Study on the influence of structure shape of semi armour piercing warhead on vertical armour piercing efficiency

In order to evaluate the impact of different warhead shapes on the damage efficiency of semi armour piercing warhead effectively, four common semi armour piercing warhead models are established based on Solidworks, and the deck model is established with reference to the deck data of an aircraft carrier. And then the material setting and grid division are carried out based on Ansys so as to construct the explicit dynamic simulation model. The credibility of the model is verified based on the residual velocity theory after the model being established. Finally, based on the established model, the simulation research on the influence of warhead shape on vertical armour piercing ability is carried out. The results show that under the same velocity, the armour piercing ability of sharp oval and conical warheads are better and their residual velocity are higher.

Material Sources of Grand Strategy

This chapter outlines material sources of grand strategy, such as the relative power of a state, the polarity of the international system, the regional balance of power, geography, and technology. It argues that these material factors, reflecting the material environment within which states interact, set the table for grand strategy construction and, therefore, have a profound impact on grand strategy, although they do not completely determine grand strategy. The material setting sets the parameters within which national leaders make decisions and prioritize goals within a given set of national institutions and in a particular cultural context. Furthermore, we provide concrete empirical examples of the mechanisms through which these factors impact state grand strategy.

Research on Optimal Proportion and Performance of Cement-Clay Slurry

For the cement-clay slurry commonly used in dynamic water grouting, consider adding coal ash to optimize the performance of cement-clay slag composite slurry and discuss the reaction mechanism of the slurry through microchemical element analysis; the orthogonal test was used to study the influence of various factors on material setting time, solidification ratio, water segregation rate, and the optimized ratio of the slurry that was obtained by integrating the unconfined compressive strength of grouting concretion body and slurry configuration cost. The results showed that the water-solid ratio had the greatest influence on the comprehensive performance, followed by the amount of coal ash admixture. The best performance of the composite slurry was obtained with a water-solid ratio of 0.8:1 and a cement:coal ash:clay:quicklime:sodium sulfate:water mass ratio of 1:0.45:0.20:0.05:0.07:1.32. Finally, by comparing the mechanical properties of the optimized slurry and the grouting concretion body, it is proved that the optimized slurry has superior performance to meet the general grouting project requirement.

Transformers and Generative Adversarial Networks for Liveness Detection in Multitarget Fingerprint Sensors

Fingerprint-based biometric systems have grown rapidly as they are used for various applications including mobile payments, international border security, and financial transactions. The widespread nature of these systems renders them vulnerable to presentation attacks. Hence, improving the generalization ability of fingerprint presentation attack detection (PAD) in cross-sensor and cross-material setting is of primary importance. In this work, we propose a solution based on a transformers and generative adversarial networks (GANs). Our aim is to reduce the distribution shift between fingerprint representations coming from multiple target sensors. In the experiments, we validate the proposed methodology on the public LivDet2015 dataset provided by the liveness detection competition. The experimental results show that the proposed architecture yields an increase in average classification accuracy from 68.52% up to 83.12% after adaptation.

Managing participation and turn-taking in children’s digital activities: touch in blocking a peer’s hand

This article investigates touch in the social organization of digital classroom activities as small groups of primary school pupils animate a story by using a shared iPad. Such a socio-material setting foregrounds haptic resources for action and requires coordination of hand movements on and around the screen. The groups in our data treat the animation as a product that takes its shape through the individual members operating the device one at a time. Our analysis focuses on how the haptic practice of blocking a peer’s hand is deployed to manage competition for a turn at using the tablet and to resolve the problem of its simultaneous manual operation by two or more participants. The blocks we describe are non-intensive human-to-human touches with varying duration whereby one participant prevents another from accessing the screen by sweeping the latter’s hand aside or grabbing and holding it. We show through a multimodal analysis how blocks accomplish the social action of claiming a turn for the blocker by investigating how they emerge sequentially, how participants operating the tablet anticipate peer interruption with ready-to-block hand movements, and how blocks are complied with or resisted. In our conclusion, we consider to what extent the young children in our data treat blocks as morally problematic and socially controlling actions, and how digital technologies shape educational practices.

