期刊文献+
共找到2,495篇文章
< 1 2 125 >
每页显示 20 50 100
Exploration and Research on Textbook Quality Evaluation Index System Based on Engineering Major in Higher Education
1
作者 Xiaoyang Yue Yanqiong Wu 《Journal of Contemporary Educational Research》 2024年第3期1-6,共6页
The report of the Chinese 20th National Congress put forward“strengthening the construction and management of textbooks”for the first time,which indicates the importance of textbook construction and highlights the v... The report of the Chinese 20th National Congress put forward“strengthening the construction and management of textbooks”for the first time,which indicates the importance of textbook construction and highlights the vital position of textbooks in the overall development of the country.From the perspective of textbook quality,and based on the research and analysis of the policy requirements and current evaluation indicators of higher education textbooks,this paper establishes the textbook quality evaluation index system composed of basic indicators and evaluation indicators.This system is based on the principles of science,comprehensiveness,operability,and target-oriented approach.It provides a relatively scientific,objective,and fair reference system for the management and evaluation of textbooks. 展开更多
关键词 Textbooks Evaluation index system Higher education engineering major
下载PDF
Relationship between depression,smartphone addiction,and sleep among Chinese engineering students during the COVID-19 pandemic 被引量:1
2
作者 Wen-Juan Gao Yan Hu +1 位作者 Jun-Lin Ji Xin-Qiao Liu 《World Journal of Psychiatry》 SCIE 2023年第6期361-375,共15页
BACKGROUND Existing research has demonstrated that depression is positively related to smartphone addiction, but the role of sleep has not been discussed thoroughly, especially among engineering undergraduates affecte... BACKGROUND Existing research has demonstrated that depression is positively related to smartphone addiction, but the role of sleep has not been discussed thoroughly, especially among engineering undergraduates affected by the coronavirus disease 2019 pandemic.AIM To evaluate sleep as a mediator of the association between smartphone addiction and depression among engineering undergraduates.METHODS Using a multistage stratified random sampling method, a cross-sectional survey was conducted among 692 engineering undergraduates from a top engineering university in China, and data were collected by self-reported electronic questionnaires. The data included demographic characteristics, such as age, gender, the Smartphone Addiction Scale-Short Version(SAS-SV), the 9-item Patient Health Questionnaire, and the Pittsburgh Sleep Quality Index. Pearson correlation and multiple linear regression analyses were used to examine the association between smartphone addiction and depression, while structural equation models were established to evaluate the possible mediating role of sleep.RESULTS Based on the cutoffs of the SAS-SV, the rate of smartphone addiction was 63.58 percent, with 56.21 percent for women and 65.68 percent for men, among 692 engineering students. The prevalence of depression among students was 14.16 percent, with 17.65 percent for women, and 13.18 percent for men. Smartphone addiction was positively correlated with depression, and sleep played a significant mediating effect between the two, accounting for 42.22 percent of the total effect. In addition, sleep latency, sleep disturbances, and daytime dysfunction significantly mediated the relationship between depression and smartphone addiction. The mediating effect of sleep latency was 0.014 [P < 0.01;95% confidence interval(CI): 0.006-0.027], the mediating effect of sleep disturbances was 0.022(P < 0.01;95%CI: 0.011-0.040), and the mediating effect of daytime dysfunction was 0.040(P < 0.01;95%CI: 0.024-0.059). The influence of sleep latency, sleep disturbances, and daytime dysfunction accounted for 18.42%, 28.95%, and 52.63% of the total mediating effect, respectively.CONCLUSION The results of the study suggest that reducing excessive smartphone use and improving sleep quality can help alleviate depression. 展开更多
