bluuebunny/crossref_metadata_2025_split huggingface dataset:
Renewable energy in a dense urban fabric: solar gain estimation in the case of a turn of the century district
Authors: Sugár V , Fáczányi Zs 
Published: October 2022

Abstract
Buildings are responsible for significant amount of energy consumption. The new constructions already obliged to use decreased amount of energy, but the older buildings are ineffective compared to them. The new building energetic prescriptions in force since 2021 in Hungary require considerable share of renewable energy produced on-site. In case of a densely built urban fabric, the above renewable ratio can mostly be reached by using solar technologies. The author surveys the solar characteristics of a Budapest downtown area. Considerable ratio of the stock is residential, traditional apartment house type built around the turn of the 19th-20th century. The retrofit solutions and renewable power generation are restricted by the dense fabric and the heritage protection rules as well. In present paper the estimation of solar energy potential of the above characteristic building type is introduced. The European Union conform Hungarian calculations used system is used to define the values. The methodology contains 3D modelling and irradiation software simulation. As result, the connection between the footprint and irradiation data of the characteristic heritage buildings are introduced, as well as the solar power generation potential of the building type in question. Also, the heritage protection compatibility of the solar systems are studied.
Studying the potential microbial risk of construction cementitious materials in the urban environment
Authors: Hološová M , Eštoková A , Luptáková A 
Published: October 2022

Abstract
The presented work aimed at analysis of elements in the soil and cementitious materials from the selected locations to study the presence of various microorganisms on the surface of buildings. The methodology of the sampling was focused on the interface of the construction containing cement and the soil around the construction in foundation. The chemical analysis by performing X-ray fluorescence analysis confirmed leaching of the element cations of the clinkers. During the carrying out the investigation of the soil, the results additionally showed exceeded limited values of some of the metals elements in the soil which is considered as an environment burden. Moreover, in this research some of the cultivated microorganisms swabbed from the surfaces of the buildings from 14 selected locations are mentioned. These outputs gradually generate the image of the environmental conditions for cementitious materials of selected location in Košice.
Thermodynamic Aspects of Viscoelastic Materials’ Linear and Nonlinear Behavior
Authors: Minárová M , Tvrdá K 
Published: October 2022

Abstract
Materials that exhibit neither purely elastic nor purely viscous behavior, are dealt by viscoelasticity theory. Therein, each material is represented by a viscoelastic model. In this paper a viscoelastic exploration is dealt, focused to the quantification of energy acting during the load – response processes of viscoelastic material. In line with thermodynamic principles, nonnegativity of dissipated energy is supposed within the process, whereby the only reason of energy dissipation is the dashpot, i.e. the viscous member of viscoelastic matter present in the model. The assumption of potential energy storing by and only by the elastic member is taken into account at the same time. Each time we refer a model, the material matching with the model is meant. This work is a continuation, the enhancement of previous research of authors where particular investigations in this field were focused.
Natural vibration of a membrane hypar in a steel frame
Authors: Stulerova L , Kapolka L , Kmet S 
Published: October 2022

Abstract
This paper deals with a subject of a natural vibration. Modal analysis was performed on a simple membrane structure. Examined model is prepared in FEM software Dlubal. The membrane structure has geometry of a hyperbolic paraboloid or so called hypar. This membrane is basically a technical textile with no bending stiffness so therefore to carry different types of external loads it needs to be pre-stressed. This stress is provided by the edge ropes located in the sleeves around the circumference of the membrane. Stated construction is anchored by 2 anchor rods and 2 actuators to the steel frame which is supported with hinged sliding supports. Natural analysis with an add-on module RF DYNAM Pro was performed. The results of the natural frequencies and mode shapes are obtained which represents first phase of a complex dynamic analysis.
Nonvisual aspects of daylight in the built environment
Authors: Hraška Jozef 
Published: October 2022

