Skocz do pozycji: 1.

Tytuł:

Identification of sandstone-related rocks composition using the X-ray analysis

Autorzy:

Kosuth, M.

Powiązania:

https://bibliotekanauki.pl/articles/344037.pdf

Data publikacji:

2013

Wydawca:

nakł. Maciej Pawlikowski

Tematy:

X-ray analysis
mineral composition
sandstones
siltstones
calcite
dolomite

Opis:

The article presents knowledge based on investigation of sandstones or siltstones composition from the Paleogene flysch terrains in North-East Slovakia. Samples of frequently crumbling clastic rocks were commonly considered to be close to sandstones, composed by predominant quartz. The set of such samples, belonging to Dukla Unit Sandstones were analyzed using the XRD analyses. Beside of quartz the diffraction patterns gave the evidence in significant carbonate share with some minor to minute feldspars, mica and chlorite contents. Among majority of analyzed samples we distinguish three groups of sandstones: (1) with the abundant calcite admixture, (2) the sandstones which contain meaning dolomite portion. The group (3) is representing the samples is formed the same by quartz as by both of carbonates, each of them could form important up to prevailed mineral component. Comparison of analyzed samples mineral composition shows remarkable trend of higher calcite and dolomite contents in younger clastic sediments.

Źródło:

Auxiliary Sciences in Archaeology, Preservation of Relics and Environmental Engineering; 2013, 16; 1-7
1689-6742

Pojawia się w:

Auxiliary Sciences in Archaeology, Preservation of Relics and Environmental Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 2.

Tytuł:

Structure, physical properties and fractal character of surface topography of CVD coatings

Autorzy:

Kwaśny, W.

Powiązania:

https://bibliotekanauki.pl/articles/100107.pdf

Data publikacji:

2011

Wydawca:

Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych

Tematy:

CVD coatings
fractal geometry
multifractal geometry
X-ray analysis

Opis:

The aim of the presented study is to establish a methodology elaboration, giving a possibility to predict properties of coatings reached in CVD process on tool materials, based on fractal quantities describing their surface. Coatings' topography and its structure which has an impact on a shape of analysed objects' surface were characterised in a comprehensive way. Influence of a type of process and conditions of deposition over structure and shape of topography as well as mechanical and operational properties of the acquired coatings were determined.

Źródło:

Journal of Machine Engineering; 2011, 11, No. 1-2; 134-151
1895-7595
2391-8071

Pojawia się w:

Journal of Machine Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 3.

Tytuł:

Influence of Ceramic Coating on Mechanical Properties of Stainless Steel

Autorzy:

Czekaj, D.
Lisińska-Czekaj, A.
Krzysztofowicz, K.

Powiązania:

https://bibliotekanauki.pl/articles/353220.pdf

Data publikacji:

2020

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

stainless steel
X-ray analysis
microhardness
sol-gel ceramic coating

Opis:

Crystal structure and phase composition of stainless steel substrates (AISI 304 type) was studied and it was found that they adopted the cubic symmetry. The calculated elementary cell parameter for the mayor Fe-Ni phase (weight fraction 99%) was a = 3.593 Å, whereas the mean grain size was = 2932 Å. Morphology of the stainless steel substrate surface was studied with profilometry. Mechanical properties of the stainless steel substrates and stainless steel substrates coated with ceramic layer of barium strontium titanate were studied with microhardness tester. For measurements performed according to the Vickers method the average microhardness was found HV = 189 or HV = 186 for the “in-line” and “mapping” measurement pattern, respectively. The sol-gel method was used to coat the surface of the stainless steel substrate with a thin ceramic layer of the chemical composition Ba_0.6 Sr_0.4 TiO₃ . It was found that the stainless steel substrate covered with sol-gel deposited ceramic coating exhibited the average hardness within the range HV = 217 up to HV = 235 for loading force F = 98 mN and F = 0.98 N, respectively. The Knopp method was also used and it was found that the stainless steel substrate with Ba_0.6 Sr_0.4 TiO₃ coating exhibited hardness HK = 386.

Źródło:

Archives of Metallurgy and Materials; 2020, 65, 2; 911-916
1733-3490

Pojawia się w:

Archives of Metallurgy and Materials

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 4.

Tytuł:

N-N Bond Lengths and Initiation Reactivity of Nitramines

Autorzy:

Zeman, Svatopluk
Atalar, Taner
Růžička, Aleš

Powiązania:

https://bibliotekanauki.pl/articles/358441.pdf

Data publikacji:

2020

Wydawca:

Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego

Tematy:

bond length
impact sensitivity
nitramines
reactivity
thermal decomposition
X-ray analysis

Opis:

For the 16 selected nitramines, it is shown that an increase in the energy content of these molecules (represented by enthalpies of formation) is connected with an increase in the lengths of the longest N–N bonds in the molecules. These lengths are directly proportional to the activation energies of the low-temperature thermal decomposition of the pure nitramines in all states of matter for this reaction. Raising the energy content also leads to reductions in the rate constants of thermal decomposition. Both of these facts are in contrast to expectations and also with similar published findings concerning thermal decomposition of nitramines in solution, which can be explained by the solvation effect and termination of the emerging aza-radicals in solutions. The calculated dissociation energies of the weakest N–N bonds yielded a relatively good reciprocal conformity with the lengths of the longest N–N bonds of the nitramines studied, especially when using the UB3LYP/6-31G* method. The relationship between the impact sensitivity of these nitramines and the lengths of their longest N–N bond is not completely clear. Such lengths cannot be a measure of impact reactivity, because the longest N–N bond might be stabilized in some cases by suitable intermolecular interactions with adjacent molecules in the crystal lattice.

Źródło:

Central European Journal of Energetic Materials; 2020, 17, 2; 169-200
1733-7178

Pojawia się w:

Central European Journal of Energetic Materials

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 5.

Tytuł:

Application of X-ray fluorescence techniques for the determination of hazardous and essential trace elements in environmental and biological materials

Autorzy:

Bamford, S.
Wegrzynek, D.
Chinea-Cano, E.
Markowicz, A.

Powiązania:

https://bibliotekanauki.pl/articles/147255.pdf

Data publikacji:

2004

Wydawca:

Instytut Chemii i Techniki Jądrowej

Tematy:

biological material
environmental materials
X-ray fluorescence analysis

Opis:

The utilization of X-ray fluorescence technique for the determination of trace element concentrations in environmental and biological samples is presented. The analytical methods used include energy dispersive X-ray fluorescence with polarizing secondary targets, total reflection X-ray fluorescence, direct in-situ X-ray fluorescence, and micro-beam X-ray fluorescence spectrometry. These methods were applied to analysis of different samples including soil, water, plant material and airborne particulate matter collected on polycarbonate filters. The performance and achieved detection limits of elements for different techniques, established by measuring appropriate reference standards, are presented. Also described is the utilization of micro-beam X-ray fluorescence technique for studying element distribution in heterogeneous samples and investigating the 2D- and 3D-morphology of minute samples by means of computerized X-ray absorption and X-ray fluorescence tomography. The different X-ray techniques have their unique advantages. The micro-beam X-ray fluorescence set-up has an advantage of producing very well collimated primary X-ray beam (about 15 mm in diameter), in front of which the analyzed sample can be precisely positioned, providing local information about the sample composition. The energy dispersive X-ray fluorescence with secondary targets offers rapid analysis of broad range of elements (Na–U) combined with a simple sample preparation method. Total reflection X-ray fluorescence technique, characterized by the lowest detection limits of elements, has its leading edge in analysis of liquid samples, and dealing with particle size effects in air particulates collected on filter papers. In-situ X-ray fluorescence spectrometers are truly portable and enable on the spot, in field analysis. It is shown that the combination of several XRF methods

Źródło:

Nukleonika; 2004, 49, 3; 87-95
0029-5922
1508-5791

Pojawia się w:

Nukleonika

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 6.

Tytuł:

Wpływ procesu redukcji na właściwości strukturalne i mechaniczne szkieł tlenkowych z grupy (Pb,Bi)-(Si,Ge)-O
Influence of reduction process on the structural and mechanical properties of (Pb,Bi)-(Si,Ge)-O oxide glasses

Autorzy:

Bochentyn, B.

Powiązania:

https://bibliotekanauki.pl/articles/134776.pdf

Data publikacji:

2015

Wydawca:

ADVSEO

Tematy:

szkła tlenkowe
skaningowa mikroskopia elektronowa
analiza rentgenowska
oxide glass
reduction
Scanning Electron Microscopy
Energy Dispersive X-Ray Analysis

Opis:

The effect of the reduction process in H2 at 380 °C on the microstructure and elemental composition of a glass Bi0.4Pb0.2Si0.4Ox has been investigated. It has been shown that after reduction a clearly separated top layer with a thickness of approx. 50 µm was formed on the surface of the sample. This layer is depleted of oxygen and has higher electrical conductivity than the interior of the glass. It has also been found that some granules of metallic bismuth with a diameter of tens to hundreds of nanometers were formed on the surface of the glass. Furthermore, depletion of lead was observed in these samples in relation to the initial stoichiometry of the glass prior to trial reduction.

Źródło:

Technical Issues; 2015, 2; 3-8
2392-3954

Pojawia się w:

Technical Issues

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 7.

Tytuł:

Metallurgical analysis of the causes of failure of the hardening furnace conveyor belt

Autorzy:

Merda, A.
Klimaszewska, K.
Sroka, M.
Golański, G.

Powiązania:

https://bibliotekanauki.pl/articles/378641.pdf

Data publikacji:

2019

Wydawca:

Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach

Tematy:

microstructure
X-ray phase analysis
precipitates
failure
mikrostruktura
rentgenowska analiza fazowa
osady
niepowodzenie

Opis:

Purpose: The aim of the tests was to analyze the microstructure and mechanical properties of a section of the hardening furnace conveyor belt serviced at the temperature of 880-920°C in the carburizing atmosphere, in the context of determining the probable causes of its failure. Design/methodology/approach: The scope of performed tests included: chemical composition analysis of the steel and particles, microstructure investigated using optical and scanning electron microscopy, X-ray phase analysis. Findings: The analysis of the chemical composition showed that the examined material was austenitic steel X15CrNiSi25-21 (S310). Performed metallurgical tests showed that after the service the examined steel was characterized by austenitic structure with numerous precipitates of diverse morphology. In the structure the sigma phase particles and probably the M23C6 carbides precipitates were observed. The continuous grid of precipitates on the boundaries of grains (mainly the sigma phase) and the influence of the cyclic changing heat loads (or thermo-mechanical loads) were the main causes of failure of the analysed detail. Research limitations/implications: The aim of the work was to determine the probable causes of damage of the material used for a conveyor belt of a hardening furnace. Practical implications: The results of investigation and analysis of the metallographic of het-resisting austenitic steel X15CrNiSi25-21 (S310) after service at the temperature of 880-920°C are presented. Originality/value: The paper presents the results of research on the microstructure and mechanical properties of the section of hardening furnace conveyor belt made of creepresisting austenitic steel. The aim of the performed tests was to determine the probable causes of damage of the analysed detail.

Źródło:

Archives of Materials Science and Engineering; 2019, 98, 2; 68-73
1897-2764

Pojawia się w:

Archives of Materials Science and Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 8.

Tytuł:

Zmiany struktury zaczynu cementowego pod wpływem roztworu powodującego dekalcyfikację
Changes of the cement paste structure under decalcification

Autorzy:

Słomka-Słupik, B.
Zybura, A.

