Tensile Flow Behaviour and Fracture Studies of Beta Titanium Alloys at Elevated Temperatures

Tensile testing on metastable beta alloy with various microstructures was carried out in this study. Beta 21S is a metastable alloy that exhibits a wide range of material characteristics depending on the processing techniques used. Three different sheets that have been used in this paper which has the same substance but three different microstructures. At a strain rate of 0.001/s, the tensile test was done on a single sheet at five different temperatures. The sheet has developed varied microstructures, the tensile nature of the material varies the alloy’s characteristics. Mechanical characteristics for 400°C, 500°C, 600°C, and 7000°C are described for 21S sheets. The alpha phase sheet elongated at room temperature by 1-3 %, whereas the pure beta phase sheet elongated by 22-24 %. There is a significant improvement in the extension of the sheet with the variation in temperature for the alpha phase. The elongation of the pure beta phase does not alter as the temperature rises. The fracture surface was tested at all temperatures and the optimal temperature for forming the sheet has been determined

Graphene: A Multifunctional Nanomaterial with Versatile Applications

Graphene is a 2D material of high quality obtained from a single atom with unique electronic properties. Graphene has the potential to improve the efficiency, versatility, and durability of a wide range of materials and their applications, but its commercial exploitation will require further study. Due to its flatness and semiconductivity in addition to its high surface area, high mechanical rigidity, high thermal stability, superior thermal conductivity, and electrical conductivity, good biocompatibility, and easy functionalization, graphene is the best candidate for multifunctional applications which opened up new possibilities for potential devices and systems. Every type of graphene material is found to exhibit different and unique tunable properties. Graphene is the best candidate in making nanocomposite-based electrochemical sensors. Graphene is among the best electronic materials, but synthesizing a single sheet of graphene has received less attention. The objective of this chapter is to bring awareness to readers on the synthesis, properties, and applications of graphene. The limitations of the current knowledge base and prospective research directions related to graphene materials have also been illustrated.

Drift of elastic floating ice sheets by waves and current, part I: single sheet

The drift motion of a freely floating deformable ice sheet in shallow water subjected to incident nonlinear waves and uniform current is studied by use of the Green–Naghdi theory for the fluid motion and the thin plate theory for an elastic sheet. The nonlinear wave- and current-induced forces are obtained by integrating the hydrodynamic pressure around the body. The oscillations and translational motion of the sheet are then determined by substituting the flow-induced forces into the equation of motion of the body. The resulting governing equations, boundary and matching conditions are solved in two dimensions with a finite difference technique. The surge and drift motions of the sheet are analysed in a broad range of body parameters and various wave-current conditions. It is demonstrated that wavelength to sheet length ratio plays an important role in the drift response of the floating sheet, while the sheet mass and rigidity have comparatively less impact. It is also observed that while the presence of the ambient current changes the drift speed significantly (almost linearly), it has little to no effect on its oscillations. However, under the same ambient current, the drift speed changes remarkably by the wave period (or wavelength).

Exceptional topological insulators

We introduce the exceptional topological insulator (ETI), a non-Hermitian topological state of matter that features exotic non-Hermitian surface states which can only exist within the three-dimensional topological bulk embedding. We show how this phase can evolve from a Weyl semimetal or Hermitian three-dimensional topological insulator close to criticality when quasiparticles acquire a finite lifetime. The ETI does not require any symmetry to be stabilized. It is characterized by a bulk energy point gap, and exhibits robust surface states that cover the bulk gap as a single sheet of complex eigenvalues or with a single exceptional point. The ETI can be induced universally in gapless solid-state systems, thereby setting a paradigm for non-Hermitian topological matter.

Artistic image in furniture craft

The paper is devoted to the role of wood in the art of furniture. The work traces the typological relationship of certain types of furniture designed in the twentieth century with the prototypes of the XVIII and XIX centuries. The paper argues about the possibilities of the material for creating aesthetically significant furniture samples. The stage in recognizing the new possibilities of technologically processed wood is the furniture by J. Summers, which revealed the possibility of designing a chair from a single sheet of plywood “in one piece” without structural connections. H. Peak, C. Mollino, Ch. R. Eames, S. Yanagi worked in the same direction. Chipboard is the last of the materials discussed in the paper. The appeal to the archaic box-type design was laid in the works by Rietveld, M. Bill, and G. Gugelot. In the wake of the architecture, deconstruction in the furniture design can be seen in the works by F. and W. Campana.

