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Assessment of the Energy Efficiency of Three-Phase Induction Motors Powered by A Photovoltaic System 光伏系统驱动的三相感应电机能效评估
Q1 Economics, Econometrics and Finance Pub Date : 2024-05-08 DOI: 10.32479/ijeep.15838
Narciso Castro Charris, Vladimir Sousa Santos, J. J. C. Eras, Jorge M. Mendoza Fandiño
This study aims to determine the energy efficiency of three-phase induction motors (TIM) powered when operated with photovoltaic systems (PVS). The environmental advantages of photovoltaic systems (PVS) are very well known. However, there are still challenges related to energy quality, electricity generation instability, failure in frequency regulation, instability in reactive power, and harmonics generation. However, the impact of PVS on TIM efficiency has not been thoroughly explored. This research compares a TIM's electromechanical characteristics and efficiency when powered by a conventional electrical grid versus a PVS. Experimental studies revealed that when powered by the PVS, the TIM experienced increased voltage and higher voltage and current harmonics compared to grid power. These electrical difficulties, attributed to the PVS inverter, resulted in a 2.7% decrease in TIM efficiency compared to grid power. Modeling conducted under actual load variation conditions demonstrated a 2.6% increase in energy consumption when powered by the PVS compared to grid power. Based on these findings, PVS installers are advised to consider the energy quality provided by these systems, as it may affect the efficient operation of TIM, leading to increased energy consumption.
本研究旨在确定使用光伏系统(PVS)供电的三相感应电动机(TIM)的能效。光伏系统(PVS)的环保优势众所周知。然而,在能源质量、发电不稳定性、频率调节故障、无功功率不稳定性和谐波产生等方面仍存在挑战。然而,光伏系统对 TIM 效率的影响尚未得到深入探讨。本研究比较了由传统电网和光伏系统供电时 TIM 的机电特性和效率。实验研究表明,与电网供电相比,光伏系统供电时,TIM 的电压升高,电压和电流谐波增大。由于 PVS 逆变器造成的这些电气困难,导致 TIM 效率比电网功率降低了 2.7%。在实际负载变化条件下进行的建模显示,与电网供电相比,由 PVS 供电时的能耗增加了 2.6%。基于这些发现,建议光伏系统安装人员考虑这些系统提供的能源质量,因为它可能会影响 TIM 的高效运行,导致能耗增加。
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引用次数: 0
The Long-Run Linkage among the Macroeconomic Factors and CO2 Emissions in terms of Sea Transport Induced EKC Hypothesis in USA 从美国海运诱发的 EKC 假设看宏观经济因素与二氧化碳排放之间的长期联系
Q1 Economics, Econometrics and Finance Pub Date : 2024-05-08 DOI: 10.32479/ijeep.15734
Ayşe Özge Artekin
The main aim of this article is to comprehend the long-run relationship among sea transportation, energy use, GDP, and CO2 for USA from 1980 to 2023. In this sense, FMOLS, DOLS, CCR, and ARDL analyses are employed in order to investigate the entity of long-run linkage between the relevant variables. According to results of this manuscript, except energy use there is no both long-run relationship among variables and effects of independent variables (GDP, sea transportation) on dependent variable (CO2 emissions) from 1980 to 2023 in USA. Therefore, the sea transport-induced EKC hypothesis has not been confirmed empirically. Although the hypothesis has not been confirmed, there are some issues to consider in terms of energy consumption. Transportation energy consumption and greenhouse gas emissions are seen as an alarming threat to leaving a livable and sustainable green environment and economy to future generations. Fossil fuels used in transportation have an important place in carbon dioxide emissions. This is seen as a crucial environmental factor that all stakeholders should consider when planning energy and environmental policy decisions. In order to prevent environmental quality from being negatively affected by greenhouse gas and exhaust emissions, policy makers need to encourage more energy efficient and healthier transportation ways. Thus, the harmful effects of transportation energy consumption can be reduced as well.