关键词 Smartphone addiction DEPRESSION Pittsburgh Sleep Quality index engineering students COVID-19 Mediating effect
下载PDF
Spatiotemporal Evolution of Ecological Quality in Alpine Freshwater Lake Nature Reserves in the Past 20 Years
3
作者 Denghong HUANG Chenli LIAO +1 位作者 Zhenzhen ZHANG Jintong REN 《Meteorological and Environmental Research》 2024年第2期29-36,共8页
The Caohai Nature Reserve is one of the three major plateau freshwater lakes in China.Since the 1950s,human activities such as land reclamation and population relocation have greatly damaged Caohai.A rapid evaluation ... The Caohai Nature Reserve is one of the three major plateau freshwater lakes in China.Since the 1950s,human activities such as land reclamation and population relocation have greatly damaged Caohai.A rapid evaluation of the spatiotemporal evolution trend of the ecological quality of the Caohai Nature Reserve is significant for the maintenance and construction of the ecosystem in this area.The research is based on the Google Earth Engine(GEE)remote sensing cloud computing platform.Landsat TM/OLI images from May to October in five time periods:2000-2002,2004-2006,2009-2011,2014-2016,and 2019-2021 were obtained to reconstruct the optimal cloud image set by averaging the images in each time period.By constructing four ecological indicators:Greenness(NDVI),Wetness(Wet),Hotness(LST),and Dryness(NDBSI),and using Principal Component Analysis(PCA)method to obtain the Remote Sensing Ecological Index(RSEI)for the corresponding years,the spatiotemporal variation of ecological quality in the Caohai Nature Reserve over 20 years was analyzed.The results indicate:①the mean value of RSEI increased from 0.460 in 2000-2002 to 0.772 in 2019-2021,a 67.83%increase,indicating a significant improvement in the ecological quality of the reserve over the 20 years;②from the perspective of functional zoning of the Caohai Nature Reserve,the ecological quality of the core area showed a degrading trend,while the ecological quality of the buffer zone and experimental zone significantly improved;③with the implementation of ecological restoration projects,the ecological quality of the reserve gradually recovered and improved from 2014 to 2021.The trend of RSEI value changes is well correlated with human interventions,indicating that the PCA-based RSEI model can be effectively used for ecological quality assessment in lake areas. 展开更多
关键词 Ecological restoration Ecological quality Remote sensing ecological index Google Earth Engine Caohai Nature Reserve
下载PDF
基于GEE和RSEI的京津冀地区生态环境质量时序动态评估 被引量:1
4
作者 辛会超 郭玮 王贺封 《西北林学院学报》 CSCD 北大核心 2024年第2期106-114,共9页
探究京津冀地区生态环境质量时空变化特征及其驱动因素,为该地区可持续协调、高质量一体化发展提供依据。基于MODIS数据,借助Google Earth Engine(GEE)平台构建遥感生态指数(RSEI)模型,辅以多种空间分析和统计方法对京津冀地区及其4大... 探究京津冀地区生态环境质量时空变化特征及其驱动因素,为该地区可持续协调、高质量一体化发展提供依据。基于MODIS数据,借助Google Earth Engine(GEE)平台构建遥感生态指数(RSEI)模型,辅以多种空间分析和统计方法对京津冀地区及其4大功能区生态环境质量进行评价和变化监测。结果表明,1)京津冀地区RSEI均值由2001年的0.512增至2020年的0.575,增幅达12.30%,多年均值为0.499,总体处于中等水平。2)生态环境质量整体呈现“西北优、东南差”的空间格局,35.87%的区域变好,以变好1个等级为主。3)各功能区生态环境质量均得到了改善,其中南部功能拓展区、中部核心功能区的改善最为显著,改善区域占比分别为49.66%、45.79%。4)各因子对生态环境质量的影响不同,自然因素中的降水以及人为因素中的人口和土地利用为主导因素。总的来说,京津冀地区2001-2020年生态环境质量向好,但未来仍需加强人工干预,持续扩大生态优良区。 展开更多
关键词 遥感生态指数 生态环境质量 谷歌地球引擎 时空变化 京津冀
下载PDF
