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1.
UPORABA VZORCEV NA GRAFIKONIH S SVEČNIKI PRI TRGOVANJU S POGODBAMI ZA RAZLIKO
Michel Bordelius, magistrsko delo

Opis: Pri trgovanju z izvedenim finančnim instrumentom, pogodba za razliko ali CFD (angl. Contract For Difference), se trgovci poslužujejo različnih orodij tehnične analize trga vrednostnih papirjev. Zaradi narave CFD, ki so špekulativni finančni instrument s finančnim vzvodom (angl. leverage), je trgovanje z njimi smiselno v kratkoročnem časovnem obdobju (od nekaj ur do največ nekaj mesecev). Trgovec sklene s ponudnikom pogodbo za razliko, s katero se zaveže, da bo poravnal razliko med nakupno in prodajno ceno pogodbe. To stori z dobroimetjem na svojem trgovalnem računu. V primeru pozitivne razlike se dobroimetje na računu viša, v primeru negativnega izida za trgovca pa niža. Eden izmed najbolj privlačnih aspektov trgovanja s CFD je uporaba finančnega vzvoda. Potrebujemo le manjši depozit, s pomočjo katerega si izposodimo preostala sredstva, ki nam omogočajo pridobitev ekvivalentno večjega imetja. Pogodba za razliko za trgovanje izkoristi moč vzvoda, kar je tudi ključni razlog za privlačnost in uspešnost trgovanja. Sklenitev pogodbe CFD je financirana z jamstvom, kar pomeni, da investitor za vstop v pozicijo potrebuje le določen odstotek začetnega kritja, običajno med 1-30% od celotne vrednosti pozicije. Zaradi specifičnih značilnosti in velike preglednosti, ki jih japonski svečni grafikoni nudijo, je opazovanje določenih vzorcev, ki se na njih oblikujejo, ena izmed bolj priljubljenih tehnik pri iskanju kratkoročnih naložbenih priložnosti pri trgovanju s CFD. Poleg tega, da je vzorce, ki jih tvorijo, mogoče hitro in enostavno prepoznati, so grafikoni tudi vizualno privlačni. Trgovcem omogočajo vpogled v psihologijo vlagateljev: strah, pohlep in upanje, ki imajo velik kratkoročni vpliv na cene finančnih instrumentov. Svečni grafikoni nudijo več kot le metodo za prepoznavanje vzorcev. Z njihovo pomočjo lahko preberemo spremembe v interpretaciji vrednosti premoženja pri vlagateljih. Pokažejo nam interakcijo med kupci in prodajalci na način, kot ga trenutno ne omogoča nobena druga metoda grafikonov. Posamezne svečne vzorce, kateri v teoriji nastopajo bodisi kot bikovski bodisi kot medvedji, sem s pomočjo trgovalne platforme SaxoTrader 2, ki jo je razvila Danska banka, Saxo Bank, za zasebne vlagatelje-fizične osebe (angl. retail traders), poiskal v različno dolgih časovnih horizontih na štirih največjih svetovnih borzah in ugotavljal njihovo uporabno vrednost v praksi. Dokazal sem, da je večina vzorcev, ki jih teorija navaja kot vzorce obrata trenda ali nadaljevanja trenda, zanesljivih in da jih lahko uporabimo pri kratkoročnem trgovanju kot pomembne oporne točke.
Ključne besede: Ključne besede: pogodba za razliko, Contract for Difference (CFD), finančni vzvod (angl. leverage), japonski svečni grafikon, bikovski svečni vzorec, medvedji svečni vzorec, vzorec obrata trenda, vzorec nadaljevanja trenda
Objavljeno: 03.04.2012; Ogledov: 1491; Prenosov: 109
.pdf Celotno besedilo (5,10 MB)

2.
System for precise balancing and controlled unbalancing of fiber-optic interferometers
Irvin Sirotić, Denis Đonlagić, 2002, izvirni znanstveni članek

