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Wind Potential Evaluation in El Salvador

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Journal of Energy and Power Engineering 2017年第4期11卷 225-232页

作者： tsutomu dei Hironori Hayasi Takeshi Okamura Izumi Ushiyama Division of Mechanical Engineering Renewable Energy Course Ashikaga Institute of Technology Tochigi 326-8558 Japan Environment and Energy Department Japan Weather Association Higashi-Ikebukuro3-1-1-F55 Tokyo 170-6055 Japan Water Resources & Energy Department Nippon-koei Co. Ltd. 1-14-6Kudan-kita Chiyoda-ku Tokyo 102-8539 Japan Ashikaga Institute of Technology Omae-cho 268-1 Ashikaga Tochigi 326-8558 Japan

Master plan for the Development of Renewable Energy was prepared in the Republic of El Salvador. Nationwide wind power potential map was prepared to identify the potential area for wind power development. The map indicates geographical distribution of wind potential over large regions at certain height above ground level. In this study, wind potential maps at 30 m, 50 m and 80 m above ground level were prepared respectively. Wind potential was simulated based on G1S data and global meteorological model. Data were corrected by surface wind data which had been monitored in the assessment area. As a result of wind potential analysis, wind potential areas were identified in .the southwest mountainous area, northwest mountainous area and northeast mountainous area.

关键词： Wind potential map master plan El Salvador.

Study on Seasonal Adjustment of Solar PV Tilt Angle around the North of 45th Parallel

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Journal of Energy and Power Engineering 2019年第7期13卷 267-271页

作者： Erdene Adiyasuren tsutomu dei Mongolian University of Science and Technology Ulaanbaatar 14191Mongolia Ashikaga University Ashikaga 326-8558Japan

The tilt angle of the small scale existing solar power plants is 60 degree and it is 45 degree for the megawatts(MW)class solar power plant in ***,the PV module which is installed with 45 degree accumulates lots of snow during the ***,all solar PV systems installed in Mongolia are fixed the direction and tilt *** to the previous research result,the tilt angle of those systems was not suitable for using especially in the *** PV module which is installed with 60 degree does not accumulates snow even during the autumn and *** to the National Aeronautics and Space Administration(NASA)solar radiation database,solar irradiance for equator facing is largest at 32-degree tilted angle during the summer,47-degree during the spring and autumn,at 62-degree during the *** results of this paper show,the tilt angle of the PV module should be adjusted at least twice a *** instance,the tilt angle will be adjusted at the 32-degree from 15th March to 24th August,at the 62-degree from 25th August to 15th *** this case,the annual total energy output will be increased up to 30%than present production.

关键词： PV module array tilt angle

Study on Micro-cogeneration System with Biomass Briquette in Mongolia

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Journal of Energy and Power Engineering 2020年第2期14卷 61-66页

作者： Erdene Adiyasuren tsutomu dei Mongolian University of Science and Technology Ulaanbaatar 14191Mongolia Ashikaga University Ashikaga 326-8558Japan

In Mongolia,approx.200,000 herder families are breeding the livestock for their *** half of them are not able to use the energy in proper or sustainable manner *** the herd population and number of domestic animals reach 70.0 million in *** is assumed that the power demand for a typical herder family is around 10 to 20 kWh/*** addition,there is a demand of heat for the herder families,especially in winter *** herder family moves around for the fresh grass for their ***,they need to have a portable power supply *** is an abundant biomass resource in their living *** 2.0 kW portable biomass micro-cogeneration systems were designed to supply electricity and heat to herder *** residue of the biomass in the steppe emits greenhouse gas(GHG)*** is necessary to use biomass as an energy source,especially for electricity to reduce emitting of the GHG.

关键词： Herder family portable biomass micro-cogeneration system

Study on Biomass Gasified Generator Using Rotary Engine

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Journal of Energy and Power Engineering 2021年第5期15卷 187-192页

作者： tsutomu dei Hossen Iddi Ashikaga University Ashikaga 326-8558Japan Tanzania Industrial Research and Development Organization(TIRDO) Dar es SalaamP.O.Box 23235Tanzania

The purpose of this study is to investigate the biomass gasification system for power supply to introduce in rural communities of developing *** study was conducted using biomass gasification system(20 kW)which developed at Ashikaga *** general,for small scale power supply system using biomass gasification,reciprocate type engine or modified diesel engine are attached for power ***,biomass gasifier produces tar and it causes problems on smooth movement of piston in the reciprocate *** avoid effect by tar,the system is comprised the rotary engine coupled to a generator since there is no piston inside the *** for gasification system,downdraft gasifier is designed and *** this study woody biomass was *** gasifier performance was evaluated with respect to fuel consumption *** rotary engine-generator system was evaluated in terms of power generation *** of this study shows that fuel consumption rate was about 30 kg/h,gasification efficiency was about 63.4%and efficiency of rotary engine system was about 9.4%.

