Fiber-based structured light including cylindrical vector beams (CVBs) and orbital angular momentum (OAM) has gained significant interest for its unique properties. In this work, we propose the concept of a programmable linearly polarized (LP)-mode synthesizer for general structured light generation, in which an LP-mode pool supporting independent and selectable LP-mode output is first established, and then different CVB/OAM modes could be generated in a general way through polarization and phase control. We demonstrate a proof-of-concept LP-mode synthesizer based on a fiber ring laser characterized by a partial five-LP mode weakly coupled few-mode fiber (FMF) cavity and an arbitrary LP-mode switch array. Various CVB/OAM beams including TE01, TM01, OAM±1 and OAM±2 modes are successfully generated. This approach provides new insights into mode manipulation methods, potentially enhancing the performance of optical quantum communications, optical fiber sensing and optical trapping applications.

This article surveys the recent literature on the politics of memory. It sets out the nature of research in this area over the last 25 years and distils its main trends and areas of focus. Investigating monographs and edited volumes published since the year 2000, it gives an overview of a rich and evolving area of study. It demonstrates the extent to which the increasing politicization and securitization of memory has started to underpin new strategies for political conflict with different groups on different levels using collective memory to assert identities. While the boundaries between the national and the transnational in studying the politics of memory are often blurred, the article broadly distinguishes between studying political conflict within and between states.

This paper draws upon the theoretical literature on migration policy and health, and empirical data on three European states with differing welfare models – Sweden (social democrat), France (conservative), and the United Kingdom (liberal) – during Covid-19, to highlight the often hidden and contradictory politics through which refugees, asylum seekers, and undocumented migrants were forced to navigate during the most uncertain period of the pandemic. Although migrants’ treatment during Covid-19 was generally better in Sweden with a social democrat welfare tradition, we see migration management priorities greatly undermining the extent to which welfare systems function overall for the benefit of population health. Furthermore, Sweden’s recent political shift to the right exacerbates those negative tendencies. As the paper shows, there was considerable effort by civil society and local government to fill the gap where national governments failed to protect this group, stepping in to provide health information, and support.

Many archaeologists recognize a need for a more proactive archaeology, one that is responsive to the goals of communities and so one that carries the potential to advance restorative justice and reclamation. But this work requires shifts in time and resources. Such high-investment community archaeology comes with unfolding developments, or cascade effects. We frame positive ones as including finding, honoring, elevating, and protecting cultural heritage and suggest these may offer those grappling with accommodating such shifts practical examples of the benefits. Our example comes from the Great Bay Archaeological Survey (GBAS) focused on colonial New Hampshire’s Great Bay Estuary/P8bagok (ca. AD 1600–1780). With years of community engagement in place, a landowner had heard of GBAS and stopped development when he noticed large stones. Here, we found an early colonial homestead site, the Meserve Garrison, and our attendant research traced out a trajectory of colonial expansion from Indigenous homelands transformed into English property, property into intergenerational wealth. With rising wealth came the dispossession of labor; GBAS found enslaved (freed) Africans lived in this rural northern New England frontier, a place not typically associated with chattel slavery. We are working to protect the site and publicly commemorate and restore an accurate, inclusive, colonial history.

Climate change and other anthropogenic stressors are reshaping Earth’s biodiversity, motivating efforts to monitor changing faunal diversity. Canada is home to 80 documented species of mosquitoes, 38 of which are reported in New Brunswick. Using Centers for Disease Control and Prevention miniature CO2 light traps, three adult mosquito collection surveys were performed to encompass 43 trapping sites across New Brunswick, Canada. Study one took place from 21 July 2022 to 9 September 2022, study two took place from 29 May 2023 to 24 October 2023, and study three took place from 15 May 2024 to 19 September 2024. Among the specimens collected, a total of 18 Uranotaenia sapphirina (Osten Sacken) (Diptera: Culicidae) were identified from five separate trapping sites. This species, previously documented only in Ontario, Quebec, and Manitoba, is considered rare in Canada and is known for its specialisation in feeding on annelids rather than vertebrates. Our detection of Ur. sapphirina in New Brunswick, where it has been absent in earlier surveys, suggests a recent range expansion, possibly driven by climate change. This observation highlights the need for ongoing surveillance to monitor the impacts of environmental changes on mosquito distribution.

