Wyniki wyszukiwania - Biblioteka Nauki

1

Ocena stanu technicznego skarpy przy elektrowni wodnej Dychów po jej odbudowie

100%

Zajbert A.

Gospodarka Wodna

|

2000

|

tom Nr 1

17-24

PL

Przedstawiono zakres robót naprawczych i zabezpieczających wykonywanych po awarii skarpy i zastosowaną aparaturę kontrolno-pomiarową. Podano zalecenia co do uzupełniających badań i zabiegów technicznych.

EN

The paper presents the scope of repair and protective works carried out after the break-down of the slope as well as the applied control apparatus. It presents also results of the analysis of the stability of the slope and recommendations concerning supplemantary examin-ations and technical measures.

2

Analysis of Riverbank Stability Due to Bamboo Vegetation in Walanae River, South Sulawesi, Indonesia

100%

Pertiwi N. , Rauf B. A. , Lullulangi M.

Journal of Ecological Engineering

|

2021

|

tom Vol. 22, nr 9

176--184

EN

Bamboo vegetation is an endemic plant in Indonesia that grows on riverbanks. These plants have the potential to increase shear resistance due to the bond between the roots to the soil. However, an increase in plant weight due to its growth causes additional loads of soil. The condition triggers the release of soil on the slopes and causes riverbank sliding. Therefore, in developing the riparian ecological function, it is necessary to maintain the plants without neglecting the risk of physical damage to the river. This study aimed to estimate the risk of riverbank sliding due to the presence of bamboo plants by utilizing the bamboo vegetation conditions on the Walanae River. It was carried out on the 42.4 km riverbank in the middle area of Walanae watershed. The researchers selected 46 clumps of parring bamboo (Gigantochloa atter) as an endemic bamboo in this area and growing in the riverbank. The diameter of the bamboo trunk is the basis for an estimate of the weight of the bamboo clump. Furthermore, a numerical analysis was carried out by taking into account the load and shear resistance on the slope, including the weight of the plant. The research results indicated that bamboo is feasible to be applied for riverbank protection using the soil bioengineering method. The bamboo weight, which is indicated by the number of poles and diameter, significantly affects the stability of the slope. Therefore, the prevention of rising weight by harvesting method is critical to consider in riverbank protection.

3

Odbudowa i modernizacja skarpy przy elektrowni szczytowo-pompowej w Dychowie po jej awarii w 1997 r.

100%

Lewandowski R.

Gospodarka Wodna

|

2001

|

tom Nr 9

378-383

PL

Przedstawiono najważniejsze przedsięwzięcia, jakie zostały podjęte w celu usunięcia skutków awarii skarpy i stworzenia możliwości późniejszej, bezpiecznej eksploatacji elektrowni szczytowo-pompowej w Dychowie.

EN

There have been presented the most important undertakings to eliminate the effect of the break-down of the slope at the hydroelectric power plant Dychow and to create possibility for safe exploitation of that plant.

4

The analysis of the usefulness of welded meshes to embankment reinforcement

100%

Ćwirko M. , Jastrzębska M. , Kwiecień S.

Studia Geotechnica et Mechanica

|

2017

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tom Vol. 39, nr 3

3--9

EN

The aim of this paper was to find an answer to the question about the possibility of using steel welded mesh in building the retaining walls of gabion baskets. In light of the currently used gabion structure solutions, among which double-woven mesh is much more popular, the focus was put on the possibility of using welded mesh. A numerical analysis was conducted to examine the behavior of welded and woven mesh subjected to various loads and the results obtained for both types of mesh were directly compared. The maximal displacement in mesh nodes was admitted as the measurement of the system behavior (in the case of both undamaged and damaged mesh).

5

Baltic herring (Clupea harengus membras) spawning grounds on the Lithuanian coast: current status and shaping factors

100%

Šaškov A. , Šiaulys A. , Bučas M. , Daunys D.

Oceanologia

|

2014

|

tom No. 56 (4)

789--804

EN

During the 2009 and 2010 seasons Baltic herring (Clupea harengus membras L.) spawning grounds were investigated by SCUBA divers off the Lithuanian Baltic Sea coast. The most important spawning substrate was a hard bottom overgrown with red algae Furcellaria lumbricalis, but only 32.8% of potentially suitable spawning locations had herring eggs. Bottom geomorphological analysis using multibeam bathymetry revealed that the distribution of spawning beds is not random, but is determined rather by small-scale geomorphological features. The majority of the detected spawning locations were on local elevations characterised by 2.4±1.1 m depth differences and 4.8±1.8 slopes.

