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Tytuł:
Structural properties of Mn-substituted hercynite
Autorzy:
Jastrzębska, I.
Bodnar, W.
Witte, K.
Burkel, E.
Stoch, P.
Szczerba, J.
Powiązania:
https://bibliotekanauki.pl/articles/147826.pdf
Data publikacji:
2017
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
FeAl2O4
MnAl2O4
hercynite
spinel
galaxite
Mössbauer spectroscopy
Opis:
In this work spinel series with the general formula Fe1–xMnxAl2O4 (where x = 0, 0.3, 0.5 and 0.7) were synthesized and characterized with respect to their structure and microstructure. X-ray diffractometry (XRD) was used to identify the phase composition that revealed a single phase spinel material. Rietveld refinements of the XRD patterns were carried out in order to determine the lattice and oxygen positional parameters of the spinel compounds. Mössbauer effect measurements were performed at room temperature to determine the local chemical environment of the Fe ions, their valences, and degrees of spinels inversion. It was shown that an increase in the Mn content led to a decrease in the ratio of Fe2+ to Fe3+. The results obtained from Mössbauer spectroscopy (MS) were used to establish the chemical formulas of the synthesized spinels. Finally, the microstructure that was observed using scanning electron microscopy (SEM) showed a compact microstructure with an octahedral crystal habit.
Źródło:
Nukleonika; 2017, 62, 2; 95-100
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Structural Properties of MnTe, ZnTe, and ZnMnTe
Autorzy:
Gonzalez Szwacki, N.
Przeździecka, E.
Dynowska, E.
Bogusławski, P.
Kossut, J.
Powiązania:
https://bibliotekanauki.pl/articles/2038244.pdf
Data publikacji:
2004-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.50.Ah
75.50.Pp
61.10.-i
Opis:
Structural properties of ZnTe, MnTe, and Mn$\text{}_{1-x}$Zn$\text{}_{x}$Te alloy with zinc-blende, NiAs, and wurtzite phases were investigated by ab initio calculations. The calculated structural properties are in good agreement with the available experimental data. Theory predicts that the zinc-blende phase is more stable than wurtzite for all compositions. Mn$\text{}_{1-x}$Zn$\text{}_{x}$Te samples with 0.01 < x < 0.20 were grown by MBE. X-ray analysis of their crystalline structure revealed the presence of zinc-blende, wurtzite, and NiAs phases. The dominant phase changes from NiAs for the sample with x=0.01 to wurtzite for x=0.20. The observed stabilization of the wurtzite phase is possibly due to the hexagonal structure of the MnTe buffer.
Źródło:
Acta Physica Polonica A; 2004, 106, 2; 233-238
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Some structural properties of plant serine:glyoxylate aminotransferase?
Autorzy:
Truszkiewicz, Wiesław
Paszkowski, Andrzej
Powiązania:
https://bibliotekanauki.pl/articles/1041442.pdf
Data publikacji:
2005
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
structural properties
peroxisomes
wheat
photorespiration
serine : glyoxylate aminotransferase
maize
Opis:
The structural properties of photorespiratory serine:glyoxylate aminotransferases (SGAT, EC 2.6.1.45) from maize (Zea mays L.) and wheat (Triticum aestivum L.) leaves were examined. By means of molecular sieving on Zorbax SE-250 column and filtration through centrifugal filters it was shown that dimers of wheat enzyme (molecular mass of about 90 kDa) dissociate into component monomers (molecular mass of about 45 kDa) upon decrease in pH value (from 9.1 or 7.0 to 6.5). At pH 9.1 a 50-fold decrease of ionic strength elicited a similar effect. Under the same conditions homodimers of the maize enzyme (molecular mass similar to that of the wheat enzyme) remained stable. Immunoblot analysis with polyclonal antiserum against wheat seedling SGAT on leaf homogenates or highly purified preparations of both enzymes showed that the immunogenic portions of the wheat enzyme are divergent from those of the maize enzyme. The sequence of 136 amino acids of the maize enzyme and 78 amino acids of the wheat enzyme was established by tandem mass spectrometry with time of flight analyzer. The two enzymes likely share similarity in tertiary and quaternary structures as well as high level of hydrophobicity on their molecular surfaces. They likely differ in the mechanism of transport from the site of biosynthesis to peroxisomes as well as in some aspects of secondary structure.
