Temat: crystals - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Fabrication of photonic crystal structures by laser lithography
Autorzy:: Mizeikis, V.
Seet, K. K.
Juodkazis, S.
Misawa, H.
Powiązania:: https://bibliotekanauki.pl/articles/385210.pdf
Data publikacji:: 2009
Wydawca:: Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Automatyki i Pomiarów
Tematy:: photonic crystals
laser lithography
Opis:: Using femtosecond laser lithography technique, we have fabricated 3D PhC structures having woodpile and spiral architectures in photoresists, and investigated their photonic properties. The fabricated structures exhibit good structural quality, evidenced by long-range periodicity and absence of deformations, and photonic stop-gaps at nearinfrared and infrared wavelengths, evidenced by spectral bands of high reflectivity. These structures can be used as templates for further enhancement by infiltration of metals or high refractive index materials, such as Si.
Źródło:: Journal of Automation Mobile Robotics and Intelligent Systems; 2009, 3, 4; 99-101
1897-8649
2080-2145
Pojawia się w:: Journal of Automation Mobile Robotics and Intelligent Systems
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Investigations of hydroxyapatite crystals in oral care products using the TEM method
Autorzy:: Pajchel, Ł.
Malicka, A.
Pajchel, A.
German, R.
Kolodzijski, W.
Powiązania:: https://bibliotekanauki.pl/articles/285619.pdf
Data publikacji:: 2018
Wydawca:: Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
Tematy:: hydroxyapatite
crystals
TEM method
Źródło:: Engineering of Biomaterials; 2018, 21, 148; 42
1429-7248
Pojawia się w:: Engineering of Biomaterials
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Telecommunication filter based on the symmetrical photonic crystal Bg5/Cu1/Bg5
Autorzy:: Baraket, Z.
Zaghdoudi, J.
Kanzari, M.
Powiązania:: https://bibliotekanauki.pl/articles/175028.pdf
Data publikacji:: 2018
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:: symmetry
telecommunication
photonic crystals
Opis:: Thanks to the transfer matrix method, we perform a theoretical investigation of the optical properties of the symmetrical photonic crystal designed as Bg₅/Cu₁/Bg₅, where Cu₁ is the first generation of the copper mean sequence and Bg₅ is the fifth generation of the Bragg sequence. We design a developed polychromatic filter which allows the transmission of all the telecommunication wavelengths 0.85, 1.3, and 1.55 µm at oblique incidence for both of TE and TM polarization with a high transmission rate and high quality factor. This photonic crystal can be employed in the fabrication of telecommunication devices.
Źródło:: Optica Applicata; 2018, 48, 3; 361-371
0078-5466
1899-7015
Pojawia się w:: Optica Applicata
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Surface structure changes of InP and GaAs single crystals irradiated with high energy electrons and swift heavy ions
Autorzy:: Didyk, A.
Komarov, F.
Vlasukova, L.
Yuvchenko, V.
Hofman, A.
Powiązania:: https://bibliotekanauki.pl/articles/147490.pdf
Data publikacji:: 2006
Wydawca:: Instytut Chemii i Techniki Jądrowej
Tematy:: InP crystals
GaAs crystals
preliminary disorder
swift ion irradiation
surface topography
macrodefect
Opis:: InP and GaAs crystal structure changes under the influence of swift Kr and Bi ions have been studied by means of scanning electron microscopy, atomic force microscopy and selective chemical etching. The previous disordering of samples by electron irradiation has shown to lead to macrodefect formation in the form of cracks and breaks, at the depths near the ion end-of-range, and on the crystal surface. A possible explanation of the observed effects is proposed.
Źródło:: Nukleonika; 2006, 51, 2; 105-109
0029-5922
1508-5791
Pojawia się w:: Nukleonika
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Dielectric photonic quasi-crystals with doubled quasi-periodicity
Autorzy:: Vorgul, I.Yu.
Marciniak, M.
Powiązania:: https://bibliotekanauki.pl/articles/308759.pdf
Data publikacji:: 2000
Wydawca:: Instytut Łączności - Państwowy Instytut Badawczy
Tematy:: photonic crystals
optical pulse transformation
Opis:: Optical range electromagnetic field interaction with inhomogeneous finite dielectric media is investigated. New method for analysis of this interaction in 1D case based on integral equations for fields in transient media is proposed. Some special cases of quasi-periodical structures with doubled quasi-periodicity are investigated numerically. A possibility to obtain good filtering properties in such structures for small number of quasi-periods is shown.
