Search Results
Results 51 - 100 of 1389
1 2 3 4 5 6 7 8 9 10 >
Zhang Geng - - 2012
From scalar Helmholtz integral relation and by coordinate system transformation, this paper begins with a derivation of the far-zone speckle field in the observation plane perpendicular to the scattering direction from an arbitrarily shaped conducting rough object illuminated by a plane wave illumination, followed by the spatial correlation function of ...
Kerimoglu Onur - - 2012
We investigate the effects of algal cell size on the competition for nutrients and light in an incompletely mixed water column, employing a spatially explicit variable internal stores approach and previously published allometric scaling relationships for modeling phytoplankton growth. We analyze the interplay between the size-dependent vertical assimilation and uptake ...
Patwari Pallavi P - - 2012
Introduction:Congenital central hypoventilation syndrome (CCHS) is characterized by alveolar hypoventilation, autonomic nervous system (ANS) dysregulation (ANSD), and mutations in the paired-like homeobox 2B (PHOX2B) gene. ANSD in CCHS affects multiple systems and includes ophthalmologic abnormalities. We hypothesized that quantitative pupil measures, obtained using pupillometry, would vary between cases with CCHS ...
Lüer Larry - - 2012
Energy transfer (ET) between B850 and B875 molecules in light harvesting complexes LH2 and LH1/RC (reaction center) complexes has been investigated in membranes of Rhodopseudomonas palustris grown under high- and low-light conditions. In these bacteria, illumination intensity during growth strongly affects the type of LH2 complexes synthesized, their optical spectra, ...
Laeng Bruno - - 2012
We recorded by use of an infrared eye-tracker the pupil diameters of participants while they observed visual illusions of lightness or brightness. Four original illusions {based on Gaetano Kanisza's [Kanizsa G (1976) Subjective contours. Sci Am 234:48-52] and Akiyoshi Kitaoka's [Kitaoka A. (2005) Trick Eyes (Barnes & Noble, New Providence, ...
Beriat Nilüfer Celebi - - 2012
This study evaluated the sealing ability and push-out bond strength of two luting cements cured with two different types of light curing units (LCU): light-emitting diode (LED) versus quartz tungsten halogen (QTH). Forty teeth were divided into four groups(n=10/group). Quartz fiber posts (D. T. Light-Post) were luted to coronal or ...
Herbst Kristina - - 2012
The activity of melanopsin containing intrinsically photosensitive ganglion retinal cells (ipRGC) can be assessed by a means of pupil responses to bright blue (appr.480 nm) light. Due to age related factors in the eye, particularly, structural changes of the lens, less light reaches retina. The aim of this study was ...
Sch Ttner Konrad - - 2011
Djungarian hamsters (Phodopus sungorus) bred at the Institute of Halle reveal three different circadian phenotypes. The wild type (WT) shows normal locomotor activity patterns, whereas in hamsters of the DAO (delayed activity onset) type, the activity onset is continuously delayed. Since the activity offset in those hamsters remains coupled to ...
Krug Stefanie - - 2011
The circadian mutation duper in Syrian hamsters shortens the free-running circadian period (τ(DD)) by 2 hours when expressed on a tau mutant (τ(ss)) background and by 1 hour on a wild-type background. We have examined the effects of this mutation on phase response curves and entrainment. In contrast to wild ...
Gannon Robert L - - 2011
Light-induced phase shifts of hamster circadian activity rhythms are modulated by GABA(B) receptors. Recently, positive allosteric modulators (PAM)s at GABA(B) receptors were described, but it is not known whether they affect light-induced entrainment of circadian rhythms. Therefore, we studied the effects of two GABA(B) PAMs, GS39783 and RacBHFF, upon light-induced ...
Evans Jennifer A - - 2011
The endogenous circadian pacemaker of mammals is synchronized to the environmental day by the ambient cycle of relative light and dark. The present studies assessed the actions of light in a novel circadian entrainment paradigm where activity rhythms are bifurcated following exposure to a 24-h light:dark:light:dark (LDLD) cycle. Bifurcated entrainment ...
Lorelli Christina J - - 2011
Disruptions of circadian rhythms have been linked to a wide range of pathologies from sleep disorders to cancer. The extent to which disruptions of circadian rhythms during development contribute to later conditions is not known. The present study tested the hypothesis that functional properties of the central circadian pacemaker, the ...
