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Flow Pattern and Hydraulic Parameter Characteristics of the Different Topographic Position in the Small Catchment 小流域不同地形位置的流态与水力参数特征
Pub Date : 2019-08-27 DOI: 10.11648/J.IJEEE.20190404.13
W. Lingling, Zuo Zhongguo, Lou Xuan, Huang Jing, Hou Xinxin
Flow pattern and hydraulic parameter characteristics of the different topographic position in the “slope-gully-basin” system under the rainfall intensities of 60, 90 and 120 mm/h using generalized small watershed model with the simulated rainfall experiment. The results show that the increase of the rainfall intensity will result in the increase of the Reynolds number. During the whole experiment, only when the rainfall intensity is 60 mm/h, the flow pattern of the hilly-slope is laminar flow. The flow patterns of the other geomorphic position are all turbulent flow. Moreover, the Reynolds number of slope flow is much less than that of channel flow. With the increase of rainfall intensity, flow patterns of the all different geomorphic position changed from the stratum flow into torrent flow. Furthermore, the Froude number increases first and then decreases with the increase of rainfall intensity. For the resistance coefficient of the overland flow, with the increase of rainfall intensity, the resistance coefficient of overland flow and channel flow decreases obviously. For the spatial distribution of resistance coefficient, the maximum occurs at the hilly-slope and the minimum at the channel.
基于广义小流域模型和模拟降雨试验的60、90和120 mm/h降雨强度下“坡沟盆地”系统不同地形位置的流态和水力参数特征结果表明,降雨强度的增大会导致雷诺数的增大。在整个试验过程中,只有当降雨强度为60 mm/h时,坡面流动形态为层流。其他地貌位置的流型均为紊流。此外,坡流的雷诺数远小于通道流。随着降雨强度的增大,各地貌位置的流型由地层流转变为激流流。随着降雨强度的增加,弗劳德数先增大后减小。对于坡面流的阻力系数,随着降雨强度的增加,坡面流和渠道流的阻力系数明显减小。在空间分布上,坡面阻力系数最大,河道阻力系数最小。
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引用次数: 0
TSP, PM10 and PM2.5 Distribution Characteristics in the Thermal Power Plants in Korea 韩国火电厂TSP、PM10和PM2.5分布特征
Pub Date : 2019-08-10 DOI: 10.11648/J.IJEEE.20190404.11
G. Song, Young-Hoon Moon, Jong-Ho Joo, A-Yeoung Lee, Jae-Bok Lee
In this study, the emission characteristics and heavy metal contents of TSP, PM10 and PM2.5 pollutants from three thermal power plants in Korea were investigated and compared to the electric production capacity, type of fuel and sort of air-pollution-control device. For the measurement and analysis, Korean standard test method US EPA method were used. The average concentration of TSP, PM10 and PM2.5 emitted from Plant A were 7.39, 6.16, 4.83 mg/Sm3, Plant B was 5.82, 4.87, 2.35 mg/Sm3 and Plant C was 1.54, 1.40, 10.02 mg/Sm3, respectively. Plant A that uses heavy oil as the main fuel showed higher TSP, PM10 and PM2.5 than Plant B that uses mostly anthracite coal, and plant B showed higher TSP, PM10 and PM2.5 than Plant C that mainly uses bituminous coal. The concentration of fine particles decreased as electricity-production capacity increased. The fractions of PM10 and PM2.5 in TSP were relatively high in tested plants; this result means that more fine particles than coarse particles were emitted from all stacks. The distribution of heavy metals by particle size showed similar trends in all plants. The concentration of Zn and Mn in TSP, PM10 and PM2.5 showed higher than the others in all plants. These results confirm that the content of heavy metals in the particulate matter is influenced by the fuel that the plant uses.
