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Tytuł:
New environmentally friendly low-pressure refrigerants mini-channel
Autorzy:
Sikora, Malgorzata
Bohdal, Tadeusz
Powiązania:
https://bibliotekanauki.pl/articles/2204072.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
refrigerants
global warming potential
ozone depletion potential
fluorinert liquid
hydrofluoroether
Opis:
Nowadays, in addition to the thermodynamic properties of refrigerants, their impact on the environment is of high significance. Hence, it is important to use refrigerants with the lowest possible values of ozone depletion potential and global warming potential indices in refrigeration, organic Rankine cycle (ORC), air conditioning, and heat pump systems. Natural refrigerants are the most environmentally friendly; unfortunately, they have less favourable thermodynamic properties. Currently, low-pressure refrigerants from the FC (fluorocarbons, fluorine liquids) and HFE (hydrofluoroether) groups are increasingly used. This paper presents the most important properties and applications of selected refrigerants from these groups and also reviews the literature on their use.
Źródło:
Archives of Thermodynamics; 2023, 44, 1; 89--104
1231-0956
2083-6023
Pojawia się w:
Archives of Thermodynamics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigation of value innovation potential under transitional conditions in Serbia
Autorzy:
Živković, D.
Manasijević, D.
Štrbac, N.
Niculović, M.
Živadinović, J.
Powiązania:
https://bibliotekanauki.pl/articles/406835.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
innovation
value innovation potential
transition
Opis:
Nowadays, business environment is faster than ever in the field of new technologies. The firms are forced to find new ways to compete and survive through innovations. To meet these demands, different tools and techniques are used in order to measure capability of firms to innovate. One of them is the Value Innovation Potential Assessment Tool, which helps to identify appropriate opportunities for firms to use it to assess their effectiveness of innovation work. The main goal of this paper was to investigate the Value Innovation Potential under transitional conditions in some firms in South-Eastern Serbia. The research was done using a questionnaire taken from literature, which was applied to one hundred employees in mentioned Serbian firms. The data were statistically analysed, explained and main conclusions were obtained. Proposed factor model of Value Innovation Potential was tested using confirmatory factor analysis (CFA) on investigated population.
Źródło:
Management and Production Engineering Review; 2015, 6, 2; 82-88
2080-8208
2082-1344
Pojawia się w:
Management and Production Engineering Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Innovative Potential as a Determinant of the Voivodeships Development in 2020
Potencjał innowacyjny determinantą rozwoju województw w 2020 r.
Autorzy:
Pawlik, Andrzej
Powiązania:
https://bibliotekanauki.pl/articles/2021418.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
development
innovation
innovativeness
innovation potential
voivodeship
Źródło:
Studia komitetu przestrzennego zagospodarowania kraju PAN; 2018, 184; 183-193
0079-3507
Pojawia się w:
Studia komitetu przestrzennego zagospodarowania kraju PAN
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Camera navigation support in a virtual environment
Autorzy:
Wojciechowski, A.
Powiązania:
https://bibliotekanauki.pl/articles/201537.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
virtual environment
camera navigation
potential field
Opis:
Artificial camera navigation is the most ubiquitous and principal interaction task within a virtual environment. Efficient and intuitive virtual scene navigation affects other tasks completion performance. Though many scientists have elaborated invaluable navigation techniques design guidelines, it is still, especially for novice users, the really challenging and demanding process. The user interface input hardware imprecision, interface operation cognitive burden put on users and deficiency of direct mapping between user physical movement and virtual camera navigation evoke discrepancy between user desired and actual camera position and orientation. The provided paper concentrates on the new potential field based camera navigation support method. Originally designed and exploited potential fields support not only collisions solving, but goal profiled attraction and camera manoeuvring as well. It works both in static and dynamic environments. It can be easily boosted by the GPU approach and eventually can be easily adapted for advanced or novice interface users for a miscellaneous navigation task completion.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2013, 61, 4; 871-884
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ocena poziomu koncentracji potencjału rozwojowego regionów w Polsce. Pomiar, klasyfikacja i ocena wpływu
Assessment of the Level of Concentration of Regional Development Potential in Poland. Measurement, Classification and Assessment of Influence
Autorzy:
Nadolny, Michał
Powiązania:
https://bibliotekanauki.pl/articles/2021383.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Concentration of development potential
