visible spectrum of lightWhen white light is spread apart by a prism or a diffraction grating, the colours of the visible spectrum appear. The colours vary according to their wavelengths. Violet has the highest frequencies and shortest wavelengths, and red has the lowest frequencies and the longes...
High-resolution radio measurements of air showers—cascades of secondary particles in the atmosphere initiated by cosmic rays—reveal that cosmic rays with energies of 1017–1017.5 electronvolts have a mixed composition, with light elements (protons and
measurements are achieved for the multiple-parameter of optical elements such as ultra-long focal lengths and ultra-large curvature radii. The measurements of large-aperture surface profiles, the mean PV was 46.0 nm. For the ultra-long focal length, the relative standard deviation was 0.019%, ...
Thus, LEDs are virtually able to emit any wavelength allowing for the fine-tuning of light spectrum. Light-emitting diodes are generally thought of as the most electrically efficient light source. However, the efficiency of LEDs is dependent on the wavelength of light being produced. Wavelengths ...
We investigate a spectrum splitting approach where light is trapped in a textured dielectric slab and coupled into underlying solar cells of different bandgaps through filters. We describe a specific design featuring an SiO2 textured slab coated with angle restricting incoupling elements and four underl...
摘要: Light emitting diodes, LED are used in various combinations and colors within areas such as museums and shops, etc. Through multiple combinations and the use of reflectors the lighting strength is increased. The LED elements are also used with application specific optical elements....
X-ray Raman spectra of the carbon K-edge have been recorded using 6.461 keV radiation for a petroleum asphaltene. By comparison with coronene, graphite, and paraffin standards, the asphaltene spectrum is seen to be composed of contributions from saturated and aromatic carbon species. The information...
This resonance is due to resonant excitation of the dipole surface plasmon. With the Drude model of dielectric function, thepfreffiffiquency of the dipole surface plasmon can be expressed as vsp&vp 3, if the frequency of electron collisions c is small. The spectrum for the scattering cross-...
In addition, some of the lines seen before and after the flare are not present during the flare. On day 727 only the count rate from the zeroth order could be derived, and the source was too faint for the extraction of a light curve or spectrum. 展开 ...
spectrum images by machine learning algorithms can provide an efficient, economical chemical analysis method to identify light elements at the nanoscale. Results and discussion Full size image Full size image Figure 3 High-angle annular dark-field imaging (HAADF)-scanning transmission electron microscopy...