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1991—1995年中国人发微量元素分析现状 总被引:5,自引:0,他引:5
对1991-1995年人发(未包括台湾省资料)的分析进展作了评述。内容涉及测试方法、分离富集方法、采样及预处理等。共引用文献267篇。 相似文献
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对近20年来化学发光分析法测定锰的进展作了评述,内容包括发光体系、操作条件、检出限及线性范围、离子干扰与消除以及实际应用。引用文献24篇。 相似文献
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近年来,我国地质样中痕量稀土发射光谱分析有了较大进展,成为稀土分析化学中最活跃的领域之一。这里,作者仅就手头掌握的部分文献,对此进展作一评述。 相似文献
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《中国地理文摘》(英文版)是报导中国地理学文献的检索性期刊(季刊),经过两年试办积累经验,并报中宣部批准,于1987年向国内外公开发行。 出版《中国地理文摘》(英文版),为了及时、准确、全面地向国外报道我国的地理科学的研究成果和进展,以扩大我国地理学研究在世界上的影响,加强与世界各国的学术交流。该刊的选题范围包括整个地理学体系及相关学科的重要文献。其文献类型包括研究报 相似文献
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对学科领域代表性刊物的文献计量分析可以为了解学科领域进展、历程与发展趋势提供重要信息。《沉积学报》是我国沉积学相关领域的代表性学术刊物,通过文献计量学手段,对1983-2018年该刊所发表的相关学术成果展开文献计量分析,尤其是近10年来《沉积学报》报道成果的文献学特征,进而探讨我国沉积学领域的研究热点与发表趋势。分析认为,引入国际研究热点,加强目前国内热点的量化研究、机理研究、过程研究、数值研究、系统研究,鼓励方法创新、数据共享、学科交叉,展开更多基础研究,将有助于我国沉积学研究的快速、健康发展。 相似文献
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《地质找矿论丛》1988,(3)
AbstraCtsACtaAdvaflCeS inAgeAnnaleSAnnUal reviewAnnual rePortsArChiveSBibliegraPhyBulletinChronologyChronieleCommunieationsCoUrantCoUtietCurtefltDigestExPressGuardianHeraldIfldexGaZetteJournalLetterMagazineMailMemoirSMirrorNeWSNewsletterNotCPOStPreSS文摘;摘要学报进展时代纪事;年表年评年报文献集;档案书志,题录通报,公报年代学;年表纪事(报)快报;通讯报纸J决报;信使报近期;当前辑要;文献快报;快件前卫(报)先驱(报)索引报;公报杂志;会志信件;函件;快报杂志;期刊邮报研究报告;纪要;会志镜(报)新… 相似文献
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《Geomechanics and Geoengineering》2013,8(4):223-236
The use of vertical drains with vacuum preloading for soft soil improvement has become a booming interest in recent years. In this paper, theoretical and practical developments of the utilization of vertical drain with vacuum preloading are currently reviewed. Geotechnical aspects of factors affecting the performance of vacuum consolidation and conversion procedure for multi-drain analysis are discussed based on the current state of the art. The salient aspects of selected case histories on soft clays and land reclamations are elucidated. 相似文献
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Josef DEMPIR 《Geostandards and Geoanalytical Research》1986,10(1):87-91
For evaluating the analytical data on reference samples, the following approach is proposed: 1. Analytical methods used are critically reviewed. 2. Outliers are eliminated. 3. Normality of the results is tested. 4. If normality of the results can be accepted, arithmetic mean, its confidence interval and coefficient of the precision are computed. 5. If the results are not normally distributed, median and its statistical characteristics are given. 6. For sets of data with anomalous skewness, logarithmic and lambda transformations are useful approaches. 相似文献
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《Quaternary Science Reviews》1999,18(8-9):1061-1073
Important palynological sequences are reviewed from caves with archaeological interest in Mediterranean Spain. Upper Pleistocene sites include Abric Romanı́ and Abric de l’Arbreda in NE Spain, and in SE Spain Cueva de la Carihuela, Cova Beneito, Cueva de Perneras, Cueva del Algarrobo and the Holocene Cova de l’Or and Cova de les Cendres. Carihuela has the longest sequence, starting in the last interglacial and covering most of the last glaciation. A pre-Würm phase was followed by two glacial maxima separated by an interpleniglacial phase, and in the Lateglacial the Younger Dryas seems present. Whereas at Carihuela harsh pleniglacial conditions