We define the chain Sobolev space on a possibly non-complete metric measure space in terms of chain upper gradients. In this context, ɛ-chains are finite collections of points with distance at most ɛ between consecutive points. They play the role of discrete curves. Chain upper gradients are defined accordingly and the chain Sobolev space is defined by letting the size parameter ɛ going to zero. In the complete setting, we prove that the chain Sobolev space is equal to the classical notions of Sobolev spaces in terms of relaxation of upper gradients or of the local Lipschitz constant of Lipschitz functions. The proof of this fact is inspired by a recent technique developed by Eriksson-Bique in Eriksson-Bique (2023 Calc. Var. Partial Differential Equations 62 23). In the possible non-complete setting, we prove that the chain Sobolev space is equal to the one defined via relaxation of the local Lipschitz constant of Lipschitz functions, while in general they are different from the one defined via upper gradients along curves. We apply the theory developed in the paper to prove equivalent formulations of the Poincaré inequality in terms of pointwise estimates involving ɛ-upper gradients, lower bounds on modulus of chains connecting points and size of separating sets measured with the Minkowski content in the non-complete setting. Along the way, we discuss the notion of weak ɛ-upper gradients and asymmetric notions of integral along chains.

Foundation models – models trained on broad data that can be adapted to a wide range of downstream tasks – can pose significant risks, ranging from intimate image abuse, cyberattacks, to bioterrorism. To reduce these risks, policymakers are starting to impose obligations on the developers of these models. However, downstream developers – actors who fine-tune or otherwise modify foundational models – can create or amplify risks by improving a model’s capabilities or compromising its safety features. This can make rules on upstream developers ineffective. One way to address this issue could be to impose direct obligations on downstream developers. However, since downstream developers are numerous, diverse, and rapidly growing in number, such direct regulation may be both practically challenging and stifling to innovation. A different approach would be to require upstream developers to mitigate downstream modification risks (e.g., by restricting what modifications can be made). Another approach would be to use alternative policy tools (e.g., clarifying how existing tort law applies to downstream developers or issuing voluntary guidance to help mitigate downstream modification risks). We expect that regulation on upstream developers to mitigate downstream modification risks will be necessary. Although further work is needed, regulation of downstream developers may also be warranted where they retain the ability to increase risk to an unacceptable level.

At the London Tech Week event in early June, Nvidia CEO Jensen Huang praised the UK as the ‘envy of the world’ when it comes to AI researchers, but he also criticised it as the largest AI ecosystem in the world without its own infrastructure. The criticism is somewhat self-serving: when the UK does get around to building out that infrastructure, it’s certain to consist largely of chips sold by Huang’s company. It’s also unsurprising: Huang has been pitching the idea of ‘sovereign AI’ since at least 2023, conscious that nation states are the next deep pockets to target after the hyperscalers and generously funded model builders. In a world where the only real contenders in the race for AI supremacy are the US and China, we look at how the pursuit of AI sovereignty is playing out across the rest of the planet.

