Article
Engineering, Manufacturing
Alfonso Fernandez, Ralph Felice, Cesar A. Terrazas-Najera, Ryan Wicker
Summary: This research describes a new method for measuring the emissive behaviors of PBF materials using a multi-wavelength or Spectropyrometer. Implemented in an EB PBF machine, it allows for measuring spectral emissive behavior and controlling the visual scanning profile during processing.
ADDITIVE MANUFACTURING
(2021)
Article
Chemistry, Physical
Silvana De Iuliis, Roberto Donde, Igor Altman
Summary: This study challenges the assumption of time independence of the spectral behavior of emissivity of oxide nanoparticles formed in flames, and suggests that it can change with time due to electronic transitions in wide-gap dielectrics. This phenomenon is particularly crucial for interpreting fast processes during laser-induced experiments.
Article
Thermodynamics
Jiazhou Li, Yang Huang, Lin Fu, Tairan Fu, Jiansheng Zhang
Summary: A multi-wavelength measurement method is introduced to determine the radiation properties of semi-transparent materials, avoiding the strong dependence on accurate temperature measurements or emissivity model. Experimental results show that the radiation properties of samples vary at different temperatures, and the upper limit of sample temperature can be extended with the increase of laser power. The research work provides a useful reference for measuring the high-temperature radiation properties of semi-transparent materials.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2022)
Article
Materials Science, Multidisciplinary
Koichi Tanaka, Michael E. Liao, Angel Aleman, Hicham Zaid, Mark S. Goorsky, Suneel Kodambaka
Summary: Highly-oriented B1-TaC(111) and rhombohedral-Ta3C2(0001) phases were successfully formed on Al2O3(0001) substrates during ultrahigh vacuum dc magnetron sputtering, with different film surface structures observed under varying ethylene partial pressures. Ta3C2 phase was found to be more stable than TaC phase on the Al2O3(0001) substrate.
Article
Thermodynamics
Boris P. Aduev, Denis R. Nurmukhametov, Igor Yu Liskov, Alexandr A. Zvekov
Summary: The glow spectral kinetics of aluminum nanoparticles in RDX and PETN composites caused by explosion stimulated by neodymium laser pulse were studied for the first time with nanosecond temporal resolution. Fluorescence related to NO2 appears if the laser pulse energy density is higher than the critical one, leading to an exothermal decomposition reaction and explosion of the sample. The emission spectrum of the explosion products is a thermal one with temperatures estimated using spectral pyrometry approach.
COMBUSTION AND FLAME
(2021)
Article
Chemistry, Multidisciplinary
Chao Li, Deren Kong, Yongjuan Wang, Liming Gao, Xiangyong Zhang, Qi Zhang
Summary: High-temperature measurements are important in scientific research, materials processing, and equipment evaluation due to their direct impact on materials and their properties. This paper presents a temperature measurement method using a color CCD based on matrix search. By transforming the traditional temperature reverse calculation process into a forward matrix search process and incorporating process parameters such as medium absorption gamma correction, the method saves calculation resources and is closer to actual temperature measurement conditions. The method includes a temperature measurement process and a temperature visualization procedure, and flame temperature measurement experiments were conducted to obtain error results. The robustness of the solution method is discussed by comparing the solution results and chrominance deviation distance between the perturbation emissivity model and the non-perturbation emissivity model.
APPLIED SCIENCES-BASEL
(2023)
Article
Materials Science, Ceramics
D. Manara, K. Popa, D. Robba, L. Fongaro, J. -Y. Colle, A. Bulgheroni
Summary: The study focuses on the absorption and heating process of nano-crystalline CeO2 using a 1064.5 nm Nd:YAG laser line in compressed air. It was found that the behavior of CeO2, including transparent/opaque transition and melting, is strongly dependent on crystallite size. Additionally, by optimizing the heating conditions under suitable oxygen overpressure, nano-crystals can be directly melted at a higher temperature than under oxidizing conditions due to their higher stability with respect to oxygen losses.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2021)
Article
Optics
Fatima K. Suleiman, Kaihsiang Lin, Kyle J. Daun
Summary: This paper presents an empirical approach for modeling the spectral emissivity of advanced high strength steel, and found that the response surface methods (RSM) is a viable approach for developing spectral emissivity models for pyrometry applications. The study shows significant main and interaction effects across the spectral range, with different factors dominating at shorter and longer wavelengths. The predicted spectral emissivity values obtained from the model fitted for a three-channel pyrometer show good agreement with the measurements.
