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Search results for: VENTRAL HERNIA
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Issues of Estimating the Maximum Distributed Generation at High Wind Power Participation
PublicationThis paper presents the methods of estimating the maximum power that can be connected to the power system in distributed generation sources. Wind turbine generator systems (WTGS) were selected as the subject for analysis. Nonetheless, the considerations presented in this paper are only general and also apply to other types of power sources, including the sources that are not considered part of distributed generation.
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Adaption of Open Science Paradigm at Gdańsk University of Technology
PublicationOpen Access plays growing role in sharing results of today's research. The movement is very strong and many Universities, including Gdańsk University of Technology, are adapting this approach. This paper presents general information about Open Access movement and the approach adapted by the Gdańsk University of Technology. The components of Open Science platform as well as the procedures are described.
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Unifying Aspects of Generalized Calculus
PublicationNon-Newtonian calculus naturally unifies various ideas that have occurred over the years in the field of generalized thermostatistics, or in the borderland between classical and quantum information theory. The formalism, being very general, is as simple as the calculus we know from undergraduate courses of mathematics. Its theoretical potential is huge, and yet it remains unknown or unappreciated.
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Simulation of willow productivity based on radiation use efficiency, shoot mortality and shoot age
PublicationPraca przedstawia model matematyczny produktywności plantacji wiklinowych. Dokonano oceny efektywności wykorzystania radiacji słonecznej przez badane plantacje, optymalnie nawadniane i nawożone. Wyniki obliczeń i pomiarów wykazują dużą zgodność, chociaż nie zawszespełnione było wymaganie dotyczące optymalnych warunków wzrostu.
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Optimised five-hour multiplex PCR test for the detection of Tinea ungium: performance in a routine PCR laboratory
PublicationWe recently published the development of a 5-hour multiplex PCR test for the detection of dermatophyte nail infection. We have optimized this test by inclusion of an inhibition control and evaluated the test in a routine laboratory when compared to the conventional microscopy and culture. A total of 109 clinical samples received at the mycology reference lab at Statens Serum Institute were included. The samples were divided equally...
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GIS Integrated Modelling of a Himalayan Landscape
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Optimized 5-hour multiplex PCR test for the detection of tinea unguium: performance in a routine PCR laboratory
PublicationWe recently reported the development of a 5-hour multiplex PCR test for the detection of tinea unguium and the optimization of this test by the inclusion of an inhibition control. Here we report the performance of this procedure as used in a routine clinical laboratory as compared to conventional microscopy and culture-based techniques performed in a mycology reference laboratory. We found in processing 109 samples that 22 (20.2%)...
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Gender-Selective Interaction Between Aging, Blood Pressure, and Sympathetic Nerve Activity
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Sympathetic Neural Outflow and Chemoreflex Sensitivity Are Related to Spontaneous Breathing Rate in Normal Men
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Effects of acute and long-term slow breathing exercise on muscle sympathetic nerve activity in untreated male patients with hypertension
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Revelations About Carotid Body Function Through its Pathological Role in Resistant Hypertension
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Charge density wave, enhanced mobility, and large nonsaturating magnetoresistance across the magnetic states of HoNiC2 and ErNiC2
PublicationWe report on magnetotransport and thermoelectric properties of two ternary carbides HoNiC2 and ErNiC2 hosting both charge density wave and long-range magnetic order. In the charge density wave state, both compounds show relatively large magnetoresistance MR ≈ 150% in HoNiC2 and ≈ 70%in ErNiC2 at a magnetic field of 9 T and temperature as low as 2 K. This positive field-linear magnetoresistance shows no signatures of saturation....
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WYMAGANIA STAWIANE LEKKIEJ OBUDOWIE
PublicationW artykule omówiono wymagania stawiane lekkim obudowom. Przywołano odpowiednie normy i rozporządzenia dotyczące zagadnień ogólnobudowlanych i techniczno-użytkowych.
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SYMULACJA DŹWIĘKU PRZESTRZENNEGO W ŚCIEŻCE DŹWIĘKOWEJ W ODSŁUCHU BINAURALNYM
PublicationCelem pracy jest przedstawienie aplikacji umożliwiającej tworzenie stereofonicznej ścieżki dźwiękowej do filmu, symulującej dźwięk przestrzenny w odsłuchu słuchawkowym. Interfejs przygotowanej aplikacji pozwala użytkownikowi na wybór rozmieszczenia konkretnych partii instrumentalnych w odpowiednich miejscach w przestrzeni dźwiękowej oraz jednoczesny odsłuch wszystkich ścieżek wraz z przygotowanym materiałem filmowym. Symulacja...
