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Wyświetlanie 1-15 z 72
Tytuł:
Use of basalt fibers for soil improvement
Autorzy:
Ndepete, C.
Sert, S.
Powiązania:
https://bibliotekanauki.pl/articles/1068236.pdf
Data publikacji:
2016-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
83.80.Nb
Opis:
Soil reinforcement with natural and man-made fibers is one of the techniques to improve a number of mechanical and physical properties of soils. Although basalt originated fibers are currently being used for concrete, it is not an easy task to find a source in literature concerning the use of basalt fibers for soil improvement. In this study, basalt fibers have been used for this new aim. This study is an investigation into evaluation of the increase in soil strength, which is reinforced, in different percentages, by basalt chopped fibers. A silty soil sample has been chosen for this study and has been mixed, with 6, 12, and 24 mm long basalt fiber at varying contents. The unconsolidated undrained triaxial tests show that the addition of 24 mm long fibers into soil gives the maximum improvement in strength and the optimum fiber content (by dry weight of soil) is 1.5%.
Źródło:
Acta Physica Polonica A; 2016, 130, 1; 355-356
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Tracking Underwater Noise Sources with the Use of a Passive Method
Autorzy:
Gloza, I.
Buszman, K.
Józwiak, R.
Powiązania:
https://bibliotekanauki.pl/articles/1400098.pdf
Data publikacji:
2013-06
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
43.30.Nb
Opis:
It is possible to track a source of noise by determining the intensity of sound that informs about the sound energy flow direction. One of the methods of determining the sound intensity of acoustic signals is the so-called gradient method in which the pressure is measured with the use of two hydrophones placed close to each other. Tetrahedral antenna consists of four hydrophones spaced at regular tetrahedron vertices so that distances between hydrophones are the same. The tetrahedral antenna determines six virtual points in the middle of each edge and allows using sound intensity calculation algorithm to determine the noise source bearing. In our experiment, the antenna was located 23 meters below the sea surface and a source of noise was moving over it. The object that was moving along a straight line with a specific course was equipped with a GPS receiver. This allowed comparison of the obtained targeting results with the real track of moving object. The paper presents the object tracking algorithm which was implemented in the MATLAB environment as well as some of the results of research carried out on passive source noise tracking.
Źródło:
Acta Physica Polonica A; 2013, 123, 6; 1090-1093
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Synthesis and Characterization of Carbon Nanotubes Decorated with Gold Nanoparticles
Autorzy:
Dobrzanski, L.
Pawlyta, M.
Krzton, A.
Liszka, B.
Tai, C.
Kwasny, W.
Powiązania:
https://bibliotekanauki.pl/articles/1536456.pdf
Data publikacji:
2010-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.07.Nb
Opis:
In presented work we report results of simple and viable method for producing Au/CNT composites. Chemical composition and crystallographic structure of the Au/CNT composites was confirmed by X-ray diffraction measurements, while transmission and scanning electron microscopy were used to characterize the morphology of nanocrystals as well as the distribution of nanocrystals in the composite. The obtained particles with relatively small diameter (less than 9 nm) were found to be spatially well dispersed on the carbon nanotubes. The density of attached Au-nanoparticles is not sufficient, and cannot be improved by simple increasing gold loading.
Źródło:
Acta Physica Polonica A; 2010, 118, 3; 483-486
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Experimental Investigation of Underwater Noise Produced by Ships by Means of Sound Intensity Method
Autorzy:
Gloza, I.
Powiązania:
https://bibliotekanauki.pl/articles/1537419.pdf
Data publikacji:
2010-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
43.30.Nb
Opis:
Ship noise is a one of most important part of the field of the acoustic environment. Its reduction and monitoring is a very important aspect in the performance of underwater acoustic systems and in the habitability of the vessel for the crew and passengers. In naval operations the noise radiated by a ship is also dominant source of information for underwater sonar weapons systems. Sound intensity is the vector quantity which informs us about the sound power flux, the direction of the sound source. The probe tracks the position of source and at the same time, measures the component of sound-intensity vector. Generally only one component of vector sound intensity was measured, perpendicular to a given measurement surface. The sound intensity of a moving source includes effects such as flow noise that are not present when the source is stationary. The accuracy of measuring acoustic intensity using two closely spaced hydrophones by correcting the phase mismatch error by measuring the transfer function between the two detector systems at the same time was examined. The two measuring hydrophone instrumentation systems were earlier carefully calibrated. Our results have been obtained using digital methods, where was used PULSE B&K measuring system.
