基于GIS和RS平台的烟田连作区的查询研究     

黄勇奇  赵追 《九江师专学报》2007,26(3):12-15,29

尽量控制烟草生产的连作，逐步建立烤烟合理轮作制度，实施划片轮作，才能实现用地与养地有机结合，有效降低生产成本，提高烟叶产量、质量，增加种烟效益。而只有对烟草种植田块进行查询，得出连作烟田的基本信息，才是控制烟草生产的连作，逐步建立烤烟合理轮作制度的关键所在。本文就如何在遥感技术（RS）和地理信息系统（GIS）技术平台支持下进行烟草连作区查询进行了详细论述。  相似文献   

基于MAPGIS的校园地理信息系统的设计与实现     

黄健  何贞铭 《教育技术导刊》2007,(7)

简要论述了建立校园地理信息系统的必要性,介绍了系统体系结构和模块功能,并对空间数据库的设计进行了探讨。时GIS平台的选择和系统功能的实现做了详细的描述。分析了校园地理信息系统的前景和发展趋势。  相似文献   

可持续发展信息共享公共基础地理信息平台建立和应用   总被引：2，自引：0，他引：2  

蒋景瞳刘若梅周旭贾云鹏 《资源科学》2001,23(1):29-33

在对国家基础地理信息系统数据库进行分析的基础上，结合可持续发展信息数据的特点，提出了可持续发展信息共享所必需的公共基础地理信息平台的建设问题和可持续发展专题信息与公共基础平台数据集成和配准问题，从实用的角度分析了数据集成的复杂性，并提出了解决办法。  相似文献   

基于ArcIMS的赣州市旅游信息系统研究     

张宏兰  周顺平 《教育技术导刊》2007,(5)

万维网地理信息系统(WebGIS)技术的成熟和发展及广泛应用为旅游信息化提供了很好的技术支持。在分析ArcIMS等WebGIS相关技术的基础上,设计了一个基于ArcIMS的旅游信息系统方案,并结合赣州市的旅游信息系统给出了具体实例,主要实现图形数据的在线浏览与编辑。  相似文献   

The Effects of Multimodal Communication Frequency,Geographic Distance,and Coresidence on Parent-Child Relationship Quality During Emerging Adulthood     

Erin M. Sumner  Artemio Ramirez 《Communication Research Reports》2019,36(2):114-125

The present study examined the role of three interrelated factors—multimodal communication frequency, geographic distance, and coresidence—in relation to emerging adult college students’ perceptions of parental relationship quality. Hierarchical regression analyses revealed that emerging adults’ perceptions of relational closeness and communication satisfaction were related to lower levels of face-to-face interaction and higher levels of phone call interaction with their parents. Controlling for communication frequencies, students who lived separate from their parents reported greater communication satisfaction than those who coresided, yet coresidence was unassociated with relational closeness. Finally, geographic distance was unrelated to emerging adults’ perceptions of parental relationship quality.  相似文献   

Who posts scientific tweets? An investigation into the productivity,locations, and identities of scientific tweeters     

Houqiang Yu  Tingting Xiao  Shenmeng Xu  Yuefen Wang 《Journal of Informetrics》2019,13(3):841-855

Twitter altmetrics has been proposed to measure the popularity and the potential societal impact of scientific products, but scientific tweeters who produce the Twitter altmetrics data have not been well explored. The study, by analyzing 2.63 million scientific tweeters’ data that are extracted from the Altmetric.com company dataset, is aimed to reveal their productivity and geographic distribution in a comprehensive way. To gain a more in-depth understanding of their account types and identities, 1468 scientific tweeters of different levels of activeness are sampled for further analysis. Our results show that: (1) The extent to which a small proportion of tweeters have posted most of scientific tweets increases over time. In 2016, 10% of scientific tweeters have posted 80% of scientific tweets; (2) Scientific tweeters are widely distributed around the world but in a different pattern with the distribution of general Twitter users. In addition, scientific tweeters are found to be more active in tweeting scientific products than retweeting them in certain areas. (3) Manual coding of the sampled tweeters shows that the percentage of bot accounts among scientific tweeters is 1.8%, which is much lower than that among general Twitter users. Moreover, 73% of scientific tweeters use Twitter for professional purpose, 76% use real names for their accounts, and 16% are institutional accounts. (4) Identities of scientific tweeters are diversified. 49% of them are researchers among which university faculty is the major type, and 38% of them are the general public. With these results we suggest number of scientific tweets is not a good indicator of measuring either popularity or impact, tweeter’s productivity, location and identities must be taken into consideration in interpreting the meaning of Twitter altmetrics.  相似文献   

