登录

双语推荐：Ree

进入期刊文章
选择印度尼西亚苏拉威西岛Kolonodale地区和中国云南省元江地区的2个超基性岩红土风化壳为研究对象,对比研究不同气候环境下超基性岩在红土风化过程中REE的地球化学特征及其演化机制.研究发现,印尼Kolonodale和中国元江剖面的REE分布型式具有一定的共性规律,都表现出显著的REE表生富集效应(相对于基岩的最大富集系数分别达44.21和236.19)、不均一的轻重稀土分异(分异程度随剖面深度加大而降低)以及剧烈的Ce异常正负转换现象(风化壳上部是正Ce异常,风化壳下部是负Ce异常).2个剖面中REE最大富集段的产出位置明显错位,表现在Kolonodale剖面中REE最大富集段出现在腐岩层,而在元江剖面中REE最大富集段出现在红土层.质量平衡计算指示,REE在超基性岩红土化过程中发生了显著的迁移和分异现象,其地球化学行为受红土剖面pH值环境与有机质(O.M.)含量的制约.案例对比分析表明,气候环境对超基性岩红土化过程中REE的地球化学演化具有重要影响.在热带雨林环境的印尼Kolonodale剖面中,风化壳中REE主要继承于基岩,在高强度的红土化作用下,REE经历了强烈的重新分配和垂向分异.而在亚热带季风气候环境的中国元江剖面中,风化壳中的REE具有更复杂的物源背景,除继承基岩外还可能叠加了风尘沉积物的影响.元江剖面的红土化程度偏弱,导致REE在表生演化中未发生强烈的淋滤和次生富集作用.
To understand the characteristics and evolution of REE during the process of the ultramafic laterization under different climate conditions,two outcrops Kolonodale in Indonesia and Yuanjiang in China are chosen for comparision.It is found that the contents of REE from the laterite crusts are higher than those from the bed rocks in both places (enrichment factor being 44.21 and 236.19 respec-tively).The indices of differentiation between the LREE and HREE decrease with profile downward toward,and the indice of Ce anom-aly shows a shift from the positive Ce anomaly in the upper segment to negative Ce anomaly in the lower part.The difference between the two profiles lies in the distribution of the highest REE enriched segment.The laterite layer represent the most REE enriched for the Yuanjiang,whereas the saprolite layer for the Kolonodale.The evaluation of the mass balance shows remarkable migration and differen-tiation of REE in the ultramafic laterization process,which were constrained

[ 可能符合您检索需要的词汇 ]

进入期刊文章
从冀东南地区系统采集了地表水（n=37）、地下水（n=31）、水系沉积物（n=81）、土壤（n=242）和岩石（n=472）的稀土样品,利用统计学和岩性岀露加权方法分别对14个稳定的稀土元素（REE）含量及各类稀土基准值和分布模式方面进行了研究。对岩石—土壤—水系沉积物—地下水和地表水系统中稀土元素迁移和分布模式的研究表明,随土壤的发育,REE出现富集,并出现分异,HREE比LREE更易在土壤中富集;Eu在岩石和土壤中由负异常到地下水和地表水的正异常演化特征。地表水和地下水中REE的含量和分布模式相近。
Rare earth samples were systematically collected from surface water (n=37), groundwater (n=31), stream sediments (n=81), soil (n=242) and rocks (n=472) in southeastern Hebei province. In order to study the content of 14 kinds of rare earth ele-ments (REE) based on their reference values and the distribution pattern of REE, the authors employed statistical analysis and the method of lithologic exposure weighting. Based on the migration of the elements and the pattern of the rock-soil-stream sediments-groundwater and surface water, the authors hold that, with the evolution of soil, REE are concentrated in soil and the HREE are more obviously concentrated than the LREE;Eu seems to change from negative anomaly in rocks and soil to positive anomaly in groundwater and surface water. Groundwater and surface water have similar content and distribution patterns of REE.