关键词： Biomass gasification isolated power supply rotary engine

Study on Isolated Solar and Diesel Hybrid Power Generation System for Rural Communities

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Journal of Energy and Power Engineering 2022年第1期16卷 19-23页

作者： tsutomu dei B.Nomuulin Ashikaga University Ashikaga 326-8558Japan Mongolian University of Science and Technology Ulaanbaatar 14191Mongolia

This paper investigates performance of the small-scale power supply system using solar PV(photovoltaic)and diesel *** paper is intended as an investigation on a reliability of solar PV and DG(diesel generator)Hybrid System and the method of suppressing frequency *** the remote area or island countries,diesel generator is a common technology for supplying power and more than two thirds of the systems located in developing *** general,the price of diesel oil is expensive in remote *** reduce fuel consumption in those areas,interconnection of solar PV to the isolated diesel power grid is one of the ***,there is a problem on frequency fluctuations of energy output from the solar PV caused by changes in solar *** studies on the diesel-solar PV hybrid system were conducted using solar PV(2 kW),battery bank(24 V,420 Ah)and diesel generator(4.8 kW)and load(1,500 W)in Ashikaga *** are conducted by two different setups,a hybrid system of solar PV and DG and the hybrid with battery *** addition,the function of mechanical governor is adjusted in the *** results of the experiments show the frequency fluctuation is smallest by the hybrid system with mechanical governor and battery *** system is technically feasible to be replicated as a reliable energy source for small power demand in remote areas.

关键词： Solar PV diesel hybrid battery mechanical governor

Solution for Smart Hybrid System of Electricity and Heat Generation for the Farms in Mongolia

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Journal of Energy and Power Engineering 2021年第2期15卷 52-57页

作者： Erdene Adiyasuren tsutomu dei Sergelen Byambaa Mongolian University of Science and Technology Ulaanbaatar 14191Mongolia Ashikaga University Ashikaga 326-8558Japan

In Mongolia,the numbers of herders who own more than 1,000 herds have been increasing year by *** of the herder families are operating small agricultural factories as *** appropriate power supply systems are not being developed yet in their *** the farms,mostly 4-10 herder families work together and the monthly power consumption of one farm reaches to 11.8-14.9 ***,the gasoline,diesel,solar and wind power are being used as a source of energy *** addition,the small-scale CHP(Combined Heat and Power)system is not introduced to the farms for their sustainable *** are abundant biomass resources in the rural area of *** this paper,we conduct experimental studies on biomass gasification system and suggest small-scale CHP system for rural farms in Mongolia.

关键词： Herders wind solar biomass biogas smart hybrid system CHP

不同种植区白木香结香前后根际土壤真菌群落结构与理化因子相关性分析

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热带作物学报 2024年第5期45卷 1061-1071页

作者：李思王德立徐诗涛张梦真李慧婷中国医学科学院药用植物研究所海南分所海南海口570311 海南大学园艺学院海南海口570228 海南梨香缘农林科技有限公司海南乐东572543

通过分析不同种植地白木香结香与未结香的根际真菌种群,了解白木香结香前后根际微生物变化规律,为白木香制定合理栽培措施提供参考依据。采用高通量测序技术和生物信息学手段对海南省3个样地(海口文山、临高东光、乐东抱伦)白木香结香... 详细信息