Powiązania:

https://bibliotekanauki.pl/articles/362852.pdf

Data publikacji:

2009

Wydawca:

Instytut Fizyki Budowli Katarzyna i Piotr Klemm

Tematy:

dekalcyfikacja zaczynu cementowego
chlorek amonu
analiza rentgenowska
SEM-BSE
analiza obrazu
decalcification of the cement paste
ammonium chloride
X-ray analysis
image analysis

Opis:

Przedstawiono zmiany struktury zaczynu z cementu portlandzkiego zwykłego zachodzące wskutek działania chlorku amonu, który wchodzi w skład ścieków zakładów koksochemicznych. Działanie agresywne nasyconego roztworu NH4Cl trwało 25 dób. Badania rentgenowskie składu fazowego wskazały zanikanie portlandytu przy brzegu próbki. Wywołane ubytkiem portlandytu nieciągłości struktury określono na podstawie obserwacji zgładu w elektronowym mikroskopie skaningowym (SEM) oraz stosując metodę analizy obrazu.
The changes of ordinary Portland cement paste structure caused by interaction with ammonium chloride solution, which is present in coke sewage, are described. The aggressive immersion of specimen lasted for 25 days into saturated solution of NH4Cl. The X-ray examinations of phase composition pointed at portlandite decrease and its disappearance at the edge of the specimen. Discontinuities of the cement paste matrix caused by the portlandite amount changes determined from the polished section observations into scanning electron microscope using backscattered electrons with application of image analysis.

Źródło:

Fizyka Budowli w Teorii i Praktyce; 2009, T. 4; 163-168
1734-4891

Pojawia się w:

Fizyka Budowli w Teorii i Praktyce

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 9.

Tytuł:

Mechanical behaviour and phase transition mechanisms of a shape memory alloy by means of a novel analytical model

Autorzy:

Carpinteri, A.
Di Cocco, V.
Fortese, G.
Ronchei, C.
Scorza, D.
Vantadori, S.
Zanichelli, A.
Iacoviello, F.
Natali, S.

Powiązania:

https://bibliotekanauki.pl/articles/386617.pdf

Data publikacji:

2018

Wydawca:

Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej

Tematy:

fatigue behaviour
phase transition mechanisms
shape memory alloy
tensile cyclic test
x-ray diffraction analysis

Opis:

The aim of the present paper is to examine both the fatigue behaviour and the phase transition mechanisms of an equiatomic pseudo-elastic NiTi Shape Memory Alloy through cyclic tests (up to 100 loading cycles). More precisely, miniaturised dog-bone specimens are tested by using a customised testing machine and the contents of both austenite and martensite phase are experimentally measured by means of X-Ray diffraction (XRD) analyses. On the basis of such experimental results in terms of martensite content, an analytical model is here formulated to correlate the stress-strain relationship to the phase transition mechanisms. Finally, a validation of the present model by means of experimental data pertaining the stress-strain relationship is performed.

Źródło:

Acta Mechanica et Automatica; 2018, 12, 2; 105-108
1898-4088
2300-5319

Pojawia się w:

Acta Mechanica et Automatica

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 10.

Tytuł:

Analiza nieorganicznych i organicznych pozostałości po wystrzale z broni palnej.
Analysis of inorganic and organic remains after firearms discharge.

Autorzy:

Łasińska, Anna

Powiązania:

https://bibliotekanauki.pl/articles/501767.pdf

Data publikacji:

2017-03-15

Wydawca:

Agencja Bezpieczeństwa Wewnętrznego

Tematy:

skaningowa mikroskopia elektronowa,
SEM,
mikroanaliza rentgenowska,
EDS,
pozostałości po wystrzale z broni palnej,
GSR,
spektroskopia Ramana.
scanning electron microscopy,
X-ray analysis,
EDX,
gunshot residue,
Raman spectroscopy.

Opis:

W publikacji przedstawiono rezultaty pilotażowych badań metodą skaningowej mikroskopii elektronowej sprzężonej z mikroanalizą rentgenowską oraz spektroskopii Ramana. Wykazano możliwość identyfikacji składników nieorganicznych oraz niektórych związków organicznych zawartych w pozostałościach powystrzałowych, a także wprowadzono nowy element badawczy w postaci mapowania zmian intensywności pasm niektórych grup funkcyjnych substancji organicznych obecnych w pojedynczym ziarnie. Celem badań jest stopniowe i systematyczne opracowywanie metodyki analizy chemicznej cząstek powystrzałowych pochodzących z amunicji zawierającej ołów oraz z amunicji bezołowiowej, a także opracowanie procedur badawczych dotyczących oznaczania pozostałości po użyciu z broni palnej, w tym typowanie rodzaju materiałów dowodowych i materiału porównawczego oraz wdrożenie ich do rutynowej praktyki opiniodawczej w Biurze Badań Kryminalistycznych ABW. Wskazane jest także opracowanie własnych kryteriów interpretacji wyników badań pozostałości powystrzałowych w celu powiązania osoby podejrzanej z użyciem broni palnej. Należy zaznaczyć, że zrealizowany eksperyment jest jedynie wstępem do podjęcia dalszych, bardziej zaawansowanych badań, prowadzących do identyfikacji, klasyfikacji oraz dyskryminacji mikrośladów pochodzących z przestępstw z udziałem broni.
The paper describes the results of the Raman spectroscopy and scanning electron microscopy equipped with X-ray in the primary analysis of gunshot residues. It demonstrates the ability to identify inorganic components and the organic compounds contained in the gunshot residue, and also introduces a new element of the research in the form of mapping changes in the intensity of bands of some functional groups of organic substances to be found in a single grain. The aim of the research is a gradual and systematical elaboration of the methodology of chemical analysis of gunshot residue particles, originating from ammunition containing lead and unleaded ammunition. Further aim is to develop the testing procedures remains with use of firearms and their implementation in consultative routine practice in the Forensic Laboratory ABW, choosing the type of evidence and comparative materials. In order to relate the person suspected to fact of using firearms, it is advisable to elaborate individual criteria of interpreting the results of gunshot residues study. It should be noted that the conducted experiment determines only a prelude for conducting more advanced researches which lead to the identification, classification and discrimination of microtraces originated from crime use of firearms.

Źródło:

Przegląd Bezpieczeństwa Wewnętrznego; 2017, 9, 16; 157-189
2080-1335
2720-0841

Pojawia się w:

Przegląd Bezpieczeństwa Wewnętrznego

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 11.

Tytuł:

Wear resistance of aluminized steel plates
Odporność na scieranie aluminiowanych taśm stalowych

Autorzy:

Żaba, K.

Powiązania:

https://bibliotekanauki.pl/articles/352691.pdf

Data publikacji:

2011

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

aluminiowana taśma stalowa
odporność na ścieranie
powłoki
chropowatość
aluminized steel plate
abrasion resistance
coatings
roughness
X-ray phase analysis

Opis:

The results of the abrasion resistance measurements of aluminized steel strips are presented in the hereby paper. Steel strips of DX52D+AS120 grade, before and after a heat treatment at temperatures of 200-1000 C for 1 – 5760 minutes, were tested. Tests of the abrasion resistance were carried on in a specially built device: rotating disk – sample performing a plane-rotary motion, with an application of a lubricating medium. Examinations of the abrasion resistance were also performed by means of the block-on-ring tester. Estimations of a coating mass loss, roughness and thickness changes were carried on. The obtained results are illustrated by diagrams and macro- and micro-observations. Phase analysis investigations were also performed on samples selected after the abrasibility testing. The range of the heat treatment parameters – after which the Al-Si coating increased its abrasion resistance – was estimated.
W artykule przedstawiono wyniki badan odpornosci na ścieranie aluminiowanych tasm stalowych. Badaniom poddano taśmy stalowe z gatunku DX52D+AS120 przed i po obróbce cieplnej w temperaturze 200-1000 C w czasie 1min-5760min. Wykonano badania odporności na ścieranie w specjalnie przygotowanym urzadzeniu typu obracająca się tarcza – próbka, wykonujaca ruch posuwisto-zwrotny, przy zastosowaniu środka smarujacego Zrealizowano także badania odporności na zużycie cierne za pomocą testera typu rolka-klocek. Dokonano oceny ubytku masy, zmian chropowatoąci i grubości powłoki. Wyniki badan zobrazowano za pomocą wykresów oraz makro i mikro obserwacji. Przeprowadzono także badania analizy fazowej na próbkach wytypowanych po badaniach ścieralności. Określono taki zakres parametrów obróbki cieplnej, po której następuje wzrost odporności na ścieranie powłoki Al-Si.

Źródło:

Archives of Metallurgy and Materials; 2011, 56, 4; 871-882
1733-3490

Pojawia się w:

Archives of Metallurgy and Materials

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 12.

Tytuł:

Techniki dyfrakcji rentgenowskiej

Autorzy:

Bonarski, J

Powiązania:

https://bibliotekanauki.pl/articles/273763.pdf

Data publikacji:

2013

Wydawca:

Roble

Tematy:

dyfrakcja rentgenowska
mikrostruktura
rentgenowska ilościowa analiza fazowa
RIAF
rentgenowska tomografia teksturowa
RTT
mikroskopia akustyczna
X-ray diffraction
microstructure
X-ray quantitative phase analysis
X-ray texture chromatography
acoustic microscopy

Źródło:

LAB Laboratoria, Aparatura, Badania; 2013, 18, 4; 26-30
1427-5619

Pojawia się w:

LAB Laboratoria, Aparatura, Badania

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 13.

Tytuł:

X-Ray Phase Analysis of Nitrided Layers of X2CrNiMo17-12-2 Austenitic Steel
Rentgenowska analiza fazowa warstw azotowanych stali austenitycznej X2CrNiMo17-12-2

Autorzy:

Frączek, T.
Olejnik, M.
Pilarska, M.

Powiązania:

https://bibliotekanauki.pl/articles/354335.pdf

Data publikacji:

2015

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

X-ray phase analysis
nitrided layers
stal austeniczna X2CrNiMo17-12-2
rentgenowska analiza fazowa
warstwy azotowane
stal austenityczna X2CrNiMo17-12-2

Opis:

This work presents the results of diffraction analyses carried out using X-ray phase analyses (XRD and GIXRD) of nitrided layers of X2CrNiMo17-12-2 austenitic steel. Plasma nitriding process was c arried out in the temperature range of 325 ÷ 400 °C and time of 2 ÷ 4 h. Hydrogen-nitrogen plasma was used as reactive atmosphere (H2 75% + N2 25%) with pressure of 150 Pa. On the basis of the X-ray analyses it was stated that the obtained nitrided layers consisted of a subsurface layer of chromium nitrides and a zone of nitrogen saturated austenite.
W pracy zaprezentowano wyniki badań strukturalnych metodą rentgenowskiej analizy fazowej (XRD i GIXRD) warstw azotowanych na podłożu stali austenitycznej X2CrNiMo17-12-2. Proces azotowania jarzeniowego przeprowadzono w zakresie temperatur 325 ÷ 400 °C i czasu 2 ÷ 4 h. Atmosferę reaktywną stanowiła plazma wodorowo-azotowa (H2 75% + N2 25%) o ciśnieniu 150 Pa. Na podstawie badań rentgenowskich stwierdzono, że otrzymane warstwy azotowane składają się z przypowierzchniowej warstwy azotków chromu oraz strefy austenitu przesyconego azotem. Zastosowanie ekranu aktywnego spowodowało wzrost głębokości dyfuzji azotu w głąb azotowanej powierzchni oraz zwiększyło jego koncentrację w fazie austenitu przesyconego azotem.

