In this paper, the time-fractional coupled viscous Burgers' equation(CVBE)and Drinfeld-Sokolov-Wilson equation(DSWE) are solved by the Sawi transform coupled homotopy perturbation method(HPM). The approximate seri...In this paper, the time-fractional coupled viscous Burgers' equation(CVBE)and Drinfeld-Sokolov-Wilson equation(DSWE) are solved by the Sawi transform coupled homotopy perturbation method(HPM). The approximate series solutions to these two equations are obtained. Meanwhile, the absolute error between the approximate solution given in this paper and the exact solution given in the literature is analyzed. By comparison of the graphs of the function when the fractional order α takes different values, the properties of the equations are given as a conclusion.展开更多
In this article,time fractional Fornberg-Whitham equation of He’s fractional derivative is studied.To transform the fractional model into its equivalent differential equation,the fractional complex transform is used ...In this article,time fractional Fornberg-Whitham equation of He’s fractional derivative is studied.To transform the fractional model into its equivalent differential equation,the fractional complex transform is used and He’s homotopy perturbation method is implemented to get the approximate analytical solutions of the fractional-order problems.The graphs are plotted to analysis the fractional-order mathematical modeling.展开更多
To understand the deformation mechanism of molecular crystals under mechanical forces will accelerate the molecular design and preparation of deformable crystals.Herein,the relationship between structural halogenation...To understand the deformation mechanism of molecular crystals under mechanical forces will accelerate the molecular design and preparation of deformable crystals.Herein,the relationship between structural halogenation and molecular-level stacking,micro/nanoscale surface morphology,and macroscopic mechanical properties are investigated.Elastic crystals of halo-pyrimidinyl carbazoles(CzM-Cl,CzM-Br and CzM-I)with lamellar structure and brittle crystal(CzM-F)were quantitatively analyzed by crystal energy framework(CEF)providing the inter/intralayer interaction energy(Inter/Intra-IE).It is revealed that the elastic crystals bend under external force as a result from stronger Intra-IE to prevent cleavage and weaker Inter-IE for the short-range movement of molecules on the slip plane.This research will provide an insight for the molecular design of flexible crystals and facilitate the development of next-generation smart crystal materials.展开更多
The First General Assembly and the First Session of the First Executive Board Meeting of International Society of Mechanical System Dynamics(ISMSD),the ISMSD Launching Ceremony,the Second International Conference on M...The First General Assembly and the First Session of the First Executive Board Meeting of International Society of Mechanical System Dynamics(ISMSD),the ISMSD Launching Ceremony,the Second International Conference on Mechanical System Dynamics(ICMSD),the Second ICMSD Standing Steering Committee Meeting,the Third Editorial Board Meeting of the International Journal of Mechanical System Dynamics(IJMSD),and the IJMSD Expert Symposium 2023 were held as a series of international activities on mechanical system dynamics,during the period from August 31 to September 4,2023,at the Wyndham Beijing North,Beijing,China.展开更多
Due to the limitations in autogenous nerve grafting or Schwann cell transplantation,large gap peripheral nerve injuries require a bridging strategy supported by nerve conduit.Cell based therapies provide a novel treat...Due to the limitations in autogenous nerve grafting or Schwann cell transplantation,large gap peripheral nerve injuries require a bridging strategy supported by nerve conduit.Cell based therapies provide a novel treatment for peripheral nerve injuries.In this study,we first experimented an optimal scaffold material synthesis protocol,from where we selected the 10%GFD formula(10%GelMA hydrogel,recombinant human basic fibroblast growth factor and dental pulp stem cells(DPSCs))to fill a cellulose/soy protein isolate composite membrane(CSM)tube to construct a third generation of nerve regeneration conduit,CSM-GFD.Then this CSM-GFD conduit was applied to repair a 15-mm long defect of sciatic nerve in a rat model.After 12 week post implant surgery,at histologic level,we found CSM-GFD conduit could regenerate nerve tissue like neuron and Schwann like nerve cells and myelinated nerve fibers.At physical level,CSM-GFD achieved functional recovery assessed by a sciatic functional index study.In both levels,CSM-GFD performed like what gold standard,the nerve autograft,could do.Further,we unveiled that almost all newly formed nerve tissue at defect site was originated from the direct differentiation of exogeneous DPSCs in CSM-GFD.In conclusion,we claimed that this third-generation nerve regeneration conduit,CSM-GFD,could be a promising tissue engineering approach to replace the conventional nerve autograft to treat the large gap defect in peripheral nerve injuries.展开更多
