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Wyświetlanie 1-15 z 53
Tytuł:
Cosserat gyro-birefringence. An introduction to nonsymmetrical photoelasticity
Autorzy:
Sikoń, M.
Powiązania:
https://bibliotekanauki.pl/articles/201097.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Cosserat medium
gyro-birefringence
photoelasticity
Opis:
Mechanical couple stresses modify at a microscopic level optical properties of some materials so they can display gyro-birefringence phenomena. The Optical Cosserat medium is defined and optical rotation tensor relative to couple stress is introduced. The generalized tensor of the dielectric permittivity is written for the Cosserat medium. Split of the plane-polarized light wave on passing through the Cosserat medium is shown and rotation of the azimuth of polarization is expressed by components of the couple stress tensor.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2012, 60, 1; 89-94
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Muzeum: transformacje medium na tle procesów konwergencji
Museum: Transformation of the Medium against the Background of Convergence Processes
Autorzy:
Mikułowski Pomorski, Jerzy
Powiązania:
https://bibliotekanauki.pl/articles/1373647.pdf
Data publikacji:
2011-11-22
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
contemporary culture
museum
medium
kultura współczesna
muzeum
Opis:
The Author ponders changes in the perception of the institution of museum, which he treats as a medium. He considers its constitutive features: spatiality and transfer function. In his opinion, in the contemporary world of cultural convergence the museums, once limited with institutional perspective, targeted their attention at the needs and experiences of a viewer — they have become a piece of land which may be developed by people according to their own group needs.
Źródło:
Kultura i Społeczeństwo; 2011, 55, 4; 129-147
2300-195X
Pojawia się w:
Kultura i Społeczeństwo
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Level of specialization and management methods in small and medium enterprises of the gas industry
Autorzy:
Motała, D.
Bystryakov, A. Y.
Pizengolts, V. M.
Powiązania:
https://bibliotekanauki.pl/articles/406791.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
small and medium enterprises
specialization
management methods
Opis:
Corresponding author: Daria Motała Received: 24 January 2018 Abstract Accepted: 12 June 2018 In small and medium-sized enterprises (SMEs), the ways of operating are dependent on the specific nature of their business activity, while management methods are often used intuitively. The paper shows that specialization, defined as offering products to companies from one or from two to four industries, is of great importance among SMEs in the gas sector. The analysis of the applied management methods allows us to conclude that the most important ones are those related to human capital.
Źródło:
Management and Production Engineering Review; 2018, 9, 2; 80-87
2080-8208
2082-1344
Pojawia się w:
Management and Production Engineering Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Monitoring of Partial Discharges in Cable Insulation and Cable Head Using Acoustic Method
Autorzy:
Ranachowski, Zbigniew
Wieczorek, Krzysztof
Ranachowski, Przemysław
Dębowski, Tomasz
Powiązania:
https://bibliotekanauki.pl/articles/2141672.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
partial discharges
medium voltage insulation
acoustic emission
Opis:
The article presents the application of Acoustic Emission (AE) method for detection and registration of partial discharges (PD) generated in medium voltage (MV) cable isolation and MV cable head. The insulation of the high voltage cable is made of a flexible material whose properties are characterised by a high coefficient of attenuation of the acoustic signals. For this reason, the AE method has not been used so far to detect PD in energetic cables. The subjects of the research were the MV cable and the standard T-type cable head. The cable contained defects which were the source of partial discharges. In case of cable head the PD were provoked by thin grounded electrode which was introduced into connector opening. The results of AE measurements are presented in the form of spectrograms. Acoustic Emission was evoked when the applied voltage level reached the value of 7.5 kV for the cable and 4 kV for the cable head. The authors used the acoustic instrumentation of their own design intended for future field use. Obtaining successful results of partial discharges measurements using the acoustic method in the cable insulation makes an original contribution of the presented work.
Źródło:
Archives of Acoustics; 2022, 47, 2; 259-265
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
In vitro and molecular characterization using ISSR markers of Glycyrrhiza glabra L.
Autorzy:
El-Hameid, A.A.
El-Kheir, Z.A.
Abdel-Hady, M.
Helmy, W.
