Selected Papers from CEES 2021, the first International Conference on Construction, Energy, Environment and Sustainability (Coimbra, 2021), on the topic of Sustainable Construction Materials and Technologies

A special issue of Infrastructures (ISSN 2412-3811).

Deadline for manuscript submissions: closed (1 May 2022) | Viewed by 37606

Special Issue Editor


E-Mail Website
Guest Editor
Itecons – Institute for Research and Technological Development in Construction, Energy, Environment and Sustainability, Pedro Hispano s/n Avenue, 3030-289 Coimbra, Portugal
Interests: structural engineering; earthquake engineering; dynamic analyses; design for steel structures; design for RC structures; numerical solutions

Special Issue Information

Dear Colleagues,

This Special Issue is related to the first International Conference on Construction, Energy, Environment and Sustainability (CEES 2021) which is taking place in Coimbra, Portugal, from 12 to 15 October 2021, and is being organized by Itecons, University of Coimbra (UC) in collaboration with Instituto Superior Técnico, University of Lisbon (IST).

From the extraction of resources to the production and transport of materials to the construction process, the construction industry is responsible for a great deal of carbon emissions, as is the usage of buildings and manmade infrastructures. This has motivated the search for alternatives to conventional materials and the need for innovation in materials production and performance, as well as for the development of novel building systems and construction technologies that reduce environmental impacts associated both with new and existing construction. Furthermore, as most industries continue to rapidly modernise and adopt new technologies, the construction industry transformation through digitisation is becoming inevitable. As we transition into Construction 4.0, multidisciplinary researchers must come together to work on using new technologies to benefit construction efficiency in alignment with stricter environmental requirements.

Please note, registration for CEES 2021 is obligatory for acceptance.

In this Special Issue we are looking for high quality original research papers related to the following topics:

  • Construction quality control systems
  • Construction management
  • Construction industry challenges
  • Prefabrication
  • Virtual design and construction
  • Building Information Modelling (BIM)
  • Automation in construction
  • Smart buildings
  • Digital information
  • IoT/AI in the construction industry
  • Sustainability and risk assessment
  • Construction 4.0
  • Rehabilitation, retrofitting and refurbishment and conservation heritage
  • Other topics related to sustainable infrastructures and sustainable construction processes

Dr. Enrico Zacchei
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Infrastructures is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 1800 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • sustainable construction technologies
  • sustainable infrastructures
  • construction 4.0
  • automation in construction
  • digitization in construction

Published Papers (12 papers)

Order results
Result details
Select all
Export citation of selected articles as:

Research

14 pages, 4051 KiB  
Article
Analysis of the Optical Response of Opaque Urban Envelope Materials: The Case of Madrid
by Gloria Pérez, Fernando Martín-Consuegra, Fernando de Frutos, Arturo Martínez, Ignacio Oteiza, Borja Frutos and Carmen Alonso
Infrastructures 2022, 7(9), 116; https://0-doi-org.brum.beds.ac.uk/10.3390/infrastructures7090116 - 02 Sep 2022
Viewed by 1509
Abstract
The optical response of opaque materials in an urban envelope plays an important role in a city’s energy exchange with the environment as it defines the absorption of radiation and emission of heat. In the present work, the most common surfaces of the [...] Read more.
The optical response of opaque materials in an urban envelope plays an important role in a city’s energy exchange with the environment as it defines the absorption of radiation and emission of heat. In the present work, the most common surfaces of the finishing materials of pavement and walls in the city of Madrid (Spain) were identified, and their reflectance was measured in situ to determine their solar absorptance and color coordinates. Most of the selected pavement showed a relatively high solar absorptance in the range of 0.87 to 0.60, while in vertical surfaces, the range was 0.85 to 0.29. The variations of the color coordinates obtained for pavement were 27.1, 11.4, and 6.7 for ΔL*, Δa*, and Δb*, respectively. Significantly higher values were obtained in the case of vertical surfaces (47.5, 20.5, and 23.6, respectively). The results were included into a database intended to be the seed for a catalogue of the experimental thermo-optical properties of opaque envelope materials in Madrid. The catalogue will be useful for the analysis of the stimuli generated by the urban environment for citizens and for achieving more reliable results from energy simulation tools in the search for strategies to improve urban comfort and sustainability. Full article
Show Figures

