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Journal articles on the topic 'Coefficient d'asymétrie du cycle de charge'

Author: Grafiati

Published: 3 February 2024

Last updated: 31 July 2025

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1

Madani, Seyed Saeed, Erik Schaltz, and Søren Knudsen Kær. "An Experimental Analysis of Entropic Coefficient of a Lithium Titanate Oxide Battery." Energies 12, no. 14 (2019): 2685. http://dx.doi.org/10.3390/en12142685.

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In order to understand the thermal behaviour of a lithium-ion battery, the heat generation within the cell should be determined. The entropic heat coefficient is necessary to determine for the heat generation calculation. The entropic heat coefficient is one of the most important factors, which affects the magnitude of the reversible heat. The purpose of this research is to analyze and investigate the effect of different parameters on the entropic coefficient of lithium titanate oxide batteries. In this research, a lithium ion pouch cell was examined in both charging and discharging situations

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2

Ning, Jing Hong, and Sheng Chun Liu. "Performance Experiment of Natural Refrigerant Cascaded Refrigeration System." Advanced Materials Research 383-390 (November 2011): 846–51. http://dx.doi.org/10.4028/www.scientific.net/amr.383-390.846.

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In this paper, the performances of natural refrigerant R290/CO2 cascaded refrigeration system using R290 as high temperature cycle refrigerant and CO2 as low temperature cycle refrigerant were investigated experimentally. The test results show that both CO2 compressor and R290 compressor start up stably and present good running performance. The start-up power and start-up electric current of CO2 compressor are higher than that of R290 compressor. The COP (Coefficient of performance) of R290/CO2 cascaded system enhances with the increase of cooling water mass flow rate and the decrease of cooli

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3

Verbovytskyy, Yu V. "Electrochemical charge-discharge characteristics of RMgNi3.5Mn0.5 alloys." Physicochemical Mechanics of Materials 61, no. 3 (2025): 137–43. https://doi.org/10.15407/pcmm2025.03.137.

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The RMgNi3.5Mn0.5 (R – La, Pr, Nd) alloys were investigated as materials for negative electrodes of nickel-metal hydride (Ni–MH) batteries. The electrodes are characterized by discharge capacities of 237–291 mAh/g at charge-discharge current density of 30 mA/g. Cyclic voltammetry showed that the main charge-discharge reactions correspond to single-stage hydrogenation and dehydrogenation processes. The cycle stability of the electrode materials was investigated at a charge-discharge current density of 200 mA/g. Electrodes based on PrMgNi3.5Mn0.5 and NdMgNi3.5Mn0.5 exhibit high-rate discharge ab

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Rogiers, Jana, Tanya Deblaere, Xander van Heule, Bernd Ameel, Steven Lecompte, and Michel De Paepe. "Modelling of the refrigerant distribution in a critically charged propane heat pump cycle for performance evaluation." Journal of Physics: Conference Series 2766, no. 1 (2024): 012077. http://dx.doi.org/10.1088/1742-6596/2766/1/012077.

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Abstract The investigation of heat pumps employing natural refrigerants as working fluids has gained substantial momentum, driven by increasingly stringent regulations addressing the global warming potential (GWP) and ozone depletion potential (ODP) of refrigerants. Propane (R290) stands out as an attractive option due to its low GWP and zero ODP. However, a major drawback of propane lies in its flammability. When using propane as working fluid, it will therefore be necessary to limit the total refrigerant charge within the system, without compromising on the heat pump performance. This study

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Xue, Qian, and Xijuan Chen. "Optimization of Planar Array Electrostatic Sensor for Metal Surface Defect Detection." Journal of Physics: Conference Series 2370, no. 1 (2022): 012019. http://dx.doi.org/10.1088/1742-6596/2370/1/012019.

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Static electricity is usually generated in the damage area of the metal surface due to contact friction, and the charge distribution density can reflect the size, shape, and relative position of the damage area. Based on this, a planar array electrostatic sensor is designed to detect metal surface defect in this paper, and the shielding method, number of electrodes, electrode shape, and arrangement of the sensor are optimized taking account of the induced charge value, the uniformity of sensitivity and the image correlation coefficient. Different image reconstruction algorithms (e.g. Landweber

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Si, Qianli, Shoichi Matsuda, Youhei Yamaji, Toshiyuki Momma, and Yoshitaka Tateyama. "Predicting Cycle Life of Lithium Metal Batteries Using Discharge/Charge Capacity and Voltage Relaxation Features Via Machine Learning." ECS Meeting Abstracts MA2024-02, no. 3 (2024): 391. https://doi.org/10.1149/ma2024-023391mtgabs.

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Introduction Precise estimation of battery cycle life is crucial for assessing quality and planning long-term battery management systems. Given the nonlinear nature of battery degradation, early and accurate cycle life prediction amid minimal degradation is exceptionally difficult. Machine learning (ML) methods, independent of specific mechanisms, can offer promising alternatives for predicting battery lifespan1. Li metal anode battery (LMB) is a promising next-generation battery because of the high energy density, whereas the safety concern with complex degradation mechanisms is still a cruci

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Xingcai, Lu, Ji Libin, Ma Junjun, and Huang Zhen. "Experimental study on the cycle-by-cycle variations of homogeneous charge compression ignition combustion using primary reference fuels and their mixtures." Proceedings of the Institution of Mechanical Engineers, Part D: Journal of Automobile Engineering 221, no. 7 (2007): 859–66. http://dx.doi.org/10.1243/09544070jauto481.

