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Comparison of Thermal, Flywheel and Supercapacitor Energy Storage for an African Microgrid 非洲微电网热储能、飞轮储能和超级电容储能的比较
Pub Date : 2020-11-23 DOI: 10.2139/ssrn.3735384
T. Hendricks, M. Adonis
Due to the intermittent nature of renewable energy sources, energy storage systems are required to meet the demands of consumers when conditions for power generation is not optimum, with respect to, the energy generation systems used. The purpose of this study is to establish the ideal energy storage system to meet the demands of an African microgrid, where an African Microgrid is described as a microgrid using energy sources and man-power indigenous to Africa. There are many benefits that microgrids yield over traditional central grids. Central grids consist of a series of networks which connects consumers to energy suppliers, however when the energy supplier fails to supply energy, many consumers are affected. A microgrid, which may or may not be connected to the central grid, serves a smaller number of consumers than the traditional central grid, however, should a fault occur in the power generation or distribution process, fewer people will be affected. These advantages become ideal in areas where storms are prevalent and the microgrid can disconnect from the main grid, using its respective means of energy production to serve its designated consumers. Microgrids are also able to produce energy via means of generators, renewable resources and batteries. This paper will compare thermal, flywheel and supercapacitor energy storage systems. These systems will be coupled to a power generation system that serves communityof100households, with a daily use of5kWh, in the country with the lowest electrification rate in Burundi. The energy storage systems will be modeled using HOMER where the variables such as, nominal capacities, overall efficiencies, lifespan, energy input and output, and cost will be measured and compared. The energy storage system with the greatest attributes, with respect to the variables mentioned, will be deemed the ideal energy storage mechanism for an African Microgrid.
由于可再生能源的间歇性,对于所使用的能源发电系统而言,储能系统需要在发电条件不理想的情况下满足消费者的需求。本研究的目的是建立理想的储能系统,以满足非洲微电网的需求,其中非洲微电网被描述为使用非洲本土能源和人力的微电网。与传统的中央电网相比,微电网有很多好处。中心电网由一系列连接消费者和能源供应商的网络组成,但是当能源供应商无法提供能源时,许多消费者都会受到影响。微电网可能与中央电网相连,也可能不与中央电网相连,与传统的中央电网相比,微电网服务的用户数量较少,但如果在发电或配电过程中发生故障,受影响的人数较少。这些优势在风暴频发的地区变得非常理想,微电网可以与主电网断开连接,利用其各自的能源生产方式为其指定的用户服务。微电网还能够通过发电机、可再生资源和电池生产能源。本文将比较热储能系统、飞轮储能系统和超级电容储能系统。这些系统将与一个发电系统相结合,为布隆迪电气化率最低的国家的100户社区提供每日5kwh的电力。储能系统将使用HOMER进行建模,其中将测量和比较标称容量、总体效率、寿命、能量输入和输出以及成本等变量。就上述变量而言,具有最大属性的储能系统将被认为是非洲微电网的理想储能机制。
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引用次数: 0
Emerging Trends in Resource-Rich Sub-Saharan Africa and a Spotlight on the Nigerian Transitional Energy Market 资源丰富的撒哈拉以南非洲的新趋势和尼日利亚能源市场转型的焦点
Pub Date : 2020-08-23 DOI: 10.2139/ssrn.3679532
T. Oyewunmi, Ivie Ehanmo
There is no gainsaying that energy enables growth in both developing and developed economy contexts. The innovations that lead to (i) the roll-out of long-distance energy networks operated by vertically-integrated utilities as a means of delivering affordable and reliable energy, and (ii) viable wholesale markets for large-scale demand points such as steel and manufacturing industries; has been key in enabling industrialization and modern standards of living over the past century. In several jurisdictions, the traditional energy supply systems gradually gave way to the paradigm of creating competitive wholesale markets complemented by open access to those networks and now more recently an increasing array of distributed energy resources and/or variable renewable energy systems as part of the drive towards de-carbonization and sustainability. Before COVID-19 struck, several countries in Sub-Saharan