Exotic ion H 3 ++ in strong magnetic fields

1. The exotic system H ₃ ⁺⁺ (which does not exist without magnetic field) exists in strong magnetic fields:
   1. In triangular configuration for B≈10⁸–10¹¹?G (under specific external conditions)
   2. In linear configuration for B>10¹⁰?G
2. In the linear configuration the positive z-parity states 1σ _g , 1π _u , 1δ _g are bound states
3. In the linear configuration the negative z-parity states 1σ _u , 1π _g , 1δ _u are repulsive states
4. The H ₃ ⁺⁺ molecular ion is the most bound one-electron system made from protons at B>3×10¹³?G

Possible application: The H ₃ ⁺⁺ molecular ion may appear as a component of a neutron star atmosphere under a strong surface magnetic field B=10¹²–10¹³?G.     

陕西省泾惠渠灌区土壤重金属地质累积指数评价

通过对陕西省泾惠渠灌区现场调查及土壤样品的采集,分析了灌区土壤中Hg、Cd、Cr、Pb、As、Cu、Zn等7种元素的含量,应用地质累积指数对灌区土壤进行了评价。结果表明：从区域分布看,阎良区、临潼区、高陵县所属采样点污染较严重;Hg污染最严重,地质累积指数为1.007～3.117,58%的采样点级别为3级,属中度污染到强污染,38%的采样点级别为2级,属中度污染;Zn污染程度次之,地质累积指数为-0.407～1.644,71%的采样点级别为1级,属无污染到中污染;Cd污染变异程度最大,地质累积指数为-2.705～3.312,70%的采样点级别0级,属无污染,但个别采样点达到了强污染;Cu的地质累积指数为-0.535～0.421,Pb为-1.119～-0.144,Cr为-1.005～-0.458,As为-0.562～0.077,除个别点外这些重金属污染级别皆为0级,属无污染。     

三峡蓄水后典型河段分形维数的变化分析

针对三峡工程蓄水后下游河道河床表面形态的变化,采用分形维数对河床表面形态进行量化,并分析河道冲淤调整特点,对河床表面分形维数(BSD)的变化特点及物理意义进行探讨。结果表明,BSD与河床各个剖面形态之间的关系是整体与部分的关系,BSD能全面地反映床面形态的复杂程度。三峡蓄水后,宜昌-虎牙滩和宜都河段BSD明显增大,关洲河段增大幅度较小,而芦家河河段BSD值略有减小,同时,各河段BSD的变化可在一定程度上表征三峡蓄水后下游河道河床综合阻力的调整结果。可通过对各河段演变趋势的分析,来预测其BSD的变化,进而为分析其阻力和水位的变化趋势提供依据。     

基于时序MODIS NDVI的黑河流域土地覆盖分类研究

归一化植被指数(NDVI)是植被生长状态及植被覆盖度的最佳指示因子,其时序数据也已成为基于生物气候特征开展大区域植被和土地覆盖分类的基本手段。基于时序NDVI数据的土地覆盖分类,即通过提取NDVI时间信号所包含的植被生物学参数,构建起一个包含植被生物学信息的分类特征空间。利用2006年重建得到的MODIS NDVI 16天合成时间序列数据,并结合1 km分辨率的DEM数据、野外实地调查资料等辅助数据,综合分析了不同土地覆盖类型对应的时序NDVI谱线及其第一、二谐波的特征阈值,建立决策树对黑河流域的土地覆盖开展分类研究。结果表明,基于时序MODIS NDVI谱线特征的决策树分类精度为78%,Kappa系数为0.74。利用1 km时序MODIS NDVI时间序列获得较为准确的黑河流域土地覆盖类型是可行的。     

基于物元分析方法的水源地水质分析

介绍了物元分析的基本原理及计算步骤,并在此基础上,对沈阳浑河附近郎家水源地地下水质进行水质等级的评价。在评价结果中可以看出,此种评价方法,引入了关联函数和权重系数等因素,使得评价结果与实际情况更加吻合。能够更好的反映出当地地下水的水质情况。     

某储油库地下水有机污染健康风险评价

本文以USEPA推荐使用的污染场地健康风险评价方法为基础, 结合污染场地实际情况, 分析、评价了某储油库地下水有机污染对场址内暴露人群造成的健康风险。评价结果表明: 该储油库地下水有机污染物为1,2-二氯乙烷、苯、三氯甲烷和甲苯。污染场址内的工人和居民受到的非致癌风险均小于1, 在可接受范围; 而污染对场址内的工人和居民产生的致癌风险较大, 分别为1.7×10?4、9.0×10?3, 是不可接受的。产生致癌风险的主要污染物为1, 2-二氯乙烷, 占总致癌风险的99.80%, 可致人产生多种形态的肿瘤, 并具有潜在的遗传毒性。主要暴露途径是吸入吸收, 占总致癌风险比例大于70%, 其次为口入吸收。皮肤接触暴露途径产生的致癌风险较小, 占总致癌风险比例小于1%。     

