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Estuaries have strong physicochemical gradients that lead to complex variability and often high rates of biogeochemical processes, and they are also often impacted by humans. Yet, our understanding of estuarine biogeochemistry remains skewed towards temperate latitudes. We examined seasonal and spatial variability in dissolved organic matter (DOM) and nutrients along a partly eutrophic, agricultural–urban estuary system in Southeast Asia: the Johor River and the East Johor Strait. Dissolved organic carbon (DOC) and coloured DOM (CDOM) showed non-conservative mixing, indicating significant DOM inputs along the estuary. The CDOM spectral slopes and CDOM : DOC ratios suggest that terrigenous, soil-derived DOM dominates along the Johor River, while phytoplankton production and microbial recycling are important DOM sources in the Johor Strait. CDOM properties were not unambiguous source indicators in the eutrophic Johor Strait, which is likely due to heterotrophic CDOM production. Nitrate concentrations showed conservative mixing, while nitrite concentrations peaked at intermediate salinities of 10–25. Ammonium concentrations decreased with salinity in the Johor River but increased up to 50 µmol L−1 in the Johor Strait, often dominating the dissolved inorganic nitrogen (DIN) pool. Phosphate concentrations were low (<0.5 µmol L−1) throughout the Johor River but increased in the Johor Strait, where DIN : phosphate ratios were typically ≥ 16 : 1. This suggests that the Johor Strait may experience phosphorus limitation and that internal recycling is likely important for maintaining high nutrient concentrations in the Johor Strait. Overall, our results indicate that the Johor River and Johor Strait are clearly not part of the same estuarine mixing continuum and that nutrient recycling processes must be quantified to understand nutrient dynamics in the Johor Strait. Moreover, our results highlight the need for better techniques for DOM source tracing in eutrophic estuaries.

Using data from the Mexican Migration Project, we evaluate the effects of documented and undocumented migration on the health of Mexican adults. Results suggest that documented and undocumented migrants are positively selected with respect to health in migrating to the United States and health status does not strongly predict selection into return migration back to Mexico. Among returned migrants, health deteriorates as the number of trips to the United States increases, with undocumented migrants experiencing an extra health penalty. While there is no continued decline on return to Mexico for undocumented migrants, they fare worse than returned documented migrants.

In this article, the authors present findings from a community action research partnership to investigate what obtaining a driver’s license would mean to undocumented immigrants in Central New Jersey.

This study extends Thaddeus and Maine’s (1994) “three delays” framework to model the interrelated barriers to maternal health care and birth registration. We focus on stateless persons and irregular migrants, populations that are especially at risk of being “left behind” in United Nations member states’ efforts to “provide legal identity to all” as part of the 2030 Sustainable Development Agenda. Drawing on qualitative fieldwork conducted in Sabah, Malaysia, we model delays in accessing maternal health care and birth registration as an integrated, cyclical process. We identify the political and legal barriers that stateless or migrant families confront while deciding to make institutional contact (Phase I), identifying and reaching health or registering institutions (Phase II), and receiving adequate and appropriate treatment (Phase III). We find that exclusion from one system raises the risk of exclusion from the other, resulting in a range of negative consequences, including increased health risks, governments’ impaired ability to monitor population health, and the perpetuation of intergenerational cycles of legal exclusion.

In May 2020, the United Nations Refugee Agency issued a statement emphasising the particular vulnerabilities faced by stateless populations during the global COVID-19 crisis. In stating that 'nobody can be protected unless everybody is included, and that means including often invisible, stateless populations', UN High Commissioner for Refugees Filippo Grandi highlighted two issues: 1) COVID-19 has not only exposed, but has moreover exacerbated existing inequalities, including those operating along the dimension of legal status; and 2) the protracted exclusion of stateless peoples may undermine governments' efforts to protect the health of their populations' recognised citizens. Grandi's comments echo recommendations from the World Health Organization and other international bodies that governments 'leave no one behind' in their responses to COVID-19. Yet, in many contexts, stateless persons and others who are legally marginalised have not adequately been factored into policies for managing COVID-19.

iWith the rapid economic development of China and the overall shift in the global political economy, there is the emergence of new Chinese on the move. These new Chinese migrants and diasporas are pioneers in the establishment of multiple homes in new geographical locations, the development of new (global and hybrid) Chinese identities, and the creation of new (political, economic and social) inspirations through their mobile lives. This book identifies and examines new forms and paths of Chinese migration since the 1980s. It provides updated trends of migration movements of the Chinese, including their emergent geographies. With chapters highlighting the diversities and complexities of these new waves of Chinese migration, this volume offers novel insights to enrich our understanding of Asian mobility in the late twentieth and early twenty-first centuries. The book will be of interest to academics examining migration, mobility, diaspora, Chinese identity, overseas Chinese studies and Asian diaspora studies.ii iii

