Wyniki wyszukiwania - Biblioteka Nauki

1

Vibration damping characteristics of the cork-based composite material in line to frequency analysis

100%

Karpenko M. , Nugaras J.

Journal of Theoretical and Applied Mechanics

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2022

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tom Vol. 60 nr 4

593--602

EN

The conducted research suggests possibility of replacing extruded polystyrene with a renewable cork-based material in laminated composite structures. Different fractions of the cork-based material of a composite laminate have been applied. The composites have been tested employing a hammer-focused vibration method. Conforming to obtained results, the cork-based material of smaller fraction has damping properties similar to those of the extruded polystyrene composite. Integrating cork into the structure of the composite has the opportunity to develop a more eco-friendlier and sustainable product and to improve the adaptive properties of passive control systems used for vibration damping applications operating in the middle and high frequency zones.

2

Korek naturalny. Cz. II. Właściwości i zastosowania

86%

Urbaniak M. , Gołuch-Góreczna R. , Błędzki A. K. , Gajdziński S.

Polimery

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2017

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tom T. 62, nr 6

472--480

PL

Jest to druga część artykułu, w której omówiono wyjątkowe, korzystne fizyczne i mechaniczne właściwości korka naturalnego, wynikające głównie z jego specyficznej struktury komórkowej. Przedstawiono różnorodne sposoby wykorzystania tego materiału w przemyśle i gospodarce, a także jego najbardziej nowoczesne aplikacje w zaawansowanych technicznie technologiach. Zwrócono też uwagę na korzyści ekologiczne wynikające z zastosowania korka.

EN

This is the second part of the article which covers the specific physical and mechanical properties of cork and its important industrial applications. Unique properties of cork resulting, to a large extent, from the features of its cellular structure, give rise to novel, high added-value applications of this material. Attention is also paid to the environmental advantages of using cork.

3

Reaction to fire of an insulating material on the basis of the cork

86%

Mitterova I. , Ruzinska E. , Zachar M. , Sihelska M. , Krajewski K. J.

Annals of Warsaw University of Life Sciences - SGGW. Forestry and Wood Technology

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2014

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tom 87

4

Rheological and deformation behavior of natural smart suspensions exhibiting shear thickening properties

86%

Gürgen S. , de Sousa R. J. A.

Archives of Civil and Mechanical Engineering

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2020

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tom Vol. 20, no. 4

166--173

EN

Shear thickening fluid (STF) is a very interesting and promising material in several application fields where a different mechanical is demanded based on loading rates, like body armor and vibration insulators. Cork is a natural cellular material by excellence, filled with well-known beneficial effects in terms of insulation and also interesting crashworthiness properties. In this work, cork grains of very small size (0.5–1.0 mm) are added to two different shear thickening suspensions, one of them a fully natural water and cornstarch, and the other based on fumed silica and polyethylene glycol. The rheology of these eco-friendly suspensions was investigated and the influences of including cork grains were discussed. In addition, microscopic analyses were carried out to observe the deformations at each component during the shear thickening phenomenon. Cork grains reduce the load-carrying capacity in the suspensions due to the deformable characteristics of cork. For this reason, shear thickening properties are suppressed in the mixtures. Despite this, it is possible to state that viscosity increase in the mixtures leads to strong particle contacts, and thereby resulting in particle deformations in the main constituent powder as well as in the cork additives due to their softer structures.

5

Energy absorption study of aluminium profiles with variety of filling configurations

86%

Bogusz P. , Stankiewicz M. , Sławiński M.

Engineering Transactions

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2017

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tom Vol. 65, iss. 4

543--562

EN

The subject of this paper is research of thin-walled aluminium profiles filled with different materials and subjected to dynamic load. The aim of this study was to determine the crashworthiness capabilities of the tested elements. Such structures can be used as elements minimalising the effects of blast wave load on military vehicles and occupants carried thereon. The blast wave generated during the explosion of explosives, especially improvised explosive devices(IED), under or near a combat vehicle poses a deadly threat to the crew and passengers inside the vehicle. The idea of installing crashworthy structures in a vehicle seat to protect the crew and passengers is not new. It was found useful in aviation, automotive or railway industry. In this paper, circular aluminium profiles of an external diameter of 50 mm and thickness of 2 mm were investigated. They were filled with three kinds of materials: cork, foamed aluminium of low density and foamed aluminium of high density. The dynamic tests were performed on a spring hammer apparatus. The energy absorbing structures and materials used to fill the aluminium profiles were examined separately in static compression tests. The characteristics of force-displacement response of the investigated structures were determined, compared and analysed. The energy absorbing characteristic parameters were obtained and discussed to determine the best option.

6

Cork Oak in the Maamora Forest (Morocco) – Updating its Distribution and Optimizing Cork Productivity for Sustainable Development

86%

Ghazi S. , Ziri R. , Brhadda N. , Chemchaoui A. , Alaoui H. I. , Boukita H. , El Asri B. , Jdi L.