Figure 1

9 pages, 1666 KiB  
Article
Improved Cementitious Tile Adhesives’ Workability and Mechanical Performance with the Use of Recycled Materials
by Ana Lourenço, Luís Silva, Vera Fernandes and Pedro Sequeira
Infrastructures 2022, 7(9), 111; https://0-doi-org.brum.beds.ac.uk/10.3390/infrastructures7090111 - 26 Aug 2022
Cited by 1 | Viewed by 2090
Abstract
The impact that construction has on sustainability as a relevant consumer of materials is well known, especially with regard to cement, which contributes to high CO2 emissions. It is well known that in tile adhesives, cement add positive technical contributes, supporting tensile [...] Read more.
The impact that construction has on sustainability as a relevant consumer of materials is well known, especially with regard to cement, which contributes to high CO2 emissions. It is well known that in tile adhesives, cement add positive technical contributes, supporting tensile adhesion, especially after water immersion and freeze–thaw cycles. On the other hand, it is also known that that it is possible to replace Portland cement with alternative sources, such as blast furnace slag, fly and bottom ashes, or other pozzolanic materials. Even so, other materials can be also used to contribute to additional performance. This work intends to prove that using recycled materials or by-products is not just a potential way to replace existing materials, improving environmental sustainability, but also contributes additional value to mortars, such as cement-based tile adhesives. Different recycled waste materials are introduced to a cement-based tile adhesive and the evaluation of properties according to EN 12004 is conducted. The results show how the introduction of recycled rubber can contribute to improve the workability of a tile adhesive, acting as a lightweight aggregate. Moreover, it can contribute to reducing the dynamic elasticity modulus; thus, it has a potential contribution to reduce global tensions in tiling systems, and the adhesion results are maintained by the introduction of slag, another recycled material. The weight reduction reduces mortar consumption, one of the main targets to support indicated strategy and justify a more sustainable performance. The results indicate that the introduction of rubber and slag provide good technical and mechanical performance for the mortars, as well as excellent workability. Full article
Show Figures

Figure 1

22 pages, 10469 KiB  
Article
The Use of Envi-Met for the Assessment of Nature-Based Solutions’ Potential Benefits in Industrial Parks—A Case Study of Argales Industrial Park (Valladolid, Spain)
by Felipe Macedo Alves, Artur Gonçalves and M. Rosario del Caz-Enjuto
Infrastructures 2022, 7(6), 85; https://0-doi-org.brum.beds.ac.uk/10.3390/infrastructures7060085 - 16 Jun 2022
Cited by 13 | Viewed by 3849
Abstract
Urbanization causes major changes in environmental systems, including those related with radiation balances and other meteorological conditions because of changes in surfaces and the physical environment. In addition, cities generate specific microclimates as a consequence of the diverse conditions within the urban fabric. [...] Read more.
Urbanization causes major changes in environmental systems, including those related with radiation balances and other meteorological conditions because of changes in surfaces and the physical environment. In addition, cities generate specific microclimates as a consequence of the diverse conditions within the urban fabric. Industrial parks represent vast urban areas, often neglected, contributing to the degradation of the urban environment, including poor thermal comfort as a result of soil sealing and low albedo surfaces. Nature-Based Solutions (NBS) can promote the mitigation of the anthropic effects of urbanization using nature as an inspiration. The present study, aimed at estimating the microclimate conditions in a fraction of the Argales industrial park in the city of Valladolid (Spain), with the use of the ENVI-Met software, assesses the current situation and a planned NBS scenario. Base scenario simulation results demonstrate different conditions across the simulations, with higher temperatures on sun-exposed surfaces with low albedo, and lower temperature spots, mostly associated with shadowed areas near existent buildings. After the simulation of the NBS scenario, the results show that, when compared with the base scenario, the projected air temperature changes reach reductions of up to 4.30 °C for the locations where changes are projected from impervious low albedo surfaces to shaded areas in the vicinity of trees and a water body. Full article
Show Figures

