scholarly journals Review of the manuscript: Explicit and consistent aerosol correction for visible wavelength satellite cloud and nitrogen dioxide retrievals based on optical properties from a global aerosol analysis, by Vasilkov et al.

2020 ◽  
Author(s):  
Anonymous
Keyword(s):  
Optical Properties ◽  
Nitrogen Dioxide ◽  
Visible Wavelength ◽  
Aerosol Analysis

scholarly journals Upconversion nanoparticle as a theranostic agent for tumor imaging and therapy

2016 ◽  
Vol 09 (04) ◽  
pp. 1630006 ◽  
Author(s):  
Wenkai Fang ◽  
Yanchun Wei
Keyword(s):  
Optical Properties ◽  
Tumor Imaging ◽  
Promising Material ◽  
Upconversion Nanoparticles ◽  
Multiphoton Absorption ◽  
Long Wavelength ◽  
Visible Wavelength ◽  
Theranostic Agent ◽  
Challenges And Opportunities ◽  
Wavelength Light

Upconversion nanoparticles (UCNPs) as a promising material are widely studied due to their unique optical properties. The material can be excited by long wavelength light and emit visible wavelength light through multiphoton absorption. This property makes the particles highly attractive candidates for bioimaging and therapy application. This review aims at summarizing the synthesis and modification of UCNPs, especially the applications of UCNPs as a theranostic agent for tumor imaging and therapy. The biocompatibility and toxicity of UCNPs are also further discussed. Finally, we discuss the challenges and opportunities in the development of UCNP-based nanoplatforms for tumor imaging and therapy.

Enhanced nonlinear optical properties of graphene oxide–silver nanocomposites measured by Z-scan technique

RSC Advances ◽  
2016 ◽  
Vol 6 (13) ◽  
pp. 10319-10325 ◽  
Author(s):  
S. Biswas ◽  
A. K. Kole ◽  
C. S. Tiwary ◽  
P. Kumbhakar
Keyword(s):  
Optical Properties ◽  
Graphene Oxide ◽  
Optical Property ◽  
Nonlinear Optical ◽  
Nonlinear Optical Property ◽  
Optical Limiting ◽  
Visible Wavelength ◽  
Silver Nanocomposites ◽  
Optical Limiting Effect ◽  
532 Nm

Enhanced (by ∼2.8) nonlinear optical property of GO–Ag nanocomposite has been reported by Z-scan technique at a visible wavelength of 532 nm. The synthesized GO–Ag nanocomposite is also displaying significant optical limiting effect.

Optical properties of AgI/Ag infrared hollow fiber in the visible wavelength region

2008 ◽  
Vol 33 (4) ◽  
pp. 318 ◽  
Author(s):  
Ke-Rong Sui ◽  
Yi-Wei Shi ◽  
Xiao-Li Tang ◽  
Xiao-Song Zhu ◽  
Katsumasa Iwai ◽  
...  
Keyword(s):  
Optical Properties ◽  
Hollow Fiber ◽  
Wavelength Region ◽  
Visible Wavelength

scholarly journals Explicit and consistent aerosol correction for visible wavelength satellite cloud and nitrogen dioxide retrievals based on optical properties from a global aerosol analysis

2021 ◽  
Vol 14 (4) ◽  
pp. 2857-2871
Author(s):  
Alexander Vasilkov ◽  
Nickolay Krotkov ◽  
Eun-Su Yang ◽  
Lok Lamsal ◽  
Joanna Joiner ◽  
...  
Keyword(s):  
Optical Properties ◽  
Northeastern China ◽  
Ozone Monitoring Instrument ◽  
Current Standard ◽  
Bidirectional Reflectance ◽  
Aerosol Analysis ◽  
Ozone Monitoring ◽  
Implicit And Explicit ◽  
Aerosol Effects