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In this paper, the combustion stabilities and cycle-by-cycle variations of homogeneous charge compression ignition (HCCI) combustion using neat n-heptane, PRF20, PRF40, PRF50, and PRF60 were investigated. In-cylinder pressures of 100 combustion cycles for each test fuel on a single-cylinder engine were recorded. Consequently, cycle-to-cycle variations of the main combustion parameters and performance parameters were analysed, and the interdependency between the combustion parameter and performance parameters were also evaluated. The results reveal that the cycle-by-cycle variations deteriorate

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Tong, Xiangling, Junyuan Zhong, Xinxin Hu, and Fan Zhang. "Preparation and Performance of Highly Stable Cathode Material Ag2V4O11 for Aqueous Zinc-Ion Battery." Crystals 13, no. 4 (2023): 565. http://dx.doi.org/10.3390/cryst13040565.

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One of the hottest research topics at present is the construction of environmentally friendly and secure aqueous zinc-ion batteries (AZIBs) using an aqueous electrolyte instead of an organic electrolyte. As a result of their diverse structure, valence state, high theoretical specific capacity, and other benefits, vanadium-based materials, which are frequently employed as the cathode of AZIBs, have drawn the attention of many researchers. The low cycle stability of zinc ion batteries (ZIBs) is mostly caused by the disintegration of the vanadium-based cathode materials during continuous charge a

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Jeon, Min-Ju. "Experimental Analysis of the R744/R404A Cascade Refrigeration System with Internal Heat Exchanger. Part 1: Coefficient of Performance Characteristics." Energies 14, no. 18 (2021): 6003. http://dx.doi.org/10.3390/en14186003.

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This study evaluates the performance of an R744/R404A cascade refrigeration system (CRS) with internal heat exchangers (IHE) in supermarkets. R744 is used as the refrigerant in a low-temperature cycle, and R404A is used as the refrigerant in a high-temperature cycle. In previous studies, there are many studies including theoretical performance analysis of the CRS. However, experimental studies on the CRS are lacking, and experimental research on the R744/R404A system with an IHE is scarce. Therefore, this study provides basic data for optimal refrigeration system design by experimentally evalu

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Bramlage, Silke, and Klaus-Jürgen Wolter. "Effects of Vapor Phase Soldering on the Properties of Piezoceramic Materials." Additional Conferences (Device Packaging, HiTEC, HiTEN, and CICMT) 2012, CICMT (2012): 000603–5. http://dx.doi.org/10.4071/cicmt-2012-tha24.

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Eight different PZT (lead zirconate titanate) materials (Navy Type I and II) with Curie temperatures between 250 °C and 350 °C were subjected to a standard vapor phase soldering process with a peak temperature of 240 °C for three cycles. As indicators for the depolarization, the piezoelectric charge coefficient (d33) and the coupling coefficient (keff) were measured both before and after each heat treatment. Our studies demonstrate reductions in piezoelectric properties between 5% and 20%, depending on the Curie temperature of the corresponding material. The effects of the second and third cyc

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Dannoun, Elham M. A., Shujahadeen B. Aziz, Sozan N. Abdullah, et al. "Characteristics of Plasticized Lithium Ion Conducting Green Polymer Blend Electrolytes Based on CS: Dextran with High Energy Density and Specific Capacitance." Polymers 13, no. 21 (2021): 3613. http://dx.doi.org/10.3390/polym13213613.

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The solution cast process is used to set up chitosan: dextran-based plasticized solid polymer electrolyte with high specific capacitance (228.62 F/g) at the 1st cycle. Fourier-transform infrared spectroscopy (FTIR) pattern revealed the interaction between polymers and electrolyte components. At ambient temperature, the highest conductive plasticized system (CDLG–3) achieves a maximum conductivity of 4.16 × 10−4 S cm−1. Using both FTIR and electrical impedance spectroscopy (EIS) methods, the mobility, number density, and diffusion coefficient of ions are measured, and they are found to rise as

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Mu, Deying, Yue Hou, Chunbo Che, Chenchen Li, Xinning Feng, and Jin Yue. "Short-term and High-performance Recycling of Cathode Material from Spent Lithium Ion Batteries." Advances in Engineering Technology Research 9, no. 1 (2023): 77. http://dx.doi.org/10.56028/aetr.9.1.77.2024.

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In the industrial practice of spent lithium-ion battery recycling, mechanical separation, pyrometallurgy and chemical dissolution technologies are often used to achieve the separation and recovery of cathode materials, but there are problems such as low material dissociation rate, low recovery rate, high energy consumption, serious lithium loss, and impurity ion embedding. In this paper, supercritical CO2 fluid was used to strengthen the separation of the cathode active material from the aluminum foil in the spent lithium-ion battery to achieve direct and efficient recovery of the active subst

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Saldaña, G., José Ignacio San Martín, F. J. Asensio, et al. "Cycle-Life Curves Determination and Modelling of Commercially Available Electric Vehicle Batteries." Renewable Energy and Power Quality Journal 19 (September 2021): 287–92. http://dx.doi.org/10.24084/repqj19.278.