Źródło:

Archives of Metallurgy and Materials; 2015, 60, 3A; 2005-2012
1733-3490

Pojawia się w:

Archives of Metallurgy and Materials

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 14.

Tytuł:

Characterisation of Mg-Zn-Ca-Y powders manufactured by mechanical milling

Autorzy:

Lesz, S.
Tański, T.
Hrapkowicz, B.
Karolus, M.
Popis, J.
Wiechniak, K.

Powiązania:

https://bibliotekanauki.pl/articles/1818808.pdf

Data publikacji:

2020

Wydawca:

Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach

Tematy:

Mg-based alloys
scanning electron microscopy
X-ray diffraction analysis
mechanical alloying
stopy magnezu
skaningowa mikroskopia elektronowa
rentgenowska analiza dyfrakcyjna
mechaniczna synteza

Opis:

Purpose: This paper explains mechanical synthesis which uses powders or material chunks in order to obtain phases and alloys. It is based on an example of magnesium powders with various additives, such as zinc, calcium and yttrium. Design/methodology/approach: The following experimental techniques were used: X-ray diffraction (XRD) method, scanning electron microscopy (SEM), determining particle size distributions with laser measuring, Vickers microhardness. Findings: The particle-size of a powder and microhardness value depend on the milling time. Research limitations/implications: Magnesium gained its largest application area by creating alloys in combination with other elements. Magnesium alloys used in various industry contain various elements e.g. rare-earth elements (REE). Magnesium alloys are generally made by casting processes. Consequently, the search for new methods of obtaining materials such as mechanical alloying (MA) offers new opportunities. The MA allows for the production of materials with completely new physico-chemical properties. Originality/value: Thanks to powder engineering it is possible to manufacture materials with specific chemical composition. These materials are characterized by very high purity, specified porosity, fine-grain structure, complicated designs. These are impossible to obtain with traditional methods. Moreover it is possible to refine the process even further minimalizing the need for finishing or machining, making the material losses very small or negligible. Furthermore material manufactured in such a way can be thermally or chemically processed without any problems.

Źródło:

Journal of Achievements in Materials and Manufacturing Engineering; 2020, 103, 2; 49--59
1734-8412

Pojawia się w:

Journal of Achievements in Materials and Manufacturing Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 15.

Tytuł:

Określanie właściwości popiołów lotnych przy użyciu różnych metod i urządzeń badawczych
Determination of fly ashes properties with use of different research methods and measuring devices

Autorzy:

Szponder, D. K.
Trybalski, K.

Powiązania:

https://bibliotekanauki.pl/articles/349933.pdf

Data publikacji:

2009

Wydawca:

Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH

Tematy:

popiół lotny
analiza densymetryczna
pomiar powierzchni właściwej
analiza granulometryczna
rentgenowska analiza dyfrakcyjna
mikroskopia skaningowa
mikroanaliza rentgenowska
analiza termiczna
fly ash
density measurement
specific surface measurements
grain size analysis
X-ray diffraction analysis
scanning microscopy
X-ray microanalysis
thermal analysis

Opis:

Popioły lotne są uciążliwymi odpadami, powstającymi z substancji mineralnych zdyspergowanych w węglu, które w wyniku jego spalenia ulegają wielu procesom fizykochemicznym. Ze względu na zastosowanie różnych metod spalania węgla, różnorodnego składu paliwa, wysoki stopień dyspersji substancji mineralnych paliwa oraz gwałtowność procesów termicznych, ziarna popiołu wykazują wysoki stopień zróżnicowania morfologicznego, składu fazowego i chemicznego. Sprawia to, że poszczególne rodzaje popiołów lotnych znacznie różnią się właściwościami, dlatego też dobór odpowiedniej metody ich utylizacji wymaga dogłębnego poznania ich właściwości fizyko-chemicznych i mineralogicznych. W publikacji zaprezentowano wybrane metody i urządzenia pomiarowe wykorzystywane do określania właściwości fizycznych surowców i odpadów mineralnych, a także ukazano możliwości ich zastosowania do scharakteryzowania właściwości popiołów lotnych.
Fly ash is noxious waste that comes from minerals substances dispersed in coal and are subjected to many physical and chemical processes during coal combustion. Because of different types of coals, different types of combustion, a high level of dispersion of mineral substances in coals and the duration of thermal processes, the particles of fly ash are diversified as to their structure, phase and chemical composition. The diversity of produced fly ash makes it necessary to determinate their physical, chemical and mineralogical properties in order to select suitable utilization method. This paper presents a few research methods and measuring devices used to determine physical, chemical and mineralogical properties of raw and waste materials and also their usefulness to characterize fly ashes properties.

Źródło:

Górnictwo i Geoinżynieria; 2009, 33, 4; 287-298
1732-6702

Pojawia się w:

Górnictwo i Geoinżynieria

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 16.

Tytuł:

Clay minerals as palaeoenvironmental indicators in the Bathonian (Middle Jurassic) ore-bearing clays from Gnaszyn, Kraków-Silesia Homocline

Autorzy:

Dudek, T.

Powiązania:

https://bibliotekanauki.pl/articles/139440.pdf

Data publikacji:

2012

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

analiza ilościowa
chloryn
dyfrakcja rentgenowska
glaukonit
illit
iły
kaolin
Skład minerałów
chlorite
clays
glauconite
illite
kaolinite
Mineral assemblage
X-ray diffraction quantitative analysis

Opis:

This paper reports the results of X-ray diffraction quantitative mineralogical studies of the clay-rich Middle Jurassic sedimentary rocks from Gnaszyn, central Poland and their palaeoenvironmental interpretation. The palaeoenvironmental interpretation is aided by the fact that the sediments have not been significantly altered by diagenesis. The mineral composition is uniform throughout the succession: quartz, K-feldspar, plagioclase, calcite, gypsum, anhydrite, pyrite, illite, kaolinite, chlorite, and glauconite. The clay assemblage is dominated by illite, which alone accounts for about 20 wt% of the total mineral content. Kaolinite amounts usually <10 wt% and chlorite and glauconite occur in subordinate quantities. The clay mineral assemblage is largely of detrital origin and indicates rather cool and/or dry climatic conditions favouring mechanical erosion of the source rocks.

Źródło:

Acta Geologica Polonica; 2012, 62, 3; 297-305
0001-5709

Pojawia się w:

Acta Geologica Polonica

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 17.

Tytuł:

Study of phase and chemical composition of Bi1-xNdxFeO3 powders derived by pressureless sintering
Badanie składu fazowego oraz chemicznego proszków Bi1-xNdxFeO3 spiekanych swobodnie

Autorzy:

Dzik, J.
Lisińska-Czekaj, A.
Zarycka, A.
Czekaj, D.

Powiązania:

https://bibliotekanauki.pl/articles/353066.pdf

Data publikacji:

2013

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

BiFeO3 ceramics
Nd3+ doping
X-ray phase and structural analysis
ceramika BiFeO3
rentgenowska analiza fazowa i strukturalna

Opis:

In the present paper studies on Bi_1-xNd_xFeO₃ for x =0.1-0.4 are reported. The mixed oxide method followed with pressureless sintering was employed for ceramics fabrication. Thermal behavior of stoichiometric mixtures of simple oxide powders, viz. Bi₂O₃, Nd₂O₃ and Fe₂O₃ was studied by simultaneous thermal analysis. It was found that with an increase in neodymium content the weight loss increased from 0.75% to 3.16% for x =0.1 and x =0.4, respectively. It was found that weight loss took place mainly within two temperature ranges, namely ΔT1 ≈(300-400)0C and ΔT2 ≈(600-800)°C. Bi_1-xNd_xFeO₃ ceramics was studied in terms of its phase composition (X-ray phase analysis) and chemical composition (EDS method) at room temperature. It was found that Bi_1-xNd_xFeO₃ suffered structural phase transition from rhombohedral to orthorhombic symmetry with an increase in neodymium concentration x within the range x =(0.2-0.3).
W niniejszej pracy zaprezentowano wyniki badań ceramiki Bi_1-xNd_xFeO₃ dla x =0,1-0,4. Do wytworzenia ceramiki zastosowano metodę reakcji w fazie stałej z mieszaniny tlenków wyjściowych Bi₂O₃, Nd₂O₃ i Fe₂O₃ spiekanej swobodnie w atmosferze powietrza. Analiza termiczna stechiometrycznej mieszaniny proszków wykazała wzrost ubytku masy proszku przy wzroście zawartości (x) neodymu w mieszaninie (od 0,75% do 3,16% dla x =0,1 i x =0,4 odpowiednio). Stwierdzono, że ubytek masy zachodzi głównie w dwóch zakresach temperatury, a mianowicie ΔT1 ≈ (300-400)°C i ΔT2 ≈ (600-800)°C. Ceramika Bi_1-xNd_xFeO₃ została poddana charakterystyce składu fazowego (rentgenowska analiza fazowa) oraz składu chemicznego (metoda EDS) w temperaturze pokojowej. Stwierdzono, że Bi_1-xNd_xFeO₃ przejawia strukturalną przemianę fazową z fazy romboedrycznej do rombowej przy wzroście koncentracji neodymu w zakresie x =(0.2-0.3).

Źródło:

Archives of Metallurgy and Materials; 2013, 58, 4; 1371-1376
1733-3490

Pojawia się w:

Archives of Metallurgy and Materials

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 18.

Tytuł:

Transformacje strukturalne w kryształach wywołane reakcjami fotochemicznymi
Structural transformations in crystals induced by photochemical reactions

Autorzy:

Turowska-Tyrk, I.
Bąkowicz, J.

Powiązania:

https://bibliotekanauki.pl/articles/171650.pdf

Data publikacji:

2014

Wydawca:

Polskie Towarzystwo Chemiczne

Tematy:

reakcje fotochemiczne w kryształach
struktura kryształu
struktura cząsteczki
zmiany strukturalne
rentgenowska analiza strukturalna
krystalografia
photochemical reactions in crystals
crystal structures
molecular structure
structural changes
X-ray structure analysis
crystallography

Opis:

Structural changes induced in crystals by photochemical reactions were presented. The changes concern: a) the distances between neighbouring reactant molecules and their mutual orientation in the case of intermolecular reactions, b) the distances and angles between fragments of a molecule for intramolecular reactions, c) the position of molecules in crystals, d) geometry of hydrogen bonds, e) cell constants, and f) the content of product molecules in crystals. For most intramolecular reactions, the distances between reactive atoms are constant for a long time in phototransformation and decrease rapidly at its end (Figs. 3 and 5). In the case of intermolecular reactions, the distances between reactive atoms of reactant molecules decrease linearly along with the phototransformation of crystals (Fig. 7). Additionally, unreacted molecules become, to a certain degree, similar to product molecules in terms of their shape (Figs, 4 and 8). Reactant and product molecules do not assume a fixed place in crystals. Product molecules change their orientation towards that of which is observed in a pure product crystal and reactant molecules gradually move away from the position they took in pure reactant crystals. All this has an influence on the geometry of hydrogen bonds existing in crystals (Fig. 9). The above-mentioned structural transformations find their expression in values of cell constants (Fig. 10). The factors influencing the photoreactivity of molecules in crystals were also described. Knowledge of crystal and molecular structures of partly reacted crystals, determined thanks to X-ray structure analysis which is a branch of crystallography, reveals the behaviour of molecules in crystals in which photochemical reactions proceed and helps to understand a pathway of these reactions.

