Comput. Chem. Eng.最新文献_第4页

Comparative Analysis of Indoor Localization across Various Wireless Technologies 不同无线技术的室内定位比较分析

Comput. Chem. Eng. Pub Date : 2023-09-08 DOI: 10.3390/eng4030131

Amanpreet Singh, Matin Emam, Yaser Al Mtawa

{"title":"Comparative Analysis of Indoor Localization across Various Wireless Technologies","authors":"Amanpreet Singh, Matin Emam, Yaser Al Mtawa","doi":"10.3390/eng4030131","DOIUrl":"https://doi.org/10.3390/eng4030131","url":null,"abstract":"This article examines the comparative effectiveness of three indoor node localization techniques—Multilateration, the Weighted Centroid algorithm, and Grid-based Received Signal Strength (RSS)—in wireless networking applications. The comparison is based on their performance against localization accuracy using RSS Indicator (RSSI) data in three experiments. The experiments utilized internally generated or real-world datasets with RSSI values for the unknown tag nodes. The datasets were obtained from various sources and evaluated in different scenarios to determine the efficiency of the three localization techniques. The results were evaluated and compared using mean error and standard deviation metrics. The findings indicate that trilateration achieves superior localization accuracy and precision in a Bluetooth Low Energy (BLE) environment compared to Wi-Fi and ZigBee. The Centroid technique showed the highest resistance to noise and outliers but is positioned biased (unlike Trilateration). Besides that, the Grid-based RSS technique is highly sensitive to noise, and theoretical RSS. These findings can greatly assist researchers and network operators in carefully selecting the most suitable localization technique for their wireless networking applications, taking into account the specific wireless technology utilized and their unique needs and limitations.","PeriodicalId":10630,"journal":{"name":"Comput. Chem. Eng.","volume":"32 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-09-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80153133","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

Commercial Level Analysis of P2P vs. Net-Metering Comparing Economic and Technical Indexes P2P与净计量的商业层面分析比较经济技术指标

Comput. Chem. Eng. Pub Date : 2023-09-01 DOI: 10.3390/eng4030129

Esteban A. Soto, Alexander Vizcarrondo Ortega, Andrea Hernandez, L. Bosman

{"title":"Commercial Level Analysis of P2P vs. Net-Metering Comparing Economic and Technical Indexes","authors":"Esteban A. Soto, Alexander Vizcarrondo Ortega, Andrea Hernandez, L. Bosman","doi":"10.3390/eng4030129","DOIUrl":"https://doi.org/10.3390/eng4030129","url":null,"abstract":"As photovoltaics (PV), also known as solar electricity, has been growing over the years, the energy markets have been gradually moving toward decentralization. However, recent media accusations suggest that decentralized renewable energy is slowly becoming unpopular because of the hidden fees being charged to owners of installed PV systems. In response, this paper investigates the potential for alternative approaches to incentivize owners using peer-to-peer (P2P) sharing. This study provides an analytical comparison between the use of the P2P mechanism, the net-metering mechanism, and a combination of these in the commercial sector. Through the use of a simulation, this case study presents the possible outcomes of the implementation of these models in a microgrid. Using technical and economic indexes the comparison was made by looking at the following indexes: peak power, energy balance, economic benefit, and transaction index. Based on a microgrid of 28 commercial buildings, readings of consumption were taken at intervals of one hour, and a Python model was made to find PV size and compare trading mechanisms. It was found that the combination of P2P and net-metering had the best overall performance, followed by net-metering itself, with the best season being all for both, and summer for net-metering by itself. This shows that a P2P model implemented in a microgrid helps create more energy balance, although the combination would achieve the highest performance. This study can be used by policymakers for proposing renewable energy policies and regulations that are more beneficial to all prosumers and consumers.","PeriodicalId":10630,"journal":{"name":"Comput. Chem. Eng.","volume":"7 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73539700","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

Performance Analysis of Electric Vehicles with a Fuel Cell–Supercapacitor Hybrid System 燃料电池-超级电容器混合动力汽车性能分析

