Thermal radiation and optical properties of cubic zirconia stabilised with yttria up to the temperature of high rate evaporation

2002 ◽  
Vol 34 (6) ◽  
pp. 657-668 ◽  
Author(s):  
Vadim Petrov ◽  
Aleksey Vorobyev ◽  
Aleksander Chernyshev
Keyword(s):  
Optical Properties ◽  
Thermal Radiation ◽  
High Rate ◽  
Cubic Zirconia

Physical a priori solar radiation pressure models for GNSS satellites with the focus on BDS

2021 ◽  
Author(s):  
Bingbing Duan ◽  
Urs Hugentobler ◽  
Inga Selmke ◽  
Stefan Marz
Keyword(s):  
Optical Properties ◽  
Solar Radiation ◽  
Thermal Radiation ◽  
Radiation Pressure ◽  
Total Mass ◽  
A Priori ◽  
Solar Radiation Pressure ◽  
The Other ◽  
Time Range ◽  
Satellite Attitude

<p>A physical a priori box-wing solar radiation pressure (SRP) model is widely used by most analysis centers for Galileo and QZSS (Quasi-Zenith Satellite System) satellites, complemented by an ECOM or ECOM2 (Empirical CODE Orbit Model) model. For the other constellations, for instance GPS and GLONASS satellites, optical properties of satellite surfaces are not publicly available, especially for GPS Block IIF and GLONASS satellites. By fixing satellite surface areas and total mass to the values from some unpublished documents, we estimate satellite surface optical properties based on true GNSS measurements covering long time periods (typically this should be longer than a full beta angle time range to reduce correlations between parameters). Meanwhile, various physical effects are considered, such as yaw bias, radiator emission and thermal radiation of solar panels. We find that yaw bias of GPS Block IIA and IIR satellites does not dominate the Y-bias, it is likely that heat generated in the satellite is radiated from louvers or heat pipes on the Y side of the satellite. It is also noted that the ECOM Y0 estimates of both GPS and GLONASS satellites show clear anomaly during eclipse seasons. This indicates that the radiator emission is present when the satellite crosses shadows. Since satellite attitude during eclipse seasons could be different from the nominal yaw, potential radiator effect in the –X surface could be wrongly absorbed by the ECOM Y0 as well. By considering all the estimated parameters in an a priori model we observe clear improvement in satellite orbits, especially for GLONASS satellites. China’s Beidou-3 satellites are now providing PNT (positioning, navigation and timing) service globally. Satellite attitude, dimensions and total mass are publicly available. Also, the absorption optical properties of each satellite surface are given. With all this information, we estimate the other optical properties of Beidou satellites considering similar yaw bias, radiator and thermal radiation effects as those in GPS and GLONASS satellites.</p>

Sol–Gel Assisted Isotropic Morphological Progression in Nanostructured MoO3 and Allied Investigations on Photocatalytic Dye-Degradation

2019 ◽  
Vol 19 (6) ◽  
pp. 3479-3486 ◽  
Author(s):  
Nilam Qureshi ◽  
Manish Shinde ◽  
Sudhir Arbuj ◽  
Sunit Rane ◽  
Anand Bhalerao ◽  
...  
Keyword(s):  
Methylene Blue ◽  
Optical Properties ◽  
Photocatalytic Degradation ◽  
Rate Constants ◽  
Dye Degradation ◽  
Sol Gel ◽  
High Rate ◽  
Photocatalytic Dye Degradation ◽  
Gel Technique ◽  
Synthesis Protocol

We report tunable-morphology oriented facile yet scalable route to synthesize 1D (nanorod) and 2D (nanobelt) MoO3 nanostructures at gram scale using conventional as well as sonochemistry assisted sol–gel technique. The structural, morphological and optical properties of the samples can be befittingly altered by varying the synthesis protocol. The resultant orthorhombic MoO3 nanomorphs demonstrated efficient and expeditious photocatalytic degradation of the pollutant dye, Methylene Blue (MB). We have observed that appreciable photocatalytic MB dye-degradation can be accomplished within 30 minutes with high rate constants of 0.0786 min−1 and 0.233 min−1 for rod and belt-like MoO3-nanostructures, respectively. The pilot results indicate that the resultant MoO3 nanomorphs can be potentially used as solar light driven industrial photocatalyst material with their intrinsic photostability.

