Attractabilities of different diets and dietary selectivity of Chinese shrimp, Fenneropenaeus chinensis were studied through behavior observation and feeding experiment, respectively. The five diets used in the experi...Attractabilities of different diets and dietary selectivity of Chinese shrimp, Fenneropenaeus chinensis were studied through behavior observation and feeding experiment, respectively. The five diets used in the experiment are: Fish Flesh (FF), Shrimp Flesh (SF), Clam Foot (CF), Polychaete Worm (PW), and Formulated Diet (FD). No significant differ- ences of attractability exist between any two different diets when every two natural diets or all five diets are provided simul- taneously. On the other hand, significant differences of attractability exist between FD and every single natural diet when they are provided simultaneously. Results of behavioral observation indicate that natural diets are more attractive than FD. In feeding experiment, Chinese shrimp has distinct selectivity on different diets. It positively selects CF and PW, negatively selects FF and SF, and excludes FD absolutely. The results of the present studies indicate that the dietary selectivity of shrimp was based not only on the attractabilities of the diets, but also on the responses such as growth and food conversion.展开更多
Wide-bandgap two-dimensional (2D) β-TeO_(2) has been reported as a high-mobility p-type transparent semiconductor [Nat. Electron. 4 277 (2021)], attracting significant attention. This "breakthrough" not onl...Wide-bandgap two-dimensional (2D) β-TeO_(2) has been reported as a high-mobility p-type transparent semiconductor [Nat. Electron. 4 277 (2021)], attracting significant attention. This "breakthrough" not only challenges the conventional characterization of TeO_(2) as an insulator but also conflicts with the anticipated difficulty in hole doping of TeO_(2) by established chemical trends. Notably, the reported Fermi level of 0.9 eV above the valence band maximum actually suggests that the material is an insulator, contradicting the high hole density obtained by Hall effect measurement. Furthermore, the detected residual Se and the possible reduced elemental Te in the 2D β-TeO_(2) samples introduces complexity, considering that elemental Se, Te, and Te_(1−x)Se_(x) themselves are high-mobility p-type semiconductors. Therefore, doubts regarding the true cause of the p-type conductivity observed in the 2D β-TeO_(2) samples arise. In this Letter, we employ density functional theory calculations to illustrate that TeO_(2), whether in its bulk forms of α-, β-, or γ-TeO_(2), or in the 2D β-TeO_(2) nanosheets, inherently exhibits insulating properties and poses challenges in carrier doping due to its shallow conduction band minimum and deep valence band maximum. Our findings shed light on the insulating properties and doping difficulty of TeO_(2), contrasting with the claimed p-type conductivity in the 2D β-TeO_(2) samples, prompting inquiries into the true origin of the p-type conductivity.展开更多
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
It is one of the must-visit history museums,known for its vast collection of historical artifacts,attracting around three million domestic and international visitors each year.THE Shaanxi History Museum(SHM),in the re...It is one of the must-visit history museums,known for its vast collection of historical artifacts,attracting around three million domestic and international visitors each year.THE Shaanxi History Museum(SHM),in the renowned historic city of Xi’an in Shaanxi Province,is often regarded as one of the museums most difficult to get a ticket to in China.Each day,approximately 12,000 free online tickets are made available and are fully booked within just a couple of minutes.Its vast collection of treasured relics and numerous national treasures leave visitors in awe.展开更多