Opis: A system for accurate balancing and controlled unbalancing of the optical path difference in all-fiber optical interferometers is described. Interferometers with various arm lengths (1-30m) and with initial optical pathdifferences of as much as 1 cm have been successfully balanced within a 5 ▫$mu$▫m range. In addition, the proposed system allows for controlled unbalancing of arbitrary all-fiber optical interferometers with a precision better than 5 ▫$mu$▫m.
Ključne besede: electrical measurements, optical instruments, interferometers, fiber interferometers, optical path difference, sensor systems
Objavljeno: 01.06.2012; Ogledov: 612; Prenosov: 9
URL Celotno besedilo (0,00 KB)

3.
Difference-differential operators for basic adaptive discretizations and their central function systems
Lucia Birk, Sophia Roßkopf, Andreas Ruffing, 2012, izvirni znanstveni članek

Opis: The concept of inherited orthogonality is motivated and an optimality statement for it is derived. Basic adaptive discretizations are introduced. Various properties of difference operators which are directly related to basic adaptive discretizations are looked at. A Lie-algebraic concept for obtaining basic adaptive discretizations is explored. Some of the underlying moment problems of basic difference equations are investigated in greater detail.
Ključne besede: discretization, difference operator, Lie algebra, difference equations
Objavljeno: 26.06.2017; Ogledov: 63; Prenosov: 10
.pdf Celotno besedilo (408,24 KB)

4.
Oscillatory difference equations and moment problems
José M. Ferreira, Sandra Pinelas, Andreas Ruffing, 2014, izvirni znanstveni članek

Opis: In this paper, we first consider some new oscillatory results with respect to the discrete Hermite polynomials of type I, respectively, type II and the Heim-Lorek polynomials. In the second part, we investigate the oscillatory and boundedness properties of the related orthogonality measures and the functions representing them. The polynomials considered so far in this article are closely related to the concept of theWess-Ruffing discretization.
Ključne besede: difference equations, Hermite polynomials, polynomials, discretization
Objavljeno: 26.06.2017; Ogledov: 69; Prenosov: 10
.pdf Celotno besedilo (331,56 KB)

5.
Robust sex differences in jigsaw puzzle solving
Vid Kocijan, Marina Horvat, Gregor Majdič, 2017, izvirni znanstveni članek

Opis: Sex differences are consistently reported in different visuospatial tasks with men usually performing better in mental rotation tests while women are better on tests for memory of object locations. In the present study, we investigated sex differences in solving jigsaw puzzles in children. In total 22 boys and 24 girls were tested using custom build tablet application representing a jigsaw puzzle consisting of 25 pieces and featuring three different pictures. Girls outperformed boys in solving jigsaw puzzles regardless of the picture. Girls were faster than boys in solving the puzzle, made less incorrect moves with the pieces of the puzzle, and spent less time moving the pieces around the tablet. It appears that the strategy of solving the jigsaw puzzle was the main factor affecting differences in success, as girls tend to solve the puzzle more systematically while boys performed more trial and error attempts, thus having more incorrect moves with the puzzle pieces. Results of this study suggest a very robust sex difference in solving the jigsaw puzzle with girls outperforming boys by a large margin.
Ključne besede: children, sex difference, visuo-spatial tasks, jigsaw puzzle
Objavljeno: 13.11.2017; Ogledov: 75; Prenosov: 13
.pdf Celotno besedilo (1,57 MB)

6.
The use of the mesh free methods (radial basis functions) in the modeling of radionuclide migration and moving boundery value problems
Leopold Vrankar, Franc Runovc, Goran Turk, 2007, izvirni znanstveni članek