Africa (SSA) were grappling with the demands of managing rapid urbanization and economic development, reducing poverty, raising standards of living, and economic diversification to mitigate the impact of the boom and bust price cycles of exported resources (especially oil) in the international markets. Arguably, a key factor in the medium to the long-term realization of various economic and development aspirations will be the degree of access to affordable and reliable modern energy services. Notably, several Sub-Saharan African countries are adopting such paradigms and approaches to energy, even though there are still considerable institutional developments and investments required to achieve the desired objectives of secure, reliable, and affordable energy access for all.[2] From the late 1990s and 2000s to date, countries such as Nigeria, South Africa, Kenya, etc. facilitated the participation of privately-owned Independent Power Producers (IPP) to operate along-side state-owned utilities. Others such as Senegal and Ghana as discussed in this paper are likewise implementing reforms to their traditional utility model for electricity supply and seeking to develop institutions such as independent system operators to carry out responsibilities for least-cost generation planning, power procurement, system operation, and power dispatch, and transmission and distribution planning. In the unfolding drive towards universal energy access and a more sustainable path to support rapid economic development and growth; the legal framework and regulatory institutions have a pivotal role to play. It is important to have a coherent, clear and efficient framework comprising- well-equipped and resourceful independent institution(s) for economic regulation, creating an equitable and rules-based playing field for energy utilities, consumers, and private operators; and cost-reflective tariffs for utilities, while still ensuring the obligation to serve and provide reliable and affordable energy. Given the growing inclination for decentralized systems using natural gas
无可否认,无论是在发展中国家还是发达国家,能源都能促进经济增长。这些创新导致(i)推出由垂直整合的公用事业公司运营的远距离能源网络,作为提供负担得起的可靠能源的一种手段,以及(ii)为钢铁和制造业等大规模需求点提供可行的批发市场;在过去的一个世纪里,它一直是实现工业化和现代生活水平的关键。在一些司法管辖区,传统的能源供应系统逐渐让位于建立竞争性批发市场的范例,同时开放进入这些网络,最近又有越来越多的分布式能源和/或可变的可再生能源系统,作为推动去碳化和可持续性的一部分。在2019冠状病毒病爆发之前,撒哈拉以南非洲的一些国家正在努力应对管理快速城市化和经济发展、减少贫困、提高生活水平和经济多样化的需求,以减轻国际市场上出口资源(特别是石油)价格涨跌周期的影响。可以说,中长期实现各种经济和发展愿望的一个关键因素将是获得负担得起和可靠的现代能源服务的程度。值得注意的是,几个撒哈拉以南非洲国家正在采用这种能源模式和方法,尽管要实现人人享有安全、可靠和负担得起的能源的预期目标,仍需要大量的体制发展和投资。[2]从20世纪90年代末到21世纪初至今,尼日利亚、南非、肯尼亚等国促进了私营独立电力生产商(IPP)与国有公用事业公司一起运营。其他国家,如本文所讨论的塞内加尔和加纳,同样正在对其传统的电力供应实用模式进行改革,并寻求发展独立系统运营商等机构,以承担最低成本发电规划、电力采购、系统运营、电力调度以及输配电规划的责任。在推动实现普遍能源获取和更可持续的道路以支持经济快速发展和增长的过程中;法律框架和监管机构可以发挥关键作用。重要的是要有一个连贯、清晰和有效的框架,包括:设备齐全、资源丰富的独立经济监管机构,为能源公用事业、消费者和私营运营商创造一个公平和基于规则的竞争环境;对公用事业征收反映成本的关税,同时仍确保有义务提供可靠和负担得起的能源。鉴于越来越倾向于使用天然气和分布式可再生能源的分散系统,作为到达传统的基于电网的网络服务不足的地区的手段,这种法律框架除其他外将为以下方面提供基础:(i)支持社区融资;(二)微电网和独立配电网的建设和运行;(iii)寻求市场准入的第三方发电机和运营商;(四)明确设施选址要求;保证各项参数以确保可负担性和可靠性;(六)制定能效标准;(七)制定节能和需求响应措施;(八)建立和管理跨境互联网络;(九)确保民间社会有机会参与能源决策过程。本文的目的是在第二部分中简要介绍撒哈拉以南非洲地区一些选定国家能源部门转型和改革的新趋势和前景。具体来说,它举例说明了南非、塞内加尔、加纳和肯尼亚的相关发展。然后重点介绍尼日利亚转型能源市场最近的法律和监管发展,作为第三部分中其他人可能面临的合理挑战、解决方案和机遇的路标。
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引用次数: 0
Recycling of Used Engine Oil for Cooking Fuel Using Solar Thermal Pyrolysis 利用太阳热裂解法回收废机油作烹饪燃料
Pub Date : 2019-06-01 DOI: 10.2139/ssrn.3710661
Behiwot Tilahun, Venkata, Ephrem