本研究调查了韩国三个火力发电厂的TSP、PM10和PM2.5污染物的排放特征和重金属含量,并与电力生产能力、燃料类型和空气污染控制装置类型进行了比较。测量和分析采用韩国标准测试方法和美国EPA方法。A厂排放的TSP、PM10和PM2.5平均浓度分别为7.39、6.16、4.83 mg/Sm3, B厂排放的TSP、PM10和PM2.5平均浓度分别为5.82、4.87、2.35 mg/Sm3, C厂排放的TSP、PM10和PM2.5平均浓度分别为1.54、1.40、10.02 mg/Sm3。以重油为主要燃料的A厂的TSP、PM10和PM2.5均高于以无烟煤为主要燃料的B厂,B厂的TSP、PM10和PM2.5均高于以烟煤为主要燃料的C厂。细颗粒物浓度随着发电量的增加而降低。被测植物TSP中PM10和PM2.5含量较高;这一结果意味着从所有烟囱中释放出的细颗粒多于粗颗粒。重金属在各植物中按粒径分布的趋势相似。TSP、PM10和PM2.5中Zn和Mn的浓度均高于其他植物。这些结果证实,颗粒物质中的重金属含量受到工厂使用的燃料的影响。
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引用次数: 0
The Impact of Disaggregated Electricity Generation on Economic Growth: MENA Countries (2005-2014) 分类发电对经济增长的影响:中东和北非国家(2005-2014)
Pub Date : 2019-07-31 DOI: 10.11648/J.IJEEE.20190403.11
Haidy Amer
This paper examines the impact of electricity generation on economic growth using data for a panel of 12 countries elected from MENA region over the period 2005-2014. The paper contributes to the literature in several ways. First, in contrast to the present literature which focuses on electricity consumption, this paper focuses on the impact of electricity generation on economic growth. This is because not all of the electricity that is generated is eventually consumed, due to dissemination losses, stolen power and the other so called “non-technical losses” which makes it necessary to examine the impact of electricity generation on economic growth. Second, we disaggregate the influence of total electricity generation on growth into renewable and non-renewable effects. The fact that the renewable electricity is gaining a great importance and the global care for its implementation makes it necessary to study its effect in the MENA region given the great potential of these sources in the region. Never the less, the effect of such sources of electricity on the economic growth is being investigated while at the same time using control variables like trade openness, financial development and CO2 emissions. Third, the study is different from previous studies in focusing on granger causality and/or cointegration by estimating the effect of electricity generation on growth using the System Generalized Method of Moments(GMM). GMM is being used given that electricity generation and many of the other regressors in the model may be jointly determined with GDP growth and thus be treated as endogenous variables a matter that can be handled by the GMM. Our results indicate a strong negative and statistically significant relationship between renewable and non-renewable electricity generation indicating the possibility of substitution between the two sources in these selected countries, yet with different impact on the economic growth.
本文利用2005-2014年期间中东和北非地区选出的12个国家的数据,考察了发电对经济增长的影响。这篇论文在几个方面对文献有贡献。首先,与现有文献关注电力消费不同,本文关注的是发电对经济增长的影响。这是因为,由于传播损失、电力被盗和其他所谓的“非技术损失”,并非所有产生的电力最终都被消耗,因此有必要审查发电对经济增长的影响。其次,我们将总发电量对经济增长的影响分为可再生和不可再生两类。可再生电力越来越重要,全球对其实施的关注使得有必要研究其在中东和北非地区的影响,因为这些资源在该地区具有巨大的潜力。尽管如此,这些电力来源对经济增长的影响仍在研究中,同时使用了贸易开放、金融发展和二氧化碳排放等控制变量。第三,与以往的研究不同,本研究侧重于格兰杰因果关系和/或协整,利用系统广义矩量法(System Generalized Method of Moments, GMM)估计发电对生长的影响。使用GMM是考虑到发电量和模型中的许多其他回归量可能与GDP增长共同决定,因此被视为内生变量,可以由GMM处理。我们的研究结果表明,可再生能源和不可再生能源发电之间存在很强的负相关关系,这表明在这些选定的国家,两种能源之间存在替代的可能性,但对经济增长的影响不同。
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引用次数: 0
Reliability Enhancement of Distribution Substation by Using Network Reconfiguration a Case Study at Debre Berhan Distribution Substation 用网络重构技术提高配电变电站的可靠性——以德勃雷·伯尔汉配电变电站为例
Pub Date : 2019-07-31 DOI: 10.11648/J.IJEEE.20190402.12
Degarege Anteneh, B. Khan
Most of developing country including Ethiopia distribution systems has received considerably less of the attention to reliability modeling and evaluation than have generating and transmitting systems. Now a day life is directly or indirectly depends on electric power so that utility should deliver reliable power every day for 24 hours and each year for 8760 hours to satisfy human needs and to perform their works as much as possible with less economy. This paper focuses on enhancement of distribution system of Debre Berhan distribution network. The reliability assessment has been done on four feeders of 15kV and 33 kV to assess the performance of the existing system and to predict the reliability analysis for the future. The interruption data of two years 2017-2018 G.C has been used as a base year. Different alternatives have been assessed using heuristic (trial and error) method and the alternative with low SAIDI, SAIFI and EENS with a reasonable cost has been preferred. The reliability of the Debre Berhan distribution system has been enhanced significantly by implementing reliability improvement solutions that are justified economically. Even if the uncertainty of the input data is taken into account, SAIFI has been reduced by 77.33% as compared with the average reliability indices values of the system in the base years. In the similar way SAIDI and EENS have been decreased by 80% and 77.77% respectively.
