Raman spectroscopy offers a great power to detect,analyze and identify molecules,and monitor their temporal dynamics and evolution when combined with single-molecule surface-enhanced Raman scattering(SM-SERS)substrate...Raman spectroscopy offers a great power to detect,analyze and identify molecules,and monitor their temporal dynamics and evolution when combined with single-molecule surface-enhanced Raman scattering(SM-SERS)substrates.Here we present a SM-SERS scheme that involves simultaneously giant chemical enhancement from WS22D materials,giant electromagnetic enhancement from plasmonic nanogap hot spot,and inhibition of molecular fluorescence influence under near-infrared laser illumination.Remarkably we find Coulomb attraction between analyte and gold nanoparticle can trigger spontaneous formation of molecule-hotspot pairing with high precision,stability and robustness.The scheme has enabled realization of universal,robust,fast,and large-scale uniform SM-SERS detection for three Raman molecules of rhodamine B,rhodamine 6G,and crystal violet with a very low detection limit of 10−16 M and at a very fast spectrum acquisition time of 50 ms.展开更多
The search for photoactive materials that are able to efficiently produce solar fuels is a growing research field to tackle the current energy crisis.Herein,we have prepared two ionic non-noble metallo-supramolecular ...The search for photoactive materials that are able to efficiently produce solar fuels is a growing research field to tackle the current energy crisis.Herein,we have prepared two ionic non-noble metallo-supramolecular polymers Se-MTpy(M=Co or Ni),and constructed their composites with single-walled carbon nanotubes(CNTs)via electrostatic attraction andπ-πinteractions for efficient and stable photocatalytic hydrogen evolution.In the photocatalytic system,the cationic Se-MTpy as host and anionic CNTs as vip are assembled into a binary composite,which exhibits superior photocatalytic activity under visible light irradiation(>420 nm).The optimized CNT@Se-CoTpy composite,containing 1.2 wt%metal loading,achieves 7 times higher hydrogen evolution rate(2.47 mmol g^(-1)h^(-1))than bare Se-CoTpy(0.35 mmol g^(-1)h^(-1)).This is attributed to the constructive formation of junctions between polymer and CNTs,facilitating interfacial charge transfer and transport for efficient proton reduction.The composite system also shows high photostability after continuous irradiation for~30 h.The combination of experimental and theoretical analysis demonstrates the higher activity for reducing H_(2)O to H_(2)of Se-CoTpy than Se-NiTpy.The feasible interfacial architecture proposed in this study represents an effective approach to achieve high photocatalytic performance.展开更多
The development of nanomedicine that can be efficiently internalized by drug-resistant cancer cells still presents a daunting challenge due to the low uptake capacity caused by various drug resistance-related factors ...The development of nanomedicine that can be efficiently internalized by drug-resistant cancer cells still presents a daunting challenge due to the low uptake capacity caused by various drug resistance-related factors on the cell membrane.Herein,we engineered the surfaces of glycan nanocarriers with negative,neutral,and gradient positive charges,and discovered that positively charged nanocarriers can be anchored onto the cell membrane through electrostatic attraction and thus be efficiently internalized by drug-resistant cancer cells.In contrast,drug-resistant cancer cells do not readily uptake neutral or negatively charged nanocarriers.By proposing a concentric ring fluorescence coefficient(CRFC),we were able to quantify the cell membrane anchoring capabilities of the nanocarriers and found that positively charged nanocarriers have a much stronger anchoring ability toward drug-resistant cell membranes than their neutral and negatively charged counterparts.Interestingly,with the increase of positive charge,the ability of the nanocarriers to become anchored onto cell membranes was further enhanced,thus confirming that electrostatic attraction plays a crucial role in the membrane-anchoring guided cellular uptake.The method of endowing nano-objects with this charge-attracting capability towards negatively charged cell membranes to drive membrane-anchoring mediated cellular uptake illustrates its potential as a universal strategy for engineering nanocarriers to promote the uptake of nanodrugs into drug-resistant cancer cells and thus improve the therapeutic effect.展开更多
Dynamical systems often exhibit multiple attractors representing significantly different functioning conditions.A global map of attraction basins can offer valuable guidance for stabilizing or transitioning system sta...Dynamical systems often exhibit multiple attractors representing significantly different functioning conditions.A global map of attraction basins can offer valuable guidance for stabilizing or transitioning system states.Such a map can be constructed without prior system knowledge by identifying attractors across a sufficient number of points in the state space.However,determining the attractor for each initial state can be a laborious task.Here,we tackle the challenge of reconstructing attraction basins using as few initial points as possible.In each iteration of our approach,informative points are selected through random seeding and are driven along the current classification boundary,promoting the eventual selection of points that are both diverse and enlightening.The results across various experimental dynamical systems demonstrate that our approach requires fewer points than baseline methods while achieving comparable mapping accuracy.Additionally,the reconstructed map allows us to accurately estimate the minimum escape distance required to transition the system state to a target basin.展开更多
