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Wyświetlanie 1-15 z 1112
Tytuł:
An Energy Efficient QAM Modulation with Multidimensional Signal Constellation
Autorzy:
Markiewicz, T. G.
Powiązania:
https://bibliotekanauki.pl/articles/227049.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
communication system
QAM modulation
lattice
multidimensional constellations
Opis:
Packing constellations points in higher dimensions, the concept of multidimensional modulation exploits the idea drawn from geometry for searching dense sphere packings in a given dimension, utilising it to minimise the average energy of the underlying constellations. The following work analyses the impact of spherical shaping of the constellations bound instead of the traditional, hyper-cubical bound. Balanced constellation schemes are obtained with the N-dimensional simplex merging algorithm. The performance of constellations of dimensions 2, 4 and 6 is compared to the performance of QAM modulations of equivalent throughputs in the sense of bits transmitted per complex (twodimensional) symbols. The considered constellations give an approximately 0.7 dB to 1 dB gain in terms of BER over a standard QAM modulation.
Źródło:
International Journal of Electronics and Telecommunications; 2016, 62, 2; 159-165
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Offsetting of Polycoeliina
Autorzy:
Iljina, T.G.
Powiązania:
https://bibliotekanauki.pl/articles/22904.pdf
Data publikacji:
1980
Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Źródło:
Acta Palaeontologica Polonica; 1980, 25, 3-4
0567-7920
Pojawia się w:
Acta Palaeontologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of the information (post-industrial) stage of productive forces development on capital cycle flow nature
Wpływ etapu informacyjnego (postindustrialnego) w rozwoju sił wytwórczych na cykle przepływów kapitału
Autorzy:
Kaminska, T.G.
Powiązania:
https://bibliotekanauki.pl/articles/78924.pdf
Data publikacji:
2013
Wydawca:
Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:
information stage
postindustrial economy
postindustrial society
productive force
development
capital cycle
information society
capital flow
Źródło:
Folia Pomeranae Universitatis Technologiae Stetinensis. Oeconomica; 2013, 73
2081-0644
Pojawia się w:
Folia Pomeranae Universitatis Technologiae Stetinensis. Oeconomica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Physique des Solides et Morphologie des Surfaces
Autorzy:
Rousseau, J.
Mathia, T.G.
Powiązania:
https://bibliotekanauki.pl/articles/1929231.pdf
Data publikacji:
1993-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
68.35.-p
68.55.Jk
Opis:
PHYSICS OF SOLIDS AND MORPHOLOGY OF SURFACES: The morphology of surfaces is now an important field of research because of its direct connection with the industrial activity like manufacturing and optimising of functional criteria through complicated interfacial phenomena. Presently, characterization of the surface morphology, via the profile metrology, is well modelled by a statistical description. The use of shape morphological parameters allows to identify features of the surface structures generated by the process techniques and the emergence of the different phases of the condensed matter. Starting from the solid state background knowledge, prediction of the surface morphology appears as a tedious way. However, progress in the science of the solids formation and industrial requirements promises the best future for the physicists in such a new technological activity. Philosophy and basic formalism of that approach is presented here.
Źródło:
Acta Physica Polonica A; 1993, 83, 5; 535-550
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Acoustic radiation of vibrating plate structures submerged in water
Autorzy:
Nowak, Ł.
Zieliński, T. G.
Powiązania:
https://bibliotekanauki.pl/articles/331890.pdf
Data publikacji:
2012
Wydawca:
Polskie Towarzystwo Akustyczne
Opis:
The paper presents results of the theoretical and numerical investigation on acoustic radiation of vibrating plate structures submerged in water. The current state of the art on the considered issues is briefly reviewed. Then, the method for determining eigenmode shape functions and eigenfrequencies of plate vibrating in water that has been used in presented study is introduced. The constitutive equations for solid domain and the pressure acoustic equation for liquid domain are coupled via boundary conditions and solved numerically using the finite element method. Structural mode shapes and eigenfrequencies computed for plate submerged in water are compared to analogous results obtained for air and for the in vacuo case. It is assumed, that the plate is rectangle shaped and that it is placed in an infinite rigid baffle. Three-dimensional near- and far-field acoustic radiation characteristics for the plate vibrating in water are introduced. Possibilities of implementation of the active control system for reduction of the hydroacoustic emission are briefly discussed.
Źródło:
Hydroacoustics; 2012, 15; 163-170
1642-1817
Pojawia się w:
Hydroacoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The metrology of ground concrete surfaces morphology with 3D laser scanner
Autorzy:
Sadowski, L.
Mathia, T. G.
