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Green products from herbal medicine wastes by subcritical water treatment
- Farzad Seidi
- Mohsen Khodadadi Yazdi
- Maryam Jouyandeh
- Sajjad Habibzadeh
- Muhammad Tajammal Munir
- Henri Vahabi
- Babak Bagheri
- Navid Rabiee
- Payam Zarrintaj
- Mohammad Saeb
2022 JOURNAL OF HAZARDOUS MATERIALS
Herbal medicine wastes (HMWs) are byproducts of medicine factories, which are mainly landfilled for their environmental problems. Only bearing in mind the contamination and concerns caused by the COVID-19 pandemic and environmental emissions, the worth of herbal medicine wastes management and conversion to green products can be understood. In this work, subcritical water treatment was carried out batch-wise in a stainless tube reactor in the pressure range of 0.792–30.0 MPa, varying the temperature (127–327 °C) and time (1–60 min) of extraction. This resulted in new and green material sources, including organic acids, amino acids, and sugars. Amazingly, at very low extraction times (below 5 min) and high temperatures (above 277 °C), about 99% of HMWs were efficaciously converted to clean products by subcritical hydrothermal treatment. The results of hydrothermal extraction after 5 min indicated that at low temperatures (127–227 °C), the total organic carbon in the aqueous phase increased as the residual solid phase decreased, reaching a peak around 220 °C. Acetone soluble extracts or fat phase appeared above 227 °C and reached a maximum yield of 21% at 357 °C. Aspartic acid, threonine, and glycine were the primary amino acids; glycolic acid, formic acid, lactic acid, and acetic acid were obtained as the main organic acids, glucose, fructose, and cellobiose were substantial sugars produced from the aqueous phase after 5 min of hydrothermal subcritical hydrolysis extraction.
Green, simple analytical method for biogenic amines determination in fruit juice samples using salting-out assisted liquid-liquid microextraction and gas chromatography-mass spectrometry
- Anna Różańska
- Magdalena Fabjanowicz
- Kaja Kalinowska
- Żaneta Polkowska
- Justyna Płotka-Wasylka
2022 Pełny tekst FOOD CHEMISTRY
Salting-out assisted liquid-liquid microextraction (SALLME) was integrated with the derivatization procedure to establish a one-step sample pre-treatment approach for rapid analysis of 14 biogenic amines (BAs) in fruit juices. The methodology consists of salting-out of analytes, derivatization with ethyl chloroformate (ECF), extraction with ethyl acetate (EtAc), and the analysis of the derivatized BAs using gas chromatography-mass spectrometry (GC–MS). Optimization of the SALLME parameters, including the amount of sample, NaOH, and ECF was carried out through a Box-Behnken response surface design. The developed method exhibits satisfactory limits of detection (from 1.5 to 8.1 μg/L) and quantification (from 5.0 to 26.7 μg/L), and average recoveries between 84% and 108%. The developed procedure was used for BAs determination in juices of different berries with the highest determined concentrations found for cadaverine, putrescine, tryptamine, and tyramine. Both GAPI and AGREE tools were used to assess the green character of the SALLME-GC–MS procedure.
Greencoin – educational information system for ecoinclusion and empowering urban adaptability.
- Hanna Obracht-Prondzynska
- Helena Anacka
- Ewa Duda
- Kacper Radziszewski
- Kacper Wereszko
- Jolanta Kowal
2022 Pełny tekst
The SARS-CoV19 pandemic exposed a broad spectrum of challenges for modern cities, societies and the environment at large. The post-Covid transformation requires new social, ecological and educational solutions, adjusted to modern challenges, but also equipped with technological advances that allow for digital inclusion and sustainable urban development to benefit the local economy and society. Many information systems designed to enable pro-environmental behaviours are being tested or implemented worldwide, mostly in developed countries; however, most of them focus on a sectorial approach only. On the other hand, community currencies (CCs) consider social, economic, and environmental issues yet do not fully exploit the potential of the current technological advancement. Therefore, the paper describes the process of defining the theoretical framework for Greencoin as an information system designed to be a supportive tool while shaping urban adaptability and mitigating climate change, within which a CC is embedded. The 120 social currencies and information systems (IS) analysed in this research provide valuable data that is essential to shaping the framework of the Greencoin IS, to be implemented in the subsequent stages of the project. Greencoin IS aims to operate based on an application, the work resulting from studies of existing solutions, their functionalities and technological aspects, which enable social engagement and eco-inclusion. It responds to the question of how the new types of currencies and applications enriched with gamification elements can encourage residents to get involved in shaping urban resilience. This research goal is to build a future framework for Greencoin IS based on the performed systematic literature review and case studies.