Xiang Quanjun - - 2011
Nitrogen self-doped TiO(2) nanosheets with exposed {001} facets (ca. 67%) were synthesized by solvothermal treatment of TiN in a HNO(3)-HF ethanol solution and exhibited much higher visible-light photocatalytic H(2)-production activity than nitrogen doped TiO(2) microcrystallites with exposed {001} facets (ca. 60%) by a factor of 4.1.
Shao Fang - - 2011
We demonstrate here to synthesize a hierarchical TiO2 architecture without any surfactants or templates. Two kinds of structure existed simultaneously, the ordered nanoarrays at bottom provided direct conduction pathways for photogenerated electrons while the upper micro-flowers consisted of nanobelt building units increased the light harvesting ability as the scattering part. ...
Cheng Hefeng - - 2011
A novel Ag/AgBr/BiOBr hybrid was prepared by a rational in situ ion exchange reaction between BiOBr hierarchical microspheres and AgNO(3) in ethylene glycol followed by light reduction, which displayed superior visible light driven photocatalytic activities in sterilization of pathogenic organism and degradation of organic dye compared to N-doped P25.
Liu Haibei - - 2011
Carbon modified vanadium doped TiO2 was successfully prepared with the intention of enhancing the visible light photocatalytic performance by expanding the absorption in the visible light region and improving the quantum efficiency of the photocatalytic reaction. The physicochemical properties of the catalysts were characterized by XRD, Raman, TEM, XPS, UV-vis ...
Kim Do Young - - 2011
Low-cost hybrid up-conversion devices with infrared sensitivity to 1.5 μm were obtained by integrating a colloidal PbSe nanocrystal near-infrared sensitizing layer on a green phosphorescent organic light emitting diode. A ZnO nanocrystal hole blocking layer is incorporated in the devices for keeping the device off in the absence of IR ...
Kuo Yu-Lin - - 2011
An optimal condition applied to the Taguchi method with an L(9) orthogonal array for preparing a visible-light driven nitrogen-modified TiO(2) (N-TiO(2)) photocatalyst by a simple hydrolysis method has been examined for material characteristics and a photodecolorization test of methyl blue (MB) under various visible light source (fluorescent and blue LED ...
Ding Xing - - 2011
In this study, we demonstrate that aerosol assisted flow synthesized B, N-codoped TiO(2) photocatalyst possesses superior photocatalytic activity to pure and single element doped counterparts on the degradation of NO in a flow system under both simulated solar light and visible light irradiation. Characterization results revealed that B, N-codoped TiO(2) ...
Wang Xinyi - - 2011
We developed a new simple and sensitive assay for lysozyme based on gold nanoparticle plasmon resonance light scattering (PRLS) measurement and naked-eye detection using for the first time the lysozyme DNA aptamer as the recognition element. Lysozyme DNA aptamer could stabilize gold nanoparticles (AuNPs) at high ionic strength. Introducing lysozyme ...
Cheng Kai-Yuan - - 2011
We demonstrate highly efficient electroluminescence from silicon nanocrystals (SiNCs). In an optimized nanocrystal-organic light-emitting device, peak external quantum efficiencies of up to 8.6% can be realized with emission originating solely from the SiNCs. The high efficiencies reported here demonstrate for the first time that with an appropriate choice of device ...
Zhang Yu - - 2011
A nanocup, or semishell, is an asymmetric plasmonic "Janus" nanoparticle with electric and magnetic plasmon modes; the latter scatters light in a direction controlled by nanoparticle orientation, making it the nanoscale analog of a parabolic antenna. Here we report a method for transferring nanocups from their growth substrate to oxide-terminated ...
Xi Guangcheng - - 2011
A facile solvothermal epitaxial growth combined with a mild oxidation route has been developed for the fabrication of a magnetically recyclable Fe(3) O(4) /WO(3) core-shell visible-light photocatalyst. In this core-shell structured photocatalyst, visible-light-active WO(3) nanoplates (the shells) with high surface area are used as a medium to harvest absorbed photons ...
Chandramohan S - - 2011
This Letter reports on the fabrication of hybrid white-light-emitting diodes made of semiconductor nanocrystals (NCs) integrated on InGaN/GaN LEDs. Using core type and core/shell type CdSe NCs, the white light properties are systematically engineered for white light generation with high color rendering index (CRI). Unlike CdSe/ZnS core/shell NCs, which exhibited ...
Starr Francis W - - 2011
We investigate the impact of nanoparticles (NP) on the fragility and cooperative stringlike motion in a model glass-forming polymer melt by molecular dynamics simulation. The NP cause significant changes to both the fragility and the average length of stringlike motion, where the effect depends on the NP-polymer interaction and NP ...