[enter Abstract Body]Engine oil is lubricating oil that has been used to reduce friction between moving parts, and as a result of such use, physical contamination and chemical impurities of it have occurred. Waste lubricant oil is one of the most serious pollutants that are generated in most areas of our world. Likewise, in Jimma town, used lubricating oils that are disposed from private garages and other government institutions are a source of suffering for the surrounding societies. This is mainly because of waste lubricating oils are one of the major contributing factors for environmental pollution. Many scientific studies have also indicated that because of ineffective disposal mechanisms, waste lubricating oils have been causing serious environmental challenge and harmful health issue. Cognizant to this fact, this thesis attempts to make an analysis of the processes of converting waste oil into more valuable products such as fuel. Among others, the main way that the researcher had practised for recycling of used lubricating oils is treating by pyrolysis process, which consists of recovering the original base oil to be reused in the formulation of new products or generate different product from its original base like fuels. To achieve the required result, multivariate experimental practices were adopted for this study. The system adopted in the experiment was covering conversion of the waste engine oil in to fuel product by pyrolysis with pre or post-chemical treatment. Besides, the energy source used for conducting the process was solar thermal energy using parabolic dish collector. Following experimental analysis in different procedures, the fuels which had different calorific value (characterization was performed by Geological Survey of Ethiopia, Geochemical Laboratory Directorates) were generated. The result of this experimental study indicated that from the sampled eight experiments, the best fuel which can be used for cooking stove that has 44,678.88 KJ/Kg calorific value, 840 Kg/m3 density, 3.65 mm2/s kinematic viscosity and 52oC flash point was found. It has been concluded that, production of fuel from waste engine oil using solar thermal pyrolysis is a profitable business by replacing kerosene which is currently imported from abroad and solving environmental defects which have been caused due o improper handling of WEO.
【摘要正文】发动机油是为了减少运动部件之间的摩擦而使用的润滑油,由于这种使用,它产生了物理污染和化学杂质。废润滑油是世界上大多数地区产生的最严重的污染物之一。同样,在Jimma镇,从私人车库和其他政府机构处理的用过的润滑油是周围社会的痛苦之源。这主要是因为废润滑油是造成环境污染的主要因素之一。许多科学研究也表明,由于废润滑油处理机制不健全,已造成严重的环境挑战和有害健康问题。认识到这一事实,本文试图对将废油转化为更有价值的产品(如燃料)的过程进行分析。其中,研究人员实践的废旧润滑油回收利用的主要方式是热解处理,即回收原有的基础油,在新产品的配方中重复使用,或从原有的基础油生产不同的产品,如燃料。为了达到预期的结果,本研究采用了多变量实验实践。实验采用的体系是将废机油经化学预处理或化学后处理后热解转化为燃料产品。此外,进行该过程的能源是利用抛物面碟式集热器的太阳能热能。经过不同程序的实验分析,产生了具有不同热值的燃料(由埃塞俄比亚地质调查局地球化学实验室理事会进行表征)。实验研究结果表明,从8个实验样品中,优选出热值为44,678.88 KJ/Kg、密度为840 Kg/m3、运动粘度为3.65 mm2/s、闪点为52℃的炉灶燃料。综上所述,利用太阳能热裂解技术从废机油中生产燃料,可以替代目前从国外进口的煤油,并解决因废油处理不当而造成的环境缺陷,是一项有利可图的业务。
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引用次数: 0
Precautionary Storage in Electricity Markets 电力市场的预防性储存
Pub Date : 2016-02-25 DOI: 10.2139/ssrn.2738004
Tunç Durmaz
As renewable energy depends on meteorological shocks and is non-controllable, the overall energy production becomes riskier with the rising renewable share. Although this has led to a renewed interest in storage technologies, not much consideration has been given to energy storage due to precautionary motives. In our study, we look at to what extent a convex marginal utility (prudence) and a convex marginal cost (frugality) can spur precautionary energy storage. We set up a simple theoretical model of energy consumption and production with intermittent renewable sources, dispatchable systems, and energy storage. First, we characterize the optimum and demonstrate how prudence and frugality can lead to higher levels of energy storage. By applying our findings to perfectly competitive markets, we further show that prudence and frugality increase the market energy price through higher demand for energy storage and decrease price volatility. Our analysis can have implications for inventory decisions in various other industries where firms face capacity constraints and are exposed to production risks.
