Mineralogical features of two orebodies, lenses (C-3 and C-4), at the central part of the Oktyabr'sky deposit have been investigated. Multidirectional mineralogical zoning in the northern and southern orebodies is shown, confirming the hypothesis of their formation from various magmatic flows, which have individual features and their own modes of formation. The southern C-3 and northern C-4 orebodies differ in their mineralogical associations: C-3 is characterised by a high-sulfur association of sulfides; and C-4 contains minerals with a sulfur deficit (talnakhite, sugakiite). Variations in Fe and Ni ratios in pentlandite are controlled by the volatility of sulfur during ore crystallisation. Direct crystallisation zoning is observed in the disseminated ores of the C-4 orebody (borehole RT-107), where the fugacity of sulfur ($f_{S_2}$) increases from bottom to top. In contrast in orebody C-3 (borehole RT-30) $f_{S_2}$ decreases in the same direction. This reverse zoning coincides with the vectors of the evolution of ore systems in various blocks of the Main Ore Body of the Oktyabr'sky deposit. The difference in typomorphic features of disseminated ores of the southern and northern orebodies is confirmed by differences in the associations of platinum-group element minerals (PGMs). Disseminated ores in picritic gabbro-dolerites and massive pyrrhotite ores in the exocontact of the intrusion within the southern orebody differ in the specialisation of PGMs: the former is characterised by minerals of the Pd–Bi–Sb–Te system, the latter by only Pt minerals. The similarity of these types of ores lies in the similar reverse mineralogical and geochemical zoning from top to bottom along the sections, caused by the evolution of the sulfide melt in this direction. The formation of reverse zoning of disseminated ores (zones of ‘marginal reversion’) is probably due to the action of a mechanism of repeated influx of a melt of an increasingly primitive composition into the upper parts of the crystallising flow. Unidirectional trends in massive and disseminated ores are more likely to be due to the action of the same type of mechanism.

In this paper, we study the functional given by the integral of the mean curvature of a convex set with Gaussian weight with Gaussian volume constraint. It was conjectured that the ball centred at the origin is the only minimizer of such a functional for certain values of the mass. We prove that this is the case in dimension 2 while in higher dimension the situation is different. In fact, for small values of mass, the ball centred at the origin is a local minimizer, while for larger values the ball is a maximizer among convex sets with a uniform bound on the curvature.

In light of findings from research on informal foreign/second language (L2) learning, with a focus on English as a target language and using the concept of extramural English (EE), this position paper argues that learners’ engagement in EE (through activities such as watching television or films or playing digital games) constitutes an important individual difference (ID) variable that needs to be included in studies that aim to measure L2 English proficiency or development. In addition, it is suggested that if EE as an ID variable is left out in such studies in the future, the rationale for exclusion should be clearly stated. This position paper also discusses research instruments and methods used in this area of research, the benefits and drawbacks of different methods, and identifies research gaps and under-researched learner groups. Further, it is argued that in some contexts, EE has replaced classroom activities as the starting point for and foundation of learning English.

Politicians’ ability to provide national security to the public is deeply enmeshed in conceptions of the state and of leadership. This article incorporates securitization, feminist, and political communication theories to consider whether gendered and militarized conceptions of national security have different effects for politicians who are women and those who are men. Although scholarship suggests that signaling military bona fides—such as invoking one’s veteran status—can help politicians claim that certain policies are a matter of national security, we consider whether this ability will be gendered. Relying on two national studies, we find results that are contrary to our original predictions. First, we find that military bona fides do help women be seen as leaders. However, we do not find evidence that bona fides increase the “authority” to identify and address national security threats for any politicians.

We show that firms’ left-tail risk positively predicts future returns of crash insurance. We proxy crash insurance with bear spreads, an option trading strategy that profits when extreme negative returns occur. Crash insurance for high (low) left-tail risk firms earns positive (negative) returns, suggesting that the downside protection it provides is not adequately priced. Our results are mainly explained by two types of underreaction: volatility underreaction in high left-tail risk portfolios and underreaction to the persistence of left-tail risk. Disagreement partially explains our results, but a risk-based approach does not.

To mark Queen Victoria's jubilee celebrations, many Indian authors composed laudatory literature and music in their vernacular languages. Although these works were often dismissed as “enthusiastic effusions” from poets of dubious ability, they offer intricate examples of the varied meanings the queen's presence had for Indian writers. They illustrate the subtle manipulation of laudatory verse for purposes other than praise; and they frequently offer instances of sophisticated, multilingual intertextuality and reuses of literary traditions of praise (and subversion) in India's precolonial past. This article examines examples of Persianate laudatory writing produced by three Parsi writers in colonial India and demonstrates how these works performed “loyalty” in contested, ambivalent ways.

