Article
Chemistry, Inorganic & Nuclear
Ramin Dehghan, Seyyed Ali Seyyed Ebrahimi, Zahra Lalegani, Bejan Hamawandi
Summary: The microstructure and magnetic properties of methane heat-treated Sr-hexaferrite powders during the re-calcination process were investigated. The magnetic behavior of the produced powder in each re-calcination stage was analyzed, and the optimal temperature for re-calcination after methane gas heat treatment was found to be 1000 degrees C.
Article
Chemistry, Multidisciplinary
Ramin Dehghan, Seyyed Ali Seyyed Ebrahimi, Zahra Lalegani, Bejan Hamawandi
Summary: This paper investigates the phase transformation in a gaseous heat treatment and re-calcination process using methane for preparing nanocrystalline Sr-hexaferrite powder. The transformation path during the process is clarified by a phase transformation map, which shows the different intermediate phases and their effects on the phase composition and physical properties of the powder.
Article
Chemistry, Physical
Nicoleta Enea, Valentin Ion, Cristian Viespe, Izabela Constantinoiu, Octavian Buiu, Cosmin Romanitan, Nicu Doinel Scarisoreanu
Summary: In this study, the specific interaction between a modified surface and various gases in gas sensor applications was investigated. The sensitivity of the sensor was enhanced by depositing a conductive polymer on the surface of a piezoelectric ceramic material. The frequency responses of the sensors to different gases were measured to observe differences in their performance based on deposition conditions.
Article
Engineering, Chemical
M. Hossein Sehhat, David Perez-Palomino, Connor Wiedemeier, Tristan Cullom, Joseph W. Newkirk, Ming C. Leu
Summary: The study investigated the morphological changes, the powder property restoration ability, and oxygen reduction effect of copper powder after plasma spheroidization, and explored the impact of re-spheroidization on powder properties. The results showed that the spheroidized powder had higher sphericity, more uniform particle size distribution, and lower oxygen content. Therefore, plasma spheroidization can be used as an alternative oxygen reduction technique.
ADVANCED POWDER TECHNOLOGY
(2023)
Article
Chemistry, Physical
Jheng-Yun Lai, Cheng-Che Hsu, Jian-Zhang Chen
Summary: In this study, rGO-Mn(NO3)2·4H2O was converted into rGO-MnOx using nitrogen atmospheric-pressure plasma jet (APPJ) and/or tube furnace. The SCs processed by APPJ showed better performance compared to furnace-processed ones. Additionally, the rGO-MnOx SC outperformed the previously reported rGO-SnOx SC.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Thermodynamics
Xiang Gou, Han Zhang, Guangyao Li, Yuhao Cao, Qiyan Zhang
Summary: A novel three-stage waste heat recovery solution is proposed for a gas turbine, with dynamic responses studied under different loads and environment changes. The steam flow rate shows fluctuations as the gas turbine load decreases, and the system stability is affected by the varying rate of load. Environmental temperature changes linearly influence the system response, but with differences in response speed and trend due to phase transition processes in different heat exchangers.
APPLIED THERMAL ENGINEERING
(2021)
Article
Chemistry, Physical
Mikhail Yagofarov, Andrey A. Sokolov, Boris N. Solomonov
Summary: This study investigates the relationship between the isochoric heat capacities of liquid and ideal gas phase organic non-electrolytes and their vaporization enthalpy at 298.15 K. The findings suggest that the difference of isobaric and isochoric heat capacities of liquid aromatic compounds is constant within a certain range and does not depend on the vaporization enthalpy. There is a direct proportionality between isochoric heat capacity change and the vaporization enthalpy for 84 compounds, indicating a strong correlation between the two.
JOURNAL OF MOLECULAR LIQUIDS
(2021)
Article
Chemistry, Physical
Y. T. Shi, W. Y. Lu, W. H. Sun, S. D. Zhang, B. J. Yang, J. Q. Wang
Summary: The pressure-dependent microstructure evolution of gas-atomized Fe-based amorphous alloy powders was investigated experimentally and theoretically. The results showed that the amorphous fraction and nucleation mode of particles were sensitive to the gas pressure. Additionally, the amorphous phase underwent three stages of reactions during devitrification.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Thermodynamics
Wenkai Shen, Chang Xing, Haiqing Liu, Li Liu, Qiming Hu, Guohua Wu, Yujia Yang, Shaohua Wu, Penghua Qiu
Summary: This research combines EGR with an adjustable fuel feeding combustor to assess the part-load performance of a 300 kW MGT and the flame spatio-temporal characteristics. The results show that EGR can effectively reduce emissions and improve fuel flexibility.
Article
Thermodynamics
Qiqi Liu, Lulu Sun, Zhenyi Liu, Gang Wang, Jiayu Ma
Summary: Spontaneous combustion in coal mines poses a serious threat to safety. By studying the re-ignition process of coal, the risk of spontaneous combustion can be reduced. The experiments show that CO production, C2H4 concentration, and Graham's fire coefficient can be used as indicator gases to predict the process of spontaneous combustion.