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In recent decades, there has been a growing concern about the trend of global emissions, and in particular those of the transport sector. In this context, the electric vehicle is a promising technology, with some barriers still to be overcome. Among these deficiencies everything related to storage technology is found. In this sense, lithium-ion batteries are one of the options to be considered, although it is necessary to continuously monitor the state of health. Cycle life vs DoD curves are very useful for characterizing profitability in any application that considers battery storage, as well

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Konyukov, Vyacheslav Leontievich. "Influence of excessive air coefficient during combustion on intensity of two-stroke diesel engine operation in wide range of modes." Vestnik of Astrakhan State Technical University. Series: Marine engineering and technologies 2020, no. 3 (2020): 54–63. http://dx.doi.org/10.24143/2073-1574-2020-3-54-63.

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The article describes the specific features of the forced diesel engines operating on a helical characteristic. One of them is a decreasing coefficient of excessive air during combustion with a decreasing power. Reducing the air charge of the cylinder and its available work require a greater cyclic supply of fuel to provide a given power, which affects the engine efficiency. It is possible to increase the boost pressure and the mass of the air charge of the cylinder by acting on the adjustable nozzle apparatus of a turbo-charging unit. In this case, gas parameters significantly change over the

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Rahim, Ahmad Syahmi Abdul, Mohd Zieauddin Kufian, Abdul Kariem Mohd Arof, and Zurina Osman. "Variation of Li Diffusion Coefficient during Delithiation of Spinel LiNi0.5Mn1.5O4." Journal of Electrochemical Science and Technology 13, no. 1 (2022): 128–37. http://dx.doi.org/10.33961/jecst.2021.00780.

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For this study, the sol gel method was used to synthesize the spinel LiNi0.5Mn1.5O4 (LNMO) electrode material. Structural, morphological, electrochemical, and kinetic aspects of the LNMO have been characterized. The synthesized LNMO was indexed with the Fd3̄m cubic space group. The excellent capacity retention indicates that the spinel framework of LNMO has the ability to withstand high rate charge-discharge throughout long cycle tests. The Li diffusion coefficient (DLi) changes non-monotonically across three orders of magnitude, from 10−9 to 10−12 cm2 s−1 determined from GITT method. The vari

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Qi, Wanqiang. "Fuzzy control strategy of pure electric vehicle based on driving intention recognition." Journal of Intelligent & Fuzzy Systems 39, no. 4 (2020): 5131–39. http://dx.doi.org/10.3233/jifs-179998.

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The main reason that currently hinders the commercialization of electric vehicles is a bottleneck in battery, motor and electronic control technology, however, an In-depth study of electronic control technology is one of the most effective means to break through this bottleneck at present. The purpose of this paper is to solve the problem that the pure electric vehicle is difficult to meet the driver’s acceleration intention in the urban road cycle acceleration work condition and the brake energy recovery process does not consider the battery state of charge during the deceleration work condit

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Shchegolkov, Alexander V., F. F. Komarov, M. S. Lipkin, et al. "Synthesis and study of cathode materials based on carbon nanotubes for lithium-ion batteries." Perspektivnye Materialy 2 (2021): 66–76. http://dx.doi.org/10.30791/1028-978x-2021-2-66-76.

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This work presents a study of the conditions and possibilities for the intercalation of hexafluorophosphate anions into CNT-based electrodes. For this, cathodes based on CNTs synthesized on various (Co – Mo)/(Al2O3 – MgO) and (Fe – Co)/2.1Al2O3 catalysts were production. As a result, electrode materials were obtained at various concentrations of CNT/graphite: CNT-4F, CNT-6 and CNT-6F. The resulting electrodes were studied by cyclic voltammetry (CVA) in an electrolyte of a dissolved LiPF6 salt based on EC:DEC solvents (in the ratio 1: 1: 1) with an admixture of 3 % VC at a sweep speed of 4 mV/s

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Fujii, Yuta, Hiroaki Ito, Akira Miura, Nataly Carolina Rosero-Navarro, Kiyoharu Tadanaga, and Li Lu. "Fast discharge–charge properties of FePS3 electrode for all-solid-state batteries using sulfide electrolytes and its stable diffusion path." Functional Materials Letters 14, no. 03 (2021): 2141005. http://dx.doi.org/10.1142/s1793604721410058.

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We report the fast discharge–charge cycle of micro-sized FePS3 electrode particles in all-solid-state batteries (ASSBs) using sulfide electrolytes at 80∘C. At a current density of 2.04 mA cm[Formula: see text], corresponding to approximately 1 C, the capacity of the FePS3 electrodes reached [Formula: see text]180 mAh g[Formula: see text] without any electron or lithium-ion conductive additives. Galvanostatic intermittent titration technique (GITT) measurements showed a stable diffusion path of FePS3 represented by the product of the diffusion coefficient and square of the surface area. These e

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Organ, A. J. "Two-Dimensional Thermodynamic and Flow Analysis of the Simple Hot-Air Engine." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 202, no. 1 (1988): 31–38. http://dx.doi.org/10.1243/pime_proc_1988_202_083_02.

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Attention focuses on the annular gap between displacer and cylinder shell as the gas passes between expansion and compression spaces. Equations are formulated for velocity and temperature distributions as a function of time and the distance coordinate directions—radial and axial. Local, instantaneous entropy creation rates due to viscous dissipation and heat transfer are computed without the need to refer to the usual friction factor and coefficient of convective heat transfer. From considerations of exergy an estimate of indicated thermodynamic work per cycle follows. This is expressed in ter

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Fedosov, S. N., A. E. Sergeeva, H. Von Seggern, and Yu A. Nitsuk. "INTERRELATION BETWEEN PYROELECTRIC PROPERTIES AND RESIDUAL POLARIZATION IN POLYVINYLIDE FLUORIDE INTENDED FOR MAKING PYROELECTRIC SENSORS." Sensor Electronics and Microsystem Technologies 22, no. 1 (2025): 38–43. https://doi.org/10.18524/1815-7459.2025.1.325654.

