bluuebunny/crossref_metadata_2025_split huggingface dataset:
Moisture regime of enclosing structures with different thickness of insulation layer
Authors: Gagarin V G , Khavanov P A , Zubarev K P 
Published: August 2020

Abstract
Construction industry has different problems including the moisture regime of enclosing structures. If we want to protect an enclosing structure from the negative impact of moisture, we need to evaluate a moisture balance transfer. We used well-known graphical method to calculate the maximum wetting plane positions in three enclosing structures, which are represented the composite insulating systems with external plaster layers, aerated concrete bases and mineral wool insulations. These researching encloses differ only by thicknesses of insulation layers. It was found that the maximum wetting plane is located between the insulation layer and the external plaster layer. Moreover, when the indoor climate parameters change, the position of the maximum wetting plane does not change. However, it is determined that with a significant increase in the thickness of the insulation, the second maximum wetting plane appears inside the aerated concrete layer. This phenomenon was called as «overheating effect». To assess the position of the second maximum wetting plane we developed the criterion “relative displacement coordinate of maximum wetting plane” and obtained the graphic dependence of the introduced criterion and the thickness of the insulation.
Architectural and decorative concrete with photoluminescent pigment
Authors: Suleymanova Lyudmila , Maliukova Marina , Koryakina Alina 
Published: August 2020

Abstract
The authors received glowing products from architectural and decorative concrete with the use of photoluminescent pigment, formed in various positions and any configuration that does not lose their architectural expressiveness over a long period of operation. The use of products with a glow effect provides increased safety at night and is an additional means of signaling on dangerous and worst-lit sections of roads, parking lots, bicycle paths. Optimally selected materials and the method of surface treatment of products provide decorativeness of small architectural forms in the daytime. The compositions of architectural and decorative concrete were designed and the influence of the quantitative content of photoluminescent pigment on the main physico-mechanical characteristics was evaluated. The rheological properties of cement suspensions and architectural and decorative concrete based on them are studied, and the decorativeness and luminescence of products with photoluminescent pigment are evaluated according to the methods developed by the authors. The resulting recommended composition of glowing architectural and decorative concrete with using white Portland cement (CEM I 52.5 N), fractionated marble crushing waste 0.2-0.5; 0.5-1.0; 1.5-2.0; 3.0-7.0; 5.0-10.0; 10.0-20.0, modifier of polycarboxylate type and photoluminescent pigment, allows to obtain the products with a glow effect, high architectural, decorative and physico-mechanical characteristics that correspond to the operating conditions.
Technological settlement due to protection of the existing buildings
Authors: Nikiforova N S , Konnov A V 
Published: August 2020

Abstract
Values of technological settlement caused by technological impacts during protective measures installation were obtained for existing buildings in the zone of deep excavation influence. Neglecting the technological part in settlement prediction of adjacent buildings can lead to their unserviceability. The technological settlement was determined by following methods: geodetic measurements of buildings settlements, numerical modelling and analogy method. The technological settlement was determined for 4 types of geological conditions that can be applied to geo conditions of Moscow and soft soils of St. Petersburg and Hanoi (Vietnam). The authors recommend values of technological settlement for the underpinning with micropiles, jet-grouting columns, the installation of a jet-grouting cut-off wall and changing a foundation type to a slab. A formula is given for the calculation of technological settlement along the building due to changes in a protection design. A satisfactory converge of predicted settlements of buildings in the influence zone of deep excavations considering technological part with geodetic measurements data was achieved for construction projects in Moscow and St. Petersburg. Obtained values of technological settlement made it possible to propose recommendations on choice of protection measures ensuring safety of adjacent buildings.
Load-carrying capacity of bolted joints of timber structures under static loading
Authors: Aleksiievets V I , Aleksiievets I I , Ivaniuk A M , Roshchina S I 
Published: August 2020

