Journal of Physics-Photonics最新文献_第6页

Simulation Analysis Based on COMSOL Helicopter Time-domain Aeromagnetic Method 基于COMSOL直升机时域航磁法的仿真分析

Journal of Physics-Photonics Pub Date : 2023-11-01 DOI: 10.1088/1742-6596/2636/1/012033

Rui Su, Yiming Zhang, Dong Zhang, Junxia Gao

引用次数: 0

A Novel Temperature Compensation Method for Surface Strain of Cylindrical Lithium-ion Batteries 圆柱形锂离子电池表面应变的温度补偿方法

Journal of Physics-Photonics Pub Date : 2023-11-01 DOI: 10.1088/1742-6596/2636/1/012002

Rong Yao Sun, Lei Mao

{"title":"A Novel Temperature Compensation Method for Surface Strain of Cylindrical Lithium-ion Batteries","authors":"Rong Yao Sun, Lei Mao","doi":"10.1088/1742-6596/2636/1/012002","DOIUrl":"https://doi.org/10.1088/1742-6596/2636/1/012002","url":null,"abstract":"Abstract In order to ensure the safe operation of lithium-ion batteries, real-time monitoring of battery status is necessary. The surface strain signal of lithium-ion batteries has the potential to evaluate the battery’s state, but it is significantly affected by temperature. Generally, measuring the battery surface temperature and the thermal expansion coefficient can be performed to quantify and eliminate the influence of temperature on strain, but this increases the cost and complexity of strain measurement. This article proposes a method that eliminates the need to measure the battery temperature and material parameters. By simultaneously measuring the circumferential and axial strains on the battery surface and calculating their difference, the influence of temperature on strain can be minimized. Furthermore, the effectiveness of the proposed method is experimentally tested. Results demonstrate that after applying temperature compensation to commercial lithium-ion batteries, the influence of temperature on strain can be reduced from 16.4 ppm/°C to 1.7 ppm/°C. The strain no longer exhibits sensitivity to current, making it more suitable for evaluating the state of lithium-ion batteries.","PeriodicalId":44008,"journal":{"name":"Journal of Physics-Photonics","volume":"23 4","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135763662","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Digitization of production line equipment of rail transit vehicles based on index and model 基于指标和模型的轨道交通车辆生产线设备数字化研究

Journal of Physics-Photonics Pub Date : 2023-11-01 DOI: 10.1088/1742-6596/2632/1/012031

Hongyue Zhang, Jie Chang

引用次数: 0

Regional electrical energy substitution potential prediction based on time series and improved back propagation neural network 基于时间序列和改进的反向传播神经网络的区域电能替代电位预测

Journal of Physics-Photonics Pub Date : 2023-11-01 DOI: 10.1088/1742-6596/2636/1/012029

Ziwen Cai, Yutao Xu, Yong Xiao, Dunhui Chen, Yun Zhao, Zhukui Tan

引用次数: 0

Characteristics of Fly Ash as a Constituent Material for Geopolymer 粉煤灰作为地聚合物组成材料的特性研究

Journal of Physics-Photonics Pub Date : 2023-11-01 DOI: 10.1088/1742-6596/2623/1/012005

N Chairunnisa, N H Haryanti, R Nurwidayati, A Y Pratiwi, Y Arnandha, Y Saputra, N Hazizah

{"title":"Characteristics of Fly Ash as a Constituent Material for Geopolymer","authors":"N Chairunnisa, N H Haryanti, R Nurwidayati, A Y Pratiwi, Y Arnandha, Y Saputra, N Hazizah","doi":"10.1088/1742-6596/2623/1/012005","DOIUrl":"https://doi.org/10.1088/1742-6596/2623/1/012005","url":null,"abstract":"Abstract Fly ash waste from the Asam-Asam Power Plant in South Kalimantan continues to increase. Various attempts have been made to utilize fly ash waste, among others. as a basic material for making geopolymers. Geopolymer is environmentally friendly because it replaces all cement with high Silica (Si) and Alumina (Al) wastes such as fly ash. This study aims to characterize fly ash as a raw material of geopolymer. Fly ash was filtered using 200 mesh and then heated in an oven at 105°C for 24 hours. The prepared fly ash was then tested for physical properties and compound analysis using XRF, identification of chemical bonds and functional groups using FTIR, morphology, and elements using SEM EDX. Initial and final setting time was investigated using the Vicat apparatus to determine e whether cement is undergoing proper hydration. The results indicated that the fly ash was classified to class F. That was based on the amount of SiO 2 + Al 2 O 3 + Fe 2 O 3 of 85.91%, and the CaO content was less than 10%. Moreover, fly ash’s initial and final setting time was 1072.5 and 3180 minutes, respectively. Fly ash in this research can be used as a raw material for geopolymers.","PeriodicalId":44008,"journal":{"name":"Journal of Physics-Photonics","volume":"28 3","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135763773","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Design and engineering application of a new type of copper bar-embedded metering box based on DFA theory 一种基于DFA理论的新型铜棒嵌入式计量箱的设计与工程应用

Journal of Physics-Photonics Pub Date : 2023-11-01 DOI: 10.1088/1742-6596/2636/1/012008