The fall armyworm(Spodoptera frugiperda)is an invasive species and a destructive pest of maize,which significantly impacts native species and communities via complex mechanisms like competition for resources.However,t...The fall armyworm(Spodoptera frugiperda)is an invasive species and a destructive pest of maize,which significantly impacts native species and communities via complex mechanisms like competition for resources.However,the interaction between S.frugiperda and local pests remains unclear.In this study,we determined that Oriental armyworm(Mythimna separata)females with different mating status displayed different approach-avoidance behaviors towards maize which was infested by S.frugiperda larvae.The virgin M.separata females were repelled,while the mated females were attracted by the S.frugiperda-infested maize.To further understand the olfactory mechanism of this phenomenon,seven volatiles induced by S.frugiperda in maize were characterized by gas chromatography and mass spectrometry(GC-MS),including trans-2-hexenal,linalool,trans-β-farnesene,cis-3-hexenyl acetate,β-caryophyllene,trans-α-bergamotene,and isopentyl acetate.Additionally,electrophysiological and behavioral assays of the seven compounds were performed using both virgin and mated females of M.separata.We determined that virgin and mated females displayed different responses to the herbivore-induced plant volatile(HIPV).Trans-β-farnesene was the core compound for repelling virgin females,and trans-2-hexenal was the key attractant for oviposition in mated female M.separata individuals.These findings help our comprehension of the relationships between maize pests and offer new possibilities for controlling them by olfactory-based strategies.展开更多
Elaeagnaceae Juss. belongs to the family Elaeagnus L. and Shepherdia Nutt. This study aims at the significance and vegetative reproduction of species of the family (Elaeagnus macrophylla Thunb. and Shepherdia canadens...Elaeagnaceae Juss. belongs to the family Elaeagnus L. and Shepherdia Nutt. This study aims at the significance and vegetative reproduction of species of the family (Elaeagnus macrophylla Thunb. and Shepherdia canadensis (L.) Nutt.) in the national economy. The trials were carried out in the experimental site of SamSU’s Botanic Garden, which is named after Sharof Rashidov. The study’s findings are based on the results obtained by planting cuttings of S. canadensis and E. macrophylla species of varying sizes and durations, as well as the cuttings’ roots and the impacts of growth chemicals.展开更多
The Spring Festival,China’s most significant holiday,is also a vital driver of the country’s economy.This year,it shone even brighter,as the festival followed its inclusion on the UNESCO Representative List of the I...The Spring Festival,China’s most significant holiday,is also a vital driver of the country’s economy.This year,it shone even brighter,as the festival followed its inclusion on the UNESCO Representative List of the Intangible Cultural Heritage of Humanity,sparking renewed enthusiasm domestically and attracting heightened interest from abroad.展开更多
Advances in Atmospheric Sciences has long been a natural home for atmospheric scientists,but as the scope of the atmospheric sciences rapidly expands,it is logical and attractive to also broaden the scope of the journ...Advances in Atmospheric Sciences has long been a natural home for atmospheric scientists,but as the scope of the atmospheric sciences rapidly expands,it is logical and attractive to also broaden the scope of the journal.On this point,we are pleased to present this special topic on solar energy meteorology,a collection of five invited articles,addressing several important aspects including satellite remote sensing,solar system modeling,photovoltaic power forecasting,thermal balance of solar panels,and decarbonization strategy.All articles are contributed by established scientists,and readers can expect to enjoy the content of this special topic.展开更多
As China's first wholly foreign-owned Grade III general hospital opens,it means more medical options–and a new attractive field for foreign investors.ON October 3,1990,the People’s Republic of China and Singapor...As China's first wholly foreign-owned Grade III general hospital opens,it means more medical options–and a new attractive field for foreign investors.ON October 3,1990,the People’s Republic of China and Singapore established their diplomatic relations,and 2025 marks the 35th anniversary of the event.This makes it especially fitting that China’s first wholly foreign-owned grade III general hospital.展开更多
At its second edition,the Vietnam International Trade Fair for Apparel,Textiles,and Textile Technologies(VIATT)has once again proven a vital trade platform for the global textile value chain.Taking place from 26-28 Fe...At its second edition,the Vietnam International Trade Fair for Apparel,Textiles,and Textile Technologies(VIATT)has once again proven a vital trade platform for the global textile value chain.Taking place from 26-28 February 2025,the show concluded with resounding SucCess,after attracting over 19,000 visits from over 70 countries and regions.The fair also welcomed 463 exhibitors from 24 countries and regions.展开更多
