Grounding devices are significant to the operation of the power transmission line and power equipment.The soil and leakage current can easily cause the corrosion of carbon steel grounding devices,resulting in power ac...Grounding devices are significant to the operation of the power transmission line and power equipment.The soil and leakage current can easily cause the corrosion of carbon steel grounding devices,resulting in power accidents.Therefore,most carbon steel grounding devices in service are already corroded,and the accurate calculation of grounding parameters for corroded grounding devices is important.However,most existing methods for calculating the grounding parameters of corroded grounding devices usually have the following disadvantages:1)They only consider whether the grounding devices are broken or not,and cannot analyze the grounding parameters of grounding devices with different corrosion degrees;2)They assume that the corroded grounding device is a conductor with a smaller diameter,and ignore the impact of the corrosion product layer,resulting in calculation errors.To solve the above problems,this paper establishes an accurate corrosion model for grounding devices based on the volume expansion coefficient of corrosion products.The grounding parameters calculation method for corroded grounding devices is proposed based on the boundary element method(BEM)and Galerkin’s method.Then the grounding performance of tower grounding grids with different corrosion degrees in different soils(uniform and layered)is analyzed.Finally,some features of grounding parameters of corroded grounding devices are given.This study can accurately calculate the grounding parameters of the corroded grounding devices and has far-reaching engineering significance for the safety of power equipment.展开更多
Nobiletin(NOB)is a kind of polymethoxyflavonoids(PMFs)exclusively present in citrus fruits.It exhibits diverse biological activities,with particular emphasis on its regulatory effect on lipid metabolism,which has garn...Nobiletin(NOB)is a kind of polymethoxyflavonoids(PMFs)exclusively present in citrus fruits.It exhibits diverse biological activities,with particular emphasis on its regulatory effect on lipid metabolism,which has garnered significant attention from researchers in recent years.The disorder of lipid metabolism serves as the underlying cause for a range of metabolic disorders.Both in vivo and in vitro studies have demonstrated that NOB and its metabolites possess the ability to regulate lipid metabolism in conditions associated with lipid metabolism disorders,including obesity,fatty liver,diabetes,and atherosclerosis.Furthermore,they can mitigate the progression of these diseases.The modulation of inflammatory state,reduction of oxidative stress,regulation of microbiota and lipid metabolism pathway are likely to be crucial mechanisms through which NOB exerts its effects on lipid metabolism.Additionally,NOB is a small molecule known to regulate circadian rhythm,which also serves as an important target for NOB in regulating lipid metabolism.This article presents a comprehensive review of the primary research findings on the impact of NOB and its metabolites on lipid metabolism disorders-related diseases,while also analyzing the mechanism of action underlying NOB's effects.These insights provide a solid theoretical foundation for further research and development into NOB,ultimately maximizing the beneficial impacts of citrus fruits.展开更多
基金supported by the Fundamental Research Funds for the Central Universities(grant no.2019CDXYDQ0010)the National Key Research and Development Program of China(grant no.2017YFB0902701)the National Natural Science Foundation of China(grant no.51577017).
文摘Grounding devices are significant to the operation of the power transmission line and power equipment.The soil and leakage current can easily cause the corrosion of carbon steel grounding devices,resulting in power accidents.Therefore,most carbon steel grounding devices in service are already corroded,and the accurate calculation of grounding parameters for corroded grounding devices is important.However,most existing methods for calculating the grounding parameters of corroded grounding devices usually have the following disadvantages:1)They only consider whether the grounding devices are broken or not,and cannot analyze the grounding parameters of grounding devices with different corrosion degrees;2)They assume that the corroded grounding device is a conductor with a smaller diameter,and ignore the impact of the corrosion product layer,resulting in calculation errors.To solve the above problems,this paper establishes an accurate corrosion model for grounding devices based on the volume expansion coefficient of corrosion products.The grounding parameters calculation method for corroded grounding devices is proposed based on the boundary element method(BEM)and Galerkin’s method.Then the grounding performance of tower grounding grids with different corrosion degrees in different soils(uniform and layered)is analyzed.Finally,some features of grounding parameters of corroded grounding devices are given.This study can accurately calculate the grounding parameters of the corroded grounding devices and has far-reaching engineering significance for the safety of power equipment.
基金supported by the Guangdong Key R&D Program(Grant number:2022B0202030001).
文摘Nobiletin(NOB)is a kind of polymethoxyflavonoids(PMFs)exclusively present in citrus fruits.It exhibits diverse biological activities,with particular emphasis on its regulatory effect on lipid metabolism,which has garnered significant attention from researchers in recent years.The disorder of lipid metabolism serves as the underlying cause for a range of metabolic disorders.Both in vivo and in vitro studies have demonstrated that NOB and its metabolites possess the ability to regulate lipid metabolism in conditions associated with lipid metabolism disorders,including obesity,fatty liver,diabetes,and atherosclerosis.Furthermore,they can mitigate the progression of these diseases.The modulation of inflammatory state,reduction of oxidative stress,regulation of microbiota and lipid metabolism pathway are likely to be crucial mechanisms through which NOB exerts its effects on lipid metabolism.Additionally,NOB is a small molecule known to regulate circadian rhythm,which also serves as an important target for NOB in regulating lipid metabolism.This article presents a comprehensive review of the primary research findings on the impact of NOB and its metabolites on lipid metabolism disorders-related diseases,while also analyzing the mechanism of action underlying NOB's effects.These insights provide a solid theoretical foundation for further research and development into NOB,ultimately maximizing the beneficial impacts of citrus fruits.
