Skocz do pozycji: 1.

Tytuł:

A comparative study on the performance of radiation detectors from the HgI2 crystals grown by different techniques

Autorzy:

Martins, J. F. T.
Costa, F. E.
dos Santos, R. A.
de Mesquita, C. H.
Hamada, M. M.

Powiązania:

https://bibliotekanauki.pl/articles/146916.pdf

Data publikacji:

2012

Wydawca:

Instytut Chemii i Techniki Jądrowej

Tematy:

crystal growth
iodide mercury crystal
physical vapor transport (PVT)
radiation detector
semiconductor crystal

Opis:

In this work, the establishment of a technology for HgI2 purification and crystal growth is described, aiming at a future application of this crystal as a room temperature radiation semiconductor detector. Two methods of crystal growth were studied in the development of this work: (1) physical vapor transport (PVT) and (2) saturated solution from dimethylsulphoxide (DMSO) complexes. In order to evaluate the crystals obtained using each of these methods, systematic measurements were carried out for determining the stoichiometry, structure, orientation, surface morphology and impurity of the crystal. The influence of these physicochemical properties of the crystals developed was evaluated in terms of their performance as a radiation detector. The best response to radiation was found for the crystals grown by the PVT technique. Significant improvement in the performance of HgI2 radiation detector was found, purifying the crystal by means of two successive growths by the PVT technique.

Źródło:

Nukleonika; 2012, 57, 4; 555-562
0029-5922
1508-5791

Pojawia się w:

Nukleonika

Dostawca treści:

Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:

Second phase morphology in the Zn-Ti0.1-Cu0.1 single crystals obtained at different growth rates
Morfologia drugiej fazy w monokryształach Zn-Ti0.1-Cu0.1 otrzymywanych przy różnych szybkościach wzrostu

Autorzy:

Boczkal, G.

Powiązania:

https://bibliotekanauki.pl/articles/355011.pdf

Data publikacji:

2012

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

monokryształy
cynk
faza międzymetaliczna
crystal structure
crystal morphology
single crystal growth
zinc compounds

Opis:

The influence of growth rate on a morphology, distribution and crystallographic relationship of the intermetallic phase Zn16Ti in Zn-Ti0.1-Cu0.1 single crystals were investigated. The crystals obtained at rates in range of from 1.8mm/h to 16mm/h were tested. In all cases a strong elongation of the Zn₁₆Ti particles along the [11-20] direction is observed. Moreover, it is found that a lamellar phase existing in the crystals develop in range of the growth rate from 6 to 10 mm/h and grows in the f10-11gplanes. In the case of the growth rate of 16mm/h oval-shaped areas of α phase (solid solution of zinc and 0.1wt.% of copper with trace content of titanium) elongated along [10-10] direction and surrounded by needle shaped precipitations are formed in the structure.
W pracy badano wpływ szybkości wzrostu monokryształów Zn-Ti0.1-Cu0.1 na morfologię, rozkład i zależności krystalograficzne fazy międzymetalicznej Zn16Ti. Do testów użyto kryształów wyhodowanych z prędkościami z zakresu od 1.8mm/h do 16mm/h. We wszystkich przypadkach zaobserwowano istnienie cząstek tylko jednej fazy Zn,sub>16Ti, wydłużonych na kierunku [11-20]. Ponadto stwierdzono, że przy szybkości wzrostu z zakresu 6 do 10mm/h, obserwowana faza międzymetaliczna ma postać płytkowa, preferująca płaszczyzny wzrostu f10-11g. W przypadku szybkości wzrostu 16mm/h zaobserwowano tworzenie się fazy iglastej, która otacza obszary czystej osnowy (roztwór stały cynku z dodatkiem 0.1% miedzi oraz niewielką zawartością tytanu) tworzące owale wydłużone na kierunku [10-10].

Źródło:

Archives of Metallurgy and Materials; 2012, 57, 2; 479-484
1733-3490

Pojawia się w:

Archives of Metallurgy and Materials

Dostawca treści:

Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:

Three Insensitive Energetic Co-crystals of 1-Nitronaphthalene, with 2,4,6-Trinitrotoluene (TNT), 2,4,6-Trinitrophenol (Picric Acid) and D-Mannitol Hexanitrate (MHN)

Autorzy:

Hong, D.
Li, Y.
Zhu, S.
Zhang, L.
Pang, C.

Powiązania:

https://bibliotekanauki.pl/articles/1063066.pdf

Data publikacji:

2015

Wydawca:

Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego

Tematy:

co-crystal
insensitive energetic material
crystal structure
explosive properties

Opis:

Co-crystallization is proposed as an effective method to alter the physicochemical properties of energetic materials, e.g. density, sensitivity and solubility. As reported in this paper, it was found that 1-nitronaphthalene could form cocrystals with TNT, picric acid and MHN in a 1:1 molecular ratio. The sensitivity and thermal stability of the 1-nitronaphthalene co-crystals was greatly improved compared with that of pure TNT, picric acid and MHN. In addition, the melting points of TNT, picric acid and MHN were lowered through co-crystallization with 1-nitronaphthalene. The electrostatic potential surface of 1-nitronaphthalene, calculated by the DFT method, showed that the electron-rich 1-nitronaphthalene has a tendency to be a proton donor and to co-crystallize with other energetic materials. The structures of the co-crystals of 1-nitronaphthalene with TNT and picric acid were characterized by single crystal X-ray diffraction (SXRD). The 1-nitronaphthalene/MHN co-crystal was studied by powder X-ray diffraction (PXRD), differential scanning calorimetry (DSC) and FTIR.

Źródło:

Central European Journal of Energetic Materials; 2015, 12, 1; 47-62
1733-7178

Pojawia się w:

Central European Journal of Energetic Materials

Dostawca treści:

Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:

Crystal-to-crystal investigations of highly thermally stable three-dimensional coordination polymer based on sodium(I) ions and 4,4’-stilbenedicarboxylic acid

Autorzy:

Groszek, Marcin
Łyszczek, Renata
Ostasz, Agnieszka
Vlasyuk, Dmytro

Powiązania:

https://bibliotekanauki.pl/articles/24085725.pdf

Data publikacji:

2023

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

coordination polymer
4,4’stilbenedicarboxylic acid
crystal structure
thermal analysis
crystal-to-crystal transformation

Opis:

The new three-dimensional coordination polymer termed {[Na2SDC(H2O)]} n (SDC2-= C16H10O42-) has been synthesized using workstation Easymax 102 while controlling the conditions and monitoring in-situ reagents. The metal complex was obtained in the reaction of sodium hydroxide with a suspension of 4,4’-stilbenedicarboxylic acid in aqueous medium. The compound was characterized by elemental analysis, single crystal, and powder X-ray diffraction methods, ATR-FTIR spectroscopy, SEM and optical microscopy, TG-DSC and TG-FTIR thermal analysis in air and nitrogen atmosphere. In the crystal structure of {[Na2SDC(H2O)]} n appears penta- and hexacoordinated sodium atoms joined by octa- and decadentate SDC2- linkers. Aqua ligand acts as bridge between Na1 and Na2 atoms. The as-synthesized sodium complex is thermally stable up to 86°C whereas its dehydrated form has extreme stability up to 491°C. Removal of water molecule leads to the crystal-to-crystal transformation yielded changes in coordination modes of COO groups. Reversibility of the hydration process in the studied complex was also examined.

Źródło:

Physicochemical Problems of Mineral Processing; 2023, 59, 4; art. no. 172683
1643-1049
2084-4735

Pojawia się w:

Physicochemical Problems of Mineral Processing

Dostawca treści:

Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:

Predicted Crystal Structures, Analysis, Impact Sensitivities and Morphology of Solid High-Energy Complexes: Alkaline-Earth Carbohydrazide Perchlorates

Autorzy:

Liu, Y.
Zhang, R.
Feng, C.-G.
Yang, L.
Zhang, T.-L.

Powiązania:

https://bibliotekanauki.pl/articles/358890.pdf

Data publikacji:

2015

Wydawca:

Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego

Tematy:

crystal structure
density of state
thermodynamic property
impact sensitivity
crystal morphology

Opis:

The crystal structures, density of states, energy gap, thermodynamic properties, impact sensitivities and morphology of beryllium carbohydrazide perchlorate ([Be(CHZ)3](ClO4)2), magnesium carbohydrazide perchlorate ([Mg(CHZ)3](ClO4)2), calcium carbohydrazide perchlorate ([Ca(CHZ)3] (ClO4)2), strontium carbohydrazide perchlorate ([Sr(CHZ)3](ClO4)2) and barium carbohydrazide perchlorate ([Ba(CHZ)3](ClO4)2) were investigated using the density functional theory (DFT) and crystal morphology theory. The results show that all of the complexes have six-coordinated distorted octahedra, which is different from previous works. This was rationalised by consideration of the intermolecular interactions in the crystal structures. Hence the crystal structure is now more reliable. The chemical reactions of the whole molecule may be triggered by an electron transition of CHZ or ClO4 −. Furthermore the energy gaps were observed, and the values of the impact sensitivities were inferred to have the following sequence: [Be(CHZ)3](ClO4)2 > [Mg(CHZ)3](ClO4)2 > [Sr(CHZ)3](ClO4)2 > [Ca(CHZ)3](ClO4)2 > [Ba(CHZ)3](ClO4)2. In addition, the thermodynamic equations at 25-1000 K were obtained. The positive values of the standard molar free enthalpies shows that carbohydrazide perchlorates are stable at 298.15 K. The (1 0 -1) and (0 0 2) faces are the most important growth directions of the crystal morphologies, and have the minimum growth rates. From the cleaved main growth faces, it can be deduced that surface active agents with active hydrogen atoms in the functional groups could be used as crystal-control reagents to control the crystal morphology for alkaline-earth carbohydrazide perchlorates.

Źródło:

Central European Journal of Energetic Materials; 2015, 12, 2; 229-248
1733-7178

Pojawia się w:

Central European Journal of Energetic Materials

Dostawca treści:

Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:

Prognosis of energetic compounds stability in solid phase

Autorzy:

Manelis, G. B.
Nazin, G. M.
Prokudin, V. G.

Powiązania:

https://bibliotekanauki.pl/articles/358925.pdf

Data publikacji:

2009

Wydawca:

Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego

Tematy:

monomolecular reactions
crystal state
retarding

Opis:

Results of the analysis and specification of phenomenological models of the monomolecular reactions running homogeneously in volume of undisturbed crystal lattice or localized on its defects are presented. It is shown, that within the limits of these models it is possible to calculate with satisfactory accuracy the ratio of rate constants in liquid and solid phases KT = kliq/ksol, and thus on known kliq to predict ksol, describing stability of substance.

Źródło:

Central European Journal of Energetic Materials; 2009, 6, 1; 31-44
1733-7178

Pojawia się w:

Central European Journal of Energetic Materials

Dostawca treści:

Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:

Comparison of binding interactions of dibromoflavonoids with transthyretin.

Autorzy:

Muzioł, Tadeusz
Cody, Vivian
Wojtczak, Andrzej

Powiązania:

https://bibliotekanauki.pl/articles/1044031.pdf

Data publikacji:

2001

Wydawca:

Polskie Towarzystwo Biochemiczne

Tematy:

dibromoflavone complex
crystal structure
transthyretin

Opis:

The crystal structure of rat transthyretin (rTTR) complex with the dibromoflavone EMD21388 was determined to 2.3 Å resolution and refined to R = 0.203 and Rfree = 0.288. Two different orientations of EMD21388, which differ in the channel penetration by 1.6 Å, were found in the A/C binding site of rTTR. The single ligand position observed in the B/D site is intermediate between the two positions found in the A/C site. The position of the dibromoflavone in the B/D site is similar to that reported for dibromoaurone in human TTR. The bromine atoms of EMD21388 form strong interactions in the P3 and P3' pockets of rTTR. Due to the different molecular architectures of both ligands, dibromoflavone forms only one interaction with Lys-15 near the channel entrance, while direct interactions with the pair of Lys-15 were reported for dibromoaurone. The C3* methyl group of EMD21388 mediates the bridging interactions between two TTR subunits in the P2 pockets. The interactions of the O2* hydroxyl group of dibromoaurone with the Thr-119 side chain in the P3 pockets are not matched by similar interactions in EMD21388. Both these alternative interactions can explain the competitive binding of 3',5'-dibromoflavonoids to transthyretin.

Źródło:

Acta Biochimica Polonica; 2001, 48, 4; 885-892
0001-527X

Pojawia się w:

Acta Biochimica Polonica

Dostawca treści:

Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:

Influence of Processing Conditions on Crystal Structure of Bi6Fe2Ti3O18 Ceramics

Autorzy:

Lisińska-Czekaj, A.
Lubina, M.
Czekaj, D.
Rerak, M.
Garbarz-Glos, B.
Bąk, W.

Powiązania:

https://bibliotekanauki.pl/articles/353909.pdf

Data publikacji:

2016

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

influence
condition
crystal structure

Opis:

Aim of the present research was to apply a solid state reaction route to fabricate Aurivillius-type ceramics described with the formula Bi₆Fe₂Ti₃O₁₈ (BFTO) and reveal the influence of processing conditions on its crystal structure. Pressureless sintering in ambient air was employed and the sintering temperatures were 850 and 1080 °C. It was found that the fabricated BFTO ceramics were multiphase ones. They consisted of two Bi_m+1Fe_m-3Ti₃O_3m+3 phases, namely the phase with m=5 (i.e. the stoichiometric phase) and m=4 (i.e. the phase with a reduced number of layers in the slab). Detailed X-ray diffraction patterns analysis showed that both phases adopted the same orthorhombic structure described with Fmm2 (42) space group. The ratio of weight fractions of the constituent phases (m=5): (m=4) was ~30:70.

Źródło:

Archives of Metallurgy and Materials; 2016, 61, 2A; 881-886
1733-3490

Pojawia się w:

Archives of Metallurgy and Materials

Dostawca treści:

Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:

The Crystal w Londynie – nowy wyznacznik w kreowaniu miast typu smart city?
The Crystal in London – a new determinant in creating smart cities?

Autorzy:

Gorgol, N. K.

Powiązania:

https://bibliotekanauki.pl/articles/345580.pdf

Data publikacji:

2017

Wydawca:

Politechnika Krakowska im. Tadeusza Kościuszki. Wydział Architektury. Katedra Kształtowania Środowiska Mieszkaniowego

Tematy:

współczesne miasto
smart city
smart building
rozwój zrównoważony
The Crystal
contemporary city
sustainable development
Crystal

Opis:

Artykuł podejmuje temat idei smart city oraz sposobu jej wdrożenia na przykładzie obiektu firmy Siemens – The Crystal w Londynie. Budynek ten jest jednocześnie obiektem typu smart building, jak i przestrzenią wystawienniczą prezentująca smart city w trzech, powiązanych ze sobą, skalach: mega, makro i mikro. Pierwsza z nich odnosi się do globalnych uwarunkowań kształtujących współczesne miasta, takich jak: coraz szybsza urbanizacja wraz z rosnącym znaczeniem miast, zmiany klimatu oraz zmiany demograficzne. Skala makro odnosi się do współczesnych miast: ich formy urbanistycznej, czy użytych instrumentów planistycznych. Skala mikro akcentuje perspektywę mieszkańca danego miasta oraz postrzeganie przez niego przestrzeni miejskiej. Autor stawia pytanie, czy zastosowana systematyka i zaprezentowane kierunki wdrażania idei smart city opartej na modelu przedstawionym w pawilonie wystawowym firmy Siemens mogą stanowić wyznacznik przy transformacji danego ośrodka.
The article tackles a problem of the smart city idea and how it has been implemented on the example of the Siemens’ building- The Crystal in London. The building is simultaneously a smart building, as well as an exhibition space presenting the smart city idea in three interconnected scales: mega, macro and micro. The mega area looks at the global megatrends which shape contemporary cities, such as: rapid urbanization with the growing importance of cities; climate change and demographic change. The macro scale refers to contemporary cities: their urban form and planning methods. The micro scale emphasizes the perspective of a inhabitant of a given city and their perception of urban space. The author poses a question whether the applied systematics and the smart city methods presented in the Siemens’ building may be a determinant in cities’ transformation.

Źródło:

Środowisko Mieszkaniowe; 2017, 19; 21-27
1731-2442
2543-8700

Pojawia się w:

Środowisko Mieszkaniowe

Dostawca treści:

Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:

Magnetoresistance effect in layered cobaltite Sr0.9Y0.1CoO2.63

Autorzy:

Bushinsky, M.
Tereshko, N.
Mantytskaya, O.
Fedotova, V.
Lanovsky, R.

Powiązania:

https://bibliotekanauki.pl/articles/118492.pdf

Data publikacji:

2018

Wydawca:

Politechnika Koszalińska. Wydawnictwo Uczelniane

Tematy:

crystal structure
magnetic structure
magnetization
magnetoresistance

Opis:

The structure and the magnetic and magnetotransport properties of the perovskite sample Sr_0.9Y_0.1CoO_2.63 have been studied using different diffraction methods and magnetization and conductivity measurements. Synchrotron X-ray diffraction shows that the sample is structurally two-phase. The majority phase has a tetragonally distorted unit cell and is described by the space group I4/mmm. A very strongly broadened superstructure peak observed at small angles in X-ray diffraction patterns at temperatures below 400 K are explained by the existence of a monoclinic phase with large unit cell whose phase fraction is much smaller than that of the tetragonal phase, but which is dominant in the sample Sr_0.8Y_0.2CoO_2.65. The spontaneous magnetization strongly increases with increasing the Y content up to 20% due to formation of the monoclinic phase. The magnetic structure is predominantly antiferromagnetic G-type with magnetic moments 1.5 μB in the layers of CoO₆ octahedra and 2 μB in the anion-deficient CoO_4+γ layers. The electrical conductivity of the sample Sr_0.9Y_0.1CoO_2.63 has semiconducting character. The magnetoresistance reaches 58% for the field B = 14 T at 5 K and decreases strongly with the increasing temperature and Y content.
Struktura i właściwości magnetyczne i magnetotransportowe perowskitu Sr_0.9Y_0.1CoO_2.63 zostały zbadane przy użyciu różnych metod dyfrakcyjnych oraz pomiarów namagnesowania i przewodnictwa. Dyfrakcja rentgenowska mierzona na synchrotronie pokazuje, że próbka ma strukturę dwufazową. Główna faza ma tetragonalnie zniekształconą komórkę elementarną i jest opisana przez grupę przestrzenną I4 /mmm. Pik o bardzo mocno poszerzonej superstrukturze obserwowano pod niewielkimi kątami w dyfraktogramach rentgenowskich w temperaturach poniżej 400 K i jest związany z istnieniem fazy monoklinowej o dużej komórce elementarnej, której frakcja fazowa jest znacznie mniejsza niż faza tetragonalna, ale która jest dominujący w próbce Sr_0.8Y_0.2CoO_2.65. Spontaniczne namagnesowanie silnie wzrasta wraz ze wzrostem zawartości Y do 20% z powodu tworzenia się fazy monoklinowej.

