Engineering Research Express最新文献

CO ₂ mineralization fixation and performance enhancement of silicate cement paste 硅酸盐水泥浆体的CO 2矿化固定及性能提高

Engineering Research Express Pub Date : 2026-01-01 DOI: 10.1088/2631-8695/ae3453

Dongfang Li, Zengyang Huang, Lichun Zhou, Ruijie Jian, Zhaobin Gong, Wentao Fu, Haibin Lin, Fangzan Luo, Xuyang Chen, Wenjun Zhou, Limin Ye, Zhang Zheng

{"title":"CO 2 mineralization fixation and performance enhancement of silicate cement paste","authors":"Dongfang Li, Zengyang Huang, Lichun Zhou, Ruijie Jian, Zhaobin Gong, Wentao Fu, Haibin Lin, Fangzan Luo, Xuyang Chen, Wenjun Zhou, Limin Ye, Zhang Zheng","doi":"10.1088/2631-8695/ae3453","DOIUrl":"https://doi.org/10.1088/2631-8695/ae3453","url":null,"abstract":"Abstract Silicate cement has a huge market demand because it is widely used in construction, transportation and other infrastructures. It has become a current research hotspot how to ensure its performance while meeting the requirements of environmental protection. To this end, the study used PO42.5 silicate cement as the base material, and adopted the solid-carbon enhanced mixing method by introducing gaseous CO 2 and solid CO 2 (dry ice) as the mineralization medium. The effects of CO 2 mineralization on the hydration behavior and mechanical properties of cement paste were systematically evaluated. The experimental results showed that the mineralization rate and carbon sequestration capacity of the ready-mixed concrete samples were optimal when the water-cement ratio was 0.2, and the final carbon sequestration rate was 8.1 wt%. Under 10% silica doping, the optimal water-solid ratio was 0.22, the reaction rate constant was 0.163 min −1 , and the delay time was shortened to 1.1 min. In addition, the ready-mixed concrete samples showed limited CO 2 uptake when conventional mixing methods were used. The overall carbon sequestration reaction rate was low, and the final carbon sequestration rate was 0.68 wt% of the cement mass. In contrast, the CO 2 uptake capacity was significantly enhanced when using the sequestration-enhanced mixing method, and the final carbon sequestration rate reached 3.18 wt%. In conclusion, the carbon sequestration mixing method designed by the study can significantly improve the CO 2 absorption efficiency and mineralization rate of cement paste. Moreover, it can also provide a practical technical path to realize the development of green and low-carbon building materials.","PeriodicalId":11753,"journal":{"name":"Engineering Research Express","volume":"8 2","pages":"025001-025001"},"PeriodicalIF":0.0,"publicationDate":"2026-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147882950","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

Multi-regional economic dispatch and demand response optimization in smart grids: a reinforcement learning approach for economic efficiency and strategic decision-making 智能电网中的多区域经济调度和需求响应优化：一种经济效率和战略决策的强化学习方法