Źródło:
Acta Physica Polonica A; 2010, 118, 1; 58-61
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Identification Methods of Underwater Noise Sources Generated by Small Ships
Autorzy:
Gloza, I.
Powiązania:
https://bibliotekanauki.pl/articles/1504203.pdf
Data publikacji:
2011-06
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
43.30.Nb
Opis:
In this work we were interested in the use for the localization of the ship noise sources in the water environment. Particular interest was dedicated to identifying of narrow band contribution to the total spectra of the ship hydroacoustic noise. The analyses were performed in time and frequency domain. The diesel engine, the electric motor and the propeller have notably been studied and the different frequencies connected to these devices have been listed. Extensive measurements were made of the underwater radiated noise of K1 and K2, small vessels powered by an electric and diesel engines. The discrete Fourier transform and the short time Fourier transform and sound intensity method were used for a precise analysis. The coherence function was also performed to associate each component of underwater noise with the vibrating part of the engine, which generates it. The measurement results obtained here have been later analyzed and a criticism of each method has been done, focusing on its advantages in the field of the identification of the noise sources.
Źródło:
Acta Physica Polonica A; 2011, 119, 6A; 961-965
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Evaluation of the use of M2M-type NB-IoT and LTE technologies for maritime communication systems
Autorzy:
Gajewski, Sławomir
Czapiewska, Agnieszka
Gajewska, Małgorzata
Powiązania:
https://bibliotekanauki.pl/articles/32917849.pdf
Data publikacji:
2023
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
NB-IoT maritime solutions
NB-IoT coverage at sea
NB-IoT performance
sea propagation loss
CE2R
CE3R
Opis:
The development of IoT (the Internet of Things) wireless transmission opens a new era in communication systems. In the next years, the development and implementation of IoT systems will be very dynamic. It can be seen that the solutions of LTE – NB-IoT (Long Term Evolution – Narrowband IoT) transmission devices are implemented in a wide range of terrestrial solutions, e.g. smart grids. This paper aims to analyse the possibility of the use of NB-IoT technology for maritime communication applications and partially, for some maritime safety solutions, based on signal coverage analysis at sea. An interesting approach is the comparison of the results of NB-IoT coverage to the classic cellular LTEbased communication systems. Proposed solutions are based on the practical implementation of a designed specialised data concentrator with implemented gateway and radio modems, for both NB-IoT technology as well as LTE. In the paper, analyses of radio link budget and propagation loss models for sea environment are presented. The coverage analysis is based on real measurements of the efficiency of transmissions using wireless modems implemented in the developed data concentrator.
Źródło:
Polish Maritime Research; 2023, 1; 126-134
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Polerowanie elektrolityczne stopu Ti6Al7Nb
Electropolishing of Ti6Al7Nb alloy
Autorzy:
Łyczkowska, E.
Chlebus, E.
Powiązania:
https://bibliotekanauki.pl/articles/99218.pdf
Data publikacji:
2013
Wydawca:
Politechnika Śląska. Katedra Biomechatroniki
Tematy:
Ti6Al7Nb
elektropolerowanie
implant
Ti-6Al-7Nb
electropolishing
Opis:
This paper presents review of methods for treatment of Ti6Al7Nb alloy surfaces which may be used as implants. Electro-chemical polishing is a process of improving micro smoothness and material brightness by anodic dissolving of the substrate in an electrolyte. Samples were electropolished in 2 electrolytes consisting of H₂SO₄, HF and org. additives. Ti6Al7Nb details after electrochemical polishing get better corrosion resistance and excellent visual effects. The roughness after EP was 0,08-0,13 Ra.
W artykule omówiono właściwości stopu Ti-6Al-7Nb, jego zastosowanie w implantologii oraz sposoby obróbki powierzchni poprzez obróbkę mechaniczną oraz elektrolityczną. Przedstawiono wyniki elektropolerowania próbek w kąpieli składającej się z kwasu siarkowego(VI), kwasu flurowodorowego, acetanilidu oraz w kąpieli składającej się z kwasu metanosulfonowego i kwasu etidronowego. Przedstawiono również wpływ mechanicznej obróbki przed elektrolitycznym polerowaniem na jakość powierzchni otrzymywanych elementów. Po polerowaniu elektrolitycznym chropowatość próbek wynosiła 0,08-0,13 Ra.
