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Wyszukujesz frazę "5G" wg kryterium: Wszystkie pola


Tytuł:
“The 5G files” – the movement to combat the introduction of fifth generation telephony – radicalization around one issue or element
Autorzy:
Witkowski, Przemysław
Powiązania:
https://bibliotekanauki.pl/chapters/11207473.pdf
Data publikacji:
2023-06-28
Wydawca:
Collegium Civitas
Tematy:
COVID-19
Plandemia
5G
Anti-Enlightenment
Conspiracy Theories
Opis:
The Enlightenment and its values, such as naturalism, rationalism, humanistic and cognitive optimism, faith in progress, criticism, empiricism, sensualism and utilitarianism, are coming under increasing fire from social and political movements. One strand of this attack is anti-science protest movements, for example against vaccination and fifth-generation telephony. This text is an attempt to consider whether anti-5G activity can be considered a politically radicalized movement, and if so, whether it is focused solely on one issue or part of a larger wave. The article shows the roots and content of conspiracy theories related to the fight against 5G, as well as the structure, goals, and activities of the Polish part of this movement.
Źródło:
The Virus of Radicalization; 123-158
9788366386334
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
$\text{}^{7}$F$\text{}_{6}$(Γ$\text{}_{1g}$) → (Γ$\text{}_{1g}$)$\text{}^{5}$D$\text{}_{4}$ Two-Photon Transition of Tb$\text{}^{3+}$ in Cs$\text{}_{2}$NaTbCl$\text{}_{6}$
Autorzy:
Chua, M.
Tanner, P. A.
Powiązania:
https://bibliotekanauki.pl/articles/1945539.pdf
Data publikacji:
1996-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
33.80.Wz
33.20.Kf
33.70.Fd
Opis:
Two-photon spectroscopy has expanded the scope of studies of excited states of ions and has also enabled the examination of the validity of conventional theories. In this study, the direct theoretical calculation of the two-photon intraconfigurational crystal field transitions of $\text{}^{7}$F$\text{}_{6}$(Γ$\text{}_{1g}$) → $\text{}^{5}$D$\text{}_{4}$ of Tb$\text{}^{3+}$ in Cs$\text{}_{2}$NaTbCl$\text{}_{6}$ has been performed, based on third-order perturbation theory including electric dipoles and spin-orbit coupling. The core 4f$\text{}^{7}$ ($\text{}^{8}$S $\text{}_{7}\text{}_{/}\text{}_{2}$ Γ$\text{}_{6}$, Γ$\text{}_{7}$, Γ$\text{}_{8}$) and 4f$\text{}^{7}$($\text{}^{6}$P $\text{}_{7}\text{}_{/}\text{}_{2}$ Γ$\text{}_{6}$, Γ$\text{}_{7}$, Γ$\text{}_{8}$) states coupled with 5d(Γ$\text{}_{3}$, Γ$\text{}_{5}$) are taken as the intermediate states. The calculated transition intensity ratios are in good agreement with the experimental results. In particular the two-photon transition $\text{}^{7}$F$\text{}_{6}$(Γ$\text{}_{1g}$) → ( Γ$\text{}_{1g}$)$\text{}^{5}$D$\text{}_{4}$ is allowed in third-order perturbation instead of the proposed fourth-order process by Ceulemans et al. using the Judd-Pooler-Downer model. The inconsistency between the two studies arises from the failure of application of the Judd-Ofelt closure approximation. The closure approximation does not only simplify the two-photon calculation but also sacrifices the physical accuracy by changing the selection rule of the two-photon transition from that of two electric dipole transitions to that of one electric quadrupole transition.
Źródło:
Acta Physica Polonica A; 1996, 90, 1; 169-180
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
5G New Business Opportunities – New Business Models, Pricing, and Use Cases
Autorzy:
McCarthy-Ward, Peter
Valdar, Andy
Newstead, Stuart
Revell, Stuart
Powiązania:
https://bibliotekanauki.pl/articles/1839464.pdf
Data publikacji:
2021
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
5G services
business challenges
infrastructure
Opis:
This paper addresses how network operators may gain a reasonable return on their investment into 5G infrastructure. It first considers the 5G mobile network costs structure then applies this to three typical use cases.
