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| 1 | Overview of advances in improving uniformity and water use efficiency of sprinkler irrigation显示文摘Water is the scarcest resource and the importance of the judicious use of water in the agricultural sector for sustaining agricultural growth and the retardation of environmental degradation needs no further elaboration.The successes of using sprinkler irrigation to develop new lands,point the way forward to a much greater role for the development of future land reclamation projects.Water use efficiency through a proper improvement of water management techniques and other production factors are essential to boost on-farm productivity.Various factors affecting uniformity and water use efficiency in sprinkler irrigation have been outlined in this research,highlighting possible ways to improve such essential parameters in crop production.The study emphasizes on an irrigation system that works adequately in applying water to stay within the root zone,making the water always available in sufficient quantities to meet the crop water needs.It suggests practical ways of managing irrigation systems within tolerable limits not neglecting the effects of wind which is a major contributing factor to non uniformity in sprinkler irrigation. | Ransford Opoku Darko Yuan Shouqi Liu Junping Yan Haofang Zhu Xingye | 2017 | International Journal of Agricultural and Biological Engineering2017，10，2： | 8 |
| 2 | 城市化对趵突泉泉域降水入渗补给的影响显示文摘为研究济南城市化发展对大气降水入渗补给的影响,利用济南市1980、1990、2000、2018年的遥感数据和Feflow软件识别不同时段的趵突泉泉域大气降水入渗补给量,分析城市化发展引起的土地利用类型变化对趵突泉泉域降水入渗补给量的影响。结果表明:1980-2018年,研究区耕地和林地面积显著减少,建设用地面积大幅增加;2000-2018年,研究区不透水面积增加了213.13km^2,大气降水入渗补给量减少了2625万m^3。研究成果可为济南市未来的城区规划提供科学的参考,也为济南保泉供水工作提供有效的数据支撑。 | 倪寒茜 束龙仓 韩刚 张曼琦 王鑫 王小博 余亚飞 OPOKU Portia Annabelle | 2020 | 南水北调与水利科技(中英文)2020，18，6： | 5 |
| 3 | 梯牧草草捆压缩蠕变特性的影响因素分析显示文摘蠕变是决定纤维状生物质压缩的一个重要特性,不同的蠕变特性影响压缩过程的能耗.为分析出最佳原料匹配参数,达到降低压缩能耗的目的,采用Burger模型,分析了在不同含水率和切段处理条件下梯牧草的压缩蠕变特性.非线性回归分析显示,Burger模型适用于梯牧草草捆的压缩蠕变过程;试验结果表明含水率对蠕变特性产生较大影响,切段在一定程度上影响蠕变;通过统计学中的主成分分析,将影响蠕变特性的因子分为弹性因子和粘性因子,这两个因子包含了蠕变特性中86.45%的信息;较高含水率条件下不论是否切段,梯牧草的弹性和粘性均较弱.由此得出,在较高含水率条件下时,梯牧草压缩所需能耗应较低. | 王光辉 王德成 TabilL G Opoku A | 2011 | 江苏大学学报(自然科学版)2011，32，1： | 4 |
| 4 | Pelleting characteristics of selected biomass with and without steam explosion pretreatment显示文摘Processing and densification of agricultural biomass into high density and durable pellets are critical to facilitate handling,storage and transportation.Biomass pelleting experiments were designed to conduct single and pilot scale pelleting of non-treated and steam exploded barley,canola,oat and wheat straw grinds acquired from 6.4,3.2,1.6 and 0.8 mm hammer mill screen sizes at 10%moisture content(wb).Single-pelleting was performed by applying compression pressures of 31.6,63.2,94.7,and 138.9 MPa using a close-fit plunger die assembly(die length 135.3 mm and diameter of(6.30±0.5)mm).During pilot scale pelleting,customization of ground straw material was performed by adding steam exploded biomass in increments of 25%to non-treated ground straw for respective biomass at specific grind size.Ground straw samples were conditioned to 17.5%moisture content and 10%flaxseed oil was added to increase the bulk density and flowability of grinds,which resulted in the production of pellets.The quality of pellets from single pelleting experiments was ascertained by measuring their respective density and durability.In addition,the change in pellet density was measured after a storage period of one month to determine its dimensional stability.It was determined that applied pressure and pre-treatment were significant factors affecting the pellet density.Also,bigger grind sizes and lower applied pressures resulted in higher pellet relaxations(lower pellet densities)during storage of pellets.The pilot scale pellet mill produced pellets from ground non-treated straw at hammer mill screen sizes of 0.8 and 1.6 mm and customized samples having 25%steam exploded straw at 0.8 mm.It was observed that the pellet bulk density and particle density are positively correlated.The density and durability of agricultural straw pellets significantly increased with decrease in hammer mill screen size from 1.6 mm to 0.8 mm.Customization of agricultural straw by adding 25%of steam exploded straw by weight is possible,but it did not improve pellet quality.In addition,durability of pellets was negatively correlated to pellet mill throughput and was positively correlated to specific energy consumption. | Phani Adapa Lope Tabil Greg Schoenau Anthony Opoku | 2010 | International Journal of Agricultural and Biological Engineering2010，3，3： | 4 |