For nano-collision, regulating the interaction between nanoparticles(NPs) and electrode interfaces is crucial for the precise analysis of individual NPs. However, existing ultramicroelectrodes(UMEs) suffer from narrow...For nano-collision, regulating the interaction between nanoparticles(NPs) and electrode interfaces is crucial for the precise analysis of individual NPs. However, existing ultramicroelectrodes(UMEs) suffer from narrow electrochemical window and poor electrode interface adhesion, severely hindering the application of precise single NP analysis. Here, we propose a simple and effective interface modification strategy. By electrochemically self-assembling poly(diallyldimethylammonium chloride)(PC) on the surface of carbon nanocone electrodes(CNCEs), we successfully prepared PC-modified CNCEs(PC–CNCEs). These electrodes not only possess sufficiently wide electrochemical window but also exhibit strong adhesion to negatively charged Ag NPs on their surfaces. Surface physical analysis and electrochemical molecule detection validated the high-density loading of PC on the modified electrodes. Furthermore, the working principle of PC–CNCEs for single Ag NP collision detection was further verified through the techniques of nanocollision and double-potential steps. Leveraging these significant advantages, PC–CNCEs not only achieved precise measurements of single or mixed-sized Ag NPs but also detected Ag NP solutions at concentrations as low as fmol/L levels. This advancement offers a new strategy for the rapid and precise analysis of NP colloids.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
Every year,during the rainy season,a scenic road winding through China's Poyang Lake like a mythical(虚构的)dragon becomes flooded,offering a unique driving and visual experience.Yongwu Road is the only stretch of...Every year,during the rainy season,a scenic road winding through China's Poyang Lake like a mythical(虚构的)dragon becomes flooded,offering a unique driving and visual experience.Yongwu Road is the only stretch of road connecting Wucheng,one of the oldest townships in China,to neighboring townships and counties.Part of the X219 county road,this 5.05 km piece of infrastructure was built straight through Poyang Lake,China's largest freshwater lake,making it one of the most famous tourist attractions of Jiangxi Province.But Yongwu Road is most popular with tourists at the onset of the rainy season,during spring when the water level starts rising.When the level of the surrounding lake reaches about 18.6 meters,water submerges(淹没)part of the road,turning Yongwu Road into“China's most beautiful road under the water”展开更多
Dear Editor,This letter presents a class of saturated sliding mode control (SMC)strategy for linear systems subject to impulsive disturbance and input saturation. To ensure the feasibility of proposed SMC under satura...Dear Editor,This letter presents a class of saturated sliding mode control (SMC)strategy for linear systems subject to impulsive disturbance and input saturation. To ensure the feasibility of proposed SMC under saturation, a relationship is established among attraction domain, saturation structure and control gain.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
Among the rolling hills and vineyards of the Tuscan countryside lies one of the most impressive tourist attractions not only in Italy,but in the entire world-a cascade(小瀑布)of white limestone pools overflowing with ...Among the rolling hills and vineyards of the Tuscan countryside lies one of the most impressive tourist attractions not only in Italy,but in the entire world-a cascade(小瀑布)of white limestone pools overflowing with warm turquoise(绿松石色)water known as Cascate del Mulino.展开更多
By encapsulating nanoscale particles of goethite(α-FeO(OH)),hydrous ceric oxide(CeO_(2)·H_(2)O,HCO)and silver nanoparticles(AgNPs)in the pores of polystyrene anion exchanger D201,a novel nanocomposite FeO(OH)-HC...By encapsulating nanoscale particles of goethite(α-FeO(OH)),hydrous ceric oxide(CeO_(2)·H_(2)O,HCO)and silver nanoparticles(AgNPs)in the pores of polystyrene anion exchanger D201,a novel nanocomposite FeO(OH)-HCO-Ag-D201 was prepared for the effective removal of arsenic from water.The isotherm study shows that FeO(OH)-HCO-Ag-D201 has excellent adsorption performance for As(III)and As(V),with an increased adsorption capacity of As(III)to 40.12 mg/g compared to that of 22.03 mg/g by the composite adsorbent without AgNPs(FeO(OH)-HCO-D201).The adsorption kinetics data showed that the