INFLUENCE OF THERMAL STRESS RATE ON CHANGES IN ELECTRICAL INSULATING OILS

This work solves the comparison of two different thermal stress times for selected liquid insulation materials based on transformer oils by impedance spectroscopy. Research is focused on actual and progressive liquid insulation materials. The scientific objectives of the experiment are focused on the determination of hypotheses, defined by predictable electrophysical parameters in experimental conditions, which are described in the analysis of the measured results.

NANOPARTICLES IN ANALYTICAL LASER AND PLASMA SPECTROSCOPY - A REVIEW OF RECENT DEVELOPMENTS IN METHODOLOGY AND APPLICATIONS

The present review attempts to comprehensively overview the progress in the field of nanoparticle-related analytical laser and plasma spectroscopy research, focusing on the results of the past decade. The discussion...

Microscopic Laser Raman and Infrared Spectroscopic Study of Tengchongite

Tengchongite is a uranyl molybdate uranium mineral and it was found and named by Chen 1985.No more scholars studied on tengchongite after Chen’s work, The identification of this mineral has only been confirmed by single crystal X-ray diffraction. In the paper, micro laser Raman spectroscopy and infrared spectroscopy are used to identify the spectroscopy properties of tengchongite. The studies fill in the gaps of more than 30 years in terms of the molecular spectroscopy research of tengchongite. The mineral has an ideal model of Ca(UO2)6(MoO4)2O5•12H2O its bands attributed to the vibrating units are clearly identified in the Raman spectrum. Symmetric stretching modes at 812 cm-1 and 839 cm-1 are assigned to ν1 (UO2)2+ ,The ν3 antisymmetric stretching modes of (UO2)2+ are observed at 896 cm-1, Symmetric stretching modes at 419-1 and 440 cm-1 are assigned to ν2 (UO2)2+ .Symmetric stretching modes at 919cm-1 are assigned to ν1(MoO4)2-,The ν3 antisymmetric stretching modes of (MoO4)2- are observed at 752 cm-1, the in-plane ν2(MoO4)2-and the out-of-plane ν4(MoO4)2- bending modes are at 169 cm-1 and 254 cm-1. IR spectrum of tengchongite shows the major uranyl band at 858 cm-1 and 693 cm-1, Mo-O bonds are observed at about 985 cm-1 and 780 cm-1, and H2O groups are present with a wide range peaks from 3100 cm-1 to 3500 cm-1 and 1647 cm-1, and the band at 1432.4 cm-1 is probably due to the stretching vibration hydroxyl (OH-1), therefore, tengchongite contains may include hydroxyl and its chemical formula needs to be modified .

A Review of Chinese Raman Spectroscopy Research Over the Past Twenty Years

This paper introduces the major Chinese research groups in the fields of biomedicine, food safety, environmental testing, material research, archaeological and cultural relics, gem identification, forensic science, and other research areas of Raman spectroscopy and combined methods spanning the two decades from 1997 to 2017. Briefly summarized are the research directions and contents of the major Chinese Raman spectroscopy research groups, giving researchers engaged in Raman spectroscopy research a more comprehensive understanding of the state of Chinese Raman spectroscopy research and future development trends to further develop Raman spectroscopy and its applications.