Źródło:: Journal of Telecommunications and Information Technology; 2000, 1-2; 77-79
1509-4553
1899-8852
Pojawia się w:: Journal of Telecommunications and Information Technology
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Examination of refractive indices and propagation losses in PSLC mixtures with various monomer concentration
Badanie współczynników załamania i strat propagacyjnych w stabilizowanych polimerowo ciekłych kryształach (ang. PSLCs) o różnej koncentracji monomeru
Autorzy:: Pachacz, A.
Rutkowska, K.
Powiązania:: https://bibliotekanauki.pl/articles/270593.pdf
Data publikacji:: 2018
Wydawca:: Centralny Ośrodek Badawczo-Rozwojowy Aparatury Badawczej i Dydaktycznej, COBRABiD
Tematy:: optoelektronika
optyka zintegrowana
ciekłe kryształy
optoelectronics
integrated optics
liquid crystals
Polymer Stabilized Liquid Crystals
Opis:: In this research study on liquid crystalline materials mixed with other compounds, specifically with monomers, is presented. Research covers measurements of the refractive indices and the attenuation constant of the polymer stabilized liquid crystals (PSLCs). The latter are specific type of mixture, containing liquid crystal together with less than 10% weight concentration of the monomer and UV-sensitive activator. In this sense, the variety of available liquid crystals and monomers, gives a huge number of different mixtures that can be potentially obtained [1]. Each combination of particular compounds and their weight ratios, results in different physical properties of the mixture, so knowledge about, how each of these factors influences the final product, is fundamental. PSLCs, thanks to their tunable properties, provide wide range of potential applications in integrated optics as e.g. varifocal lenses, sensors, waveguiding layers, etc., but first their optical parameters have to be examined in detail [2, 3].
W niniejszym artykule przedstawiono badania nad ciekłymi kryształami połączonymi z innymi materiałami, w szczególności z monomerami. Badania obejmują pomiary współczynników załamania oraz współczynnika tłumienia w ciekłych kryształach stabilizowanych polimerem (ang. PSLC). PSLC to rodzaj mieszaniny, w której skład, oprócz ciekłego kryształu, wchodzi mniej niż 10% wagowego stężenia monomeru oraz śladowe ilości aktywatora optycznego. Biorąc pod uwagę różnorodność związków ciekłokrystalicznych i monomerów, można uzyskać ogromną liczbę mieszanin o różnych właściwościach fizycznych [1]. Znajomość tychże właściwości jest kluczowa w kontekście praktycznego zastosowania mieszanin PSLC. Mieszaniny tego typu, dzięki możliwości uzyskania związku o konkretnych właściwościach fizycznych i chemicznych, można zastosować w optyce zintegrowanej, np. do zmiennoogniskowych soczewek, czujników, jako warstwy falowodowe itp., jednak zanim to nastąpi, należy szczegółowo zbadać i wyznaczyć ich parametry optyczne [2, 3].
Źródło:: Aparatura Badawcza i Dydaktyczna; 2018, 23, 3; 128-137
2392-1765
Pojawia się w:: Aparatura Badawcza i Dydaktyczna
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Numerical evaluation of sound attenuation provided by periodic structures
Autorzy:: Martins, M.
Godinho, L.
Picado-Santos, L.
Powiązania:: https://bibliotekanauki.pl/articles/176630.pdf
Data publikacji:: 2013
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: traffic noise
sonic crystals
numerical method
Opis:: The use of periodic structures as noise abatement devices has already been the object of considerable research seeking to understand its efficiency and see to what extent they can provide a functional solu- tion in mitigating noise from different sources. The specific case of sonic crystals consisting of different materials has received special attention in studying the influence of different variables on its acoustic performance. The present work seeks to contribute to a better understanding of the behavior of these structures by implementing an approach based on the numerical method of fundamental solutions (MFS) to model the acoustic behavior of two-dimensional sonic crystals. The MFS formulation proposed here is used to evaluate the performance of crystals composed of circular elements, studying the effect of varying dimen- sions and spacing of the crystal elements as well as their acoustic absorption in the sound attenuation provided by the global structure, in what concerns typical traffic noise sources, and establishing some broad indications for the use of those structures.