Zhiru Chen, Xi Zhao, Zhi Zhang, Zhen Jing

引用次数: 0

Lead-free Perovskites TlGeCl_xBr_3-x (x=0,1,2,3) as Promising Materials for Solar Cell Application: a DFT Study 无铅钙钛矿TlGeClxBr3-x (x=0,1,2,3)作为太阳能电池材料的DFT研究

Journal of Physics-Photonics Pub Date : 2023-11-01 DOI: 10.1088/1742-6596/2623/1/012002

R K Pingak, A Z Johannes, N U J Hauwali, U A Deta

{"title":"Lead-free Perovskites TlGeCl<sub>x</sub>Br<sub>3-x</sub> (x=0,1,2,3) as Promising Materials for Solar Cell Application: a DFT Study","authors":"R K Pingak, A Z Johannes, N U J Hauwali, U A Deta","doi":"10.1088/1742-6596/2623/1/012002","DOIUrl":"https://doi.org/10.1088/1742-6596/2623/1/012002","url":null,"abstract":"Abstract This study investigates the structural parameters and the electronic properties of cubic TlGeCl x Br 3-x (x=0,1,2,3) lead-free perovskites to evaluate their potential as absorbers in perovskite solar cell devices. Density Functional Theory (DFT) embedded in the Quantum Espresso code was used to calculate these properties. The results revealed that the compounds have optimized lattice constants of 5.244 Å, 5.336 Å, 5.416 Å, and 5.501 Å, for TlGeCl 3 , TlGeCl 2 Br, TlGeClBr 2 , and TlGeBr 3 perovskites, respectively. In addition, the compounds are direct band gap (R → R) semiconductors with energy gap values of 0.847 eV, 0.683 eV, 0.556 eV, and 0.518 eV for the respective materials. It is important to note that the band gap of the perovskites reduces as a Cl − ion, two and three Cl − ions are replaced by a Br − ion, two and three Br − ions, respectively. The analysis of their projected density of states indicated that near the valence band maximum of the perovskites, Cl-3p and Br-4p states contributes the most to their total DOS. In contrast, the Ge-4p orbital is the most dominant state close to the conduction band minimum. Based on these energy gap values, the studied materials are promising candidates for lead-free perovskite solar cell devices, with TlGeBr 3 projected to be more promising than the other three materials.","PeriodicalId":44008,"journal":{"name":"Journal of Physics-Photonics","volume":"30 5","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135763908","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

University Students’ Perspectives on Physics Education in Sustainable Development Goals 可持续发展目标下的大学生物理教育观

Journal of Physics-Photonics Pub Date : 2023-11-01 DOI: 10.1088/1742-6596/2623/1/012001

N Suprapto, H N Hidaayatullaah

引用次数: 0

Analysis of annual power and electricity balance of hydro-thermal system in Yunnan province based on rolling dispatch with leading reservoir 基于超前水库滚动调度的云南省水热系统年电力平衡分析

Journal of Physics-Photonics Pub Date : 2023-11-01 DOI: 10.1088/1742-6596/2636/1/012035

Hongyu Pan, Zhenyu Zhao, Congtong Zhang, Kai Chen, Han Zhou, Shuangquan Liu, Qiyu Yang, Tianyu Jin

引用次数: 0

Reentry trajectory design of a hypersonic vehicle based on reinforcement learning 基于强化学习的高超声速飞行器再入弹道设计

Journal of Physics-Photonics Pub Date : 2023-11-01 DOI: 10.1088/1742-6596/2633/1/012005

Partha P Das, Wang Pei, Chenxi Niu

{"title":"Reentry trajectory design of a hypersonic vehicle based on reinforcement learning","authors":"Partha P Das, Wang Pei, Chenxi Niu","doi":"10.1088/1742-6596/2633/1/012005","DOIUrl":"https://doi.org/10.1088/1742-6596/2633/1/012005","url":null,"abstract":"Abstract In this research, we investigate control of a hypersonic vehicle (HV) following its reentry into the Earth’s atmosphere, using deep reinforcement learning (DRL) in a continuous space. Here, we incorporate the basic kinematic and force equations of motion for a vehicle in an atmospheric flight to formulate the reentry trajectory satisfying the boundary constraints and multiple mission related process constraints. The aerodynamic model of the vehicle emulates the properties of a common aero vehicle (CAV-H), while the atmospheric model of the Earth represents a standard model based on US Standard Atmosphere 1976, with significant simplification to the planetary model. In an unpowered flight, we then control the vehicle’s trajectory by perturbing its angle of attack and bank angle to achieve the desired objective, where the control problem is based on different actor-critic frameworks that utilize neural networks (NNs) as function approximators to select and evaluate the control actions in continuous state and action spaces. First, we train the model following each of the methods, that include on-policy proximal policy approximation (PPO) and off-policy twin delayed deterministic policy gradient (TD3). From the trajectory generated, we select a nominal trajectory for each algorithm that satisfies our mission requirements based on the reward model.","PeriodicalId":44008,"journal":{"name":"Journal of Physics-Photonics","volume":"31 9","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135764044","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0