sorption rate of FeO(OH)-HCO-Ag-D201 for As(III)is less than that for As(V),and the adsorption of As(III)and As(V)were consistent with the pseudo-second-order model and the pseudofirst-order model,respectively.Neutral or basic conditions are favored for the adsorption of As(III/V)by FeO(OH)-HCO-Ag-D201.Compared with nitrate/chloride/bicarbonate,sulfate/silicate/phosphate showed more remarkable inhibition of arsenic removal by FeO(OH)-HCO-Ag-D201,whereas natural organic matter showed no interference to the arsenic removal.The As(V)adsorption involved different interactions such as electrostatic attraction and surface complexation,while the adsorption of As(III)involved the part oxidization of As(III)to As(V)and the simultaneous adsorption of As(III)and As(V).In addition to the Ce(IV)in CeO_(2)·H_(2)O acted as an oxidant,the synergistic effect ofα-FeO(OH)and AgNPs also contributed to the oxidization of As(III)to As(V).Moreover,the reusable property suggested that this FeO(OH)-HCO-Ag-D201 nanocomposite has great potential for arsenic-contaminated water purification.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
This paper provides a robust test of predictability under the predictive regression model with possible heavy-tailed innovations assumption,in which the predictive variable is persistent and its innovations are highly...This paper provides a robust test of predictability under the predictive regression model with possible heavy-tailed innovations assumption,in which the predictive variable is persistent and its innovations are highly correlated with returns.To this end,we propose a robust test which can capture empirical phenomena such as heavy tails,stationary,and local to unity.Moreover,we develop related asymptotic results without the second-moment assumption between the predictive variable and returns.To make the proposed test reasonable,we propose a generalized correlation and provide theoretical support.To illustrate the applicability of the test,we perform a simulation study for the impact of heavy-tailed innovations on predictability,as well as direct and/or indirect implementation of heavy-tailed innovations to predictability via the unit root phenomenon.Finally,we provide an empirical study for further illustration,to which the proposed test is applied to a U.S.equity data set.展开更多
The 36th China International Automotive Service&Parts Exhibition(CIAACE),one of the most significant events in the automotive industry,is currently in full swing,attracting global attention and fostering internati...The 36th China International Automotive Service&Parts Exhibition(CIAACE),one of the most significant events in the automotive industry,is currently in full swing,attracting global attention and fostering international collaboration.With the theme“Global Resources,Chinese Market”,the exhibition spans an impressive 250,000 square meters and features nearly 6,000 domestic and international exhibitors showcasing over 80,000 products,including more than 5,000 new product launches.This year’s event is not only a comprehensive showcase of automotive innovation but also a strategic platform for Chinese enterprises to expand their global footprint,with a particular focus on the rapidly growing new energy vehicle(NEV)sector.展开更多
基金the Major State Basic Research of China(Grant No.G1999012011)the State Agriculture Program(Grant No.K2002-16) the Initializing Fund for Teachers of Ocean University of China.
文摘Attractabilities of different diets and dietary selectivity of Chinese shrimp, Fenneropenaeus chinensis were studied through behavior observation and feeding experiment, respectively. The five diets used in the experiment are: Fish Flesh (FF), Shrimp Flesh (SF), Clam Foot (CF), Polychaete Worm (PW), and Formulated Diet (FD). No significant differ- ences of attractability exist between any two different diets when every two natural diets or all five diets are provided simul- taneously. On the other hand, significant differences of attractability exist between FD and every single natural diet when they are provided simultaneously. Results of behavioral observation indicate that natural diets are more attractive than FD. In feeding experiment, Chinese shrimp has distinct selectivity on different diets. It positively selects CF and PW, negatively selects FF and SF, and excludes FD absolutely. The results of the present studies indicate that the dietary selectivity of shrimp was based not only on the attractabilities of the diets, but also on the responses such as growth and food conversion.
