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1.
人体泌尿系统结石及人发成分分析的意义 总被引：1，自引：0，他引：1
利用红外光谱分析法对尿路结石进行了物相分析,并用原子吸收分光光度法测定了结石和发样的微量元素,根据结石的物相特征、微量元素含量以及与人体发样微量元素含量进行对比分析,探讨了尿路结石的成因、影响因素及预防措施。 相似文献
2.
催化动力学光度法测定痕量铜的研究 总被引：1，自引：1，他引：1
周之荣 《华东地质学院学报》1996,19(4):427-430
本研究了硫酸介质中用邻菲罗啉作为活化剂，铜（Ⅱ）催化过氧化氢氧化酸性溶液蓝Ｋ的褪色反应，建立测定发痕量铜（Ⅱ）的新型动力学光度法，检出限为１．５×１０＾－８ｇＣｕ（Ⅱ）／Ｍｌ，测定范围为０～３．０μｇＣｕ（Ⅱ）／２５ｍｌ（Ⅱ）。用于测定岩石样品中的铜（Ⅱ）。结果满意。 相似文献
3.
本文收集了我国一些地区的斜发沸石、片沸石和丝光沸石样品,进行了矿物分离、提纯和化学分析,测定了沸石的晶胞参数,将其结果与国外资料进行了对比,指出了我国目前所发现的一些斜发沸石和丝光沸石的特点。 相似文献
4.
稀土元素以及钪、钇等十七个元素,化学性质十分相似,因此相互间的分离及其分量的测定一直是分析化学中的难题之一。近年来,稀土元素的应用越来越广泛(如稀土超导材料的研究应用),同时各学科的发展对稀土杂质要求测定下限越来越低,成为分析测试中急待解决的问题之一。 目前测定稀土元素的方法较多,有光度法、原子发射光谱法、原子吸收光谱法、电化学分析法、活化分析法、质谱法、原子荧光法、化学发 相似文献
5.
建立了在 Ｍ Ｉ Ｂ Ｋ Ａｇ Ｉ萃取体系中用火焰原子吸收法测定与碘定量反应的银,从而间接测定碘含量的快速分析方法。利用碘（ Ｉ－ ）在弱碱性介质中与银（ Ａｇ＋ ）生成 Ａｇ Ｉ,将 Ａｇ Ｉ萃取到有机相甲基异丁基甲酮（ Ｍ Ｉ Ｂ Ｋ）中,用火焰原子吸收测定有机相中银的吸收信号,从而得到相应碘的吸收值,间接求得人发中的碘。 相似文献
6.
介绍了人发洗涤的最佳条件，加标回收率为９０－１０５％，ＲＳＤ为０．６８－５．８５％。用于人发中微量元素ＡＡＳ测定，结果满意。 相似文献
7.
儿童生长发育、免疫功能和智力发育与人体必需的微量元素关系密切。由于头发易于取样和保存，且毛发中元素的含量是血和尿中的10～15倍。因而，头发分析日益受到人们的重视。近年来，相继出现了分析人发中微量元素的各种方法—AAS法、NAA法、XRF法、ICP—AES法等。而在同一消解液中，进行催化示波极谱法测定人发中Zn．Cu、Fe尚未见报道。本文研究、对比了不同的湿法消化体系，在同一份消解液中，进行人发中Zn、Cu、Fe的极谱测定。 相似文献
8.
锌的四元络物光度法研究及应用 总被引：1，自引：0，他引：1
研究了Ｚｎ＾２＋－２－（３,５－二溴－２－吡啶偶氮）－５二乙氨基苯酚－酒石酸钾钠－吐温８０体系形成四元混配合物显色反应条件,确定了络合物的组成,络合物的最大吸收波长λｍａｘ＝５７２ｎｍ方法用于测定脱脂奶粉,人发样品中的微量Ｚｎ＾２＋,结果满意。 相似文献
9.
本文研究了Fe(Ⅲ),Co(Ⅱ),Ni(Ⅱ.),Cu(Ⅱ)在5-Br-PADAP-TritonX-100体系中的析相显色反应。利用该体系具有一定选择性和富集、分离的特点,采用多波长K系数法,根据公式ΔA=A-sum from i=1 to n K_iA_i=KC,在一个测定波长和与干扰组分个数相等的参比波长下,测定混合多组分体系的吸光度。求得相应K值后,再计算各待测组分含量。本法用于测定人发中微量铁、钴、镍、铜取得了满意结果。 相似文献
10.