Źródło:
Journal of Telecommunications and Information Technology; 2021, 2; 79-84
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
5G technologies in intelligent transport systems - architectures, virtualization and network slicing
Autorzy:
Gajewski, S.
Powiązania:
https://bibliotekanauki.pl/articles/393393.pdf
Data publikacji:
2019
Wydawca:
Polskie Stowarzyszenie Telematyki Transportu
Tematy:
5G
network slicing
ITS
5G architecture
krojenie sieci
architektura 5G
Opis:
In the paper, 5G communication technologies implemented for Intelligent Transport Systems are discussed. Firstly, the essence of the 5G system concept is presented, and the problem of network functions virtualization (NFV) is analyzed. Moreover, the principle of virtualization is explained. Secondly, the analysis of network slicing is performed, from the point of view of transport systems implementation in the future 5G networks. The important part is the analysis of architecture proposals for the 5G communications system, implemented as ITS, for various scenarios of its work. The aim of this paper is the study on practice architecture of the 5G communication network for the ITS system, introduced as physical radio-informatics system implementation.
Źródło:
Archives of Transport System Telematics; 2019, 12, 1; 9-16
1899-8208
Pojawia się w:
Archives of Transport System Telematics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A 30 GHz Slotted Bow-Tie Rectangular Patch Antenna Design for 5G Application
Autorzy:
Mohammed, Khazini
Mehdi, Damou
Zeggai, Souar
Powiązania:
https://bibliotekanauki.pl/articles/27311933.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:
slotted bow-tie patch antenna
quarter wave transformer
array antenna
CST studio
ADS 2016
Opis:
This Article presented the study of a single pacth antenna and array patch antenna. We will focus on the design based on a small size at a resonant frequency of 30GHz. using the software CST Microwave Studio (FEM method) and ADS software (Moments method) to find internal parameters (S... parameters, bandwidth ,VSWR) and external characteristics (gain, directivity and radiation pattern, efficiencies). To increase the total gain of the antenna and to have a wider bandwidth band width and taking advantage of the functionality of the radiation overlap of several elements radiating in the same direction, we suggest the second and most important step to design a most important step to design an antenna array grouping patches identical to our first patch antenna proposed in first patch antenna proposed in the first step.
Źródło:
International Journal of Electronics and Telecommunications; 2023, 69, 4; 669--673
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A CPW-fed Sigma-shaped MIMO Antenna for Ka Band and 5G Communication Applications
Autorzy:
Madhav, B. T. P.
Devi, G. J.
Lakshman, P.
Anilkumar, T.
Powiązania:
https://bibliotekanauki.pl/articles/309564.pdf
Data publikacji:
2018
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
5G
coplanar waveguide
Ka band
MIMO
satellite downlink
Opis:
This article presents a MIMO compact antenna measuring 45×45×1.6 mm, on the FR4 substrate, proposed for Ka band and 5G communication applications. The proposed design is suitable to overcome the issues connected with massive MIMO. It has four-sigma-shaped radiating elements and a c-shaped ground plane with coplanar waveguide feeding. Its compact dimensions suit it for most existing communications systems. The aerial operates in the 21–30 GHz range, which covers Ka and 5G communication bands. The proposed antenna exhibits the average efficiency of more than 76% within its operating band and gives a minimum signal to noise plus interference ratio. The presented antenna covers several services, such as Ka band satellite downlink applications and future 5G communication applications.
Źródło:
Journal of Telecommunications and Information Technology; 2018, 4; 97-106
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A Facile Synthesis of 3,3'-Dinitro-5,5'-diamino-bi-1,2,4-triazole and a Study of Its Thermal Decomposition
Autorzy:
Ma, Q.
Lu, H.
Qu, Y.
Liao, L.
Li, J.
Fan, G.
Chen, Y.
