Orthorhombic Nb_(2)O_(5)(T-Nb_(2)O_(5))is attractive for fast-charging Li-ion batteries,but it is still hard to realize rapid charge transfer kinetics for Li-ion storage.Herein,F-doped T-Nb_(2)O_(5) microflowers(F-Nb_(...Orthorhombic Nb_(2)O_(5)(T-Nb_(2)O_(5))is attractive for fast-charging Li-ion batteries,but it is still hard to realize rapid charge transfer kinetics for Li-ion storage.Herein,F-doped T-Nb_(2)O_(5) microflowers(F-Nb_(2)O_(5))are rationally synthesized through topotactic conversion.Specifically,F-Nb_(2)O_(5) are assembled by single-crystal nanoflakes with nearly 97%exposed(100)facet,which maximizes the exposure of the feasible Li^(+)transport pathways along loosely packed 4g atomic layers to the electrolytes,thus effectively enhancing the Li^(+)-intercalation performance.Besides,the band gap of F-Nb_(2)O_(5) is reduced to 2.87 eV due to the doping of F atoms,leading to enhanced electrical conductivity.The synergetic effects between tailored exposed crystal facets,F-doping,and ultrathin building blocks,speed up the Li^(+)/electron transfer kinetics and improve the pseudocapacitive properties of F-Nb_(2)O_(5).Therefore,F-Nb_(2)O_(5) exhibit superior rate capability(210.8 and 164.9 mAh g^(-1) at 1 and 10 C,respectively)and good long-term 10 C cycling performance(132.7 mAh g^(-1) after 1500 cycles).展开更多
The olivine-type lithium iron phosphate(LiFePO_(4))cathode material is promising and widely used as a high-performance lithium-ion battery cathode material in commercial batteries due to its low cost,environmental fri...The olivine-type lithium iron phosphate(LiFePO_(4))cathode material is promising and widely used as a high-performance lithium-ion battery cathode material in commercial batteries due to its low cost,environmental friendliness,and high safety.At present,LiFePO_(4)/C sec-ondary batteries are widely used for electronic products,automotive power batteries,and other occasion-related applications with good thermal stability,stable cycle performance,and low room-temperature self-discharge rate.However,LiFePO_(4)-based battery applications are seriously limited when they are operated in a cold climate.This outcome is due to a considerable decrease in Li+transport capabilities within the elec-trode,particularly leading to a dramatic decrease in the electrochemical capacity and power performance of the electrolyte.Therefore,the design of low-temperature electrolytes is important for the further commercial application of LiFePO_(4) batteries.This paper reviews the key factors for the poor low-temperature performance of LiFePO_(4)-based batteries and the research progress of low-temperature electrolytes.Spe-cial attention is paid to electrolyte components,including lithium salts,cosolvents,additives,and the development of new electrolytes.The factors affecting the anode are also analyzed.Finally,according to the current research progress,some viewpoints are summarized to provide suitable modification methods and research suggestions for improving the practicability of LiFePO_(4)/C commercial batteries at low temperat-ures in the future.展开更多
OBJECTIVE Lychee seed,a famous traditional Chinese medicine,recently were reported to improve the learning and memory abilities in mice.However,it is still unclear whether lychee seed saponins(LSS)can improve the cogn...OBJECTIVE Lychee seed,a famous traditional Chinese medicine,recently were reported to improve the learning and memory abilities in mice.However,it is still unclear whether lychee seed saponins(LSS)can improve the cognitive function and associated mechanisms.METHODS In present studies,we established the Alzheimer disease(AD)model by injecting Aβ25-35 into the lateral ventricle of rats.Then the spatial learning and memory abilities of LSS-treated rats were evaluated with the Morris water maze,meanwhile the protein expressions of AKT,GSK3β and Tau in the hippocampal neuron were analyzed by immunohistochemistry and Western blotting.RESULTS The results showed LSS can improve the cognitive functions of AD rats through shortening the escape latency,increasing the number across the platform,platform quadrant dwell time and the percentage of the total distance run platform quadrant.The protein expression of AKT was significantly up-regulated and that of GSK3β and Tau were decreased remarkably in the hippocampal CA1 area.CONCLUSION Our study is the first to show that LSS significantly improve the cognitive function and prevent hippocampal neuronal injury of the rats with AD by activation of the PI3K/AKT/GSK3βsignaling pathway,suggesting LSS may be developed into the nutrient supplement for the treatment of AD.展开更多