浙江缙云斜发沸石水的核磁共振分析 总被引：1，自引：0，他引：1
本文应用宽线NMR技术,结合红外测定,研究了缙云斜发沸石中水的结构类型、存在状态、运动特征和热稳定性。结果表明:缙云斜发沸石中的沸石水按其运动特性可以分为受阻旋转水、自由旋转水和自扩散运动水三种类型,它们以谱线中分裂的双线和线宽不同的单峰相区别。低温时,受阻旋转运动的水在晶格中转变为刚性配置。其脱水次序决定于各类型水与沸石结构骨架键合的强弱,脱水是连续的。研究显示缙云斜发沸石的结构骨架相当疏宽,骨架对水分子的吸引力没有严格的方向性,这一特性有利于阳离子的交换。 相似文献
11.
Guboglo M. N. 《GeoJournal》1980,4(1):53-58
International unity is becoming ever stronger in this country owing to an increasing similarity in the development of the cultural environment. This comprises the provision of all the country's republics with a sufficient number of schools, theatres, and other institutions and cultural information media in accordance with the needs of the population. An important part is played by the rise in ‘the general educational level, as well as the level of professional qualifications and skills. Among all the Soviet nations and nationalities, this rise being more rapid among formerly backward peoples. Prominent among the factors of internationalization is the progressive development of the nationalities’ cultural resources, while professional culture is being increasingly brought within the reach of the masses.The implementation of the nationalities policy promotes the all-round development of all Soviet nations and nationalities, their drawing together, the upsurge of the individual capabilities of every Soviet citizen. 相似文献
12.
Jiayu Rong Michael Melchin S. Henry Williams Tatyana N. Koren Jacques Verniers 《《幕》》2008,31(3):315-318
The Global Stratotype Section and Point （GSSP） for the base of the Silurian System was defined in 1985. Since that time, a number of researchers have suggested that this section has serious deficiencies for use as a GSSP. As a result, in 2000, the Subcommission on Silurian Stratigraphy （SSS） proposed undertaking a formal restu@ of this GSSP, which was subsequently approved by the International Commission of Stratigraphy （ICS）. The result of this restudy was the formal proposal that the current GSSP, at 1.6 m above the base of the Birkhill Shale, at Dob＇s Linn, Scotland, should be maintained as the same locality and stratigraphic level, but the bios- tratigraphical definition of the boundary should be revised. The previously defined, basal Silurian grapto- lite zone, the Parakidograptus acuminatus Zone, should be subdivided into a lower Akidograptus ascensus Zone and a higher E acuminatus Zone. The base of the A. ascensus Zone, marked by the first appearance of A. ascensus, should be regarded as the biostratigraphic mark for the base of the Silurian. This proposal has now been formally approved by the SSS and ICS, and ratified by International Union of Geological Sciences. This is the first GSSP to undergo formal restudy and redefini- tion, and the proposal also included a recommended procedure for restudy of GSSPs. 相似文献
13.
Deviation of the major axis of the inertia ellipsoid of the Moon from the direction toward the Earth
B. P. Kondratyev 《Astronomy Reports》2017,61(8):709-714
It is known from observations that the center of mass of the Moon does not coincide with the geometric center of its figure, and the line connecting these two centers is not aligned with the direction toward the center of the Earth, instead deviating toward the Southeast. This stationary deviation of the axis of the inertia ellipsoid of the Moon to the South of the direction toward the Earth is analyzed. A system of five linear differential equations describing the physical libration of the Moon in latitude is considered, and these equations are derived using a new vector method taking into account perturbations from the Earth and partly from the Sun. The characteristic equation of this system is obtained, and all five oscillation frequencies are found. Special attention is paid to the fifth (zero) frequency, for which the solution of the latitude libration equations are stationary and represents a previously unknown additional motion of the rotational axis of theMoon in a cone with a small opening angle. In contrast to the astronomical precession of the Earth, the rotation of the angular-velocity vector is in the positive direction (counter-clockwise), with the period T 3 = 27.32 days. On this basis, this phenomenon has been named “quasi-precession.” This quasi-precession leads to a stationary inclination of the major axis of the inertia ellipsoid of theMoon to the South (for an observer on Earth), making it possible to explain one component of the observed deviation of the center of mass of the Moon from the direction toward the Earth. The opening angle of the quasiprecession cone is approximately 0.834″. 相似文献
14.
