Systems of pneumatic transportation of cement and other fine materials with the minimum energy consumption

Transportation of fine construction materials during the manufacturing of concrete mixes iscarried out by systems of pneumatic transportation. The expense and pressure of air in thesystems are overstated during their design to avoid the blockage of pipelines. As a result, theenergy consumption of the equipment increases. At the same time, the equipment wear isaccelerated and the systems are operated on the unstable modes. Therefore, the operationalreliability of such equipment decreases and the process of cleaning of the exhaust air becomescomplicated. The solution of the problem of ecologically safety transportation of fineconstruction materials with the minimum energy consumption is given in the article. Theauthors developed a new type of energy saving systems of pneumatic transportation. It allowsreducing overstated reserves of the air expense and pressure during the design of the systems.Keywords: pneumatic transportation, fine materials. dust removal equipment, pape line

Squared-field amplitude modulus and radiation intensity nonequivalence within nonlinear slabs

This paper presents a novel approach to wave propagation inside the Fabry-Perot framework. It states that the time-averaged Poynting vector modulus could be nonequivalent with the squared-field amplitude modulus. This fact permits the introduction of a new kind of nonlinear medium whose nonlinearity is proportional to the time-averaged Poynting vector modulus. Its transmittance is calculated and found to differ with that obtained for the Kerr medium, whose nonlinearity is proportional to the squared-field amplitude modulus. The latter emphasizes the nonequivalence of these magnitudes. A space-time symmetry analysis shows that the Poynting nonlinearity should be only possible in noncentrosymmetric materials.Comment: 5 pages, 4 figures, added space-time symmetry analysis and reference

The strength research of the adhesive joints of sheet structures

The research results of stress-strained condition of constructional sheet materials are given inthe article. The strength dependence on type, configuration and sizes of adhesive joints isanalyzed. The research of the strength dependence was made on the samples from bakeliteplywood with the main types of adhesive joints. The research results in the specified range ofthe bonding lengths of the adhesive joints are determined by the equation, which was derivedby using the settlement of the problem of the tenses in the symmetric adhesive joints ofdifferent materials. The features of stress-strained condition of the specified adhesive joints,which were made from orthotropic material by stretching the samples, are shown in the article.The obtained results can be used for design of adhesive joints with two plates, overlappingand with one plate in the sheet structures.Keywords: adhesive joint; stress-strained condition, orthotropic material, bakelite plywoo

Influence of Formwork Structure on Heat Treatment of Precast Concrete Elements by Solar Energy

The present paper aims to study the influence of the formwork structure on the efficiency of heat treatment (HT) of precast concrete elements (PCE) by solar energy in various climatic conditions. The objects of the study were different types of formworks composed of solar energy equipment for HT of PCE. In total, six types of formworks, made of steel sheet, laminated plywood and timber, with and without insulation were studied. Calculation and experimental study were carried out for humid continental, and subtropical climates. Experimental study was carried out in the laboratory and in the open air. According to the obtained results, the heat insulation material in the formwork structure contributes to increase the strength of concrete. Formwork with heat insulation layer of 40 mm gave the best results. However, the level of the contribution depends on climatic conditions. Heat insulation material in the formwork structure is necessary in humid continental climate. Even the thickness of the insulation layer of 20 mm gives good results and the difference between the concrete strength with thickness of 20 mm and 40 mm is insignificant. On the contrary, in humid subtropical climate, the heat insulation material in the formwork structure is favorable, but not compulsory, since the difference between the concrete strengths is not significant and the strength values, obtained in all six types of formwork, allow it to be removed after 24 hours of curing

Surface-electronic structure of La(0001) and Lu(0001)

Most spectroscopic methods for studying the electronic structure of metal surfaces have the disadvantage that either only occupied or only unoccupied states can be probed, and the signal is cut at the Fermi edge. This leads to significant uncertainties, when states are very close to the Fermi level. By performing low-temperature scanning tunneling spectroscopy and ab initio calculations, we study the surface-electronic structure of La(0001) and Lu(0001), and demonstrate that in this way detailed information on the surface-electronic structure very close to the Fermi energy can be derived with high accuracy.Comment: 6 pages, 4 figures, 1 table submitted to PR

Future of the Artificial Intelligence: Object of Law or Legal Personality?

Objective: to reveal the problems associated with legal regulation of public relations, in which artificial intelligence systems are used, and to rationally comprehend the possibility of endowing such systems with a legal subject status, which is being discussed by legal scientists.Methods: the methodological basis of the research are the general scientific methods of analysis and synthesis, analogy, abstraction and classification. Among the legal methods primarily applied in the work are formal-legal, comparative-legal and systemic-structural methods, as well as the methods of law interpretation and legal modeling.Results: the authors present a review of the state of artificial intelligence development and its introduction into practice by the time of the research. Legal framework in this sphere is considered; the key current concepts of endowing artificial intelligence with a legal personality (individual, collective and gradient legal personality of artificial intelligence) are reviewed. Each approach is assessed; conclusions are made as to the most preferable amendments in the current legislation, which ceases to correspond to the reality. The growing inconsistency is due to the accelerated development of artificial intelligence and its spreading in various sectors of economy, social sphere, and in the nearest future – in public management. All this testifies to the increased risk of a break between legal matter and the changing social reality.Scientific novelty: scientific approaches are classified which endow artificial intelligence with a legal personality. Within each approach, the key moments are identified, the use of which will allow in the future creating legal constructs based on combinations, avoiding extremes and observing the balance between the interests of all parties. The optimal variant to define the legal status of artificial intelligence might be to include intellectual systems into a list of civil rights objects, but differentiating the legal regulation of artificial intelligence as an object of law and an “electronic agent” as a quasi subject of law. The demarcation line should be drawn depending on the functional differences between intellectual systems, while not only a robot but also a virtual intellectual system can be considered an “electronic agent”.Practical significance: the research materials can be used when preparing proposals for making amendments and additions to the current legislation, as well as when elaborating academic course and writing tutorials on the topics related to regulation of using artificial intelligence