Powiązania:
https://bibliotekanauki.pl/articles/407237.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
concrete
metrology
morphology
3D laser scanner
grinding
roughness parameters
Opis:
This paper is devoted to machining of concrete by grinding and the metrology of its surface morphologies. The surface morphology is still open problem from metrological as well as mathematical morphology points of views. In order to understand better abrasive process the raw morphologic state is compared with the ground concrete surfaces. The most significant results are presented in the form of profiles, 3D isometric views and isotropy analysis. Several 3D surface roughness parameters were calculated.
Źródło:
Management and Production Engineering Review; 2015, 6, 2; 40-44
2080-8208
2082-1344
Pojawia się w:
Management and Production Engineering Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Sclero-topometry metrology in valorisation of waste oil for micro-machining of ductile cast iron
Autorzy:
Eymard, S.
Ignaszak, Z.
Mathia, T. G.
Powiązania:
https://bibliotekanauki.pl/articles/947506.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
sclero topometry
waste oil
scratch test
ductile cast iron
oil revalorizationin machining
olej odpadowy
próba zarysowania
żeliwo sferoidalne
Opis:
During the time, the specific characteristics and the efficient life time of oil progressively decrease, due to complex pollution, ultimately making the oil unsuitable for the initial applications. The strategy to regenerate and to valorise waste oils is investigated using improved combinations of sclerometric and topometric tests on ductile nodular cast iron. Tribo-abrasive tests are performed in critical conditions, with base oil, waste oil and regenerated oil, of similar viscosities in order to discriminate their interfacial performances. The forms of the scratch traces indicate wear resistance and tendency to elasto-plastic deformation. The mechanisms of deformation and frictional behaviours were evaluated using optical and Scanning Electron Microscopy and measured for various tribological conditions with tactile and optical profilometry. The Energy Dispersive X ray Spectroscopy completes the chemical superficial distribution of pertinent elements. The surface topography metrology is used to characterize the scratch profiles and to determine the volume of the displaced and removed material, as well as maximum pit height. The originality of this paper is that it is a unique approach specifically devoted to transformer oil concerning tribological conditions.
Źródło:
Archives of Foundry Engineering; 2013, 13, 4; 29-38
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Interaction of Physical and Mental Work
Autorzy:
Singh, S.
Aghazadeh, F.
Ray, T. G.
Powiązania:
https://bibliotekanauki.pl/articles/90541.pdf
Data publikacji:
2002
Wydawca:
Centralny Instytut Ochrony Pracy
Tematy:
physical work
mental work
psychophysical methods
acceptable load limit
fatigue
praca a choroby
praca mięśni
praca umysłowa
obciążenie pracą umysłową
obciążenie fizyczne
zmęczenie
zmęczenie fizyczne
Opis:
The objective of the research was to determine the effect of mental load on the physical capacity of an individual. An experiment involving 9 combinations of lifting tasks, 1 lowering task, and 3 treadmill tasks was conducted. Heart rate was measured and maximum acceptable weight of lift was determined using the psychophysical method. A simple multiplication task was used as the mental load. The output variables were determined with and without the mental task. The results indicate that the individual’s physical capacity decreased with the mental task while lifting from floor to knuckle and shoulder to reach lifting heights.
Źródło:
International Journal of Occupational Safety and Ergonomics; 2002, 8, 4; 451-463
1080-3548
Pojawia się w:
International Journal of Occupational Safety and Ergonomics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Improving performance by harmonious culture approach in internal marketing
Poprawa wydajności według podejścia harmonijnej kultury w marketingu wewnętrznym
Autorzy:
Sukawati, T. G. R.
Astawa, I. P.
Powiązania:
https://bibliotekanauki.pl/articles/953209.pdf
Data publikacji:
2017
Wydawca:
Politechnika Częstochowska
Tematy:
employee rewards
recruitment process
internal communication
employee empowerment
employees training
harmonious culture
performance
nagrody dla pracowników
proces rekrutacji
komunikacja wewnętrzna
wzmocnienie pozycji pracowników
szkolenie pracowników
harmonijna kultura
wydajność
Opis:
Internal marketing, consisting of employee rewards, recruitment process, internal communication, employee empowerment, and employees training, is still in debates in the previous researches. This research aims to test the five components of internal marketing in the perspective of harmonious culture. The research is different to the previous researches that are oriented to the formal regulations of the company. The research is conducted in two stages. First, qualitatively through a harmonious cultural approach on internal marketing and followed by a quantitative test through multiple regression analysis to find out the relationship to the performance. Respondent target in the research is all hotel managers and it is started with debt interview to see the implementation of harmonious culture. The study result indicates that harmonious culture is not completely implemented in the internal marketing. Recruitment process and internal communication give a significant contribution in the development of hotel performance. Collaboration between culture and employee rewards, recruitment process, internal communication, employee empowerment, and employees training is a new thing in developing the company’s internal strengths to create better performance. Hotel managers, in fulfilling the customer expectations, could use internal marketing that is packed in harmonious culture by emphasizing the harmonious relationship between employees, work place, and the spiritual values or beliefs of the employee.
