Investigation on Adsorption of Polar Molecules in Vegetable Insulating Oil by Functional Fossil Graphene.

As a new engineering dielectric, vegetable insulating oil is widely used in electrical equipment. Small polar molecules such as alcohol and acid will be produced during the oil-immersed electrical equipment operation, which seriously affects the safety of equipment. The polar molecule can be removed by using functional fossil graphene materials.

An Improved Magnetic Field Method to Locate the Grounding Conductor.

The location of the grounding grid conductors is critical for performing corrosion diagnosis and maintenance work. An improved magnetic field differential method to locate the unknown grounding grid based on truncation errors and the round-off errors analysis is presented in this paper. It was proven that a different order of the magnetic field derivative can be used to determine the position of the grounding conductor according to the peak value of the derivative.

Defect Identification Method for Transformer End Pad Falling Based on Acoustic Stability Feature Analysis.

A transformer's acoustic signal contains rich information. The acoustic signal can be divided into a transient acoustic signal and a steady-state acoustic signal under different operating conditions. In this paper, the vibration mechanism is analyzed, and the acoustic feature is mined based on the transformer end pad falling defect to realize defect identification.

Study on the Reaction Mechanism of Ethylene Propylene Diene Monomer Sealing Material and CFO-CO Gas Mixture.

The eco-friendly insulating medium CFO gas has attracted the attention of many researchers due to its superior environmental protection and insulation properties. However, there are few studies on the compatibility of CFO gas with sealing materials for the gas-insulated equipment (GIE), which will bury hidden dangers for its engineering application. In this study, the compatibility of CFO gas with an ethylene propylene diene monomer (EPDM) sealing material which is most used in equipment was tested, and its reaction mechanism was simulated.

Alkaline thermal treatment of seaweed for high-purity hydrogen production with carbon capture and storage potential.

Current thermochemical methods to generate H include gasification and steam reforming of coal and natural gas, in which anthropogenic CO emission is inevitable. If biomass is used as a source of H, the process can be considered carbon-neutral. Seaweeds are among the less studied types of biomass with great potential because they do not require freshwater.

An Fe-V@NiO heterostructure electrocatalyst towards the oxygen evolution reaction.

The development of a nonprecious and Earth-abundant electrocatalyst with high electrocatalytic activity for the oxygen evolution reaction (OER) is an emerging hot issue and remains a grand challenge. In the present work, we proposed a facile strategy to construct ultrathin NiO nanosheets decorated with Fe-V nanoparticles on nickel foam (Fe-V@NiO/NF) for use as an OER electrocatalyst. Due to the 3D rational configuration, the Fe-V@NiO/NF with a heterostructure shows excellent electrocatalytic activity towards the OER.

Influence of Oxygen on the Thermal Decomposition Properties of CFN-N-O as an Eco-Friendly Gas Insulating Medium.

The CFN (fluorinated nitrile) gas mixture has been recognized as the most potential substitute gas to SF used in gas-insulated equipment. In this paper, we explored the thermal stability and decomposition properties of the CFN-N-O gas mixture. The influence mechanism of oxygen content and temperature on the byproduct generation was obtained and analyzed.

Research on the Frequency-Dependent Halfwave Voltage of a Multifunction Integrated Optical Chip in an Interferometric Fiber Optic Gyroscope.

The multifunction integrated optical chip (MIOC) is one of the most critical parts of the interferometric fiber optic gyroscope (IFOG), and research on the halfwave voltage of the MIOC is meaningful for a high-precision IFOG. In this paper, the correlation between the frequency and halfwave voltage, which affects the interference light intensity of IFOG, is presented theoretically. A widespread measurement method for frequency dependence of the halfwave voltage, based on lock-in amplification and sinusoidal modulation, is proposed.

On rational bounds for the gamma function.

In the article, we prove that the double inequality [Formula: see text] holds for all [Formula: see text], we present the best possible constants and such that [Formula: see text] for all [Formula: see text], and we find the value of [Formula: see text] in the interval [Formula: see text] such that [Formula: see text] for [Formula: see text] and [Formula: see text] for [Formula: see text], where [Formula: see text] is the classical gamma function, [Formula: see text] is Euler-Mascheroni constant and [Formula: see text] .

On approximating the modified Bessel function of the second kind.

In the article, we prove that the double inequalities [Formula: see text] hold for all [Formula: see text] if and only if [Formula: see text] and [Formula: see text] if [Formula: see text], where [Formula: see text] is the modified Bessel function of the second kind. As applications, we provide bounds for [Formula: see text] with [Formula: see text] and present the necessary and sufficient condition such that the function [Formula: see text] is strictly increasing (decreasing) on [Formula: see text].