由于可再生能源依赖于气象冲击且不可控,因此随着可再生能源份额的上升,整体能源生产的风险也越来越大。尽管这引起了人们对储能技术的重新关注,但出于预防动机,储能技术并没有得到太多的考虑。在我们的研究中,我们着眼于凸边际效用(审慎)和凸边际成本(节俭)在多大程度上可以刺激预防性能源储存。我们建立了一个关于间歇性可再生能源、可调度系统和储能的能源消费和生产的简单理论模型。首先,我们描述了最优的特性,并展示了谨慎和节俭是如何导致更高水平的能量储存的。通过将我们的研究结果应用于完全竞争市场,我们进一步表明,谨慎和节俭通过提高储能需求来提高市场能源价格,并降低价格波动。我们的分析可以对企业面临产能限制并面临生产风险的各种其他行业的库存决策产生影响。
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引用次数: 0
What Makes Rural Households Use Traditional Fuel? Empirical Evidence from India 是什么让农村家庭使用传统燃料?来自印度的经验证据
Pub Date : 2015-12-22 DOI: 10.2139/ssrn.2753230
Aditi Bhattacharyya, Daisy Das
This paper investigates the effects of different types of cooking fuels on the technical efficiency of household meal production in rural India. Rural households in India use for cooking either traditional fuels like firewood, dung, crop residue, and coal or modern fuels like liquefied petroleum gas (LPG) and kerosene, or a combination of both traditional and modern fuels. Using the stochastic frontier method, this paper estimates the influence of different types of cooking fuel and other household level characteristics on the technical efficiency of household meal production. We use a representative sample of 3880 rural households from the India Human Development Survey, 2008. Our results indicate that efficiency of meal preparation is significantly higher when households use either a traditional or a combination of both traditional and modern fuels than if they use modern fuels alone. Thus, results of this paper shed light on reasons other than cost behind the overwhelming popularity of traditional fuels in spite of their adverse health and environmental effects. This result is likely to be driven by the capacity constraint imposed by LPG and kerosene burners in cooking a large quantity of food at a time. Our study identifies use of traditional fuel as a viable option for reducing energy poverty in rural India, and recommends extensive policy for supplying improved wood burning cook stoves and afforestation to reduce the harmful pollution effects of open fire. The policy makers should also emphasize on provision of biogas plant and biomass gasifier along with afforestation. Further, our study recognizes the need for developing and supplying more efficient cooking stoves for modern fuels to promote higher use of clean energy sources. Our results also suggest policy intervention in improving women’s education, household income, provision of ration card, and providing government support in acquiring improved cooking stoves for increasing efficiency of meal production at the household level.
