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Multiscale Characteristics and Connection Mechanisms of Attraction Networks:A Trajectory Data Mining Approach Leveraging Geotagged Data
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作者 JIANG Hongqiang WEI Ye +1 位作者 MEI Lin WANG Zhaobo 《Chinese Geographical Science》 SCIE CSCD 2024年第3期533-547,共15页
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
关键词 attraction network travel mobility polycentric structure network motif connectivity mechanism destination management organization(DMO) destination planning Beijing China
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Electrostatic Attraction and Repulsion Explained and Modelled Mathematically Using Classical Physics—A Detailed Mechanism Based on Particle Wave Functions
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作者 Declan Traill 《Journal of Applied Mathematics and Physics》 2024年第4期1050-1062,共13页
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
关键词 ELECTROSTATIC Electron POSITRON COULOMB Force attractION REPULSION Wave Function Electric Magnetic Radiation Pressure Shell THEOREM 3D Computer Model Quantum
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Augmented Appeal China is doubling down on attracting foreign investors through broader market access and improved business environment
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作者 WANG XIAOHONG ZHANG JIANPING TANG YIHONG 《ChinAfrica》 2024年第8期28-30,共3页
Attracting foreign capital is a key pillar of China’s reform and opening up policy,and foreign-funded enterprises are an important component of China’s economy.Currently,China is taking steps to further boost its at... Attracting foreign capital is a key pillar of China’s reform and opening up policy,and foreign-funded enterprises are an important component of China’s economy.Currently,China is taking steps to further boost its attractiveness as a foreign direct investment(FDI)destination in order to seek more foreign capital. 展开更多
关键词 funded INVESTOR attracting
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Preliminary Study of 12 Chinese Herbs as Feed Attractants on Turbot Juvenile(Scophthalmus maximus)
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作者 朱国霞 白东清 +3 位作者 李玉华 马静 吴旋 宁博 《Agricultural Science & Technology》 CAS 2010年第6期115-116,120,共3页
[Objective] The paper aims to study the attractive effects of 12 Chinese medicinal herbs on Scophthalmus maximus juvenile.[Method] We took 200 Scophthalmus maximus with the average body length of 3 cm,average weight o... [Objective] The paper aims to study the attractive effects of 12 Chinese medicinal herbs on Scophthalmus maximus juvenile.[Method] We took 200 Scophthalmus maximus with the average body length of 3 cm,average weight of 1 g and 60 days of age as the research object,and 12 Chinese medicinal herbs as feed attractants were selected,including Cloves,Cinnamon,Star anise,Kaempferol,Mint,Coptis,Phellodendron,skullcap,Gardenia,Sophora flavescens,Mume,Myrobalan meat were selected.The amount added to the basic diet was 2‰..The times of turbot juveniles going into each inducing room and the times of turbot juveniles biting the feed ball were recorded by maze experiments.Inducing effects of the Chinese herbal medicines were analyzed.[Result] The results showed that the attractant effect of Mume,Gardenia,Scutellaria and kaempferol had the significantly inducing effect on Scophthalmus maximus juvenile.And 2‰ Gardenia,5‰ Matrine,5‰ Scutellaria and 2‰ Kaempferol have the best attractant effects.In compound experients,the attractive effect of mixture of 2‰ matrine and gardenia on Scophthalmus maximus was the best.[Conclusion] The attractive effect on Scophthalmus maximus has something to do with the kind and concentration of Chinese medicinal herbs. 展开更多
关键词 Chinese medicinal herbs Scophthalmus maximus juvenile attractant
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Development of synthetic volatile attractant for male Ectropis obliqua moths 被引量:10
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作者 SUN Xiao-ling LI Xi-wang +3 位作者 XIN Zhao-jun HAN Juan-juan RAN Wei LEI Shu 《Journal of Integrative Agriculture》 SCIE CAS CSCD 2016年第7期1532-1539,共8页