Źródło:
Aktualne Problemy Biomechaniki; 2013, 7; 93-98
1898-763X
Pojawia się w:
Aktualne Problemy Biomechaniki
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
K-Ar Dating for Determining the Age of Mineralization as Alteration Product: A Case Study of Antimony Mineralization Vein Type in Granitic Rocks of Gümüşhane Area, Turkey
Autorzy:
Vural, A.
Powiązania:
https://bibliotekanauki.pl/articles/1031499.pdf
Data publikacji:
2017-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
83.80.Nb
91.67.Qr
Opis:
Is it feasible to use K-Ar dating method in determination of the age of mineralization by utilizing alteration minerals? The purpose of this study was to examine the utility of the K-Ar dating method to accurately determine the age of mineralization. In ideal circumstances, dating of alteration products, such as illite and serisite minerals, gives the age of alteration event, which is indirectly associated with mineralization. In the study site, referred to as Avliyana, antimony mineralization (Gümüşhane, Turkey), stibnite (antimony) mineralizations of hydrothermal vein type were observed in granitic young intrusive rocks and the host rocks. In the study area, alteration was observed in the form of a small amount of weak silicification, argillitization (sericitization and illitization), hematitization, limonitization close to the mineralization and of epidotization and chloritization far from the mineralization. In order to determine the limits of the age of antimony mineralizations of the area, the K-Ar method was used to date illite and serisite minerals, which are alteration products related to mineralization. Two samples containing sericite and illite were collected from Avliyana antimonite mineralization. The alteration origin of these minerals was confirmed by supporting petrographic, XRD and scanning electron microscope studies. These samples were analysed for K-Ar dating.
Źródło:
Acta Physica Polonica A; 2017, 132, 3; 792-795
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Gold and Silver Content of Plant Helichrysum Arenarium, Popularly Known as the Golden Flower, Growing in Gümüşhane, NE Turkey
Autorzy:
Vural, A.
Powiązania:
https://bibliotekanauki.pl/articles/1031645.pdf
Data publikacji:
2017-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
83.80.Nb
91.62.+g
Opis:
Geochemical and biogeochemical methods in mineral exploration have been widely used in recent years because of the depletion of known deposits and the need to explore buried deposits. The aim of this study was to investigate the gold and silver content of Helichrysum arenarium, popularly known as the golden flower, for possible exploration of precious ore deposits. For this purpose, plant samples of the respective plant parts (roots, stem-leaves and flowers) collected from Demirören village of Gümüşhane in the northeastern Turkey were analysed for gold and silver by using inductively coupled plasma mass spectrometry. Gold and silver contents of the plants was assessed on the basis of different statistical approaches. The results indicate that the plant has elevated levels of gold and silver concentrations, particularly in the case of gold. As a result, it was determined that the gold content of Helichrysum arenarium is remarkable and the gold accumulation capacity of the plant is high in the the stem-leaves, whereas the silver accumulation capacity of the plant is high in roots.
Źródło:
Acta Physica Polonica A; 2017, 132, 3; 978-980
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wykorzystanie technologii przyrostowej SLM w procesie przetwarzania stopu tytanu Ti-6Al-7Nb do zastosowań biomedycznych
Processing of titanium alloy Ti-6Al-7Nb for biomedical application using additive technology selective laser micrometalurgy
Autorzy:
Karoluk, M.
Pawlak, A.
Chlebus, E.
Powiązania:
https://bibliotekanauki.pl/articles/98902.pdf
Data publikacji:
2014
Wydawca:
Politechnika Śląska. Katedra Biomechatroniki
Tematy:
technologie przyrostowe
SLM
Ti6Al7Nb
additive technology
Ti-6Al-7Nb
Opis:
Znaczący rozwój w ostatnich latach technologii selektywnej laserowej mikrometalurgii proszków przyczynił się do rozpoczęcia badań nad możliwościami zastosowania tej technologii do wytwarzania nowej generacji implantów kości i ubytków kostnych. W niniejszej pracy został dokonany przegląd w tym kierunku. Ponadto dopasowanie właściwości mechanicznych struktur o otwartej wewnętrznej porowatości do właściwości mechanicznych kości staje się możliwe, poprzez odpowiednie sterowanie parametrami procesu.