JOURNAL OF QUANTITATIVE SPECTROSCOPY & RADIATIVE TRANSFER
(2021)
Article
Biochemistry & Molecular Biology
Elizaveta P. Simonenko, Anatoly F. Kolesnikov, Aleksey V. Chaplygin, Mikhail A. Kotov, Mikhail Yu. Yakimov, Ilya V. Lukomskii, Semen S. Galkin, Andrey N. Shemyakin, Nikolay G. Solovyov, Anton S. Lysenkov, Ilya A. Nagornov, Artem S. Mokrushin, Nikolay P. Simonenko, Nikolay T. Kuznetsov
Summary: The oxidation behavior of HfB2-30 vol.%SiC ceramic material modified with 1 vol.% graphene under the supersonic flow of dissociated CO2 and the combined heating of high-speed CO2 jets and ytterbium laser radiation was studied. The addition of laser radiation led to local heating of the central region without sample cracking or destruction. X-ray phase analysis, Raman spectroscopy, and scanning electron microscopy were used to investigate the oxidized surfaces and cross sections of the ceramics.
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2023)
Article
Physics, Applied
K. Leonova, N. Britun, S. Konstantinidis
Summary: This study compares the discharge effects of hot magnetron sputtering (HMS) and cold magnetron sputtering (CMS), focusing on the current-voltage trends, behaviour of spectral lines, target temperature, and deposition rate. The results show that hot magnetron sputtering has a higher deposition rate at an appropriate power density.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2022)
Article
Instruments & Instrumentation
Kun Yu, Yinxue Bai, Gangquan Wang, Longfei Li, Kaihua Zhang, Yufang Liu
Summary: The near-infrared normal spectral emissivity of molten Fe-Ni alloys was measured and its dependence on wavelength, temperature, and composition was systematically investigated. The results showed that Fe70Ni30 had higher emissivity in the iron-rich area, while Fe30Ni70 had the lowest emissivity in the nickel-rich area. The measured and simulated results demonstrated the reliability of the emissivity of molten Fe-Ni alloys. The emissivity data of Fe-Ni alloys provided reliable information for alloy property research.
INFRARED PHYSICS & TECHNOLOGY
(2023)
Article
Optics
Joseph B. Murray, Matthew J. Murray, Brandon Redding
Summary: We propose a spectrometer design that utilizes Brillouin lasing for compressing broadband spectra. By exploiting the linear dependence between Brillouin frequency shift and optical wavelength, the entire C-band can be compressed into a 230 MHz wide RF spectrum. This design allows continuous monitoring of a 4 THz wide optical spectrum using a standard analog-to-digital converter.
Article
Engineering, Electrical & Electronic
Wenjie Yue, Tao Chen, Wei Kong, Chengbo Mou, Genghua Huang, Zhiping He, Rong Shu
Summary: This study demonstrates a spectral and repetition rate programmable Yb-doped fiber laser using an acousto-optic tunable filter (AOTF) as both the intra-cavity spectral filter and temporal modulator. Different pulsed operation modes, including tunable single-wavelength, simultaneous dual-wavelength, and alternative dual-wavelength lasing, were achieved by driving the AOTF with specially programmed sequences of wave packets. The combination of both spectral and temporal control without moving elements provides a promising approach for the development of a simple yet versatile fiber laser.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2022)
Article
Engineering, Aerospace
A. V. Frunze
Summary: The paper describes an algorithm that uses numerical methods to calculate the relationship between the temperature of the spectral ratio and the actual temperature of a non-gray object. The algorithm takes into account the dependence of the spectral emissivity of the object on both wavelength and temperature. This algorithm can be applied to various types of pyrometers and provides a solution that was not previously available in the literature.
