To save content items to your account,
please confirm that you agree to abide by our usage policies.
If this is the first time you use this feature, you will be asked to authorise Cambridge Core to connect with your account.
Find out more about saving content to .
To save content items to your Kindle, first ensure no-reply@cambridge.org
is added to your Approved Personal Document E-mail List under your Personal Document Settings
on the Manage Your Content and Devices page of your Amazon account. Then enter the ‘name’ part
of your Kindle email address below.
Find out more about saving to your Kindle.
Note you can select to save to either the @free.kindle.com or @kindle.com variations.
‘@free.kindle.com’ emails are free but can only be saved to your device when it is connected to wi-fi.
‘@kindle.com’ emails can be delivered even when you are not connected to wi-fi, but note that service fees apply.
Aircraft with bio-inspired flapping wings that are operated in low-density atmospheric environments encounter unique challenges associated with the low density. The low density results in the requirement of high operating velocities of aircraft to generate sufficient lift resulting in significant compressibility effects. Here, we perform numerical simulations to investigate the compressibility effects on the lift generation of a bio-inspired wing during hovering flight using an immersed boundary method. The aim of this study is to develop a scaling law to understand how the lift is influenced by the Reynolds and Mach numbers, and the associated flow physics. Our simulations have identified a critical Mach number of approximately $0.6$ defined by the average wing-tip velocity. When the Mach number is lower than 0.6, compressibility does not have significant effects on the lift or flow fields, while when the Mach number is greater than $0.6$, the lift coefficient decreases linearly with increasing Mach number, due to the drastic change in the pressure on the wing surface caused by unsteady shock waves. Moreover, the decay rate is dependent on the Reynolds number and the angle of attack. Based on these observations, we propose a scaling law for the lift of a hovering flapping wing by considering compressible and viscous effects, with the scaled lift showing excellent collapse.
The article tells the story of the remains of the last Russian Tsar Nicholas II and his family, who were killed in Ekaterinburg in 1918, discovered in 1979, found again in 1991, solemnly buried in 1998, and canonized as saints by the Russian Orthodox Church in 2000. Thoroughly researched in the cause of official criminal investigation and identified with genetic tests in several labs in Russia and abroad, the royal remains have not been recognized by the Church. The failure to reach a consensus on the veracity of the remains of the Romanovs occurred in parallel with the inability to decide what to do with the mummified body of Soviet founder Vladimir Lenin, a contemporary of Nicholas II who has been kept in a mausoleum in the Red Square since the 1920s. Though, after 1991, voices have been raised for removing his body from this symbolic center of the country, no consensus has been reached so far as to where to move it and why. Revisiting Verdery’s famous work, the present article argues that such a movement necessitates a political commitment to voicing new notions of belonging and citizenship. The liminal status of these two bodies proves that the contemporary state in Russia is a continuation of both the Soviet and imperial state programs, not a new political structure like other post-socialist countries. Based on the works by Kantorowicz and Cherniavsky, this research develops the concept of popular theopolitics and aims to examine how people’s political and religious ontologies make use of the Tsar’s image.
E. L. Mascall devoted much of his early scholarly career to developing accounts of analogy and natural theology grounded in the study both of Thomas Aquinas and in his Thomist successors. This essay examines Mascall’s account of analogy in relation to other views on analogy in his day, finding that in the 1950s, ‘image’ becomes at least as important a category for Mascall as ‘analogy’. Even while beginning from Thomist metaphysical standpoints and motivated by Thomist considerations, Mascall develops an account of thinking and speaking about God that diverges from his Thomist contemporaries, resembling more the thought of his ‘para-Thomist’ friend and colleague, Austin Farrer.
The timeless and unchanging nature of God was defended by Dr. Eric Mascall throughout his books. He argued against process theology, and in particular the works of mathematician and philosopher Alfred North Whitehead, who was one of its foremost exponents. In his books, Mascall defended the distinction between our temporal and created nature and God’s divine and uncreated nature as found in historic theology. In a manner suited to his learning, he discussed the implications of modern physics for theology.
Former president Trump has maintained broad support despite falsely contending that he was the victim of electoral fraud, also known as the “big lie.” We consider both the antecedents of this phenomenon and its consequences. We propose that Trump supporters’ already established deep personal alignment—identity fusion—with their leader predisposed them to believe the lie. Accepting it then set the foundation for other identity-protecting beliefs and attitudes. Using a three-wave panel of Trump supporters, we found that the more fused they were before the 2020 election, the stronger their belief in the big lie grew between 2021 and 2024. Accepting the big lie helped solidify fusion with Trump and had consequences for related attitudes. Belief in the big lie predicted downplaying the criminal charges against Trump and supporting his antidemocratic policy agenda. Fueled by and fueling further fusion, belief in the big lie is a primary component of a larger narrative that emboldens Trump and justifies antidemocratic behavior.