Figure 1

13 pages, 1668 KiB  
Article
Direct Method to Design Solar Photovoltaics to Reduce Energy Consumption of Aeration Tanks in Wastewater Treatment Plants
by Enrico Zacchei and Antonio Colacicco
Infrastructures 2022, 7(6), 79; https://0-doi-org.brum.beds.ac.uk/10.3390/infrastructures7060079 - 06 Jun 2022
Cited by 2 | Viewed by 2108
Abstract
Photovoltaic (PV) energy systems are considered good renewable energy technologies due to their high production of clean energy. This paper combines a PV system with wastewater treatment plants (WWTPs), which are usually designed separately. For this, a recent methodology was adopted, which provides [...] Read more.
Photovoltaic (PV) energy systems are considered good renewable energy technologies due to their high production of clean energy. This paper combines a PV system with wastewater treatment plants (WWTPs), which are usually designed separately. For this, a recent methodology was adopted, which provides direct steps to estimate the peak powers of PV plants (PVPs) by using the airflow of blowers. The goal was to reduce the energy consumption of aeration tanks in WWTPs. Analytical equations and parameters based on the air temperature, solar irradiation, biological kinetic, dissolved oxygen, and mechanical oxygenation are adopted. The key parameter in this methodology is the air temperature variation that represents an approximated temperature in the WWTP’s oxidation tanks. It is shown, through the analysis of small WWTPs, that since the temperature changes for each season, there is a peak in the function of the quantity of oxidation, which is high in the summer season. Further, the curve trends of temperature for WWRPs are similar to PVPs. Therefore, it could be possible to design the PV system with the WWTPs well. The results show that the air temperature curves increase in a directly proportional way with the consumption of energy from oxidation blowers; this could induce a more conservative PVP design. Furthermore, the results show that the mean trend of the energy consumption of the analyzed aeration systems reaches about 8.0% at a temperature of 20–25 °C, covering a good part of the oxidation tank consumption. Full article
Show Figures

Figure 1

11 pages, 1918 KiB  
Article
Transcalar Design: An Approach to Biodesign in the Built Environment
by Ana Goidea, Dimitrios Floudas and David Andréen
Infrastructures 2022, 7(4), 50; https://0-doi-org.brum.beds.ac.uk/10.3390/infrastructures7040050 - 01 Apr 2022
Cited by 5 | Viewed by 3382
Abstract
Biodesign holds the potential for radically increasing the sustainability of the built environment and our material culture but comes with new challenges. One of these is the bridging of the vast differences of scale between microbiological processes and architecture. We propose that a [...] Read more.
Biodesign holds the potential for radically increasing the sustainability of the built environment and our material culture but comes with new challenges. One of these is the bridging of the vast differences of scale between microbiological processes and architecture. We propose that a transcalar design approach, which weaves together nonlinear dependencies using computational design tools and design methodologies through the biological generation of architectural components, is a way towards successful design implementations. Such design processes were explored in a laboratory-based fabrication and study of a column element. This column, named Protomycokion, serves to illustrate how design methodologies, particularly through the use of a demonstrator artefact, can serve to navigate the multiple scales, disciplines, and experiments that are necessary to engage the complexities of biodesign. Transcalar design processes embrace the adaptability, variability and interdependence of biological organisms and show possible gains with regard to material sustainability and increased performativity. Full article
Show Figures

