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lncRNA SNHG14 promotes the actual spreading, migration, and breach of hypothyroid tumour tissues simply by controlling miR-93-5p.
We propose and demonstrate a modulatable all-silicon terahertz absorber based on a cylindrical metamaterial structure. Broadband absorption is obtained from 0.86 to 2.00 THz, with an average absorbance of 94%, indicating a wide absorption bandwidth of 1.14 THz. The maximum absorption, around 1.24 THz, is up to 98%. We employ simulation results to investigate the physical properties of the absorption, and we attribute the broadband absorption to a combination of electric dipole and magnetic dipole modes. Furthermore, the tunable response of the all-silicon terahertz absorber under the optical pump beam, with different fluences, is studied using a hierarchical model for simulating the carrier density of the gradient distribution. Moreover, different polarizations and oblique incidences of terahertz waves are used to verify the polarization and angle-of-incidence insensitivity of the device. The absorber provides a simple method to design a modulated broadband terahertz absorber, and the design scheme is scalable to develop various tunable broadband absorbers at other frequencies. This work holds great potential in modulator applications, imaging devices, and energy conversion.A prototype of an imaging Fourier spectrometer, with corner-cube reflectors in the Michelson interferometer, is developed for visible and near-infrared domains. The use of corner-cube reflectors enables stability of operation, while imaging capability makes wide field of view and, consequently, increases input optical signal. In the imaging mode of operation, the optical signal is recorded by a high-speed camera, enabling spectral measurements in each pixel of the image.Stimulated Raman scattering and laser filamentation produced using nanosecond pulsed complex vector vortex beams (CVVB) are investigated in a 20 cm long methanol cell. The CVVB is generated using q-plates and is tested at orbital angular momentum (L) values of 1, 2, 3, and 4 and circular, radial, and azimuthal polarizations. The results illustrate that the stability and intensity of the generated stimulated Raman has dependence on input polarization and L value. During filamentation, the beam is also shown to break up into multiple primary filaments and that there is a reduction in small-scale filamentation when using CVVBs.The measurement of DC electric fields faces problems such as space charge accumulation and difficulties in distinguishing the DC signal from the output signal. Therefore, a novel, to the best of our knowledge, optical electric field sensor based on the Pockels effect is proposed to measure DC electric fields using a rotating bismuth germanate crystal. Theoretical derivation and signal optimization are performed to eliminate the influence of space charge accumulation on the DC electric field measurement. The measurement results show that the proposed optical electric-field sensor is suitable for the accurate measurement of DC electric fields, and the precision error is within ±0.1%.Brewster's dark patch is a simple optical effect in the environment. It is easily seen, but apparently it has not been formally noticed or explained until quite recently. Nevertheless, some artists appear to have represented it in paintings without, of course, knowing its optical origins. A case can be made that a watercolor by Albrecht Dürer from around 1497 illustrates the phenomenon.Circularly polarized light (CPL) reflections are rare in nature. Only a few animal groups-most notably certain stomatopod crustaceans and certain beetles in the family Scarabaeidae-are known to reflect CPL from incident unpolarized light. Here, we examine five species of metallic scarabs in the genus Chrysina that, to the naked human eye, look remarkably similar. Using a spectropolarimetric reflectometer to characterize the complete Mueller matrix elements of the beetles' elytral surfaces, we found that four of the five species were strongly left-handed circularly polarized (LHCP), and only one scarab species, Chrysina resplendens, had an overall lower degree of polarization and switched from LHCP to right-handed circularly polarized reflectance depending on wavelength.During solar eclipses the sunlit tops of cloud layers and arctic sea ice near the umbra appear salmon-brown when viewed from airplanes or satellites. Under these conditions, the clouds and atmosphere are illuminated by light restricted to the solar limb, which has effective radiating temperatures as low as 4000 K. The resulting limb reddening largely accounts for the color. A second-order scattering model is used to simulate the color of photographs of cloud tops taken from a flight during the 21 August 2017 eclipse and MODIS Aqua and Terra satellite "true color" images during the 2 July 2019 eclipse. These observed color changes provide data that has potential value in determining the vertical temperature profile of the solar photosphere.We report the results of polarimetric observations of the total solar eclipse of 21 August 2017 from Rexburg, Idaho (USA). We use three synchronized DSLR cameras with polarization filters oriented at 0°, 60°, and 120° to provide high-dynamic-range RGB polarization images of the corona and surrounding sky. We measure tangential coronal polarization and vertical sky polarization, both as expected. These observations provide detailed detections of polarization neutral points above and below the eclipsed Sun where the coronal polarization is canceled by the sky polarization. We name these special polarization neutral points after Minnaert and Van de Hulst.Few colorimetric analyses of natural rainbows (i.e., bows seen in rain showers) have been published, and these are limited either to approximate techniques (colorimetrically calibrated red-green-blue (RGB) cameras) or to rainbow proxies (bows seen in sunlit water-drop sprays). Furthermore, no research papers provide angularly detailed spectra of natural rainbows in the visible and near-IR. Thus some uncertainty exists about whether the published spectra and colors differ perceptibly from those in natural rainbows. RO4987655 solubility dmso However, battery-powered imaging spectrometers now make possible direct field measurements of the observed chromaticities and spectra in such bows. These data (1) show consistent spectral and colorimetric patterns along rainbow radii and (2) let one subtract additively mixed background light to reveal the intrinsic colors and spectra produced by rainbow scattering in nature.
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