Influence of Particle Morphology on the Hydraulic Behavior of Coal Ash and Sand

Flexible-wall hydraulic conductivity tests were carried out on bottom ash, fly ash and compacted specimens of sand with additions of 0, 3, 6, 9 and 18% of bentonite. In order to study the effect of bentonite inclusion and particle morphology on the hydraulic conductivity of the admixtures, an investigation was undertaken based on thin section micrographs. It was found that, for both bottom and fly ash admixtures, bentonite addition reduced only one order of magnitude the hydraulic conductivity, from 1.78 × 10⁻⁶ m/s to 1.39 × 10⁻⁷ m/s. On the other hand, the sand hydraulic conductivity was reduced five orders of magnitude, from 3.17 × 10⁻⁵ m/s to 5.15 × 10⁻¹⁰ m/s. Among several factors that can be responsible for the difficulty in reducing hydraulic conductivity, such as ash grain size distribution and elevated cation concentration (leached from the ash) in pore water, it can also be recalled the high particle voids observed in the ash by means of microscopic analysis. The same is not true with the sand, which has solid particles, without inner voids.     

四川盆地中二叠统栖霞组层序——岩相古地理

随着对四川盆地碳酸盐岩储集层的重视和大力勘探,中二叠统栖霞组发育的滩相储集层成为盆地内寻找新气源的有利层位之一。文中根据岩心观察、野外剖面实测和室内镜下岩石薄片鉴定分析,并结合各种沉积相标志研究,确定研究区栖霞组主要发育浅水型碳酸盐岩台地沉积,其可进一步划分为碳酸盐岩台地相及若干亚相和微相。以Vail的层序地层学理论为指导,通过以岩性—岩相转换界面为主的层序界面识别,确定栖霞组发育2个Ⅱ型三级层序,每个层序划分出TST和HST两个沉积体系域。在沉积相和层序地层学分析的基础上,以层序格架内体系域为编图单元,用"单因素分析多因素综合作图法"编制了各体系域的岩相古地理图并对其演化特征进行了分析。结合各相带储集物性特征,认为台缘滩和台内滩为最有利储集相带,尤以SQ2-HST滩相颗粒灰岩经过白云岩化改造后更具储集意义。     

内蒙古赤峰市鸭鸡山钼铜矿成矿流体特征及矿床成因

鸭鸡山钼铜矿床所处大地构造位置为蒙古—鄂霍次克造山带的温都尔庙—翁牛特旗褶皱带,该带是我国重要的有色金属成矿带之一。鸭鸡山钼铜矿床分布受控于区域EW向深断裂,矿体产于EW向主断裂F1上盘的二长花岗岩体中,严格受东西向F1断裂和北东向断裂控制。该矿床矿石自然类型为石英脉型和蚀变岩型,矿石中硫化物主要有黄铁矿、辉钼矿和黄铜矿。石英流体包裹体有气液两相、含子矿物三相和纯气相3种类型。流体盐度(w(NaCl))为2.06%～44.00%,集中在40%～44%和4%～8%;流体密度为0.85～1.25 g/cm3,集中在1.20～1.24 g/cm3和0.88～0.92 g/cm3;成矿温度为167～380℃,集中在320～360℃和200～220℃;流体盐度、密度、成矿温度在直方图上均表现为双峰特征。研究表明:成矿早阶段流体为高盐度、高密度和高温的岩浆流体,气相包裹体与含子晶三相包裹体共存,表明该阶段发生过强烈的沸腾或不混溶;成矿晚阶段为低盐度、低密度和中温的混合流体。通过等容线图解法估算成矿压力为274.7～368.5 MPa,用静岩压力梯度估算成矿深度为8.32～11.2 km。矿床成因类型为中成、中高温热液脉型...     

Construction of deep tunnel shafts in Mexico city soft clays by the flotation method

The drainage system of Mexico City, one of the largest metropolitan areas in the world, is formed by a large network of interceptors and collectors leading to the main outlet: a 49.3-km-long tunnel with a 6.5 m diameter. To build the access shafts to the tunnels of the system and the deep sumps of the pumping stations in the very soft clays of the lacustrine area of Mexico valley, a technique known as “flotation method” has been commonly used since 1969. The paper presents the main construction steps followed and some aspects of the analysis and design of shafts constructed by this technique. The experience gained obtained after more than 30 shafts have been constructed by this method, and the actual trends in its application are also discussed.