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小城镇开发区土地集约利用评价研究 ——-以浙江省慈溪市为例

以浙江省慈溪市小城镇开发区、工业区块土地利用的自身特点和现状数据为基础,建立土地集约利用评价 指标体系,采用综合评价法,选择评价模型并确定指标的权重,根据评价标准计算出慈溪市小城镇开发区、工业区 块土地集约利用程度。评价结果表明,慈溪市小城镇开发区、工业区块仅1 处属于II 级土地利用较集约,其余均属 于III 级土地利用基本集约和IV 级土地利用不集约;进一步分析表明,不同级别开发区土地投入强度、利用程度和 持续状况差异显著,不同产业类型开发区土地利用效率差异较显著。由此可见,政策因素对小城镇开发区土地集约 利用的影响起基础性作用。     

中国大陆GPS连续观测站基线时间序列分析

本文根据中国地壳运动观测网络基准站1999年初至2010年9月底的资料, 对中国大陆90条GPS基线时间序列进行了分析, 讨论了这些基线在正常情况下的趋势性运动特征, 总结了2001年昆仑山口西和2008年汶川两次8级大震前GPS基线时间序列的异常变化, 并在此基础上分析了GPS基线近期变化情况。     

电离层高阶项延迟对GPS载波相位观测值及基线的影响

为研究电离层高阶项延迟及其影响,采用IGS提供的实测数据与产品,结合具体实验讨论地磁模型、TEC数据模式、GPS频率及测站分布等对电离层高阶项延迟的影响,分析不同TEC获取方式与地磁模型处理模式下的电离层高阶项延迟对基线的影响.实验表明,利用不同方式获取的TEC是影响电离层高阶项延迟的关键因素,其对载波相位观测值的影响...     

Experimental Study on the Electrical Conductivity of Orthopyroxene atHigh Temperature and High Pressure under Different Oxygen Fugacities

1 Introduction recognized and accepted by more and more experts engaged in experimental research at high temperature and In-situ laboratory measurement of the electricity of high pressure. This method has been regardedgeological materials at high temperature and high pressure internationally as the most advanced one for the in-situis an important approach to revealing the composition, laboratory measurement of the electric properties ofstructure and properties of materials in the deep interior…     

海潮负荷对GPS基线的影响

利用由卫星测高数据反演获得的NAO99海潮模型（23个潮波）计算了海潮变化对上海、乌鲁木齐、北京和广州台站GPS定位的影响,研究了海潮负荷对由这些台站组成的4条GPS基线的影响。结果表明海潮负荷对单点定位的影响在沿海地区达到厘米量级。对内陆台站的影响小于1cm;而对基线的影响均小于1cm,并与基线方位角和台站负荷影响大小密切相关,其相对影响在10^-4～10^-9量级,这在高精度的GPS基线尤其短基线测量中是必须考虑的。     

大叶藻海草床的生态恢复: 根茎棉线绑石移植法及其效果

于2009年和2010年在青岛汇泉湾用根茎棉线绑石法进行大叶藻(Zostera marina L.)移植, 并于2012年4月20日至11月19日对移植大叶藻的生长情况进行观察(包括形态学变化、密度、茎枝高度、地上生物量、底质粒径几个方面)。观察期间水温为7.8～26.1℃。结果显示, 移植底质可定性为粉砂质;移植大叶藻的有性繁殖期为2012年4～8月; 无性繁殖在秋季达到高峰; 密度在6月和9月分别高达411茎枝/m²和481茎枝/m²; 高度与地上生物量的最大值出现在6～7 份。与2009年青岛湾天然大叶藻进行比较后可以发现, 移植大叶藻的高度、地上生物量及其季节变化与天然大叶藻基本保持一致,说明移植大叶藻的生长状况良好, 同时说明根茎棉线绑石法是一种高效且实用的海草床生态恢复方法。     

小肠梗阻MSCT研究现状

小肠梗阻具有很高的发病率,早期准确诊断和全面病情评估是临床选择治疗方式的前提。多层螺旋CT (MSCT)在评价是否存在小肠梗阻、梗阻部位、严重程度及梗阻病因方面均具有很高的准确度,对继发性肠缺血也能提供有价值的影像学信息。本文对MSCT在小肠梗阻评价中的应用现状进行综述。      

Factors affecting rill erosion of unpaved loess roads in China

This study explores factors that affect road surface erosion in a small watershed on the Loess Plateau. Global positioning system (GPS)‐assisted field surveys and geographical information system methods were applied. The results show that road surface rills in the watershed are more easily formed on main roads, which are disturbed by intensive human activities. Secondary unpaved road networks occupied the largest road surface area and contributed 49% of the total road surface rill volumes. Spatial analysis reveals that roads near residential areas or leading to other human‐disturbed land‐use types are at high risk of soil loss. In each road segment, slope gradient, road segment length and drainage area have impacts on surface rill formation and development. Among these factors, slope gradients have been verified as a controlling factor of rill erosion intensification. Both road segment length (R = 0.83, N = 82) and drainage area (R = 0.72 for road segment and 0.76 for upslope drainage areas, N = 82) significantly influence total road surface rill volumes. The interaction variable of road segment length multiplied by slope is more closely correlated with road segment soil loss than that of the independent variables alone. Linear equations composed of slope gradient, road segment length and upslope drainage area are proposed. The new equation performs much better at predicting surface soil loss from secondary road segments compared with the previous models, which have not considered upslope drainage areas. The relationships and equations from this study will be helpful for road erosion evaluation in a small watershed of the study area. Copyright © 2014 John Wiley & Sons, Ltd.     

Z指数方法在小流域洪涝灾害预警技术研究中的应用

Z指数方法在洪涝统计方法中得到广泛应用,考虑小流域洪涝灾害的时空特点,采用任意连续10天法计算的洪涝Z指数更科学,更能反映实际。通过对流域内单站洪涝指数的确定,并与常规月洪涝Z指数的对比,新方法能较好弥补常规方法的缺陷,较好描述洪涝灾害的强度和起止时间,由其计算而得的流域综合洪涝指数,对历史洪涝个例有较高拟合度。