Spurenelemente in der Aare (Schweiz)     

G. Bart  H. R. von Gunten 《Aquatic Sciences - Research Across Boundaries》1977,39(2):277-298

Instrumental neutron activation analysis was used for the determination of more than 20 trace and minor elements in water and silt samples (suspended load) of the river Aare. The samples were collected at four different locations along the river between its source and the lake of Bienne. The principal results are: 1. The concentrations of all elements investigated are much lower than WHO-limits for drinking water. 2. Human activities are responsible for an increase of some elements along the river. 3. The concentrations of dissolved trace elements are generally anticorrelated with the water flow rate. 4. The concentrations of the trace elements in particulates (in μg/l) are correlated with the flow rate of water. Except for Ca?Sr there are no significant interelement correlations for all four sampling stations.  相似文献   

A modelling of effects of variable saturation in invaded zone near borehole on neutron tool response in the gas-bearing Miocene formations of the Carpathian foredeep,Poland     

M. Bała  U. Woźnicka  T. Zorski  A. Drabina 《Journal of Applied Geophysics》2011,73(1):84-91

Invasion of mud filtrate from the borehole into the surrounding formation can significantly alter the response of logging tools.In this paper the neutron tool response was calculated for a gas-bearing rock crossed by the borehole.The invaded zone is characterized by variable fluid and gas saturation and is defined by a specific hyperbolic function. The saturation function is based on the characteristics of Polish Carpathian Foredeep Miocene formations reached in gas-bearing rocks. The whole system including neutron tool equipped with Am-Be neutron source and a set of neutron detectors, borehole, invaded zone, and virgin zone, was numerically modeled and used as the input to the Monte-Carlo neutron transport code. The response of each detector was calculated for different combinations of porosity and saturation of invaded zone and virgin zone.  相似文献   

Hydroacoustic analysis of spatial and temporal variability of bottom sediment characteristics in Lake Kinneret in relation to water level fluctuation   总被引：1，自引：1，他引：0  

Ilia Ostrovsky  Jarosław Tęgowski 《Geo-Marine Letters》2010,30(3-4):261-269

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Search for GRB related prompt optical emission and other fast varying objects with “Pi of the Sky” detector     

M. Ćwiok  W. Dominik  K. Małek  L. Mankiewicz  J. Mrowca-Ciułacz  K. Nawrocki  L. W. Piotrowski  P. Sitek  M. Sokołowski  G. Wrochna  A. F. Żarnecki 《Astrophysics and Space Science》2007,309(1-4):531-535

Experiment “Pi of the Sky” is designed to search for prompt optical emission from GRB sources. 32 CCD cameras covering 2 steradians will monitor the sky continuously. The data will be analysed on-line in search for optical flashes. The prototype with 2 cameras operated at Las Campanas (Chile) since 2004 has recognised several outbursts of flaring stars and has given limits for a few GRB.  相似文献   

A Review of Cometary Outbursts at Large Heliocentric Distances     

P. Gronkowski  M. Wesołowski 《Earth, Moon, and Planets》2016,117(1):23-39

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Variability of high rainfalls and related synoptic situations causing heavy floods at the northern foothills of the Tatra Mountains     

Tadeusz Niedźwiedź  Ewa Łupikasza  Iwona Pińskwar  Zbigniew W. Kundzewicz  Markus Stoffel  Łukasz Małarzewski 《Theoretical and Applied Climatology》2015,119(1-2):273-284

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The Impact of New EUV Diagnostics on CME-Related Kinematics     

Scott W. McIntosh  Bart De Pontieu  Robert J. Leamon 《Solar physics》2010,265(1-2):5-17

We present the application of novel diagnostics to the spectroscopic observation of a Coronal Mass Ejection (CME) on disk by the Extreme Ultraviolet Imaging Spectrometer (EIS) on the Hinode spacecraft. We apply a recently developed line profile asymmetry analysis to the spectroscopic observation of NOAA AR 10930 on 14?–?15 December 2006 to three raster observations before and during the eruption of a 1000 km?s^?1 halo CME. We see the impact that the observer’s line-of-sight and magnetic field geometry have on the diagnostics used. Further, and more importantly, we identify the on-disk signature of a high-speed outflow behind the CME in the dimming region arising as a result of the eruption. Supported by recent coronal observations of the STEREO spacecraft, we speculate about the momentum flux resulting from this outflow as a secondary momentum source to the CME. The results presented highlight the importance of spectroscopic measurements in relation to CME kinematics, and the need for full-disk synoptic spectroscopic observations of the coronal and chromospheric plasmas to capture the signature of such explosive energy release as a way of providing better constraints of CME propagation times to L1, or any other point of interest in the heliosphere.  相似文献   

Comparison of P- and S-waves velocities estimated from Biot-Gassmann and Kuster-Toksöz models with results obtained from acoustic wavetrains interpretation     

Maria BałA  Adam Cichy 《Acta Geophysica》2007,55(2):222-230

Kuster-Toksöz and Biot-Gassmann models for estimating velocities of longitudinal and shear waves on the basis of well-logging data were analysed. P-wave and S-wave velocity models are crucial for interpretation of seismic data. Discussed models enable determination with quite good accuracy, in some cases higher than the acoustic full wavetrains interpretation. Because velocity strongly depends on lithology and saturation of pore space, the selection of parameters of rock matrix, hydrocarbons and formation waters has a strong effect on the quality of velocities estimation.  相似文献   

Types of sedimentary environment in alluvial sediments distinguished on the basis of its chemical constitution: the example of the lower course of the Obra river (Western Poland)   总被引：1，自引：1，他引：0  

Marcin Słowik  Tadeusz Sobczyński  Zygmunt Młynarczyk 《Environmental Earth Sciences》2010,59(5):957-966

Research concerning chemical constitution of alluvial sediments was done in the lower course of the Obra river (Western Poland). The fragment of vertical profile, which consisted of various alluvial sediments (fine sands, peats, and sandy silts) was chosen for detailed analysis. The main research problem was to determine if lithology and chemical constitution of alluvial deposits are interconnected in a distinct way within studied section of the Obra river valley, and, if changes of chemical elements’ concentration could be used to illustrate depositional processes, which take place in riverbed and floodplain. Concentrations of Fe, Mn, Cu, Zn, Ca, Mg, and K were determined in collected sediment samples. Next, geochemical groups of alluvial sediments were distinguished using cluster analysis. Investigated changes of chemical elements’ concentration show that there is a distinct border between the environment of organic sediments, which marks the place of former functioning of the Obra riverbed, and sandy silts, which were deposited within floodplain during floods. Besides, floodplain sediments, riverbed sediments, and reductive environment within peat deposits were singled out on the basis of the analysis.  相似文献   

Simulation of an uncertain emission market for greenhouse gases using agent-based methods     

Zbigniew Nahorski  Jarosław Stańczak  Piotr Pałka 《Climatic change》2014,124(3):647-662

The paper presents the problem of a simulation of the greenhouse gases emission permits market where only low accuracy emission amounts are known. An organization of the market with uncertain emissions is proposed and trading rules for individual market participants are discussed. Simulation of the market is based on a multi-agent system. Negotiation of purchase/sale prices between the parties are introduced, where the trading parties adopt one of two options: (i) bilateral negotiations, and (ii) sealed bid reverse auctions. Results of simulation runs show trajectories of transaction prices, as well as probability distributions of learning agents’ bidding prices.  相似文献