本文的主要目的是理解 1980 年至 2023 年美国海运、能源使用、GDP 和二氧化碳之间的长期关系。为此,本文采用了 FMOLS、DOLS、CCR 和 ARDL 分析方法来研究相关变量之间的长期联系。分析结果表明,从 1980 年到 2023 年,美国除能源使用外,其他变量之间不存在长期关系,自变量(GDP、海上运输)对因变量(二氧化碳排放)也不存在影响。因此,海洋运输引发的 EKC 假设并未得到经验证实。虽然假设没有得到证实,但在能源消耗方面有一些问题值得考虑。运输能源消耗和温室气体排放被认为是给子孙后代留下宜居和可持续发展的绿色环境和经济的一个令人担忧的威胁。运输中使用的化石燃料在二氧化碳排放中占有重要地位。这被视为一个重要的环境因素,所有利益相关者在规划能源和环境政策决策时都应加以考虑。为了防止环境质量受到温室气体和废气排放的负面影响,政策制定者需要鼓励更节能、更健康的交通方式。这样,交通能源消耗的有害影响也可以减少。
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引用次数: 0
Examining the Role of Women’s Labor Participation in CO2 Emissions in Saudi Arabia 研究沙特阿拉伯妇女参与劳动在二氧化碳排放中的作用
Q1 Economics, Econometrics and Finance Pub Date : 2024-05-08 DOI: 10.32479/ijeep.15740
Haider Mahmood, Muhammad Tanveer
Women can play an active role in determining environmental quality, and Saudi women’s share in the labor market is increasing considerably. Women's participation is still low in the labor market, and their participation might affect the aggregated environmental situation. Therefore, we explore the effect of Women's Labor Participation (WLP) on CO2 emissions in Saudi Arabia from 1990 to 2022 by employing a cointegration technique. The Environmental Kuznets Curve (EKC) is tested and substantiated in the long run, but it is not verified in the short run. WLP raises CO2 emissions. Thus, women's labor market entry has environmental consequences. Moreover, trade openness also contributes to CO2 emissions over a long period of time. Nevertheless, its short-term impact is environmentally pleasant. The study recommends checking environmental problems out of WLP by developing gender-responsive environmental policies. So, gender equality and sustainable growth would be targeted simultaneously.
妇女可以在决定环境质量方面发挥积极作用,沙特妇女在劳动力市场中所占的份额正在大幅增加。妇女在劳动力市场中的参与度仍然很低,她们的参与可能会影响整体环境状况。因此,我们采用协整技术探讨了 1990 年至 2022 年期间女性劳动力参与(WLP)对沙特阿拉伯二氧化碳排放的影响。环境库兹涅茨曲线(EKC)在长期得到了检验和证实,但在短期并未得到验证。WLP 增加了二氧化碳排放量。因此,妇女进入劳动力市场会对环境产生影响。此外,贸易开放也会长期增加二氧化碳排放量。不过,其短期影响对环境是有利的。研究建议,通过制定促进性别平等的环境政策,从 WLP 中检查环境问题。因此,性别平等和可持续增长将同时成为目标。
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引用次数: 0
Agricultural Value Added in BRICS: A Panel Data Study 金砖国家的农业增值:面板数据研究
Q1 Economics, Econometrics and Finance Pub Date : 2024-05-08 DOI: 10.32479/ijeep.15808
Sharmiladevi Jekka Chandrasekaran
Sustainable agricultural development is essential for ensuring food security, economic growth and ecological balance, which is a challenging phenomenon to achieve. This phenomenon is studied in the case of BRICS, considering agricultural value added, economic growth, openness to trade, carbon dioxide emission and net foreign direct investment. Panel unit root test, Fixed and Random Effect Model, Panel Cointegration test and Panel Causality are studied. Results of the analysis indicate that in all the BRICS countries, agricultural value added is significant to economic growth, inward foreign direct investment is reduced with agricultural growth, and inward foreign direct investment causes trade openness.  
农业可持续发展对于确保粮食安全、经济增长和生态平衡至关重要,但实现农业可持续发展是一个具有挑战性的现象。本研究以金砖国家为例,考虑了农业增加值、经济增长、贸易开放度、二氧化碳排放量和净外国直接投资,对这一现象进行了研究。研究了面板单位根检验、固定和随机效应模型、面板协整检验和面板因果关系。分析结果表明,在所有金砖国家中,农业增加值对经济增长具有显著影响,外来直接投资随农业增长而减少,外来直接投资导致贸易开放。
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引用次数: 0
Examining the Relationship between Oil Prices and Stock Returns: Evidence from OECD Countries 研究石油价格与股票回报率之间的关系:经合组织国家的证据
Q1 Economics, Econometrics and Finance Pub Date : 2024-05-08 DOI: 10.32479/ijeep.15913
Havane Tembelo, Mustafa Ozyesil
This study uses data from the OECD countries to investigate the relationship between stock returns and oil prices. The study uses daily closing values for analysis and covers the years 2000 - 2022. Oil prices are taken as the independent variable and stock returns as the dependent variable using the panel data analysis. The analysis includes intermediary factors as GDP and inflation. The research begins with a unit root test, followed by a panel co-integration test. Finally, the panel causality test and panel regression results are interpreted. This study primarily aims to explore the effect of oil price volatility on stock returns. Results show a statistically significant positive association between stock returns and oil prices. These findings highlight the importance of oil prices as a determinant of stock returns in the financial markets and provide investors, financial institutions and policymakers valuable insights.