Hou Jungang - - 2011
TaON modified by polyaniline (PANI), was prepared through a facile chemisorption process. PANI-modified TaON composites with good stabilities exhibit significantly higher photocatalytic activities than that of neat TaON on degradation of RhB under visible light irradiation, which may result from an enhancement of electron-hole separation between PANI and TaON.
Gineste J-M - - 2011
The forward scattering of light in a conventional inverted optical microscope by nanoparticles ranging in diameter from 10 to 50 nm has been used to automatically and quantitatively identify and track their location in three-dimensions with a temporal resolution of 200 ms. The standard deviation of the location of nominally stationary 50-nm-diameter ...
Miao Xiangmin - - 2011
A dynamic light scattering sensor for Pb(2+) was constructed with oligonucleotide-modified gold nanoparticles based upon its cleavage property for DNAzyme.
Lipovsky Anat - - 2011
In recent years nano-metaloxides which easily penetrate into the cells with special interest due to their higher chemical reactivity as compared to that of similar materials in the bulk form. Of particular interest are nano-TiO(2) and ZnO, which have been widely used for their bactericidal and anticancerous properties. The aim ...
Dukes Albert D - - 2011
We report the observation of broad-spectrum fluorescence from single CdSe nanocrystals. Individual semiconductor nanocrystals typically have a narrower emission spectrum than that of an ensemble. However, our experiments show that the ensemble white-light emission observed in ultrasmall CdSe nanocrystals is the result of many single CdSe nanocrystals, each emitting over ...
Volpe Giorgio - - 2011
Plasmonic nanostructures offer a great potential to enhance light-matter interaction at the nanometer scale. The response upon illumination at a given wavelength and polarization is governed by the characteristic lengths associated to the shape and size of the nanostructure. Here, we propose the use of engineered fractal plasmonic structures to ...
Ham Hyo Kyun - - 2011
The enhancement of out-coupling efficiency of organic light emitting diode (OLED) using SiO2-polymer composite layers was investigated. The SiO2-polymer composite was made from a SiO2 nanopowder and commercial UV-hardeners. The composite layer was coated on glass by dip-coating method in a SiO2 suspension, followed by spin-coating of 1 microm thick ...
Liu Hailong - - 2011
We investigate the light transmission properties of double-overlapped annular apertures in a silver film with the three-dimensional finite-difference time-domain method. It has been found that the transmission peaks are attributed to the localized surface plasmon resonance (LSPR) of nanocavities and the surface plasmon polaritons (SPPs) of the nanoparticles. The peaks ...
Meng Lijian - - 2011
For the first time, the TiO2 nanorod arrays have been prepared on ITO substrates at room temperature by dc reactive magnetron sputtering technique. These TiO2 nanorods have a preferred orientation along the (220) direction and are perpendicular to the ITO substrate. Both the X-ray diffraction and Raman scattering measurements show ...
Babu P - - 2011
The radiative emission properties of the Dy<sup>3+</sup> ions in an oxyfluoride glass and glass-ceramics have been studied for the generation of white light. The x-ray diffraction pattern of the glass-ceramics shows the formation of CaF<sub>2</sub> fluorite-type nanocrystals in the glass matrix after a suitable thermal treatment of the precursor glass, ...
Zhang Quanxin - - 2011
At present, the photovoltaic performance of quantum dot-sensitized solar cells (QDSCs) is still much lower than conventional DSCs. Appropriate porous TiO(2) photoanodes for QDSCs need to be further investigated, and optimization of the nanoparticle-based photoanodes is highly desirable as well. In this article, the influence of the structural properties of ...
Dong Fan - - 2011
C-doped TiO(2) nanoparticles prepared by partial oxidation of TiC were modified with Pt species by impregnation-calcination method in order to enhance the visible light photocatalytic activity. The physicochemical properties of as-prepared samples were characterized by various techniques in detail. The results indicated that a novel Pt/C-doped TiO(2)/PtCl(4) three-component nanojunction system ...
Dai Lei - - 2011
We propose a compound system consisting of a dielectric grating and a plasmonic resonance cavity embedded in the grating. Based on the interference effect between the surface mode supported by the dielectric grating and the plasmonic-induced cavity mode, this system could achieve slow light with group index more than 200 ...