Greencoin as an AI-Based Solution Shaping Climate Awareness.
- Hanna Obracht-Prondzynska
- Ewa Duda
- Helena Anacka
- Jolanta Kowal
2022 Pełny tekst International Journal of Environmental Research and Public Health
Our research aim was to define possible AI-based solutions to be embedded in the Green- coin project, designed as a supportive tool for smart cities to achieve climate neutrality. We used Kamrowska-Załuska’s approach for evaluating AI-based solutions’ potential in urban planning. We narrowed down the research to the educational and economic aspects of smart cities. Furthermore, we used a systematic literature review. We propose solutions supporting the implementation process of net zero policies benefiting from single actions of urban dwellers based on the Greencoin project developed by us. By following smart city sectors, the paper introduces AI-based solutions which can enrich Greencoin by addressing the following needs: (1) shaping pro-environmental behaviors, (2) introducing instruments to reinforce the urban management process, (3) supporting bottom-up ini- tiatives allowing to shape urban resilience, (4) enhancing smart mobility, (5) shaping local economies supporting urban circularity, and (6) allowing better communication with residents. Our research fills the gap in the limited group of studies focused on shaping climate awareness, enhancing smart governance, and supporting social participation and inclusion. It proves that AI-based educational tools can be supportive when implementing adaptation policies toward climate neutrality based on our proposed AI-based model shaping climate awareness.
Greenery and Urban Form vs. Health of Residents: Evaluation of Modernist Housing in Lodz and Gdansk
- Magdalena Rembeza
- Malgorzata Hanzl
2022 Pełny tekst Urban Planning
Urban forms can have numerous direct and indirect effects on the health of residents. This article focuses on the rela‐ tionship between health and urban form, in particular the role of green open spaces. The goal is to identify criteria for evaluating the impact of physical forms such as streets and open spaces, green infrastructure, and built structures on urban health. These criteria are then used to identify paths for the redevelopment of modernist housing estates with the aim of improving living conditions. This challenge remains particularly significant in Poland and Eastern Europe, where a large share of the urban population lives in modernist blocks of flats. First, we examine the modernist housing concept in Europe and Poland and the guiding principles for their development, including the role of green, open spaces. Then, we refer to several studies on urban health to identify normative factors that define the open space design conditions in modernist housing estates. We apply the typo‐morphological approach with qualitative and quantitative assessment of building forms and forms of green open spaces to examine the structures of two modernist housing estates in Poland: Lodz and Gdansk. We evaluate their living conditions, especially the organisation of outdoor space, in terms of their impact on the health of residents. A comparison of the two housing estates reveals common factors defining the relationship between urban form and health.
Grid-Forming Operation of Energy-Router Based on Model Predictive Control with Improved Dynamic Performance
- Mahdieh Najafzadeh
- Natalia Strzelecka
- Oleksandr Husev
- Indrek Roasto
- Kawsar Nassereddine
- Dmitri Vinnikov
- Ryszard Strzelecki
2022 Pełny tekst ENERGIES
The focus of this study is on the grid-forming operation of the Energy Router (ER) based on Model Predictive Control (MPC). ER is regarded as a key component of microgrids. It is a converter that interfaces the microgrid (s) with the utility grid. The ER has a multiport structure and bidirectional energy flow control. The ER concept can be implemented in Nearly Zero-Energy Buildings (NZEB) to provide flexible energy control. A concept is proposed where the ER works as a single grid-forming converter. The challenge is to keep the predefined reference voltage and frequency inside the NZEB in all possible modes, including the idle operation mode, current sources, and nonlinear load control. To gain stability and output voltage quality, the MPC is proposed. The design of the modified MPC algorithm with improved dynamics performance is explained. PLECS software is utilized to verify the proposed algorithm. The results demonstrate the suitable performance of the proposed control method in terms of total harmonic distortion of the output voltage. The influence of weighting coefficiencies is evaluated, showing the higher impact of the capacitor filter voltage on lowering the total harmonics distortion of the output voltage. Finally, the capability of the control system toward step change in the reference value is evaluated.
