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Wyświetlanie 1-10 z 43
Tytuł:
Assessment of the resistance to external factors of low-density polyethylene modified with natural fillers
Autorzy:
Głogowska, K.
Majewski, Ł.
Gajdoš, I.
Mitaľ, G.
Powiązania:
https://bibliotekanauki.pl/articles/102811.pdf
Data publikacji:
2017
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
natural filler
low-density polyethylene
injection molding
Opis:
The study reports the results of investigation of basic processing and thermal properties of low-density polyethylene modified with two types of natural filler: wheat bran and pumpkin seed hulls, their content ranging from 5% to 15% relative to the matrix. In addition, physical properties of the produced granulates are determined, i.e. the relationship between their density and the applied contents of the tested fillers. Furthermore, the study reports the results concerning longitudinal shrinkage, abrasion resistance and cold water absorption of injection molded tensile specimens.
Źródło:
Advances in Science and Technology. Research Journal; 2017, 11, 4; 35-40
2299-8624
Pojawia się w:
Advances in Science and Technology. Research Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Recycling of Coal Ash in Production of Low Density Masonry Unit
Autorzy:
Özgül, N.
Savaşçin, M.
Özkan, İ.
Powiązania:
https://bibliotekanauki.pl/articles/1030101.pdf
Data publikacji:
2017-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
coal ash
recycling
low density
masonry unit
Opis:
Coal ash is a residue that is created when coal is burned by power plants to produce electricity. Coal ash is one of the largest types of industrial waste and causes environmental pollution. On the other hand, coal ash is potentially a valuable source of minerals, including SiO₂, Al₂O₃, CaO, MgO, Fe₂O₃, Na₂O and K₂O. This study aims to recycle the coal ash in production of low density masonry unit. Coal ash was characterized by chemical and X-ray diffraction analyses. The batches containing different ratios of coal ash and a brick making clay were prepared and shaped by cold pressing. The pressed samples were fired at 1050 and 1100°C. The physical properties such as water absorption, apparent porosity, linear shrinkage, and bulk density were determined. Microstructural observations were performed by using scanning electron microscopy. Based on the technological characteristics; it was observed that low density masonry units can be produced by using coal ash. This study supports the responsible recycling of coal ash by distinguishing beneficial use from disposal.
Źródło:
Acta Physica Polonica A; 2017, 132, 3; 430-432
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Kinetic analysis of LDL apoB transport and metabolism in non-steady states
Autorzy:
Weryński, A.
Nahorski, Z.
Angelin, B.
Berglund, L.
Eriksson, M.
Powiązania:
https://bibliotekanauki.pl/articles/206021.pdf
Data publikacji:
2000
Wydawca:
Polska Akademia Nauk. Instytut Badań Systemowych PAN
Tematy:
biocybernetyka
apheresis
kinetic modelling
low density lipoprotein (LDL)
Opis:
In this paper a novel kinetic analysis is used for evaluation of the low density lipoprotein (LDL) apoB fractional catabolic rate (FCR) after LDL apheresis which creates a nonsteady state. The formulae for calculation of FCR, and LDL rate of appearance (Ra) as functions of time have been derived. Calculations for one normal and one familial hypercholesterolemic (FH) subjects showed that FCR as well as Ra exhibited variations which can be attributed to the circadian rhythm in LDL metabolism. LDL apheresis had a little impact on both Ra and FCR in normal as well as in FH subjects. However, Ra in FH subject was found to be much higher than - that in the normal subject.
Źródło:
Control and Cybernetics; 2000, 29, 1; 405-425
0324-8569
Pojawia się w:
Control and Cybernetics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Low market density lines for ERTMS regional system
Autorzy:
Białoń, A.
Gradowski, P.
Powiązania:
https://bibliotekanauki.pl/articles/393573.pdf
Data publikacji:
2009
Wydawca:
Polskie Stowarzyszenie Telematyki Transportu
Tematy:
ERTMS
linie o małej gęstości
low density lines
Opis:
The paper presents technical and formal aspects of the development and implementation of the ERTMS Regional. The main purpose of building the ERTMS Regional system is to create an ERTMS-based system which is maximally fitted to low-density lines. This paper presents differences between the specifications of ERTMS and ERTMS Regional systems. The article includes a technical description as well as the principles of ERTMS Regional, a description of the first stage of implementation, as well as an analysis of possible implementation of this system in Poland.
Źródło:
Archives of Transport System Telematics; 2009, 2, 2; 37-40
1899-8208
Pojawia się w:
Archives of Transport System Telematics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Were the oasis-cities of the southern branch of the Silk Road in Tarim Basin, China, dispersed urban complexes?
Czy miasta południowej odnogi Szlaku Jedwabnego w kotlinie Tarim w Chinach były rozproszonymi zespołami miejskimi?