SCOPE 2021: a new scorecard for osteoporosis in Europe

Summary This scorecard summarises key indicators of the burden of osteoporosis and its management in the 27 member states of the European Union, as well as the UK and Switzerland. The resulting scorecard elements, assembled on a single sheet, provide a unique overview of osteoporosis in Europe. Introduction The scorecard for osteoporosis in Europe (SCOPE) is a project of the International Osteoporosis Foundation (IOF) that seeks to raise awareness of osteoporosis care in Europe. The aim of this project was to develop a scorecard and background documents to draw attention to gaps and inequalities in the provision of primary and secondary prevention of fractures due to osteoporosis. Methods The SCOPE panel reviewed the information available on osteoporosis and the resulting fractures for each of the 27 countries of the European Union plus the UK and Switzerland (termed EU27+2). The information obtained covered four domains: background information (e.g. the burden of osteoporosis and fractures), policy framework, service provision and service uptake, e.g. the proportion of men and women at high risk that do not receive treatment (the treatment gap). Results There was a marked difference in fracture risk among the EU27+2 countries. Of concern was the marked heterogeneity in the policy framework, service provision and service uptake for osteoporotic fracture that bore little relation to the fracture burden. For example, despite the wide availability of treatments to prevent fractures, in the majority of the EU27+2, only a minority of patients at high risk receive treatment even after their first fracture. The elements of each domain in each country were scored and coded using a traffic light system (red, orange, green) and used to synthesise a scorecard. The resulting scorecard elements, assembled on a single sheet, provide a unique overview of osteoporosis in Europe. Conclusions The scorecard enables healthcare professionals and policy makers to assess their country’s general approach to the disease and provide indicators to inform the future provision of healthcare.

Early Modern Literature of Crime and Criminals

The literature of crime and criminals in early modern England takes several forms. The main form is the printed pamphlet, typically a short quarto publication of eight to sixteen pages, costing a few pence. Another form is the broadside ballad, usually anonymous, printed on one side of a single sheet and accompanied by an image and an indication of the music to be used. A selection of plays about real-life domestic crime, including the well-known Arden of Faversham, attributed variously in recent years to Shakespeare and Kyd, have also survived. While they are few in number, and less topical than the pamphlets, they have attracted more critical attention than the other forms. The crimes featured in this writing—often involving murder but also including witchcraft, and disproportionally focused on women—were chosen for their sensational value and were in no way representative of the reality of crime in the period. While some pamphlet writers made claims for the truth of their accounts, and rival accounts of the more notable crimes using differing details did appear, the aims and social functions of this writing had less to do with providing information than with reinforcing the authority of the state, its laws, and its Protestant religion. Hence, many accounts of crimes, particularly in the earlier part of the period, are shaped by the need to demonstrate the role of providence in bringing about the discovery of the perpetrators. Crime, conflated with sin, was conceptualized as a moral rather than a social problem; criminals were often regarded as acting under the irresistible compulsion of the devil and once found guilty of a single lapse proceeding inevitably toward actions that damned them to hell. The idea of crime as a secular problem in which social and economic forces had a role to play was beginning to develop and becomes more evident in writing of the later 17th century. Certain crimes emerged as iconic in the period, particularly involving women who killed, and featured in a number of different print forms, for example, the murders by their wives of Arden of Faversham, Page of Plymouth, and George Sanders. The law differentiated by gender in cases of spousal murder; husband-murder was categorized as petty treason, hence punishable by burning at the stake for the wife, while wife-killing (much commoner in actuality but less prominent in literature) was simply homicide. Early modern crime writing largely reflects the structures of power in the society that produced it; evidence of questioning or challenging accepted attitudes toward issues of criminal responsibility does exist, but the era of pioneering journalism was a long way ahead.

The past, the present and the future of nanotechnologies

Artists from the time of Mesopotamia or Egypt and in the Middle Ages astonished us with various coloured Stained-glass windows, prepared with the help of metal nanoparticles. The paper will deal with zeolites, nanoparticles and carbon nanotubes. The latter will be developed more extensively, because we have founded the Nanocyl company, selling carbon nanotubes and it has become the best European company. One carbon nanotube is 100,000 times thinner than a human hair, it is very light – twice as light as aluminium –, its mechanical resistance is much higher than that of steel and it conducts electricity better than metal conductors. The use of carbon nanotubes is very important in nanotechnology. For example, with the help of coiled carbon nanotubes, the weight of a single nanoparticle can be measured, it is equal to one femtogram (10−15 gram). Carbon nanotubes are used in car spray painting to cancel the build-up of static electricity. With the help of carbon nanotubes, it is possible to decrease the velocity of flame propagation, when they are included in composite materials. Carbon nanotubes are also very good as sensors for toxic gases. Their uses will take up the most part of this paper. The future of nanotechnology will be illustrated by nanomachines, by the lift between the Earth and the Moon, and by graphene (one single sheet of graphite). The use of carbon nanotubes will be evoked in waste water cleaning, in the production of drinking water from seawater.