Marketing wewnętrzny, składający się z nagród pracowniczych, procesu rekrutacji, komunikacji wewnętrznej, upodmiotowienia pracowników i szkoleń dla pracowników, wciąż jest przedmiotem debat w badaniach. Celem tego badania było przetestowanie pięciu komponentów marketingu wewnętrznego z perspektywy kultury harmonijnej. Niniejsze badania różnią się od badań z lat poprzednich, które ukierunkowane są na formalne regulacje firmy. Badanie przeprowadzone zostało w dwóch etapach. Etap pierwszy, jakościowy, poprzez harmonijne podejście kulturowe do marketingu wewnętrznego, etap kolejny obejmował test ilościowy, poprzez analizę regresji wielokrotnej, aby znaleźć związek z wydajnością. Respondentami w badaniu byli menedżerowie hoteli, badanie rozpoczynało się od rozmowy o długu, w celu zyskania informacji dotyczących wdrożenia kultury harmonijnej. Wyniki badania wskazują, że harmonijna kultura nie jest w pełni wdrożona w marketingu wewnętrznym. Proces rekrutacji i komunikacja wewnętrzna w znacznym stopniu przyczyniają się do rozwoju działalności hoteli. Zależność między kulturą a wynagradzaniem pracowników, proces rekrutacji, komunikacja wewnętrzna, wzmocnienie pozycji pracowników i szkolenie pracowników to nowy element w rozwijaniu wewnętrznych atutów firmy w celu uzyskania lepszych wyników. Menedżerowie hoteli, spełniając oczekiwania klientów, mogli korzystać z marketingu wewnętrznego, który podkreślaja harmonijny związek między pracownikami, miejscem pracy, a duchowymi wartościami lub przekonaniami pracownika.
Źródło:
Polish Journal of Management Studies; 2017, 16, 1; 226-233
2081-7452
Pojawia się w:
Polish Journal of Management Studies
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A method and new parameters for assessing the active surface topography of diamond abrasive films
Autorzy:
Kacalak, W.
Tandecka, K.
Mathia, T. G.
Powiązania:
https://bibliotekanauki.pl/articles/99984.pdf
Data publikacji:
2016
Wydawca:
Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Tematy:
microfinishing film
diamond
active surface
Opis:
This paper describes the methodology and results of research on the tribological characteristics of the surfaces of diamond abrasive films using a stereometric analysis. Abrasive films are used in various finishing processes of surfaces with very high smoothness and accuracy. A morphological analysis of surface vertexes in the plane that is parallel to the film surface and the perpendicular direction allowed an assessment of the distances between particles by means of a decomposition of the surface into Voronoi cells. When studying the formation of the aggregates of diamond particles and the spaces between them, one may infer about the machining potential of the abrasive film and determine the recommended kinematic conditions of the film that ensures the maximum use of this potential. Owing to the investigations related to the morphology of diamond abrasive films, one can observe relevant characteristic abrasive aggregates that vary in term of size and shape depending on particle sizes. Units with elongated shapes have a superior machining ability in relation to spherical-shaped units. One of significant parameters proposed that describe the technological potential of abrasive films is the edge length to width ratio of diamond units. Different operating modes are discussed. A statistical analysis of the dynamics observed of abrasive interfaces allowed a pertinent description of the abrasive process taking into consideration nominal and apparent as well as abrasively efficient morphologies.
Źródło:
Journal of Machine Engineering; 2016, 16, 4; 95-108
1895-7595
2391-8071
Pojawia się w:
Journal of Machine Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Prediction of Microfinishing Effects with the Use of Abrasive Films Utilizing Data Characterizing Their Surface Topography
Autorzy:
Kacalak, W.
Tandecka, K.
Mathia, T. G.
Powiązania:
https://bibliotekanauki.pl/articles/100198.pdf
Data publikacji:
2015
Wydawca:
Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Tematy:
abrasive grain
microfinishing
forecasting
surface topography
Opis:
The publication describes the methodology and results of the studies on stereometric characteristics of the diamond surface of microfinishing films. This methodology is used in different treatments of precise finishing of very high smoothness and accuracy. One presented the results of analysis of vertices’ size in parallel plane to the film surface and towards perpendicular plane to it. Moreover, one performed an assessment of the distance between the grains using surface decomposition on Voronoi cell surface. In order to determine the film surface necessary to perform a particular microfinishing operation, one developed an index which is dependent on the overall profile of the film in the form of an envelope of the sum of vertices’ projections above a certain level. Studying the formation of diamond aggregates of abrasive grains and the spaces between them, one can conclude about the machining potential of microfinishing film and determine a recommended speed of the film displacement ensuring maximum utilization of this potential.