[ 可能符合您检索需要的词汇 ]

进入期刊文章
采用ICP-MS,XRF等分析测试手段,对花沟西勘查区24件煤样和8件岩浆岩样品中稀土元素(REE)的含量进行测定与分析,并通过对8号煤层和10号煤层中稀土元素丰度的研究,探讨了淮北花沟西勘查区煤中稀土元素的含量特征和岩浆侵入对煤中稀土元素分布的影响。研究表明:花沟西勘查区煤中ΣREE平均值为92.09×10-6,LREE/HREE平均值为6.54~8.53;岩浆侵入致使煤中稀土元素含量增加,使煤中稀土元素发生了二次迁移与富集,且岩浆组分对煤中稀土元素的迁移富集具有一定程度的影响
In order to investigate the abundance and distribution pattern of rare earth elements (REE) in coals at Western Huagou exploration area when coal seams were intruded by magma, ICP-MS, XRF were used to analyze in 24 coal samples and 8 magmatic rock samples. The REE’s data in the No.8 and No.10 coal-beds were compared in order to find the features of REE in coals which altered. Main conclusions are as followlng:(1) The average content of REE in coals at Western Huagou exploration area is 92.09×10-6. The value of LRRR/HREE is between 6.54 and 8.53. (2) The abundance of REE in coals was changed caused by the igneous invasion, and the intrusion lead to a second migration and enrichment of the REE. And this process will be influenced by the components of magma.

[ 可能符合您检索需要的词汇 ]

进入期刊文章
Rare earth elements(REEs) were reported to have adverse biology effects on plant growth and production. However, whether REEs are involved in plant hormone abscisic acid signal is not clear. Here we reported that REE lanthanum(La) interacted with abscisic acid(ABA) in the regulation of seed germination and root growth in model plant Arabidopsis. La3+at a concentration of 10 μmol/L alleviated ABA depression of seed germination and reversed ABA inhibition of root elongation growth in Arabidopsis. Previous studies showed that ABA could promote root hair development. In the present study, La3+inhibited root hair development promoted by ABA. Moreover, La3+inhibited H2 O2 generation induced by ABA in root cells. Therefore we inferred that La3+might interact with ABA upstream of H2 O2 generation.
Rare earth elements (REEs) were reported to have adverse biology effects on plant growth and production. However, whether REEs are involved in plant hormone abscisic acid signal is not clear. Here we reported that REE lanthanum (La) interacted with abscisic acid (ABA) in the regulation of seed germination and root growth in model plant Arabidopsis. La3+at a concentration of 10 μmol/L alleviated ABA depression of seed germination and reversed ABA inhibition of root elongation growth in Arabidopsis. Previous studies showed that ABA could promote root hair development. In the present study, La3+inhibited root hair development promoted by ABA. Moreover, La3+inhibited H2O2 generation induced by ABA in root cells. Therefore we inferred that La3+might interact with ABA upstream of H2O2 generation.

[ 可能符合您检索需要的词汇 ]

进入期刊文章
皖南蓝田剖面皮园村组为一套埃迪卡拉纪?寒武纪过渡期(约550～532 Ma)沉积的黑色硅岩.皮园村组硅岩样品的w(Ce)/w(Ce*)为0.68～1.08(平均0.85)， w(LaN)/w(CeN)为0.56～1.52(平均1.10)，指示它们可能形成于大陆边缘环境.剖面下部与剖面上部样品具有明显不同的稀土配分：剖面下部样品的P REE低，具有与现代海水非常相似的稀土配分，表明受陆源碎屑物质影响很小.虽然剖面上部样品依然保留了海水的某些特征，如Ce的负异常和Y的正异常，但总体显示出平坦的REE配分形态，且P REE高，接近平均页岩，表明剖面上部样品受陆源碎屑影响大. w(Al2O3)也表现出下部样品低(0.03%～0.94%，平均0.41%)、上部样品高(0.74%～5.04%，平均2.98%)的特征.这些地球化学特征表明：皖南皮园村组硅岩很可能沉积于大陆边缘环境，其沉积水体由于海退的影响逐渐变浅，由深水盆地边缘环境转变为斜坡环境.硅岩沉积古地理环境的变化可能造成水体氧化还原环境的变化，从而对早期生命的出现、演化和分布产生影响.
The black Piyuancun chert in Southern Anhui Province was deposited in terminal ediacaran to early cambrian transition period (about 550–532 Ma). The w(Ce)/w(Ce*) and w(LaN)/w(CeN) of the Piyuancun chert samples were 0.68–1.08 (avg. 0.85) and 0.56–1.52 (avg. 1.10), respectively, which indicates that the chert was deposited in the continental margin. Chert samples from the lower part and the upper part of the Lantian section have different rare earth elements (REE) patterns: REE concentrations for chert samples in the lower section are low relative to post-Archean Australian shale (PAAS), and their REE patterns are similar to that of the modern seawater, indicating that the influence of terrigenous detrital has been trivial. Although REE patterns for the chert samples in the upper section maintain some seawater characteristics, such as negative Ce anomaly and positive Y anomaly, they have flat REE patterns that are similar to PAAS, and their REE concentrations are close to t