基金supported by the National Natural Science Foundation of China(Grant Nos.52372150,12088101,and 11991060)the National Key R&D Program of China(Grant No.2022YFB4200305)。
文摘Wide-bandgap two-dimensional (2D) β-TeO_(2) has been reported as a high-mobility p-type transparent semiconductor [Nat. Electron. 4 277 (2021)], attracting significant attention. This "breakthrough" not only challenges the conventional characterization of TeO_(2) as an insulator but also conflicts with the anticipated difficulty in hole doping of TeO_(2) by established chemical trends. Notably, the reported Fermi level of 0.9 eV above the valence band maximum actually suggests that the material is an insulator, contradicting the high hole density obtained by Hall effect measurement. Furthermore, the detected residual Se and the possible reduced elemental Te in the 2D β-TeO_(2) samples introduces complexity, considering that elemental Se, Te, and Te_(1−x)Se_(x) themselves are high-mobility p-type semiconductors. Therefore, doubts regarding the true cause of the p-type conductivity observed in the 2D β-TeO_(2) samples arise. In this Letter, we employ density functional theory calculations to illustrate that TeO_(2), whether in its bulk forms of α-, β-, or γ-TeO_(2), or in the 2D β-TeO_(2) nanosheets, inherently exhibits insulating properties and poses challenges in carrier doping due to its shallow conduction band minimum and deep valence band maximum. Our findings shed light on the insulating properties and doping difficulty of TeO_(2), contrasting with the claimed p-type conductivity in the 2D β-TeO_(2) samples, prompting inquiries into the true origin of the p-type conductivity.
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.
文摘It is one of the must-visit history museums,known for its vast collection of historical artifacts,attracting around three million domestic and international visitors each year.THE Shaanxi History Museum(SHM),in the renowned historic city of Xi’an in Shaanxi Province,is often regarded as one of the museums most difficult to get a ticket to in China.Each day,approximately 12,000 free online tickets are made available and are fully booked within just a couple of minutes.Its vast collection of treasured relics and numerous national treasures leave visitors in awe.
基金supported by the National Key Research and Development Program of China(2021YFD1400700)the Natural Science Foundation of Anhui Province,China(2308085MC89)the Agricultural Science and Technology Innovation Program of Chinese Academy of Agricultural Sciences(ASTIP)。
文摘The fall armyworm(Spodoptera frugiperda)is an invasive species and a destructive pest of maize,which significantly impacts native species and communities via complex mechanisms like competition for resources.However,the interaction between S.frugiperda and local pests remains unclear.In this study,we determined that Oriental armyworm(Mythimna separata)females with different mating status displayed different approach-avoidance behaviors towards maize which was infested by S.frugiperda larvae.The virgin M.separata females were repelled,while the mated females were attracted by the S.frugiperda-infested maize.To further understand the olfactory mechanism of this phenomenon,seven volatiles induced by S.frugiperda in maize were characterized by gas chromatography and mass spectrometry(GC-MS),including trans-2-hexenal,linalool,trans-β-farnesene,cis-3-hexenyl acetate,β-caryophyllene,trans-α-bergamotene,and isopentyl acetate.Additionally,electrophysiological and behavioral assays of the seven compounds were performed using both virgin and mated females of M.separata.We determined that virgin and mated females displayed different responses to the herbivore-induced plant volatile(HIPV).Trans-β-farnesene was the core compound for repelling virgin females,and trans-2-hexenal was the key attractant for oviposition in mated female M.separata individuals.These findings help our comprehension of the relationships between maize pests and offer new possibilities for controlling them by olfactory-based strategies.
文摘Elaeagnaceae Juss. belongs to the family Elaeagnus L. and Shepherdia Nutt. This study aims at the significance and vegetative reproduction of species of the family (Elaeagnus macrophylla Thunb. and Shepherdia canadensis (L.) Nutt.) in the national economy. The trials were carried out in the experimental site of SamSU’s Botanic Garden, which is named after Sharof Rashidov. The study’s findings are based on the results obtained by planting cuttings of S. canadensis and E. macrophylla species of varying sizes and durations, as well as the cuttings’ roots and the impacts of growth chemicals.