Diabetes is a chronic metabolic disease characterized by high glucose concentration in blood.Conventional management of diabetes requires skin pricking and subcutaneous injection,causing physical pain and physiologica...Diabetes is a chronic metabolic disease characterized by high glucose concentration in blood.Conventional management of diabetes requires skin pricking and subcutaneous injection,causing physical pain and physiological issues to diabetic individuals.Hydrogels possess unique advantages such as lightweight,stretchability,biocompatibility,and biodegradability,offering the opportunities to be integrated as flexible devices for diabetes management.This review highlights the development of hydrogels as flexible materials for diabetes applications in glucose monitoring,insulin delivery,wound care,and cell transplantation in recent years.Challenges and prospects in the development of hydrogel-based flexible devices for personalized management of diabetes are discussed as well.展开更多
Organic phosphorescence materials demonstrate potential optoelectronic applications due to their remarkably ultralong organic phosphorescence(UOP)lifetime and abundant optical characteristics prior to the fluorescence...Organic phosphorescence materials demonstrate potential optoelectronic applications due to their remarkably ultralong organic phosphorescence(UOP)lifetime and abundant optical characteristics prior to the fluorescence materials.For a better insight into the intrinsic relationship among regioisomeric molecules,crystalline interactions,and phosphorescence properties,three crystalline dicarbazol-9-yl pyrazine-based regioisomers with para-,meta-and ortho-convergent substitutions(p-DCzP,m-DCzP,and o-DCzP)were designed and presented gradually increased UOP lifetimes prolonging from 63.14,127.93 to 350.46 ms,respectively,due to the regioisomerism effect(RIE)which would be an effective strategy for better understanding of structure-property of UOP materials.展开更多
SrTiO_3 nanotube films with good adhesion strengths to Ti substrates were fabricated by using a hybrid approach with a modified anodization and a hydrothermal treatment(HT). The effect of Sr^(2+) concentration in HT s...SrTiO_3 nanotube films with good adhesion strengths to Ti substrates were fabricated by using a hybrid approach with a modified anodization and a hydrothermal treatment(HT). The effect of Sr^(2+) concentration in HT solutions on the morphologies and phase components of the nanotubes were investigated,the SrTiO_3 nanotubes formation mechanism was explored, and the adhesion strengths, hydrophilicity and apatite-forming ability of the SrTiO_3 nanotubes were also evaluated. The results demonstrated that with increasing the incorporation of Sr^(2+) into the nanotubes, no obvious changes of the lengths and outer diameters of the nanotubes were observed, but the wall thickness and the crystallinity of SrTiO_3 in the nanotubes increased. The accumulation of Sr at the inner tube wall indicated that the reaction of Sr^(2+) with TiO_2 mainly occurred in the vicinity of internal surfaces of the closely arranged nanotubes. The formation of the SrTiO_3 nanotubes could be attributed to an in situ dissolution–recrystallization process.The Sr TiO_3 nanotubes exhibited good hydrophilicity and bioactivity, and the induced apatite preferred to nucleate on the nanotubes with higher crystallinity and Sr content, indicating a good bio-adaptability of the SrTiO_3 nanotubes for orthopedic application.展开更多
