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Wyświetlanie 1-15 z 26
Tytuł:
Comparison of methods used in the recovery of Phylloplane bacteria: a case study of Pseudomonas savastanoi pv. savastanoi applied to the Phylloplane of Olea europaea sub-species
Autorzy:
Lamichhane, J.R.
Varvaro, L.
Powiązania:
https://bibliotekanauki.pl/articles/65558.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Opis:
An efficient and accurate method of sampling, recovery, and enumeration of epiphytic bacterial populations are of fundamental importance for their precise estimation. In this study, effectiveness and reliability of processing methods, sampling type, sample storage, and plating techniques, for the recovery of the epiphytic bacterial populations, were evaluated. Pseudomonas savastanoi pv. savastanoi, the causal agent of olive knot disease, and two olive sub-species were used. Bulk-leaf sampling allowed for a higher number of the bacterial recovery. The use of a lab blender was the most effective and reliable method among the four commonly used processing methods. A short storage of leaf samples was possible through freezing. Bacterial survival was not influenced as long as the samples were processed within 5 days and frozen without a buffer. No difference was observed among the drop and spread platings, suggesting that one of them can be used and the choice depends on the cost and time required.
Źródło:
Journal of Plant Protection Research; 2014, 54, 1
1427-4345
Pojawia się w:
Journal of Plant Protection Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Low temperature reverses the resistance to glyphosate in hairy fleabane (Conyza bonariensis)
Autorzy:
Dalazen, G.
Pisoni, A.
Menegaz, C.
Merotto Jr, A.
Powiązania:
https://bibliotekanauki.pl/articles/2084871.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
ammonium sulfate
EPSPS
non-target-site-resistance
vacuolar sequestration
translocation
Opis:
Environmental factors and the addition of adjuvants to the spray tank mix may interfere with glyphosate efficiency in hairy fleabane control. The objective of this study was to evaluate the effect of air temperature and the addition of ammonium sulfate (NH4)2SO4 to glyphosate in the control of glyphosate-resistant (GR) and -susceptible (GS) hairy fleabane. Treatments consisted of air temperatures of 12°C and 25°C, six doses of glyphosate from zero to 2,880 g · ha−1, the presence or absence of (NH4)2SO4 in the spray solution, and one GS and another GR biotype. At the lowest tested dose (180 g · ha−1), control of the GR biotype was 91% and 20% when the plants were kept at 12°C and 25°C, respectively, reducing the resistance factor (RF) by 9.30 times and was associated to the reduction of temperature. The addition of (NH4)2SO4 increased the control by 10−20% at high glyphosate doses and at 25°C. The resistance of hairy fleabane to glyphosate was completely reversed when the plants were maintained at 12°C. At this temperature, resistant plants were controlled even at doses well below that recommended for the control of this species. At 25°C, a dose four times higher than that recommended was required for satisfactory control. At the field level, under situations of low temperatures, it was possible to improve the efficacy of glyphosate applications in hairy fleabane control, if there were no other mechanisms of resistance involved.
Źródło:
Journal of Plant Protection Research; 2019, 59, 4; 433-440
1427-4345
Pojawia się w:
Journal of Plant Protection Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Study of factors determinant of siliceous electrical porcelain resistance to structural degradation
Autorzy:
Ranachowski, P.
Ranachowski, Z.
Kudela Jr., S.
Pawełek, A.
Piątkowski, A.
Powiązania:
https://bibliotekanauki.pl/articles/351813.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
porcelain insulating materials
ageing processes
acoustic emission (AE)
optical microscopy
Opis:
The subject of this study was investigation of the factors that have a decisive influence on the resistance of siliceous porcelain to degradation processes. There was tested material C 110 type, which is widely used for the production of low-voltage (LV) elements such as insulators and bushings. On the basis of mechanical-acoustic and microscopic research of small-sized samples, which were subjected to compression, there were distinguished successive stages of degradation of the material structure. In the authors* opinion, they have a reference to the ageing process, taking place during many years of work under operating conditions. Thus, it was possible to assess the structural factors that determine the durability and reliability of LV electroinsulating elements. The results were related to electrical aluminous porcelains.