Powiązania:
https://bibliotekanauki.pl/articles/358272.pdf
Data publikacji:
2017
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
Tematy:
3,3’-dinitro-5,5’-diamino-bi-1,2,4-triazole
facile synthesis
DSC-TG
RSFTIR
TG-IR
thermolysis
Opis:
3,3’-Dinitro-5,5’-diamino-bi-1,2,4-triazole (DABNT) was synthesized by a facile method and its crystalline density was determined as 1.839 g·cm−3 at 293(2) K by X-ray diffraction. Its thermal decomposition kinetics and mechanism were studied by means of differential scanning calorimetry-thermogravimetry (DCS-TG), in situ thermolysis by rapid-scan Fourier transform infrared spectroscopy (RSFTIR) and simultaneous TG-IR technology. The results showed that the apparent activation energies obtained by the Kissinger, Ozawa and Starink methods were 122.9 kJ·mol−1, 123.2 kJ·mol−1 and 123.5 kJ·mol−1, respectively. The thermodynamic parameters of ΔS≠, ΔH≠ and ΔG≠ were −37.5 J·K−1·mol−1, 118.4 kJ·mol−1 and 138.7 kJ·mol−1, respectively. The decomposition reaction process of DABNT starts with the transformation from a primary amine to a secondary amine and then the loss of one nitro-group from the DABNT structure. Gaseous products, such as N2O and H2O, were detected from decomposition in the range of 50-300 °C. Density functional theory (DFT) calculations were further employed to illustrate the decomposition mechanism. The above-mentioned information on the synthesis and thermal behaviour is quite useful for the scale-up and evaluation of the thermal safety of DABNT.
Źródło:
Central European Journal of Energetic Materials; 2017, 14, 2; 281-295
1733-7178
Pojawia się w:
Central European Journal of Energetic Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A flexible approach to combating chromatic dispersion in a centralized 5G network
Autorzy:
Ilgaz, Mehmet Alp
Baliž, K. Vuk
Batagelj, B.
Powiązania:
https://bibliotekanauki.pl/articles/1818223.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Stowarzyszenie Elektryków Polskich
Tematy:
chromatic dispersion
opto-electronic oscillator
power penalty
radio access network
tunable dispersion-compensation module
Opis:
This article proposes and examines a solution in which the base-station for the fifth generation radio access network is simplified by using a single millimeter-wave oscillator in the central-station and distributing its millimeter-wave signal to the base-stations. The system is designed in such a way that the low-phase-noise signal generated by an opto-electronic oscillator is transmitted from the central-station to multiple base-stations via a passive optical network infrastructure. A novel flexible approach with a single-loop opto-electronic oscillator at the transmitting end and a tunable dispersion-compensation module at the receiving end(s) is proposed to distribute a power-penalty-free millimeter-wave signal in the radio access network. Power-penalty-free signal transmission from 10 MHz up to 45 GHz with an optical length of 20 km is achieved by a combination of a tunable dispersion-compensation module and an optical delay line. In addition, measurements with a fixed modulation frequency of 39 GHz and discretely incrementing optical fiber lengths from 0.625 km to 20 km are shown. Finally, a preliminary idea for an automatically controlled feedback-loop tuning system is proposed as a further research entry point.
Źródło:
Opto-Electronics Review; 2020, 28, 1; 35--42
1230-3402
Pojawia się w:
Opto-Electronics Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A New Diminutive Wide-band MIMO Antenna with Frequency Agile Features for 4G and 5G Diverse Wireless Applications
Autorzy:
Mudda, Shivleela
K M, Gayathri
Mallikarjun, M
Powiązania:
https://bibliotekanauki.pl/articles/27311969.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:
Diversity gain (DG)
Defective ground structure (DGS)
Fractional bandwidth (FBW)
ITU (International Telecommunication Union)
INSAT
Frequency Reconfigurable antenna (FRA)
Multiple input multiple output (MIMO)
mutual coupling
isolation
5G
Envelope correlation coefficient (ECC)
Opis:
This paper demonstrates a low-profile, wide-band, two-element, frequency-reconfigurable MIMO antenna that is suitable for diverse wireless applications of 4G and 5G such as WLAN/Bluetooth (2.4–2.5 GHz), WLAN (2.4–2.484 GHz, 5.15– 5.35 GHz, and 5.725–5.825 GHz), WiMAX (3.3–3.69 GHz and 5.25–5.85 GHz), Sub6GHz band proposed for 5G (3.4–3.6 GHz, 3.6-3.8GHz and 4.4–4.99 GHz), INSAT and satellite X-band(6 to 9.6 GHz). Proposed MIMO favour effortless switching between multiple bands ranging from 2.2 to 9.4 GHz without causing any interference. Both antenna elements in a MIMO array are made up of a single module comprised of a slot-loaded patch and a defective structured ground. Two PIN diodes are placed in the preset position of the ground defect to achieve frequencyreconfigurable qualities. The suggested MIMO antenna has a size of 62 ×25 ×1.5 mm3. Previous reconfigurable MIMO designs improved isolation using a meander line resonator, faulty ground structures, or self-isolation approaches. To attain the isolation requirements of modern devices, stub approach is introduced in proposed design. Without use of stub, simulated isolation is 15dB. The addition of a stub improved isolation even more. At six resonances, measured isolation is greater than 18 dB, the computed correlation coefficient is below 0.0065, and diversity gain is over 9.8 dB.
