Alkaline stress has serious-negative effects on citrus production.Ziyang xiangcheng(Citrus junos Sieb.ex Tanaka)(Cj)is a rootstock that is tolerant to alkaline stress and iron deficiency.Trifoliate orange(Poncirus tri...Alkaline stress has serious-negative effects on citrus production.Ziyang xiangcheng(Citrus junos Sieb.ex Tanaka)(Cj)is a rootstock that is tolerant to alkaline stress and iron deficiency.Trifoliate orange(Poncirus trifoliata(L.)Raf.)(Pt),the most widely used rootstock in China,is sensitive to alkaline stress.To investigate the molecular mechanism underlying the tolerance of Cj to alkaline stress,next-generation sequencing was employed to profile the root transcriptomes and small RNAs of Cj and Pt seedlings that were cultured in nutrient solutions along a three pH gradient.This two-level regulation data set provides a system-level view of molecular events with a precise resolution.The data suggest that the auxin pathway may play a central role in the inhibitory effect of alkaline stress on root growth and that the regulation of auxin homeostasis under alkaline stress is important for the adaptation of citrus to alkaline stress.Moreover,the jasmonate(JA)pathway exhibits the opposite response to alkaline stress in Cj and Pt and may contribute to the differences in the alkaline stress tolerance and iron acquisition between Cj and Pt.The dataset provides a wealth of genomic resources and new clues to further study the mechanisms underlying alkaline stress resistance in Cj.展开更多
To reduce the torque ripple in motors resulting from the use of conventional direct torque control(DTC),a model predictive control(MPC)-based DTC strategy for a direct matrix converter-fed induction motor is proposed ...To reduce the torque ripple in motors resulting from the use of conventional direct torque control(DTC),a model predictive control(MPC)-based DTC strategy for a direct matrix converter-fed induction motor is proposed in this paper.Two new look-up tables are proposed,these are derived on the basis of the control of the electromagnetic torque and stator flux using all the feasible voltage vectors and their associated switching states.Finite control set model predictive control(FCS-MPC)has then been adopted to select the optimal switching state that minimizes the cost function related to the electromagnetic torque.Finally,the experimental results are shown to verify the reduced torque ripple performance of the proposed MPC-based DTC method.展开更多
This letter presents a systematic approach to estimate the annual energy production(AEP) of variable-speed wind turbines erected at high-altitude sites. Compared with the existing empirical-model based approaches, the...This letter presents a systematic approach to estimate the annual energy production(AEP) of variable-speed wind turbines erected at high-altitude sites. Compared with the existing empirical-model based approaches, the proposed approach models the influence of the air density on the power production while employing the theoretical power curve. Consequently, the proposed approach provides a precise estimation of AEP, which can serve as a foundation of the optimum turbinesite matching design at different-altitude sites.展开更多
In this study, etherification of ginkgolide B and dimethylaminoethyl chloride hydrochloride was investigated as a model reaction in a micro-flow system （MFS）, providing the resulting ethers in high yield with fewer ...In this study, etherification of ginkgolide B and dimethylaminoethyl chloride hydrochloride was investigated as a model reaction in a micro-flow system （MFS）, providing the resulting ethers in high yield with fewer side effects. Meanwhile, this novel process in MFS worked well for other ginkgolides from Ginkgol biloba and halides, giving moderate yields.展开更多
基金supported by the National Modern Citrus Industry System(CARS-26)NSFC(Natural Science Foundation of China)(31601729),NSFC(31521092)the China Postdoctoral Science Foundation(2015M582242).
文摘Alkaline stress has serious-negative effects on citrus production.Ziyang xiangcheng(Citrus junos Sieb.ex Tanaka)(Cj)is a rootstock that is tolerant to alkaline stress and iron deficiency.Trifoliate orange(Poncirus trifoliata(L.)Raf.)(Pt),the most widely used rootstock in China,is sensitive to alkaline stress.To investigate the molecular mechanism underlying the tolerance of Cj to alkaline stress,next-generation sequencing was employed to profile the root transcriptomes and small RNAs of Cj and Pt seedlings that were cultured in nutrient solutions along a three pH gradient.This two-level regulation data set provides a system-level view of molecular events with a precise resolution.The data suggest that the auxin pathway may play a central role in the inhibitory effect of alkaline stress on root growth and that the regulation of auxin homeostasis under alkaline stress is important for the adaptation of citrus to alkaline stress.Moreover,the jasmonate(JA)pathway exhibits the opposite response to alkaline stress in Cj and Pt and may contribute to the differences in the alkaline stress tolerance and iron acquisition between Cj and Pt.The dataset provides a wealth of genomic resources and new clues to further study the mechanisms underlying alkaline stress resistance in Cj.
基金This work was supported in part by the Hunan Provincial Key Laboratory of Power Electronics Equipment and Grid under Grant 2018TP1001in part by the National Natural Science Foundation of China under Grant 61903382,51807206,61933011+1 种基金in part by the Major Project of Changzhutan Self-Dependent Innovation Demonstration Area under Grant 2018XK2002in part by the Natural Science Foundation of Hunan Province,China under Grant 2020JJ5722 and 2020JJ5753.
文摘To reduce the torque ripple in motors resulting from the use of conventional direct torque control(DTC),a model predictive control(MPC)-based DTC strategy for a direct matrix converter-fed induction motor is proposed in this paper.Two new look-up tables are proposed,these are derived on the basis of the control of the electromagnetic torque and stator flux using all the feasible voltage vectors and their associated switching states.Finite control set model predictive control(FCS-MPC)has then been adopted to select the optimal switching state that minimizes the cost function related to the electromagnetic torque.Finally,the experimental results are shown to verify the reduced torque ripple performance of the proposed MPC-based DTC method.
基金This work was supported by the National Natural Science Foundation of China(No.61803393)the Natural Science Foundation of Hunan Province(No.2020JJ4751)the Basic Science Research Program through the National Research Foundation(NRF)of Korea funded by the Ministry of Education(No.NRF-2016R1A6A1A03013567).
文摘This letter presents a systematic approach to estimate the annual energy production(AEP) of variable-speed wind turbines erected at high-altitude sites. Compared with the existing empirical-model based approaches, the proposed approach models the influence of the air density on the power production while employing the theoretical power curve. Consequently, the proposed approach provides a precise estimation of AEP, which can serve as a foundation of the optimum turbinesite matching design at different-altitude sites.
基金financially supported by the National Key Basic Research Program of China(973 Program,Nos.2012CB725204 and 2012CB721104)the National Natural Science Foundation of China(Nos.U1463201,81302632,21522604 and21402240)+1 种基金the youth in Jiangsu Province Natural Science Fund(No.BK20130913)National Science and Technology Major Projects for"Major New Drugs Innovation and Development"(No.2013ZX09103001-004)
文摘In this study, etherification of ginkgolide B and dimethylaminoethyl chloride hydrochloride was investigated as a model reaction in a micro-flow system （MFS）, providing the resulting ethers in high yield with fewer side effects. Meanwhile, this novel process in MFS worked well for other ginkgolides from Ginkgol biloba and halides, giving moderate yields.