Źródło:
Archives of Metallurgy and Materials; 2016, 61, 3; 1489-1496
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Flat polymer loop thermosyphons
Autorzy:
Vasiliev, L.
Grakovich, L.
Rabetsky, M.
Zhuravlyov, A.
Vassiliev Jr., L.
Powiązania:
https://bibliotekanauki.pl/articles/240396.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
thermosyphon
heat pipe
heat transfer
cooling technologies
air conditioning
refrigeration
LED cooling systems
termosyfon
rura cieplna
wymiana ciepła
technologie chłodnicze
klimatyzacja
chłodnictwo
Opis:
The flat horizontal polymer loop thermosyphon with flexible transport lines is suggested and tested. The thermosyphon envelope consists of a polyamide composite with carbon based high thermal conductive micro-, nanofilaments and nanoparticles to increase its effective thermal conductivity up to 11 W/(m°C). Rectangular capillary mini grooves inside the evaporator and condenser of thermosyphon are used as a mean of heat transfer enhancement. The tested working fluid is R600. Thermosyphon evaporator and condenser are similar in design, have a long service life. In this paper three different methods (transient, quasi-stationary, and stationary) have been used to determine the thermophysical properties of polymer composites used as an envelope of thermosyphon, which make it possible to design a wide range of new heat transfer equipment. The results obtained contribute to establish the viability of using polymer thermosyphons for ground heat sinks (solar energy storage), gas-liquid heat exchanger applications involving seawater and other corrosive fluids, efficient cooling of superconductive magnets impregnated with epoxy/carbon composites to prevent wire movement, enhance stability, and diminish heat generation.
Źródło:
Archives of Thermodynamics; 2018, 39, 1; 75-90
1231-0956
2083-6023
Pojawia się w:
Archives of Thermodynamics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Quasi-Static and Dynamic Testing of Carbon Fiber Reinforced Magnesium Composites
Autorzy:
Ranachowski, Z.
Ranachowski, P.
Brodecki, A.
Kopeć, M.
Kudela, S. jr.
Powiązania:
https://bibliotekanauki.pl/articles/351742.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Mg matrix composite
compressive properties
carbon fiber
Split-Hopkinson Pressure Bar
Opis:
Two types of composites, consisting of pure magnesium matrix reinforced with two commercially used carbon fibers, were systematically studied in this paper. The composites fabricated by the pressure infiltration method, were subjected to quasistatic and dynamic compression tests. Morphology of fiber strands was observed using scanning electron microscope (SEM). The application of carbon fibre reinforcement led to the stiffening of tested materials, resulting in the limitation of the possible compression to approx. 2.5%. The performed tests revealed the remarkable difference in compression strength of investigated compositions. The cause of that effect was that GRANOC fiber reinforced composite exhibited insufficient bond quality between the brittle fibers and the ductile matrix. T300 reinforced composite presented good connection between reinforcement and matrix resulting in increased mechanical properties. Investigated composites demonstrated higher mechanical strength during deformation at high strain rates. Microscopic observations also proved that the latter fibers with regular shape and dense packaging within the filaments are proper reinforcement when designing the lightweight composite material.
Źródło:
Archives of Metallurgy and Materials; 2020, 65, 2; 893-899
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Study of Modified Aluminous Porcelain Subjected to Mechanoacoustic Tests
Autorzy:
Ranachowski, P.
Ranachowski, Z.
Wieczorek, K.
Jaroszewski, M.
Kudela, S. jr.
Powiązania:
https://bibliotekanauki.pl/articles/355059.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
electrical porcelain materials
ageing processes
acoustic emission
AE
optical microscopy
Opis:
The paper presents the microscopic and mechanoacoustic study of degradation processes of the porcelain material C 130 type. This kind of material is used in the production of the most durable and reliable electrotechnical elements. Raw material composition of the studied porcelain was modified. This had an impact on the inner properties, cohesion and – in consequence – on operational properties of the material. Using mechanical-acoustic and microscopic methods of testing of small-size samples that were subjected to compression, it was possible to distinguish successive stages of degradation of the porcelain structure. These stages were generally typical of the porcelain materials. In the authors’ opinion, they are connected to the ageing process happening over many years of work under operating conditions. Optimization of composition and technological properties – important during technological processes – resulted in a slight decrease in inner cohesion of the porcelain. When compared to the reference material – typical domestic C 130 material, mechanical strength was somewhat lower. Carried out investigations proved that resistance of the investigated material to the ageing degradation process – during long term operation – also decreased. The improvement of technological parameters and the reduction in the number of defective elements occurred simultaneously with some decrease in the operational parameters of the material. To restore their initial high level, further work is needed to optimize the raw material composition of the porcelain.