To revitalize rural tourism and improve the quality of life of rural residents,the successful experience of rural tourism in South Korea is used for reference,with an important significance for promoting the developme...To revitalize rural tourism and improve the quality of life of rural residents,the successful experience of rural tourism in South Korea is used for reference,with an important significance for promoting the development of rural tourism in Tai'an City.In this paper,three successful rural tourism cases of South Korea(Shuchuan,Hannong Village,Xinli Mupianwa Village)are analyzed first,and their successful experience is summarized.On the basis of accurately grasping current situation and problems of rural tourism development in Tai'an City,the countermeasures of promoting the development of rural tourism in Tai'an City are proposed:mobilizing the enthusiasm of villagers,multi-channel access to funds,diversified talent cultivation methods,product marketing system,and rural tourism management system.展开更多
Isopimpinellin(C13H10O5),alternative name 5,8-dimethoxypsoralen,is one of the furocoumarin compounds.This traditional Chinese medicine extract has attracted a great deal of attention in recent years due to its pharmac...Isopimpinellin(C13H10O5),alternative name 5,8-dimethoxypsoralen,is one of the furocoumarin compounds.This traditional Chinese medicine extract has attracted a great deal of attention in recent years due to its pharmacological properties,especially its antifungal effect.The main purpose of this study was to study the molecular structure and chemical reactivity of isopimpinellin using the density functional theory method.To understand and interpret the reactivity of isopimpinellin,various chemical reactivity descriptors such as chemical potential(μ),electronegativity(χ),chemical hardness(η)and electrophilicity(ω)and local reactivity index condensed Fukui function(fi(r))have been calculated with five hybrid functionals PBE1PBE,MPW1PW91,B3LYP,X3LYP and B3PW91.These chemical reactivity descriptors indicate that the isopimpinellin molecule has a good antioxidant activity,which could be one of the reasons for its action as an effective antifungal drug.The condensed Fukui functions of isopimpinellin molecule provide a complete scheme of chemical reactivity of one molecule.展开更多
The MYB4 transcription factor family regulates plant traits.However,their overexpression often results in undesirable side effects like growth reduction.We have reported a green tea(Camellia sinensis)MYB4 transcriptio...The MYB4 transcription factor family regulates plant traits.However,their overexpression often results in undesirable side effects like growth reduction.We have reported a green tea(Camellia sinensis)MYB4 transcription factor(CsMYB4)that represses the phenylpropanoid and shikimate pathways and stunts plant growth and development.In the current study,we observed that in CsMYB4a transgenic tobacco(Nicotiana tabacum)plants,primary metabolism was altered,including sugar and amino acid metabolism,which demonstrated a pleiotropic regulation by CsMYB4a.The CsMYB4a transgenic tobacco plants had improved drought tolerance,which correlated to alterations in carbohydrate metabolism and an increase in proline content,as revealed by metabolic profiling and transcriptomic analysis.To mitigate the undesirable repressive side effects on plant traits,including dwarfism,shrunken leaves,and shorter roots of CsMYB4a transgenic plants,we deleted the C4 domain of CsMYB4a to obtain a CsMYB4a-DC4 variant and then overexpressed it in transgenic plants(CsMYB4a-DC4).These CsMYB4a-DC4 plants displayed a normal growth and had improved drought tolerance.Metabolite analysis demonstrated that the contents of carbohydrates and proline were increased in these transgenic plants.Our findings suggest that an approriate modification of TFs can generate novel crop traits,thus providing potential agricultural benefits and expanding its application to various crops.展开更多
Publisher Correction:aBIOTECH https://doi.org/10.1007/s42994-024-00149-5 The original article has been updated to correct two errors introduced during production:In this article Xiu Li the same as Mingzhuo Li and Guol...Publisher Correction:aBIOTECH https://doi.org/10.1007/s42994-024-00149-5 The original article has been updated to correct two errors introduced during production:In this article Xiu Li the same as Mingzhuo Li and Guoliang Ma should have been denoted as equally contributing authors.展开更多
