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Tytuł:
Effect of settlement of foundations on the failure risk of the bottom of cylindrical steel vertical tanks for liquids
Autorzy:
Hotala, Eugeniusz
Ignatowicz, Rajmund
Powiązania:
https://bibliotekanauki.pl/articles/178299.pdf
Data publikacji:
2019
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
steel tank
soil settlement
tank deformations
plastic deformations
failure risk
Opis:
Different types of foundations are used in steel, above-ground cylindrical storage tanks for liquids. If a sand-gravel foundation is used under the entire bottom of the tank or only in the central part of the tank, settlement can be expected, and it increases after many years of operation. The paper presents the typical kinds and types of soil settlements under the bottoms of the tanks, in which different types of foundations were used. Numerical analyses of the effect of the soil settlement on the state of deformations and stresses in steel sheets of the bottom under one of the real tanks, in which different types of foundations and different cases of settlement were assumed. The results of numerical analyses indicated the possibility of evaluating the state of the soil settlement and bottom sheet deformations on the basis of simple measurements of deformations of the lower part of the tank cylinder. These measurements can be very useful in assessing the possible risk of failure of the tank bottom during each period of its operation, as measurements of settlement of the bottom of a filled tank are not feasible in practice. It has been proposed that in each steel tank, the deformation of the cylinder’s sheets should be measured even before the beginning of exploitation, and that in subsequent periodical measurements, the influence of the soil settlement under the tank on the state of the cylinder deformation and bottom’s strain should be assessed more accurately.
Źródło:
Studia Geotechnica et Mechanica; 2019, 41, 3; 171-176
0137-6365
2083-831X
Pojawia się w:
Studia Geotechnica et Mechanica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Simplified Probabilistic Analysis of Settlement of Cyclically Loaded Soil Stratum by Point Estimate Method
Autorzy:
Przewłócki, J.
Górski, J.
Świdziński, W.
Powiązania:
https://bibliotekanauki.pl/articles/241272.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Instytut Budownictwa Wodnego PAN
Tematy:
soil settlement
seismic loading
random material parameters
point estimated method
Opis:
The paper deals with the probabilistic analysis of the settlement of a non-cohesive soil layer subjected to cyclic loading. Originally, the settlement assessment is based on a deterministic compaction model, which requires integration of a set of differential equations. However, with the use of the Bessel functions, the settlement of a soil stratum can be calculated by a simplified algorithm. The compaction model parameters were determined for soil samples taken from subsoil near the Izmit Bay, Turkey. The computations were performed for various sets of random variables. The point estimate method was applied, and the results were verified by the Monte Carlo method. The outcome leads to a conclusion that can be useful in the prediction of soil settlement under seismic loading.
Źródło:
Archives of Hydro-Engineering and Environmental Mechanics; 2016, 63, 2-3; 121-133
1231-3726
Pojawia się w:
Archives of Hydro-Engineering and Environmental Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of inertia forces on soil settlement under harmonic loading
Autorzy:
Wrana, B.
Pietrzak, N.
Powiązania:
https://bibliotekanauki.pl/articles/178311.pdf
Data publikacji:
2013
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
model Biota
dynamika gruntów
ośrodek porowaty
osiadanie gruntu
porous solid
soils
soil dynamic
soil settlement
Biot model
Opis:
The paper deals with the comparison of Biot’s model for saturated, porous soils with other simplified models used in dynamic analysis. The purpose of this paper is to determine some limits of validity of the various models. In order to do this a full set of governing, dynamic equations of Biot model and a series of simplifying models such as u-p simplification and quasi-static consolidation models are considered. These formulations are applied to a simple soil layer under periodic surface loading. A displacement of skeleton and a displacement of fluid are shown and compared with each model for various formulations.
Źródło:
Studia Geotechnica et Mechanica; 2013, 35, 1; 245-258
0137-6365
2083-831X
Pojawia się w:
Studia Geotechnica et Mechanica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of the foundation slab settlement of the “Africa Pavilion” facility in Wrocław
Autorzy:
Sawicki, E.
Strzelecki, T.
Powiązania:
https://bibliotekanauki.pl/articles/178401.pdf
Data publikacji:
2015
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
soil consolidation
numerical calculations
settlement
hydraulic conduits
Opis:
This article presents the results of numerical calculations of soil consolidation underneath the “Africa Pavilion” structure in Wrocław Zoo, Poland. To determine the deformations of the baseplate of the “Africa Pavilion” and deformations of the subsoil, Biot’s consolidation theory for two-phase medium was applied. The calculations were carried out using the professional program FlexPDE v.6, which is based on the Finite Element Method. Numerical calculations performed were used to evaluate the design assumptions allowing for the laying of hydraulic conduits under the slab.