Źródło:

Wiadomości Chemiczne; 2014, 68, 5-6; 381-402
0043-5104
2300-0295

Pojawia się w:

Wiadomości Chemiczne

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 19.

Tytuł:

Application of X-Ray Diffraction to Analyse Phase Composition of Aluminium Alloys for Plastic Working

Autorzy:

Pachut, K.
Żelechowski, J.
Boczkal, S.

Powiązania:

https://bibliotekanauki.pl/articles/354144.pdf

Data publikacji:

2019

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

aluminium alloys
X-ray diffraction
qualitative phase analysis

Opis:

An attempt was made to determine phase composition of commercial aluminium alloys using X-ray diffraction. Samples for phase composition analysis were selected from the group of aluminium alloys covered by the EN 573-3:2013 standard [1]. Representative samples were taken from eight groups of alloys with different chemical composition (at least one sample from each group). The diffraction intensity was measured with a standard X-ray diffractometer in Bragg-Brentano geometry in a way that allowed identification of the weakest diffraction peaks. As a results of the performed research it has been shown that X-ray phase analysis can be used to identify the matrix of aluminium alloys, Si and crystalline intermetallic phases such as Mg₂Si, Al_93.38Cu_6.02Fe₂₄Si_16.27, Al_4.01MnSi_0.74, MgZn₂, Al₁₇ (Fe_3.2Mn_0.8)Si₂, Al₆₅Cu₂₀Fe₁₅, and Cu₃Mn₂Al. The detectability limit of the above-mentioned phases is better than 0.5%. The research has also shown that X-ray phase analysis is applicable in the investigation of phase transformations taking place in aluminium alloys.

Źródło:

Archives of Metallurgy and Materials; 2019, 64, 4; 1315-1319
1733-3490

Pojawia się w:

Archives of Metallurgy and Materials

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 20.

Tytuł:

Wykorzystanie przekształceń obrazowych do poprawy czytelności zdjęć RTG
Application of image transformations in improvement of readability of X-ray images

Autorzy:

Szarek, A.

Powiązania:

https://bibliotekanauki.pl/articles/98945.pdf

Data publikacji:

2008

Wydawca:

Politechnika Śląska. Katedra Biomechatroniki

Tematy:

zdjęcia RTG
promieniowanie rentgenowskie
analiza obrazów
analiza komputerowa
diagnostyka medyczna
X-ray images
X-ray
image analysis
computer analysis
medical diagnostics

Opis:

Do prawidłowej oceny zmian układu kostnego oraz przebudowy kości po implantacji protezy niezbędna jest dobra jakość RTG. Nie zawsze jednak po wywołaniu kliszy możliwa jest jednoznaczna ocena zmian ze względu na słabą jakość zdjęcia, a dodatkowe prześwietlenie pacjenta wiąże się z zwiększeniem dawki promieniowania. W artykule podjęto próbę przystosowania komputerowej analizy obrazu do poprawy czytelności zdjęć RTG.
More and more advanced diagnostics technologies enable very precise assessment of skeleton state and determination of degenerative changes. Due to the fact that top diagnostics technologies are very expensive, X-ray images are mostly taken. In order to perform proper assessment of changes in bone system and bone remodelling after prosthesis implantation, a high quality of X-ray images is necessary. However, unequivocal assessment of changes is not always possible after film developing due to low quality of images and additional X-ray examination is connected with patient being exposed to increased radiation dose. This paper describes the attempts made to adjust computer image analysis in order to improve readability of X-ray images.

Źródło:

Aktualne Problemy Biomechaniki; 2008, 2; 151-154
1898-763X

Pojawia się w:

Aktualne Problemy Biomechaniki

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 21.

Tytuł:

Computer system for analysis of X-ray images of wheat grains

Autorzy:

Strumillo, A.
Niewczas, J.
Szczypinski, P.
Makowski, P.
Wozniak, W.

Powiązania:

https://bibliotekanauki.pl/articles/24261.pdf

Data publikacji:

1999

Wydawca:

Polska Akademia Nauk. Instytut Agrofizyki PAN

Tematy:

wheat
grain
computer system
X-ray image
image analysis

Źródło:

International Agrophysics; 1999, 13, 1
0236-8722

Pojawia się w:

International Agrophysics

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 22.

Tytuł:

Thermal decomposition characterization of supergene potassium-jarosite and sodium-jarosite minerals from the northern Tibetan Plateau, China

Autorzy:

Chen, L.

Powiązania:

https://bibliotekanauki.pl/articles/949691.pdf

Data publikacji:

2018

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

potassium-jarosite
sodium-jarosite
thermogravimetric analysis
X-ray diffraction

Opis:

The thermal decomposition of supergene potassium-jarosite and sodium-jarosite samples from the weathering profiles of sulfide deposits in the northern Tibetan Plateau, China, was investigated. Electron microprobe, scanning electron microscopy, and X-ray diffraction analyses indicated the presence of nearly pure potassium-jarosite and sodium-jarosite. Thermogravimetric analysis of the potassium-jarosite sample revealed mass losses of 11.39 wt% at 443.0 °C, 20.99 wt% at 688.3 °C, and 3.18 wt% at 779.3 °C. The thermogravimetric analysis of sodium-jarosite revealed mass losses of 11.72 wt% at 447.5 °C, 21.32 wt% at 682.6 °C, and 3.70 wt% at 716.5 °C. The results provide no evidence for water-molecule loss below 400 °C, as has been reported previously for natural potassium-jarosite and sodium-jarosite. Thermal-decomposition mechanisms have been proposed for potassium-jarosite and sodium-jarosite based on X-ray diffraction analyses of samples obtained at distinct points along the respective thermal decomposition processes. A comparison of the thermal analysis patterns of potassium-jarosite and sodium-jarosite indicates that sodium-jarosite undergoes the initiation of lattice destruction at a higher temperature.

Źródło:

Physicochemical Problems of Mineral Processing; 2018, 54, 2; 459-466
1643-1049
2084-4735

Pojawia się w:

Physicochemical Problems of Mineral Processing

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 23.

Tytuł:

Determination of Stress Values in the Surface Layer of Inconel 718 Samples Dedicated to Fatigue Tests

Autorzy:

Gadalińska, Elżbieta
Michałowski, Andrzej
Czarnewicz, Sławomir

Powiązania:

https://bibliotekanauki.pl/articles/97839.pdf

Data publikacji:

2019

Wydawca:

Sieć Badawcza Łukasiewicz - Instytut Lotnictwa

Tematy:

turning
grinding
X-ray diffraction
stress analysis
Inconel 718

Opis:

This work deals with the problem of X-ray stress determination on the samples dedicated to fatigue tests. A number of research studies point out the fact that the processing of hard, difficult to machine materials like nickel superalloys, reveals more than one trend of residual stress versus working parameters of behaviour (Lavella and Berruti, 2010). Many papers have shown that the residual stresses are dependent on a combination of a number of factors. When the above is taken into account simultaneously with the requirements of the internal General Electric specification for the fatigue tests samples preparation (Metallic test specimen preparation, low stress, 2017) the problem of turning and grinding parameters gathers significance. It is well known that the quality of the surface layer, produced during machining, is of vital importance for the fatigue life specially for the components of aircraft produced form nickel superalloys e.g. Inconel 718 (Kortabarri et al., 2011). That is why the surface layer’s properties are described in detail by the standards. The aim of the work is to determine one of the most influential features from the point of view of fatigue life, i.e. the stress state on the surface layer with one non-destructive method - the diffraction analysis.

Źródło:

Fatigue of Aircraft Structures; 2019, 11; 78-86
2081-7738
2300-7591

Pojawia się w:

Fatigue of Aircraft Structures

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 24.

Tytuł:

Handheld ED-XRF spectrometers in geochemical investigation: Comparative studies for glacial deposits from Spitsbergen

Autorzy:

Kozak, Lidia
Silva Souza, Juliana
Nawrot, Adam
Proch, Jędrzej
Kaźmierski, Marcin
Zawieja, Agnieszka
Niedzielski, Przemysław

Powiązania:

https://bibliotekanauki.pl/articles/16538450.pdf

Data publikacji:

2021

Wydawca:

Polska Akademia Nauk. Czasopisma i Monografie PAN

Tematy:

Arctic
Svalbard
X-Ray fluorescence
metals
statistical analysis
spatial distribution

Opis:

This study presents the determination of the content of selected metals (Ba, Ca, Fe, Nb, Rb, Sr, Y, Zn, and Zr) in postglacial deposits from two glacial valleys (Ebbadalen and Elsadalen) in the Petunia Bay (southern Spitsbergen). The aim of the research was to experimentally check the usefulness of the handheld energy dispersive X-ray fluorescence technique in the study of samples from the polar zone, before performing the future field tests. Deposit analyses were performed (in parallel) with two handheld X-ray fluorescence spectrometers from different manufacturers, to investigate the accuracy and reliability of the instruments. The statistical analysis of the results indicated that the measurements carried out with two spectrometers were statistically significantly different, which was probably due to the different calibration characteristics used by the manufacturers. However, the analysis of the spatial distribution of element concentrations using Geographic Information System tools showed that the distribution maps of elements concentrations were similar regardless of the spectrometer used in the analyses.

Źródło:

Polish Polar Research; 2021, 42, 3; 163-172
0138-0338
2081-8262

Pojawia się w:

Polish Polar Research

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 25.

Tytuł:

Attempt to application of image processing to evaluation of changes in internal structure of wheat grain

Autorzy:

Niewczas, J.
Wozniak, W.
Guc, A.

Powiązania:

https://bibliotekanauki.pl/articles/24976.pdf

Data publikacji:

1995

Wydawca:

Polska Akademia Nauk. Instytut Agrofizyki PAN

Tematy:

computer analysis
internal structure
grain
wheat grain
X-ray image
kernel
image analysis

Źródło:

International Agrophysics; 1995, 09, 4
0236-8722

Pojawia się w:

International Agrophysics

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 26.

Tytuł:

Trace elements in scalp hair of leukaemia patients

Autorzy:

Khuder, A.
Bakir, M. A.
Hasan, R.
Mohammad, A.
Habil, K.

Powiązania:

https://bibliotekanauki.pl/articles/971518.pdf

Data publikacji:

2014

Wydawca:

Instytut Chemii i Techniki Jądrowej

Tematy:

leukaemia
principal component analysis
scalp hair
U-test
X-ray fluorescence

Opis:

The aim of this study was to determine the concentration of Fe, Ni, Cu, Zn and Pb in scalp hair of leukaemia patients and healthy volunteers, using the optimised XRF method. Leukaemia hair samples were classifi ed corresponding to type, growth and age of the participants. The results showed that the studied trace elements (TEs) in both of leukaemia and control groups were positively skewed. In comparison with the control group, lower Fe, Cu, Zn and Pb and higher of Ni medians were found in all studied leukaemia patients. The median rank obtained by Mann–Whitney U-test revealed insignifi cant differences between the leukaemia patients subgroups and the controls. An exact probability (α < 0.05) associated with the U-test showed signifi cant differences between medians in leukaemia patients and controls groups for Pb (lymphatic/control, acute/control), Cu (lymphatic/control, chronic/control), Ni (lymphatic/control, chronic/control) and Fe (chronic/control). Very strong positive and negative correlations (r > 0.70) in the scalp hair of control group were observed between Ni/Fe-Ni, Cu/Fe-Cu, Zn/Fe-Zn, Pb/Fe-Pb, Cu/Ni-Zn/Ni, Cu/Ni-Pb/Ni, Zn/Ni-Pb/Ni, Zn/Fe-Zn/Cu, Pb/Ni-Ni and Ni/Fe-Pb/Ni, whereas only very strong positive ratios in the scalp hair of leukaemia patients group were observed between Ni/Fe-Ni, Cu/Fe-Cu, Zn/Fe-Zn and Pb/Fe-Pb, all correlations were signifi cant at p < 0.05. Other strong and signifi cant correlations were also observed in scalp hair of both groups. Signifi cant differences between grouping of studied TEs in all classifi ed leukaemia groups and controls were found using principal component analysis (PCA). The results of PCA confi rmed that the type and the growth of leukaemia factors were more important in element loading than the age factor.