gross domestic product
innovation
Źródło:
Studia komitetu przestrzennego zagospodarowania kraju PAN; 2018, 184; 166-182
0079-3507
Pojawia się w:
Studia komitetu przestrzennego zagospodarowania kraju PAN
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The impact of experimental manipulation of body schema on creative potential in mid-adolescence
Autorzy:
Mirucka, Beata
Kisielewska, Monika
Powiązania:
https://bibliotekanauki.pl/articles/2128996.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
body schema
creative potential
mid-Adolescence
experimental manipulation
Opis:
The study explored the impact of experimental manipulation of body schema on creative potential in mid-adolescence. The experiment was conducted in a group of 140 adolescents at the age of 14-16: 68 boys (M = 15.03; SD = .93) and 72 girls (M = 15.01; SD = .81), randomly allocated to equinumerous groups: experimental and control. The aim of experimental manipulation was to obtain a temporarily disturbance of body schema. It was gained by the use of glasses reversing the field of vision in the vertical up/down plane, and measured by the Body Schema Disturbance Questionnaire. In both groups the Urban and Jellen’s Test for Creative Thinking – Drawing Production (TCT-DP, Urban & Jellen, 1986) was administered twice (in A and B versions, randomly selected). Statistical analyses was run with a mixed model ANOVA (2 drawings x 2 groups x 2 sexes). The interaction effect of drawing production and group assignment on creative potential was significant, while the interaction effect of drawing production and sex on creative potential turned out to be insignificant.
Źródło:
Polish Psychological Bulletin; 2020, 51, 4; 295-304
0079-2993
Pojawia się w:
Polish Psychological Bulletin
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A universal model for solar radiation exergy accounting: Case study of Tunisia
Autorzy:
Daghsen, Khaoula
Lounissi, Dorra
Bouaziz, Nahla
Powiązania:
https://bibliotekanauki.pl/articles/2091371.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
solar energy
radiation
exergy radiation
exergy potential
regression
Opis:
The global solar radiation is the origin for all environmental processes on the earth and the majority of energy sources are derived from it. The data of solar radiation are required for the design and the study of solar application systems. The more important is the quality of the solar radiation which is defined by the maximum work can be provided by the solar radiation. This quality is measured by the exergy content of a solar radiation. In the present work, a universal pattern has been built to provide a prediction of solar exergy dependently to the geographic location. Fitting models have been developed for exergy account depending on geographic location, based on the linear, quadratic, cubic, logarithmic, exponential, power regression. The Petela model is adopted from literature for exergetic efficiency accounting of solar radiation. The global solar radiation according to ASHRAE model is expressed dependently of the cosine of zenith angle. The developed model is applied on Tunisia regions to predict exergy solar potential. The studied regions are classified regarding the exergy account, high, medium and low solar exergy locations. Results show that generally the solar radiation shows a low degree of exergy content, about 7% of difference.
Źródło:
Archives of Thermodynamics; 2022, 43, 2; 97--118
1231-0956
2083-6023
Pojawia się w:
Archives of Thermodynamics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Control of Natural Zeolite Properties by Mechanical Activation in Stirred Media Mill
Autorzy:
Bohács, K.
Faitli, J.
Bokányi, L.
Mucsi, G.
Powiązania:
https://bibliotekanauki.pl/articles/353482.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
zeolite
mechanical activation
zeta-potential
suspension rheology
FTIR
Opis:
Due to the special characteristics of zeolites, they can be applied in a very wide range of industries, i.e. agricultural, environmental or water treatment purposes. Generally, high added value zeolite products are manufactured by micro- or nanogrinding. However, these processes require high energy input and cause significant wearing of the mill parts. Therefore, the optimization of zeolite grinding, as well as the control of its properties are of a great importance. In the present paper a Hungarian natural zeolite was mechanically activated in stirred media mill for various residence times in distilled water, meanwhile the particle size distribution and the grinding energy were measured. Additionally, on-line tube rheometer was used to study the rheology of the suspension during the grinding process. The particle interaction and the suspension aggregation stability were detected by zeta-potential measurements. Structural changes due to the mechanical activation process were monitored by FTIR. It was found that the material structure of the zeolite, as well as the rheological behaviour of the zeolite suspension and its aggregation stability had been altered due to the mechanical activation in the stirred media mill. It can be concluded that the zeolite product properties can be modified by mechanical activation in order to produce a high added value tailored material.