Opis: Recently, the mesh free methods (radial basis functions-RBFs) have emerged as a novel computing method in the scientific and engineering computing community. The numerical solution of partial differential equations (PDEs) has been usually obtained by finite difference methods (FDM), finite element methods (FEM) and boundary elements methods (BEM). These conventional numerical methods still have some drawbacks. For example, the construction of the mesh in two or more dimensions is a nontrivial problem. Solving PDEs using radial basis function (RBF) collocations is an attractive alternative to these traditional methods because no tedious mesh generation is required. We compare the mesh free method, which uses radial basis functions, with the traditional finite difference scheme and analytical solutions. We will present some examples of using RBFs in geostatistical analysis of radionuclide migration modeling. The advection-dispersion equation will be used in the Eulerian and Lagrangian forms. Stefan's or moving boundary value problems will also be presented. The position of the moving boundary will be simulated by the moving data centers method and level set method.
Ključne besede: mesh free methods, radial basis functions, finite difference methods, finite elemnt methods, boundary elements methods, geostatistics, Eulerian method, Lagrangian method, level set method
Objavljeno: 18.05.2018; Ogledov: 84; Prenosov: 0
.pdf Celotno besedilo (214,16 KB)

7.
An analysis of the geomechanical processes in coal mining using the Velenje mining method
Gregor Jeromel, Milan Medved, Jakob Likar, 2010, izvirni znanstveni članek

Opis: With in-depth geomechanical analyses of sub-level mining using the longwall mining method we can identify the relationships between the physical and mechanical parameters of geological materials, depending on the intensity of the coal extraction. The extent and the intensity of the mining operations impose impacts on the stresses and cause deformation changes in the rocks and in the coal seams on a broader area of excavations. The method of sub-level coal extraction requires multi-caving of the hanging-wall layers, which are recompressed, and in sub-level stoping each represents a hanging wall. The repeating processes of caving-in and compression, from the aspect of the theory of plasticity, have been relatively little researched because every such process brings about structural changes in natural, multi-caved and recompressed materials in the hanging wall. The intensity of the coal extraction has direct impacts on the surrounding and distant mining areas. Extensive stress and deformation changes in the surrounding area, and in the mine, represent a safety hazard for the employees, since the supporting system in the mine roadway could collapse. Therefore, a controlled excavation of the coal, and a good understanding of the geomechanical properties of all the materials and processes involved, is extremely important for planning and managing economic production, while also ensuring safe mining operations. A numerical model that allows for in-depth analyses of the geomechanical processes that occur in the hanging wall, the footwall and in the coal seam during sub-level coal excavation, is broadly applicable and highly relevant for analysing the intensity and the level of the caving processes in sub-level coal mining, and for making realistic plans for coal excavation with workers’ safety in mind.
Ključne besede: coal mining, sub-level mining method, longwall coal mining method, carving processes, finite-difference method, FLAC, mathematical model
Objavljeno: 11.06.2018; Ogledov: 9; Prenosov: 0
.pdf Celotno besedilo (589,19 KB)

8.
Numerical study of the dynamic active lateral earth pressure coefficient of cohesive soils
Mehrab Jesmani, Hossein Alirezanejad, Hamed Faghihi Kashani, Mehrad Kamalzare, 2017, izvirni znanstveni članek

Opis: Retaining walls are proposed in many projects, such as bridges, coastal structures, road constructions and wherever lateral support is required for the vertical surface of an excavation. The active lateral pressure coefficient of soil, Ka , is an important parameter for studying the static and dynamic behaviors of these retaining walls. Many studies have evaluated this coefficient in static situations, but in most previous dynamic studies, researchers have worked on the behavior of cohesionless backfill soil or made simplifying assumptions (e.g., pseudo-static status) for cohesive soils as backfill soil. In this study, the size of the active lateral earth pressure coefficient (Ka) was studied in a full dynamic situation (Kae). A retaining wall with cohesive backfill soil is evaluated using the finite-difference method (FDM) and the effects of important soil and loading properties are assessed. The model is based on Mohr-Coulomb failure criteria under seismic loading. The results show that the value of Kae at the top of the wall, where it is highly sensitive to any variation in the soil and loading properties, is greater than one due to the high pressure value induced by the horizontal dynamic acceleration and the presence of tension cracks.
Ključne besede: dynamic active lateral earth pressure coefficient (Kae), cohesive backfill soil, finite difference method (FDM), tension cracks, retaining wall, seismic loading
Objavljeno: 18.06.2018; Ogledov: 36; Prenosov: 0
.pdf Celotno besedilo (3,26 MB)

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