bluuebunny/crossref_metadata_2025_split huggingface dataset:
Comparative study of cell growth and cellular adhesion on Ti-6Al-4V surfaces made by Selective Laser Melting followed by different surface post processing steps
Authors: Adelmann Benedikt , Abb Melanie , Hellmann Ralf 
Published: December 2021

Abstract
Selective laser melting is generally considered as to improve the design of medical implants, thus supporting medical treatment and maintaining mobility of invalid and older people. In particular, medical grade titanium alloys are in favour for spinal implants, as being nowadays manufactured by, e.g., milling. Selective laser melting offers the advantage of an adapted elasticity as to avoid stress shielding within the backbone by including complex lattice structures inside the individualized implant. For the integration into the backbone, surface properties, particularly surface roughness, are crucial with respect to biocompatibility and cell growth. Opposite to conventional milling, selective laser melting, however, results in an inferior surface roughness, leading to the necessity of downstream process steps.
We report on cell growth and cellular adhesion of human primary fibroblasts on medical grade Ti-6Al-4V fabricated by selective laser melting followed by combinations of milling, hot isostatic pressing, chemical surface treatment and steam-sterilization to generate different surface conditions for cell growth. For example, cell growth is studied for varying milling path spacing on SLM parts exhibiting different surface roughness. Our results reveal good cell growth for milling path spacing lower than 0.18 mm as compared to higher milling path spacing and not milled surfaces. Cell fluorescence images and SEM images show that the cell growth is additionally hampered by the edges of the milling path. Conveniently, process failures such as pores originating from the selective laser melting process do not hamper the cell growth.
World Multidisciplinary Civil Engineering-Architecture-Urban Planning Symposium - WMCAUS 2021
Authors: Yilmaz Isik , Marschalko Marian , Drusa Marian 
Published: December 2021

The current “IOP Conference Series: Material Science and Engineering” volume includes papers presented in the capital city of the Czech Republic, Prague for the 6th Anniversary of the “World Multidisciplinary Civil Engineering-Architecture-Urban Planning Symposium” from 30 August to 3 September 2021. The purpose of the WMCAUS 2021 is to give a place to converse and consider the current data, discoveries, and mechanics in various areas of Civil Engineering, Architecture, and Urban Planning, to provide favourable circumstances for forthcoming cooperation. It is a stage for contributing information and skills in the areas of Civil Engineering, Architecture, and Urban Planning by arranging a conference for researchers at the beginning of their career and letting them present their findings, and leave them space to discuss it with for the presentation of their work and discussion of their ideas with specialists in diverse fields of Civil Engineering, Architecture, and City and Urban Planning.
The designed period for WMCAUS 2021 was from the 14th of June till the 18th of June 2021. Nevertheless, it was deferred to 30 August till 3 September 2021 due to the Covid-19 pandemic and therefore was held in Prague in person to match participants' needs.
All the missions of the World Multidisciplinary Civil Engineering-Architecture-Urban Planning Symposium – WMCAUS 2021 were achieved, and 285 peer-reviewed articles were published. The team of the WMCAUS would like to give thanks to all reviewers for their great work and for the high quality of articles that were published.
List of Editors of WMCAUS 2021, Committee WMCAUS 2021 are available in this pdf.
Minimization of a point thermal bridge by a roof restraint system holder
Authors: Šubrt Roman , Charvátová Pavlína 
Published: December 2021

Abstract
Roof restraint systems are designed for flat roofs for safe maintenance and repairs. By anchoring them, considerable point thermal bridges are created, which can also lead to condensation in the roof cladding. We deal in this work with the design of minimization of these point thermal bridges.
Restorations in Chile in the Mid-Twentieth Century: The National Monuments Council and Some of the First Architectural Heritage Interventions
Authors: Baeriswyl María Victoria Correa 
Published: December 2021

Abstract
This paper presents the initial results of an ongoing historical research project that addresses some of the first architectural restoration interventions led by the Chilean State through the National Monuments Council, the institution responsible for management of the country’s cultural heritage. The National Monuments Council was created in 1925 by Decree-Law No. 651, the first long-standing legal provision to cover this aspect of cultural heritage. It remained in place for several decades before being superseded in 1970 by the current National Monuments Law (No. 17,288). The State’s first steps in regard to architectural restoration were made possible by this legislation, and by the mid-twentieth century, the National Monuments Council was working systematically to register, analyse and take action to restore the country’s architectural heritage. In 1949, a Conservation Commission was formed as part of the Council, and this body played a key role in the promotion of restoration projects at the time. The National Monuments Council worked in partnership with the General Directorate of Public Works, and efforts on the part of the two public institutions resulted in the creation of an annual budget for architectural restoration. By the 1950s, numerous buildings and sites considered relevant to the national identity were being restored, and efforts were made to emphasise their cultural significance and value. These early interventions were some of the first of their type to be funded by the State and were fundamental to the local architectural historical context. Work focused primarily on religious and military colonial buildings, including churches, chapels and fortresses located the length of Chile. Archival material from the time, such as National Monuments Council session minutes and institutional bulletins drafted under Decree-Law No. 651, provide a record of these early interventions. Analysis of these sources from a technical and theoretical perspective provides insights into the motivations and selection criteria used to establish an order of priority for the restoration of buildings and sites. This paper presents the main actions taken at a time when architectural restoration was first being promoted by the Chilean State and explores how these provided the foundations upon which future development of the local discipline would occur.
Optimisation of Polymer Addition Using the Plackett-Burman Experiment Plan
Authors: Mazurek Grzegorz , Podsiadło Marcin 
Published: December 2021