The tea geometridEctropis obliquais one of the most serious leaf-feeding insect pests in tea (Camelia sinensis) in East Asia. Although several volatile chemicals emitted from tea plants have been reported to be attr... The tea geometridEctropis obliquais one of the most serious leaf-feeding insect pests in tea (Camelia sinensis) in East Asia. Although several volatile chemicals emitted from tea plants have been reported to be attractive toE. obliqua moths, no synthetic attractants for E. obliqua moths have been developed. By measuring the behavioral responses of the moth to a series of chemicals in the lab, we found that a blend containing a ternary mixture containing (Z)-3-hexenal, (Z)-3-hexenyl hexanoate and benzyl alcohol clearly attracted toE. obliqua moths of both sex and that (Z)-3-hexenyl acetate could enhance the attractiveness of the ternary blend. Moreover, we found that the volatiles emitted from the plant-E. obliqua larva com-plex have the same attractiveness as: 1) the blend of volatiles containing the ternary mixture and 2) the blend containing (Z)-3-hexenyl acetate plus the ternary mixture to both male and female moths. In a ifeld bioassay, more male moths were observed on traps that were baited with the blend containing (Z)-3-hexenyl acetate plus the ternary mixture than on control traps. Our study raises the tantalizing possibility that synthetic blends could be deployed as attractants for pests in the ifeld. 展开更多
关键词 attractant synthetic volatile blends Ectropis obliqua MOTH tea plantation
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Adverse effects of metal exposure on chemotaxis towards water-soluble attractants regulated mainly by ASE sensory neuron in nematode Caenorhabditis elegans 被引量:5
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作者 XING Xiaojuan, DU Min, ZHANG Yanfen, WANG Dayong Key Laboratory of Developmental Genes and Human Disease in Ministry of Education, Department of Genetics and Developmental Biology, Southeast University Medical School, Nanjing 210009, China. 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2009年第12期1684-1694,共11页
Chemotaxis to water-soluble attractants is mainly controlled by ASE sensory neuron whose specification is regulated by che-1 in Caenorhabditis elegans. Our data suggested that exposure to high concentrations of metals... Chemotaxis to water-soluble attractants is mainly controlled by ASE sensory neuron whose specification is regulated by che-1 in Caenorhabditis elegans. Our data suggested that exposure to high concentrations of metals, such as Pb, Cu, Ag, and Cr, would result in severe defects of chemotaxis to water-soluble attractants of NaCl, cAMP, and biotin. Moreover, the morphology of ASE neuron structures as observed by relative fluorescent intensities and relative size of fluorescent puncta of cell bodies, relative lengths of sensory endings in ASE neurons, and the expression patterns of che-1 were obviously altered in metal exposed animals when they meanwhile exhibited obvious chemotaxis defects to water-soluble attractants. In addition, the dendrite morphology could be noticeably changed in animals exposed to 150 μmol/L of Pb, Cu, and Ag. Furthermore, we observed significant decreases of chemotaxis to water-soluble attractants in Pb exposed che-1 mutant at concentrations more than 2.5 μmol/L, and in Cu, Ag, and Cr exposed che-1 mutant at concentrations more than 50 μmol/L. Therefore, impairment of the ASE neuron structures and functions may largely contribute to the appearance of chemotaxis defects to water-soluble attractants in metal exposed nematodes. 展开更多
关键词 CHEMOTAXIS water-soluble attractant ASE neuron che-1 Caenorhabditis elegans
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Effects of Feeding Attractants on the Growth and Body Composition,Digestive Enzyme and Serum Indices of Hucho taimen 被引量:1
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作者 WANG Chang-an XU Qi-you +2 位作者 CHANG Ya-ping XU Hong YIN Jia-sheng 《Animal Husbandry and Feed Science》 CAS 2012年第5期236-240,共5页
