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Tytuł:
Sylwetka naukowa docenta dr hab. Andrzeja Bera
Professor Andrzej Ber -- scientific achievements
Autorzy:
Marks, L.
Powiązania:
https://bibliotekanauki.pl/articles/2063165.pdf
Data publikacji:
2007
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
Ber Andrzej
Źródło:
Biuletyn Państwowego Instytutu Geologicznego; 2007, 425; 3-5
0867-6143
Pojawia się w:
Biuletyn Państwowego Instytutu Geologicznego
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Bibliografia doc. dr hab. Andrzeja Bera
Bibliography of Professor Andrzej Ber
Autorzy:
Jastrzębska-Ber, M.
Powiązania:
https://bibliotekanauki.pl/articles/2063170.pdf
Data publikacji:
2007
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
Ber Andrzej
Źródło:
Biuletyn Państwowego Instytutu Geologicznego; 2007, 425; 7-18
0867-6143
Pojawia się w:
Biuletyn Państwowego Instytutu Geologicznego
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Emisja cyfrowa programów telewizyjnych na obszarze województwa lubuskiego w okresie przejściowym wdrażania naziemnej telewizji cyfrowej
Implementation of the Digital Terrestrial Television (DDT) in the Lubuskie Province area in transitional period
Autorzy:
Półtorak, M.
Powiązania:
https://bibliotekanauki.pl/articles/153478.pdf
Data publikacji:
2012
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
DVB-T
SFN
MFN
BER
VBER
Opis:
W referacie przedstawiono ocenę warunków odbioru programów telewizji cyfrowej nadawanych w multipleksie MUX1 emitowanych w kanale 45 oraz programów nadawanych w multipleksie MUX2, emitowanych w kanałach 41 i 46 z nadajników zlokalizowanych na obszarze województwa lubuskiego w Radiowo - Telewizyjnym Centrum Nadawczym (RTCN) Jemiołów k/Łagowa i w Radiowo - Telewizyjnym Centrum Nadawczym (RTCN) Wichów k/Żagania. Dokonano też oceny warunków odbioru programów telewizji cyfrowej nadawanych w multipleksie MUX3 emitowanych w kanale 21 z nadajnika zlokalizowanego w Radiofonicznym Ośrodku Nadawczym (RON) w Gorzowie Wlkp. Oceny warunków nada-wanych programów dokonano na podstawie przeprowadzonych pomiarów natężenia pola w wyznaczonych Terenowych Punktach Pomiarowych (TPP).
The paper presents an assessment of receiving conditions of digital television programmmess broadcasted in channels: 21, 41, 45 and 46 from transmitters located on the Lubuskie Province area in the RCTN (Radio & Television Transmitting Centre) Jemiołów near the city of Łagów, in the RCTN Wichów near the city of Żagań and in the RON (Radio Transmitting Centre) Gorzów Wielkopolski. In the introduction (Section 1) there is indicated the significance of conversion from analogue to digital broadcasting as well as the importance of The Act of 30 June 2011 on the implementation of DTT. Section 2 describes technical and operational conditions of digital emission of television programmmess on the Lubuskie Province area. In order to assess receiving conditions of digital television programs in the Lubuskie Province, 13 Terrain Measurement Points (TPP) located along the Province border were chosen. Deployment of the TPP is depicted in Fig. 2. On the basis of performed measurements of the field strength in the designated TPP an assessment of reception possibility of digitally broadcasted television programmes was made (Section 3). The results of measurements are presented in Table 2. Section 4 reviews the schedule of introducing DTT in multipleks MUX3 in the Lubuskie Province as well as the timetable of analogue television switch off in Poland and in the Lubuskie Province. In the conclusions (Section 5) the essential data concerning receiving conditions of digital broadcast television programmes in the transitional period from both Radio & Television Transmitting Centres and Radio Transmitting Centre Gorzów Wielkopolski located in the Lubuskie Province are com-pared.