Figure 1

16 pages, 9645 KiB  
Article
Impact of the Height of Buildings on the Maintainability of Natural Stone Claddings
by Cláudia Ferreira, Ana Silva and Jorge de Brito
Infrastructures 2022, 7(3), 44; https://0-doi-org.brum.beds.ac.uk/10.3390/infrastructures7030044 - 18 Mar 2022
Cited by 1 | Viewed by 1794
Abstract
The buildings’ surroundings’ environmental exposure conditions (e.g., orientation, location, altitude, distance from the sea, temperature, precipitation, presence of damp, exposure to prevailing winds, among others) have a considerable influence on the performance and durability of their envelope. Furthermore, the intensity of these conditions [...] Read more.
The buildings’ surroundings’ environmental exposure conditions (e.g., orientation, location, altitude, distance from the sea, temperature, precipitation, presence of damp, exposure to prevailing winds, among others) have a considerable influence on the performance and durability of their envelope. Furthermore, the intensity of these conditions can vary significantly with the height of the building and, consequently, influence the degradation of different parts of the same building in different ways. In a tall building, the upper part is more prone to higher solar radiation levels, temperature variations, and exposure to wind–rain action. On the other hand, external elements at the bottom are more susceptible to high levels of pollution, especially in city centres. In this sense, the main purpose of this study was to analyse the degradation processes in buildings with different heights and understand whether the processes and maintenance requirements are statistically different. A sample of 203 natural stone claddings (NSC), located in Portugal, was used as case study. The sample was collected based on the diagnosis of the degradation condition of these claddings through in situ visual inspections. To predict the degradation process of NSC over time, a stochastic service life prediction model, based on Petri nets (PN), was implemented. This model allows evaluating the performance of NSC by encompassing the uncertainty of the future performance of the claddings. The results obtained through the degradation and maintenance models were compared with real case studies to highlight the real impact of buildings’ height subjected to environmental exposure conditions on the maintainability of NSC. Full article
Show Figures

Figure 1

23 pages, 3085 KiB  
Article
Sustainability in the Civil Construction Sector Supported by Industry 4.0 Technologies: Challenges and Opportunities
by Jacqueline de Almeida Barbosa Franco, Ana Mariele Domingues, Nelson de Almeida Africano, Rafael Mattos Deus and Rosane Aparecida Gomes Battistelle
Infrastructures 2022, 7(3), 43; https://0-doi-org.brum.beds.ac.uk/10.3390/infrastructures7030043 - 16 Mar 2022
Cited by 18 | Viewed by 6414
Abstract
The civil construction sector is under pressure to make construction processes more sustainable, that is, aligned with economic, social, and environmental sustainability. Thus, the research question considers: How do Industry 4.0 Technologies help civil construction face challenges and identify new opportunities to become [...] Read more.
The civil construction sector is under pressure to make construction processes more sustainable, that is, aligned with economic, social, and environmental sustainability. Thus, the research question considers: How do Industry 4.0 Technologies help civil construction face challenges and identify new opportunities to become sustainable? The general objective of this work is to offer a current overview of publications that associate the civil construction sector; Industry 4.0 Technologies and sustainability, and identify the challenges and opportunities of the Industry 4.0 Technologies set to contribute to sustainability achievement. The research method was a bibliographic review combined with bibliometric analysis in SCOPUS databases. The results show that civil construction faces the challenge of reducing the consumption of natural resources, ensuring safe work, and optimizing processes, especially handwork. However, the insertion of Industry 4.0 Technologies into civil construction has allowed sensors, robots, modelling and simulation systems, artificial intelligence, and drones to have their productivity, efficiency, safety, strategic and environmental management enhanced. Furthermore, Industry 4.0 Technologies can contribute to civil construction through innovative, sustainable, and technological solutions focused on the flow of work, which can provide growth through the balance of costs/benefits in the management of projects and works. Thus, it is expected that this article will contribute to discussions around the possibility of construction becoming sustainable with the support of Industry 4.0 Technologies. Full article
Show Figures

