Article
Optics
Massimiliano F. Sacchi
Summary: This study examines energetic exchanges and fluctuations in two-stroke quantum thermodynamic engines with multilevel quantum systems as the working fluid, differentiating between three modes of operation, and exploring thermodynamic uncertainty relations between entropy production and signal-to-noise ratio. The research bridges the gap between two-qubit and two-mode bosonic swap engines, highlighting maintained and lost properties as dimension increases.
Article
Physics, Fluids & Plasmas
Massimiliano F. Sacchi
Summary: In this study, we investigate two-mode bosonic engines undergoing an Otto cycle. Energy exchange between the two bosonic systems is facilitated by a tunable unitary bilinear interaction, while cyclic operation is achieved by relaxation to different-temperature baths. Using a two-point measurement approach, we determined the joint probability of stochastic work and heat, and derived exact expressions for work and heat fluctuations, revealing interdependencies among average extracted work, fluctuations, and efficiency. Additionally, thermodynamic uncertainty relations were established between the signal-to-noise ratio of observed work and heat and entropy production.
Article
Automation & Control Systems
Rui Fu, Olga Movilla Miangolarra, Amirhossein Taghvaei, Yongxin Chen, Tryphon T. Georgiou
Summary: The recently developed stochastic control formalism allows for quantifying power output and efficiency of stochastic thermodynamic engines with time-varying temperature, and provides explicit bounds on power and efficiency.
Article
Physics, Multidisciplinary
Harry J. D. Miller, M. Hamed Mohammady, Marti Perarnau-Llobet, Giacomo Guarnieri
Summary: Thermodynamic uncertainty relations reveal the trade-off between precision and entropy production, setting an upper bound for the efficiency of autonomous heat engines. Heat engines operating in the periodic slow-driving regime can satisfy a less restrictive uncertainty relation, allowing for finite power production with small fluctuations while operating close to reversibility. The inclusion of quantum fluctuations reduces engine efficiency relative to average power and reliability.
PHYSICAL REVIEW LETTERS
(2021)
Article
Materials Science, Multidisciplinary
Zeng-Yu Yang, Dan Wei, Alessio Zaccone, Yun-Jiang Wang
Summary: This study introduces a new concept of integrated glassy defect (IGD) based on machine learning and atomistic physics to comprehensively understand the structural features and dynamic properties of amorphous materials. This approach can efficiently predict athermal plasticity and detect vibrational anomalies as well as relaxation and diffusion dynamics in glasses.
Article
Thermodynamics
Taehoon Kim, Junghwan Moon, Joonho Jeon
Summary: Stricter regulations for internal combustion engines have led to the inclusion of eco-friendly fuels, such as bioethanol, to reduce emissions. A study was conducted to quantify the combustion performance and particle emissions of ethanol fuel in gasoline direct injection (GDI) engines. Three different engine combustion modes were examined, and the flame characteristics and particle size distribution were measured. The study found that increasing ethanol fuel content resulted in different combustion and flame development, with lean combustion modes producing more particles. The physical properties of ethanol fuel played a significant role in fuel-air mixture quality and combustion process. This comparative study improves the understanding of in-cylinder combustion processes and their correlations.
Article
Thermodynamics
Alexander Bucknell, Matthew McGilvray, David R. H. Gillespie, Geoffrey Jones, Benjamin Collier
Summary: This paper presents a new ice crystal icing model for simulation of engine icing, allowing mixed phase accretions on warm surfaces. The model is developed by adapting the Extended Messinger Model, enabling analysis of mixed phase conditions of ice crystals and supercooled water.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2021)
Article
Materials Science, Multidisciplinary
Jingyi Zhang, Yan Chen, Shanjun Chen, Jie Hou, Ruijie Song, Zai-Fa Shi
Summary: The electronic structure, mechanical, optical and thermodynamic properties of cubic fluoroperovskite InBeF3 were investigated under high pressure. The optimized crystal structure of InBeF3 is in good agreement with the literature. The band structure analysis revealed that InBeF3 is an indirect band gap semiconductor and the band gap decreases as pressure increases. In addition, the optical properties and thermodynamic properties of InBeF3 crystal were studied. The results suggest that InBeF3 has potential applications in optical and ultraviolet devices.
RESULTS IN PHYSICS
(2023)
Article
Engineering, Mechanical
Ziliang Li, Jianxing Li, Ye Zhu, Jinbao Guo, Meng Li, Yu Luo
Summary: In this study, a three-step prediction method was developed to successfully predict the thermal mechanical fatigue life of an Al-Si alloy piston, and its effectiveness was verified. The mechanism of piston cracking is mainly attributed to plastic deformation and microcracks induced by high tensile stress, leading to macrocracks. The life of the piston varies under different working conditions, especially under thermal shock load and combustion pressure influences.
FATIGUE & FRACTURE OF ENGINEERING MATERIALS & STRUCTURES
(2021)
Article
Polymer Science
Ronaldo Ariati, Flaminio Sales, Andrews Souza, Rui A. Lima, Joao Ribeiro
Summary: PDMS is a promising elastomer with various applications, and its properties can be enhanced by mixing with other materials such as fibers or waxes. Few studies have focused on comparing different PDMS composites, showing a need for further research in this area.
Article
Automation & Control Systems
Yao Lu, Ye Ding, MaoLu Wang, LiJun Yang, Yang Wang
Summary: The study innovatively utilized nanosecond ultraviolet (UV) laser for removing the painting layer from AH36 steel substrate, proposed the feasibility of UV laser cleaning theoretically, examined the cleaned surface quality and enhanced mechanical properties. By varying laser fluences during cleaning, different microstructures were acquired, while the mechanical properties analysis revealed the effectiveness of laser cleaning in increasing surface microhardness, tensile strength, and bending strength.