Źródło:
Archives of Metallurgy and Materials; 2017, 62, 2B; 1399-1406
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Anther culture ability of spring rye (Secale cereale L.) cultivars
Autorzy:
Mikolajczyk, S.
Broda, Z.
Galczynska, A.
Marut, J.
Powiązania:
https://bibliotekanauki.pl/articles/951281.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
spring rye
Secale cereale
pollination
androgenesis
regeneration
plant potential
Źródło:
BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology; 2015, 96, 1
0860-7796
Pojawia się w:
BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Model of the two well potential for Hg-atoms in the Hg1-xCdxTe alloy lattice
Autorzy:
Polit, J.
Powiązania:
https://bibliotekanauki.pl/articles/200135.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
well potential
Hg-atoms
Hg1-xCdxTe alloy lattice
Opis:
The problem of the additional phonon modes (APM) of the far infrared spectra in the range of 100–115 cm-1 for the Hg1-xCdxTe alloys has been discussed for the last forty years. The model of two well potential of the mercury atoms in the Hg1-xCdxTe lattice is proposed for interpretation of these APM. Analysis was performed for samples of different compositions (0.06 < x < 0.7) and different types (nand p-type) of conductivity.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2011, 59, 3; 331-341
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Evaluation of allelopathic potential of safflower genotypes (Carthamus tinctorius L.)
Autorzy:
Motamedi, M.
Karimmojeni, H.
Sini, F.G.
Powiązania:
https://bibliotekanauki.pl/articles/66277.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
allelopathic potential
safflower
genotype
Carthamus tinctorius
drought stress
radish
Opis:
Forty safflower genotypes were grown under normal irrigation and drought stress. In the first experiment, the allelopathic potential of shoot residues was evaluated using the sandwich method. Each genotype residue (0.4 g) was placed in a sterile Petri dish and two layers of agar were poured on that. Radish seeds were placed on agar medium. The radish seeds were cultivated without safflower residues as the controls. The length of the radicle, hypocotyl, and fresh biomass weight and seed germination percentages were measured. A pot experiment was also done on two genotypes with the highest and two with the lowest allelopathic activity selected after screening genotypes in the first experiment. Before entering the reproductive phase, irrigation treatments (normal irrigation and drought stress) were applied. Shoots were harvested, dried, milled and mixed with the topsoil of new pots and then radish seeds were sown. The pots with safflower genotypes were used to evaluate the effect of root residue allelopathy. The shoot length, fresh biomass weight, and germination percentage were measured. Different safflower genotypes showed varied allelopathic potential. The results of the first experiment showed that Egypt and Iran-Khorasan genotypes caused maximum inhibitory responses and Australia and Iran-Kerman genotypes resulted in minimum inhibitory responses on radish seedling growth. Fresh biomass weight had the most sensitivity to safflower residues. The results of the pot experiment were consistent with the results of in vitro experiments. Residues produced under drought stress had more inhibitory effects on the measured traits. Safflower root residue may have a higher level of allelochemicals or different allelochemicals than shoot residue.
Źródło:
Journal of Plant Protection Research; 2016, 56, 4
1427-4345
Pojawia się w:
Journal of Plant Protection Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of Various Organic Additives in Galvanic Bath on Properties of Ni-SiC Composite Coatings
Autorzy:
Nowak, M.
Mizera, J.
Kłyszewski, A.
Dobkowska, A.
Boczkal, S.
Kozik, A.
Koprowski, P.
Powiązania:
https://bibliotekanauki.pl/articles/357020.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
organic additives
SiC
composite coatings
nickel coatings
zeta potential
Opis:
The paper presents the results of the electrodeposition of nickel composite coatings reinforced with the ceramic SiC particles. A Watts type galvanic bath modified with various organic additives was used. These additives were: 2-sulfobenzoic acid imide (LSA), dioctyl sulfosuccinate sodium salt (DSS), sodium dodecyl sulfate (SDS), tris (hydroxymethyl) aminomethane (THAM) and hexamethyldisilizane (HMDS). The nickel composite coating was electrodeposited on a 2xxx aluminum alloy series substrate (EN-AW 2017) with zinc interlayer. Studies concerned the effect of the applied organic additives on properties of composite coatings such as: microstructure, microhardness, adhesion to the substrate, corrosion resistance and roughness. The structure of the coatings was assessed by scanning electron microscopy and light microscopy. Based on the studies of zeta potential it was found that the bath modification had a significant impact on the amount of the ceramic phase embedded in metal matrix. The tests conducted in a model 0.01 M KCl solution were not fully representative of the true behavior of particles in a Watts bath.