In order to improve the competitiveness of smart tourist attractions in the tourism market,this paper selects a scenic spot in Shenyang and uses big data technology to predict the passenger flow of the scenic spot.Fir...In order to improve the competitiveness of smart tourist attractions in the tourism market,this paper selects a scenic spot in Shenyang and uses big data technology to predict the passenger flow of the scenic spot.Firstly,this paper introduces the big data-driven forecast model of scenic spot passenger flow.Based on the traditional autoregressive integral moving average model and artificial neural network model,it builds a big data analysis and forecast model.Through the analysis of data source,model building,scenic spot passenger flow accuracy,and modeling time comparison,it affirms the advantages of big data analysis in forecasting scenic spot passenger flow.Finally,it puts forward four commercial operation optimization strategies:adjusting the ticket pricing of scenic spots,upgrading the catering and accommodation services in scenic spots,planning and designing play projects,and formulating accurate scenic spot marketing strategies,in order to provide references for the optimization and upgrading of smart tourist attractions in the future.展开更多
Urban tourism is considered a complex system,and multiscale exploration of the organizational patterns of attraction networks has become a topical issue in urban tourism,so exploring the multiscale characteristics and...Urban tourism is considered a complex system,and multiscale exploration of the organizational patterns of attraction networks has become a topical issue in urban tourism,so exploring the multiscale characteristics and connection mechanisms of attraction networks is important for understanding the linkages between attractions and even the future destination planning.This paper uses geotagging data to compare the links between attractions in Beijing,China during four different periods:the pre-Olympic period(2004–2007),the Olympic Games and subsequent‘heat period’(2008–2013),the post-Olympic period(2014–2019),and the COVID-19(Corona Virus Disease 2019)pandemic period(2020–2021).The aim is to better understand the evolution and patterns of attraction networks at different scales in Beijing and to provide insights for tourism planning in the destination.The results show that the macro,meso-,and microscales network characteristics of attraction networks have inherent logical relationships that can explain the commonalities and differences in the development process of tourism networks.The macroscale attraction network degree Matthew effect is significant in the four different periods and exhibits a morphological monocentric structure,suggesting that new entrants are more likely to be associated with attractions that already have high value.The mesoscale links attractions according to the common purpose of tourists,and the results of the community segmentation of the attraction networks in the four different periods suggest that the functional polycentric structure describes their clustering effect,and the weak links between clusters result from attractions bound by incomplete information and distance,and the functional polycentric structure with a generally more efficient network of clusters.The pattern structure at the microscale reveals the topological transformation relationship of the regional collaboration pattern,and the attraction network structure in the four different periods has a very similar importance profile structure suggesting that the attraction network has the same construction rules and evolution mechanism,which aids in understanding the attraction network pattern at both macro and micro scales.Important approaches and practical implications for planners and managers are presented.展开更多
The focus of this study was to examine how different factors including gender of the person on Snapchat and Snapchat filter types (no filter vs. pretty filter vs. frown filter vs. dog filter vs. sponsored filter) infl...The focus of this study was to examine how different factors including gender of the person on Snapchat and Snapchat filter types (no filter vs. pretty filter vs. frown filter vs. dog filter vs. sponsored filter) influence social and physical attraction perception of a person. An experiment manipulating both factors was conducted (N = 226). Results showed female on Snapchat was rated significantly higher on both social and physical attraction than their male counterparts. The use of different types of Snapchat filters had a significant effect on social attraction, but not on physical attraction. Moreover, there was a significant interaction effect between gender of the person on Snapchat and the types of Snapchat filter used on the social attraction rating.展开更多
The phenomenon of electrical attraction and repulsion between charged particles is well known, and described mathematically by Coulomb’s Law, yet until now there has been no explanation for why this occurs. There has...The phenomenon of electrical attraction and repulsion between charged particles is well known, and described mathematically by Coulomb’s Law, yet until now there has been no explanation for why this occurs. There has been no mechanistic explanation that reveals what causes the charged particles to accelerate, either towards or away from each other. This paper gives a detailed explanation of the phenomena of electrical attraction and repulsion based on my previous work that determined the exact wave-function solutions for both the Electron and the Positron. It is revealed that the effects are caused by wave interactions between the wave functions that result in Electromagnetic reflections of parts of the particle’s wave functions, causing a change in their momenta.展开更多
The mechanics of Coulomb attraction and repulsion between charged particles are not currently understood but can be explained using a photon-pair aether. A spin-2 photon pair with no net E or B fields can freely penet...The mechanics of Coulomb attraction and repulsion between charged particles are not currently understood but can be explained using a photon-pair aether. A spin-2 photon pair with no net E or B fields can freely penetrate deep into matter. It may collide with a charged particle and be transformed through the interaction into a spin-0 photon pair. This outflow of spin-0 photon pairs forms a homogeneous (+E) or (−E) electrostatic field around the particle, depending on its charge. Charged particles in the vicinity of each other experience an asymmetry in the incoming field, from which attraction or repulsion arises. Repulsion or attraction is understood as the transfer of momentum from photons to particles, which results in the appearance of a force.展开更多