caused Mediterranean associations to disappear, in the milder surroundings of Beneito and Perneras these were able to survive. At Romanı́, pollen shows acute palaeoclimatic sensitivity, pointing to upland refuges nearby. Holocene pollen from Cova de l’Or and Cendres underlines the importance of pine in natural woodlands of mature meso and thermomediterranean taxa. Some between-site comparisons and contrasts with modern bioclimatology are interpreted in the context of the palaeoclimate history. Despite taphonomical and methodological problems of cave palynology, its future in arid regions such as SE Spain is promising. 相似文献
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Sedimentary records are potential to provide long-term evidence for better understanding the development mechanism of coastal hypoxia, shedding some light on the forecast, prediction and controlling-measure development to mitigate hypoxia. Therefore, recent research advances in the formation mechanism and evolution history of coastal hypoxia were briefly reviewed, specially with focus on sedimentary records and proxy methods. First, marine environments with hypoxia were classified into semi-enclosed marginal sea/gulf and open shelf sea based on the degree of bottom-water circulation and ventilation, and main characteristics for the hypoxic development were discussed respectively. Secondly, the methodology was reviewed in the efficiency by using different proxies to reconstruct hypoxia development history from sediment cores, including redox indicators of sedimentology, biology, mineralogy and geochemistry. Ultimately, recent research advance in hypoxic development mechanism and evolution history off the Changjiang Estuary were summarized. It is worth noting that long-term evolution history has been less studied from long cores. It is therefore suggested that a synthetic methodology involving multi-core comparison with different-proxy interpretation should be employed to study the development history of seasonal hypoxia off the Changjiang Estuary. 相似文献
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对于Biot固结方程中的连续性方程形式,不同的研究者存在分歧。在详细分析了Biot推导固结方程的过程后,发现其在推导固结方程时用到的弹性应变能密度函数存在错误。为了得到正确的连续性方程,采用两种思路进行了分析:①通过对土体单元变形的分析,得到了考虑土体颗粒和流体可压缩性的连续性方程;②按照Biot推导固结方程的思路,通过修正推导过程中用到的弹性应变能密度函数得到了连续性方程。上述两种思路得到的连续性方程是等价的,同时将上述连续性方程和其他研究者通过质量守恒得到的连续方程进行了对比,结果是一致的,从而确定了连续性方程的正确形式,并澄清了目前在Biot固结方程中的连续性方程上存在的分歧,所得结论可为固结方程的解析或数值计算提供依据。 相似文献
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我国与寻找超大型矿床有关的基础研究进展 总被引:8,自引:0,他引:8
我国于1992年将超大型矿床基础性研究列入国家基础研究重大项目,已取得如下成果:确定了超大型矿床的定义和分类原则,发现了超大型矿床在矿化类型上的选择性和局限性,我国超大型矿床主要分布于克拉通边缘,铅同位素的地球化学急变带,地壳厚度急变带,碳酸岩系向碎屑岩系过渡带是超大型矿床产出的有利宏观背景;立足于寻找超大型矿床,提出了6个新的成矿域;确定了我国东部喜山期和南方晋宁期对金属成矿的重要意义。此外,还对邻国超大型矿床成矿带和成矿类型向我国延伸的可能性以及超大型矿床与矿床密集区时空展布及成因上的复杂性进行了研究,提出了独立银矿床及成矿带概念,对我国当前开展的超大型矿床基础研究作了概要介绍,简要评述了当今国际上超大型矿床研究趋势。 相似文献
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人体高发疾病的病理性矿物研究进展 总被引:3,自引:0,他引:3
人体很多疾病病灶中都有矿物晶体沉淀,这些矿物与通过地球化学作用生成的矿物在成分、结构和产状上有很大差异。病理性矿物的矿化过程必然有人体有机组织和成分的参与,并影响着疾病的发生和发展。因此含有丰富的能反映人体环境及周围环境变化影响人体的信息,这些信息具体蕴藏在矿物外部微形貌、内部微结构、化学组成和成因、产状等方面。本文总结了一些高发疾病如肿瘤、心血管疾病、关节炎、中枢神经系统疾病中病理性矿物的分布和特征,综述了矿物与疾病关系的部分研究成果。 相似文献
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东营凹陷南坡东段的潜山勘探程度很低,复杂的残留地层结构及其发育模式认识不清严重制约着潜山的精细勘探。综合应用野外标准岩石地层对比、古生物群落时代划分及不整合测井综合分层等技术,重新厘定研究区的深部层系地层归属与划分方案。在此基础上,应用构造演化恢复技术搞清多期构造运动对地层剥蚀、残留的控制作用,最终明确残留地层平面的展布特征。研究表明,研究区中生界残留地层仅分布在王古2井区以北地区,南部草桥-王家岗南部广大地区则为上古生界地层;由于研究区遭受印支运动挤压成山、燕山运动拉张裂陷等多幕构造运动影响,残留地层表现为近北西向“跷跷板”状的地层产状模式。该成果可为东营凹陷的复杂潜山油气藏勘探提供理论指导。 相似文献