Źródło:

Nukleonika; 2014, 59, 3; 111-120
0029-5922
1508-5791

Pojawia się w:

Nukleonika

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 27.

Tytuł:

Phase Composition of Urban Soils by X-Ray Diffraction and Mössbauer Spectroscopy Analysis

Autorzy:

Kierlik, P.
Hanc-Kuczkowska, A.
Męczyński, R.
Matuła, I.
Dercz, G.

Powiązania:

https://bibliotekanauki.pl/articles/353120.pdf

Data publikacji:

2019

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

Mössbauer spectroscopy
X-ray diffraction
environmental protection
qualitative phase analysis
topsoil

Opis:

The main purpose of this study was to identify the mineral composition of soil sample taken from the upper layer of topsoil. High absorption of chemical substance is a characteristic for humus-organic layer of topsoil. The source of those substance could be a pollutant emitted to the atmosphere by human activity. The research area includes Upper Silesia region, which is the most industrial region of Poland. In the present study, the phase composition of the top soil separates were analyzed by using X-raydiffraction and Mössbauer spectroscopy. X-ray diffraction analysis revealed the presence of seven mineral phases in the material magnetic separated by lower current (quartz, illite, kaolinite, Fe³⁺ oxides, hematite, magnetite and pyrite). In case of higher current were identified four phases (quartz, muscovite, kaolinite and K_0.94 Na_0.06 (AlSi₃ O₈ )). Mössbauer spectroscopy was used for an extensive analysis of iron-containing phases (pyrrhotite, magnetite, aluminosilicate oxides with Fe³⁺ and kaolinite/Fe²⁺ silicate).

Źródło:

Archives of Metallurgy and Materials; 2019, 64, 3; 1029-1032
1733-3490

Pojawia się w:

Archives of Metallurgy and Materials

Dostawca treści:

Biblioteka Nauki

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Skocz do pozycji: 28.

Tytuł:

Synthesis, Spectral Characterization and X – Ray Diffraction studies of some Pd(II) Complexes with Schiff bases

Autorzy:

Shaikh, J. A.

Powiązania:

https://bibliotekanauki.pl/articles/412548.pdf

Data publikacji:

2014

Wydawca:

Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN

Tematy:

Pd(II) complexes
Schiff bases
Structural analysis
X-ray diffraction studies

Opis:

The synthesis, spectroscopic and X – Ray Diffraction studies of some Pd(II) complexes with bidentate Schiff bases are reported here. These Schiff bases were derived by condensing aldehydes like 2-hydroxy-1-naphthaldehyde, 5-chloro salicyladehyde with amines like 4-nitro aniline, 4-methyl aniline and 4-methoxy aniline. The complexes were characterized on the basis of elemental analysis, molar conductivity, spectral (IR, 1H and electronic) as well as thermal analysis. All the Pd (II) complexes exhibit square planar geometry with 1:2 (metal : ligand) stoichiometry. The X- ray diffraction studies suggest monoclinic crystal system for these complexes.

Źródło:

International Letters of Chemistry, Physics and Astronomy; 2014, 17, 3; 272-280
2299-3843

Pojawia się w:

International Letters of Chemistry, Physics and Astronomy

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 29.

Tytuł:

Wykorzystanie techniki fluoroscencji rentgenowskiej (XRF) do szybkiej analizy pierwiastkowej biomasy

Autorzy:

Kubik, W.

Powiązania:

https://bibliotekanauki.pl/articles/274379.pdf

Data publikacji:

2017

Wydawca:

Roble

Tematy:

fluorescencja rentgenowska
XRF
biomasa
analiza pierwiastkowa
X-ray fluorescence
biomass
elemental analysis

Źródło:

LAB Laboratoria, Aparatura, Badania; 2017, 22, 1; 30-34
1427-5619

Pojawia się w:

LAB Laboratoria, Aparatura, Badania

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 30.

Tytuł:

Application of X-ray fluorescence method for elemental analysis of PM2.5 fraction

Autorzy:

Samek, L.
Furman, L.
Kawik, T.
Welnogorska, K.

Powiązania:

https://bibliotekanauki.pl/articles/971541.pdf

Data publikacji:

2015

Wydawca:

Instytut Chemii i Techniki Jądrowej

Tematy:

air pollution
energy dispersive X-ray fluorescence (EDXRF)
elemental analysis
particulate matter

Opis:

The scientific interest in air pollution comes from its influence on human health, the condition of cultural heritage and climate. The PM2.5 fraction (particles of a diameter of 2.5 mm or below), indirectly, has a significant impact on health which is associated with respiratory tract and blood vessel related diseases. However, not only the size, but also the content of the particles has a significant meaning. To determine the particulate matter contents, elemental analysis can be performed using numerous techniques, the most important of which is X-ray fluorescence. In this study, samples of PM2.5 fraction collected in Krakow, Poland were analyzed. The X-ray fluorescence method was used to perform elemental analysis. The gravimetric method was applied to determine the concentration of the PM2.5 fraction. Low detection limits of individual elements and precision of the X-ray fluorescence method were determined. The concentrations of the following elements: Cl, K, Ca, Cr, Mn, Fe, Cu, Zn, Br, Rb, Sr and Pb in the PM2.5 fraction samples collected in Krakow were evaluated. The homogeneity of the samples was also estimated. The concentrations of PM2.5 fraction collected in the summer of 2013 were in the range of 6–23 ng/m3. The concentrations of PM2.5 fraction collected in the winter of 2013 were in the range of 26–171 ng/m3. The precision of the method was found to be below 1% for elements with high concentration in the sample and 6–8 % for trace elements.

Źródło:

Nukleonika; 2015, 60, No. 3, part 2; 621-626
0029-5922
1508-5791

Pojawia się w:

Nukleonika

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 31.

Tytuł:

Quantitative X-Ray Diffraction Analysis of Zn-Al Based Alloys

Autorzy:

Gogola, P.
Gabalcová, Z.
Suchánek, H.
Babinec, M.
Bonek, M.
Kusý, M.

Powiązania:

https://bibliotekanauki.pl/articles/353557.pdf

Data publikacji:

2020

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

hot-dip coating
quantitative x-ray diffraction
image analysis
Zn-Al alloy

Opis:

The paper describes modification to Fm3 ̅m (space group no. 225) lattice of aluminium based α-solid solution observed in Zn-Al alloys required to properly correlate quantitative data from X-ray diffraction analysis with results obtained from quantitative scanning electron microscopy image analysis and those predicted from Zn-Al binary phase diagram. Results suggests that 14 at.% of Zn as a solute atom should be introduced in crystal lattice of aluminium to obtain correct estimation of phase quantities determined by quantitative X-ray diffraction analysis. It was shown that this modification holds for Cu mould cast as well as annealed and water-cooled samples of Zn-3wt.%. Al and Zn-5wt.% Al.

Źródło:

Archives of Metallurgy and Materials; 2020, 65, 2; 959-966
1733-3490

Pojawia się w:

Archives of Metallurgy and Materials

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 32.

Tytuł:

Major, minor, and trace elements in whole blood of patients with different leukemia patterns

Autorzy:

Khuder, A.
Bakir, M. A.
Solaiman, A.
Issa, H.
Habil, K.
Mohammad, A.

Powiązania:

https://bibliotekanauki.pl/articles/146612.pdf

Data publikacji:

2012

Wydawca:

Instytut Chemii i Techniki Jądrowej

Tematy:

leukemia
principal component analysis
Student's t test
whole blood
X-ray fluorescence

Opis:

The elemental sensitivity method for X-ray fluorescence analysis was applied to determine S, Cl, K, Ca, Fe, Cu, Zn, Br, and Rb in the whole blood of leukemia patients and healthy volunteers. Leukemia samples were classified according to type, growth, and age of participants. Student’s t-test results showed that, the mean concentration of the studied elements was significantly lower in leukemia patients than that in controls. Strong mutual correlations (r greather than 0.50) in the whole blood of leukemia patients were observed between S-Ca, K-Fe, K-Ca, Fe-Zn, K-Zn, K-Rb, Fe-Rb, Zn-Rb, S-Cl, S-K, Ca-Fe, Cl-Ca, and Ca-Rb; whereas, S-K, S-Ca, S-Cl, Cl-K, Cl-Ca, Fe-Zn, Zn-Rb, Fe-Rb, K-Fe, and Zn-Br exhibited strong relationships (r greather than 0.50) in the whole blood of controls, all were significant at p less than 0.05. Significant differences between grouping of studied elements in the control group and all classified leukemia groups, except younger age-group, were obtained using principal component analysis. The study indicated appreciably different patterns of element distribution and mutual relationships in the whole blood of leukemia patients in comparison with controls.

Źródło:

Nukleonika; 2012, 57, 3; 389-399
0029-5922
1508-5791

Pojawia się w:

Nukleonika

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 33.

Tytuł:

Benzofuroxan (Benzo[1,2-c]1,2,5-oxadiazole N-oxide) Derivatives as Potential Energetic Materials: Studies on Their Synthesis and Properties

Autorzy:

Šarlauskas, J.
Anusevičius, Z.
Misiunas, A.

Powiązania:

https://bibliotekanauki.pl/articles/358164.pdf

Data publikacji:

2012

Wydawca:

Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego

Tematy:

heterocyclic nitro compounds
X-ray diffraction
structure analysis
density
HEDM
5,6-DNBF

Opis:

The objective of this work was to prepare benzofuroxan derivatives as new, dense, potentially energetic materials and to investigate their properties, with the main focus being on 5,6-dinitrobenzofuroxan (5,6-DNBF). 5,6-DNBF was prepared by a 3-step reaction sequence: a) 1-azido-3-nitrobenzene was synthesized by diazotation of 3-nitroaniline with sodium nitrite and subsequent reaction with sodium azide in acetic/sulfuric mixed acids; b) it was nitrated with HNO3/H2SO4 to 1-azido-2,4,5-trinitrobenzene; c) thermal cyclization of the latter compound in a polar solvent gave the desired 5,6-DNBF (m.p. 177 °C). It was fully characterized by UV/VIS, FT-IR and NMR spectroscopy, mass spectrometry and single crystal X-ray diffraction. The density of the compound (X-ray) was found to be comparatively high (1.88 g/cm3), and to be superior to the previously known, isomeric energetic material ? 4,6-dinitrobenzofuroxan (4,6-DNBF) (1.76 g/cm3). Furthermore, the synthesis of some other benzofuroxan derivatives, potentially interesting as high energy, density materials (HEDMs), has been carried out. The densities of the compounds obtained were calculated using ACD Labs software (version 4.0). Based on the results obtained, it could be concluded that 5,6-DNBF is one of the densest nitro derivatives of the benzofuroxan series, comparable to CL-14, CL-17, CL-18, and thus could have potential applications as an HEDM.