The initial cell search plays an important role during the process of downlink synchronization establishment between the User Equipment(UE) and the base station. In particular, the uncertainty of the synchronization s...The initial cell search plays an important role during the process of downlink synchronization establishment between the User Equipment(UE) and the base station. In particular, the uncertainty of the synchronization signals on the frequency domain and the flexibility of frame structure configuration have brought great challenges to the initial cell search for the fifth-generation(5G) new radio(NR). To solve this problem, firstly, we analyze the physical layer frame structure of 5G NR systems. Then, by focusing on the knowledge of synchronization signals, the 5G NR cell search process is designed, and the primary synchronization signal(PSS) timing synchronization algorithm is proposed, including a 5G-based coarse synchronization algorithm and conjugate symmetry-based fine synchronization algorithm. Finally, the performance of the proposed cell search algorithm in 5G NR systems is verified through the combination of Digital Signal Processing(DSP) and personal computer(PC). And the MATLAB simulation proves that the proposed algorithm has better performance than the conventional cross-correlation algorithm when a certain frequency offset exists.展开更多
Lithium-iron manganese phosphates(LiFex Mn_(1-x)PO_(4),0.1<x<0.9)have the merits of high safety and high working voltage.However,they also face the challenges of insufficient conductivity and poor cycling stabil...Lithium-iron manganese phosphates(LiFex Mn_(1-x)PO_(4),0.1<x<0.9)have the merits of high safety and high working voltage.However,they also face the challenges of insufficient conductivity and poor cycling stability.Some progress has been achieved to solve these problems.Herein,we firstly summarized the influence of different electrolyte systems on the electrochemical performance of LiFexMn_(1-x)PO_(4),and then discussed the effect of element doping,lastly studied the influences of conductive layer coating and morphology control on the cycling stability.Finally,the prospects and challenges of developing high-cycling LiFexMn_(1-x)PO_(4) were proposed.展开更多
Nickel-rich LiNi_(0.8)Co_(0.1)Mn_(0.1)O_(2)(NCM811)is regarded as the promising cathode for lithium-ion batteries(LIBs).However,the challenges such as safety issues and poor cycling performance have seriously hindered...Nickel-rich LiNi_(0.8)Co_(0.1)Mn_(0.1)O_(2)(NCM811)is regarded as the promising cathode for lithium-ion batteries(LIBs).However,the challenges such as safety issues and poor cycling performance have seriously hindered its commercial applications.In order to overcome these difficulties,there has been extensive research and development of electrolyte modifications for high-energy-density LIBs with Ni-rich cathodes.Herein,this review introduces the research progress based on solvent additives,salt type additives and other electrolytes for LIBs with NCM811cathode materials and discusses how they control the interface stability.In particular,some recommendations for further modification of enhancing electrolyte stability and improving NCM811 electrochemical properties are summarized and proposed,which put forward new design rules for the screening and customizing ideal electrolyte additives for high performance NCM811 cathode-based LIBs.展开更多
In order to explore the relationship between social capital and rural tourism development effect and improve the development of rural tourism,this study takes Liutai Village in Shandong Province,9 villages of Mangxin ...In order to explore the relationship between social capital and rural tourism development effect and improve the development of rural tourism,this study takes Liutai Village in Shandong Province,9 villages of Mangxin Township and Yuanyi Village in Xinjiang as examples and conducts empirical research.The result of exploratory factor analysis shows that social capital is divided into bonding type and bridging type,which have different characteristics and functions.The result of multiple regression analysis shows that social capital of both the two types has a significant positive impact on the development of rural tourism.In the current process of rural tourism development,the positive influence of bonding social capital is greater than that of bridging social capital.Based on the results of the empirical analysis,this paper puts forward the countermeasures and suggestions for the development of rural tourism.展开更多