Enormous progresses to understand the jamming transition have been driven via simulating purely repulsive particles which were somehow idealized in the past two decades. While the attractive systems are both theoretic...Enormous progresses to understand the jamming transition have been driven via simulating purely repulsive particles which were somehow idealized in the past two decades. While the attractive systems are both theoretical and practical compared with repulsive systems. By studying the statistics of rigid clusters, we find that the critical packing fraction φ_(c) varies linearly with attraction μ for different system sizes when the range of attraction is short. While for systems with long-range attractions, however, the slope of φ_(c) appears significantly different, which means that there are two distinct jamming scenarios. In this paper, we focus our main attention on short-range attractions scenario and define a new quantity named "short-range attraction susceptibility" χ_(p), which describes the degree of response of the probability of finding jammed states pjto short-range attraction strength μ. Our central results are that χ_(p) diverges in the thermodynamic limit as χ_(p) ∝|φ-φ_(c)^(∞)|^(-γ_(p)), where φ_(c)^(∞) is the packing fraction at the jamming transition for the infinite system in the absence of attraction. χ_(p) obeys scaling collapse with a scaling function in both two and three dimensions, illuminating that the jamming transition can be considered as a phase transition as proposed in previous work.展开更多
Modeling research and empirical study on the attraction of tourism destinations were conducted from 6 aspects,i.e.quality and scale of tourism resources,economic environment of tourism destinations,policy environment,...Modeling research and empirical study on the attraction of tourism destinations were conducted from 6 aspects,i.e.quality and scale of tourism resources,economic environment of tourism destinations,policy environment,accessibility,income level of tourist source areas as well as distance between tourist source area and tourism destination.展开更多
In order to improve the management level of heritage tourist attractions and achieve their sustainable development,a comparative study has been conducted on the management mode of heritage tourist attractions in China...In order to improve the management level of heritage tourist attractions and achieve their sustainable development,a comparative study has been conducted on the management mode of heritage tourist attractions in China and foreign countries from the perspective of management foundation,management objects and management resources.Then,suggestions have been proposed from the ideology and supervision mechanism,including improving ideology,upgrading management system,completing supervision mechanism and adopting international management mode.Particularly,the paper has pointed out that it should find the best management mode based on different social and economic backgrounds of the countries of heritage tourist attractions.展开更多
[Objective] This study was to determine the effect of green biological feeds that little affected natural environment on fish attraction activities with the aim to explore new research direction for the recreational f...[Objective] This study was to determine the effect of green biological feeds that little affected natural environment on fish attraction activities with the aim to explore new research direction for the recreational fishing area. [Method] The ef- fective constituents of live natural foods, including chironomid larvae, earthworm, mussels, winkles, were separated by using soaking solution extraction and centrifu- gal extraction. The extracted live foods were used to attract the carp, young cru- cian, and fishes of 100-150 days old and over 1 year old, respectively. The feed nutrition formulation of the added food attractants was designed and applied to feed- ing in the aquaculture farm. The test results were practised in bait study to conduct field fishing test and collect the data. [Results] Compared with the control group, feeding with live foods had significantly improved the growth rates of fishes at dif- ferent ages, and greatly reduced food coefficients. [Conclusion] The feeds made from live food addictives had excellent attraction ability, which not only reduced the negative effects on natural environment but also made the aquaculture mode more organic and greener.展开更多
As a promising technique to enhance the spatial reso- lution of remote sensing imagery, sub-pixel mapping is processed based on the spatial dependence theory with the assumption that the land cover is spatially depend...As a promising technique to enhance the spatial reso- lution of remote sensing imagery, sub-pixel mapping is processed based on the spatial dependence theory with the assumption that the land cover is spatially dependent both within pixels and be- tween them. The spatial attraction is used as a tool to describe the dependence. First, the spatial attractions between pixels, sub- pixel/pixel spatial attraction model （SPSAM）, are described by the modified SPSAM （MSPSAM） that estimates the attractions accord- ing to the distribution of sub-pixels within neighboring pixels. Then a mixed spatial attraction model （MSAM） for sub-pixel mapping is proposed that integrates the spatial attractions both within pix- els and between them. According to the expression of the MSAM maximumising the spatial attraction, the genetic algorithm is em- ployed to search the optimum solution and generate the sub-pixel mapping results. Experiments show that compared with SPSAM, MSPSAM and pixel swapping algorithm modified by initialization from SPSAM （MPS）, MSAM can provide higher accuracy and more rational sub-pixel mapping results.展开更多
By using geography quantitative methods and Arc GIS,the spatial distribution characteristics,types,rules and influencing factors of 20 representative rural tourism attractions in Yangzhou City were analyzed.The result...By using geography quantitative methods and Arc GIS,the spatial distribution characteristics,types,rules and influencing factors of 20 representative rural tourism attractions in Yangzhou City were analyzed.The results show that the traffic accessibility of various regions in Yangzhou City correlated positively with the spacial distribution of rural tourist attractions in quantity in these regions.The rural tourist attractions were dense in regions 10-20 km away from the center of the city;there was only one rural tourist attraction in regions 40-70 km away from the center of the city;some big rural tourist attractions were distributed in regions 70-90 km away from the center of the city;market orientation influenced the spatial distribution of the rural tourist attractions obviously.In regions 0-30 km away from the center of the city,most rural tourist attractions mainly provided recreation and entertainment services for tourists;in regions more than 70 km away from the center of the city,most rural tourist attractions mainly provided health and recuperation services for tourists;in regions 30-50 km away from the center of the city,the service functions of the rural tourist attractions were compound and diversified.展开更多