Abstract
This paper investigates melanopic equivalent daylight vertical and horizontal illuminances within an indoor space as a metric for the nonvisual effects of its lighting. The article is based on the findings of photobiological research and the recommendations of several institutions for the threshold values of melanopic illuminance at the eyes of users of indoor spaces, which is sufficient for the proper functioning of the circadian system. This study uses a computer workplace as an environment to investigate experimentally the applicability of melanopic daylight metrics for the practical evaluation of the circadian potential of the indoor daylight environment. The article points out a number of problems associated with the practical evaluation of vertical melanopic daylight illuminance in a specific space. The paper also outlines practical guidelines for designing facades and color treatment of building surfaces in terms of their circadian potential.
Analysis of stress concentration at the edge of hole in plates with different widths by using FEM
Authors: Safaei B , Pezeshki Z , Kotrasova K , Kormanikova E 
Published: October 2022

Abstract
The aim of this work was to investigate the concentration of stress due to circular cut out in sheets under tensile loads. Geometrical changes and loading create stress concentration. Under this condition, stress has increased in the regions of geometrical changes and if its value exceeds yield stress, the material fails in these regions. In this work, the distribution of stress in sheets with circular cut out was numerically investigated to study stress concentration at the edge of hole and the obtained results were compared with analytical solutions. In addition, relationships among stress concentration factors and relative dimensions of hole were determined using the equations acquired from elasticity theory. It is worth mentioning that the obtained results proved the validity of numerical analysis of all parameters by ANSYS.
Benefits of BIM models and mixed reality in the implementation phase of construction projects
Authors: Čabala J , Kozlovská M , Struková Z , Tažíková A 
Published: October 2022

Abstract
The current trend based on the current needs of construction industry points to the increasing application of digital technologies in construction projects. Nowadays, digital technologies are becoming an essential part of construction in the phase of preparation and implementation of construction projects. Probably the greatest progress in the use of digital technologies is seen in the development of a virtual object data model of the building. The main advantages of this trend can be presented by the use of BIM technology, thus an information model of building, where other information attributes are assigned to the geometric model itself. The model created in this way has great information potential in the process of planning and preparation of construction, but also during its implementation. The technology of mixed reality (MR) has recently been added to the BIM technology, which significantly contributes to the expansion of workers' knowledge and at the same time has the potential to reveal the shortcomings that have arisen during the construction. The paper offers solutions of the possible use of BIM technology and mixed reality as tools to support the implementation of construction projects. These technologies were applied to the construction project Bastion Office Center in Košice - an administrative building.
Numerical simulations for time-dependent corrosion surface of unpainted structural steel plates using spatio-temporal data
Authors: Jiang F , Hirohata M 
Published: October 2022

AbstractStructural failure due to corrosion of steel members is a long-term process. A method to precisely simulate the development of corrosion on steel surfaces is of great significance. In this study, 9 specimens of unpainted steel plates, SM400A were used for the experiments. The experiments were conducted under artificial seawater corrosive environments to accelerate the corrosion process. The corrosion depth data of each unpainted steel plate for the spatial statistical analysis was measured by a laser focus measuring system when the accelerated corrosion experiments of 28, 84, and 168 days. Semivariogram was used in this spatial statistical analysis to research the spatial autocorrelation structures of the corrosion surface. By using this and the technique of ordinary kriging, the method to simulate the spatial features of corrosion surface was proposed. The results of the simulation indicated that the corrosion depth and surface topography of corrosion surfaces were highly consistent with the experiments. In addition, a prediction method for time-dependent corrosion surface was proposed by investigating the relationship between the spatial autocorrelation structures and their time-dependence data.
Finite amplitude electro-thermo convection in a cubic box
Authors: Peng Yu-xing , Liu Qiang , Li Zhong-xian , Wu Jian 
Published: October 2022