Abstract
The paper is devoted to the study of the single loads effect on the load-carrying capacity and deformability of bolted joints of wooden structures. The introduction substantiates the relevance of the topic, gives a general description of the work, its scientific novelty and practical value. The authors propose an experimental technique for determining the load-carrying capacity of bolted joints when separating the deformation of the dowel hole and that of tensile strain of bolts. The operation of such joints was experimentally and theoretically investigated. The study resulted in statistical confirmation of satisfactory convergence between the theoretical data obtained by the proposed method and the experimental data of the authors, as well as the recommendations on practical application of the suggested calculation method were developed. The deformations of the bolt and the wood were experimentally separated, the diagrams of the deformation of the stretched zone of the bolt were made, and the percentage ratio of the bolt deformations to the total deformations of the entire joint was calculated. To describe the process of the bolt joint deformation due to the action of single static loads, it is recommended to use a hyperbolic dependence, which well reflects the relationship between the load-strain values (F-Δ). A new method is proposed for calculating the bearing capacity of bolted joints, which is based on the use of the initial modulus of strain capacity E0
and the strain capacity coefficient of the joint β. According to this technique, the load-carrying capacity of bolted joints with various geometric characteristics was calculated. The ratio of theoretical values of load-carrying capacity to the experimental values by, on average, 30% showed a greater convergence when compared to the load-carrying capacity calculated according to the current regulatory documents.
Precast monolithic coating of an industrial building based on variable-height beam-slabs
Authors: Lisyatnikov M S , Shishov I I , Sergeev M S , Hisham E 
Published: August 2020

Abstract
We consider the coatings of single-story industrial buildings of frame type, which in a typical solution are made in the form of a flooring of ribbed plates on rafters, trusses or arches. There is a high complexity of manufacturing, transportation and installation of structures and a large height of the coating. We offer truss beams-slabs of box-shaped cross-section, the height of which varies stepwise along the length, being limited by a square parabola at the top. Beams are installed on the substructure structures in a row, and between them on a permanent formwork of wooden boards are arranged monolithic sections of the plate. The calculation of deformations is performed taking into account the inelastic deformation of concrete and rebar in accordance with the recommended norms of state diagrams: three-line for concrete and two-line for rebar. The results of the calculation of a beam-plate with a span of 30 m, which has 5 different stages, the height of which is selected so that the required cross-section of the reinforcement remains constant along the entire length of the structure.
Strengthening of the operated wooden floor beams with external rigid reinforcement
Authors: Lukin M V , Roshchina S I , Smirnov E A , Shunqi Mei 
Published: August 2020

Abstract
Reinforced wooden floor beams with rigid reinforcement were studied from a rolling channel fixed to the body of the beam by means of obliquely glued reinforcing rods. The experimental study of four variants of reinforced solid-wood beams was performed on a unique stationary stand using an eight-point loading scheme that simulates a load evenly distributed over the beam span. When reinforcing beams by the proposed method, the load-bearing capacity increases by 47 … 66%, and the deformability decreases by 54…62%, depending on the location of the rigid reinforcement (top or bottom of the beam) and the inclination of the glued rods (according to the main compressive or tensile stresses). When the reinforcement elements are placed on top of the beams, their load-bearing capacity is on average 18% higher than at the bottom. It is experimentally proved that the destruction of reinforced beams is fragile, which in turn excludes the possibility of their collapse from chipping and splitting in the supporting sections. Research has proved the high efficiency of using the developed method of reinforcement during major repairs and strengthening of buildings in use.
High-Performance Thermal Insulation Material Based on Waste Glass
Authors: Panov Y T , Ermolaeva E V , Nikonov A V , Timakov E A 
Published: August 2020

