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7112. Geologische Skizzen aus der Umgebung Aussigs: eine Anleitung zur selbständigen Naturbeobachtung
- Creator:
- Bruder, Georg
- Publisher:
- Ad. Becker's Buchhandlung and Rudolf Becker)
- Format:
- print and 65 s., [14] l. obr. příl. : il. ; 24 cm
- Type:
- Text, monografie, studie, volume, model:monograph, and TEXT
- Subject:
- geologie, geologie--Česko, regionální geologie, regionální geologie--Česko, geomorfologie, geomorfologie--Česko, geologické poměry, geologické poměry--Ústí nad Labem (Česko : oblast), 55, 551.1/.4, and 551.4
- Language:
- German
- Description:
- von Georg Bruder and Obsahuje bibliografii a bibliografické odkazy
- Rights:
- http://creativecommons.org/publicdomain/mark/1.0/ and policy:public
7113. Geomechanical effects of operation and closing the Idrija Mercury Mine on the environment
- Creator:
- Likar, Jakob
- Format:
- print, bez média, and svazek
- Type:
- article, články, model:article, and TEXT
- Subject:
- Geologie. Meteorologie. Klimatologie, doly, mines, Mercury Mine, cross-stope mining method, backfilling, sublevel mining method with consolidated backfill, low bearing capacity rock structure, geotechnical measurement, 7, and 551
- Language:
- English
- Description:
- The past five centuries of the Idrija Mercury Mine’s operation have had consequences on the environment, which have directly influenced the deformations developing in the wider exploration area. During the many years of mercury ore exploitation, the cross-stope mining method with backfilling from bottom to top was used. This has strongly transformed the stress-strain field in the surrounding rocks and caused long-term deformation processes that are still in progress. This is because the deformations have a small time gradient and thus bigger breaks or faster sliding terrain above old mine workings are not expected. The surface movements are bigger in the area built of Permian-Carboniferous, low-bearing-capacity rocks, which in the past was destroyed by major tectonic movements in the rock structure. Mine closure works, which included grouting and hardening of destroyed underground areas, as well as filling parts of the mine and backfilling empty spaces (i.e., mine roadways, blind shafts), are finished. The efficiency of mine shutdown works is constantly being verified by means of geotechnical and other measurements and observations, and will continue in the future., Jakob Likar., and Obsahuje bibliografii
- Rights:
- http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public
7114. Geomechanical modeling of subsidence related strains causing earth fissures
- Creator:
- Malinowska, Agnieszka A, Misa, Rafał, and Tajduś, Krzysztof
- Format:
- print, bez média, and svazek
- Type:
- model:article and TEXT
- Subject:
- geodynamika, geomechanika, geofyzika, geologie, těžba uhlí, geodynamics, coal mining, geophysics, geology, geomechanics, geomechanical modelling, horizontal stress, subsidence, earth fissures, 7, and 551
- Language:
- English
- Description:
- The research is focused on the feasibility analysis of a numerical model describing the field of strains generated by mining-induced subsidence caused by a deep underground coal extraction, which may contribute to the formation of Earth fissures. The finite elements method and Knothe’s theory were used in the research. The geomechanical modeling was applied for defining zones of strains and maximum horizontal deformations of the terrain. Knothe’s theory was employed for defining boundary conditions of the geomechanical model. The parameters of the empirical and geomechanical models were scaled out on the basis of geodetic surveys in the mining area. The results of geomechanical modeling were compared with the geodetic surveys to select the best model. The presented research confirmed high congruence between the results of modeling with the finite elements method and observations of vertical movements on the surface. The results of modeling also confirmed the assumed highest stress in areas where earth fissures were observed. The proposed solution may be a new research tool applicable to areas where earth fissures potentially occur. and Malinowska Agnieszka A., Misa Rafał, Tajduś Krzysztof.