文摘The Spring Festival,China’s most significant holiday,is also a vital driver of the country’s economy.This year,it shone even brighter,as the festival followed its inclusion on the UNESCO Representative List of the Intangible Cultural Heritage of Humanity,sparking renewed enthusiasm domestically and attracting heightened interest from abroad.
文摘Advances in Atmospheric Sciences has long been a natural home for atmospheric scientists,but as the scope of the atmospheric sciences rapidly expands,it is logical and attractive to also broaden the scope of the journal.On this point,we are pleased to present this special topic on solar energy meteorology,a collection of five invited articles,addressing several important aspects including satellite remote sensing,solar system modeling,photovoltaic power forecasting,thermal balance of solar panels,and decarbonization strategy.All articles are contributed by established scientists,and readers can expect to enjoy the content of this special topic.
文摘As China's first wholly foreign-owned Grade III general hospital opens,it means more medical options–and a new attractive field for foreign investors.ON October 3,1990,the People’s Republic of China and Singapore established their diplomatic relations,and 2025 marks the 35th anniversary of the event.This makes it especially fitting that China’s first wholly foreign-owned grade III general hospital.
文摘At its second edition,the Vietnam International Trade Fair for Apparel,Textiles,and Textile Technologies(VIATT)has once again proven a vital trade platform for the global textile value chain.Taking place from 26-28 February 2025,the show concluded with resounding SucCess,after attracting over 19,000 visits from over 70 countries and regions.The fair also welcomed 463 exhibitors from 24 countries and regions.
基金support from the Instrument Developing Project of the Chinese Academy of Sciences (No.YJKYYQ20210003)Natural Science Foundation of Jilin Province (No. 20210101402JC)support from the National Natural Science Foundation of China (No. 22204159)。
文摘For nano-collision, regulating the interaction between nanoparticles(NPs) and electrode interfaces is crucial for the precise analysis of individual NPs. However, existing ultramicroelectrodes(UMEs) suffer from narrow electrochemical window and poor electrode interface adhesion, severely hindering the application of precise single NP analysis. Here, we propose a simple and effective interface modification strategy. By electrochemically self-assembling poly(diallyldimethylammonium chloride)(PC) on the surface of carbon nanocone electrodes(CNCEs), we successfully prepared PC-modified CNCEs(PC–CNCEs). These electrodes not only possess sufficiently wide electrochemical window but also exhibit strong adhesion to negatively charged Ag NPs on their surfaces. Surface physical analysis and electrochemical molecule detection validated the high-density loading of PC on the modified electrodes. Furthermore, the working principle of PC–CNCEs for single Ag NP collision detection was further verified through the techniques of nanocollision and double-potential steps. Leveraging these significant advantages, PC–CNCEs not only achieved precise measurements of single or mixed-sized Ag NPs but also detected Ag NP solutions at concentrations as low as fmol/L levels. This advancement offers a new strategy for the rapid and precise analysis of NP colloids.
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Every year,during the rainy season,a scenic road winding through China's Poyang Lake like a mythical(虚构的)dragon becomes flooded,offering a unique driving and visual experience.Yongwu Road is the only stretch of road connecting Wucheng,one of the oldest townships in China,to neighboring townships and counties.Part of the X219 county road,this 5.05 km piece of infrastructure was built straight through Poyang Lake,China's largest freshwater lake,making it one of the most famous tourist attractions of Jiangxi Province.But Yongwu Road is most popular with tourists at the onset of the rainy season,during spring when the water level starts rising.When the level of the surrounding lake reaches about 18.6 meters,water submerges(淹没)part of the road,turning Yongwu Road into“China's most beautiful road under the water”
基金supported by the National Natural Science Foundation of China(62173215)the Major Basic Research Program of the Natural Science Foundation of Shandong Province in China(ZR2021ZD04,ZR2020ZD24)
文摘Dear Editor,This letter presents a class of saturated sliding mode control (SMC)strategy for linear systems subject to impulsive disturbance and input saturation. To ensure the feasibility of proposed SMC under saturation, a relationship is established among attraction domain, saturation structure and control gain.
