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78 fs SWCNT-SA mode-locked Tm:CLNGG disordered garnet crystal laser at 2017 nm
Wang, Yicheng,Zhao, Yongguang,Pan, Zhongben,Bae, Ji Eun,Choi, Sun Young,Rotermund, Fabian,Loiko, Pavel,Serres, Josep Maria,Mateos, Xavier,Yu, Haohai,Zhang, Huaijin,Mero, Mark,Griebner, Uwe,Petrov, Val The Optical Society 2018 Optics letters Vol.43 No.17
Weiqi Wang,Yicheng Ye,Qihu Wang,Xiaoyun Liu,Fan Yang,Wenkan Tan 국제구조공학회 2020 Structural Engineering and Mechanics, An Int'l Jou Vol.76 No.2
Aiming at the mechanical and structural characteristics of the contact zone composite rock, the shear tests and numerical studies were carried out. The effects of the differences in mechanical properties of different materials and the normal stress on shear properties of contact zone composite samples were analyzed from a macro-meso level. The results show that the composite samples have high shear strength, and the interface of different materials has strong adhesion. The differences in mechanical properties of materials weakens the shear strength and increase the shear brittleness of the sample, while normal stress will inhibit these effect. Under low/high normal stress, the sample show two failure modes, at the meso-damage level: elastic-shearing-frictional sliding and elastic-extrusion wear. This is mainly controlled by the contact and friction state of the material after damage. The secondary failure of undulating structure under normal-shear stress is the nature of extrusion wear, which is positively correlated to the normal stress and the degree of difference in mechanical properties of different materials. The increase of the mechanical difference of the sample will enhance the shear brittleness under lower normal stress and the shear interaction under higher normal stress.
Weiqi Wang,Yicheng Ye,Qihu Wang,Xiaoyun Liu,Zhouhao Yuan,Pengcheng Li 대한토목학회 2020 KSCE JOURNAL OF CIVIL ENGINEERING Vol.24 No.2
The deformation and failure of composite rock masses at the contact zone can cause serious safety hazards in underground engineering. Therefore, uniaxial compression experiment and numerical studies of composite samples were conducted. Combined with theoretical analysis, the effects of differences in the mechanical properties of two media on the mechanical properties and failure form of composite samples were investigated. The results show that the difference in mechanical properties of two media weakened the strength and elastic modulus of the composite sample and resulted in complex failure form of the sample. Additionally, the peaks of the AE frequencies of the two media occurred successively after the peak stress of the sample. At the macrolevel, the two media failed successively. These effects are more pronounced as the degree of difference in the mechanical properties of the two media increased. The difference in mechanical properties of the two media resulted in uncoordinated deformation and constrained stress near the contact interface, and the difference in Poisson's ratio is the main factor. The influence (enhanced or weakened) of uncoordinated deformation on the mechanical properties of the composite sample is affected by differences in the elastic modulus and Poisson's ratios of the two media.
Yicheng Yang,Jin Tong,Hongyin Ruan,Meihua Yang,Chunli Sang,Gang Liu,Wurelihazi Hazihan,Bin Xu,Sandor Hornok,Kadyken Rizabek,Kulmanova Gulzhan,Zhiqiang Liu,Yuanzhi Wang 대한기생충학열대의학회 2021 The Korean Journal of Parasitology Vol.59 No.1
To date, there is no report on the genetic diversity of ticks in these regions. A total of 370 representative ticks from the south and east regions of Kazakhstan (SERK) and Xinjiang Uygur Autonomous Region (XUAR) were selected for molecular comparison. A fragment of the mitochondrial cytochrome c oxidase subunit I (cox1) gene, ranging from 631 bp to 889 bp, was used to analyze genetic diversity among these ticks. Phylogenetic analyses indicated 7 tick species including Hyalomma asiaticum, Hyalomma detritum, Hyalomma anatolicum, Dermacentor marginatus, Rhipicephalus sanguineus, Rhipicephalus turanicus and Haemaphysalis erinacei from the SERK clustered together with conspecific ticks from the XUAR. The network diagram of haplotypes showed that i) Hy. asiaticum from Almaty and Kyzylorda Oblasts together with that from Yuli County of XUAR constituted haplogroup H-2, and the lineage from Chimkent City of South Kazakhstan was newly evolved; and ii) the R. turanicus ticks sampled in Israel, Almaty, South Kazakhstan, Usu City, Ulugqat and Baicheng Counties of XUAR were derivated from an old lineage in Alataw City of XUAR. These findings indicate that: i) Hy. asiaticum, R. turanicus and Ha. erinacei shared genetic similarities between the SERK and XUAR; and ii) Hy. marginatum and D. reticulatus show differences in their evolution.
