133 research outputs found
Cathodoluminescence from Organic Bilayer Induced by Field Electron Emission of Carbon Nanotubes
Magnetocrystalline anisotropic effect in GdCoFeAsO ()
From a systematic study of the electrical resistivity , magnetic
susceptibility , isothermal magnetization and the specific
heat , a temperature-magnetic field (-) phase diagram has been
established for GdCoFeAsO ( and ) polycrystalline
compounds. GdCoAsO undergoes two long-range magnetic transitions: ferromagnetic
(FM) transition of Co electrons () and
antiferromagnetic (AFM) transition of Gd electrons
(). For the Fe-doped sample (), an extra
magnetic reorientation transition takes place below ,
which is likely associated with Co moments. The two magnetic species of Gd and
Co are coupled antiferromagnetically to give rise to ferrimagnetic (FIM)
behavior in the magnetic susceptibility. Upon decreasing the temperature (), the magnetocrystalline anisotropy breaks up the FM
order of Co by aligning the moments with the local easy axes of the various
grains, leading to a spin reorientation transition at
. By applying a magnetic field,
monotonically decreases to lower temperatures, while
the is relatively robust against the external field.
On the other hand, the applied magnetic field pulls the magnetization of grains
from the local easy direction to the field direction via a first-order
reorientation transition, with the transition field () increasing
upon cooling the temperature.Comment: accepted by physical Review B 6 figures and 7 page
Observation of inhibited spontaneous emission and stimulated emission of rhodamine 6G in polymer replica of synthetic opal
This article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing. This article appeared in K. Yoshino, S. B. Lee,b) S. Tatsuhara, Y. Kawagishi, and M. Ozaki, and A. A. Zakhidov, Appl. Phys. Lett. 73, 3506 (1998) and may be found at https://doi.org/10.1063/1.122819
Nonlocal electrodynamics of two-dimensional wire mesh photonic crystals
We calculate analytically the spectra of plasma waves and electromagnetic
waves (EMW) in metallic photonic crystal consisting of the parallel thin
infinite metallic cylinders embedded in the dielectric media. The axes of
metallic cylinders form a regular square lattice in a plane perpendicular to
them. The metal inside the cylinders is assumed to be in the high frequency
regime , where is the relaxation time. The proposed
analytical theory is based upon small parameters , where is the
volume fraction of the metal, and , where is the wave vector and
is the radius of the cylinder. It is shown that there are five different
branches of the EMW that cover all frequency range under consideration except
one very small omnidirectional gap in the vicinity of the frequency of the
surface plasmon. However, at some directions of propagation and polarizations
the gap may be much larger. The reflection and refraction of the EMW is also
considered. The general theory of refraction is proposed which is complicated
by the spatial dispersion of the dielectric constant, and one particular
geometry of the incident EMW is considered.Comment: 14 pages, 8 figure
Photonic Crystals from Inverted Opals: Tunability, Solvatochromizm and Optics of Metallicity Gaps
Braggoriton--Excitation in Photonic Crystal Infiltrated with Polarizable Medium
Light propagation in a photonic crystal infiltrated with polarizable
molecules is considered. We demonstrate that the interplay between the spatial
dispersion caused by Bragg diffraction and polaritonic frequency dispersion
gives rise to novel propagating excitations, or braggoritons, with intragap
frequencies. We derive the braggoriton dispersion relation and show that it is
governed by two parameters, namely, the strength of light-matter interaction
and detuning between the Bragg frequency and that of the infiltrated molecules.