Based on Bloom's taxonomy of educational objectives,this paper puts forward the construction of curriculum system in the primary stage,intermediate stage and advanced stage by promoting teaching using competition,...Based on Bloom's taxonomy of educational objectives,this paper puts forward the construction of curriculum system in the primary stage,intermediate stage and advanced stage by promoting teaching using competition,and provides a theoretical and practical basis for the curriculum construction by promoting teaching using competition,which is of great practical significance to promoting the construction of applied universities.展开更多
Combining current situations of Chinese herbal medicine planting industry in Shandong,in line with existing problems of Chinese herbal medicine planting industry,this paper analyzed development prospect of tourist com...Combining current situations of Chinese herbal medicine planting industry in Shandong,in line with existing problems of Chinese herbal medicine planting industry,this paper analyzed development prospect of tourist commodity industry in Shandong Province,and came up with actual selection and recommendations for integrated development of Chinese herbal medicine planting and tourist commodities.展开更多
With intermittence and stochastics of wind power largely introduced into power systems, power system stability analysis and control is in urgent need of reliable wind farm models. Considering the superiority of wide-a...With intermittence and stochastics of wind power largely introduced into power systems, power system stability analysis and control is in urgent need of reliable wind farm models. Considering the superiority of wide-area measurement systems, this paper develops a novel methodology for practical synchrophasor measurement-based modeling and parameter identification of wind farms. For the sake of preserving basic structural characteristics and control patterns simultaneously, a comprehensive wind farm model is constructed elaborately. To improve the efficiency of the identification procedure,dominant parameters are classified and selected by trajectory sensitivity analysis. Furthermore, an improved genetic algorithm is proposed to strengthen the capability of global optimization. The test results on the WECC benchmark system and the CEPRI 36-bus system demonstrate the effectiveness and reliability of the proposed modeling and identification methodology.展开更多
Li metal batteries(LMBs) are considered as the next-generation energy storage systems because of their high energy density.However,due to the high reactivity of Li metal with the electrolyte,the unwanted safety concer...Li metal batteries(LMBs) are considered as the next-generation energy storage systems because of their high energy density.However,due to the high reactivity of Li metal with the electrolyte,the unwanted safety concerns inhibit the practical application of LMBs.To overcome these drawbacks,exploring suitable electrolytes is considered to be urgent.Great effort has been made to modify electrolytes to achieve the stability of LMBs.In this review,different kinds of LMBs are firstly introduced.Then,the regulation of electrode–electrolyte interphase is discussed.Next,recent advances on the functional electrolytes for LMBs are overviewed,including fireproof electrolytes,extreme-temperature electrolytes and high-voltage electrolytes.Finally,the perspective on the development of future electrolytes is provided.展开更多
基金supported by the National Natural Science Foundation of China(No.51802163)the Natural Science Foundation of Henan Province of China(No.222300420252)the Natural Science Foundation of Henan Department of Education(No.20A480004).
文摘Orthorhombic Nb_(2)O_(5)(T-Nb_(2)O_(5))is attractive for fast-charging Li-ion batteries,but it is still hard to realize rapid charge transfer kinetics for Li-ion storage.Herein,F-doped T-Nb_(2)O_(5) microflowers(F-Nb_(2)O_(5))are rationally synthesized through topotactic conversion.Specifically,F-Nb_(2)O_(5) are assembled by single-crystal nanoflakes with nearly 97%exposed(100)facet,which maximizes the exposure of the feasible Li^(+)transport pathways along loosely packed 4g atomic layers to the electrolytes,thus effectively enhancing the Li^(+)-intercalation performance.Besides,the band gap of F-Nb_(2)O_(5) is reduced to 2.87 eV due to the doping of F atoms,leading to enhanced electrical conductivity.The synergetic effects between tailored exposed crystal facets,F-doping,and ultrathin building blocks,speed up the Li^(+)/electron transfer kinetics and improve the pseudocapacitive properties of F-Nb_(2)O_(5).Therefore,F-Nb_(2)O_(5) exhibit superior rate capability(210.8 and 164.9 mAh g^(-1) at 1 and 10 C,respectively)and good long-term 10 C cycling performance(132.7 mAh g^(-1) after 1500 cycles).