Journal of Transportation Systems Engineering and Information Technology Author Index Page number refers tothe first page of paper
5
《交通运输系统工程与信息》 EI CSCD 2006年第6期182-186,共5页
关键词 PING PAGE Journal of Transportation Systems engineering and Information Technology Author index Page number refers tothe first page of paper
下载PDF
Journal of Transportation Systems Engineering and Information Technology Subject Index Page number refers tothe first page of paper
6
《交通运输系统工程与信息》 EI CSCD 2006年第6期174-181,共8页
关键词 PAGE Journal of Transportation Systems engineering and Information Technology Subject index Page number refers tothe first page of paper MODE
下载PDF
Engineering the Smart Factory 被引量:7
7
作者 HARRISON Robert VERA Daniel AHMAD Bilal 《Chinese Journal of Mechanical Engineering》 SCIE EI CAS CSCD 2016年第6期1046-1051,共6页
The fourth industrial revolution promises to create what has been called the smart factory. The vision is that within such modular structured smart factories, cyber-physical systems monitor physical processes, create ... The fourth industrial revolution promises to create what has been called the smart factory. The vision is that within such modular structured smart factories, cyber-physical systems monitor physical processes, create a virtual copy of the physical world and make decentralised decisions. This paper provides a view of this initiative from an automation systems perspective. In this context it considers how future automation systems might be effectively configured and supported through their lifecycles and how integration, application modelling, visualisation and reuse of such systems might be best achieved. The paper briefly describes limitations in current engineering methods, and new emerging approaches including the cyber physical systems (CPS) engineering tools being developed by the automation systems group (ASG) at Warwick Manufacturing Group, University of Warwick, UK. 展开更多
关键词 index terms--smart factory Industry 4.0 automation systems cyber-physical systems engineerING LIFECYCLE
下载PDF
基于GEE平台和RSEI模型的淅川县生态空间格局演化与评估
8
作者 张大志 包民伟 +2 位作者 付一鸣 张山 王昭 《河南科学》 2023年第5期654-662,共9页
淅川县作为南水北调中线工程的核心水源区和渠首所在地,其生态环境质量的变化与输水安全和工程效益息息相关,需要透彻理解该地区生态空间及生态环境质量的演变机理.利用GEE平台土地利用数据和遥感生态指数(RSEI)模型,分析并刻画了1990—... 淅川县作为南水北调中线工程的核心水源区和渠首所在地,其生态环境质量的变化与输水安全和工程效益息息相关,需要透彻理解该地区生态空间及生态环境质量的演变机理.利用GEE平台土地利用数据和遥感生态指数(RSEI)模型,分析并刻画了1990—2021年间淅川县生态空间格局演化情况,得出以下结论:①丹江口水库东部边缘区是生态空间转化较为剧烈的区域,且转换关系时间分异较为明显,1990—2000年间主要为生态用地向半生态/弱生态用地的转换;2010年后则主要是半生态用地向生态用地的转换.②淅川县的RSEI整体呈现增加态势,且有较为明显的阶段性,1990—2008年的RSEI均值为0.65,在2008—2021年时的RSEI均值增加到了0.70,表明淅川县的生态质量有所上升.③在1990—2000年间,厚坡镇东部、西簧乡和毛堂乡生态质量有所下降,但在2000年后出现好转;在2010—2021年间,全县各地生态质量提升面积最为明显.本研究对淅川县长期以来的生态状况进行分析,提升了研究区生态环境质量评价的精度和深度,为进一步掌握该地区生态演变机理提供了有力数据支撑. 展开更多
关键词 遥感大数据云计算平台 遥感生态指数 土地利用 生态空间 动态监测
下载PDF
Spatiotemporal changes of eco-environmental quality based on remote sensing-based ecological index in the Hotan Oasis,Xinjiang 被引量:3
9
作者 YAO Kaixuan Abudureheman HALIKE +1 位作者 CHEN Limei WEI Qianqian 《Journal of Arid Land》 SCIE CSCD 2022年第3期262-283,共22页
The rapid economic development that the Hotan Oasis in Xinjiang Uygur Autonomous Region,China has undergone in recent years may face some challenges in its ecological environment.Therefore,an analysis of the spatiotem... The rapid economic development that the Hotan Oasis in Xinjiang Uygur Autonomous Region,China has undergone in recent years may face some challenges in its ecological environment.Therefore,an analysis of the spatiotemporal changes in ecological environment of the Hotan Oasis is important for its sustainable development.First,we constructed an improved remote sensing-based ecological index(RSEI)in 1990,1995,2000,2005,2010,2015 and 2020 on the Google Earth Engine(GEE)platform and implemented change detection