Ground tire rubber functionalization as a promising approach for the production of sustainable adsorbents of environmental pollutants
- Łukasz Zedler
- Shifeng Wang
- Krzysztof Formela
2022 Pełny tekst SCIENCE OF THE TOTAL ENVIRONMENT
Waste tires management and further utilization are currently one of the biggest concerns regarding the environment and human health protection. At present, shredding, grinding, or pulverization of waste tires are the most popular options for industrial recycling. Although many solutions for ground tire rubber (GTR) applications were checked and verified so far, their further implementation at an industrial scale is still very limited. In this brief review work, ground tire rubber functionalization strategies as a promising approach for the production of sustainable adsorbents of environmental pollutants were presented and discussed. Our findings indicate that suitable functionalization of GTR significantly improves adsorption capacity or selectivity of prepared GTR-based adsorbents. However, it should be mentioned that most of the performed research based on multi-step and time-consuming protocols of GTR functionalization is performed usually in the presence of solvents, which results in very low efficiency and as a consequence high-cost and limited applications. Current research trends showed that reactive extrusion can be considered as efficient, solvent-free, and pro-ecological alternative for commonly investigated periodic methods of GTR functionalization. This work shows that reactive extrusion is a promising method for further development of GTR-based adsorbents dedicated to environmental pollutants.
Ground Tire Rubber Modified by Elastomers via Low-Temperature Extrusion Process: Physico-Mechanical Properties and Volatile Organic Emission Assessment
- Paulina Wiśniewska
- Łukasz Zedler
- Mariusz Marć
- Marek Klein
- Józef Haponiuk
- Alina Formela
2022 Pełny tekst Polymers
In this paper, low-temperature extrusion of ground tire rubber was performed as a proecological waste tires recycling method. During this process, ground tire rubber was modified with constant content of dicumyl peroxide and a variable amount of elastomer (in the range: 2.5–15 phr). During the studies, three types of elastomers were used: styrene-butadiene rubber, styreneethylene/butylene-styrene grafted with maleic anhydride and ethylene-octene copolymer. Energy consumption measurements, curing characteristics, physico-mechanical properties and volatile organic compounds emitted from modified reclaimed GTR were determined. The VOCs emission profile was investigated using a passive sampling technique, miniature emission chambers system and static headspace analysis and subsequently quantitative or qualitative analysis by gas chromatography. The VOCs analysis showed that in the studied conditions the most emitted volatile compounds are dicumyl peroxide decomposition by-products, such as: α-methylstyrene, acetophenone, α-cumyl alcohol, methyl cumyl ether, while the detection level of benzothiazole (devulcanization “marker”) was very low. Moreover, it was found that the mechanical properties of the obtained materials significantly improved with a higher content of styrene-butadiene rubber and styrene-ethylene/butylene-styrene grafted with maleic anhydride while the opposite trend was observed for ethylene-octene copolymer content.
Growth inhibition of cultured cancer cells by Ribes nigrum leaf extract
- Mikayel Ginovyan
- Agnieszka Bartoszek-Pączkowska
- Izabela Koss-Mikołajczyk
- Barbara Kusznierewicz
- Pierre Andreoletti
- Mustapha Cherkaoui-malki
- Naira Sahakyan
2022 Pełny tekst AIMS Biophysics
The present article includes data on the possible selective cytotoxic effect of extract of Ribes nigrum L. growing at high Armenian landscape. For this purpose, different non-cancer (microglial BV-2 wild type (Wt), acyl-CoA oxidase 1 (ACOX1) deficient (Acox1-/-) and cancer (human colon adenocarcinoma HT29 and human breast cancer MCF7) cell lines were applied. R. nigrum leaf ethanol extract showed a growth inhibition effect towards HT29 and MCF7 cells started from 6 h of treatment at the concentration of 0.5 mg/mL DW. The lowest concentration (0.125 mg/mL DW) of the investigated extract expressed cytotoxicity after 72 hours following cancer cell treatment. In contrast to the cancer cells, in the case of the tested non-cancer cells, cytotoxic effect was not observed at the applied concentrations. The extract sub-cytotoxic concentration, in this case, was reported to be the 1 mg/mL DW. Further investigations are needed to confirm the selective cytotoxicity and possible action mechanisms of the leaf extract of R. nigrum.
GTR/Thermoplastics Blends: How Do Interfacial Interactions Govern Processing and Physico-Mechanical Properties?