基金supported by the National Natural Science Foundation of China (No. 52102470)Guangxi Innovation Driven Development Project (No. AA17204100)
文摘The olivine-type lithium iron phosphate(LiFePO_(4))cathode material is promising and widely used as a high-performance lithium-ion battery cathode material in commercial batteries due to its low cost,environmental friendliness,and high safety.At present,LiFePO_(4)/C sec-ondary batteries are widely used for electronic products,automotive power batteries,and other occasion-related applications with good thermal stability,stable cycle performance,and low room-temperature self-discharge rate.However,LiFePO_(4)-based battery applications are seriously limited when they are operated in a cold climate.This outcome is due to a considerable decrease in Li+transport capabilities within the elec-trode,particularly leading to a dramatic decrease in the electrochemical capacity and power performance of the electrolyte.Therefore,the design of low-temperature electrolytes is important for the further commercial application of LiFePO_(4) batteries.This paper reviews the key factors for the poor low-temperature performance of LiFePO_(4)-based batteries and the research progress of low-temperature electrolytes.Spe-cial attention is paid to electrolyte components,including lithium salts,cosolvents,additives,and the development of new electrolytes.The factors affecting the anode are also analyzed.Finally,according to the current research progress,some viewpoints are summarized to provide suitable modification methods and research suggestions for improving the practicability of LiFePO_(4)/C commercial batteries at low temperat-ures in the future.
基金supported by Science and Technology Planning Project of Sichuan Province(2008SZ0050,14JC0798)Educational Commission of Sichuan Province(10ZA035,15ZA0155)+1 种基金Science and Technology Program of Luzhou(2015-S-43,2016LZXNYD-T03)Key Development Program of Southwest Medical University(2010ZD-010)
文摘OBJECTIVE Lychee seed,a famous traditional Chinese medicine,recently were reported to improve the learning and memory abilities in mice.However,it is still unclear whether lychee seed saponins(LSS)can improve the cognitive function and associated mechanisms.METHODS In present studies,we established the Alzheimer disease(AD)model by injecting Aβ25-35 into the lateral ventricle of rats.Then the spatial learning and memory abilities of LSS-treated rats were evaluated with the Morris water maze,meanwhile the protein expressions of AKT,GSK3β and Tau in the hippocampal neuron were analyzed by immunohistochemistry and Western blotting.RESULTS The results showed LSS can improve the cognitive functions of AD rats through shortening the escape latency,increasing the number across the platform,platform quadrant dwell time and the percentage of the total distance run platform quadrant.The protein expression of AKT was significantly up-regulated and that of GSK3β and Tau were decreased remarkably in the hippocampal CA1 area.CONCLUSION Our study is the first to show that LSS significantly improve the cognitive function and prevent hippocampal neuronal injury of the rats with AD by activation of the PI3K/AKT/GSK3βsignaling pathway,suggesting LSS may be developed into the nutrient supplement for the treatment of AD.
基金Talent Introduction and Education Program of Youth Innovation Team in Colleges and Universities of Shandong Province(201903)Research Project on Teaching Reform of Undergraduate Colleges and Universities in Shandong Province in 2020Key Subjects of Art and Science in Shandong Province in 2021(L2021Z07070505).
文摘To revitalize rural tourism and improve the quality of life of rural residents,the successful experience of rural tourism in South Korea is used for reference,with an important significance for promoting the development of rural tourism in Tai'an City.In this paper,three successful rural tourism cases of South Korea(Shuchuan,Hannong Village,Xinli Mupianwa Village)are analyzed first,and their successful experience is summarized.On the basis of accurately grasping current situation and problems of rural tourism development in Tai'an City,the countermeasures of promoting the development of rural tourism in Tai'an City are proposed:mobilizing the enthusiasm of villagers,multi-channel access to funds,diversified talent cultivation methods,product marketing system,and rural tourism management system.
文摘Isopimpinellin(C13H10O5),alternative name 5,8-dimethoxypsoralen,is one of the furocoumarin compounds.This traditional Chinese medicine extract has attracted a great deal of attention in recent years due to its pharmacological properties,especially its antifungal effect.The main purpose of this study was to study the molecular structure and chemical reactivity of isopimpinellin using the density functional theory method.To understand and interpret the reactivity of isopimpinellin,various chemical reactivity descriptors such as chemical potential(μ),electronegativity(χ),chemical hardness(η)and electrophilicity(ω)and local reactivity index condensed Fukui function(fi(r))have been calculated with five hybrid functionals PBE1PBE,MPW1PW91,B3LYP,X3LYP and B3PW91.These chemical reactivity descriptors indicate that the isopimpinellin molecule has a good antioxidant activity,which could be one of the reasons for its action as an effective antifungal drug.The condensed Fukui functions of isopimpinellin molecule provide a complete scheme of chemical reactivity of one molecule.