The cooperative electrostatic attraction and π-π aromatic stacking interactions between tetrahedral tetrapyridinium TP and three tetraanionic tetraphenylethylene derivatives TPE-1～3 led to the formation of a new ki...The cooperative electrostatic attraction and π-π aromatic stacking interactions between tetrahedral tetrapyridinium TP and three tetraanionic tetraphenylethylene derivatives TPE-1～3 led to the formation of a new kind of supramolecular polymer networks in water, which have been confirmed by^1 H NMR,fluorescence, isothermal titration calorimetric(ITC) and dynamic light scattering(DLS) experiments. ITC studies show that the contributions of enthalpy and entropy were comparable, reflecting the importance of hydrophobicity in driving the intermolecular aromatic stacking. DLS experiments indicate that the linear supramolecular polymers formed by these tetratopic monomers further aggregated into networks of 10~2-nm size.展开更多
Leadership is a key issue in the study of collective behavior in social animals.Affiliation-leadership models predict that dyadic partner preferences based on grooming relationships or allianee formation positively af...Leadership is a key issue in the study of collective behavior in social animals.Affiliation-leadership models predict that dyadic partner preferences based on grooming relationships or allianee formation positively affect an in dividua I's decision to follow or support a con spec ific.In the case of many primate species,females without young infants are attracted to mother-infant dyads.However,the effects of mother-infant-female associations on affiliation-leadership models remain less clear.In free-rangi ng Tibeta n macaques Macaca thibetana,we used social network analysis to examine the importance of mother-inf a nt-adult female"social bridging eve nts as a predictor of who leads and who follows during group movement.Social bridging is a common behavior in Tibetan macaques and occurs whe n 2 adults,gen erally females,engage in coordinated in fa nt handling.Using eigenvector centrality coefficients of social bridging as a measure of social affiliation,we found that among lactating females,initiating bridging behavior with another female played a sign讦icant role in leadership success,with the assisting female following the mother during group movement.Among non lactati ng females,this was not the case.Our results in dicate that in fa nt attracti on can be a strong trigger in collective action and directing group movement in Tibetan macaques and provides benefits to mothers who require helpers and social support in order to ensure the safety of their infants.Our study provides new insights into the importance of the third-party effect in rethinking affiliation-leadership models in group-living animals.展开更多
The attraction domains of memory patterns and exponential convergence rate of the network trajectories to memory patterns for continuous feedback associative memory are estimated. These results can be used for evaluat...The attraction domains of memory patterns and exponential convergence rate of the network trajectories to memory patterns for continuous feedback associative memory are estimated. These results can be used for evaluation of error-correction capability and the synthesis procedures for continuous-time associative memory neural networks.展开更多
It is known that there is a force of repulsion (or attraction) between two similar (or dissimilar) charges and the laws governing these forces are well established in electrostatics. However, the exact mechanism and t...It is known that there is a force of repulsion (or attraction) between two similar (or dissimilar) charges and the laws governing these forces are well established in electrostatics. However, the exact mechanism and the origin for these forces are not known. The purpose of this investigation, therefore, is to reveal these aspects in the light of the presence of vibrating strings and lines of fields created by the negative (or positive) charge. The present approach strongly suggests that the force of repulsion is originated between two charges due to fields synchronized with vibrating strings. The Gauss symmetry seems to play a crucial role in these aspects.展开更多
The present study was conducted at the Faiz Chaman mango orchard, Multan to find out the attraction of mango hopper Idioscopus clypealis to sticky traps of different colors. The experiment was laid out in randomized c...The present study was conducted at the Faiz Chaman mango orchard, Multan to find out the attraction of mango hopper Idioscopus clypealis to sticky traps of different colors. The experiment was laid out in randomized complete block designed with three replications. The sticky traps were hung vertically with the branch/twig under the canopy of mango trees. Data were recorded under binocular stereoscope. Results indicated significant differences in the number of I. clypealis (adults) captured in the different colored sticky traps. Yellow color was found most attractive with a capture of highest number of adults of I. clypealis (11.53 adults/trap). While pink and purple colors were found less attractive. The peak population of mango hoppers was recorded at the 31.96°C during 25-April to 9-May. Yellow sticky traps were found most effective in trapping a considerably higher number of hoppers throughout the study period. Correlation analysis revealed a strong positive correlation between temperature and the mean number of I. clypealis adults. Population peaks of I. clypealis were recorded at temperatures >30°C, while at lower temperatures relatively low numbers of adults were recorded.展开更多
基金financial support from Science and Technology Project of Guangdong(2020B010190001)National Natural Science Foundation(12434016).
