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|  | | 为了更好的帮助您理解掌握查询词或其译词在地道英语中的实际用法,我们为您准备了出自英文原文的大量英语例句,供您参考。 | |
In fact, it is difficult for the plant to transport metals to its top.
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Clearly, the efficiency with which bubbles can transport metals depends on the frequency with which bubbles are produced by the AGN.
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| | Through convecdon,hydrothermal system derived from magmatic fluids causes the diffusionof large proportion ofheat from the depth of the earth to the surface. At the same time,these flu-ids transport metals,forming a very important class of ore deposit ,namely hydrothermal deposits. Porphyry copper and molybdenum deposits,for example ,provide more than half of these metalsfor the world.Magmatic fluids serve as the major source for many components in hydrothermaldeposits. These components co... | | 岩浆在其放气作用过程中能向地表释放出大量的金属元素,如Cu、Mo、Au,如果存在适当的富集机制,从岩浆熔体中释放出来的成矿元素在一定的地质环境中聚集并沉淀就能够形成工业矿体。岩浆液态不混溶作用是导致分散于岩浆熔体中的成矿元素有效富集并最终形成工业矿体的重要机制。在封闭体系中,随岩浆结晶作用的进行,挥发性组分会在残余岩浆中不断聚集并最终析出而形成岩浆热液。F和B因易与Si、Al、Na、K等造岩元素结合而倾向于固定在熔体结构中,并在结晶作用发生时进入矿物晶格中,因此不易从岩浆熔体中析出而进入流体中。蚀变与矿化是两个独立的地质作用,尽管矿化与蚀变相伴生,但成矿作用的发生与否与蚀变作用没有本质上的联系。 | | 文摘来源 | | The most thermodynamic and electrostatic properties of water vary anomaly and diverge to ±∞with increasing temperature and pressure in the critical region. These properties control to a lafge degree the transport and chemical processes in the hydrothermal systems and cause fluid and convective heat fluxes and most standard partial molal properties of aqueous solutes to asymptotically approach ±∞ at the H2O critical point. Supercritical aqueous fluids are very different from electrolytic solution at am... | | 水的许多性质在其临界区域随温度、压力的升高有着异常的变化行为,这种行为不仅控制着热液体系中的质量和热量输运过程,使得流体和对流热通量以及水溶液溶质的大多数标准偏摩尔性质在水的临界点附近接近正的或负的无穷大,而且也影响着体系中的化学过程。超临界水溶液流体与室温下的电解质溶液在许多方面有很大的差别,这些差别对水如何溶解矿物及迁移金属和配合物具有深刻的影响。 | | 文摘来源 | | It has been estimated that more than 20 million hectares of farmland have been contaminated in China,accounting for 20% of the total in the country.Furthermore,a reduction of more than 10 million tons of food supplies results from this soil contamination.Techniques currently employed control soil contamination include cover with improted soil,application of lime and chemical washing.However,most of these are expensive,labour intensive and can result in further contamination problems or leaching/deposition ... | | 植物修复技术 ( Phytoremediation)是近年来发展起来的一种主要用于清除土壤重金属污染的绿色生态技术。重金属超富集植物 ( hyperaccumulator)及植物修复技术是当前学术界研究的热点领域 ,目前虽已有 Cd、Co、Cr、Cu、Mn、Ni、Pb、Zn等超富集植物发现的报道 ,但尚无一例报道来自于中国。中国具有广袤的国土面积、丰富的植物类型和多种 (处 )古老的矿山开采与冶炼场所 ,在中国开展超富集植物的寻找、研究与开发工作 ,将会有重要突破 ,并具有重要的理论与实践意义。本文拟就国内外在这一领域的研究进展作一简要综述 | | 文摘来源 | |   | | << 更多相关文摘 |
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