for their spatial distribution.Second,we performed a spatial autocorrelation analysis on RSEI distribution map and used land-use and land-cover change(LUCC)data to analyze the reasons of RSEI changes.Finally,we investigated the applicability of improved RSEI to arid area.The results showed that mean of RSEI rose from 0.41 to 0.50,showing a slight upward trend.During the 30-a period,2.66% of the regions improved significantly,10.74% improved moderately and 32.21% improved slightly,respectively.The global Moran's I were 0.891,0.889,0.847 and 0.777 for 1990,2000,2010 and 2020,respectively,and the local indicators of spatial autocorrelation(LISA)distribution map showed that the high-high cluster was mainly distributed in the central part of the Hotan Oasis,and the low-low cluster was mainly distributed in the outer edge of the oasis.RSEI at the periphery of the oasis changes from low to high with time,with the fragmentation of RSEI distribution within the oasis increasing.Its distribution and changes are predominantly driven by anthropologic factors,including the expansion of artificial oasis into the desert,the replacement of desert ecosystems by farmland ecosystems,and the increase in the distribution of impervious surfaces.The improved RSEI can reflect the eco-environmental quality effectively of the oasis in arid area with relatively high applicability.The high efficiency exhibited with this approach makes it convenient for rapid,high frequency and macroscopic monitoring of eco-environmental quality in study area. 展开更多
关键词 remote sensing-based ecological index Google Earth Engine spatial autocorrelation analysis eco-environmental quality arid area
下载PDF
Journal of Transportation Systems Engineering and Information Technology Subject Index 被引量:3
10
《交通运输系统工程与信息》 EI CSCD 2007年第6期129-135,共7页
关键词 Journal of Transportation Systems engineering and Information Technology Subject index MODE
下载PDF
基于RSEI指数的长江上游流域生态环境质量时空演变及影响因子研究 被引量:12
11
作者 章程焱 杨少康 +3 位作者 董晓华 赵程铭 薄会娟 刘冀 《水土保持研究》 CSCD 北大核心 2023年第1期356-363,共8页
为准确、及时地获取长江上游生态环境质量的变化趋势以及演变格局,基于Google Earth Engine(GEE)平台的MODIS系列遥感数据,通过计算长江上游流域生长季5—10月的绿度(NDVI)、湿度(WET)、热度(LST)及干度(NDSI)4个指标,采用主成分分析法(... 为准确、及时地获取长江上游生态环境质量的变化趋势以及演变格局,基于Google Earth Engine(GEE)平台的MODIS系列遥感数据,通过计算长江上游流域生长季5—10月的绿度(NDVI)、湿度(WET)、热度(LST)及干度(NDSI)4个指标,采用主成分分析法(PCA)构建出遥感生态环境指数RSEI,并对长江上游流域生态环境进行评价。结果表明:(1) 4个指标在第1主成分(PC1)上的平均贡献率为71%,表明依据这4个指标在长江上游流域构建RSEI是可行的;(2)长江上游流域RSEI整体呈现显著增加趋势(p<0.05),增加速率为1.1×10^(-3)/a,具体可细分为两个阶段,分别是快速增长期(2000—2010年),其速率为5.9×10^(-3)/a,以及增速放缓期(2010—2020年),其速率为3.9×10^(-3)/a;(3)长江上游流域生态环境质量以优和良为主,且表现为南部比北部好及东部比西部好的空间分布格局;(4) 2000—2010年流域生态环境质量改善明显,改善面积占34.7%,2010—2020年改善面积与退化面积接近,两者仅差1.3%左右;(5) 2000—2020年长江上游流域RSEI变化趋势为正的像元面积占长江上游流域总面积的64.7%,其中显著退化的区域主要集中在嘉陵江下游地区;(6)生态环境质量主导自然影响因子在2000年为热度>绿度>湿度>干度;2010年依次为绿度>热度>湿度>干度;2020年依次为绿度>湿度>热度>干度。综上,利用GEE平台能快速、准确地监测长江上游流域生态环境质量,近21年来流域生态环境质量整体呈改善态势,但针对嘉陵江下游生态退化现象需要引起政府重视,尽快提出一系列生态修复措施,防止其生态环境进一步恶化。 展开更多
关键词 遥感生态环境指数 长江上游流域 时空特征 Google Earth Engine 地理探测器
下载PDF
Spatial-temporal changes and driving factors of eco-environmental quality in the Three-North region of China 被引量:3
12
作者 LONG Yi JIANG Fugen +2 位作者 DENG Muli WANG Tianhong SUN Hua 《Journal of Arid Land》 SCIE CSCD 2023年第3期231-252,共22页