Engineering Research Express Pub Date : 2025-12-05 DOI: 10.1088/2631-8695/ae28bb

Sun Xinguo, Anbang Peng, Shuyi Ma, Xingyue Jin, Yi Shi, Zhi Qu, Nan Xiao

{"title":"Multi-regional economic dispatch and demand response optimization in smart grids: a reinforcement learning approach for economic efficiency and strategic decision-making","authors":"Sun Xinguo, Anbang Peng, Shuyi Ma, Xingyue Jin, Yi Shi, Zhi Qu, Nan Xiao","doi":"10.1088/2631-8695/ae28bb","DOIUrl":"https://doi.org/10.1088/2631-8695/ae28bb","url":null,"abstract":"Abstract Economic demands introduce new energy vehicles and smart buildings diversity, randomness, and flexibility into smart grid (SG) electricity consumption, posing significant challenges for energy management and demand response (DR) optimization. This study formulates the price-based demand response (PbDR) problem as a two-level optimization model to address dynamic retail pricing for utilities and optimal consumption for load units. We employ reinforcement learning (RL) schemes to simultaneously determine the optimal dynamic electricity price and the corresponding optimal energy consumption strategy. Simulations study demonstrate that the proposed model exhibits an interesting total utility revenue and a valuable total load cost. Proposed model achieves interesting performance deviation compared to a random parameter method and outperforms five other benchmark schemes. The results indicate that the RL-based PbDR model is highly effective in navigating unknown electricity market environments and maximizes social welfare under uncertainty.","PeriodicalId":11753,"journal":{"name":"Engineering Research Express","volume":"7 4","pages":"0453a5-0453a5"},"PeriodicalIF":0.0,"publicationDate":"2025-12-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147903566","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

Real time analysis of multi-level dual active bridge charger using quintuple phase shift modulation for battery energy storage system 电池储能系统中采用五倍移相调制的多级双有源桥式充电器实时分析

Engineering Research Express Pub Date : 2025-07-24 DOI: 10.1088/2631-8695/adf418

Khurshid Ul Haq, Farhad Ilahi Bakhsh

{"title":"Real time analysis of multi-level dual active bridge charger using quintuple phase shift modulation for battery energy storage system","authors":"Khurshid Ul Haq, Farhad Ilahi Bakhsh","doi":"10.1088/2631-8695/adf418","DOIUrl":"https://doi.org/10.1088/2631-8695/adf418","url":null,"abstract":"Abstract This study presents on board charger system designed specifically for the purpose of charging and discharging of the batteries used in electric vehicles (EVs). The conventional charger used in the EVs consists a three phase AC-DC converter and a DC-DC converter. In bidirectional isolated converter mostly dual active bridge (DAB) is used. But this converter produces more harmonics in the inductor current due to which more heating in the transformers and inductor takes place regardless of the modulation methods employed. Hence, the efficiency of the EV charger reduces. Keeping these limitations of the conventional DAB charger, in this paper a multilevel dual active bridge (MLDAB) converter based charger with quintuple phase shift (QPS) modulation has been proposed for the application in EVs. The control technique used in the proposed EV charger offers an enhanced control approach that results in the improved performance, while simultaneously ensuring a unity power factor. The charging algorithm has been constructed in a manner that enables it to effectively maintain voltage at the DC link to 650V. Moreover the proposed EV charger has been compared with the conventional DAB chargers with different modulation schemes. The results show that proposed EV charger produce less harmonics in the inductor current and hence the efficiency of the proposed charger is more than the conventional DAB converter based EV charger. The obtained simulation results are then validated using real time OPAL-RT results.","PeriodicalId":11753,"journal":{"name":"Engineering Research Express","volume":"7 3","pages":"035332-035332"},"PeriodicalIF":0.0,"publicationDate":"2025-07-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147888034","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

Application of voltage controlled crystal oscillators to DC voltage reference validation. 压控晶体振荡器在直流电压基准验证中的应用。

IF 1.5

Engineering Research Express Pub Date : 2025-06-30 Epub Date: 2025-04-08 DOI: 10.1088/2631-8695/adc77e