Źródło:

Zeszyty Naukowe Wydziału Elektroniki i Informatyki Politechniki Koszalińskiej; 2018, 13; 105-114
1897-7421

Pojawia się w:

Zeszyty Naukowe Wydziału Elektroniki i Informatyki Politechniki Koszalińskiej

Dostawca treści:

Biblioteka Nauki

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Skocz do pozycji: 11.

Tytuł:

Structure data at 150 K for diammonium oxalate monohydrate, [NH4]2[C2O4][H2O]

Autorzy:

Mielniczek-Brzóska, E.
Dmytriv, G.
Pavlyuk, V.
Griffin, A.

Powiązania:

https://bibliotekanauki.pl/articles/410252.pdf

Data publikacji:

2013

Wydawca:

Uniwersytet Humanistyczno-Przyrodniczy im. Jana Długosza w Częstochowie. Wydawnictwo Uczelniane

Tematy:

oxalates
crystal structure
X-ray diffraction

Opis:

The single crystals of perfectly quality of the diammonium oxalate monohydrate, [NH4]2[C2O4][H2O], were obtained by the improved methods of crystal growth from solution. The crystal structure of title compound was studied at 150 K using modern X-ray equipment. At this temperature, as well as at room temperature, this compound crystallizes in the orthorhombic symmetry wiith P21212 space group. The unit cell of the title compound is formed by four amonium cations, two oxalate anions and water molecules, with a 2:1:1 cation-anion-water ratio. At 150 K oxalate ion is twisted by 26.9 (1)°. The similar twist angle (26.6 (4)° was observed at the room temperature. Central carbon-carbon bond in oxalate ion is insignificantly longer (1.568 Å) in comparing with this bond at room temperature (1.559 Å).

Źródło:

Chemistry, Environment, Biotechnology; 2013, 16; 73-78
2083-7097

Pojawia się w:

Chemistry, Environment, Biotechnology

Dostawca treści:

Biblioteka Nauki

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Skocz do pozycji: 12.

Tytuł:

Molecular Structural Flexibility Dependence of Mesomorphism through Ortho–Substituted Nitro Group

Autorzy:

Ravalia, Sagarkumar U.
Dube, Mukesh R.
Bhoya, Umed C.

Powiązania:

https://bibliotekanauki.pl/articles/1193492.pdf

Data publikacji:

2021

Wydawca:

Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN

Tematy:

Liquid crystal
Mesophase
Nematogenic
Smectogenic
Thermotropic

Opis:

A novel homologous series of liquid crystalline materials of schiff’s bases viz. RO-C6H4-CH=CH-COO-C6H4-N=CH-C6H4-NO2 is synthesized and studied with a view to understanding and establishing the effect of molecular structure on liquid crystal properties and to provide novel thermotropic LC material to the scientific and technological community of research interest. The novel series consist of 12 homologues. All members of the series are enantiotropically smectogenic character. The transition temperatures were determined by an optical polarizing microscopy equipped with a heating stage. Thermal stability of smectogenic mesophase is 132.2 °C and mesophase length is varies between 4.7 °C to 32.7 °C. The LC behaviour of the novel series compared with a structurally similar known series.

Źródło:

World Scientific News; 2021, 159; 59-70
2392-2192

Pojawia się w:

World Scientific News

Dostawca treści:

Biblioteka Nauki

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Skocz do pozycji: 13.

Tytuł:

Synthesis, Characterization and Mesomorphic Study of new Homologous Chalcone Series

Autorzy:

Jain, B. B.
Patel, R. B.

Powiązania:

https://bibliotekanauki.pl/articles/1182886.pdf

Data publikacji:

2016

Wydawca:

Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN

Tematy:

liquid crystal
smectic
nematic
enantiotropic
mesomorphism

Opis:

A new designed mesogenic homologous series of chalconyl derivative with two ring α-4-Alkoxy benzoyl-β-4/-tetradecyloxy phenyl ethylenehave been synthesized and characterized by a combination of elemental analysis and standard spectroscopic methods. In series, lower members (C5 to C8) exhibit only enantiotropicnematicmesophase but higher members (C10,C12,C14,C16,C18) exhibit enantiotropicnematic as well as smecticmesophase. The nematicmesophase (Thread type) commence from C5 homologue and smecticmesophase(smectic-A type texture) commence from C10 homologue as enantiotropic and persists up to the last member synthesized. Textures are conformed by Polarizing Optical Microscope (POM). The mesomorphic properties of present series were compared with other two structurally similar series to study the effects of change of meta and para position on the mesomorphism.

Źródło:

World Scientific News; 2016, 53, 3; 241-252
2392-2192

Pojawia się w:

World Scientific News

Dostawca treści:

Biblioteka Nauki

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Skocz do pozycji: 14.

Tytuł:

Molecular Structure Dependance of Mesomorphism in Chloro Substituted Azoester Series

Autorzy:

Jadeja, U. H.
Patel, R. B.

Powiązania:

https://bibliotekanauki.pl/articles/1191208.pdf

Data publikacji:

2016

Wydawca:

Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN

Tematy:

Azoester
Liquid Crystal
Smectic
Nematic
Enantiotropy

Opis:

Azoester novel homologous series RO-CH:CH-COO-C10H6-N:N-C6H4-Cl (ortho) from trans cinnamic acid and α-napthol using ortho chloro aniline has been synthesized and studied with a view to understand and establish the relations between thermotropic liquid crystalline (LC) behaviours of homologues and their molecular structure as a consequence of molecular rigidity and flexibility with changing number of methylene unit present in left n-alkoxy group (-OR) of a molecule. Novel azoester series consists of thirteen (C1 to C18) homologues. C6 to C18 homologues are enantiotropically nematogenic with absence of smectic property. C1 to C5 members are nonliquid crystal. Textures of nematic phase and transition temperatures were determined by an optical polarising microscopy (POM) equipped with a heating stage. Textures of nematic phase are threaded or schilieren. Phase transition curves Cr-N/I and N-I behaved in normal manner in a phase diagram. Analytical and spectral data confirmed molecular structures of homologues. Nematic thermal stability is 145.12 and the degree of mesomorphism vary from 26.0 °C to 46.0 °C at the C14 and C7 homologues respectively. The LC properties of present azoester series are compared with structurally analogous series. Thus, novel series is enantiotropically nematogenic whose mesogenic range is good enough and of middle ordered melting type.

Źródło:

World Scientific News; 2016, 54; 1-13
2392-2192

Pojawia się w:

World Scientific News

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 15.

Tytuł:

Adhesion, growth and osteogenic differentiation of human bone marrow mesenchymal stem cells on positively and negatively charged ferroelectric crystal surfaces

Autorzy:

Bacakova, L.
Vandrovcova, M.
Vanek, P.
Petzelt, J.

Powiązania:

https://bibliotekanauki.pl/articles/284786.pdf

Data publikacji:

2016

Wydawca:

Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów

Tematy:

biomaterials
mesenchymal stem cells
crystal surfaces

Źródło:

Engineering of Biomaterials; 2016, 19, 138; 28
1429-7248

Pojawia się w:

Engineering of Biomaterials

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 16.

Tytuł:

Thiosulfate-copper-ammonia leaching of pure gold and pressure oxidized concentrate

Autorzy:

Porvali, A.
Rintala, L.
Aromaa, J.
Kaartinen, T.
Forsen, O.
Lundstrom, M.

Powiązania:

https://bibliotekanauki.pl/articles/110672.pdf

Data publikacji:

2017

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

gold leaching
thiosulfate
quartz crystal microbalance

Opis:

In this research cyanide-free leaching of pure gold and pressure oxidized refractory gold concentrate by thiosulfate-copper-ammonia solutions were examined. A quartz crystal microbalance (QCM) was used to study gold leaching as a factorial series where the best gold leaching rate (2.987 mg/(cm2∙h)) was achieved with a solution consisting of 0.2 M (NH4)2S2O3, 1.2 M NH3, 0.01 M CuSO4 and 0.4 M Na2SO4. Temperature had the greatest effect on the gold leaching rate. An increase in thiosulfate concentration (0.1–0.2 M) increased gold dissolution. The combined effect of temperature and ammonia concentration had a statistically significant effect on the gold leaching rate at 0.1 M M2S2O3. Combination of applied potential and NH3:S2O3 ratio had a statistically significant effect on the gold leaching rate at 0.2 M M2S2O3. An increase in applied potential decreased the gold dissolution rate at low ammonia concentrations but increased it at high concentrations. A pressure oxidized gold concentrate was leached for 6 hours in the batch reactor leaching experiments. The effect of rotative velocity (1.26–1.56 m/s) and slurry density (10–30 wt%) was investigated at the following leaching parameters: 0.2 M Na2S2O3, 0.6 M NH3, 0.01 M CuSO4, 0.4 M Na2SO4. Lower slurry density (10 wt%) resulted in a higher Au leaching efficiency. An increase in the rotation rate did not have an effect on the final Au leaching recovery. The best Au leaching efficiency (89%) was achieved with 590 rpm mixing, 1.56 m/s rotative velocity and 10 wt% slurry density.

Źródło:

Physicochemical Problems of Mineral Processing; 2017, 53, 2; 1079-1091
1643-1049
2084-4735

Pojawia się w:

Physicochemical Problems of Mineral Processing

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 17.

Tytuł:

Microstructure Evolution and Texture Development in a Cu-8.5%AT. AL Material Subjected to Hydrostatic Extrusion

Autorzy:

Jakubowska, D.
Zdunek, J.
Kulczyk, M.
Mizera, J.
Kurzydłowski, K. J.

Powiązania:

https://bibliotekanauki.pl/articles/355019.pdf

Data publikacji:

2016

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

hydrostatic extrusion
texture
XRD
single crystal

Opis:

The aim of the present paper was to investigate microstructure and texture evolution of two single crystals and polycrystal of Cu-8.5%at.Al material. All of mentioned samples were deformed by HE to achieve true strain ε = 1.17. For microstructure analyzes observations by transmission electron microscope (STEM) were done. Crystalline size for samples after SPD were determine using XRD method. The global texture measurements were done using Bruker D8 Discover diffractometer equipped in Cr radiation. Microstructure investigations revealed nanocrystalline structure in single crystals with initial orientations <110> and <100> and polycrystalline Cu-8.5%at.Al material after SPD. The global texture measurements have shown the stability of initial orientation of <100> Cu-8.5%at.Al single crystal after HE, whereas the same SPD process strongly brakes up the orientation <110> Cu-8.5%at. Al single crystal.

Źródło:

Archives of Metallurgy and Materials; 2016, 61, 2B; 933-936
1733-3490

Pojawia się w:

Archives of Metallurgy and Materials

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 18.

Tytuł:

Evolution properties of multi-Gaussian Schell model beams propagating in uniaxial crystal orthogonal to the optical axis

Autorzy:

Lu, X.
Shen, Y.
Zhu, X.
Zhao, C.
Cai, Y.

Powiązania:

https://bibliotekanauki.pl/articles/173654.pdf

Data publikacji:

2016

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

propagation properties
partially coherent
uniaxial crystal

Opis:

An analytical formula for the multi-Gaussian Schell model is derived for the beam propagating in a uniaxial crystal orthogonal to the optical axis. The propagation properties of multi-Gaussian Schell model beams in a uniaxial crystal orthogonal to the optical axis is investigated by using the analytical formula. Some results are illustrated by numerical examples related to the propagation properties of multi-Gaussian Schell model beams. It is found that the propagation properties of the multi-Gaussian Schell model beams are very different from the propagation properties in the free space. They are closely related to the initial coherence and the ratio of the extraordinary and ordinary refractive indices. The results provide a way for studying the propagation properties of the multi-Gaussian Schell model beams in the uniaxial crystal orthogonal to the optical axis.

Źródło:

Optica Applicata; 2016, 46, 1; 19-34
0078-5466
1899-7015

Pojawia się w:

Optica Applicata

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 19.

Tytuł:

Optimization of photonic crystal filter based on slack variables

Autorzy:

Yang, H.
Peng, S.
Meng, S.

Powiązania:

https://bibliotekanauki.pl/articles/173949.pdf

Data publikacji:

2017

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

photonic crystal filter
slack variables
optimization

Opis:

The improved model based on slack variables is designed to optimize a photonic crystal filter. An optimization model of the filter is established, with the transmission quantity in a stop-band as the objective function and the transmission quantity outside a stop-band as the constraint condition. The improved model is obtained by introducing slack variables in the infeasible region. With the treatment of objective and constraint functions, the optimization problem and the improved model are solved by sequential linear programming. Then the convergent solution satisfying the constraints can be found. The change of the objective function and design variables with iteration steps is presented by numerical examples, and the influence of by the constraints on the central frequency of the stop-band is discussed, indicating that the improved model is available and effective for optimization of a photonic crystal filter.

Źródło:

Optica Applicata; 2017, 47, 4; 621-633
0078-5466
1899-7015

Pojawia się w:

Optica Applicata

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 20.

Tytuł:

Growth and study of nonlinear optical crystals at the Hungarian Academy of Sciences

Autorzy:

Földvári, I.
Polgár, K.
Péter, A.
Beregi, E.
Szaller, Z.

Powiązania:

https://bibliotekanauki.pl/articles/308743.pdf

Data publikacji:

2000

Wydawca:

Instytut Łączności - Państwowy Instytut Badawczy

Tematy:

crystal growth
nonlinear optical materials

Opis:

The former Research Laboratory for Crystal Physics continues the growth and defect structure investigation of nonlinear optical single crystals in a new organization, as a part of the Research Institute for Solid State Physics and Optics, Hungarian Academy of Sciences. The aim of the activity is to prepare specific crystals for basic and applied research as well as for applications. We improve the quality or modify the properties of well known nonlinear oxide and borate crystals and develop new materials. The principle nonlinear optical crystals in our profile are the followings: Paratellurite (TeO2), congruent, Mg-doped and stoichiometric lithium niobate (LiNbO3), a variety of sillenite structured crystals (Bi12MeO20, Me=Si, Ge, Ti, etc.), bismuth tellurite (Bi2TeO5) and nonlinear borates (BBO-beta-BaB2O4, LBO-LiB3O5, LTB-Li2B4O7, CLBO-CsLiB6O10 and YAB-YAI3(BO3)4). Details of the crystal preparation and the major achievements are discussed in the paper.

Źródło:

Journal of Telecommunications and Information Technology; 2000, 1-2; 37-41
1509-4553
1899-8852

Pojawia się w:

Journal of Telecommunications and Information Technology

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 21.

Tytuł:

Glass cockpits : advantages and problems
Kokpity szklane : zalety i problemy

Autorzy:

Kłosowicz, S. J.
Zieliński, J.
Parka, J.
Olifierczuk, M.

Powiązania:

https://bibliotekanauki.pl/articles/208506.pdf

Data publikacji:

2009

Wydawca:

Wojskowa Akademia Techniczna im. Jarosława Dąbrowskiego

Tematy:

wyświetlacze ciekłokrystaliczne
zobrazowanie informacji
kokpity
samoloty
liquid crystal displays
information imaging
cockpits
aircraft
liquid crystal composite

Opis:

New trends of construction of information displays used in cockpits of different modern aircrafts are presented. The main attention is paid to the liquid crystal displays as the most commonly used nowadays and still of interest in the future. Other technologies of flat information panels interesting for the future applications are discussed. The results of theoretical works performed at the Institute of Applied Physics MUT and an example of integrated display for gliders designed there are also given.
Przedstawiono nowe kierunki konstrukcji wyświetlaczy informacyjnych do kokpitów współczesnych samolotów. Główny nacisk położono na wyświetlacze ciekłokrystaliczne jako najbardziej obecnie rozpowszechnione i perspektywiczne. Przedyskutowano inne technologie płaskich ekranów, interesujące z punktu widzenia przyszłych zastosowań. Przedstawiono również wyniki prac teoretycznych oraz przykład zintegrowanego wyświetlacza dla szybowca skonstruowanego w Instytucie Fizyki Technicznej WAT.

Źródło:

Biuletyn Wojskowej Akademii Technicznej; 2009, 58, 1; 69-85
1234-5865

Pojawia się w:

Biuletyn Wojskowej Akademii Technicznej

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 22.

Tytuł:

Clinopyroxene from an alkali pyroxenite xenolith, Louená-Oberwiesenthal Volcanic Centre, Bohemian Massif: crystal chemistry and structure

Autorzy:

Ulrych, D.
Niznansky, D.
Pertlik, F.
Giester, G.
Ertl, A.
Brandstätter, F.

Powiązania:

https://bibliotekanauki.pl/articles/2058921.pdf

Data publikacji:

2006

Wydawca:

Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy

Tematy:

Krušné hory/Erzgebirge Mts.
lower crust origin
alkali pyroxenite xenoliths
crystal chemistry
crystal structure
clinopyroxene

Opis:

Alkali pyroxenite (and ijolite) xenoliths occur in the Tertiary Loučná-Oberwiesenthal Volcanic Centre associated with the Ohře/Eger Rift. The alkali pyroxenite xenoliths represent fragments of an intracrustal complex with Sr-Nd isotope ratios consistent with mantle sources of HIMU-affinity. The crystal structure of diopside from an alkali pyroxenite xenolith with the formula (...) and the lattice parameters a = 9.773(2), b = 8.886(2), c = 5.308(1) [] and = 105.89(3) [°] was refined to an R-value of 0.025 for 1174 reflections. The mean interatomic distances are: within theMe1-O6 octahedron <2.067> , within theMe2-O8 polyhedron <2.498> . The last value reflects the occupation of this atomic position by significant amounts of Fe2+ and Ti4+. The enlargement determined for the bond length to 1.657 is in accordance with the site population for this position: (Si1.69Al0.31). The molar ratio Fe2+/Fe3+ determined by Mössbauer spectroscopy is equal to 0.786. The AlIV deficiency in T-sites of clinopyroxene of rims is negligible (up to 0.019 a.p.f.u.) restricted to sporadic local electronmicroprobe analyses. The presence of Fe3+ in the T-position of Si- and Al-poor clinopyroxenes was not confirmed by X-ray structural analyses because of its low quantity. Nevertheless, the Mössbauer spectroscopy measurements (isomer shift of 0.36 mm/s) imply that Fe3+ is present only in the Me1-O6 positions.