本研究使用经合组织国家的数据来调查股票回报率与石油价格之间的关系。研究使用每日收盘值进行分析,时间跨度为 2000 - 2022 年。通过面板数据分析,将石油价格作为自变量,股票回报率作为因变量。分析包括 GDP 和通货膨胀等中间因素。研究首先进行单位根检验,然后进行面板协整检验。最后,对面板因果检验和面板回归结果进行解释。本研究的主要目的是探讨石油价格波动对股票回报率的影响。结果表明,股票收益率与石油价格之间在统计上存在显著的正相关关系。这些研究结果凸显了石油价格作为金融市场股票回报率决定因素的重要性,并为投资者、金融机构和政策制定者提供了宝贵的启示。
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引用次数: 0
A Decade of Green Economic Literature: An Analysis-Based Bibliometric 绿色经济文献十年:基于分析的文献计量学
Q1 Economics, Econometrics and Finance Pub Date : 2024-05-08 DOI: 10.32479/ijeep.15579
Hamzah E. Alqudah, Mohammad Al-Qudah, Yazan Abdelmajid Abu Huson, Abdalwali Lutfi, Mahmaod Alrawad, Mohammed Amin Almaiah
This research significantly contributes to comprehending the body of work surrounding green economics and sustainable economies by methodically reviewing and categorizing papers from the Web of Science (WoS) core collection. It highlights key authors, subjects, publishing sources, and nations relevant to green economic studies by meticulously analyzing 4,157 papers. Additionally, it constructs detailed visual maps based on referenced sources. By conducting a thorough bibliometric analysis, this study underscores the importance of using such tools to gauge research impact and productivity. Leveraging the WoS Core Collection, particularly the Science Citation Index Expanded and the Social Sciences Citation Index, was deliberate to ensure a comprehensive evaluation of green economic research. The data accentuates the changing landscape of this field, indicating its growing significance and the expanding academic discussions around sustainable economic practices. The research delves into emerging research directions that could inform considerations for a sustainable economy. Despite the marked increase in publications in recent years, signaling heightened interest in green economics and sustainable economy studies, this field remains in its infancy, with limited quantitative studies conducted. Consequently, many findings remain inconclusive, and numerous aspects in literature remain unexplored. Finally, this study outlines both practical and theoretical implications gleaned from its findings.
本研究通过对科学网(WoS)核心文库中的论文进行有条不紊的审查和分类,对理解围绕绿色经济学和可持续经济的研究成果做出了重要贡献。通过对 4,157 篇论文的细致分析,该研究突出了与绿色经济研究相关的主要作者、主题、出版来源和国家。此外,它还根据引用来源构建了详细的可视化地图。通过进行全面的文献计量分析,本研究强调了使用此类工具衡量研究影响力和生产力的重要性。为了确保对绿色经济研究进行全面评估,我们特意利用了 WoS 核心数据库,尤其是《科学引文索引扩展版》和《社会科学引文索引》。这些数据突显了这一领域不断变化的格局,表明其重要性与日俱增,围绕可持续经济实践的学术讨论也在不断扩大。研究深入探讨了可为可持续经济提供参考的新兴研究方向。尽管近年来出版物显著增加,表明人们对绿色经济学和可持续经济研究的兴趣日益浓厚,但这一领域仍处于起步阶段,开展的定量研究有限。因此,许多研究结果仍无定论,文献中的许多方面仍未得到探讨。最后,本研究概述了从研究结果中获得的实践和理论意义。
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引用次数: 0
Airlines’ Corporate Growth and Environmental Conservation: Evidence from Global Carriers and Forwarders 航空公司的企业增长与环境保护:来自全球承运商和货运代理的证据
Q1 Economics, Econometrics and Finance Pub Date : 2024-05-08 DOI: 10.32479/ijeep.15697
Masao Tsujimoto
This study explores how global airlines can achieve growth and environmental conservation using transport, financial performance, and carbon dioxide (CO₂) emissions data before, during, and after the COVID-19 pandemic from 2019 to 2022 with manually collected data for 38 leading international airlines. First, the regression analyses identify a clear range of turning points that airlines should consider in terms of Scopes 1 and 2 CO₂ emissions per employee and cargo ton-kilometers per employee (cargo ton-kilometers (CTK)/EMP) considering the environmental Kuznets Curve (EKC) hypothesis. Second, the deciding factors, including fundamental efforts by the airlines themselves, result from the interaction of three points, which have been encouraged and promoted in the airline industry in recent years. (1) Tighter emissions controls for air transport, (2) investors’ emphasis on environment, society, and governance (ESG), and (3) assessments and guidelines from ratings agencies and economic and environmental organizations. Third, increasing CTK/EMP to verified thresholds and taking an ESG-oriented approach can contribute to airlines’ combined achievement of growth and environmental conservation and related data will expand academic and policy-related research.