Źródło:

Central European Journal of Energetic Materials; 2012, 9, 4; 365-386
1733-7178

Pojawia się w:

Central European Journal of Energetic Materials

Dostawca treści:

Biblioteka Nauki

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Skocz do pozycji: 34.

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

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Skocz do pozycji: 35.

Tytuł:

Halloysite intercalated by potassium acetate

Autorzy:

Mariusz, Adamczyk
Katarzyna, Małycha
Karol, Kułacz
Michał, Pocheć
Kazimierz, Orzechowski

Powiązania:

https://bibliotekanauki.pl/articles/1450347.pdf

Data publikacji:

2020

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

clay minerals
electron microscopy
XRD
X-ray diffraction
TGA
thermogravimetric analysis
dielectric spectroscopy

Opis:

Halloysite was intercalated by the mechanochemical technique from dry components. The process efficiency of 50% was achieved. The obtained intercalate differed from the material acquired using an aqueous solution of potassium acetate. The material was analyzed employing electron microscopy, thermogravimetry, X-ray powder diffraction, and dielectric spectroscopy. It was found that the molecules and/or ions present in the interlayer spaces retain some possibility of movement. This property of the material is promising for potential application as low expensive absorbers of electromagnetic radiation.

Źródło:

Physicochemical Problems of Mineral Processing; 2020, 56, 6; 235-243
1643-1049
2084-4735

Pojawia się w:

Physicochemical Problems of Mineral Processing

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 36.

Tytuł:

Non-invasive analysis and visualization of objects from FSW AlSi9Mg/2017A aluminum alloy joints
Nieinwazyjna analiza i wizualizacja obiektów w złączach AlSi9Mg/2017A wytwarzanych metodą Friction Stir Welding

Autorzy:

Wójcicka, A.
Mroczka, K.
Kowalski, M.

Powiązania:

https://bibliotekanauki.pl/articles/264301.pdf

Data publikacji:

2018

Wydawca:

Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH

Tematy:

X-ray microtomography
image analysis
aluminum alloys
FSW
mikrotomografia komputerowa
analiza obrazów
stopy aluminium

Opis:

Friction stir welding (FSW) technology allows for the welding of materials that differ in their chemical compositions, microstructures, and properties. When selecting the parameters, it is necessary to analyze the structure of a weld and eliminate the defects. The use of X-ray microtomography creates the possibility of precise imaging of a joint structure – especially when it contains defects (voids). The tests were carried out on an FSW joint made with both 2017A and AlSi9Mg aluminum alloys. The macrostructure was cross-sectional, and a defect was found in the middle part of the joint and on the advancing side. We used a conventional method of observation light microscopy. Then, an analysis was performed using X-ray microtomography, which revealed the shape of the defect in 3D. Individual cross-sections were extracted, which enabled us to measure the geometric quantities. A dependence was found for the shape of the defect on the welding parameters and the variability of its construction. The usefulness of this advanced material imaging technology for the analysis of FSW welds has been confirmed.
Technologia FSW umożliwia zgrzewanie materiałów różniących się składem chemicznym, mikrostrukturą i właściwościami. Przy doborze parametrów konieczna jest analiza struktury złącza i eliminacja ewentualnych wad. Zastosowanie mikrotomografii komputerowej umożliwia precyzyjne obrazowanie budowy złącza, szczególnie gdy zawiera wady (pustki). Badania przeprowadzono na złączu FSW stopów aluminium 2017A i AlSi9Mg. Zbadano makrostrukturę na przekroju poprzecznym i stwierdzono obecność wady w środkowej części złącza i po stronie natarcia. Zastosowano konwencjonalną metodę obserwacji – mikroskopię świetlną. Następnie wykonano analizę złącza z zastosowaniem tomografii komputerowej, która ujawniła kształt wady w wymiarze 3D. Wyekstrahowano poszczególne przekroje, które umożliwiły wykonanie pomiarów wielkości geometrycznych. Stwierdzono zależność kształtu wady od parametrów zgrzewania oraz zmienność jej budowy. Potwierdzono przydatność tej zaawansowanej technologii obrazowania budowy materiałów do analizy złącz FSW.

Źródło:

Metallurgy and Foundry Engineering; 2018, 44, 3; 145-152
1230-2325
2300-8377

Pojawia się w:

Metallurgy and Foundry Engineering

Dostawca treści:

Biblioteka Nauki

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Skocz do pozycji: 37.

Tytuł:

Rentgenowska dyfraktometria proszkowa w badaniach zabytkowych obiektów. Nowe możliwości badawcze na Wydziale Chemii UJ

Autorzy:

Grzesiak, Marta
Oszajca, Marcin
Rafalska-Łasocha, Alicja
Łasocha, Wiesław

Powiązania:

https://bibliotekanauki.pl/articles/636614.pdf

Data publikacji:

2011

Wydawca:

Uniwersytet Jagielloński. Wydawnictwo Uniwersytetu Jagiellońskiego

Tematy:

X-ray powder diffractometry
chemical analysis
Resurrected Christ from Bodzentyn
investigations of historic-objects

Opis:

Powder diffraction techniques in studies of historical objects can be applied to the investigations of such substances as pigments, corrosion products of metals and other crystalline artistic materials. Unlike techniques such as X-ray fluorescence (XRF) and other methods of chemical analysis that provide information on elemental composition, XRPD enables the identification and differentiation of materials with similar or even identical chemical compositions. Shell and limestone, are chemically the same (calcium carbonate), but the atoms are arranged differently in each of them. It would be difficult to tell these materials apart using elemental analysis. Some techniques, however, such as X-ray diffraction (XRD), provide information on the way atoms are arranged in a given sample and thanks to this knowledge it is possible to detect which sample contain limestone an which contain shell. As other examples one can mention several pigments; e.g., two types of lead-tin yellow, Pb2SnO4 and PbSnO3 polymorphic modifications of TiO2, or different kinds of verdigris. Precise information on the substance used in an artwork is sometimes of great importance in the dating and authentication a work of art, and in studying the origin of historical materials and in characterization of the artist’s workshop. Moreover, a description of secondary changes in the phase composition enables the study of the signs and causes of damage produced by environmental conditions and is vital to the proper conservation of the object, whether through preventive measures or restorative treatment. X-ray diffraction analysis requires a very small sample (in micro-diffraction measurements, often much less than the size of a pinhead). Moreover an identification of the investigated materials can be performed with the use of already present reference powder diffraction data (PDF Files), which are prepared and distributed by the International Centre for Diffraction Data (Pennsylvania, USA). In this paper the results of the investigations of a green paint in the Gothic panel painting Resurrected Christ from Bodzentyn (Chrystus Zmartwychwstały z Bodzentyna are presented as an example of application of micro-diffraction analysis to study the pigments. Obtained results allowed identification of lead tin yellow type I (Pb2SnO4, PDF[24-0589]), hydrocerussite ((PbCO3)2Pb(OH)2, PDF[13-131]), malachite (Cu(OH)2CuCO3, PDF[56-0001]) and cynabar (HgS, PDF [42-1408]).

Źródło:

Opuscula Musealia; 2011, 19; 25-36
0239-9989
2084-3852

Pojawia się w:

Opuscula Musealia

Dostawca treści:

Biblioteka Nauki

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Skocz do pozycji: 38.

Tytuł:

Eneolithic copper jewellery from grave 7 of the Lublin-Volhynian culture at site 2 in Książnice, Świętokrzyskie Province, Poland. Typological and physical metallurgy characteristic
Eneolityczna biżuteria miedziana z grobu nr 7 kultury lubelsko-wołyńskiej na stanowisku 2 w Książnicach, woj. świętokrzystkie. Charakterystyka typologiczna i metalurgiczna

Autorzy:

Wilk, Stanisław
Garbacz-Klempka, Aldona

Powiązania:

https://bibliotekanauki.pl/articles/1396855.pdf

Data publikacji:

2016

Wydawca:

Uniwersytet Jagielloński. Instytut Archeologii

Tematy:

copper jewellery
metallurgy analysis
graves
Lublin-Volhynian culture
Lesser Poland
archaeometallurgy
X-ray fluorescence (XRF)

Opis:

This article presents a typological and physical metallurgy analysis of copper artifacts found in child grave (no 7) at the Lublin-Volhynian culture cemetery in Książnice (Lesser Poland). The burial, dating to approx. 4050–3940 BC, contains a rich set of copper jewellery: a massive earring, small earring, bracelet - made of copper wire, and two beads made of a rolled piece of metal sheet. As part of metallographic analysis of metal finds from grave 7, site 2 in Książnice, quantitative and qualitative analyses were conducted, regarding chemistry and microstructure of all the five artifacts. In the artifacts tested, there were identified the elements significant from the perspective of raw material origin and smelting technology: arsenic, antimony, silver, tin, zinc, lead, bismuth, cobalt, nickel and iron. The highest total content of impurities was noted for the bracelet. Against the background of other elements, the arsenic content stands out here and it is 2.1%, and lead 0.26%. For the remaining artifacts, the arsenic content was 0÷0,24%, and lead 0÷0,039%. Antimony (0.098%) and zinc (0.15%) was only recorded for the one of the bead. Also, the highest content of silver (0.05%) was established in this case. In the remaining ornaments, the silver content was below 0.02%. Based on the X-ray fluorescent spectroscopy results, chemical profiles were established for the individual, and they were ascribed to raw material groups according to R. Krause: 1) pure copper, 2) arsenic copper and 3) antimony copper (Krause 2003: 90–91, Abb. 40–41). The presented inventory of copper artifacts from grave 7, having many analogies in the Carpathian Basin and the areas to the north and east of the Carpathians, confirms the thesis about wide, trans-Carpathian contacts of the group which was using the necropolis in Książnice at the turn of 5th and 4th millennium BC.
Niniejszy artykuł prezentuje typologiczną i metaloznawczą analizę zabytków miedzianych znalezionych w grobie dziecięcym (nr 7) na cmentarzysku kultury lubelsko-wołyńskiej w Książnicach (Małopolska). Pochówek, datowany na przełom V i IV tysiąclecia BC (4050–3940 BC), zawierał bogaty zestaw biżuterii miedzianej, na który składały się: duża, masywna zausznica, mała zausznica i bransoleta – wykonane z drutu, oraz dwa paciorki ze zwiniętej blachy miedzianej. W ramach badań metaloznawczych, przeprowadzono ilościowe i jakościowe, analizy chemiczne i mikrostrukturalne wszystkich pięciu zabytków. W badanych zabytkach zidentyfikowano pierwiastki, istotne z punktu widzenia pochodzenia surowca i technologii wytopu. Należą do nich: arsen, antymon, srebro, cyna, cynk, ołów, bizmut, kobalt, nikiel i żelazo. Sumarycznie największą zawartość zanieczyszczeń zarejestrowano dla bransolety. Na tle innych pierwiastków wyróżnia się tu arsen, który wynosi 2,1% i ołów 0,26%. Dla pozostałych zabytków stężenie arsenu wynosiło 0÷0,24%, a ołowiu 0÷0,039%. Antymon (0,098%) i cynę (0,15%) zarejestrowano jedynie dla jednego z paciorków. W tym przypadku wykazano również najwyższą zawartość srebra (0,05%). W pozostałych ozdobach stężenie srebra wynosiło poniżej 0,02%. Na podstawie wyników analizy spektroskopii fluorescencji rentgenowskiej dokonano ustalenia profili chemicznych analizowanych zabytków oraz zaklasyfikowano je do grup surowcowych wg R. Krause: (1) miedzi czystej, (2) miedzi arsenowej oraz (3) miedzi antymonowej (Krause 2003: 90 – 91, ryc. 40 – 41). Zaprezentowany inwentarz zabytków miedzianych z grobu 7, mający liczne analogie w Kotlinie Karpackiej i na terenach położonych na północ i wschód od łuku Karpat, potwierdza tezę o szerokich transkarpackich kontaktach grupy użytkującej nekropolę w Książnicach na przełomie V i IV tysiąclecia BC.

