanced understanding of mobility intentions in response to climate-induced flooding in one of the world’s largest coastal cities.     

A novel analysis of consumption-based carbon footprints in China: Unpacking the effects of urban settlement and rural-to-urban migration

Urbanization in developing countries greatly contributes to growing carbon emissions. Although studies have documented the urbanization effect, the science of consumption-based footprint assessments has yet to unpack various effects during the process of urbanization. Based on household expenditure data, this study innovatively proposes a methodology to conceptually and statistically deconstruct the observed urbanization effects on carbon footprint into selection effects and migration effects, which consist of human settlement effects and purposeful changes of migration (such as income and residential location). Applying propensity score matching and regression on the 2010 China Family Panel Study, we find that the apparent carbon-footprint difference between rural residents and migrants is about 1.5 t CO₂e per capita. The migration effects account for about 2/3 of the apparent difference and the remaining 1/3 is due to selection effects. Urban settlement effects and the purposeful changes account for 73% and 27% of the migration effects, respectively. Transport sector is the key driver of carbon-footprint growth: it accounts for 60% of the migration effects. We conclude that travel behavior of rural migrants, currently in scarcity in the lite rature, merits further investigation, and policies should emphasize transit-oriented land use and transportation to achieve low-carbon urbanization.     

油气成藏系统──概念、分类和应用

介绍了油气成藏系统的有关概念、成因分类及其在勘探中的应用。油气成藏系统将油气藏形成的各种地质因素、过程及其历史作为一个有机联系的系统进行整体研究。成熟烃源岩的质量、数量和油气显示情况是油气成藏系统分析中的两个重要方面。在一个油气成藏系统中，三个关键因素是源岩充注能力、烃类运移方式和捕集方式，它们构成油气成藏系统成因分类的依据。油气成藏系统理论是油气远景评价工作十分有效的工具，已成功地应用于生产实践中。油气成藏系统理论已成为近年来石油地质学领域的热点之一。     

断层垂向封油气性综合定量评价方法探讨及应用

在断层垂向上封油气机理及影响因素分析的基础上,通过物理模拟建立了原油通过断裂带运移速度与断层填充物粒度、倾角和泥质含量之间的函数关系。根据断裂带粒度、泥质含量和倾角,基于求取油气通过断裂带运移速度的大小,建立了利用油气通过断裂带运移速度研究断层垂向封油气性的综合定量评价方法。将该方法分别应用于库车坳陷克拉2气田和车古20潜山主要断层垂向封气和油性评价中,评价结果与实际地质条件吻合较好,表明该方法用于评价断层对油气的垂向封闭性均是可行的,是一种综合定量的评价方法。     

‘There’s no future here’: The time and place of children’s migration aspirations in Peru

This article examines young Peruvians’ aspirations and the role of migration in their imagined futures, from a generational perspective. The data come from Young Lives, a long-term study of childhood poverty combining survey and qualitative approaches with children and their parents. The paper uses a biographical approach that sees migration as part of individual biographies as well as social structures and life course processes. The aim is to deepen understanding of the social contexts in which aspirations for and by children are generated, paying close attention to family migration histories, dynamic household contexts, and children’s migration networks. The analysis focuses on the time-spaces of migration aspirations, showing the way past, present and future are interconnected. It also emplaces aspirations by focusing on the way aspirations by and for children are constituted in and through particular places. The conclusion reflects on the role of poverty and argues that ‘aspirations’ are about much more than abstract ‘futures’; they orient actions in the present and say a great deal about young people’s current realities and relationships.     

横向各向同性介质拟声波方程及其在逆时偏移中的应用

地下岩石的速度各向异性影响地震波的传播与成像.横向各向同性(TI)介质为最普遍的等效各向异性模型.引入TI介质拟声波方程可以避免复杂的弹性波方程求解以及各向异性介质波场分离,以满足对纵波成像的实际需要.本文从垂直横向各向同性(VTI)介质弹性波方程出发,推导出正应力表达的拟声波方程以及相应的纵波分量的表达式,进而分析从频散关系得到的拟声波方程的物理意义,而后将拟声波方程扩展到更一般的倾斜横向各向同性(TTI)介质中.波前快照与群速度平面的对比验证了拟声波方程可以很好地近似描述qP波的运动学特征.在此基础上,将拟声波方程应用在逆时偏移中并与其特例声波近似方程进行对比,讨论了计算效率、稳定性等实际问题.数值试验表明VTI介质情况下采用声波近似方程可以提高计算效率,而TTI介质qP-qSV波方程则在效率相当的情况下可以保证稳定性.SEG/HESS模型和逆冲模型逆时偏移试验验证了本文TI介质拟声波方程的实用性.     