Pseudosection modelling of a relict garnet-core in Palaeoproterozoic rocks from the Gridino area in the southern Belomorian belt of Karelia reveals peak-pressure eclogite-facies conditions of 610–650°C, 18–20 kbar for two retro-eclogite samples and 610–665°C, 23–26 kbar for a rare Mg-rich biotite-orthopyroxene eclogite, suggesting low initial metamorphic field gradients of 6.6–10°C/km. This confirms an earlier finding in Karelia and, considering other Palaeoproterozoic eclogite occurrences worldwide, that ‘cold’ subduction conditions, characteristic of modern-style subduction, occurred during the Palaeoproterozoic, ∼2 Ga ago, for the first time in Earth history. However, compositions of most other phases in the retro-eclogite were reset by diffusion, deformation and recrystallisation during subsequent pressure release and heating to variable degrees, a reason for earlier overestimations of temperatures. By contrast, peak-pressure conditions for a biotite paragneiss (640–740°C, 15–18 kbar) that occurs close to the biotite-orthopyroxene eclogite locality already show an early resetting of its initial assemblage. High-pressure granulite-facies peak-temperature conditions of the retro-eclogite at 712± 5°C, 9–12 kbar (along a field gradient of 20°C/km) were determined by Zr-in-rutile thermometry and quartz-in-garnet elastic barometry. These conditions were dated by a Rb/Sr mineral isochron for the biotite-orthopyroxene eclogite at 1830±20 Ma for the first time. Using existing ages for the peak-pressure conditions, possible slow overall exhumation rates of <0.9 mm/y between eclogite and the granulite-facies stages could be determined that are compatible with erosion as the main exhumation mechanism. The peak-temperature conditions were possibly established by thermal relaxation during early exhumation. However, a younger Rb/Sr mineral isochron for the biotite paragneiss indicates a characteristic Sr-isotopic disequilibrium distribution caused by diffusion during slow cooling between ∼1800 and 1750 Ma during later exhumation.

In vitro systems involving microbial fermentation typically require freshly obtained inocula, such as rumen fluid or faeces. The objective of this study was to test whether preserved faeces can be used instead of fresh faeces in the Hohenheim gas test (HGT). Fresh faeces from sheep (control, C) was compared with seven differently preserved faeces by using nine different feeds and studying in vitro gas production (GP) (n = 6–9 per treatment). Preservation involved freezing at −20°C (FR), shock-freezing with liquid nitrogen (N) and additional freezing at −20°C (FRN), FRN followed by defrosting (FRNdef), shock-freezing with liquid N and freeze-drying (FDN), freeze-drying (FD) and freeze-drying with storage for 3 weeks (FD3W) or 6 months (FD6M). Metaproteomics was used to analyse microbiome composition and function in treatments C, FR, FRN, FD, and FDN (n = 3 per treatment). On average across all feeds, the potential GP with FR and FRN (61 mL/200 mg DM) was comparable to that of C (62 mL/200 mg DM), whereas values for FRNdef, FDN, FD, FD3W, and FD6M were 85, 78, 76, 78 and 71% of C, respectively. All estimated GP kinetic parameters were affected by feed and preservation interactions (P<0.001). Microbiomes from C, FR, and FRN differed from those of FD and FDN based on the relative abundance of the core proteins (P<0.001). FD and FDN showed a significant decline of Bacteroidota, functional redundancy values, and specific proteins such as carbohydrate esterases (CE) (P<0.05) and glycoside hydrolases (GH) (P<0.01). Overall, frozen faeces closely resembled fresh faeces and can serve as a viable alternative inoculum source in the HGT. This may reduce animal numbers used for scientific purposes, but preservation and storage must be strictly standardised to maintain an active microbiome for GP-based in vitro tests.

This paper investigates time-varying risk sharing between annuity buyer and provider. It explores Pareto optimal (PO) and viable Pareto optimal (VPO) risk-sharing designs, in which the share of the reserve deviation transferred to the policyholder varies over time. The optimization problem, based on a weighted average of mean-variance preferences, results in a complex quartic objective function. Such optimization problems are difficult to solve, and checking their convexity is known to be NP-hard. A heuristic method is introduced to simplify the problem, providing a closed-form solution that closely approximates the numerical results. The paper also highlights factors influencing the existence of VPO designs, with age playing a critical role, thereby suggesting the suitability of these designs as retirement products.

Translation is key to the political economy of neorural revival in contemporary Italy. Drawing on fieldwork with neorural farmers, I show how translations across semiotic domains and displays of linguistic and pragmatic untranslatability simultaneously produce capitalist value and temporary disruptions of the subsumption of life under capital. To understand this apparent paradox, I analyze the complex relationship between contemporary neorural revivalists and mid-twentieth-century neodialect poets. Driven by a reaction against the post-war encompassment of regional linguistic varieties within a national standard, the metapragmatics of untranslatability developed by the neodialect literary movement has indirectly provided contemporary neoruralists with semiotic resources to conjure profitable forms of agrolinguistic incommensurability. However, unlike the poets’ nostalgic and anticapitalist sabotage of the collusion between centripetal linguistic standardization and intensive agribusiness scalability, the farmers’ interactional disruptions of pragmatic regimentation and seamless intertranslatability are both a project of capitalist valorization and an exit strategy from unfulfilling wage-labor arrangements.