Parkinson disease (PD) is a neurological disorder that affects more than 10 million people worldwide, impacting both quality of life and marital relationships. Divorce rates are higher in Western compared to Eastern countries. However, it is unclear if there are differences in marital status after PD onset between the two regions.
Methods:
We searched MEDLINE and Embase from inception to March 31, 2024. Original studies discussing marital status in participants with PD were included. An unmarried status includes single, widowed, divorced or separated. Outcomes included the prevalence of being unmarried, measured as proportions, and the risk ratio (RR) of being unmarried in participants with PD relative to controls.
Results:
Out of 567 studies screened initially, 55 studies involving 3,723,966 participants were included. The prevalence of being unmarried was evaluated in 55 studies (25.16%; 95% CI: 21.52–29.18). The prevalence of being unmarried was significantly higher in countries in the West compared to the East (28.83%; 95% CI: 25.09–32.89 vs 17.47%; 95% CI: 12.10–24.57, p < 0.01). Compared to controls, the risk of being unmarried in PD participants after the onset of PD was significantly higher in the East (RR: 1.21, 95% CI: 0.91–1.60) compared to the West (RR: 0.87, 95% CI: 0.65–1.15).
Conclusions:
Our meta-analysis showed significantly higher rates of being unmarried in Western compared to Eastern countries. After PD onset, participants in the East were at significantly higher risk of being unmarried compared to participants in the West, suggesting that differences in cultural practices, societal norms and healthcare systems may affect marital status outcomes in PD participants.
Models for slow flow of dense granular materials often treat the medium as incompressible, thereby neglecting the role of Reynolds dilatancy. However, recent particle simulations have demonstrated the presence of a significant coupling between the volume fraction and velocity fields. The model of Dsouza & Nott (J. Fluid Mech., vol. 888, 2020, R3) incorporates dilatancy and captures the coupling, but it has thus far lacked experimental validation. In this paper, we provide the first experimental demonstration of dilatancy and its coupling to the kinematics in a two-dimensional cylindrical Couette cell. We find a shear layer near the inner cylinder within which there is significant dilation. Within the shear layer, the azimuthal velocity decays roughly exponentially and the volume fraction rises with radial distance from the inner cylinder. The predictions of the model of Dsouza & Nott (2020) are in good agreement with the experimental data for a variety of roughness features of the outer cylinder. Moreover, by comparing the steady states resulting from different initial volume fraction profiles (but having the same average), we show the inter-dependence of the velocity and volume fraction fields, as predicted by the model. Our results establish the importance of shear dilatancy even in systems of constant volume.
Consider a possibly unsaturated Fell bundle $\mathcal {A}\to G$ over a locally compact, possibly non-Hausdorff, groupoid G. We list four notions of continuity of representations of $\mathit {C_c}(G;\mathcal {A})$ on a Hilbert space and prove their equivalence. This allows us to define the full $\mathit {C}^*$-algebra of the Fell bundle in different ways.
Studying complexes of cryptic or pseudocryptic species opens new horizons for the understanding of speciation processes, an important yet vague issue for the digeneans. We investigated a hemiuroidean trematode Lecithaster salmonis across a wide geographic range including the northern European seas (White, Barents, and Pechora), East Siberian Sea, and the Pacific Northwest (Sea of Okhotsk and Sea of Japan). The goals were to explore the genetic diversity within L. salmonis through mitochondrial (cox1 and nad5 genes) and ribosomal (ITS1, ITS2, 28S rDNA) marker sequences, to study morphometry of maritae, and to revise the life cycle data. Mitochondrial markers showed that L. salmonis is likely divided into six lineages (referred to as operational taxonomic units, OTUs), which often occur in sympatry, sometimes in a single host specimen. Variation in rDNA was not consistent with that in the mitochondrial markers. Morphometric analysis of maritae was performed for four out of six OTUs; it showed that some OTUs had significant differences from the others, but some did not. The effect of host species on the morphometric characteristics cannot be excluded. Intramolluscan stages were identified for two OTUs; they differed clearly by the structure of cercariae and also by the species of the first intermediate host. The case of L. salmonis is instructive in how different criteria for species delimitation can contradict each other. We regard this as a sign of recent or ongoing speciation and suggest using the name Lecithaster cf. salmonis. The most promising criteria to differentiate genetic lineages within L. cf. salmonis are first intermediate hosts and morphological characteristics of the cercariae: shape of the delivery tube and caudal cyst, and length of the filamentous appendage.
