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1
Content available Preparing the production of a new product in small and medium-sized enterprises by using the method of projects management
Bijańska J., Wodarski K., Wójcik J.
Management Systems in Production Engineering
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2016
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nr 2 (22)
128--134
EN
Efficient and effective preparation the production of new products is important requirement for a functioning and development of small and medium sized enterprises. One of the methods, which support the fulfilment of this condition is project management. This publication presents the results of considerations, which are aimed at developing a project management model of preparation the production of a new product, adopted to specificity of small and medium-sized enterprises.
PL
Sprawne i efektywne przygotowanie produkcji nowych wyrobów jest ważnym warunkiem funkcjonowania oraz rozwoju małych i średnich przedsiębiorstw. Jedną z metod wspomagających spełnienie tego warunku jest zarządzanie projektami. W publikacji przedstawiono modele przygotowania produkcji nowego wyrobu z wykorzystaniem metody zarządzania projektami, dostosowane do specyfiki małych i średnich przedsiębiorstw.
2
Content available Differentiation of random structure properties using wavelet analysis of backscattered ultrasound
Gambin B., Wojcik J., Doubrovina O.
Hydroacoustics
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2016
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Vol. 19
121--128
EN
The aim of this work was to find the differences between random media by analyzing the properties of the ultrasound signals backscattered from the inhomogeneities. A numerical model is used to generate two types of random media. The first has the randomness in scatterers’ positions and the second has the randomness in the size and acoustical properties of scatterers. The numerical model of wave scattering has been used to simulate the RF (radio frequency) signals caused by the incident pulse traveling as a plane wave. The markers of randomness type differences between the scattering media were obtained with the help of the spectral and wavelet analysis. The effect of differences in randomness type is more spectacular when the wavelet analysis is performed.
3
Content available Theoretical results and numerical study on the nonlinear reflection and transmission of plane sound waves
Wojcik J., Gambin B., Litniewski J.
Hydroacoustics
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2015
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Vol. 18
181-192
EN
The comparison between theoretical and numerical solutions of the reflection/transmission problem for the acoustic plane wave normally incident on the discontinuity surface between two nonlinear lossy media was presented. Numerical calculations made under the assumption that the two media have the same impedance, allow to single out the effect of nonlinearities in the description of the reflection and transmission phenomena, so they agreed with theoretical predictions. It was shown that theoretically obtained and numerically calculated results mutually confirmed themselves.
4
Content available Estimation of layer thickness by the cost function optimization: phantom study
Tasinkiewicz J., Podhajecki J., Wojcik J., Falińska K., Litniewski J.
Hydroacoustics
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2015
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Vol. 18
161-166
EN
The aim of this work is to present preliminary results of the layer thickness assessment method based on optimization approach. The developed method is based on a multilayer model structure. The measured acoustic signal reflected from the layer is compared with a simulated signal on the basis of a multilayer model. The cost function is defined as the difference between the reflected signal measured using pulse echo approach and the simulated signal. The thickness of the solid layer is the parameter which minimizes the cost function yielding desired solution. Minimization of the cost function is performed with the simulated annealing algorithm. The results obtained with the developed method using measurement data of a custom design model are compared with the reference value and the accuracy of the method is checked. The relative error of the thickness estimation is 1.44%.
5
Content available Foundation of the new method of numerical calculations of the nonlinear acoustics fields
Wojcik J., Filipczyński L., Nowicki A.
Hydroacoustics
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2013
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Vol. 16
253--262
EN
We explain, motivation behind this work and briefly describe foundation of new method which we have developed for efficient solution in PC environment of the nonlinear propagation equation with the boundary conditions applied for both circular and not circular transducers (like array). Comparison between new and old method will be presented for strongly nonlinear disturbance. At the end we will demonstrate the results of the numerical calculations of the nonlinear field propagating from the array.
6
Content available Applying crystallography in analysis of trabecular bone backscatter
Wojcik J., Litniewski J., Nowicki A., Gambin B.
Hydroacoustics
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2011
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Vol. 14
255-266
EN
Some important details of the Backscatter Effective Cross-Sections obtained for random scattering structures (like trabecular bone) are explain by comparison with the results obtained by means of the simplified theoretical model. The simplified model was (establish) and justified on the basis of the structural analysis of the results obtained for exact model of the field scattering on complex structures. The simplified model is commonly used in description of the scattering on the regular structures like crystal. Comparison with experimental results for the trabecular bone is also presented. The results allowed to conclude that crystallographic methods could be potentially useful for extracting characteristic features of trabecular bone.
7
Content available remote Special optical fiber type D applied in optical sensor of electric currents
Pustelny T., Barczak K., Gut K., Wojcik J.
Optica Applicata
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2004
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Vol. 34, nr 4
531-539
EN
The Paper deals with investigation concerning new optical fiber structures type D which may be applied in optical fiber sensors of magnetic field and electric current. These structures have been designed, produced and tested. The results of measurements of the magneto-optic effect and the distribution of mode fields in such optical fibers have been presented, as well as the test stand designed for investigation of magneto-optic phenomena.
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