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Pyroelectricity and fractional thermally stimulated depolarization currents (TSDC) were experimentally studied in polyvinylidene fluoride (PVDF) films poled by application of high DC field at room temperature. The obtained polarization is found to be less thermally stable than the correlated compensating charge. It is demonstrated by investigation of the charge balance and the pyroelectric coefficient measured during cooling in a fractional experiment, that trapped polarization-compensating charge is responsible for a partial realignment of polarization during cooling. The polarization and the

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Okafor, Ekene G., Emmanuel Okafor, Osichinaka C. Ubadike, Paul O. Jemitola, Mohammed T. Abba, and Gowom Sule. "PERFORMANCE EVALUATION OF AN ELECTRIC VEHICLE INTEGRATED WITH REGENERATIVE BRAKING SYSTEM USING PI CONTROLLER." Journal of Southwest Jiaotong University 56, no. 4 (2021): 697–708. http://dx.doi.org/10.35741/issn.0258-2724.56.4.59.

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Battery electric vehicles (BEVs) without regenerative braking mechanisms often suffer major drawbacks of limited driving range. Although extensive research works exist in electric vehicles integrated with regenerative braking, the performance evaluation of an electric ambulance, in the context of aerodynamic as well as energy recovery assessment from a complete vehicle modeling perspective based on the difference between the controlled dynamic speed and the drive cycle reference speed is not well reported. To compensate for the problem mentioned above, this paper aims to evaluate the performan

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Okafor, Ekene G., Emmanuel Okafor, Osichinaka C. Ubadike, Paul O. Jemitola, Mohammed T. Abba, and Gowom Sule. "PERFORMANCE EVALUATION OF AN ELECTRIC VEHICLE INTEGRATED WITH REGENERATIVE BRAKING SYSTEM USING PI CONTROLLER." Journal of Southwest Jiaotong University 56, no. 4 (2021): 697–708. http://dx.doi.org/10.35741/issn.0258-2724.56.4.59.

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Battery electric vehicles (BEVs) without regenerative braking mechanisms often suffer major drawbacks of limited driving range. Although extensive research works exist in electric vehicles integrated with regenerative braking, the performance evaluation of an electric ambulance, in the context of aerodynamic as well as energy recovery assessment from a complete vehicle modeling perspective based on the difference between the controlled dynamic speed and the drive cycle reference speed is not well reported. To compensate for the problem mentioned above, this paper aims to evaluate the performan

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Milano, Lorenzo, and Luca Magagnin. "Ultrasonic Monitoring of Li-Ion Batteries." ECS Meeting Abstracts MA2024-02, no. 70 (2024): 5086. https://doi.org/10.1149/ma2024-02705086mtgabs.

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To improve the accuracy of lithium-ion battery (LIB) monitoring, a recent trend involves using data that reflect changes in material properties caused by the intercalation and deintercalation of lithium ions. By focusing on specific layers within the battery, a broader array of information can be obtained to determine its state of charge (SoC) and health (SoH) locally. Since the speed of sound changes depending on the material properties and traveling waves are partly reflected at each interface, ultrasonic analysis (UA) offers the potential to enhance LIB monitoring by providing real-time, th

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Cho, chae-Ryong, Linghong Yin, Hong Chen, and Min-Seung Kang. "Synthesis, Characterization, and Lib Cell Performance of Chemically-Derived Pure Crystalline Fullerene C60." ECS Meeting Abstracts MA2024-02, no. 11 (2024): 1469. https://doi.org/10.1149/ma2024-02111469mtgabs.

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Buckminsterfullerene (C60), as an allotrope of carbon, is regarded as a potential anode material for lithium-ion batteries(LIBs). However, the poor crystallinity, low electrochemical reaction activity, and poor reversibility of lithium storage of C60 make it challenging to design efficient anode materials, and the relevant electrochemical reaction mechanisms still require in-depth study. Currently, many researches have been devoted to polymerized C60 and further modification through doping, hybridization, and derivatization to obtain high-performance C60-based anode materials. However, applica

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Edwin, Gevorkyan, Nerubatskyi Volodymyr, Gutsalenko Yuriy, Melnik Olga, and Voloshyna Liudmyla. "Examination of patterns in obtaining porous structures from submicron aluminum oxide powder and its mixtures." Eastern-European Journal of Enterprise Technologies 6, no. 6(108) (2020): 41–49. https://doi.org/10.15587/1729-4061.2020.216733.

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This paper proposes an economical thermal cycle of the production of ceramic articles from submicronic powders of aluminum oxide, titanium oxide, and manganese oxide. The implementation of a given cycle involves the introduction of a special aluminophosphate bond into the charge in order to reduce the temperature of firing. The optimal composition of the material for a foam-ceramic filter with the highest physical and mechanical properties has been determined; the optimal method for preparing the original charge and the baking mode have been selected. According to the results of tests under in

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Soshi, Kodama, Kosuke Kawai, Okazawa Atsushi, and Masashi Okubo. "Highly-Coordinated Iron Complex with Multidentate Ligands for Aqueous Redox Flow Battery Electrolytes." ECS Meeting Abstracts MA2024-02, no. 67 (2024): 4525. https://doi.org/10.1149/ma2024-02674525mtgabs.