Abstract
At the present time, the utilization of waste polymer materials belongs to one of the most important challenges where global economies have to tackle. This article concerned the modification of petroleum road bitumen with waste polymer. The bitumen modification process with the use of polymeric materials was carried out considering a number of other quantitative factors, such as: mixing time, mixing speed, bitumen temperature and qualitative factors such as: waste polymer content, type of grain size, type of neat bitumen and type of waste polymer. Two kinds of waste polymers (PET, PP) were used in the research, which served as a modifier. Two petroleum bitumens were used: 20/30 (hard) and 70/100 (soft). Based on the divalent Plackett-Burman experiment plan, the number of variables and the number of combinations of mixtures were determined, which were required to determine the final response surface model. The following features were tested as the output variables: penetration, softening point, Fraass breaking point, dynamic viscosity 60oC, 90oC, 135oC, deformation energy and maximum elongation. The use of the experimental design methodology allowed to identify the factors that had the greatest impact on the bitumen modification process. The assessment of the significance of the parameters also allowed to identify a significant model allowing to find the optimal bitumen and waste polymer composition. Based on the test results, it was shown that the consistency of the modified bitumen was influenced by the type of bitumen, its amount, mixing speed and mixing time. With regard to the softening point, the type of polymer was also an important factor. Ultimately, the optimization process allowed for the determination of such a combination of both qualitative and quantitative input factors, which resulted in bitumen showing higher utility than input 20/30 and 70/100 bitumens. Moreover, it was found that the increase in mixing time did not result in an excessive increase in bitumen stiffness caused by the mixing process. Thus, the low-temperature properties left unchanged significantly
Analysis of the Impact of Redispersible Polymer Powder on the Water and Frost Resistance of Cold-Recycled Mixture with Bitumen Emulsion
Authors: Krasowski Jakub , Iwański Marek , Buczyński Przemysław 
Published: December 2021

Abstract
The subject of the research presented in the article is the assessment of the effect of redispersible polymer powder (RPP) on water and frost resistance of a cold-recycled mixture with bitumen emulsion (BE-CRM). The article presents the results of research on the influence of polymer powder EVA based on polymer (polyethylene-co-vinyl acetate) on the properties of BE-RCM. The impact analysis was determined using the assumptions of the Box-Behnken experiment plan in which three components are controlled. In this case, the variables were the content of: polymer, cement and asphalt emulsion. All ingredients were dosed with a step of 1.5% of the percentage share in the mixture composition. Polymer and Portland cement in an amount of 0.5% to 3.5%. On the other hand, the pure asphalt originating from the asphalt emulsion was 0.0%, 1.5% and 3.0%, respectively. The scope of the tests included the determination of: mixture density, void content (Vm), water absorption (nw), intermediate tensile strength (ITS), to water (TSR) as well as water and frost according to AASHTO T283.
Influence of shear on plastic bending strength of I cross-sections steel beams
Authors: Juhás Pavol , Šenitková Ingrid Juhásová 
Published: December 2021

Abstract
In general, steel beams are stressed by bending and shear. Due to the loading a normal stresses σ and shear stresses τ arise in individual cross-sections of steel beams. But they are usually stressed mainly by bending. This follows both from several theoretical analyzes and especially from the corresponding experiments. Therefore, current standards for the design of steel structures allow the impact of shear to be neglected to a certain level of shear stress of the most stressed - decisive cross-sections of beams (EN 1993-1-1, respectively CSN EN 1993-1-1 and others). However, in the case of shorter beams, especially in places of support and in places of application of concentrated forces, the shear effects of the load can also be significant. In the case of more significant shear effects of the load, the plastic flexural strength of the decisive cross-sections and also the overall load-bearing capacity of the steel beams must be adequately reduced. However, the degree of flexural strength reduction with a significant effect of shear in the case of I cross-sections is still unambiguous. It is therefore important to experimentally investigate steel beams in the area of significant shear effects. The presented article contains selected results of experimental investigation of the significant effect of shear on the flexural strength of steel beams I cross-sections.
Articulation of Facade Graphics and Techniques of its Implementation
Authors: Lipowicz-Budzyńska Alina 
Published: December 2021