Źródło:
International Journal of Electronics and Telecommunications; 2023, 69, 3; 439--448
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A Study on Packet Scheduling Algorithms for Healthcare Contents over Fifth Generation (5G) Mobile Cellular Network
Autorzy:
Ramli, Huda Adibah Mohd
Powiązania:
https://bibliotekanauki.pl/articles/1844466.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
packet scheduling
5G
flexible frame structure
transmission reliability
scalable TTI
Opis:
This paper models the downlink Fifth Generation (5G) network that supports a flexible frame structure and a shorter Round-Trip Time (RTT) for Hybrid Automatic Repeat Request (HARQ). Moreover, the design of the renowned Time Division Multiple Access (TDMA) packet scheduling algorithms is revised to allow these algorithms to support packet scheduling in the downlink 5G. Simulation results demonstrate that the Proportional Fair provides a comparable performance to the delay–aware Maximum-Largest Weighted Delay First for simultaneously providing the desired transmission reliability of the Guaranteed Bit Rate (GBR) and Non-Guaranteed Bit Rate (Non - GBR) healthcare contents whilst maximizing the downlink 5G performance.
Źródło:
International Journal of Electronics and Telecommunications; 2020, 66, 4; 729-735
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
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:
Aerial detection of contamination with the use of unmanned vehicles – development prospects
Autorzy:
Harmata, W.
Witczak, M.
Pietrzak, G.
Powiązania:
https://bibliotekanauki.pl/articles/30147312.pdf
Data publikacji:
2018
Wydawca:
Akademia Wojsk Lądowych imienia generała Tadeusza Kościuszki
Tematy:
contamination detection
unmanned aerial vehicles
Opis:
Currently, the territory of the Republic of Poland faces a growing threat of contamination with its sources in catastrophes and technical failures in industrial plants (including nuclear power plants) and uncontrolled release of high-toxic chemicals during transport and, which cannot be excluded, terrorism. The increased level of threat resulting from, among others, those factors caused that the National Contamination Detection and Alerting Systems (KSWiA) with the Contamination Detection System of the Polish Armed Forces as the system coordinator was established in the Republic of Poland in 2006. This paper presents the outline of the aerial system of contamination detection, mainly its technical elements, based on the Unmanned Aerial Vehicle (UAV) carrying on board basic and special-purpose equipment. The elementary way of operating the system while performing tasks as well as requirements for its maintenance and handling have been proposed. Introduction of UAV systems would greatly increase the effectiveness of the Contamination Detection System of the Polish Armed Forces, but also other civilian functional subsystems of KSWSiA. There are many advantages to using them, such as no need to expose personnel to contamination and an enemy impact, high mobility, maneuverability and the capability to operate under difficult terrain conditions.
Źródło:
Scientific Journal of the Military University of Land Forces; 2018, 50, 1(187); 5-24
2544-7122
2545-0719
Pojawia się w:
Scientific Journal of the Military University of Land Forces
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An efficient one-pot multicomponent synthesis and characterization of 5-cyano-1,2,3,4-tetrahydropyrimidine derivatives
Autorzy:
Vaghasiya, R. G.
Shah, V. H.