Źródło:

Geological Quarterly; 2006, 50, 2; 257-264
1641-7291

Pojawia się w:

Geological Quarterly

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 23.

Tytuł:

Investigation on Nucleation Kinetics, Growth and Nonlinear Optical Properties of L-Cystine Hydrochloride Crystal

Autorzy:

Manivannan, D.
Kirubavathi, K.
Selvaraju, K.

Powiązania:

https://bibliotekanauki.pl/articles/1029827.pdf

Data publikacji:

2018-01

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

crystal growth
nucleation kinetics
optical materials
NLO

Opis:

The semiorganic nonlinear optical crystal of amino-carboxyl acid family, L-cystine hydrochloride (LCHCl) was successfully grown from its aqueous solution by the slow evaporation solution growth method. The solubility, metastable zone width and induction period were determined for the first time experimentally and there by the possibility of growing bulk crystals of LCHCl using deionized water as solvent. The induction period was recorded for the different supersaturation ratios (S=1.2, 1.3, 1.4, and 1.5), which reveals that the induction period of LCHCl decreases with increase in supersaturation. The nucleation kinetic parameters such as critical free energy, change of volume free energy, critical radius, number of molecules in the critical nucleus and nucleation rate have been evaluated for LCHCl crystals. The interfacial energy values of LCHCl were determined for different supersaturation ratio by means of varying temperatures. The single crystal X-ray diffraction gives the lattice parameters value of the grown crystals. The second harmonic generation efficiency was confirmed by the Kurtz-Perry powder method. The laser damage threshold energy of the grown crystal indicates that grown crystal has excellent resistance to laser radiation also compared with known other nonlinear optical crystals.

Źródło:

Acta Physica Polonica A; 2018, 133, 1; 63-67
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 24.

Tytuł:

Synthesis and biological activity of pyrazole and 1,2,3-triazole containing heterocyclic compounds

Autorzy:

Bhola, Yogesh
Naliapara, Ashutosh
Modi, Jigna
Naliapara, Yogesh

Powiązania:

https://bibliotekanauki.pl/articles/1076027.pdf

Data publikacji:

2019

Wydawca:

Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN

Tematy:

XRD crystal
antibacterial
azides
hydrazones
pyrazol
triazole

Opis:

As heterocyclic compounds show good biological activity, we have synthesized nitrogen containing compounds among them 9a, 9c, 9e and 9f have shown very good antimicrobial activity with remarkable inhibition zones. N'-((5-chloro-3-methyl-1-phenyl-1H-pyrazol-4-yl)methylene)-5-methyl-1-phenyl-1H-1,2,3-triazole-4-carbohydrazide (9a-i, 10) was synthesized from 5-(aryloxy)-3-methyl-1-phenyl-1H-pyrazole-4-carbaldehyde and 5-methyl-1-phenyl-1H-1,2,3-triazole-4-carbohydrazide by condensation in acidic media. 5-(aryloxy)-3-methyl-1-phenyl-1H-pyrazole-4-carbaldehyde and 5-methyl-1-phenyl-1H-1,2,3-triazole-4-carbohydrazide were synthesized from phenyl hydrazine and substituted anilines respectively. All intermediates and final compounds were confirmed by 1H-NMR, 13C-NMR, Mass Spectroscopy methods and compound 9c was confirmed by single XRD analysis.

Źródło:

World Scientific News; 2019, 117; 29-43
2392-2192

Pojawia się w:

World Scientific News

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 25.

Tytuł:

Setting an Upper-Wavelength Limit to the Supercontinuum Generated in a Photonic Crystal Fibre

Autorzy:

Tartara, L.
Degiorgio, V.
Cherif, R.
Zghal, M.

Powiązania:

https://bibliotekanauki.pl/articles/308817.pdf

Data publikacji:

2009

Wydawca:

Instytut Łączności - Państwowy Instytut Badawczy

Tematy:

nonlinear optics
photonic crystal fibres
supercontinuum generation

Opis:

We report about a novel kind of supercontinuum generation in a photonic crystal fibre in which the spectral broadening occurs only on the blue side of the pump wavelength. As a consequence a limit to the extent of the supercontinuum is set and thus a way for tailoring the broadened spectrum according to a peculiar application is provided. We present a theoretical explanation along with experimental data which are supported by the results of a set of numerical simulations.

Źródło:

Journal of Telecommunications and Information Technology; 2009, 1; 34-37
1509-4553
1899-8852

Pojawia się w:

Journal of Telecommunications and Information Technology

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 26.

Tytuł:

Properties of a fibre optic strain sensor in the configuration of a Mach-Zehnder modal interferometer with a polarization maintaining photonic crystal fibre

Autorzy:

Kaczmarek, C.

Powiązania:

https://bibliotekanauki.pl/articles/221393.pdf

Data publikacji:

2018

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

photonic crystal fibre
modal interferometer
temperature sensitivity

Opis:

The paper presents the properties of a strain sensor, which was made using the micro hole collapse method and operates in the configuration of a Mach-Zehnder modal interferometer with a PM-1550-01 polarization maintaining photonic crystal fibre. The sensor’s transfer curve was determined analytically. Its strain sensitivity, determined from measurements, decreases slightly with increasing wavelength and is in a range from -2.01 to -2.23 pm/με in the wavelength range 1520-1580 nm. Based on the Fourier analysis of the wavelength spectrum of the constructed sensor, the difference of the group refractive indices of the core and the cladding of the photonic crystal fibre was determined, which are in a range from 7.45·10^-3 to 1.01·10^-2. The temperature sensitivity of the sensor, determined on the basis of measurements performed in a range from 23 to 60°C, is positive and equals 5.9 pm/K.

Źródło:

Metrology and Measurement Systems; 2018, 25, 2; 417-424
0860-8229

Pojawia się w:

Metrology and Measurement Systems

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 27.

Tytuł:

The optimization of the dielectric layer photonic crystal filter by the quadratic response surface methodology

Autorzy:

Yang, H.
Meng, S
Wang, G.
Huang, C.

Powiązania:

https://bibliotekanauki.pl/articles/174592.pdf

Data publikacji:

2015

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

optimization
photonic crystal filter
response surface methodology

Opis:

Dielectric layer photonic crystal filter structures in waveguide are optimized by the quadratic response surface methodology. The optimization model of the filter is established on the basis of the analysis which is conducted with the aid of the response surface methodology. The model is solved using sequential quadratic programming and the optimal parameters are obtained. Examples demonstrate it is effective.

Źródło:

Optica Applicata; 2015, 45, 3; 369-379
0078-5466
1899-7015

Pojawia się w:

Optica Applicata

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 28.

Tytuł:

Towards tuning of thermal sensitivity of the long period fiber gratings using a liquid crystal layer

Autorzy:

Czapla, A.
Bock, W.
Mikulic, P.
Woliński, T.

Powiązania:

https://bibliotekanauki.pl/articles/200642.pdf

Data publikacji:

2010

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

long period fiber grating
liquid crystal
sensors

Opis:

A high-efficiency thermal tuning filter based on a long-period fiber grating (LPFG) combined with a low-birefringence liquid crystal (LB LC) cladding layer is presented. Two types of LPFGs were studied and compared: the LPFGs based on a standard telecommunication fiber produced by an electric arc technique, and the LPFGs based on a boron co-doped fiber written by a UV technique. Both types of LPFGs when enhanced with an external LB LC layer exhibit two different temperature sensitivities, which depend on the temperature range of operation. For the LPFGs based on standard telecommunication fiber we can conclude that the presence of the LB LC cladding increases the thermal tuning efficiency by more than one order of magnitude over the value for the LPFGs in air. In the case of the LPFGs based on the boron co-doped fiber we discovered it is possible to obtain either a temperature-independent attenuation band or the attenuation bands with high temperature sensitivities, just by careful choice of the order of the cladding mode and the operating wavelength.

Źródło:

Bulletin of the Polish Academy of Sciences. Technical Sciences; 2010, 58, 4; 503-508
0239-7528

Pojawia się w:

Bulletin of the Polish Academy of Sciences. Technical Sciences

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 29.

Tytuł:

Stabilization Studies of Crystal Structure of Optimally Th-Doped Lead Zirconate Perovskite

Autorzy:

Elsabawy, Khaled M.
El-Hawary, Waheed F.

Powiązania:

https://bibliotekanauki.pl/articles/1191373.pdf

Data publikacji:

2016

Wydawca:

Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN

Tematy:

Crystal Structure
Doping
Perovskite
Visualization
XRD

Opis:

The optimally thorium-doped Pb0.9Th0.1ZrO3 was selected for studying thorium doping effect on the structural parameters of lead zirconate crystal. The investigations were made on the low concentrations range of thorium doping 0.0 ≤ x ≤ 0.25 mole. The present investigations are concerned by confirming that thorium dopings play an important role as stabilizing agent inside internal structure of crystal lattice of Pb1-xThxZrO3 where x = 0.1 mole. XRD-measurements indicated that Thorium dopant substitutes successfully on the A-sites of lead zirconate without damaging the main crystal structure at x = 0.1 mole. Visualization and theoretical investigations were concerned by matching and comparison of bond distances ,torsions on angles of investigated compound to clarify success of thorium doping on the perovskite structure.

Źródło:

World Scientific News; 2016, 33; 56-66
2392-2192

Pojawia się w:

World Scientific News

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 30.

Tytuł:

Comparison study of crystal and electronic structures for chalcopyrite $(CuFeS_2)$ and pyrite $(FeS_2)$

Autorzy:

Li, Yuqiong
Liu, Yingchao
Chen, Jianhua
Zhao, Cuihua
Cui, Weiyong

Powiązania:

https://bibliotekanauki.pl/articles/1448811.pdf

Data publikacji:

2021

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

chalcopyrite
pyrite
crystal structures
electronic structures

Opis:

Chalcopyrite $(CuFeS_2)$ and pyrite $(FeS_2)$ are commonly associated with each other, and they both belong to semiconductor minerals. The difference in crystal and electronic structures is an important factor for their flotation separation. Using the density functional method (DFT) combined with Hubbard U correction, their crystal and electronic properties are comparatively studied. The calculated results suggest that the use of antiferromagnetic calculations and Hubbard U correction are very important to the accuracy of the chalcopyrite results. Antiferromagnetic calculations combined with a U value of 2.0 eV on chalcopyrite show a band gap of 0.53 eV, which is very consistent with the experimental results of ~0.5 eV. The density of states (DOS) and Mulliken bond population results indicate that stronger hybridization between Fe 3d and S 3p states in chalcopyrite than in pyrite leads to a stronger covalency of Fe-S bonds in chalcopyrite, causing a reduction in the spin magnetic moment (3.5 μB) from the ideal value. In addition, the greater covalency of bonds in chalcopyrite results in greater hydrophobicity of chalcopyrite than pyrite. The DOS results suggest that S has similar electronic properties in pyrite and chalcopyrite. The oxidation states of Fe and Cu ions in chalcopyrite are discussed based on the coordination field theory according to the calculation results, which confirms an oxidation state of $Fe^{3+}Cu^{1+}S_2$.

Źródło:

Physicochemical Problems of Mineral Processing; 2021, 57, 1; 100-111
1643-1049
2084-4735

Pojawia się w:

Physicochemical Problems of Mineral Processing

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 31.

Tytuł:

Próba "Orła" : szkolenie specjalistyczne

Autorzy:

Gazda, Stanisław.

Powiązania:

Wojska Lądowe 2000, nr 5, s. 14

Data publikacji:

2000

Tematy:

"Crystal Eagle 2000" (ćwiczenia wojskowe) organizacja

Opis:

Fot.

Dostawca treści:

Bibliografia CBW

/5

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Skocz do pozycji: 32.

Tytuł:

Cyprian Norwid w Crystal Palace albo czy istnieje światopogląd modernistyczny Norwida?
Cyprian Norwid in Crystal Palace or does the Norwid’s modern view of the world exist?

Autorzy:

Samsel, Karol

Powiązania:

https://bibliotekanauki.pl/articles/967375.pdf

Data publikacji:

2016

Wydawca:

Uniwersytet Łódzki. Wydawnictwo Uniwersytetu Łódzkiego

Tematy:

Fyodor Dostoevsky
Modernism
Romanticism
eschatology
Cyprian Norwid
Crystal Palace
fiodor dostojewski
crystal palace
modernizm
romantyzm
eschatologia
cyprian norwid

Opis:

The author of the article aims to add his voice to the debate (fundamental for the studies of Norwid) on the tangled historical and literary origin of Cyprian Norwid and methods of legitimising it: the romantic and modernist. Although the text is clearly seeking a new language to talk about Norwid’s association with the subsequent modernist era (to describe Norwid’s case the author uses the term “fuzzy modernism,” while calling the poet himself “ an eschatologist of modernism,” distinct in this respect from the apparently similar Fyodor Dostoyevsky – modernist eschatologist), the ultimate conclusion is the Polish poet should be placed in the contaminated trend. Also suggested is a need for a study of his literary works that would provide a double model of the nineteenth background of Norwid’s text: as romantic, and at the same time modernist. As a symbol of Norwid’s modernity’s the author chooses London’s Crystal Palace, a place that Norwid (like Dostoyevsky) visited between 3 and 13 December 1852.

Źródło:

Acta Universitatis Lodziensis. Folia Litteraria Polonica; 2016, 33, 3
1505-9057
2353-1908

Pojawia się w:

Acta Universitatis Lodziensis. Folia Litteraria Polonica

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 33.

Tytuł:

Xe and Kr bonding abilities in the single crystal oxygen vacancies of the uranium based fuel

Autorzy:

Dąbrowski, L.
Szuta, M.

Powiązania:

https://bibliotekanauki.pl/articles/147880.pdf

Data publikacji:

2012

Wydawca:

Instytut Chemii i Techniki Jądrowej

Tematy:

noble gases
chemical bond
UO2 single crystal
valence electron density distribution
atomic force constants
bond energy
crystal lattice

Opis:

The valence electron density distribution of krypton and xenon located in the oxygen vacancy and in its nearest neighbourhood was performed by application of the method “ab initio”. The results are presented on the graphs. The bonding energies of krypton and xenon in the uranium dioxide crystal lattice were calculated. It was found also that krypton and xenon cause a local increase of UO1.75Xe0.25 and UO1.75Kr0.25 unit cell and cause its deformation what is presented in tables. The force constants of krypton and xenon were also assigned what gives evidence about the strong bond of krypton and xenon with the UO1.75Xe0.25 and UO1.75Kr0.25 single crystal lattice. Obtained results are compared with the analogical studies of He atom incorporation into UO2 single crystal lattice.

Źródło:

Nukleonika; 2012, 57, 1; 95-100
0029-5922
1508-5791

Pojawia się w:

Nukleonika

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 34.

Tytuł:

Influence of crystallographic orientation on creep resistance of single-crystal superalloy

Autorzy:

Kościelniak, Barbara
Gancarczyk, Kamil
Poręba, Marek
Albrecht, Robert

Powiązania:

https://bibliotekanauki.pl/articles/176142.pdf

Data publikacji:

2020

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

CMSX-4 superalloys
creep resistance
crystal orientation
microstructure

Opis:

This paper focuses on the influence of crystallographic orientation on creep resistance of CMSX-4 nickel-based superalloy. The single-crystal rods of CMSX-4 superalloy were manufactured with the use of the Bridgman method at a withdrawal rate of 3 mm/min. The crystallographic orientation of the rods was determined by the X-ray Ω-scan method with OD-EFG diffractometer and the Laue back-reflection technique. The creep tests were performed at a temperature of 982°C and the value of stress σ = 248 MPa. Microstructural investigation before and after the creep test of CMSX-4 superalloy was performed using a scanning electron microscope. The results showed that the distribution of the values of α angle strongly affects the creep resistance of a single-crystal superalloy

Źródło:

Advances in Manufacturing Science and Technology; 2020, 44, 3; 93-98
0137-4478

Pojawia się w:

Advances in Manufacturing Science and Technology

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 35.

Tytuł:

Mechanism of nanostructure formation on a surface of CdZnTe crystal by laser irradiation

Autorzy:

Medvid', A.
Mychko, A.
Gnatyuk, V. A.
Levytskyi, S.
Naseka, Y.

Powiązania:

https://bibliotekanauki.pl/articles/385161.pdf

Data publikacji:

2009

Wydawca:

Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Automatyki i Pomiarów

Tematy:

self-organizing structure
Nd:YAG laser
CdZnTe crystal

Opis:

Self-organizing nanometer size structures are observed on the surface of CdZnTe crystal irradiated by strongly absorbed Nd:YAG laser irradiation (LR) at intensity range of 4-12 MW/cm2. According to this model the Thermogradient effect has the main role in the interaction process of LR and semiconductors. The surface state of the CdZnTe under the influence of Nd:YAG laser irradiation has been studied. A state has been defined by atom force microscope. The influence of LR on the photoluminescence spectrahas show that at a threshold intensity of LR I=4 MW/cm2 creation of nanometer size structure begins. A graded band gap structure with optical window was formed at the top of nano-hills.

Źródło:

Journal of Automation Mobile Robotics and Intelligent Systems; 2009, 3, 4; 127-129
1897-8649
2080-2145

Pojawia się w:

Journal of Automation Mobile Robotics and Intelligent Systems

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 36.

Tytuł:

Laboratory tests of stand-alone hydraulic piezo-valve

Autorzy:

Skorupka, Z.

