地核物态及其量子地球动力探讨   总被引：2，自引：0，他引：2  

陈志耕 《物探与化探》2002,26(4):273-278

根据量子力学原理对核物质状态进行分析，简要计算了现代地球内核超固态物质原子中被公有公电子的平均值、地核物质的公有化自由电子浓度、现代地球内核中自由电子平均运动速度、早期产生地核物质量子效应的自引力压强临界值和起动地球整体膨胀的自引力压强、地核发生超固态量子力学效应所需要的能量等参数。内地核物质很可能是在超高压环境下形成的一种特殊物质状态-超固态。地核超固态产生的量子排斥压强超过地球自引力收缩压强的临界值时，导致地球发生整体的膨胀，由此引出量子地球构造动力的概念。  相似文献   

A New Power-Law Relation For The Vertical Distribution of Suspended Matter     

Richard Bintanja 《Boundary-Layer Meteorology》2002,104(2):305-317

Generally, the vertical distribution of suspendedmatter is described by a simplepower-law relation in which it is assumed that thefriction velocity is constant withheight. This is a simplification of the actual mechanismof turbulent transport, sinceturbulence will most likely be reduced in the presenceof suspended particles for avariety of reasons. Here we investigate analytically,by assuming a constant shearstress with height, how the increased density of thetwo-phase mixture reduces thefriction velocity. This reduces the upward turbulentflux of particles, which tends todecrease the drift density compared to a situation inwhich changes in friction velocityare neglected. A new power-law relation is derived,which in snowdrift predicts amaximum reduction in drift density of 25% (and 40%for Martian dust) over thestandard power-law relation. In other geophysicaltwo-phase flows, such as suspendedmatter in water, the effects are shown to be negligiblebecause of the small ratio of driftdensity and medium density. Generally, this and otherinteractions between the particlesand the flow should be taken into account to betterunderstand the vertical profile ofsuspended matter in geophysical two-phase flows.  相似文献   

Geology and characterisation of the Pecket coal deposit, Magellan Region, Chile     

E. Hidalgo  S. Helle  G. Alfaro  U. Kelm 《International Journal of Coal Geology》2002,48(3-4)

The geology, petrography and chemical variation of the Pecket coal sequence, Magellan Region (52°57′S, 71°10′W), the only Chilean coal used for electricity generation on a large scale, has been studied in order to predict their combustion behaviour, especially in coal blends. The depositional environment of formation of the coal seams was a swamp rarely exposed to subaerial conditions and was associated with the development of the folded foreland of the Magellan basin during the Tertiary (Oligo–Miocene). The general tectonic regime of the collision of the Antarctic and South American plates is reflected by a system of joints with 40°N–50°W strike. The maceral composition of all six seams studied indicates high contents of vitrinite (>90%), minor content of liptinite (4.7%) and inertinite (<2%). Occurrence of tonstein horizons altered to kaolinite indicates a distal volcanism during peat accumulation. Coal rank varies between lignite and subbituminous (Ro=0.28–0.42%) with an average dry basis calorific value of 5450 kcal/kg, 17 wt.% moisture, 41 wt.% volatile matter, and sulphur content below 0.5 wt.%. The mineral matter (LTA) associated with the coal shows a dominance of kaolinite with quartz, smectite, and minor basanite. SiO₂/Al₂O₃ and Fe₂O₃/CaO ratios of the ashes diminish towards the lower seams. With respect to the utilisation of Pecket coals in combustion, base/acid ratios (B/A) and silica ratios (SR) indicate potential fouling for seams 1, 2, 5, and 6i, with high fouling indexes (Rf) for seams 2 and 5. Pecket coal is excellent for blend combustion due to its low sulphur content.  相似文献   

华南亚热带山地土壤有机质更新特征定量研究   总被引：12，自引：3，他引：12  

陈庆强  孙彦敏  沈承德  彭少麟  易惟熙  姜漫涛  李志安 《地理科学》2002,22(2):196-201

选择鼎湖山自然保护区森林植被带（SL）、灌丛一草甸过渡带土壤剖面（GC）进行薄层取样，根据土壤有机质^14C放射性水平，运用模型计算土壤有机质更新速率（m）。结果表明上部0－10cm土层有机质更新速率（m）最高；向下,m锐减；剖面下部m值极低，这说明土壤有机质由不同更新周期（T）组分构成。表层快循环组分占绝对优势，向下，慢循环组分为主，剖面下部为稳定组分。根据m、有机碳含量、有机碳含量、土壤容重、土层厚度计算有机质更新CO2产量，表层0－10cm层段CO2产量约为整个剖面的98％。SL剖面m值及有机质更新CO2产量均明显大于GC剖面相应值。分析表明在同一气候植被是制约土壤有机质更新及CO2产量的第一要素，这为通过绿化加强土壤碳汇功能提供重要依据。  相似文献   