本文研究了不同类型的烹饪燃料对印度农村家庭膳食生产技术效率的影响。印度的农村家庭要么使用木柴、粪便、农作物残渣和煤炭等传统燃料,要么使用液化石油气(LPG)和煤油等现代燃料,要么使用传统和现代燃料的结合。本文采用随机前沿法,估计了不同类型的烹饪燃料和其他家庭层面特征对家庭膳食生产技术效率的影响。我们使用了2008年印度人类发展调查中3880个农村家庭的代表性样本。我们的研究结果表明,当家庭使用传统燃料或传统和现代燃料的组合时,饭菜准备的效率明显高于单独使用现代燃料。因此,本文的结果揭示了尽管传统燃料对健康和环境有不利影响,但其压倒性普及背后的成本以外的原因。这一结果很可能是由于LPG和煤油燃烧器在一次烹饪大量食物时造成的容量限制所致。我们的研究确定使用传统燃料是减少印度农村能源贫困的一个可行选择,并建议制定广泛的政策,提供改进的燃木炉灶和植树造林,以减少明火的有害污染影响。政策制定者还应重视在植树造林的同时提供沼气厂和生物质气化炉。此外,我们的研究认识到有必要为现代燃料开发和提供更高效的炉灶,以促进更多地使用清洁能源。我们的研究结果还建议在改善妇女教育、家庭收入、提供配给卡以及为获得改良炉灶提供政府支持方面进行政策干预,以提高家庭膳食生产效率。
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引用次数: 3
Information Provision, Market Incentives, and Household Electricity Consumption: Evidence from a Large-Scale Field Trial 信息提供、市场激励和家庭用电:来自大规模实地试验的证据
Pub Date : 2015-12-14 DOI: 10.2139/ssrn.2703947
Steve Martin, N. Rivers
We evaluate a large-scale field deployment in which close to 7,000 households subject to time-of-using electricity pricing were provided with an in-home display that provides real-time feedback on electricity consumption and price. We find that receipt of the device results in a reduction in average electricity consumption of about 3%, with this effect roughly constant across hours of the day. We find evidence that households respond to this information in part by forming habits rather than adjusting their load-shifting behavior. We also find that real-time information has an ambiguous effect on household responsiveness to electricity prices, counter to existing literature where information increases responsiveness to price.
我们评估了一项大规模的现场部署,在该部署中,近7000户家庭受到用电时间定价的约束,他们在家中安装了一个显示器,该显示器提供了电力消耗和价格的实时反馈。我们发现,接收该设备导致平均耗电量减少约3%,这种效果在一天中的几个小时内大致不变。我们发现有证据表明,家庭对这些信息的部分反应是形成习惯,而不是调整他们的负荷转移行为。我们还发现,实时信息对家庭对电价的反应性有模糊的影响,与现有文献中信息增加对价格的反应性相反。
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引用次数: 6
Competitive Equilibrium in the Italian Wholesale Electricity Market 意大利电力批发市场的竞争均衡
Pub Date : 2015-06-19 DOI: 10.2139/SSRN.2620643
The market power analysis in electricity market is relevant for understanding the competitive development of the industry’s restructuring and the liberalization process. The paper analyzes the market power exercised by power generators in the Italian wholesale electricity market. Following the approach of Wolak (2003, 2009), the extent of market power is measured using the Lerner index computed as the inverse of arc elasticity of the residual demand faced by each Cournot competitors. Then, the market supply curves have been adjusted to entail market power effects and the new market resolutions were derived. The new equilibrium prices are the competitive ones and represent the market clearing price that would have been if the electricity market was competitive and the effects of unilateral market power were removed.
电力市场中的市场力量分析对于理解电力行业结构调整和市场化进程的竞争发展具有重要意义。本文分析了意大利批发电力市场中发电企业所行使的市场权力。遵循Wolak(2003,2009)的方法,使用Lerner指数作为每个古诺竞争者所面临的剩余需求的弧弹性的倒数来衡量市场力量的程度。然后,对市场供给曲线进行调整,使其包含市场力量效应,并推导出新的市场决议。新的均衡价格是竞争性的价格,代表了在电力市场是竞争性的并且单边市场力量的影响被消除的情况下的市场出清价格。
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引用次数: 2
Green Performs Better: Energy Efficiency and Financial Return on Buildings 绿色表现更好:建筑的能源效率和财务回报
Pub Date : 2012-12-06 DOI: 10.1108/JCRE-12-2012-0031
Marcelo Cajias, D. Piazolo
This study investigates the effect of energy consumption on the financial performance of residential buildings in a large panel framework. Based on prior European studies regarding the use of energy performance certificates (EPCs), we analyse whether the responsible use of energy leads to a significant price differentiation between 2008 and 2010. Based on the IPD Databank and the German statistical office, our descriptive portfolio results show that energy efficient buildings have an up to 3.15% higher return and 0.76 €/m² higher rent prices than inefficient assets. Furthermore, (un-) conditional regression results provide evidence that one percent decline in energy consumption affects the total return of buildings positively by 0.015%, all else equal. The hedonic results additionally show that one percent energy conservation boosts rent prices by 0.08% and market value by 0.45%. Overall, our study presents alternative methodologies when describing and estimating hedonic data and offers the first empirical evidence of the energy price premium in German residential markets.