包括埃塞俄比亚在内的大多数发展中国家的配电系统对可靠性建模和评估的重视程度远远低于发电和输电系统。现在人们的日常生活直接或间接地依赖于电力,因此公用事业公司应该每天24小时,每年8760小时提供可靠的电力,以满足人们的需求,并尽可能以较少的经济完成他们的工作。本文重点研究了德勃雷-伯翰配电网的配电系统改进。对4条15kV和33kv馈线进行了可靠性评估,以评估现有系统的性能,并对未来的可靠性分析进行了预测。以2017-2018 G.C两年的中断数据为基准年。使用启发式(试错法)方法对不同的替代方案进行了评估,并优先选择具有低SAIDI, SAIFI和EENS且成本合理的替代方案。通过实施经济合理的可靠性改进解决方案,Debre Berhan配电系统的可靠性得到了显著提高。即使考虑输入数据的不确定性,与基准年系统的平均可靠度指数值相比,SAIFI也降低了77.33%。以同样的方式,SAIDI和EENS分别下降了80%和77.77%。
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引用次数: 24
Effects of the Ba Impregnation on Pt Electrode on NO Electrochemical Reduction Mechanism Ba浸渍Pt电极对NO电化学还原机理的影响
Pub Date : 2019-07-19 DOI: 10.11648/J.IJEEE.20190402.11
Xi Wang
The study investigated the electrochemical reduction performances of NO and O2 on Pt symmetric electrode with Ba adsorption layer. The temperature varied from 350°C to 550°C. The experimental Ba (NO3)2 solution was impregnated in the Pt electrode. For the NO performance, the polarization curves and CV tests showed that the Pt-BaO electrode showed higher electrochemical performance than Pt electrode. EIS results revealed that the Pt-BaO electrode exhibited higher activity than the Pt electrode. It was due to the decreased polarization resistance in the low-frequency region that dominated the electrochemical impedance spectra. The increase of temperature strengthened the effect of adsorption layer on NO electrochemical performance. The EIS results were fitted well with the equivalent circuit model indicating that the improved mechanism with the Ba adsorption layer may be related with the NO oxidation to NO2 on the Pt surface, the formation of Ba (NO3)2 in the adsorption layer and the reduction of the reaction path from the direct Ba (NO3)2 decomposition.
