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Addition of polymers modifies a turbulent flow in a manner that depends non-trivially on the interplay of fluid inertia, quantified by the Reynolds number $\textit{Re}$, and the elasticity of the dissolved polymers, given by the Deborah number $\textit{De}$. We use direct numerical simulations to study polymeric flows at different $\textit{Re}$ and $\textit{De}$ numbers, and uncover various features of their dynamics. Polymeric flows exhibit a non-unique scaling of the energy spectrum that is a function of $\textit{Re}$ and $\textit{De}$, owing to different dominant contributions to the total energy flux across scales, with the weakening of fluid nonlinearity with decreasing $\textit{Re}$ also leading to the reduction of the polymeric scaling range. This behaviour is also manifested in the real space scaling of structure functions. We also shed light on how the addition of polymers results in slowing down the fluid nonlinear cascade resulting in a depleted flux, as velocity fluctuations with less energy persist for longer times in polymeric flows, especially at intermediate $\textit{Re}$ numbers. These velocity fluctuations exhibit intermittent, large deviations similar to that in a Newtonian flow at large $\textit{Re}$, but differ more and more as $\textit{Re}$ becomes smaller. This observation is further supported by the statistics of fluid energy dissipation in polymeric flows, whose distributions collapse on to the Newtonian at large $\textit{Re}$, but increasingly differ from it as $\textit{Re}$ decreases. We also show that polymer dissipation is significantly less intermittent compared with fluid dissipation, and even less so when elasticity becomes large. Polymers, on an average, dissipate more energy when they are stretched more, which happens in extensional regions of the flow. However, owing to vortex stretching, regions with large rotation rates also correlate with large polymer extensions, albeit to a relatively less degree than extensional regions.
This study develops and expands some of the arguments of a lecture I delivered on the occasion of the 150th anniversary of the foundation of Cambridge’s Historical Tripos. Its central proposition – that it is meaningful to talk about ‘Cambridge History’ and to discuss its distinctiveness – remains central to this published version of the lecture, as does the idea that the Tripos has always embodied that distinctiveness as a form of social memory. Both the Tripos as a structure and the Faculty archive as a source come into play in helping to make sense of the Cambridge trajectory over the past half century. The lecture lays stress on some persistent legacies from the Cambridge tradition, identifies some strands that developed internally after 1945, and considers the impact of external influences on Cambridge History. Taking the story up to the ‘new’ Tripos of 2022, the lecture concludes that the legacy has exercised more control than has innovation and that the Historical Tripos is best understood as a continuing conversation with its own past.
For centuries, English law discriminated against Catholics and Jews. Those rules were mostly repealed in the 19th century, but surprisingly the law still says that a Catholic or Jewish person cannot advise the King on appointments within the Church of England or Church of Scotland. Ordinarily, new Church of England bishops are nominated by the King on the advice of the Prime Minister, but a Catholic or Jewish Prime Minister could not exercise that function; it would have to devolve on another Minister of the Crown. The article analyses the impact of this rule today, and, drawing on two interviews, considers how this rule was applied when Boris Johnson was Prime Minister. The article argues that the discriminatory rule should be repealed, allowing any Prime Minister, regardless of their faith or lack thereof, to carry out their duties in full.
Today, the Chancery Court is the appeal court for the province of York in the Church of England. There are some excellent specialised period-specific studies which take in the Chancery Court alongside other York church courts, mostly from the Borthwick Institute at York.1 However, there is no book exclusively devoted to the Chancery Court setting out its full history. The court is also rather neglected in standard texts on the history of English ecclesiastical law. Even the great Richard Helmholz has no index entry on it in his monumental history of canon law in England.2 Holdsworth in his well-known history of the common law has a page and a half on courts of the Archbishop of Canterbury; as to York’s archiepiscopal courts, he simply states they ‘corresponded’ to those of Canterbury.3 These are typical of most scholars today.4 This article, therefore, seeks to redress this imbalance – to correct what seems to be a case of juridical amnesia and so to unveil the forgotten, or hidden, Chancery Court of York. It offers a short history of the identity, jurisdiction, officers, records and processes, and jurisprudence of the Chancery Court of York. It also points out some key differences between the Chancery Court and its Canterbury equivalent, the Arches Court. The article focuses mainly on its post-Reformation history, as treated in the dispersed secondary literature – and it adds to this what the English ecclesiastical lawyers since the Reformation – civilians, common lawyers, and clerical jurists – say about this York court.