[ 可能符合您检索需要的词汇 ]

进入期刊文章
小秦岭金矿产于新太古界太华群变质岩中,其中的次级拆离断裂为赋矿构造。为了探究矿床的地球化学特征和矿床成因,从矿区主要地质体采集了100件来自太华群地层、文峪岩浆岩和矿石的样品进行测试,其稀土元素的主要特征为：太华岩群的ΣREE值为30.81×10^-6-188.66×10^-6;δEu值为0.62-1.24;花岗岩和脉岩类ΣREE值为58.22×10^-6-365.98×10^-6;δEu为0.90-1.10;矿石的ΣREE值多集中于76.74×10^-6-358.22×10^-6,δEu值多集中于0.74-1.14。结果表明：各地质体稀土总量接近,没有Eu异常或有微弱的正、负铕异常;矿石的稀土元素含量特征与太华群接近,而与文峪等花岗岩相差较远。分析认为,成矿物质主要来源于太华群地层而不是花岗岩。
The Xiaoqinling gold deposits are located in the Neoproterozoic Taihua Group,of which the seconda-ry detachment faults are the major ore bearing structure.In order to figure out geochemical characteristics and genesis of ore deposit,we collected 100 samples from the Taihua Group ,magmatic rocks and gold ores of main geological body in the study area,respectively.The main characteristics of rare earth elements are as following:the ΣREEs of Taihua Group are from 30.81 ×10 -6 to 188.66 ×10 -6 ,and the δEu values are from 0.62 to 1.24;ΣREEs of granite and dike rocks are from 58.22 ×10 -6 to 365.98 ×10 -6 ,and the δEu values are from 0.90 to 1.10;ΣREE of gold ores are mainly concentrated in 76.74 ×10 -6 -358.22 ×10 -6 ,δEu values are mainly concentrated in 0.74 -1.14.The results show that the ΣREE from the three kinds of geologic body are similar,and there is no Eu anomaly or there are only weakly positive and negative europium anomaly.The rare earth distribution of o

[ 可能符合您检索需要的词汇 ]

进入期刊文章
建立有限长圆柱滚子的非牛顿流体热弹流润滑模型,选取Ree-Eyring流体和Power-Law流体进行有限长线接触弹流润滑分析。研究表明:随着接触线长度增大,端部效应减弱;Ree-Eyring流体特征剪切力对润滑温升和剪切力影响较大,而对润滑压力与膜厚影响甚微;Power-Law流体随指数增大,润滑膜厚明显降低;随载荷、转速升高,热解与等温润滑结果差异增大,热效应对摩擦因数的影响尤其显著。
A thermal elastohydrodynamic lubrication (TEHL)finite line contact model was proposed for a cylindrical roller with Ree-Eyring fluid and Power-Law fluid.The results show that with the increase of contact line length,end effect is decreased.The Eyring shear stress for Ree-Eyring fluid has a great influence on the temperature rise and shear stress, while has a little influence on the pressure and film thickness.For Power-Law fluid,the film thickness is decreased dramat-ically with the increase of Power-Law exponent.Compared with the isothermal results,the thermal results are quite different with the increase of load and speed,and there is a more significant influence on friction coefficient for thermal effects.