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Redox flow batteries (RFBs) possess a longer cycle life than other secondary batteries owing to their limited electrode deterioration upon charge/discharge cycling. Commercial RFBs use vanadium ions as active materials, resulting in a high cost. Therefore, more abundant and less expensive iron-based complexes are desirable as catholyte active materials for RFBs. However, to develop stable iron-based aqueous electrolytes, precipitation of ferric hydroxides under a mild alkaline condition should be suppressed. One potential strategy is to use polydentate ligands that stabilizes the iron coordina

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Krishnamoorthy, Umapathi, Parimala Gandhi Ayyavu, Hitesh Panchal, et al. "Efficient Battery Models for Performance Studies-Lithium Ion and Nickel Metal Hydride Battery." Batteries 9, no. 1 (2023): 52. http://dx.doi.org/10.3390/batteries9010052.

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Apart from being emission-free, electric vehicles enjoy benefits such as low maintenance and operating costs, noise-free, easy to drive, and the convenience of charging at home. All these benefits are directly dependent on the performance of the battery used in the vehicle. In this paper, one-dimensional modeling of Li-ion and NiMH batteries was developed, and their performances were studied. The performance characteristics of the batteries, such as the charging and discharging characteristics, the constituent losses of over-potential voltage, and the electrolyte concentration profile at vario

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Brza, Mohamad, Shujahadeen Aziz, Hazleen Anuar, et al. "Characteristics of a Plasticized PVA-Based Polymer Electrolyte Membrane and H+ Conductor for an Electrical Double-Layer Capacitor: Structural, Morphological, and Ion Transport Properties." Membranes 11, no. 4 (2021): 296. http://dx.doi.org/10.3390/membranes11040296.

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Poly (vinyl alcohol) (PVA)-based solid polymer electrolytes doped with ammonium thiocyanate (NH4SCN) and glycerol were fabricated using a solution casting method. Lithium-based energy storage devices are not environmentally friendly materials, and they are toxic. Thus, proton-conducting materials were used in this work as they are harmless and are smaller than lithium. The interaction between PVA and the electrolyte elements was shown by FTIR analysis. The highest conductivity of 1.82 × 10−5 S cm−1 was obtained by the highest-conducting plasticized system (PSP_2) at room temperature. The mobil

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Zhang, Daning, Guanwei Long, Yang Li, Haibao Mu, and Guanjun Zhang. "Effect of Radial Moisture Distribution on Frequency Domain Dielectric Response of Oil-Polymer Insulation Bushing." Polymers 12, no. 6 (2020): 1219. http://dx.doi.org/10.3390/polym12061219.

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In order to realize the diagnosis of water distribution, this paper analyzes the interface polarization and macroscopic space charge polarization mechanism when the water distribution is non-uniform. The experimental results of this paper and bushing show that when the moisture distribution is non-uniform, there is a significant loss peak in the tanδ-f curve. The loss peak shifts to higher frequencies as the non-uniformity coefficient increases. There are common intersection points between multiple tanδ-f curves. Further, this paper realizes the diagnosis of the location of moisture distributi

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Zhou, Peng, Shiran Luo, Xinzhou Li, et al. "The Effects of Cycling Rates and Cycling Temperature on the Battery Degradation in Vehicle-to-Grid Applications." Science of Advanced Materials 12, no. 8 (2020): 1205–12. http://dx.doi.org/10.1166/sam.2020.3755.

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Commercial LiFePO4/graphite batteries produced by A123 Systems were cycled by simulating urban drive modes and vehicle-to-grid (V2G) modes at the 1 C and 2 C V2G discharge rates under 25 °C and 45 °C environmental temperature. Their degeneration was explored by characterization of capacity attenuation, electrochemical impedance spectroscopy (EIS), charge/discharge test of two half cells, BET Surface Area, XRD, FE-SEM and EDS. Results show that the capacity declines obviously with the rise of V2G discharge rates and environmental temperature. With the progress of the cycle test, the ohmic resis

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Dr., Boda Hadya*. "ANALYSIS OF VAPOUR COMPRESSION REFRIGERATION SYSTEM WITH SUB- COOLING AND SUPER HEATING WITH THREE DIFFERENT REFRIGERANTS FOR AIR-CONDITIONING APPLICATIONS." INTERNATIONAL JOURNAL OF ENGINEERING SCIENCES & RESEARCH TECHNOLOGY 5, no. 11 (2016): 70–77. https://doi.org/10.5281/zenodo.164904.

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This paper presents the simulated results of vapour compression system with sub-cooling and superheating and to compare the system performance for three refrigerants i.e. R22, R410A and R32. For simulation 1 “TR” (Ton of Refrigeration) capacity of air conditioning unit was considered and compared the performance with liquid sub cooling and vapour superheating at different temperature and pressures. For analysis R22 experimental results were considered and simulated for R410A and R32 refrigerants. The simulated results for sub-cooled in the refrigeration system positively affected the system pe

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Hribernik, Ales, and John J. Moskwa. "Transient Response of a Cross-Flow Charge Air Intercooler and Its Influence on Engine Operation." Journal of Dynamic Systems, Measurement, and Control 122, no. 3 (1998): 483–89. http://dx.doi.org/10.1115/1.1286683.