Services related to paid domestic work in private households are an important global labor market for migrant women. The Philippines is one of the largest exporters of work-force for the international domestic work sector. In this context, the linguistic legacy of American colonization becomes a key factor: English is an official language of the Philippines alongside Filipino. In addition, several varieties of Philippine English are widespread. Against this backdrop, Filipino and Filipina workers are positioned as competent, Anglophone workers in low-wage sectors such as the global domestic work market. Based on these attributions, they are also commodified as workers who can easily learn other languages and who are versatile and compatible with all linguistic and cultural spaces – worldwide. This paper sheds light on the multilingual repertoires of Filipina domestic workers in the Spanish capital, Madrid. The study is grounded in the paradigms of critical ethnographic sociolinguistics, migration linguistics and multilingualism research. The underlying data are based on narratives of Filipinas who migrated to Spain between 1971 and 2017. The findings reveal complex tensions around English. On the one hand, English is often perceived as prestigious and therefore valuable linguistic capital that can lead to social mobility. On the other hand, English is not seen as a panacea for securing employment beyond domestic work. Extrapolating from these findings, the overall picture that emerges is that English is deeply embedded in structurally determined social inequalities, which can be observed both in the country of origin and in the destination society.
Increasing evidence shows that genuine collaboration between scientists and Indigenous Peoples and local communities can deepen global understanding of species’ ecological distribution ranges, baselines and trends. In this study, we explore trends in bird body mass as reflected in the collective biocultural memory of 10 place-based communities on three continents. To do so, we conducted a globally coordinated survey, asking 1,434 adult participants about the most common bird species around their territories both at present and during their childhood. The survey resulted in 6,914 unique bird reports, corresponding to 283 bird species and covering an 80-year period (1940–2020). By combining our ethno-ornithological dataset with scientific data on species’ body mass, we assessed whether the composition of locally abundant bird assemblages has shifted towards smaller-bodied species over time. Our results show a general shift in the bird species observed over the participants’ lifetimes, with recent species assemblages being composed of species with smaller body sizes than those in the past. Despite variation among sites, we find an overall statistically significant body mass reduction of 72% across all sites over 80 years. This work illustrates that the depth of the current avian extinction crisis, which has been well documented by scientists, is also widely acknowledged by Indigenous Peoples and local communities through their deep ecological knowledge and place-based observations. It highlights the substantial benefits of establishing meaningful collaborations across different knowledge systems to increase the evidence basis that underpins biodiversity policy and practice.
For a split reductive group G we realise identities in the Grothendieck group of $\widehat{G}$-representations in terms of cycle relations between certain closed subschemes inside the affine Grassmannian. These closed subschemes are obtained as a degeneration of e-fold products of flag varieties and, under a bound on the Hodge type, we relate the geometry of these degenerations to that of moduli spaces of G-valued crystalline representations of $\operatorname{Gal}(\overline{K}/K)$ for $K/\mathbb{Q}_p$ a finite extension with ramification degree e. By transferring the aforementioned cycle relations to these moduli spaces we deduce one direction of the Breuil–Mézard conjecture for G-valued crystalline representations with small Hodge type.
The first-ever survey of weed flora near season end in commercial tomato (Solanum lycopersicum L.) fields in central Florida was conducted during the 2021 to 2022 field seasons. Forty-seven fields were surveyed, which represents a total of 593 ha. Fumigation occurred on 94% of all surveyed fields, and fertility and water were applied via drip tape on 77% of the fields, with furrow irrigation occurring on the remaining fields. Preemergence herbicides were applied under the plastic mulch on 74% of the fields, and herbicides were applied in all row middles. A total of 62 weed species escaped weed management and were identified during the season-end survey. Purple nutsedge (Cyperus rotundus L.), common purslane (Portulaca oleracea L.), goosegrass [Eleusine indica (L.) Gaertn.], and smooth crabgrass [Digitaria ischaemum (Schreb.) Schreb ex. Muhl.] occurred in the row middles of 74%, 70%, 68%, and 55% of all fields surveyed, and the same four species also had the highest relative abundance. Purple nutsedge (Cyperus rotundus L.), E. indica, P. oleracea, D. ischaemum, Florida pusley (Richardia scabra L.), and cutleaf evening primrose (Oenothera laciniata Hill) occurred in the transplant holes of 60%, 34%, 28%, 23%, 19%, and 15% of all fields surveyed. Cyperus rotundus had the highest relative abundance in the transplant holes by a large margin, followed by O. laciniata. Moving forward, this information will help tomato growers, extension agents, and weed scientists identify the key weeds that are likely to be problematic on tomato farms and will guide future weed management research programs.
Hallucinations and other unusual sensory experiences (USE) are common in people with psychosis. Yet access to effective psychological therapies remains limited. We evaluated if we can increase access to psychological therapy by using a brief treatment, focused only on understanding and dealing with hallucinations (Managing Unusual Sensory Experiences; MUSE), delivered by a less trained but more widely available workforce that harnessed the benefits (engaging content, standardisation) afforded by digital technology. The delivery of this in a real-world setting was considered within the non-adoption, abandonment, scale-up, spread, and sustainability (NASSS) framework.
