نتایج جستجو برای: abandoned field
تعداد نتایج: 795017 فیلتر نتایج به سال:
in this thesis our aim is to construct vector field in r3 for which the corresponding one-dimensional maps have certain discontinuities. two kinds of vector fields are considered, the first the lorenz vector field, and the second originally introced here. the latter have chaotic behavior and motivate a class of one-parameter families of maps which have positive lyapunov exponents for an open in...
The influence of the ventilation system on the abandoned gob weakens, so the gas seepage characteristics in the abandoned gob are significantly different from those in a normal mining gob. In connection with this, this study physically simulated the movement of overlying rock strata. A spatial distribution function for gob permeability was derived. A numerical model using FLUENT for abandoned g...
Although soil invertebrates play a decisive role in maintaining ecosystem functioning, little is known about their structural composition in Alpine soils and how their abundances are affected by the currently ongoing land-use changes. In this study, we re-assessed the soil macrofauna community structure of managed and abandoned Alpine pastureland, which has already been evaluated 14 years earli...
BACKGROUND The importance of soil biota in the composition of mature plant communities is commonly acknowledged. In contrast, the role of soil biota in the early establishment of new plant communities and their relative importance for soil abiotic conditions are still poorly understood. AIMS AND METHODS The aim of this study was to understand the effects of soil origin and soil fungal communi...
In 2 non-governmental organization projects in Bangladesh 244 new leprosy patients were classified in the field according to clinical criteria. Skin smears were taken at 4 standardized sites and at the most active peripheral lesion, where a biopsy was also taken. Comparison of the clinical field classification with the results of the skin smears and biopsies gives a sensitivity of 92.1% for the...
The concepts of slow environmental change through evolutionary processes associated with ordinary artefacts from Central European rural life as part biogeographical morphology was studied in Gori?ko Landscape Park, northeastern Slovenia. research based on field observations, including the recording a former aristocratic dwelling and two small farmsteads, all abandoned. An analysis extant residu...
An advanced break or a vast region of pressurisation may occur when the working face passes through an abandoned roadway, resulting in roof falling water inrush. The stress evolution passing roadway coal mine was comprehensively discussed using theoretical analysis, numerical simulation, and field monitoring. In this study, calculated critical width where main bound to 5.4 m. Reducing suspended...
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