Article
Mathematics
Leonid Plotnikov
Summary: The study aimed to obtain experimental data on local heat transfer of pulsating flows in the intake and outlet pipelines of a piston engine model and to analyze and mathematically describe them. The scientific novelty of the study lies in the first-time acquisition of the patterns of change in the local heat transfer coefficients of pulsating gas flows in the inlet and outlet pipelines for the piston engine model and the proposed mathematical description of the experimental data on local and average heat transfer. The results obtained have important applications in evaluating the quality of cylinder filling and cleaning, determining thermal stresses in gas exchange system components, developing exhaust gas energy utilization devices, creating engine control systems, etc.
Article
Thermodynamics
Ke Zhao, Wei Lin, Xueying Li, Jing Ren
Summary: The study evaluates turbulent flow heat transfer and pressure loss in a channel with different rib heights using numerical simulation and experimental research. Results show that heat transfer enhancement and reduced pressure loss can be achieved with changes in rib height, leading to better overall thermal performance.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2021)
Review
Chemistry, Physical
Vitaliy V. Sanin, Yury Yu Kaplansky, Maksym Aheiev, Evgeny A. Levashov, Mikhail Petrzhik, Marina Ya Bychkova, Andrey Samokhin, Andrey A. Fadeev, Vladimir N. Sanin
Summary: The production and properties of NiAl-Cr-Co-X alloys were studied. Co-doping with Mo and Re significantly improved overall properties, enhancing strength characteristics by forming a ductile matrix. Mo increased strength, while Re modified the structure and further improved properties.
Article
Chemistry, Analytical
Samuel Avila, H. Dennis Tolley, Brian D. Iverson, Aaron R. Hawkins, Shawn L. Johnson, Milton L. Lee
Summary: This study demonstrates that optimized dynamic thermal gradient conditions can improve resolution by up to 13% compared to traditional temperature-programmed conditions, while also slightly shortening retention times.
ANALYTICAL CHEMISTRY
(2021)
Article
Energy & Fuels
Jian Liang, Hao Zhou, Jun Li, Weizhi Kong, Zhanhua Ma, Lanyi Sun
Summary: The study focuses on control structures for isopropyl acetate synthesis in heat integrated reactive distillation, improving dynamic performance with enhanced control schemes. The control structure with temperature difference controller demonstrates the best performance, enhancing tuning stability and adjusting temperature difference for heat exchange process.
CHEMICAL ENGINEERING AND PROCESSING-PROCESS INTENSIFICATION
(2021)
Article
Chemistry, Multidisciplinary
Constantin Virlan, Florin Tudorache, Aurel Pui
ARABIAN JOURNAL OF CHEMISTRY
(2020)
Article
Engineering, Electrical & Electronic
V Manikandan, Iulian Petrila, S. Vigneselvan, Ali Mirzaei, R. S. Mane, Sang Sub Kim, J. Chandrasekaran
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2020)
Article
Engineering, Electrical & Electronic
V Manikandan, Iulian Petrila, S. Kavita, R. S. Mane, Juliano C. Denardin, Stefan Lundgaard, Saulius Juodkazis, S. Vigneselvan, J. Chandrasekaran
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2020)
Article
Engineering, Electrical & Electronic
Tarek Sekrafi, Brahim Bouricha, Zouhour Denden, Sorin Tascu, Ahmed Labidi, Habib Nasri, Cherif Dridi
Summary: The study revealed that the methanol sensor based on ZnTTP thin film exhibits good selectivity and stability, with high detection sensitivity and fast response and recovery times for methanol vapor. The developed sensor also shows excellent reproducibility and low detection limit, making it a promising candidate for methanol detection applications.
IEEE SENSORS JOURNAL
(2021)
Article
Optics
Xin Hua, Tommaso Lunghi, Florent Doutre, Panagiotis Vergyris, Gregory Sauder, Pierrick Charlier, Laurent Labonte, Virginia D'Auria, Anthony Martin, Sorin Tascu, Marc P. De Micheli, Sebastien Tanzilli, Olivier Alibart
Summary: Progress in integrated photonics allows the combination of multiple elementary functions on single substrates to achieve advanced functionalized chips. The study demonstrates a monolithic integrated quantum photonics realization on lithium niobate, showcasing the generation of configurable two-photon states with high visibility.
Article
Optics
David Barral, Virginia D'Auria, Florent Doutre, Tommaso Lunghi, Sebastien Tanzilli, Alicia Petronela Rambu, Sorin Tascu, Juan Ariel Levenson, Nadia Belabas, Kamel Bencheikh
Summary: By selecting the pumping mode and setting the phase, supermode-based second harmonic generation is demonstrated in an integrated nonlinear interferometer. The methods of post-selecting or actively setting the pumping mode pave the way for classical and quantum applications of coupled nonlinear photonic circuits. This approach allows for multimode excitation, encoding, and detection, enabling multiplexing and scaling up light-processing in various applications.