Eco-environmental quality is a measure of the suitability of the ecological environment for human survival and socioeconomic development.Understanding the spatial-temporal distribution and variation trend of eco-envir... Eco-environmental quality is a measure of the suitability of the ecological environment for human survival and socioeconomic development.Understanding the spatial-temporal distribution and variation trend of eco-environmental quality is essential for environmental protection and ecological balance.The remote sensing ecological index(RSEI)can quickly and objectively quantify eco-environmental quality and has been extensively utilized in regional ecological environment assessment.In this paper,Moderate Resolution Imaging Spectroradiometer(MODIS)images during the growing period(July-September)from 2000 to 2020 were obtained from the Google Earth Engine(GEE)platform to calculate the RSEI in the three northern regions of China(the Three-North region).The Theil-Sen median trend method combined with the Mann-Kendall test was used to analyze the spatial-temporal variation trend of eco-environmental quality,and the Hurst exponent and the Theil-Sen median trend were superimposed to predict the future evolution trend of eco-environmental quality.In addition,ten variables from two categories of natural and anthropogenic factors were analyzed to determine the drivers of the spatial differentiation of eco-environmental quality by the geographical detector.The results showed that from 2000 to 2020,the RSEI in the Three-North region exhibited obvious regional characteristics:the RSEI values in Northwest China were generally between 0.2 and 0.4;the RSEI values in North China gradually increased from north to south,ranging from 0.2 to 0.8;and the RSEI values in Northeast China were mostly above 0.6.The average RSEI value in the Three-North region increased at an average growth rate of 0.0016/a,showing the spatial distribution characteristics of overall improvement and local degradation in eco-environmental quality,of which the areas with improved,basically stable and degraded eco-environmental quality accounted for 65.39%,26.82%and 7.79%of the total study area,respectively.The Hurst exponent of the RSEI ranged from 0.20 to 0.76 and the future trend of eco-environmental quality was generally consistent with the trend over the past 21 years.However,the areas exhibiting an improvement trend in eco-environmental quality mainly had weak persistence,and there was a possibility of degradation in eco-environmental quality without strengthening ecological protection.Average relative humidity,accumulated precipitation and land use type were the dominant factors driving the spatial distribution of eco-environmental quality in the Three-North region,and two-factor interaction also had a greater influence on eco-environmental quality than single factors.The explanatory power of meteorological factors on the spatial distribution of eco-environmental quality was stronger than that of topographic factors.The effect of anthropogenic factors(such as population density and land use type)on eco-environmental quality gradually increased over time.This study can serve as a reference to protect the ecological environment in arid and semi-arid regions. 展开更多
关键词 eco-environmental quality remote sensing ecological index Google Earth Engine Hurst exponent geographical detector Three-North region of China
下载PDF
ICPCSEE(Originally ICYCSEE)2017第三届国际计算机前沿大会(原国际青年计算机大会)征稿通知(SCI or EI Indexed)(英文)
13
《小型微型计算机系统》 CSCD 北大核心 2017年第2期303-303,380,共2页
September 22-24,2017,Changsha,China The Third International Conference of Pioneering Computer Scientists,Engineers and Educators(ICPCSEE,originally ICYCSEE)2017(http://2017.icpcsee.org)w ill be held in Changsha,China,... September 22-24,2017,Changsha,China The Third International Conference of Pioneering Computer Scientists,Engineers and Educators(ICPCSEE,originally ICYCSEE)2017(http://2017.icpcsee.org)w ill be held in Changsha,China,Sept 22-24 2017,hosted by Central South University and Computer Education Committee Hunan Higher Education Federation. 展开更多
关键词 SCI or ei indexed ei Originally ICYCSEE)2017 ICPCSEE 计算机 英文 青年
