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991.
Seung Kwon Hong Hye Young Koo You Na Ko Jung Hyun Kim Jang Heui Yi Yun Chan Kang 《Applied Physics A: Materials Science & Processing》2010,98(3):671-677
Eu-doped B2O3–ZnO–PbO glass phosphor powders with spherical shape and fine size were directly prepared by spray pyrolysis. The glass phosphor
powders prepared at a temperature of 1100°C had broad XRD peak at around 28°. One glass phosphor powder was formed from one
droplet at the preparation temperature range from 900 to 1100°C. The mean size of the glass phosphor powders was 0.75 μm.
The glass transition temperature (T
g
) of the glass phosphor powders prepared by spray pyrolysis was 378.5°C. The excitation spectrum of the glass phosphor powders
prepared at the optimum preparation temperature of 1100°C had bands at 362, 381, 392, 463, 525, and 532 nm. The glass phosphor
powders had emission spectra with bands at 579, 614, and 653 nm. The glass phosphor powders with doping concentration of Eu
of 7 wt% had the maximum photoluminescence intensity. The glass phosphor layer formed from the glass phosphor powders had
high transparencies above 90%. 相似文献
992.
Doyle TE Goodrich JB Ambrose BJ Patel H Kwon S Pearson LH 《The Journal of the Acoustical Society of America》2010,128(5):EL229-EL235
Normal and malignant mammary epithelial cells were studied using laboratory measurements, wavelet analysis, and numerical simulations of monolayer cell cultures to determine whether microscopic breast cancer can be detected in vitro with high-frequency ultrasound. Pulse-echo waveforms were acquired by immersing a broadband, unfocused 50-MHz transducer in the growth media of cell culture well plates and collecting the first reflection from the well bottoms. The simulations included a multilayer pulse-reflection model and a model of two-dimensional arrays of spherical cells and nuclei. The results show that normal and malignant cells produce time-domain signals and spectral features that are significantly different. 相似文献
993.
Supercritical carbon dioxide (scCO2) processing was performed with mixtures of CO2-soluble peracetylated-β-cyclodextrin (PAc-β-CD) heptakis(2,3,6-tri-O-acetyl)-β-cyclodextrin, and highly water-soluble drug molsidomine (MOL) to prepare inclusion complexes of MOL and PAc-β-CD. The MOL/PAc-β-CD inclusion complex was confirmed by differential scanning calorimetry, X-ray diffractometry, and 1H NMR analyses. The complexes were further investigated for their potential use in controlled drug delivery applications. The in-vitro release of MOL from the peanut oil suspensions into aqueous phase was found to be significantly retarded by the complexation with PAc-β-CD, mainly due to the hydrophobic properties associated with the PAc-β-CD. 相似文献
994.
Kwon MS 《Optics letters》2010,35(22):3835-3837
This Letter theoretically proposes and investigates an integrated plasmonic sensor that is based on a grating-assisted coupling between a surface plasmon polariton (SPP) and a dielectric waveguide (DW) mode. It consists of a glass slide with a gold film for the propagation of an SPP and a separate DW with a long-period grating. For sensing, the two parts are temporarily combined. After sensing, the former is replaceable, and so the sensor has disposability. The design procedure and analysis method for the sensor are explained. The designed sensor is shown to be very compact. Its characteristics of sensing a change of the refractive index of liquid are analyzed and discussed. 相似文献
995.
Jun‐Gill Kang Jung‐Pyo Hong Sung Kwon Kang 《Acta Crystallographica. Section C, Structural Chemistry》2000,56(10):e432-e433
In the title compound, Na+·C6H8NO6?·2H2O, the sodium ion is coordinated in a distorted octahedral manner by two carboxylate O atoms and two water O atoms. Each of these water molecules bridges two adjacent Na ions, resulting in two four‐membered rings of the type Na–O–Na–O. 相似文献
996.
Yunghee Oh Byoung‐Chul Shin Dale Swenson Harold M. Goff Sung Kwon Kang 《Acta Crystallographica. Section C, Structural Chemistry》2004,60(2):m57-m59
The title compound, [Fe(C44H8F20N4)]·2C6H6, contains a four‐coordinated FeII atom, which lies on a center of symmetry. The porphyrin macrocycle is planar, and the Fe—N bond distances are in the range 1.9891 (13)–1.9982 (13) Å. The spin state of the FeII atom is intermediate (S = 1), as confirmed by NMR spectroscopy. The asymmetric unit contains two half benzene molecules, each lying about an independent inversion centre; one of the benzene rings is located just below (and by inversion symmetry, another is just above) the Fe atom, where it interacts weakly with the porphyrin ring. 相似文献
997.
This paper introduces explicit conditions for some natural family of polynomials to define Pisot or Salem numbers, and reviews
related topics as well as their references. 相似文献
998.
Structure—Activity Relationships of the Peptide Ile-Ala-Val-Pro and Its Derivatives Revealed Using the Semi-Empirical AM1 Method 总被引:1,自引:0,他引:1
Several peptides with hypocholesterinemic properties were investigated in order to reveal structure-activity relationships.
The semi-empirical AM1 method and molecular dynamics were used to determine common structural properties of these peptides.
A mathematical model of the structure-activity relationship was obtained. According to this model, a hydrophobic part of these
peptides is a required structural element for their biological activity. The proline acts as a key component in these compounds.
__________
Translated from Khimiya Prirodnykh Soedinenii, No. 4, pp. 367–372, July–August, 2005. 相似文献
999.
Yun‐Hi Kim Qinghua Zhao Soon‐Ki Kwon 《Journal of polymer science. Part A, Polymer chemistry》2006,44(1):172-182
The copolymers that are composed of poly(fluorene) (PF), poly(p‐phenylene), and Poly(p‐phenylenevinylene) as backbone and a large 4′‐(N,N′‐diphenylamino)diphenyl or 4′‐(N,N′‐diphenylamino)phenyl as pendent group were synthesized by the nickel(0)‐mediated polycoupling. The composition of the obtained copolymers was confirmed by H NMR. All the copolymers possessed a high weight‐average molecular weight and good solubility in common organic solvents. As the content of triphenyl amine pendants increases, the copolymers showed increased thermal stability due to increased glass transition temperature and increased hole injection ability because of decreased onset of the oxidation potential. In the photoluminescence spectra of copolymers, poly (BDAV30‐co‐DHF70) and poly(BDAPV30‐co‐DHF70) showed efficient energy transfer. indium tin oxide/poly(styrene sulfonate)‐doped poly(3,4‐ethylene dioxythiophene)/poly (BDAV30‐co‐DHF70)/LiF/Al device showed maximum brightness of 2267 cd/m2 and efficiency of 0.80 cd/A, with turn‐on voltage at 9.1 V. © 2005 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 44: 172–182, 2006 相似文献
1000.
Si1−xMnx diluted magnetic semiconductor (DMS) bulks were formed by using an implantation and annealing method. Energy dispersive X-ray fluorescence, transmission electron microscopy (TEM), and double-crystal rocking X-ray diffraction (DCRXD) measurements showed that the grown materials were Si1−xMnx crystalline bulks. Hall effect measurements showed that annealed Si1−xMnx bulks were p-type semiconductors. The magnetization curve as a function of the magnetic field clearly showed that the ferromagnetism in the annealed Si1−xMnx bulks originated from the interaction between interstitial and substitutional Mn+ ions, which was confirmed by the DCRXD measurements. The magnetization curve as a function of the temperature showed that the ferromagnetic transition temperature was approximately 75 K. The present results can help to improve understanding of the formation mechanism of ferromagnetism in Si1−xMnx DMS bulks. 相似文献