基金Natural Science Foundation of China(Grant No.32372756,No 32072621)the National Science Basic Research Program of Shanxi(2022JQ-194)for supporting this research.
文摘The MYB4 transcription factor family regulates plant traits.However,their overexpression often results in undesirable side effects like growth reduction.We have reported a green tea(Camellia sinensis)MYB4 transcription factor(CsMYB4)that represses the phenylpropanoid and shikimate pathways and stunts plant growth and development.In the current study,we observed that in CsMYB4a transgenic tobacco(Nicotiana tabacum)plants,primary metabolism was altered,including sugar and amino acid metabolism,which demonstrated a pleiotropic regulation by CsMYB4a.The CsMYB4a transgenic tobacco plants had improved drought tolerance,which correlated to alterations in carbohydrate metabolism and an increase in proline content,as revealed by metabolic profiling and transcriptomic analysis.To mitigate the undesirable repressive side effects on plant traits,including dwarfism,shrunken leaves,and shorter roots of CsMYB4a transgenic plants,we deleted the C4 domain of CsMYB4a to obtain a CsMYB4a-DC4 variant and then overexpressed it in transgenic plants(CsMYB4a-DC4).These CsMYB4a-DC4 plants displayed a normal growth and had improved drought tolerance.Metabolite analysis demonstrated that the contents of carbohydrates and proline were increased in these transgenic plants.Our findings suggest that an approriate modification of TFs can generate novel crop traits,thus providing potential agricultural benefits and expanding its application to various crops.
文摘Publisher Correction:aBIOTECH https://doi.org/10.1007/s42994-024-00149-5 The original article has been updated to correct two errors introduced during production:In this article Xiu Li the same as Mingzhuo Li and Guoliang Ma should have been denoted as equally contributing authors.
基金partially the Chongqing Municipality’s Major Theme Project “R & D and Application of 5G terminal simulation equipment” (Grant No. Cstc2017zdcy-zdzx0030)
文摘The initial cell search plays an important role during the process of downlink synchronization establishment between the User Equipment(UE) and the base station. In particular, the uncertainty of the synchronization signals on the frequency domain and the flexibility of frame structure configuration have brought great challenges to the initial cell search for the fifth-generation(5G) new radio(NR). To solve this problem, firstly, we analyze the physical layer frame structure of 5G NR systems. Then, by focusing on the knowledge of synchronization signals, the 5G NR cell search process is designed, and the primary synchronization signal(PSS) timing synchronization algorithm is proposed, including a 5G-based coarse synchronization algorithm and conjugate symmetry-based fine synchronization algorithm. Finally, the performance of the proposed cell search algorithm in 5G NR systems is verified through the combination of Digital Signal Processing(DSP) and personal computer(PC). And the MATLAB simulation proves that the proposed algorithm has better performance than the conventional cross-correlation algorithm when a certain frequency offset exists.
基金financially supported by the National Natural Science Foundation of China(Nos.51971090 and U21A20311)。
文摘Lithium-iron manganese phosphates(LiFex Mn_(1-x)PO_(4),0.1<x<0.9)have the merits of high safety and high working voltage.However,they also face the challenges of insufficient conductivity and poor cycling stability.Some progress has been achieved to solve these problems.Herein,we firstly summarized the influence of different electrolyte systems on the electrochemical performance of LiFexMn_(1-x)PO_(4),and then discussed the effect of element doping,lastly studied the influences of conductive layer coating and morphology control on the cycling stability.Finally,the prospects and challenges of developing high-cycling LiFexMn_(1-x)PO_(4) were proposed.