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Czynniki sukcesu i ich wpływ na proces produkcji
PublicationProces produkcji jest jednym z elementów łańcucha dostaw. Z tego względu podstawš do okrelenia atrybutów procesu produkcji jest jego rola w osišgnięciu sukcesu przez cały łańcuch dostaw. W wyniku dokonanej analizy literatury dotyczšcej problematyki kluczowych czynników sukcesu łańcucha dostaw, do okrelenia atrybutów procesu produkcji został wykorzystany model SCOR (Supply-Chain Operations Referencemodel). W artykule scharakteryzowano...
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THE ROLE OF THE POLISH UNIVERSITIES IN SHAPING A NEW MOBILITY CULTURE - ASSUMPTIONS, CONDITIONS, EXPERIENCE. CASE STUDY OF GDANSK UNIVERSITY OF TECHNOLOGY, CRACOW UNIVERSITY OF TECHNOLOGY AND SILESIAN UNIVERSITY OF TECHNOLOGY
PublicationThe article expresses an idea of the privileged role of universities in the process of shaping the new culture for urban mobility. Mobility management of the academic community is adopted in order to indirectly influence a wider group of the population. The aim of the study was to investigate the situation at the Polish universities and the willingness of their authorities to implement integrated tools to manage the transportation...
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Influence of edge subdivision on the convex domination number
PublicationWe study the influence of edge subdivision on the convex domination number. We show that in general an edge subdivision can arbitrarily increase and arbitrarily decrease the convex domination number. We also find some bounds for unicyclic graphs and we investigate graphs G for which the convex domination number changes after subdivision of any edge in G.
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Shaping the spatial structures of post-socialist cities
PublicationThis paper deals with issues and problems associated with transformation of spatial structures of post-socialist cities. The special attention is paid to the cases of Polish cities and towns and the analysis of their evolution – from the “post-communist structures” to the “cities in the age of globalization”. In the light of this the factors influencing the spatial transformation of these are analyzed. The paper is concluded with...
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Constructive entanglement test from triangle inequality
PublicationWe derive a simple lower bound on the geometric measure of entanglement for mixed quantum states in the case of a general multipartite system. The main ingredient of the presented derivation is the triangle inequality applied to the root infidelity distance in the space of density matrices. The obtained bound leads to entanglement criteria with a straightforward interpretation. The proposed criteria provide an experimentally accessible,...
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Analiza wykorzystania ciepła odpadowego spalin silnika tłokowego do produkcji energii elektrycznej w układach ORC
PublicationArtykuł stanowi analizę możliwości wykorzystania ciepła odpadowego pochodzącego ze spalin tłokowego silnika gazowego firmy General Electric Jenbacher. W artykule zawarto krótki opis dostępnego źródła ciepła, schematy oraz metodę obliczeń, a także wyniki przeprowadzonej analizy. Zaprezentowano również krótki opis korzyści wynikających z zastosowania zaprezentowanego układu.
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Analiza wykorzystania ciepła odpadowego silnika tłokowego do produkcji energii elektrycznej w układach ORC
PublicationArtykuł stanowi analizę możliwości wykorzystania ciepła odpadowego powstającego podczas pracy tłokowego silnika gazowego firmy General Electric Jenbacher. W artykule zawarto krótki opis dostępnego źródła ciepła, schematy oraz metodę obliczeń, a także wyniki przeprowadzonej analizy. Zaprezentowano również krótki opis korzyści wynikających z zastosowania zaprezentowanego układu.
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Practical aspects of design and operation of amphibious craft for rescue purposes
PublicationThe paper presents the selected problems of design and operation of amphibious craft for rescue purposes. The result of research on the amphibious rescue units allowed formulating the general conclusions with respect to the proper selection of the main design parameters, program of model tests and full scale trials for the amphibious craft. The most important design problems related to the water characteristics are presents and...
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Dedicated scheduling of tasks to minimize mean flow time
PublicationThis paper investigates the complexity of scheduling biprocessor tasks on dedicated processors to minimize mean flow time. Since the general problem is strongly NP-hard, we assume some restrictions on task lengths and the structure of associated scheduling graphs. Of particular interest are acyclic graphs. In this way we identify a borderline between NP-hard and polynomially solvable special cases.