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.
文摘Among the rolling hills and vineyards of the Tuscan countryside lies one of the most impressive tourist attractions not only in Italy,but in the entire world-a cascade(小瀑布)of white limestone pools overflowing with warm turquoise(绿松石色)water known as Cascate del Mulino.
基金supported by the National Key Research and Development Program of China(No.2022YFA1205601).
文摘By encapsulating nanoscale particles of goethite(α-FeO(OH)),hydrous ceric oxide(CeO_(2)·H_(2)O,HCO)and silver nanoparticles(AgNPs)in the pores of polystyrene anion exchanger D201,a novel nanocomposite FeO(OH)-HCO-Ag-D201 was prepared for the effective removal of arsenic from water.The isotherm study shows that FeO(OH)-HCO-Ag-D201 has excellent adsorption performance for As(III)and As(V),with an increased adsorption capacity of As(III)to 40.12 mg/g compared to that of 22.03 mg/g by the composite adsorbent without AgNPs(FeO(OH)-HCO-D201).The adsorption kinetics data showed that the sorption rate of FeO(OH)-HCO-Ag-D201 for As(III)is less than that for As(V),and the adsorption of As(III)and As(V)were consistent with the pseudo-second-order model and the pseudofirst-order model,respectively.Neutral or basic conditions are favored for the adsorption of As(III/V)by FeO(OH)-HCO-Ag-D201.Compared with nitrate/chloride/bicarbonate,sulfate/silicate/phosphate showed more remarkable inhibition of arsenic removal by FeO(OH)-HCO-Ag-D201,whereas natural organic matter showed no interference to the arsenic removal.The As(V)adsorption involved different interactions such as electrostatic attraction and surface complexation,while the adsorption of As(III)involved the part oxidization of As(III)to As(V)and the simultaneous adsorption of As(III)and As(V).In addition to the Ce(IV)in CeO_(2)·H_(2)O acted as an oxidant,the synergistic effect ofα-FeO(OH)and AgNPs also contributed to the oxidization of As(III)to As(V).Moreover,the reusable property suggested that this FeO(OH)-HCO-Ag-D201 nanocomposite has great potential for arsenic-contaminated water purification.
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The research of WONG Hsin-Chieh is partially supported by the NSTC(111-2118-M-305-004-MY2)the research of PANG Tian-xiao is partially supported by the National Social Science Foundation of China(21BTJ067)。
文摘This paper provides a robust test of predictability under the predictive regression model with possible heavy-tailed innovations assumption,in which the predictive variable is persistent and its innovations are highly correlated with returns.To this end,we propose a robust test which can capture empirical phenomena such as heavy tails,stationary,and local to unity.Moreover,we develop related asymptotic results without the second-moment assumption between the predictive variable and returns.To make the proposed test reasonable,we propose a generalized correlation and provide theoretical support.To illustrate the applicability of the test,we perform a simulation study for the impact of heavy-tailed innovations on predictability,as well as direct and/or indirect implementation of heavy-tailed innovations to predictability via the unit root phenomenon.Finally,we provide an empirical study for further illustration,to which the proposed test is applied to a U.S.equity data set.
文摘The 36th China International Automotive Service&Parts Exhibition(CIAACE),one of the most significant events in the automotive industry,is currently in full swing,attracting global attention and fostering international collaboration.With the theme“Global Resources,Chinese Market”,the exhibition spans an impressive 250,000 square meters and features nearly 6,000 domestic and international exhibitors showcasing over 80,000 products,including more than 5,000 new product launches.This year’s event is not only a comprehensive showcase of automotive innovation but also a strategic platform for Chinese enterprises to expand their global footprint,with a particular focus on the rapidly growing new energy vehicle(NEV)sector.