A significant development of the selective laser micrometalurgy in recent years, contributed to the beginning of research into the possibilities of applying SLM technology for the production of a new generation of bone implants. The adjustment of the mechanical properties of the produced structures, with open porosity, to the mechanical properties of bone, becomes possible, by appropriate control of process parameters. Moreover, the results of biological tests, which look promising, confirm the right direction of research.
Źródło:
Aktualne Problemy Biomechaniki; 2014, 8; 81-86
1898-763X
Pojawia się w:
Aktualne Problemy Biomechaniki
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Assessment of sessile oak (Quercus petraea L.) leaf as bioindicator for exploration geochemistry
Autorzy:
Vural, A.
Powiązania:
https://bibliotekanauki.pl/articles/1068136.pdf
Data publikacji:
2016-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
83.80.Nb
91.62.+g
Opis:
The element contents of sessile oak (Quercus petraea L.) leaves which grow on hydrothermally altered area with high element contents were studied at Gümüşhane and its near vicinity. The aim of this study is to determine threshold element contents of Q. petraea L. leaves growing on the area. For this purpose, oak leave samples collected were analyzed by inductively coupled plasma-mass spectrometry for concentrations of some elements which were the group of most common trace elements in exploration geochemistry studies. The assessment of the element contents of the oak leaf is based on the descriptive statistics and computations of threshold values of leaves depending on statistical parameters and average element contents of the plants growing on lands in normal background values for the elements. According to Q-Q (normal quantile-quantile) plots, the Kolmogorov-Smirnov tests etc., all the elements, do not pass normality tests. Because of that, threshold values of the elements in leaves of oak were computed by median+median absolute deviation (MAD) and median+2MAD used in raw values for the elements. The data revealed that concentration levels of the examined elements in the leaves in the study area were determined as above and/or exceeded the upper limit of the normal range than in leaf of oak ( Q. petraea L.) which grows on lands with normal elements background. Therefore, it is concluded that leaves of Q. petraea L. can be used as bioindicator in exploration geochemistry, especially for base metal ore deposits.
Źródło:
Acta Physica Polonica A; 2016, 130, 1; 191-193
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Zachowanie elektrochemiczne stopu Ti-6Al-4V i Ti-6Al-7Nb po różnym okresie ekspozycji w SBF
Electrochemical behavior of Ti-6Al-4V and Ti-6Al-7Nb alloy after different time of exposure to SBF
Autorzy:
Pochrząst, M.
Walke, W.
Marciniak, J.
Kaczmarska, D.
Powiązania:
https://bibliotekanauki.pl/articles/285932.pdf
Data publikacji:
2009
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
Tematy:
Ti6Al4V
Ti6Al7Nb
SBF
Ti-6Al-7Nb
Źródło:
Engineering of Biomaterials; 2009, 12, no. 89-91; 152-154
1429-7248
Pojawia się w:
Engineering of Biomaterials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Charakteryzacja geometryczna i mechaniczna skaffoldów ze stopu TI6AL7NB wytworzonych w technologii laserowej mikrometalurgii
Geometrical and mechanical characterization of scaffolds manufactured from TI-6AL-7NB by laser micrometallurgy – SLM
Autorzy:
Szymczyk, P.
Pawlak, A.
Ziółkowski, G.
Dybała, B.
Chlebus, E.
Powiązania:
https://bibliotekanauki.pl/articles/99269.pdf
Data publikacji:
2013
Wydawca:
Politechnika Śląska. Katedra Biomechatroniki
Tematy:
skaffold
Ti6Al7Nb
mikrotomografia komputerowa
SLM
scaffold
Ti-6Al-7Nb
computed microtomography
Opis:
Praca przedstawia wyniki badań struktur mikroskaffoldów wytwarzanych ze stopu Ti6Al7Nb, w technologii laserowej mikrometalurgii proszków metali. Opracowana technologia wytwarzania mikrostruktur kratowych, umożliwia produkowanie regularnie porowatych struktur, składających się z porów w kształcie sześcianu z walcowymi belkami wpisanymi w jego krawędzie. Celem badań było opracowanie metodologii oceny i charakteryzacji wytworzonych struktur.
This paper presents the investigation results on Ti6Al7Nb micro scaffold structures, manufactured in metal powder Selective Laser Melting process. Developed technology of manufacturing lattice microstructures, can produce regular porous structure consisting of pores in the shape of a cube with cylindrical beams entered in the edges. The aim of the study was to develop a methodology for the evaluation and characterization of the produced structures.