通过分析不同种植地白木香结香与未结香的根际真菌种群,了解白木香结香前后根际微生物变化规律,为白木香制定合理栽培措施提供参考依据。采用高通量测序技术和生物信息学手段对海南省3个样地(海口文山、临高东光、乐东抱伦)白木香结香前后根际土壤和真菌的多样性及群落结构进行分析,并结合冗余分析阐明白木香结香前后土壤理化性质与真菌群落的相关性。结果表明:3个产地共获得3 697 288条ITS序列,隶属于3个种植区,共获得1界2门12纲25目42科55属62种。样地内结香前后真菌群落和多样性差异性不大,但优势种群丰度存在差异;样地间存在显著差异。白木香结香前后根际土壤真菌丰富度和多样性上从高到低依次呈现为:LDWJX>LDJX>LGJX>LGWJX>WSWJX>WSJX。白木香根际土壤样品真菌物种组成丰富,不同地区白木香根际未结香和结香后土壤真菌群落组成、分类单元的相对丰度及优势分类单元皆存在不同程度差异。在群落结构上,3个产地的优势菌群均存在差异;在门水平上,3个种植区共有的优势菌门为子囊菌门(Ascomycota)、担子菌门(Basidiomycota);在纲水平上,文山优势纲为座囊菌纲(Dothideomycetes),临高优势纲为粪壳菌纲(Sordariomycete),乐东优势纲为子囊菌纲(Ascomycetes);在属水平上,文山优势属为子囊菌属(p__Ascomycota),临高优势属为漆斑菌属(Myrothecium),乐东优势属为座囊菌属(c__Dothideomycetes)。通过对3个种植区白木香根际土壤理化性质与白木香根际真菌的主要菌属进行相关性分析发现,土壤表面pH、有机质、碱解氮、全氮、全磷、有效磷对白木香根际土壤中主要真菌群落有显著影响,表明通过调节土壤养分水平来改变白木香土壤真菌群落组成和遗传多样性。该研究结果对真菌水平上改良土壤和白木香土壤质量评价具有指导意义,也为今后海南省白木香产区的施肥策略提供参考依据。

关键词：白木香根际土壤真菌多样性理化性质相关性

助剂辅助稠油射频加热模拟实验及稠油温度影响因素

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大庆石油地质与开发 2024年第5期43卷 107-114页

作者：肖界先高德利王正旭董雪林中国石油大学(北京)石油工程教育部重点实验室北京102249 中国石油集团工程技术研究院有限公司北京102206

为了解决原始稠油储层射频加热技术存在加热距离短的技术难题,提出助剂辅助稠油射频加热技术。在介绍加热机理和工艺的基础上,设计了模拟实验系统并开展了助剂辅助稠油射频加热模拟实验并对稠油温度分布的影响因素进行了研究。结果表明... 详细信息

为了解决原始稠油储层射频加热技术存在加热距离短的技术难题,提出助剂辅助稠油射频加热技术。在介绍加热机理和工艺的基础上,设计了模拟实验系统并开展了助剂辅助稠油射频加热模拟实验并对稠油温度分布的影响因素进行了研究。结果表明:稠油样品温度随着金属镍粉末和活性炭粉末注入量的增大而升高,但金属镍粉末对稠油样品温度的影响程度较活性炭粉末更大;在助剂使用总量相同的情况下,金属镍粉末和活性炭粉末协同作用比其单独运用时稠油样品的温度更高、射频加热效果更好。研究结果对于射频加热助剂优选和提高射频加热性能提供了指导。

关键词：射频加热助剂稠油协同作用模拟实验影响因素

Endangered lowland oak forest steppe remnants keep unique bird species richness in Central Hungary

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Journal of Forestry Research 2022年第1期33卷 343-355页

作者： GáborÓnodi Zoltán Botta‑Dukát Dániel Winkler Tamás Rédei Institute of Ecology and Botany Centre for Ecological ResearchVácrátótHungary Department of Botany and Biodiversity Research University of ViennaViennaAustria Institute of Wildlife Management and Wildlife Biology University of SopronSopronHungary

The biodiversity of natural or semi-natural native,old oak woodlands have high conservation importance,especially in landscapes of monocultural forest plantations and arable *** a wider variety of microhabitats and foraging sources,such old oak forests can provide essential habitat for native forest bird *** conducted a study using bird point counts to compare the forest bird communities of old pedunculate oak(Quercus robur)remnants with native and non-native plantations in central Hungary in a landscape of mostly arable fields,settlements,and monocultural *** surveys were carried out in old oak forest remnants,middle-aged oak,white poplar(Populus alba),hybrid poplar(Populus×euramericana),black locust(Robinia pseudoacacia),and pine(Pinus spp.)*** has been carried out in nine study sites,where all six habitat types were represented(with a few exceptions),to determine total abundance,species richness,Shannon–Wiener diversity,species evenness,dominant and indicator species,and guild *** found that old oak forest remnants were the most diverse habitats among the studied forest types,while hybrid poplar and pine plantations exhibited the lowest avian *** avian guilds most sensitive to the loss of old oak forest remnants were ground foragers,bark foragers,cavity-nesters,residents,and Mediterranean migratory *** habitats were more diverse than non-native *** results suggest that it is important to conserve all remaining high biodiversity old oak stands and to avoid clear-cutting of monocultural plantations in favour of practices such as mixed-species plantations,longer rotation lengths,or retention forestry.

关键词： Forest bird community Bird conservation Old oak forest-steppe remnant Plantation forestry Forest conservation Non-native plantation