文摘Raman spectroscopy offers a great power to detect,analyze and identify molecules,and monitor their temporal dynamics and evolution when combined with single-molecule surface-enhanced Raman scattering(SM-SERS)substrates.Here we present a SM-SERS scheme that involves simultaneously giant chemical enhancement from WS22D materials,giant electromagnetic enhancement from plasmonic nanogap hot spot,and inhibition of molecular fluorescence influence under near-infrared laser illumination.Remarkably we find Coulomb attraction between analyte and gold nanoparticle can trigger spontaneous formation of molecule-hotspot pairing with high precision,stability and robustness.The scheme has enabled realization of universal,robust,fast,and large-scale uniform SM-SERS detection for three Raman molecules of rhodamine B,rhodamine 6G,and crystal violet with a very low detection limit of 10−16 M and at a very fast spectrum acquisition time of 50 ms.
基金supported by the RGC Senior Research Fellowship Scheme(Grant No.SRFS2021-5S01)the Hong Kong Research Grants Council(Grant No.PolyU 15307321)+2 种基金Research Institute for Smart Energy(CDAQ),Research Centre for Nanoscience and Nanotechnology(CE2H),Research Centre for Carbon-Strategic Catalysis(CE2L)Miss Clarea Au for the Endowed Professorship in Energy(Grant No.847S)National Natural Science Foundation of China(Grant No.62205277).
文摘The search for photoactive materials that are able to efficiently produce solar fuels is a growing research field to tackle the current energy crisis.Herein,we have prepared two ionic non-noble metallo-supramolecular polymers Se-MTpy(M=Co or Ni),and constructed their composites with single-walled carbon nanotubes(CNTs)via electrostatic attraction andπ-πinteractions for efficient and stable photocatalytic hydrogen evolution.In the photocatalytic system,the cationic Se-MTpy as host and anionic CNTs as vip are assembled into a binary composite,which exhibits superior photocatalytic activity under visible light irradiation(>420 nm).The optimized CNT@Se-CoTpy composite,containing 1.2 wt%metal loading,achieves 7 times higher hydrogen evolution rate(2.47 mmol g^(-1)h^(-1))than bare Se-CoTpy(0.35 mmol g^(-1)h^(-1)).This is attributed to the constructive formation of junctions between polymer and CNTs,facilitating interfacial charge transfer and transport for efficient proton reduction.The composite system also shows high photostability after continuous irradiation for~30 h.The combination of experimental and theoretical analysis demonstrates the higher activity for reducing H_(2)O to H_(2)of Se-CoTpy than Se-NiTpy.The feasible interfacial architecture proposed in this study represents an effective approach to achieve high photocatalytic performance.
基金the Shanghai Science and Technology Plan Project(No.25J22800600)the National Key R&D Program of China(No.2022YFE0100600)+4 种基金the National Natural Science Foundation of China(No.21871180)the Tracking Program for Professor of Special Appointment(Eastern Scholar)at the Shanghai Institutions of Higher Learning(No.SHDP201802)the Open Project of Translational Medicine of Shanghai Jiao Tong University(Nos.TMSK-2021-108,and TMSK-2021-305)STAR Program of Shanghai Jiao Tong University(No.20240303)Shanghai Jiao Tong University 2030 Initiative.The authors also wish to thank the Instrumental Analysis Center(IAC)at Shanghai Jiao Tong University for providing measurements to support our experiments.
文摘The development of nanomedicine that can be efficiently internalized by drug-resistant cancer cells still presents a daunting challenge due to the low uptake capacity caused by various drug resistance-related factors on the cell membrane.Herein,we engineered the surfaces of glycan nanocarriers with negative,neutral,and gradient positive charges,and discovered that positively charged nanocarriers can be anchored onto the cell membrane through electrostatic attraction and thus be efficiently internalized by drug-resistant cancer cells.In contrast,drug-resistant cancer cells do not readily uptake neutral or negatively charged nanocarriers.By proposing a concentric ring fluorescence coefficient(CRFC),we were able to quantify the cell membrane anchoring capabilities of the nanocarriers and found that positively charged nanocarriers have a much stronger anchoring ability toward drug-resistant cell membranes than their neutral and negatively charged counterparts.Interestingly,with the increase of positive charge,the ability of the nanocarriers to become anchored onto cell membranes was further enhanced,thus confirming that electrostatic attraction plays a crucial role in the membrane-anchoring guided cellular uptake.The method of endowing nano-objects with this charge-attracting capability towards negatively charged cell membranes to drive membrane-anchoring mediated cellular uptake illustrates its potential as a universal strategy for engineering nanocarriers to promote the uptake of nanodrugs into drug-resistant cancer cells and thus improve the therapeutic effect.