本研究通过人工收集的 38 家主要国际航空公司的数据,利用 2019 年至 2022 年 COVID-19 大流行之前、期间和之后的运输、财务业绩和二氧化碳(CO₂)排放数据,探讨全球航空公司如何实现增长和环境保护。首先,根据环境库兹涅茨曲线(EKC)假设,回归分析确定了航空公司在范围 1 和范围 2 每名员工二氧化碳排放量和每名员工货运吨公里数(CTK)/EMP 方面应考虑的转折点范围。其次,决定性因素,包括航空公司自身的根本性努力,是近年来航空业鼓励和推动的三点相互作用的结果。(1) 航空运输排放控制更加严格;(2) 投资者对环境、社会和治理(ESG)的重视;(3) 评级机构和经济环保组织的评估和指导。第三,将 CTK/EMP 提高到经过验证的阈值,并采取以 ESG 为导向的方法,有助于航空公司实现增长与环境保护的结合,相关数据将拓展学术和政策相关研究。
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引用次数: 0
Profitability and Market Value Effect on Carbon Emission Disclosures: The Moderating Role of Environmental Performance 盈利能力和市场价值对碳排放披露的影响:环境绩效的调节作用
Q1 Economics, Econometrics and Finance Pub Date : 2024-05-08 DOI: 10.32479/ijeep.15915
Fitra Dharma, Maran Marimutu, Liza Alvia
Climate change is an issue that is of concern to the global public and scientific community. There is a close relationship between climate change and carbon emissions, which are the primary cause of global warming. Reporting on carbon emissions is essential for corporate accountability to stakeholders when evaluating a company's financial and non-financial performance. Good management of carbon emissions will enhance the company's reputation. This study analyses the impact of company profitability and market value on the disclosure of carbon emissions, with environmental performance serving as a moderating variable in the context of Indonesian public companies. This study concludes that: (1) There is no significant impact on profitability, as measured by Return on Assets, on Carbon Emission Disclosure; (2) The study finds that there is a statistically significant positive relationship between market value, measured by Tobin's Q, and the level of carbon emission disclosure. This relationship is significant at a 5% significance level; (3) The moderating effect of environmental performance on the relationship between profitability, as measured by return on assets, and carbon emission disclosure is found to be insignificant; (4) The significance level of 10% indicates that the relationship between environmental performance, as a measure of a company's environmental practices, and market value, as represented by Tobin's Q, is strengthened concerning the disclosure of carbon emissions. This research can contribute to developing accounting knowledge to close gaps in the body of knowledge regarding the disclosure of carbon emissions in developing nations, particularly Indonesia.
气候变化是全球公众和科学界关注的问题。气候变化与碳排放密切相关,而碳排放是全球变暖的主要原因。在评估公司的财务和非财务业绩时,碳排放报告对于企业向利益相关者负责至关重要。良好的碳排放管理将提高公司的声誉。本研究以印度尼西亚上市公司为背景,分析了公司盈利能力和市场价值对碳排放披露的影响,并以环境绩效作为调节变量。本研究得出以下结论(1)以资产回报率衡量的盈利能力对碳排放披露没有显著影响;(2)研究发现,以托宾 Q 衡量的市场价值与碳排放披露水平之间存在统计意义上的显著正相关关系。这种关系在 5%的显著性水平下显著;(3)研究发现,环境绩效对以资产回报率衡量的盈利能力与碳排放披露之间关系的调节作用不显著;(4)10% 的显著性水平表明,在碳排放披露方面,作为公司环境实践衡量标准的环境绩效与以托宾 Q 值为代表的市场价值之间的关系得到了加强。这项研究有助于发展会计知识,填补发展中国家(尤其是印度尼西亚)在碳排放披露方面的知识空白。
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引用次数: 0
Linking Non-renewable and Renewable Electricity and Government Expenditures to Environmental Degradation: Evidence of 10 Newly Industrialized Countries 将不可再生和可再生电力及政府支出与环境退化联系起来:10 个新兴工业化国家的证据
Q1 Economics, Econometrics and Finance Pub Date : 2024-05-08 DOI: 10.32479/ijeep.15688
Najeh Bouchoucha, Mohamed Ghandri, I. Yahyaoui
This research aims to identify the relationship between non-renewable electricity (NRE), renewable electricity (RE) and government expenditures (EXPD) on environmental degradation using the ARDL model for 10 Newly Industrialized Countries (NIC) during the period 1990-2021. Our empirical findings show that the NRE increases the CO2 emissions, however the RE decrease the CO2 emissions in the long and short run. For the effect of governement expenditure on the environment, it may be classified as direct and indirect. In fact, EXPD affect positively the CO2 emissions. In contrast, The indirect effect operates through the interaction between EXPD and NRE and RE. Our results demonstrate that the interaction between EXPD and NRE affects negatively the CO2 emissions. Nevertheless, the impact of the interaction between EXPD and RE on the CO2 emissions is more important. The results show also there is a bidirectional causality between each variable and CO2 emissions. With the empirical findings as a basis, we suggest that the NI countries should reduce NRE consumption and enhance the environmental expenditures so that they may produce more RE to combat environmental issues.