| 5 | 粘壤麦茬玉米免耕制的变化显示文摘粘壤地小麦后茬玉米免耕制常使其产量降低,已成为在Ontario地区减少运用免耕制的一个主要因素。本文目的是确定粘壤地小麦后茬玉米在保持耕作和小麦残茬管理方面对其出苗、生长和产量有益的条件。1994和1995年在Ontario两个地点评价了7种耕作与残茬管理体系(秋翻耕、深松耕、串列式耙茬、带状耕作、免耕裸地、免耕秸秆打捆与不打捆覆盖)。秋季带状耕作减少了土壤表面小麦残茬量。晚秋留在带状耕作、免耕打捆和不打捆覆盖地上的小麦残茬量分别为3.1、4.0和7.1Mg/hm2。秋耕处理15cm土层早春含水量没有差异,但都低于免耕麦秆覆盖处理。采用秋季带状或秋耙改变的免耕制与秋翻耕或秋深松耕处理的玉米产量没有差异,都比免耕麦秆覆盖处理增产5%~10%。免耕的产量潜势受到小麦残茬量的影响。全部去掉小麦残茬要比免耕麦草打捆和不打捆覆盖的玉米产量增加0.5Mg/hm2和0.9Mg/hm2。免耕打捆和不打捆覆盖处理20cm土层的微团粒比例最少,透性抗性最大,玉米生长最慢,产量最低。本文推荐在粘壤地上小麦茬后种植玉米采用秋季带状耕作或串列式耙地。 | George Opoku 杨健 | 1998 | 麦类作物1998，18，2： | 2 |
| 6 | Determination of crop and soil evaporation coefficients for estimating evapotranspiration in a paddy field显示文摘Accurate estimation of evapotranspiration is important in efficient water management for improving water use efficiency.In order to obtain evapotranspiration and evaporation beneath the canopy using the Food and Agriculture Organization(FAO)method,pan evaporation was used instead of reference evapotranspiration calculated by the Penman-Monteith equation with detailed meteorological data.The total crop coefficient and soil evaporation coefficient were determined using actual measured daytime evapotranspiration and evaporation by the Bowen ratio energy balance and lysimeter,respectively,in a rice paddy field in Japan.The average evapotranspiration was 5.3 mm/d,4.4 mm/d,7.4 mm/d and 6.3 mm/d and crop coefficient was 0.79,1.18,1.01 and 0.86 for the initial stage,development stage,middle-season stage and late-season stage,respectively.The evaporation was low and almost constant with an average value around 0.77 mm/d when the leaf area index(LAI)reached 3.The proposed average crop coefficients for different growing stages were applied to estimate daytime evapotranspiration and found suitable.A simple soil water evaporation coefficient model was developed using leaf area index for practical use and it was found that it could accurately estimate evaporation. | Yan Haofang Zhang Chuan Hiroki Oue Peng Guangjie Ransford Opoku Darko | 2017 | International Journal of Agricultural and Biological Engineering2017，10，4： | 2 |
| 7 | Optimization of movable irrigation system and performance assessment of distribution uniformity under varying conditions显示文摘The evaluation of the performance of distribution uniformity by linearly moved irrigation system(LMIS)should consider the impacts of non uniformity of the water on crop yield.With increasing pressures to improve water use efficiency,plant productivity and farm profitability,questions continue to be raised concerning the future direction of irrigated agriculture.This study therefore aimed at evaluating water distribution under LMIS newly designed by the National Research Centre of Fluid Machinery Engineering and Technology,Jiangsu University,China.This article reports the real distribution of irrigation water under the LMIS with respect to sprinkler height above the ground surface as well as the consequence of different operating pressures.Water distribution coefficients used in the performance assessment were Christiansen’s coefficient of uniformity(CU),distribution uniformity(DU),scheduling coefficients(Sc)and the coefficient of variation(CV).The results showed that the mean CU ranged from 82.30%to 93.17%,and mean DU ranged from 70.39%to 88.44%.Also Sc values ranged from 1.13 to 1.42 with CV values ranging from 10.3%to 22.5%.The optimum method and results in this study can provide a reference to the operations for saving water and cost in the application of LMIS. | Yuan Shouqi Ransford Opoku Darko Zhu Xingye Liu Junping Tian Kun | 2017 | International Journal of Agricultural and Biological Engineering2017，10，1： | 2 |
| 8 | Preliminary screening of some traditional zulu medicinal plants for anti- inflammatory and anti-microbial activities显示文摘 | LIN J OPOKU A R GEHEEB-KELLER M | 1999 | Journal of Ethnopharmacology1999，68，11213： | 1 |
| 9 | Mechanisms of resistance of Porphyromonas gingivalis to killing by serum complement显示文摘 | Slaney JM Gallagher A Aduse Opoku J | 2006 | Infect Immune2006，74，9： | 1 |
| 10 | Chemical Composition and Larvicidal Activity of the Essential Oil of Tarchonanthus camphoratus Against Anopheles arabiensis Mosquito Larvae显示文摘 | SarahK. Nanyonga Andy Opoku FrancisB. Lewu AdebolaO. Oyedeji | 2012 | Journal of Essential Oil Bearing Plants2012，，2： | 1 |
| 11 | Antioxidative effects of pumpkin seed (Cucurbita pepo) protein isolate in CCI4- induced liver injury in low-protein fed rats显示文摘 | Nkosi C Z Opoku A R Terblanche S E | 2006 | Phytother Res2006，20，11： | 1 |