Abstract
The article is devoted to the development technology of obtaining and properties of heat-insulating environmentally safe material production from waste glass. The subject of the study is a finely fraction of a mixture of window and container glass. Differential scanning calorimetry was used, the study of the gas release process was carried out on a specially designed and manufactured installation. Developed a foaming composition consisting of calcium carbonate and sodium nitrate, which allows you to combine the decomposition temperature of the main gas-forming agent (calcium carbonate) and the softening temperature of the glass, which is a necessary condition for obtaining a foam material with a minimum apparent density. The optimal mass ratio of sodium nitrate and calcium carbonate (100:35), the foaming temperature (700 ° C) and particle sizes (less than 60 microns) were determined, allowing to obtain a material with a density of 80-100 kg/m3. The dependence of the apparent density of the obtained material on the time of foaming and the content of the gas-forming agent is obtained by mathematical modeling, which allows determining the optimal time of foaming at different temperatures. During the development of the technology, factors affecting the properties of the resulting foam material were identified, and the dependence of the main technological parameters on these factors was established. For the production of thermal insulation material, a continuous powder method is proposed, including the processes of preparing a foaming composition and producing foam blocks. The developed material has a lower coefficient of thermal conductivity, higher strength and low density compared to existing analogues and does not emit hydrogen sulfide during operation. According to the developed technology, a pilot batch of foam glass was produced, which was used by a number of construction companies in various areas of construction.
Gypsum composites with glass granules
Authors: Petropavlovskaya V B , Buryanov A F , Novichenkova T B , Petropavlovskii K S 
Published: August 2020

Abstract
The article explored the possibility of reducing the average density of self-reinforced gypsum composites. Gypsum matrix and glass hollow granules leads to the appearance of a synergistic effect. It manifests itself in the formation of a compacted gypsum reinforced matrix, which is filled with microspheres. This provides a modified gypsum stone with high technical indicators. The volume of use of glass hollow granules is increasing every year, including in the construction industry. This material, unique in its properties, provides very high compressive strength, low water absorption, low heat conductivity, high chemical resistance, and radio transparency for its composite materials. The method of obtaining this light filler is a combination of complex physicochemical and hydrodynamic processes that occur during the formation of hollow balls from microparticles of glass melt. Creating effective composites based on glass micro granules as a component in the molding of gypsum products opens up new possibilities for designers and technologists. This will significantly expand their scope.
Quantum polariton trigger
Authors: Khudaiberganov Timur , Arakelian Sergey 
Published: August 2020

Abstract
We present a device model of the polariton logic element that is able to work both with classical and quantum signals. This device uses the nonlinear and quantum properties of exciton-polaritons. The mathematical description of our model is based on stochastic quantum equations with a complex diffusion in the Ito formalism with the corresponding quasi-probability in the quantum phase space. It is shown that the stationary states in the bistable mode can be controlled by both classical and quantum signals through the stochastic resonance within the region of quantum phase transition. Based on these properties, the model of the quantum logic elements has been developed.
Experimental and computational research of supersonic and hypersonic flow around cube shaped fragments in the air
Authors: Gerasimov Sergei I , Erofeev Vladimir I , Kikeev Vasily A , Kuzmin Vadim A , Zharov Alexei N , Novikov Ilya A 
Published: August 2020

AbstractA numerical and experimental research of supersonic and hypersonic air flow round cubic fragments, differently oriented relative to the direction of the incoming flow was carried out. The results of visualizing supersonic airflow round cubic fragments are rendered by two methods: a theoretical one, based on a mathematical model by way of numerical solution of the Reynolds - averaged complete Navier-Stokes equations, and an experimental one using shadowgraphy.
Analysis of the powder material and the structure of samples obtained from an aluminum alloy by selective laser melting
Authors: Raznoschikov A S , Kochuyev D A , Voznesenskaya A A , Oparin E S , Khorkov K S 
Published: August 2020