Abstract. We discuss an explicit and consistent aerosol correction for cloud and NO2 retrievals that are based on the mixed Lambertian-equivalent reflectivity (MLER) concept. We apply the approach to data from the Ozone Monitoring Instrument (OMI) for a case study over northeastern China. The cloud algorithm reports an effective cloud pressure, also known as cloud optical centroid pressure (OCP), from oxygen dimer (O2−O2) absorption at 477 nm after determining an effective cloud fraction (ECF) at 466 nm. The retrieved cloud products are then used as inputs to the standard OMI NO2 algorithm. A geometry-dependent Lambertian-equivalent reflectivity (GLER), which is a proxy of surface bidirectional reflectance, is used for the ground reflectivity in our implementation of the MLER approach. The current standard OMI cloud and NO2 algorithms implicitly account for aerosols by treating them as nonabsorbing particulate scatters within the cloud retrieval. To explicitly account for aerosol effects, we use a model of aerosol optical properties from a global aerosol assimilation system and radiative transfer computations. This approach allows us to account for aerosols within the OMI cloud and NO2 algorithms with relatively small changes. We compare the OMI cloud and NO2 retrievals with implicit and explicit aerosol corrections over our study area.

Multi-NIR-Emissive Materials based on Heterolanthanide Molecular Assemblies

MRS Advances ◽  
2016 ◽  
Vol 1 (38) ◽  
pp. 2683-2688
Author(s):  
Flavia Artizzu ◽  
Francesco Quochi ◽  
Luciano Marchiò ◽  
Michele Saba ◽  
Angela Serpe ◽  
...  
Keyword(s):  
Optical Properties ◽  
Metal Distribution ◽  
Molecular Entity ◽  
Central Position ◽  
Silica Glasses ◽  
Visible Wavelength ◽  
Coordination Sites ◽  
Molecular Speciation ◽  
Templating Effect ◽  
Molecular Framework

ABSTRACTErxYb(3-x)Q9 (1, x = 1, 2), NdYb2Q9 (2), NdEr2Q9 (3) and NdErYbQ9 (4), have been obtained through a simple molecular strategy, by controlling reactant stoichiometry. In 2-4, the templating effect of the molecular framework allows to control the metal distribution across the coordination sites where the central position is occupied by the larger Nd ion and the terminal ones by the almost vicariants Yb3+ and Er3+, drastically reducing molecular speciation. Remarkably, 4 represents the first example of a discrete molecular entity containing three different Ln ions simultaneously emitting in three different spectral regions in the NIR, upon single visible wavelength excitation. Highly transparent and homogeneous doped silica glasses have been prepared, which show the same optical properties of the incorporated complex in solution.

scholarly journals Explicit and consistent aerosol correction for visible wavelength satellite cloud and nitrogen dioxide retrievals based on optical properties from a global aerosol analysis

2020 ◽  
Author(s):  
Alexander Vasilkov ◽  
Nickolay Krotkov ◽  
Eun-Su Yang ◽  
Lok Lamsal ◽  
Joanna Joiner ◽  
...  
Keyword(s):  
Optical Properties ◽  
Cloud Fraction ◽  
Ozone Monitoring Instrument ◽  
Current Standard ◽  
Bidirectional Reflectance ◽  
Aerosol Analysis ◽  
Ozone Monitoring ◽  
Implicit And Explicit ◽  
Aerosol Effects

Abstract. We discuss an explicit and consistent aerosol correction for cloud and NO2 retrievals that are based on the mixed Lambertian-equivalent reflectivity (MLER) concept. We apply the approach to data from the Ozone Monitoring Instrument (OMI) for a case study over norththeast Asia. The cloud algorithm reports an effective cloud pressure, also known as cloud optical centroid pressure (OCP), from oxygen dimer (O2–O2) absorption at 477 nm after determining an effective cloud fraction (ECF) at 466 nm. The retrieved cloud products are then used as inputs to the standard OMI NO2 algorithm. A geometry-dependent Lambertian-equivalent reflectivity (GLER), which is a proxy of surface bidirectional reflectance, is used for the ground reflectivity in our implementation of the MLER approach. The current standard OMI cloud and NO2 algorithms implicitly account for aerosols by treating them as non-absorbing particulate scatters within the cloud retrieval. To explicitly account for aerosol effects, we use a model of aerosol optical properties from a global aerosol assimilation system and radiative transfer computations. This approach allows us to account for aerosols within the OMI cloud and NO2 algorithms with relatively small changes. We compare the OMI cloud and NO2 retrievals with implicit and explicit aerosol corrections over our study area.