Źródło:

Recherches Archéologiques Nouvelle Serie; 2016, 8; 29-46
0137-3285

Pojawia się w:

Recherches Archéologiques Nouvelle Serie

Dostawca treści:

Biblioteka Nauki

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Skocz do pozycji: 39.

Tytuł:

Technical note. The concept of a computer system for interpretation of tight rocks using X-ray computed tomography results

Autorzy:

Habrat, M.
Krakowska, P.
Puskarczyk, E.
Jędrychowski, M.
Madejski, P.

Powiązania:

https://bibliotekanauki.pl/articles/178712.pdf

Data publikacji:

2017

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

tight gas
shale gas
X-ray computed tomography
tight rocks
computer system for rock analysis

Opis:

The article presents the concept of a computer system for interpreting unconventional oil and gas deposits with the use of X-ray computed tomography results. The functional principles of the solution proposed are presented in the article. The main goal is to design a product which is a complex and useful tool in a form of a specialist computer software for qualitative and quantitative interpretation of images obtained from X-ray computed tomography. It is devoted to the issues of prospecting and identification of unconventional hydrocarbon deposits. The article focuses on the idea of X-ray computed tomography use as a basis for the analysis of tight rocks, considering especially functional principles of the system, which will be developed by the authors. The functional principles include the issues of graphical visualization of rock structure, qualitative and quantitative interpretation of model for visualizing rock samples, interpretation and a description of the parameters within realizing the module of quantitative interpretation.

Źródło:

Studia Geotechnica et Mechanica; 2017, 39, 1; 101-107
0137-6365
2083-831X

Pojawia się w:

Studia Geotechnica et Mechanica

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 40.

Tytuł:

Dendrimeric peptide – montmorillonite intercalation compound
Montmorylonit interkalowany dendrymerami peptydowymi

Autorzy:

Kędzierski, M.
Janiszewska, J.
Moszumańska, I.

Powiązania:

https://bibliotekanauki.pl/articles/945857.pdf

Data publikacji:

2016

Wydawca:

Sieć Badawcza Łukasiewicz - Instytut Chemii Przemysłowej

Tematy:

dendrimeric peptides
montmorillonite
intercalation
X-ray diffraction
BET analysis
dendrymery peptydowe
montmorylonit
interkalacja
dyfrakcja rentgenowska
analiza BET

Opis:

The solution intercalation method was used for immobilization of low-molecular-mass lysine--based peptide dendrimers (Lys-D, hydrochloride form) on montmorillonite (MMT). The intercalation was confirmed by X-ray diffraction and elemental analysis of the products. Analysis of Brunauer-Emmett-Teller (BET) nitrogen adsorption–desorption isotherms indicates that both interlayer and external clay surfaces are involved in the binding of dendrimeric peptides. Depending on the structure of Lys-D, including the location of protonated amino groups in peptide branches, the intercalation involves ion exchange between sodium montmorillonite and peptide ionic groups or proceeds leaving the intact peptide counterions. Thermogravimetric analysis (TGA) studies of MMT-Lys-D compounds indicate that the major mass-loss associated with the decomposition of peptide component is shifted to higher temperatures compared to the peptide itself.
Metodą interkalacji z roztworu przeprowadzono immobilizację niskocząsteczkowych dendrymerów L-lizyny (Lys-D, w formie chlorowodorku) na montmorylonicie (MMT). Wyniki analizy metodą dyfrakcji rentgenowskiej (XRD) oraz analizy elementarnej (C, H, N, Cl) potwierdziły interkalację peptydu w MMT. Na podstawie analizy izoterm adsorpcji–desorpcji azotu Brunauera-Emmetta-Tellera (BET) stwierdzono, że związanie peptydu następuje zarówno w przestrzeni międzywarstwowej, jak i na zewnętrznej powierzchni MMT. W zależności od struktury peptydu Lys-D i położenia protonowanych grup aminowych interkalacja połączona jest z wymianą jonową pomiędzy montmorylonitem sodowym i peptydem lub przebiega z zachowaniem wyjściowych przeciwjonów chlorkowych Lys-D. Analiza TGA związków MMT-Lys-D wskazuje, że główny ubytek masy związany z rozkładem składnika peptydowego zachodzi w wyższym zakresie temperatury niż w przypadku peptydu niezwiązanego.

Źródło:

Polimery; 2016, 61, 10; 677-682
0032-2725

Pojawia się w:

Polimery

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 41.

Tytuł:

Analysis of Thermal Stability of Intermetallic Phases Precipitates in Continuous Ingots of AlCu4MgSi Alloy

Autorzy:

Nuckowski, P. M.
Kondracki, M.
Wróbel, T.

Powiązania:

https://bibliotekanauki.pl/articles/382300.pdf

Data publikacji:

2019

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

aluminium alloys
phase analysis
high temperature X-ray diffraction
thermal-derivative analysis
stopy aluminium
analiza fazowa
wysokotemperaturowa dyfrakcja rentgenowska
analiza termopochodna

Opis:

The article presents the results of research concerning to AlCu4MgSi alloy ingots produced using horizontal continuous casting process. The presented research was focused on the precise determination of phase composition of the precipitates formed during the solidification of ingots and the analysis of their thermal stability. In order to assess the morphology of precipitates in the AlCu4MgSi alloy, data obtained by using a computer simulation of thermodynamic phenomena were compiled with results obtained using advanced research techniques, i.e. High-temperature X-ray diffraction (HT-XRD), SEM-EDS, Thermal and derivative analysis (TDA) and Glow discharge optical emission spectroscopy (GD OES). SEM observations and analysis of chemical composition in micro-areas showed that the precipitates are mainly intermetallic θ-Al2Cu and β-Mg2Si phases, and also presence of Al19Fe4MnSi2 intermetallic phase was confirmed by X-ray diffraction studies. Based on the prepared Thermo-Calc simulation data, high-temperature X-ray diffraction measurements were conducted.

Źródło:

Archives of Foundry Engineering; 2019, 4; 99-104
1897-3310
2299-2944

Pojawia się w:

Archives of Foundry Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 42.

Tytuł:

Study on the State of Internal Stress and Strain of TATB-based Polymer Bonded Explosive Using Strain Markers and Cone-Beam Computed Tomography

Autorzy:

Dai, B.
Lan, L.-G.
Zhang, W.-B.
Tian, Y.

Powiązania:

https://bibliotekanauki.pl/articles/358613.pdf

Data publikacji:

2017

Wydawca:

Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego

Tematy:

technology of materials
testing and analysis
compression molding
polymer bonded explosive
stress state
strain ellipsoid
X-ray tomography

Opis:

Precise measurement of the inner structural strain of polymer bonded explosive (PBXs) granules during compression molding is highly desirable in order to investigate the inner stress distribution field and its underlying generation mechanism, with the aim of improving the stress distribution uniformity. In this contribution, TATB-based (1,3,5-triamino-2,4,6-trinitrobenzene) PBX granules were formulated and the stress-strain state of the PBX granules during the warm molding process was analyzed. Strain markers were implanted at different locations and the deformation characteristics and regularity of the embedded spherical strain markers were obtained by X-ray micro-tomography. Thus the local strain states at different locations could be obtained, and the local stress state could be deduced. The results showed that axisymmetric deformation occurred in all of the strain markers, where the flat strain ellipsoids were mainly compressed uni-axially. In the central region, the stress was mainly in an axial direction, and the shear force was small. Not only axial stresses, but also large shear stresses in the surrounding region of the cylindrical grains were present. The stress gradient in the central region was greater than that in the surrounding region. The stress was greater in the surrounding region because this region was squeezed by the mold. The maximum strain degree was 44.8% larger than the minimum strain degree. The local stress increment in each region was quantified. The stress increments of the three axes were in the range 14.2-19.5 MPa. This study examined the feasibility of evaluating the inner stress–strain state of PBX granules in a quantitative manner, which is significant in determining the inner strain and stress distribution in PBX granules during the molding process.

Źródło:

Central European Journal of Energetic Materials; 2017, 14, 3; 688-707
1733-7178

Pojawia się w:

Central European Journal of Energetic Materials

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 43.

Tytuł:

Fabrication and Crystal Structure of Sol-Gel Deposited BST thin Films with Compositional Gradient

Autorzy:

Czekaj, D.
Lisińska-Czekaj, A.
Plewa, J.

Powiązania:

https://bibliotekanauki.pl/articles/356193.pdf

Data publikacji:

2017

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

Ba1-xSrxTiO3 thin films
compositionally graded structure
sol-gel method
simultaneous thermal analysis
X-ray diffraction

Opis:

In the present research technology of compositionally graded barium strontium titanate Ba_1-xSr_xTiO₃ thin films deposited on stainless steel substrates by sol-gel spin coating followed with thermal annealing at T = 650°C is reported. Results of thermal behavior of the sol-gel derived powders with compositions used for fabrication of graded structure (i.e. with Sr mole fraction x =0.5, 0.4 and 0.3) are described. X-ray diffraction studies of the phase composition and crystal structure of such complex thin film configuration are given. It was found that gel powders exhibited a large total weight loss of about Δm ≈ 44-47%. Three stages of weight loss took place at temperature ranges: below T ≈ 300°C, at ΔT ≈ 300-500°C and between T = 600°C and T = 800°C. Phase analysis has shown that the dominating phase is Ba_0.67Sr_0.33TiO₃ compound while the second phase is Ba_0.7Sr_0.3TiO₃ or Ba_0.5Sr_0.5TiO₃ for “up-graded” and “down-graded” structure, respectively.

Źródło:

Archives of Metallurgy and Materials; 2017, 62, 2A; 673-678
1733-3490

Pojawia się w:

Archives of Metallurgy and Materials

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 44.

Tytuł:

Ausferritic Microstructure Phase Analysis in Ductile Iron

Autorzy:

Trzaskowski, W.
Nawrocki, P.
Łukasik, K.
Myszka, D.

Powiązania:

https://bibliotekanauki.pl/articles/381436.pdf

Data publikacji:

2018

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

image analysis
ausferritic ductile iron
x-ray diffraction
austenite
ferrite
analiza obrazu
żeliwo sferoidalne
dyfrakcja rentgenowska
austenit
ferryt

Opis:

Image analysis allows to acquire a number of valuable quantitative informations on the observed structure and make appropriate conclusions. So far, a large part of analyzed images came only from light microscopes, where it was a possibility of accurately distinguish the different phases on the plane. However, the problem happened in the case of the observation of images obtained by scanning electron microscopy. In this case, the presence of various shades of gray, and the spaciousness of the image attained. To perform the analysis the matrix images of the ausferritic ductile iron were used. Full analysis was carried out using the computer program MicroMeter 1.03. Results obtained in the analysis were related directly to the results from X-ray diffraction. Obtained as a result of the analysis were related directly to the results from X-ray diffractometer. The following technique has weaknesses, including the misinterpretation by the operator microscope or program. After all, it was possible to obtain similar results to the result that has been obtained from X-ray diffractometer.

Źródło:

Archives of Foundry Engineering; 2018, 18, 2; 112-116
1897-3310
2299-2944

Pojawia się w:

Archives of Foundry Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 45.