Article
Chemistry, Physical
Iulian Petrila, Florin Tudorache
Summary: This paper investigates the impact of adding Li+ and K+ metal ions on the magnetic and dielectric properties of Mg-Zn ferrite. By controlling the addition of metal ions and selecting sintering temperatures, the performance of ferrite can be optimized. The results show that changes in microstructure directly affect the material's properties.
Article
Materials Science, Textiles
Iuliana G. Lupu, Marian C. Grosu, Oana Cramariuc, Florin Tudorache, Daniela C. Nastac, Horatiu Hogas
Summary: This study presents a cost-effective procedure for obtaining magnetic single cotton yarns using commercially available magnetic powders and adhesives. The diameter of the coated yarns is directly related to the amount of magnetic powder in the coating solution, and increasing the mass percentage of the magnetic powder content improves the magnetic properties of the composite yarns. The highest magnetic properties were measured when neodymium permanent magnets were used for magnetization, with an increase in residual magnetization and saturation with the amount of barium hexaferrite embedded in the textile yarn.
JOURNAL OF THE TEXTILE INSTITUTE
(2022)
Article
Engineering, Electrical & Electronic
Iulian Petrila, Florin Tudorache
Summary: This paper investigated the effect of sintering temperature on copper-zinc spinel ferrite synthesized using a sol-gel self-combustion method, with a focus on its potential application in humidity sensors. The study found that annealing temperatures had a significant impact on the structure, electrical, and magnetic properties of the ferrite material. The analysis also explored the temperature-dependent electrical conductivity, relative magnetic permeability, and relative permittivity, as well as the material's performance as a humidity sensor at various humidity levels.
SENSORS AND ACTUATORS A-PHYSICAL
(2021)
Article
Chemistry, Physical
Alicia Petronela Rambu, Vasile Tiron, Eugen Oniciuc, Sorin Tascu
Summary: In this study, the ferroelectric dipoles switching induced by the fabrication process of alpha-phase waveguides on Z-cut congruent lithium niobate substrates was investigated using piezoresponse force microscopy. The results showed that the proton exchange process caused a spontaneous polarization reversal and a reduction in the piezoelectric coefficient d(33). The study also quantitatively assessed the impact of proton exchange on the piezoelectric coefficient d(33) for different fabrication parameters, showing a correlation between index contrast and d(33) reduction.
Article
Engineering, Electrical & Electronic
N. Ramprasad, Florin Tudorache, G. V. Jagadeesha Gowda, A. El-Denglawey, K. S. Kantharaj, K. V. Arjuna Gowda, K. Manjunatha, V. Jagadeesha Angadi
Summary: This paper presents the structural, Fourier infrared spectroscopic, and dielectric analysis of cobalt chromate (Co2+Cr23+O4) with gadolinium (Gd3+) rare-earth metal additions under different humidity conditions. The results indicate that Gd3+ doped Co2+Cr23+O4 can be used as an active material for humidity sensor applications.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2022)
Article
Multidisciplinary Sciences
Loredana Brinza, Andreea Elena Maftei, Sorin Tascu, Florin Brinza, Mariana Neamtu
Summary: Two environmentally friendly organics, EDTA and EDDS, were used to modify calcium carbonate nanoparticles, showing good removal efficiency and performance in adsorption and photodegradation processes. The results have important implications for wastewater treatment processes and decision-making.
SCIENTIFIC REPORTS
(2022)
Article
Materials Science, Multidisciplinary
N. Ramprasad, G. V. J. Gowda, K. V. A. Gowda, K. S. Kantharaj, F. Tudorache, K. Abdulvakhidov, N. Lyanguzov, I. S. Yahia, H. Y. Zahran, H. Algarni, V. J. Angadi
Summary: In this study, the structural, Fourier infrared spectroscopic, and dielectric properties of 2 mol% gadolinium doped cobalt chromate under humidity and non-humidity conditions were investigated. The doped samples showed potential as active materials for humidity sensors.
INTERNATIONAL JOURNAL OF SELF-PROPAGATING HIGH-TEMPERATURE SYNTHESIS
(2022)
Proceedings Paper
Engineering, Electrical & Electronic
Xin Hua, Tommaso Lunghi, Florent Doutre, Panagiotis Vergyris, Gregory Sauder, Pierrick Charlier, Laurent Labonte, Virginia D'Auria, Anthony Martin, Sorin Tascu, Marc P. De Micheli, Sebastien Tanzilli, Olivier Alibart
Summary: This study reports a monolithic integrated quantum photonic realization on lithium niobate, which can produce various path-coded heralded two-photon states, with 94% raw visibility for Hong-Ou-Mandel interference.
2021 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO)
(2021)
Proceedings Paper
Engineering, Electrical & Electronic
David Barral, Virginia D'Auria, Florent Doutre, Tommaso Lunghi, Sebastien Tanzilli, Alicia Petronela Rambu, Sorin Tascu, Juan Ariel Levenson, Nadia Belabas, Kamel Bencheikh
2021 CONFERENCE ON LASERS AND ELECTRO-OPTICS EUROPE & EUROPEAN QUANTUM ELECTRONICS CONFERENCE (CLEO/EUROPE-EQEC)
(2021)