Powiązania:

https://bibliotekanauki.pl/articles/244697.pdf

Data publikacji:

2018

Wydawca:

Instytut Techniczny Wojsk Lotniczych

Tematy:

laboratory testing
hydraulic valve
flow control
piezo crystal

Opis:

Flow control inside the aviation landing gear shock absorbers is nowadays performed by fixed orifices or by the half-active spring based valves located inside of the device. All of the mentioned solutions are optimized on limited, mostly to one, landing scenarios due to their non-adjustable nature (even spring based valves are treated as passive due to their lack of actual real-time controllability). The easiest way of full hydraulic fluid flow control is to mount in its way a valve, which is able to seamlessly open and close causing the flow to change in wide range. Unfortunately, most of the used solutions are too large or not fast enough to fit the shock absorber requirements. The most promising way is to design tailor-made valve based on a piezo crystal actuator, which is most suitable due to its size and speed. Such a design has been made and tested by the engineers of the Institute of Aviation in Warsaw in Landing Gear Laboratory. In this article, the author describes test campaign of the hydraulic piezo-valve. Several tests have been made in order to assess the design correctness and to determine the basic parameters of the valve. Achieved results, presented in this article, show the full functionality of the solution in laboratory tests according to the design assumptions [8].

Źródło:

Journal of KONES; 2018, 25, 4; 385-381
1231-4005
2354-0133

Pojawia się w:

Journal of KONES

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 37.

Tytuł:

Structural Characterization of Multicomponent High Entropy Alloys Processed by Mechanical Alloying

Autorzy:

Mohapatra, Ramesh Chandra
Barad, Bharat Bidhan
Panigrahi, Ajit

Powiązania:

https://bibliotekanauki.pl/articles/1066151.pdf

Data publikacji:

2019

Wydawca:

Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN

Tematy:

Ball milling
HEAs
XRD
crystal structure
traditional alloy

Opis:

Today’s challenge is focused on the reserch and development of best quality and nobel property materials. So new alloys have been developed at the turn of the new millennium referred to as high entropy alloys. These alloys have been achieved through equiatomic substitution, by replacing individual components with multi-component equiatomic or near-equiatomic mixtures of chemically similar species. The present work includes the processing of Multi-component high entropy alloys (HEA) FeNiCoCrCu. The HEA is synthesized by ball milling, Milling hour varies from 0 hour to 40 hour. For the structural analysis X-Ray Diffraction (XRD) as characterization technique is adopted. XRD analyses shows that the intensity of the peaks corresponding to BCC and HCP crystal structures get reduced with increase in milling time. An affinity to FCC phase formation is observed with increase in milling time. The lattice parameter of individual component was determined viz. Bragg’s method.

Źródło:

World Scientific News; 2019, 131; 1-14
2392-2192

Pojawia się w:

World Scientific News

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 38.

Tytuł:

Localized f electron aspect in heavy-germion intermetallic YbRh₂Si₂

Autorzy:

Radwanski, R.
Nalecz, D.
Fedyk, S.
Ropka, Z.

Powiązania:

https://bibliotekanauki.pl/articles/1048149.pdf

Data publikacji:

2018-03

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

Heavy fermion
crystal field
Kondo resonance
YbRh₂Si₂

Opis:

We point out that there is more and more experiments showing the almost perfect localization of thirteen f-electrons in the canonical heavy-fermion system: YbRh₂Si₂. The revealing of the Yb³⁺ crystal-field (CEF) states confirms the Quantum Atomistic Solid State Theory. QUASST was the only theory, which has claimed from 1992 the existence of the discrete CEF electronic structure and the Kramers doublet ground state in heavy-fermion intermetallics. The removal of the on-site Kramers degeneracy via spin-dependent interactions is origin of the large specific heat at low temperatures (a hallmark of the heavy-fermion phenomena) and of low-energy neutral spin-like excitations. The Kondo resonance is related to the slight splitting of the Kramers doublet ground state of the Yb³⁺ ion.

Źródło:

Acta Physica Polonica A; 2018, 133, 3; 387-390
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 39.

Tytuł:

Metal Pillared Bentonite Synthesis and Its Characteristics Using X-Ray Diffraction

Autorzy:

Sisnayati
Said, Muhammad
Aprianti, Nabila
Komala, Ria
Dwipayana, Hendra
Faizal, Muhammad

Powiązania:

https://bibliotekanauki.pl/articles/2202294.pdf

Data publikacji:

2022

Wydawca:

Polskie Towarzystwo Inżynierii Ekologicznej

Tematy:

crystal structure
natural bentonite
pillared bentonite
Al/Fe

Opis:

Modification of bentonite by the Al/Fe metal oxide pillarization process was carried out with metal oxides. The bentonite pillars were successfully characterized using an X-Ray Diffraction (XRD) spectrophotometer. The results of XRD characterization showed the peak diffraction angle (2θ) in metal-pillared bentonite was 26.84° at 698.98 cps. Meanwhile, in thermally and chemically activated bentonite, the peak angles were marked at 20.64° and 26.7°. There is a shift in the peak angle after activation and pillarization. XRD patterns showed dioctahedral smectite and quartz accessory minerals.

Źródło:

Journal of Ecological Engineering; 2022, 23, 12; 68--74
2299-8993

Pojawia się w:

Journal of Ecological Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 40.

Tytuł:

KH2PO4 crystallisation from potassium chloride and ammonium dihydrogen phosphate

Autorzy:

Jančaitienė, K.
Šlinkšienė, R.

Powiązania:

https://bibliotekanauki.pl/articles/778511.pdf

Data publikacji:

2016

Wydawca:

Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie

Tematy:

potassium dihydrophosphate
ammonium dihydrophosphate
molar ratio
crystallization
crystal

Opis:

Seeking to obtain bulk (NPK – nitrogen, phosphorus, potassium), chlorine-free fertilizers, the influence of interaction between potassium chloride and ammonium dihydrogen phosphate in aqueous solutions at temperature of 20, 40, 60 and 80°C has been investigated. Components of the solid phase have been identified by methods of chemical and instrumental analysis: radiography (X – ray), infra – red molecular absorption spectroscopy (IR) and scanning electron microscopy (SEM). It has been observed that the largest amount of solid state potassium dihydrogen phosphate was obtained at 60–80°C, when the potassium chloride and ammonium dihydrogen phosphate molar ratio is equal 0.8:0.2. Changing the molar ratio of 0.5:0.5 to 0.8:0.2, and with increasing temperature, various shaped crystals have developed in the remaining aqueous solutions with a morphology shifting from sharp needles to tetragonal prism.

Źródło:

Polish Journal of Chemical Technology; 2016, 18, 1; 1-8
1509-8117
1899-4741

Pojawia się w:

Polish Journal of Chemical Technology

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 41.

Tytuł:

Channel drop filter based on photonic crystal ring resonator

Autorzy:

Alipour-Banaei, H.
Jahanara, M.
Mehdizadeh, F.

Powiązania:

https://bibliotekanauki.pl/articles/174022.pdf

Data publikacji:

2018

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

photonic crystal
optical filter
ring resonator
quality factor

Opis:

Photonic crystal ring resonators are promising candidates for realizing all optical filters with acceptable transmission efficiency and quality factor values. In this paper, by putting a hexagon-shaped structure at the middle of on 7 × 7 square cavity we created a ring resonator structure and designed a channel drop filter. The drop wavelength of our filter is at 1550.4 nm, with transmission efficiency and quality factor equal to 94% and 707, respectively. Our structure is composed of dielectric rods immersed in air. Because in this kind of structures the dominant band gap is in TM mode, all of our simulations have been done in TM mode. The total footprint of our filter is 199.4 μm², which makes it suitable for all optical integrated circuits.

Źródło:

Optica Applicata; 2018, 48, 4; 601-608
0078-5466
1899-7015

Pojawia się w:

Optica Applicata

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 42.

Tytuł:

Effect of Rotation on the Piezoelectric Wave Impedance Characteristics

Autorzy:

Yuan, Xiaoguang
Hao, Chaoyu
Jiang, Quan

Powiązania:

https://bibliotekanauki.pl/articles/31339852.pdf

Data publikacji:

2023

Wydawca:

Polska Akademia Nauk. Czasopisma i Monografie PAN

Tematy:

wave impedance
Coriolis acceleration
piezoelectric crystal
wave velocity

Opis:

The dependence of piezoelectric wave impedance on the rotation speed is investigated theoretically and numerically. The Coriolis force due to rotation is introduced into the piezoelectric motion equations, which is solved by the harmonic plane wave solution. It is shown that the wave impedance variations of longitudinal and transverse waves due to rotation are clearly different. The longitudinal wave impedance continuously increases with a small rotation ratio and one transverse wave impedance is almost irrespective of a rotation ratio. In contrast, the rotation applies a big impact on the other transversal wave impedances in the piezoelectric crystal which decreases monotonically with the rotation speed. Such characteristics are significant in piezoelectric transducers and sensors.

Źródło:

Archives of Acoustics; 2023, 48, 3; 231-234
0137-5075

Pojawia się w:

Archives of Acoustics

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 43.

Tytuł:

An efficient Monte Carlo Potts method for the grain growth simulation of single-phase systems

Autorzy:

Maazi, Noureddine
Lezzar, Balahouane

Powiązania:

https://bibliotekanauki.pl/articles/29520251.pdf

Data publikacji:

2020

Wydawca:

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

Tematy:

alloys
crystal growth
Monte Carlo simulation
microstructure

Opis:

The choice of the lattice sites to be reoriented in the Monte Carlo Potts algorithm for grain growth simulation is repeated in a non-homogeneous way. Therefore, some grains are favorably growing than others. This fact may seriously affect the simulation results. So a modified MC method is presented. Lattice sites are selected for reorientation one by one following their positions in the matrix in each Monte Carlo step (mcs). This approach ensures that the various selections of one lattice site within every mcs are eliminated, and no favorable growth of grains at the expense of others. The calculation time considerably decreases. The effect of real-time and physical temperature on the grain growth kinetics is discussed.

Źródło:

Computer Methods in Materials Science; 2020, 20, 3; 85-94
2720-4081
2720-3948

Pojawia się w:

Computer Methods in Materials Science

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 44.

Tytuł:

A new design of a photonic crystal fiber with a beam shaping effect and flexible management of dispersion and confinement loss

Autorzy:

Huang, Y.
Jiang, P
Yang, H.
Yu, M.

Powiązania:

https://bibliotekanauki.pl/articles/173817.pdf

Data publikacji:

2014

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

photonic crystal fiber
hollow beam
chromatic dispersion

Opis:

A new design of a guiding-index photonic crystal fiber which possesses a beam shaping effect and flexible control of dispersion has been proposed in this paper. It can shape a Gaussian beam into a circular hollow beam with certain dimension, which can be used in optical communication systems with a Cassegrain antenna to improve transmission efficiency by avoiding the loss of energy caused by the subreflector center reflection. In addition, its dispersion and confinement loss can be changed in a broad range by slightly adjusting structural parameters under condition that the hollow beam dimension remains about the same. Fairly practical properties, zero dispersion or flattened dispersion, can be obtained when structural parameters are set appropriately. A series of models with different parameters are analyzed and compared. Results of numerical simulation show that the ultra-low dispersion of 1.802 ps/km/nm can be obtained when λ = 1.31 μm. Several modest design parameters are given as well.

Źródło:

Optica Applicata; 2014, 44, 3; 375-387
0078-5466
1899-7015

Pojawia się w:

Optica Applicata

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 45.

Tytuł:

Simple method for characterization of photonic crystal fibers

Autorzy:

Szustakowski, M.
Pałka, N.
Grabiec, W.

Powiązania:

https://bibliotekanauki.pl/articles/308773.pdf

Data publikacji:

2007

Wydawca:

Instytut Łączności - Państwowy Instytut Badawczy

Tematy:

photonic crystal fibers
far field distribution
characterization

Opis:

We report on our experimental characterization of index-guiding photonic crystal fibers (PCF) from their far field intensity distribution. The algorithm presented below makes it possible to determine the geometrical parameters of the PCF (core diameter, air hole spacing and air hole diameter) from its far field pattern. We obtained good agreement with the manufacturer's data for all fibers tested.

Źródło:

Journal of Telecommunications and Information Technology; 2007, 2; 109-113
1509-4553
1899-8852

Pojawia się w:

Journal of Telecommunications and Information Technology

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 46.

Tytuł:

Nonlinear and linear pressure determination in a two-layer structure: solid crystal - water at GHz frequencies

Autorzy:

Filipczyński, L.
Wójcik, J.
Kujawska, T.

Powiązania:

https://bibliotekanauki.pl/articles/332574.pdf

Data publikacji:

2003

Wydawca:

Polskie Towarzystwo Akustyczne

Tematy:

pressure determination
solid crystal
water
GHz frequencies

Opis:

Determination of acoustic pressures at the frequency of 1 GHz by means of PVDF hydrophones is not possible due to their limited frequency response. Moreover, the size of their active electrodes is by about 3 orders of magnitude greater than the resolution in the acoustic microscopes at such a high frequency. Therefore the authors solved this problem at first in a microscope with the working frequency of 34 MHz using both the numerical and experimental methods. A numerical procedure of nonlinear propagation and transducer power measurements were applied giving in effect the same quantitative results. Therefore the identical numerical procedure was used for the l GHz microscope working in the reflection mode. Many pressure field quantities of the microscope were shown, e.g. the pressure values, distributions of the first, second, third and fourth pressure harmonics in and outside of the focus, pulse distortions and their spectra, the resolutions achieved etc. The obtained information on nonlinear propagation effects in microscopy was previously lacking.

Źródło:

Hydroacoustics; 2003, 6; 143-150
1642-1817

Pojawia się w:

Hydroacoustics

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 47.

Tytuł:

Prediction of the Density of Energetic Materials on the Basis of their Molecular Structures

Autorzy:

Rahimi, R.
Keshavarz, M. H.
Akbarzadeh, A. R.

Powiązania:

https://bibliotekanauki.pl/articles/358109.pdf

Data publikacji:

2016

Wydawca:

Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego

Tematy:

crystal density
energetic compound
QSPR
MLR
ANN

Opis:

The density of an energetic compound is an essential parameter for the assessment of its performance. A simple method based on quantitative structure-property relationship (QSPR) has been developed to give an accurate prediction of the crystal density of more than 170 polynitroarenes, polynitroheteroarenes, nitroaliphatics, nitrate esters and nitramines as important classes of energetic compounds, by suitable molecular descriptors. The evaluation techniques included cross-validation, validation through an external test set, and Y-randomization for multiple linear regression (MLR) and training state analysis for artificial neural network (ANN), and were used to illustrate the accuracy of the proposed models. The predicted MLR results are close to the experimental data for both the training and the test molecular sets, and for all of the molecular sets, but not as close as the ANN results. The ANN model was also used with 20 hidden neurons that gave good result. The results showed high quality for nonlinear modelling according to the squared regression coefficients for all of the training, validation and the test sets (R2 = 0.999, 0.914 and 0.931, respectively). The calculated results have also been compared with those from several of the best available predictive methods, and were found to give more reliable estimates.

Źródło:

Central European Journal of Energetic Materials; 2016, 13, 1; 73-101
1733-7178

Pojawia się w:

Central European Journal of Energetic Materials

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 48.

Tytuł:

Energetic Nitrogen-rich Salts

Autorzy:

Wu, J.-W.
Zhang, J.-G.
Zhang, T.-L.
Yang, L.

Powiązania:

https://bibliotekanauki.pl/articles/358479.pdf

Data publikacji:

2015

Wydawca:

Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego

Tematy:

energetic salts
synthesis
characterization
crystal structure
review

Opis:

Energetic salts as a unique class of energetic materials have recently been investigated widely, since they possess advantages over their atomically similar nonionic analogues – they tend to exhibit lower vapor pressures, higher densities and better thermal stabilities. Furthermore, these salts are readily improved upon by the appropriate combination of different cations and anions. Over the last twenty years, our group has continued to synthesize and study novel ionic energetic materials. Here, we have summarized all of the series of nitrogen-rich energetic salts. This review gives an overview of the various studies dealing with synthetic aspects and some of the physicochemical properties of ionic compounds that are based on ammonia, guanidine, semicarbazide, carbohydrazide, tetrazine, tetrazole, triazole and imidazole. In addition, their potential applications in the fields of explosives and propellants are discussed. We hope these investigations will be helpful in providing a wider insight for future research in the area of energetic salts.

Źródło:

Central European Journal of Energetic Materials; 2015, 12, 3; 417-437
1733-7178

Pojawia się w:

Central European Journal of Energetic Materials

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 49.

Tytuł:

Hydrazinium 5-Aminotetrazolate: an Insensitive Energetic Material Containing 83.72% Nitrogen

Autorzy:

Fischer, N.
Klapötke, T. M.
Scheutzow, S.
Stierstorfer, J.

Powiązania:

https://bibliotekanauki.pl/articles/358539.pdf

Data publikacji:

2008

Wydawca:

Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego

Tematy:

hydrazines
tetrazoles
crystal structure
energetic materials
sensitivities

Opis:

Hydrazinium 5-aminotetrazolate (2) was synthesized via two facile routes. Both the reaction of 5-amino-1H-tetrazole (1) with hydrazine hydrate in aqueous solution and the reaction of 1 with diluted hydrazine solution in THF yield 2 in excellent purities and yields. 2 was characterized comprehensively by X-ray diffraction, IR, Raman and multinuclear NMR spectroscopy, mass spectrometry, elemental analysis and differential scanning calorimetry. The heat of formation was calculated (CMS-4M) using the atomization method to be 373 kJ mol-1. With this value and the X-ray density several detonation parameter (heats of explosion, detonation pressure, detonation velocity, explosion temperature) were calculated with the EXPLO5 computer software. An incredible high value (9516 m s-1) was obtained for the detonation velocity. Therefore experimentally tests to determine the velocity of detonation were performed. In addition the use of 2 in solid propellant compositions was calculated and tested in combination with oxidizers, e.g. ammonium dinitramide. Lastly the sensitivities towards impact, friction and electrostatic discharge were determined with the BAM drophammer, friction tester and an ESD machine.

Źródło:

Central European Journal of Energetic Materials; 2008, 5, 3-4; 3-18
1733-7178

Pojawia się w:

Central European Journal of Energetic Materials

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 50.

Tytuł:

Position of Fe ions in MgO crystalline structure

Autorzy:

Szczerba, J.
Prorok, R.
Stoch, P.
Śnieżek, E.
Jastrzębska, I.