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To examine the influence of intercooler thermal inertia on transient engine operation, a 2D model of an air-to-air, cross-flow heat exchanger has been developed. Finned passages of heat exchanger core have been subdivided into separate channels of charge and cooling air, respectively. A two-step Lax-Wendroff differential method has been used to solve one-dimensional, nonhomentropic, unsteady, compressible fluid flow in each channel. Simultaneously, the Saul’yev explicit method has been applied to compute the 2D temperature distribution along the dividing plate. The Wieting correlation has been

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Casiez, Lara, Christophe Secouard, Jacopo Cele', et al. "In-Situ Confocal Microscopy to Analyze Volume Expansion of Solid State Microbatteries." ECS Meeting Abstracts MA2023-02, no. 1 (2023): 95. http://dx.doi.org/10.1149/ma2023-02195mtgabs.

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The rise of embedded objects put great interests in miniaturized power supply solutions. Solid State Microbatteries (SSM) are the most promising, as they can safely store high energy and power density. SSM have the advantage of being all-solid (no liquid leakage and flammability), to have low self-discharge and good cyclability. Despite the strong interest in the field, the mechanisms of Li plating and stripping at the anode are not well observed and not yet fully understood [1]. The study of these phenomena would bring new insights to mechanical behavior during cycling and therefore may lead

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Zhao, Yu, Zhaogang Qi, Jiangping Chen, Baixing Xu, and Bin He. "Experimental analysis of the low-GWP refrigerant R1234yf as a drop-in replacement for R134a in a typical mobile air conditioning system." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 226, no. 11 (2012): 2713–25. http://dx.doi.org/10.1177/0954406211435583.

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This study investigated the performance of a typical mobile air conditioning system using R134a and R1234yf as the working fluids under different working conditions. The system is composed of a microchannel parallel flow condenser, a laminated plate evaporator, a variable displacement compressor, and a thermal expansion valve. The different working cycles of each refrigerant were comprehensively compared. The optimum refrigerant charge amount of the R1234yf system was approximately 95% of the R134a system during drop-in tests. The performance of the R134a system was a little higher than that o

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Moon, Jung Hyeon, Hyeonmuk Kang, GyuSeong Hwang, Junho Lee, GeunHyeong Shin, and EunAe Cho. "Li₂So₄ Coating of Co-Free, Li-Rich Layered Oxide Cathodes through a Carbonate Coating Method for Improving Cycle Performance." ECS Meeting Abstracts MA2023-01, no. 55 (2023): 2671. http://dx.doi.org/10.1149/ma2023-01552671mtgabs.

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In the continued evolution toward high-performance lithium-ion batteries, cobalt has presented itself as a major obstacle due to its price and accessibility. Thus, Co-Free, Li-rich Layered Oxide Cathodes (CF-LLC) have become a promising cathode candidate for their exclusion of Cobalt and high theoretical capacity. Nevertheless, CF-LLC suffers from LLC issues such as phase transformation and voltage fade. Due to high overpotential from sluggish kinetics, the oxygen plateau of CF-LLC occurs at a higher-than-normal potential, leading to a shortened first cycle charge and lower discharge capacity.

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Yu, Shijin, Wenzhen Zhu, Ying Wei, et al. "Facile Synthesis of Multi-Channel Surface-Modified Amorphous Iron Oxide Nanospheres as High-Performance Anode Materials for Lithium-Ion Batteries." Energies 15, no. 16 (2022): 5974. http://dx.doi.org/10.3390/en15165974.

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Based on the synergistic effect of ripening and hydrogen ion etching in a hydrothermal solution, a simple, facile, and low-cost new strategy was demonstrated to prepare multi-channel surface-modified amorphous Fe2O3 nanospheres as anodes for Li-ion batteries in this study. Compared with polycrystalline Fe2O3, the conversion reaction between amorphous Fe2O3 and lithium ions has a lower Gibbs free energy change and a stronger reversibility, which can contribute to an elevation in the cycle capability of the electrode. Meanwhile, there are abundant active sites and more effective dangling bonds/d

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Park, Byoung-Nam. "Differential Analysis of Surface-Dominated vs. Bulk-Dominated Electrochemical Processes in Lithium Iron Phosphate Cathodes." Korean Journal of Metals and Materials 62, no. 8 (2024): 624–30. http://dx.doi.org/10.3365/kjmm.2024.62.8.624.

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We employed electrophoretic deposition (EPD) using AC voltage to prepare lithium iron phosphate (LFP) Li-ion battery electrodes with varying the LFP thickness, to compare bulk-limited electro chemical reaction with the surface-limited electrochemical reactions. We analyzed the electrochemical performances of the thin and thick LFP electrodes at various scan rates. They revealed that with increasing scan rates, both electrode types showed a greater reliance on surface capacitive effects for charge storage. Significantly, the thin LFP electrode predominantly exhibited capacitive charge storage,

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Jeon, Min-Ju, and Joon-Hyuk Lee. "Thermodynamic Comparative Analysis of Cascade Refrigeration System Pairing R744 with R404A, R448A, and R449A with Internal Heat Exchanger: Part 1—Coefficient of Performance Characteristics." Energies 17, no. 17 (2024): 4481. http://dx.doi.org/10.3390/en17174481.