6

On regularity estimates for mappings between embedded manifolds

100%

Ioffe A.

Control and Cybernetics

|

2007

|

tom Vol. 36, no 3

659-668

EN

We describe a class of metric spaces such that for set-valued mappings into such spaces it is possible to give a precise expression of regularity moduli in terms of slopes of DeGiorgi-Marino-Tosques. We also show that smooth manifolds in Banach spaces endowed with the induced metric belong to this class.

7

Improving the plane‑wave destruction method by parameterizing the local slope for VSP wavefield separation

100%

Guo Y. , Peng S. , Du W. , Li D. , Li C.

Acta Geophysica

|

2023

|

tom Vol. 71, no. 4

1659--1673

EN

High-precision seismic exploration has attracted a great deal of attention. Vertical seismic profiles have the advantages of high exploration accuracy and ideal imaging effects, making them an effective tool for mine exploration. The separation of upgoing and downgoing waves is a vital step in vertical seismic profile processing. However, wavefield separation processing in the frequency–wavenumber domain often leads to aliasing in the time–distance domain. In addition, it is likely to result in incomplete wavefield separation in the sparse domain because of inaccurate threshold selection. As an effective time–distance domain wavefield separation method, the plane-wave destruction method can effectively avoid these problems. However, the traditional local slope estimation in plane-wave destruction is data-driven, making it difficult to distinguish linear upgoing and downgoing waves. Therefore, the velocity-based local slope parameterization method is proposed to construct a plane-wave destruction filter that can be used to separate the vertical seismic profile wavefield. Synthetic and field data show that the proposed separating strategy has higher separation accuracy than traditional methods when separating the upgoing and downgoing waves of vertical seismic profile data.

8

Ocena stateczności skarp małych budowli ziemnych

100%

Osiński P.

Inżynieria Morska i Geotechnika

|

2012

|

tom nr 4

478-483

PL

W artykule przedstawiono wyniki prac podjętych w celu stworzenia wytycznych służących ocenie stanu bezpieczeństwa skarp. W wyniku podjętych prac badawczych i obliczeniowych opracowano zestawy tabel i grafów przedstawiających zależność współczynnika stateczności od wybranych 6 parametrów skarpy: wysokość i nachylenie, wpływ okrywy roślinnej, przyłożenie dodatkowego obciążenia, warunki geotechniczne i wpływ wody. Zaletą wytycznych jest prostota ich użytkowania, gdyż ocena stateczności nie wymaga dodatkowych obliczeń.

EN

The article presents the results of the research conducted in order to create guidelines allowing assessment of slope stability. The guidelines involve graphs and charts, where factor of safety is computed in according to six different characteristics: slope height and angle, slope surface vegetation cover, surcharge applied, position of water table, soil condition. The advantage of the guidelines is the simplicity of use, as further FOS calculations are not required.

9

Vector algebra for Steep Slope Model analysis

88%

Kolecka N.

Landform Analysis

|

2012

|

tom Vol. 21

17-25

EN

Geographic Information Systems offer many algorithms that allow analysis of digital elevation models. They work with both GRID and TIN data, but they are limited to 2.5D models, where one planar (X,Y) position refers to only one vertical (Z) value. In mountainous regions, however, many steep, vertical and even overhung parts of rock walls and slopes occur. GRID and TIN models in a standard projection are not capable to deal with such a relief as they are not able to capture all complexity of steep slopes that can be observed from the terrestrial perspective. Such a perspective can be introduced into GIS via computer graphics software that allows 3D surface modelling by means of mesh, e.g. 3D triangular network. The paper presents a concept that implements 3D mesh in GIS and utilizes vector algebra to analyze such a surface. The idea is based on using normal vectors to compute slope and aspect of each triangle in a mesh. The computed values are saved as their attributes. Complete procedures are written in Python programming language and implemented into popular GIS software to work as a plug-in tool.

10

Constraints on the precision of SAR in equivalent dose estimations close to saturation in quartz

88%

Athanassas C.

Geochronometria

|

2011

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tom Vol. 38, no. 4

413-423

EN

Difficulties in evaluating accurate equivalent doses for Late Quaternary sediments from the south coasts of Greece arose in the course of SAR measurements. Large scatter among apparent equivalent doses perplexed the evaluation of accurate mean estimates in circumstances where very large doses were involved. Besides, dose recovery experiments revealed that when intersection of the natural signal occurs onto the saturating segment of the growth curve, a distinct relationship between De and growth curve shape occurs. At very low slope angles, SAR tends to overestimate the recov-ered dose. The mechanism which controls the spread in equivalent dose estimation is investigated.

