Stochastic modeling of seismic surface rotations     

Alberto Castellani  Zbigniew Zembaty 《Natural Hazards》1994,10(1-2):181-191

In this paper, a stochastic analysis of surface rotations during earthquakes is presented. The surface motion is modeled by a spacetime random field. A method to obtain rotation based on direct differentiation of the random field is proposed with a reference to a second method based on wave decomposition. The first method leads to a spectral density of surface rotations in terms of point translation spectral density, coherence function and apparent waves velocity, while the second method formulates the rotational spectrum in terms of point translation spectral density and wave parameters. The advantages and disadvantages of both methods are discussed in detail.On leave from: Faculty of Civil Engineering, Technical University, ul. Katowicka 48, 45–951 Opole Poland.  相似文献   

Distribution of time lags between successive petroleum exploration activities     

Zbigniew ?ucki  Zbigniew Szkutnik 《Mathematical Geology》1990,22(5):523-556

Four time lags are studied: (1) drilling activity behind seismic activity; (2) oil and gas reserves discovered behind drilling activity; (3) oil and gas production behind reserves discovered; and (4) oil and gas production behind drilling activity. A ridge regression method is used to estimate the distributions of these lags for 50 countries and regions active in petroleum exploration. A complete review of obtained results is given as well as an interpretation of estimated models and failed ridge regressions. Five types of distributions have been found: decreasing monotonically, unimodal, bimodal, uniform, and increasing monotonically. The distributions allow estimating the capital freezing in the exploration process and assessing the resulting policy made by all companies active in a country. For example, the actual exploration history in Poland is analyzed with the use of distributed time-lag approach and net present-value concept. An overinvestment in drilling in comparison with petroleum infrastructure has been stated on the basis of the excessive lagging of production behind drilling activity. A direction of further lag studies is also suggested.  相似文献   

Fourth international symposium on land subsidence Houston,Texas, USA 12–15 May 1991     

Zbigniew Perski 《GeoJournal》1990,20(4):429-430

Fourth international symposium on land subsidence Houston, Texas, USA 12–15 May 1991  相似文献   

On reconstruction of the Ito-like equation from persistent time series     

Zbigniew Czechowski 《Acta Geophysica》2013,61(6):1504-1521

The Langevin equation with finite-range persistence was introduced as a macroscopic model of various geophysical phenomena. The modified histogram procedure (MHP) of reconstruction of the equation from time series was proposed. An efficiency of MHP was tested on artificial persistent time series (with short and long-tail distributions) generated by different Ito-like equations. For an exemplary geophysical time series, the appropriate Ito-like equation was reconstructed.  相似文献   

A search for interstellar pyrimidine   总被引：1，自引：0，他引：1  

Yi-Jehng Kuan  Chi-Hung Yan  Steven B. Charnley  Zbigniew Kisiel  Pascale Ehrenfreund  Hui-Chun Huang 《Monthly notices of the Royal Astronomical Society》2003,345(2):650-656

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On the vertical distribution of passive species in the atmospheric boundary layer     

Zbigniew Sorbjan 《Boundary-Layer Meteorology》1986,35(1-2):73-81

A similarity theory presented by Sorbjan (1986) is extended by taking into consideration diffusion of passive species (e.g., specific humidity) in the atmospheric boundary layer. Theoretical similarity functions are obtained for the convective and stable-continuous regimes.On leave from Institute of Environmental Engineering, Warsaw Technical University, Poland.  相似文献   

Comments on ‘scaling the atmospheric boundary layer’     

Zbigniew Sorbjan 《Boundary-Layer Meteorology》1987,38(4):411-413

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Investment policy in the Polish transport sector: An appraisal     

Dr. Zbigniew Taylor 《GeoJournal》1987,15(1):107-112

The common nature of investment policy in the Polish transport system is analysed. The transport system should contribute to national economic growth by providing an efficient service to all sections of industry, agriculture and services, and by ensuring the maintenance of a reasonable level of personal mobility through public passenger facilities. Meanwhile, as shown in the first part of the paper, the volume of transport inputs, 1970–1984 were relatively low and, moreover, their allocation among different modes of transport — not always correct. Some specific features of investment policy in the 1970s are described. Finally, the present-day phenomena and problems characteristic of Polish transport — being mainly a result of improper past policy and nowadays crisis situation — are presented. Paper presented to the IGU Working Group on Geography of Transport: Symposium No. W11, 25–29 August 1986, León, Spain.  相似文献   

Some numerical urban boundary-layer studies   总被引：2，自引：0，他引：2  

Zbigniew Sorbjan  Marek Uliasz 《Boundary-Layer Meteorology》1982,22(4):481-502

Two types of models, describing respectively the thermal and the dynamic structure of the urban boundary layer are presented. The influence of density and height of urban buildings, urban traffic, man-made heat flux, changes of albedo and existence of an aerosol layer are tested. The models give a possibility of explaining the influence of selected factors on the atmospheric state over an urban area.On sabbatical at Meteorological Department, University Uppsala, Sweden.  相似文献   

Transformation of random distributions into power‐like distributions due to non‐linearities: application to geophysical phenomena     

Zbigniew Czechowski 《Geophysical Journal International》2001,144(1):197-205

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