Źródło:
Archives of Metallurgy and Materials; 2018, 63, 4; 1821-1826
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Antifungal activity of Trichoderma VOCs against Pyrenophora teres, the causal agent of barley net blotch
Autorzy:
Moya, P.
Girotti, J.R.
Toledo, A.V.
Sisterna, M.N.
Powiązania:
https://bibliotekanauki.pl/articles/65288.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
biological control
biopesticide
fungi
gas chromatography
mass spectrometry
pathogen
Pyrenophora teres
Trichoderma
antifungal activity
volatile organic compound
Opis:
Many species of Trichoderma produce secondary metabolites such as volatile organic compounds (VOCs) that reduce plant diseases and promote their growth. In this work we evaluated the antagonistic effects of VOCs released by eight strains of two Trichoderma species against Pyrenophora teres Drechsler, the causal agent of barley net blotch. Antagonism was estimated based on the percentage of mycelial growth inhibition according to the confronted cultures method. VOCs extraction and identification were performed by gas chromatography and mass spectrometry, through different methodologies for VOCs emitted by antagonists and pathogens alone or when confronted. VOCs produced by all Trichoderma strains inhibited mycelial growth of the pathogen in a range of 3 to 32%, showing weak and unpigmented mycelia with vacuolization. In addition, P. teres stimulated the release of VOCs by both Trichoderma species. The major groups of VOCs detected were sesquiterpenes, followed by diterpenes, terpenoids and eight-carbon compounds. This is the first report about characterization of volatiles emitted by Trichoderma in the presence of P. teres.
Źródło:
Journal of Plant Protection Research; 2018, 58, 1
1427-4345
Pojawia się w:
Journal of Plant Protection Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Early Stages of Growth in Technology- and Service-Based Firms
Autorzy:
Muhos, Matti
Saarela, Martti
Simunaniemi, Anna-Mari
Foit Jr., Del
Rasochova, Lada
Powiązania:
https://bibliotekanauki.pl/articles/1841415.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
stages of growth
SMEs
micro-sized enterprises
technology-based firm
service-based firm
Opis:
Many stages of growth models have been introduced to clarify management priorities during the early stages of business growth. However, many of these models are conceptual and universal, providing only limited benefits to specific industries and business contexts. The early stages of technology-based ventures have attracted broad interest, while less attention has been paid to the early stages of service-based firms. However, in recent years, interest in service-based businesses, as well as servitisation, has grown. This literature-based study explores and compares the early stages of growth in service-based and technology-based firms. On one hand, this study condenses the basic characteristics of recent empirical studies on the early stages of technology- and service-based firms. On the other, this study clarifies the central themes, sequential patterns and central differences in the early stages of service- and technology-based firms. This study pinpoints the importance of contextual understanding related to the early stages of business growth and encourages the scholars towards bridging the contextual gaps of this stream of literature.
Źródło:
Management and Production Engineering Review; 2021, 12, 2; 3-16
2080-8208
2082-1344
Pojawia się w:
Management and Production Engineering Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Research on the influence of excavation and loading on Z-Direction displacement in surrounding soil mass
Badania wpływu prac wydobywczych i składowania na wielkość przemieszczenia gruntu w kierunku z w otaczającym górotworze
Autorzy:
Li, X.
Zhou, W.
Han, L.
Xi, W. J.
Crusoe Jr., G. E.