Modern tsunami events have highlighted the vulnerability of port structures to these high-impact but infrequent occurrences. However, port planning rarely includes adaptation measures to address tsunami hazards. The 2011 Tohoku tsunami presented us with an opportunity to characterise the vulnerability of port industries to tsunami impacts. Here, we provide a spatial assessment and photographic interpretation of freely available data sources. Approximately 5000 port structures were assessed for damage and stored in a database. Using the newly developed damage database, tsunami damage is quantified statistically for the first time, through the development of damage fragility functions for eight common port industries. In contrast to tsunami damage fragility functions produced for buildings from an existing damage database, our fragility functions showed higher prediction accuracies (up to 75 % accuracy). Pre-tsunami earthquake damage was also assessed in this study and was found to influence overall damage assessment. The damage database and fragility functions for port industries can inform structural improvements and mitigation plans for ports against future events.

In situ analyses of lubricated sliding contacts were performed by interfacing an ultraviolet Raman spectrometer to a ball-on-flat tribotester. The sliding contact was simulated by rotating a sapphire window that is transparent to ultraviolet radiation against a stationary ball. Various loads were transmitted to the contact center through the ball. A branched perfluoropolyaklyl ether (Krytox 479) and two linear perfluoropolyalkyl ethers (Fomblin 491 and Fomblin 497) have been studied under various loads at a 10 cm/s sliding speed. Krytox and a Fomblin of lower viscosity, Fomblin 497, decomposed to amorphous carbon upon sliding on a chrome steel ball but no amorphous carbon was detected from Fomblin 491. The amount of amorphous carbon at the contact area during sliding was a balance of formation and removal rates. It is postulated that surface activity of the chrome steel ball was the main cause for the lubricant degradation. The lubricant degradation at the chrome steel/sapphire interface was found to slightly increase the kinetic coefficient of friction at the contact center. However, catastrophic scuffing was not observed.

This dissertation addresses a topic of concern within international development today, which is that 1 in 4 children under the age of 5 worldwide have not been registered at birth (UNICEF 2017). I identify the causes for why so many people are left out of civil registration systems and the consequences of such exclusion for individuals' lives and states' development aspirations.I conducted 18 months of ethnographic fieldwork in Malaysia, during which I provided paralegal assistance to migrants and other marginalized families who faced challenges in obtaining basic documents such as birth certificates, marriage certificates, and identity cards. I also conducted over 100 \"document inventories\" of households living on palm oil plantations, informal settlements, and urban areas, which is a method I developed to catalogue the evidence a family possesses to substantiate their identities. I supplement this fieldwork with a case study of Myanmar based on historical sources and qualitative interviews.My main argument challenges the assumption that under-registration is the result of a lack of state capacity. I draw attention to how the recording of vital events, more than being a routine bureaucratic task, has profound socio-legal implications—most importantly for the determination of citizenship. I demonstrate that who gets counted, and how, are inherently political choices, and that these choices are often made in ways that exclude migrants and racial minorities from the nation by depriving them of the means to prove their legal personhood.In highlighting the voices and experiences of the families I followed, I demonstrate how omission from civil registration has reverberant negative consequences for people's lives, including ineligibility to attend school, arrests and detentions, the denial of reproductive healthcare, and the intergenerational transmission of irregular legal status. At the state level, I show how bureaucratic procedures for maintaining civil registration systems have been influenced by racialized fears about the demographic threats posed by migrants, which have transformed attitudes about the counting of births from being administrative tools, to being declarations about the boundaries of national identity and belonging.

In May 2020, the United Nations Refugee Agency issued a statement emphasising the particular vulnerabilities faced by stateless populations during the global COVID-19 crisis. In stating that 'nobody can be protected unless everybody is included, and that means including often invisible, stateless populations', UN High Commissioner for Refugees Filippo Grandi highlighted two issues: 1) COVID-19 has not only exposed, but has moreover exacerbated existing inequalities, including those operating along the dimension of legal status; and 2) the protracted exclusion of stateless peoples may undermine governments' efforts to protect the health of their populations' recognised citizens. Grandi's comments echo recommendations from the World Health Organization and other international bodies that governments 'leave no one behind' in their responses to COVID-19. Yet, in many contexts, stateless persons and others who are legally marginalised have not adequately been factored into policies for managing COVID-19.