Abstract
The article deals with issues at the boundary of architecture and technology, related to visual articulation. The facade graphics is a relatively new phenomenon that has arisen over the last two decades. Some of the image implementation techniques it uses have been known for a long time. Some of them are derived from stained glass (e.g. the technique of manual enamel application), some are related to the already known techniques of workshop graphics (screen printing). One of the latest technological achievements is the development of digital printing technology. Each of the aforementioned techniques has specific artistic possibilities and means of expression, which influences the articulation of the image in the external partition and has a significant impact on a number of compositional aspects. The image placed in the façade supports the building's form, underlining its shape, emphasizing important places in the building. The work examines the relationship between the applied techniques of implementation and the properties of the image on glass. An important part is to determine to what extent the construction of the image and the applied plastic measures affect the visual range of the glass partition and the functional properties. Particularly interesting projects are those made with several techniques, and those in which a new technique was discovered, which is later copied in other projects. The research can make a strong case for using artistic glass in the facade of a building and provide guidance for designers and investors. The publication will present examples of implementations placed in the facade of the building. The phenomenon will be investigated on the basis of buildings constructed over the last two decades. Due to the global nature of plastic phenomena, there is no limited research territory.
Innovative programming product for work architect-urbanist with Big Data of city
Authors: Fomenko Oksana , Danylov Serhiy , Izbash Mykhaylo , Izbash Andrii 
Published: December 2021

Abstract
The article substantiates the necessity of creating an innovative programming product "Program complex for modelling the city as a dynamic system". The methodological basics of writing a technical task as the basis for the complex development are described. The aspects of its use as a tool for information support of strategic decision-making processes related to the transition of the city to an intensive type of development are disclosed. The purpose of the program complex: information support for strategic decision-making processes to optimize the principles of the city. The purpose of the program complex is to analyze the processes of city functioning as a complex dynamic system. In this case, it is possible to diagnose the current state of the city as a system in real-time, the state of its subsystems and elements, as well as to predict changes in the dynamic processes of their functioning. The specified program package is based on a combination of two trends in modern science: optimization of the city functioning processes and management of large arrays of city data (Big Data). The Program simulates positive and negative dynamics of the transition of the city, its subsystems and individual elements from a state of stability to crisis and a possible pre-catastrophic state.
Structural bracing of wooden roofs under the extreme winds
Authors: Dutkiewicz Maciej , Hajyalikhani Poorya , Lamparski Tomasz , Whitman Lane , Covarrubias Joshua 
Published: December 2021

Abstract
An essential element of every building is a roof that protects it against the influence of weather conditions - rainfall, wind, and temperature changes. The shape of the roof, the type of roof covering, and the slope of the roof have the greatest impact on the type and material solutions. The roof structures are made of wooden, steel, or reinforced concrete. Especially in single-family residential buildings, wooden roof structures are most often used. Wood is perceived by many as the oldest and best building material, valued for its low weight, good strength, elasticity, and high thermal and insulation values. Traditional roof has been used over the centuries. The more common roof in wood framing roof is gable and hip roof which is consist of rafter, ridge, hip, collar tie and joist. The common slop for hip roof is 3/12 to 12/12. By increasing the slop, the length of the hip element in roof increases and needs to brace closely. The aim of the study is to analyse the location of roof braces in hip roof structures, due to the ultimate and serviceability limit states, under dead, live and wind loads based on finite element method model. Two wind speeds of 22 m/s and 40 m/s is taken into consideration. Elements with the different spans, cross-sections and slope of the roof are analysed.
Modern Architecture of School Buildings in Poland. Selected Design Issues on The Example of Two School Buildings Built in the 21st Century
Authors: Skowronek Weronika , Winnicka-Jasłowska Dorota 
Published: December 2021