Abstract
By selective laser melting, samples were synthesized from the powder material of the AlSi10Mg alloy. All samples are made of aluminum alloy metal powder. Granulometric analysis data and particle morphology were studied to determine the suitability of the powder used in the selective laser melting. To identify structural defects, the samples were polished from the end and from the side of the building platform. Using a metallographic microscope, the porosity of samples made at a flow rate from 7.28 * 105 to 2.23 * 106 was analyzed. The geometric shape matching of the initial three-dimensional model was analyzed using the holes in the samples as an example. The results of particle size analysis, sphericity of particles of powder material, as well as metallographic analysis of samples can be used to improve the performance of parts obtained from AlSi10Mg aluminum alloy by selective laser melting.
Models of the formation of roughness on the surface of materials and the movement of molten flows under the laser melting processes
Authors: Bukharov D N , Kucherik A O , Arakelian S M 
Published: August 2020

Abstract
We used the nonlinear hydrodynamic model of the motion of molten flows to determine the basic geometric characteristics of the resulting coatings in a laser experiment. To test the capabilities of the developed algorithm, a series of calculations was performed for various values of Reynolds numbers (Re) and certain sizes of the computational domains with several cavities with different configurations. The influence of the channel geometry is clearly noticeable in the case of a deep depression. The direction of motion of different structures (e.g. the vortex) was predicted. Using the convection model, we estimate the temperature field and velocity distribution in the system under consideration for various initial conditions and experimental regimes selected. The profile of the arising island on the surface was modeled by a scaling computational domain with the number of particles N = pS, where the parameter p – determined the viscosity of melted material, and S - the area of the computational domain. The influences of the two key parameters, i.e. probability of adhesion (sc) and viscosity (p), on the obtained surface profile of materials can be estimated by our approach, and result in different deposition images, being finally principal for functional characteristics of the samples under the specific regimes of laser treatment.
Thallene: graphene-like honeycomb lattice of Tl atoms frozen on single-layer NiSi2
Authors: Gruznev D V , Bondarenko L V , Tupchaya A Y , Mihalyuk A N , Eremeev S V , Zotov A V , Saranin A A 
Published: August 2020

Abstract
The post-graphene materials termed also as 2D-Xenes (X = Si, Ge, Sn, Pb, As, Sb or Bi) are atomic-layer sheets comprised of single-element atoms arranged in a honeycomb lattice on a suitable substrate. In the present report, we introduce a new member to the current 2D-Xene family, thallene built of atoms of the Group-III element, thallium (Tl). It is formed when 2/3 monolayer of mobile Tl atoms on a single-layer NiSi2 atop Si(111) substrate crystallizes upon cooling below ∼ 150 K into a

3

×

3

-R30° superstructure with a honeycomb geometry. As compared to the hypothetical free-standing thallene layer, the thallene on the NiSi2/Si(111) substrate experiences a strong tensile strain. It was recognized that though the substrate can virtually tune the thallene into the topological phase, in reality the intrinsic electronic properties of thallene are suppressed due to the hybridization with electrons of the NiSi2/Si(111) substrate.
Molecular dynamics study on axial mechanical properties of calcium silicate hydrate
Authors: Huang Jianzhang , Fan Yue , Ouyang Xiaowei , Han Qiang 
Published: August 2020

Abstract
The axial mechanical properties of calcium silicate hydrate during uniaxial tension or stress have been investigated by molecular dynamic simulations. Based on the classic calcium-silicate-hydrate model, the influence of calcium to silicate ratio and temperature are studied in detail. It demonstrated that calcium silicate hydrate with different Ca/Si ratio have similar stress-strain curves under uniaxial compression, but greatly difference on the uniaxial tension behaviors. The uniaxial tensile properties was affected by temperature that the strain rate in the low-temperature is higher than that in high temperature. The work in this paper reveals the mechanical properties of calcium silicate hydrate at the nanoscale and establishes the foundation explore the failure mechanism of cement or cement-based materials.
Land, energy and water resource management and its impact on GHG emissions, electricity supply and food production- Insights from a Ugandan case study
Authors: Sridharan Vignesh , Shivakumar Abhishek , Niet Taco , Ramos Eunice Pereira , Howells Mark 
Published: August 2020