Tytuł:

Source apportionment of the PM10 fraction of particulate matter collected in Kraków, Poland

Autorzy:

Samek, L.

Powiązania:

https://bibliotekanauki.pl/articles/146888.pdf

Data publikacji:

2012

Wydawca:

Instytut Chemii i Techniki Jądrowej

Tematy:

air pollution
energy dispersive X-ray fluorescence (EDXRF)
elemental concentration
particulate matter
statistical analyses
PCA - principal component factor analysis
MLRA - multilinear regression analysis

Opis:

Samples of PM10 fraction of air particulates were collected during the winter of 2010 at two different sites in the City of Kraków, Poland. One site was located nearby a steel mill (Nowa Huta district) and the second one was situated at a distance of 10 km from the first site (Krowodrza district). The measured mass concentrations of PM10 fraction were in the range of 33 to 358 μg/m3. They exceeded the permissible daily limit value of 50 μg/m3. The Voivodship Inspectorate for Environmental Protection in Kraków was in charge of collecting samples as well as determining mass concentrations. Assessment of elemental concentrations and statistical analyses were performed at the University of Science and Technology in Kraków. Mean concentrations of Ti, Cu, Br and Pb were almost the same at both sites, while those of K, Ca and Zn were two times higher at Nowa Huta than at Krowodrza. Cr, Mn and Fe mass concentrations were also higher at Nowa Huta site; the values were a factor of three higher for Cr and Mn and factor of four for Fe. Factor analysis (FA) and multilinear regression analysis (MLRA) were used to determine source contributions to ambient PM10. The measurements were based on PM10 composition data which included elemental concentrations. Local combustion, industry and other, not identified sources, such as secondary aerosols, were the factors that highly contributed to the pollution of PM10 during winter time. For the site at Nowa Huta 53.1% of pollution was attributable to combustion and traffic, 28.5% was due to industry and wood combustion, and 18.3% were not identified. For the Krowodrza site, industry and wood combustion contributed 46.1%, combustion and traffic 50.4% and other, not identified sources 3.5% of the total PM10. Examination of meteorological data suggested that the concentration of potassium was inversely proportional to ambient air temperature at both sites. A wood combustion was identified as possible source of potassium in PM10.

Źródło:

Nukleonika; 2012, 57, 4; 601-606
0029-5922
1508-5791

Pojawia się w:

Nukleonika

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 46.

Tytuł:

The Influence of Variable Parameters of Horizontal Continuous Casting on the Structure of AlCu4MgSi Alloy Ingots

Autorzy:

Nuckowski, P. M.
Wróbel, T.

Powiązania:

https://bibliotekanauki.pl/articles/380484.pdf

Data publikacji:

2018

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

metallography
aluminum alloys
continuous casting
structure analysis
X-ray diffraction
phase analysis
metalografia
stopy aluminium
odlewanie ciągłe
analiza struktury
dyfrakcja rentgenowska
analiza fazy

Opis:

The article presents results of research on the influence of variable parameters of horizontal continuous casting on the structure of AlCu4MgSi (EN AW-2017A) alloy ingots. The special character of the process allows for a continuous change of some of its parameters, namely, of the casting speed and of the rate of the cooling fluid flow thorough the crystallizer. These parameters have a significant impact on the crystallization process of the liquid metal. Depending on the cooling rate, intensity of the convection inside the solidifying alloy, and its chemical composition, there may arise some differences in the structure of the cast. In this study, ingots obtained at different casting speeds have been analyzed. The research methodology, based on light microscopy and electron microscopy (SEM), as well as energy dispersive spectroscopy (EDS) and X-ray diffraction (XRD), allowed for a thorough examination of the structure of the studied materials. The results were shown that an increase in the ingot casting speed leads to an increase in the average grain surface area.

Źródło:

Archives of Foundry Engineering; 2018, 18, 1; 196-202
1897-3310
2299-2944

Pojawia się w:

Archives of Foundry Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 47.

Tytuł:

Kalibracja wyników analiz chemicznych piaskowców czerwonego spągowca wykonanych przenośnym spektrometrem XRF
Calibration of the results of Rotliegend sandstones chemical analyses performed with a handheld XRF spectrometer

Autorzy:

Skupio, Rafał
Zagórska, Urszula
Kowalska, Sylwia

Powiązania:

https://bibliotekanauki.pl/articles/1834126.pdf

Data publikacji:

2020

Wydawca:

Instytut Nafty i Gazu - Państwowy Instytut Badawczy

Tematy:

fluorescencja rentgenowska
spektrometria XRF
kalibracja
skład pierwiastkowy
analiza skał
X-ray fluorescence
XRF spectrometry
calibration
elemental composition
rock analysis

Opis:

Handheld X-ray fluorescence spectrometers with energy dispersion (EDXRF) are increasingly used to determine the chemical composition of rocks for the oil and gas industry. The results of our research allow to create or support the lithological interpretation based on mineralogical models. In the case of quantitative interpretation based on the results of measurements using a handheld XRF device, high accuracy of measurements is required. This paper presents the problems to which attention should be paid when applying the assumed methodology, mainly related to the underestimated percentages for light (main) elements. The tests were carried out on powdered samples of drill cores taken from borehole directed to Rotliegend rocks. The measurements were carried out using Bruker’s XRF S1 TITAN spectrometer. The calibration and correction tests led to the elimination of two factors affecting the inaccuracy of the analyses. The first is the progressive aging of the X-ray tube, which should be checked by conducting systematic measurements of the standard reference material. The second concerns the effect of a change in the density of the sample after grinding, which has a significant impact on light elements (mainly silicon and aluminium), causing a decrease in absolute values in the results of measurements using a handheld XRF device. Due to the type of rock material analysed, the focus was on the calibration of the results of the main elements building the Rotliegend sandstone rock matrix. The paper presents the possibility of calibrating the results directly in the device, which results in obtaining calibrated results after each measurement, as well as calibration of results in an external file. By using external calibration, errors caused by changing the rock matrix can be avoided while ensuring that possibility the results can be recalculated. The resulting calibration coefficients are applicable to the Rotliegend rocks and the XRF spectrometer with current software and GeoChem calibrations provided by Bruker. A change in any of the factors requires re-testing and recalibration of the results. Mineralogical models prepared based on XRF analyses can be used in the future, if those appropriate calibration coefficients are used.

Źródło:

Nafta-Gaz; 2020, 76, 1; 12-17
0867-8871

Pojawia się w:

Nafta-Gaz

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 48.

Tytuł:

The complementary structural studies of the double metal cyanide type catalysts for the ring opening polymerization of the oxiranes
Komplementarne badania strukturalne dimetalocyjankowych katalizatorów polimeryzacji z otwarciem pierścienia oksiranowego

Autorzy:

Chruściel, A.
Hreczuch, W.
Czaja, K.
Ławniczak-Jabłońska, K.
Janik, J.

Powiązania:

https://bibliotekanauki.pl/articles/947469.pdf

Data publikacji:

2016

Wydawca:

Sieć Badawcza Łukasiewicz - Instytut Chemii Przemysłowej

Tematy:

double metal cyanide catalysts (DMC)
thermal analysis
thermogravimetric analysis (TG)
differential scanning calorimetry (DSC)
evolved gas analysis (EGA)
X-ray absorption spectroscopy (XAS)
X-ray absorption near edge structure (XANES)
extended X-ray absorption fine structure (EXAFS)
katalizatory dimetalocyjankowe (DMC)
analiza termiczna
analiza termograwimetryczna (TGA)
różnicowa kalorymetria skaningowa (DSC)
analiza wydzielanych gazów (EGA)
rentgenowska absorpcyjna spektroskopia struktury przykrawędziowej (XANES)
synchrotronowa absorpcyjna spektroskopia rentgenowska (EXAFS)

Opis:

The extensive complementary experimental studies of the double metal catalysts (DMC) with two kinds of the organic ligands were performed. The chemical justification of the observed TG/DSC (thermogravimetric analysis/differential scanning calorimetry) steps was proposed. Several organic ligand complexing states were found in both types of catalysts. X-ray absorption spectroscopy (XAS) analysis established that only Zn atoms are the active metallic centers in DMC catalyst regardless the used ligand. Cl atoms were detected near some of Zn atoms. Contrary to the common suppositions no significant amount of oxygen atoms was detected in the closest coordination spheres of Zn.
Przeprowadzono badania strukturalne katalizatorów dimetalocyjankowych (DMC) z dwoma rodzajami ligandów organicznych. Zaproponowano wyjaśnienie etapów przebiegu krzywych otrzymanych metodą analizy termograwimetrycznej i różnicowej kalorymetrii skaningowej (TG/DSC) badanych katalizatorów. Wykazano obecność kilku stopni związania ligandów w kompleksach DMC. Na podstawie wyników badań z wykorzystaniem absorpcji rentgenowskiej (XAS) stwierdzono, że centrum aktywne katalizatora stanowi atom cynku. W bezpośrednim sąsiedztwie atomów Zn wykryto obecność atomów Cl, natomiast w najbliższych sferach koordynacyjnych atomu Zn nie wykryto atomów tlenu.

Źródło:

Polimery; 2016, 61, 6; 421-432
0032-2725

Pojawia się w:

Polimery

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 49.

Tytuł:

Preparation, characterization and optimization of cross-linked fructosyltransferase aggregates for the production of prebiotic fructooligosaccharides

Autorzy:

Ademakinwa, A.N.
Ayinla, Z.A.
Omitogun, O.G.
Agboola, F.K.

Powiązania:

https://bibliotekanauki.pl/articles/81247.pdf

Data publikacji:

2018

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

fructosyltransferase
Aureobasidium pullulans
fructooligosaccharide
prebiotic
statistical optimization
scanning electron microscopy
X-ray spectroscopy
Fourier transform infrared spectroscopy
biotransformation
chemometric analysis

Źródło:

BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology; 2018, 99, 4
0860-7796

Pojawia się w:

BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 50.

Tytuł:

Wykorzystanie rentgenowskiej mikrotomografii komputerowej i cyfrowej analizy obrazu do petrologicznej charakterystyki skał węglanowych
X-ray microtomography and digital image analysis application to a petrological characterization of carbonates

Autorzy:

Strzelecki, Piotr Jan
Fheed, Adam
Radzik, Natalia
Świerczewska, Anna

Powiązania:

https://bibliotekanauki.pl/articles/2075973.pdf

Data publikacji:

2019

Wydawca:

Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy

Tematy:

rentgenowska mikrotomografia komputerowa
cyfrowa analiza obrazu
geometria porowa
skały węglanowe
X-ray microcomputed tomography
digital image analysis
porosity geometry
carbonates

Opis:

The paper briefly describes a possible application of X-ray computed microtomography studies followed by digital image analysis, enabling petrological assessment of carbonate rocks. The contribution presents an example of a complex, qualitative and quantitative approach aiming at deriving shape, geometry and spatial orientation of rock components as applied for a carbonate reservoir rock sample from the Zechstein Limestone (Ca1) strata. Apart from the basic properties of the analyzed objects, such as volume, surface area and number, detailed shape descriptors were obtained (compactness, sphericity, elongation, flatness, spareness). The presented approach allows for obtaining detailed 3D results at the microscopic scale, enabling extensive characterization of the studied material geometry. The methods proposed could be applied for other rock types as well.

Źródło:

Przegląd Geologiczny; 2019, 67; 195--197
0033-2151

Pojawia się w:

Przegląd Geologiczny

Dostawca treści:

Biblioteka Nauki

/5

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