Rechargeable sodium-ion batteries usually suffer from accelerated electrode destruction at high temperatures and high synthesis costs of electrode materials.Therefore,it is highly desirable to explore novel organic el...Rechargeable sodium-ion batteries usually suffer from accelerated electrode destruction at high temperatures and high synthesis costs of electrode materials.Therefore,it is highly desirable to explore novel organic electrodes considering their cost-effectiveness and large adaptability to volume changes.Herein,natural biomass,pristine lignin,is employed as the sodium-ion battery anodes,and their sodium storage performance is investigated at room temperature and 60℃.The lignin anodes exhibit excellent high-temperature sodium-ion battery performance.This mainly results from the generation of abundant reactive sites(C=O)due to the high temperature-induced homogeneous cleavage of the C_(β)-O bond in the lignin macromolecule.This work can inspire researchers to explore other natural organic materials for large-scale applications and high-value utilization in advanced energy storage devices.展开更多
A lumped mass finite element formulation with consistent nodal quadrature is presented for improved frequency analysis of wave equations with particular reference to the Lagrangian elements with Lobatto nodes.For the ...A lumped mass finite element formulation with consistent nodal quadrature is presented for improved frequency analysis of wave equations with particular reference to the Lagrangian elements with Lobatto nodes.For the Lagrangian Lobatto elements,a lumped mass matrix can be conveniently constructed by employing the nodal quadrature rule that takes the Lobatto nodes as integration points.In the conventional finite element analysis,this nodal quadrature-based lumped mass matrix is usually accompanied by the stiffness matrix computed via the Gauss quadrature.In this work,it is shown that this combination is not optimal regarding the frequency accuracy of finite element analysis of wave equations.To elevate the frequency accuracy,in addition to the lumped mass matrix formulated by the nodal quadrature,a frequency accuracy measure is established as a function of the quadrature rule used in the stiffness matrix integration.This accuracy measure discloses that the frequency accuracy can be optimized if both lumped mass and stiffness matrices are simultaneously computed by the same nodal quadrature rule.These theoretical results are well demonstrated by two-and three-dimensional numerical examples,which clearly show that the proposed consistent nodal quadrature formulation yields much higher frequency accuracy than the conventional finite element analysis with nodal quadrature-based lumped mass and Gauss quadrature-based stiffness matrices for wave equations.展开更多
Glutathione(GSH)is a key maintainer of cellular redox balance and plays an important role in many physiological effects.For example,GSH has been widely implicated in cancer initiation,progression and metastasis.Moreov...Glutathione(GSH)is a key maintainer of cellular redox balance and plays an important role in many physiological effects.For example,GSH has been widely implicated in cancer initiation,progression and metastasis.Moreover,the concentrations of GSH in tumor cells can influence drug resistance.Given the serious harmfulness of cancer and the important roles of GSH in cancer,it has great significance to devel-opment probes for screening of tumor cells and real-time monitoring of GSH fluctuations in tumor cells.However,no targetable probe for reversible imaging of GSH in tumor cells has been reported.Herein,we constructed a melatonin-based targetable and reversible fluorescent probe(GR-MT)for screening of tumor cells and real-time imaging of GSH fluctuations in tumor cells.The probe uses coumarin as the skeleton,Michael addition reaction as the reaction mechanism,and melatonin as the targeted groups of tumor cells.The experimental results demonstrate this probe has many advantages including high selec-tivity,satisfactory sensitivity,excellent reversible ability,rapid reaction speed,and outstanding targetabil-ity of tumor cells.Therefore,this study provides a promising tool for tumor cells screening and real-time detection of GSH fluctuations in specific tumor cells.展开更多
基金financialy supported by the National Natural Science Foundation of China(nos.22078069,22178069,51903254)
文摘Rechargeable sodium-ion batteries usually suffer from accelerated electrode destruction at high temperatures and high synthesis costs of electrode materials.Therefore,it is highly desirable to explore novel organic electrodes considering their cost-effectiveness and large adaptability to volume changes.Herein,natural biomass,pristine lignin,is employed as the sodium-ion battery anodes,and their sodium storage performance is investigated at room temperature and 60℃.The lignin anodes exhibit excellent high-temperature sodium-ion battery performance.This mainly results from the generation of abundant reactive sites(C=O)due to the high temperature-induced homogeneous cleavage of the C_(β)-O bond in the lignin macromolecule.This work can inspire researchers to explore other natural organic materials for large-scale applications and high-value utilization in advanced energy storage devices.
基金supported by the National Natural Science Foundation of China(Grant Nos.12072302 and 11772280)the Natural Science Foundation of Fujian Province of China(Grant No.2021J02003)the Natural Science Foundation of Hebei Province of China(Grant No.A2018209319).
文摘A lumped mass finite element formulation with consistent nodal quadrature is presented for improved frequency analysis of wave equations with particular reference to the Lagrangian elements with Lobatto nodes.For the Lagrangian Lobatto elements,a lumped mass matrix can be conveniently constructed by employing the nodal quadrature rule that takes the Lobatto nodes as integration points.In the conventional finite element analysis,this nodal quadrature-based lumped mass matrix is usually accompanied by the stiffness matrix computed via the Gauss quadrature.In this work,it is shown that this combination is not optimal regarding the frequency accuracy of finite element analysis of wave equations.To elevate the frequency accuracy,in addition to the lumped mass matrix formulated by the nodal quadrature,a frequency accuracy measure is established as a function of the quadrature rule used in the stiffness matrix integration.This accuracy measure discloses that the frequency accuracy can be optimized if both lumped mass and stiffness matrices are simultaneously computed by the same nodal quadrature rule.These theoretical results are well demonstrated by two-and three-dimensional numerical examples,which clearly show that the proposed consistent nodal quadrature formulation yields much higher frequency accuracy than the conventional finite element analysis with nodal quadrature-based lumped mass and Gauss quadrature-based stiffness matrices for wave equations.
基金support from the National Natural Science Foundation of China(Nos.21777053 and 22176070)Shandong Province Higher Educational Youth Innovation Sci-ence and Technology Program(No.2019KJD005).
文摘Glutathione(GSH)is a key maintainer of cellular redox balance and plays an important role in many physiological effects.For example,GSH has been widely implicated in cancer initiation,progression and metastasis.Moreover,the concentrations of GSH in tumor cells can influence drug resistance.Given the serious harmfulness of cancer and the important roles of GSH in cancer,it has great significance to devel-opment probes for screening of tumor cells and real-time monitoring of GSH fluctuations in tumor cells.However,no targetable probe for reversible imaging of GSH in tumor cells has been reported.Herein,we constructed a melatonin-based targetable and reversible fluorescent probe(GR-MT)for screening of tumor cells and real-time imaging of GSH fluctuations in tumor cells.The probe uses coumarin as the skeleton,Michael addition reaction as the reaction mechanism,and melatonin as the targeted groups of tumor cells.The experimental results demonstrate this probe has many advantages including high selec-tivity,satisfactory sensitivity,excellent reversible ability,rapid reaction speed,and outstanding targetabil-ity of tumor cells.Therefore,this study provides a promising tool for tumor cells screening and real-time detection of GSH fluctuations in specific tumor cells.