Two electron-deficient azaacenes including di-and tetra-cyanodiazafluorene(DCAF and TCAF)with the advantages of deep lowest unoccupied molecular orbital(LUMO),green-synthesis,low-cost,simply purification method,excell...Two electron-deficient azaacenes including di-and tetra-cyanodiazafluorene(DCAF and TCAF)with the advantages of deep lowest unoccupied molecular orbital(LUMO),green-synthesis,low-cost,simply purification method,excellent yields have been obtained,characterized and used as electron injection materials(EIMs)in three groups of electroluminescence devices.Device B with TCAF as EIM exhibited the best performance including turn-on voltage of 5.0 V,stronger maximum luminance intensity of 31,549 cd/m2,higher luminance efficiency of 62.34 cd/A and larger power efficiency of 21.74 lm/W which are 0.53,6.7,9.3 and 15.3 times than that of device A with DCAF as EIMs,respectively.The enhanced interfacial electron injection ability of TCAF than that of DCAF is supported by its better electron mobility in electron-only device,deeper LUMO(-4.52 eV),and stronger electronic affinity.Best external quantum efficiency of 16.56%was achieved with optimized thicknesses of TCAF as EIM and TPBi as electron transporting layer.As a new comer of acceptor family,TCAF would push forward organic electronics with more fascinating and significant applications.展开更多
The structure parameters of 6-degree of freedom(DOF)vibration isolation platform have a significant effect on its performance.To make the designed vibration isolation platform perform well,non-dominanted sorting genet...The structure parameters of 6-degree of freedom(DOF)vibration isolation platform have a significant effect on its performance.To make the designed vibration isolation platform perform well,non-dominanted sorting genetic algorithm version II(NSGA-II)was applied to optimize its structure based on the transfer matrix method for multibody systems.Firstly,the Jacobian matrix of 6-DOF vibration isolation platform was solved based on kinematics.Secondly,the transfer equation of 6-DOF vibration isolation system was established by the linear transfer matrix method for multibody systems.And the formula of its natural frequency was derived according to the boundary conditions of the system.Thirdly,the manipulability index was constructed based on a dimensionless Jacobian matrix.And a new performance index function was established considering the influence of dynamic isotropic and legs mass.Fourthly,genetic algorithm(GA)and NSGA-II were used to optimize the structure of the 6-DOF vibration isolation platform under the same conditions,respectively.It showed that NSGA-II had higher optimization efficiency,better calculation accuracy and shorter optimization time than that of GA.Finally,NSGA-II was adopted for multi-objective optimization design of 6-DOF vibration isolation platform based on the constraint conditions.Optimal Pareto solutions were obtained,which provides structural parameters for subsequent design work.Therefore,the proposed optimization method and the performance index in this paper provide a theoretical basis for the optimal design of relevant vibration isolation mechanism.展开更多
The authors regret that the author(A.H.)was removed as an agreement could not be reached between the two affiliations of the author.The authors would like to apologise for any inconvenience caused.
The first International Conference on Mechanical System Dynamics(ICMSD),a major international conference in the field of mechanical system dynamics,was held as a hybrid in‐person/virtual conference during the period ...The first International Conference on Mechanical System Dynamics(ICMSD),a major international conference in the field of mechanical system dynamics,was held as a hybrid in‐person/virtual conference during the period August 24–27,2022,in Nanjing,China,an ancient major cultural city.More than 2000 scientists and engineering experts from more than 20 countries in Asia,Europe,America,Africa,and Oceania,including 29 members of the National Academy of Sciences/Engineering,13 presidents of international academic societies,and 15 Editors‐in‐Chief of international journals,attended the conference,as shown in Figures 1 and 2.Focusing on the theme of“Promoting Science,Technology and Industry by Mechanical System Dynamics,”the conference defines a new chapter in the development of the field of mechanical system dynamics.展开更多
基金Project supported by the National Natural Science Foundation of China (No. 10561151)the Basic Science Research Fund in the Universities Directly Under the Inner Mongolia Autonomous Region(No. JY20220003)the Scientific Research Project of Hetao College of China (No. HYZQ202122)。
文摘In this paper, the time-fractional coupled viscous Burgers' equation(CVBE)and Drinfeld-Sokolov-Wilson equation(DSWE) are solved by the Sawi transform coupled homotopy perturbation method(HPM). The approximate series solutions to these two equations are obtained. Meanwhile, the absolute error between the approximate solution given in this paper and the exact solution given in the literature is analyzed. By comparison of the graphs of the function when the fractional order α takes different values, the properties of the equations are given as a conclusion.