Abstract
Three-dimensional electro-thermo-hydrodynamic (ETHD) flows of dielectric fluids driven by simultaneous Coulomb and buoyancy forces in a cubic box is numerically studied. The set of coupled equations associated with the ETHD phenomena are solved with the finite volume method. The code is first validated by comparing the numerically obtained linear critical values of the pure electro-convection and thermal convection with the previous studies. Then the neutral stability curve of the system is given and the finite amplitude instability thresholds with different Rayleigh numbers (

Ra

) are presented. It is found that along the neutral stability curve, the flow strength becomes weaker with the increase of

Ra

and the decrease of electric Rayleigh number (T). Besides, the gap between the linear and nonlinear critical values expressed in terms of T decreases with the increase of

Ra

. Primarily, the distributions of charge density, temperature and velocity fields with different governing parameters near neutral stability curve are presented. The temperature and charge density profiles near the linear and nonlinear critical values are given, showing that higher T results in wider charge void region and shorter distance between the charge void region’s lower boundary and injection electrode. Finally, the symmetries of the flow patterns along the neutral stability curve are also discussed briefly.
Experimental observation of enhanced reverse saturable absorption in Bi
2
Se
3 nanoplates doped PMMA thin film
Authors: Mondal Partha , Choubey Priyanka , Gupta Anu , Wan Meher , Massoud Yehia 
Published: October 2022

Abstract
By employing the ultrafast Z-scan technique, we characterize the nonlinear absorption property of PMMA/Bismuth Selenide (Bi
2
Se
3) composite with varying concentrations. We report the fabrication of bismuth selenide (Bi
2
Se
3) nanoplate (topological insulator (TI)) doped poly methyl methacrylate (PMMA) thin film with varying doping concentrations. The effect of Bi
2
Se
3 on structural and linear properties of PMMA thin film has been investigated through UV-Vis spectroscopy, scanning electron microscope (SEM), and Energy dispersive x-ray spectroscopy (EDS) elemental mapping techniques. Furthermore, the nonlinear optical absorption property of PMMA and PMMA/Bi
2
Se
3 composites have been performed employing a single beam open aperture z-scan technique under femtosecond laser excitation at 750 nm. The z-scan results exhibit an enhancement of reverse saturable absorption (RSA) property with an increased nonlinear absorption coefficient (β) of the PMMA/Bi
2
Se
3 composites compared to pure PMMA measured with intensity at 320 GW cm−2. The RSA response gets enhanced with the increase in doping concentration also. Our experimental observations reveal that PMMA/Bi
2
Se
3 composite can provide a promising platform to realize photonic devices such as optical limiters, optical switches, and efficient protectors from high power sources.
Mechanical behaviors of a novel auxetic honeycomb characterized by re-entrant combined-wall hierarchical substructures
Authors: Zhou Yang , Pan Yi , Chen Lin , Gao Qiang , Sun Beibei 
Published: October 2022

Abstract
The current focus of the metamaterials is to further improve their performance by the unit cell innovation, while for the auxetic metamaterials, the compromise between the mechanical properties and auxetic effect still needs more efforts. Given this issue, here we developed a novel auxetic honeycomb, named re-entrant combined-wall (RCW) honeycomb, by introducing four hierarchical substructures to the RE cell. Analytical expressions were derived and used to study the in-plane elastic constants of the RCW honeycomb, which were well confirmed by the established finite element model. Further, we investigated its crushing behaviors under large deformation by the explicit numerical method, and the quasi-static crushing experiments were also carried out by the 3D-printed specimens. Results show that the properties of the proposed RCW honeycomb have a high degree of orthogonality and tunability. Compared with the traditional RE honeycomb, the Young’s modulus of the RCW honeycomb in the y direction increases by more than 120%, and the Poisson’s ratio decreases by about 43%. Besides, behaviors of the cell wall contact induced by the adding substructure can lead to an interesting stress enhancement phenomenon under large deformation, which significantly increases its crushing strength, up to 140%, compared with the RE honeycomb. Therefore, the results in this work effectively demonstrate the improved mechanical properties and auxetic performance of the proposed RCW honeycomb. Besides, the adopted design strategy of hierarchical substructure also exhibits great potential for developing novel and excellent auxetic mechanical metamaterials.
Study on layer formation behavior of Ag joints sintered with pressureless sintering process
Authors: Wang Liujue , Ding Taojie , Gu Lin , Sun Xiaodong 
Published: October 2022