基金supported by the National Natural Science Foundation of China(Grant Nos.T2225022,12350710786,62088101,and 12161141016)Shuguang Program of Shanghai Education Development Foundation(Grant No.22SG21)Shanghai Municipal Education Commission,and the Fundamental Research Funds for the Central Universities。
文摘Dynamical systems often exhibit multiple attractors representing significantly different functioning conditions.A global map of attraction basins can offer valuable guidance for stabilizing or transitioning system states.Such a map can be constructed without prior system knowledge by identifying attractors across a sufficient number of points in the state space.However,determining the attractor for each initial state can be a laborious task.Here,we tackle the challenge of reconstructing attraction basins using as few initial points as possible.In each iteration of our approach,informative points are selected through random seeding and are driven along the current classification boundary,promoting the eventual selection of points that are both diverse and enlightening.The results across various experimental dynamical systems demonstrate that our approach requires fewer points than baseline methods while achieving comparable mapping accuracy.Additionally,the reconstructed map allows us to accurately estimate the minimum escape distance required to transition the system state to a target basin.
文摘In order to improve the competitiveness of smart tourist attractions in the tourism market,this paper selects a scenic spot in Shenyang and uses big data technology to predict the passenger flow of the scenic spot.Firstly,this paper introduces the big data-driven forecast model of scenic spot passenger flow.Based on the traditional autoregressive integral moving average model and artificial neural network model,it builds a big data analysis and forecast model.Through the analysis of data source,model building,scenic spot passenger flow accuracy,and modeling time comparison,it affirms the advantages of big data analysis in forecasting scenic spot passenger flow.Finally,it puts forward four commercial operation optimization strategies:adjusting the ticket pricing of scenic spots,upgrading the catering and accommodation services in scenic spots,planning and designing play projects,and formulating accurate scenic spot marketing strategies,in order to provide references for the optimization and upgrading of smart tourist attractions in the future.
基金Under the auspices of the National Natural Science Foundation of China(No.41971202)the National Natural Science Foundation of China(No.42201181)the Fundamental research funding targets for central universities(No.2412022QD002)。
文摘Urban tourism is considered a complex system,and multiscale exploration of the organizational patterns of attraction networks has become a topical issue in urban tourism,so exploring the multiscale characteristics and connection mechanisms of attraction networks is important for understanding the linkages between attractions and even the future destination planning.This paper uses geotagging data to compare the links between attractions in Beijing,China during four different periods:the pre-Olympic period(2004–2007),the Olympic Games and subsequent‘heat period’(2008–2013),the post-Olympic period(2014–2019),and the COVID-19(Corona Virus Disease 2019)pandemic period(2020–2021).The aim is to better understand the evolution and patterns of attraction networks at different scales in Beijing and to provide insights for tourism planning in the destination.The results show that the macro,meso-,and microscales network characteristics of attraction networks have inherent logical relationships that can explain the commonalities and differences in the development process of tourism networks.The macroscale attraction network degree Matthew effect is significant in the four different periods and exhibits a morphological monocentric structure,suggesting that new entrants are more likely to be associated with attractions that already have high value.The mesoscale links attractions according to the common purpose of tourists,and the results of the community segmentation of the attraction networks in the four different periods suggest that the functional polycentric structure describes their clustering effect,and the weak links between clusters result from attractions bound by incomplete information and distance,and the functional polycentric structure with a generally more efficient network of clusters.The pattern structure at the microscale reveals the topological transformation relationship of the regional collaboration pattern,and the attraction network structure in the four different periods has a very similar importance profile structure suggesting that the attraction network has the same construction rules and evolution mechanism,which aids in understanding the attraction network pattern at both macro and micro scales.Important approaches and practical implications for planners and managers are presented.
文摘The focus of this study was to examine how different factors including gender of the person on Snapchat and Snapchat filter types (no filter vs. pretty filter vs. frown filter vs. dog filter vs. sponsored filter) influence social and physical attraction perception of a person. An experiment manipulating both factors was conducted (N = 226). Results showed female on Snapchat was rated significantly higher on both social and physical attraction than their male counterparts. The use of different types of Snapchat filters had a significant effect on social attraction, but not on physical attraction. Moreover, there was a significant interaction effect between gender of the person on Snapchat and the types of Snapchat filter used on the social attraction rating.
文摘The phenomenon of electrical attraction and repulsion between charged particles is well known, and described mathematically by Coulomb’s Law, yet until now there has been no explanation for why this occurs. There has been no mechanistic explanation that reveals what causes the charged particles to accelerate, either towards or away from each other. This paper gives a detailed explanation of the phenomena of electrical attraction and repulsion based on my previous work that determined the exact wave-function solutions for both the Electron and the Positron. It is revealed that the effects are caused by wave interactions between the wave functions that result in Electromagnetic reflections of parts of the particle’s wave functions, causing a change in their momenta.