基金financially supported by the National Natural Science Foundation of China(Nos.51971090,U21A20311)。
文摘Nickel-rich LiNi_(0.8)Co_(0.1)Mn_(0.1)O_(2)(NCM811)is regarded as the promising cathode for lithium-ion batteries(LIBs).However,the challenges such as safety issues and poor cycling performance have seriously hindered its commercial applications.In order to overcome these difficulties,there has been extensive research and development of electrolyte modifications for high-energy-density LIBs with Ni-rich cathodes.Herein,this review introduces the research progress based on solvent additives,salt type additives and other electrolytes for LIBs with NCM811cathode materials and discusses how they control the interface stability.In particular,some recommendations for further modification of enhancing electrolyte stability and improving NCM811 electrochemical properties are summarized and proposed,which put forward new design rules for the screening and customizing ideal electrolyte additives for high performance NCM811 cathode-based LIBs.
基金Humanistic&Social Science Research Project of Shandong Province(19-ZC-GL-02)Talent Introduction and Cultivation Program for Youth Innovation Teams of Colleges and Universities in Shandong Province+1 种基金Social Science Planning Project of Shandong Province:Digital Shandong Construction Project(20CSDJ62)Social Science Planning Project of Shandong Province:Special Project on Collaborative Innovation of Major Theoretical and Practical Issues(20CCXJ28).
文摘In order to explore the relationship between social capital and rural tourism development effect and improve the development of rural tourism,this study takes Liutai Village in Shandong Province,9 villages of Mangxin Township and Yuanyi Village in Xinjiang as examples and conducts empirical research.The result of exploratory factor analysis shows that social capital is divided into bonding type and bridging type,which have different characteristics and functions.The result of multiple regression analysis shows that social capital of both the two types has a significant positive impact on the development of rural tourism.In the current process of rural tourism development,the positive influence of bonding social capital is greater than that of bridging social capital.Based on the results of the empirical analysis,this paper puts forward the countermeasures and suggestions for the development of rural tourism.
基金Supported by the 12 th Teaching Reform and Research Project of Taishan University—"Talent Training Mode Optimization and Practical Research in National First-Class Major Tourism Management by Promoting Teaching Using Competition"(201934).
文摘Based on Bloom's taxonomy of educational objectives,this paper puts forward the construction of curriculum system in the primary stage,intermediate stage and advanced stage by promoting teaching using competition,and provides a theoretical and practical basis for the curriculum construction by promoting teaching using competition,which is of great practical significance to promoting the construction of applied universities.
基金Supported by Student Innovation Project of Shandong University of Traditional Chinese Medicine in 2014(2014047)
文摘Combining current situations of Chinese herbal medicine planting industry in Shandong,in line with existing problems of Chinese herbal medicine planting industry,this paper analyzed development prospect of tourist commodity industry in Shandong Province,and came up with actual selection and recommendations for integrated development of Chinese herbal medicine planting and tourist commodities.
基金supported by National Basic Research Program of China(No.2012CB215206)National Natural Science Foundation of China(No.51107061)
文摘With intermittence and stochastics of wind power largely introduced into power systems, power system stability analysis and control is in urgent need of reliable wind farm models. Considering the superiority of wide-area measurement systems, this paper develops a novel methodology for practical synchrophasor measurement-based modeling and parameter identification of wind farms. For the sake of preserving basic structural characteristics and control patterns simultaneously, a comprehensive wind farm model is constructed elaborately. To improve the efficiency of the identification procedure,dominant parameters are classified and selected by trajectory sensitivity analysis. Furthermore, an improved genetic algorithm is proposed to strengthen the capability of global optimization. The test results on the WECC benchmark system and the CEPRI 36-bus system demonstrate the effectiveness and reliability of the proposed modeling and identification methodology.
基金supported by the National Natural Science Foundation of China (51971090 and U21A20311)。
文摘Li metal batteries(LMBs) are considered as the next-generation energy storage systems because of their high energy density.However,due to the high reactivity of Li metal with the electrolyte,the unwanted safety concerns inhibit the practical application of LMBs.To overcome these drawbacks,exploring suitable electrolytes is considered to be urgent.Great effort has been made to modify electrolytes to achieve the stability of LMBs.In this review,different kinds of LMBs are firstly introduced.Then,the regulation of electrode–electrolyte interphase is discussed.Next,recent advances on the functional electrolytes for LMBs are overviewed,including fireproof electrolytes,extreme-temperature electrolytes and high-voltage electrolytes.Finally,the perspective on the development of future electrolytes is provided.
