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| 1 | 柑橘黄龙病热处理防治技术研究进展显示文摘柑橘黄龙病正在中国、巴西和美国等地广泛传播,急需快速、有效的田间防治技术。热水和湿热空气处理对柑橘病苗和嫁接枝条有脱毒作用,在温室环境中对病苗木进行光照热疗,可以减少黄龙病病菌数量,促进其健康生长并有效延长产果寿命。该文针对柑橘黄龙病防治技术的研究现状,综述了基因改良育种、苗木脱毒、化学防治、物理防治和生物防治等方法,结合热疗法在微生物和昆虫杀灭中的广泛应用,分析了田间热处理防治技术研究中存在的主要问题,提出了研究柑橘黄龙病病菌热处理温度阈值和对应时间、建立田间黄龙病病情快速诊断和热处理防治效果评价体系、研究热处理对黄龙病病菌抑制和消杀机理以及不同传热介质在柑橘树体的传热过程和特性、建立黄龙病田间快速热处理系统、研究黄龙病综合防治方法等建议,可为进一步研究柑橘黄龙病田间防治技术提供参考。 | 贾志成 郑加强 黄雅杰 周宏平 Ehsani Reza | 2015 | 农业工程学报2015，31，23： | 21 |
| 2 | 柑桔黄龙病的可见-近红外光谱特征显示文摘柑桔黄龙病是一种以木虱为载体的细菌病原,目前还没有行之有效的治疗方法,对世界柑桔产业构成了严重的威胁。探索快速检测柑桔黄龙病的方法,对该病的诊断、评估及进一步的控制都具有重要意义。该研究采用了快速、无损的光谱方法对该病害特征进行初步探索。实验针对健康及染病植株的叶片及冠层,分别在实验室条件及田间环境下测量了其可见-近红外光谱反射率,以分析寻找二者的光谱差异。对原始光谱数据进行了平滑、聚类平均等预处理,并求取了一阶微分以确定其红边位置(red edge position,REP)。为了应对一阶微分在REP处的多个波峰现象,采用了线性外插值法及拉格朗日插值法量化REP。研究结果显示,健康及染病样本的反射率在可见光、近红外具有明显的差异。相比于健康样本,染病样本因其呈现的黄化现象,使其反射率在可见光区较高;又因黄龙病菌会明显阻碍叶片对水分的吸收而使其反射率在近红外较低。REP同样显示了潜在的区分能力,其明显随着染病程度的加深逐渐向红波段移动。在染病程度差异较大的数据集中,REP平均值相差达20nm;而在染病程度差异较小的数据集中,阈值分割法的分类精度也高达90%以上,且线性外插值法的分类精度略高于拉格朗日插值法。本研究成果为利用光谱技术快速无损检测柑桔黄龙病提供了可靠的理论依据。 | 李修华 李民赞 Won Suk Lee Reza Ehsani Ashish Ratn Mishra | 2014 | 光谱学与光谱分析2014，34，6： | 20 |
| 3 | 柑橘黄龙病蒸汽快速热处理升温特性及田间防治效果显示文摘为了深入了解柑橘黄龙病湿热蒸汽快速热处理时韧皮部的升温特性,针对柑橘黄龙病细菌位于韧皮部的特点,构建了室内和田间试验装置,主要包含加热罩、湿热蒸汽发生装置、树体表面和韧皮部温度采集装置。通过比较热处理前后韧皮部温度变化,作物恢复程度差异和黄龙病病菌浓度变化,分析获取湿热蒸汽快速热处理合理参数组合。室内试验选用1 a生柑橘树,研究了树体表面温度为55~65℃,蒸汽输送压力为0.015和0.03 MPa,不保温和保温处理30 s对于韧皮部升温和作物恢复的影响。试验结果:树体表面温度为65℃及以上时,作物都因热损而死亡,采用60℃作为热处理温度阈值,有利于韧皮部温度提高。较高的蒸汽输送压力(如0.03 MPa),虽有利于作物所在环境温度的快速升高,但其作用于韧皮部的传热时间短,韧皮部温度并没有得到有效提高,而加热后的30 s保温处理普遍有利于韧皮部温度提高。田间试验选用9 a生柑橘树,研究了树体表面温度为60℃,蒸汽输送压力为0.03 MPa,保温时间30 s的组合参数对于黄龙病病菌浓度和作物恢复的影响。试验结果:4棵染病柑橘树经过热处理,其中2棵恢复到未染病状态,2棵病菌浓度降低。2棵未经过热处理的染病柑橘树,其病菌浓度没有变化。室内和田间试验结果表明:湿热蒸汽快速热处理能有效促进染病柑橘树的生命力恢复,明显降低病菌浓度;对于柑橘黄龙病田间湿热蒸汽快速热处理,不能只关注树体表面温度的快速提高,而应关注韧皮部温度的有效提高;热处理应考虑直接蒸汽加热和关闭蒸汽后保温的综合影响,为了增加韧皮部传热,应尽量选取较高升温上限和较低输送压力。研究结果为柑橘黄龙病田间热处理防治提供参考。 | 贾志成 Ehsani Reza 郑加强 许林云 周宏平 丁锐 | 2017 | 农业工程学报2017，33，11： | 9 |
| 4 | Selection and experimental evaluation of shaking rods of canopy shaker to reduce tree damage for citrus mechanical harvesting显示文摘Canopy shaking system is one of the research hotspots for large-scale mechanized fruits harvesting.Shaking rods considered as one of the essential components of canopy shaker are responsible for transferring mechanical energy from shaking mechanism to different regions of tree canopy.This transfer depends on the characteristics of the shaking rods that directly strike the tree canopy.In order to evaluate the effects of the shaking rods on tree damage level and fruit removal percentage,three kinds of shaking rods with different materials or shapes were selected.Based on the results of bending deformation tests,it was proven that the rigid shaking rod(R_(1))with the material of Polyvinyl Chloride(PVC)did more resistance against producing bending deformation in comparison with the