Combination of numerical models of deformations and repeated geodetic measurement results provide reliable information on the state of the rock mass in a mining area and support planning and control of the mining operation. The paper describes the concept of integrated monitoring and analysis of rock mass deformation in the Kvannevann iron ore mine (Norway) using sub-level caving (SLC) method. Geodetic control network developed for periodic measurements of surface subsidence and a source of geometrical data for numerical modelling of deformations using finite element method (FEM) has been characterised. Focus is given to the results of initial numeric al analyses with FEM of rock mass deformations due to SLC mining. The results of the modelling provided information on possible extent of deformation zones on the mining ground surface once mining with new method commences., Jan Blachowski and Steinar Ellefmo., and Obsahuje bibliografické odkazy
Authors compared bird communities living in five mountain areas in the northern Croatia (Risnjak, Papuk, Medvednica, Ivanščica and Cesargrad mountain) using multivariate explorative techniques of qualitative and quantitative historical data. Similarity matrices were prepared based on Bray-Courtis similarity among samples. Non-metric multidimensional scaling (NMDS) and complete linkage clustering on qualitative and quantitative similarity matrix respectively were made. Principal component analysis (PCA) on quantitative data revealed bird species that contributed the most to the variability of samples. First three dimensions explain 75.2% of variance in samples (53.1%, 13.5% and 8.6% respectively) while the greatest loadings are caused by abundant species like Sylvia atricapilla, Erithacus rubecula, Turdus merula and Phylloscopus collybita. Non-metric multidimensional scaling revealed clear pattern in significant similarity among communities at low altitudes and at the same time – insignificant similarity among assemblages at different altitudes above the sea level (exception from the rule applies to the Papuk community at 600 m.a.s.l.). The clustering based on similarity matrix on qualitative data has shown clear separation among communities from different mountain areas. This study suggests that monitoring bird communities in the Croatian mountains must be designed as repeated sampling of quantitative data through time.
Three year monitoring of micro-displacements on four tectonic fracture planes in a tunnel driven by a milling cutter into granitoids of Bohemian Massif revealed micro-movements that develop in certain trends and impulses. Two investigated fractures are of the Krušné Hory Mts. orientation (NE - SW), other two of Sudeten orientation (NW - SE). These have been found the two prevailing fracture orientations in the massif. Results from all the four fractures indicate trends in overfaulting of southern blocks over the northern ones and a stress state model characteristic of approximate N-S compression with overthrust vergence to N. Besides, some impulses were indicated with abrupt occurrence that dominates the development of movements. The first most significant impulse occurred by the end of the year 2004, the second one at the break of 2005/6. The coincidence of the impulses with earthquake events is discussed., Josef Stemberk and Blahoslav Košťák., and Obsahuje bibliografii
The Čierny Hron River basin is left tributary of the Hron River basin, high wooded, only little influenced by anthropogenic activity. For these reasons in 1980 representative basin of the Slovak Hydrometeorological Institute (SHMI) was established there. In the developing tasks of the SHMI and during International Hydrological Decade research of runoff creation and evolution with dependent of natural conditions according Program of the representative river basin (Podolinský, Šipikalová, 1994) were implemented. The Slovak Hydrometeorological Institute operates there extended monitoring network of the water-gauging and rainfall stations with monitoring and evaluation of observed elements till now. Monitored data and results from expeditionary measurements are continuously used for new methodologies, processes, runoff modeling of hydrological characteristics evaluation and discharge forecast. In the paper we have described all activities of the representative basin during its history. and Čierny Hron je ľavostranným prítokom Hrona s vysokým percentom zalesnenia, s takmer nenarušeným režimom odtoku. V rámci rozvojových úloh ústavu a Medzinárodnej hydrologickej dekády bol uskutočňovaný výskum tvorby a vývoja odtoku v závislosti od prírodných podmienok podľa Programu reprezentatívneho povodia (Podolinský, Šipikalová, 1994) a v roku 1980 bolo začlenené medzi reprezentatívne povodia Slovenského hydrometeorologického ústavu (SHMÚ). Z toho dôvodu má Slovenský hydrometeorologický ústav v povodí rozšírenú sieť vodomerných a zrážkomerných staníc, v ktorých sa sledujú a vyhodnocujú pozorované prvky. Vyhodnotené údaje z monitorovacích staníc, doplnené o expedičné merania sa priebežne využívajú na vypracovanie nových metodík, postupov, modelovanie odtoku a predpoveď prietokov. V príspevku sme sa snažili zhrnúť všetky aktivity a úlohy, ktoré sa zaoberali reprezentatívnym povodím počas jeho existencie.
Vegetation succession was studied for 12 years on an abandoned nutrient-poor small field surrounded by a strip of natural grassland. No fertilizers or herbicides were applied. Few weeds or annuals were present during this period. Only two plants, i.e. Agrostis capillaris and Festuca rubra, dominated during the 12 years. At two spatial scales (0.04 and 0.4 m2 ) a dramatic increase in species richness was recorded during the first two years. However, no further trend in species richness occurred after the sixth year of succession. Successional changes were directed and continuous. The rate of succession depended on the distance from the neighbouring meadow. Vegetation at the margins of the transect developed more slowly and diverged from the middle during the succession.
A convolution sum discrete process neural network (CSDPNN) is proposed. CSDPNN utilizes discrete samples as inputs directly and employs convolution sum to simulate the process inputs so as to deal with the time accumulation existing in many time series. Without the procedures of fitting the discrete samples into continuous functions to generate inputs and then to expand the input functions by basis functions, CSDPNN is better understandable and is with less precision reduction compared with process neural network (PNN) with function inputs. The approximation capacity of CSDPNN is analyzed in this paper, and it proved that CSDPNN can approximate PNN and has approximation capacity not worse than traditional artificial neural network (ANN). Finally, CSDPNN, PNN and ANN are utilized to predict the Logistic chaos time series and the iron concentration in the lubrication oil of aircraft engine, and the application test results indicate that CSDPNN performs better than PNN and ANN given the same conditions.
Modern methods of monitoring landslides are based on observations of both: direct surveying (GNSS, electronic tachymetry, geometric levelling) and remote sensing (terrestrial and aerial photogrammetry, laser scanning, interferometry), as well as surface and subsurface geotechnical observations (e.g. inclinometers, extensometers, piezometers, etc.). Due to the high cost of installation of these devices and its measurement, the implementations of these methods are usually used on well-define d objects, with established landslide activity and high risk to people’s lives. The main objective of the project was to design, create and do practical tests of simple and inexpensive measurement devices, which detect first symptoms of a potential landslide movements and alert of an existing threat. These devices would be some kind of an early warning system that would register the occurrence of the first movements of the surface layers of soil, which would be a signal to start of geodetic and geotechnical monitoring of potential landslides., Bartłomiej Ćmielewski, Bernard Kontny and Kazimierz Ćmielewski., and Obsahuje bibliografické odkazy
Social wasps are often considered as nuisance pests in urban environments and are often controlled by using traps. The majority of commercially produced traps for catching wasps have yellow as the dominant colour around the trap entrance. However, the observations on the function of yellow as an attractant for wasps are controversial. The efficiency of yellow, compared with green striped (N = 15) and yellow and green striped beer traps (N = 15) was evaluated. According to the results, yellow does not have a specific role as an attractant for wasps of the genera Vespula Linnaeus and Dolichovespula (Rohwer). For wasps, it may be the bait that is the major lure and it might be sufficient on its own for both control and monitoring purposes.