Abstract
This study focuses on investigating the relationship between sintering performance and bond layer thickness for the hybrid Ag paste consisting of micrometer-sized Ag particles and sub-micrometer Ag spherical particles. The surface morphology showed that the sub-micrometer Ag particles would contribute to improving the densification and bonding strength of the sintered Ag joint. The x-ray results indicated that the bonding quality was achieved when the bonding layer thickness was 50 μm, whereas a thinner or thicker bonding layer would lead to cracks or voids. Moreover, the microstructure of sintered Ag joints with different bonding layer thicknesses was found to be in good agreement with the results of x-ray by SEM observations. There are many cracks in the sintering structure due to the insufficient Ag paste when the bonding layer thickness is below 50 μm, while more voids appeared in sintered Ag joints when the thickness reached 120 μm, which was caused by the organic solvent volatilization. In addition, the poor densifications lead to low strengths of 7.6 MPa and 23.42 MPa for 15 μm and 30 μm thickness, respectively. The shear test results revealed that the highest shear strength was achieved on the bonding layer with a 50 μm-thick bonding layer. However, the bonding strength would decrease to 24.67 MPa and 18.64 MPa when the bonding layer thickness was 90 μm and 120 μm, respectively. The SEM observations indicated that many dimples were formed on the fracture surface with a thickness of 50 μm, which was the reason for the enhancement of bonding strength in the sintered Ag joint.
Local electron correlation effects on the fermiology of the weak itinerant ferromagnet ZrZn2
Authors: Chen Wenhan , James A D N , Dugdale S B 
Published: October 2022

Abstract
The Fermi surface topology plays an important role in the macroscopic properties of metals. It can be particularly sensitive to electron correlation, which appears to be especially significant for the weak itinerant ferromagnet ZrZn2. Here, we look at the differences in the predicted Fermi surface sheets of this metallic compound in its paramagnetic phase for both density functional theory (DFT) and the combination of DFT with dynamical mean field theory (DFT + DMFT). The theoretical spectral functions evaluated at the Fermi level were used along with calculations of the electron–positron momentum density (also known as the two-photon momentum density) in k-space to provide insights into the origin of certain features of the Fermi surface topology. We compare this two photon momentum density to that extracted from the positron annihilation experimental data (2004 Phys. Rev. Lett.
92 107003). The DFT + DMFT densities are in better agreement with the experiment than the DFT, particularly with regard to the flat bands around the L and W high symmetry points. The experimental neck around L, which relates to a van Hove singularity, is present in DFT + DMFT but not in the DFT. We find that these flat bands, and as such the Fermi surface topology, are sensitive to the many body electron correlation description, and show that the positron annihilation technique is able to probe this. This description is significant for the observed behavior such as the Lifshiftz transition around the quantum critical point.
An experimental investigation of Quench Polish Quench (QPQ) coating on AISI 4150 steel
Authors: Boopathi Sampath 
Published: October 2022

Abstract
In this research, the hardness, layer thickness, and corrosion rate of the nitro-carburizing coating on AISI 4150 steel using the Quench-Polish-Quench (QPQ) process have been investigated. Nitro-carburizing temperature (T), nitro-carburizing time (tc), and oxidation time (to) are considered coating parameters. The experiments were designed and analyzed to investigate the effects of coating parameters on responses by the Taguchi method. A 590 °C temperature of the nitro-carburizing solution and a 145 min duration of both the nitro-carburizing and oxidizing processes have been predicted to obtain the maximum micro-hardness (504.71 HV) and coating-layer thickness (13.60 μm). A 570 °C temperature of the nitro-carburizing solution with the same process time is predicted to obtain the lowest corrosion rate (1.27 mm/miles). The optimum parameters set are used to perform Scanning electron microscopy (SEM), x-ray diffraction (XRD), and Energy-Dispersive x-ray Spectroscopy (EDS) analyses.
Influence of cut-out shape on the dynamic behavior of carbon nanotubes reinforced functionally graded plates
Authors: Kumar Manish , Sarangi Saroj Kumar 
Published: October 2022