Źródło:: Archives of Acoustics; 2013, 38, 4; 503-516
0137-5075
Pojawia się w:: Archives of Acoustics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: Identifying of thermotropic liquid crystal phase and its influence on lubricity of ionic liquids
Autorzy:: Kałdoński, T. J.
Piecek, W.
Kałdoński, T.
Pawlak, Z.
Powiązania:: https://bibliotekanauki.pl/articles/244373.pdf
Data publikacji:: 2015
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: mesophase identification
liquid crystals
ionic liquids
Opis:: In this article there is discussed a possibility of forming the liquid crystal structure in ionic liquids and its influence on performance characteristics, especially tribological, of these liquids. Formation of such thermal phase might influence on, among other things, easier creation of the boundary lubricating film, which is characterized by high viscous anisotropy. The results of tribological tests showed better lubricity of selected ionic liquids than modern PFPE oils. Identification of mesophase in ionic liquids was necessary. This method is described in the paper. Biolar PL polarizing interference microscope with thermal stabilizing table, with birefraction system, and Brüker Discover 8 powder diffraction instrument with a Cu lamp and monochromator were used. There was being searched the state characterized simultaneously by optical anisotropy properties and liquid state of aggregation. For identification of phase transition temperature, the additional calorimetric tests were carried out during the cycle of heating and cooling. These researches were carried out within the framework of the development and research project no. PBR 15-249/2007/WAT-OR0002904, financed by Ministry of Science and Higher Education during 2007-2011.
Źródło:: Journal of KONES; 2015, 22, 1; 143-156
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: Mesogenic Dependence of Chalconyl Schiff’s Bases on Molecular Rigidity and Flexibility
Autorzy:: Pandya, S. H.
Patel, V. R.
Doshi, A. V.
Powiązania:: https://bibliotekanauki.pl/articles/1178290.pdf
Data publikacji:: 2017
Wydawca:: Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:: Enantiotropy
Liquid Crystals
Mesomorphism
Nematic
Smetic
Opis:: A novel homologous series R0-C6H4.CH:N-C6H4.CO.CH:CH-C6H4-OC6H13(n) of liquid crystal property is synthesized and studied with a view to understand and establish the effect of molecular structure on liquid crystal properties with respect to Schiff base and chalconyl central bridges as well as changing left n-alkoxy terminal and right n-hexyloxy fixed tail ended group. Homologous series consisted of eleven (C1 to C16) homologues in which the nematogenic mesomorphism commences from C3 homologue and continued to last C16 homologue without exhibition of smectogenic property. Rest of the C1 and C2 homologues are nonmesomorphic, whose Latent transition temperature (LTT) are predicted by extrapolation of N-I transition curves. Odd-even effect is observed for N-I transition curve. N-I transition curve and Cr-N/I transition curve behaved in normal manner. The Nematic thermal stability is 72.2 ° C. The minimum and maximum nematogenic mesophaselengths are ranging between 12.0 °C and 30.0 °C at C16 and C14 homologue respectively. Transition temperatures were determined by an optical polarizing microscopy (POM), equipped with a heating stage. Thermal analytical and spectral data confirms the molecular structures of homologues. The novel homologous series of chalconyl Schiff’s base is low melting series, whose mesogenic transition temperatures ranges between 43.0 °C and 79.0 °C.
Źródło:: World Scientific News; 2017, 86, 3; 242-252
2392-2192
Pojawia się w:: World Scientific News
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: Dependence of Molecular Flexibility of Lateral Group on Mesomorphism
Autorzy:: Jain, B. B.
Patel, R. B.