- Mohammad Saeb
- Paulina Wiśniewska
- Agnieszka Susik
- Łukasz Zedler
- Henri Vahabi
- Xavier Colom
- Javier Cañavate
- Agnieszka Tercjak
- Krzysztof Formela
2022 Pełny tekst Materials
In this work, GTR/thermoplastics blends (in ratio 50/50 and 75/25 wt.%) were prepared by melt-compounding in an internal mixer. During research, trans-polyoctenamer rubber (TOR), ethylene-vinyl acetate copolymer (EVA), ethylene-octene copolymer (EOC), and linear low-density polyethylene (LLDPE), were used in their thermoplastic phase. Microstructure and processing-performance property interrelationships of the studied materials were investigated by: atomic force microscopy (AFM), scanning electron microscopy (SEM), rubber process analyzer (RPA), Mooney viscometer, plastometer, gas chromatography with mass spectrometry, differential scanning calorimetry (DSC), tensile tests and swelling behavior. In blends of thermoplastics with a high content of GTR (50 and 75 wt.%), the thermoplastic modifier type had a significant impact on the processing behavior and microstructure of blends. In terms of the physico-mechanical properties, the GTR/thermoplastics ratio affected elongation at break, hardness, and density, while its effect on tensile strength was negligible. DSC analysis showed that thermoplastics, as modifiers of GTR, should be considered as binders and not plasticizers, as reflected in the almost constant glass-transition temperature of the blends. RPA measurements indicated higher values of G* and η* for GTR-rich blends. SEM showed a rubber-like interfacial break, while AFM confirmed interfacial contact between GTR and thermoplastics.
Guanosine Dianions Hydrated by One to Four Water Molecules
- Samanta Makurat
- Qinqin Yuan
- Jacek Czub
- Lidia Chomicz-Mańka
- Wenjin Cao
- Xue-Bin Wang
- Janusz Rak
2022 Pełny tekst Journal of Physical Chemistry Letters
Intermolecular interactions such as those present in molecule···water complexes may profoundly influence the physicochemical properties of molecules. Here, we carried out an experimental–computational study on doubly deprotonated guanosine monophosphate···water clusters, [dGMP – 2H]2–·nH2O (n = 1–4), using a combination of negative anion photoelectron spectroscopy (NIPES) with molecular dynamics (MD) and quantum chemical (QM) calculations. Successive addition of water molecules to [dGMP – 2H]2– increases the experimental adiabatic detachment (ADE) and vertical detachment energy (VDE) by 0.5–0.1 eV, depending on the cluster size. In order to choose the representative conformations, we combined MD simulations with a clustering procedure to identify low energy geometries for which ADEs and VDEs were computed at the CAM-B3LYP/6-31++G(d,p) level. Our results demonstrate that the assumed approach leads to sound geometries and energetics of the studied microsolvates since the calculated ADEs and VDEs are in pretty good agreement with the experimental characteristics. The evolution of hydrogen bonding with cluster size indicates the possibility of the occurrence of proton transfer for clusters comprising a larger number of water molecules.
GVC involvement and the gender wage gap: Micro -evidence on European countries
- Dagmara Nikulin
- Joanna Wolszczak-Derlacz
2022 Structural Change and Economic Dynamics
We examine linkages between involvement in global value chains (GVCs) and gender wage inequalities. We use merged data from Structure of Earnings Survey and the World Input Output Database covering 18 European countries. We employ information on employees’ personal and company characteristics and a sectoral involvement in GVCs. In general, the wages of workers from sectors more involved in GVCs are lower. However, the relationship between GVC and wages differs according to gender: women are more affected by the negative impact of greater trade involvement than men. There is some education/skill heterogeneity: workers with a medium level of education and medium skills are most affected. Our results show different patterns for concentrated and competitive industries: a greater female wage penalty due to GVC intensification is observed in less competitive sectors. Finally, using the RIF decomposition we differentiate GWG into explained and unexplained part with GVC being responsible for the latter.
