旅游网站的性能及其发展态势   总被引：27，自引：2，他引：25  

路紫  白翠玲 《地球信息科学学报》2001,3(1):63-66

 本文对旅游网站的基本概念的内涵及我国旅游网站的演变过程进行了剖析,通过由Yahoo搜索的我国旅游网站的资料,对我国现状旅游网站的类型进行了划分,“内容、方式、功能、规模”四大问题进行了探讨,对中国旅游网站的联邦式的“一统”化中的三个结合趋势、依托传统行业实体和专业产业资源后盾发展电子商务,在信息化基础上提高对使用关系的管理水平进行了展望。旅游网站作为网络经济形势下旅游业发展的一种战略武器,已对我国旅游市场的固有壁垒带来冲击,我国旅游电子商务在未来的发展中尚有许多工作要做  相似文献   

大学生政治观教育内容的系统分析     

许浩 《广东海洋大学学报》2005,25(2):125-129

政治观教育是思想政治教育的一项重要内容。研究大学生政治观的教育内容,构建并宣扬一种既符合主导政治观,又紧随时代脉搏跳动的政治理念、政治情感的内容体系,正是关系大学生政治素质的养成,国家人才强国战略的实施,社会主义政治文明提升的重大课题。在新的历史时期,大学生政治观教育内容主要包括六个方面,以国家观和民族观为主导,形成了一个有机的整体。  相似文献   

海洋自然资源国民经济评价体系的探讨     

卢秀容 《广东海洋大学学报》2003,23(5):29-33

海洋开发主体在开发利用海洋自然资源时 ,往往会产生负的外部性 ,所以在对项目中费用和效益识别的基础上应加强海洋开发项目的国民经济评价 ,其中采用的主要经济指标有经济净现值、经济净现值率、经济内部收益率、经济外汇净现值和经济换汇成本  相似文献   

有线光纤电视综述     

沈镇芳 《成都信息工程学院学报》1997,(1)

有线电视ＣＡＴＶ正在迅速深入千家万户。有线光纤电视网将是２１世纪地面的主要广播形式。“信息高速公路”是将电脑、电话、电视结合在一起的通信网络。有线光纤电视网是“信息高速公路”的重要组成部分之一  相似文献   

Accessing High Pressure States Relevant to Core Conditions in the Giant Planets     

B. A. Remington  R. M. Cavallo  M. J. Edwards  D. D.-M. Ho  B. F. Lasinski  K. T. Lorenz  H. E. Lorenzana  J. M. Mcnaney  S. M. Pollaine  R. F. Smith 《Astrophysics and Space Science》2005,298(1-2):235-240

We have designed an experimental technique to use on the National Ignition Facility (NIF) laser to achieve very high pressure (P _max > 10 Mbar = 1000 GPa), dense states of matter at moderate temperatures (T < 0.5 eV = 6000 K), relevant to the core conditions of the giant planets. A discussion of the conditions in the interiors of the giant planets is given, and an experimental design that can approach those conditions is described.  相似文献   

上海地区GPS综合应用网数据采集处理中心及其自动化处理软件简介     

CHENG Zongyi ZHUANG Xuejuan 《中国科学院上海天文台年刊》2004,(1)

上海地区GPS综合应用网的数据采集处理中心设立在上海天文台 ,经过两年多的实时运行 ,网络设备及处理计算机等相对稳定 ,处理软件也渐趋成熟和完善 ;介绍了GPS数据采集处理中心的网络结构、数据自动化处理软件。  相似文献   

面向对象与卷积神经网络模型的GF-6 WFV影像作物分类   总被引：1，自引：0，他引：1  

李前景  刘珺  米晓飞  杨健  余涛 《遥感学报》2021,25(2):549-558

GF-6 WFV影像是中国首颗带有红边波段的中高分辨率8波段多光谱卫星的遥感影像,对于其影像及红边波段对作物分类影响的研究利用亟待展开。本文结合面向对象和深度学习提出一种适用于GF-6 WFV红边波段的卷积神经网络(RE-CNN)遥感影像作物分类方法。首先采用多尺度分割和ESP工具选择最佳分割参数完成影像分割,通过面向对象的CART决策树消除椒盐现象的同时提取植被区域,并转化为卷积神经网络的输入数据,最后基于Python和Numpy库构建的卷积神经网络模型(RE-CNN)用于影像作物分类及精度验证。有无红边波段的两组分类实验结果表明:在红边波段组,卷积神经网络(RE-CNN)作物分类识别取得了较好的效果,总体精度高达94.38%,相比无红边波段组分类精度提高了2.83%,验证了GF-6 WFV红边波段对作物分类的有效性。为GF-6 WFV红边波段影像用于作物的分类研究提供技术参考和借鉴价值。  相似文献   