Powiązania:

https://bibliotekanauki.pl/articles/146372.pdf

Data publikacji:

2015

Wydawca:

Instytut Chemii i Techniki Jądrowej

Tematy:

Mössbauer spectroscopy
MgO
Fe ions
crystal structure

Opis:

Magnesium oxide (MgO) is one of the most important raw materials in many branches of industry. Magnesium oxide is a popular refractory raw material because of its high refractoriness and high resistance to basic slags and environment. In many cases, use of MgO is limited by its properties, especially the presence of secondary phases like iron oxides. The amount and distribution of iron oxides can strongly infl uence the technological properties of MgO and depend on the manufacturing method, particularly the heat-treatment process. The aim of the study was to evaluate the infl uence of the heat-treatment process on amount and distribution of iron ions in a magnesium oxide lattice. The 57Fe Mössbauer effect measurements of fused and sintered magnesium oxide samples doped by the iron oxide were conducted. Investigation reveals in both cases the presence of Fe2+ as well as Fe3+ ions. Fe2+ ions occupy Mg2+ octahedral sites in the MgO lattice, whereas the Fe3+ ions are located in highly distorted octahedral coordination. The amount of Fe2+ varies from around 66% for fused samples to 30% for sintered samples.

Źródło:

Nukleonika; 2015, 60, 1; 143-145
0029-5922
1508-5791

Pojawia się w:

Nukleonika

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 51.

Tytuł:

Film Music and the Crystal-Image in Krzysztof Zanussi’s The Structure of Crystal

Autorzy:

Boczkowska, Ewelina

Powiązania:

https://bibliotekanauki.pl/articles/1790957.pdf

Data publikacji:

2020-12-23

Wydawca:

Katolicki Uniwersytet Lubelski Jana Pawła II. Towarzystwo Naukowe KUL

Tematy:

Krzysztof Zanussi
Wojciech Kilar
Gilles Deleuze
obraz-kryształ
muzyka filmowa
Struktura kryształu
crystal-image
film music
The Structure of Crystal

Opis:

Muzyka filmowa i obraz-kryształ w Strukturze kryształu Krzysztofa Zanussiego Tematyka debiutanckiego filmu fabularnego Krzysztofa Zanussiego Struktura kryształu (1969) koncentruje się wokół dwóch naukowców o przeciwstawnych poglądach: jeden z nich charakteryzuje się integralnością etyczną, podczas gdy drugi kieruje się konformizmem. Polaryzacje te znajdują odzwierciedlenie w koncepcji obrazu-kryształu Gillesa Deleuze’a, którą wykorzystano w prezentowanym artykule w odniesieniu do ścieżki dźwiękowej Wojciecha Kilara. Autorka uzasadnia tezę o skomponowaniu muzyki tła w sposób umożliwiający przekształcanie płaszczyzny porozumienia między leżącymi u podstaw filmu antagonistycznymi światopoglądami, co ostatecznie prowadzi do ukazania ostrej krytyki społecznej rzeczywistości Polski po 1968 roku.
Krzysztof Zanussi’s 1969 debut feature film, The Structure of Crystal (Struktura kryształu), revolves around two scientists with opposing worldviews—one rooted in ethical integrity and the other driven by conformism. These polarities are reflected in Gilles Deleuze’s notion of the crystal-image, which I apply to Wojciech Kilar’s music for the film. I argue that Kilar’s underscoring continuously reshapes the grounds of understanding between the antagonistic worldviews at the film’s core, ultimately to deliver a powerful critique of the social reality of post-1968 Poland.

Źródło:

Roczniki Humanistyczne; 2020, 68, 12; 165-180
0035-7707

Pojawia się w:

Roczniki Humanistyczne

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 52.

Tytuł:

Narrow transmission mode in one-dimensional symmetric defective photonic crystal containing metamaterial and high Tc superconductor

Autorzy:

Srivastava, Sanjeev K.
Aghajamali, Alireza

Powiązania:

https://bibliotekanauki.pl/articles/173630.pdf

Data publikacji:

2019

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

photonic crystal
photonic band gap
transmission spectra
transmission mode
defect mode
metamaterial
negative index material
superconductor photonic crystal

Opis:

We theoretically investigate the properties of narrow transmission mode (defect mode) within the reflection band in one-dimensional symmetric defective photonic crystal containing double negative metamaterial and high temperature superconductors. The transmittance spectrum of the proposed structure is obtained by using the characteristic or transfer matrix method. The results show that by increasing the thickness of air defect, transmission mode shifts towards the lower frequency side. But when the thickness of a superconductor layer is increased, transmission mode shifts towards the high frequency side. Further, the effect of temperature variation of superconducting defect on the defect mode has been investigated and found that when the temperature of superconducting layer increases the frequency of defect mode is red shifted. The shift in frequency has smaller value in the lower temperature region than in the higher temperature region, even if the change in temperature is same. Finally we have discussed the effect of variation of thickness on the defect mode by using the double negative metamaterial as defect layer in place of superconductor layer. The result shows that we get two modes for smaller thickness of double negative layer but only a single mode for larger thickness.

Źródło:

Optica Applicata; 2019, 49, 1; 37-50
0078-5466
1899-7015

Pojawia się w:

Optica Applicata

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 53.

Tytuł:

Crystal structure and Mössbauer effect in multiferroic 0.5BiFeO3-0.5Pb(Fe0.5Ta0.5)O3 solid solution

Autorzy:

Stoch, A.
Maurin, J.
Stoch, P.
Kulawik, J.
Szwagierczak, D.

Powiązania:

https://bibliotekanauki.pl/articles/146870.pdf

Data publikacji:

2017

Wydawca:

Instytut Chemii i Techniki Jądrowej

Tematy:

BiFeO3
crystal structure
hyperfine interactions
multiferroics
solid solution

Opis:

Multiferroic 0.5BiFeO3-0.5Pb(Fe0.5Ta0.5)O3 solid solution is a material that exhibits ferroelectric and antiferromagnetic orderings in ambient temperature. The solid solution was obtained as a result of a conventional reaction in a solid state. The obtained material is a dense, fine-grained sinter whose surface was observed by scanning electron microscopy (SEM) and stoichiometry was confirmed by energy dispersive X-ray spectroscopic (EDS) analysis. According to the X-ray powder diffraction (XRD) measurements, the main phase is R3c space group with admixture of Pm-3m regular phase. Small contribution of pyrochlore-like phase was also observed. Mössbauer spectroscopy suggested random distribution of Fe3+/Ta5+ cations in the B sites of ABO3 compound. Reduction of the magnetic hyperfine field with an increase in the substitution of Ta5+ in Fe3+ neighbourhood was also observed.

Źródło:

Nukleonika; 2017, 62, 2; 177-181
0029-5922
1508-5791

Pojawia się w:

Nukleonika

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 54.

Tytuł:

Efektywna metoda rozpoznawania faz ciekłokrystalicznych
Effective method of identification of liquid crystal phases

Autorzy:

Orlikowska, H.
Bartiewicz, S.

Powiązania:

https://bibliotekanauki.pl/articles/271314.pdf

Data publikacji:

2016

Wydawca:

Centralny Ośrodek Badawczo-Rozwojowy Aparatury Badawczej i Dydaktycznej, COBRABiD

Tematy:

mezofaza
ciekły kryształ
tekstura
ImageJ
mesophase
liquid crystal
texture

Opis:

Ciekłe kryształy są szeroko badane ze względu na ich zastosowanie w wielu urządzeniach optycznych oraz jako składniki mieszanin chemicznych. Powszechnie stosowane są trzy metody identyfikacji faz ciekłokrystalicznych: obserwacja tekstur za pomocą mikroskopu polaryzacyjnego, dyfrakcja promieni rentgenowskich oraz termodynamiczna metoda współmieszalności. Wszystkie wymienione techniki mają jednak istotne ograniczenia. W tej pracy, po raz pierwszy, prezentujemy nową metodę identyfikacji mezofaz opartą na mikroskopii polaryzacyjnej – dynamiczną dwuwymiarową analizę termooptyczną (DDAT). Istota metody polega na statystycznej analizie obrazów mikroskopowych powstałych przy depolaryzacji światła przechodzącego przez medium ciekłokrystaliczne umieszczone w zmiennym polu elektrycznym. Opisana metoda jest efektywna i tania, co umożliwia zastosowanie jej zarówno w profesjonalnych badaniach, jak i w procesie dydaktycznym.
Liquid crystals are widely studied because of their application in many optical devices and as components of chemical mixtures. For identifying liquid crystalline phases three basic methods are used: polarizing microscope observations of optical texture, X-ray diffraction and miscibility method. All of these techniques have significant limitations. In this work, for the first time, we present a new method to identify mesophases based on polarization microscopy – dynamic two-dimensional thermooptical analysis (DTD TOA). The essence of the method is based on a statistical analysis of microscopic images resulting from the depolarization of the light passing through the liquid crystal medium disposed in the alternating electric field. The described method is effective and inexpensive, which makes it attractive for applications in both professional research and the teaching process.

Źródło:

Aparatura Badawcza i Dydaktyczna; 2016, 21, 3; 135-140
2392-1765

Pojawia się w:

Aparatura Badawcza i Dydaktyczna

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 55.

Tytuł:

The Effect of Layer Thickness on the Reflectance of a Quasi One-Dimensional Composite Built with Zr55Cu30Ni5Al10 Amorphous Alloy and Epoxy Resin

Autorzy:

Garus, Sebastian
Sochacki, Wojciech

Powiązania:

https://bibliotekanauki.pl/articles/2049717.pdf

Data publikacji:

2021

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

amorphous alloy
aperiodic multilayer
mechanical waves
phononic crystal
bandgap

Opis:

The study examined the impact of the angle of incidence of mechanical waves on various types of quasi one-dimensional superlattice. Binary periodic structure, quasi-periodic distribution of Thue-Morse layers and Severin’s aperiodic multilayer were used. Using the concatenation and recursive rules, the distribution of layers was determined for individual structure types for generation numbers equal to 3, 4 and 5. The structures were selected so that the thickness of the composite was the same for each type of distribution for a given generation number value. Transfer Matrix Method algorithm was used to determine reflectance. The band structure of reflectance has been demonstrated for incidence angles up to 90 degrees at mechanical wave frequencies up to 50 kHz. The existence of wide bands of high reflectance above the acoustic frequencies was demonstrated for the analyzed structures. Increasing the layer thickness caused an inhomogeneous shifts of transmission peaks towards lower frequencies.

Źródło:

Archives of Metallurgy and Materials; 2021, 66, 2; 503-510
1733-3490

Pojawia się w:

Archives of Metallurgy and Materials

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 56.

Tytuł:

Optimization of a Bandgap in the Ultrasonic Phononic Coating

Autorzy:

Garus, Sebastian
Sochacki, Wojciech
Garus, Justyna
Sandu, Andrei Victor

Powiązania:

https://bibliotekanauki.pl/articles/2049725.pdf

Data publikacji:

2021

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

reflectance coating
mechanical waves
phononic crystal
band gap
optimization

Opis:

This work concerns the study of the coatings for the ultrasound frequency range as a quasi one-dimensional phononic crystal structure protecting a sea object against high resolution active sonar in the frequency range most commonly found for this type of equipment. The topology of the examined structure was optimized to obtain a band gap in the 2.2-2.3 MHz frequency band. For this purpose, a genetic algorithm was used, which allows for optimal distribution of individual elements of the ultrasound multilayer composite. By optimal distribution is meant to achieve a structure that will allow minimal reflectance in a given frequency range without height reflectance peaks with a small half width. Analysis of the wave propagation was made using the Transfer Matrix Method (TMM). As part of the research, 15 and 20-layer structures with reflectance at the level of 0.23% and 0.18%, respectively, were obtained. increasing the number of layers in the analyzed structures resulted in finding such a distribution in which a narrow band of low reflectance was obtained, such distributions could also be used as bandpass filters. The use of a genetic algorithm for designing allows to obtain modern coatings, the characteristics of which result from the structure.

Źródło:

Archives of Metallurgy and Materials; 2021, 66, 2; 537-542
1733-3490

Pojawia się w:

Archives of Metallurgy and Materials

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 57.

Tytuł:

X-Ray Topography of the Subsurface Crystal Layers in the Skew Asymmetric Reflection Geometry

Autorzy:

Świątek, Z.
Fodchuk, I.

Powiązania:

https://bibliotekanauki.pl/articles/356405.pdf

Data publikacji:

2016

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

x-ray topography
subsurface crystal layers
asymmetric reflection geometry

Opis:

The technique of X ray topography with the asymmetric reflection geometry of X-ray diffraction presented in this paper as useful tool for structural characterization of materials, particularly, epitaxial thin films and semiconductor multi-layered crystal systems used for the optoelectronic devices. New possibilities of this technique for a layer-by-layer visualization of structural changes in the subsurface crystal layers are demonstrated for semiconductors after various types of surface treatment, such as chemical etching, laser irradiation and ion implantation.

Źródło:

Archives of Metallurgy and Materials; 2016, 61, 4; 1931-1938
1733-3490

Pojawia się w:

Archives of Metallurgy and Materials

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 58.

Tytuł:

Material symmetry: a key to specification of interatomic potentials

Autorzy:

Nalepka, K.

Powiązania:

https://bibliotekanauki.pl/articles/201282.pdf

Data publikacji:

2013

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

crystal symmetry
interatomic potentials
elasticity
phase transformations
stacking fault

Opis:

The paper shows that symmetry forms a basis for relations between different properties of material. In this way, the key quantities for specification of an atomistic model are identified. Material symmetry distinguishes representative processes of small strains. It is proved that the errors in the densities of the energies stored in these processes determine the range of inaccuracies with which an atomistic model recreates processes of small deformations. The errors are equal to the inaccuracies in the eigenvalues of the elasticity tensor, that is in the Kelvin moduli. For cubic crystals, the elementary processes indicated by the symmetry initiate the key paths of large deformations: Bain and trigonal ones. Therefore, the substantial errors in the Kelvin moduli lead to incorrect reconstructing the metastable phases: bcc, sc and bct. The elastic constants commonly used in the literature do not provide such information as the Kelvin moduli. Using the eigenvalues of the elasticity tensor as well as other key properties indicated by the symmetry, the EAM model proposed by A.F. Voter for copper is specified. The obtained potential more accurately reproduces small and large deformations and additionally, correctly describes defect formation as well as Cu dimer properties.

Źródło:

Bulletin of the Polish Academy of Sciences. Technical Sciences; 2013, 61, 2; 441-450
0239-7528

Pojawia się w:

Bulletin of the Polish Academy of Sciences. Technical Sciences

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 59.

Tytuł:

Controllable wavelength conversion based on soliton dynamics in mid-infrared fiber

Autorzy:

Shen, Kangle
Yang, Jian
Zhao, Jiayi
Yang, Xinyu
Yang, Hua

Powiązania:

https://bibliotekanauki.pl/articles/27310109.pdf

Data publikacji:

2023

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

soliton dynamics
photonic crystal fiber
all-optical conversion switches

Opis:

We provide a convenient way to actively control the wavelength conversion of probe waves based on the soliton dynamics in the As2S3 fibers. In this paper, it is found by numerical calculation that wavelength conversion occurs in the frequency domain due to the existence of refractive index barrier. By adjusting the collision position of pump pulse and probe pulse to realize the conversion of probe pulse wavelength, the effect of the power and the incident wavelength of the probe wave on the wavelength conversion are also discussed. This frequency domain conversion is of great use in the mid-infrared region, for example, all-optical conversion switches.

Źródło:

Optica Applicata; 2023, 53, 3; 419--429
0078-5466
1899-7015

Pojawia się w:

Optica Applicata

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 60.

Tytuł:

Astigmatic transformation of Bessel beams in a uniaxial crystal

Autorzy:

Khonina, S. N.
Paranin, V. D.
Ustinov, A. V.
Krasnov, A. P.

Powiązania:

https://bibliotekanauki.pl/articles/173240.pdf

Data publikacji:

2016

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

Bessel beams
axicon
astigmatic transformations
uniaxial crystal
polarization

Opis:

We investigate theoretically and experimentally the astigmatic transformations of Bessel beams at propagation perpendicularly to the c-axis of a uniaxial crystal. The analogy between this transformation and the astigmatic distortion of the plane wave by an inclined axicon is analytically shown. The influence of the polarization direction of radiation relative to the c-axis of a crystal on electric field components of the ordinary and the extraordinary beams is investigated.

Źródło:

Optica Applicata; 2016, 46, 1; 5-18
0078-5466
1899-7015

Pojawia się w:

Optica Applicata

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 61.

Tytuł:

Propagation properties of anomalous hollow vortex beam in uniaxial crystal orthogonal to the optical axis

Autorzy:

Liu, D.
Wang, Y.
Wang, G.

Powiązania:

https://bibliotekanauki.pl/articles/174466.pdf

Data publikacji:

2018

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

uniaxial crystal
anomalous hollow vortex beam
laser propagation

Opis:

The analytical equation of an anomalous hollow vortex beam propagating in a uniaxial crystal orthogonal to the optical axis is derived, and the intensity and phase properties of this beam propagating in the uniaxial crystal are illustrated using numerical examples. The influences of topological charge M and the ratio of refractive index n_e/n_o of a uniaxial crystal on the normalized intensity distribution and phase distribution for anomalous hollow vortex beam are discussed and analyzed in detail.

Źródło:

Optica Applicata; 2018, 48, 1; 95-104
0078-5466
1899-7015

Pojawia się w:

Optica Applicata

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 62.

Tytuł:

Modeling and optimization of the YAG:Yb microchip laser passively Q-switched by YAG:Cr absorber

Autorzy:

Buryy, O
Ubizskii, S

Powiązania:

https://bibliotekanauki.pl/articles/175041.pdf

Data publikacji:

2014

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

Yb:YAG crystal
microlaser
Q-switching
numerical simulation

Opis:

Based on analytical and numerical solutions of the rate equations system and the heat conductivity equation, the model of the quasi-three-level passively Q-switched YAG:Yb/YAG:Cr microchip laser is developed. The obtained results are used for its optimization, i.e., for the determination of the output mirror reflectivity, the pumping beam radius, the thickness of the absorber and the phototropic centers concentration maximizing the energy in the laser pulse. The influence of the thermal load on the spatial parameters of the laser beam is also determined.

Źródło:

Optica Applicata; 2014, 44, 4; 621-636
0078-5466
1899-7015

Pojawia się w:

Optica Applicata

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 63.