11

A systematic review of clay shale research development for slope construction

88%

Fitri S. N. , Surjandari N. S. , As’ad S.

Przegląd Naukowy Inżynieria i Kształtowanie Środowiska

|

2023

|

tom Vol. 32, No. 4

357--375

EN

The issue of stability controlling cutting slopes is particularly important in clay-shale slopes, a typical expanding sedimentary layer with poor engineering geological conditions and mechanical characteristics. Therefore, research on the causes of failure and remedies for clay-shale cutting slopes is required to serve as an overview for handling and preserving clay-shale slopes in identical conditions. However, the trusted information about the need for further related clay shale research and clay shale in slope stability has yet to be specifically presented. This review study summarizes the published research for clay shale beginning in 1980, presents a bibliometric analysis to examine the published research based on year and country, and provides various study trends in cluster diagram using the VOSviewer program. The analysis also summarized some key goals, effective methodology, and significant findings from the most recent studies to extract information from them that would benefit future research. In conclusion, the results show the need for developing research to fill the knowledge gap regarding clay shale, landslide, and clay mineralogy. In addition, the clay shale slope analysis has revealed the need for additional research into dynamic force and its deformation.

12

Experimental bearing capacity of eccentrically loaded foundation near a slope

88%

Mansouri T. , Abbeche K.

Studia Geotechnica et Mechanica

|

2019

|

tom Vol. 41, nr 1

33-41

EN

Based on the response of small-scale model square footing, the present paper shows the results of an experimental bearing capacity of eccentrically loaded square footing, near a slope sand bed. To reach this aim, a steel model square footing of (150 mm × 150 mm) and a varied sand relative density of 30%, 50% and 70% are used. The bearing capacity-settlement relationship of footing located at the edge of a slope and the effect of various parameters such as eccentricity (e) and dimensions report (b/B) were studied. Test results indicate that ultimate bearing capacity decreases with increasing load eccentricity to the core boundary of footing and that as far as the footing is distant from the crest, the bearing capacity increases. Furthermore, the results also prove that there is a clear proportional relation between relative densities –bearing capacity. The model test provides qualitative information on parameters influencing the bearing capacity of square footing. These tests can be used to check the bearing capacity estimated by the conventional methods.

13

EUSS – computer model to evaluate emission uniformity for sloping surfaces under drip irrigation system

88%

Abo Zied W. , Hanafy M. , Mostafa E. , Abo Habssa A.

Journal of Water and Land Development

|

2021

|

tom no. 48

1--10

EN

A computer model EUSS (Emission Uniformity on Sloping Surfaces) has been developed to design and evaluate the system capacity under operating conditions for drip irrigation system. And achieve the desired value of emission uniformity that is not significantly different according to the recommended values by applying it in field experiment located at Al-Slahia city, Egypt. The model has the ability to design the system by all of the common design techniques and have ability to customize any of them. EUSS model includes two main parts: crop water requirements, and hydraulic calculations of the system using metric unit system. It developed in graphical user interface of the programming language C-sharp (C#) by using Microsoft Visual Studio. The model database is containing the equations, tables and reference values to get more rapid and accurate results, and gives the opportunity for selecting some parameters such as: soil properties, characteristics of the corresponding crop, and climatic data. EUSS model allows the user to assume or set definite values, for example plot layout, land slopes and topography, the emitter characteristics and operating conditions.

14

Deux types de versants periglaciaires de haute Belgique

88%

Pissart A.

Quaestiones Geographicae. Zeszyt Specjalny

|

1995

|

tom 04

15

Mechanika elastycznych wypełnień dylatacji w okładzinach betonowych skarp kanałów i nasypów hydrotechnicznych

75%

Kledyński Z. , Krysiak Ł.

Gospodarka Wodna

|

2021

|

tom Nr 2

25--31

PL

W referacie przedstawiono rozważania teoretyczne dotyczące mechanicznej pracy elastycznych materiałów wypełniających przerwy dylatacyjne, na przykładzie spoin między płytami betonowymi na skarpie budowli hydrotechnicznej. Wśród czynników wpływających na wartości odkształceń wypełnień uwzględniono roczne wahania temperatury budowli, jej wartość w momencie aplikacji wypełnienia, szerokość uszczelnianej przerwy dylatacyjnej oraz rozmiary oddzielonych sekcji. Wyróżniono dwa sposoby zniszczenia wypełnienia - przez utratę kohezji wewnątrz materiału lub przyczepności do ściany dylatacji. Występowanie danego wariantu powiązano z właściwościami materiału wypełnienia oraz geometrią spoiny. Przedstawiona analiza może dostarczać wskazówek do odpowiedniego projektowania oraz wykonawstwa dylatacji, łącznie z doborem materiału do ich wypełnienia.

