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| 1 | Polarization loss analysis and ageing characterisation of transformer oil-immersed insulation by using decoupled frequency domain spectroscopy显示文摘The polarization information contained in the frequency-domain spectroscopy(FDS)could be utilised for characterising the ageing degree of transformer oil-immersed insulation.However,the polarization information will be obscured by its conductance effect,it is thus hard to analyse the polarization behaviour by using the traditional FDS technique.Given this issue,an alternative approach is proposed to analyse the polari-zation information using FDS decoupled by logarithmic-derivative spectroscopy(LDS).Findings proved that the polarization loss information generated by polarization behaviour can be separated from the total dispersion loss.The proposed feature pa-rameters are later used to analyse the polarization loss information under ageing impact.Also,the polarization loss surface is constructed by using these feature parameters to characterise the ageing degrees of oil-immersed samples.Finally,the potential possibility of using the proposed method to analyse the polarization loss and ageing degree are respectively discussed. | Xianhao Fan Jiefeng Liu Yiyi Zhang Zheshi Ding Qingyin Wang | 2022 | High Voltage2022，7，3： | 2 |
| 2 | Micro-nanofiber composite biomimetic conduits promote long-gap peripheral nerve regeneration in canine models显示文摘Peripheral nerve injuries may result in severe long-gap interruptions that are challenging to repair.Autografting is the gold standard surgical approach for repairing long-gap nerve injuries but can result in prominent donor-site complications.Instead,imitating the native neural microarchitecture using synthetic conduits is expected to offer an alternative strategy for improving nerve regeneration.Here,we designed nerve conduits composed of high-resolution anisotropic microfiber grid-cordes with randomly organized nanofiber sheaths to interrogate the positive effects of these biomimetic structures on peripheral nerve regeneration.Anisotropic microfiber-grids demonstrated the capacity to directionally guide Schwann cells and neurites.Nanofiber sheaths conveyed adequate elasticity and permeability,whilst exhibiting a barrier function against the infiltration of fibroblasts.We then used the composite nerve conduits bridge 30-mm long sciatic nerve defects in canine models.At 12 months post-implant,the morphometric and histological recovery,gait recovery,electrophysiological function,and degree of muscle atrophy were assessed.The newly regenerated nerve tissue that formed within the composite nerve conduits showed restored neurological functions that were superior compared to sheaths-only scaffolds and Neurolac nerve conduit controls.Our findings demonstrate the feasibility of using synthetic biophysical cues to effectively bridge long-gap peripheral nerve injuries and indicates the promising clinical application prospects of biomimetic composite nerve conduits. | Xianhao Dong Yueyue Yang Zheheng Bao Adam C.Midgley Feiyi Li Shuxin Dai Zhuangzhuang Yang Jin Wang Lihua Liu Wenlei Li Yayuan Zheng Siyang Liu Yang Liu Weijian Yu Jun Liu Meng Fan Meifeng Zhu Zhongyang Shen Gu Xiaosong Deling Kong | 2023 | Bioactive Materials2023，，12： | 0 |
| 3 | Analysis of low‐frequency polarisation behaviour for oil‐paper insulation using logarithmic‐derivative spectroscopy显示文摘The low‐frequency polarisation information of oil‐paper insulation could be easily obscured by the conductance effect,and the contained polarisation information thus can not be readily extracted from the frequency domain spectroscopy(FDS).Given this issue,an alternative idea is reported to extract the low‐frequency polarisation infor-mation by using logarithmic‐derivative spectroscopy(LDS).The present findings proved that the parameters extracted by using the LDS can be applied for studying the low‐frequency polarisation behaviour under the moisture effect.In that respect,the novelty of this work is in the exploration of the LDS as a potential tool to extract feature parameters for analyzing the low‐frequency polarisation information of trans-former oil‐paper insulation. | Jiefeng Liu Xianhao Fan Yiyi Zhang Benhui Lai Jian Jiao | 2021 | High Voltage2021，6，3： | 0 |
| 4 | 降低可退货运输物品损失率的最优决策显示文摘可回收运输物品(RTI)因其在减少包装垃圾和提高供应链可持续性方面的优势而被广泛使用。然而,RTI的损失将导致产品流与RTI 供应不匹配,从而影响运营的连续性。本文研究了一个由单个制造商和单个零售商组成的RTI供应链,假设零售商可以通过投资于员工培训来减少RTI的损失。我们首先开发一个库存模型来最小化系统的总成本。然后分析了RTI闭环供应链的最优决策问题。我们比较了零售商投资于减少RTI损失和不投资于RTI损失的情况。结果表明,零售商投资减少RTI损失将提高供应链效率,降低系统总成本。然而,零售商只有在成本下降时才会投资。因此,我们认为侧付款是一种有效的激励,以刺激零售商的投资。并建立了考虑投资成本分担的非对称纳什议价模型来协调RTI供应链。我们比较了制造商和零售商的总最优成本。结果表明,该系统能够实现协调,降低了制造商和零售商的最优总成本。 | Xiangxiang Fan Yeming Gong Xianhao Xu Bipan Zou | 2019 | 绿色包装2019，0，3： | 0 |
| 5 | An improved second-order kinetic model for degradation analysis of transformer paper insulation under non-uniform thermal field显示文摘The ageing kinetic model is regarded as an effective tool to describe the degradation of transformer paper insulation.However,the temperature of the transformer winding is unevenly distributed,and the existing ageing kinetic models only depend on experimental data of accelerated thermal ageing at a constant temperature.Given this issue,this work proposes an improved second-order kinetic model accounting for the non-uniform thermal field.First,oil-paper insulation samples with different ageing stages are prepared under the non-uniform thermal field.Then,the sample's experimental data of moisture dispersion and distribution of degree of polymerisation are collected.On this basis,the improved second-order kinetic model is derived to simulate insulating paper's ageing process subjected to an axial temperature gradient.Further,the relationship of the parameters in the improved second-order kinetic model with the temperature and moisture content at different winding heights is obtained.Finally,the proposed model is validated,and the results show that the proposed model is more scientific than the traditional models to describe the degradation of paper insulation.In that respect,this work illustrates an improved second-order kinetic model to provide a reference for the ageing assessment/life prediction of transformer paper insulation under the non-uniform thermal field. | Jiefeng Liu Kuo Jiang Qingyin Wang Heng Zhang Enze Zhang Xianhao Fan Yiyi Zhang | 2023 | High Voltage2023，8，1： | 0 |
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