湿地土壤有机质和全氮含量分布特征对比研究——以向海与科尔沁自然保护区为例   总被引：17，自引：6，他引：17  

白军红  邓伟  朱颜明  翟金良  张玉霞 《地理科学》2002,22(2):232-237

研究了土壤有机质及全氮在霍林河中下游的科尔沁和向海两个自然保护区湿地表层土壤中的水平分布及其在土壤剖面中的垂直分布特征。结果表明，与科尔沁自然保护区相比，向海自然保护区的空间分异程度较高，其表层对有机质及全氮的持留作用较强，碳的固定速率比氮累积更慢一些；盐碱化程度较高，湿地植被净化效应较显著；pH值对有机质和全氮的影响也更为显著。  相似文献   

Magnetic properties and Mössbauer spectra of urban atmospheric particulate matter: a case study from Munich, Germany     

A. R. Muxworthy  E. Schmidbauer  N. Petersen 《Geophysical Journal International》2002,150(2):558-570

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贵阳市红枫湖水体悬浮物中重金属污染及潜在生态风险评价   总被引：7，自引：1，他引：6  

梁莉莉  王中良  宋柳霆 《矿物岩石地球化学通报》2008,27(2)

研究了红枫湖水体中悬浮物重金属（Zn、Cu、Cr、Pb和Cd）的季节性和空间性污染特征,采用Hakanson潜在生态危害指数法评价了水体悬浮物中重金属的潜在生态危害。结果表明,重金属随着季节和空间变化都较大;产生潜在生态危害的重金属主要是Cd和Pb,分别达强度生态危害水平和中度生态危害水平,Cu、Zn和Cr显示轻度危害水平;潜在生态危害综合指数RI=226．09,说明重金属污染已达到中度生态危害。红枫湖悬浮物重金属潜在生态危害指数的季节性变化顺序为二月〉六月〉四月〉十二月〉十月〉八月,空间变化顺序为化肥厂河〉麦包河〉猫跳河〉桃化源河〉后六河〉羊昌河〉北湖〉麻线河〉南湖。  相似文献   

Alpine metamorphism of organic matter in metasedimentary rocks from Mt. Medvednica (Croatia)     

Katalin Judik  Gerd Rantitsch  Thomas M. Rainer  Péter Árkai  Bruno Tomljenović 《Swiss Journal of Geoscience》2008,101(3):605-616

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浅水湖泊水体中不同颗粒悬浮物静沉降规律研究   总被引：4，自引：0，他引：4       下载免费PDF全文

向军  逄勇  李一平  魏海  王鹏  刘兴平 《水科学进展》2008,19(1):111-115

为了解浅水湖泊水体中颗粒悬浮物的静沉降规律,以太湖为例,采用重复深度吸管法计算了2005年4月、5月间在太湖进行的4次静沉降模拟实验中的沉降速度。结果表明:①在悬浮物沉降过程内,3种颗粒物的沉速关系为颗粒无机物(PIM)>悬浮物(SS)>颗粒有机物(POM)。在相同的沉降时间内,PIM的沉速为SS沉速的1.6~2.0倍,POM的沉速为SS沉速的0.3~0.7倍,PIM的沉速为POM沉速的2.5~5.5倍;②水体中悬浮物浓度与沉降时间均呈现出明显的指数衰减规律,悬浮物中无机物含量较高时这种规律更为明显;③悬浮物浓度较低时,太湖悬浮物的沉降速率与水体中的悬浮物浓度无明显的相关关系;而悬浮物浓度较高时,沉降速率随悬浮物浓度升高而增大。  相似文献   

成都市城东区浓雾时大气颗粒物的总数密度及质量变化特征   总被引：1，自引：0，他引：1  

韩才义  许模  李海华  李晓东 《地质灾害与环境保护》2008,19(4):39-42

利用自动型尘埃颗粒激光计数器和Anderson采样器,对成都市城东区两次浓雾天前后颗粒物的总数密度和质量分别进行了分析,得到颗粒物的物理变化特征,结果表明,浓雾的存在可以改变颗粒物的物理特征：颗粒物总数密度保持在270000～310000／100cm。之间,粒径0．3～0．5μm颗粒物数密度降低,粒径在0．5～3μm之间的粗颗粒物数密度升高;质量主要集中在粒径0．65～2．1μm的积聚模态颗粒物上。  相似文献