История капитального ремонта на фоне безграничной лжи: Дворец бракосочетания в Иркутске

The article tells about the competition for the design for repair of the Palace of Wedding in Irkutsk and its realization. It touches upon the participation of the author and the architect in designing the repairs and the necessity of the designer's supervision. It criticizes inappropriate actions of the planning institution that realized the design for repair.Излагается история проведения конкурса на проект и проведение капитального ремонта Дворца Бракосочетания в Иркутске. Ставится вопрос об участии автора-архитектора в проектировании капитального ремонта и необходимости авторского надзора. Подвергаются критике некорректные действия проектной организации, осуществлявшей проект капитального ремонта

Direct laser printing of high-resolution physically unclonable anti-counterfeit labels

Security labels combining facile structural color readout and physically unclonable one-way function (PUF) approach provide promising strategy for fighting against forgery of marketable products. Here, we justify direct femtosecond-laser printing, a simple and scalable technology, for fabrication of high-resolution (12500 dots per inch) and durable PUF labels with a substantially large encoding capacity of 10$^{895}$ and a simple spectroscopy-free optical signal readout. The proposed tags are comprised of laser-printed plasmonic nanostructures exhibiting unique light scattering behavior and unclonable 3D geometry. Uncontrollable stochastic variation of the nanostructure geometry in the process of their spot-by-spot printing results in random and broadband variation of the scattering color of each laser printed "pixel", making laser-printed patterns unique and suitable for PUF labeling.Comment: 5 pages, 3 figure

Mathematical knowledge ontologies and recommender systems for collections of documents in physics and mathematics

© 2016, Pleiades Publishing, Ltd.An approach to the implementation of a recommender system based on ontologies of mathematical knowledge is presented. On the basis of a document browsed by a user, the system forms on line a list of recommendations, which include similar documents, key words, and definitions of these words from ontology and other terminological sources. The method of recommendations yields a vector representation of documents, taking into account the position of terms in the logical structure of the document and their ontological connections. On the basis of the cosine measure, a measure of proximity between documents is calculated. The order of documents in the list of recommendations is determined by values of the proximity measure. Various adaptations of the system to user scenarios aimed at the preparation of personalized recommendations are discussed

Protective Nanocomposite Vacuum Coatings Deposited by Separated Plasma Flows

The way of generation of protective nanostructure vacuum coatings by separated plasma flows was investigated. In order to limit the crystallite growth in the coatings the compound of the growing condensate was doped by Al. Nanocrystalline (Ti,Al)N coatings with grain size 10-20 nm and microhardness 35-40 GPa by means of vacuum-arc deposition technique from the separated plasma flows were obtained. It was determined that purposeful alloying improved operational coatings properties, and allowed using them as protective layers, deposited on the working surfaces of the cutting tools during timber-based material processing

Giant and tunable excitonic optical anisotropy in single-crystal CsPbX3_3 halide perovskites

During the last years, giant optical anisotropy demonstrated its paramount importance for light manipulation which resulted in numerous applications ranging from subdiffraction light guiding to switchable nanolasers. In spite of recent advances in the field, achieving continuous tunability of optical anisotropy remains an outstanding challenge. Here, we present a solution to the problem through chemical alteration of the ratio of halogen atoms (X = Br or Cl) in single-crystal CsPbX$_3$ halide perovskites. It turns out that the anisotropy originates from an excitonic resonance in the perovskite, which spectral position and strength are determined by the halogens composition. As a result, we manage to continually modify the optical anisotropy by 0.14. We also discover that the halide perovskite can demonstrate optical anisotropy up to 0.6 in the visible range -- the largest value among non-van der Waals materials. Moreover, our results reveal that this anisotropy could be in-plane and out-of-plane, depending on perovskite shape -- rectangular and square. Hence, it can serve as an additional degree of freedom for anisotropy manipulation. As a practical demonstration, we created perovskite anisotropic nanowaveguides and show a significant impact of anisotropy on high-order guiding modes. These findings pave the way for halide perovskites as a next-generation platform for tunable anisotropic photonics.Comment: 18 pages, 3 figure

Многокомпонентные защитные покрытия, осаждаемые вакуумно-дуговым методом

A way of generation of protective nanostructural coatings from separated multicomponent plasma flows is suggested. The influence of elemental composition on their structure-mechanical characteristics was studied. It's found, multicomponent coatings are characterized by the dense super fine-grained structure, possess enhanced antifriction and anticorrosion properties in comparison with nitride titanium coatings.Для формирования защитных наноструктурированных покрытий предложен способ осаждения из сепарированных многокомпонентных потоков. Изучено влияние элементного состава покрытий на их структурно-механические характеристики. Определено, что многокомпонентные покрытия характеризуются плотной, ультрамелкозернистой структурой, обладают улучшенными антифрикционными и антикоррозионными свойствами по сравнению с покрытиями из нитрида титана