[ Objective] The aim was to study the effects of four feeding attractants(dimethyl-15-propiothetin, trimethylamine oxide, betaine, sodium- 5'-inosinate) on feed intake, growth performance, body composition, digesti... [ Objective] The aim was to study the effects of four feeding attractants(dimethyl-15-propiothetin, trimethylamine oxide, betaine, sodium- 5'-inosinate) on feed intake, growth performance, body composition, digestive enzyme activities and serum indices of Hucho taimen with initial body weight 9.39 ±0.26 g. [ Method] The Hucho taimen was raised in water flow system. There was one control group and four process group. Each diet was randomly assigned to triplicates of 50 fish for 56 days. During the experiment, the water temperature fluctuated from 9.3℃ to 14.2℃ and the dissolved oxygen was above 8.0 mg/L. [ Result ] The weight gain rate and specific growth rate increased significantly by adding 0.2% dimethyl- 13-propiothetin, 0.2% trimethylamine oxide, 0.2% betaine, but there were no changes with 0.05% sodium-5'-inosinate supplementation ( P 〉 0.05). The body crude protein increased significantly by supplementing 0.2% dimethyl-15-propiothetin( P 〈0.05), and body crude lipid decreased signifi- cantly by adding 0.2% trimethylamine oxide and 0.2% betaine( P 〈0.05), but body composition had no changes by supplementing 0.05% sodium- 5'-inosinate( P 〉0.05). The digestive enzyme activities increased significantly by adding 0.2% dimethyl-13-propiothetin and 0.2% trimethylamine oxide( P 〈0.05), and the lipase increased significantly by supplementing 0.2% betaine( P 〈 0.05), but digestive enzyme activities had no changes supplemented 0.05% sodium-5'-inosinate( P 〉 0.05). The serum total protein, albumin and globulin increased significantly added 0.2% dimethyl-15- propiothetin( P 〈0.05), and the high density lipoprotein content increased while cholesterol, triglycedde and low density lipoprotein decreased sig- nificantly added 0.2% trimethylamine oxide and 0.2% betaine( P 〈 0.05), and serum complement 3 and complement 4 increased significantly sup- plemented 0.05% sodium-5'-inosinate ( P 〈 0.05). [ Conclusion] The food intake, growth performance, body composition and digestive ability of taimen were improved supplemented with 0.2% dimethyl-15-propiothetin, 0.2% trimethylamine oxide and 0.2% betaine, respectively( P 〈 0.05), but not 0.05% sodium-5'-inosinate. The immunity of body was improved by adding 0.05% sodium-5'-inosinate. 展开更多
关键词 Hucho taimen Feeding attractant GROWTH PHYSIOLOGY China
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Isolation of Enterococcus faecium with Feeding Attractant Function from Pacific White Shrimp (Litopenaeus vannamei) Intestine
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作者 LI Yan LU Chunyu +1 位作者 YU Zhanqiao MA Qingshan 《Journal of Ocean University of China》 SCIE CAS CSCD 2020年第4期931-940,共10页
In the present study,we isolated the lactic acid bacterium strain SC-01 from Pacific white shrimp(Litopenaeus vannamei)intestine.Using conventional and molecular methods,we identified the bacterium as Enterococcus fae... In the present study,we isolated the lactic acid bacterium strain SC-01 from Pacific white shrimp(Litopenaeus vannamei)intestine.Using conventional and molecular methods,we identified the bacterium as Enterococcus faecium,and found it had the function of feeding attractant and could inhibit the development of Vibrio parahaemolyticus(zone of inhibition:14 mm).The attractant effect of its fermentation broth is significantly better than that of the chemical attractant trimethylamine oxide(TMAO)(P<0.05),and is equivalent to that of dimethyl-beta-propiothetin(DMPT)based on the feeding behavior of shrimp.High performance liquid chromatography(HPLC)analysis suggested that inosine-5’-monophosphate(IMP)may be a component of the attractant.A biosecurity evaluation revealed a negative result in hemolytic assays,and no shrimp mortality was resulted from SC-01 fermentation broth challenge.Feeding trials(60 days)indicated that the SC-01 fermentation broth(viable counts:5.7×109 cfu mL−1)could improve feed intake,weight gain rate(WGR)and specific growth rate(SGR),and decrease the count of Vibrio sp.in the intestine of shrimp. 展开更多
关键词 lactic acid bacterium Enterococcus faecium PROBIOTICS attractant Litopenaeus vannamei
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Highly-Effective Nitrogen-phosphate Compound Fertilizer.