Źródło:
Studia Geotechnica et Mechanica; 2015, 37, 4; 47-55
0137-6365
2083-831X
Pojawia się w:
Studia Geotechnica et Mechanica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Settlement Analysis of a Sandy Clay Soil Reinforced with Stone Columns
Autorzy:
Boru, Yada Tesfaye
Negesa, Adamu Beyene
Scaringi, Gianvito
Puła, Wojciech
Powiązania:
https://bibliotekanauki.pl/articles/2172889.pdf
Data publikacji:
2022
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
stone column
sandy clay soil
excavation replacement method
settlement
hardening soil model
Opis:
Mat foundations are most typically used in locations featuring weak soils such as soft clays and silts, particularly when building in demanding geotechnical conditions. Because of their poor engineering characteristics and significant difficulties associated with workability, these soils are often removed or avoided by excavating down to a specific depth. However, if thick layers are present, their removal becomes unpractical, costly, and creates inconvenience during construction. To overcome this issue, various reinforcement strategies can be adopted. In this study, the use of stone columns under mat foundations was investigated via numerical modeling. Two scenarios were compared: one in which stone columns were installed without any soil removal and another in which a layer of soft ground was removed and the foundation was installed without any ground treatment. Numerical results showed the clear beneficial effect of stone columns, which can significantly reduce settlements even in the presence of a thick deformable soil layer.
Źródło:
Studia Geotechnica et Mechanica; 2022, 44, 4; 333--342
0137-6365
2083-831X
Pojawia się w:
Studia Geotechnica et Mechanica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Reviews on Finite Element Modeling Practices of Stone Columns for Soft Soil Stabilization Beneath an Embankment Dam
Autorzy:
Teshager, Daniel Kefelegn
Belayneh, Henok Lemma
Powiązania:
https://bibliotekanauki.pl/articles/2172888.pdf
Data publikacji:
2022
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
embankment
soft soil
settlement
stone column
slope stability
consolidation
Opis:
This article reviews the numerical approach in stone column practices and presents the benefits of stone columns as a ground improvement of soft soil to support an embankment dam. In this article, the methodological approaches to numerically modeling stone columns in both 2D and 3D studies, as well as the selection of an appropriate constitutive model are discussed. The numerical practices for the installation of the stone column and the validation procedures used to ensure the accuracy of the numerical analysis are also explained. In addition to that, the study also presents the benefits of stone columns in improving settlement behavior, slope stability, and decreasing the end time of consolidation. Parameters that influence the performance of the stone column with their respective results are also assessed.
Źródło:
Studia Geotechnica et Mechanica; 2022, 44, 4; 343--353
0137-6365
2083-831X
Pojawia się w:
Studia Geotechnica et Mechanica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of long-term liming on aggregate stability of a loess-derived soil
Autorzy:
Becher, H.H.
Powiązania:
https://bibliotekanauki.pl/articles/26627.pdf
Data publikacji:
2001
Wydawca:
Polska Akademia Nauk. Instytut Agrofizyki PAN
Tematy:
Bavaria
soil
settlement
surface sealing
loess
loess-derived soil
liming
aggregate stability
meliorative effect
Źródło:
International Agrophysics; 2001, 15, 2
0236-8722
Pojawia się w:
International Agrophysics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Collapse settlement of dump soils revealed by studies on soil samples of modelled lithology and lump-size distribution
Autorzy:
Woźniak, H.
Powiązania:
https://bibliotekanauki.pl/articles/2060288.pdf
Data publikacji:
2015
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
dump soil
dumped fill
collapse settlement
collapse potential
double porosity
Opis:
The paper deals with the collapse settlement of dump soils i.e., made grounds composed of the overburden soils of mineral deposits, which were worked out with the open-pit method, transported and deposited as a dumped fill. The principal aim of the studies was the analysis of factors controlling the collapse settlement process, mostly the structural model of dump soil and external determinants: initial compaction, initial water content and history of its changes in time as well as the history of loading of studied soil before saturation. In order to reflect the natural structure of dump soils, experiments were carried out on samples of specially modelled lithology and structure. Hence, the samples represented three basic structural models of such soils: non-cohesive, cohesive and transitional, partly cohesive/partly non-cohesive. Attention was paid to diversified dynamics of collapse settlement, which results from two clearly different processes: rebuilding of soil structure and additional consolidation settlement. It was found that from the physical point of view the collapse settlement results from the release of elastic energy delivered to the sample by loading before inundation and accumulated at the contact surfaces of soil lumps.
