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Wyświetlanie 1-15 z 744
Tytuł:
Design of a Dual-Polarization Dual-Wideband Planar Antenna
Autorzy:
A'isya Nur Aulia Yusuf
Fitri Yuli Zulkifli
Powiązania:
https://bibliotekanauki.pl/articles/2055241.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
planar antenna
dual wideband
dual polarization
Opis:
Wireless communication is a fundamental requirement because of its low cost, high flexibility and convenience, continuing improvements in speed and connectivity, and accessibility in remote areas. One example is very small aperture terminal (VSAT) communication. A VSAT is a two-way satellite ground station operating at C-band and Ku-band frequencies, with linear and circular polarization in the C band and linear polarization in the Ku band. For the data transmitted by a satellite to be utilized by a user, the antenna on the user side must have dual-wideband and dual-polarization characteristics. In this study, a dual-polarization planar dual-wideband antenna with dimensions of 30 x 39 x 1.52 mm3 was designed using a dual-port approach. The introduction of a slot and perturbation on the patch side results in the dual-wideband characteristics of the antenna. The introduction of slots into the antenna ground results in circular polarization. The proposed antenna has resonant frequencies of 3 - 15 GHz on port 1 and 3.31 – 7.79 GHz and 9.05 – 15 GHz on port 2, with circular polarization characteristics on port 1 and linear polarization characteristics on port 2. On port 1, the gains at frequencies of 4.2 GHz is 3.93 dB, while on port 2, the gains at frequencies of 3.9 GHz is 0.51 dB.
Źródło:
International Journal of Electronics and Telecommunications; 2022, 68, 1; 41--46
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Thermodynamic analysis of a new dual evaporator CO2 transcritical refrigeration cycle
Autorzy:
Abdellaoui, E. Y.
Kairouani, L. K.
Powiązania:
https://bibliotekanauki.pl/articles/240198.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
CO2
energy
refrigeration
ejector
exergy
energia
chłodzenie
ejektor
egzergia
Opis:
In this work, a new dual-evaporator CO2 transcritical refrigeration cycle with two ejectors is proposed. In this new system, we proposed to recover the lost energy of condensation coming off the gas cooler and operate the refrigeration cycle ejector free and enhance the system performance and obtain dual-temperature refrigeration simultaneously. The effects of some key parameters on the thermodynamic performance of the modified cycle are theoretically investigated based on energetic and exergetic analysis. The simulation results for the modified cycle indicate more effective system performance improvement than the single ejector in the CO2 vapor compression cycle using ejector as an expander ranging up to 46%. The exergetic analysis for this system is made. The performance characteristics of the proposed cycle show its promise in dual-evaporator refrigeration system.
Źródło:
Archives of Thermodynamics; 2017, 38, 1; 39-62
1231-0956
2083-6023
Pojawia się w:
Archives of Thermodynamics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modeling of Passively Synchronized Dual Wavelength Q-Switched rm $Nd^{3+}:YVO_4$ Lasers
Autorzy:
Abdul Ghani, B.
Hammadi, M.
Powiązania:
https://bibliotekanauki.pl/articles/1419741.pdf
Data publikacji:
2012-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
42.55.Rz
42.60.Gd
87.19.lm
Opis:
A mathematical model describing the sum frequency generation of passively synchronized Q-switched pulses simultaneously emitted from two separate $Nd^{3+}:YVO_4$ lasers has been demonstrated. This model describes the temporal behavior of the output pulses, and studies the impact of the pumping energy variation on the characteristics of these pulses (output power, pulse separation, pulse widths, delay time). $V^{3+}:YAG$ and $Cr^{4+}:YAG$ saturable absorbers and a periodically poled KTP crystal are used to achieve and improve the synchronization of the emitted 1342 nm and 1064 nm wavelengths. The synchronization process generates pulsed yellow light with 593.5 nm wavelength, and it can be realized through adjusting the pumping energy of the gain media.
Źródło:
Acta Physica Polonica A; 2012, 122, 1; 103-108
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
You are so kind – and I am kind and smart: Actor – Observer Differences in the Interpretation of On-going Behavior
Autorzy:
Abele, Andrea E.