other two types of shaking rods with the material of Polyamide Nylon 12(PA).By contrast,the position close to the free end of the flexible shaking rod was easier to be deformed by less external force.In addition,dynamic analysis and vibration performance tests indicated that the rigid shaking rod could produce stronger vibration with higher shaking frequency of 4.8 Hz and maximum acceleration of 31.4 m/s^(2).Finally,the results of field trials indicated that the flexible bow-shaped shaking rod(R_(3))has a better widespread performance to achieve comparative higher fruit removal percentage up to 82.6%while producing lower tree damage rate of 5.36%.This study demonstrates that the materials or shapes of the shaking rod could significantly influence the fruit detachment rate and tree damage level.This study would provide an essential reference for the application of shaking rods for canopy shaker. | Yingjun Pu Arash Toudeshki Reza Ehsani Fuzeng Yang Jaafar Abdulridha | 2018 | International Journal of Agricultural and Biological Engineering2018，11，2： | 4 |
| 5 | Design and evaluation of a two-section canopy shaker with variable frequency for mechanical harvesting of citrus显示文摘Canopy shaking is one of the most commonly used techniques for mechanical harvesting of citrus fruits in orange juice industry.However,tree damage and low harvesting efficiency are the top concerns of growers in adopting the existing harvesting equipment on a large scale.The purpose of this research was to develop a novel canopy shaking system to minimize tree damage and maximize fruit removal for mechanical citrus harvesting.In this study,a two-section canopy shaker composing of top and bottom shaking systems mounted on two rotating drums was proposed and developed.It was configured with two sets of flexible bow-shaped shaking rods in a staggered distribution,which can shake the top and bottom zones of the tree canopy independently.The shaking system was designed based on a linked crank-rocker mechanism.Kinematic simulation analysis was conducted to verify the quick return characteristics and differential properties of this mechanism.Vibration test showed that the frequency of the shaking rod could be adjusted within a range of 1.1-8.8 Hz related to hydraulic motor speeds.The field tests of the shaking system with an average frequency of 4.7 Hz achieved a fruit removal percentage of 82.6%and tree damage rate of 5.4%under a tractor speed of 3 km/h.By contrast,the combined shaking frequency of 4.7 Hz&4.1 Hz of the canopy shaker produced less tree damage with a percentage of 3.9%.This study indicated that the two-section canopy shaker with an optimized frequency combination could be adaptable to the different zones of the tree canopy,and obtain lower tree damage and higher fruit removal percentage. | Yingjun Pu Arash Toudeshki Reza Ehsani Fuzeng Yang | 2018 | International Journal of Agricultural and Biological Engineering2018，11，5： | 4 |