Comput. Chem. Eng. Pub Date : 2023-09-01 DOI: 10.3390/eng4030130

C. Armenta-Déu, Alejandro Arenas

{"title":"Performance Analysis of Electric Vehicles with a Fuel Cell–Supercapacitor Hybrid System","authors":"C. Armenta-Déu, Alejandro Arenas","doi":"10.3390/eng4030130","DOIUrl":"https://doi.org/10.3390/eng4030130","url":null,"abstract":"This paper presents a new methodology to evaluate the performance of an electric vehicle hybrid power system consisting of a fuel cell and a supercapacitor. The study compares the results to those obtained for a battery electric vehicle. The methodology extends to three driving modes, ECO, NORMAL, and SPORT, corresponding to conservative, moderate, and aggressive acceleration, and three driving conditions, low, medium, and high energy demand. We develop a simulation process to evaluate the energy consumption and the energy rate of a specific electric vehicle used as a prototype for the study. The methodology applies to a driving route that includes acceleration, deceleration, braking, and constant speed segments, reproducing standard driving conditions in urban journeys. The proposed method considers combined driving modes, ECO, NORMAL, and SPORT, in each acceleration process, with variable fractions, from 0% to 100%, for each mode. This methodology optimizes the simulation results for the current driving patterns in urban environments. The simulation results show an average reduction in energy consumption of 37% and 27.1% in vehicle weight, contributing to lower energy use. The study concludes that using a hybrid power system, a fuel cell/supercapacitor, instead of a battery in electric vehicles is beneficial, especially in journeys with frequent acceleration processes.","PeriodicalId":10630,"journal":{"name":"Comput. Chem. Eng.","volume":"7 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75620950","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

A Parametric Study on the LDB Strength of Steel-Concrete Composite Beams 钢-混凝土组合梁LDB强度的参数化研究

Comput. Chem. Eng. Pub Date : 2023-08-27 DOI: 10.3390/eng4030128

A. Rossi, Adriano Silva de Carvalho, Vinicius Moura de Oliveira, Alex Sander Clemente De Souza, C. H. Martins

{"title":"A Parametric Study on the LDB Strength of Steel-Concrete Composite Beams","authors":"A. Rossi, Adriano Silva de Carvalho, Vinicius Moura de Oliveira, Alex Sander Clemente De Souza, C. H. Martins","doi":"10.3390/eng4030128","DOIUrl":"https://doi.org/10.3390/eng4030128","url":null,"abstract":"Lateral distortional buckling (LDB) is an instability phenomenon characteristic of steel-concrete composite beams (SCCB) that occurs in the presence of hogging moments in regions close to internal supports. The LDB behavior in SCCB is not yet fully understood. The procedures for determining the LDB strength are based on the classic lateral torsional buckling theory or on the inverted U-frame model. In addition, the standard procedures make use of the classic design curves of the SSRC (Structural Stability Research Council) and ECCS (European Convention for Constructional Steelwork) developed to analyze the stability behavior of steel elements. However, studies indicate that the use of the same empirical curves obtained for the analysis of steel elements leads to the conservative results of the LDB strength in SCCB. Therefore, this article aims to assess the LDB strength in SCCB through the development of post-buckling numerical analysis using the ABAQUS software. In the parametric study, four types of steel with different mechanical properties were analyzed. In addition, the I-section, the unrestrained length, and the reinforcement rate in the concrete slab were varied. The results showed the influence of the steel type on the LDB strength and deviations from the standard procedures. A small influence of the longitudinal reinforcement area variation was verified in the LDB strength in the FE analyses; however, this factor is significantly important in the standard procedures, causing considerable divergences. These results can provide a reference for future research and specification reviews.","PeriodicalId":10630,"journal":{"name":"Comput. Chem. Eng.","volume":"30 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-08-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83349934","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

Decentralized Biogas Production in Urban Areas: Studying the Feasibility of Using High-Efficiency Engines 城市地区分散式沼气生产:研究使用高效发动机的可行性

Comput. Chem. Eng. Pub Date : 2023-08-24 DOI: 10.3390/eng4030127

R. González, J. García-Cascallana, Javier Gutiérrez-Bravo, X. Gómez

{"title":"Decentralized Biogas Production in Urban Areas: Studying the Feasibility of Using High-Efficiency Engines","authors":"R. González, J. García-Cascallana, Javier Gutiérrez-Bravo, X. Gómez","doi":"10.3390/eng4030127","DOIUrl":"https://doi.org/10.3390/eng4030127","url":null,"abstract":"The study examines decentralized waste treatment in an urban setting with a high-density population of 2500 inhab./km2. The co-digestion of food and garden waste was assumed by using several mid-size digesters, while centralized biogas and digestate valorization was considered. The studied configuration generates electricity and thermal energy, covering 1.3% of the residential electricity demand and 3.2% of thermal demand. The use of double-turbocharged engines under the most favorable scenario aids cities in reaching sustainability goals. However, the location of treatment plants is a factor that may raise social discomfort and cause a nuisance to citizens. Locating waste plants near residential areas causes discomfort due to possible odors, gaseous emissions, and housing market distortions. Such problematic aspects must be addressed for the decentralized alternative to work. These factors are of great relevance and must be given a practical solution if the circular economic model is to be implemented by considering the insertion of waste streams into the production system and generating local energy sources and raw materials.","PeriodicalId":10630,"journal":{"name":"Comput. Chem. Eng.","volume":"50 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-08-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82290725","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

Assessment of Techniques for Detection of Transient Radio-Frequency Interference (RFI) Signals: A Case Study of a Transient in Radar Test Data 瞬态射频干扰(RFI)信号检测技术的评估:以雷达测试数据中的瞬态为例