本研究探讨了能源消耗对大型面板框架住宅建筑财务绩效的影响。基于之前欧洲关于使用能源绩效证书(epc)的研究,我们分析了能源的负责任使用是否导致2008年和2010年之间的显著价格差异。基于IPD数据库和德国统计局,我们的描述性投资组合结果表明,节能建筑的回报率比低效资产高3.15%,租金价格比低效资产高0.76欧元/平方米。此外,(非)条件回归结果提供证据表明,在其他条件相同的情况下,能源消耗下降1%对建筑物总收益的影响为0.015%。另外,享乐主义的结果表明,每节约1%的能源,租金价格就会上涨0.08%,市场价值就会上涨0.45%。总的来说,我们的研究在描述和估计享乐数据时提出了替代方法,并提供了德国住宅市场能源价格溢价的第一个经验证据。
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引用次数: 140
Do Fewer People Mean Fewer Cars? – Population Decline and Car Ownership in Germany 人少就意味着车少吗?-德国人口下降和汽车保有量
Pub Date : 2012-11-01 DOI: 10.2139/ssrn.2200408
Nolan Ritter, Colin Vance
Drawing on household data from Germany, this study econometrically analyzes the determinants of automobile ownership, focusing specifically on the extent to which decreases in family size translate into changes in the number of cars at the national level. Beyond modeling several variables over which policy makers have direct leverage, including the proximity of public transit, fuel prices and land use density, the analysis uses the estimated coefficients from a multinomial logit model to simulate car ownership rates under alternative scenarios pertaining to demographic change and other socio-economic variables. Our baseline scenario predicts continued increases in the number of cars despite decreases in population, a trend that is attributed to continued increases in household income.
利用德国的家庭数据,本研究从计量经济学角度分析了汽车拥有量的决定因素,特别关注家庭规模的减少在多大程度上转化为国家层面上汽车数量的变化。除了对政策制定者可以直接影响的几个变量(包括公共交通的接近程度、燃料价格和土地使用密度)进行建模之外,该分析还使用多项logit模型的估计系数来模拟与人口变化和其他社会经济变量相关的替代情景下的汽车拥有率。我们的基线情景预测,尽管人口减少,但汽车数量仍将继续增加,这一趋势归因于家庭收入的持续增长。
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引用次数: 42
Net Energy Analysis in a Ramsey-Hotelling Growth Model Ramsey-Hotelling增长模型中的净能量分析
Pub Date : 2012-03-21 DOI: 10.2139/ssrn.2026856
Arturo Macias, M. Matilla-García
This article presents a dynamic growth model with energy as an input in the production function. The available stock of energy resources is ordered by a quality parameter based on energy accounting: the “Energy Return on Energy Invested” (EROI). In our knowledge this is the first paper where EROI fits in a neoclassical growth model (with individual utility maximization and market equilibrium), establishing the economic use of “net energy analysis” on a firmer theoretical ground. All necessary concepts to link neoclassical economics and EROI are discussed before their use in the model, and a comparative static analysis of the steady states of a simplified version of the model is presented.
本文提出了一个以能量为生产函数输入的动态增长模型。可利用的能源存量由一个基于能源核算的质量参数来排序:“能源投资的能源回报”(EROI)。据我们所知,这是第一篇将EROI纳入新古典增长模型(个人效用最大化和市场均衡)的论文,在更坚实的理论基础上建立了“净能源分析”的经济用途。在模型中使用新古典经济学和EROI之前,讨论了将它们联系起来的所有必要概念,并对模型的简化版本的稳态进行了比较静态分析。
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引用次数: 21
期刊
SRPN: Other Politics & Energy (Topic)
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