改性煤系高岭土矿粉填充橡胶的结构与性能   总被引：4，自引：0，他引：4  

赵鸣  李书同  何素芹  朱诚身 《矿物学报》2006,26(1):113-117

以煤系高岭土为主要原料通过相对富集,超细粉碎、表面改性处理等方法,得到一种橡胶填充剂MUCKP。用它代替通用炭黑作为橡胶的补充填充剂,制备了胶片,对填充后的橡胶进行了应用性能研究。结果表明:用于天然橡胶时,当填充剂粒度小于400目时,已有较好的补强作用,其主要性能指标类似于通用炭黑,可以部分等量替换碳黑作为橡胶的补强填充剂。取代量在20%~25%之间。  相似文献   

沸石对放射性核素Cs+,Sr2+的吸附阻滞作用   总被引：7，自引：0，他引：7  

李虎杰  易发成 《矿物岩石》2006,26(1):5-8

通过对新疆乌鲁木齐浅水河地区沸石的物化性质和工程特性(包括阳离子交换容量、孔结构、粒度组成、击实密度、渗透系数等)、活化处理以及对放射性核素C s ,S r2 吸附性能的研究,结果表明:该沸石的阳离子交换容量(CEC)达到97.9 m eq/100 g,在中性条件下最高为195.4 m eq/100 g;击实后的渗透系数为8.7×10-4m/s。沸石对溶液中的C s ,S r2 吸附量分别达到162.6×1-0 3和74.9×1-0 3,吸附效果优于内蒙高庙子膨润土矿。经过钠改性和铵改性处理后的沸石,对C s 的吸附量有不同程度的提高,最高达234.5×1-0 3;但对S r2 的吸附效果影响不大。溶液pH值对C s ,S r2 的吸附量有明显影响,中性和碱性环境更有利于沸石吸附作用的进行。  相似文献   

导水裂隙带高度研究方法概述   总被引：23，自引：0，他引：23  

王双美 《水文地质工程地质》2006,33(5):126-128

导水裂隙带高度的确定是水下采煤工作之重点，目前并没有一个完全可以精确确定的方法，主要的研究方法有经验公式法、物理模拟、数值模拟和现场实测。单靠其中的一种也不能确定，将几种方法相互结合则是准确得到导水裂隙带高度计算方法的重要途径。  相似文献   

荒漠地区生物土壤结皮的水文物理特征分析   总被引：15，自引：0，他引：15       下载免费PDF全文

王新平  肖洪浪  张景光  李新荣  康尔泗 《水科学进展》2006,17(5):592-598

通过室内压力陶土板系统测定土壤含水率与基质势的关系与Star-1土壤水分物理特征测定系统确定非饱和土壤水力传导度的方法,结合应用van Genuchten公式模拟,分析了位于腾格里沙漠东南缘包兰铁路沙坡头段人工生态防护体系生物土壤结皮的水文物理特征,确定了其水分特征曲线、非饱和土壤水力传导度、非饱和弥散系数,并与原始沙丘沙进行比较。结果表明,生物土壤结皮的持水能力是沙丘沙的3~9倍。当土壤基质势在-1~-3 000 cm的较高范围变化时,生物土壤结皮平均非饱和水力传导度低于沙丘沙(约为12%);而当土壤基质势在-3 000~-15 000 cm的较低范围变化时,沙丘沙的平均非饱和水力传导度又大大低于生物土壤结皮(约为91.0%)。正是由于生物土壤结皮特殊的质地与结构,使其非饱和水力传导度随着土壤基质势的降低,以及土壤含水量的减少,而趋于增大。与原始沙丘沙比较,生物土壤结皮独特的水文物理特点决定了它对荒漠地区土壤微生境的改善与促进作用,特别是通常情况下的高持水能力与低土壤基质势条件下的较高非饱和水力传导度,能够提高浅层土壤水分的有效性,有利于人工生态防护体系主要组分浅根系灌木、草本植物与小型土壤动物的生存繁衍。  相似文献   

Nonlinear mixed effect modelling for improved estimation of water retention and infiltration parameters     

T.C. Omuto  B. Minasny  A.B. McBratney  E.K. Biamah 《Journal of Hydrology》2006,330(3-4):748-758

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The relationship between length and width of plutons within the crustal-scale Cobequid Shear Zone, northern Appalachians, Canada     

Ioannis K. Koukouvelas  Georgia Pe-Piper  David J. W. Piper 《International Journal of Earth Sciences》2006,95(6):963-976