Źródło:
Geological Quarterly; 2015, 59, 2; 391--399
1641-7291
Pojawia się w:
Geological Quarterly
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Amazonian Dark Earths in the context of pre-Columbian settlements
Autorzy:
Golińska, B.
Powiązania:
https://bibliotekanauki.pl/articles/184277.pdf
Data publikacji:
2014
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
Amazon
anthropogenic soil
pre-Columbian settlement
Amazonian Dark Earths
terra preta
Opis:
Important information about pre-Columbian Amazonian settlement and economy provide Amazonian Dark Earths (ADE), black or brown soils characterized by the presence of charcoal in high concentrations, with highly elevated nutrients and organic matter and higher pH level. Usually ADE are related to large concentrations of ceramics, stone artifacts and animal remains. The main factor for the initiation of ADE formation was the long-lasted, fully sedentary pre-Columbian settlement. Its size and a form can be correlated with traces of historical human habitation. Thus, these sites can reflect the social organization of a specific group. Therefore, ADE studies can bring much valuable information concerning pre-Columbian settlement in Amazonia.
Źródło:
Geology, Geophysics and Environment; 2014, 40, 2; 219-232
2299-8004
2353-0790
Pojawia się w:
Geology, Geophysics and Environment
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Slurry shield tunneling in soft ground. Comparison between field data and 3D numerical simulation
Autorzy:
Beghoul, Mohammed
Demagh, Rafik
Powiązania:
https://bibliotekanauki.pl/articles/178799.pdf
Data publikacji:
2019
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
shield tunnelling
soil-structure interaction
3D numerical simulation
back analysis
settlement
Opis:
In urban areas, the control of ground surface settlement is an important issue during shield tunnel-boring machine (TBM) tunneling. These ground movements are affected by many machine control parameters. In this article, a finite difference (FD) model is developed using Itasca FLAC-3D to numerically simulate the whole process of shield TBM tunneling. The model simulates important components of the mechanized excavation process including slurry pressure on the excavation face, shield conicity, installation of segmental lining, grout injection in the annular void, and grout consolidation. The analysis results from the proposed method are compared and discussed in terms of ground movements (both vertical and horizontal) with field measurements data. The results reveal that the proposed 3D simulation is sufficient and can reasonably reproduce all the operations achieved by the TBM. In fact, the results show that the TBM parameters can be controlled to have acceptable levels of surface settlement. In particular, it seems that moderate face pressure can reduce ground movement significantly and, most importantly, can prevent the occurrence of face-expected instability when the shield crosses very weak soil layers. The shield conicity has also an important effect on ground surface settlement, which can be partly compensated by the grout pressure during tail grouting. Finally, the injection pressure at the rear of the shield significantly reduces the vertical displacements at the crown of the tunnel and, therefore, reduces the settlement at the ground surface.
Źródło:
Studia Geotechnica et Mechanica; 2019, 41, 3; 115-128
0137-6365
2083-831X
Pojawia się w:
Studia Geotechnica et Mechanica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analiza ściśliwości warstwowanych iłów krakowieckich
Analysis of compressibility of layered Krakowiec Clays
Autorzy:
Wilk, K.
Powiązania:
https://bibliotekanauki.pl/articles/2075139.pdf
Data publikacji:
2014
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
iły krakowieckie
warstwowa budowa gruntu
ściśliwość gruntu
osiadanie pali
Krakowiec clays
layered soil structure
soil compressibility
settlement of piles
Opis:
The substrate, whose compressibility has been analysed, served as subsoil for indirect foundations of bridges. A significant settlement of foundations was recorded while performing load tests. The results of the analysis indicate the specific structure of the Krakowiec Clays, as the cause of insufficient bearing capacity of piles. Small thickness of clay and silt layers prevents their separation, and certainly does not allow treating them as two soil types with different properties. The tested soil should be considered as a kind of natural composite, whose characteristics are unlikely to be "the resultant" of properties of constituent soils. Despite the high soil strength (very high values of strength parameters), the measured oedometer compression modules were significantly different from the standard attributed to this type of soils. The values of oedometer compression modules correspond with those prescribed by back analysis of settlement measured during the load test of piles. They were tested on natural undisturbed samples and on prepared samples of different humidities (from soil paste). The results were compared with those obtained by other researchers for soils of similar origin and alike physical properties.
Źródło:
Przegląd Geologiczny; 2014, 62, 5; 250--256
0033-2151
Pojawia się w:
Przegląd Geologiczny
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Peat consolidation -- new approach
Autorzy:
Mayer, Z.
Coufal, R.
Kowalów, M.
