Open Engineering最新文献_第10页

Impact of the COVID-19 pandemic on road traffic accident forecasting in Poland and Slovakia COVID-19大流行对波兰和斯洛伐克道路交通事故预测的影响

IF 1.7

Open Engineering Pub Date : 2022-01-01 DOI: 10.1515/eng-2022-0370

M. Jurković, Piotr Gorzelańczyk, T. Kalina, J. Jaroš, M. Mohanty

{"title":"Impact of the COVID-19 pandemic on road traffic accident forecasting in Poland and Slovakia","authors":"M. Jurković, Piotr Gorzelańczyk, T. Kalina, J. Jaroš, M. Mohanty","doi":"10.1515/eng-2022-0370","DOIUrl":"https://doi.org/10.1515/eng-2022-0370","url":null,"abstract":"Abstract The COVID-19 pandemic significantly affected the performance of the transport sector and its overall intensity. Reducing mobility has a major impact on road traffic accidents. The aim of this study is to forecast the number of road traffic accidents in Poland and Slovakia and to assess how the COVID-19 pandemic affected its trend. For this purpose, data for Poland and Slovakia in the selected relevant period were analyzed. Based on actual data from the past, a forecast was made for the future considering two scenarios – one where there is no effect of pandemic, and another with effect of pandemic. Forecasting the number of accidents in Poland was carried out using selected time series models related to linear trend (Holt and Winters method) and the exponential model. In the case of Slovakia, the model without trend and the exponential model were used to forecast the number of traffic accidents. The results of the research show that the pandemic caused a decrease in the number of traffic accidents in Poland by 31% and in Slovakia by 33%. This is a significant decline, but it is linearly dependent on restrictive measures that affect the mobility of the population. A similar trend can therefore be expected on a European scale.","PeriodicalId":19512,"journal":{"name":"Open Engineering","volume":"12 1","pages":"578 - 589"},"PeriodicalIF":1.7,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47572739","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: 6

An environmentally friendly hydrometallurgy process for the recovery and reuse of metals from spent lithium-ion batteries, using organic acid 使用有机酸回收和再利用废旧锂离子电池中金属的环保湿法冶金工艺

IF 1.7

Open Engineering Pub Date : 2022-01-01 DOI: 10.1515/eng-2022-0050

A. Jumari, C. Yudha, M. Nizam, E. Dyartanti, Suranto, A. Purwanto

{"title":"An environmentally friendly hydrometallurgy process for the recovery and reuse of metals from spent lithium-ion batteries, using organic acid","authors":"A. Jumari, C. Yudha, M. Nizam, E. Dyartanti, Suranto, A. Purwanto","doi":"10.1515/eng-2022-0050","DOIUrl":"https://doi.org/10.1515/eng-2022-0050","url":null,"abstract":"Abstract The increasing use of lithium-ion batteries (LIBs) presents a serious environmental problem. These spent LIBs are suitable sources of metals for the production of LIB cathode active material. This study successfully recovered nickel, cobalt, and aluminum from spent LIB nickel cobalt aluminum oxide (NCA) and regenerated NCA cathode. The effect of the spent anode as a reducing agent was also investigated. The spent anode alone did not reduce the metals Ni and Co sufficiently. The leaching efficiency was only 34.8, 47.15, and 86.75% for Ni, Co, and Al, respectively, and these values did not increase with increasing citric acid concentration or the addition of ascorbic acid as a reducing agent. However, it increased significantly to 85, 90.12, and 100%, for Ni, Co, and Al, respectively, with the addition of 2% v/v H2O2. The ternary metal oxalate (TMO) precipitation of the leaching solution confirmed the synthesis of TMO from the precursor. The regenerated NCA synthesized from TMO had better electrochemical performances than those of new commercial NCA. It had a specific discharge capacity of 137 mA h/g and a retention capacity of 85.4% at 2 C after 50 cycles, whereas the new commercial had a specific discharge capacity of 133.4 mA h/g and a retention capacity of 82.6% at 1 C after 50 cycles.","PeriodicalId":19512,"journal":{"name":"Open Engineering","volume":"12 1","pages":"485 - 494"},"PeriodicalIF":1.7,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47779677","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: 2

Design and development of the application monitoring the use of server resources for server maintenance 服务器维护服务器资源使用监控应用程序的设计和开发

IF 1.7

Open Engineering Pub Date : 2022-01-01 DOI: 10.1515/eng-2022-0055

F. Gaol, S. Santoso, T. Matsuo

引用次数: 0

An empirical formula development to predict suspended sediment load for Khour Al-Zubair port, South of Iraq 伊拉克南部Khour Al Zubair港悬沙量预测经验公式的发展