Ecological Engineering & Environmental Technology

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2024

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tom Vol. 25, iss. 1

288--299

EN

In order to optimize cork productivity in the Maamora forest, specifically in the northern part of the A, B, C, D, and E cantons, the study focused on the analysis and updating of the distribution of productive cork oak (Quercus suber L.) stands as well as the evaluation of cork production over the past two decades. For this purpose, the available maps were corrected and updated using GPS data and field surveys between 2019 and 2022. Similarly, a thorough examination of the archives related to cork harvesting from the water and forestry administration was conducted and enriched by data collection during the survey. The obtained results indicate that the productive area is approximately 39% of the total area in the study zone. Simultaneously, statistical data has highlighted significant fluctuations in the annual gross cork production, coupled with a concerning decrease of 21.29% during the second rotation. Indeed, during the second rotation, 30% of the productive area was not harvested, compared to approximately 14% during the first rotation. Similarly, only 59% of the productive area underwent two harvest cycles. Despite these fluctuations, the recorded productivity during the second rotation, at 0.68 stere/hectare/year, remains above the national average. The differences between cantons are also noteworthy, emphasizing the impact of local factors on cork harvesting. In this context, ensuring sustained cork productivity while ensuring the sustainability of vegetal capital against climate change requires the implementation of an adaptive management approach.

7

Optical properties of the cork of stems and trunks of beech [Fagus sylvatica L.]

72%

Pilarski J. , Tokarz K. , Kocurek M.

Polish Journal of Environmental Studies

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2008

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tom 17

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nr 5

773-779

EN

The investigations were carried out on 1-3- and 10-year-old stems and on the trunks of beech. The optical properties measured were: reflectance, absorption and transmittance of irradiation. The reflectance was measured in the bark and the cork, while absorption and transmittance were measured on isolated cork. Reflectance was measured only on the bark of trunks and the range of the investigations was 400-1100 nm. The reflectance of irradiation in the stems increased with increasing wavelength and decreased with the age of stems. In the range 400-700 nm it ranged from 18% in 1-year-old stems to 10% in 10-year-old stems, and reflectance in the trunks was equal to 15%. In the range 700-1100 nm, it ranged from 51% in 1-year-old stems to 36% in 10-year-old stems and in the trunks. Absorption of the cork decreased with increasing wavelength from about 92% in the range 400 nm to about 15% in the range 700 nm, and to 15% in the range 1100 nm. Any distinct influence of stems age on cork absorption was not observed. Transmittance of irradiation increased with increasing wavelength and the age of the stems. In the range 400 nm it was >1% in all age groups of the stems. In the range 700 nm in 1- and 2-year-old stems, it was equal to approximately 45%, and in the 10-year-old ones it amounted to 60%. In the range 700-750 nm, transmittance decreased to about 38% in the bark of 1-3-year-old stems, to 50% in 10-year-old ones and it remained at this level up to 1100 nm.

8

Korek naturalny. Cz. I. Uprawy dębu korkowego, makro- i mikroskopowa morfologia korka

72%

Urbaniak M. , Gołuch-Góreczna R. , Błędzki A. K. , Gajdziński S.

Polimery

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2017

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tom T. 62, nr 5

388--393

PL

Kora dębu korkowego, uprawianego głównie w Portugalii i w krajach zachodniej części basenu Morza Śródziemnego, jest wykorzystywana od ponad 5 tys. lat. Obecnie znajduje szerokie zastosowanie, od naturalnych korków do butelek po elementy z kompozytów w budownictwie, transporcie, a nawet przemyśle kosmicznym, jest strategicznym surowcem dla zrównoważonego rozwoju, nie tylko krajów śródziemnomorskich. W Cz. I artykułu omówiono uprawy dębów korkowych oraz strukturę chemiczną ich kory, a także makro- i mikroskopową morfologię korka naturalnego.

EN

Cork is the bark of the cork oak tree cultivated mainly in Portugal and the Mediterranean region. As amaterial it has been used for more than 5000 years. Nowadays, it is used in multiple applications, from wine bottles to aeronautics and regarded as astrategic material for sustainable development in many countries. The first part of the presented review is focused on cultivation aspects of cork oak trees as well as morphology (at macro- and microscales) and chemical structure of suberin, the main constituent of cork. The honeycomb-like cork structure makes it one of the best natural, renewable, sustainable raw material, which is used all over the world.

9

Zastosowanie kompozytu z rdzeniem korkowym do kabin i zabudów pożarniczych

72%

Kłusak M. , Grygny S.