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Accelerator of the entrepreneurship: suburbs in the coastal metropolis of GOM
PublicationPolish model of suburban structure is made of variety types of enterprises in different scales, and a range of housing. However this mass of unordered structure with its urban development problems, often leads to the establishment of business and also the development of local entrepreneurship. This article investigates SME sector located in the suburban area of costal metropolis GOM to prove the thesis that the positive effect...
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GPU-Accelerated LOBPCG Method with Inexact Null-Space Filtering for Solving Generalized Eigenvalue Problems in Computational Electromagnetics Analysis with Higher-Order FEM
PublicationThis paper presents a GPU-accelerated implementation of the Locally Optimal Block Preconditioned Conjugate Gradient (LOBPCG) method with an inexact nullspace filtering approach to find eigenvalues in electromagnetics analysis with higherorder FEM. The performance of the proposed approach is verified using the Kepler (Tesla K40c) graphics accelerator, and is compared to the performance of the implementation based on functions from...
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Just Let Me Think: Designing Against Acquired Illiteracy.
PublicationThis article concerns the relatively new problem of illiteracy relating to persons previously being literate, which is caused by too intensive using of so-called digital media (TV, computers, tablets, smartphones, e-book readers, portable media players, etc.). The problem has been observed for several years mainly in countries with high economic and technological development. The widespread use of digital media and the ease of...
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Probing the Magnetic Anisotropy of Co(II) Complexes Featuring Redox-Active Ligands
PublicationCoordination complexes that possess large magnetic anisotropy (otherwise known as zero-field splitting, ZFS) have possible applications in the field of magnetic materials, including single molecule magnets (SMMs). Previous studies have explored the role of coordination number and geometry in controlling the magnetic anisotropy and SMM behavior of high-spin (S = 3/2) Co(II) complexes. Building upon these efforts, the present work...
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Injectable poloxamer/graphene oxide hydrogels with well‐controlled mechanical and rheological properties
PublicationAlthough significant progress has been made in the design and application of injectable hydrogels for biomedical applications, concurrent control of rheological and mechanical properties of injectable hydrogels has remained as an open challenge to the researchers. In this work, we introduce and put into practice a photo‐curable poloxamer (also known as Pluronic)/graphene oxide (Plu/GO) injectable hydrogel with well‐controlled rheological...
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Microwave treatment in waste rubber recycling – recent advances and limitations
PublicationEnvironmentally-friendly microwave heating is increasingly used in polymer chemistry and technology. The selectivity and highly efficiency in the heat transfer present a huge advantage in systems based on recycling, improving their productivity and economic competitiveness. In case of the industrial recycling of waste rubbers, especially end-of-life tires, microwave-induced devulcanization and pyrolysis are nowadays considered...
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Coffee Wastes as Sustainable Flame Retardants for Polymer Materials
PublicationDevelopment of green flame retardants has become a core part of the attention of material scientists and technologists in a paradigm shift from general purpose to specific sustainable products. This work is the first report on the use of coffee biowastes as sustainable flame retardants for epoxy, as a typical highly flammable polymer. We used spent coffee grounds (SCG) as well as SCG chemically modified with phosphorus (P-SCG)...
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Enhanced aging resistance of poly(ε-caprolactone)/brewers’ spent grain composites
PublicationThe presented paper investigated the influence of brewers’ spent grain (BSG) extrusion pa-rameters on the photo-oxidative resistance of poly(ε-caprolactone)-based wood polymer composites. Filler samples characterized by the higher melanoidin content were more efficient in hindering of poly-mer degradation, inhibiting the decomposition of the polymer amorphous phase. As aresult, deteriora-tion of mechanical performance was limited,...
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Flame-Retardant Polymer Materials Developed by Reactive Extrusion: Present Status and Future Perspectives
PublicationThe development of flame retardant polymer materials has two roots, one in materials design, and the other in materials processing. Over recent decades, different types and classes of flame retardant polymer materials have been commercialized to meet safety requirements in the construction, automotive, and coatings industries. In the vast majority of cases, the design and fabrication of new materials presenting low fire hazards...