Comput. Chem. Eng. Pub Date : 2023-08-21 DOI: 10.3390/eng4030126

S. Durden, V. Vilnrotter, S. Shaffer

{"title":"Assessment of Techniques for Detection of Transient Radio-Frequency Interference (RFI) Signals: A Case Study of a Transient in Radar Test Data","authors":"S. Durden, V. Vilnrotter, S. Shaffer","doi":"10.3390/eng4030126","DOIUrl":"https://doi.org/10.3390/eng4030126","url":null,"abstract":"The authors present a case study of the investigation of a transient signal that appeared in the testing of a radar receiver. The characteristics of the test conditions and data are first discussed. The authors then proceed to outline the methods for detecting and analyzing transients in the data. For this, they consider several methods based on modern signal processing and evaluate their utility. The initial method used for identifying transients is based on computer vision techniques, specifically, thresholding spectrograms into binary images, morphological processing, and object boundary extraction. The authors also consider deep learning methods and methods related to optimal statistical detection. For the latter approach, since the transient in this case was chirp-like, the method of maximum likelihood is used to estimate its parameters. Each approach is evaluated, followed by a discussion of how the results could be extended to analysis and detection of other types of transient radio-frequency interference (RFI). The authors find that computer vision, deep learning, and statistical detection methods are all useful. However, each is best used at different stages of the investigation when a transient appears in data. Computer vision is particularly useful when little is known about the transient, while traditional statistically optimal detection can be quite accurate once the structure of the transient is known and its parameters estimated.","PeriodicalId":10630,"journal":{"name":"Comput. Chem. Eng.","volume":"190 ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-08-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91466545","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

Energy Efficiency Assessment for Buildings Based on the Generative Adversarial Network Structure 基于生成对抗网络结构的建筑能效评价

Comput. Chem. Eng. Pub Date : 2023-08-18 DOI: 10.3390/eng4030125

Ivana Walter, Marko Tanaskovic, Miloš Stanković

引用次数: 0

Cold Plasma Technology for Tomato Processing By-Product Valorization: The Case of Tomato Peeling and Peel Drying 冷等离子体技术在番茄加工副产物增值中的应用——以番茄去皮和果皮干燥为例

Comput. Chem. Eng. Pub Date : 2023-08-15 DOI: 10.3390/eng4030124

M. Sosnin, Egor Berestenko, E. H. A. Mounassar, I. Shorstkii

引用次数: 1

Performance of Thermal-, Acid-, and Mechanochemical-Activated Montmorillonite for Environmental Protection from Radionuclides U(VI) and Sr(II) 热、酸和机械化学活化蒙脱土对放射性核素U(VI)和Sr(II)的环境保护性能

Comput. Chem. Eng. Pub Date : 2023-08-11 DOI: 10.3390/eng4030122

I. Kovalchuk

{"title":"Performance of Thermal-, Acid-, and Mechanochemical-Activated Montmorillonite for Environmental Protection from Radionuclides U(VI) and Sr(II)","authors":"I. Kovalchuk","doi":"10.3390/eng4030122","DOIUrl":"https://doi.org/10.3390/eng4030122","url":null,"abstract":"Low-cost sorption materials based on the clay mineral of the smectite group—montmorillonite—were used for the removal of radionuclides uranium (VI) and strontium (II) from contaminated water. A wide range of industrial methods such as thermal treatment, acid activation, and mechanochemical activation were applied. Complex methods, such as SEM microscopy analysis, X-ray powder diffraction (XRD), thermal analysis, and nitrogen adsorption–desorption at −196 °C, were used to assess the characteristics of the structure of the obtained materials. The thermal treatment, acid activation, and mechanochemical activation resulted in changes in the surface properties of the clay minerals: specific surface area, porosity, and distribution of active sites. It was established that the mechanochemical activation of montmorillonite significantly increases the sorption characteristics of the material for U(VI) and Sr(II) and the acid activation of montmorillonite increases it for U(VI). The appropriateness of the experimental adsorption values for U(VI) and Sr(II) on modified montmorillonite to Langmuir and Freundlich models was found. Independently of the changes induced by acid attack, calcinations, or milling, the sorption of U(VI) and Sr(II) ions on treated montmorillonite occurs on a homogeneous surface through monolayer adsorption in a similar fashion to natural montmorillonite. Water purification technologies and modern environmental protection technologies may successfully use the obtained clay-based sorbents.","PeriodicalId":10630,"journal":{"name":"Comput. Chem. Eng.","volume":"22 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-08-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72900234","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

Comparison between Mullite-Based and Anorthite-Based Porcelain Tiles: A Review 莫来石基与钙长石基瓷砖的比较研究综述

Comput. Chem. Eng. Pub Date : 2023-08-11 DOI: 10.3390/eng4030123

Kun Li, Eloise de Sousa Cordeiro, A. De Noni

引用次数: 0