Harnessing digital technologies for poverty reduction. Evidence for low-income and lower-middle income countries
- Ewa Lechman
- Magdalena Popowska
2022 Pełny tekst TELECOMMUNICATIONS POLICY
This paper contributes to understanding the relationship between ICT deployment and poverty alleviation in developing countries. It assess the digital technologies contribution to poverty reduction, through different channels of impact, like education, labor market, income and ICTtrade related activities. Using the sample of 40 developing countries between 1990 and 2019, it relies on macro data extracted from the World Bank Development Indicators (2021) and the World Telecommunication/ICT Indicators Database (2020). Methodological framework combines time trend analysis and locally weighted polynomial smoother, logistic growth model, and panel regression modelling techniques. Our major findings suggest growing ICT deployment, school enrolments, and increases in material wealth are significant drivers of poverty eradication in developing economies. However, the impact of digitalization on poverty is neither direct nor immediate. Therefore, we claim that national and local authorities, together with civil society must consider ICT as a key element of their broad development strategies.
Have you heard about ALAN? Now, there is also ROLAN!
- Karolina Zielińska-Dąbkowska
2022 Pełny tekst ARC Lighting In Architecture
This article examines the new ROLAN movement and points out why this might be the next big thing for lighting professionals.
HDAC Inhibitors: Innovative Strategies for Their Design and Applications
- Mateusz Daśko
- Beatriz De Pascual-Teresa
- Irene Ortín
- Ana Ramos
2022 Pełny tekst MOLECULES
Histone deacetylases (HDACs) are a large family of epigenetic metalloenzymes that are involved in gene transcription and regulation, cell proliferation, differentiation, migration, and death, as well as angiogenesis. Particularly, disorders of the HDACs expression are linked to the development of many types of cancer and neurodegenerative diseases, making them interesting molecular targets for the design of new efficient drugs and imaging agents that facilitate an early diagnosis of these diseases. Thus, their selective inhibition or degradation are the basis for new therapies. This is supported by the fact that many HDAC inhibitors (HDACis) are currently under clinical research for cancer therapy, and the Food and Drug Administration (FDA) has already approved some of them. In this review, we will focus on the recent advances and latest discoveries of innovative strategies in the development and applications of compounds that demonstrate inhibitory or degradation activity against HDACs, such as PROteolysis-TArgeting Chimeras (PROTACs), tumor-targeted HDACis (e.g., folate conjugates and nanoparticles), and imaging probes (positron emission tomography (PET) and fluorescent ligands).
Head-Space SPME for the Analysis of Organophosphorus Insecticides by Novel Silica IL-Based Fibers in Real Samples
- Karolina Delińska
- Kateryna Yavir
- Adam Kloskowski
2022 Pełny tekst MOLECULES
This work demonstrates the suitability of a newly developed ionic liquid (IL)-based silica SPME fiber for the determination of seven organophosphorus insecticides in cucumber and grapefruit samples by headspace solid-phase microextraction (HS-SPME) with a gas chromatography–flame ionization detector (FID). The sol-gel method released four different sorbent coatings, which were obtained based on a silica matrix containing ILs immobilized inside its pores. In order to obtain ionogel fibers, the following ionic liquids were utilized: 1-Butyl-1-methylpyrrolidinium bis(trifluoromethylsulfonyl)imide; Butyltriethyl ammonium bis(trifluoromethylsulfonyl)imide; 1-(2-Methoxyethyl)-3-methylimidazolium bis(trifluoromethylsulfonyl)imide, and 1-Benzyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide. The developed fibers were applied for the extraction of seven different insecticides from liquid samples. The most important extraction parameters of HS-SPME coupled with the GC-FID method were optimized with a central composite design. The new SPME fiber demonstrated higher selectivity for extracting the analyzed insecticides compared with commercially available fibers. The limit of detection was in the range of 0.01–0.93 μg L−1, the coefficients of determination were >0.9830, and 4.8–10.1% repeatability of the method was found. Finally, the obtained ionogel fibers were utilized to determine insecticides in fresh cucumber and grapefruit juices.
Health Enhancing Physical Activity Policies in Poland: Findings from the HEPA PAT Survey
- Aleksandra Romanowska
- Agnieszka Morawiak
- Catherine Woods
- Liam Kelly
- Kevin Volf
- Peter Gelius
- Sven Messing
- Sarah Forberger
- Jeroen Lakerveld
- Nicolette R. Den Braver
- Enrique García Bengoechea
- Joanna Żukowska
2022 Pełny tekst International Journal of Environmental Research and Public Health
Insufficient physical activity (PA) is one of major risk factors for serious diseases and premature mortality worldwide. Public policies to enhance PA across society are recognized as an effective tool against the problem. This paper presents the results of a comprehensive assessment of national-level PA policy approach in Poland. A standardized survey of Word Health Organization named the Health-Enhancing Physical Activity Policy Audit Tool (HEPA PAT) was used for data collection. Content analysis and strengths, weaknesses, opportunities, and threats analysis (SWOT) were used to characterize various PA policy aspects, to appraise the current situation, and accommodate organizational and environmental factors that it is influenced by. The results show that the national PA policy approach has been constantly developing in Poland, but there is room for improvement in a number of areas. The most important weaknesses are the lack of clear leadership, no mechanisms in place to coordinate efforts undertaken at different levels, and lack of collaboration across different levels of government and across different sectors of economy. Providing an umbrella covering all PA promotion policies and activities is, therefore, a key issue to be addressed. The country should seize the opportunity coming from an increasing awareness of a healthy lifestyle among Polish society.