基金supported by the National Natural Science Foundation of China under Grant No.11561051。
文摘In this article,time fractional Fornberg-Whitham equation of He’s fractional derivative is studied.To transform the fractional model into its equivalent differential equation,the fractional complex transform is used and He’s homotopy perturbation method is implemented to get the approximate analytical solutions of the fractional-order problems.The graphs are plotted to analysis the fractional-order mathematical modeling.
基金the primary financial support by the National Natural Science Foundation of China (No. 21975126)the open research fund from Anhui Province Key Laboratory of Optoelectronic Materials Science and Technology+1 种基金the Technology and Research Innovation in University of Jiangsu Province (No.KYCX21_0772)the Ministry of Education and Synergetic Innovation Center for Organic Electronics and Information Displays
文摘To understand the deformation mechanism of molecular crystals under mechanical forces will accelerate the molecular design and preparation of deformable crystals.Herein,the relationship between structural halogenation and molecular-level stacking,micro/nanoscale surface morphology,and macroscopic mechanical properties are investigated.Elastic crystals of halo-pyrimidinyl carbazoles(CzM-Cl,CzM-Br and CzM-I)with lamellar structure and brittle crystal(CzM-F)were quantitatively analyzed by crystal energy framework(CEF)providing the inter/intralayer interaction energy(Inter/Intra-IE).It is revealed that the elastic crystals bend under external force as a result from stronger Intra-IE to prevent cleavage and weaker Inter-IE for the short-range movement of molecules on the slip plane.This research will provide an insight for the molecular design of flexible crystals and facilitate the development of next-generation smart crystal materials.
文摘The First General Assembly and the First Session of the First Executive Board Meeting of International Society of Mechanical System Dynamics(ISMSD),the ISMSD Launching Ceremony,the Second International Conference on Mechanical System Dynamics(ICMSD),the Second ICMSD Standing Steering Committee Meeting,the Third Editorial Board Meeting of the International Journal of Mechanical System Dynamics(IJMSD),and the IJMSD Expert Symposium 2023 were held as a series of international activities on mechanical system dynamics,during the period from August 31 to September 4,2023,at the Wyndham Beijing North,Beijing,China.
基金supported by the National Natural Science Funding of China(81701032,81871503)the Wenzhou Science and Technology Association Project,the Wenzhou Major Scientific and Technological Innovation Key Medical and Health Project(ZY2019010)+4 种基金the Wenzhou Medical University grant(QTJ16026)Wenzhou Science and Technology Association Project,Wenzhou Basic Research Project(Y20180131)Zhejiang Province Program of the Medical and Health Science and Technology(2018KY537)Zhejiang Natural Science Foundation(LGF18C100002)Zhejiang Xinmiao Talents Program(2018R413186).
文摘Due to the limitations in autogenous nerve grafting or Schwann cell transplantation,large gap peripheral nerve injuries require a bridging strategy supported by nerve conduit.Cell based therapies provide a novel treatment for peripheral nerve injuries.In this study,we first experimented an optimal scaffold material synthesis protocol,from where we selected the 10%GFD formula(10%GelMA hydrogel,recombinant human basic fibroblast growth factor and dental pulp stem cells(DPSCs))to fill a cellulose/soy protein isolate composite membrane(CSM)tube to construct a third generation of nerve regeneration conduit,CSM-GFD.Then this CSM-GFD conduit was applied to repair a 15-mm long defect of sciatic nerve in a rat model.After 12 week post implant surgery,at histologic level,we found CSM-GFD conduit could regenerate nerve tissue like neuron and Schwann like nerve cells and myelinated nerve fibers.At physical level,CSM-GFD achieved functional recovery assessed by a sciatic functional index study.In both levels,CSM-GFD performed like what gold standard,the nerve autograft,could do.Further,we unveiled that almost all newly formed nerve tissue at defect site was originated from the direct differentiation of exogeneous DPSCs in CSM-GFD.In conclusion,we claimed that this third-generation nerve regeneration conduit,CSM-GFD,could be a promising tissue engineering approach to replace the conventional nerve autograft to treat the large gap defect in peripheral nerve injuries.