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《China's Foreign Trade》 1995年第2期21-21,共1页
The Tianji brand highly effective nitrogen-phosphate compound fertilizer is produced by the Shanxi Cheyenne Fertilizer Plant, one of the main compound fertilizer producers in the country. The fertilizer is made throug... The Tianji brand highly effective nitrogen-phosphate compound fertilizer is produced by the Shanxi Cheyenne Fertilizer Plant, one of the main compound fertilizer producers in the country. The fertilizer is made through the chemical reaction between the nitric acid and the fine phosphate ore and a series of purifying and condensing processes. It contains nitrogen, phosphate, calcium, magnesium, zinc, copper and iron. It has high and lasting fertility 展开更多
关键词 HIGH highly-effective Nitrogen-phosphate Compound Fertilizer
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Field Trapping Technology of Sex Attractants against Major Pests of Broccoli
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作者 Liu Weiming Wang Enguo +1 位作者 Liu Yenan He Xianbiao 《Plant Diseases and Pests》 CAS 2020年第1期22-29,共8页
[Objective]The paper was to explore the comprehensive sexual attraction control technology of main pests in broccoli,and to improve the green control technology of main pests in broccoli.[Method]The comprehensive cont... [Objective]The paper was to explore the comprehensive sexual attraction control technology of main pests in broccoli,and to improve the green control technology of main pests in broccoli.[Method]The comprehensive control technology of sex attractants against major pests in broccoli was studied by using special sex attractants,lures and traps.[Result]The mixed quantities of Spodoptera litura,Spodoptera exigua and Plutella xylostella were fluctuated in a"W"shape in broccoli growing season in coastal area of Taizhou,central Zhejiang province,including seedling growth period(July to August),rosette and bud growth period(late September to early November),late harvest period of late-ripening broccoli(after early march).S.exigua and S.litura occurred severely at seedling stage;S.litura,S.exigua and P.xylostella occurred simultaneously at rosette and bud growth period;P.xylostella damaged florets of lateral branches in late harvest period.The trapping effects of combination A and E against S.litura,S.exigua and P.xylostella were the best;more than 1260 individuals of S.litura,S.exigua and P.xylostella were daily trapped per hectare,and the occurrence and damage of the three insect pests could be basically controlled.With the sex attract produced in Ningbo as an example,the combination of S.litura S type∶S.exigua S type∶P.xylostella blue type=1∶1∶4 distributed in five stars of clubs(space 10-20 cm)showed good comprehensive trapping effect in large area demonstration;traps were hung at the height of 0.5 m(0.2 m for P.xylostella),and lures were replaced once every 30-40 d.[Conclusion]Using special sex attractants,the comprehensive effects on S.litura,S.exigua and P.xylostella were determined at rosette and bud growth period of broccoli through combination modes,and supporting application technology were put forward,making great progress in exploring and improving sex attractant combination against insect pests. 展开更多
关键词 BROCCOLI Sex attractant SPODOPTERA litura SPODOPTERA EXIGUA PLUTELLA XYLOSTELLA
