Improving selective thermal emission properties of three-dimensional macroporous silicon through porosity tuning

2008 ◽  
Vol 93 (8) ◽  
pp. 081913 ◽  
Author(s):  
M. Garín ◽  
T. Trifonov ◽  
A. Rodríguez ◽  
R. Alcubilla ◽  
F. Marquier ◽  
...  
Keyword(s):  
Thermal Emission ◽  
Three Dimensional ◽  
Macroporous Silicon ◽  
Emission Properties

scholarly journals Infrared thermal emission in macroporous silicon three-dimensional photonic crystals

2007 ◽  
Vol 91 (18) ◽  
pp. 181901 ◽  
Author(s):  
M. Garín ◽  
T. Trifonov ◽  
A. Rodríguez ◽  
R. Alcubilla
Keyword(s):  
Photonic Crystals ◽  
Thermal Emission ◽  
Three Dimensional ◽  
Macroporous Silicon

Enhancement and suppression of thermal emission by a three-dimensional photonic crystal

2000 ◽  
Vol 62 (4) ◽  
pp. R2243-R2246 ◽  
Author(s):  
Shawn-Yu Lin ◽  
J. G. Fleming ◽  
E. Chow ◽  
Jim Bur ◽  
K. K. Choi ◽  
...  
Keyword(s):  
Photonic Crystal ◽  
Thermal Emission ◽  
Three Dimensional ◽  
Dimensional Photonic Crystal

Application of Computational Intelligence to Investigation of Defect Centers in Semi-Insulating Materials by Photoinduced Transient Spectroscopy

2007 ◽  
Vol 994 ◽  
Author(s):  
Pawel Kaminski ◽  
Stanislaw Jankowski ◽  
Roman Kozlowski ◽  
Janusz Bedkowski
Keyword(s):  
Computational Intelligence ◽  
Emission Rate ◽  
Thermal Emission ◽  
Dimensional Space ◽  
Three Dimensional ◽  
Inverse Laplace Transform ◽  
Model Complexity ◽  
Support Vector ◽  
Defect Centers ◽  
Temperature Dependences

AbstractA computational intelligence algorithm has been applied to extracting trap parameters from the photocurrent relaxation waveforms recorded at the temperature range of 20-320 K for semi-insulating (SI) InP samples. Using the inverse Laplace transform procedure, the spectral surfaces, visualized in the three dimensional space as functions of temperature and emission rate, are calculated. The processes of thermal emission of charge carriers from defect centers manifest themselves as the sharp folds on the spectral surface. Using a set of Gaussian functions, the approximating surface is created and the ridgelines of the folds, giving the temperature dependences of the emission rate for the detected traps, are determined. The approximation is performed using the support vector machine (SVM) algorithm which allows for trading off between the model complexity and fitting accuracy. The new approach is exemplified by comparing the defect structure of SI InP wafers after annealing in iron phosphide and pure phosphorous atmospheres.

scholarly journals Protostellar Outflows at the EarliesT Stages (POETS)

2020 ◽  
Vol 635 ◽  
pp. A118
Author(s):  
L. Moscadelli ◽  
A. Sanna ◽  
C. Goddi ◽  
V. Krishnan ◽  
F. Massi ◽  
...  
Keyword(s):  
Thermal Emission ◽  
Three Dimensional ◽  
Radio Continuum ◽  
Young Stellar Objects ◽  
High Mass ◽  
Proper Motions ◽  
Long Baseline ◽  
Protostellar Outflows ◽  
Water Masers ◽  
Water Maser

Context. 22 GHz water masers are the most intense and widespread masers in star-forming regions. They are commonly associated with protostellar winds and jets emerging from low- and high-mass young stellar objects (YSO). Aims. We wish to perform for the first time a statistical study of the location and motion of individual water maser cloudlets, characterized by typical sizes that are within a few au, with respect to the weak radio thermal emission from YSOs. Methods. For this purpose, we have been carrying out the Protostellar Outflows at the EarliesT Stages survey of a sample (38) of high-mass YSOs. The 22 GHz water maser positions and three-dimensional (3D) velocities were determined through multi-epoch Very Long Baseline Array observations with accuracies of a few milliarcsec (mas) and a few km s−1, respectively. The position of the ionized core of the protostellar wind, marking the YSO, was determined through sensitive radio continuum, multi-frequency Jansky Very Large Array observations with a typical error of ≈20 mas. Results. The statistic of the separation of the water masers from the radio continuum shows that 84% of the masers are found within 1000 au from the YSO and 45% of them are within 200 au. Therefore, we can conclude that the 22 GHz water masers are a reliable proxy for locating the position of the YSO. The distribution of maser luminosity is strongly peaked towards low values, indicating that about half of the maser population is still undetected with the current Very Long Baseline Interferometry detection thresholds of 50–100 mJy beam−1. Next-generation, sensitive (at the nJy level) radio interferometers will have the capability to exploit these weak masers for an improved sampling of the velocity and magnetic fields around the YSOs. The average direction of the water maser proper motions provides a statistically-significant estimate for the orientation of the jet emitted by the YSO: 55% of the maser proper motions are directed on the sky within an angle of 30° from the jet axis. Finally, we show that our measurements of 3D maser velocities statistically support models in which water maser emission arises from planar shocks with propagation direction close to the plane of the sky.

Supercapacitive behavior depending on the mesopore size of three-dimensional micro-, meso- and macroporous silicon carbide for supercapacitors

2015 ◽  
Vol 17 (6) ◽  
pp. 4424-4433 ◽  
Author(s):  
Myeongjin Kim ◽  
Ilgeun Oh ◽  
Jooheon Kim
Keyword(s):  
Silicon Carbide ◽  
Porous Structure ◽  
Synthesis Method ◽  
Three Dimensional ◽  
Macroporous Silicon ◽  
Facile Synthesis ◽  
Capacitive Performance ◽  
Structure And Morphology

A facile synthesis method is developed to prepare the three-dimensional micro-, meso- and macroporous silicon carbide spheres that exhibit a unique porous structure and morphology, resulting in high super-capacitive performance.

Partially Oxidized Macroporous Silicon: A Three-Dimensional Photonic Matrix for Microarray Applications

2006 ◽  
Vol 18 (23) ◽  
pp. 3135-3139 ◽  
Author(s):  
M. H. Klühr ◽  
A. Sauermann ◽  
C. A. Elsner ◽  
K. H. Thein ◽  
S. K. Dertinger
Keyword(s):  
Three Dimensional ◽  
Macroporous Silicon

Two- and three-dimensional photonic crystals made of macroporous silicon and liquid crystals

2003 ◽  
Vol 83 (15) ◽  
pp. 3036-3038 ◽  
Author(s):  
Guido Mertens ◽  
Thorsten Röder ◽  
Heinrich Matthias ◽  
Heinrich Marsmann ◽  
Heinz-Siegfried R. Kitzerow ◽  
...  
Keyword(s):  
Liquid Crystals ◽  
Photonic Crystals ◽  
Three Dimensional ◽  
Macroporous Silicon
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