Wang Yongqiang,Liu Han,Feng Changhui,Guan Jie,Geng Yicheng 한국섬유공학회 2019 Fibers and polymers Vol.20 No.10
Electric tree aging due to the action of long-term partial discharge stress of epoxy resin casting insulation is amajor problem in electrical engineering. On the discharge experimental platform, initiation and culture experiments of theelectric trees were carried out at a power frequency voltage of 20 kV. The mass fractions of the spherical glass fibers were 0,0.5, 1, 2 and 3 %. The results showed that the electrical dendritic process of epoxy resin experienced initiation, growth, lagand burst periods, the phase maps of the corresponding partial discharges in the four periods were all “mountain-like”. Theelectric tree of pure epoxy resin showed a typical dendritic structure, after the glass fiber was properly added, the electric treebecame lighter in color with a more complicated shape, the damage also became more serious, however, the growth of theelectric branch was suppressed. The electric tree aging channel of the epoxy resin appeared black and under microscopy themicro-branched channel wall appeared white. When the amount of glass fiber was 2 %, the initiation time of the electric treeswas prolonged, the growth rate of the electric trees decreased and suppressing development of the electric tree branches wasoptimal.
Imbalance phenomenon caused by CPS-PWM strategy for MMC systems
Wang, Chuyang,Zhang, Li,Zhang, Zitao,Tao, Yicheng The Korean Institute of Power Electronics 2021 JOURNAL OF POWER ELECTRONICS Vol.21 No.1
The carrier phase-shift PWM strategy is widely used in modular multilevel converters to satisfy the driver demands of the numerous switches in submodules. However, the traditional carrier phase-shift PWM strategy can cause an imbalance phenomenon in the submodule capacitor voltages, which deteriorates the system working performance. This study develops a mathematical model of an MMC system, which is the basis of a quantitative analysis of the relations between the PWM strategy and the imbalance phenomenon. A novel method is then proposed to provide an accurate description of the cause of the imbalance phenomenon in relation to the PWM strategy. Based on the above analysis, a quantitative analysis of the imbalance phenomenon in the capacitor voltages is used to further measure the magnitudes of the imbalance phenomenon. The effect of the PWM strategy on the capacitor voltages is finally demonstrated via experiments.
Yifan Wang,Hao Wei,Zhen Song,Liqun Jiang,Mi Zhang,Xiao Lu,Wei Li,Yuqing Zhao,Lei Wu,Shuxian Li,Huijuan Shen,Qiang Shu,Yicheng Xie 고려인삼학회 2024 Journal of Ginseng Research Vol.48 No.1
Background: Lung inflammation occurs in many lung diseases, but has limited effective therapeutics. Ginseng andits derivatives have anti-inflammatory effects, but their unstable physicochemical and metabolic propertieshinder their application in the treatment. Panaxadiol (PD) is a stable saponin among ginsenosides. Inhalationadministration may solve these issues, and the specific mechanism of action needs to be studied. Methods: A mouse model of lung inflammation induced by lipopolysaccharide (LPS), an in vitro macrophageinflammation model, and a coculture model of epithelial cells and macrophages were used to study the effectsand mechanisms of inhalation delivery of PD. Pathology and molecular assessments were used to evaluate efficacy. Transcriptome sequencing was used to screen the mechanism and target. Finally, the efficacy andmechanism were verified in a human BALF cell model. Results: Inhaled PD reduced LPS-induced lung inflammation in mice in a dose-dependent manner, includinginflammatory cell infiltration, lung tissue pathology, and inflammatory factor expression. Meanwhile, the dose ofinhalation was much lower than that of intragastric administration under the same therapeutic effect, which maybe related to its higher bioavailability and superior pharmacokinetic parameters. Using transcriptome analysisand verification by a coculture model of macrophage and epithelial cells, we found that PD may act by inhibitingTNFA/TNFAR and IL7/IL7R signaling to reduce macrophage inflammatory factor-induced epithelial apoptosisand promote proliferation. Conclusion: PD inhalation alleviates lung inflammation and pathology by inhibiting TNFA/TNFAR and IL7/IL7Rsignaling between macrophages and epithelial cells. PD may be a novel drug for the clinical treatment of lunginflammation.
Sub-80 fs mode-locked Tm,Ho-codoped disordered garnet crystal oscillator operating at 2081 nm
Pan, Zhongben,Wang, Yicheng,Zhao, Yongguang,Kowalczyk, Maciej,Sotor, Jarosław,Yuan, Hualei,Zhang, Yan,Dai, Xiaojun,Cai, Huaqiang,Bae, Ji Eun,Choi, Sun Young,Rotermund, Fabian,Loiko, Pavel,Serres, Jose The Optical Society 2018 Optics letters Vol.43 No.20