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| 1 | Current-limiting characteristics of saturated iron-core fault current limiters in VSC-HVDC systems based on electromagnetic energy conversion mechanism显示文摘A common method to examine the current-limiting performance of saturated iron-core fault current limiter(SI-FCL) in high-voltage direct-current transmission based on voltage source converter(VSC-HVDC) systems is to solve differential equations based on the system fault transient characteristics and the equivalent inductance calculation equation. This method analyzes the fault current of the VSC-HVDC system in the time domain. However, it is computationally complex and cannot directly reflect the relationship between parameters and the currentlimiting effect of the SI-FCL.In this paper,the relationship between the magnetic flux density and magnetic field energy of the SI-FCL is analyzed. The energy exchange between the DC capacitor and the SI-FCL in the DC short circuit fault process is analyzed. From the perspective of electromagnetic energy conversion, the criterion for determining the current-limiting ability of the SI-FCL in the transient process is given based on the parameters of the SI-FCL and VSC-HVDC system. On this basis, the characteristics of the DC side fault current and the capacitor voltage when the SI-FCL has current-limiting ability are examined.Based on the parameters of the SI-FCL and VSC-HVDC system, a method for calculating the fault current peak value and capacitor voltage drop time is given. Finally, the accuracy of the analysis of the SI-FCL in the VSC-HVDC system based on the electromagnetic energy conversion mechanism is demonstrated through a case study and simulation results of the VSC-HVDC system with different SI-FCLs. | Botong LI Hanqing CUI Fangjie JING Bin LI Yichao LIU | 2019 | Journal of Modern Power Systems and Clean Energy2019，7，2： | 7 |
| 2 | Eye-acupuncture as adjuvant therapy for stroke:A bibliometric analysis of clinical studies显示文摘Background:Eye-acupuncture(EA)is a fine-needle acupuncture therapy for systemic diseases.This bibliometric analysis aims to provide a comprehensive review of the characteristics of EA for ischemic or hemorrhagic apoplexy based on clinical studies.Methods:A total of 195 clinical studies from six databases such as CNKI,VIP,Wanfang Data,SinoMed,PubMed and the Cochrane Library from inception to December 31,2017 were included.Bibliometric information mainly including study type,participant characteristics,intervention and comparison details,and outcomes were extracted.Data was analyzed descriptively using SPSSsoftware to determine their distribution(range,interquartile range)and central tendency(median).Results:The studies covered 108 RCTs,36 controlled clinical trials,45 case series and 6 case reports on EA for treatment of ischemic or hemorrhagic apoplexy,involved 15466 stroke patients.EA was used at different stages of ischemic or hemorrhagic apoplexy:acute stage(n Z 38),recovery(n Z 32),sequela(n Z 13)and unclear(n Z 112).The most frequently used EA acupoints were in the upper-jiao and lower-jiao regions.The commonly used comparisons were EA alone versus traditional acupuncture,or EA plus traditional acupuncture versus traditional acupuncture.Neurological deficit scale,Modified Barthel Index,and activities of daily living were the most frequently used outcome measures.Conclusion:EA as an adjuvant therapy is effective and safe in treating stroke at acute and recovery stages,but high-quality RCTs are lacking. | Yan Shao Mei Wang Botong Liu Qianqian He Wei Deng Na Li Sirinpun Yantarat Jianping Liu | 2019 | Journal of Traditional Chinese Medical Sciences2019，6，3： | 3 |
| 3 | Application of the dividing wall column to olefin separation in fluidization methanol to propylene(FMTP) process显示文摘Dividing wall column(DWC)is shown to be energy efficient compared to conventional column sequence for multi components separation,which is used for olefin separation in fluidization methanol to propylene process in the present work.Detailed design for pilot DWC was performed and five control structures,i.e.composition control(CC),temperature control(TC),composition-temperature control(CC-TC),temperature difference control(TDC),double temperature difference control(DTDC)were proposed to circumvent feed disturbance.Sensitivity analysis and singular value decomposition(SVD)were used as criterion to select the controlled temperature locations in TC,CC-TC,TDC and DTDC control loops.The steady simulation result demonstrates that 25.7% and 30.2% duty can be saved for condenser and reboiler by substituting conventional column sequence with DWC,respectively.As for control structure selection,TC and TDC perform better than other three control schemes with smaller maximum deviation and shorter settling time. | Xiaolong Ge Botong Liu Xigang Yuan Yiqing Luo Kuo-Ksong Yu | 2017 | Chinese Journal of Chemical Engineering2017，25，8： | 1 |