Powiązania:
https://bibliotekanauki.pl/articles/411702.pdf
Data publikacji:
2015
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
substituted pyrazole-4-carbaldehyde
5-cyano-1,2,3,4-tetrahydropyrimidine derivatives
multi component reaction
non-chromatographic method
Opis:
A series of pyrimidine-5-carbonitrile derivatives was efficiently synthesized via one-pot, multi component reaction (MCRs) of 1,3-bifunctional synthon (ethylcyano acetate), substituted pyrazole-4-carbaldehyde, and thiourea/urea in the presence of basic catalyst. The key advantages of this process are high yields, shorter reaction times, easy work-up, and purification of products by non-chromatographic method.
Źródło:
International Letters of Chemistry, Physics and Astronomy; 2015, 40; 51-60
2299-3843
Pojawia się w:
International Letters of Chemistry, Physics and Astronomy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An Investigation of the MIMO Space Time Block Code Based Selective Decode and Forward Relaying Network over η–µ Fading Channel Conditions
Autorzy:
Shankar, Ravi
Raman, V. V. Raghava
Rane, Kantilal Pitamber
Sarojini, B. K.
Neware, Rahul
Powiązania:
https://bibliotekanauki.pl/articles/2058506.pdf
Data publikacji:
2022
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
5G
MIMO
MRC
non-homogeneous fading channel
PEP
S-DF
SNR
Opis:
In this paper, we examine the end-to-end average pairwise error probability (PEP) and output probability (OP) performance of the maximum ratio combining (MRC) based selective decode and forward (S-DF) system over an η–µ scattering environment considering additive white Gaussian noise (AWGN). The probability distribution function (PDF) and cumulative distribution function (CDF) expressions have been derived for the received signal-to-noise (SNR) ratio and the moment generating function (MGF) technique is used to derive the novel closed-form (CF) average PEP and OP expressions. The analytical results have been further simplified and are presented in terms of the Lauricella function for coherent complex modulation schemes. The asymptotic PEP expressions are also derived in terms of the Lauricella function, and a convex optimization (CO) framework has been developed for obtaining optimal power allocation (OPA) factors. Through simulations, it is also proven that, depending on the number of multi-path clusters and the modulation scheme used, the optimized power allocation system was essentially independent of the power relation scattered waves from the source node (SN) to the destination node (DN). The graphs show that asymptotic and accurate formulations are closely matched for moderate and high SNR regimes. PEP performance significantly improves with an increase in the value of η for a fixed value of µ. The analytical and simulation curves are in close agreement for medium-to-high SNR values.
Źródło:
Journal of Telecommunications and Information Technology; 2022, 1; 79--92
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An Overview of Mobility Management Mechanisms and the Related Challenges in 5G Networks and Beyond
Autorzy:
Alkalsh, Mustafa Mohammed Hasan
Powiązania:
https://bibliotekanauki.pl/articles/24200735.pdf
Data publikacji:
2023
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
B5G
beam switching
handover
HetNet
mobility management
Opis:
Ensuring a seamless connection with various types of mobile user equipment (UE) items is one of the more significant challenges facing different generations of wireless systems. However, enabling the high-band spectrum – such as the millimeter wave (mmWave) band – is also one of the important factors of 5G networks, as it enables them to deal with increasing demand and ensures high coverage. Therefore, the deployment of new (small) cells with a short range and operating within the mmWave band is required in order to assist the macro cells which are responsible for operating long-range radio connections. The deployment of small cells results in a new network structure, known as heterogeneous networks (HetNets). As a result, the number of passthrough cells using the handover (HO) process will be dramatically increased. Mobility management (MM) in such a massive network will become crucial, especially when it comes to mobile users traveling at very high speeds. Current MM solutions will be ineffective, as they will not be able to provide the required reliability, flexibility, and scalability.Thus, smart algorithms and techniques are required in future networks. Also, machine learning (ML) techniques are perfectly capable of supporting the latest 5G technologies that are expected to deliver high data rates to upcoming use cases and services, such as massive machine type communications (mMTC), enhanced mobile broadband (eMBB), and ultra-reliable low latency communications (uRLLC). This paper aims to review the MM approaches used in 5G HetNets and describes the deployment of AI mechanisms and techniques in ″connected mode″ MM schemes. Furthermore, this paper addresses the related challenges and suggests potential solutions for 5G networks and beyond.
Źródło:
Journal of Telecommunications and Information Technology; 2023, 2; 53--62
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł

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