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Bounce-averaged gyrokinetic simulation of trapped electron turbulence in elongated tokamak plasmas
Qi, Lei,Kwon, Jae-Min,Hahm, T.S.,Yi, Sumin IOP 2017 Nuclear fusion. Fusion nucléaire. &n.Illiga Vol.57 No.12
<P>Plasma elongation effects on turbulence and zonal flow are explicitly investigated for the first time with global bounce-averaged gyrokinetic simulations for a collisionless trapped electron mode (CTEM). As the most efficient steady state turbulence simulation scheme for this problem, bounce-averaged gyrokinetic simulation provides deeper insights into nonlinear physics separated from the linear effects in the investigation. Based on studies for a limited range of parameters, our results show that shorter radial scale zonal flows which are prominent for CTEM are more enhanced with higher elongation leading to reduced transport. According to the single time radial correlation function, potential fluctuation exhibits two radial characteristic scales similar to previous gyrokinetic simulation and experimental measurements. A dual mode propagating in counter directions is observed with a stronger sheared zonal flow for higher elongation.</P>
Lei Qi,Ruibin Guo,Zunli Mo,Qijun Wu 한국탄소학회 2018 Carbon Letters Vol.25 No.-
Large-size graphene samples are successfully prepared by combining ultrosonic assisted liquid phase exfoliation process with oxidation-deoxidation method. Different from previous works, we used an ultrasound-treated expanded graphite as the raw material and prepared the graphene via a facile oxidation-reduction reaction. Results of X-ray diffraction and Raman spectroscopy confirm the crystal structure of the as-prepared graphene. Scanning electron microscopy images show that this kind of graphene has a large size (with a diameter over 100 μm), larger than the graphene from graphite powder and flake graphite prepared through single oxidation-deoxidation method. Transmission electron microscopy results also reveal the thin layers of the prepared graphene (number of layers ≤3). Furthermore, the importance of preprocessing the raw materials is also proven. Therefore, this method is an attractive way for preparing graphene with large size.
Process Sequence Planning Modeling Based on Polychromatic Sets
Lei Qi,Li Xian-wang,Guo Wei-fei,Li Xiao-xin 보안공학연구지원센터 2016 International Journal of Grid and Distributed Comp Vol.9 No.9
In view of the existing sequence planning problem, this paper presents a process scheduling model based on polychromatic sets theory. To attain the similarity and individuality of constraints of parts, the process route decision was divided into stages. A feature machining chain and process feature ranking model were built beginning with the factors that influence the processing stage and technology feature. The adoption of polychromatic sets theory simplifies the evaluation of process constraints; thus, knowledge can be expressed easily. This method not only ensures the versatility of the system, but also satisfies the customer-oriented process resource.
Lei Qi,Xuansheng Cheng,Shanglong Zhang,Xinhai Zhou 대한토목학회 2023 KSCE Journal of Civil Engineering Vol.27 No.3
To study the seismic failure mechanism of Plate-Shell Integrated Concrete Liquid Storage Structure (PSICLSS), the mechanical properties of each component under earthquake are studied. The influences of excitation frequency and amplitude on seismic responses of PSICLSS are analyzed. Based on the alternate load path method, the influences of partial component failure on the seismic responses of PSICLSS are studied, and the effects of free surface and structure size on seismic responses of PSICLSS are studied. Results show that the upper connection beams, upper plate and upper shell are easily tension failure. The effect of external liquid sloshing on the seismic response of the structure is more significant. The upper beams have a more significant influence on the structural seismic response. Considering the liquid free surface will cause structural stress increases. With the increase of the structural size, the structural stress, displacement and hydraulic pressure all increase, but the liquid sloshing height does not increase as the structural size increases.
Qi-Hua You,Jinhai Shen,Ganping Shen,Liyun Peng,Yuanqin Lu,Qi Fu,Yuqing Xu,Lei Zhang 대한화학회 2018 Bulletin of the Korean Chemical Society Vol.39 No.3
Here, we report a highly water-soluble colorimetric and fluorescent pH probe that works in the pH range 0.2–3.0. The probe showed a rapid response, high stability, and excellent reversibility to acidity. Moreover, the fluorescence of probe was not influenced by the existence of high concentration of cations. The pKa of probe was calculated to be 2.25 ± 0.06. Furthermore, the pH test papers coated with the probe exhibited a distinct color change in acidic conditions.