| 12 | Trends in forensic DNA database:transnational exchange of DNA data显示文摘The transnational exchange of forensic DNA data has become a modern trend in fighting cross-border crime,terrorism and illegal immigration.Forensic DNA data allow the police to identify,eliminate or link individuals associated with a crime.Additionally,different crime scenes can be linked via the DNA profile to identify serial offenders or determine crime pat-terns.Approaches to the transnational exchange of DNA data can be categorized into four:(1)creation of an international DNA database,(2)linked or networked national DNA data-bases,(3)request-based exchange of data,and(4)a combination of these.Most countries operate the combination system of data exchange.This paper briefly introduces the different approaches in the transnational sharing of forensic DNA data,the legislative and operational framework,pattern of data exchange and participating states,and policy challenges associ-ated with data sharing.Generally,most DNA exchange systems are modelled as the European Union Prüm regime.This operates under two stages:hit/no-hit query and further information sharing.The scope of the data exchange is governed by individual national legislation that determines the type of information that can be shared and the national authority responsible for the system.Though DNA data exchange has been instrumental in resolving serious crimes such as gang and serial rape,and armed robbery,adequate infor-mation about their overall effectiveness and efficiency is lacking.Further,operational,legal and ethical challenges including issues of privacy and proportionality appear to limit the full potential of the DNA data exchange system. | Aaron Opoku Amankwaa | 2020 | Forensic Sciences Research2020，5，1： | 1 |
| 13 | Evaluation and management of the pediatric thyroid nodule 显示文摘 | Guille JT Opoku - Boateng A Thiheault SL | 2015 | Oneologist2015，，： | 1 |
| 14 | What I say about myself: communication of brand personality by African countries显示文摘 | Pitt L F Opoku R Hultman M | 2007 | Tourism Management2007，28，3： | 1 |
| 15 | Mapping destination personality in cyberspace:An evaluation of country web sites using correspondence analysis显示文摘 | Opoku R A | 2009 | Journal of Internet Commerce2009，8，12： | 1 |
| 16 | Antioxidative effects of pumpkin seed ( Cucurbita pepo) protein isolate in CC14 - induced liver injury in low - protein fed rats 显示文摘 | Nkosi C Z Opoku A R Terblanche S E | 2006 | Phytother Res2006，20，11： | 1 |
| 17 | Analysis of indoor set-point temperature of split-type ACs on thermal comfort and energy savings for office buildings in hot-humid climates显示文摘In hot-humid climates,particularly in sub-Saharan Africa(SSA),ambient temperatures and relative humidity are as high as 35°C and 84%,respectively,requiring the use of mechanical cooling systems for indoor thermal comfort.Split-type vapor-compression air-conditioners(SVAC)are mainly used for space cooling in SSA and consume 60-80%of total energy consumption in commercial and public buildings.Appropriate control strategy of the indoor set-point temperature of SVAC can result in significant energy savings in these buildings.In this study,modeling and dynamic simulation have been conducted using EnergyPlus to predict the energy saving potential and indoor thermal comfort of buildings in hot-humid climates by controlling set-point temperature of the SVAC.In a case study,climatic data for Ghana,was used to predict the energy saving potential and indoor thermal comfort.The study results revealed that,to ensure indoor thermal comfort at high outdoor temperature condition of 35°C,the least and optimum set-point temperatures of the SVAC should be 21°C and 25°C,respectively.On the other hand,for low outdoor temperature condition,the least and optimum set-point temperatures were 22°C and 26°C,respectively.Considering 1-star and 2-star rated SVACs which are dominantly used in Ghana,operating at 21-25°C in the case of high outdoor conditions,and 22-26°C for low outdoor conditions relative to the least temperatures resulted in energy savings of 8-33%and 12-44%,respectively. | KofiOwura Amoabeng Richard Opoku Samuel Boahen George Yaw Obeng | 2023 | Energy and Built Environment2023，4，3： | 1 |
| 18 | Wheat straw placement effects on total phenolic compounds in soil and corn seedling growth显示文摘 | Opoku G Vyn T J Voroney R P | 1997 | Canadian Journal of Plant Science1997，77，3： | 1 |
| 19 | Antioxidative effects of pumpkin seed (Cucurbitapepo) protein isolate in CC14-induced liver injury in low-protein fed rats显示文摘 | NKOSI C Z OPOKU A R TERBLANCHE S E | 2006 | Phytother Res2006，20，11： | 1 |
| 20 | Prophylactic Antibiotic during Caesarean Sections at Komfo Anokye Teaching Hospital, Kumasi显示文摘 | BK Opoku | 2007 | Ghana Med J2007，41，2： | 1 |
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