Personalised nutrition (PN) has emerged as an approach to optimise individual health outcomes through more targeted and tailored dietary recommendations based on unique genetic, phenotypic, medical, lifestyle and contextual factors. The application of artificial intelligence (AI) presents an opportunity to achieve personalised nutrition advice at a scale that has population impact. This review introduces a nutrition audience to different AI applications and offers insights into the concepts of AI that might be relevant to the field of nutrition research. The current and future uses of AI in PN are discussed, as well as the potential benefits and challenges to their application. AI-driven solutions have the potential to improve health and reduce the risk of disease because they can consider more information about an individual in making recommendations. However, challenges such as data interoperability, ethical considerations, and model interpretability remain an issue limiting widespread use at this point. This review will provide a foundational understanding of the application of AI within PN and help to identify opportunities to leverage the potential of AI in transforming dietary guidance and enhancing health outcomes through innovative solutions.

International treaties commonly request States to submit periodic reports on measures adopted to facilitate compliance with relevant obligations, permitting them to identify shortcomings and develop appropriate policies, promote transparency and facilitate the exchange of good practices. International humanitarian law (IHL) might appear at odds with this approach as its core instruments do not establish a periodic reporting procedure; indeed, only limited reporting activities have been required from States party to the Geneva Conventions and their Additional Protocols. The present paper challenges this perspective, exploring mandatory periodic national reporting activities provided by other treaties forming part of the IHL framework, as in relation to cultural property and weapons systems, as well as more informal reporting mechanisms on IHL developed outside treaty regimes, including those addressing organized armed groups. Taking stock of existing approaches and practices, the paper identifies relevant trends, opportunities and challenges for IHL reporting activities.

Ion-acoustic waves in a dusty plasma are investigated where it is assumed that the ions follow a Cairns distribution and the electrons are Boltzmann distributed. Two theoretical methods are applied: Sagdeev pseudopotential analysis (SPA) and reductive perturbation theory (RPT). Since SPA incorporates all nonlinearities of the model it is the most accurate but deriving soliton profiles requires numerical integration of Poisson’s equation. By contrast, RPT is a perturbation method which at second order yields the Gardner equation incorporating both the quadratic nonlinearity of the Korteweg–de Vries (KdV) equation and the cubic nonlinearity of the modified KdV equation. For consistency with the perturbation scheme the coefficient of the quadratic term needs to be at least an order of magnitude smaller than the coefficient of the cubic term. Solving the Gardner equation yields an analytic expression of the soliton profile. Selecting an appropriate set of compositional parameters, the soliton solutions obtained from SPA and RPT are analysed and compared.

Investigating risk factors for mpox’s infectious period is vital for preventing this emerging disease, yet evidence remains scarce. This study aimed to identify risk factors associated with the duration of mpox infectiousness among mpox cases in Vietnam. The primary outcome was the duration of the mpox infectiousness, defined between symptom onset and the first negative test result for the mpox virus. Fine and Gray’s regression models were employed to assess the associations between the infectious period and several risk factors while accounting for competing risks of death by mpox. Most mpox cases recovered within 30 days. Patients with HIV or treated at multiple facilities for mpox had lower incidence rates of cleared infection compared to those who were HIV-negative or treated at a single facility. In regression models, patients with mpox symptoms of rash or mucosal lesions (sub-distribution hazard ratios = 0.62, 95% confidence interval = 0.46–0.83), ulcers (0.57, 0.41–0.80), or fever (0.62, 0.46–0.83) had significantly prolonged infectious periods than those without such symptoms. Our findings provided insights for managing mpox cases, especially those vulnerable to prolonged infectious periods in settings with sporadic cases reported.