Research on Large‑scale Photovoltaic Planning Based on Risk Assessment in Distribution Network
Lei Wang,Minyu Yuan,Fan Zhang,Xuli Wang,Jing Ma,Lei Dai,Xianjun Qi,Rui Bi 대한전기학회 2020 Journal of Electrical Engineering & Technology Vol.15 No.3
Risks caused by large amounts of distributed photovoltaic (PV) feeding into distribution networks, have an impact on PV planning, which has become a critical consideration for distribution networks’ operation. In this paper, a large-scale PV planning method is proposed which based on risk assessment in distribution networks. Cluster division is used to group large-scale distributed PVs. A risk assessment is performed on the distribution network, considering the correlation between PVs and loads. The efects of load fuctuations, PV quantity, capacity and location on the operational risk of the distribution network are analyzed and discussed. A large-scale PV planning model is established with the goal of maximizing the comprehensive benefts, considering the penalty cost of node voltage over-limit and branch power fow over-limit risk. Finally, the genetic algorithm is used to solve the planning model. The simulation results demonstrate the efectiveness of the proposed method.
Lei Qi-long,Yang Xing-ke,Nie Rui-e 한국응용곤충학회 2020 Journal of Asia-Pacific Entomology Vol.23 No.2
In this study, a species catalogue of Sermyloides, including 42 species, is given. Two new species are described: Sermyloides wuyiensis sp. nov. from Fujian, China and Sermyloides bipunctatus sp. nov. from Chongqing, China. A key to species, photographs of aedeagus, habitus of new species and habitus of 14 species of Chinese holotypes are provided.
Qi‑Lei Dai,Kun Li,Kai‑Ren Meng,Zhou Fang,Wen Chen,Tian‑Bao Yang,Chi Feng,Jin‑Ming Wu,R. D. K. Misra 대한금속·재료학회 2023 METALS AND MATERIALS International Vol.29 No.4
Advanced automotive industries generate large demand for the next generation of high strength and high toughness springsteels. Vanadium-containing 55SiCrV spring steels subjected to rapid-induction heating treatment can fulfil such requirements. However, the effect of vanadium microalloying under online rapid-induction heat treatments is rarely reported. Acomparative study of the microstructure and tensile properties of 55SiCr and 55SiCrV spring steel wires subjected to a novelonline rapid induction heat treatment has been demonstrated herein. It is found that the tensile strength of the 55SiCr springwire decreases with the decrease in the wire speed in online rapid-induction heating, and the plasticity increases. Whereas,the tensile strength of the 55SiCrV steel wire increases with the decrease in the wire speed with the retained high plasticity,which is attributed to the strengthening effect of the dislocations. Through the optimized rapid-induction heating/coolingthermal cycles and intermediate-temperature tempering treatment, the tensile strength of the 55SiCrV steel wire approaches2106 MPa with total elongation of 9.7%. Compared with the 55SiCr spring steel, the addition of V in 55SiCrV spring steelchanges the strengthening and toughening mechanisms via the grain refinement and enhancement in the hardenability andtempering resistance. The finely dispersed V-containing secondary phases are rarely found in the matrix, which indicates thatthe precipitation effect stemming from the addition of V is not the dominant strengthening factor in the online rapid-inductionheat process. The proposed novel online rapid-induction heat treatment provides a promising pathway for the mechanicalproperty improvement of the spring steel.
Effect of humidity on mechanical properties of dissolving microneedles for transdermal drug delivery
Qi Lei Wang,Jia Wei Ren,Bo Zhi Chen,Xuan Jin,Can Yang Zhang,Xin Dong Guo 한국공업화학회 2018 Journal of Industrial and Engineering Chemistry Vol.59 No.-
Dissolving microneedles (DMNs) prepared from soluble polymers has been being widely investigated as a safe and effective transdermal delivery system for drug and vaccine. Limited by the materials, the air humidity would probably affect the mechanical property of DMNs, which is essential for the effective needle insertions and drug delivery. In this study, four kinds DMNs prepared by polyvinyl alcohol, sodium hyaluronate (HA), chitosan and gelatin are studied on the mechanical strength and insertion ability under varying humidity conditions. Based on these investigations, we hope to provide the effective time of DMNs to ensure a successful insertion and drug delivery.