Matthew T Spidell, Gaylon W Partain, Alan G Jaffe, Malcom G White, John H Lehman

{"title":"Application of voltage controlled crystal oscillators to DC voltage reference validation.","authors":"Matthew T Spidell, Gaylon W Partain, Alan G Jaffe, Malcom G White, John H Lehman","doi":"10.1088/2631-8695/adc77e","DOIUrl":"https://doi.org/10.1088/2631-8695/adc77e","url":null,"abstract":"DC voltage references are typically based on calibrated Zener Diodes which are subject to drift and therefore require periodic recalibration against a Primary Standard. Since it is preferable to maintain constant power to such references, the shipping and handling logistics involved in such a recalibration can present an unacceptable burden. Validation is therefore preferred, and typically accomplished by comparison against other local Zener Diodes. However, these Zener Diodes are all subject to correlated aging mechanisms. Voltage to frequency conversion represents an alternative mechanism for validation and accordingly, is not subject to aging highly correlated with the system being validated. Voltage to frequency conversion using a low space, weight, and power Voltage Controlled Oscillator offers a mechanism for identifying voltage reference drift by comparing the voltage-controlled frequency to primary frequency, typically available through GPS. This technique can validate voltage references when comparison against a primary voltage standard is impractical due to system deployment, away from a robust logistics chain. Voltage to frequency conversion may be accomplished by a Voltage Controlled Ovenized Crystal Oscillator. Using commercial-off-the-shelf hardware we constructed a test to evaluate the stability of such an oscillator for 258 days of continuous run-time, without age acceleration measures. Long-term drift was consistent with a <math> <msqrt><mrow><mi>t</mi></mrow> </msqrt> </math> aging model. Sequestering 2/3 of the data to construct an aging model, then comparing sequestered data, yielded a model-to-data difference of 35 ppm (35 μV/V) which may prove acceptable in supporting instruments in the 6.5-digit voltmeter class.","PeriodicalId":11753,"journal":{"name":"Engineering Research Express","volume":"7 2","pages":"025308"},"PeriodicalIF":1.5,"publicationDate":"2025-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11977046/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143989816","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Real time impact of voltage variation on variable frequency transformer during asynchronous power transfer 异步输电过程中电压变化对变频器的实时影响

Engineering Research Express Pub Date : 2025-05-28 DOI: 10.1088/2631-8695/adde12

Iqra Javid, Sami Jan Lolu, I. Nawaz, Farhad Ilahi Bakhsh

{"title":"Real time impact of voltage variation on variable frequency transformer during asynchronous power transfer","authors":"Iqra Javid, Sami Jan Lolu, I. Nawaz, Farhad Ilahi Bakhsh","doi":"10.1088/2631-8695/adde12","DOIUrl":"https://doi.org/10.1088/2631-8695/adde12","url":null,"abstract":"Abstract Nowadays, Variable Frequency Transformer (VFT) has gained significant interest for regulating power transfer between two asynchronous networks. VFT is a controllable, bidirectional transmission device which integrates the principles of both rotatory transformer and phase shifting transformer, in order to regulate the power flow between two power grids. The research studies indicate that, the operation of VFT has previously only been studied under constant voltage conditions. Keeping this gap in view, this paper provides a detailed analysis of power transfer through VFT operating under variable voltage conditions. The two asynchronous grids, one operating at a frequency of 60 Hz and the other one operating at 50 Hz, are connected to the stator and rotor of the VFT, respectively. The power flow is initially examined for constant voltage and variable torque conditions. The results demonstrate that the power flow between the two asynchronous grids varies linearly with the applied torque and reverses as the torque direction is reversed. The developed system was then modified to account for voltage variation. In order to analyse the impact of voltage variation on power flow through VFT, both the rotor and stator side of VFT are subjected to varying voltages. The results show that when the voltage on one side of the VFT is reduced, power flow towards that side increases while power flow towards the other side decreases. This indicates that the power flow through VFT can be effectively controlled by controlling both torque and the voltage on the rotor and stator side of VFT. Further, the simulation results achieved are validated through a real-time hardware in loop (HIL) implementation using Typhoon HIL emulator.","PeriodicalId":11753,"journal":{"name":"Engineering Research Express","volume":"7 2","pages":"025365-025365"},"PeriodicalIF":0.0,"publicationDate":"2025-05-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147920891","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 analysis of a reduced switch nine level inverter topology for grid integration of battery storage system 电池储能系统并网逆变器简化开关九电平拓扑设计与分析

Engineering Research Express Pub Date : 2025-05-07 DOI: 10.1088/2631-8695/add5c2

Sambit Bhanja Bhanja, Farhad Ilahi Bakhsh, Mohammad Tayyab, Adil Sarwar, Mohamed Bendaoud