Speciation of Trace Elements in Acidic PoreWaters from Waste Rock Dumps by Ultrafiltration andIon Exchange Combined with ICPMS and ICPOES

A speciation procedure developed on reactive acidicpore water samples from mining areas is presented.Methods with low consumption of solution are requiredthat allow rapid sample preparation to avoid equilibriumchanges as far as possible. The entire procedure includesonly three parallel separation steps. One aliquot is filteredthrough an 1 kd ultrafiltration membrane to separate traceelements adsorbed or complexed by colloids. One cationand one anion exchange are performed with two additionalaliquots to determine simple hydrated ions and smallinorganic complex ions. Commonly used procedures ofion exchange seem to be problematic. This new techniqueis based on a novel ion exchanger. Subsequently the threefractions obtained from the separation procedures and theoriginal pore water sample are analysed by ICPMS, ICPOES,ET-AAS, Flame-AAS, FES and IC to determine the concentrationsof the major ions and additionally up to 50 trace elements. Theinfluence of pH-values and several dissolved compounds iscontrolled in experiment series with synthetically preparedsolutions to reveal potential artifacts.     

评述异常压力研究中的石油地质学新思想

在对异常压力的认识不断深化的过程中,凝结出许多新的概念和思想,为现代石油地质学理论注入了新的内容。关于超压生成与有机质成熟-生烃的关系虽有争议,但大多数主张超压对有机质成熟和生烃起抑制作用;在超压的背景下,生烃、排烃以及烃类的运移和聚集常呈现出幕式的特征;压力驱动是流体活动和油气运移的重要动力;动态运移通道是油气运移的新型通道;通常压力过渡带是油气聚集的有利场所;在超压的含油气盆地中,可能发现的非传统油气聚集有异常压力的气饱和封存箱、水力破裂-泥岩裂缝油气藏、烃水倒置的油气藏等。异常压力的储层具有相对独立性。     

Neoliberal reforms in elder care in Norway: Roles of the state, Norwegian employers, and Polish nurses

After a worldwide financial crisis in the early 1980s, many states decided to implement new public management strategies. These strategies consist of private sector management practices that aim to reduce the cost of public services. The US and the UK first adopted the new public management model and other states soon followed. The Norwegian state was initially reluctant to adopt private management practices, but it eventually implemented modified reforms that suited the Norwegian socio-political context. This article investigates the ways in which the Norwegian state and Norwegian employers shape the labor force in Norwegian nursing homes through new public management strategies, and the tools that foreign-born nurses use to challenge these structures. The Norwegian state shapes the labor force through labor market policies and the rescaling of public services to local governments, and Norwegian employers reinforce the neoliberal values of the state in their hiring practices and daily operations in the workplace. In particular, this article analyzes the interweaving neoliberal institutional and personal factors that influence the working experiences of Polish nurses in a semi-private nursing home in Oslo. The city of Oslo created a unique public–private partnership with a city-owned company that manages three nursing homes in Oslo. The findings of this study indicate that Polish nurses in one of these nursing homes were negatively affected by the new public management strategies. They improved some of their working conditions over time but structural barriers still persist despite high demand for their skills.     

Regulatory migration regimes and the production of space: The case of Nepalese workers in South Korea

This paper engages with contemporary debates in labour geography through its focus on: migrant workers as active agents of change; precarious employment, its complexities and consequences; and the importance of material spaces in migrant labour struggles. Since the early 2000s the South Korean government has been strengthening the institutionalised regulation of low-wage migrant workers. A key tool in this process is the Employment Permit System (EPS), in force since 2004. Under this policy migrant workers are temporary sojourners and effectively socio-politically, culturally and spatially excluded from Korean society. EPS restricts migrants’ freedom to choose or change workplaces, which renders them vulnerable to economic and social precarity. Employers use these restrictions to segregate migrant workers from co-nationals, and low-waged migrant workers often find themselves in exploitative working conditions in isolated places. This paper is based on deep ethnographic fieldwork in “Nepal Town” in Seoul and remote Nepalese workers’ accommodation. We examine how such precarious working conditions and isolation impact on workers’ active involvement in the formation and transformation of Nepal Town in Seoul. We examine the ways in which Nepal Town is a site of spatial agency and praxis for Nepalese workers and explore the potentialities of ‘reactive ethnicity’. The empirical insights provided, suggest that the regulatory migration regime for low-wage migrant workers is strongly linked with new formations of material landscapes of connection, mobility, freedom and safe space. Such space production enables migrant workers to perform agency and employ tactics of resistance in order to create spaces of possibility.