Szczygielski, T.
Powiązania:
https://bibliotekanauki.pl/articles/230952.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
wzmocnienie gruntu
konsolidacja gruntu
konsolidacja torfu
osiadanie
ground improvement
soil consolidation
peat consolidation
settlement
Opis:
The problem of consolidation of soil has been widely investigated. The basic approach was given by Terzaghi who assumed soil of constant physical and mechanical parameters. In the case of peat consolidation, the permeability coefficient of soil and the elasticity modulus are functions of the settlement which is an important additional factor. The model proposed here assumes varying the elasticity and permeability coefficients. Moreover, the settlement is described by the so-called elementary curve which was approximated empirically based upon laboratory tests. The model allows to consider the case when the filtration in the peat body goes in horizontal direction. It happens so when the charging layer does not receive outgoing water from the pores. The model includes also the case when the load involving consolidation varies in time i.e. the charging layer grows up gradually. The model has been applied practically in several cases and it comes that there is a good agreement between calculated and measured settlement of the consolidated peat layer.
Źródło:
Archives of Civil Engineering; 2011, 57, 2; 173-186
1230-2945
Pojawia się w:
Archives of Civil Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modeling and analysis of ground settlement between a flyover and reinforced soil embankment
Modelowanie i analiza osiadań pomiędzy wiaduktem a nasypem z gruntu zbrojonego
Autorzy:
Bukowski, M.
Łysiak, P.
Oleszek, R.
Trochymiak, W.
Powiązania:
https://bibliotekanauki.pl/articles/231263.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
wiadukt drogowy
przyczółek
grunt zbrojony
osiadanie
uskok
flyover
reinforced soil
bridge abutment
settlement
offset
Opis:
Development of the transport infrastructure in Poland has contributed to the implementation of various technologies of construction of bridges and their components. Use of reinforced soil for construction of embankments, retaining structures (RSS walls) and abutments is one of the solutions which has been frequently used for the past twenty years. Shortly after its development, the technology proposed by Henri Vidal in 1966 also gained appreciation in Poland [4]. Reinforced soil bridge abutments started to be widely used in Poland at the turn of the 20th century. The bridge facilities at the junction of Trasa Siekierkowska route and Wał Miedzeszyński Street in Warsaw, which were built in the years 2000÷2002, are an example of structures from that period. The authors of this paper have been particularly interested in the outermost supports of the reinforced concrete flyovers which were constructed in the form of intermediate reinforced soil abutments. Offsets – the vertical displacements, in the range of 15÷25mm, emerging between the level of the road surface and the steel elements of the expansion joints which separate the flyover’s structure from the embankment – were observed in 2015, in the course of regular inspections. While accounting for the observations which have been made, the surveying measurements and the ground investigation, the paper diagnoses and describes the mechanism which led to the emergence of the offsets. Potential patterns of the occurrence of additional settlements, as the reason for emergence of the offsets, were identified and analyzed. The settlement of the outermost support (abutment), as a result of increase of relative density of alluvial sands due to the dynamic interaction of the roadways of Wał Miedzeszyński Street, was analyzed. Analytical and numeric approaches were used in the course of analysis while relying on PLAXIS and MIDAS software.
Rozbudowa infrastruktury komunikacyjnej w Polsce przyczyniła się do wdrożenia różnych technologii budowy obiektów mostowych i poszczególnych ich elementów. Jednym z często stosowanych rozwiązań, od ponad 20 lat, jest zastosowanie gruntu zbrojonego do budowy nasypów, konstrukcji oporowych i przyczółków. Technologię zaproponowaną przez Henri Vidal’a w 1966 roku doceniono również w Polsce niewiele lat później. Jednakże przyczółki mostowe z gruntu zbrojonego zaczęły upowszechniać się w Polsce dopiero na przełomie XX i XXI wieku. Przykładem konstrukcji z tamtego okresu są analizowane obiekty mostowe wybudowane w Warszawie w latach 2000÷2002. Szczególne zainteresowanie autorów dotyczyło podpór skrajnych żelbetowych wiaduktów wybudowanych w postaci przyczółków pośrednich z gruntu zbrojonego. W przyczółkach tych słupy są usytuowane przed licem ściany oporowej i opierają się na prostokątnych oczepach, posadowionych na dwóch rzędach pali wierconych o średnicy 1,0m długości 11,0÷15,0m. Pobocznice pali otacza (licząc od spodu