IF 1.7

Open Engineering Pub Date : 2022-01-01 DOI: 10.1515/eng-2022-0021

Ahmed A. Dakheel, A. Al-Aboodi, Sarmad Abbas

{"title":"An empirical formula development to predict suspended sediment load for Khour Al-Zubair port, South of Iraq","authors":"Ahmed A. Dakheel, A. Al-Aboodi, Sarmad Abbas","doi":"10.1515/eng-2022-0021","DOIUrl":"https://doi.org/10.1515/eng-2022-0021","url":null,"abstract":"Abstract A new formula for determining the suspended sediment load in Khour Al-Zubair port has been proposed using dimensional analysis. Six cross-sections have been identified in Khour Al-Zubair port at Basrah province, South of Iraq for the purpose of conducting field measurements during the two tidal periods (Neap and Spring). The study involved taking field measurements of the hydraulic and fluid properties, and sediment sampling by section every 2 h to get effective parameters used for developing empirical formula. These parameters include the density of sediment (ρ s), mean velocity (V), hydraulic radius (R h), fall velocity of the particle (W s), median grain size (d 50), the salinity of water (S), water level (W L), the width of the estuary (B), specific gravity (G s), maximum flow depth (D max), and kinematics viscosity (ν). The formula was developed using the statistical analysis using the SPSS program and dimensional analysis method. A good agreement between the loads computed by the suggested formula and the observed data has been attained based on the correlation coefficient value (R = 0.97). The results showed that the average total suspended sediment loads by using the proposed formula is 1288285.464 tons/year.","PeriodicalId":19512,"journal":{"name":"Open Engineering","volume":"12 1","pages":"169 - 175"},"PeriodicalIF":1.7,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49530065","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: 2

Water hammer phenomenon in pumping stations: A stability investigation based on root locus 泵站水锤现象：基于根轨迹的稳定性研究

IF 1.7

Open Engineering Pub Date : 2022-01-01 DOI: 10.1515/eng-2022-0029

Rasha Hayder Al-Khayat, Ali Wadi Al-Fatlawi, M. Al-Baghdadi, M. Al-Waily

引用次数: 5

COVID-19 lockdown impact on CERN seismic station ambient noise levels COVID-19封锁对欧洲核子研究中心地震站环境噪声水平的影响

IF 1.7

Open Engineering Pub Date : 2022-01-01 DOI: 10.1515/eng-2022-0005

Ł. Ścisło, Ł. Łacny, M. Guinchard

引用次数: 2

Performance of the anaerobic baffled reactor for primary treatment of rural domestic wastewater in Iraq 厌氧折流板反应器在伊拉克农村生活污水一级处理中的性能

IF 1.7

Open Engineering Pub Date : 2022-01-01 DOI: 10.1515/eng-2022-0346

Fatimah K. Mahdi, S. Abu-Alhail, A. Dawood

引用次数: 0

Production of nickel-rich LiNi0.89Co0.08Al0.03O2 cathode material for high capacity NCA/graphite secondary battery fabrication 制备高容量NCA/石墨二次电池用富镍lini0.89 co0.08 al0.030 o2正极材料

IF 1.7

Open Engineering Pub Date : 2022-01-01 DOI: 10.1515/eng-2022-0051

C. Yudha, A. P. Hutama, M. Rahmawati, M. Arinawati, H. Aliwarga, H. Widiyandari, A. Purwanto

{"title":"Production of nickel-rich LiNi0.89Co0.08Al0.03O2 cathode material for high capacity NCA/graphite secondary battery fabrication","authors":"C. Yudha, A. P. Hutama, M. Rahmawati, M. Arinawati, H. Aliwarga, H. Widiyandari, A. Purwanto","doi":"10.1515/eng-2022-0051","DOIUrl":"https://doi.org/10.1515/eng-2022-0051","url":null,"abstract":"Abstract Li-ion secondary battery is highly recommended as a power source to highly advanced battery electric vehicles. Among various types, the lithium nickel cobalt aluminum oxide (NCA) battery is considered suitable for high energy and power application. In this study, the NCA cathode material LiNi0.89Co0.08Al0.03O2 was produced via the oxalate co-precipitation technique to reduce the overall production cost and process complexity. Oxalic acid and a small amount of sodium hydroxide were used as the precipitant and pH regulator, respectively. Homogenous and loose metal oxalate precipitate formation was confirmed by X-ray diffraction (XRD), scanning electron microscopy, and Fourier-transform infrared spectroscopy analysis. XRD patterns of the as-obtained micron-sized NCA showed a well-layered hexagonal structure. The electrochemical properties of the cathode in the full cell were thoroughly examined. The specific discharge capacity of the as-obtained NCA in NCA/LiPF6/graphite at a current rate of 20 mA/g was 142 mAh/g. The as-prepared NCA sample had capacity retention of 80% after being charged and discharged at 0.1 A/g for 101 cycles. Scaling up of NCA production process to 2 kg per batch was conducted and evaluation of NCA product quality was performed by material characterization. Based on the overall results and considering the overall process, such an approach is expected to be developed and improved for future large-scale production purposes.","PeriodicalId":19512,"journal":{"name":"Open Engineering","volume":"12 1","pages":"501 - 510"},"PeriodicalIF":1.7,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46854177","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: 2