Bruckmüller, Susanne
Wojciszke, Bogdan
Powiązania:
https://bibliotekanauki.pl/articles/430804.pdf
Data publikacji:
2014-12-01
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
actor-observer differences
agency
communion
dual perspective model
Opis:
: The dual perspective model of agency and communion predicts that observers tend to interpret a target’s behavior more in terms of communion than agency, whereas actors interpret their behavior more in terms of agency. The present research for the first time tests this model in real interactions. Previously unacquainted participants had a short conversation and afterwards rated their own behavior (actor perspective) and their interaction partner’s behavior (observer perspective) in terms of agency(self-confident, assertive) and communion(trustworthy, empathic). Supporting the dual perspective model, observers rated the actor’s behavior higher on communion than on agency, and higher on communion than actors themselves did. Findings for actors were more complex: Actors rated their own behavior as more agentic than observers did. However, they also rated their behavior high on communion. We discuss implications for the dual perspective model as well as for (mis)understandings in social interactions.
Źródło:
Polish Psychological Bulletin; 2014, 45, 4; 394-401
0079-2993
Pojawia się w:
Polish Psychological Bulletin
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Development of anthropomorphic dual arm robot with distinct degrees of freedom for coordinated operations
Autorzy:
Abhaykrishna, K. M.
Parayil, Nidhi Homey
Reghunandan, Ibin Menon
Sudheerx, Sudheer A. P.
Powiązania:
https://bibliotekanauki.pl/articles/385000.pdf
Data publikacji:
2019
Wydawca:
Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Automatyki i Pomiarów
Tematy:
dual arm robot
anthropomorphic ratio
distinct degrees of freedom
coordination
object detection
Opis:
Development of assistive robots for helping the disabled is a field of research that has gathered attention recently. According to surveys, about one billion people in the world population have some kind of disability. Dual arm robots are a suitable solution for helping people with mobility impairments. The current development in the field of dual-arm robots is focused mainly in the industrial field to carry out cyclic tasks. This includes activities such as pick and place, assembling parts and doing other industrial operations. Unlike human arms, these dual arm robots lack versatility in doing a wide variety of tasks with adequate coordination between the arms. Due to these constraints, industrial dual arm robots cannot be directly implemented for assisting the disabled. This paper focuses on designing a compact dual arm robot which closely mimics human arms to do coordinated tasks with lesser Degrees of Freedom (DoF). Therefore, the developed robot extends its capabilities from industrial applications to daily life activities. Closed loop control is used in actuating the proposed 9 DoF dual arm robot with distinct DoF. Target position is acquired using image processing. Hand to hand coordination in various operations such as pick and place, transferring objects, serving food, etc. has successfully experimented.
Źródło:
Journal of Automation Mobile Robotics and Intelligent Systems; 2019, 13, 4; 52-64
1897-8649
2080-2145
Pojawia się w:
Journal of Automation Mobile Robotics and Intelligent Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An Investigation of the Linkage between Relationship Status (Single vs. Partnered), Identity Dimensions and Self-construals in a Sample of Polish Young Adults
Autorzy:
Adamczyk, Katarzyna
Luyckx, Koen
Powiązania:
https://bibliotekanauki.pl/articles/430314.pdf
Data publikacji:
2015-12-01
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
dual-cycle model of identity formation
independent self-construal
interdependent self-construal
single
partnered
young adults
Opis:
The aim of this exploratory cross-sectional study was to examine the associations among relationship status, identity processes, and self-construals among Polish young adults. The theoretical framework of the study consisted of Erikson’s psychosocial theory of human development (Erikson, 1963; 1968; 1980), the dual-cycle model of identity formation (Luyckx, Goossens, & Soenens, 2006), and the concept of independent and interdependent self-construals. A total of 291 university students (155 females and 136 males) aged 20-25 completed the Dimensions of Identity Development Scale (DIDS; Luyckx, Schwartz et al., 2008) (Polish adaptation - Brzezińska & Piotrowski, 2010a) and Self-Construal Scale (SCS; Singelis, 1994) (Polish adaptation - Pilarska, 2014). Results showed that single individuals scored higher on exploration in breadth, exploration in depth, and ruminative exploration, and lower on commitment making and identification with commitment than did partnered individuals. Further, single and partnered individuals did not differ in the area of independent and interdependent self-construals. Discriminant function analysis revealed that especially ruminative exploration and exploration in breadth were important variables for discriminating single from partnered status.
Źródło:
Polish Psychological Bulletin; 2015, 46, 4; 616-623
0079-2993
Pojawia się w:
Polish Psychological Bulletin
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Vertex coloring the square of outerplanar graphs of low degree
Autorzy:
Agnarsson, Geir
Halldórsson, Magnús
Powiązania:
https://bibliotekanauki.pl/articles/744076.pdf
Data publikacji:
2010
Wydawca:
Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
Tematy:
outerplanar
chromatic number
power of a graph
weak dual
Opis:
Vertex colorings of the square of an outerplanar graph have received a lot of attention recently. In this article we prove that the chromatic number of the square of an outerplanar graph of maximum degree Δ = 6 is 7. The optimal upper bound for the chromatic number of the square of an outerplanar graph of maximum degree Δ ≠ 6 is known. Hence, this mentioned chromatic number of 7 is the last and only unknown upper bound of the chromatic number in terms of Δ.