Measuring and exploring the geographic mobility of American professors from graduating institutions: Differences across disciplines,academic ranks,and genders     

《Journal of Informetrics》2019,13(3):771-784

This paper proposes two novel measures to study the geographic mobility of faculty members from their graduating institutions in the United States: a continuous measure using geographic distance and a discrete one concerning the concept of Metropolitan Statistical Area (MSA). The joint application of the two novel measures to a hand-collected hiring network dataset including more than 15,000 faculty members in three disparate disciplines (business, computer science, and history) leads to interesting findings regarding geographic mobility of American professors from graduating institutions, defined by relocation distance or cross-MSA from the PhD granting institution and the hiring institution. Overall, American faculty exhibits high geographic mobility from their graduating institutions in terms of relocation distance and cross-MSA moves. History faculty members have the highest mobility while those in business show the lowest mobility. We further find that assistant professors show the highest mobility while full professors show lowest mobility. In addition, while there is little distance difference between male and female faculty members overall, female faculty members are less likely to move between MSAs or regions in the United States.  相似文献   

清末民初科技期刊的传播渠道及其信息流动模式探讨——以《地学杂志》为例     

雷雁林 《编辑学报》2012,24(1):5-7

以《地学杂志》为例,探究清末民初科技期刊的传播渠道及其信息流动模式。研究认为,清末民初,中国科技期刊的传播渠道主要有4种：会员内分发;邮寄、分售、代售;交换、赠阅;以官方渠道进入学堂。其信息流动模式主要有2种：学科共同体内的交流;向社会民众的传播。这2种信息流动模式并不是单向和孤立的,而是形成了循环、融汇、互动的信息流...  相似文献   

基于混合式教学模式的“地理信息系统”教学改革     

赵洁  李成 《教育教学论坛》2022,(6)

“地理信息系统”课程具有多学科交融、理论与实践相结合、内容更新迅速等特点,传统的教学模式难以兼顾知识传授与能力培养的课程教学目标。在“互联网+”时代背景下,融合传统课堂教学与网络在线教学的混合式教学模式依托其先进的教学理念与方法为“地理信息系统”课程改革提供了理论依据与方法支撑。从教学现状出发,阐述了“地理信息系统”教学理论与实践脱节、教学模式单一等问题,基于混合式教学模式,在线上课堂建设、线下课堂改革和综合性考核体系建设等方面提出了一系列改革举措,以期在有限的课时内,拓宽授课容量,优化教学效果,提升课程教学质量。  相似文献   

中国城市科技创新竞争力国际比较研究     

杨云超  刘笑男  刘伟 《科技管理研究》2022,(23)

基于全球城市科技创新竞争力指标体系和1006个50万人以上城市样本数据,利用统计分析、地理探测器等方法深入分析中国城市科技创新竞争力的总体特征和驱动因素,并与全球、美国、欧盟、巴西、印度、俄罗斯进行对比分析,得出如下结论：一是中国头部城市科技创新竞争力已经呈现突围态势,但整体处于全球中等偏下水平;二是中国城市科技创新竞争力的空间分异程度基本与全球平均水平持平,首位度高于美国、欧盟;三是全球联系、社会包容、经济活力、环境韧性是影响中国城市科技创新竞争力的主导因素;四是在提升中国城市科技创新竞争力方面,经济活力和社会包容之间的相互促进作用相对最强,而经济活力和环境韧性相对最弱。  相似文献