2004-2010年中国地震台网中心科研论文产出状况分析

以科学引文数据库为资料来源,分析了中国地震台网中心2004-2010年科研论文的产出状况.结果显示,中国地震台网中心自2004年10月成立以来,科技人员在科研活动中的主导地位逐步增强,发表论文的质量提高较快,论文的被引用量及下载量均大幅增加,不同研究领域发表论文的情况差别较大,地震预测预报、震灾应急救援等方面的论文科研影响力较大.     

基于体验视角的历史街区旅游复兴——以福州市三坊七巷为例

目前国内历史街区在旅游开发上存在模式雷同、体验质量相似等问题,从旅游体验视角探讨了历史街区旅游复兴的新思路,分析了历史街区旅游体验要素,提出包含审美怀旧、文化教育、休闲娱乐、遁世逃避、社交生活和情感升华在内的6E体验模型及各体验要素营造方法。以福州市三坊七巷旅游发展策划为例,具体阐释了6E模型在历史街区旅游复兴中的应用,结合体验的层次性、综合性和场地分析,将整个街区由动到静、由表层到深度体验过渡,依次划分为南后老街摩尔、温馨休闲之巷、安泰水岸风情和小众定制名坊四个功能区。应用6E模型解决历史街区旅游功能分区和产品策划,有益于从文化、社会、经济层面上再造老街区的鲜活面貌,是一种可持续发展的思路。     

空间信息支持下的电子政务及其展望

我国电子政务建设正在成为国民经济和社会其他领域信息化的先行者。政府的大量信息与空间位置有关 ,作为一个战略措施 ,空间数据基础设施已经被列为家国信息化建设的重点任务之一。从四个方面阐述了空间数据在电子政务建设中的基础作用。尽管现代GIS提供了许多基于数据的高级分析功能 ,以空间数据承载各种专业数据并实现其可视化是GIS的最基本功能 ,通过这种看来似乎寻常的信息查询服务 ,它所启动的用户视觉与神经器官的内在联想能力 ,及其对分布图形的记忆、分析与推演作用 ,远远超过了可视化自身所提供的直接效果。而在这种简单显示的背后 ,大型GIS潜藏着十分复杂的空间数据的组织与管理调度技术     

An Overview of Long-Term Trends in the Lower Ionosphere Below 120 km

The increasing concentration of greenhouse gases in the atmosphere is expectedalso to modify the mesosphere and lower thermosphere (MLT region). However,the greenhouse cooling – instead of heating – at these heights is revealed by modelsand generally confirmed by observations. This should more or less affect variousionospheric parameters at these heights. The spatial and temporal structure oftemperature trends in the MLT region is quite complex and, therefore, such structureshould occur for trends in the lower ionosphere as well. In the lower part of theionosphere below about 90 km, the rocket measurements of electron density, theindirect phase reflection height measurements and the A3 radio wave absorptionmeasurements reveal trends corresponding to cooling and shrinking of the mesosphere,while riometric measurements of cosmic noise absorption provide inconclusive results.The radio wave absorption and rocket electron density measurements clearly display asubstantial dependence of trends on height. Ionosonde data show that there is amodel-expected trend in the maximum electron concentration of the E region ionosphere;foE is slightly increasing. On the other hand, the height of the normal E layer, h'E, isslightly decreasing. The nighttime LF radio wave reflection height measurements near95 km support an idea of increasing electron density. However, rather scarce rocketmeasurements display a negative trend in electron density at 90–120 km. The role ofthe solar cycle and other longer-term variability of natural origin in the determinationof observational trends must not be neglected. In spite of the general qualitativeagreement with model expectations, there is still some controversy between variousobservational trend results (hopefully, apparent rather than real), which needs to beclarified.     

The capture of interstellar dust: the Lorentz force case

The capture of arbitrarily shaped interstellar dust in the Solar System is investigated. Electromagnetic radiation and gravitational forces of the Sun and Lorentz force generated by interplanetary magnetic field are considered. The capture conditions appear to be very sensitive to the particle shape. Non-spherical particles as well as their spherical equivalents are captured only when they are moving initially in the vicinity of ecliptic plane. Capture of non-charged non-spherical dust typically occurs in the region , where R_Sun is solar radius and impact parameter b is defined as the smallest distance between the particle and the Sun if no forces existed. In contrast, charged particles are typically captured at b>150 R_Sun. The total amount of captured non-spherical sub-micron particles differs significantly from the corresponding amount of spherical dust grains. However, both amounts are comparable in the micron-sized range. It is shown that a certain mass of captured non-spherical particles may survive in the Solar System, while captured spherical ones hit the Sun or sublimate in its vicinity. Only a negligible amount of spherical particles can survive. Consideration of solar wind within around of yields that 20% of the captured non-spherical particles of the effective radius survive; the corresponding percentage for particles of the radius is 7%. The total mass of the surviving charged particles is about two orders of magnitude larger than the mass of the surviving non-charged particles. As a result, the sub-micron-sized particles are candidates to contribute to the density increase of the circumsolar dust cloud.     

中国季风降水与赤道东太平洋海温的关系*

本文根据近38年(1951—1988年)海平面气压场与我国160个站降水的冬夏距平值,研究了季风降水与赤道东太平洋海温(SST)变化的关系,发现两者有联系的年占一定优势。季风降水与SST的关系虽非逐年对应,但SST异常对东亚季风气压场的年际变化及我国降水变化仍是一个不可忽视的影响因素。     

El Nino对云南初夏降水的影响

利用云南初夏５－６月的降水资料，全球月平均海温资料及热带ＯＬＲ资料，研究了云南初夏５－６月降水对海气相互作用特别是Ｅｌ Ｎｉｎｏ的响应，发现云南初夏降水与赤道东太平洋海温变化以及南海对流活动有密切关系。     

FY-2E卫星资料在基于LAPS的台风三维云分析中的应用

LAPS(Local Analysis and Prediction System)采用物理初值化与三维变分约束相结合的方法,通过融合多源观测资料,发挥各种资料的优势,分析得到较为客观的三维云场,并可改善数值模式初始场。将FY-2E卫星可见光反照率和红外亮温资料引入LAPS,针对2014年6月登陆我国的台风"海贝思",设计不同水平分辨率的同化试验,研究台风三维云结构和初始场的改善情况。结果表明:1)LAPS云分析中引入卫星可见光反照率资料之后,总云量有显著的调整,能够较清晰地分辨出台风眼区、云墙和螺旋云带,卫星红外亮温资料在云顶高度的调整中发挥了重要作用,而且高分辨率的云分析结果有助于更好地分析出台风结构和强对流区域。2)LAPS物理初值化技术将卫星资料中的云结构和微物理信息添加到初始场中,一定程度上调整了数值模式初始场中垂直速度、云水、云冰和水汽场等变量的分布,提高了模式初值质量,对模拟和预报台风系统将会产生一定的影响。