Abstract
Despite the excitement around the nexus between land, energy and water resource systems, policies enacted to govern and use these resources are still formulated in isolation, without considering the interdependencies. Using a Ugandan case study, we highlight the impact that one policy change in the energy system will have on other resource systems. We focus on deforestation, long term electricity supply planning, crop production, water consumption, land-use change and climate impacting greenhouse gas (GHG) trajectories. In this study, an open-source integrated modelling framework is used to map the ripple effects of a policy change related to reducing biomass consumption. We find that, despite the reduction in deforestation of woodlands and forests, the GHG emissions in the power sector are expected to increase in between 2040–2050, owing to higher fossil fuel usage. This policy change is also likely to increase the cost of electricity generation, which in turn affects the agricultural land types. There is an unforeseen shift from irrigated to rainfed type land due to higher electricity costs. With this integrated model setup for Uganda, we highlight the need for integrated policy planning that takes into consideration the interlinkages between the resource systems and cross propagation effects.
Long-term power degradation testing of piezoelectric vibration energy harvesters for low-frequency applications
Authors: Hirst Jacob , Wang Jie , Nabawy Mostafa R A , Cioncolini Andrea 
Published: August 2020

Abstract
Piezoelectric energy harvesters represent a viable and well-proven solution to convert ambient vibrations into useful electric power within a number of modern life applications. Whilst a large amount of studies has focused on improving power output from these devices, relatively little research has been directed to investigate how these devices degrade over time and the effect this has on long-term power generation. This paper, therefore, aims to experimentally investigate how piezoelectric vibration energy harvesters degrade during long-term operation in realistic harvesting conditions. The harvesters tested are unimorph cantilevers based on three of the most commonly used piezoelectric options: polyvinylidene fluoride (PVDF), Macro Fiber Composite (MFC), and Quick Pack (QP). Testing was carried out under single-frequency excitation (10–40 Hz) of 1g amplitude for three million vibration cycles. Our results show that the natural frequency and the optimum load resistance of the harvesters may vary during prolonged operation. Importantly, a larger cumulative variation in natural frequency and optimum load resistance yields a larger variation in power output, thereby linking the variation in power to the variation of the mechanical and/or electrical properties of the harvesters. Comparing the average power values over the testing period we found that increasing the tip mass does not necessarily improve the average power output, suggesting that a larger tip mass may exacerbate the degradation of the mechanical and/or electrical properties of the harvester. This was particularly evident for the stiffest QP harvesters which showed the highest signs of power degradation; nevertheless, QP harvesters still managed to demonstrate the highest power density values. When cost consideration is taken into account in the assessment, PVDF harvesters managed to demonstrate the highest power density to cost ratio.
As Nature Formed It: Venus Sculptures and the ‘Natural’ Waistline in Dress Reform Discourse
Authors: Franks Hallie M 
Published: August 2020

Abstract
In the second half of the nineteenth century, ancient sculptures of Venus became models for the ‘natural’ waistline. Drawings of the Venus de Medici or de Milo were popular in texts published by American dress reformers, who advocated for the rejection of corsets and tight-lacing. This article takes as its subject these drawings and their simultaneous signification of multiple bodies: a specific sculpture, an idealized form, the ‘natural’ form of any female torso, and the supposedly superior physicality of the ancient Greeks. It argues that the elision of these various bodies is facilitated by the treatment of ancient sculptures as ‘truth-to-nature’ representations — images that are simultaneously ideal and faithful to the form produced by nature. This understanding is encouraged by drawings of the statues, which imply the comparability of sculpture and body. In this way, the sculptures enter dress reform discourse, serving as both a faithful representative of a now-lost ancient body and a kind of visual lexicon by which living women might revive ancient aesthetic and moral perfection. As constructions of aspirational physical ideals, the sculptures and the drawings of Venus are enlisted in a developing and deeply charged visualization of white American womanhood.