Results 1 to 10 of about 70,524 (259)

Spectroscopic Characteristics and Coloring Mechanisms of Different Colored Spinels from Myanmar

open access: yesCrystals, 2023
Spinel is a common gemstone that has attracted the attention of gemologists worldwide because of its high refractive index, rich colors and brilliant hues. Myanmar is an important source of spinel. The present paper provides a systematic characterization
Lei Zhang, Kui He, Qingfeng Guo
doaj   +3 more sources

Terahertz Time-Domain Spectroscopic Characteristics of Typical Metallic Minerals [PDF]

open access: yesMolecules
Accurate identification and understanding of various metallic minerals are crucial for deciphering geological formations, structures, and ages. Giving their pivotal role as essential natural resources, a microscopic exploration of metallic minerals ...
Jingjing Zhang   +10 more
doaj   +2 more sources

Growth, structure, thermal properties and spectroscopic characteristics of Nd3+-doped KGdP4O12 crystal. [PDF]

open access: yesPLoS ONE, 2014
A single crystal of Nd3+-doped KGdP4O12 was successfully grown with the top-seeded solution growth and slow cooling (TSSG-SC) technique. It crystallizes in space group C2/c with cell parameters a = 7.812(2) Å, b = 12.307(3) Å, c = 10.474(2) Å, β = 110.84(
Tongqing Sun   +6 more
doaj   +2 more sources

The Influence of Green Manure Planting on the Spectroscopic Characteristics of Dissolved Organic Matter in Freshwater-Leached Saline–Alkali Soil at Different Depths

open access: yesAgronomy
This study investigated the influence of green manure planting on the spectroscopic properties of dissolved organic matter (DOM) in saline–alkali soil under freshwater leaching conditions at different soil depths.
Yuhao Wang   +4 more
doaj   +3 more sources

Raman signatures of Cnm-positive Streptococcus mutans: II, screening the virulence of clinical isolates [PDF]

open access: yesFrontiers in Microbiology
This study dealt with developing a Raman spectroscopic method for estimating the degree of virulence of Streptococcus mutans bacteria isolated from clinical swab samples.
Giuseppe Pezzotti   +25 more
doaj   +2 more sources

Study on Gemological Characteristics and Inclusions of Yellow Topaz

open access: yesCrystals, 2022
Topaz is a kind of mineral with variable composition and a common gemstone variety. Because of its wide distribution and rich colors, it has attracted the attention of scholars around the world.
Zixiong Song, Qingfeng Guo, Libing Liao
doaj   +1 more source

Study of the Optical Features of Tb3+:CaYAlO4 and Tb3+/Pr3+:CaYAlO4 Crystals for Visible Laser Applications

open access: yesCrystals, 2022
Single crystals of Tb3+ single-doped and Tb3+/Pr3+ co-doped CaYAlO4 were produced by the Czochralski method. The room-temperature polarized absorption spectra, emission spectra, and decay curves were recorded and analyzed in detail.
Yeqing Wang   +7 more
doaj   +1 more source

Temperature-Dependent Optical Properties of Graphene on Si and SiO2/Si Substrates

open access: yesCrystals, 2021
Systematic investigations are performed to understand the temperature-dependent optical properties of graphene on Si and SiO2/Si substrates by using a variable angle spectroscopic ellipsometry. The optical constants of graphene have revealed changes with
Sisi Wu   +5 more
doaj   +1 more source

Optoelectronic investigation and spectroscopic characteristics of polyamide-66 polymer

open access: yese-Polymers, 2022
A semi-crystalline designated nylon 66 polymer is a crucial, high-performance engineering material that is used in wide variety of industrial applications including sensors, electrical insulators, electronic devices, and automotive sector.
Al-Shawabkeh Ali F.
doaj   +1 more source

Polyvinylpyrrolidone and polystyrene composites based on economical high quality biofillers derived from rice husk: Spectroscopic and hydrophilic investigations [PDF]

open access: yesPolyolefins Journal, 2023
Polyvinylpyrrolidone (PVP) composites based on rice husk (RH), rice husk carbon (RHC, i.e., black rice husk ash (BRHA)) and rice husk ash (RHA, i.e., white rice husk ash (WRHA)) were prepared separately through solution casting method. Similar composites
Hamed NazarpourFard
doaj   +1 more source

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