In this essay, I explore two main areas of Rowan Williams’ theology of revelation. The former is his reflections on the silence of God – God’s reticence to clarify himself to us amid our theological and spiritual confusion. I argue that he is not denying that God has genuinely revealed himself to us, but rather Williams is grappling with – and exhorting us to grapple with – the limits of that revelation. The second area I explore is his theory of revelation as generative phenomena, and how his theory underwrites his understanding of church tradition and, mainly, scripture. Williams argues that there is a division within scripture between the parts containing true divine revelation and the parts containing humanity’s broken response to that revelation. I argue that this view, while it is very well formulated and has some merits, cannot surmount the epistemological obstacle of how biased and interested humans can adequately differentiate between these parts within scripture.

We apply Takesaki’s and Connes’s ideas on structure analysis for type III factors to the study of links (a short term of Markov kernels) appearing in asymptotic representation theory.

In recent years, the variation in firms' tax-avoidance behavior has attracted a lot of attention, both theoretically and empirically. This study investigates the governance role of multiple large shareholders in firms' tax-avoidance behavior, using a sample of Chinese state-controlled listed firms over the period 2004–2016. We find that the ownership stake of a firm's largest shareholder is negatively associated with tax avoidance among state-controlled firms. Second, other large non-state shareholders negatively affect tax avoidance of state-controlled firms. The former effect is particularly strong when the local government is the controlling shareholder. Finally, differences in institutional quality influence the largest shareholder's tendency to engage in tax avoidance in state-controlled firms. For state-controlled firms, a better institutional environment elicits more tax avoidance and thus curtails minority-investor expropriation.

We first sequenced and characterised the complete mitochondrial genome of Toxocara apodeme, then studied the evolutionary relationship of the species within Toxocaridae. The complete mitochondrial genome was amplified using PCR with 14 specific primers. The mitogenome length was 14303 bp in size, including 12 PCGs (encoding 3,423 amino acids), 22 tRNAs, 2 rRNAs, and 2 NCRs, with 68.38% A+T contents. The mt genomes of T. apodemi had relatively compact structures with 11 intergenic spacers and 5 overlaps. Comparative analyses of the nucleotide sequences of complete mt genomes showed that T. apodemi had higher identities with T. canis than other congeners. A sliding window analysis of 12 PCGs among 5 Toxocara species indicated that nad4 had the highest sequence divergence, and cox1 was the least variable gene. Relative synonymous codon usage showed that UUG, ACU, CCU, CGU, and UCU most frequently occurred in the complete genomes of T. apodemi. The Ka/Ks ratio showed that all Toxocara mt genes were subject to purification selection. The largest genetic distance between T. apodemi and the other 4 congeneric species was found in nad2, and the smallest was found in cox2. Phylogenetic analyses based on the concatenated amino acid sequences of 12 PCGs demonstrated that T. apodemi formed a distinct branch and was always a sister taxon to other congeneric species. The present study determined the complete mt genome sequences of T. apodemi, which provide novel genetic markers for further studies of the taxonomy, population genetics, and systematics of the Toxocaridae nematodes.

The current study was motivated by an interest in deepening understanding of Brazilian twin research, which is underrepresented internationally, in an effort to rectify this situation. Our aim was threefold: (1) to carry out a comprehensive investigation of Brazilian research on twins according to the area of knowledge; (2) to evaluate the representation of research in the field of psychology in comparison with other areas; (3) to evaluate characteristics of the research that may have contributed to its exclusion from the comprehensive meta-analysis of 50 years of twin research. A scoping review was performed according to PRISMA guidelines. Titles and abstracts were searched up to 2022 in six databases: CAPES, BDLTD, PePSIC, PubMed, Google Scholar, and SciELO, using selected keywords both in Portuguese and in English (e.g., ‘twins’ and ‘Brazil’; ‘twinning’ and ‘Brazil’; ‘gemelaridade’ [twinning], and ‘gêmeos’ [twins]). Three hundred and forty publications were included in the review. Approximately half (53.8‰) used the classic twin design to investigate the heritability of several traits, and the other half (46.2%) used other research designs. The scoping review showed that the number of publications doubled approximately every 10 years. Most publications were from the health area, with medicine accounting for approximately half of the studies, followed by psychology, odontology, and biology. We found that the interest in studying twins among Brazilian scientists is increasing over the years and there are reasons to be enthusiastic about the potential impact of this trend in the global scenario.