文摘The mechanics of Coulomb attraction and repulsion between charged particles are not currently understood but can be explained using a photon-pair aether. A spin-2 photon pair with no net E or B fields can freely penetrate deep into matter. It may collide with a charged particle and be transformed through the interaction into a spin-0 photon pair. This outflow of spin-0 photon pairs forms a homogeneous (+E) or (−E) electrostatic field around the particle, depending on its charge. Charged particles in the vicinity of each other experience an asymmetry in the incoming field, from which attraction or repulsion arises. Repulsion or attraction is understood as the transfer of momentum from photons to particles, which results in the appearance of a force.
基金supported by the National Natural Science Foundation of China (Grant No. 11702289)Key Core Technology and Generic Technology Research and Development Project of Shanxi Province,China (Grant No. 2020XXX013)the National Key Research and Development Project of China。
文摘Enormous progresses to understand the jamming transition have been driven via simulating purely repulsive particles which were somehow idealized in the past two decades. While the attractive systems are both theoretical and practical compared with repulsive systems. By studying the statistics of rigid clusters, we find that the critical packing fraction φ_(c) varies linearly with attraction μ for different system sizes when the range of attraction is short. While for systems with long-range attractions, however, the slope of φ_(c) appears significantly different, which means that there are two distinct jamming scenarios. In this paper, we focus our main attention on short-range attractions scenario and define a new quantity named "short-range attraction susceptibility" χ_(p), which describes the degree of response of the probability of finding jammed states pjto short-range attraction strength μ. Our central results are that χ_(p) diverges in the thermodynamic limit as χ_(p) ∝|φ-φ_(c)^(∞)|^(-γ_(p)), where φ_(c)^(∞) is the packing fraction at the jamming transition for the infinite system in the absence of attraction. χ_(p) obeys scaling collapse with a scaling function in both two and three dimensions, illuminating that the jamming transition can be considered as a phase transition as proposed in previous work.
文摘Modeling research and empirical study on the attraction of tourism destinations were conducted from 6 aspects,i.e.quality and scale of tourism resources,economic environment of tourism destinations,policy environment,accessibility,income level of tourist source areas as well as distance between tourist source area and tourism destination.
文摘In order to improve the management level of heritage tourist attractions and achieve their sustainable development,a comparative study has been conducted on the management mode of heritage tourist attractions in China and foreign countries from the perspective of management foundation,management objects and management resources.Then,suggestions have been proposed from the ideology and supervision mechanism,including improving ideology,upgrading management system,completing supervision mechanism and adopting international management mode.Particularly,the paper has pointed out that it should find the best management mode based on different social and economic backgrounds of the countries of heritage tourist attractions.
文摘[Objective] This study was to determine the effect of green biological feeds that little affected natural environment on fish attraction activities with the aim to explore new research direction for the recreational fishing area. [Method] The ef- fective constituents of live natural foods, including chironomid larvae, earthworm, mussels, winkles, were separated by using soaking solution extraction and centrifu- gal extraction. The extracted live foods were used to attract the carp, young cru- cian, and fishes of 100-150 days old and over 1 year old, respectively. The feed nutrition formulation of the added food attractants was designed and applied to feed- ing in the aquaculture farm. The test results were practised in bait study to conduct field fishing test and collect the data. [Results] Compared with the control group, feeding with live foods had significantly improved the growth rates of fishes at dif- ferent ages, and greatly reduced food coefficients. [Conclusion] The feeds made from live food addictives had excellent attraction ability, which not only reduced the negative effects on natural environment but also made the aquaculture mode more organic and greener.
基金supported by the National Natural Science Foundation of China (60802059)the Foundation for the Doctoral Program of Higher Education of China (200802171003)
文摘As a promising technique to enhance the spatial reso- lution of remote sensing imagery, sub-pixel mapping is processed based on the spatial dependence theory with the assumption that the land cover is spatially dependent both within pixels and be- tween them. The spatial attraction is used as a tool to describe the dependence. First, the spatial attractions between pixels, sub- pixel/pixel spatial attraction model （SPSAM）, are described by the modified SPSAM （MSPSAM） that estimates the attractions accord- ing to the distribution of sub-pixels within neighboring pixels. Then a mixed spatial attraction model （MSAM） for sub-pixel mapping is proposed that integrates the spatial attractions both within pix- els and between them. According to the expression of the MSAM maximumising the spatial attraction, the genetic algorithm is em- ployed to search the optimum solution and generate the sub-pixel mapping results. Experiments show that compared with SPSAM, MSPSAM and pixel swapping algorithm modified by initialization from SPSAM （MPS）, MSAM can provide higher accuracy and more rational sub-pixel mapping results.