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Structural and Thermo-Mechanical Properties of Poly(ε-caprolactone) Modified by Various Peroxide Initiators
PublicationThe modification of poly(ε-caprolactone) (PCL) was successfully conducted during reactive processing in the presence of dicumyl peroxide (DCP) or di-(2-tert-butyl-peroxyisopropyl)-benzene (BIB). The peroxide initiators were applied in the various amounts of 0.5 or 1.0 pbw (part by weight) into the PCL matrix. The effects of the initiator type and its concentration on the structure and mechanical and thermal properties of PCL were...
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Study on the Structure-Property Dependences of Rigid PUR-PIR Foams Obtained from Marine Biomass-Based Biopolyol
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A Triplet-learnt Coarse-to-Fine Reranking for Vehicle Re-identification
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Effect of ground tire rubber on structural, mechanical and thermal properties of flexible polyurethane foams
PublicationFlexible polyurethane foams were modified with two kinds of ground tire rubber, untreated and thermo-mechanically reclaimed. A reclamation process was performed in auto-thermal conditions, which reduced the cost of the process and decreased the environmental impact of devulcanization (e.g., emission of gases). The reclamation process was carried out in a continuous manner using a co-rotating twin screw extruder. The foams were...
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Rigid polyurethane foams modified with ground tire rubber - mechanical, morphological and thermal studies
PublicationRigid polyurethane foams, prepared by a single step method, were modified with the two types of ground tire rubber particles, i.e. untreated and thermo-mechanically reclaimed by using a co-rotating twin screw extruder. The foaming process as well as the structure and the physical, mechanical and thermal properties of the resulting foams were investigated. The presence of ground tire rubber decreased the velocity of polymerization....
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Polyurethane/ground tire rubber composite foams based on polyglycerol: processing, mechanical and thermal properties
PublicationDuring the synthesis of rigid polyurethane foams, petrochemical polyol was substituted with polyglycerol, the product of thermo-catalytic polycondensation of waste glycerol, resulting from biodiesel production. Two types of ground tire rubbers, untreated and thermo-mechanically reclaimed, were used to obtain ‘‘green’’ polyurethane-polyglycerol composite foams. Samples were prepared by a single-step method for the ratio of NCO/OH...
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Biopolyols obtained via microwave-assisted liquefaction of lignin: structure, rheological, physical and thermal properties
PublicationThe present study examined the application of polyols obtained via microwave-assisted liquefaction of lignin in the production of rigid polyurethane foam. Lignin was liquefed in crude glycerol and 1,4-butanediol at diferent temperatures (130–170 °C), without a catalyst and using various biomass concentrations (15 and 30 wt%). The physicochemical properties, process yield, and FTIR-based identifcation of the obtained polyols were...
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Wpływ bezhalogenowych związków zmniejszających palność na strukturę oraz właściwości mechaniczne i termiczne elastycznych pianek poliuretanowych otrzymanych z poliglicerolu
PublicationElastyczne pianki poliuretanowe zostały przygotowane metodą jednostopniową z układu dwukomponentowego o stosunku grup NCO/OH wynoszącym 0.9:1. Pianki poliuretanowe poddano modyfikacji grafitem ekspandowanym oraz jego mieszaniną z fosforowym, bezhalogenowym związkiem zmniejszającym palność o nazwie handlowej Fyrol PNX. Scharakteryzowano statyczne i dynamiczne właściwości mechaniczne, morfologię, właściwości termiczne oraz palność...
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Modification of microporous polyurethane elastomers with different types of ash—morphological, mechanical, and thermal studies
PublicationIncorporation of wood ash particles from wood gasification into microporous polyurethane elastomers has been investigated and compared to addition of commercially available microspheres resulting from coal burning. Samples were modified with 3 and 6 wt% of fillers. Structure, mechanical, and thermal properties of obtained elastomers were investigated. Incorporation of both types of ash particles decreased the density of polyurethanes...
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Morfologia, w³aoeciwooeci mechaniczne i termiczne elastycznych pianek poliuretanowych modyfikowanych glinokrzemianami warstwowymi
PublicationWytwarzane z udzia³em poligliceryny elastyczne pianki poliuretanowe modyfikowano za pomoc¹ montmorylonitu sodowego (bentonitu, MMT), mieszaniny bentonitu i bezhalogenowego fosforoorganicznego zwi¹zku zmniejszaj¹cego palnooeæ (Fyrol PNX) oraz, stanowi¹cego nape³niacz hybrydowy, bentonitu modyfikowanego wykorzystywanym uniepalniaczem. Badano mikrostrukturê, w³aoeciwooeci mechaniczne i termiczne modyfikowanych pianek poliuretanowych....