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What is attractive rural landscape?Differences in the social and expert assessment of the changes in the rural landscape of the Carpathian region in Poland with regard to the need of its protection
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作者 Agata GAJDEK Barbara KRUPA Anna NOWAK 《Journal of Mountain Science》 SCIE CSCD 2023年第2期501-515,共15页
Contemporary villages of the mountain region are subject to uncontrolled structural and spatial transformations,which cause deformation of centuries-old spatial systems of high cultural and natural value.The aim of th... Contemporary villages of the mountain region are subject to uncontrolled structural and spatial transformations,which cause deformation of centuries-old spatial systems of high cultural and natural value.The aim of the study is to confront the opinions of the inhabitants and experts regarding the condition of the cultural landscape of the villages in south-eastern Poland.This area belongs to the Carpathian region of Central Europe.The historical and economic conditions of the studied region,related to the functioning in the post-war period,and then its breakdown and the development of the free market economy,constitute an interesting background for the proposed research.Local communities still remembering the period of difficulties related to the period of systemic transformations,are currently experiencing a relative prosperity,many difficulties related to the period of systemic transformations,are currently experiencing a relative prosperity,which is also expressed in a completely new,previously unknown way of managing the landscape.Investments implemented in villages are associated by the inhabitants with the improvement of the standards and quality of life.They assess them rather positively.An expert assessment of these landscape transformations indicates their negative dimension and the risk of losing timeless values.The discrepancy in the assessment of experts and local residents creates difficulties in the protection of the rural landscape.Therefore,high-quality visual landscape features among rural residents is necessary from the point of view of its multi-faceted and effective protection.Local initiatives and actions in the field of industry policy should play a significant role in this respect by consolidating the images of a harmonious landscape in the public awareness. 展开更多
关键词 Polish village Landscape attractiveness Cultural landscape Spatial systems
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How can we increase attraction and retention of nurses? A research with young nurses
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作者 Diane-Gabrielle Tremblay Marie-Julie Lanoix 《Open Journal of Nursing》 2023年第11期763-785,共23页
The persistent challenges in attracting and retaining a diverse healthcare workforce, with a specific focus on nurses, have become increasingly pronounced in recent years. These hurdles have been exacerbated by a grow... The persistent challenges in attracting and retaining a diverse healthcare workforce, with a specific focus on nurses, have become increasingly pronounced in recent years. These hurdles have been exacerbated by a growing difficulty in retaining young nurses, thereby exacerbating labor shortages driven by