Źródło:
Discussiones Mathematicae Graph Theory; 2010, 30, 4; 619-636
2083-5892
Pojawia się w:
Discussiones Mathematicae Graph Theory
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Cyberparki jako hybrydowe przestrzenie uczenia się: rozważania na marginesie projektu COST
Autorzy:
Agnieszka, Kruszwicka,
Michał, Klichowski,
Powiązania:
https://bibliotekanauki.pl/articles/892536.pdf
Data publikacji:
2019-04-29
Wydawca:
Uniwersytet Warszawski. Wydawnictwa Uniwersytetu Warszawskiego
Tematy:
public green spaces
outdoor learning
technology-enhanced learning
dual-task costs
smartphone
Opis:
CyberParks will be hybrid spaces of future cities. Learning in CyberParks will take the form of technology-enhanced outdoor learning and will become an important concept that can be used in practice in order to provide an answer to numerous problems of educational institutions, related to students’ lack of contact with nature and consolidation of their sedentary lifestyle. In this paper we discuss evidences from the CyberParks COST project and we present recommendations regarding the constructions of CyberParks. We point out, for example, that when designing CyberParks one has to think not only about the technological infrastructure, but also about making sitting spots for using learning technology. We also present the original project of such an object.
Źródło:
Kwartalnik Pedagogiczny; 2019, 64(1(251)); 71-83
0023-5938
Pojawia się w:
Kwartalnik Pedagogiczny
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Topological dual of $B_∞(I, ₁(X,Y))$ with application to stochastic systems on Hilbert space
Autorzy:
Ahmed, N.
Powiązania:
https://bibliotekanauki.pl/articles/729390.pdf
Data publikacji:
2009
Wydawca:
Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
Tematy:
representation theory
topological dual
finitely additive operator-valued measures
polish space
Hilbert space
stochastic systems
structural control
uncertainty abatement
Opis:
In this paper, we prove that the topological dual of the Banach space of bounded measurable functions with values in the space of nuclear operators, furnished with the natural topology, is isometrically isomorphic to the space of finitely additive linear operator-valued measures having bounded variation in a Banach space containing the space of bounded linear operators. This is then applied to a stochastic structural control problem. An optimal operator-valued measure, considered as the structural control, is to be chosen so as to minimize fluctuation (volatility). Both existence of optimal policy and necessary conditions of optimality are presented including a conceptual algorithm.
Źródło:
Discussiones Mathematicae, Differential Inclusions, Control and Optimization; 2009, 29, 1; 67-90
1509-9407
Pojawia się w:
Discussiones Mathematicae, Differential Inclusions, Control and Optimization
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Extension of several sufficient conditions for Hamiltonian graphs
Autorzy:
Ainouche, Ahmed
Powiązania:
https://bibliotekanauki.pl/articles/744192.pdf
Data publikacji:
2006
Wydawca:
Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
Tematy:
hamiltonian graph
dual closure
neighborhood closure
Opis:
Let G be a 2-connected graph of order n. Suppose that for all 3-independent sets X in G, there exists a vertex u in X such that |N(X∖{u})|+d(u) ≥ n-1. Using the concept of dual closure, we prove that
1. G is hamiltonian if and only if its 0-dual closure is either complete or the cycle C₇
2. G is nonhamiltonian if and only if its 0-dual closure is either the graph $(K_r ∪ Kₛ ∪ Kₜ) ∨ K₂$, 1 ≤ r ≤ s ≤ t or the graph $((n+1)/2)K₁ ∨ K_{(n-1)/2}$.
It follows that it takes a polynomial time to check the hamiltonicity or the nonhamiltonicity of a graph satisfying the above condition. From this main result we derive a large number of extensions of previous sufficient conditions for hamiltonian graphs. All these results are sharp.