oczepu) warstwa nasypów o miąższości 0,0÷3,0m, zastoiskowej gliny pylastej 1,0÷3,0m, warstwa aluwialnych piasków średnich lub grubych o aktualnym stopniu zagęszczenia ID= 0,60. Pod stopami pali, które posadowiono w piaskach grubych z przewarstwieniami pospółki o ID= 0,80, wykonano iniekcję cementową. W roku 2015 na urządzeniach dylatacyjnych, nad podporą skrajną od strony Wisły, pomierzono uskoki (progi) o wysokości 15÷25mm, które powodowały odczuwalne drgania przęsła wiaduktu towarzyszące przejazdom taboru ciężarowego. Stwierdzono również deformacje bryły gruntu zbrojonego oraz nieregularne przemieszczenia paneli osłonowych w kierunku podłużnym i poprzecznym nasypu. Dostrzeżono także wychylenie prefabrykowanych ścian lica od pionu jak również kilka spękanych prefabrykatów. Z późniejszych pomiarów wynikało, że nad płytą przejściową i na odcinku 8,0m za płytą nie utworzyła się niecka (lokalne obniżenie), która mogłaby świadczyć o osiadaniu nasypu z gruntu zbrojonego. Nie odnotowano również przyrostu pionowych i poziomych przemieszczeń. Uwzględniając poczynione obserwacje, pomiary oraz archiwalne i wykonane w 2016 roku badania geotechniczne, analizowano przyczyny powstania uskoku. Podczas analiz stosowano analityczne i numeryczne podejścia obliczeniowe. Analityczne w przypadku pala pojedynczego i grup pali z uwzględnieniem wyników próbnych obciążeń pali oraz według polskich przepisów normowych z uwzględnieniem wpływu efektów dynamicznych i stanu granicznego naprężeń w gruncie zbrojonym. Analizy numeryczne wykonano za pomocą programów MIDAS GTX NX (3D) i PLAXIS (2D) stosując różne modele gruntu, w tym model sprężysto-plastyczny z warunkiem Coulomba-Mohra.
Źródło:
Archives of Civil Engineering; 2018, 64, 4/II; 77-100
1230-2945
Pojawia się w:
Archives of Civil Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Numerical analysis of consolidation settlement and creep deformation of artificial island revetment structure in a large-scale marine reclamation land project
Autorzy:
Zhao, J.
Zhou, T.
Wang, G.
Powiązania:
https://bibliotekanauki.pl/articles/258848.pdf
Data publikacji:
2015
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
marine reclamation land
Soft-Soil-Creep model
consolidation settlement
pore pressure
micro-structure
numerical analysis
Opis:
In order to analyze the influential factors of soft foundation settlement in a marine reclamation land project, the consolidation settlement and pore pressure dissipation of the entire area are numerically simulated using Soft-SoilCreep Model, in which the PLAXIS finite element software for professional geotechnical engineering is applied and empirical data of Japanese Kansai’s airport project are used. Moreover, the figures of settlement and pore pressure results in the different basic period are drawn, and the corresponding analysis conclusions are obtained based on the comparison among the results from the computational parameters of depth. In addition,, the influence rules of various parameters on settlement results is concluded through running the parameter sensitivity analysis in Soft-Soil-Creep Model, and the experience and conclusions can be for reference in the design and con-struction of similar large-scale marine reclamation land project. Also the empirical value method of the creep index has not been applied widely. Further research needs to be done.
Źródło:
Polish Maritime Research; 2015, S 1; 35-42
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Deformation of the Earth’s surface by local mass loading and uploading effects
Autorzy:
Mojzeš, M.
Kollar, P
Valko, M.
Powiązania:
https://bibliotekanauki.pl/articles/225088.pdf
Data publikacji:
2012
Wydawca:
Politechnika Warszawska. Wydział Geodezji i Kartografii
Tematy:
mass loading
compressibility of soil
elastic settlement of Earth's surface
masa załadunku
ściśliwość gruntu
elastyczne rozliczenie powierzchni Ziemi
Opis:
The mass of a building influences a deformation of the Earth’s surface up to long distance from area of realization. The elastic and rheological effects of settlement are modeled by different methods presented in the many scientific papers. More deeply knowledge of mechanical properties of materials and modern computer equipment allow construct very precisely model reaction of the Earth surface on loading effects in time. Geodesists and geophysicists need to know this laws of deformation and theirs time evolution for design of control geodetic networks and for analysis of repeated control measurements of horizontal and vertical time series. The presentation contents the mathematical modeling of the Earth elastic surface deformation caused by loading and unloading effects caused by a mass.
Źródło:
Reports on Geodesy; 2012, z. 1/92; 191-200
0867-3179
Pojawia się w:
Reports on Geodesy
Dostawca treści:
Biblioteka Nauki
Artykuł
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