基金supported by National Natural Science Foundation of China(52003224,52073230,and 61935017)Natural Science Basic Research Program of Shaanxi Province(2020GXLH-Z-013,2019JQ-157,and 2019KJXX-064)+3 种基金Projects of International Cooperation and Exchanges NSFC(51811530018)Ningbo Natural Science Foundation(202003N4051)Fundamental Research Funds for Central UniversitiesT.J.W.was supported by funding from Yulin Municipal Science and Technology Bureau and the open research fund of Key Laboratory for Organic Electronics and Information Displays.
文摘Diabetes is a chronic metabolic disease characterized by high glucose concentration in blood.Conventional management of diabetes requires skin pricking and subcutaneous injection,causing physical pain and physiological issues to diabetic individuals.Hydrogels possess unique advantages such as lightweight,stretchability,biocompatibility,and biodegradability,offering the opportunities to be integrated as flexible devices for diabetes management.This review highlights the development of hydrogels as flexible materials for diabetes applications in glucose monitoring,insulin delivery,wound care,and cell transplantation in recent years.Challenges and prospects in the development of hydrogel-based flexible devices for personalized management of diabetes are discussed as well.
基金supported by the National Natural Science Foundation of China(Nos.21975126,51673095,21875104,21875191,21603104)the Natural Science Foundation of Jiangsu Province(Nos.BK20171470,BK20160991,BK20150064,BK20130912)+1 种基金973 Program(No.2015CB932200)Ministry of Education and Synergetic Innovation Center for Organic Electronics and Information Displays for financial support
文摘Organic phosphorescence materials demonstrate potential optoelectronic applications due to their remarkably ultralong organic phosphorescence(UOP)lifetime and abundant optical characteristics prior to the fluorescence materials.For a better insight into the intrinsic relationship among regioisomeric molecules,crystalline interactions,and phosphorescence properties,three crystalline dicarbazol-9-yl pyrazine-based regioisomers with para-,meta-and ortho-convergent substitutions(p-DCzP,m-DCzP,and o-DCzP)were designed and presented gradually increased UOP lifetimes prolonging from 63.14,127.93 to 350.46 ms,respectively,due to the regioisomerism effect(RIE)which would be an effective strategy for better understanding of structure-property of UOP materials.
基金the financial supports form the National Basic Research Program of China (973 Program, Grant No. 2012CB619103)the National Natural Science Foundation of China (Grant Nos. 51201129 and 51371137)+2 种基金the Natural Science Foundation of Shanxi Province (Grant No. 2015JQ5130)the Open Research Fund of State Key Laboratory of Bioelectronics, Southeast Universitythe Fundamental Research Funds for the Central Universities
文摘SrTiO_3 nanotube films with good adhesion strengths to Ti substrates were fabricated by using a hybrid approach with a modified anodization and a hydrothermal treatment(HT). The effect of Sr^(2+) concentration in HT solutions on the morphologies and phase components of the nanotubes were investigated,the SrTiO_3 nanotubes formation mechanism was explored, and the adhesion strengths, hydrophilicity and apatite-forming ability of the SrTiO_3 nanotubes were also evaluated. The results demonstrated that with increasing the incorporation of Sr^(2+) into the nanotubes, no obvious changes of the lengths and outer diameters of the nanotubes were observed, but the wall thickness and the crystallinity of SrTiO_3 in the nanotubes increased. The accumulation of Sr at the inner tube wall indicated that the reaction of Sr^(2+) with TiO_2 mainly occurred in the vicinity of internal surfaces of the closely arranged nanotubes. The formation of the SrTiO_3 nanotubes could be attributed to an in situ dissolution–recrystallization process.The Sr TiO_3 nanotubes exhibited good hydrophilicity and bioactivity, and the induced apatite preferred to nucleate on the nanotubes with higher crystallinity and Sr content, indicating a good bio-adaptability of the SrTiO_3 nanotubes for orthopedic application.