Method:
Thirty-eight people with psychosis and distressing hallucinatory experiences were offered sessions of MUSE, delivered by trained and supervised assistant psychologists. MUSE was evaluated within an uncontrolled study conducted in routine clinical practice. Assessments pre- and post-treatment enabled consideration of the impact of the real-world intervention.
Results:
There was good uptake (88.4%), and receipt of MUSE (89% received four or more sessions). On average participants received 8.69 sessions. The participants reported significant reductions in voice hearing, paranoia, as well as improved quality of life. The feedback from the participants indicated that MUSE delivered by a less trained workforce was acceptable and beneficial.
Conclusions:
In a real-world setting we were able to offer and deliver sessions of a brief psychological psycho-education and coping skills enhancement package to people with distressing USE in the context of psychosis. The delivery of MUSE when considered against the NASSS framework appears to be a good candidate for adoption in services.
Critical International Relations Theory (CIRT) is in ‘crisis’. Some argue for a recovery of ‘the inspirational quality’ of Horkheimer and Adorno’s first-generation negative critique. Certainly the challenge of right-wing populism begs questions of CIRT’s ‘consolatory’ cosmopolitanism. I have two concerns however. First, these proposals underplay the reasons why first-generation theorising failed; secondly, CIRT risks throwing the second-generation Habermas–Linklater ‘baby’ out with the ‘bathwater’ at the moment it has particular value. I do two things. I look back to pre-Habermasian Critical Theory, but I set a future agenda based on the Pragmatism of John Dewey. This helps CIRT realise the emancipatory potential in IR’s recent ‘practice turn’, addressing concerns that CIRT is disengaged. It also brings balance to negative and positive critiques, offering a novel challenge to critical/problem-solving binaries in ways that speak to real-world challenges like climate change. Second, I look forward from Habermasian-inspired theory to the third-generation (and Pragmatist-inspired) ‘recognition theory’ of Honneth. This brings a critical edge to IR ontological security studies, further develops the praxeological branch of CIRT, and better informs the political left’s response to the alienating effects of the liberal international order and the rise of right-wing populism.
The death of Ella Kissi-Debrah in 2013 will be forever notable as the first instance in the United Kingdom of air pollution being recorded as contributing to the death of an individual. Whilst in itself a monumental shift in consideration of air pollution and the impact on human health, the recording by the coroner of Ella’s death as having been contributed to by air pollution has significant human rights implications. This piece considers the circumstances surrounding both Ella’s death and the report of the coroner and connects these to decisions of the European Court of Human Rights. It presents the argument that the failure to address a known risk to life presented by air pollution could constitute a breach of the right to life protected by Article 2 of the Convention for the Protection of Human Rights and Fundamental Freedoms (ECHR). Cases in which environmental conditions are found by the Court to have breached Article 2 are rare, but this paper contends that the formal acknowledgement of the threat of air pollution as a result of Ella’s death means that failure to address it meets this threshold.
Voluntary firearm safety actions avoid Second Amendment scrutiny, but rely on individuals recognizing their own risks. This could be aided by a network of healthcare professionals that have received proper training and information about all available tools to help prevent firearm-related suicide attempts, and combining the trust of clinicians and firearm owners could represent an opportunity to inform and educate in a manner that will engage patients.
The consolidation of village life in the southern Andes implied profound transformations in human lifeways and in people’s relationships with the environment, plants, and animals. Contributions from archaeological sciences have the potential to shed light on these transformations, particularly by providing new information about patterns of food production and consumption. In this article, we present the first results of organic residue analysis on ceramic containers of early village societies of northwestern Argentina (La Ciénega Valley, AD 200–600) by gas chromatography coupled with mass spectrometry (GC-MS). We tested previous characterizations of La Ciénega village’s subsistence strategies through the lens of absorbed organic residues in pottery. Preliminary evidence indicates a predominance of biomarkers associated with vegetable products in the vessels and a lower contribution of animal fats, suggesting a strong reliance on plant-based foods among early villager groups in La Ciénega settlements.
This essay examines how blackness is lived, perceived, and negotiated in (post)socialist Kazakhstan by placing the experiences of two “dual heritage” women—Aminata Uėdrаogo, a contemporary media personality, and Yelena Khanga, a Soviet and Russian-era journalist—in conversation. Prompted by a visit with Uėdrаogo in Almaty, I use autoethnographic and Black feminist methods to explore how blackness functions as both a limit and a possibility within shifting frameworks of race, ethnicity, and national belonging. While scholarship on intermarriage and ethnic mixing in Soviet Central Asia exists, contemporary experiences of people of African descent—particularly women—remain largely absent.1 Through their narratives and embodied experiences, I argue that blackness in Central Asia complicates the presumed rupture between socialist and post-socialist periods and unsettles dominant Eurocentric paradigms of race. This analysis calls for further inquiry into African diasporic presence and theorizations of blackness in Slavic, East European, and Eurasian contexts.