Źródło:
Aktualne Problemy Biomechaniki; 2013, 7; 157-162
1898-763X
Pojawia się w:
Aktualne Problemy Biomechaniki
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Decomposition of the Kenticha mangano-tantalite ore by HF/H2SO4 and KOH fusion
Autorzy:
Berhe, G. G.
Velázquez del Rosario, A.
Tadesse, B.
Yimam, A.
Woldetinsae, G.
Powiązania:
https://bibliotekanauki.pl/articles/109478.pdf
Data publikacji:
2018
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
decomposition
Kenticha pegmatite
mangano-tantalite
Ta
Nb
Opis:
In this study, the decomposition behavior of Ta and Nb from the mangano-tantalite ore was investigated using HF/H2SO4 mixture and KOH fusion. The effects of reaction time, decomposition temperature, acid and alkaline concentrations, and particle size on the dissolution process were examined. Higher decomposition rates were achieved at 6:2 mol/dm3 ratio of HF and H2SO4, and with the addition of 10 g KOH in the alkali fusion step. In addition, similar trends in decomposition rates between two agents (HF/H2SO4 and KOH) and comparable dissolution performances were observed. The increase in the decomposition temperature initially increased the decomposition rate of mangano-tantalite for the two systems considered in this study. However, no significant change in the leaching rate of Ta and Nb was observed beyond 50 °C for the HF/H2SO4 system and above 400 °C when using the KOH fusion process. The elemental and compositional analyses of the leached residues using XRF, XRD, and FT-IR spectroscopy indicated that the acid (mixture of HF and H2SO4) decomposition resulted in slightly better dissolution performance for Ta compared with the alkaline fusion method. Overall, the results indicated that KOH can be a suitable alternative decomposition agent to the volatile, corrosive and toxic HF in the hydrometallurgical processing of tantalite ores.
Źródło:
Physicochemical Problems of Mineral Processing; 2018, 54, 2; 406-414
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analiza wpływu mikrostruktury na odporność korozyjną stopu tytanu Ti6Al7Nb
The analysis of the effect of microstructure on the corrosion resistance of titanium alloy Ti6Al7Nb
Autorzy:
Zięty, A.
Lachowicz, A.
Powiązania:
https://bibliotekanauki.pl/articles/99013.pdf
Data publikacji:
2014
Wydawca:
Politechnika Śląska. Katedra Biomechatroniki
Tematy:
Ti6Al7Nb
biomateriał
mikrostruktura
obróbka cieplna
Ti-6Al-7Nb
biomaterial
microstructure
thermal treatment
Opis:
Stopy tytanu, takie jak Ti6Al4V, czy analizowany Ti6Al7Nb należą do stopów o strukturze dwufazowej α+β. Kształtowanie ich mikrostruktury wynika ze specyficznych cech fizycznych tytanu, ale i z warunków odkształcania na gorąco oraz obróbki cieplnej. Procesy te powinny uwzględniać związek między mikrostrukturą a wytrzymałością implantu, jego twardością, plastycznością, odpornością na zmęczenie, zużycie ścierne i co najważniejsze – odpornością na korozję. Przeanalizowano istniejącą literaturę pod kątem wpływu mikrostruktury stopu tytanu Ti6Al7Nb na jego odporność korozyjną w symulowanych płynach ustrojowych. Jej różnorodność związana jest ze sposobem przetwarzania stopu, co również było obiektem analizy i obserwacji.
Titanium alloys, such as Ti6Al4V, or analyzed in this paper Ti6Al7Nb alloys are two-phase structure of α + β. Shaping their microstructure due to the specific physical characteristics of the titanium, its hot deformation and heat treatment. These processes should take into account the relation between the microstructure and strength of the implant, its hardness, ductility, resistance to fatigue, wear and what is the most important - corrosion resistance. Existing literature was analyzed for effects of titanium alloy microstructure Ti6Al7Nb its corrosion resistance in simulated body fluids. It is associated with a variety of melt processing method, which also has been the subject of analysis and observation.
Źródło:
Aktualne Problemy Biomechaniki; 2014, 8; 187-192
1898-763X
Pojawia się w:
Aktualne Problemy Biomechaniki
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 72

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