基金the National Natural Science Foundation of China(Nos.21975126,51673095,21875104,21875191,21603104)the Natural Science Foundation of Jiangsu Province(Nos.BK20171470,BK20160991,BK20150064,BK20130912)+1 种基金973 Program(No.2015CB932200)Ministry of Education and Synergetic Innovation Center for Organic Electronics and Information Displays for financial support
文摘Two electron-deficient azaacenes including di-and tetra-cyanodiazafluorene(DCAF and TCAF)with the advantages of deep lowest unoccupied molecular orbital(LUMO),green-synthesis,low-cost,simply purification method,excellent yields have been obtained,characterized and used as electron injection materials(EIMs)in three groups of electroluminescence devices.Device B with TCAF as EIM exhibited the best performance including turn-on voltage of 5.0 V,stronger maximum luminance intensity of 31,549 cd/m2,higher luminance efficiency of 62.34 cd/A and larger power efficiency of 21.74 lm/W which are 0.53,6.7,9.3 and 15.3 times than that of device A with DCAF as EIMs,respectively.The enhanced interfacial electron injection ability of TCAF than that of DCAF is supported by its better electron mobility in electron-only device,deeper LUMO(-4.52 eV),and stronger electronic affinity.Best external quantum efficiency of 16.56%was achieved with optimized thicknesses of TCAF as EIM and TPBi as electron transporting layer.As a new comer of acceptor family,TCAF would push forward organic electronics with more fascinating and significant applications.
基金supported by the National Natural Science Foundation of China(Grant 51975298)the Natural Science Foundation of Jiangsu Province(Grant BK20181301)the National Science Foundation of China(Grant 11874303).
文摘The structure parameters of 6-degree of freedom(DOF)vibration isolation platform have a significant effect on its performance.To make the designed vibration isolation platform perform well,non-dominanted sorting genetic algorithm version II(NSGA-II)was applied to optimize its structure based on the transfer matrix method for multibody systems.Firstly,the Jacobian matrix of 6-DOF vibration isolation platform was solved based on kinematics.Secondly,the transfer equation of 6-DOF vibration isolation system was established by the linear transfer matrix method for multibody systems.And the formula of its natural frequency was derived according to the boundary conditions of the system.Thirdly,the manipulability index was constructed based on a dimensionless Jacobian matrix.And a new performance index function was established considering the influence of dynamic isotropic and legs mass.Fourthly,genetic algorithm(GA)and NSGA-II were used to optimize the structure of the 6-DOF vibration isolation platform under the same conditions,respectively.It showed that NSGA-II had higher optimization efficiency,better calculation accuracy and shorter optimization time than that of GA.Finally,NSGA-II was adopted for multi-objective optimization design of 6-DOF vibration isolation platform based on the constraint conditions.Optimal Pareto solutions were obtained,which provides structural parameters for subsequent design work.Therefore,the proposed optimization method and the performance index in this paper provide a theoretical basis for the optimal design of relevant vibration isolation mechanism.
文摘The authors regret that the author(A.H.)was removed as an agreement could not be reached between the two affiliations of the author.The authors would like to apologise for any inconvenience caused.
文摘The first International Conference on Mechanical System Dynamics(ICMSD),a major international conference in the field of mechanical system dynamics,was held as a hybrid in‐person/virtual conference during the period August 24–27,2022,in Nanjing,China,an ancient major cultural city.More than 2000 scientists and engineering experts from more than 20 countries in Asia,Europe,America,Africa,and Oceania,including 29 members of the National Academy of Sciences/Engineering,13 presidents of international academic societies,and 15 Editors‐in‐Chief of international journals,attended the conference,as shown in Figures 1 and 2.Focusing on the theme of“Promoting Science,Technology and Industry by Mechanical System Dynamics,”the conference defines a new chapter in the development of the field of mechanical system dynamics.