下载PDF
武汉理工大学学报(交通科学与工程版)近年被美国工程信息公司Ei(Engineering information)数据库收录情况一览表
14
作者 本刊通讯员 《武汉理工大学学报(交通科学与工程版)》 2008年第6期1078-1078,共1页
关键词 ISSN 收文 ei engineering information
下载PDF
Health risk assessment of heavy metals in soils and crops in a mining area(Au-Ag-Cutrona-oil et al.) of the Nanyang Basin, Henan Province, China 被引量:2
15
作者 Qiu-yao Dong Hao-tian Wen +5 位作者 Pan Wang Chao Song Shu-ya Lai Zhen-jing Yang Yuan-yi Zhao Ming-jiang Yan 《China Geology》 CAS CSCD 2023年第4期567-579,共13页
Heavy metal distribution in mining areas has always been a hot research topic due to the special environment of these areas. This study aims to explore the impact of heavy metal pollution on soils and crops in the stu... Heavy metal distribution in mining areas has always been a hot research topic due to the special environment of these areas. This study aims to explore the impact of heavy metal pollution on soils and crops in the study area, ensure the safety of local crops and the health of local residents, and provide a basis for the subsequent environmental restoration and the prevention and control of environmental pollution. Based on the analysis of the heavy metal concentrations in local soils and crops, the study investigated the spatial distribution, pollution degrees, and potential ecological risks of heavy metals in the farmland of a mining area in the southeastern Nanyang Basin, Henan province, China explored the sources of heavy metals and assessed the health risks caused by crop intake. The results of this study are as follows. The root soils of crops in the study area suffered heavy metal pollution to varying degrees. The degree of heavy metal pollution in maize fields is higher than that in wheat fields, and both types of fields suffer the most severe Cd pollution. Moreover, the root soils of different crops suffer compound pollution.The root soils in the maize fields suffer severe compound pollution at some sampling positions, whose distribution is similar to that of the mining area. Cd poses the highest potential ecological risks among all heavy metals, and the study area mainly suffers low and moderate comprehensive potential ecological risks. The principal component analysis(PCA) shows that the distribution of Zn, Cd, Pb, and As in soils of the study area is mainly affected by anthropogenic factors such as local mining activities;the distribution of Cr and Ni is primarily controlled by the local geological background;the distribution of Hg is mainly affected by local vehicle exhaust emissions, and the distribution of Cu is influenced by both human activities and the geological background. Different cereal crops in the study area are polluted with heavy metals dominated by Cd and Ni to varying degrees, especially wheat. As indicated by the health risk assessment results, the intake of maize in the study area does not pose significant human health risks;however, Cu has high risks to human health, and the compound heavy metal pollution caused by the intake of wheat in the study area poses risks to the health of both adults and children. Overall, the soils and crops in the study area suffer a high degree of heavy metal pollution, for which mining activities may be the main reason. 展开更多
关键词 Heavy metal Zn-Cd-Pb pollution Cr-Ni pollution As pollution Natural ecosystem Health risk assessment Adult-children health risk Ecological risk index(ERI) Ecological geological engineering Mining activity
下载PDF
Chinese Journal of Chemical Engineering Author Index to 2005
16
《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2005年第6期853-860,共8页
关键词 LI OVER HE Chinese Journal of Chemical engineering Author index to 2005 NG
下载PDF