Modelowanie Inżynierskie

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2017

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tom T. 32, nr 63

72--79

PL

W artykule przedstawiono wykorzystanie przekładki sztywnej typu korek do wytworzenia kompozytu korkowego, który po przeprowadzonych badaniach został wykorzystany do budowy zabudów i kabin samochodów pożarniczych. W opracowaniu kompozytu korkowego przyjęto założenia, że niezmienny był rodzaj osnowy i rodzaj zbrojenia, a zmieniał się rodzaj przekładki i metody wytwarzania. W wyniku przeprowadzonych prób udało się zredukować masę zabudowy, opracować kompozyt korkowy spełniający normy uniepalnienia wg PN-EN 45545-2:2013 oraz wg ECE-R 118 Aneks 6, 7, 8. W artykule zaprezentowano wykorzystanie korka jako materiału wygłuszającego wnętrza kabin samochodów pożarniczych. Przedstawiono również wybrane wyniki badań i ich opracowanie.

EN

The article presents the application of a rigid spacer of cork type to make cork composite. This is used, after testing, in superstructures and cabs of firefighting vehicles. During the study of composite cork it was assumed that the type of matrix and the type of reinforcement remained unchanged, while the type of spacer and methods of production were changing. As a result of the tests we were able to reduce the weight of the superstructure, work out a cork composite that meets the standards of flame retardancy according to PN-EN 45545-2:2013and the ECE-R 118 Appendix 6, 7, 8. The article has described the use of cork as damping material inside the superstructures of firefighting vehicles. Some results of conducted research and their elaboration were presented, too.

10

Diffusion of carbon dioxide through the cork and stomata in lilac

72%

Pilarski J.

Acta Physiologiae Plantarum

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1994

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tom 16

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nr 2

11

Zmniejszanie gęstości płyt wiórowych za pomocą lekkich wypełniaczy

58%

W.O.

Biuletyn Informacyjny Ośrodka Badawczo-Rozwojowego Przemysłu Płyt Drewnopochodnych w Czarnej Wodzie

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2012

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tom 53

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nr 1-2

12

The wood sector in Poland - recovering from economic crisis

51%

Herbec M.

Intercathedra

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2011

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tom 27

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nr 2

EN

The aim of this paper is to evaluate condition of the wood sector in Poland and lines of changes occurring within it on its way to recovery from crisis. The situation which occurred in 2007 on the mortgage credit market in the United States had a bearing on almost every sector of the global economy. As a result, the year 2008 witnessed a decrease in activity in the global economy which was reflected by lower growth rate of GDP and lower growth rate of exports and imports dynamics. The situation of the wood sector in Poland was evaluated based on dynamics of sold production and foreign trade in main wood products, and profitability indices and financial liquidity indicators characterising companies of this sector.

13

Przeglad dyrektyw Unii Europejskiej dotyczacych materialow i wyrobow przeznaczonych do kontaktu z zywnoscia w swietle polskiego ustawodawstwa

29%

Cwiek-Ludwicka K. , Stelmach A. , Jurkiewicz M. , Mazanska M. , Dzbenska H.

Roczniki Państwowego Zakładu Higieny

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1998

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tom 49

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nr 2

121-136

PL

Dokonano analizy Dyrektyw Unii Europejskiej dotyczących materiałów i wyrobów przeznaczonych do kontaktu ze środkami spożywczymi Uwzględniono aktualnie obowiązujące krajowe przepisy prawne regulujące powyższe zagadnienia.

EN

The integration of Poland with the European Community makes the harmonization of Polish legislation necessary. Among numerous Directives, which provisions should be introduced into domestic legislation before Poland enters the European Union, the Directives related to materials and articles intended to contact with food consist a large group. The review and analysis of 17 Directives that appeared up to the end of year 1997 have been done. The list of these Directives is shown in the Table I. The framework Directive 89/109/EEC on the approximation of the laws of the Member States relating to materials and articles intended to come into contact with foodstuffs have been comprehensively disscussed together with the specific Directives concerning the following matters: symbol which should accompany the materials and articles intendet to contact with food: Directive 80/590/EEC; plastics materials: Directive 90/128/EEC with later ammendments provided by the Directives: 90/128/EEC, 93/9/EEC, 95/3/EC and 96/11/EC; vinyl chloride monomer (acceptable limit and analytical method): Directives: 78/142/EEC, 80/766/EEC and 81/432/EEC, regenerated cellulose film - Directives: 93/10/ECC і 93/111/EEC; ceramic articles: Directive 84/500/EEC; testing migration of constituens of plastic materials - Directives: 85/572/EEC and 82/711/EEC with later ammendments: Directives: 93/8/EEC, 97/48/EC, The relevant Polish regulatory provisions concerning the matters related to materials and articles intendet to contact with foodstuffs have also been discussed. The need for harmonization of Polish regulations with the relevant legislation adopted by the Member States of the European Community was emphasized.

14

Dostosowanie do przepisow Unii Europejskiej, dotyczacych materialow, majacych kontakt z zywnoscia: wyzwanie dla krajow Europy Srodkowej i Wschodniej

29%

Montfort J. P.

Żywność, Żywienie a Zdrowie

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1999

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tom 08

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nr 1

26-37