Źródło:
Pomiary Automatyka Kontrola; 2012, R. 58, nr 6, 6; 532-535
0032-4140
Pojawia się w:
Pomiary Automatyka Kontrola
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
System BER w naprawie uszkodzeń oksydacyjnych u roślin
System BER in the repair of oxidative damage in plants
Autorzy:
Włodarczyk, Sylwia
Powiązania:
https://bibliotekanauki.pl/articles/2199375.pdf
Data publikacji:
2020-10-22
Wydawca:
Instytut Hodowli i Aklimatyzacji Roślin
Tematy:
system BER
starzenie nasion
ROS
uszkodzenia oksydacyjne
FPG
OGG1
BER system
seed aging
oxidative damage
Opis:
Rośliny wytworzyły szereg mechanizmów odpowiadających za naprawę uszkodzeń oksydacyjnych wywołanych reaktywnymi formami tlenu. System naprawy poprzez wycinanie zasad wydaje się głównym system naprawczym prowadzącym do zniwelowania zmian wytworzonych przez reaktywne formy tlenu. UUważa się, że dwoma ważnymi enzymami odpowiadającymi za usuwanie 8-oksoguaniny są glikozylaza 8-oksoguaniny DNA i glikozylaza DNA formamidopirimidyny. Wielu badaczy zauważa zależność pomiędzy nagromadzeniem zmian oksydacyjnych w komórce, a aktywnością glikozylazy 8-oksoguaniny DNA i glikozylazy DNA formamidopirimidyny, oraz starzeniem się nasion. Potwierdzono, że poziom FPG oraz OGG1 wzrasta podczas imbibicji nasion. Niniejsza praca ma na celu przybliżenie działania systemu naprawczego BER w procesie napraw uszkodzeń oksydacyjnych oddziaływujących na starzenie się nasion. Celem pracy jest przedstawienie obecnego stanu na temat działania systemu BER (ang Base Excision Repair) w naprawie uszkodzeń oksydacyjnych wpływających na starzenie się nasion.
Plants have developed a number of mechanisms that are responsible for repairing the oxidative damage caused by reactive oxygen species. The base excision repair system is the main repair system for removing such changes. Herein, 8-oxoguanine DNA glycosylase and formamidopyrimidine DNA glycosylase are the two enzymes of importance for removing 8-oxoG. Researchers have confirmed that FPG and OGG1 levels increase during seed imbibition. Indeed, many researchers note the relationship between the accumulation of oxidative changes in the cell and the activity of OGG1 and FPG and the aging of seeds. This short review aims at presenting the published data on the operation of the base excision repair system in the process of repairing oxidative damage affecting seed aging.
Źródło:
Biuletyn Instytutu Hodowli i Aklimatyzacji Roślin; 2020, 290; 15-19
0373-7837
2657-8913
Pojawia się w:
Biuletyn Instytutu Hodowli i Aklimatyzacji Roślin
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Algorithm Based New Tone Reservation Method for Mitigating PAPR in OFDM Systems
Autorzy:
Saha, S.
Chakrabarty, S.
Bhattacharjee, S.
Sil, S.
Powiązania:
https://bibliotekanauki.pl/articles/963815.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
BER
CCDF
OFDM
PAPR
tone reservation algorithm
Opis:
There are abundant methods to mitigate PAPR in OFDM signals among which algorithm based tone reservation is of great popularity owing to its low complexity as well as decent BER. Here we have put forward a new distinct algorithm based Tone Reservation technique which is not only less complex and calculates its own threshold as well as PRT signal (unlike other algorithms requiring predetermined threshold and PRT) but also aptly modifies the data by bit by bit comparison with a modified copy of itself (algorithm modified) thus scaling the peaks as and providing a decent BER and good PAPR reduction.
Źródło:
International Journal of Electronics and Telecommunications; 2017, 63, 3; 293-298
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Complex Signal Mapping for Improving Spectral Efficiency of Li-Fi Systems
Autorzy:
Sileh, Ibrahim K.
Abdulkafi, Ayad A.
Hussein, Mohammed K.
Hardan, Saad M.
Powiązania:
https://bibliotekanauki.pl/articles/958061.pdf
Data publikacji:
2019
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
Li-Fi
OFDM
signal mapping
PAPR
BER
Opis:
Light fidelity (Li-Fi) systems based on the orthogonal frequency division multiplexing (OFDM) scheme have gained more attention in the communications circles, as a means to provide high spectral efficiency and ensure stricter data rate requirements for visible light communication (VLC) systems. However, common OFDM schemes employ Hermitian symmetry to obtain a real-valued signal which is necessary in intensity modulation and direct detection (IM/DD) optical systems, at the expense of doubling the required bandwidth. In this paper, a novel transmission scheme for an OFDM-based Li-Fi system is proposed to tackle the issue in question. A new approach to complex signal mapping (CSM), based on the pairing function method, has been developed for Li-Fi systems. It does not require Hermitian symmetry and, hence, saves about 50% of the required bandwidth. Unlike existing OFDM-based VLC approaches, the proposed scheme employs CSM to ensure a real and positive signal without Hermitian symmetry in order to fully utilize the bandwidth available to Li-Fi networks. Simulation results show that the proposed scheme significantly outperforms other systems in terms of spectral efficiency. The CSM-OFDM based Li-Fi system also achieves a good peak-to-average power ratio (PAPR) reduction with acceptable bit-error-rate (BER) performance, compared to conventional approaches.
Źródło:
Journal of Telecommunications and Information Technology; 2019, 3; 58-62
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Studying and Modeling the Performance of the TCM-STBC Systems in the Rayleigh Channel
Autorzy:
Bendelhoum, Mohammed Sofiane
Lahcene, