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Ancuţa-Elena Tiuc
Department of Environmental Engineering and Sustainable Development Entrepreneurship, Technical University of Cluj-Napoca, 400641 Cluj-Napoca, Romania

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Journal article
Published: 07 May 2021 in Coatings
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Plant fibres are materials that can increase energy savings, and they are being analysed for their reduced environmental impact. In this paper, three types of multi-layered panels were developed as environmentally friendly flax fibre-based products for building industry applications. The structural build-up of the panels is such that one layer of waste flax fibre was used as the core material in order to reduce the weight of the structure between two rigid perlite-based layers. The perlite was used in three varied grain sizes, resulting in three types of panels (S1, S2, S3). The mechanical, thermal and acoustic properties were recorded for all specimens. The influence of the perlite particles’ size, perforation diameter and perforation percentage of the multi-layered panels on the acoustic absorption properties was analysed and discussed. Summarising the results, the multi-layered composite panel S3 presented the best performance in regard to compressive strength and thermal conductivity, with S2 presenting the best bending strength. From the acoustic point of view, for the unperforated panels, the highest values of the sound absorption coefficient were obtained at 500 Hz for S1, α = 0.95, 315 Hz for S2, α = 0.89 and 400 Hz for S3, α = 0.84. The obtained values of the sound absorption coefficients were increased through the varied perforation diameters and percentages of the panels’ front face.

ACS Style

Daniela-Roxana Tămaş-Gavrea; Raluca Iştoan; Ancuţa Tiuc; Tünde-Orsolya Dénes; Ovidiu Vasile; Horia Constantinescu. Development of New Composite Products Based on Flax Fibres. Coatings 2021, 11, 551 .

AMA Style

Daniela-Roxana Tămaş-Gavrea, Raluca Iştoan, Ancuţa Tiuc, Tünde-Orsolya Dénes, Ovidiu Vasile, Horia Constantinescu. Development of New Composite Products Based on Flax Fibres. Coatings. 2021; 11 (5):551.

Chicago/Turabian Style

Daniela-Roxana Tămaş-Gavrea; Raluca Iştoan; Ancuţa Tiuc; Tünde-Orsolya Dénes; Ovidiu Vasile; Horia Constantinescu. 2021. "Development of New Composite Products Based on Flax Fibres." Coatings 11, no. 5: 551.

Journal article
Published: 23 January 2021 in Materials
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Cobalt–chromium (Co–Cr) alloys are the most widely used materials for removable and fixed dental prosthetic frameworks. The fitting accuracy between these components in dental prosthetic frameworks assembles (DPFAs) is largely influenced by the manufacturing method. This study presents a novel manufacturing method that combined two common techniques for obtaining one single framework: casting of Co–Cr inserts on top of parts previously manufactured by selective laser melting (SLM) of Co–Cr powder (CoM). Horizontal (n = 4) and vertical (n = 3) surfaces were microscopically analyzed (n = 770 count sum). The results revealed a high precision of the process and high fitting accuracy between the hybrid frameworks. The average distance measured between the frameworks in joined position was 41.08 ± 7.56 µm. In conclusion, the manufacturing of Co–Cr alloys DPFA using the CoM method reduced the deformation of hybrid frameworks and improved the joining accuracy between them.

ACS Style

Willi Uriciuc; Horatiu Vermesan; Ancuta Tiuc; Aranka Ilea; Adina Bosca; Catalin Popa. Casting Over Metal Method Used in Manufacturing Hybrid Cobalt-Chromium Dental Prosthetic Frameworks Assembles. Materials 2021, 14, 539 .

AMA Style

Willi Uriciuc, Horatiu Vermesan, Ancuta Tiuc, Aranka Ilea, Adina Bosca, Catalin Popa. Casting Over Metal Method Used in Manufacturing Hybrid Cobalt-Chromium Dental Prosthetic Frameworks Assembles. Materials. 2021; 14 (3):539.

Chicago/Turabian Style

Willi Uriciuc; Horatiu Vermesan; Ancuta Tiuc; Aranka Ilea; Adina Bosca; Catalin Popa. 2021. "Casting Over Metal Method Used in Manufacturing Hybrid Cobalt-Chromium Dental Prosthetic Frameworks Assembles." Materials 14, no. 3: 539.

Review
Published: 22 August 2020 in Sustainability
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The circular economy (CE) is a popular concept in the European Union (EU) space, which has been the subject of numerous research and substantiation activities. In the last years, there has been a growing interest in Romania regarding the characteristics of this new economic model and the principles on which it works. Referring to Romanian specialized literature currently available regarding the submitted topic, we consider that the theoretical part is insufficiently structured. In addition, by pointing out the applicability of the circular economy in Romanian space, we consider this to be represented mainly by the fragility of its effective and practical implementation. The examples of Romanian successes in the field of circular economy are limited, a fact that can be explained—from our perspective—through the aspect that in other EU countries, the process of development of CE has some precedents, a stronger background and a ”self-constructed” history in the topic. There is undoubtedly a necessity for adopting this new economic model, considering that, for the most part, Romanian economy is still dependent on the linear economic system. Starting from these arguments, the proposed article uses a thematic debate of the notion of circular economy, presenting, at the beginning, an incursion into the predominantly European variety of theoretical approaches. The selection of definitions and conceptualization is continued with an analysis of the stage of implementation of CE in Romania. The purpose of this approach is to investigate a niche identified in the Romanian space, not covered in the specialized scientific research and to expose the specificity of the process of transition of Romania to a circular economy, of the barriers encountered—namely, the problem related to the attitude and mentality regarding this new concept. We also point out that the intention of the study is to integrate a ”different” contemporary and very current economic concept into a real economy, and at the same time, to increase the visibility of its application at the level of a member country of the EU. The challenges encountered in the context of the increasingly present tendency in Romania of assimilating and complying with the precepts of the circular economy are also detailed, proposing, at the end of the study suggestions for improving the gaps identified at this level. The most realistic implementation of the circular model in Romania represents a qualitative plus for the human-society factor, as well as for the environment. In conclusion, we note that, despite the evolution of the number of theoretical approaches and concerns, the field of circular economy and the perspectives it proposes, continues to offer a favorable ground for further research.

ACS Style

Horațiu Vermeșan; Alexandrina Mangău; Ancuța-Elena Tiuc. Perspectives of Circular Economy in Romanian Space. Sustainability 2020, 12, 6819 .

AMA Style

Horațiu Vermeșan, Alexandrina Mangău, Ancuța-Elena Tiuc. Perspectives of Circular Economy in Romanian Space. Sustainability. 2020; 12 (17):6819.

Chicago/Turabian Style

Horațiu Vermeșan; Alexandrina Mangău; Ancuța-Elena Tiuc. 2020. "Perspectives of Circular Economy in Romanian Space." Sustainability 12, no. 17: 6819.

Journal article
Published: 07 February 2020 in Coatings
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The aim of this paper is to propose a novel sandwich panel, which would be suitable for sound absorption and airborne sound insulation, used as applied cladding or independent lightweight partition wall. As far as the authors are concerned, this is the first sheep wool-based sandwich panel using only natural materials. The structure was prepared using hydrated lime-based composite face sheets and a sheep wool-based core. Several parameters of the sandwich panel were determined, including sound absorption coefficient, airborne sound insulation, thermal conductivity, thermal resistance, compressive strength, and bending strength, respectively. The results indicate that the maximum sound absorption value of 0.903 was obtained at the frequency of 524 Hz in the case of the unperforated sample, 0.822 at 536 Hz in the case of the sample with 10% perforations, 0.780 at 3036 Hz in the case of the sample with 20% perforations, and 0.853 at 3200 Hz in the case of the sample with 30% perforations. The registered airborne sound insulation index of the panel was 38 dB. Based on the obtained data, it can be concluded that the studied panel recorded comparable values with other synthetic noise control solutions, which are suitable as applied cladding or an independent lightweight partition wall, with good acoustic properties.

ACS Style

Daniela-Roxana Tămaş-Gavrea; Tünde-Orsolya Dénes; Raluca Iştoan; Ancuţa Elena Tiuc; Daniela Lucia Manea; Ovidiu Vasile. A Novel Acoustic Sandwich Panel Based on Sheep Wool. Coatings 2020, 10, 148 .

AMA Style

Daniela-Roxana Tămaş-Gavrea, Tünde-Orsolya Dénes, Raluca Iştoan, Ancuţa Elena Tiuc, Daniela Lucia Manea, Ovidiu Vasile. A Novel Acoustic Sandwich Panel Based on Sheep Wool. Coatings. 2020; 10 (2):148.

