Geochemical characterization of loess-paleosol sequences: Comparison between the upper reaches of the Hanjiang and Weihe river valleys,China

This paper aims to compare the geochemical characteristics of loess-paleosol sequences in the upper reaches of the Hanjiang and Weihe river valleyswhich are located in the semi-humid temperate zone and humid subtropical zonerespectively. The Mituosi(MTS) profile in the upper reaches of the Hanjiang River valley and the Yaohecun(YHC) profile in the Weihe River valley were selected for this comparative research. The stratigraphic characteristicscompositionchemical weathering intensityleaching rates of Ca and Namobility of major elementsand transport features of Na and Fe were analyzed with respect to depth and compared between the two profiles. This study reached the following conclusions.(1) The composition of the loess-paleosol sequences in two regions are quite similar to the average composition of the upper continental crust(UCC)indicating that the loess in the two regions came from multiple sources and was mixed well. Thereforethe loess in the two regions is considered aeolian loess.(2) Compared with the loess-paleosol sequence in the Weihe River valleythe loess-paleosol sequence in the upper reaches of the Hanjiang River valley features a darker color; a higher chemical index of alteration(CIA) value; higher leaching rates of Na and Ca; higher migration ratio(relative to K) of AlSiMgand Na; and lower migration ratio of Fe and Ca. This evidence indicates that the loess-paleosol sequence in the humid subtropical environment experienced stronger chemical weathering intensity than the loess-paleosol sequence in the semi-humid temperate zone.(3) Both the YHC profile and MTS profile record a period of climate deterioration at 6000–5000 a BP. The period punctuated the mid-Holocene Climatic Optimum(8500–3100 a BP) in the study area.     

沪宁高速公路无锡段春季浓雾的实时监测和若干特征

20 0 0年 2月到 4月沪宁高速公路 ,共监测到 7次低能见度 (<2 0 0m)的春雾。本文应用环境气象监测仪AMW自动气象站 ,每分钟实测的有关资料和相应的环流背景场 ,对 7次春雾形成的物理过程作了研究分析。揭示了春雾形成过程中的若干特征和设计了实施临近预报制作的思路、流程。并论述了在高速公路沿线布设AMW自动气象监测仪的基础上作出低能见度的预测是可行和可能的     

狭缝系统与伊利石结晶度Kuebler指数的测定及相关问题讨论

根据实验结果,衍射峰半高宽随接收狭缝增大而呈二次工线线性增大。扫描速度与扫描步长的确定应遵守Ｗａｎｇ（１９９４）提出的关系式,并确定在相对误差小于〈５％的范围内。固定样品条件,选定最优实验条件下使用国际标样标定系统偏差是伊利石结晶测量中必不可少的重要步骤。不固定样品条件和实验条件,同一样品的伊利石工值将因条件的变化而不同;固定样品和实验条件而不使用国际标样标定系统偏差,则无法与他人数据进行对比,其     

气象要素对太阳能电池板温度的影响

温度升高会引起光伏电池发电效率下降,电池板温度是确定温度折减系数的必要条件,目前我国尚没有充足的外场实测电池板温度数据。该文基于北京南郊太阳能试验站2010年全年逐时电池板温度、气温、地表温度、斜面和水平辐照度实测数据,分析了电池板温度随时间的变化及其与各气象要素的关系。结果表明:电池板温度与气温和斜面辐照度的综合相关或与地表温度的线性相关最好,但实测数据不易获得;电池板温度与气温的线性相关较好,数据较易获得且质量有保证,从现实可行性考虑,是推算电池板温度最实用的相关方程;电池板温度与气温和水平辐照度的综合相关可以作为辅助方程,用于推算气温较高情况下的电池板温度。基于2010年电池板温度实测数据和加权计算的方法,得到北京地区年平均光伏发电温度折减系数约为2%,最高可达到13.3%。     

基于GIS的供电台区经营综合评价

探讨了运用GIS技术对供电台区经营综合评价的实现方法,选取了业务属性和空间属性两个方面评价因子,介绍了从系统软硬件、评价实现过程及显示结果等方面评价过程的具体技术实现。     

飞机积冰过程的诊断分析及强度预报建模

利用NCEP再分析数据和观测数据,对2000年6月6日甘肃省人工增雨作业时的一次飞机积冰过程进行诊断分析,利用WRF模式对72个飞机积冰实例的天气过程进行了数值模拟,在此基础上结合飞机飞行速度建立了积冰强度预报模型,通过统计分析和拟合得到预报模型的参数,并利用飞机实测报告对该模型的预报效果进行了回报检验。结果表明,该模型对飞机积冰强度的预报准确率为69.44%,强度预报结果偏弱占比25%,偏强占比5.56%。     

武汉市供电局110联动报修计算机管理系统

介绍了武汉市供电局110联动报修计算机管理系统的设计和实现方法。系统利用ATM网络和PSTN网络,在SQLServer数据库环境中实现配电故障的信息处理。     

Magnetic detection method for seabed cable in marine engineering surveying

The detection and identification of the seabed cable is becoming an important task in the marine engineering. The features of the magnetic anomaly can be used to detect the existence of the seabed cable. The magnetic field model is presented, and the consistency of the magnetic anomaly distribution between the simulation of the model and the observed data is verified. The comparison shows that the seabed cable can be effectively detected and identified with reasonable method.     

青藏高原近地面层微气象学特征

利用1998年5月-7月在改则、当雄和昌都三测站获得的近地面层气象要素变化的观测资料，分析了青藏高原近地面层风速、温度和湿度日变化特征及廓线规律，发现高原近地面层微气象学特征具有自己的特点；同时还讨论了高原近地面层白天出现的逆湿现象。     

基于DPSIR模型的河西走廊农田防护林健康评价

农田防护林健康对维护绿洲生态安全、减少风沙灾害、改善局地小气候、提高农作物产量等具有重要的意义。综合运用熵值法和层次分析法确定指标权重,基于驱动力-压力-状态-影响-响应（DPSIR）模型对河西走廊农田防护林健康状况进行了评价。结果表明：（1）河西走廊农田防护林整体上处于亚健康水平,瓜州县、酒泉市肃州区、嘉峪关市和临泽县的农田防护林处于健康水平,民勤、民乐、高台和阿克塞的农田防护林处于不健康水平,其余区县农田防护林处于亚健康状态。（2）林带连续性、疏透度、修枝情况和地区经济收入是驱动区域农田防护林健康状况的关键因素。