Autorzy:
Hanus, Kasper
Powiązania:
https://bibliotekanauki.pl/articles/27312793.pdf
Data publikacji:
2021-12-30
Wydawca:
Uniwersytet im. Adama Mickiewicza w Poznaniu
Tematy:
Silk Roads
low-density urbanism
agro-urban landscape
Xinjiang
Opis:
This article reinterprets the urban pattern of the oases of southern Tarim Basin, which flourished in the first half of the first millennium C.E. using the dispersed urban complexes framework. Disperse urban centre, also known as a low-density urban complex, is a site that had an urban function, but its morphology was much different from compact cities of, for example, China or mediaeval Europe. Low-density urban complexes, like Tikal in Mesoamerica or Angkor in South-East Asia, despite their distinct urban functions, had the cityscape consisting of intermingled monumental agriculture, water management features and agricultural field. Thus, the oasis-cities of southern Tarim Basin were different from compact urban centres of neighbouring China and western Central Asia and showed some similarities to complexes like Tikal and Angkor. This article evaluates if those sites can be associated with low-density urbanism. Three selected sites, 尼雅 [Niya], 米兰 [Miran] and 樓蘭 [Loulan], have been evaluated for the presence of characteristic associated with low-density urbanism: dispersed monumental architecture, large scale anthropogenic landscapes modifications, and pattern of alternating housing clusters and agricultural fields. This can affect our understating of both the understanding of urbanism in the region and low-density urbanism on the global scale.
Źródło:
Folia Praehistorica Posnaniensia; 2021, 26; 89-121
0239-8524
2450-5846
Pojawia się w:
Folia Praehistorica Posnaniensia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wybrane aspekty oznaczania gęstości polietylenu małej gęstości
Selected aspects of low-density polyethylene density measurements
Autorzy:
Liszyńska, B.
Zieliński, J.
Marszałek, G.
Kowalska, L.
Kościańczuk, D.
Powiązania:
https://bibliotekanauki.pl/articles/278167.pdf
Data publikacji:
2015
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Inżynierii Materiałów Polimerowych i Barwników
Tematy:
polietylen małej gęstości
polimery termoplastyczne
gęstość
low-density polyethylene
thermoplastic polymers
density
Opis:
Określono wpływ sposobu przygotowania próbek do oznaczeń na wartość gęstości polietylenu malej gęstości oraz podjęto próbę korelacji tych wielkości z wielkościami wyliczonymi na podstawie badań DSC. Przedmiot badań stanowiło osiem gatunków PE-LD. Gęstość oznaczano metodą zanurzeniową stosując próbki przygotowane w dwojaki sposób. Ustalono, że sposób kondycjonowania próbki ma widoczny, ale nieznaczny wpływ na wartość gęstości. Nie uzyskano zadowalającej korelacji pomiędzy wartościami gęstości oznaczonymi metodą zanurzeniową a wyliczonymi na podstawie DSC.
The influence was determined of the preparation of samples for the measurements on the density of low-density polyethylene and an attempt was made to correlate these values with density values calculated basing on DSC studies. The subject of this research were eight types of LDPE. The density was measured using immersion method for samples prepared in two ways. It was determined that the method of sample preparation has an observable but small influence on the measured value of density. No acceptable correlation was found between the values of density measured using the immersion method and the values calculated basing on DSC.
Źródło:
Przetwórstwo Tworzyw; 2015, T. 21, Nr 4 (166), 4 (166); 333-336
1429-0472
Pojawia się w:
Przetwórstwo Tworzyw
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Possibilities of Using Low-Density C-C Composites for Thermal Protection of Small Unmanned Aerial Vehicles
Autorzy:
Yanko, Taras
Datsenko, Roman
Karpenko, Hanna
Powiązania:
https://bibliotekanauki.pl/articles/36818980.pdf
Data publikacji:
2023
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Lotnictwa
Tematy:
carbon-carbon composite material
low-density
fibre
laser weapon
carbonisation
Opis:
The study demonstrates the possibilities of using, as well as the features associated with the use of, unmanned aerial vehicles (UAVs) for military and peaceful purposes. Information is provided on the need to use components that would contribute towards ensuring thermal protection against modern laser weapons. The requirements for such materials are given, according to the field of application of the UAV. An analysis of the available materials that can be used to create thermal protection of UAVs against laser weapons is provided. The thermophysical characteristics of various materials are presented. The work presents technological features of production and properties of low-density carbon-carbon composite materials (CCCM). It is proposed to consider the prospects of using CCCM materials for not only the UAV structural components but also other purposes.
Źródło:
Transactions on Aerospace Research; 2023, 2 (271); 45-57
0509-6669
2545-2835
Pojawia się w:
Transactions on Aerospace Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Properties of moldings prepared from LDPE-pumpkin seed hulls blend
Autorzy:
Głogowska, K.
Sikora, J.
Dulebova, L.