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The R744/R404A cascade refrigeration system (CRS) has been widely used in supermarkets and hypermarkets, but due to the refrigerant regulation of R404A, research on alternative refrigerants is necessary. In addition, although there have been quite a few studies on R448A and R449A, which are well-known alternatives to R404A, few studies have analyzed the performance coefficients of the three refrigerants, and the studies that have analyzed them are not based on enough variables. Therefore, we aimed to understand the performance characteristics of CRS combined with an internal heat exchanger (IH

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Zhang, Dong Yun, Li Zhang, Pei Xin Zhang, et al. "Modification of LiFePo₄ by Citric Acid Coating and Nb⁵⁺ Doping." Advanced Materials Research 158 (November 2010): 167–73. http://dx.doi.org/10.4028/www.scientific.net/amr.158.167.

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In order to improve the electrochemical performance of LiFePO4, Li0.99Nb0.01FePO4/C composite materials were synthesized with citric acid coating and Nb2O5 doping. The physical chemistry and electrochemical performances of Li0.99Nb0.01FePO4/C were investigated by X-Ray diffraction (XRD) and Transmission electron microscope (TEM). The results show that Li0.99Nb0.01FePO4/C has smooth charge-discharge voltage platform, with first capacity of 151.6 mAh•g-1 (0.1C) and no obvious capacity fading after 16 cycles. The materials have favorable high rate discharge performances, with the first capacity o

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Lee, Jun-Seok, Sang-Du Yun, Oyunbayar Nyamaa, et al. "Free-Standing Li4Ti5O12/Carbon Nanotube Electrodes for Flexible Lithium-Ion Batteries." Energies 15, no. 22 (2022): 8585. http://dx.doi.org/10.3390/en15228585.

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Lithium-ion batteries (LIBs) have been used in many fields, such as consumer electronics and automotive and grid storage, and its applications continue to expand. Several studies have attempted to improve the performance of LIBs. In particular, the use of high-capacity silicon and tin as anodes has been widely studied. Although anodes composed of silicone and tin have high theoretical capacities, poor electrical conductivity and considerable volume expansion of such anodes deteriorate the LIB performance. Thus, Li4Ti5O12 (LTO), a zero-strain material, has attracted much attention with high cyc

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Meng, Xiangdong, Wei Wang, Xinyu Cao, Gang Li, and Dexing Li. "A RUL Prediction Method of Lithium-ion Battery Based on Extreme Learning Machine." Journal of Physics: Conference Series 2492, no. 1 (2023): 012026. http://dx.doi.org/10.1088/1742-6596/2492/1/012026.

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Abstract Owing to the complexity of the electrochemical reaction types in lithium-ion batteries and the characteristics of nonlinear degradation, using physical models to describe the degradation process is often not accurate enough. This paper only analyzes from the perspective of data, through a data-driven method, extreme learning machine ( ELM ), to predict the remaining useful life (RUL) of lithium-ion. Firstly, the cycle charge and discharge data of lithium-ion battery are analyzed in depth to find the parameters which can indirectly characterize the degree of degeneracy of lithium-ion b

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Liu, Heng-Jui, Yi-Chen Ye, and Yun-Wei Tsai. "Leveraging Functional High-Entropy Oxide Perovskites for Enhanced Piezocatalytic Degradation." ECS Meeting Abstracts MA2024-02, no. 39 (2024): 2606. https://doi.org/10.1149/ma2024-02392606mtgabs.

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The escalating prevalence of water scarcity resulting from extreme climate events highlights a critical global challenge. This scarcity emphasizes the need for wastewater recycling, emphasizing the pivotal role of the water cycle in sustaining life and ecosystems. Among various wastewater treatment processes, chemical methods stand out for their high pollutant removal efficiency, scalability, and versatility in addressing diverse wastewater types. Advanced Oxidation Processes (AOPs) are particularly favored due to their low energy consumption, minimal equipment requirements, and superior remed

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Muggeridge, David Joseph, Kirsty Hickson, Aimie Victoria Davies, et al. "Measurement of Heart Rate Using the Polar OH1 and Fitbit Charge 3 Wearable Devices in Healthy Adults During Light, Moderate, Vigorous, and Sprint-Based Exercise: Validation Study." JMIR mHealth and uHealth 9, no. 3 (2021): e25313. http://dx.doi.org/10.2196/25313.

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Background Accurate, continuous heart rate measurements are important for health assessment, physical activity, and sporting performance, and the integration of heart rate measurements into wearable devices has extended its accessibility. Although the use of photoplethysmography technology is not new, the available data relating to the validity of measurement are limited, and the range of activities being performed is often restricted to one exercise domain and/or limited intensities. Objective The primary objective of this study was to assess the validity of the Polar OH1 and Fitbit Charge 3

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Cervellieri, Alice. "A Feed-Forward Back-Propagation Neural Network Approach for Integration of Electric Vehicles into Vehicle-to-Grid (V2G) to Predict State of Charge for Lithium-Ion Batteries." Energies 17, no. 23 (2024): 6107. https://doi.org/10.3390/en17236107.