Źródło:
Acta Biochimica Polonica; 2005, 52, 2; 527-534
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Assessment of selected structural properties of orthodontic arches
Autorzy:
Zięty, A.
Grygier, D.
Detyna, J.
Sarul, M.
Powiązania:
https://bibliotekanauki.pl/articles/284614.pdf
Data publikacji:
2018
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
Tematy:
orthodontic arches
biocompatibility
nickel
Źródło:
Engineering of Biomaterials; 2018, 21, 148; 47
1429-7248
Pojawia się w:
Engineering of Biomaterials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Strength and structural properties of structural timber
Właściwości strukturalno-wytrzymałościowe drewna konstrukcyjnego
Autorzy:
Rudziński, L.
Wdowiak, A.
Powiązania:
https://bibliotekanauki.pl/articles/402209.pdf
Data publikacji:
2016
Wydawca:
Politechnika Świętokrzyska w Kielcach. Wydawnictwo PŚw
Tematy:
timber
macroscopic and microscopic structure
physical and mechanical properties
moisture
Poland's nature and forest lands
fresh and dried sawn timber
artificial drying
sorting in terms of strength
drewno
struktura makroskopowa i mikroskopowa
właściwości fizyczne i mechaniczne
wilgotność
przyrodniczo-leśne tereny Polski
świeża i suszona tarcica
suszenie sztuczne
sortowanie pod względem wytrzymałości
Opis:
Taking into account the growing significance of structural timber in the building industry, the paper aims at defining the selected mechanical and physical properties of the Polish pine structural sawn timber from four nature and forest lands: Land A – Mazovian-Podlasian Nature and Forest Land (Forest District Garwolin), Land B – Little Poland Nature and Forest Land (Forest District Przedbórz), Land C – Silesian Nature and Forest Land (Forest District Kedzierzyn Koźle), Land D – Carpathian Nature and Forest Land (Forest District Piwniczna) [4]. The paper presents the definition of timber, its macroscopic and microscopic structure as well as factors affecting the mechanical properties of timber such as moisture or structural defects. The conducted tests involved sorting sawn timber in terms of strength using visual method according to the PN-D-94021 standard as well as characterizing the average moisture of the fresh and artificially dried sortment [6-8].
Źródło:
Structure and Environment; 2016, 8, 2; 103-108
2081-1500
Pojawia się w:
Structure and Environment
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Structural Properties of Recursively Partitionable Graphs with Connectivity 2
Autorzy:
Baudon, Olivier
Bensmail, Julien
Foucaud, Florent
Pilśniak, Monika
Powiązania:
https://bibliotekanauki.pl/articles/31342171.pdf
Data publikacji:
2017-02-01
Wydawca:
Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
Tematy:
online arbitrarily partitionable graph
recursively arbitrarily partitionable graph
graph with connectivity 2
balloon graph
Opis:
A connected graph G is said to be arbitrarily partitionable (AP for short) if for every partition (n1, . . ., np) of |V (G)| there exists a partition (V1, . . ., Vp) of V (G) such that each Vi induces a connected subgraph of G on ni vertices. Some stronger versions of this property were introduced, namely the ones of being online arbitrarily partitionable and recursively arbitrarily partitionable (OL-AP and R-AP for short, respectively), in which the subgraphs induced by a partition of G must not only be connected but also fulfil additional conditions. In this paper, we point out some structural properties of OL-AP and R-AP graphs with connectivity 2. In particular, we show that deleting a cut pair of these graphs results in a graph with a bounded number of components, some of whom have a small number of vertices. We obtain these results by studying a simple class of 2-connected graphs called balloons.