Źródło:
Discussiones Mathematicae Graph Theory; 2006, 26, 1; 23-39
2083-5892
Pojawia się w:
Discussiones Mathematicae Graph Theory
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Variations on a sufficient condition for Hamiltonian graphs
Autorzy:
Ainouche, Ahmed
Lapiquonne, Serge
Powiązania:
https://bibliotekanauki.pl/articles/743758.pdf
Data publikacji:
2007
Wydawca:
Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
Tematy:
cycles
partially square graph
degree sum
independent sets
neighborhood unions and intersections
dual closure
Opis:
Given a 2-connected graph G on n vertices, let G* be its partially square graph, obtained by adding edges uv whenever the vertices u,v have a common neighbor x satisfying the condition $N_G(x) ⊆ N_G[u] ∪ N_G[v]$, where $N_G[x] = N_G(x) ∪ {x}$. In particular, this condition is satisfied if x does not center a claw (an induced $K_{1,3}$). Clearly G ⊆ G* ⊆ G², where G² is the square of G. For any independent triple X = {x,y,z} we define
σ̅(X) = d(x) + d(y) + d(z) - |N(x) ∩ N(y) ∩ N(z)|.
Flandrin et al. proved that a 2-connected graph G is hamiltonian if [σ̅]₃(X) ≥ n holds for any independent triple X in G. Replacing X in G by X in the larger graph G*, Wu et al. improved recently this result. In this paper we characterize the nonhamiltonian 2-connected graphs G satisfying the condition [σ̅]₃(X) ≥ n-1 where X is independent in G*. Using the concept of dual closure we (i) give a short proof of the above results and (ii) we show that each graph G satisfying this condition is hamiltonian if and only if its dual closure does not belong to two well defined exceptional classes of graphs. This implies that it takes a polynomial time to check the nonhamiltonicity or the hamiltonicity of such G.
Źródło:
Discussiones Mathematicae Graph Theory; 2007, 27, 2; 229-240
2083-5892
Pojawia się w:
Discussiones Mathematicae Graph Theory
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Horvitz-Thompson estimator based on theauxiliary variable
Autorzy:
Al-Jararha, J.
Sulaiman, Mazen
Powiązania:
https://bibliotekanauki.pl/articles/1358405.pdf
Data publikacji:
2020-03-23
Wydawca:
Główny Urząd Statystyczny
Tematy:
Horvitz-Thompson Estimator
Stratified Sampling Designs
Dual Calibration
GREG Type Estimator
Opis:
In this paper, the Horvitz and Thompson (1952) estimator will be modified; so that, the modified estimators will use the availability of the auxiliary variable. Furthermore, the modified estimators are extended to be used in stratified sampling designs. Empirical studies are given for comparison purposes.
Źródło:
Statistics in Transition new series; 2020, 21, 1; 37-54
1234-7655
Pojawia się w:
Statistics in Transition new series
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dual Application of Al-Kheriat of Removal of Arsenic from Aqueous Solution and Acting as Rodenticide
Autorzy:
Al-Jendeel, Haider Abdulkareem
Rasheed, Hala Abdulkareem
Ahmedzeki, Nada Sadoon
Alhassani, Maha Hadi
Powiązania:
https://bibliotekanauki.pl/articles/24201659.pdf
Data publikacji:
2023
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
arsenic
biosorbent
rodenticide
green process
Al-Kheriat
liver enzyme
Opis:
Arsenic is a prevalent and pervasive environmental contaminant with varied amounts in drinking water. Arsenic exposure causes cancer, cardiovascular, liver, nerve, and ophthalmic diseases. The current study aimed to find the best conditions for eliminating arsenic from simulated wastewater and their effect on biomarkers of hepatic in mice. Adsorption tests including pH, contact duration, Al-kheriat dosage, and arsenic concentrations were evaluated. Seventy-two healthy albino mice (male) were accidentally allocated into nine groups (n = 8), the first group was considered as healthy control, the second group (AL-Kheriat), and other groups received AL-Kheriat and arsenic 25, 50, 75, 100, 125, 150 and 175 mg/kg, respectively. Next 10 days, the following were examined: LD50 level, ALP (alkaline phosphatase), ALT (alanine aminotransferase), and AST (aspartate aminotransferase), besides the histological condition of the liver. The results showed that the best time for arsenic removal was 4 hours, pH 8, Alkheriat dose 1 gram, and 50 ppm of pollutants. The level of alkaline phosphatase ALP, alanine transaminase ALT, and aspartate transaminase AST was increased to 150.96 (U/L), 143.1(U/L), and 32.8(U/L), respectively, in Al-Khriet and arsenic exposed population than the healthy control group, When the appropriate dose of Al-Khriet and arsenic mixture is used, it can aid in the selection of a safe way of disposing of the adsorbed residue. Additionally, it can serve as a low-cost rodent pesticide, increasing the commercial viability of this removal strategy.