Tytuł:

An all optical majority gate using nonlinear photonic crystal based ring resonators

Autorzy:

Poursaleh, Amir
Andalib, Alireza

Powiązania:

https://bibliotekanauki.pl/articles/175120.pdf

Data publikacji:

2019

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

majority gate
photonic crystal
Kerr effect
ring resonator

Opis:

Optical logics will play a crucial role in the next generation all optical data processing networks. Therefore an all optical majority gate will be designed by using nonlinear photonic crystal ring resonators. For realizing the proposed structure we need three nonlinear resonant rings. In order to make nonlinear resonant rings, we used chalcogenide glass as the dielectric material for the dielectric rods. The output port of the proposed structure will be active only when two or three logic input ports are active. The rise and fall time values of the proposed structure are about 2 and 1 ps, respectively. The total footprint of the proposed structure is about 1287 μm².

Źródło:

Optica Applicata; 2019, 49, 3; 487-498
0078-5466
1899-7015

Pojawia się w:

Optica Applicata

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 64.

Tytuł:

Photonic crystal fibre characterisation with the method of lines

Autorzy:

Goncharenko, I.A.
Marciniak, M.

Powiązania:

https://bibliotekanauki.pl/articles/308198.pdf

Data publikacji:

2004

Wydawca:

Instytut Łączności - Państwowy Instytut Badawczy

Tematy:

optical crystal fibres
photonic bandgap
method of lines

Opis:

Photonic crystal fibres are longitudinally uniform fibres in which in lateral directions periodic refractive index changes occur. Two basically different light guiding mechanisms occur in crystal fibres: index guiding and bandgap guiding. In the paper different modelling methods have been evaluated when applied to photonic crystal fibres. In particular, the method of lines has been shown to be effective and reliable for both classes of photonic crystal fibres. High accuracy results for optical field distribution and dispersion characteristics in a photonic crystal fibre have been achieved with the method of lines.

Źródło:

Journal of Telecommunications and Information Technology; 2004, 1; 106-111
1509-4553
1899-8852

Pojawia się w:

Journal of Telecommunications and Information Technology

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 65.

Tytuł:

Research of microstructure of molybden doped weldings of oil and gas pipelines

Autorzy:

Pandova, Iveta
Rimar, Miroslav
Makarenko, Valery
Vinnikov, Yuri
Mangura, Andrey
Zaborowski, Tadeusz
Aloshyn, Valentyn

Powiązania:

https://bibliotekanauki.pl/articles/2037421.pdf

Data publikacji:

2021

Wydawca:

STE GROUP

Tematy:

structure
fracture
corrosion
crystal lattice
non–metallic inclusions

Opis:

Still existing scientific, technical and technological developments to improve the quality of welded joints of metal pipe structures contain contradictions and uncertainty about the effects of alloying elements, such as molybdenum, mechanical and visco-plastic properties, as well as metallographic component joints. All this indicates the need for a systematic study of these problems for the development of rational metallurgical and technological measures to significantly improve the technological and corrosion-mechanical properties of weld metal. Metallographic studies, using laboratory equipment with high identifying ability, found that the doping of weld metal with molybdenum in the amount of 0.2-0.4% causes fragmentation of ferrite-pearlite structure, including carbides Mn and Fe, and also reduces the number and size of non-metallic inclusions – sulfides, oxides and silicates. Moreover, non-metallic inclusions have a dispersed appearance, which promotes plasticization of the structure, which directly increases the viscous-plastic characteristics and resistance of the metal joints to crack formation. Based on the results of metallographic research, the optimum content in the weld metal of the alloyed element – molybdenum, which is 0.2-0.4%, is determined.

Źródło:

Management Systems in Production Engineering; 2021, 4 (29); 274-279
2299-0461

Pojawia się w:

Management Systems in Production Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 66.

Tytuł:

Problemy wzrostu monokryształów fosforku galu (GaP) o średnicy 4 i orientacji < 100 > oraz < 111 >
Difficulties in 4 gallium phosphide (GaP) single crystals growing in < 100 > or < 111 > direction

Autorzy:

Orłowski, W.
Mirowska, A.
Hruban, A.
Strzelecka, S.

Powiązania:

https://bibliotekanauki.pl/articles/192234.pdf

Data publikacji:

2010

Wydawca:

Sieć Badawcza Łukasiewicz - Instytut Technologii Materiałów Elektronicznych

Tematy:

GaP
monokrystalizacja
metoda LEC
crystal growth
LEG method

Opis:

Opracowano warunki otrzymywania monokryształów fosforku galu (GaP) o średnicy 4" i orientacji < 100 > oraz < 111 >. Skonstruowano układy termiczne dla urządzenia MarkIV, w których można otrzymywać metodą Czochralskiego z herme-tyzacją cieczową (LEC - Liąuid Encapsulated Czochralski) duże monokryształy GaP. Zbadano termiczne warunki wzrostu kryształów. Doświadczalnie określono wpływ niektórych elementów układu termicznego na kształt pola temperatur w obszarze wzrostu kryształów. Otrzymano monokryształy GaP o średnicy 4" i orientacji < 100 > oraz < 111 >. Zbadano ich własności elektryczne i strukturalne.
Technological parameters for growing 4"(GaP) single crystals in < 100 > and < 111 > direction were investigated. Thermal systems were constructed for MarklV puller, which allow growing GaP single crystals with big diameter by Liquid Encapsulated Czochralski method. The influence of some of the thermal system elements on the temperature field near the growing crystal was experimentally assessed. GaP crystals of 4" in diameter were obtained in < 100 > and < 111 > direction. Electrical and structural parameters were assessed.

Źródło:

Materiały Elektroniczne; 2010, T. 38, nr 2, 2; 9-19
0209-0058

Pojawia się w:

Materiały Elektroniczne

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 67.

Tytuł:

Symulacje odkształcania aluminium z wykorzystaniem modelu Crystal Plasticity
Simulations of aluminum deformation using Crystal Plasticity model

Autorzy:

Wajda, W.

Powiązania:

https://bibliotekanauki.pl/articles/211969.pdf

Data publikacji:

2013

Wydawca:

Sieć Badawcza Łukasiewicz - Instytut Obróbki Plastycznej

Tematy:

aluminium
odkształcenie
tekstura
crystal plasticity
aluminum
deformation
texture

Opis:

W artykule przedstawiono problem symulacji zachowania się materiału podczas przeróbki plastycznej z wykorzystaniem Metody Elementów Skończonych (MES). W odróżnieniu od konwencjonalnej symulacji MES do opisu zachowania się materiału wykorzystano model Crystal Plasticity (CP). Główną zaletą tego modelu jest możliwość jednoczesnego opisu umocnienia materiału oraz rozwoju tekstury podczas deformacji. Model ten jednak wymaga identyfikacji parametrów, które nie są powszechnie dostępne w literaturze. W przedstawionej pracy do identyfikacji parametrów wykorzystano metodę odwrotną. Zidentyfikowano parametry modelu dla monokryształów aluminium, a następnie zastosowano je do symulacji odkształcana polikrystalicznego aluminium. Otrzymane wyniki są zgodne z wynikami doświadczalnymi odkształcania polikrystalicznego aluminium.
The paper focused on the problem of simulation of material behaviour during forming process. The simulation is carried out by Finite Element Method (FEM). In contrary to conventional FEM simulation to describe material behaviour Crystal Plasticity (CP) model was used. Main advantage of the model is possibility of simultaneous description of material hardening and texture development during deformation. Nevertheless, the model usage requires its parameters identification, which are not commonly available in literature. In this work inverse method was used to identify the models parameters. First, the parameters were identified for aluminum single crystal, subsequently they were used for simulation of polycrystalline aluminum behaviour during deformation. Obtained results are in good agreement with those commonly observed in polycrystalline aluminum deformation experiments

Źródło:

Obróbka Plastyczna Metali; 2013, 24, 4; 243-251
0867-2628

Pojawia się w:

Obróbka Plastyczna Metali

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 68.

Tytuł:

Eutectic Structures Competition in the Stripes Strengthening the (Zn) – Single Crystal

Autorzy:

Wołczyński, W.
Kjelstrup, S.
Bedeaux, D.
Szajnar, J.
Billia, B.

Powiązania:

https://bibliotekanauki.pl/articles/380972.pdf

Data publikacji:

2014

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

eutectic structure selection
Zn
single crystal
branching phenomenon

Opis:

Some eutectic stripes have been generated in a hexagonal (Zn) - single crystal. The stripes are situated periodically with the constant inter stripes spacing. The eutectic structure in the stripes consists of strengthening inter-metallic compound, Zn16Ti, and (Zn) – solid solution. The rod-like irregular eutectic structure (with branches) appears at low growth rates. The regular lamellar eutectic structure is observed at middle growth rates. The regular rod-like eutectic structure exists exclusively in the stripes at some elevated growth rates. A new thermodynamic criterion is recommended. It suggests that this eutectic regular structure is the winner in a morphological competition for which the minimum entropy production is lower. A competition between the regular rod-like and the regular lamellar eutectic growth is described by means of the proposed criterion. The formation of branches within irregular eutectic structure is referred to the state of marginal stability. A continuous transitions from the marginal stability to the stationary state are confirmed by the continuous transformations of the irregular eutectic structure into the regular one.

Źródło:

Archives of Foundry Engineering; 2014, 14, 4; 95-102
1897-3310
2299-2944

Pojawia się w:

Archives of Foundry Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 69.

Tytuł:

Crystal structures and conformers of CyMe4-BTBP

Autorzy:

Lyczko, K.
Ostrowski, S.

Powiązania:

https://bibliotekanauki.pl/articles/147806.pdf

Data publikacji:

2015

Wydawca:

Instytut Chemii i Techniki Jądrowej

Tematy:

conformers
crystal structure
CyMe4-BTBP
DFT calculations

Opis:

The crystal structure of new conformation of the CyMe4-BTBP ligand (ttc) has been presented. The ttt conformer of this compound in a form of THF solvate has been also crystallized. The geometries of six possible conformations (ttt, ttc, tct, tcc, ctc and ccc) of the CyMe4-BTBP ligand have been modeled in the gas phase and in solutions (MeOH and H2O) by DFT calculations using B3LYP/6-31G(d,p) method. According to the calculations, in the three different media the conformers with trans orientation of the N atoms in the bipyridyl moiety are the most stable.

Źródło:

Nukleonika; 2015, 60, No. 4, part 2; 853-857
0029-5922
1508-5791

Pojawia się w:

Nukleonika

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 70.

Tytuł:

Crystal structures of ErGe2 and TmGe2 compounds

Autorzy:

Matvijishyn, R.
Pavlyuk, V.
Shpyrka, Z.
Serkiz, R.

Powiązania:

https://bibliotekanauki.pl/articles/410283.pdf

Data publikacji:

2010

Wydawca:

Uniwersytet Humanistyczno-Przyrodniczy im. Jana Długosza w Częstochowie. Wydawnictwo Uczelniane

Tematy:

rare earths phases
crystal structure
X-ray diffraction

Opis:

Crystal structures of ErGe2 and TmGe2 compounds were determined by X-ray single crystal diffraction. Both TmGe2 and ErGe2 crystallized with the ZrSi2 structure type (space group Cmcm).

Źródło:

Chemistry, Environment, Biotechnology; 2010, 14; 35-40
2083-7097

Pojawia się w:

Chemistry, Environment, Biotechnology

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 71.

Tytuł:

Synthesis of carrageenan/multi-walled carbon nanotube hybrid hydrogel nanocomposite for adsorption of crystal violet from aqueous solution

Autorzy:

Hosseinzadeh, H.

Powiązania:

https://bibliotekanauki.pl/articles/780038.pdf

Data publikacji:

2015

Wydawca:

Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie

Tematy:

carrageenan
hydrogel
nanocomposite
carbon nanotube
adsorption
crystal violet

Opis:

A novel polysaccharide-based hydrogel nanocomposite was prepared using grafting of acrylic acid (AA) on to kappa-carrageenan (κC) by incorporating multi-walled carbon nanotube (MCNT). In fact, MCNTs were used as nano-sized reinforcements in the synthesized nanocomposite. Spectroscopy together with morphology proved relatively strong κC-MCNT interaction. Besides, the swelling behavior of the nanocomposite hydrogel was studied. The results showed that in the presence of MCNTs, the equilibrium swelling capacity was decreased. This can be attributed to cross-linking role and hydrophilicity nature of MCNTs. The adsorption performance of hydrogel nanocomposite was also investigated for the removal of crystal violet (CV) as a cationic dye. The effects of some important parameters such as MCNT concentration, pH and contact time on the uptake of CV solution were studied. Equilibrium adsorption isotherm data of the hydrogel exhibited better fit to the Langmuir than to the Freundlich isotherm model. According to this model, the maximum adsorption capacity of κC-based hydrogel nanocomposite was found to be 118 mg . g^–1.

Źródło:

Polish Journal of Chemical Technology; 2015, 17, 2; 70-76
1509-8117
1899-4741

Pojawia się w:

Polish Journal of Chemical Technology

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 72.

Tytuł:

A Honeycomb Based Graded Metamaterial Muffler with Broadband Sound Attenuation and Load Bearing Performances

Autorzy:

Li, Gen
Chen, Yan
He, Huan

Powiązania:

https://bibliotekanauki.pl/articles/2141654.pdf

Data publikacji:

2022

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

acoustic metamaterials
honeycomb structure
phononic crystal
local resonance

Opis:

A challenge for developing acoustic metamaterials (AMMs) is considering the application of broadband muffling and load bearing capacity simultaneously. In this paper, a honeycomb based graded AMM muffler is proposed, which can widen the attenuation band and improve the structural stiffness without any external device by means of integrated design. Firstly, the acoustic and mechanical characteristics of the muffler unit cell are theoretically and numerically studied, and the graded muffler is designed based on these characteristics. The numerical results show that the graded muffler widens the attenuation bandwidth of the unit cell, and the simulation also shows that the graded muffler has greater stiffness than the uniform one. The stiffness driven muffler provides new possibilities for the design of advanced metamaterial with simultaneous sound insulation and load bearing performances.

Źródło:

Archives of Acoustics; 2022, 47, 2; 213-221
0137-5075

Pojawia się w:

Archives of Acoustics

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 73.

Tytuł:

Improvement of Sound Insulation Through Double-Panel Structure by Using Hybrid Local Resonator Array

Autorzy:

Ri, Kyong-Su
Kim, Myong-Jin
Son-U, Se-Hyon

Powiązania:

https://bibliotekanauki.pl/articles/31339917.pdf

Data publikacji:

2023

Wydawca:

Polska Akademia Nauk. Czasopisma i Monografie PAN

Tematy:

sound insulation
local resonance
insertion loss
sonic crystal

Opis:

In this paper, we present one approach to improve the soundproofing performance of the double-panel structure (DPS) in the entire audible frequencies, in which two kinds of local resonances, the breathing-type resonance and the Helmholtz resonance, are combined. The thin ring resonator row and slit-type resonator (Helmholtz resonator) row are inserted between two panels of DPS together. Overlapping of the band gaps due to the individual resonances gives a wide and high band gap of sound transmission in the low frequency range. At the same time, the Bragg-type band gap is created by the structural periodicity of the scatterers in the high audible frequency range. In addition, the number of scatterer rows and the filling factor are investigated with regard to the sound insulation of DPS with sonic crystals (SCs). Consequently, the hybrid SC has the potential of increasing the soundproofing performance of DPS in the audible frequency range above 1 kHz by about 15 dB on average compared to DPS filled only with glass wool between two panels, while decreasing the total thickness and mass compared to the counterparts with the other type of local resonant sonic crystal.

Źródło:

Archives of Acoustics; 2023, 48, 1; 63-70
0137-5075

Pojawia się w:

Archives of Acoustics

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 74.

Tytuł:

Wzrost monokryształów antymonku galu w kierunku <111> oraz <100> metodą Czochralskiego
Growth of gallium antimonide single crystals in and directions by Czochralski method

Autorzy:

Mirowska, A.
Orłowski, W.
Bańkowska, A.
Hruban, A.

Powiązania:

https://bibliotekanauki.pl/articles/192038.pdf

Data publikacji:

2009

Wydawca:

Sieć Badawcza Łukasiewicz - Instytut Technologii Materiałów Elektronicznych

Tematy:

GaSb
monokrystalizacja
domieszkowanie
własności elektryczne
crystal growth
doping electrical properties

Opis:

Do otrzymywania monokryształów antymonku galu o orientacji <111> oraz <100> zastosowana została zintegrowana z syntezą in-situ zmodyfikowana metoda Czochralskiego. Zbadano wpływ parametrów technologicznych procesu wzrostu na własności elektryczne niedomieszkowanych monokryształów GaSb. Uzyskano niedomieszkowane monokryształy GaSb typu p o koncentracji dziur w zakresie 1 ÷ 2 x 10^17 cm -³ i ruchliwości 600 ÷ 700 cm²/Vs (w 300 K). Przeprowadzono również próby domieszkowania na typ n oraz typ p. Zbadano wpływ koncentracji domieszki (Te, Si), jak też sposobu jej wprowadzania (Si), na własności elektryczne otrzymanych kryształów.
The aim of this work was to find out technological conditions for growing undoped gallium antimonide (GaSb) single crystals in <111> and <100> direction. Integrated process of in-situ synthesis and modified Czochralski crystal growth has been applied. The influence of charge material purity as well as other technological parameters on electrical properties of GaSb crystals was investigated. Undoped gallium antimonide single crystals were obtained with carrier concentration in the range 1 ÷ 2xl0^17 cm -³ and carrier mobility 600 ÷ 700 cm²Vs. First attempts of doping GaSb were made. The influence of doping (the way of doping and dopant quantity) on crystal parameters was also investigated.

Źródło:

Materiały Elektroniczne; 2009, T. 37, nr 2, 2; 3-15
0209-0058

Pojawia się w:

Materiały Elektroniczne

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 75.

Tytuł:

Friction Sensitivity of the ε-CL-20 Crystals Obtained in Precipitation Process

Autorzy:

Szczygielska, J.
Chlebna, S.
Maksimowski, P.
Skupiński, W.

Powiązania:

https://bibliotekanauki.pl/articles/358476.pdf

Data publikacji:

2011

Wydawca:

Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego

Tematy:

CL-20
crystallization
friction sensitivity
shape and size of crystal

Opis:

The purpose of this work was to obtain samples of CL-20 by precipitation process in a solvent/nonsolvent system, under variable process parameters such as: antisolvent kind, time of nonsolvent addition, stirrer speed, mass of seeded crystals of ε-CL-20. Received samples were studied in the aspect of their sensitivity to friction. As the results of the crystallization processes were prepared crystals of different sizes and shapes depend on applied parameters. It was affirmed, that applied antisolvent has essential influence on type of received crystals. CL-20 crystals of cuboid shape and sizes of 80-200 μm were obtained by recrystallization from ethyl acetate/chloroform. As the result of the recrystallization from ethyl acetate/xylene crystals with rounded edges were obtained. Crystals, from both samples, were mostly single and showed the lowest sensitivity to friction. Also, the crystals of irregular shape and sharp-edged agglomerates were obtained from systems with n-heptane, isooctane, cyclohexane and toluene, which revealed the highest friction sensitivities.