| 6 | Strength and Ductility of Concrete Columns Externally Reinforced with Fiber Composite Straps显示文摘 | Saadatmanesh H Ehsani M R Li M W | 1994 | ACI Structural Journal1994，91，： | 1 |
| 7 | Polypetides of hepatitis B surface antigen produced in transgenic potato显示文摘 | Ehsani P Khabiri A Domansky NN | 1997 | Gene1997，190，： | 1 |
| 8 | Design recommendations for bond of GFRP rebars to concrete 显示文摘 | Ehsani M R Saadatmanesh H Tao S | 1996 | Journal of Structural Engineering1996，，3： | 1 |
| 9 | Investigation of particle size and amount of alumina on microstructure and mechanical properties of A1 matrix composite made by powder metallurgy显示文摘 | Mehdi Rahimian Nader Parvin Naser Ehsani | 2010 | Materials Science and Engineering: A2010，527，45： | 1 |
| 10 | Design recom- mendations for bond of GFRP rebar to concrete显示文摘 | Ehsani M R Saadatmanesh H Tao S | 1996 | Journal of Structural Engineering1996，122，3： | 1 |
| 11 | Investigation of the Effectiveness of Regenerative Braking for EV and HEV显示文摘 | Gao Yimin Chen Liping Ehsani Mehrdad | 1999 | SAE1999，29，10： | 1 |
| 12 | Repair of Earthquake-Damaged RC Columns with FRP Wraps 显示文摘 | Saadatmanesh H Ehsani M R Jin L M | 1997 | ACI Structural Journal1997，94，： | 1 |
| 13 | Torque ripple minimization in switched reluctance motor drives by PWM current control 显示文摘 | lqbal Husain bl Ehsani | 1996 | IEEE Trans- actions on Power Electronics1996，11，1： | 1 |
| 14 | Predic- tion of failure load of R/C beams strengthened with FRP plate due to stress concentration at the plate end 显示文摘 | Malek A M Saadatmanesh H Ehsani M R | 1998 | ACI Structural Journal1998，95，2： | 1 |
| 15 | Investigation of particle size and amount of alumina on microstructure and mechanical properties of Al matrix composite made by powder metallurgy显示文摘 | Mehdi Rahimian Nader Parvin Naser Ehsani | 2009 | Materials Science & Engineering A2009，，4： | 1 |
| 16 | Electrochemical and DFT study on the inhibition of 316L stainless steel corrosion in acidic medium by 1-(4-nitrophenyl)-5-amino-lH-tetrazole 显示文摘 | EHSANI A MAHJANI M G MOSHREFI R | 2014 | RSC Advances2014，4，20： | 1 |
| 17 | Seismic retrofit of URM walls with fiber composites 显示文摘 | Ehsani M R Saadatmanesh H | 1996 | The Masonry Society Journal1996，14，2： | 1 |
| 18 | Concrete girders externally prestressed with composite plate 显示文摘 | Char M S Saadatmanesh H Ehsani M R | 1994 | PCI Journal1994，39，3： | 1 |
| 19 | The lipid profile inpsoriasis:a controlled study显示文摘 | Akhyani M Ehsani AH Robati RM | 2007 | J Eur Acad Dermatol Venere-ol2007，21，10： | 1 |
| 20 | Speech Technology in Computer-Aided Language learning:Strengths and Limitations of a New CALL Paradigm 显示文摘 | Farzad Ehsani Eva Knodt | 1998 | Language learning&Technology1998，2，1： | 1 |
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