- Rights:
- http://creativecommons.org/publicdomain/mark/1.0/ and policy:public
7115. Geomechanical parametres of the Podlesí granites and their relationship to seismic velocities
- Creator:
- Nováková, Lucie, Sosna, Karel, Brož, Milan, Najser, Jan, and Novák, Petr
- Format:
- print, bez média, and svazek
- Type:
- article, články, model:article, and TEXT
- Subject:
- Geologie. Meteorologie. Klimatologie, žuly, pórovitost, granites, porosity, Poisson’s ratio, seismic waves, Young’s modulus, shear modulus, 7, and 551
- Language:
- English
- Description:
- We studied the geophysical, physical, and geomechanical parameters of the Podlesí granites in the western part of the Krušné hory Mts., near the village of Potůčky. The granites represent a fractionated intrusion within the Nejdecký Massif. In total, the studied borehole is about 300 m deep. The samples were collected at depths of between 35 and 105 metres. Seismic P-wave and S-wave velocities were measured using ultrasonic scanning. The samples were water-saturated, unsaturated, and dried. The ultrasonic scanning system consisted of four piezoelectric sensors and a digital oscilloscope recorder. The wave frequency was 1 MHz. P-wave velocities range from 4400 m.s-1 to 6500 m.s-1 while S-wave velocities range from 2800 m.s-1 to 3800 m.s-1. These data were used to calculate dynamic Young’s modulus, dynamic shear modulus, and Poisson’s ratio. The deformational characteristics of the rock were specified from experimental loading of the sample with uniaxial strain. The shear and longitudinal deformation of each sample was measured using a resistive strain gauge fixed directly on the sample. Intermittent loading of the samples proceeded using a uniform gradient of axial stress of 1 MPa.s-1. The samples were subjected to five separate loads. During the tests, following parameters were recorded: stress, longitudinal deformation, and shear deformation. These data were used to calculate static Young’s and shear modulus, and Poisson’s ratio., Lucie Nováková, Karel Sosna, Milan Brož, Jan Najser and Petr Novák., and Obsahuje bibliografii
- Rights:
- http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public
7116. Geometria pro vyšší gymnasia
- Creator:
- Václav Jandečka
- Publisher:
- V. Jandečka
- Format:
- print, text, regular print, and 142 s. : il. ; 22 cm
- Type:
- model:monograph and TEXT
- Subject:
- Geometrie, Učební osnovy. Vyučovací předměty. Učebnice, geometrie, analytická geometrie, 514, 514.12, (075.3), 13, 22, and 37.016
- Language:
- Czech
- Description:
- Díl čtvrtý, Analytická geometria v rovině, and od Václava Jandečky
- Rights:
- http://creativecommons.org/publicdomain/mark/1.0/ and policy:public
7117. Geometria pro vyšší gymnasia
- Creator:
- Václav Jandečka
- Publisher:
- V. Jandečka
- Format:
- print, text, regular print, and 127 s. : il. ; 22 cm
- Type:
- model:monograph and TEXT
- Subject:
- Geometrie, Učební osnovy. Vyučovací předměty. Učebnice, geometrie, planimetrie, 514, 514.112, (075.3), 13, 22, and 37.016
- Language:
- Czech
- Description:
- Díl prvý, Planimetria, and od Václava Jandečky
- Rights:
- http://creativecommons.org/publicdomain/mark/1.0/ and policy:public
7118. Geometria pro vyšší gymnasia
- Creator:
- Václav Jandečka
- Publisher:
- I.L. Kober
- Format:
- print, text, regular print, and 66 s. : il. ; 22 cm
- Type:
- model:monograph and TEXT
- Subject:
- Geometrie, Učební osnovy. Vyučovací předměty. Učebnice, geometrie, trigonometrie, 514, 514.116, (075.3), 13, 22, and 37.016
- Language:
- Czech
- Description:
- Díl třetí, Trigonometria, and sepsal Václav Jandečka
- Rights:
- http://creativecommons.org/publicdomain/mark/1.0/ and policy:public
7119. Geometria pro vyšší gymnasia
- Creator:
- Václav Jandečka
- Publisher:
- I.L. Kober
- Format:
- print, text, regular print, and 131 s. : il. ; 22 cm
- Type:
- model:monograph and TEXT
- Subject:
- Geometrie, Učební osnovy. Vyučovací předměty. Učebnice, geometrie, planimetrie, 514, 514.112, (075.3), 13, 22, and 37.016
- Language:
- Czech
- Description:
- Díl prvý, Planimetria, and od Vácslava Jandečky
- Rights:
- http://creativecommons.org/publicdomain/mark/1.0/ and policy:public
7120. Geometric and combinatorial structure of a class of spherical folding tessellations. I
- Creator:
- Avelino, Catarina P. and Santos, Altino F
- Format:
- print, bez média, and svazek
- Type:
- model:article and TEXT
- Subject:
- matematika, trigonometrie, mathematics, trigonometry, dihedral f-tiling, combinatorial propertie, spherical trigonometry, symmetry group, 13, and 51
- Language:
- English
- Description:
- A classification of dihedral folding tessellations of the sphere whose prototiles are a kite and an equilateral or isosceles triangle was obtained in recent four papers by Avelino and Santos (2012, 2013, 2014 and 2015). In this paper we extend this classification, presenting all dihedral folding tessellations of the sphere by kites and scalene triangles in which the shorter side of the kite is equal to the longest side of the triangle. Within two possible cases of adjacency, only one will be addressed. The combinatorial structure of each tiling is also analysed., Catarina P. Avelino, Altino F. Santos., and Obsahuje bibliografii
- Rights:
- http://creativecommons.org/publicdomain/mark/1.0/ and policy:public