Powiązania:
https://bibliotekanauki.pl/articles/220213.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
wydobycie
składowanie
wytrzymałość gruntu w trakcie składowania
naprężenia
przemieszczenia
kołowy przebieg przemieszczenia
excavation
loading
unloading strength
stress
region displacement
displacement circle
Opis:
To probe into the pattern in which the excavation and loading process have on such factors as stress and displacement in neighboring regions of deep open pits, a mechanical unloading model in coal mining process and another model for the loading process are set up respectively. Besides, FLAC3D software is used to simulate dynamic excavating and loading process in open pits and record such data as the unbalanced stress, unloading strength and displacement fluctuations, which further serve as basis for studying the functional relationship about different mining heights and scope of influence using fitting method. The research results indicate that the unloading strength enhances with increasing mining depth in a linear fashion. In addition, a noticeable displacement circle takes shape around the stope, which would also extends with growing mining depth. As to waste loading, it brings about large-scale surface subsidence in neighboring regions, which follows a logarithm function convergence pattern with the distance away from the dump border. Under combined effects of excavation and loading, the value of the soil mass displacement would increase with growing mining depth and loading height. Specifically, the soil displacement at a distance of 100 m away from the stope border (around 200 m away from the outer dump border) is abnormally significant and it further develops at a rate of 0.0228 mm/h.
W celu zbadania zależności pomiędzy procesami wydobycia i składowania urobku a takimi czynnikami jak naprężenia i przemieszczenia w sąsiadujących partiach głębokich wyrobisk odkrywkowych, wykorzystano model mechaniczny procesu urabiania węgla oraz model procesu jego składowania. Wykorzystano oprogramowanie FLAC 3D do symulacji procesów wydobycia i składowania w wyrobiskach odkrywkowych, zapisano odpowiednie dane: niezrównoważone naprężenia, wytrzymałość w trakcie odciążania oraz wahania przemieszczeń gruntu, które wykorzystane zostały następnie jako podstawa do badania funkcjonalnych zależności pomiędzy wysokością poziomu wydobycia a skalą oddziaływania, przy użyciu odpowiednich metod dopasowania. Wyniki badań wskazują, że wytrzymałość w trakcie odciążania wzrasta liniowo z głębokością. Ponadto, zarejestrowano wyraźny kołowy przebieg przemieszczenia wokół zbocza, który także rośnie z głębokością. W przypadku obciążenia wskutek urobku odpadowego, zanotowano obniżenia terenu o dużym zasięgu o przebiegu konwergencji opisanym funkcją logarytmiczną odległości od miejsca składowania urobku odpadowego. W przypadku wystąpienia połączonych efektów wydobycia i składowania, wielkość przemieszczeń mas gruntu wzrastać będzie wraz z głębokością prowadzenia prac i wysokością składowania. Przemieszczenie gruntu w odległości 100 m od brzegu wyrobiska (ok. 200 od zewnętrznej granicy składowiska) okazuje się niepokojąco duże i postępujące w tempie 0.0228 mm/h).
Źródło:
Archives of Mining Sciences; 2014, 59, 4; 959-970
0860-7001
Pojawia się w:
Archives of Mining Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mechanical Spectroscopy of MgB2 Containing SiC
Spektroskopia mechaniczna MgB2 zawierającego SiC
Autorzy:
Silva, M. R.
Silva, L. B. S.
Rodriques Jr., D.
Grandini, C. R.
Powiązania:
https://bibliotekanauki.pl/articles/355880.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
mechanical spectroscopy
internal friction
anelasticity
MgB2
SiC
spektroskopia mechaniczna
tarcie wewnętrzne
właściwości anelastyczne
Opis:
The compound magnesium diboride (MgB2) has been well-known since the 1950s; however, its superconducting properties were unknown. Intrinsic characteristics of MgB2 make this material a promising candidate for technological applications, although the low value of the irreversibility field and the decrease in critical current density with the increase in the magnetic field considerably reduce its utility. The present work aimed to study the effect of carbon-based doping on anelastic properties of MgB2 as measured by mechanical spectroscopy. The samples were prepared by using the powder-intube method. The samples were made with 5, 7.5, and 10 wt.% of silicon carbide (SiC). The results reveal complex mechanical loss spectra caused by the interaction between point defects and surface defects in the crystalline lattice of MgB2.