Important tendencies in development of the world mineral-resources sector at the beginning of the 21st century were an increase in production and consumption of mineral materials differentiated by types of metals and nonmetallic mineral raw materials, by countries and regions, as well as the concentration of the production of mineral raw materials in a small number of countries, and a reduction in industrial reserves of minerals in the world economy, even at the current stage of their extraction. These tendencies should be taken into account in working out a strategy for development of the Russian mineral raw-material base. 相似文献
15.
Fouad N. Ibrahim Dr. 《GeoJournal》1988,17(1):133-141
Taking the example of W Sudan, an analysis of the climatic incidents leading to the two recent famine disasters is made. On this natural background, the human side is investigated. Focus is directed towards the fragile economic structure of the famine-prone population groups. An early-warning system for famine in the Sahelian Zone is proposed taking grain production and storage, livestock development and the relationship between the prices of livestock and grain as major indicators. 相似文献
16.
东濮凹陷北部沙三中亚段广泛发育盐岩和烃源岩,这两个看似不能共存的物质却在这里互层共生。该时期研究区沉积特征为多盐韵律与多层烃源岩互层共生、连续沉积,单个盐韵律厚度从几米到十几米,烃源岩有机质丰度高、类型好。平面上,两者在湖盆沉积沉降中心共生;垂向上,高有机质丰度、好干酪根类型与高盐度地层具有较好的对应关系。因而成为恢复古气候和古环境的重要研究对象。通过岩石学、古生物学以及Sr/Ba、B/Ga、(V+Ni+Mn)、Fe/Mn、Sr/Cu、Mg/Ca、V/(V+Ni)、稀土元素含量和氯同位素等方法对凹陷北部沙三中亚段的沉积环境进行研究。结果表明,凹陷北部沙三中亚段为深水沉积的还原环境,古盐度较高,达到半咸水-咸水沉积;微量元素和孢粉化石特征表明研究区沙三中亚段为温暖潮湿的环境。 相似文献
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郯庐断裂南段研究进展与断裂性质讨论 总被引：13，自引：3，他引：13
据1：5万区域地质调查和专题研究资料，就郯庐断裂带是否南延与消失的原因，其与大别—苏鲁造山带交截形成的假位错效应，以及与中新生代沉积盆地形成演化的关系等作了新的阐述。在此基础上，讨论了郯庐断裂带是否为巨大的左行平移断层或转换断层。认为郯庐断裂带可能是在“古郯庐带”的基础上于早侏罗世重新活动、白垩纪强烈活动的地堑型枢纽断裂带。 相似文献
20.
The Importance of the Precipitation and the Susceptibility of the Slopes for the Triggering of Landslides Along the Roads 总被引：3，自引：1，他引：2
Clemente Irigaray Francisco Lamas Rachid El Hamdouni Tomás Fernández José Chacón 《Natural Hazards》2000,21(1):65-81
In order to characterise the influence of the heavyrains on the observed landslides during the 1996–1997hydrological cycle, rainfall records for the last 100years are analysed from 104 stations in easternAndalusia. Regarding the amounts of rain recordedbetween October 1996 and March 1997 in the 104stations studied, 31 presented new all-time records;15 presented values that were 80–100% of thepre-1995 record; 49 stations, 80–50%; and 9stations, < 50%. A map has been devised of thesusceptibility of the materials through which thesouth-eastern Andalusian road network crosses,together with an inventory of the damage caused byinstability phenomena on banks and cuttings of theroad network during the winter of 1996–1997. Therelationships between the rainfall during the studyperiod, the damage caused to the road network and thesusceptibility of the materials affected are analysed.The results indicate that there is a clearcorrespondence between the rainfall recorded and thesusceptibility of the materials with the inventorieddamage. It is concluded that the widespread seriousdamage caused in early 1997 to the roads andsurrounding areas in the Alpujarra region and thecoast of the Province of Granada was mainly caused bythe extraordinarily heavy rains. However, considerablyless damage was observed where the susceptibility ofthe terrain is low, thus highlighting the extremeusefulness of terrain-susceptibility maps for riskprevention and territorial planning. 相似文献