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The accurate prediction and efficient management of the State of Charge (SoC) of electric vehicle (EV) batteries are critical challenges in the integration of vehicle-to-grid (V2G) systems within multi-energy microgrid (MMO) models. Inaccurate SoC estimation can lead to inefficiencies, increased costs, and potential disruptions in power generation. This paper addresses the problem of optimizing SoC estimation to enhance the reliability and efficiency of V2G scheduling and MMO coordination. In this work, we develop a Feed-Forward Back-Propagation Network (FFBPN) using MATLAB 2024 software, empl

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Thorsteinsson, Gunnar, Wesley Chang, Andrew Wang, Zoe Herman, Libby Katzman, and Daniel A. Steingart. "Pinpointing the Blip: Coupled Transient Chemo-Mechanical Properties in Lithium-Metal Batteries." ECS Meeting Abstracts MA2023-02, no. 4 (2023): 654. http://dx.doi.org/10.1149/ma2023-024654mtgabs.

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Lithium-metal batteries experience significant mechanical stress as lithium is plated and stripped from the copper current collector during charge and discharge, respectively. Minimizing the negative effects of this stress on cell’s capacity retention over its cycle life is paramount to propel the high-density chemistry to the mainstream. To address this, acoustics have recently emerged as a viable experimental tool to monitor chemo-mechanical properties*.* In this work, we probe the underlying effects of coupled transient phenomena previously reported for Lithium-ion cells. By complimenting p

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Almafie, Muhammad Rama, Rahma Dani, Riyanto Riyanto, Leni Marlina, Jaidan Jauhari, and Ida Sriyanti. "Preparation of PAN/PVDF Nanofiber Mats Loaded with Coconut Shell Activated Carbon and Silicon dioxide for Lithium-Ion Battery Anodes." Science and Technology Indonesia 9, no. 2 (2024): 427–47. http://dx.doi.org/10.26554/sti.2024.9.2.427-447.

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Utilizing carbon materials derived from natural biomass holds significant promise for battery applications, owing to their low cost, abundant availability, and environmentally sustainable characteristics. However, graphite anode materials do not meet the demands of efficient batteries. Coconut shell waste has the potential to be used as activated carbon in energy storage anodes. By adding silicon dioxide (SiO2) to maintain structural stability and electrochemical reaction kinetics, the advantages of CCS can be maximized. Polyacrylonitrile/polyvinylidene fluoride (PAN/PVDF) composite polymer wa

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Уханов, Александр, Aleksandr Ukhanov, Денис Уханов, et al. "FEATURES OF THE DIESEL RUNNING BY CAMELINA-MINERAL FUEL IN THE MODE OF INDEPENDENT IDLING." Bulletin Samara State Agricultural Academy 2, no. 3 (2017): 15–19. http://dx.doi.org/10.12737/17446.

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The mode of independent idling, characterized by an impaired process flow, unproductive fuel consumption and increased emissions of harmful substances into the atmosphere, is the most unfavorable mode of the diesel engine operation. Therefore, the aim of the research is to reveal the peculiarities of the tractor diesel engine operation by the camelina-mineral fuel in the mode of independent idling. Camelina-mineral fuel is a mixture of camelina oil and mineral diesel fuel in certain ratio of these components. To assess the possibility of using the camelina oil as biological component of diesel

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Le, Nhan Thanh, Phuc Hoang Dam, Tai Minh Hue Le, S. V. Kharytonchyk, V. A. Kusyak, and Cong Thanh Nguyen. "The Influence of Road Adhesion Coefficient on Energy Consumption and Dynamics of Battery Electric Vehicles." Science & Technique 23, no. 2 (2024): 151–62. http://dx.doi.org/10.21122/2227-1031-2024-23-2-151-162.

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Currently, in economically developed countries, electric vehicles are considered as a solution to the problematic issue of reducing greenhouse gas emissions from road vehicles. The level of energy consumption is a critical factor in determining the overall performance of an electric vehicle. The article analyzes the influence of tire adhesion coefficient on the energy consumption of a battery electric vehicle when operating in typical standard driving cycles. In order to estimate the energy consumption during driving with different tire adhesion coefficients an electric vehicle longitudinal dy

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Geng, Cong, Dawen Ning, Linfu Guo, Qicheng Xue, and Shujian Mei. "Simulation Research on Regenerative Braking Control Strategy of Hybrid Electric Vehicle." Energies 14, no. 8 (2021): 2202. http://dx.doi.org/10.3390/en14082202.

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This paper proposes a double layered multi parameters braking energy recovery control strategy for Hybrid Electric Vehicle, which can combine the mechanical brake system with the motor brake system in the braking process to achieve higher energy utilization efficiency and at the same time ensure that the vehicle has sufficient braking performance and safety performance. The first layer of the control strategy proposed in this paper aims to improve the braking force distribution coefficient of the front axle. On the basis of following the principle of braking force distribution, the braking for

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Zhuang, Ruiyuan, Shanshan Yao, Maoxiang Jing, et al. "Synthesis and characterization of electrospun molybdenum dioxide–carbon nanofibers as sulfur matrix additives for rechargeable lithium–sulfur battery applications." Beilstein Journal of Nanotechnology 9 (January 24, 2018): 262–70. http://dx.doi.org/10.3762/bjnano.9.28.

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One-dimensional molybdenum dioxide–carbon nanofibers (MoO2–CNFs) were prepared using an electrospinning technique followed by calcination, using sol–gel precursors and polyacrylonitrile (PAN) as a processing aid. The resulting samples were characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), Raman spectroscopy, Brunauer–Emmet–Teller (BET) surface area measurements, scanning electron microscopy (SEM) and transmission electron microscopy (TEM). MoO2–CNFs with an average diameter of 425–575 nm obtained after heat treatment were used as a matrix to prepare sulf

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