Petrographic structures: Khibiny ijolites and urtites

In addition to the standard description of the structures and textures of crystalline rocks the mathematical approaches have been proposed based on a rigorous determination of the petrographic structure through the probabilities of binary intergrain contacts. In general, the petrographic structure is defined as an invariant aspect of rock organization, algebraically expressed by the canonical diagonal form of the symmetric Pij matrix and geometrically visualized by structural indicatrices - surfaces of the 2nd order. The agreed nomenclature of possible petrographic structures for an n-mineral rock is simple: the symbol Snm means that there are exactly m positive numbers in the canonical diagonal form of the Pij matrix. New types of barycentric diagrams have been proposed. To describe the massive texture, the concept of Hardy - Weinberg equilibrium has been proposed. This boundary classifies barycentric diagrams into areas within which canonical types of Рij matrices and topological types of structural indicatrices are preserved. The change in the organization of the rock within a type is quantitative, the transition from one type to another means structural restructuring. The methods are used to describe ijolites and urtites of the Khibiny massif, the Kola Peninsula. In the modern taxonomy of rocks, the boundaries between them are mostly conditional and are drawn according to the contents of rock-forming minerals, for example, between ijolites and urtites - according to the contents of nepheline and pyroxene. The strict definition of the petrographic structure proposed by the authors makes it possible to introduce into petrography the constitutional principle (structure + composition), which is successfully acting in mineralogy.

Model Of Diagnostics And Improvement Of Quality Of Preparation For Professional Activity Based On Integration Of Pedagogical And Technical Knowledge

In this article the model of diagnostics and improvement of quality of preparation for professional activity on the basis of integration of pedagogical and technical knowledge and its contents are described. Expert model is a standard description that provides successful solutions to emerging problems in the manufacturing industry, defines certain qualities and reflects the professional knowledge and self-development of a professional, and is one of the types of qualifications that are specific to each position and job. professional activities, tasks and responsibilities, personal qualities, knowledge and skills.

Wormhole calculus, replicas, and entropies

We investigate contributions of spacetime wormholes, describing baby universe emission and absorption, to calculations of entropies and correlation functions, for example those based on the replica method. We find that the rules of the “wormhole calculus”, developed in the 1980s, together with standard quantum mechanical prescriptions for computing entropies and correlators, imply definite rules for limited patterns of connection between replica factors in simple calculations. These results stand in contrast with assumptions that all topologies connecting replicas should be summed over, and call into question the explanation for the latter. In a “free” approximation baby universes introduce probability distributions for coupling constants, and we review and extend arguments that successive experiments in a “parent” universe increasingly precisely fix such couplings, resulting in ultimately pure evolution. Once this has happened, the nontrivial question remains of how topology-changing effects can modify the standard description of black hole information loss.

Status of the data sharing policies of scholarly journals published in Brazil, France, and Korea and listed in both the 2018 Scimago Journal and Country Ranking and the Web of Science

Purpose: The present study analyzed the current status of the data sharing policies of journals published in Brazil, France, and Korea that were listed in the 2018 Scimago Journal and Country Ranking and Web of Science Core Collection.Methods: Web of Science journals were selected from the 2018 Scimago Journal and Country Ranking. The homepages of all target journals were searched for the presence of statements on data sharing policies, including clinical trial data sharing policies, the level of the policies, and actual statements of data availability in articles.Results: Out of 565 journals from these three countries, 118 (20.9%) had an optional data sharing policy, and one had a mandatory data sharing policy. Harvard Dataverse was the repository of one journal. The number of journals that had adopted a data sharing policy was 11 (6.7%) for Brazil, 64 (27.6%) for France, and 44 (25.9%) for Korea. One journal from Brazil and 20 journals from Korea had adopted clinical trial data sharing policies in accordance with the International Committee of Medical Journal Editors. Statements of data sharing were found in articles from two journals.Conclusion: Journals from France and Korea adopted data sharing policies more actively than those from Brazil. However, the actual implementation of these policies through descriptions of data availability in articles remains rare. In many journals that appear to have data sharing policies, those policies may just reflect a standard description by the publisher, especially in France. Actual data sharing was not found to be frequent.

Development challenges of contemporary enterprises

Goal – this article’s main goal is to showing that the truly important economic processes happen at the microeconomic level, they happen in enterprises. This is where the surplus value is produced. Producing this value is not easy, however, and is associated with a number of challenges. Research methodology – the author focuses on the descriptive method, which shows, on the one hand, the importance of activity at the microeconomic level, and on the other hand, indicating selected challenges faced by modern enterprises. Score/results – the article allowed to indicate the specificity of conditions in which modern enterprises operate. Large number of them are able to maintain their position in the industry for a very long time. It is able, but it is not so sure. In the conditions of global competition, nothing is certain in the long run, including the position of enterprises. They can work better or worse, they can be very small or larger, they can grow or curl, unfortunately they also fall. Originality/value – the article is a standard description of economic reality. It has no novelty or innovative aspects, it only organizes the described reality.

Black holes in the quantum universe

A succinct summary is given of the problem of reconciling observation of black hole-like objects with quantum mechanics. If quantum black holes behave like subsystems, and also decay, their information must be transferred to their environments. Interactions that accomplish this with ‘minimal’ departure from a standard description are parametrized. Possible sensitivity of gravitational wave or very long baseline interferometric observations to these interactions is briefly outlined. This article is part of a discussion meeting issue ‘Topological avatars of new physics’.

Modeling nanoribbon peeling

Lifting and peeling of 2D materials and nanoribbons off surfaces is common in nanoscience. Solution of an analytical model shows that structural lubricity makes the peeling of a nanoribbon or film radically different from the standard description of peeling of immobile, fully glued films.

On the Arrow of Spacetime

Consistent with special relativity and statistical physics, here we construct a partition function of space-time events. The union of these two theories resolves longstanding problems regarding time. We will argue that it augments the standard description of time given by the (non-relativistic) arrow of time to one able to describe the past, the present and the future in a manner consistent with our macroscopic experience of such. First, using Fermi-Dirac statistics, we find that the system essentially describes a "waterfall" of space-time events. This "waterfall" recedes in space-time at the speed of light towards the direction of the future as it "floods" local space with events that it depletes from the past. In this union, an observer $\mathcal{O}$ will perceive two horizons that can be interpreted as hiding events behind them. The first is an event horizon and its entropy hides events in the regions that $\mathcal{O}$ cannot see. The second is a time horizon, and its entropy "shields" events from $\mathcal{O}$'s causal influence. As only past events are "shielded" and not future events, an asymmetry in time is thus created. Finally, future events are hidden by an entropy prohibiting $\mathcal{O}$ from knowing the future before the present catches on.