Abstract
This article concerns the design and architecture of educational facilities in Poland. It presents selected architectural and spatial solutions for modern primary school buildings. The article is based on a juxtaposition of two school buildings built in the second decade of the 21st century, located in the central and southern part of the country. Contemporary buildings were selected to draw attention to the changing approach to design and the development of architecture dedicated to the youngest recipients, emphasizing important aspects of the school space in the era of growing demands and social awareness. The analysis of the buildings indicated in the article was carried out on the basis of the available literature on the subject, comparison with typical buildings in Poland, and in situ research in school buildings, with an emphasis on the key aspects of the functional and spatial arrangement in the presented facilities, determining the target educational space for students. A school building in Poland, in the minds of many architecture recipients, is associated with a typical building, such as 'millennial schools', created as part of the campaign to build a thousand schools - monuments related to the celebration of the Millennium of the Polish State. The typification period, abounding in many buildings that still function to this day, lasted almost twenty years until 1981, when the standard for typical schools was repealed. At that time, the search for the perfect form of the building as well as flexible and functional school spaces, tailored to the scale of the youngest recipients, began. The classroom, which used to be the only condition for the functioning of the school, turned out to be insufficient. Modern projects have started to be implemented, which systematically contribute to the creation of a new image of the school as a friendly and modern institution, maintained in an optimal and holistic development-oriented educational environment.
Comparison of Masonry Homogenization Methods – Macromodelling and Micromodeling of Walls Behaviour Made of Autoclaved Aerated Concrete Masonry Units
Authors: Jasiński Radosław , Grzyb Krzysztof 
Published: December 2021

Abstract
The adopted method of empirical homogenization strictly determines the degree of faithful reproduction of the masonry structure's work in terms of the analysis of cracking forces, destructive forces, and the mechanism of structure destruction. The high level of detail of the numerical model may make it impossible to perform calculations and predict internal forces for larger structures or entire buildings. The study aims to compare two different masonry homogenization techniques and determine the advantages and disadvantages of the adopted methods. The concept of a micromodel, in which the contact of two materials - a masonry unit and a mortar, was simulated using contact elements in the interface planes and a macromodel in which the wall was modelled as a homogeneous, isotropic material, omitting contact surfaces. The analysis subjects were standard wall models made of autoclaved aerated concrete (AAC) masonry units in axial and diagonal compression tests. In the numerical calculations, the elasto-plastic model with degradation implemented. The Menetrey William boundary surface describes the compression phase, and the Rankine criterion determines the tensile phase. In the axially compressed walls, the relations of forces and vertical and horizontal deformations compared, and in the shear walls, the forces and values of strain angles analyzed. In both models, the mechanisms of wall destruction and scratching were considered. The initial parameters of the elasto-plastic model derived from the results of wall tests using various model validation techniques. The calibration coefficient was used in the micromodel, determined as the quotient of the wall's compressive strength and masonry unit's compressive strength. The fracture energy value was also corrected. In the macromodel, the masonry's modulus of elasticity and the tensile strength value calibrated. Calculations based on the micromodel were consistent with the test results at the relative error level of 2%. The observed damage and scratches to the walls after the tests were consistent with the numerical projection. The macromodel calculations showed the convergence of the results in scratch morphology, scratching and destructive forces. The most significant differences occurred in shear deformations. The macromodelling approach allowed for capturing the wall's global tendency to deteriorate without opening the contact surfaces locally (cohesive cracks), as is the case during the tests.
Heat Recovery Ventilation Systems and their Physical Quantification
Authors: Bielek Boris , Szabó Daniel , Klem Josip , Grolmus Roman 
Published: December 2021

Abstract
The essence of ventilation is the exchange of air in the room for fresh outside air. At the same time ventilation is a factor that can significantly affect the energy efficiency of a building. Hygienic requirements for ventilation of interiors of buildings in the context of increasing the energy efficiency of buildings lead to the transformation of unregulated ventilation by infiltration to regulated ventilation systems with heat recovery. The regulated ventilation system makes it possible to optimize the ventilation intensity on the basis of a stimulus from the room user or automatically on the basis of sensors monitoring the quality of the indoor climate (temperature and relative humidity, CO2 concentration in the air, etc.). In addition, if we use a ventilation system with heat recovery from the exhaust air to preheat the fresh supply air to the room, we can achieve high energy efficiency of the building by meeting the hygienic criteria of the indoor climate. The article describes heat recovery ventilation systems and their basic conceptual solutions applied in the modern architecture. The heat exchange between the hot exhaust air and the cold supply air in the winter takes place in heat recovery ventilation units in the heat exchanger. The efficiency of heat recovery defines how much heat we can transfer from the exhaust air to the fresh air in the heat recovery exchanger. The article analyses individual factors influencing the efficiency of heat recovery. Due to the fact that the manufacturers of heat recovery ventilation units declare in their brochures or websites the values of the maximum efficiencies of their products, we were interested in their real efficiencies under normal operating conditions. Therefore, we subjected to experimental research in a large climate chamber a product from the German manufacturer Lunos, namely a specific type of decentralized heat recovery unit Lunos Nexxt E. The article describes the methodology of laboratory experiment, used experimental basis, brings and analyses measurement results and calculates real efficiency of the subject heat recovery in accordance with STN EN 13 141. In the end it compares measured values with the values from the manufacturer.