研究了带Ba吸附层的Pt对称电极上NO和O2的电化学还原性能。温度从350°C到550°C不等。将实验溶液Ba (NO3)2浸渍在Pt电极中。对于NO性能,极化曲线和CV测试表明,Pt- bao电极的电化学性能优于Pt电极。EIS结果表明,Pt- bao电极比Pt电极具有更高的活性。这是由于低频区极化电阻的减小在电化学阻抗谱中占主导地位。温度的升高强化了吸附层对NO电化学性能的影响。EIS结果与等效电路模型拟合较好,表明Ba吸附层的改进机制可能与Pt表面NO氧化为NO2,吸附层中Ba (NO3)2的形成以及Ba (NO3)2直接分解反应路径的减少有关。
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引用次数: 1
Impact of Economic Policy Uncertainty on Chinese Carbon Price 经济政策不确定性对中国碳价格的影响
Pub Date : 2019-03-30 DOI: 10.11648/J.IJEEE.20190401.13
Chen Ling-ling, Wang Wen-Jun
There are direct as well as indirect linkages between economic policy uncertainty and carbon market through the channels of market fundamentals. This paper theoretically analyzes the linkages between economic policy uncertainty and carbon price and empirically examines the impact of Chinese economic policy uncertainty on Hubei carbon prices. A two-regime Markov-Switching process is introduced into the VAR model to examine the impact of economic policy uncertainty during different regimes of the carbon market. The empirical results show that the two-regime Markov-Switching model applies well in modelling the return series from Hubei carbon market during April 2014 to December 2017. Under the two different regimes, although the impacts from economic policy uncertainty are both significantly positive, the magnitude of the impacts differs. The impact of Chinese economic policy uncertainty on Hubei carbon price is larger during the low volatility period on carbon market than that during the high volatility period on carbon market.
经济政策不确定性与碳市场之间通过市场基本面的渠道存在直接和间接的联系。本文从理论上分析了经济政策不确定性与碳价之间的联系,并实证考察了中国经济政策不确定性对湖北碳价的影响。在VAR模型中引入双制度马尔可夫转换过程,考察了不同制度下经济政策不确定性对碳市场的影响。实证结果表明,双区马尔可夫切换模型对2014年4月至2017年12月湖北碳市场收益序列的建模效果较好。在两种制度下,虽然经济政策不确定性的影响都是显著的正影响,但影响的程度不同。中国经济政策不确定性对湖北碳价的影响在碳市场低波动期大于碳市场高波动期。
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引用次数: 0
Assessing Factors Influencing Farmers Adoption of Improved Potato Varieties in Malawi 评估影响马拉维农民采用改良马铃薯品种的因素
Pub Date : 2019-02-28 DOI: 10.11648/J.IJEEE.20190401.11
Kapalasa Eliya, Demo Paul, Nyekanyeka Ted, Okero Julius
Cultivation of improved varieties is one way of increasing productivity of many crops especially in developing countries where there is pressure of land due to high population growth. Adoption studies have proved to be helpful in giving the picture of the performance of technologies amongst users like farmers and in line with this the study was carried out to assess the factors that influence a farmer to adopt improved potato varieties using cross-sectional data that was collected from 300 households by the International Potato Center (CIP) in 2013. The study used a Hurdle Poisson model to effectively assess the socio-economic and demographic characteristics that influence farmers to adopt improved potato varieties. The results of the study show that amongst the household socio-economic characteristics that were included in the model, age of the household head and farm size were significant at 5 percent level of significance whilst access to information through extension agents and distance to the market were the institutional factors that significantly influence a farmer. The results further show that the variety characteristics that were significant in influencing adoption of improved potato varieties included high yield, early maturity and larger tuber size that were preferred variety characteristics. Results of the decision on how many potato varieties individual farmer decides to grow shows that age of the household head, access to information and varieties that are high yielding had a significant influence. To increase adoption of recommended potato production practices, it was recommended that extension agents should be well involved in disseminating these production practices by using open field days, demonstration and control plots to encourage farmers to adopt the production practices. Secondly, the study also recommended that Government and other stakeholders need to also invest in extension service in sensitizing potato farmers in key potato production areas especially on production practices that have potential to increase level of adoption as well as farmer’s productivity and income.