Chicago/Turabian Style

Daniela-Roxana Tămaş-Gavrea; Tünde-Orsolya Dénes; Raluca Iştoan; Ancuţa Elena Tiuc; Daniela Lucia Manea; Ovidiu Vasile. 2020. "A Novel Acoustic Sandwich Panel Based on Sheep Wool." Coatings 10, no. 2: 148.

Journal article
Published: 04 February 2020 in Materials
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In recent years, natural materials are becoming a valid alternative to traditional sound absorbers due to reduced production costs and environmental protection. This study explores alternative usage of sheep wool as a construction material with improved sound absorbing properties beyond its traditional application as a sound absorber in textile industry or using of waste wool in the textile industry as a raw material. The aim of this study was to obtain materials with improved sound-absorbing properties using sheep wool as a raw material. Seven materials were obtained by hot pressing (60 ÷ 80 °C and 0.05 ÷ 6 MPa) of wool fibers and one by cold pressing. Results showed that by simply hot pressing the wool, a different product was obtained, which could be processed and easily manipulated. The obtained materials had very good sound absorption properties, with acoustic absorption coefficient values of over 0.7 for the frequency range of 800 ÷ 3150 Hz. The results prove that sheep wool has a comparable sound absorption performance to mineral wool or recycled polyurethane foam.

ACS Style

Simona Ioana Borlea (Mureşan); Ancuţa-Elena Tiuc; Ovidiu Nemeş; Horaţiu Vermeşan; Ovidiu Vasile. Innovative Use of Sheep Wool for Obtaining Materials with Improved Sound-Absorbing Properties. Materials 2020, 13, 694 .

AMA Style

Simona Ioana Borlea (Mureşan), Ancuţa-Elena Tiuc, Ovidiu Nemeş, Horaţiu Vermeşan, Ovidiu Vasile. Innovative Use of Sheep Wool for Obtaining Materials with Improved Sound-Absorbing Properties. Materials. 2020; 13 (3):694.

Chicago/Turabian Style

Simona Ioana Borlea (Mureşan); Ancuţa-Elena Tiuc; Ovidiu Nemeş; Horaţiu Vermeşan; Ovidiu Vasile. 2020. "Innovative Use of Sheep Wool for Obtaining Materials with Improved Sound-Absorbing Properties." Materials 13, no. 3: 694.

Review
Published: 20 December 2019 in Sustainability
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Waste from information technology (IT) and telecommunication equipment (WITTE) constitutes a significant fraction of waste from electrical and electronic equipment (WEEE). The presence of rare metals and hazardous materials (e.g., heavy metals or flame retardants) makes the necessary recycling procedures difficult and expensive. Important efforts are being made for Waste Printed Circuit Board (WPCB) recycling because, even if they only amount to 5–10% of the WITTE weight, they constitute up to 80% of the recovered value. This paper summarizes the recycling techniques applicable to WPCBs. In the first part, dismantling and mechanical recycling techniques are presented. Within the frame of electro-mechanical separation technology, the chain process of shredding, washing, and sieving, followed by one or a combination of magnetic, eddy current, corona electrostatic, triboelectrostatic, or gravity separation techniques, is presented. The chemical and electrochemical processes are of utmost importance for the fine separation of metals coming from complex equipment such as WPCBs. Thermal recycling techniques such as pyrolysis and thermal treatment are presented as complementary solutions for achieving both an extra separation stage and thermal energy. As the recycling processes of WPCBs require adequate, efficient, and ecological recycling techniques, the aim of this survey is to identify and highlight the most important ones. Due to the high economic value of the resulting raw materials relative to the WPCBs’ weight and composition, their recycling represents both a necessary environmental protection action, as well as an economic opportunity.

ACS Style

Horațiu Vermeșan; Ancuța-Elena Tiuc; Marius Purcar. Advanced Recovery Techniques for Waste Materials from IT and Telecommunication Equipment Printed Circuit Boards. Sustainability 2019, 12, 74 .

AMA Style

Horațiu Vermeșan, Ancuța-Elena Tiuc, Marius Purcar. Advanced Recovery Techniques for Waste Materials from IT and Telecommunication Equipment Printed Circuit Boards. Sustainability. 2019; 12 (1):74.

Chicago/Turabian Style

Horațiu Vermeșan; Ancuța-Elena Tiuc; Marius Purcar. 2019. "Advanced Recovery Techniques for Waste Materials from IT and Telecommunication Equipment Printed Circuit Boards." Sustainability 12, no. 1: 74.