Źródło:
Archives of Metallurgy and Materials; 2019, 64, 4; 1327-1333
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Nickel Composite Coatings Reinforced Nano SiC Particles
Autorzy:
Nowak, M.
Mizera, J.
Kłyszewski, A.
Dobkowska, A.
Boczkal, S.
Kozik, A.
Koprowski, P.
Powiązania:
https://bibliotekanauki.pl/articles/356955.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
nanoparticles
organic additives
SiC
composite coatings
nickel coatings
zeta potential
Opis:
The paper presents the results of the electrodeposition of nickel composite coatings reinforced with the nano size SiC ceramic particles. The type and size of the ceramic particles or organic additives used play a important role during electrodeposition processes. A Watts type galvanic bath with various organic additives was used. These additives were: 2-sulfobenzoic acid imide, dioctyl sulfosuccinate sodium salt (DSS), sodium dodecyl sulfate, tris (hydroxymethyl) aminomethane and hexamethyldisilizane. The nickel composite coating was electrodeposited on a 2xxx aluminum alloy series substrate (EN-AW 2017) with zinc interlayer. The work concerns the determination of the impact of the change in the zeta potential of SiC nanoceramic particles used on properties of composite coatings (wear resistance, corrosion, etc.). The paper characterized the composite nickel coatings on aluminum alloy using SEM techniques, wear resistance tests by TABER method and coating adhesion to the substrate using the “scratch test” method. The corrosion resistance of coatings was also tested using electrochemical methods. The research allowed to determine the effect of SiC nanoceramic particle size on the value of the zeta potential in the model KCl solution.
Źródło:
Archives of Metallurgy and Materials; 2020, 65, 2; 935-940
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Research on topology of a novel three-phase four-leg fault-tolerant NPC inverter
Autorzy:
Zhang, Baoge
Ping, Shanyan
Long, Yyi
Jiao, Yyuemin
Wu, Bboxiang
Powiązania:
https://bibliotekanauki.pl/articles/2086722.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
fault tolerant operation
midpoint potential equilibrium
NPC inverter
topology reconstruction
Opis:
Diode neutral point clamped (NPC) three-level converters have been widely used in recent years. Aiming at the problems of the high device failure rate and unstable neutral point potential of NPC three-level converters, an NPC three-level circuit with fourth bridge arm redundancy is proposed based on the traditional NPC three-level converter. The redundant fourth bridge arm is used to realize the function of stabilizing voltage when there is no fault and replacing the fault half-bridge arm to maintain the continuous operation of the converter when there is a fault. By analyzing the working principle of space vector pulse width modulation (SVPWM) and the power loss of the switch, it is of particular significance to the design and control of NPC three-level converters in the future. Matlab/Simulink verifies the feasibility of the fault-tolerant circuit structure.
Źródło:
Archives of Electrical Engineering; 2022, 71, 2; 489--506
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Energy – conversion, conservation and management
Autorzy:
Badur, J.
Powiązania:
https://bibliotekanauki.pl/articles/175468.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
internal
kinetic and potential energy
energy fluxes
energy conservation
energy conversion
Opis:
Energy is an abstract notion that helps to understand the nature and contributes to the creation of the civilization. The energy notion has a huge meaning not only due to practical reason – it is essential for economy and philosophy too. It turns out that in Hellenic philosophy, and especially in its fundamental part, i.e., metaphysics, there is no place for the concepts and methods of reasoning developed by physics and chemistry. Philosophy assumes that most of the physical and chemical concepts are not known in nature in spe these are employed by science only as a kind of mental keys (qualitative occultea) for the description and understanding of the universe. The concept of energy is only one example of a notion accepted both by the philosophers (in its metaphysical sense) and physicians (in its descriptive role).
Źródło:
Transactions of the Institute of Fluid-Flow Machinery; 2015, 127; 27-43
0079-3205
Pojawia się w:
Transactions of the Institute of Fluid-Flow Machinery
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 74

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