种植改良品种是提高许多作物生产力的一种方法,特别是在发展中国家,由于人口的高速增长,土地压力很大。事实证明,采用研究有助于了解技术在农民等用户中的表现。与此相一致,开展了这项研究,利用国际马铃薯中心(CIP) 2013年从300个家庭收集的横截面数据,评估影响农民采用改良马铃薯品种的因素。该研究使用了一个障碍泊松模型来有效地评估影响农民采用改良马铃薯品种的社会经济和人口特征。研究结果表明,在模型中包含的家庭社会经济特征中,户主年龄和农场规模在5%的显著水平上具有显著性,而通过推广机构获取信息和与市场的距离是显著影响农民的制度因素。结果进一步表明,高产、早熟、块茎大是影响马铃薯改良品种采用的主要品种特征。决定农民个人决定种植多少马铃薯品种的结果表明,户主的年龄、获取信息的途径和高产品种具有显著影响。为了增加推荐的马铃薯生产方法的采用,建议推广人员应充分参与传播这些生产方法,利用开放田间日、示范和控制地块鼓励农民采用这些生产方法。其次,该研究还建议政府和其他利益攸关方也需要投资推广服务,使主要马铃薯产区的马铃薯农民对有可能提高采用率以及农民生产力和收入的生产实践更加敏感。
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引用次数: 5
Transition to International Energy Economic Equivalent of Future Economy 向未来经济的国际能源经济当量过渡
Pub Date : 1900-01-01 DOI: 10.11648/j.ijeee.20210605.11
E. Bryndin
Energy resources are key to the economy. Firstly, any processes in the production sector are associated with energy consumption. Energy costs permeate all areas of material production, are the most important and integral part of both core and working capital. Secondly, energy resources are currently scarce and define the limits of economic development. At present, the issues of improving energy efficiency from the sectors of the economy are given great attention. For the implementation of programs to increase economic efficiency, the development of theoretical provisions and methodological foundations of energy economic assessment of production is of great importance, There is a variation in the energy equivalents per waste of production resources offered by standards for different types of energy. Considering energy issues in economic systems, economic energy is not found in the relevant classifications, but experts consider the allocation of such a category in the theory of economic development to be timely, and this category fully meets all economic indicators. To do this, it is necessary to determine the energy equivalent for each energy source. The article assumes the calculation of energy equivalents expressed by rational numbers. The use of energy equivalents allows you to move to a single measure of energy for all types. A single measure of energy allows you to move to a single international currency for financial and economic international cooperation.
能源是经济的关键。首先,生产部门的任何过程都与能源消耗有关。能源成本渗透到材料生产的各个领域,是核心资金和营运资金中最重要和不可分割的一部分。其次,当前能源资源匮乏,制约了经济发展。目前,从经济部门提高能源效率的问题受到高度重视。为了实施提高经济效益的方案,发展生产能源经济评价的理论规定和方法基础是非常重要的。不同类型的能源标准提供的每浪费生产资源的能源当量是不同的。考虑到经济系统中的能源问题,经济能源并没有在相关的分类中找到,但专家认为在经济发展理论中分配这一类别是及时的,并且这一类别完全符合所有的经济指标。为此,有必要确定每种能源的能量当量。本文假定用有理数表示的能量当量的计算。使用能量当量可以让你对所有类型的能量采用单一的测量方法。单一的能源计量标准可以让你在国际金融和经济合作中使用单一的国际货币。
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引用次数: 1
Determination of Some Heavy Metals from Ground Water Samples Obtained from Selected Motor Parks in Kaduna, Nigeria 尼日利亚卡杜纳选定汽车停车场地下水样品中重金属的测定
Pub Date : 1900-01-01 DOI: 10.11648/j.ijeee.20210604.12
Mahmud Mohammed Imam, F. Abubakar, Z. Muhammad
: This study is aimed at ascertaining the levels of pollution of borehole and well water of selected motor parks in Kaduna, Nigeria. Borehole and well water samples from Abuja junction, Sabo garage, Television garage, Shaba modern market park, Kawo garage, Mando park were collected and analyzed for lead, cobalt, nickel and cadmium using Atomic Absorption Spectrophotometric technique. Results showed varying concentrations based on location. The results obtained were compared with WHO/NSDWQ standards. Lead was found in excessive levels above the recommended safe limit in the range of 0.04-0.07 mg/l. Nickel and cobalt were within the recommended safe limit in the range of 0.01-0.02 mg/l and 0.002-0.05 mg/l. Cadmium was found in high concentration above safe limits in the range of 0.002-0.012 mg/l. High levels of metals might be associated to the mechanical activities, high vehicle exhaust, municipal waste and other anthropogenic activities within the busy motor parks. The results indicate that most of the samples are contaminated with abnormal levels of lead and cadmium capable of causing health hazards to consumers of the water; this suggests that water found in motor parks require further treatment before consumption.