Boundaries

Although boundaries feature prominently on our maps of the Empire, this chapter argues that they did not pose a particular obstacle to most travellers until the mid-eighteenth century. One circumstance in which territorial borders became relevant were safe-conduct processions. Neighbouring rulers had to agree on the boundaries at which their escorts handed over travellers, creating an opportunity to confirm, challenge, and negotiate territorial boundaries. Using manuscript drawings and paintings from Mühldorf in Bavaria, this chapter discusses the importance of visual records and the material setting in these situations. However, concerning everyday forms of mobility, borders only played a subordinate role. Self-designed maps show that tolls were not usually levied at territorial boundaries, but at toll stations along important thoroughfares. Before the mid-eighteenth century, the geography of governed mobility is therefore more appropriately understood in terms of channels and corridors than through territories and boundaries, a quality the Empire shared with other polities outside Europe.

Home Truths and Uncomfortable Spaces: Swiss Hotels and Literature of the 1920s

Switzerland was at the centre of the European grand hotel scene, geographically and discursively. This article considers Swiss hotel literature and life in the 1920s, a decade in which the country’s hotel landscape became politicized and, relatedly, was often portrayed in popular literature. Against the backdrop of more canonical and intellectual hotel literature set in Switzerland, the following reads Meinrad Inglin’s Grand Hotel Excelsior (1928) as a response to a contemporary ‘culture war’, and as an attempt at centrist cultural criticism. Drawing especially on magazine and other archival evidence, this article also uncovers the promotion, sponsorship and discussion of hotel literature by Swiss hotel lobbyists, which was concerned with increasing the commercial viability of hotels after the First World War, and improving their image at a time of polarized debates about the direction of Swiss society. Thus Inglin’s novel occupies a centre ground not only in its argument, but in a formal sense as well. Grand Hotel Excelsior is a literary means of mediating the problems of Swiss culture in the 1920s, manifest in hotels as actual spaces or subjects, rather than a novel written for, or adaptable to, vested interests, or a work that employs – in the vein of Thomas Mann and Hermann Hesse – the hotel as a material setting to explore abstract ideas.

Passing Glasses

Passing an object is an everyday action with which most people are familiar. It involves detailed organizations of the body within a spatial and material setting. One place where objects are continuously passed is at the optician. Based on more than 700 hours of video recordings at 11 Danish opticians, this article shows how passing glasses is accomplished in an institutional context where the optician is interactionally constructed as responsible for securing the safe passing and avoiding the (problematic) drop. The paper contributes to EMCA studies on passings by showing how these actions may display deontic responsibilities, and how the passings are accomplished mainly by the optician using a specific grip, relying on tactile experiences, constantly monitoring the customer behaviour, and embodily anticipating next actions.

How ‘shared’ is shared reading: Book-focused infant–educator interactions in long day-care centres

Children's language experiences in the first two years of life are inextricably connected with their current and future language and literacy development. Research has shown that mother–child shared reading of picture books is a practice that can promote this development. Little is known, however, about the shared reading experiences of infants attending early childhood education and care centres. This naturalistic study analysed the reading experiences of 10 infants observed during a three-hour period as they and their educators went about their typical activities in their early childhood education and care centres. Drawing on Halliday's systemic functional linguistic theory, which proposes a non-arbitrary relationship between language use and features of the material setting, this study analysed two aspects of the infants' shared reading experiences: the tenor (roles and relationships) realised in the educators' use of speech function, and the field (the topic or subject matter) realised in the vocabulary used. The manner in which these contextual variables are realised in the adult–child talk during shared reading affects the pedagogical potential of this practice. The findings reveal that the infants had little opportunity to initiate or participate in book-focused interactions with their educators, with implications for their language and literacy learning opportunities.

The Soundscape of Becoming Place: Rhythms and Voices of Village des Tanneries

Place can be understood as not a fixed geographical location, but as an event that emerges in the encounter between continually transforming materialand human elements, social relations and practices; that place is composed of strands of human experience, memory, histories and stories in a particular material setting. This article draws on Amin and Thrift’s “ontology of encounter” and Lefebvre’s method of rhythmanalysis to explore the complex interactions of geography, social practices and city environment. An “auditory turn” offers ways of thinking about the mobilities, encounters and narratives of an urban neighbourhood that combine and merge to give rise to a soundscape. A turn toward the sensory and auditory offers new paths for analysis in urban geography, mobilities and infrastructure studies.