Źródło:
Discussiones Mathematicae Graph Theory; 2017, 37, 1; 89-115
2083-5892
Pojawia się w:
Discussiones Mathematicae Graph Theory
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Test signal generation for service diagnosis based on local structural properties
Autorzy:
Ungermann, M.
Lunze, J.
Schwarzmann, D.
Powiązania:
https://bibliotekanauki.pl/articles/331378.pdf
Data publikacji:
2012
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
analiza strukturalna
generowanie sygnału
właściwości strukturalne
structural analysis
service diagnosis
active diagnosis
test generation
Opis:
The paper presents a new approach to the generation of test signals used in service diagnosis. The tests make it possible to isolate faults, which are isolable only if the system is brought into specific operating points. The basis for the test signal selection is a structure graph that represents the couplings among the external and internal signals of the system and the fault signals. Graph-theoretic methods are used to identify edges that disappear under certain operating conditions and prevent a fault from changing the system behavior at this operating point. These operating conditions are identified by validuals, which are indicators obtained during the graph-theoretic analysis. The test generation method is illustrated by a process engineering example.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2012, 22, 1; 55-65
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of Uniaxial Stretching on Structural Properties of Poly(3-Alkylthiophenes)
Autorzy:
Łużny, W.
Zagórska, M.
Powiązania:
https://bibliotekanauki.pl/articles/1964842.pdf
Data publikacji:
1997-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
36.20.-r
61.10.-i
Opis:
The influence of uniaxial stretching on the molecular structure of poly(3-alkylthiophenes) was studied with the use of X-ray diffraction. Three poly(3-alkylthiophenes), namely these containing n-hexyl, n-octyl and n-decyl groups, were investigated. The samples were oriented by stretching and the diffraction patterns for two geometries of scattering were obtained for undoped samples. The comparison of experimental diffraction data for unoriented and oriented samples, gives information about the role of the side chains in the changes of molecular conformation induced by stretching of the polymer sample. The main conclusion of our work is that the process of orientation induces similar phenomena in all samples studied, but the structural and conformation changes depend on the side chain length: the shorter the alkyl substituent, the easier the straightening of the main polymer chain. The authors suggest that uniaxial stretching of poly(3-alkylthiophenes) changes the degree of main chain planarity. This effect can influence the π-conjugation in polymer system, which may have great importance for any future application of poly(3-alkylthiophenes).
Źródło:
Acta Physica Polonica A; 1997, 92, 3; 491-500
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of management of a volcanic ash soil on structural properties
Autorzy:
Ellies, A.
Horn, R.
Smith, R.
Powiązania:
https://bibliotekanauki.pl/articles/26609.pdf
Data publikacji:
2000
Wydawca:
Polska Akademia Nauk. Instytut Agrofizyki PAN
Tematy:
soil
volcanic ash soil
soil management
structural property
Źródło:
International Agrophysics; 2000, 14, 4
0236-8722
Pojawia się w:
International Agrophysics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mechanical and structural properties of poly(phenylethylene) systems: a preliminary study
Autorzy:
Farrugia, Zachary
Grima, Joseph N.
Powiązania:
https://bibliotekanauki.pl/articles/1955222.pdf
Data publikacji:
2019
Wydawca:
Politechnika Gdańska
Tematy:
auxetics
negative Poisson ratio
organic networked polymers
Opis:
The structural and mechanical properties of various types of poly(phenylacetylene) crystalline networked polymers which stack in the third direction in a graphite-like manner have been the subject of extensive research over the past few years. These studies have suggested that depending on the particular manner of substitution of the phenyls, it is possible to achieve some very interesting mechanical properties, which include, in some cases, negative Poisson's ratio (NPR) andór negative linear compressibility (NLC). The current study investigated how alternatives to these systems can be designed, and specifically tailor-made to exhibit desirable anomalous properties, such as NPR and NLC, through the replacement of the acetylene chains with ethylene chains, so as to produce the poly(phenylethylene) equivalents. Using force field-based simulations, via the use of the polymer consistent force-field (PCFF) it was noted that, to a first approximation, these systems mirror some of the analogous properties exhibited by their poly(phenylacetylene) counterparts. In particular, poly(phenylethylene) systems built from 1234- and 1245-substituted phenyls exhibited negative Poisson's ratios, with the latter also exhibiting negative linear compressibility. This anomalous behaviour, mirrors, to some extent, that exhibited by their poly(phenylacetylene) counterparts, albeit some differences were noted, such as a reduction in the degrees of auxeticity. It was also noted that the poly(phenylethylene) systems modelled here tend to stack in the third direction, in a different manner than their poly(phenylacetylene) analogues, which difference is likely to be the factor for such reduction in auxeticity.