HEALTH SAFETY OF BREAD IN SMALL BAKERIES
- Radosław Drozd
2022 Pełny tekst Zeszyty Naukowe. Organizacja i Zarządzanie / Politechnika Śląska
The aim of the article is to present the safety and health risks in the production process of bread, supported by research in small bakeries located in the Pomeranian Voivodeship. Health safety of bread is one of the features that decide its quality. This article additionally presents other determinants influencing the quality of bread. It also demonstrates opinions showing food safety as a separate attribute of quality. The paper cites Polish domestic and EU legislation in the areas of food safety, as well as competences of sanitary inspection bodies. The major part of the paper is devoted to the identification of types and potential sources of health threats in the production process of bread and the prevailing prevention system, i.e. HACCP. The research on the structure of the bread and the level of implementation of HACCP was performed in Pomeranian small bakeries, which form 89.4% of the overall Pomeranian bakeries.
Healthier and Environmentally Responsible Sustainable Cities and Communities. A New Design Framework and Planning Approach for Urban Illumination
- Karolina Zielińska-Dąbkowska
2022 Pełny tekst Sustainability
Although sustainability and sustainable development are both considered necessary practices in various fields today, a recent analysis showed that the Sustainable Development Goal SDG11: Sustainable Cities and Communities established by the United Nations does not address urban illumination and its impact. This oversight is of concern because research carried out in the last 20+ years indicates artificial light at night (ALAN) in cities, and the light pollution this generates can have negative consequences on human health and well-being and the entire environment, including ecosystems and the flora and fauna that inhabit them. By applying a literature review, analysis and synthesis method, this work offers a new perspective on lighting and a timeline of key events that established ALAN and light pollution awareness in different disciplines and professional groups connected to urban illumination. It also identifies three fundamental aspects which require further transdisciplinary research and the translation of this knowledge into practice in order to enable the development of sustainable cities and communities at night. Finally, it presents in detail a new, theoretical environment-centred design framework for responsible urban illumination, with four iterative design phases, in order to help guide various stakeholders in cities, along with a four-level pyramid model that can be applied to urban illumination in the form of principles, processes, practices, and tools. This framework is especially relevant for those urban planners, architects, and landscape designers, who are unfamiliar with the subject in order to present the most effective and appropriate lighting design approach and methods that should be taken into consideration with the design of a given urban nighttime environment/situation.
Heave Plates with Holes for Floating Offshore Wind Turbines
- Ewelina Ciba
- Paweł Dymarski
- Mirosław Grygorowicz
2022 Pełny tekst Polish Maritime Research
The paper presents an innovative solution which is heave plates with holes. The long-known heave plates are designed to damp the heave motion of platforms. They are most often used for Spar platforms. The growing interest in this type of platform as supporting structures for offshore wind turbines makes it necessary to look for new solutions. Based on the available literature and the authors’ own research, it was concluded that the main element responsible for the damping of heave plates is not so much the surface of the plate, but its edge. Therefore, it was decided to investigate the effect of the holes in heave plates on their damping coefficient. Model tests and CFD calculations were performed for three different structures: a smooth cylinder, a cylinder with heave plates with a diameter of 1.4 times the diameter of the cylinder, and a cylinder with the same plate, in which 24 holes were cut (Fig. 1). Free Decay Tests (FDT) were used to determine the damping coefficient and the natural period of heave, and then the values obtained were compared. The full and punched heave-plate designs were also tested with regular waves of different periods to obtain amplitude characteristics. The results obtained are not unequivocal, as a complex motion appears here; however, it is possible to clearly define the area in which the damping of a plate with holes is greater than that of a full plate.