Abstract
This research investigates the effects of cut-out on the dynamic behaviour of functionally graded carbon nanotube reinforced composite (FGCNTRC) plates. Finite element method (FEM) is utilized and SHELL181 type element of the ANSYS Workbench 17.2 program is utilized. To understand the vibration characteristics of the FG plates, various shapes of cut-outs such as triangular, square, rectangular, hexagonal, circular etc are considered. For comparison, solid FGCNTRC plate is modeled and natural frequencies of plates integrated with cut-outs of different shapes are determined using free vibration study. The mode superposition method is used to address the harmonic response analysis problem keeping the damping ratio constant. The stress, phase changes and displacement responses for definite frequency ranges have been used to interpret the findings. To learn more about the effects of cut-outs on the dynamic response, the plates are designed considering various grading patterns. The findings show that the shape of cut-outs significantly affects the harmonic responses as well as the fundamental frequency of the FG plates and are also depending on the grading patterns of these plates.
Trinomials, torus knots and chains
Authors: Barrera Waldemar , Magaña Julio , Navarrete Juan 
Published: October 2022

Letn>mn>mbe fixed positive coprime integers. Forv>0v>0, we give a topological description of the setΛ(v)\Lambda (v), consisting of points[x:y:z][x:y:z]in the complex projective plane for which the equationxζn+yζm+z=0x\zeta ^n +y \zeta ^m+z=0has a root with normvv. It is shown that the setΩ(v)=PC2∖Λ(v)\Omega (v)= {\mathbb P_{\mathbb C}} ^2 \setminus \Lambda (v)hasn+1n+1components. Moreover, the topological type of each component is given. The same results hold forΛ\LambdaandΩ=PC2∖Λ\Omega ={\mathbb P_{\mathbb C}}^2 \setminus \Lambda, whereΛ\Lambdadenotes the set obtained as the union of all the complex tangent lines to the33-sphere at the points of the torus knot, that is, the knot obtained by intersecting{[x:y:1]∈PC2:|x|2+|y|2=1}\{[x:y:1] \in \mathbb {P}_{\mathbb C}^2 : |x|^2+|y|^2=1\}and the complex curve{[x:y:1]∈PC2:ym=xn}\{[x:y:1] \in {\mathbb P_{\mathbb C}} ^2 : y^m=x^n\}. Finally, we use the linking number of a distinguished family of circles and the torus knot to give a numerical invariant which determines the components ofΩ\Omegain a unique way.
“None of You Have Read It?”: Membership Categorization among Adult MLLs in Collaborative Writing Tasks
Authors: Bergstrom Tait 
Published: October 2022

AbstractCollaborative writing tasks are common in multilingual university-level writing-intensive classes, but how multilingual language learners (MLLs) are socialized into this group work as a discursive practice is still poorly understood. This case study of adult MLLs in multilingual writing classes at a large public university provides insight into how this socialization can conflict with teaching goals. Membership Categorization Analysis (MCA), a micro-analytic approach, is used to investigate how students inter-subjectively assemble categories of identity in order to articulate their understanding of collaborative writing tasks and how they are obligated to negotiate them. Analysis of classroom talk reveals a conflict between student articulations of how to perform writing tasks when they interact with one another as group members and when they interact individually with instructors. Implications and a possible pedagogical intervention for the framing of collaborative writing tasks are discussed.