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Morfologia, właściwości mechaniczne oraz palność spienionych materiałów poliuretanowo-poliglicerynowych modyfikowanych grafitem ekspandowanym
PublicationSpienione kompozyty poliuretanowo-glicerynowe modyfikowane grafitem ekspandowanymotrzymano metodą jednostopniową z układu dwukomponentowego, gdzie jako składnik poliolowyzastosowano odpadową poliglicerynę. Scharakteryzowano morfologię, właściwościmechaniczne oraz klasę palności otrzymanych materiałów. Uzyskane wyniki wskazują, żewprowadzenie poligliceryny do matrycy poliuretanowej umożliwia otrzymanie materiałówcharakteryzujących...
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Processing and structure–property relationships of natural rubber/wheat bran biocomposites
PublicationIn this work, wheat bran was used as cellulosic filler in biocomposites based on natural rubber. The impact of wheat bran content [ranging from 10 to 50 parts per hundred rubber (phr)] on processing, structure, dynamic mechanical properties, thermal properties, physico-mechanical properties and morphology of resulting biocomposites was investigated. For better characterization of interfacial interactions between natural rubber...
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Otrzymywanie spienionych materiałów poliuretanowych z wykorzystaniem biomasy celulozowej
PublicationW niniejszej pracy przedstawiono sposób otrzymywania oraz charakterystykę sztywnych pianek poliuretanowych (SPUR) otrzymanych z biopoliolu uzyskanego w wyniku upłynniania biomasy celulozowej frakcją glicerynową. Opisano również sposób otrzymywania biopoliolu (EP1) jego charakterystykę oraz podstawowe właściwości fizyko-chemiczne. EP1 otrzymano przez upłynnienie biomasy celulozowej w surowej glicerynie wykorzystując H2SO4 jako...
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Recycling of Waste Rubber by the Manufacturing of Foamed Polyurethane-Based Composites—Current State and Perspectives
PublicationWorn car tires are disruptive waste, and the issue of their management is crucial for the natural environment. In many countries, the primary method of end-of-life tires utilization is energy recovery. However, more effective and beneficial for the environment is material recycling. Using them for the production of polymer-rubber composites seems to be an auspicious direction of research. Incorporation of ground tire rubber into...
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THE IMPACT OF GROUND TIRE RUBBER TREATMENT ON THE THERMAL CONDUCTIVITY OF FLEXIBLE POLYURETHANE/GROUND TIRE RUBBER COMPOSITES
PublicationWaste car tires are burdensome waste, and their utilization is crucial for the natural environment. In many countries, the primary method of their recycling is energy recovery, performed by simple combustion. However, material recycling is much more effective and significantly more beneficial for the natural environment. It results in the generation of ground tire rubber, which can be used to produce polymerrubber composites. It...
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OIL-ASSISTED THERMO-MECHANICAL RECLAMATION OF GROUND TIRE RUBBER
PublicationNowadays, it is crucial to seek for the methods of by-products and waste utilization, considering both environmental and economic factors. The example of waste material generated in the massive amounts, which requires the attention is ground tire rubber generated during recycling of post-consumer car tires. It can be applied as a filler into different polymer matrices, but to enhance its effectivity proper modifications should...
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The Impact of Ground Tire Rubber Oxidation with H2O2 and KMnO4 on the Structure and Performance of Flexible Polyurethane/Ground Tire Rubber Composite Foams
PublicationThe use of waste tires is a very critical issue, considering their environmental and economic implications. One of the simplest and the least harmful methods is conversion of tires into ground tire rubber (GTR), which can be introduced into different polymer matrices as a filler. However, these applications often require proper modifications to provide compatibility with the polymer matrix. In this study, we examined the impact...
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DETERMINATION OF THE HYDROXYL NUMBER OF GROUND TIRE RUBBER PARTICLES VIA MODIFIED TEST METHOD FOR ISOCYANATE GROUPS
PublicationNowadays, considering the environmental trends and law regulations associated with the circular economy, it is very important to seek for the methods of by-products and waste utilization. The example of such material, which requires the attention and recycling method is ground tire rubber generated during recycling of post-consumer car tires. It can be introduced into various polymer matrices as a filler, but to enhance its effectivity...