The lengths and widths have been measured for 69 component bodies of composite plutons along the Cobequid Shear Zone. Plutons on major fault strands, those with mylonite zones >0.1 km wide, exhibit evidence of multiple intrusion of magma batches. Small plutons along short faults in stepover zones appear related to rapid emplacement of magma in bodies 1.5–4 km long by 0.1–2 km wide. Such small plutons show low enrichment in incompatible elements in older component bodies, but increasing amounts in younger bodies as a result of progressive magma expulsion from crystal mush during crystallization and shear-enhanced compaction in fault zones. Wider plutons generally occur along longer fault strands accommodating more strain and penetrating deeper into the crust and show enrichment in incompatible elements. The width of the mylonitic fault zone is about 15% of the width of these plutons. The length-to-width ratio of component bodies and composite plutons varies between 2 and 11. The best-fit line describing these data has a slope of 1.056, which implies scaling behavior between plutonism and tectonic processes. Scalar properties of plutonic bodies are similar to those of faults, but scalar relationships observed in component bodies do not apply to composite plutons.  相似文献   

Engineering properties of Hınıs ignimbrites and their usability as a building stone (Erzurum, Turkey)     

Fevzi Öner  Sedat Türkmen  Ahmet Özbek  Tuncay Karakaya 《Environmental Geology》2006,50(2):275-284

The survival of several ancient monuments made of ignimbrites in Hınıs town (Erzurum-Anatolia), which has suffered from intense annual temperature fluctuations and strong seismic activity, can mainly be attributed to use of suitable building stones. This paper examines the usability as building stones of Middle Miocene Hınıs ignimbrites that widely outcrop in and around Hınıs town. The petrographical, geochemical, mechanical, and physical properties determined lead to categorization of the ignimbrites as four different types. The Hınıs ignimbrites contain dasite–trachy–andesite and rhyolite. Rhyolite is the strongest material whereas the other types, being more porous, are weaker, lighter, and have good heat-insulation properties. Being light (easily transportable, machinable, and workable), good heat insulators, environmentally friendly (because of natural ventilation), sufficiently elastic to sustain seismic loading in the area under study, and more cost-effective than artificial stones, Hınıs ignimbrites are certainly a preferable option for use as light building stone. These ignimbrites are not suitable for use as floor covering, however, (because of rapid abrasion) or for building structural columns (because of low strength).  相似文献   

桂西两次强降雨过程对比分析   总被引：12，自引：0，他引：12  

曾小团  农孟松岑瀚 邓海光 《广西气象》2006,27(3):18-21

对2005年8月20日和2006年6月13日发生在桂西的两次强降雨并伴有强对流天气过程的影响系统、物理量场和FY-2C红外云图及雷达回波特征进行对比分析。结果表明：造成桂西两次强降雨都是在充足的水汽条件和强烈的上升运动条件下发生的；主要影响系统来自低层切变线、高空低槽和地面静止锋；强降雨过程发生在强烈的不稳定层结区域和K指数高值区。  相似文献   

Multi-functional heat pulse probe measurements of coupled vadose zone flow and transport     

Annette P. Mortensen  Jan W. Hopmans  Yasushi Mori  Jirka Šimůnek 《Advances in water resources》2006

Simultaneous measurement of coupled water, heat, and solute transport in unsaturated porous media is made possible with the multi-functional heat pulse probe (MFHPP). The probe combines a heat pulse technique for estimating soil heat properties, water flux, and water content with a Wenner array measurement of bulk soil electrical conductivity (EC_bulk). To evaluate the MFHPP, we conducted controlled steady-state flow experiments in a sand column for a wide range of water saturations, flow velocities, and solute concentrations. Flow and transport processes were monitored continuously using the MFHPP. Experimental data were analyzed by inverse modeling of simultaneous water, heat, and solute transport using an adapted HYDRUS-2D model. Various optimization scenarios yielded simultaneous estimation of thermal, solute, and hydraulic parameters and variables, including thermal conductivity, volumetric water content, water flux, and thermal and solute dispersivities. We conclude that the MFHPP holds great promise as an excellent instrument for the continuous monitoring and characterization of the vadose zone.  相似文献   

楼板谱研究述评   总被引：2，自引：0，他引：2  

李宏男  国巍 《世界地震工程》2006,22(2):7-13

介绍了楼板谱方法的发展与研究现状。详细阐述了主附结构系统的相互作用、调谐、非经典阻尼、多点支撑等动力特性问题,分别介绍了传统楼板谱与新型楼板谱以及多维地震动下楼板谱的研究方法,给出了有待进一步研究的课题。  相似文献