A Preliminary Study on Systems Engineering-Based Method for the Evaluation of Allelopathic Potential in Crops and Its Application
17
作者 ZUO Sheng-peng MA Yong-qing 《Agricultural Sciences in China》 CAS CSCD 2007年第1期68-77,共10页
The objective of this study was to develop a method to assess and analyze the total allelopathic potential of crop germplasm and to test this method on four winter wheat accessions commonly planted in the Loess Platea... The objective of this study was to develop a method to assess and analyze the total allelopathic potential of crop germplasm and to test this method on four winter wheat accessions commonly planted in the Loess Plateau. A systems engineering model was developed and used to evaluate the total allelopathic potential of crop cultivars. In addition, a method for quantifying the total allelopathic potential in crop accessions was presented. Total allelopathic potential of four winter wheat accessions from the Loess Plateau was estimated and compared using a systems theory approach. The model assessed allelopathic potential in different parts of the plants from the time wheat turned green in spring until maturity. Results from these models indicated that the four wheat accessions had very weak allelopathic potential. Allelopathic potential declined in the order Xiaoyan 22 〉 Ningdong 1 〉 Fengchan 3 〉 Bima 1. This system engineering evaluation method allows for the assessment of allelopathic potential among crop varieties. It will help plant breeders to select and develop allelopathic crop accessions that combine weed suppression properties with agronomic traits related to yield and quality. 展开更多
关键词 systems engineering principles evaluation of crop allelopathic potential synergetic indices of allelopathic potential comprehensive index of allelopathic potential genetic breeding of allelopathic crop accessions
下载PDF
Trajectory engineering via a space-fractional Schrodinger equation with dynamic linear index potential
18
作者 孟云吉 刘友文 吕海江 《Chinese Physics B》 SCIE EI CAS CSCD 2020年第5期229-234,共6页
We theoretically and numerically study the propagation dynamics of a Gaussian beam modeled by the fractional Schrodinger equation with different dynamic linear potentials. For the limited case α = 1(α is the Lé... We theoretically and numerically study the propagation dynamics of a Gaussian beam modeled by the fractional Schrodinger equation with different dynamic linear potentials. For the limited case α = 1(α is the Lévy index) in the momentum space, the beam suffers a frequency shift which depends on the applied longitudinal modulation and the involved chirp. While in the real space, by precisely controlling the linear chirp, the beam will exhibit two different evolution characteristics: one is the zigzag trajectory propagation induced by multi-reflection occurring at the zeros of spatial spectrum,the other is diffraction-free propagation. Numerical simulations are in full accordance with the theoretical results. Increase of the Lévy index not only results in the drift of those turning points along the transverse direction, but also leads to the delocalization of the Gaussian beam. 展开更多
关键词 trajectory engineering space-fractional Schrodinger equation dynamic linear index potential
下载PDF
JOURNAL OF SYSTEMS ENGINEERING AND ELECTRONICS AUTHOR INDEX
19
《Journal of Systems Engineering and Electronics》 SCIE EI CSCD 2012年第6期949-951,共3页
关键词 WANG CHEN JOURNAL OF SYSTEMS engineerING AND ELECTRONICS AUTHOR index ZHANG
下载PDF
JOURNAL OF SYSTEMS ENGINEERING AND ELECTRONICS AUTHOR INDEX
20
《Journal of Systems Engineering and Electronics》 SCIE EI CSCD 2006年第4期938-939,共2页
关键词 WANG CHEN JOURNAL OF SYSTEMS engineerING AND ELECTRONICS AUTHOR index LI
下载PDF
上一页 1 2 125 下一页 到第
使用帮助 返回顶部