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2021)
Article
Thermodynamics
Julius Thaddaeus, Godwin O. Unachukwu, Chigbo A. Mgbemene, Apostolos Pesyridis, Muhammad Usman, Fuhaid Aziz Alshammari
Summary: The application of ORC system for WHR in truck engines shows promising results in reducing CO2 emissions and improving fuel efficiency, with successful modeling achieving significant power output and efficiency improvements.
THERMAL SCIENCE AND ENGINEERING PROGRESS
(2021)
Article
Materials Science, Multidisciplinary
Maryam Shojaei, Ali Shokuhfar, Ashkan Zolriasatein
Summary: CuAlS2 chalcopyrite nanocrystalline was successfully synthesized through high energy mechanical milling and homogenization annealing, showing that adjusting the processing conditions can control the grain size and crystal structure. The nanocrystals exhibit excellent optical and electrical properties.
MATERIALS TODAY COMMUNICATIONS
(2021)
Article
Engineering, Geological
Ming Fan, Yanhui Han, Xinyu Tan, Liang Fan, Ellen S. Gilliland, Nino Ripepi, Cheng Chen
Summary: This research investigated the influence of mineral heterogeneity on the mechanical properties of Lower Huron Shale through experiments and numerical simulations. It was found that mineral property distribution and shale hydration effect can affect the strength and deformation behavior of shale rocks. The study suggests that numerical models taking into account heterogeneity can improve the accuracy of mechanical property characterization for shale rocks.
ROCK MECHANICS AND ROCK ENGINEERING
(2021)
Article
Chemistry, Physical
Yue Ba, Yu Wen, Shibin Wu
Summary: This study introduces a new landscape design structure and investigates a laser polishing method suitable for 3D printing. The results show that laser polishing significantly improves surface roughness and enhances tensile and flexural strength.
Article
Engineering, Mechanical
J. Benajes, J. V. Pastor, A. Garcia, J. Monsalve-Serrano
EXPERIMENTAL TECHNIQUES
(2018)
Article
Thermodynamics
Alberto Broatch, Jaime Martin, Antonio Garcia, Diego Blanco-Cavero, Alok Warey, Vicent Domenech
INTERNATIONAL JOURNAL OF ENGINE RESEARCH
(2019)
Article
Thermodynamics
Tiemin Xuan, Jose V. Pastor, Jose M. Garcia-Oliver, Antonio Garcia, Zhixia He, Qian Wang, Miriam Reyes
APPLIED THERMAL ENGINEERING
(2019)
Article
Thermodynamics
Tiemin Xuan, Jose M. Desantes, Jose V. Pastor, Jose M. Garcia-Oliver
COMBUSTION AND FLAME
(2019)
Review
Thermodynamics
Pablo Olmeda, Jaime Martin, Francisco J. Arnau, Sushma Artham
INTERNATIONAL JOURNAL OF ENGINE RESEARCH
(2020)
Article
Energy & Fuels
Jose V. Pastor, Antonio Garcia, Carlos Mico, Felipe Lewiski
Article
Energy & Fuels
F. J. Salvador, J. Gimeno, J. Martin, M. Carreres
Article
Energy & Fuels
Jose Pastor, A. Garcia, C. Mico, Alba A. Garcia-Carrero
Article
Energy & Fuels
Jose V. Pastor, Antonio Garcia, Carlos Mico, Alba A. Garcia-Carrero
Article
Chemistry, Multidisciplinary
Jose V. Pastor, Jose M. Garcia-Oliver, Carlos Mico, Alba A. Garcia-Carrero, Arantzazu Gomez
APPLIED SCIENCES-BASEL
(2020)
Article
Energy & Fuels
Jose R. Serrano, Francisco J. Arnau, Jaime Martin, Angel Aunon
Article
Green & Sustainable Science & Technology
Jose V. Pastor, Jose M. Garcia-Oliver, Antonio Garcia, Carlos Mico
JOURNAL OF CLEANER PRODUCTION
(2020)
Article
Thermodynamics
Jose Pastor, Antonio Garcia, Carlos Mico, Felipe Lewiski, Alberto Vassallo, Francesco Concetto Pesce
Summary: The study focuses on the experimental verification of the impact of new piston designs on combustion processes, showing that a more intense reverse flow is generated when using wave protrusions inside the bowl, and that stepped lip and wave-stepped lip pistons exhibit faster late cycle oxidation and more near-stoichiometric zones.
Article
Energy & Fuels
Lis Corral-Gomez, Octavio Armas, Jose A. Soriano, Jose Pastor, Jose M. Garcia-Oliver, Carlos Mico
Summary: This paper presents an experimental installation for studying combustion and injection processes. It uses a two-stroke direct injection diesel engine with optical windows for observation. A two-color pyrometry technique is applied to measure soot formation, and the influence of detector dynamic range and wavelengths on the measurements are investigated. The study finds that using high dynamic range cameras and appropriate filter combinations improves the reliability of the results.
Article
Chemistry, Multidisciplinary
Jose V. Pastor, Carlos Mico, Felipe Lewiski, Francisco J. J. Tejada, Cinzia Tornatore
Summary: Synthetic fuels such as oxymethylene dimethyl ethers (OMEX) can effectively reduce pollutant emissions and carbon footprint in internal combustion engines. OMEX has attractive properties that make it a great candidate for replacing conventional fuels in compression ignition engines. This study aims to analyze the potential of using OMEX together with an innovative piston geometry to reduce soot formation inside the cylinder.
APPLIED SCIENCES-BASEL
(2023)