Figure 1

17 pages, 6025 KiB  
Article
A Discussion on Winter Indoor Hygrothermal Conditions and Hygroscopic Behaviour of Plasters in Southern Europe
by Alessandra Ranesi, Magda Posani, Rosário Veiga and Paulina Faria
Infrastructures 2022, 7(3), 38; https://0-doi-org.brum.beds.ac.uk/10.3390/infrastructures7030038 - 09 Mar 2022
Cited by 5 | Viewed by 2119
Abstract
In Southern European countries, due to the specific climate, economy and culture, a permanent heating practice during winter is not widely adopted. This may have a significant effect on the performance of indoor coating materials, typically tested considering hygrothermal conditions in the range [...] Read more.
In Southern European countries, due to the specific climate, economy and culture, a permanent heating practice during winter is not widely adopted. This may have a significant effect on the performance of indoor coating materials, typically tested considering hygrothermal conditions in the range of 33–75% relative humidity (RH) and 20–25 °C, which are common in continuously heated buildings. In this study, the indoor climate of four bedrooms located in Lisbon, Portugal, was monitored under operational conditions. Based on the data monitored in the case studies, characteristic ranges of indoor hygrothermal conditions were defined and compared to those considered in standard test procedures. In addition, numerical simulations were adopted to compare the hygroscopic performance of four plasters under operational conditions observed on-site. Results show that the four rooms, intermittently heated or unheated, do not provide comfort conditions over 50% of the wintertime, with temperatures lower and RH higher than the ones recommended by the standards. The MBVs resulting from simulations (under operational conditions) are qualitatively in agreement with the MBVs obtained under standard testing conditions. Nonetheless, future studies are recommended to evaluate if standard tests are quantitatively representative of the hygroscopic performance of coating materials in the Southern European scenario. Full article
Show Figures

Figure 1

15 pages, 4366 KiB  
Article
Design and Thermal Characterization of Two Construction Solutions with and without Incorporation of Macroencapsulated PCM
by António Figueiredo, Filipe Rebelo, António Samagaio, Romeu Vicente and Jorge Lira
Infrastructures 2022, 7(3), 27; https://0-doi-org.brum.beds.ac.uk/10.3390/infrastructures7030027 - 22 Feb 2022
Cited by 4 | Viewed by 2529
Abstract
Improving the energy efficiency of new and existing building stock while fostering the use of renewable energy is one of the major goals of the Renovation Wave initiative promoted by the European Union. In this framework, the present research focuses on the design [...] Read more.
Improving the energy efficiency of new and existing building stock while fostering the use of renewable energy is one of the major goals of the Renovation Wave initiative promoted by the European Union. In this framework, the present research focuses on the design of an innovative and efficient construction solution for an external envelope and internal partitions that can improve energy efficiency and thermal comfort in lightweight construction technology for buildings. The use of phase change materials (PCMs), particularly in the macroencapsulated form, in building construction solutions or components enhances the buildings’ thermal mass without significantly increasing the solutions’ weight. Therefore, the solution herein developed is essentially targeted at lightweight building technology since the incorporation of a macroencapsulated PCM core will allow to store and release large amounts of energy per volume unit, in order to attenuate high indoor temperature fluctuations. In the scope of this study, the use of a thermally active core in a lightweight construction solution was designed and thermally characterized. Thus, an experimental campaign on the thermal properties of the solution containing macroencapsulated PCMs was performed, intended for applications in two twin full-scale cold-formed steel lightweight tiny houses. Regarding the hot box heat flux meter approach, the results revealed the following: good correlation between thermal conductivity and mean specimen temperatures for both construction assemblies tested, and significant thermal amplitude reduction with the use solution containing the macroencapsulated PCM core. Full article
Show Figures

Figure 1

23 pages, 3876 KiB  
Article
Bio-Wastes as Aggregates for Eco-Efficient Boards and Panels: Screening Tests of Physical Properties and Bio-Susceptibility
by Eleonora Cintura, Paulina Faria, Marta Duarte and Lina Nunes
Infrastructures 2022, 7(3), 26; https://0-doi-org.brum.beds.ac.uk/10.3390/infrastructures7030026 - 22 Feb 2022
Cited by 8 | Viewed by 2553
Abstract
Screening tests were developed or adapted from RILEM recommendations, standards and past studies, and carried out to characterize some agro-industrial wastes and to assess their feasibility as aggregates for eco-efficient building composites. Spent coffee grounds, grape and olive press waste and hazelnut shells [...] Read more.
Screening tests were developed or adapted from RILEM recommendations, standards and past studies, and carried out to characterize some agro-industrial wastes and to assess their feasibility as aggregates for eco-efficient building composites. Spent coffee grounds, grape and olive press waste and hazelnut shells were used, as well as maritime pine chips as control material. Particle size distribution, loose bulk density, thermal conductivity and hygroscopicity properties were analysed. The selected bio-wastes did not show good thermal insulation properties if compared with some bio-wastes already studied and used for thermal insulation composites. Values of loose bulk density and thermal conductivity were between 325.6–550.5 kg/m3 and 0.078–0.107 W/(m·K); moisture buffering values higher than 2.0 g/(m2·%RH). Biological susceptibility to mould and termites were also tested, using not yet standardized methods. The low resistance to biological attack confirms one of the greatest drawbacks of using bio-wastes for building products. However, final products properties may be changed by adding other materials, pre-treatments of the wastes and the production process. Full article
Show Figures