Conference paper
Published: 27 November 2018 in MATEC Web of Conferences
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The problem of global warming and the reduction of energy consumption have led to an evolutionary progress of research directed towards finding as many solutions as possible to these environmental issues. Firstly, this paper presents the background information on the role of wastewater as a source of heat for the future. Next, the paper includes the analysis elements that define a system for recovering thermal energy from wastewater. The main objective was to identify the parameters that determine the heat transfer. It has started from a conceptual model of the technological system that involves inputs and outputs characterized by technological, physical-chemical, measurable or imposed properties. In the second part this paper presents a numerical model elaborated for the analysis and simulation of the main physical processes, the mass and heat transfer, which underlie the operation of the heat pipe heat exchangers (HPHE). The numerical simulation of heat and mass transfer in the HPHE is computed by using Delphi 7 solver program. This program contained a series of sub-programs for the meshing of the field occupied by the HPHE, another subprogram for solving the meshing equations and the third for post processing. The design of HPHE is the key to provide a heat exchanger system to work proficient as expected. Finally, the result is used to optimize and improving heat recovery systems of the increasing demand for energy efficiency in residential buildings or industry.

ACS Style

Timea Gabor; Ancuta-Elena Tiuc; Ioana Monica Sur; Iulian Nicolae Badila. Numerical analysis and simulation of the heat recovery from wastewater using heat exchanger. MATEC Web of Conferences 2018, 240, 02005 .

AMA Style

Timea Gabor, Ancuta-Elena Tiuc, Ioana Monica Sur, Iulian Nicolae Badila. Numerical analysis and simulation of the heat recovery from wastewater using heat exchanger. MATEC Web of Conferences. 2018; 240 ():02005.

Chicago/Turabian Style

Timea Gabor; Ancuta-Elena Tiuc; Ioana Monica Sur; Iulian Nicolae Badila. 2018. "Numerical analysis and simulation of the heat recovery from wastewater using heat exchanger." MATEC Web of Conferences 240, no. : 02005.

Journal article
Published: 26 November 2018 in Composites Part B: Engineering
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New composite materials based on sawdust as reinforcing material and polyurethane foam as a binder agent, exhibiting sound absorbing proprieties, have been obtained. Due to the sound-absorbent proprieties exhibited by these type of materials, 11 new composite systems have been obtained varying the type and the size of sawdust particles, the percentage of binder and the thickness of material. The sound absorption properties of the new obtained materials are directly correlated with the composition, the thickness of materials as well as the air gap samples and the rigid wall. In addition, the morphological and thermal conductivity proprieties and the mechanical ones, of the new obtained materials, were carried out.

ACS Style

Ancuţa Elena Tiuc; Ovidiu Nemeş; Horaţiu Vermeşan; Adina Cristina Toma. New sound absorbent composite materials based on sawdust and polyurethane foam. Composites Part B: Engineering 2018, 165, 120 -130.

AMA Style

Ancuţa Elena Tiuc, Ovidiu Nemeş, Horaţiu Vermeşan, Adina Cristina Toma. New sound absorbent composite materials based on sawdust and polyurethane foam. Composites Part B: Engineering. 2018; 165 ():120-130.

Chicago/Turabian Style

Ancuţa Elena Tiuc; Ovidiu Nemeş; Horaţiu Vermeşan; Adina Cristina Toma. 2018. "New sound absorbent composite materials based on sawdust and polyurethane foam." Composites Part B: Engineering 165, no. : 120-130.

Journal article
Published: 01 January 2017 in Environmental Engineering and Management Journal
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ACS Style

Timea Gabor; Viorel Dan; Iulian-Nicolae Badila; Ancuta-Elena Tiuc; Ioana Monica Sur. IMPROVING THE ENERGY EFFICIENCY OF RESIDENTIAL BUILDINGS BY USING A DRAIN WATER HEAT RECOVERY SYSTEM. Environmental Engineering and Management Journal 2017, 16, 1631 -1636.

AMA Style

Timea Gabor, Viorel Dan, Iulian-Nicolae Badila, Ancuta-Elena Tiuc, Ioana Monica Sur. IMPROVING THE ENERGY EFFICIENCY OF RESIDENTIAL BUILDINGS BY USING A DRAIN WATER HEAT RECOVERY SYSTEM. Environmental Engineering and Management Journal. 2017; 16 (7):1631-1636.

