In view of the extensive use hexagonal boron nitride (hBN) in 2D material electronics, it becomes important to refine its dielectric characterization terms low-field permittivity and high-field strength conductivity up breakdown voltage. The present study aims at filling this gap using DC RF transport two Au-hBN-Au capacitor series variable thickness 10--100 nm range, made large high-pressure, ...

In the context of NV− diamond laser creation (Savvin and Dormidonov in Nat. Commun. 12:7118, 2021), an urgent task is to determine characteristics diamonds that can affect generation. This work aimed at investigating mechanisms superluminescence under action optical pumping by second harmonic Nd:YAG (λ = 532 nm). It was found when HPHT irradiated nm radiation with intensity above ~ 2.0 MW/cm2, ...

In-situ conversion of carbon dioxide into value-added products is an essential process in terms heavy oil upgrading and utilization the main anthropogenic greenhouse gas. In this paper, we discuss a synthesis sodium-coated magnetite (Fe3O4) particles for in-reservoir hydrogenation CO2. The performance obtained catalyst was tested High Pressure/High Temperature (HPHT) reactor imitating reservoir...

Due to the pipelay vessel motions during installation of a subsea pipeline, as-laid direction pipeline changes along nominally straight section route. In High Pressure Temperature (HPHT) presence rogue lateral Out Straightness (OoS) can adversely influence reliability buckle initiation at engineered buckling sites e.g. sleepers. This implies requirement study ensure unwanted buckles are not for...

We present the results of study structure and composition microcrystalline diamonds obtained by high-pressure high temperature sintering detonation nanodiamond particles. Using optical detected magnetic resonance method, photoluminescence spectroscopy Raman we found significantly differ from initial nanodiamonds can be compared to quality diamonds. Monocrystals method oriented attachment have d...

For the work results correct interpretation, it is important to study initial materials that scientists have deal with. Currently, there are a large number of different diamond substrates. Comparison among themselves allows you determine which material dealing In this work, methods infrared (IR) spectrometry, Raman spectroscopy and spectrophotometry used four types materials: polycrystalline CV...