demographic shifts and the retirement of experienced nursing professionals. While most research efforts have concentrated on the broader issue of nurse retention, our study is centered on a specific demographic—young nurses. Our research endeavors to shed light on the unique challenges faced by young nurses through a qualitative survey involving nursing students who are simultaneously employed. We seek to discern the multifaceted obstacles they encounter in both their academic environment and the healthcare organizations where they work. While certain challenges are linked to course organization, examinations, and the time required for studying, our respondents overwhelmingly emphasize the pivotal role of the work environment in facilitating the harmonization of work, family, and educational commitments. This reconciliation is achieved through measures such as flexible working arrangements and the efficient organization of nursing duties. The primary objective of our research is to provide insights into how these diverse challenges can be effectively addressed and how a range of measures can significantly contribute to the attraction and retention of nursing students, as well as the long-term retention of nurses within the healthcare system. Our recommendations are intended to be of practical use to a wide array of stakeholders, including academic institutions, particularly colleges and universities offering nursing programs, as well as hospitals, clinics, and other healthcare institutions that hire nurses. By collaboratively addressing these challenges and implementing the recommended measures, we aim to fortify the healthcare workforce and ensure the continued provision of quality care to patients. . 展开更多
关键词 attractION RETENTION Nurses NURSING Wok-Life Balance
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Interpersonal Perception in Virtual Groups: Examining Homophily, Identification and Individual Attraction Using Social Relations Model in Network
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作者 Zuoming Wang 《Social Networking》 2023年第2期45-56,共12页
With the penetration of the Internet, virtual groups have become more and more popular. The reliability and accuracy of interpersonal perception in the virtual environment is an intriguing issue. Using the Social rela... With the penetration of the Internet, virtual groups have become more and more popular. The reliability and accuracy of interpersonal perception in the virtual environment is an intriguing issue. Using the Social relations model (SRM) [1], this paper investigates interpersonal perception in virtual groups from a multilevel perspective. In particular, it examines the following three areas: homophily, identification, and individual attraction, and explores how much of these directional and dyadic relational evaluations can be attributed to the effect of the actor, the partner, and the relationship. 展开更多
关键词 Virtual Groups Interpersonal Perception Social Relations Model HOMOPHILY IDENTIFICATION Individual attraction
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Existence of hidden attractors in nonlinear hydro-turbine governing systems and its stability analysis
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作者 赵鹏翀 卫皓娟 +3 位作者 徐振坤 陈帝伊 许贝贝 王雨萌 《Chinese Physics B》 SCIE EI CAS CSCD 2023年第9期220-228,共9页
