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    pH is generally less than 6.5. Thewhole groundwater system is in the oxidation environment.
    地下水中 pH 值一般小于 6.5,呈偏酸性甚至弱酸性,并且处于氧化环境中。
    It is found that in the kaolinites formed in the acid-reduction environment Fe exists mainly in the form of Fe2+ replacing Al3+ and ferrous-oxide and in those formed in the oxidation environment, Fe exists mainly in the form of Fe3+ replacing Al3+ and ferric-oxide.
    结果表明,在酸性还原条件下形成的高岭石中,铁主要以Fe2+的形式置换结构中的Al3+,同时也有部分铁以亚铁化合物形式存在;
    The content of soluble Fe ̄(3+) and Fe ̄(2+) in sediment is one of the most important indi-cators reflecting the reduction-oxidation environment. The ratio of Fe ̄(3+) /Fe ̄(2+) in marinesediment has been applied to marine geology and geochemical exploration for oil andgas.
    沉积物可溶性Fe ̄(3+)、Fe ̄(2+)含量变化,是反映氧化还原环境的重要指标之一,海洋沉积物Fe ̄(3+)/Fe ̄(2+)比值已被应用于海洋地质及油气化探上。
    The exampleanalysis suggests that  ̄(234)U/ ̄(238)U ratio is 7.1  ̄(234)U/ ̄(230)Th ratio is 560 in the groundwater atNevada test site U.S.A,and this aquifer system is in stronger oxidation environment,U,Th,Ra,Pb and Po radionuclides are highly retarded,their retardation factors are range form 10 ̄2~10 ̄5 and distribution coefficients are 4.7~2630 ml/g.
    实例分析表明,美国内华达州试验场地下水中 ̄(234)U/ ̄(238)U=7.1, ̄(234)U/ ̄(230)Th=560,显示出含水系统处于强氧化环境; U,Th,Ra,Pb和Po放射性核素强烈地受到吸附阻滞,其阻滞系数为10 ̄2-10 ̄5,分配系数为4.7~2630ml/g。
    In turn, during the postglacial period, the CaCO_3 and Al_2O_3 contents became higher, and the ratios of Na to Al , Mg to Al and Na to K decreased, which reflected that the sedimentary environment became an open oxidation environment, the climate became humid and hot with a stronger condition of chemical weathering.
    冰后期褐铁矿出现高含量,钠与铝、镁与铝和钠与钾的比值均降低,Al2O3和CaCO3含量增高,反映沉积环境渐变为开放的氧化环境,气候转变为化学风化作用较强的湿热气候;
    The results are as follows:(1) Groundwater in Dongwu Banner is dominated by HCO_3-Na type,and it is manly phreatic water under the oxidation environment;
    结果表明:①东乌旗地区地下水类型有HCO3-Na型,主要为氧化环境的潜水;
    Factor F1 indicates the oxidation environment and is correlated with the terrigenous material,factor F2 indicates the weak oxidation environment,and factor F3 indicates the weak reduction environment. The wavelength ranges of principal factors F1,F2 and F3 are 405 to 445 nm and 495 to 595 nm,605 to 695 nm and 445 to 485 nm,respectively.
    主因子F1指示氧化环境,并与陆源物质相关,F2指示弱氧化环境,F3指示弱还原环境,主因子的波长范围分别是405~445 nm和495~595 nm,605~695 nm,445~485 nm。
    Based on the high temperature and short-term oxidation environments,2D Cf/SiC-Si composites were prepared by precursor infiltration and pyrolysis.
    针对短时高温抗氧化的具体环境,采用先驱体转化工艺制备2D Cf/SiC-Si复合材料。
    Mudstones in the MSC9 lacustrine facies, formed in a weak oxidation environment, are of high organic matter with total organic carbons ranging from 1% to 10% and average of 3.5%, average vitrinite reflectance 0.65% and I -Ilkerogen types, which indicate that the organic mater in the mudstones is in its low mature to mature stage and resulted in good source rocks.
    MSC8(长2段)和MSC9(长1段)又可分为七个短期旋回(SSC1、SSC2……SSC7)。
    The uranium ion is easily washed away with flowing water at oxidation environment, deposited at the reduction environment. In the nature,the uranium mine is usually enriched in the oxidation-reduction transition zone.
    铀离子在氧化环境易流失,在还原环境易沉淀,自然界中铀矿富集在氧化-还原过度带。
    Then by compare among these technical routes and programs, the author believes that in the oxidation environment, the use of catalytic methods removing both NO_x and PM is a better method.
    然后通过对这些技术路线和这些方案的比较,作者认为在氧化环境中,用催化方法同时去除NO_X和PM是较好的方法。
    It isconcluded that they occurred in oxidation environment, more detrital materials, longdistance transport and deposited in high-energy environment.
    可以看出其生成条件是氧化环境,陆源输入多,搬运距离近,沉积在高能环境里。
    The mechanical performance test gave a proof that the coating adherence to the substrate was conformed to the operating requirement and fit for the actual high temperature oxidation environment.
    通过力学性能试验证明了涂层结合强度较好,符合工况要求,适用于高温氧化实际环境。
    was mobilized and released, but the released uranium can not be preciPitated bemuse of the oxidation environment, and it can be diffused during diagenetic dehydration and then precipitated in nearby grey beds with low Eh together with uranium-bearing "stagnant water" fixed in pores, forming economic uranium concentration.
    由于该层为氧化环境,释放出来的铀不能沉淀,只能和原来储存在孔隙间的含铀“囚水”一起,在成岩脱水过程中扩散到与其紧相邻的Eh值低的灰色还原层位中沉淀,形成铀的工业富集。
    Hematites are often in parage- nesis with pitchblende,but they are products of different stageS in hydrother- mal eVo1Ution process. Hematite occurred in the OXidation environment with high fugacity Of oxygen. while pitchblende occurred in the reduction envi- ronment with IOW fugacity of oxygern.
    赤铁矿常与沥青铀矿共生,但它们是热液演化过程中不同阶段的产物,赤铁矿形成于体系氧逸度高的氧化环境,沥青铀矿形成于体系氧逸度低的还原环境,赤铁矿形成于沥青铀矿之前。
 

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