Źródło:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2019, 23, 3; 269-301
1428-6394
Pojawia się w:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mechanical and Structural Properties of High Purity Al Processed by ECAP
Autorzy:
Kvačkaj, T.
Kočiško, R.
Pokorný, I.
Bidulská, J.
Kvačkaj, M.
Kováčová, A.
Bidulský, R.
Lityńska-Dobrzyńska, L.
Dutkiewicz, J.
Powiązania:
https://bibliotekanauki.pl/articles/1418957.pdf
Data publikacji:
2012-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.05.Bx
81.07.-b
81.20.Hy
81.40.-z
Opis:
The mechanical properties and substructure formation of high purity aluminium (99.999%) processed by severe plastic deformation method (equal channel angular pressing) were studied. The equal channel angular pressing process was carried out at room temperature by route C (sample rotation around the axis about 180° after each pass) in a die with two channels intersecting at an angle of Φp = 90. The softening mechanism through dynamic recovery was recognized up to 6th equal channel angular pressing pass, however, after that the mechanical strengthening was revealed. The samples after equal channel angular pressing processing were annealed in different temperature and time conditions. The influence of annealing temperature and time on microhardness as well as diameter of grain size were investigated in samples processed by the 4th equal channel angular pressing pass.
Źródło:
Acta Physica Polonica A; 2012, 122, 3; 557-560
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Correlation between Optical and Structural Properties of Chemically deposited CdS Thin Films
Autorzy:
Mohammed, R. Y.
Abduol, S.
Mousa, A. M.
Powiązania:
https://bibliotekanauki.pl/articles/411521.pdf
Data publikacji:
2014
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
cadmium sulfide
chemical bath deposition
CdS films
XRD
Opis:
Polycrystalline Cadmium sulfide (CdS) films were deposited onto Corning glass substrates from alkaline solutions containing CdCl2, KOH, Na3C6H5O7 and CS(NH2)2 at different deposition times (10, 20, 30, 40 and 50 min), different bath temperatures and different concentration of the reactants. A comparative study was performed out on thin film via optical transmission and X-ray diffraction (XRD) measurements which reveal that the deposition time has a profound influence on the growth rate and band gap of the deposited layers. Diffraction data are used to evaluate the lattice parameter, grain size, average strain, number of crystallites per unit area and dislocation density in the film are calculated.
Źródło:
International Letters of Chemistry, Physics and Astronomy; 2014, 11, 2; 146-158
2299-3843
Pojawia się w:
International Letters of Chemistry, Physics and Astronomy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Structural Properties of Some Alkali Metal Hydrides at High Temperature and Pressure
Autorzy:
Thakre, V.
Singh, S.
Powiązania:
https://bibliotekanauki.pl/articles/1030544.pdf
Data publikacji:
2018-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
hydrides
phase transition
three-body interaction
volume collapse
elastic constants
cohesive energy
Opis:
In this paper we have developed a realistic interaction potential model to study the high pressure phase transition of ionic alkali-metal compounds KH and NaH, having B₁ structure at room temperature. We have theoretically investigated phase transition pressures and volume collapses of KH and NaH at high temperatures, and found results well suited with available experimental data. The elastic constants and their pressure derivatives are reported first time. The thermodynamical properties of B₁ phase of KH and NaH are also predicted. The inclusion of temperature effect in TBIP makes the present model realistic and suitable for theoretical high-pressure studies.
Źródło:
Acta Physica Polonica A; 2018, 133, 1; 186-193
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 415

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