Dwuborek związek magnezu (MgBV) jest znany od 1950 roku; jednak jego właściwości nadprzewodzące były nieznane. Swoiste cechy MgB2 czynią ten materiał obiecującym kandydatem do zastosowań technicznych, jednak niskie wartości nieodwracalnego pola i zmniejszenie krytycznej gęstości prądu ze wzrostem pola magnetycznego znacznie zmniejszają jego użyteczność. Celem pracy było zbadanie wpływu domieszkowania związkiem węgla na anelastyczne właściwości MgB2 mierzone metodą spektroskopii mechanicznej. Próbki zostały przygotowane za pomocą metody powder-in-tube (PIT). Wytworzono próbki o zawartości 5, 7.5 i 10 % wag. węglika krzemu (SiC). Wyniki pokazują złożone widma strat mechanicznych powodowanych przez wzajemne oddziaływanie pomiędzy defektami punktowymi i defektami powierzchniowymi w sieci krystalicznej MgB2.
Źródło:
Archives of Metallurgy and Materials; 2015, 60, 4; 3083-3086
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Evaluation of the mullite hypothesis in respect of electrotechnical porcelains
Ocena mulitowej teorii wzmocnienia w zastosowaniu do porcelan elektrotechnicznych
Autorzy:
Ranachowski, P.
Rejmund, F.
Ranachowski, Z.
Pawełek, A.
Piątkowski, A.
Kudela Jr., S.
Powiązania:
https://bibliotekanauki.pl/articles/352850.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
electrotechnical porcelain
porcelain degradation
acoustic emission (AE)
microscopic analysis
porcelana elektrotechniczna
degradacja porcelany
emisja akustyczna (EA)
analiza mikroskopowa
Opis:
The paper presents the evaluation of the mullite hypothesis explaining the strength of porcelains. There was researched the influence of the mullite phase on the short- and long-term mechanical strength of electrotechnical porcelain of different types (C 110, C 112, C 120 and C 130). The total mullite phase content, the size and distribution of precipitates and dispersed single crystals in the glassy matrix were considered. Mechanoacoustic and microscopic techniques as well as ultrasonic testing were used during the investigation. The role of the mullite phase in the increase of strength and resistance to aging processes of electrical porcelain of various types was described. Mullite hypothesis is valid in reference to siliceous (C 110), cristobalite (C 112) and aluminous C 120 type materials of a typical raw components content and phase composition. In the case of modern strengthened C 120 and C 130 type aluminous materials advantageous are only dispersed fine mullite needles. The precipitates of mullite phase, especially of bigger size, are undesirable.
W pracy przedstawiono ocenę teorii mulitowej wzmocnienia porcelany, w odniesieniu do tworzyw elektrotechnicznych. Przedmiotem badań był wpływ fazy mulitowej na krótko- i długotrwałą wytrzymałość mechaniczną elektroporoelan rodzaju C 110, C 112, C 120 oraz C 130. Rozpatrywana była sumaryczna zawartość fazy mulitowej. wielkość i rozłożenie jej wydzieleń oraz niezaglomeryzowanych kryształów w osnowie szklistej. W badaniach wykorzystano metodę mechanoakustyczną, techniki mikroskopowe (MO i SEM) oraz metodę ultradźwiękową. Przedstawiono rolę fazy mulitowej w podwyższeniu odporności na procesy starzeniowe porcelany elektrotechnicznej różnego rodzaju. Stwierdzono słuszność teorii mulitowej w przypadku tworzyw kwarcowych (C 110), krystobalitowych (C 112) oraz wysokoglinowych rodzaju C 120 o typowym - tradycyjnym składzie surowcowym i fazowym. W zastosowaniu do nowoczesnych, wzmocnionych tworzyw wysokoglinowych rodzaju C 120 oraz porcelan rodzaju C 130 korzystnie działają rozproszone w osnowie, niezaglomeryzowane igłowe kryształy mulitu. Wydzielenia mulitu, zwłaszcza o większych rozmiarach, są niepożądane.
Źródło:
Archives of Metallurgy and Materials; 2013, 58, 4; 1177-1181
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Degradation Processes in Shield-Centring Elements of Surge Arresters
Autorzy:
Papliński, P.