This work studies the stability and hidden dynamics of the nonlinear hydro-turbine governing system with an output limiting link,and propose a new six-dimensional system,which exhibits some hidden attractors.The param... This work studies the stability and hidden dynamics of the nonlinear hydro-turbine governing system with an output limiting link,and propose a new six-dimensional system,which exhibits some hidden attractors.The parameter switching algorithm is used to numerically study the dynamic behaviors of the system.Moreover,it is investigated that for some parameters the system with a stable equilibrium point can generate strange hidden attractors.A self-excited attractor with the change of its parameters is also recognized.In addition,numerical simulations are carried out to analyze the dynamic behaviors of the proposed system by using the Lyapunov exponent spectra,Lyapunov dimensions,bifurcation diagrams,phase space orbits,and basins of attraction.Consequently,the findings in this work show that the basins of hidden attractors are tiny for which the standard computational procedure for localization is unavailable.These simulation results are conducive to better understanding of hidden chaotic attractors in higher-dimensional dynamical systems,and are also of great significance in revealing chaotic oscillations such as uncontrolled speed adjustment in the operation of hydropower station due to small changes of initial values. 展开更多
关键词 nonlinear hydro-turbine governing systems hidden attractors basin of attraction Lyapunov exponent spectrum
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科教融汇何以成为职业教育发展的新方向 被引量:1
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作者 卢晓中 杜玉帆 《重庆高教研究》 北大核心 2024年第5期14-29,共16页
党的二十大报告强调构建高质量教育体系,提出“三融”策略与职业教育类型优化,其中科教融汇的提出标志着教育资源整合与协同发展策略从高等教育向职业教育延伸。作为一个全新的教育理念,科教融汇在职业教育发展的新方向中占据核心地位,... 党的二十大报告强调构建高质量教育体系,提出“三融”策略与职业教育类型优化,其中科教融汇的提出标志着教育资源整合与协同发展策略从高等教育向职业教育延伸。作为一个全新的教育理念,科教融汇在职业教育发展的新方向中占据核心地位,通过理念、体系、实践、应用、文化5个层面促进教育链、人才链、产业链、创新链的深度融合,实现从教育理念到实践的全方位变革。在理念层面,科教融汇驱动职普融通结构性变革与价值重塑,体现为教育理念跨界整合、认知模式多维度突破、知识观念革新跃升以及教育目标重构。在体系层面,构建“教学—科研—产业”三螺旋模型的产教融合生态系统,实现教学科研协同、科研产业互动、专业产业融合,促进三螺旋协同进化,形成自适应创新生态系统。在实践层面,科教融汇聚焦人才培养难题。作为人才培养的一种新模式,科教融汇的核心是能有效应对人才培养的复杂挑战,聚焦教育科研链式融合与优化、智能分类体系构建、全链条协同创新平台搭建以及终身学习体系的前瞻布局,构建一种集知识创新、人才培养、产业升级于一体的生态系统,为培养拔尖创新人才提供动态适应、个性化和前瞻性的解决方案。在应用层面,科教融汇引领科技创新及国际化应用。在文化层面,科教融汇重塑职业教育形象。作为动态实践哲学的典范,科教融汇引领教育与科技在操作层面紧密融合与互促发展,从5个方面系统推进职业教育发展新方向:促进“三融”融合,统筹“三教”协同创新;立足引擎驱动,推动职普融通;赋能“四链”衔接,深化产教融合;彰显时代特征,开辟发展新赛道;着力制度变革,形塑发展新格局。 展开更多
关键词 科教融汇 职业教育 类型优化 系统性变革 适应性 吸引力
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引诱剂与杀虫剂联合使用对茄子黄胸蓟马的防治效果
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作者 田厚军 赵建伟 +3 位作者 林硕 陈艺欣 余芸 陈勇 《中国生物防治学报》 CSCD 北大核心 2024年第2期266-273,共8页
由于化学杀虫剂的频繁和高剂量使用已渐渐失去对蓟马的防控效果,为进一步探究杀虫剂与引诱剂在控制蓟马方面的联合作用,本文通过设置不同剂量的杀虫剂与蓝板引诱剂进行复合诱杀蓟马,并与单独使用杀虫剂或蓝板对黄胸蓟马的防治效果进行... 由于化学杀虫剂的频繁和高剂量使用已渐渐失去对蓟马的防控效果,为进一步探究杀虫剂与引诱剂在控制蓟马方面的联合作用,本文通过设置不同剂量的杀虫剂与蓝板引诱剂进行复合诱杀蓟马,并与单独使用杀虫剂或蓝板对黄胸蓟马的防治效果进行了比较。结果表明,随着处理时间的增加,不同杀虫剂处理对黄胸蓟马的防治效果逐渐升高,总体上,复配药剂的防效要好于单剂药剂。且在药后3 d,30%虫螨腈·唑虫酰胺悬浮剂对黄胸蓟马的防效(84.36%)要显著高于240 g/L虫螨腈悬浮剂(74.32%)、15%唑虫酰胺悬浮剂(76.84%)、3%甲氨基阿维菌素苯甲酸盐微乳剂(71.85%)三个单剂的防效。药后10 d,30%虫螨腈·唑虫酰胺悬浮剂对黄胸蓟马的防效最高可达90.17%。杀虫剂与蓝板引诱剂联合使用对黄胸蓟马的田间防治效果要显著好于仅用杀虫剂的防效,而且在药后3 d、7 d和10 d,复合药剂或单剂对黄胸蓟马的防效均高于90%,最高可达98.54%,说明蓝板引诱剂对黄胸蓟马起到了很好的防治效果。在单独统计蓝板引诱剂的防治效果时发现,对黄胸蓟马防治效果高的药剂,与其联合作用中的蓝板诱集效果比较低;反之,对黄胸蓟马防治效果低的药剂,与其联合作用中的蓝板诱集效果比较高;这也说明蓝板诱集可作为低剂量杀虫剂用于防治蓟马类害虫的有效互补措施。本研究明确了杀虫剂与引诱剂的联合作用效果,以期在提高蓟马防治效果的同时降低杀虫剂浓度或减少其使用剂量,为害虫综合防控措施提供参考。 展开更多