THERMOPHYSICS AND AEROMECHANICS
(2023)
Article
Engineering, Electrical & Electronic
Qun Gao, Yueqing Du, Zhiwen He, Dong Mao, Jianlin Zhao
Summary: This study demonstrates a hybrid-structure fiber laser consisting of SMF and FMF, capable of delivering stable near-chirp-free solitons for various applications. The experimental results validate the superior performance of the laser and highlight its significant research potential.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2021)
Article
Physics, Applied
A. I. Savvatimsky, S. V. Onufriev, G. E. Valyano, A. N. Kireeva, Yu. B. Patrikeev
Article
Physics, Fluids & Plasmas
M. A. Sargsyan, D. V. Tereshonok, G. E. Valyano, V. V. Scherbakov, P. A. Konovalov, M. Kh. Gadzhiev
PHYSICS OF PLASMAS
(2020)
Article
Physics, Applied
V. P. Petrovsky, E. P. Pakhomov, M. A. Sheindlin, T. M. Falyakhov, A. A. Vasin, P. S. Vervikishko
Article
Energy & Fuels
Mikhail S. Vlaskin, George E. Valyano, Andrey Z. Zhuk, Evgeny Shkolnikov
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
(2020)
Article
Materials Science, Multidisciplinary
A. I. Savvatimskiy, S. V. Onufriev, G. E. Valyano, S. A. Muboyadzhyan
JOURNAL OF MATERIALS SCIENCE
(2020)
Article
Thermodynamics
V. V. Lozanov, A. Utkin, A. A. Vasin, M. A. Sheindlin, N. Baklanova
THERMOCHIMICA ACTA
(2020)
Article
Physics, Multidisciplinary
T. I. Borodina, G. E. Val'yano, V. T. Karpukhin, M. M. Malikov, M. A. Kazaryan
BULLETIN OF THE LEBEDEV PHYSICS INSTITUTE
(2020)
Article
Materials Science, Ceramics
Tatiana Bgasheva, Timerkhan Falyakhov, Sergei Petukhov, Michael Sheindlin, Andrey Vasin, Pavel Vervikishko
Summary: This study successfully measured the melting temperature of calcium oxide using laser-pulse heating and advanced temperature measurement techniques, eliminating past ambiguities and determining a melting point of 3160K.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2021)
Article
Engineering, Electrical & Electronic
M. M. Malikov, G. E. Val'yano, T. Borodina
Summary: The experimental study investigates the deposition of silver on the surfaces of micro- and nanoparticles of zirconium, molybdenum, and their oxides obtained through laser ablation of pure metals in aqueous solutions of silver nitrate. The results suggest that silver-coated zirconium and molybdenum oxides can enhance Raman scattering amplitudes and be utilized in diagnostic techniques based on surface-enhanced Raman scattering.
QUANTUM ELECTRONICS
(2021)
Article
Green & Sustainable Science & Technology
Olesya A. Buryakovskaya, Anna Kurbatova, Mikhail S. Vlaskin, George E. Valyano, Anatoly Grigorenko, Grayr N. Ambaryan, Aleksandr O. Dudoladov
Summary: By comparing the reaction characteristics of hydroreactive powders with different additives in a saline solution, it was found that adding different substances has different effects on reaction rate and hydrogen yield. These differences can be explained by variations in particle size, accumulated crystal lattice defects during ball milling, the morphology of the solid reaction product covering the particles, and the effects of the alloy and metal scrap components on the reaction.
Article
Materials Science, Ceramics
A. I. Savvatimskiy, S. V. Onufriev, G. V. Valyano, A. A. Nepapushev, D. O. Moskovskikh
Summary: This study investigated the physical properties of tantalum carbide at high temperatures ranging from 2000 to 5500 K. The experimental results revealed that this composition of carbide melts within a narrow temperature range of 4100-4300 K, and the enthalpy values at the beginning and end of melting were measured. Additionally, the specific heat and electrical resistance of the solid and liquid states of tantalum carbide were determined experimentally. The study also provides new data on the liquid phase properties of tantalum carbide.
CERAMICS INTERNATIONAL
(2022)
Article
Energy & Fuels
A. Z. Zhuk, E. I. Shkolnikov, T. I. Borodina, G. E. Valiano, A. V. Dolzhenko, E. A. Kiseleva, S. A. Kochanova, E. D. Filippov, V. A. Semenova
Summary: The study introduces a new hydrogen generation system, consisting of an aluminum-based hydrogen generating composition and a fully automated generator. The composition was synthesized using mechanochemical activation of aluminum powder with Bi and Sn as additives. The system achieved a high rate of hydrogen evolution and yield through maintaining a temperature of at least 70 degrees C in the reaction zone. Feasibility estimations of the system are presented.
Article
Chemistry, Multidisciplinary
Grayr N. Ambaryan, Olesya A. Buryakovskaya, Vinod Kumar, Georgii E. Valyano, Elena A. Kiseleva, Anatoly V. Grigorenko, Mikhail S. Vlaskin
Summary: This study investigates the hydrothermal oxidation of aluminum, a exothermic process that produces hydrogen and aluminum oxide (or hydroxide). The chemical purity of aluminum was found to significantly affect the oxidation kinetics, with more pure aluminum oxidizing much faster.
APPLIED SCIENCES-BASEL
(2023)
Article
Engineering, Biomedical
Svetlana Skvortsova, Aleksei Orlov, Georgii Valyano, Victor Spektor, Natalia Mamontova
Summary: The study showed that thermohydrogen treatment and vacuum ion-plasma nitriding have significant effects on the volume and surface structure of ball heads made of Ti-6Al-4V alloy, increasing hardness, improving surface quality, and reducing friction wear. Additionally, the formation of oxynitride nanoscale layer on the surface was found to change the color and improve wear resistance in ball heads implanted in the human body for 12 years.
JOURNAL OF FUNCTIONAL BIOMATERIALS
(2021)
Article
Metallurgy & Metallurgical Engineering
D. A. Ivanov, S. D. Shlyapin, G. E. Valyano, L. V. Fedorova
RUSSIAN JOURNAL OF NON-FERROUS METALS
(2019)