Seeing the forest and the trees: Facilitating participatory network planning in environmental governance     

《Global Environmental Change》2015

Governance processes to address environmental change involve many different actors from multiple spatial, temporal and socio-political scales, not all of whom are connected by hierarchy and whose actions cannot always be mandated. In the environmental governance literature, Social Network Analysis (SNA) has been found useful in understanding complex governance arrangements. In this paper we present and reflect on our experience with the Net-Map tool for participatory network mapping. The Net-Map tool was applied in three transdisciplinary case studies for three different purposes: (a) to contribute to an improved understanding of biodiversity knowledge flows in Europe, (b) to explore the interplay between actors with influence on water, agriculture, and energy developments at the Blue Nile in Ethiopia, and (c) to understand the challenges facing stakeholders engaged in conservation and economic development in a Southeast Asian mountain range. The case studies explore how network maps can serve as boundary objects to engage stakeholders of diverse points of view and jointly design strategies to address governance challenges. More specifically they show how network maps are used to gain a better understanding of governance situations, to help stakeholders identify strategies for navigation of the complex networks in which they are embedded and to support transdisciplinary research processes. We close with some reflections on the potential and limitations of the Net-Map tool in facilitating multi-stakeholder processes and disentangling complex governance arrangements.  相似文献   

A reporting compliance of national Fisheries Authority of Papua New Guinea     

《Marine Policy》2015

Through textual analysis, this paper takes into account documentary evidence of the Auditor-General׳s audit commentaries of the reporting compliance of the National Fisheries Authority of Papua New Guinea for the period 2006–2012. The results of the analysis show that the National Fisheries Authority׳s financial statements are late, unprepared or qualified. The study suggests ways the authority might improve its reporting compliance at relatively little cost, and how using national reporting compliance instruments may enhance national fisheries policy. The findings are of critical importance for fishing authority local managers, policy-makers and practitioners interested in providing compliant financial and operational reporting to meet the decision needs of its key stakeholders.  相似文献   

Spatial patterns of simulated transpiration response to climate variability in a snow dominated mountain ecosystem     

Lindsey Christensen  Christina L. Tague  Jill S. Baron 《水文研究》2008,22(18):3576-3588

Transpiration is an important component of soil water storage and stream‐flow and is linked with ecosystem productivity, species distribution, and ecosystem health. In mountain environments, complex topography creates heterogeneity in key controls on transpiration as well as logistical challenges for collecting representative measurements. In these settings, ecosystem models can be used to account for variation in space and time of the dominant controls on transpiration and provide estimates of transpiration patterns and their sensitivity to climate variability and change. The Regional Hydro‐Ecological Simulation System (RHESSys) model was used to assess elevational differences in sensitivity of transpiration rates to the spatiotemporal variability of climate variables across the Upper Merced River watershed, Yosemite Valley, California, USA. At the basin scale, predicted annual transpiration was lowest in driest and wettest years, and greatest in moderate precipitation years (R² = 0·32 and 0·29, based on polynomial regression of maximum snow depth and annual precipitation, respectively). At finer spatial scales, responsiveness of transpiration rates to climate differed along an elevational gradient. Low elevations (1200–1800 m) showed little interannual variation in transpiration due to topographically controlled high soil moistures along the river corridor. Annual conifer stand transpiration at intermediate elevations (1800–2150 m) responded more strongly to precipitation, resulting in a unimodal relationship between transpiration and precipitation where highest transpiration occurred during moderate precipitation levels, regardless of annual air temperatures. Higher elevations (2150–2600 m) maintained this trend, but air temperature sensitivities were greater. At these elevations, snowfall provides enough moisture for growth, and increased temperatures influenced transpiration. Transpiration at the highest elevations (2600–4000 m) showed strong sensitivity to air temperature, little sensitivity to precipitation. Model results suggest elevational differences in vegetation water use and sensitivity to climate were significant and will likely play a key role in controlling responses and vulnerability of Sierra Nevada ecosystems to climate change. Copyright © 2008 John Wiley & Sons, Ltd.  相似文献