Chicago/Turabian Style

Timea Gabor; Viorel Dan; Iulian-Nicolae Badila; Ancuta-Elena Tiuc; Ioana Monica Sur. 2017. "IMPROVING THE ENERGY EFFICIENCY OF RESIDENTIAL BUILDINGS BY USING A DRAIN WATER HEAT RECOVERY SYSTEM." Environmental Engineering and Management Journal 16, no. 7: 1631-1636.

Journal article
Published: 01 January 2016 in Environmental Engineering and Management Journal
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ACS Style

Timea Gabor; Viorel Dan; Ancuta Elena Tiuc; Ioana Monica Sur; Iulian Nicolae Badila. MODELLING AND SIMULATION OF HEAT TRANSFER PROCESSES FOR HEAT EXCHANGERS USED IN WASTEWATER TREATMENT. Environmental Engineering and Management Journal 2016, 15, 1027 -1033.

AMA Style

Timea Gabor, Viorel Dan, Ancuta Elena Tiuc, Ioana Monica Sur, Iulian Nicolae Badila. MODELLING AND SIMULATION OF HEAT TRANSFER PROCESSES FOR HEAT EXCHANGERS USED IN WASTEWATER TREATMENT. Environmental Engineering and Management Journal. 2016; 15 (5):1027-1033.

Chicago/Turabian Style

Timea Gabor; Viorel Dan; Ancuta Elena Tiuc; Ioana Monica Sur; Iulian Nicolae Badila. 2016. "MODELLING AND SIMULATION OF HEAT TRANSFER PROCESSES FOR HEAT EXCHANGERS USED IN WASTEWATER TREATMENT." Environmental Engineering and Management Journal 15, no. 5: 1027-1033.

Journal article
Published: 01 January 2016 in Energy Procedia
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Polyurethane foam is an outstanding material for various applications. It is manufactured by propelling liquid isocyanate-polyol mixture to form foams in the presence of a blowing agent. This paper comprises an experimental study on acoustic properties improvement of rigid polyurethane closed-cell foam, by incorporating various quantities of textile waste into the matrix. In order to obtain a homogenous, easy to handle material, an optimal percent of 10-50% textile waste was used. The sound absorption coefficient of the composite materials was measured using an impedance tube. The composite materials obtained have better sound absorption properties compared to rigid polyurethane foam. The noise reduction coefficient (NRC) of the composite material with 40% textile waste and 60% rigid polyurethane foam is twice as high as the 100% rigid polyurethane material.

ACS Style

Ancuţa-Elena Tiuc; Horaţiu Vermeşan; Timea Gabor; Ovidiu Vasile. Improved Sound Absorption Properties of Polyurethane Foam Mixed with Textile Waste. Energy Procedia 2016, 85, 559 -565.

AMA Style

Ancuţa-Elena Tiuc, Horaţiu Vermeşan, Timea Gabor, Ovidiu Vasile. Improved Sound Absorption Properties of Polyurethane Foam Mixed with Textile Waste. Energy Procedia. 2016; 85 ():559-565.

Chicago/Turabian Style

Ancuţa-Elena Tiuc; Horaţiu Vermeşan; Timea Gabor; Ovidiu Vasile. 2016. "Improved Sound Absorption Properties of Polyurethane Foam Mixed with Textile Waste." Energy Procedia 85, no. : 559-565.

Journal article
Published: 01 January 2016 in Environmental Engineering and Management Journal
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ACS Style

Ancuta-Elena Tiuc; Viorel Dan; Horatiu Vermesan; Timea Gabor; Marian Proorocu. RECOVERY OF SAWDUST AND RECYCLED RUBBER GRANULES AS SOUND ABSORBING MATERIALS. Environmental Engineering and Management Journal 2016, 15, 1093 -1101.

AMA Style

Ancuta-Elena Tiuc, Viorel Dan, Horatiu Vermesan, Timea Gabor, Marian Proorocu. RECOVERY OF SAWDUST AND RECYCLED RUBBER GRANULES AS SOUND ABSORBING MATERIALS. Environmental Engineering and Management Journal. 2016; 15 (5):1093-1101.

Chicago/Turabian Style

Ancuta-Elena Tiuc; Viorel Dan; Horatiu Vermesan; Timea Gabor; Marian Proorocu. 2016. "RECOVERY OF SAWDUST AND RECYCLED RUBBER GRANULES AS SOUND ABSORBING MATERIALS." Environmental Engineering and Management Journal 15, no. 5: 1093-1101.