本研究旨在利用 ARDL 模型,识别 1990-2021 年间 10 个新兴工业化国家的不可再生能源电力(NRE)、可再生能源电力(RE)和政府环境退化支出(EXPD)之间的关系。我们的实证研究结果表明,从长期和短期来看,新能源会增加二氧化碳排放量,而可再生能源则会减少二氧化碳排放量。政府支出对环境的影响可分为直接和间接影响。事实上,预算外支出会对二氧化碳排放产生积极影响。而间接影响则是通过预算外支出与 NRE 和 RE 之间的相互作用产生的。我们的结果表明,EXPD 和 NRE 之间的交互作用对二氧化碳排放有负面影响。然而,EXPD 和 RE 之间的相互作用对二氧化碳排放的影响更为重要。结果还显示,每个变量与二氧化碳排放量之间都存在双向因果关系。在实证研究结果的基础上,我们建议北欧国家减少净可再生能源消费,增加环保支出,从而生产更多的可再生能源来应对环境问题。
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引用次数: 0
Dynamic Evaluation of Environmental Effects Associated with the Inclusion of Hydrogen-powered Vehicles in Colombia 哥伦比亚氢动力汽车对环境影响的动态评估
Q1 Economics, Econometrics and Finance Pub Date : 2024-05-08 DOI: 10.32479/ijeep.15694
Nathaly Martinez-Escobar, J. C. Osorio-Gómez, Jose Alejandro Sierra-Castillo
Currently, the generation of CO2 emissions into the environment has increased due to the use of fossil fuels by the transportation sector and other economic sectors, motivating governments to propose mitigation actions. As a result, the search for zero-emission transportation alternatives has gained momentum, with Hydrogen technology being one of the promising solutions due to its clean and efficient energy source. In compliance with this, the Hydrogen roadmap was developed in Colombia, which seeks to encourage the use of hydrogen as a fuel and energy generator in the country. In this study, the current composition of the vehicle fleet was characterized, then a dynamic simulation model was constructed for the replacement of fossil fuel vehicles with zero-emission vehicles, considering the particularities of the country, to finally analyze the generation of CO2 in the vehicle fleet from different scenarios related to the policies proposed by the government of Colombia and stipulated in the roadmap of hydrogen. With this, it was possible to demonstrate the positive impact of taking measures for vehicle replacement in the long term. Additionally, the model could be employed in other countries, considering the particularities of the vehicle fleet and the regulations specific to the regions.
目前,由于交通部门和其他经济部门使用化石燃料,向环境排放的二氧化碳有所增加,促使各国政府提出减排行动。因此,寻找零排放交通替代品的呼声日益高涨,而氢能技术因其清洁高效的能源来源而成为前景广阔的解决方案之一。为此,哥伦比亚制定了氢气路线图,旨在鼓励在该国使用氢气作为燃料和能源发电机。在这项研究中,首先对当前车队的组成进行了分析,然后根据哥伦比亚的具体情况,建立了一个用零排放车辆取代化石燃料车辆的动态模拟模型,最后分析了与哥伦比亚政府提出的政策和氢气路线图规定的不同方案有关的车队二氧化碳排放量。由此可以证明,从长远来看,采取措施更换车辆会产生积极影响。此外,考虑到车队的特殊性和各地区的具体规定,该模型也可用于其他国家。
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引用次数: 0
期刊
International Journal of Energy Economics and Policy
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