Powiązania:
https://bibliotekanauki.pl/articles/80908.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
licorice
Glycyrrhiza glabra
callus induction
genomic DNA
ISSR marker
molecular characteristics
polymerase chain reaction
kinetin
Murashige medium
Skoog's medium
Źródło:
BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology; 2018, 99, 4
0860-7796
Pojawia się w:
BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of Al, Cu and Ni Additions on Mechanical Properties of Hot-Rolled Fe-9Mn-0.2C Medium-Manganese Steels
Autorzy:
Yoon, Young-Chul
Kim, Sang-Gyu
Lee, Sang-Hyeok
Hwang, Byoungchul
Powiązania:
https://bibliotekanauki.pl/articles/2048881.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
medium manganese steel
hot-rolled
microstructure
strength
impact toughness
Opis:
The microstructure and mechanical properties of hot-rolled Fe-9Mn-0.2C medium-manganese steels with different Al, Cu, and Ni contents were investigated in this study. Based on the SEM, XRD, and EBSD analysis results, the microstructure was composed of martensite, band-type delta ferrite, and retained austenite phases depending on the Al, Cu, and Ni additions. The tensile and Charpy impact test results showed that the sole addition of Al reduced significantly impact toughness by the presence of delta-ferrite and the decrease of austenite stability although it increased yield strength. However, the combined addition of Al and Cu or Ni provided the best combination of high yield strength and good impact toughness because of solid solution strengthening and increased austenite stability.
Źródło:
Archives of Metallurgy and Materials; 2021, 66, 4; 1007-1011
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Suitability of selected culture media for Blastocystis spp.
Autorzy:
Piekara-Stępińska, A.
Gorczykowski, M.
Piekarska, J.
Powiązania:
https://bibliotekanauki.pl/articles/2087642.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Blastocystis spp.
in vitro culture
zoonosis
Jone’s medium
Źródło:
Polish Journal of Veterinary Sciences; 2018, 21, 4; 815-817
1505-1773
Pojawia się w:
Polish Journal of Veterinary Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The onset of thermal convection in couple-stress fluid in hydromagnetics saturating a porous medium
Autorzy:
Rana, G. C.
Powiązania:
https://bibliotekanauki.pl/articles/201216.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
couple stress fluid
magnetic field
porous medium
thermal convection
Opis:
In this paper, the effect of magnetic field on thermal convection in couple-stress fluid saturating a porous medium is considered. By applying linear stability theory and the normal mode analysis method, a mathematical theorem is derived which states that the viscoelastic thermal convection at marginal state, cannot manifest as stationary convection if the thermal Rayleigh number R, the medium permeability parameter Pι the couple-stress parameter F and the Chandrasekher number Q, satisfy the inequality R ≤4π2/Pl (1 + 2π2F + PlQ/2ε) the result clearly establishes the stabilizing character of couple-stress parameter and magnetic field whereas destabilizing character of medium permeability.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2014, 62, 2; 357-362
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The process of opportunities exploration and exploitation in the development of SMES’ innovativeness
Autorzy:
Matejun, M.
Powiązania:
https://bibliotekanauki.pl/articles/406830.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
entrepreneurship
business opportunities
innovation management
small-sized enterprises
medium-sized enterprises
Opis:
The aim of the paper is to present an overview of the theoretical basis and stages of the process of opportunities exploration and exploitation in the development of innovativeness of small and medium-sized enterprises (SMEs) and its preliminary empirical verification on the basis of experience derived from economic practice. The aim of the paper is realized based on the author’s own empirical research carried out in the form of a case study conducted among 5 innovative SME companies in Poland. The results indicate that the analyzed companies associate opportunities directly with entrepreneurship and the development of innovative activity. They take various actions that are part of theoretical principles of effective opportunities exploration and exploitation, which allows them to obtain a number of pro-innovative benefits and which supports the creation of competitive advantage.
Źródło:
Management and Production Engineering Review; 2018, 9, 3; 3-15
2080-8208
2082-1344
Pojawia się w:
Management and Production Engineering Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Indeks, ikona i symbol. O stosunku fotografii, historii (czasu) i pamięci
Index, Icon and Symbol: On the Relationship of Photography, History (Time) and Memory
Autorzy:
Hamann, Christoph
Powiązania:
https://bibliotekanauki.pl/articles/1373645.pdf
Data publikacji:
2011-11-22
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
photography
history
medium
image
memory community
fotografia
historia
obraz
wspólnota pamięci
Opis:
The Author starts with a thesis that photography and modern historiography developed at the same time, and then tries to look for relationships between the two. He starts from analyzing a specificity of a photograph which — as a medium — not only represents the past, but can be an energizing impulse both in the presence and the future. By referring to the semiotic classification of Charles Sanders Peirce, the Author describes the importance of a photograph to historical research as an index, an icon and a symbol. This helps understand the way of using a collective resource of photographs and to define a status of digital photographs as a source. Finally, the Author tries to show the perspectives of visual history analysis and the role which might be played by images when forming and changing memory communities in the era of globalization and diversification.