[ 可能符合您检索需要的词汇 ]

进入期刊文章
通过对鸭绿江河口外海域CH01柱状样沉积物进行稀土元素(REE)地球化学分析,结合粒度参数研究,分析了其稀土元素地球化学特征,并与周边河流进行了对比,揭示了它的物质来源。结果显示:CH01柱状样沉积物以砂为主,稀土元素平均含量与全球沉积物稀土元素平均含量相当。经过球粒陨石标准化,发现其为典型的陆源沉积。CH01的主要稀土元素参数与长江、黄河及朝鲜半岛上的河流差异明显,与鸭绿江沉积物的分异特征最接近,说明研究区物质来源主要是鸭绿江径流输运的陆源碎屑物质。
The core sediment CH01 was collected from the Yalu River Estuary. Subsequently, these samples were analyzed for rare earth element (REE) compositions and grain size parameters. The purposes of this paper are: to study the distributions of REE compositions in the core sediments; to compare the REE compositions between the sediments from Yalu River estuary and surrounding rivers; and to discuss their implications for sediment sources of this study area. The results indicated that, the sand was the main composition of core sediment CH01, and the average REE content in the core sediments was similar with the global average content. In addition, the sediments from the study area inclined to be typically terrigenous under Chondrite-normalized REE patterns. Furthermore, the REE differentiation characteristic parameters of the core sediment were significantly distinct from those of Yangtze River, Yellow River of China, and the rivers on the Korean Peninsula, and closer to that of Yalu River se

[ 可能符合您检索需要的词汇 ]

进入期刊文章
野外观察中扬子京山地区逆冲推覆带和冲断褶皱带内奥陶系、二叠系和三叠系发育多期沿裂缝分布的方解石脉。通过稀土元素(REE),电子探针,氧同位素,流体包裹体分析及盆地模拟对方解石脉成因进行了研究。奥陶系和三叠系方解石脉REE呈现轻稀土元素(LREE)富集,重稀土元素(HREE)亏损,明显的正铕(Eu)异常,说明成脉流体受到了热液流体的影响;二叠系方解石脉REE总量低,LREE低度富集,HREE配分曲线平坦,中等程度负铈(Ce)异常,显示成脉流体为大气淡水成因。根据电子探针Fe,Mn元素分析,部分奥陶系方解石脉成因与其围岩碳酸盐溶解有关;二叠系方解石脉成因主要与大气淡水淋滤碳酸盐成分有关,三叠系方解石脉成因与其他层位海相碳酸盐成分有关。利用氧同位素温度和流体包裹体均一温度,结合研究区虚拟井的埋藏史和热史模拟结果,推测3套地层裂缝方解石脉体形成深度约在2 000~2 500 m,形成时间约为距今150~60 Ma。综合方解石脉地球化学特征分析认为,燕山期构造挤压抬升作用伴随的热液流体、成岩流体及地表水下渗作用使京山地区油气保存条件遭受了一定程度的破坏。
Field observation shows that multiple phases of calcite veins occur along fractures in the Ordovician ,Permian and Triassic of overthrust belts and fold-thrust belts in Jingshan region ,Mid-Yangtze.Using rare earth elements(REE), electron microprobe ,oxygen isotope ,fluid inclusions and basin modeling ,this paper analyzed the genesis of these calcite veins.The REE of calcite veins in the Ordovician and Triassic are characterized by enrichment of LREE ,loss of HREE and obvious positive Eu anomaly , indicating that their vein-froming fluids were affected by hydrothermal fluids .Calcite veins in the Permian feature in low REE ,only slight enrichment of LREE ,flat HREE patterns,and the presence of a mod-erate negative Ce anomaly ,implying that their vein-froming fluids originated from meteoric water infiltration .Analysis of Fe and Mn through electron microprobe indicates that some calcite veins in the Ordovician were derived from the dissolu -tion of surrounding carbonate rocks ,the calci

[ 可能符合您检索需要的词汇 ]

进入期刊文章
主要定义了RP-framed富足半群。给出了富足半群S是RP-framed等价于S同构于Rees雷斯矩阵半群M(T;I,Λ;P),其中T是富足幺半群,矩阵P的元都是T的单位群。
RP-framed abundant semigroup was defined.We proved that a semigroup was a RP-framed abun-dant semigroup if and only if it was isomorphic to some Rees matrix semigroupM(T;I,Λ;P),where T de-noted an abundant monoid.The entries of the matrix P lied in the group of units of T.

[ 可能符合您检索需要的词汇 ]