Wyniki wyszukiwania - BazTech

1

Biological properties of nutshell and microcrystalline cellulose (MCC) filled high density polyethylene composites

Boran S., Dizman Tomak E., Dönmez Çavdar A.

Archives of Materials Science and Engineering

|

2016

|

Vol. 78, nr 2

71--77

EN

Purpose: The composites based on natural fibre and wood can be destroyed by fungi attack, even the lignocellulosic materials were used as filler in hydrophobic thermoplastic matrix. The aim of this study was to investigate the effect of microcrystalline cellulose (MCC) and nutshell fibre content on decay resistance of natural fibre composites. Design/methodology/approach: Half of the composite samples were immersed in water for 60 days and then incubated by fungi to investigate the leaching effect on biological resistance. Furthermore, water absorption rate and thickness swelling of samples were determined during water immersing. For this purpose, total nine thermoplastic composites filled different MCC rate (5%, 10% and 15%) and nutshell content (30%) were produced. Decay test were conducted by using a white rot fungus–Trametes versicolor, and a brown rot fungus–Tyromyces palustris, according to EN 113 standard. Findings: Based on findings from this study, weight loss, water absorption rate and thickness swelling correlated with lignocellulosic content in composites. Samples exhibited less than 1% weight loss in decay test and excellent biological resistance against testing fungi. Research limitations/implications: Weight loss (%) and moisture content (%) values of MCC-nutshell HDPE composites after Tyromyces palustris and Trametes versicolor attack were found under 3% and 20%, respectively. Low weight loss values obtained in the study are supposed to be related with the low moisture content. Originality/value: There is not a study dealing with the decay resistance of WPCs produced by a combination of nutshell and MCC fibres. In addition, there is not a substantial study on the effects of MCC/plastic ratio for decay performance of WPCs contained nutshell after long-term leaching test.

2

Perceptually Correlated Parameters of Musical Instrument Tones

Beauchamp J. W.

Archives of Acoustics

|

2011

|

Vol. 36, No. 2

225-238

EN

In Western music culture instruments have been developed according to unique instrument acoustical features based on types of excitation, resonance, and radiation. These include the woodwind, brass, bowed and plucked string, and percussion families of instruments. On the other hand, instrument performance depends on musical training, and music listening depends on perception of instrument output. Since musical signals are easier to understand in the frequency domain than the time domain, much effort has been made to perform spectral analysis and extract salient parameters, such as spectral centroids, in order to create simplified synthesis models for musical instrument sound synthesis. Moreover, perceptual tests have been made to determine the relative importance of various parameters, such as spectral centroid variation, spectral incoherence, and spectral irregularity. It turns out that the importance of particular parameters depends on both their strengths within musical sounds as well as the robustness of their effect on perception. Methods that the author and his colleagues have used to explore timbre perception are: 1) discrimination of parameter reduction or elimination; 2) dissimilarity judgments together with multidimensional scaling; 3) informal listening to sound morphing examples. This paper discusses ramifications of this work for sound synthesis and timbre transposition.

3

Assessment of the influence of magnesium content on the shape and amount of graphite precipitation in spheroidal cast iron manufactured by Metal-Odlew s.c.

Orłowicz W., Tupaj M., Mróz M., Guzik E., Nykiel J., Zając A., Piotrowski S.

Archives of Foundry Engineering

|

2009

|

Vol. 9, iss. 1

117-120

EN

The study presents the influence of time on cast iron spheroidisation, modification of the magnesium content in the alloy, and the influence of the magnesium content on the shape and number of graphite precipitations. For one particular set of production conditions, it was observed that 17 minutes after completing the modification and spheroidisation procedure, the magnesium content had decreased from 0.070% to 0.040%. This resulted in a decrease in the graphite precipitation shape index Ss from 0.081 to 0.067, as well as a decrease in the average number of graphite precipitations NA from 568 mm-2 to 305 mm-2.

4

On some exponential decay estimates for porous elastic cylinders

Chirita S.

Archives of Mechanics

|

2004

|

Vol. 56, nr 3

233-246

EN

In this paper we introduce two new cross-sectional measures for studying the spatial behaviour of the solutions in elastostatics of the porous cylinders. This allows us to extend the range of applicability of the estimates describing the Saint-Venant's decay behaviour of enlarged classes of porous materials.

5

Modelowanie emisji biogazu ze składowisk odpadów komunalnych. Część 1. Podstawy modelowania, analiza wybranych modeli i zakresy stosowanych parametrów

Gaj K., Cybulska H.

Chemia i Inżynieria Ekologiczna

|

2002

|

Vol. 9, nr 1

91-100

PL

Przedstawiono przegląd i analizę znanych modeli emisji biogazu ze składowisk. Omówiono rodzaje niezbędnych danych wejściowych oraz zakresy zmienności stosowanych w nich parametrów. Wykazano potrzebę opracowania prostej, inżynierskiej metodyki obliczania produktywności gazowej dla typowych warunków składowisk odpadów komunalnych.

EN

Overview and analyse of known models of the biogas emission, some kinds of needful input data and ranges of variations of applied parameters were presented. It was shown, that is a requirement of simply engineering computing method of biogas productiveness for typical conditions of municipal landfills.

6

Niektóre właściwości optyczne kwasów fulwowych, hymatomelanowych i huminowych

Matysik A.

Inżynieria Środowiska / Akademia Górniczo-Hutnicza im. S. Staszica w Krakowie

|

2000

|

T. 5, z. 1

221-224

PL

Badania przedstawione w niniejszej pracy nawiązują do tematyki badań nad substancjami próchnicznymi rozpuszczalnymi w alkaliach. Celem pracy jest znalezienie różnic we właściwościach optycznych alkalicznych roztworów rozpuszczalnych frakcji próchnicznych. Poszczególne frakcje próchniczne otrzymano poprzez zastosowanie ekstrakcji próbki glebowej odpowiednimi roztworami, a pomiary absorbancji wykonano na aparacie GBC UV-VISible Cintra 10/20/40.

EN

The researches presented in this paper are related to the topic of researches on decay substances soluble in basies. The object of these researches is to find the differences in optical properties of the alkaline solutions of decay substances soluble fractions. Extraction using adequate solutions was performed to obtain separate fractions of decay substances. The absorbance was measured on GBC UV-VISible Cintra 10/20/40 apparatus.

7

Nowoczesne trendy utylizacji odpadów

Ambroziewicz K.

Ekologia i Technika

|

1998

|

R. 6, nr 6

180-183

EN

Until now, the most often appleid method of getting rid of municipal has been waste disposal by dumping. However, it should be taken into consideration that the dumping sites will be overfilled and construction of the ones meets more and more social constraints. New trends in waste management are interlinked with the waste energy rocovery. The new technologies consisting in decay of the biological mass contained in the wastes are developed and they are not based on the direct waste burning but they are commonly known composting methods as well as new biotechnical methods.