Powiązania:: https://bibliotekanauki.pl/articles/1191454.pdf
Data publikacji:: 2016
Wydawca:: Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:: Liquid Crystals
Smectic
Nematic
monotropy
Enantiotropy
Opis:: A Chalconyl homologous series: RO-C6H4-CH=CH-CO-C6H4-OC12H25(n) (meta) of novel liquid crystalline (LC) derivatives of thermotropic variety have been synthesized and studied with a view to understand the effect of molecular structure on LC behaviours with reference to varying flexibility due to tailed end group for the same homologue and from homologue to homologue in the same series. A novel series consisted of thirteen homologues whose first member is nonliquidcrystals and the rest of the homologues are LC in enantiotropic or monotropic condition. Nematogenic mesomorphism commences from C2 homologue. C2 to C5 homologues are enantiotropic nematic and C6 to C18 homologues are monotropic nematic. Smectogenic character commences from C4 homologue as enantiotropic manner and C6 to C18 derivatives are monotroic smectic. Transition temperatures and textures of mesophases were determined by an optical polarising microscopy (POM) equipped with a heating stage. The transition curves of a phase diagram behaved in normal manner. Spectral, analytical and thermal data supported the molecular structures of homologues. Thermal stability for smectic is low of the order of 56.0 °C and that of the nematic is 70.5 °C. The corresponding mesophaselengths for smectic and nematic are varied minimum to maximum are 1 or 2 °C to 15 °C and 5 to 29 °C respectively. The group efficiency order derived on the basis of thermal stability .
Źródło:: World Scientific News; 2016, 40; 135-146
2392-2192
Pojawia się w:: World Scientific News
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 11.

Tytuł:: The effect of the symmetrical deformation y = xk + 1 on the optimization of the symmetrical multiple channeled white light color filter
Autorzy:: Baraket, Z.
Zaghdoudi, J.
Kanzari, M.
Powiązania:: https://bibliotekanauki.pl/articles/173545.pdf
Data publikacji:: 2017
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:: photonic crystals
symmetry
filter
polarization
optimization
Opis:: In this paper, we consider a hybrid photonic crystal symmetrically deformed (Bg₅/Cu₃/Bg₅) consisting of the third generation of the copper mean sequence (Cu₃), sandwiched between two Bragg mirrors at the fifth generation (Bg₅). Our system realizes a polychromatic filter that transmits five wavelengths in the visible spectrum independently of the polarization of the light transverse electric or transverse magnetic. Secondly, the photonic crystal (Bg₅/Cu₃/Bg₅) undergoes the deformation y = x^{k + 1} (where k is the degree of deformation, x and y are respectively the coordinates of the system before and after the deformation). With a proper choice of the degree of deformation k, this photonic crystal maintains its property of polychromatic filter whose transmission wavelength is independent of the polarization’s state. Thanks to this deformation, we can disperse the optical windows in different spectra of visible light and exactly in the violet, blue, green, and orange light. This system can be used in the fabrication of color filter devices and the white light emitting diodes.
Źródło:: Optica Applicata; 2017, 47, 1; 19-28
0078-5466
1899-7015
Pojawia się w:: Optica Applicata
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 12.

Tytuł:: Colloidal crystal cladded microfiber for refractive index sensing
Autorzy:: Yan, H. T.
Zhao, X Y
Zhang, Ch.
Zhen, Z Q
Li, Q Z
Cao, J X
Xia, L X
Powiązania:: https://bibliotekanauki.pl/articles/174902.pdf
Data publikacji:: 2014
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:: microfibers
colloidal crystals
refractive index sensing
Opis:: We investigate the evanescent field of a microfiber wrapped by colloidal crystals. The microfiber has the diameter of about 1 μm that is drawn from a single-mode fiber with an alcohol lamp. The colloidal spheres are further attached to the microfiber through thermal evaporation, then they self-assemble to crystal-like structures. The 400 nm, 590 nm, and 710 nm-diameter SiO2 colloidal spheres are used, respectively. The spectral responses are studied theoretically and experimentally, and the results agree with each other. It is revealed that the evanescent field of a microfiber could be modulated by the photonic band-gap of colloidal crystals. This characteristic is very useful in refractive index sensing for liquids.
Źródło:: Optica Applicata; 2014, 44, 2; 309-315
0078-5466
1899-7015
Pojawia się w:: Optica Applicata
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 13.