Źródło:
Journal of Ecological Engineering; 2023, 24, 4; 16--26
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Perturbation Element Effect on Frequency Stability in Dual Mode Reconfigurable Filters Based on Circular Microstrip Ring Resonators
Autorzy:
Albahnassi, Muhammad Haitham
Malki, Adnan
Almekdad, Shokri
Powiązania:
https://bibliotekanauki.pl/articles/227210.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
dual mode ring resonators
dual-mode filters
perturbation element arrangement
BW reconfigurability
Opis:
A detailed study about the suitable perturbation element shape and location for tunable BW dual mode microstrip filter which has circular ring resonator is presented. BW tuning is achieved by resonator geometry modification. The study explains the effect of a perturbation element on the stability of the center frequency during BW tuning. Different cases have been studied for two shapes of perturbation element; which one is a rectangular and the other is a radial. The treated cases discuss whether the perturbation element is located in the inner or in the outer circumference of the ring, and whether it is a patch or a notch. BW tuning simulation treated the case of FBW3dB increase for two and three times. The best case of perturbation element which has the best center frequency stability has been modeled, simulated, and fabricated at 2.4 GHz. Geometry modification of the filter took into account the RF MEMS modeling. The filter has an elliptic frequency response, and its FBW has been increased in five steps from 1.7% to 5%. The designed filters were evaluated experimentally and by simulation with very good agreement.
Źródło:
International Journal of Electronics and Telecommunications; 2019, 65, 4; 731-737
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Residence time distribution model of dual phase fluid flow in the mixer settler
Model RTD (Rozkład Czasu Przebywania) do opisu dwufazowego przepływy w osadniku
Autorzy:
Alizadeh, M.
Hosseinzadeh, M.
Powiązania:
https://bibliotekanauki.pl/articles/317994.pdf
Data publikacji:
2013
Wydawca:
Polskie Towarzystwo Przeróbki Kopalin
Tematy:
simulation
RTD model
RTDWEN
MATLAB
mixer settler
symulacja
model RTD
rozkład czasu przebywania
RTDWEN – oprogramowanie
Matlab
osadnik
Opis:
In this study, the residence time distribution of the fluid stream in a mixer settler was simulated in order to achieve the optimal extraction time and the best performance. The aqueous and organic phases were water and kerosene, respectively; and the salt tracer changes were recording continuously by using a conductivity meter. Initially, experiments were performed at different mixing times in the phase ratio of 1:1. Then, results were analyzed applying Matlab software and Weller and N-Mixer models in RTDWEN software. Finally, for the mixing period of 5 min, the mean residence time was obtained 4.86 min by Matlab, and 6.44 and 6.62 min by RTDWEN, respectively for Weller and N-Mixer models. Furthermore, setting the mixing period at 5 min, the effect of mixer settler units was investigated by using N-Mixer model, and it was found that it was beneficial to increase the number of units, and set the residence time distribution close to extraction time at 6 min. It was also shown that under these conditions, the removed material from the mixer before the mean residence time was minimum, and both phases have an enough time for mixing and settling.
W badaniu zasymulowano rozkład czasu przebywania strumienia płynu w osadniku w celu osiągnięcia optymalnego czasu ekstrakcji i najlepszej wydajności procesu. Fazami wodnymi i organicznymi były odpowiednio woda i nafta; zmiany wskaźnika kwasowości były rejestrowane w sposób ciągły dzięki użyciu konduktometru. Początkowo eksperymenty przeprowadzano przy różnych czasach mieszania przy stosunku faz 1:1. Następnie wyniki analizowano stosując środowisko programu Matlab oraz modele Weller i N-Mixer w programie RTDWEN. Finalnie, dla czasu mieszania wynoszącego 5 minut, otrzymano 4,86 min w programie Matlab oraz 6,44 i 6,62 min w programie RTDWEN odpowiednio dla modeli Weller i N-Mixer. Co więcej, po ustawieniu czasu mieszania na 5 min badano efekt jednostek osadnika przez użycie modelu N-Mixer i dowiedziono, że korzystne było zwiększenie liczby jednostek oraz nastawienie czasu rozkładu zbliżonego do czasu ekstrakcji wynoszącego 6 min. Pokazano również, że w tych warunkach materiał usunięty z mieszalnika zanim właściwy czas przebywania był minimalny, a obie fazy miały wystarczająco dużo czasu na mieszanie i osadzanie.
Źródło:
Inżynieria Mineralna; 2013, R. 14, nr 2, 2; 25-30
1640-4920
Pojawia się w:
Inżynieria Mineralna
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 744

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