{"title":"Design and analysis of a reduced switch nine level inverter topology for grid integration of battery storage system","authors":"Sambit Bhanja Bhanja, Farhad Ilahi Bakhsh, Mohammad Tayyab, Adil Sarwar, Mohamed Bendaoud","doi":"10.1088/2631-8695/add5c2","DOIUrl":"https://doi.org/10.1088/2631-8695/add5c2","url":null,"abstract":"Abstract This paper discusses about a single-phase reduced-switch nine-level inverter that is capable of generating a high-quality output voltage waveform with low harmonic distortion. The study includes the presented inverter design, control strategy, and its operation for grid integration of battery storage system. Level-shifted pulse width modulation technique is used to generate the switching signals for the proposed grid integrated battery storage system. The performance of the proposed topology is evaluated through MATLAB simulations and validated by real-time results using OPAL-RT simulator. The results indicate that it can meet the standard grid code requirements for low total harmonic distortion, high efficiency, and a good power factor. Overall, the proposed inverter offers an effective solution for high-quality power generation in grid connected battery storage system. The proposed grid connected battery storage system has the potential to be used in various applications, including renewable energy systems, electric vehicles, and industrial power conversion systems.","PeriodicalId":11753,"journal":{"name":"Engineering Research Express","volume":"7 2","pages":"025347-025347"},"PeriodicalIF":0.0,"publicationDate":"2025-05-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147891604","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: 1

A low-cost quantitative hydrogen concentration detection system 一种低成本的氢浓度定量检测系统

Engineering Research Express Pub Date : 2025-05-06 DOI: 10.1088/2631-8695/add4c7

Yixuan Hou, Zixuan Wang, Jiahao He, Xiaodong He, Yingbang Yao

{"title":"A low-cost quantitative hydrogen concentration detection system","authors":"Yixuan Hou, Zixuan Wang, Jiahao He, Xiaodong He, Yingbang Yao","doi":"10.1088/2631-8695/add4c7","DOIUrl":"https://doi.org/10.1088/2631-8695/add4c7","url":null,"abstract":"Abstract Metal oxide semiconductor (MOS) sensor arrays have traditionally been employed primarily for qualitative gas identification rather than for precise quantitative concentration detection. In this study, we present the development of an innovative and cost-effective hydrogen concentration detection system, which is priced at less than 15 USD. This system utilizes an array of 10 MOS sensors to accurately measure hydrogen concentrations. To enhance the performance of our detection system, we implemented Principal Component Analysis (PCA) for effective dimensionality reduction, followed by training a Deep Neural Network (DNN) to create a robust predictive model. The trained model was successfully deployed onto an embedded system using STM32 CubeMX.AI tools, facilitating real-time detection capabilities. Our comprehensive dataset, which includes voltage readings collected under varying temperature and humidity conditions, was instrumental in achieving an impressive accuracy rate of over 95% within a hydrogen concentration range of 100–300 ppm during rigorous testing. The results of our study underscore the feasibility and effectiveness of utilizing a MOS sensor array combined with advanced data processing techniques for quantitative concentration detection. This approach not only demonstrates high precision but also offers a promising solution for practical applications in hydrogen concentration monitoring.","PeriodicalId":11753,"journal":{"name":"Engineering Research Express","volume":"7 2","pages":"025342-025342"},"PeriodicalIF":0.0,"publicationDate":"2025-05-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147910881","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: 5

Modified adaptive fuzzy logic based real-time MPPT controller for fuel cell framework management under dynamic conditions 基于改进自适应模糊逻辑的燃料电池框架动态管理实时MPPT控制器

Engineering Research Express Pub Date : 2025-04-08 DOI: 10.1088/2631-8695/adca86

Mohammad Junaid Khan, Yogendra Narayan, PAWAN Pawan, Asyraf Afthanorhan, Farhad Ilahi Bakhsh