Interesting optical properties of films composed of very small grains formed from a high-rate nanoparticle beam

1999 ◽  
Vol 355-356 ◽  
pp. 513-517 ◽  
Author(s):  
F.K Urban ◽  
A Hosseini-Tehrani ◽  
A Khabari ◽  
P Griffiths ◽  
G Fernandez
Keyword(s):  
Optical Properties ◽  
High Rate ◽  
Small Grains

scholarly journals In Vitro Determination of Concentration-Dependent Optical Properties of Hemoglobin

2018 ◽  
Vol 4 (1) ◽  
pp. 673-676
Author(s):  
Philipp Wegerich ◽  
Gehring Hartmut
Keyword(s):  
Machine Learning ◽  
Optical Properties ◽  
Layer Thickness ◽  
Internal Standard ◽  
High Rate ◽  
Integrating Sphere ◽  
Learning Approaches ◽  
Rate Data ◽  
Data Set

AbstractThe interest of this paper is the determination of the optical properties of oxygenated (saturation above 97 %) hemoglobin in clinical relevant concentrations (ranging from 5 to 15 g/dl), dependent on the layer thickness. Furthermore the generation of a high rate data set for training with machine learning approaches was intended. With a double integrating sphere setup (laser diodes from 780 to 1310 nm) - as a well referenced method - and flow through optical cuvettes ranging from 1 to 3 mm layer thickness, the transmission (𝑀𝑇) and reflection (𝑀𝑅) values of the samples were acquired. From those the layer thickness independent absorption (𝜇𝑎) and reduced scattering coefficients (𝜇𝑠’) were calculated by the means of the Inverse Adding Doubling (IAD) algorithm. For each sample the same coefficients should result correspondingly for all cuvette thicknesses in test. This relationship serves as an internal standard in the evaluation of the collected data sets. In parallel a spectrophotometer in the range from 690 to 1000 nm recorded transmission spectra for all samples as a second reference. First, the IAD algorithm provided optical coefficients (𝜇𝑎, 𝜇𝑠’) in all measurements, with few exceptions at low hemoglobin concentrations. The resulting coefficients match independently of the layer thickness. As a main second result, a high rate data set was generated which serves for further analysis - for example with machine learning approaches.

Mode-selective thermal radiation from a microsphere as a probe of optical properties of high-temperature materials

2017 ◽  
Vol 95 (6) ◽  
Author(s):  
R. Morino ◽  
H. Tajima ◽  
H. Sonoda ◽  
H. Kobayashi ◽  
R. Kanamoto ◽  
...  
Keyword(s):  
Optical Properties ◽  
High Temperature ◽  
Thermal Radiation ◽  
High Temperature Materials

Optical Properties and Microstructure of Nanocrystalline Cubic Zirconia Prepared by High-Pressure Spark Plasma Sintering

2011 ◽  
Vol 94 (9) ◽  
pp. 2981-2986 ◽  
Author(s):  
Haibin Zhang ◽  
Byung-Nam Kim ◽  
Koji Morita ◽  
Hidehiro Yoshida ◽  
Jae-Hyuk Lim ◽  
...  
Keyword(s):  
High Pressure ◽  
Optical Properties ◽  
Spark Plasma Sintering ◽  
Cubic Zirconia ◽  
Plasma Sintering ◽  
Spark Plasma

Microstructure and optical properties of AlOx thin films grown on ZnO-deposited glass

2003 ◽  
Vol 18 (8) ◽  
pp. 1943-1949 ◽  
Author(s):  
Su-Shia Lin ◽  
Jow-Lay Huang
Keyword(s):  
Thin Films ◽  
Optical Properties ◽  
Film Growth ◽  
Processing Parameters ◽  
High Rate ◽  
Excess Oxygen ◽  
Glass Substrates ◽  
Oxygen Oxygen ◽  
High Kinetic Energy ◽  
Polycrystalline Structures

AlOx thin films were grown on ZnO-deposited glass substrates under different conditions using magnetron sputtering. The influence of processing parameters (mainly direct-current power and oxidizing atmosphere) on the structure and optical properties were investigated. The AlOx films for all samples in this study showed the coexistence of amorphous and polycrystalline structures. The kinetics of crystal growth could influence the dominant crystal orientation. Fast-growing planes were not the most thermodynamically stable, but were kinetically controlled under the film growth condition. Oxidizing the sample in O2 atmosphere made the AlOx film grow in random directions. The excess oxygen was chemisorbed at the interface between AlOx and ZnO. Therefore, the neighboring oxygen–oxygen distance of AlOx and that of ZnO on their closest-packed planes seriously mismatched. At high power, the particles arrived at the substrate with high kinetic energy and high rate, which led to low density due to porous structure. The transmission decreased with an increase of the pores and surface roughness of AlOxfilm on ZnO-deposited glass. However, the diffusion of oxygen into the grains improved transmission when the sample was oxidized in O2 atmosphere.

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