本研究的目的是确定尼日利亚卡杜纳选定的汽车停车场的井眼和井水的污染水平。采集Abuja路口、Sabo车库、Television车库、Shaba现代市场公园、Kawo车库、Mando公园的井水井水样本,采用原子吸收分光光度法分析铅、钴、镍和镉。结果显示,不同地点的浓度不同。将所得结果与WHO/NSDWQ标准进行比较。铅的含量超过了建议的安全限量0.04-0.07毫克/升。镍和钴在0.01 ~ 0.02 mg/l和0.002 ~ 0.05 mg/l的推荐安全范围内。镉含量在0.002 ~ 0.012 mg/l范围内,超出安全限值。高水平的金属可能与繁忙的汽车停车场内的机械活动、汽车尾气、城市垃圾和其他人为活动有关。结果表明,大多数样品的铅和镉含量异常,足以对饮用者的健康造成危害;这表明,在汽车停车场发现的水在饮用前需要进一步处理。
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引用次数: 0
The Impact of Resettlement Program on Livelihoods of Indigenous Community, the Case of Esira District in Dawuro Zone, SNNPRS 安置计划对土著社区生计的影响,以达乌罗地区埃西拉地区为例,SNNPRS
Pub Date : 1900-01-01 DOI: 10.11648/j.ijeee.20210603.12
Markos Mamude, Girmachew Alemu
Resettlement program is a measure taken to reduce the problems of food insecurity and household income diversification. However, improper implementations of the program have negative impact on socio-economic and environmental related issues particularly natural resource degradation which causes LU/LC change in the study area. In the context Ethiopian, resettlement has been carried out both voluntary and involuntary nature. Voluntary resettlement program occurred with the individual interest without any external influences, whereas involuntary is related with massively implemented through government policy. This study was carried out to analyze impact of resettlement program on livelihood of indigenous community in Esira district, Dawuro zone. The livelihood strategies of indigenous community before and after resettlement program where assessed using questionnaire, key informant interviews and filed observations. The finding of this study shows that, after resettlement program the indigenous community faces the problems of access to communal resource utilizations such as common grazing area and Forest, limitation of cattle number, limited annual source of income and shifting of economic activates. On other, the resettlement program brought positive impacts for indigenous community by introducing some of fruits like avocado, mango, banana and ginger which is not familiar before the resettlement program in the study area. Based on finding, it is recommended that well planned resettlement program by considering the existed indigenous community and the newly settler through mutual benefit natural resource.
安置方案是为了减少粮食不安全和家庭收入多样化问题而采取的一项措施。然而,该计划的不当实施会对社会经济和环境相关问题产生负面影响,特别是自然资源退化,从而导致研究区域的LU/LC变化。在埃塞俄比亚的情况下,重新安置既有自愿性质,也有非自愿性质。自愿安置是在没有任何外部影响的情况下,以个人利益为目的进行的,而非自愿安置则是通过政府政策大规模实施的。本研究旨在分析移民安置计划对达乌罗地区Esira区原住民社区生计的影响。通过问卷调查、关键线人访谈和实地观察,评估了安置计划前后土著社区的生计战略。研究结果表明,安置项目实施后,土著社区面临着公共牧区和森林等公共资源利用的获取、牲畜数量的限制、年收入来源的限制和经济活动的转移等问题。另一方面,安置项目引入了一些研究地区在安置项目之前不熟悉的水果,如鳄梨、芒果、香蕉、生姜等,给土著社区带来了积极的影响。在此基础上,建议通过互惠互利的自然资源,在考虑现有土著社区和新定居者的基础上,规划好安置方案。
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引用次数: 0
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International Journal of Economy, Energy and Environment
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