{"title":"Modified adaptive fuzzy logic based real-time MPPT controller for fuel cell framework management under dynamic conditions","authors":"Mohammad Junaid Khan, Yogendra Narayan, PAWAN Pawan, Asyraf Afthanorhan, Farhad Ilahi Bakhsh","doi":"10.1088/2631-8695/adca86","DOIUrl":"https://doi.org/10.1088/2631-8695/adca86","url":null,"abstract":"Abstract The response of a fuel cell (FC) depends on the water content of the membrane and cell temperature. These are the two main operational factors which affect the power production of an FC. Therefore, every time maximum power point (MPP) on the (Power—Current) curve of the FC is distinct. To enhance the power production of the FC, the maximum power point tracking (MPPT) technique is implemented. In this paper, a Modified Adaptive Fuzzy Logic (MAFL) based MPPT technique has been used for the FC framework. For this, FC module is connected to the boost converter in which proposed MPPT technique is implemented in MATLAB/Simulink and validated using real-time OPAL-RT based hardware setup. In order to prove the efficacy of the proposed MPPT controller i.e. combination of modified Fuzzy Logic Controller (FLC) and adaptive Perturb and Observe (P&O) controller. From the comparisons, it is found that the proposed MAFL based MPPT controller provides the best and smoothest results. It also reduces the steady-state power fluctuations and boosts transient response as compared to other specified MPPT controllers.","PeriodicalId":11753,"journal":{"name":"Engineering Research Express","volume":"7 2","pages":"025317-025317"},"PeriodicalIF":0.0,"publicationDate":"2025-04-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147887455","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

Optimization of friction stir processing parameters to produce AA2014/SiC surface composites using response surface methodology 响应面法优化AA2014/SiC表面复合材料搅拌摩擦工艺参数

Engineering Research Express Pub Date : 2025-04-04 DOI: 10.1088/2631-8695/adc973

Shalok Bharti, Varun Dutta, Nilesh D. Ghetiya

{"title":"Optimization of friction stir processing parameters to produce AA2014/SiC surface composites using response surface methodology","authors":"Shalok Bharti, Varun Dutta, Nilesh D. Ghetiya","doi":"10.1088/2631-8695/adc973","DOIUrl":"https://doi.org/10.1088/2631-8695/adc973","url":null,"abstract":"Abstract In this study, Friction Stir Processing (FSP) was applied to produce surface composites of AA2014 by using SiC as a reinforcement. The main aim of the investigation is to study the influence of FSP on the microhardness of AA2014/SiC surface composites. A mathematical model was created by employing the Response Surface Methodology (RSM) to predict the microhardness properties by optimizing FSP parameters like tool rotating speed, tool tilt angle, tool traverse speed, and the number of FSP passes. It was observed that the tool traverse speed of 50 mm min −1 , 1000 rpm tool rotating speed, and tool tilt angle of 1° with 2 FSP passes produce surface composites with uniformly dispersed SiC particles. The grain size of the produced surface composites decreased from 26.9 μm in the base matrix to 16.7 μm in the FSPed specimens, enhancing microhardness by 6.25% in the cross-section and 15.36% in the top surface of the FSPed specimens. The dynamic recrystallization and generation of fine-grain microstructure played an essential role in enhancing the microhardness of the material. These results show the effectiveness of the RSM technique in optimizing the FSP parameters and producing the AA2014/SiC for enhanced microhardness applications in aerospace and automobile applications.","PeriodicalId":11753,"journal":{"name":"Engineering Research Express","volume":"7 2","pages":"025404-025404"},"PeriodicalIF":0.0,"publicationDate":"2025-04-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147887630","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: 3

Pulse width modulation for adjusting laser power in measuring upconversion excitation threshold 测量上转换激发阈值时调节激光功率的脉宽调制

Engineering Research Express Pub Date : 2025-03-24 DOI: 10.1088/2631-8695/adc4bd

Zeyu Zhang, R. Mo, Zece Zhu

引用次数: 0