EN

The paper presents a brief theoretical analysis of the mechanics of elastic sealants inside expansion joints, presented on the example of gaps between concrete face slab sections covering a slope of a water engineering structure. The analysed factors influencing the strain of such material are the yearly variation of structure’s temperature, its value during the application of sealant, the width of the joint as well as the size of separated sections. Two modes of destruction of the sealant are discussed - by loss of cohesion in the material or loss of adhesion to the sides of the joint. The occurrence of a given mode is related to the properties of the sealant material and the geometry of the joint. The analysis presented in the paper might assist in proper design and execution of expansion joints, as well as selection of an appropriate sealant material.

16

Profilaktyka erozyjna skarp ziemnych i dróg transportowych na przykładzie składowiska odpadów flotacyjnych "Żelazny Most"

75%

Kłeczek Z.

Karbo

|

2002

|

tom Nr 7

216-219

PL

Kluczową rolę w ciągu technologicznym zakładów wydobywczo-prze-twórczych KGHM Polska Miedź SA spełnia składowisko odpadów flotacyjnych i wód dołowych „Żelazny Most". O ile w aktualnej sytuacji zadania technologiczne tego obiektu hydrotechnicznego są realizowane bez większych problemów, o tyle w pewnych okresach pojawia się zagrożenie utraty stateczności dróg transportowych i skarp ziemnych składowiska, wywołane zarówno erozją wodną, jak i erozją eolicz-ną. W wyniku przeprowadzonych studiów i prac badawczych zainstalowano w newralgicznych sekcjach składowiska komórkowy system ograniczający typu GEOKRATA, który zdał egzamin w warunkach intensywnych opadów atmosferycznych i procesów eolicznych.

EN

The key role in the mining and ore processing circuit of KGHM Polska Miedź SA plays the tailings and mine water impoundment - „Żelazny Most". If at present the technological tasks of this facility are executed without bigger problems, in some periods arises the hazard of stability loss of the transport roads and earth slopes of the pond, what is caused by water and eolian erosion. According to the studies and research works, in crucial sections of the impoundment, special cellular limiting system GEOKRATA was placed, which turned to be useful during heavy rainfalls and eolian processes.

17

Bezpieczne skarpy i zbocza

75%

Kania M. M.

Geoinżynieria : drogi, mosty, tunele

|

2013

|

tom nr 1

28-33

EN

The basis for any action to improve stability conditions is well done recognition of the geotechnical ground in the area of the escarpment or hill. Currently available research methods, computational programs and other technics of various treatments improving stability create conditions for safe design excavations and the escarpments, and with the appropriate involvement – as well as natural slopes. The stability the ground in areas without seismic activity mainly depend on the conditions climate and on human activities. In Poland there are landslides almost exclusively in areas with sloping surface - natural or shaped by different building activity.

18

Pomiar rezystancji uziemień rozległych metodą nachylenia zbocza

75%

Domański R.

Elektro Info

|

2020

|

tom nr 9

89--91

PL

W artykule przedstawiona zostanie metoda nachylenia zbocza. Stanowi ona punkt wyjścia do wyprowadzenia powyższego wzoru. Umożliwia badania rozległych uziemień i ocenę poprawności otrzymanych wyników. Różnica polega na przeprowadzeniu trzech pomiarów w celu ustalenia pozycji elektrody napięciowej i fizycznego przeprowadzenia właściwego pomiaru, a nie tylko ograniczania się do wyliczenia jej wartości ze wzoru.

19

Effect of slope in an immersive virtual environment on segmental asymmetry in people with femoral amputation and a microprocessor knee

75%

Pantera E. , Denys V. , Pradon D.

Acta of Bioengineering and Biomechanics

|

2023

|

tom Vol. 25, no. 3

EN

The continued development of microprocessor-based knee prostheses has improved the independence of people with a femoral amputation in many environments. This study aimed to describe the effect of slopes on kinematic joint variables and segmental asymmetry.

20

EUSS – computer model to evaluate emission uniformity for sloping surfaces under drip irrigation system

75%

Abo Zied W. , Hanafy M. , Mostafa E. , Abo Habssa A. , Abo Zied W. , Hanafy M. , Mostafa E. , Abo Habssa A.

|

nr 48