Figure 1

17 pages, 5152 KiB  
Article
Current Practice and Potential Associated with Timber-Based Solutions for Buildings Retrofitting
by Cláudio Meireis, Filipa S. Serino, Carlos Maia, André C. Fontes and Jorge M. Branco
Infrastructures 2022, 7(2), 25; https://0-doi-org.brum.beds.ac.uk/10.3390/infrastructures7020025 - 18 Feb 2022
Cited by 1 | Viewed by 3685
Abstract
Current buildings are responsible for the highest energy consumption, exceeding polluting sectors such as industry and transports. In Portugal, a large part of the building stock was built in the 1970s and 1980s, but buildings dated from the 1960s and 1970s are the [...] Read more.
Current buildings are responsible for the highest energy consumption, exceeding polluting sectors such as industry and transports. In Portugal, a large part of the building stock was built in the 1970s and 1980s, but buildings dated from the 1960s and 1970s are the ones with the most anomalies and worst quality of construction and, therefore, worst energy performance. The renovation of those buildings can represent an excellent opportunity to correct and improve their energy deficiency and, with that, to promote a more sustainable building stock. The ETICS system is the most used for the renovation of buildings in Portugal due to its lower cost, quick application and thermal efficiency, but it doesn’t solve other problems that may exist, such as structural safety and interior organization of the existing building. The application of prefabricated systems in the envelope has proved to be successful in improving energy efficiency, allowing new volumes and extra areas while contributing to the structural resilience of existing buildings. This paper aims to describe the current situation of the buildings renovation in Portugal and to discuss the potential of innovative envelope retrofitting solutions, using natural materials like timber, and is more concerned with the problems of existing buildings and the need for comfort and space for the occupants. Full article
Show Figures

Figure 1

24 pages, 3474 KiB  
Article
Sustainable Human Development at the Municipal Level: A Data Envelopment Analysis Index
by Pedro A. B. Lima, Gilberto D. Paião Júnior, Thalita L. Santos, Marcelo Furlan, Rosane A. G. Battistelle, Gustavo H. R. Silva, Diogo Ferraz and Enzo B. Mariano
Infrastructures 2022, 7(2), 12; https://0-doi-org.brum.beds.ac.uk/10.3390/infrastructures7020012 - 21 Jan 2022
Cited by 4 | Viewed by 3641
Abstract
The development of indexes for human development and environmental sustainability issues are an emerging topic in the current literature. However, the literature has put less emphasis on municipal indexes, which is the focus of this research. In this paper, we considered municipal environmental [...] Read more.
The development of indexes for human development and environmental sustainability issues are an emerging topic in the current literature. However, the literature has put less emphasis on municipal indexes, which is the focus of this research. In this paper, we considered municipal environmental management as the adoption of environmental activities and the development of infrastructural and technical capacities in municipalities. This article aims to create a sustainable human development index with municipal data from the state of São Paulo in Brazil. Using information from the Municipal Human Development Index (IDHm) and the GreenBlue Municipal Program (PMVA), we applied the data envelopment analysis (DEA) technique to connect human development and environmental sustainability in 645 Brazilian municipalities. Our findings show that regions with higher human development present better DEA scores on the Sustainable Human Development Index. In contrast, regions with a low or a middle level of human development do not present significant change considering both dimensions. Moreover, our findings reveal that PMVA certification has a different and statistically significant impact on the DEA score considering certified, qualified, or not qualified regions. We found similar results for urbanized and service-oriented municipalities. Our indicator is an essential and straightforward tool for regional policymakers, helping to allocate resources and to find human development and environmental sustainability benchmarks among developing regions. Full article
Show Figures

Figure 1

Back to TopTop