Knežević Nikola Ž - - 2011
A supramolecular assembly for visible light responsive release of cargo molecules is presented. Sulforhodamine 101 was loaded inside the mesopores of mercaptopropyl-functionalized mesoporous silica nanoparticles (MP-MSN) and entrapped by mercaptopropyl-coordinated Ru(bpy)(2)(PPh(3))-moieties. Irradiation with visible light triggers the release of capping species and loaded molecules.
Cui Wei - - 2011
Photosensitive nanoparticles (NPs) were fabricated by employing chitosan hydrochloride (CHC) and photosensitive 4-oxo-4-(pyren-4-ylmethoxy) butanoic acid (PYBA) through ionic self-assembly. Transmission electron microscope (TEM) images showed that the average diameter of the complex NPs depended on the charge molar ratio of PYBA to CHC. The photosensitive properties of the NPs were ...
He Zhiqiao - - 2011
I-doped titanium dioxide nanospheres (I-TNSs) were synthesized via a two-step hydrothermal synthesis route, their potential for the efficient utilization of visible light was evaluated. The prepared anatase-phase I-TNSs had a bimodal porous size distribution with a Brunauer-Emmett-Teller surface area of 76 m2/g, a crystallite size of approximately 14 nm calculated ...
Murray Jennifer E - - 2011
Environmental stimuli that co-occur with tobacco use come to evoke drug-related conditioned responses (CRs) that appear involved in continued use of nicotine-containing products. In rats, nicotine can serve as a conditional stimulus (CS) for non-drug unconditioned stimuli (USs), prompting the question of whether the nicotine CS can compete with, or ...
Nelson A J D - - 2011
To examine the effect of dopamine depletion in nucleus accumbens on trace conditioning; to distinguish the role of core and shell sub-regions, as far as possible. 6-hydroxydopamine was used to lesion dopamine terminals within the core and shell accumbens. Experiment 1 assessed conditioning to a tone conditioned stimulus that had ...
Swanton Dale N - - 2011
We have previously demonstrated that rats trained on a two-duration peak procedure in which two modal signals (i.e., tone and houselight) predicted probabilistic reinforcement availability at two times (10 s and 20 s) would respond in a scalar manner at a time between the trained durations in response to the ...
Nissen Claus C Department of Ophthalmology, Glostrup Hospital, University of Copenhagen Copenhagen, - - 2011
To evaluate the influence of the size of the light exposed pupil in one eye on the pupillary light reflex of the other eye. Using a monochromatic pupillometer, the left eye in each of 10 healthy subjects was exposed to 20 s of monochromatic light of luminance 300 cd/m(2), first red (660 nm) ...
Nachmias Jacob - - 2010
Observers presented with pairs of figures differing in area (SIZE) or aspect ratio (SHAPE) spontaneously make use of both height and width differences. whether or not they are forced to do so by between-interval jittering or even instructed to do so. SHAPE discrimination is considerably better than SIZE discrimination. The ...
Rosenblatt Gilad - - 2010
A circular zero-time-averaged power component, coupling the forward (dielectric) and backward (metal) power channels of Surface Plasmon Polaritons (SPPs), is shown to be the core ingredient for the slow-light characteristic of SPPs at the surface plasmon frequency, for both a lossless and lossy metal. Additional slow-light regimes emerging in configurations ...
Adhikari Ravi M - - 2010
Co-precipitation of 1,4-bis(2-phenyl-1-propen-1-yl)benzene (1) and 2-(4-(2-(4-(3,6-di-tert-butyl-9H-carbazol-9-yl)phenyl)ethynyl)benzylidene) malononitrile (2) that individually form blue-emitting and orange-emitting nanoparticles, respectively, results in the formation of composite fluorescent organic nanoparticles that emit white light. The two components likely align in the head-to-tail fashion in nanoparticles, creating two parallel and strongly coupled transition dipoles. The emission ...
Primo Ana - - 2011
This Perspective is focused on the photocatalytic activity of gold nanoparticles supported on titania (Au/TiO(2)). Titania is the most widely used photocatalyst, but its limited activity under visible light irradiation has motivated the quest for modified titania materials absorbing visible light. The review starts by justifying how doping with metallic ...
Dack Charlotte - - 2010
The aim of the four present experiments was to explore how different schedules of reinforcement influence schedule-induced behavior, their impact on evaluative ratings given to conditioned stimuli associated with each schedule through evaluative conditioning, and the transfer of these evaluations through derived stimulus networks. Experiment 1 compared two contrasting response ...
1 2 3 4 5 6 7 8 9 10 >