We also study defect-induced states when the photonic band gap is divided into
two subgaps by the braggoritonic branches and find that each defect creates two
intragap localized states inside each subgap.Comment: LaTeX, 8 pages, 5 figure
Silver nanowires on carbon nanotube aerogel sheets for flexible, transparent electrodes
Flexible, free-standing transparent conducting electrodes (TCEs) with simultaneously tunable transmittances up to 98% and sheet resistances down to 11 β¦/sq were prepared by a facile spray-coating method of silver nanowires (AgNWs) onto dry-spun multiwall carbon nanotube (MWNT) aerogels. Counterintuitively, the transmittance of the hybrid electrodes can be increased as the mass density of AgNWs within the MWNT aerogels increases, however, the final achievable transmittance depends on the initial transparency of the MWNT aerogels. Simultaneously, a strong decrease in sheet resistance is obtained when AgNWs form a percolated network along the MWNT aerogel. Additionally, anisotropic reduction in sheet resistance and polarized transmittance of AgNW/MWNT aerogels is achieved with this method. The final AgNW/MWNT hybrid TCEs transmittance and sheet resistance can be fine-tuned by spray-coating mechanisms or by choosing initial MWNT aerogel density. Thus, a wide range of AgNW/MWNT hybrid TCEs with optimized optoelectronic properties can be achieved depending of the requirements needed. Finally, the free-standing AgNW/MWNT hybrid TCEs can be laminated onto a wide range of substrates without the need of a bonding aid
Π ΠΈΡΠΊΠΈ Ρ ΠΈΡΡΡΠ³ΠΈΡΠ΅ΡΠΊΠΎΠ³ΠΎ Π»Π΅ΡΠ΅Π½ΠΈΡ Π³Π»Π°ΡΠΊΠΎΠΌΡ Π½Π° Π΅Π΄ΠΈΠ½ΡΡΠ²Π΅Π½Π½ΠΎΠΌ Π²ΠΈΠ΄ΡΡΠ΅ΠΌ Π³Π»Π°Π·Ρ Ρ Π΄Π°Π»Π΅ΠΊΠΎΠ·Π°ΡΠ΅Π΄ΡΠ΅ΠΉ ΡΡΠ°Π΄ΠΈΠ΅ΠΉ Π·Π°Π±ΠΎΠ»Π΅Π²Π°Π½ΠΈΡ
