Search results for "WOOD"

Carbon and nitrogen stabile isotope ratio and heavy metals in Leccinum aurantiacum in a hybrid aspen plantation in agricultural land

2020

Edible mycorrhizal fungi can be harvested in the fourth year after establishment of a hybrid aspen plantation in previous agricultural land at hemiboreal conditions. It is important to understand the role of fungi in element cycling at the ecosystem level as well as the amounts of elements, including heavy metals, that are accumulated in fruitbodies of edible fungi in the context of food safety. Therefore we evaluated the carbon and nitrogen stable isotope ratio and content of heavy metals (Cr, Pb, Mn, Ni, Cd, Cu and Zn) in Leccinum aurantiacum (Bull.) Gray in a juvenile hybrid aspen (Populus tremuloides Michx. × Populus tremula L.) plantation in agricultural land initially fertilised with …

DEGRADATION OF MATER-BI /WOOD FLOUR BIOCOMPOSITES IN ACTIVE SEWAGE SLUDGE

2009

The mechanical properties of Mater-Bi® are, in general, not adequate for certain applications and the addition of a filler is therefore necessary. Among the different fillers, natural fibres are particularly interesting because they potentially allow improving the performance of the material without compromising its biodegradability. In order to improve the basic mechanical properties of a Mater-Bi grade and to obtain a new, fully biodegradable material, wood flour based composites were prepared by different processing methods. To simulate actual and not laboratory bacterial attack on the prepared materials, in this work we studied the biodegradation of the composites in a real active sewag…

Accelerated weathering of polypropylene/wood flour composites

2008

Abstract Wood–plastic composites (WPCs) have received increasing attention during the last decades, because of many advantages related to their use. Some of their main applications are represented by outdoor furnishing and decking; therefore, it is important to assess their behaviour under UV exposure. In this work, polypropylene/wood flour composites were prepared and their resistance to photooxidation investigated. The composites were prepared by extrusion and compression moulding, and were subjected to mechanical tests, FTIR analysis and molecular weight measurements. The results showed that the composites retained a higher fraction of the original mechanical properties after accelerated…

Effect of the processing on the properties of biopolymer based composites filled with wood flour

2008

Wood-polymer composites (WPCs) are well known today in the field of industrial applications, because of several advantages they can grant if compared with mineral filler-polymer composites. These advantages regard the low cost of wood based fillers, the reduced specific weight, the lower hazards for production workers in case of inhalation, the special aesthetic features, environmental issues. The scientific literature reports studies regarding polymer matrices like, for instance, polyethylene and polypropylene, in combination with several natural-organic fillers. However, a limit of these composites is represented by the fact that there is not a full biodegradability: this, in fact, regard…

Jacqueline Woodson’s narrative style in The Other Side: An African American picture book for children

2012

The Other Side (2001) is a children’s story with multicultural characters and themes that can be regarded as an aesthetic exploration of the human experience in the process of the acquisition of knowledge. Following the Black Arts Movement, Jacqueline Woodson’s work portrays many of the issues that are present in the real world but seldom appear in children’s literature, such as racial division or interracial relationships. Using the metaphor of a fence, this African American author reveals issues of loneliness and friendship, inclusion and exclusion, and the overcoming of prejudice and segregation through the wisdom of Clover and Annie, an African American and a white girl, who become frie…

Leratiomyces ceres (Strophariaceae, Basidiomycota), new to Poland

2019

<em>Leratiomyces ceres</em>, an extra-European species hitherto unknown in Poland, was identified in a public park in Rybnik City (SW Poland). The first Polish collections of the fungus were studied using macroscopic and microscopic features. A brief description and illustration of the species, based on Polish specimens, are presented. The ecology and characteristics distinguishing <em>L. ceres</em> from related <em>Leratiomyces</em> species are also discussed.

Hardy–Littlewood Inequality

2019

Functions of One Variable

2019

A classical result of Fatou gives that every bounded holomorphic function on the disc has radial limits for almost every point in the torus, and the limit function belongs to the Hardy space H_\infty of the torus. This property is no longer true when we consider vector-valued functions. The Banach spaces X for which this property is satisfied are said to have the analytic Radon-Nikodym property (ARNP). Some important equivalent reformulations of ARNP are studied in this chapter. Among others, X has ARNP if and only if each X-valued H_p- function f on the disc has radial limits almost everywhere on the torus (and not only H_\infty-functions). Even more, in this case each such f has non-tange…

IL RECUPERO DELLE STRUTTURE LIGNEE DEL PORTICO PRINCIPALE DEL DUOMO DI MONREALE

2009

SCIENTIFIC STUDIES FOR THE RESTORATION OF A WOOD PAINTING OF THE GALLERIA INTERDISCIPLINARE REGIONALE DELLA SICILIA - PALAZZO MIRTO DI PALERMO

2016

The Ritratto muliebre, referring to Venus, is a panel painting, oil on wood, attributed to unknown artist and probably dated to the second half of 16th century, today conserved in the Galleria Interdisciplinare Regionale della Sicilia—Palazzo Mirto of Palermo. The aim of this research was to assess the techniques used to decorate the wooden painting and to verify the state of conservation of the artwork's materials but also to identify the previous treatments. This study was the essential condition to plane and perform the correct restoration. For this reason, an integrated analytical approach based on the use of non-invasive and micro-invasive techniques was used, with the aim to obtain a …