Źródło:
Kultura i Społeczeństwo; 2011, 55, 4; 107-127
2300-195X
Pojawia się w:
Kultura i Społeczeństwo
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A Review on Feasible and Reliable Underwater Wireless Optical Communication System for achieving High Data Rate and Longer Transmission Distance
Autorzy:
Joseph, Lenin
Anandan, Sangeetha
Powiązania:
https://bibliotekanauki.pl/articles/2200713.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
UWOC
underwater channel
oceanic medium
optical signals
absorption
scattering
attenuation
turbulence
Opis:
Underwater Wireless Optical Communication (UWOC) offers significant research prospective with major challenges in the design and implementation. UWOC is capable of providing high rate of data transmission across large distances. This paper attempts to focus on the intricacies of practical implementations and open research issues of UWOC systems. Critical advances and progresses made in the field, modelling techniques and link design challenges are summarised. The purpose of this review is to give suggestions towards feasible and reliable UWOC design with improved performance. Finally the major points are summarized so that it will assist the future research in UWOC.
Źródło:
International Journal of Electronics and Telecommunications; 2022, 68, 4; 815--823
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Lean production development in SMEs: a case study
Autorzy:
Majava, J.
Ojanperä, T.
Powiązania:
https://bibliotekanauki.pl/articles/407155.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
lean manufacturing
operations management
production
small and medium sized enterprise (SME)
Opis:
The competitiveness of small and medium sized enterprises (SMEs) is vital for the European economy. Also, manufacturing is often the core competence of SMEs. Adopting lean philosophy is a viable and popular approach for developing production and enabling continuous improvement. Despite the increased interest in empirical lean research, the body of knowledge about lean manufacturing development in SMEs is currently insufficient. This paper describes a study of a lean development project in a Finnish-based manufacturing SME. A current state analysis and development proposals are presented. The project applies a framework that other SMEs can utilize in identifying their problem areas and creating development proposals for their production activities. The results of the study contribute to the existing body of knowledge in lean manufacturing. In addition, managers in SMEs can utilize the study results as a reference when designing production development projects.
Źródło:
Management and Production Engineering Review; 2017, 8, 2; 41-48
2080-8208
2082-1344
Pojawia się w:
Management and Production Engineering Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An effective medium ratio obeying meta-atom for multiband applications
Autorzy:
Hossain, M. J.
Faruque, M. R. I.
Islam, M. T.
Islam, S. S.
Powiązania:
https://bibliotekanauki.pl/articles/201192.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
compact
effective medium ratio
meta-atom
multiband
kompakt
średni wskaźnik efektywności
Opis:
In this paper, an effective medium ratio obeying, negative refractive index, compact meta-atom was designed, manufactured and tested for operation in a multiband microwave regime. The proposed meta-atom structure obeyed better effective medium ratio. The results of the measurement were verified by the commercially available Computer Simulation Technology (CST) Studio Suite 2014 simulator. The effective medium ratio obeying meta-atom displayed multiband response, in conjunction with negative refractive index property over a certain frequency band in the microwave frequency span. Furthermore, a few parametric analyses were completed with the meta-atom, and the effective medium parameters were investigated. The sizes and complex scattering constitutive parameters of the proposed negative refractive index, compact meta-atom are applicable for multiband applications in microwave regime.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2017, 65, 2; 139-147
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of High-Temperature Annealing on the Cross-Tension Property of Resistance Spot Welded Medium-Mn Steel
Autorzy:
Zhao, Bingge
Wang, Yuanfang
Sun, Chenyu
Ding, Kai
Wu, Guanzhi
Wei, Tao
Pan, Hua
Gao, Yulai
Powiązania:
https://bibliotekanauki.pl/articles/2174565.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
medium Mn steel
resistance spot welding
cross-tension strength
martensite
fracture
Opis:
As one of the most promising 3rd generation advanced high strength steels (AHSS), medium Mn steels attract much attention because of their exceptional mechanical property and reasonable cost. However, their application in the modern automotive industry is limited by poor weldability. In this study, 7Mn steel was welded by resistance spot welding (RSW), which was followed by high-temperature annealing to increase the cross-tension property. With this effort, enhanced cross-tension strength (CTS) with a partial interfacial fracture (PIF) mode was realized. During the annealing after RSW that produced martensite, austenitization was realized and then evolved into martensite by the following air cooling. This process produced structure homogeneity across the joint. With respect to the RSW joint, martensite remained the dominant structure after annealing while the diffusion of C and Mn solutes was triggered. With the increase of annealing temperature, the diffusion was enhanced, and the grain boundary embrittlement was reduced, leading to higher CTS.
Źródło:
Archives of Metallurgy and Materials; 2022, 67, 4; 1293--1298
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Morphological and enzymatic variability and adaptation of zig-zag clover [Trifolium medium L.]
Autorzy:
Bulinska-Radomska, Z
Powiązania:
https://bibliotekanauki.pl/articles/2043605.pdf
Data publikacji:
1999
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
zig-zag clover
Polska
enzyme variability
adaptation
morphological variability
Trifolium medium
climate
Źródło:
Journal of Applied Genetics; 1999, 40, 4; 293-304
1234-1983
Pojawia się w:
Journal of Applied Genetics
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 53

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