This review summarizes the results of surgical treatment of far-advanced stage glaucoma in the only seeing eye. A literature search performed in the PubMed search engine and aimed at finding publications reporting the clinical outcomes of treatment in patients with glaucoma in the only seeing eye did yield sufficient data related to the topic. A comprehensive analysis of the available data was performed with an emphasis on the choice of treatment tactics and postoperative results at various times following a surgery. Several studies allowed to perform a comparison of the clinical advantages and cost-effectiveness of medical treatment versus surgery for advanced glaucoma, as well as to assess potential risks and adverse outcomes such as glaucoma progression, postoperative scarring, hypotension and other complications. The results presented in this review suggest that common success criteria can provide uniformity in academic studies, but in daily clinical practice each glaucoma specialist must make a patient-specific decision in favor of either of these methods of treatment in order to guarantee an optimal result, both for the doctor and, of course, for the patient.Π¦Π΅Π»Ρ ΠΎΠ±Π·ΠΎΡΠ° β ΠΎΠ±ΠΎΠ±ΡΠΈΡΡ ΡΠ΅Π·ΡΠ»ΡΡΠ°ΡΡ, ΠΏΠΎΠ»ΡΡΠ΅Π½Π½ΡΠ΅ ΠΏΠΎΡΠ»Π΅ ΠΏΡΠΎΠ²Π΅Π΄Π΅Π½Π½ΠΎΠ³ΠΎ Ρ
ΠΈΡΡΡΠ³ΠΈΡΠ΅ΡΠΊΠΎΠ³ΠΎ Π»Π΅ΡΠ΅Π½ΠΈΡ Π΄Π°Π»Π΅ΠΊΠΎΠ·Π°ΡΠ΅Π΄ΡΠ΅ΠΉ ΡΡΠ°Π΄ΠΈΠΈ Π³Π»Π°ΡΠΊΠΎΠΌΡ Π½Π° Π΅Π΄ΠΈΠ½ΡΡΠ²Π΅Π½Π½ΠΎ Π²ΠΈΠ΄ΡΡΠ΅ΠΌ Π³Π»Π°Π·Ρ. ΠΠΎΠΈΡΠΊ Π»ΠΈΡΠ΅ΡΠ°ΡΡΡΡ, Π²ΡΠΏΠΎΠ»Π½Π΅Π½Π½ΡΠΉ Π² ΠΏΠΎΠΈΡΠΊΠΎΠ²ΠΎΠΉ ΡΠΈΡΡΠ΅ΠΌΠ΅ PubMed ΠΈ Π½Π°ΠΏΡΠ°Π²Π»Π΅Π½Π½ΡΠΉ Π½Π° ΠΎΠ±Π½Π°ΡΡΠΆΠ΅Π½ΠΈΠ΅ ΠΏΡΠ±Π»ΠΈΠΊΠ°ΡΠΈΠΉ, ΡΠΎΠΎΠ±ΡΠ°ΡΡΠΈΡ
ΠΎ ΠΊΠ»ΠΈΠ½ΠΈΡΠ΅ΡΠΊΠΈΡ
ΡΠ΅Π·ΡΠ»ΡΡΠ°ΡΠ°Ρ