Solving transportation externalities, economic approaches, and their risks 解决运输外部性、经济方法及其风险

IF 1.7

Open Engineering Pub Date : 2022-01-01 DOI: 10.1515/eng-2022-0001

Z. Ríha, Iveta Dočkalíková, J. Tichý, Daniel Koštiaľ

{"title":"Solving transportation externalities, economic approaches, and their risks","authors":"Z. Ríha, Iveta Dočkalíková, J. Tichý, Daniel Koštiaľ","doi":"10.1515/eng-2022-0001","DOIUrl":"https://doi.org/10.1515/eng-2022-0001","url":null,"abstract":"Abstract The impact of human activity on the environment is an ongoing concern not only in the natural sciences but also in economics. Special attention is focused on the transport system, which is one of the largest producers of so-called externalities. However, its regulation may mean a serious disruption of global logistics links, which are crucial for maintaining international and national trade, gross domestic product formation and, therefore, to maintain the economic level to which mankind is accustomed to and which brings a quality of human life that is the highest in the human history. The article, therefore, examines possible economic approaches and theories to the problem of the relationship between human activity and the environment and the possible reduction of negative externalities. Typical approaches to dealing with externalities include the theories of the English economist Arthur Pigou, who proposed the application of various taxes and subsidies to limit the so-called social costs, whereas the extreme solution is the explicit prohibition of certain activities. In contrast to this approach is the theory known as the environmental Kuznets curve, which states the relationship between environmental damage and the economic performance of a given geographical area. It must be respected that the reduction of negative externalities, or their so-called internalisation, cannot be expected to be a trivial solution. The application of additional taxes or subsidies can lead to many unintended consequences, which may ultimately have a greater negative economic impact than the externalities themselves. Therefore, the conclusion of this article is devoted to a discussion of the potential risks of such regulatory interventions from the government position.","PeriodicalId":19512,"journal":{"name":"Open Engineering","volume":"12 1","pages":"1 - 10"},"PeriodicalIF":1.7,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49354867","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

Performance of a horizontal well in a bounded anisotropic reservoir: Part I: Mathematical analysis 有界各向异性油藏中水平井的性能：第一部分：数学分析

IF 1.7

Open Engineering Pub Date : 2022-01-01 DOI: 10.1515/eng-2022-0003

T. K. Nzomo, S. Adewole, K. Awuor, Daniel Okang’a Oyoo

{"title":"Performance of a horizontal well in a bounded anisotropic reservoir: Part I: Mathematical analysis","authors":"T. K. Nzomo, S. Adewole, K. Awuor, Daniel Okang’a Oyoo","doi":"10.1515/eng-2022-0003","DOIUrl":"https://doi.org/10.1515/eng-2022-0003","url":null,"abstract":"Abstract To enhance the productivity of horizontal wells, it is of necessity to ensure that they perform optimally. This requires an understanding of how the reservoir’s geometry, anisotropy and well design affect the pressure response. Mathematical formulations can be used to simulate pressure response in the wellbore and the data obtained can be analysed to obtain well and reservoir parameters that can aid performance and evaluation. In this study, a mathematical model that can be used to approximate pressure response in a horizontal well is formulated, and a detailed mathematical analysis that can be used to obtain well and reservoir parameters are provided. A horizontal well inside a rectangular drainage volume with sealed boundaries is considered and the effect of each boundary on pressure throughout its productive life is studied. In the analysis, investigations on how the reservoir parameters can be approximated over a given period of production are conducted. This is achieved by identification of the appropriate source and Green’s functions. These source functions allow us to formulate a mathematical model for dimensionless pressure. Considering the diagnostic plots for both dimensionless pressure and dimensionless pressure derivative, mathematical analysis studies the possible behaviour of the plots. Analysis indicates that the reservoir anisotropy can be approximated during the infinite-acting flow at early times when other parameters are known. Further, when the first boundary is felt, in this case the vertical boundary, the horizontal permeability can be approximated during the transition flow periods at middle times. Finally, at late times when all the boundaries have been felt and a pseudosteady state flow is evident, reservoir dimensions can be approximated. These results can significantly improve well test analysis and enhance the performance evaluation of a horizontal well.","PeriodicalId":19512,"journal":{"name":"Open Engineering","volume":"12 1","pages":"17 - 28"},"PeriodicalIF":1.7,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49383511","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