Źródło:

Central European Journal of Energetic Materials; 2011, 8, 2; 117-130
1733-7178

Pojawia się w:

Central European Journal of Energetic Materials

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 76.

Tytuł:

Points to ponder in the study of cadmium iodide

Autorzy:

Kaur, H.

Powiązania:

https://bibliotekanauki.pl/articles/411728.pdf

Data publikacji:

2014

Wydawca:

Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN

Tematy:

cadmium iodide
lead iodide
polytypism
phase transformations
Inorganic crystal structure

Opis:

During the growth of cadmium iodide crystals from solution, it has been observed that sometimes the crystal suddenly rotates. Probably, the convection currents are providing the force for the rotation. Mathematically, this force can be estimated and it must be greater than the van-der Walls force acting between adjacent sandwiches of cadmium iodide and can give rise to polytypic phase transformations. Further, studies of vacancies and the density measurements of various polytypes can help in understanding the phenomenon of polytypism better.

Źródło:

International Letters of Chemistry, Physics and Astronomy; 2014, 8; 1-5
2299-3843

Pojawia się w:

International Letters of Chemistry, Physics and Astronomy

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 77.

Tytuł:

Microhardness analysis of halite from different salt-bearing formations

Autorzy:

Toboła, Tomasz Tadeusz
Cyran, Katarzyna
Rembiś, Marek

Powiązania:

https://bibliotekanauki.pl/articles/2058643.pdf

Data publikacji:

2019

Wydawca:

Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy

Tematy:

microhardness
halite
salt formation
crystal defects
dislocations
shape of imprins

Opis:

Microhardness tests were carried out on single halite crystals. They were conducted on the (001) surface, with the indenter set in two directions: parallel to the halite face (010); and parallel to the (110) face. The halite crystals represent salt formations of different ages (Devonian, Zechstein, Badenian), depths (from 1835.5 to 195 m) and intensities of tectonic disturbance (horizontally stratified, salt dome, strongly folded). The measurement results revealed specific features of the halite crystals analysed. Firstly, the data obtained show microhardness anisotropy in halite crystals. Moreover, microhardness correlates with the depth of the salt-bearing formations. Halite crystals from deeper levels showed higher microhardness, though there was no correlation between the intensity of tectonic deformation and the average Vickers hardness (HV). The samples analysed show a variability of HV values and and of the shapes of imprints. These indicate zones where halite crystals are deformed at the atomic level and reflects the presence of defects in the crystal lattice. Such deformation is reflected in an irregularity of the strike of cleavage planes. Consequently, the analysis of imprint shapes is a useful method for the examination of ductile minerals and materials.

Źródło:

Geological Quarterly; 2019, 63, 4; 771--785
1641-7291

Pojawia się w:

Geological Quarterly

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 78.

Tytuł:

Four channel optical demultiplexer based on L2 photonic crystal microcavity

Autorzy:

Ammari, Merzoug
Benmerkhi, Ahlem
Bouchemat, Mohamed

Powiązania:

https://bibliotekanauki.pl/articles/2172853.pdf

Data publikacji:

2022

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

photonic crystal
cavity
waveguide
quality factor
demultiplexer
FDTD
filter
crosstalk

Opis:

The wavelength demultiplexing is a particularly important function in integrated optics and can be realized using photonic crystals. The aim is to extract accurately the wavelengths in a data flux. In this work, we investigate a new topologies of wavelength demultiplexing based on two-dimensional photonic crystals constituted of dielectric rods spread in a square network. The studied demultiplexer is based on optical filters with optimized parameters in order to extract four different wavelengths in the vicinity of frequencies corresponding to communication windows. It was found that the crosstalk between the structure channels of the demultiplexer are in the range of –19.19 and – 44.1 dB and the channel spacing is equal to 0.96 nm. The simulation results presented in this paper are performed and analyzed using the FDTD method.

Źródło:

Optica Applicata; 2022, 52, 4; 613--625
0078-5466
1899-7015

Pojawia się w:

Optica Applicata

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 79.

Tytuł:

Designing ultra-fast all-optical full-subtractor using the photonic crystal structure

Autorzy:

Pakrai, Forogh
Soroosh, Mohammad
Ganji, Jabbar

Powiązania:

https://bibliotekanauki.pl/articles/2202769.pdf

Data publikacji:

2023

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

full subtractor
nonlinear ring resonator
optical Kerr effect
photonic crystal

Opis:

In this paper, a photonic crystal-based structure for an all-optical full-subtractor has been proposed. The structure includes six nonlinear resonant rings to transmit the incoming optical waves toward the output ports. Using the different radii for nonlinear rods made the possibility of the dropping operation for different amounts of optical intensities. The nonlinear rods are made of a doped-glass with an optical Kerr coefficient of 10–15 m2/W. To calculate the components of the optical waves throughout the structure, the finite-difference time-domain method has been used. The simulation results prove the correct functionality of the proposed structure. Besides, the maximum rise time of the device is equal to 2 ps. The contrast ratio and the area of the structure are around 8.08 dB and 2790 μm2, respectively.

Źródło:

Optica Applicata; 2023, 53, 1; 99--109
0078-5466
1899-7015

Pojawia się w:

Optica Applicata

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 80.

Tytuł:

Calcium oxalate crystals in some Philodendron Schott (Araceae) species

Autorzy:

Klimko, M.
Wawrzynska, M.
Wiland-Szymanska, J.

Powiązania:

https://bibliotekanauki.pl/articles/790700.pdf

Data publikacji:

2016

Wydawca:

Uniwersytet Przyrodniczy w Poznaniu

Tematy:

Philodendron
calcium oxalate crystal
locality
petiole
lamina
Meconostigma
Pteromischum
Araceae

Opis:

The type and distribution (locations) of calcium oxalate crystals in mature leaves of 19 taxa of Philodendron (subgenera Meconostigma, Pteromischum and Philodendron) were studied. The calcium oxalate crystals were mainly found in the form of raphides, druses, styloids and prisms. The leaves of Philodendron demonstrate the presence of five distinctive raphide crystal types (biforine, thin-walled spindle-shaped, wide cells containing a wide raphide bundle, bundles of obliquely overlapping crystal and unmodified cells with either a single crystal needle or their cluster). Styloids and druses were found in all taxa at varying frequencies. Simple prisms and variations in crystal forms were most frequently observed in the ground tissue in petioles and midribs. This study represents additional data concerning calcium oxalate crystals in Philodendron.

Źródło:

Steciana; 2016, 20, 3
1689-653X

Pojawia się w:

Steciana

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 81.

Tytuł:

Pre-Treatment Characteristics for LCD Glass Recycling: Dismantling, Crushing, and Separation

Autorzy:

Kim, Seyul
Kang, Yubin
Kang, Leeseung
Hong, Hyun Seon
Lee, Chan Gi

Powiązania:

https://bibliotekanauki.pl/articles/351011.pdf

Data publikacji:

2019

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

waste LCD
LCD panel
waste glass
recycling
liquid crystal display

Opis:

A liquid crystal display (LCD) recycling process is needed to increase its efficiency by recovering the resources in addition to metals and plastics. This study investigates the pre-treatment process for recycling LCD glass. Recycling pre-treatment includes dismantling the LCD from the waste product, crushing the glass, and separating the glass particles from the impurities. Scanning electron microscopy confirmed that the oscillation milling process is more effective in maintaining uniform powder shape and size as compared to the cut milling process. The glass particles crushed by the oscillating mill, optimized at 1500 rpm, had a uniformly distributed particle size of less than 10 μm. These small particles were separated from the organic impurities, achieving a 98% pure powder that can be used as recycled raw materials. The proposed pre-treatment process for recycling LCD glass will enhance the ability to use waste glass as a valuable resource in the manufacturing of future displays.

Źródło:

Archives of Metallurgy and Materials; 2019, 64, 3; 829-834
1733-3490

Pojawia się w:

Archives of Metallurgy and Materials

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 82.

Tytuł:

Single air-mode resonance photonic crystal nanofiber cavity for ultra-high sensitivity refractive index sensing

Autorzy:

Zhang, Yanni
Yang, Jiaxi
Song, Meiqi
Zhang, Xuan
Yang, Daquan

Powiązania:

https://bibliotekanauki.pl/articles/173916.pdf

Data publikacji:

2020

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

photonic crystal nanocavity
air mode nanofiber
refractive index sensor
sensitivity

Opis:

We propose a design of series-connected one-dimensional photonic crystal nanofiber cavity sensor (1-D PC-NCS) and one-dimensional photonic crystal nanofiber bandgap filter (1-D PC-NBF). The proposed structure can get a single air mode for refractive index sensing with its extinction ratio of 58.64 dB. It filters out the high order mode and reduces the interaction between signals. By 3D FDTD, the calculated sensitivity is 848.18 nm/RIU (RIU – refractive index unit). Compared with general silicon on-chip nanobeam cavity, the sensitivity is increased by eight times. The additional 1-D PC-NBF will not change the sensitivity and the position of the resonance wavelength. Therefore, the new design we propose addresses the issue of crosstalk, and can be applied to ultra-high sensitivity index-based gas sensing and biosensing without the need for complicated coupling systems.

Źródło:

Optica Applicata; 2020, 50, 2; 199-207
0078-5466
1899-7015

Pojawia się w:

Optica Applicata

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 83.

Tytuł:

Optical self-phase modulation using a new photonic crystal coupled-cavity waveguide

Autorzy:

Bahadori-Haghighi, S
Ghayour, R

Powiązania:

https://bibliotekanauki.pl/articles/173977.pdf

Data publikacji:

2014

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

photonic crystal
slow light
coupled-cavity waveguide
self-phase modulation

Opis:

In this paper, self-phase modulation of an optical pulse using a new photonic crystal coupled-cavity waveguide is simulated and analyzed. The structure of the new coupled-cavity waveguide is introduced and its advantage over the previous type of coupled-cavity waveguide is discussed. In order to obtain a high group index over a large bandwidth and benefit from the slow light phenomenon, the group index and group velocity dispersion parameter curves of the guided mode are calculated. Finally, the transient simulation of the structure is performed using a finite-difference time-domain method. The calculated required length of the coupled-cavity waveguide for a maximum phase shift of π is about 31 μm. Spectral broadening of the optical pulse as a result of self-phase modulation is also presented and discussed.

Źródło:

Optica Applicata; 2014, 44, 1; 29-38
0078-5466
1899-7015

Pojawia się w:

Optica Applicata

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 84.

Tytuł:

All optical binary ASK demodulator using photonic crystal based nonlinear ring resonator

Autorzy:

Narimanzadeh, Mahsa
Andalib, Alireza

Powiązania:

https://bibliotekanauki.pl/articles/174652.pdf

Data publikacji:

2020

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

photonic crystal
amplitude shift keying
ASK
optical demodulator
delay time

Opis:

In this paper we will propose and design an all optical amplitude shift keying demodulator using a photonic crystal based nonlinear ring resonator. The proposed structure will be designed such that it can generate digital 0 and 1 based on the amplitude of the input signal. The working mechanism is based on controlling the optical behavior of the resonant ring using optical intensity. The proposed structure was simulated using plane wave expansion and finite difference time domain methods. The simulation results show that the rise and fall times for the proposed structure are 0.5 and 0.1 ps, respectively.

Źródło:

Optica Applicata; 2020, 50, 1; 61-68
0078-5466
1899-7015

Pojawia się w:

Optica Applicata

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 85.

Tytuł:

Propagation characteristics of longitudinal-torsion coupled waves in phononic crystal rods of chiral materials

Autorzy:

Dai, P.
Wang, R.

Powiązania:

https://bibliotekanauki.pl/articles/38697111.pdf

Data publikacji:

2023

Wydawca:

Instytut Podstawowych Problemów Techniki PAN

Tematy:

chiral material
band gap
phononic crystal rods
longitudinal-torsion waves

Opis:

The chiral properties of chiral materials have a great influence on the wave propagation. Applying chiral materials to the design of phononic crystal rods not only increases the design space, but also may have other potential advantages. There is a lack of research on designing phononic crystal rods using chiral materials and the propagation characteristics of elastic waves in phononic crystal rods made of chiral materials. In this study, chiral materials are introduced into the design of phonon crystal rods for the first time, Bragg scattering type and local resonance type phononic crystal rods are designed using chiral materials. Dispersion equations for the propagation of longitudinal-torsion coupled waves in the phononic crystal rods are derived, and the effect of the chirality of the materials on their bandgap range is studied. The study shows that: in Bragg scattering type phonon crystal rods, material chirality can greatly affect the bandgap, among them, the chiral direction has the greatest effect, and in order to obtain a low-frequency wide bandgap, the chiral coefficients of the materials should be increased as much as possible with the chiral directions of the two cells being opposite; in the local resonance type phonon crystal rod, only two types of oscillators are added to the material simultaneously to produce a band gap, and the starting frequency obtained is much lower than that of the Bragg scattering type.

Źródło:

Archives of Mechanics; 2023, 75, 5; 543-558
0373-2029

Pojawia się w:

Archives of Mechanics

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 86.

Tytuł:

Optical properties of Nd:YbVO4 crystal

Autorzy:

Liu, F Q
Sun, S Q
Gao, C Y
Xu, J Q

Powiązania:

https://bibliotekanauki.pl/articles/174689.pdf

Data publikacji:

2015

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

Nd
YbVO4 crystal
Judd-Ofelt theory
energy transfer

Opis:

Optical characteristics of a new laser crystal Nd:YbVO4 were studied. The optical parameters of a-cut and c-cut Nd:YbVO4 crystals were calculated by the Judd–Ofelt theory. The absorption crosssection of a-cut Nd:YbVO4 crystal was 5.34×10–20 cm2 at 808 nm, while it was 4.20×10–18 cm2 of c-cut Nd:YbVO4 crystal. The properties of energy transfer between Nd and Yb ions in Nd:YbVO4 crystal were discussed. In the fluorescence spectra, a peak at 472 nm appeared, which resulted from the coupling interaction between two Yb ions.

Źródło:

Optica Applicata; 2015, 45, 1; 63-70
0078-5466
1899-7015

Pojawia się w:

Optica Applicata

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 87.

Tytuł:

Gemstones from the ducal part of the fortified settlement of Poznań (10th/11th century) in the light of gemological studies and micro-Raman spectroscopy

Autorzy:

Sachanbiński, Michał
Kóčka-Krenz, Hanna
Skoczylas, Janusz
Girulski, Robert

Powiązania:

https://bibliotekanauki.pl/articles/1038457.pdf

Data publikacji:

2014-01-01

Wydawca:

Uniwersytet im. Adama Mickiewicza w Poznaniu

Tematy:

rock crystal
garnet
early medieval artifacts
micro-Raman spectroscopy

Opis:

During archaeological excavations in Poznań there were discovered a ducal palace, a chapel dated to the 10th century, and goldsmith’s workshop adjacent to them. In the layer of ashes at the bottom of the manufacture, there were fragments of gold found together with numerous glass beads and gems. Fourteen gems, made of rock crystal, agate, carnelian, milky chalcedony, garnet, were chosen for gemstone analysis and micro-Raman spectroscopy. The study material is dominated by beads (12 samples, of which six is faceted and six globular), while two pyrope samples have the cabochon cut. It should be emphasized that the rock crystal gems in the collection are usually heptagonal. Majority of the Poznań collection is of high quality, which is a sign of an advanced grinding and faceting technology. Pyrope from the Poznań collection contains inclusions of apatite, rutile, quartz, and magnetite, identified with micro-Raman spectroscopy. A similar combination of inclusions was recognized in pyrope from deposits in Vestřev near Turnov (Bohemia), and hence it indicates that the artifacts from Poznań were made of the pyrope from those deposits. Considering inclusions in rock crystal artifacts from the Poznań collection it was assumed that the mineral was also of the Bohemian origin.

Źródło:

Slavia Antiqua: rocznik poświęcony starożytnościom słowiańskim; 2014, 55; 145-169
0080-9993

Pojawia się w:

Slavia Antiqua: rocznik poświęcony starożytnościom słowiańskim

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 88.

Tytuł:

Dielectric relaxation modes in liquid crystalline mixture
Procesy relaksacji dielektrycznych w ciekłokrystalicznej mieszaninie

Autorzy:

Wojciechowski, M.

Powiązania:

https://bibliotekanauki.pl/articles/296496.pdf

Data publikacji:

2009

Wydawca:

Politechnika Łódzka. Wydawnictwo Politechniki Łódzkiej

Tematy:

faza ferrielektryczna
mieszanina ciekłokrystaliczna
ferrielectric phase
liquid crystal mixture

Opis:

Mixture of two liquid crystalline compounds (which do not exhibit antiferroelectric or ferrielectric phase separately) shows ferrielectric phase in a broad temperature range. The dielectric spectroscopy technique was used for investigation of collective molecular motions in the mixture. Two relaxation modes were detected in the ferrielectric phase and the soft mode in the SmA phase. The temperature dependence of the parameters of the dielectric relaxation modes are presented and discussed.
W pracy przedstawiono dielektryczne charakterystyki ostatnio zsyntetyzowanej ciekłokrystalicznej mieszaniny, w której faza ferrielektryczna występuje w szerokim przedziale temperatur. Badania dielektryczne przeprowadzono w komórce o złotych elektrodach i uporządkowaniu planarnym. Otrzymano temperaturowe zależności inkrementu dielektrycznego i częstości relaksacji występujących procesów relaksacyjnych w poszczególnych fazach. W fazie ferrielektrycznej w niższych temperaturach zarejestrowano, oprócz ferielektrycznego Goldstone modu występującego w całym przedziale występowania fazy ferroelektrycznej, dodatkowo proces relaksacyjny w obszarze częstości 0.2-0.8 kHz. Proces ten jest analogiczny do zaobserwowanych procesów przez Bourneya związanych z widocznymi liniami dysklinacyjnymi na powierzchni ciekłego kryształu.