Powiązania:
https://bibliotekanauki.pl/articles/102641.pdf
Data publikacji:
2017
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
natural filler
low-density polyethylene
pumpkin seed hulls
injection molding
Opis:
In recent decades, standard polymer blends for different applications have been more and more often replaced by blends containing raw materials. The use of natural materials as filler in thermoplastics brings both economic and environmental benefits. The use of a given vegetable filler depends on the geographic location and natural occurrence of the vegetables in a given geographic region. In Poland, for instance, the pumpkin is one of such vegetables. They are used for producing oil which is pressed from pumpkin seeds. Pumpkin seeds are then collected, dried and purified to produce waste material in hull form. Particles of ground pumpkin seed hulls with varying sizes and weight-in-weight concentration ranging from 0% to 20% relative to the matrix are used as filler in low-density polyethylene. Pumpkin seed hulls are ground and sieved. Four fractions of hulls with different particle sizes are produced: <0.2 mm, 0.2-0.4 mm, 0.4-0.6 mm, 0.6-0.8 mm. The paper reports the results of investigation of the mechanical properties, i.e., strength properties determined by static tensile testing and hardness measurement, of injection molds produced at constant processing parameters. In addition, the cross sections of the obtained products are subjected to microscopic examination. Relationships are determined between tensile modulus, maximum tensile stress, tensile stress at yield, maximum tensile strain, tensile strain at yield as well as Shore hardness and weigh-in-weight concentration of the powdered natural filler and its grain sizes. Finally, relevant conclusions are drawn.
Źródło:
Advances in Science and Technology. Research Journal; 2017, 11, 4; 318-325
2299-8624
Pojawia się w:
Advances in Science and Technology. Research Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Environmental aspects of the production and use of autoclaved aerated concrete with low density
Autorzy:
Rudchenko, Dmitry
Serdyuk, Vasyl
Powiązania:
https://bibliotekanauki.pl/articles/2091568.pdf
Data publikacji:
2022
Wydawca:
Politechnika Lubelska. Wydawnictwo Politechniki Lubelskiej
Tematy:
greenhouse gases
energy saving
construction
autoclaved aerated concrete
low density
Opis:
The purpose of the article is to investigate the state of carbon dioxide emissions generated as a result of wall materials production and the construction industry as a whole. The paper provides a comparative analysis of housing construction in Ukraine and in some CIS countries. Against the background of the indicators of low housing availability and low relative volumes of housing construction, the issue of high energy consumption remains valid. The absolute and relative volumes of greenhouse gas emissions from economic activity of the population of Ukraine are given. The projected consequences for Ukraine from continued CO2 emissions on the same level and temperature rise are estimated. It is deemed that the most suitable wall material for countries with emerging economies is autoclaved aerated concrete (AAC); since it is a structural and thermal insulating material, it can solve the problem of housing construction. The paper shows the key priority of low energy consumption and makes emphasis on lowering the density of the produced aerated concrete, reducing mineral additives and cement production expenses.
Źródło:
Budownictwo i Architektura; 2022, 21, 1; 19--30
1899-0665
Pojawia się w:
Budownictwo i Architektura
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Lightweight particleboards - manufacturing modification using a blowing agent from the group of bicarbonates
Autorzy:
Bednarczyk, Dominika
Boruszewski, Piotr
Powiązania:
https://bibliotekanauki.pl/articles/2171742.pdf
Data publikacji:
2022
Wydawca:
Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
Tematy:
low density
lightweight particleboard
blowing agent
sodium bicarbonate
phenolic resin
Opis:
Lightweight particleboards - manufacturing modification using a blowing agent from the group of bicarbonates. Although the low-density particleboards have grown in popularity, due to their facilitated transportation and a lower mass in the assembled finished products, there is still certain constraints in their use caused by limited mechanical properties. These obstacles may be overcome by the mechanism of foaming the polymers that bind wood particles in the boards’ structure. The aim of this study was to determine the possibility of using sodium bicarbonate as a blowing agent of phenolic resin used for bonding wood particles in the technology of lightweight particleboards. It was found that the addition of sodium bicarbonate in the amount of 5% in relation to the dry weight of the phenolic resin significantly increase the internal bond strength of the manufactured particleboards.
łyty wiórowe o obniżonej gęstości - modyfikacja wytwarzania przy użyciu poroforu z grupy wodorowęglanów. Pomimo tego, że płyty wiórowe o obniżonej gęstości zyskują na popularności, ze względu na ułatwiony transport i niższą masę gotowych produktów, nadal istnieją pewne utrudnienia w ich zastosowaniu, spowodowane niedostatecznymi właściwościami mechanicznymi. Ograniczenia te mogą zostać zminimalizowane dzięki zastosowaniu mechanizmu spieniania żywicy wiążącej cząstki drewna w płytach wiórowych. Celem pracy było określenie możliwości zastosowania wodorowęglanu sodu jako poroforu żywicy fenolowej stosowanej do zaklejenia cząstek drewna w technologii lekkich płyt wiórowych. Stwierdzono, że dodatek wodorowęglanu sodu w ilości 5% w stosunku do suchej masy żywicy fenolowej istotnie zwiększa wytrzymałość na rozciąganie prostopadle do płaszczyzny płyty w wytworzonym materiale.
Źródło:
Annals of Warsaw University of Life Sciences - SGGW. Forestry and Wood Technology; 2022, 117; 55--62
1898-5912
Pojawia się w:
Annals of Warsaw University of Life Sciences - SGGW. Forestry and Wood Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
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