The comparative study of polymers for sliding pairs with UNMT (Universal Nano/Micro Tester)

In the article the results of comparative research of eight types of polymers, used in sliding pairs, are presented. For the selected polymers mechanical properties and then also their tribological characteristics were examined with UNMT (UNMT - Universal Nano/Micro Tester) to select the best material. Friction coefficient and wear measurements were performed with reciprocating ball-on-disk pair of UNMT under dry lubrication conditions. The usefulness of UNMT was confirmed as a quick and precise method. Presented results showed also that the best antifriction and anti-wear properties were observed for polymer with small hardness and elasticity module

The Reproduction of Labour Power in Capitalism

W niniejszym artykule autor analizuje stosunki występujące między pracą reprodukcyjną a kapitałem. Bada również możliwości ich zerwania.The article focuses on the reproductive labour’s role in capitalism and its political implications. It constitutes a part in the discussion on the reproductive labour

The structure of the real line in quantum mechanics and cosmology

We discuss the recently proposed model, where the spacetime in large scales is parametrized by the usual real line R, while at small (quantum mechanical) scales, the space is parametrized by the real numbers RM from some formal model M of Zermelo–Fraenkel set theory. We argue that the set-theoretic forcing is an important ingredient of the shift from micro- to macroscale. The set RM, describing the space at the Planck era, is merely a meager subset of R. It is Lebesgue non-measurable and all its measurable subsets have Lebesgue measure 0. According to this, the contributions to the cosmological constant from the zero-point energies of quantum fields vanish. Moreover, the emerged irregularities in the real line can be considered as the source of the primordial quantum fluctuations

Experimental vibration test of the cycloidal gearbox with different working conditions

The article undertakes the problem of vibrations induced in the cycloidal gearbox. The gearbox was calculated, designed and tested by the article authors. To perform the test a testing bench was built. The bench includes electric motors, torque meters and application to control working parameters. The input engine works at constant velocity mode and the braking unit with constant torque mode. The test was made for different configuration of working parameters

Building the cosmological models vs. different models of set theory

We use the ‘local weakening of logic in a space-time’ as a mathematical tool suitable also for building cosmological models. One obtains the extensions of the regular space-time solutions of Einstein equations towards solutions with certain space-time singularities. Such space-time models are also natural for addressing the renormalization questions of various quantum field theories. We discuss some examples

NOWY ALGORYTM HYBRYDOWY WYKORZYSTUJĄCY AUTOENKODER KONWOLUCYJNY Z SVM DLA ELEKTRYCZNEJ TOMOGRTAFII IMPEDANCYJNEJ I TOMOGRAFII ULTRADŹWIĘKOWEJ

This paper presents a new hybrid algorithm using multiple Support Vector Machines models with convolutional autoencoder to Electrical Impedance Tomography, and Ultrasound Computed Tomography image reconstruction. The ultimate hybrid solution uses multiple SVM models to convert input measurements to individual autoencoder codes representing a given scene then the decoder part of the autoencoder can reconstruct the sceneArtykuł przedstawia nowy hybrydowy algorytm który używa modeli maszyn wektorów nośnych wraz z autoenkoderem konwolucyjnym do rekonstrukcji obrazu z Elektrycznej Tomografii Impedancyjnej oraz Ultrasonograficznej Tomografii Transmisyjnej. Ostateczne rozwiązanie hybrydowe używa wielu modeli SVM do konwersji pomiarów wejściowych do pojedynczych kodów autoenkodera reprezentujących daną scenę a wtedy dekoder wycięty z autoenkodera może zrekonstruować daną scen

ZASTOSOWANIE BIBLIOTEK NUMERYCZNYCH W OBLICZENIACH MEB

Numerical library usage effectively reduce computation time and facilitate code programming. There are modified versions of popular BLAS and LAPACK libraries, dedicated to multi-core and distributed programming respectively PBLAS and SCALAPACK. Currently, a similar development applies to the GPU programming in two major implementations of GPGPU: NVIDIA CUDA and Kronos / ATI OpenCL. In the same time hybrid CPU-GPU versions of these libraries are intensively developed, a good example of that is MAGMA. This paper will present the effects of some of those libraries implementation used to solve the two-dimensional planar capacitor model by the boundary element method with constant boundary elements.Zastosowanie bibliotek numerycznych pozwala na znaczne skrócenie czasu obliczeń i ułatwienie pisania kodu programu. Popularne biblioteki BLAS i LAPACK doczekały się dojrzałych implementacji pozwalających na wykorzystanie procesorów wielordzeniowych i środowisk obliczeń rozproszonych w postaci odpowiednio PBLAS i SCALAPACK. Aktualnie podobny proces rozwoju dotyczy środowisk związanych z obliczeniami wykonywanymi na procesorach GPU w dwóch głównych implementacjach GPGPU: NVIDIA CUDA i Kronos/ATI OpenCL. Równolegle z rozwojem tych ostatnich toczą się prace nad mieszanymi CPU-GPU wersjami tych bibliotek czego doskonałym przykładem jest MAGMA. W artykule przedstawione zostaną efekty implementacji kilku wybranych bibliotek z tego zakresu zastosowanych do rozwiązania dwuwymiarowego modelu kondensatora płaskiego metodą elementów brzegowych wykorzystującą stałe elementy brzegowe

Dimension 4 : quantum origins of spacetime smoothness

We further develop recently proposed cosmological model based on exotic smoothness structures in dimension 4 and Boolean-valued models of Zermelo–Fraenkel set theory. The approach indicates quantum origins of large-scale smoothness and justifies the dimension 4 as the unique dimension for a spacetime. Of particular importance is the hyperbolic geometry of exotic R4 submanifolds of codimensions 1 and 0. It is argued that the global 4-dimensional manifold representing the Universe beyond the present observational scope is the direct sum of complex surfaces K3#CP(2)

The latent meaning of forcing in quantum mechanics

We analyze random forcing in QM from the dual perspective of the measure and category correspondence. The dual Cohen forcing allows interpreting the real numbers in a model M and its Cohen extension M[G] as absolute subtrees of the binary tree (Cantor space). The trees are spanning non-trivial Casson handles of smooth exotic 4-manifolds, like R4. We formulate the consequences for the cosmological model with random forcing where dual smooth non-standard and non-flat Riemannian geometries have to appear

From quantum to cosmological regime. The role of forcing and exotic 4-smoothness

Recently, a cosmological model based on smooth open 4-manifolds admitting non-standard smoothness structures was proposed. The manifolds are exotic versions of R4 and S3 R. The model has been developed further and proven to be capable of obtaining some realistic cosmological parameters from these exotic smoothings. The important problem of the quantum origins of the exotic smoothness of space-time is addressed here. It is shown that the algebraic structure of the quantum-mechanical lattice of projections enforces exotic smoothness on Rn. Since the only possibility for such a structure is exotic R4, it is found to be a reasonable explanation of the large-scale four-dimensionality of space-time. This is based on our recent research indicating the role of set-theoretic forcing in quantum mechanics. In particular, it is shown that a distributive lattice of projections implies the standard smooth structure on R4. Two examples of models valid for cosmology are discussed. The important result that the cosmological constant can be identified with the constant curvature of the embedding (exotic R4) ! R4 is referred. . The calculations are in good agreement with the observed small value of the dark energy density