Źródło:
Journal of Machine Engineering; 2015, 15, 4; 103-112
1895-7595
2391-8071
Pojawia się w:
Journal of Machine Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Active vibroacoustic control of plate structures with arbitrary boundary conditions
Autorzy:
Nowak, Ł.
Zieliński, T. G.
Meissner, M.
Powiązania:
https://bibliotekanauki.pl/articles/31343106.pdf
Data publikacji:
2013
Wydawca:
Instytut Podstawowych Problemów Techniki PAN
Tematy:
vibroacoustics
active control
plate vibrations
aktywne sterowanie
wibroakustyka
Opis:
The paper describes briefly some main aspects of the active feedback control system that has been developed and constructed for reduction of vibroacoustic emission of vibrating plate structures with arbitrary boundary conditions. Relations between the forms and frequency of the vibrations induced by an external harmonic excitation and the distribution of the generated acoustic pressure field are investigated using the developed numerical model based on indirect variational boundary element method. The aim of the control system is to minimize the sound pressure level in a given point of the ambient space. The system uses small, rectangle-shaped piezoelectric transducers as both sensors and actuators. The transducers are connected in a number of independent feedback loops, and the feedback gains are the control parameters which are optimized using the developed optimal control algorithm. The constructed active system has been tested for the stability and control performance during experimental research performed in an anechoic chamber. Results of experiments are presented in the paper, proving a high level of noise reduction and a good agreement with numerical predictions.
Źródło:
IPPT Reports on Fundamental Technological Research; 2013, 4; 5-9
2299-3657
Pojawia się w:
IPPT Reports on Fundamental Technological Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Determination of volatile organochalcogens using liquid phase microextraction and gas chromatography with fluorine-induced chemiluminescence detection
Autorzy:
Hashemi, M.
Montes, R. A.
Chasteen, T. G.
Powiązania:
https://bibliotekanauki.pl/articles/363124.pdf
Data publikacji:
2012
Wydawca:
Uniwersytet Warmińsko-Mazurski w Olsztynie
Tematy:
bacterial culture
fluorine-induced chemiluminescence
gas chromatography
microextraction
volatile organochalcogens
hodowla bakterii
chemiluminescencja indukowana fluorem
chromatografia gazowa
mikroekstrakcja
lotne organochalkogeny
Opis:
In this study, a simple and rapid liquid phase microextraction technique coupled with gas chromatography and fluorineinduced chemiluminescence detection has been developed for determination of volatile organochalcogens (dimethyl sulfide, dimethyl disulfide, dimethyl trisulfide and dimethyl diselenide and dimethyl telluride). The effects of extraction parameters such as extracting solvent and its volume, stirring time extraction time and salt effect were optimized. Also, analytical figures of merit such as response linearity, repeatability and reproducibility, and limits of detection have been evaluated. The proposed method was found to be a simple and rapid analytical procedure for determination of volatile organochalcogens in real aqueous samples with detection limits of 5-620ng·l-1. The relative recoveries of these analytes for spiked bacterial cultures, tap water and lake water ranged from 95 to 105% with the relative standard deviations of 0.3-11.0%.
Źródło:
Environmental Biotechnology; 2012, 8, 2; 55-62
1734-4964
Pojawia się w:
Environmental Biotechnology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A hydrodynamic methodology and CFD analysis for performance prediction of stepped planing hulls
Autorzy:
Ghassemi, H.
Kamarlouei, M.
Veysi, S. T. G.
Powiązania:
https://bibliotekanauki.pl/articles/260311.pdf
Data publikacji:
2015
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
planing hull
Hydrodynamic performance
CFD analyzed
Opis:
Nowadays all efforts in planing hull research are focused on resistance reduction for achieving the highest speed in fast planing crafts. Furthermore, many fruitful research projects have been carried out on marine coatings, planning equipment, and optimization of propeller and hull form, which revolutionized industry of high - speed crafts and made them an efficient survival vehicle in coastal areas and rivers. In this paper the hydrodynamic performance of planing hulls are investigated by means of a modified Savitsky model for both non-stepped and stepped bodies. Meanwhile, in order to meet this goal reasonably, effective geometrical parameters of planing hull are investigated and then operational hydrodynamic characteristics of the craft are predicted by using a computational program. Finally, the calculation results are verified by means of a CFD- analysis model.
Źródło:
Polish Maritime Research; 2015, 2; 23-31
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 1112

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