| 4 | Origin of strong and narrow localized surface plasmon resonance of copper nanocubes显示文摘Inexpe nsive copper nano particles are generally thought to possess weak and broad localized surface plasm on resonance(LSPR).The,present experimental and theoretical studies show that tailoring the Cu nanoparticle to a cubic shape results in a single intense,narrow,and asymmetric LSPR line shape,which is even superior to round-shaped gold nanoparticles.In this study,the dielectric function of copper is decomposed into an interband transition component and a free-electron component.This allows interband transition-induced plasmon damping to be visualized both spectrally and by surface polarization charges.The results reveal that the LSPR of Cu nanocubes originates from the comer mode as it is spectrally separated from the interb and transitions.In additi on,the interband tran sitions lead to severe damping of the local electromagnetic field but the cubic corner LSPR mode survives.Cu nanocubes display an extinction coefficient comparable to the dipole mode of a gold nanosphere with the same volume and show a larger local electromagnetic field enhancement These results will guider-development of in expensive plasmonic copper-based nano materials. | Peng Zheng Haibin Tang Botong Liu Sujan Kasani Ling Huang Nianqiang Wu | 2019 | Nano Research2019，12，1： | 1 |
| 5 | Thirteen Dipterocarpoideae genomes provide insights into their evolution and borneol biosynthesis显示文摘Dipterocarpoideae,the largest subfamily of the Dipterocarpaceae,is a dominant component of Southeast Asian rainforests and is widely used as a source of wood,damar resin,medicine,and essential oil.However,many Dipterocarpoideae species are currently on the IUCN Red List owing to severe degradation of their habitats under global climate change and human disturbance.Genetic information regarding these taxa has only recently been reported with the sequencing of four Dipterocarp genomes,providing clues to the function and evolution of these species.Here,we report on 13 high-quality Dipterocarpoideae genome assemblies,ranging in size from 302.6 to 494.8 Mb and representing the five most species-rich genera in Dipterocarpoideae.Molecular dating analyses support the Western Gondwanaland origin of Dipterocarpaceae.Based on evolutionary analysis,we propose a three-step chromosome evolution scenario to describe the karyotypic evolution from an ancestor with six chromosomes to present-day species with 11 and 7 chromosomes.We discovered an expansion of genes encoding cellulose synthase(CesA),which is essential for cellulose biosynthesis and secondary cell-wall formation.We functionally identified five bornyl diphosphate synthase(BPPS)genes,which specifically catalyze the biosynthesis of borneol,a natural medicinal compound extracted from damar resin and oils,thus providing a basis for large-scale production of natural borneol in vitro. | Zunzhe Tian Peng Zeng Xiaoyun Lu Tinggan Zhou Yuwei Han Yingmei Peng Yunxue Xiao Botong Zhou Xue Liu Yongting Zhang Yang Yu Qiong Li Hang Zong Feining Zhang Huifeng Jiang Juan He Jing Cai | 2022 | Plant Communications2022，3，6： | 1 |
| 6 | Investigation of the operability for four-product dividing wall column with two partition walls显示文摘For separating some specific four component mixtures into four products, the four-product dividing wall column(FPDWC) with two partition walls can provide the same utility consumption with the extended Petlyuk configuration, although with structure simplicity. However, the reluctance to implement this kind of four product dividing wall column industrially also consists in the two uncontrollable vapor splits associated with it. The vapor split ratios are set at the design stage and might not be the optimal value for changed feed composition, thus minimum energy consumption could not be ensured. In the present work, a sequential iterative optimization approach was initially employed to determine the parameters of cost-effective FPDWC. Then the effect of maintaining the vapor split ratios at their nominal value on the energy penalty was investigated for the FPDWC with two partition walls, in case of feed composition disturbance. The result shows that no more than + 2% above the optimal energy requirements could be ensured for 20% feed composition disturbances, which is encouraging for industrial implementation. | Xiaolong Ge Botong Liu Botan Liu Hongxing Wang Xigang Yuan | 2018 | Chinese Journal of Chemical Engineering2018，26，8： | 0 |
| 7 | On the process of filtration of fractional viscoelastic liquid food显示文摘In the process of filtration,fluid impurities precipitate/accumulate;this results in an uneven inner wall of the filter,consequently leading to non-uniform suction/injection.The Riemannian-Liouville fractional derivative model is used to investigate viscoelastic incompressible liquid food flowing through a permeable plate and to generalize Fick's law.Moreover,we consider steady-state mass balance during ultrafiltration on a plate surface,and a fractional-order concentration boundary condition is established,thereby rendering the problem real and complex.The governing equation is numerically solved using the finite difference algorithm.The effects of the fractional constitutive models,generalized Reynolds number,generalized Schmidt number,and permeability parameter on the velocity and concentration fields are compared.The results show that an increase in fractional-orderαin the momentum equation leads to a decrease in the horizontal velocity.Anomalous diffusion described by the fractional derivative model weakens the mass transfer;therefore,the concentration decreases with increasing fractional derivativeγin the concentration equation. | Yahui Meng Botong Li Xinhui Si Xuehui Chen Fawang Liu | 2021 | Communications in Theoretical Physics2021，73，4： | 0 |
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