Some evidence of drying trend over northern China from 1951 to 2004

The surface wetness index, Palmer drought sererity index and the retrieval of soil moisture over China were calculated using monthly precipitation and monthly mean surface air temperature. Based on the contrast analysis of the variation of the above three indices and precipitation, the dry/wet spatio-temporal pattern of northern China in the last 54 years was revealed, and the evidence of drying trend over northern China was analyzed, especially. The results show the following four facts: (1) The drying trend is the main characteristic of the eastern part of Northwest China and the central part of North China since the 1980s and it was enhanced in the last 15 years mainly due to the precipitation decrease and the temperature increase; (2) During the last 54 years, there was only one dry/wet shift at the interdecadal scale occurring in the eastern part of Northwest China and the central part of North China in the late 1970s, which was related to 1977/1978 global abrupt change, whereas there were three shifts in Northeast China, one was in the mid 1990s and the other two were in 1965 and 1983, respectively; (3) Unlike the variation trend of other subregions of northern China, the western part of Northwest China is currently located in a relatively wetting period, which is weak-ened due to the temperature increase; (4) The extreme drought frequency is obviously increasing in the eastern part of Northwest China, the central part of North China and Northeast China since the 1980s, which is closely related to the precipitation decrease and temperature increase in these subregions.     

Variability of surface circulation in the South China Sea from satellite altimeter data

11-year satellite altimeter sea surface height （SSH） anomaly data from January 1993 to December 2003 are used to present the dominant spatial patterns and temporal variations of the South China Sea （SCS） surface circulation through Empirical Orthogonal Function （EOF） analysis. The first three EOF modes show the obvious seasonal variations of SSH in the SCS. EOF mode one is generally characterized by a basin-wide circulation. Mode two describes the double-cell basin scale circulation structure. The two cells were located off west of the Luzon Island and southeast of Vietnam, respectively. EOF mode three presents the mesoscale eddy structure in the western SCS, which develops into a strong cyclonic eddy rapidly from July to September. EOF mode one and mode three are also embedded with interannual signals, indicating that the SCS surface circulation variation is influenced by El Nino events prominently. The strong El Nino of 1997/98 obviously changed the SCS circulation structure. This study also shows that there existed a series of mesoscale eddies in the western SCS, and their temporal variation indicates intra-seasonal and interannual signals.     

中国西南地区岩溶水资源的特点及可持续利用对策

岩溶水资源是西南岩溶地区社会经济发展的一个最为重要的支撑点．西南岩溶地区降水丰富，岩溶水资源总量大，但由于强烈的岩溶作用和岩溶植被的破坏，西南岩溶地区成为我国严重缺水的地区之一，水资源问题成为制约该地区经济发展的关键因素．充分认识西南岩溶地区水资源的赋存特点和时空演变规律，认清目前岩溶水资源开发利用中存在的问题及原因，有利于今后西南岩溶地区水资源的合理开发和保护，对实现西南岩溶地区脱贫和社会经济的可持续发展具有重要意义．从地质背景和人类活动胁迫两方面分析了岩溶含水层的特点以及目前西南岩溶地区水资源开发利用中存在的突出问题，提出了西南岩溶区水资源的可持续利用的对策．     

宁夏吴忠市利通区隐性城镇化研究

通过对宁夏昊忠市利通区隐性城镇化的特点、形成机理和功效利弊的分析，提出了将隐性城镇化转为显性城镇化的几点举措，即创新政策体制．加快利通区小城镇的建设，促进农村经济增长和农民增收以及形成有效合理的农村剩余劳动力的转移机制，旨在提升利通区的城市化水平，以带动整个区域的跨越式发展．     

区域中心城市区位选择的模型研究--以嘉兴市为例

借鉴图论的有关做法,结合威尔逊空间相互作用模型,构建区域中心城市区位选择的模型,从而试图定量分析封闭和开放两种条件下区域中心城市的适宜区位.从模型中可以看出,在封闭条件下区域中心城市适宜区位趋于区域的地理中心,而在开放条件下区域中心城市适宜区位趋于主导联系方向.作者选取浙江省嘉兴市对模型进行实证分析,分别考察了封闭和开放两种条件下嘉兴区域中心城市适宜区位的变化趋势.     

长白山植物区系研究

长白山植物区系具有以下特征：1）植物种类比较丰富，共计维管植物105科、336属、610种．2）优势现象比较明显．3）本地区属典型的温带分布，地理成分较复杂．4）种的特有现象明显．5）该区系具有古老性．     

2005年世界女排大冠军杯赛中国女排得分情况浅析

通过对2005年世界女排大冠军杯赛中国女子排球队5场比赛得分技术统计进行分析,探讨中国女子排球队在扣球、拦网、发球等得分方面与其他各队相比较的优势和差距。分析结果得出:中国队在主要得分环节上的扣球得分能力低于世界强队巴西队与美国队,但高于其它参赛队;拦网得分与发球得分的成功率较一般参赛队高;在因对方失误得分方面,中国队失误送分较多。     

可持续旅游开发与地域发展

旅游开发作为开发行为之一,依据其开发规模对旅游地产生了各种各样的影响.基于可持续发展的最新研究成果,对可持续旅游开发与地域发展的相互协调的关系进行了简单分析.为了实现可持续旅游开发,在社会和文化方面,必须要与地域产业、地域自然环境和地域共同体的三个侧面进行相互联系,使旅游开发不单成为获得经济效益的手段,也要成为地域建设的推动力,从而确立可持续旅游开发在建设富裕的、易于地方居民居住的旅游地域的综合核心的地位.     

《华南理工大学学报（自然科学版）》2000～2006年载文、作者和引文分析

应用文献计量学的方法，对2005年全年12期和2000～2006年的每年第1期，共计18期《华南理工大学学报（自然科学版）》进行定量分析，并与相关的文献报道进行比较．结果表明：该刊载文量较高，基金项目论文占70．9％；论文合著率为94．1％，合作度3．17；第一作者中具有高级职称的占38．9％，博士后、博士和博士研究生占61．8％，年龄30岁以下的占28．8％，31～40岁的占44．1％；篇均引文8．23条，英文引文占59．9％，期刊类引文占65．3％，引文质量上乘．     

县级区域教育政策存在的问题与建议

县级区域教育政策是指县级教育行政部门依据国家教育政策并结合当地实际所制定的教育政策,县级区域教育政策在制定与执行中存在系列问题,要解决这些问题,必须完善区域教育系统、整合原有的组织机构、加大培训力度,提高教育行政机关的政策水平。