Cystic Echinococcosis (CE) is a zoonotic disease caused by Echinococcus granulosus sensu lato. Diagnosing CE primarily relies on imaging techniques, and there is a crucial need for an objective laboratory test to enhance the diagnostic process. Today, cell-free DNAs (cfDNAs) have gained importance regarding their biomarker potential. This study aims to investigate the diagnostic capabilities of different cfDNA targets (Echinococcus-specific repeat sequences (mgs-4 and mgs-12) and partial fragment of repetitive sequence (EG1 Hae III)) and evaluate their diagnostic effectiveness when compared to a frequently used commercial E.granulosus-specific IgG ELISA. Seventy-six confirmed hepatic CE patients and healthy controls were included in the study. The EG1 Hae III region was assessed using nested PCR, whereas real-time PCR was employed to investigate other cfDNA targets. Analysis of the cfDNA-targeted tests indicated that mgs-4 demonstrated the highest diagnostic efficacy in distinguishing CE patients from healthy controls, achieving a sensitivity of 60.5% (p = 0.002). Combining ELISA with the mgs-4 target led to an increased sensitivity of 72.4% for distinguishing between CE patients and the control group. The sensitivity rates for ELISA and the three cfDNA targets varied among the groups. Active CE patients showed sensitivity rates of 52.9%, 52.9%, 23.5%, and 52.9% for ELISA, mgs-4, mgs-12, and EG1 Hae III assays, respectively. In contrast, inactive cyst patients displayed sensitivity rates of 21.4%, 66.7%, 19%, and 42.9% for the corresponding assays. The mgs-4, either alone or in combination with ELISA, demonstrated notably higher sensitivity values for CE diagnosis in all group comparisons compared to serology.
This article examines sermons for the crusade against the Hussite king of Bohemia, George of Poděbrady, preached by Thomas Harder, an Augustinian canon and parish priest in Klosterneuburg, in the summer of 1467. These texts give us a direct insight into how preachers in fifteenth-century parishes might have dealt with the general commission to publicize the crusade, as they incorporate the crusade agenda into the pastoral content. Like his twelfth and thirteenth-century predecessors, Thomas Harder knew how to exploit the penitential and edifying potential of the crusade, combined with concerns for individual religious improvement and moral reform. Through an analysis of intertextual links, this study shows that he also systematically gathered, processed and disseminated topical information relevant to the fight against Bohemian heresy. Although he followed in the footsteps of high medieval crusade preachers in the themes he addressed, he also drew on more contemporary and local sources to inform his discourse and provide explanation of the immediate political circumstances.
Why could politicians of religious minority backgrounds become national leaders in some countries soon after modern representative institutions were adopted, whereas in some other countries, almost all the national leaders have been from the religious majority background for decades if not centuries? I argue that the most important factor explaining the incidence of national leaders of a religious minority background or lack thereof is whether the main adversary in the constitutive conflict that established the nation-state was of the same religious sectarian background or not. Nations established in a constitutive conflict against an adversary of the same religion are much more likely to have national leaders of a religious minority background. Furthermore, political leaders of religious minority backgrounds have three “secular” paths out of their marginality, which is also determined by the combination and nature of the primary external and internal conflict of the nation. I examine these paths through the cases of Britain (liberalism), France (socialism), and Hungary and Italy (nationalism). Finally, I examine a world-historical example of pattern change, the rise of Catholic-origin national leaders in previously Protestant-led Germany, which was due to a new constitutive conflict (World War II and the Holocaust) that altered the national-religious configuration.
Eric Mascall and Karl Barth shared a common concern with the influence of liberal Protestantism on their churches in England and Germany. They agreed this problem was best addressed through the lens of natural theology. Yet, while for Mascall a Thomistically informed understanding of natural theology was the best way to counteract liberal Protestantism’s influence on the Church, for Barth, natural theology was to blame for the Church’s confusion. The concern this paper raises was Barth’s sharp delineation between human reason and divine revelation in the end, complicit with the ontological duality of modernity that was the basis of the liberal Protestantism he was rejecting? By dealing with modernity on its own terms, Barth undermined the capacity of the Church’s ministry of Word and Sacrament to be effective agents of personal transformation. Whereas Mascall’s realistic ontology not only repudiates the idealist foundations of liberal Protestantism but also offers the Church the necessary ontology foundation for understanding its ministry of Word and Sacrament as effective embodiments of God’s transforming grace.