Kema terrane: A fragment of a back-arc basin of the early Cretaceous Moneron–Samarga island-arc system, East Sikhote–Alin range, Russian Far East     

Alexander I.  Malinovsky  Vladimir V.  Golozoubov  Vladimir P.  Simanenko  Ludmila F.  Simanenko 《Island Arc》2008,17(3):285-304

Abstract The Kema terrane is a suite of Barremian(?)–Aptian to Albian volcano-sedimentary rocks of Sikhote–Alin that are interpreted as deposits of the back-arc basin of the Moneron–Samarga island-arc system. Compositional features of the different-type deposits indicate a near-slope depositional environment influenced by volcanic processes. Studies of slump fold orientation testify to the accumulation of material from southeast to northwest by gravitational sliding. Compositional characteristics of terrigenous rocks suggest the major provenance for detrital material was an ensialic volcanic island arc. Petrochemical characteristics of basaltic rocks indicate that the formations studied were confined to the back part of the arc.  相似文献   

Electron Probe Microanalysis of Environmental Samples: Preparation of Reference Materials, Correction for Particle Size Effects and Representative Results on Sediments Recovered from Snow, Power Station Fly Ash and Bone Samples     

Ludmila A. Pavlova  Ludmila Ph. Paradina  Olga Yu. Belozerova 《Geostandards and Geoanalytical Research》2001,25(2-3):333-344

In this paper we report the results of electron probe X-ray microanalysis (EPMA) that was used to study environmental materials. The mode of preparation and certification of reference samples based on a basaltic glass matrix for environmental applications of EPMA is described. These samples were prepared containing scandium, strontium and barium (from 0.03 up to 7% m/m) and an evaluation was made of homogeneity, their stability to local heating, followed by analysis by independent methods for certification of composition. Matrix correction procedures for the EPMA technique have been developed for particles having a size commensurable with the volume of X-ray generation. An analytical equation for the size factor is proposed and two techniques for selecting optimum conditions for the analysis of environmental samples by EPMA are reported. These procedures provided satisfactory results when utilized in analysing sediments recovered from snow, coal fly ash and the bones of animals and fish, results from which can be used as indicators for evaluating the pollution level of the lower atmosphere, surface and ground water, as well as revealing pollution mechanisms.  相似文献   

The fundamental statistical properties of the Vening-Meinesz and stokes integral transformations     

Ludmila Kubáčková  Reviewer M. Burda 《Studia Geophysica et Geodaetica》1976,20(3):209-212

Summary The stochastic properties of the vector function, formed by the components and of the deflection of the vertical and by the height of the geoid , are studied by utilizing the mathematical model in[4]. The properties of the error components of the said vector are also studied and a method is described for comparing the results when the vector function was obtained directly by means of astro-geodetic methods and when the vector function was generated by the Vening-Meinesz and Stokes transformation.  相似文献   

The present approach to the study of the least-squares method     

Lubomír Kubáček  Ludmila Kubáčková  Reviewer J. Vondráček 《Studia Geophysica et Geodaetica》1978,22(2):140-147

Summary The present approach to the study of the least squares method which lies in introducing the basic principle of this method into various functional metric spaces is dealt with.  相似文献   

Statistical properties of echoes from meteoric trails during forward scattering at 40 MHz     

Třísková  Ludmila 《Studia Geophysica et Geodaetica》1966,10(4):475-480

Резюме Сигнал на частоте 40 мгц рассеянный вперед метеорными следами принимался с апреля 1962 г. по январь 1965 г. на трассе длиной 1140 км. Описана приемная аппаратура и метод овравотки материалов. Показан суточный и годовой хоы числа принятых сигналов их подолжительности и козффициента запольнения, влияние спорадическпго слояE и метеорных ливней. Относительные данные, вытекаюшие из работы, можно считать характерными также для других трасс.

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Address: Boční II, Praha 4-Spořilov.  相似文献   

Sampling, Sample Preparation and ICP-MS Chemical Analysis of Lake Baikal Sponges     

Ludmila Ph. Paradina  Natalie N. Kulikova  Alexander N. Suturin  Yelena V. Saibatalova 《Geostandards and Geoanalytical Research》2004,28(2):225-232

Procedures for sampling, sample preparation and ICP-MS analysis of endemic sponges from Lake Baikal have been developed. Sample decomposition was carried out using an open acid decomposition with ultrasound treatment. The distribution of nineteen elements (Mg, Al, P, Ca, Ti, Mn, Co, Ni, Cu, Rb, Sr, Y, Cd, Ba, La, Ce, Pb, Th and U) in different parts of a sponge's body (outer and inner layers and layers adjacent to the substratum) was studied. Detection limits were determined; these ranged from 0.013 to 4.12 μg g^-1 for trace elements and from 23 to 130 μg g^-1 for biogenic elements. The degree of elemental uptake by living substances is discussed with regard to the environment.  相似文献   

An effective estimator of the dispersion from data affected by a systematic influence     

Lubomír Kubáček  Ludmila Kubáčková  Reviewer J. Rataj  Reviewer P. Holota 《Studia Geophysica et Geodaetica》1989,33(4):307-314

Summary A theorem on the invariance of a unit dispersion estimator with respect to a transformation eliminating a systematic influence from measured data is presented. In the case of a normally distributed observation vector the resulting estimator of the unit dispersion is unbiased, uniformly (with respect to the parametric space) effective and invariant (with respect to the first order parametric space). A typical domain of application is the case of processing results of measurements by gravimeters.  相似文献   

The Effects of Operational Parameters on the Iron(III) Uptake by Micro‐Algae Dunaliella salina          下载免费PDF全文

Lilia Anghel  Gheorghe Duca  Liliana Cepoi  Iulia Iatco  Ludmila Rudi  Raul Victor Erhan 《洁净——土壤、空气、水》2018,46(7)

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Time delays in the correlation between solar activity and the F2 region plasma frequency     

Ludmila Triskova  Vladimir Truhlik  Katerina Podolska 《Journal of Atmospheric and Solar》2011,73(5-6):623-626

The upper ionosphere electron density characterized by the critical frequency foF2 is correlated with solar activity when using monthly medians or averages from longer intervals. When shorter intervals are studied, time delays of different lengths in solar activity effects in the ionosphere are observed. The correlation between the foF2 values and the solar radiation intensity, given by the F10.7 index, is studied using the 1967–2003 data of mid-latitude ionosonde stations spaced at distances greater than 100° in geographical longitude. At which longitude the reaction of foF2 to the changes in solar activity appears sooner depends on the position of the interval studied in the 22-year solar cycle.  相似文献   

Estimation of Organic Pesticide Residues in Wines of Moldova     

Gheorghe Duca  Rodica Sturza  Ludmila Siretanu 《洁净——土壤、空气、水》2012,40(6):661-666

This paper presents the study of pesticide residues in Moldovan wine products originating from traditional agriculture because the appreciation of these compounds is an important aspect of food safety. During 2007–2010, about 3000 analyses of wine samples using GC‐MS were investigated. Persistent organic pollutants (POPs), i.e., α‐, β‐, γ‐HCH, aldrine, and heptachlor were not found in any of the samples. Insignificant quantities of metalaxyl and mefenoxam were found in some wine samples. The missing of POPs in wine products represents an important quality feature. The study showed that if growers comply with rules of phytosanitary treatments and the waiting period is respected, the content of pesticide residues can be reduced to safe limits. Also, the list of approved pesticides must be regularly revised, taking into account the degree of toxicity. Additionally, growers are to be constantly informed about effectuated changes.  相似文献