Źródło:

Scientific Bulletin. Physics / Technical University of Łódź; 2009, 30; 85-95
1505-1013
2449-982X

Pojawia się w:

Scientific Bulletin. Physics / Technical University of Łódź

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 89.

Tytuł:

Preparation and Characterization of Desensitized ?-HNIW in Solvent-Antisolvent Recrystallizations

Autorzy:

Jiang, X.
Guo, X.
Ren, H.
Jiao, Q.

Powiązania:

https://bibliotekanauki.pl/articles/358201.pdf

Data publikacji:

2012

Wydawca:

Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego

Tematy:

ε -HNIW
supersaturation
crystal morphology
thermal decomposition
reduced sensitivity

Opis:

The solubility of hexanitrohexaazaisowurtzitane (HNIW) in solvent and solvent-antisolvent mixtures, and the temperature at which the HNIW's polymorph transforms were studied. The solubility of HNIW in solvent-antisolvent mixtures was measured at 30 C and these data were fitted to a generalized solubility curve. Recrystallization experiments were conducted at 30 C in the case of saturation with the volume ratio of ethyl acetate to petroleum ether (chloroform) ranging from 0:1 to 4:1. Desensitized HNIW was obtained by ethyl acetate and petroleum ether crystallization and characterized by Fourier Transform Infrared Spectroscopy (FTIR), X-ray Diffraction (XRD), High Performance Liquid Chromatography (HPLC) and Scanning Electron Microscopy (SEM). The FTIR and XRD spectra confirmed the structural features of ε-HNIW. The blocklike ε-HNIW grains had an average particle size of 160 ?m and high purity (98.52%). The decomposition of ε-HNIW was observed in the temperature range of 225-246 C by Differential Scanning Calorimetry (DSC). Furthermore, the impact and friction sensitivity tests suggested that the desensitized ε-HNIW was less sensitive than raw HNIW. Small scale gap tests with desensitized ε-HNIW showed that these crystals are less sensitive to shock initiation.

Źródło:

Central European Journal of Energetic Materials; 2012, 9, 3; 219-236
1733-7178

Pojawia się w:

Central European Journal of Energetic Materials

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 90.

Tytuł:

Reflected and transmitted powers of electromagnetic waves through a ferrite-dielectric photonic crystal

Autorzy:

Ubeid, M. F.
Shabat, M. M.

Powiązania:

https://bibliotekanauki.pl/articles/411684.pdf

Data publikacji:

2014

Wydawca:

Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN

Tematy:

damping coefficient
electromagnetic waves
frequency
photonic crystal
reflection
transmission

Opis:

In this work, reflection and transmission of electromagnetic wave by a periodic ferrite-dielectric photonic crystal are investigated theoretically and numerically. The ferrite material is described and its main parameters are given in detail. After the construction of the problem, the reflection and transmission coefficients are derived in a closed form by a transfer matrix method. The reflected, transmitted, and loss powers of the crystal are calculated using these coefficients. In the numerical results the mentioned powers are computed and illustrated as a function of frequency, angle of incidence, dielectric thickness, and applied magnetic field intensity when the damping coefficient changes.

Źródło:

International Letters of Chemistry, Physics and Astronomy; 2014, 14, 1; 86-98
2299-3843

Pojawia się w:

International Letters of Chemistry, Physics and Astronomy

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 91.

Tytuł:

Application of mixed collectors on quartz-feldspar by fluorine-free flotation separation and their interaction mechanism : a review

Autorzy:

Li, Peiyue
Ren, Zijie
Xie, Enjun
Duan, Shutong
Gao, Huimin
Wu, Jianxin
He, Yuhao

Powiązania:

https://bibliotekanauki.pl/articles/1446562.pdf

Data publikacji:

2021

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

quartz
feldspar
crystal structure
flotation
mixed collectors
environmentally friendly

Opis:

Quartz and feldspar are usually exist in symbiosis in nature, and they are difficult to be separated effectively by conventional physical methods owing to their similarities in crystal structures and surface characteristics. Flotation is the most resultful method, and especially, flotation with hydrofluoric acid (HF) is the most efficient way. Because HF may cause serious environmental and health problems, the effective and environmentally friendly separation of quartz and feldspar remains a formidable challenge. The crystal structure, surface broken bonds, surface energy, and solid–liquid interface properties of quartz and feldspar are investigated in this paper. In particular, some types of mixed cationic/anion collectors and their interaction mechanism on the quartz and feldspar surfaces with acidic, alkaline, and neutral media in the absence of fluorine are discussed, and the grade and scheme of quartz and feldspar for the practical application are illustrated. This review proposes concrete research approaches and provides perspectives for the advanced processing of quartz and feldspar in an environmentally friendly and economical way.

Źródło:

Physicochemical Problems of Mineral Processing; 2021, 57, 4; 139-156
1643-1049
2084-4735

Pojawia się w:

Physicochemical Problems of Mineral Processing

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 92.

Tytuł:

Determination of the temperature field using liquid crystal thermography and analysis of two-phase flow structures in research on boiling heat transfer in a minichannel

Autorzy:

Piasecka, M.

Powiązania:

https://bibliotekanauki.pl/articles/220691.pdf

Data publikacji:

2013

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

temperature measurement
liquid crystal thermography
measurement accuracy
void fraction

Opis:

The paper presents the application of liquid crystal thermography for temperature determination and visualisation of two phase flow images on the studied surface. Properties and applications of thermochromic liquid crystals are discussed. Liquid crystals were applied for two-dimensional detection of the temperature of the heating foil forming one of the surfaces of the minichannel along which the cooling liquid flowed. The heat flux supplied to the heating surface was altered in the investigation and it was accompanied by a change in the color distribution on the surface. The accuracy of temperature measurements on the surface with liquid crystal thermography is estimated. The method of visualisation of two-phase flow structures is described. The analysis of monochrome images of flow structures was employed to calculate the void fraction for some cross-sections. The flow structure photos were processed using Corel graphics software and binarized. The analysis of phase volumes employed Techsystem Globe software. The measurement error of void fraction is estimated.

Źródło:

Metrology and Measurement Systems; 2013, 20, 2; 205-216
0860-8229

Pojawia się w:

Metrology and Measurement Systems

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 93.

Tytuł:

Porównanie skuteczności odmanganiania wody na wybranych złożach porowatych
Comparison of manganese removal efficiency of water on selected porous filter beds

Autorzy:

Kisło, A.
Skoczko, I.

Powiązania:

https://bibliotekanauki.pl/articles/399739.pdf

Data publikacji:

2017

Wydawca:

Polskie Towarzystwo Inżynierii Ekologicznej

Tematy:

uzdatnianie wód podziemnych
mangan
złoża filtracyjne
masa G-1
złoże Crystal-Right
groundwater treatment
manganese
filter beds
G-1 mass
Crystal-Right

Opis:

Zgodnie z Rozporządzeniem Zdrowia z dn. 20 kwietnia 2010 r. stężenie manganu w wodzie nie może przekraczać 0,05 mg/l. Niniejsze uwarunkowanie wymusza uzdatnianie wód podziemnych i uzyskanie wymaganych stężeń. W tym celu stosowane są popularne materiały filtracyjne dostępne na krajowym rynku. Autorki w ramach badań przeprowadziły eksperymenty na dwóch złożach filtracyjnych. Pierwszym z nich była masa katalityczna G-1, drugim natomiast złoże Crystal-Right. Tym samym w niniejszym artykule przedstawiono metodykę badań, charakterystykę badanych złóż oraz wyniki badań wody, w tym zawartość w niej manganu po procesie filtracji.
According to the Health Regulations of 20 April 2010, the concentration of manganese in water must not exceed 0.05 mg/l. This condition enforces the treatment of underground water and achieving the required concentrations. For this purpose, popular filter materials are available on the domestic market. The authors in the study conducted experiments on two filter beds. The first was G-1 catalytic mass, whereas the second was Crystal-Right. Thus, this paper presents the methodology of the study, the characteristics of the studied fields and the results of water tests, including the content of manganese in the process after filtration.

Źródło:

Inżynieria Ekologiczna; 2017, 18, 4; 13-19
2081-139X
2392-0629

Pojawia się w:

Inżynieria Ekologiczna

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 94.

Tytuł:

Study of Nonlinear Optical Properties of Nematic Liquid Crystal Material by Z-Scan Technique

Autorzy:

Mousa, Abdulazeez O.
Kadhim, Yaseen H.
Naser, Ban A.

Powiązania:

https://bibliotekanauki.pl/articles/1189947.pdf

Data publikacji:

2016

Wydawca:

Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN

Tematy:

Nematic liquid crystal
Z-Scan technique
nonlinear refractive index
optical limiting

Opis:

The nonlinear optical properties of nematic liquid crystal material have been studied at different concentrations using Z-Scan technique. Experiments are performed using continuous wave (CW) diode solid state laser at 473 nm wavelength and 20 mW power. The nonlinear absorption coefficient β is calculated using open aperture Z-Scan data, while its nonlinear refractive index n2 is measured using the closed aperture Z-Scan data. In this work, six concentrations were prepared for (Di-Cinnamylidene Benzidine), these concentrations were (9×10-5, 8×10-5, 7×10-5, 6×10-5, 5× 10-5 and 4×10-5)M. The optical absorption and transmission spectra for these concentrations were measured by using UV-VIS spectrophotometer. Our results show that the nonlinearity are changed significantly with concentrations, in addition, the optical limiting behavior has been studied. The results confirmed the capability of the sample to be used as optical limiter device.

Źródło:

World Scientific News; 2016, 52; 57-69
2392-2192

Pojawia się w:

World Scientific News

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 95.

Tytuł:

Investigation of transmission properties of a tapered optical fibre with gold nanoparticles liquid crystal composite cladding

Autorzy:

Moś, Joanna E.
Stasiewicz, Karol A.
Jaroszewicz, Leszek R.

Powiązania:

https://bibliotekanauki.pl/articles/2174851.pdf

Data publikacji:

2022

Wydawca:

Polska Akademia Nauk. Stowarzyszenie Elektryków Polskich

Tematy:

tapered optical fibre
liquid crystals
liquid crystal composites
nanoparticles
optical sensor

Opis:

The article presents a study of a hybrid structure based on the combination of a tapered optical fibre and gold nanoparticles dispersed in a liquid crystal material. Sensitivity to changes of the refractive index of the environment in which the structure is located, as well as the possibility of changing the refractive index of liquid crystals by external factors, such as temperature and electric field, were investigated. Electro- and thermally-induced changes of the refractive index of a liquid crystal through the rotation of a molecule director, which cause changes in the light propagated in a tapered optical fibre, were described. The most important issue in the article is to determine the influence of doping a liquid crystal with gold nanoparticles the concentration of which varies between 0.1 and 0.3 wt.%. The paper presents transmission measurements in a wide optical range depending on voltage, temperature, and frequency changes. Additionally, time courses of the obtained signal were measured. The study shows that the appropriate selection of nanoparticle concentration has a huge impact on the optical wave propagation. The experimental results show that the optical changes obtained for the investigated hybrid structure prefer it for use as an electrooptical switcher, filter, or sensor.

Źródło:

Opto-Electronics Review; 2022, 30, 4; art. no. e143936
1230-3402

Pojawia się w:

Opto-Electronics Review

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 96.

Tytuł:

Coupled energy measurements in multi-core photonic-crystal fibers

Autorzy:

Klimek, J.

Powiązania:

https://bibliotekanauki.pl/articles/221407.pdf

Data publikacji:

2013

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

photonic crystal fibers
multi-core fibers
optical fiber measurements
photonic sensors

Opis:

This paper outlines a measurement method of properties of microstructured optical fibers that are useful in sensing applications. Experimental studies of produced photonic-crystal fibers allow for a better understanding of the principles of energy coupling in photonic-crystal fibers. For that purpose, fibers with different filling factors and lattice constants were produced. The measurements demonstrated the influence of the fiber geometry on the coupling level of light between the cores. For a distance between the cores of 15 μm, a very low level (below 2%) of energy coupling was obtained. For a distance of 13 μm, the level of energy transfer toneighboring cores on the order of 2-4% was achieved for a filling factor of 0.29. The elimination of the energycoupling penomenon between the cores was achieved by duplicating the filling factor of the fiber. The coupling level was as high as 22% in the case of fibers with a distance between the cores of 8.5 μm. Our results can be used for microstructured-fiber sensing applications and for transmission-channel switching in liquid-crystal multi-core photonic fibers.

Źródło:

Metrology and Measurement Systems; 2013, 20, 4; 689-696
0860-8229

Pojawia się w:

Metrology and Measurement Systems

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 97.

Tytuł:

Study on Synthesis and Modification of Conical Ni Structures by One-Step Method

Autorzy:

Skibińska, K.
Semeniuk, S.
Kutyła, D.
Kołczyk-Siedlecka, K.
Jędraczka, A.
Żabiński, P.

Powiązania:

https://bibliotekanauki.pl/articles/2049399.pdf

Data publikacji:

2021

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

electrodeposition
one-step method
crystal modifier
nickel cones
free-standing structures

Opis:

In this work the conical Ni structures were obtained from an electrolyte containing NH4Cl as a crystal modifier. This process is called one-step method and allows to cover large areas with micro- and nanostructures during a single electrodeposition. Presence of NH4Cl promotes a vertical direction of structure growth in order to block a horizontal one. Additionally, this method does not require using chromic acid solution, which is dangerous for the environment. Due to the ferromagnetic properties of Ni, obtained coatings could be applied as magnetic devices. The influence of the parameters such as a preparation of copper substrate, a composition of electrolyte and electrodeposition conditions (time, the electrolyte temperature and current density) was investigated in this work.

Źródło:

Archives of Metallurgy and Materials; 2021, 66, 3; 861-869
1733-3490

Pojawia się w:

Archives of Metallurgy and Materials

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 98.

Tytuł:

The Relationship between the Monomer Chain Length and the Electro-Optical Properties of Polymer Dispersed Liquid Crystals

Autorzy:

Liu, J.
Ozga, K.
Liu, X.
Zhen, Z.
Plucinski, K. J.
Szota, M.
Kityk, I. V.

Powiązania:

https://bibliotekanauki.pl/articles/958219.pdf

Data publikacji:

2016

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

liquid crystal
electro-optical property
polymer dispersed
mesh size
response time

Opis:

Five polymers dispersed liquid crystalline (LC) films were fabricated using photo-polymerizable monomers with different lengths of carbon chains. These LC films have shown different electro-optical (EO) properties. Through their SEM pictures, the relationship between the linear electro-optical effect and the mesh size of the polymer network was explored. With the increase of number of photo-polymerizable monomers, the mesh size of the polymer network would become larger. So the liquid crystal molecules would be easily oriented in the electric field and therefore, the threshold voltage and saturation voltage would decrease. The open state response times were also reduced and the off state response times would be extended. The DFT simulations have shown principal role of the ground state dipole moments in the observed electro-optical efficiency.

Źródło:

Archives of Metallurgy and Materials; 2016, 61, 1; 457-460
1733-3490

Pojawia się w:

Archives of Metallurgy and Materials

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 99.

Tytuł:

Synthesis of an optical catalyst for cracking contaminating dyes in the wastewater of factories using indium oxide in nanometer and usage in agriculture

Autorzy:

Ahmed, Ishaq F. E.
El-Shenawy, Ahmed I.
Refat, Moamen S.

Powiązania:

https://bibliotekanauki.pl/articles/778735.pdf

Data publikacji:

2019

Wydawca:

Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie

Tematy:

Photocatalyst
In2O3
precursors
Crystal Violet
Congo Red
NPs

Opis:

Herein, the photocatalytic degradation of the Congo Red (CR) and Crystal Violet (CV) dyes in an aqueous solution were discussed in the presence of an indium(III) oxide (In₂O₃) as optical catalyst efficiency. The caproate bidentate indium(III) precursor complex has been synthesized and well interpreted by elemental analysis, molar conductivity, Fourier transform infrared (FT-IR), UV-Vis, and thermogravimetric (TGA) with its differential thermogravimetric (DTG) studies. The microanalytical and spectroscopic assignments suggested that the associated of mononuclear complex with 1:3 molar ratio (M³⁺:ligand). Octahedral structure is speculated for this parent complex of the caproate anion, CH₃(CH₂)₄COO⁻ ligand. The In₂O₃  NPs with nanoscale range within 10–20 nm was synthesized by a simple, low cost and eco-friendly method using indium(III) caproate complex. Indium oxide nanoparticles were formed after calcination of precursor in static air at 600°C for 3 hrs. The structural, grain size, morphological and decolorization efficiency of the synthesized NPs were characterized using the FT-IR, X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive X-ray analysis (EDX) and transmission electron microscopy (TEM) analyses. It was worthy mentioned that the prepared In₂O₃  NPs showed a good photodegradation properties against CR and CV organic dyes during 90 min.

Źródło:

Polish Journal of Chemical Technology; 2019, 21, 4; 98-105
1509-8117
1899-4741

Pojawia się w:

Polish Journal of Chemical Technology

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 100.

Tytuł:

Effect of Powder Size on the Microstructure and Magnetic Properties of Nd-Fe-B Magnet Alloy

Autorzy:

Cho, Ju-Young
Abbas, Sardar Farhat
Choa, Yong-Ho
Kim, Taek-Soo

Powiązania:

https://bibliotekanauki.pl/articles/353634.pdf

Data publikacji:

2019

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

Nd-Fe-B
gas atomization
powder size
crystal orientation
hot deformation

Opis:

Rare earth Nd-Fe-B, a widely used magnet composition, was synthesized in a shape of powders using gas atomization, a rapid solidification based process. The microstructure and properties were investigated in accordance with solidification rate and densification. Detailed microstructural characterization was performed by using scanning electron microscope (SEM) and the structural properties were measured by using X-ray diffraction. Iron in the form of α-Fe phase was observed in powder of about 30 μm. It was expected that fraction of Nd₂ Fe₁₄ B phase increased rapidly with decrease in powder size, on the other hand that of α-Fe phase was decreased. Nd-rich phase diffused from grain boundary to particle boundary after hot deformation due to capillary action. The coercivity of the alloy decreased with increase in powder size. After hot deformation, Nd₂ Fe₁₄ B phase tend to align to c-axis.

Źródło:

Archives of Metallurgy and Materials; 2019, 64, 2; 623-626
1733-3490

Pojawia się w:

Archives of Metallurgy and Materials

Dostawca treści:

Biblioteka Nauki

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