ΠΏΡΠΎΠ²Π΅Π΄Π΅Π½Π½ΠΎΠ³ΠΎ Π»Π΅ΡΠ΅Π½ΠΈΡ Ρ ΠΏΠ°ΡΠΈΠ΅Π½ΡΠΎΠ² Ρ Π³Π»Π°ΡΠΊΠΎΠΌΠΎΠΉ Π½Π° Π΅Π΄ΠΈΠ½ΡΡΠ²Π΅Π½Π½ΠΎ Π²ΠΈΠ΄ΡΡΠ΅ΠΌ Π³Π»Π°Π·Ρ, Π½Π΅ ΠΏΠΎΠ·Π²ΠΎΠ»ΠΈΠ» Π½Π°ΠΌ Π½Π°ΠΉΡΠΈ Π΄ΠΎΡΡΠ°ΡΠΎΡΠ½ΠΎΠ³ΠΎ ΠΎΠ±ΡΠ΅ΠΌΠ° ΡΠ°ΠΊΠΎΠ³ΠΎ ΡΠΎΠ΄Π° ΠΈΡΡΠ»Π΅Π΄ΠΎΠ²Π°Π½ΠΈΠΉ. ΠΡΠΎΠ²Π΅Π΄Π΅Π½ Π²ΡΠ΅ΡΡΠΎΡΠΎΠ½Π½ΠΈΠΉ Π°Π½Π°Π»ΠΈΠ· ΠΈΠΌΠ΅ΡΡΠΈΡ
ΡΡ Π΄Π°Π½Π½ΡΡ
Ρ Π°ΠΊΡΠ΅Π½ΡΠΎΠΌ Π½Π° Π²ΡΠ±ΠΎΡ ΡΠ°ΠΊΡΠΈΠΊΠΈ Π»Π΅ΡΠ΅Π½ΠΈΡ ΠΈ ΠΏΠΎΡΠ»Π΅ΠΎΠΏΠ΅ΡΠ°ΡΠΈΠΎΠ½Π½ΡΠ΅ ΡΠ΅Π·ΡΠ»ΡΡΠ°ΡΡ Π² ΡΠ°Π·Π»ΠΈΡΠ½ΡΠ΅ ΡΡΠΎΠΊΠΈ ΠΏΠΎΡΠ»Π΅ ΠΎΠΏΠ΅ΡΠ°ΡΠΈΠΈ. ΠΠ΅ΠΊΠΎΡΠΎΡΡΠ΅ ΠΈΡΡΠ»Π΅Π΄ΠΎΠ²Π°Π½ΠΈΡ ΠΏΠΎΠ·Π²ΠΎΠ»ΠΈΠ»ΠΈ ΡΡΠ°Π²Π½ΠΈΡΡ ΠΊΠ»ΠΈΠ½ΠΈΡΠ΅ΡΠΊΡΡ ΠΈ ΡΠΊΠΎΠ½ΠΎΠΌΠΈΡΠ΅ΡΠΊΡΡ ΡΡΡΠ΅ΠΊΡΠΈΠ²Π½ΠΎΡΡΡ ΠΌΠ΅Π΄ΠΈΠΊΠ°ΠΌΠ΅Π½ΡΠΎΠ·Π½ΠΎΠ³ΠΎ Π»Π΅ΡΠ΅Π½ΠΈΡ ΠΏΠΎ ΡΡΠ°Π²Π½Π΅Π½ΠΈΡ Ρ Ρ
ΠΈΡΡΡΠ³ΠΈΡΠ΅ΡΠΊΠΈΠΌ Π»Π΅ΡΠ΅Π½ΠΈΠ΅ΠΌ Π΄Π°Π»Π΅ΠΊΠΎΠ·Π°ΡΠ΅Π΄ΡΠ΅ΠΉ ΡΡΠ°Π΄ΠΈΠΈ Π³Π»Π°ΡΠΊΠΎΠΌΡ, Π° ΡΠ°ΠΊΠΆΠ΅ ΠΎΡΠ΅Π½ΠΈΡΡ Π²Π΅ΡΠΎΡΡΠ½ΡΠ΅ ΡΠΈΡΠΊΠΈ ΠΈ Π½Π΅Π±Π»Π°Π³ΠΎΠΏΡΠΈΡΡΠ½ΡΠ΅ ΠΈΡΡ
ΠΎΠ΄Ρ, ΡΠ°ΠΊΠΈΠ΅ ΠΊΠ°ΠΊ ΠΏΡΠΎΠ³ΡΠ΅ΡΡΠΈΡΠΎΠ²Π°Π½ΠΈΠ΅ Π³Π»Π°ΡΠΊΠΎΠΌΡ, ΠΏΠΎΡΠ»Π΅ΠΎΠΏΠ΅ΡΠ°ΡΠΈΠΎΠ½Π½ΠΎΠ΅ ΡΡΠ±ΡΠ΅Π²Π°Π½ΠΈΠ΅, Π³ΠΈΠΏΠΎΡΠΎΠ½ΠΈΡ ΠΈ Π΄ΡΡΠ³ΠΈΠ΅ ΠΎΡΠ»ΠΎΠΆΠ½Π΅Π½ΠΈΡ. Π Π΅Π·ΡΠ»ΡΡΠ°ΡΡ, ΠΏΡΠ΅Π΄ΡΡΠ°Π²Π»Π΅Π½Π½ΡΠ΅ Π² ΠΎΠ±Π·ΠΎΡΠ΅, ΠΏΠΎΠ·Π²ΠΎΠ»ΡΡΡ ΡΠ΄Π΅Π»Π°ΡΡ Π²ΡΠ²ΠΎΠ΄, ΡΡΠΎ ΠΎΠ±ΡΠΈΠ΅ ΠΊΡΠΈΡΠ΅ΡΠΈΠΈ ΡΡΠΏΠ΅Ρ
Π° ΠΌΠΎΠ³ΡΡ ΠΎΠ±Π΅ΡΠΏΠ΅ΡΠΈΡΡ ΠΎΠ΄Π½ΠΎΡΠΎΠ΄Π½ΠΎΡΡΡ Π² Π°ΠΊΠ°Π΄Π΅ΠΌΠΈΡΠ΅ΡΠΊΠΈΡ
ΠΈΡΡΠ»Π΅Π΄ΠΎΠ²Π°Π½ΠΈΡΡ
, Π½ΠΎ Π² ΠΏΠΎΠ²ΡΠ΅Π΄Π½Π΅Π²Π½ΠΎΠΉ ΠΊΠ»ΠΈΠ½ΠΈΡΠ΅ΡΠΊΠΎΠΉ ΠΏΡΠ°ΠΊΡΠΈΠΊΠ΅ ΠΊΠ°ΠΆΠ΄ΡΠΉ Π³Π»Π°ΡΠΊΠΎΠΌΠ°ΡΠΎΠ»ΠΎΠ³ Π΄ΠΎΠ»ΠΆΠ΅Π½ ΠΈΠ½Π΄ΠΈΠ²ΠΈΠ΄ΡΠ°Π»ΡΠ½ΠΎ ΠΏΡΠΈΠ½ΠΈΠΌΠ°ΡΡ ΡΠ΅ΡΠ΅Π½ΠΈΠ΅ Π² ΠΏΠΎΠ»ΡΠ·Ρ ΡΠΎΠ³ΠΎ ΠΈΠ»ΠΈ ΠΈΠ½ΠΎΠ³ΠΎ ΠΌΠ΅ΡΠΎΠ΄Π° Π»Π΅ΡΠ΅Π½ΠΈΡ, ΡΡΠΎΠ±Ρ Π³Π°ΡΠ°Π½ΡΠΈΡΠΎΠ²Π°ΡΡ ΠΎΠΏΡΠΈΠΌΠ°Π»ΡΠ½ΡΠΉ ΡΠ΅Π·ΡΠ»ΡΡΠ°Ρ, ΠΊΠ°ΠΊ Π΄Π»Ρ Π²ΡΠ°ΡΠ°, ΡΠ°ΠΊ ΠΈ, Π΅ΡΡΠ΅ΡΡΠ²Π΅Π½Π½ΠΎ, Π΄Π»Ρ ΠΏΠ°ΡΠΈΠ΅Π½ΡΠ°
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