关键词 黄胸蓟马 诱集剂 蓝板 杀虫剂 田间防效
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二战后美国联邦政府对科技创新生态系统的优化策略 被引量:1
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作者 刘国柱 《学术前沿》 北大核心 2024年第12期56-71,共16页
自19世纪80年代以来,美国在科技创新领域一直处在世界领先地位,良好的科技创新生态系统是缔造美国科技优势地位的最关键因素。无论是面对复杂的国内经济形势还是激烈的国际竞争,美国总是能通过联邦政府的政策调整、立法改革为本国科技... 自19世纪80年代以来,美国在科技创新领域一直处在世界领先地位,良好的科技创新生态系统是缔造美国科技优势地位的最关键因素。无论是面对复杂的国内经济形势还是激烈的国际竞争,美国总是能通过联邦政府的政策调整、立法改革为本国科技创新创造良好的政策环境和制度环境。不断优化的科技创新生态系统使得美国将危机变为转机,牢牢抓住科技革命的机遇,在二战后长期保持世界科技领域的领先地位。 展开更多
关键词 创新生态系统 创新政策与治理 技术转让法律体系 人才吸引战略
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四川省红色旅游景点空间格局及旅游路径优化 被引量:1
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作者 陈岚 赵洁雅 +1 位作者 谭林 詹昭 《国土与自然资源研究》 2024年第2期91-96,共6页
以四川省为例,利用核密度、空间自相关等方法分析其红色旅游景点空间分布格局,进一步探索旅游优化路径。结果表明,四川省红色旅游景点呈集聚分布态势,主要集中在成都-广元-宜宾-雅安等地,形成了“两带三团四心”的双“C”型空间格局。... 以四川省为例,利用核密度、空间自相关等方法分析其红色旅游景点空间分布格局,进一步探索旅游优化路径。结果表明,四川省红色旅游景点呈集聚分布态势,主要集中在成都-广元-宜宾-雅安等地,形成了“两带三团四心”的双“C”型空间格局。热点区和次热点区占据四川省红色旅游景点空间区域的主要部分,空间关联性差异明显,区域发展均衡程度不高。基于红色旅游景点的空间结构特征及各地资源属性,从顶层规划设计、旅游空间结构和红色产品策划三个维度提出了旅游开发的优化途径。 展开更多
关键词 红色旅游景点 空间格局特征 旅游开发路径 四川省
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许氏平鲉幼鱼对人工鱼礁模型不同阴影情况的行为响应
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作者 唐衍力 林嘉政 +2 位作者 王欣 于浩林 王欣欣 《中国海洋大学学报(自然科学版)》 CAS CSCD 北大核心 2024年第1期26-34,共9页
阴影效应是影响人工鱼礁诱集效果的主要因素之一,为研究许氏平鲉(Sebastes schlegelii)对人工鱼礁不同阴影情况的行为响应,采用室内模拟实验方法,在实验水槽顶部固定光源,共设计3组实验:A组实验探究不同阴影面积的鱼礁模型对实验鱼的诱... 阴影效应是影响人工鱼礁诱集效果的主要因素之一,为研究许氏平鲉(Sebastes schlegelii)对人工鱼礁不同阴影情况的行为响应,采用室内模拟实验方法,在实验水槽顶部固定光源,共设计3组实验:A组实验探究不同阴影面积的鱼礁模型对实验鱼的诱集效果;B组实验探究不放置鱼礁模型、悬挂不同开孔率顶板对实验鱼的诱集效果;C组实验探究阴影面积相同但开孔数量不同的鱼礁模型对实验鱼的诱集效果;对照组实验水槽中不放置鱼礁模型、不悬挂顶板。观察并记录许氏平鲉幼鱼(体长(5.06±0.09)cm,体质量(3.22±0.16)g)在水槽中的行为与分布特征。研究表明:3个实验组中许氏平鲉在鱼礁放置区域的出现率均显著高于对照组和其他区域;A组实验中,许氏平鲉在鱼礁放置区的平均出现率随着鱼礁阴影面积的增大而上升;B组实验中,许氏平鲉在顶板放置区的平均出现率显著高于对照组,但不同水平组之间差异不显著;C组实验中,开孔数为1时许氏平鲉在鱼礁放置区的平均出现率与开孔数为9时相近且高于开孔数为4和6时。研究结果表明,阴影面积越大的人工鱼礁对许氏平鲉的诱集效果越好,阴影面积相同时开孔数较多的人工鱼礁能够在提供良好庇护所的同时保证诱集效果。 展开更多
关键词 人工鱼礁 许氏平鲉 阴影效应 行为响应 诱集
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三种植物挥发性化合物对黄胸蓟马和南方小花蝽的吸引作用及诱集效率
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作者 林涛 郭雅清 +3 位作者 陈晓瑜 杨风花 杨广 魏辉 《昆虫学报》 CAS CSCD 北大核心 2024年第8期1096-1105,共10页
【目的】评估芳樟醇、茉莉酸甲酯和香叶醇3种植物挥发性化合物对黄胸蓟马Thrips hawaiiensis和南方小花蝽Orius strigicollis的吸引作用,为利用植物挥发性化合物田间诱集南方小花蝽防控黄胸蓟马提供依据。【方法】采用Y形嗅觉仪测定980,... 【目的】评估芳樟醇、茉莉酸甲酯和香叶醇3种植物挥发性化合物对黄胸蓟马Thrips hawaiiensis和南方小花蝽Orius strigicollis的吸引作用,为利用植物挥发性化合物田间诱集南方小花蝽防控黄胸蓟马提供依据。【方法】采用Y形嗅觉仪测定980, 10, 0.1和0.001 g/L芳樟醇、茉莉酸甲酯和香叶醇对黄胸蓟马成虫及南方小花蝽5龄若虫和成虫的吸引率,测定980, 10和0.1 g/L香叶醇对南方小花蝽和黄胸蓟马成虫吸引作用的时间效应以及吸引率;并进一步在田间大棚条件测定10 g/L香叶醇诱集的黄胸蓟马和南方小花蝽的成虫数量。【结果】与对照组(石蜡油)比,测试的各浓度茉莉酸甲酯对黄胸蓟马成虫和南方小花蝽5龄若虫的吸引率差异不显著,980 g/L芳樟醇对黄胸蓟马成虫吸引率显著提高,但测试的各浓度芳樟醇对南方小花蝽5龄若虫和成虫的吸引率无显著变化;香叶醇纯品(980 g/L)对黄胸蓟马成虫的吸引率显著提高,高浓度(10和0.1 g/L)香叶醇对南方小花蝽成虫的吸引率均显著提高,但对南方小花蝽若虫的吸引率变化不显著。不同浓度香叶醇诱集的黄胸蓟马和南方小花蝽成虫数量具有显著的时间效应,且980和10 g/L香叶醇在处理后2 h时诱集的南方小花蝽成虫数量显著高于其他浓度香叶醇诱集的,并且无论是否被黄胸蓟马成虫为害,980和10 g/L香叶醇处理的青椒苗对南方小花蝽成虫的吸引率显著高于清水对照。与对照组(喷洒清水)比,田间大棚喷洒10 g/L香叶醇的处理组在5 h内诱集的黄胸蓟马成虫数量差异不显著,但诱集的南方小花蝽成虫数量显著提高。【结论】芳樟醇、茉莉酸甲酯和香叶醇3种植物挥发性化合物对黄胸蓟马和南方小花蝽的吸引率存在差异,10 g/L香叶醇能够在5 h内有效诱集南方小花蝽成虫,但不显著吸引黄胸蓟马,这些结果为利用香叶醇诱集南方小花蝽防控黄胸蓟马提供了理论依据和技术支撑。 展开更多
关键词 黄胸蓟马 南方小花蝽 植物挥发物 吸引作用 诱集 香叶醇
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