Design of objective lens for 200-kV high-resolution electron microscopes

1983 ◽  
Vol 41 ◽  
pp. 314-315
Author(s):  
K. Tsuno ◽  
T. Honda ◽  
Y. Harada ◽  
M. Naruse
Keyword(s):  
Optical Properties ◽  
Computer Technology ◽  
Axial Magnetic Field ◽  
Chromatic Aberration ◽  
Objective Lens ◽  
Resolution Electron ◽  
Correction Of Astigmatism ◽  
Three Stages ◽  
Electron Microscopes ◽  
Stage 1

Developement of computer technology provides much improvements on electron microscopy, such as simulation of images, reconstruction of images and automatic controll of microscopes (auto-focussing and auto-correction of astigmatism) and design of electron microscope lenses by using a finite element method (FEM). In this investigation, procedures for simulating the optical properties of objective lenses of HREM and the characteristics of the new lens for HREM at 200 kV are described.The process for designing the objective lens is divided into three stages. Stage 1 is the process for estimating the optical properties of the lens. Firstly, calculation by FEM is made for simulating the axial magnetic field distributions Bzc of the lens. Secondly, electron ray trajectory is numerically calculated by using Bzc. And lastly, using Bzc and ray trajectory, spherical and chromatic aberration coefficients Cs and Cc are numerically calculated. Above calculations are repeated by changing the shape of lens until! to find an optimum aberration coefficients.

Optical Properties of HVEM Accelerators

1975 ◽  
Vol 33 ◽  
pp. 180-181
Author(s):  
A. Strojnik ◽  
J.W. Scholl ◽  
V. Bevc
Keyword(s):  
Optical Properties ◽  
Electron Accelerator ◽  
Systematic Investigation ◽  
Electron Source ◽  
High Brightness ◽  
The Past ◽  
Wide Range ◽  
Optical Behavior

The electron accelerator, as inserted between the electron source (injector) and the imaging column of the HVEM, is usually a strong lens and should be optimized in order to ensure high brightness over a wide range of accelerating voltages and illuminating conditions. This is especially true in the case of the STEM where the brightness directly determines the highest resolution attainable. In the past, the optical behavior of accelerators was usually determined for a particular configuration. During the development of the accelerator for the Arizona 1 MEV STEM, systematic investigation was made of the major optical properties for a variety of electrode configurations, number of stages N, accelerating voltages, 1 and 10 MEV, and a range of injection voltages ϕ0 = 1, 3, 10, 30, 100, 300 kV).

The Effect of Vitamin A on the Intermittent Nitrogen Dioxide Gas Exposure in Hamsters

1976 ◽  
Vol 34 ◽  
pp. 176-177
Author(s):  
J.C.S. Kim ◽  
M.G. Jourden ◽  
E.S. Carlisle
Keyword(s):  
Electron Microscopy ◽  
Vitamin A ◽  
Nitrogen Dioxide ◽  
Chronic Exposure ◽  
Light And Electron Microscopy ◽  
Specific Effect ◽  
Deficient Diet ◽  
Intermittent Exposure ◽  
Hypovitaminosis A ◽  
Gas Exposure

Chronic exposure to nitrogen dioxide in rodents has shown that injury reaches a maximum after 24 hours, and a reparative adaptive phase follows (1). Damage occurring in the terminal bronchioles and proximal portions of the alveolar ducts in rats has been extensively studied by both light and electron microscopy (1).The present study was undertaken to compare the response of lung tissue to intermittent exposure to 10 ppm of nitrogen dioxide gas for 4 hours per week, while the hamsters were on a vitamin A deficient diet. Ultrastructural observations made from lung tissues obtained from non-gas exposed, hypovitaminosis A animals and gas exposed animals fed a regular commercially prepared diet have been compared to elucidate the specific effect of vitamin A on nitrogen dioxide gas exposure. The interaction occurring between vitamin A and nitrogen dioxide gas has not previously been investigated.

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