Śmietanka, H.
Ranachowski, P.
Ranachowski, Zbigniew
Wieczorek, K.
Kudela, S. jr.
Powiązania:
https://bibliotekanauki.pl/articles/2203744.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
surge arrester
TSE glass textolite
discharge current
EDS method
Opis:
This paper presents the results of testing samples of shield-centering elements from medium-voltage surge arresters. The elements were made of TSE glass textolite. The elements have been dismantled from different operated surge arresters, which were subjected to discharge currents (short-circuit currents) of different intensity and duration. The discharge currents led to degradation of the tested elements with various degrees of advancement. The degradation was investigated using microscopic methods and energy-dispersive X-ray spectroscopy (EDS). Changes in the content of elements of the surface of textolite materials - as the degradation progresses - were documented. It was found that high discharge current flows resulted in melting of the organic binder, epoxy resin, especially its surface layer. Partial charring and even burning of the resin was noticeable. Furthermore, it was found that with increasing degradation on the surface of the TSE laminate, the carbon and oxygen content, which are part of the organic resin, decreases. Simultaneously the amount of silicon, calcium and aluminium, which are present in the glass fibres, increases. The charring effect of the resin and the formation of conductive paths result in a decrease in the performance of surge arresters and their subsequent failure.
Źródło:
Archives of Metallurgy and Materials; 2023, 68, 1; 237--242
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Internal Friction and Microstructure of Ti and Ti-Mo Alloys Containing Oxygen
Autorzy:
Martins Jr, J. R. S.
Araújo, R. O.
Nogueira, R. A.
Grandini, C. R.
Powiązania:
https://bibliotekanauki.pl/articles/351840.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
mechanical spectroscopy
anelasticity
internal friction
Ti-Mo alloys
interstitials
biomaterials
Opis:
Ti-Mo alloys are promising materials for use as biomaterials, because these alloys have excellent corrosion resistance and a good combination of mechanical properties such as fatigue, low elastic modulus, hardness, and wear resistance. The objective of this paper was to study the effect of heavy interstitial atoms on anelastic properties of Ti-Mo alloys using mechanical spectroscopy. The internal friction and Young’s modulus were measured as a function of temperature using dynamic mechanical analyser. The internal friction spectra were brought about by relaxation processes attributed to shortrange stress induced reorientation of interstitial and substitutional complexes in solid solution. It is suggested that the nature of the relaxing entities can be worked out in further research on Ti-Mo single crystals.
Źródło:
Archives of Metallurgy and Materials; 2016, 61, 1; 25-30
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Statistical Assessment of the Microstructure of Barite Aggregate from Different Deposits Using X-Ray Microtomography and Optical Microscopy
Autorzy:
Żołek, N.
Ranachowski, Z.
Ranachowski, P.
Jóźwiak-Niedźwiedzka, D.
Kudela, S. jr.
Dvorak, T.
Powiązania:
https://bibliotekanauki.pl/articles/351890.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
barite ore
barite aggregate
microstructure
optical microscopy
thin sections analysis
X-ray tomography
Opis:
Two different barite ore (barium sulfate BaSO4) specimens from different localizations were tested and described in this paper. Analysis of the microstructure was performed on polished sections, and on thin sections using X-ray microtomography (micro-CT), and optical microscopy (MO). Microtomography allowed obtaining three-dimensional images of the barite aggregate specimens. In the tomograms, the spatial distribution of the other polluting phases, empty space as well as cracks, pores, and voids – that exceeded ten micrometers of diameter-were possible to visualize. Also, the micro-CT allowed distinguishing between minerals of different density, like SiO2 and BaSO4. Images obtained and analyzed on thin sections with various methods using the optical microscopy in transmitted light delivered additional information on the aggregate microstructure, i.e. allow for estimation of the different kinds of inclusions (like the different density of the minerals) in the investigated specimens. Above methods, which were used in the tests, completed each another in order to supply a set of information on inclusions’ distribution and to present the important differences of the barite aggregate specimens microstructure.
Źródło:
Archives of Metallurgy and Materials; 2017, 62, 2A; 697-702
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
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