基金Sponsored by Science Foundation for Young Scholars of Hunan Agricultural University(14QN25)
文摘By using geography quantitative methods and Arc GIS,the spatial distribution characteristics,types,rules and influencing factors of 20 representative rural tourism attractions in Yangzhou City were analyzed.The results show that the traffic accessibility of various regions in Yangzhou City correlated positively with the spacial distribution of rural tourist attractions in quantity in these regions.The rural tourist attractions were dense in regions 10-20 km away from the center of the city;there was only one rural tourist attraction in regions 40-70 km away from the center of the city;some big rural tourist attractions were distributed in regions 70-90 km away from the center of the city;market orientation influenced the spatial distribution of the rural tourist attractions obviously.In regions 0-30 km away from the center of the city,most rural tourist attractions mainly provided recreation and entertainment services for tourists;in regions more than 70 km away from the center of the city,most rural tourist attractions mainly provided health and recuperation services for tourists;in regions 30-50 km away from the center of the city,the service functions of the rural tourist attractions were compound and diversified.
基金National Natural Science Foundation of China (Nos. 21432004 and 21472023) for financial support
文摘The cooperative electrostatic attraction and π-π aromatic stacking interactions between tetrahedral tetrapyridinium TP and three tetraanionic tetraphenylethylene derivatives TPE-1～3 led to the formation of a new kind of supramolecular polymer networks in water, which have been confirmed by^1 H NMR,fluorescence, isothermal titration calorimetric(ITC) and dynamic light scattering(DLS) experiments. ITC studies show that the contributions of enthalpy and entropy were comparable, reflecting the importance of hydrophobicity in driving the intermolecular aromatic stacking. DLS experiments indicate that the linear supramolecular polymers formed by these tetratopic monomers further aggregated into networks of 10~2-nm size.
基金This work was funded by the Natural Science Foundation of China(Grant No.31801983,31971404,31772475,31372215)the Initial Foundation of Doctoral Scientific Research(Y040418135)the Program of Outstanding Young Teachers Training(Z010139011)in Anhui University,and China Scholarship Council.R.C.K.'s effort was supported in part by the Office of Research Infrastructure Programs(ORIP)of the National Institutes of Health(NIH)through Grant Number P5IODO 10425 to the Washington National Primate Research Center.
文摘Leadership is a key issue in the study of collective behavior in social animals.Affiliation-leadership models predict that dyadic partner preferences based on grooming relationships or allianee formation positively affect an in dividua I's decision to follow or support a con spec ific.In the case of many primate species,females without young infants are attracted to mother-infant dyads.However,the effects of mother-infant-female associations on affiliation-leadership models remain less clear.In free-rangi ng Tibeta n macaques Macaca thibetana,we used social network analysis to examine the importance of mother-inf a nt-adult female"social bridging eve nts as a predictor of who leads and who follows during group movement.Social bridging is a common behavior in Tibetan macaques and occurs whe n 2 adults,gen erally females,engage in coordinated in fa nt handling.Using eigenvector centrality coefficients of social bridging as a measure of social affiliation,we found that among lactating females,initiating bridging behavior with another female played a sign讦icant role in leadership success,with the assisting female following the mother during group movement.Among non lactati ng females,this was not the case.Our results in dicate that in fa nt attracti on can be a strong trigger in collective action and directing group movement in Tibetan macaques and provides benefits to mothers who require helpers and social support in order to ensure the safety of their infants.Our study provides new insights into the importance of the third-party effect in rethinking affiliation-leadership models in group-living animals.
基金Supported by the National Natural Science Foundation of Chinathe Climb Project of China
文摘The attraction domains of memory patterns and exponential convergence rate of the network trajectories to memory patterns for continuous feedback associative memory are estimated. These results can be used for evaluation of error-correction capability and the synthesis procedures for continuous-time associative memory neural networks.
文摘It is known that there is a force of repulsion (or attraction) between two similar (or dissimilar) charges and the laws governing these forces are well established in electrostatics. However, the exact mechanism and the origin for these forces are not known. The purpose of this investigation, therefore, is to reveal these aspects in the light of the presence of vibrating strings and lines of fields created by the negative (or positive) charge. The present approach strongly suggests that the force of repulsion is originated between two charges due to fields synchronized with vibrating strings. The Gauss symmetry seems to play a crucial role in these aspects.
文摘The present study was conducted at the Faiz Chaman mango orchard, Multan to find out the attraction of mango hopper Idioscopus clypealis to sticky traps of different colors. The experiment was laid out in randomized complete block designed with three replications. The sticky traps were hung vertically with the branch/twig under the canopy of mango trees. Data were recorded under binocular stereoscope. Results indicated significant differences in the number of I. clypealis (adults) captured in the different colored sticky traps. Yellow color was found most attractive with a capture of highest number of adults of I. clypealis (11.53 adults/trap). While pink and purple colors were found less attractive. The peak population of mango hoppers was recorded at the 31.96°C during 25-April to 9-May. Yellow sticky traps were found most effective in trapping a considerably higher number of hoppers throughout the study period. Correlation analysis revealed a strong positive correlation between temperature and the mean number of I. clypealis adults. Population peaks of I. clypealis were recorded at temperatures >30°C, while at lower temperatures relatively low numbers of adults were recorded.