Tytuł:: Twist Grain Boundary phases in binary mixture of Liquid Crystals
Autorzy:: Chaudhry, Manisha
Powiązania:: https://bibliotekanauki.pl/articles/1159586.pdf
Data publikacji:: 2018
Wydawca:: Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:: Binary mixture
Liquid crystals
TGB
TGBA*
Opis:: The Investigations of Twist Grain Boundary (TGB) phases in liquid crystals exhibits in different types of structural groups. In this study, these new findings present in the binary mixture of highly chiral liquid crystal, Cholesteric Nonanoate (CN) and nematic liquid crystal, N-(4-Ethoxy benzylidine)-4-butyle aniline (EBBA). The Differential Scanning Calorimeter (DSC) has shown the thermodynamic phase transition of binary mixture at different scanning rate. At the other hand Optical studies of Twist grain boundary phases has also shown different type of textures. The domain of existence of TGB has exhibited with the weight percentage of EBBA is increased in highly chiral liquid crystals. This is very excited fact that the temperature range of type of TGB (TGBA*) phase is different at the different scanning rate. In the optical investigation we found new phases in cooling cycle as compare to the heating cycle.
Źródło:: World Scientific News; 2018, 113; 148-156
2392-2192
Pojawia się w:: World Scientific News
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 14.

Tytuł:: Dependence of Mesomorphism on meta Substituted Lateral Groups
Autorzy:: Jain, B. B.
Patel, R. B.
Powiązania:: https://bibliotekanauki.pl/articles/1191468.pdf
Data publikacji:: 2016
Wydawca:: Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:: Smectic
Nematic
Mesomorphism
Liquid Crystals
monotropy
Opis:: Thermotropic LC substances of chalconyl derivatives consisting of two phenyl rings, one chalconyl central bridge and two flexible {-OR and -OC7H15(n)} terminal (para) / lateral (meta) functional groups i.e. RO-C6H4-CH=CH-CO-C6H4-OC7H15(n) (meta) have been synthesized and studied for the effect of molecular structure on thermotropicmesomorphism. The thermometric behaviours of novel homologue substances and their textures were determined by an optical polarizing microscopy (POM) equipped with a heating stage. Textures of a nematic phases are threaded or schlieren. The textures of monotropicsmectic phase are directly judged from the heating top as smectic-A. Analytical, thermal and spectral data supports and conforms the molecular structures of homologues. Transition curves as depicted in a phase diagram behaves in normal manner. Odd-even effect for N-I transition curve (very short) is observed. Total (C1 to C18) thirteen homologues are synthesized .Mesomorphism commences from C7 homologue. C7 to C8 homologues are enantiotropicnematic and C10 to C18 homologues are monotropicllynematogenic plus smectogenic. Thermal stability of smectic phase is about fraction of 1.0 °C or 1.0 °C and that of nematic phase is 66.0 °C with total mesophaselength minimum to maximum 7.0 °C to 15 °C. Group efficiency order for mesophases is derived on the basis of thermal stabilities from the comparative study of thermometric data determined from structurally analogous series. Hence present novel series behaves in normal manner with very short mesophaselengths, low thermal stabilities and low melting type and predominantly nematogenic and partly smectogenic.
Źródło:: World Scientific News; 2016, 40; 199-210
2392-2192
Pojawia się w:: World Scientific News
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 15.

Tytuł:: Positron annihilation in liquid crystals
Autorzy:: Dryzek, E.
Juszyńska-Gałązka, E.
Powiązania:: https://bibliotekanauki.pl/articles/148118.pdf
Data publikacji:: 2015
Wydawca:: Instytut Chemii i Techniki Jądrowej
Tematy:: liquid crystals
positron annihilation
phase transitions
Opis:: Positron annihilation studies of liquid crystals are reviewed with particular reference to thermotropic liquid crystals with rod-like molecules. The studies of compounds exhibiting smectic A or smectic E phases indicate that local arrangement of dipole molecules play an important role because high electron density at the end group of molecules can influence substantially formation and annihilation of positronium. The obtained ortho-positronium lifetimes in these phases can be explained by antiparallel pairing of molecules in case of the smectic A phase or a structure with a nanosegregation of alkyl chains and others parts of molecules into sublayers and liquid-like state of alkyl chains in case of the smectic E phase.
Źródło:: Nukleonika; 2015, 60, No. 4, part 1; 703-708
0029-5922
1508-5791
Pojawia się w:: Nukleonika
Dostawca treści:: Biblioteka Nauki

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