scholarly journals Study on the Microstructure and Spectra of Regrown Quartz Crystals from Chinese Jewelry Market

Crystals ◽  
2021 ◽  
Vol 11 (9) ◽  
pp. 1145
Author(s):  
Danyi Zhou ◽  
Taijin Lu ◽  
Huiru Dai ◽  
Jieran Lv ◽  
Shouming Chen ◽  
...  
Keyword(s):  
Spectral Characteristics ◽  
Three Dimensional ◽  
Natural Quartz ◽  
Quartz Crystals ◽  
Synthetic Process ◽  
Oh Groups ◽  
Growth Environment ◽  
Tomography System ◽  
Lower Porosity ◽  
Stable Growth

Regrown quartz crystals consist of the natural section and the synthetic section grown by hydrothermal technique, which has become popular on the Chinese jewelry market in recent years. Similar gemological properties to those of natural quartz have brought challenges to gem identification and also new questions to scientific research. In this study, microstructure and spectral characteristics of the two sections of regrown quartz crystals were investigated by three dimensional computed tomography system and infrared spectroscopy. Results showed that the natural section has a higher porosity and there are also many micron- to millimeter-sized pores on the interface of the two sections. Different infrared absorption peaks of the two sections at the 3300–3600 cm−1 range were mainly attributed to the different existence state of OH groups. The distinction of microstructure and spectral characteristics between the natural and synthetic sections indicate their different growth condition. Compared with natural quartz, a relatively stable growth environment during the synthetic process leads to a lower porosity and the alkali growth solution could result in the change of the existence state of OH groups in the regrown quartz crystals.

scholarly journals The first observation of 4D tomography measurement of plasma structures and fluctuations

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Chanho Moon ◽  
Kotaro Yamasaki ◽  
Yoshihiko Nagashima ◽  
Shigeru Inagaki ◽  
Takeshi Ido ◽  
...  
Keyword(s):  
Steady State ◽  
Three Dimensional ◽  
Axial Direction ◽  
Axial Position ◽  
Entire Cross Section ◽  
Helicon Plasma ◽  
Emission Profile ◽  
Dimensional Measurement ◽  
Tomography System ◽  
Three Dimensional Measurement

AbstractA tomography system is installed as one of the diagnostics of new age to examine the three-dimensional characteristics of structure and dynamics including fluctuations of a linear magnetized helicon plasma. The system is composed of three sets of tomography components located at different axial positions. Each tomography component can measure the two-dimensional emission profile over the entire cross-section of plasma at different axial positions in a sufficient temporal scale to detect the fluctuations. The four-dimensional measurement including time and space successfully obtains the following three results that have never been found without three-dimensional measurement: (1) in the production phase, the plasma front propagates from the antenna toward the end plate with an ion acoustic velocity. (2) In the steady state, the plasma emission profile is inhomogeneous, and decreases along the axial direction in the presence of the azimuthal asymmetry. Furthermore, (3) in the steady state, the fluctuations should originate from a particular axial position located downward from the helicon antenna.

scholarly journals Non-contact scanning diffuse correlation tomography system for three-dimensional blood flow imaging in a murine bone graft model

2015 ◽  
Vol 6 (7) ◽  
pp. 2695 ◽  
Author(s):  
Songfeng Han ◽  
Johannes Johansson ◽  
Miguel Mireles ◽  
Ashley R. Proctor ◽  
Michael D. Hoffman ◽  
...  
Keyword(s):  
Blood Flow ◽  
Bone Graft ◽  
Three Dimensional ◽  
Flow Imaging ◽  
Blood Flow Imaging ◽  
Tomography System

Sector zoning of trace elements and oxygen isotopes in natural quartz crystals

2006 ◽  
Vol 70 (18) ◽  
pp. A298 ◽  
Author(s):  
A.-L. Jourdan ◽  
T.W. Vennemann ◽  
J. Mullis ◽  
K. Ramseyer
Keyword(s):  
Trace Elements ◽  
Oxygen Isotopes ◽  
Natural Quartz ◽  
Quartz Crystals ◽  
Sector Zoning

High-Speed Three-Dimensional Swept Source Optical Coherence Tomography System Based on LabVIEW

2014 ◽  
Vol 41 (7) ◽  
pp. 0704001 ◽  
Author(s):  
王玲 Wang Ling ◽  
朱海龙 Zhu Hailong ◽  
涂沛 Tu Pei ◽  
吴开华 Wu Kaihua
Keyword(s):  
Optical Coherence Tomography ◽  
High Speed ◽  
Three Dimensional ◽  
Optical Coherence ◽  
Swept Source ◽  
Optical Coherence Tomography System ◽  
Tomography System

scholarly journals FIB-SEM Three-Dimensional Tomography for Characterization of Carbon-Based Materials

2019 ◽  
Vol 2019 ◽  
pp. 1-8 ◽  
Author(s):  
Nan Nan ◽  
Jingxin Wang
Keyword(s):  
Focused Ion Beam ◽  
Ion Beam ◽  
Three Dimensional ◽  
3D Tomography ◽  
Tomography System ◽  
Internal Structures ◽  
Potential Applications ◽  
Scanning Electron ◽  
Carbon Based

A review on the recent advances of the three-dimensional (3D) characterization of carbon-based materials was conducted by focused ion beam-scanning electron microscope (FIB-SEM) tomography. Current studies and further potential applications of the FIB-SEM 3D tomography technique for carbon-based materials were discussed. The goal of this paper is to highlight the advances of FIB-SEM 3D reconstruction to reveal the high and accurate resolution of internal structures of carbon-based materials and provide suggestions for the adoption and improvement of the FIB-SEM tomography system for a broad carbon-based research to achieve the best examination performances and enhance the development of innovative carbon-based materials.

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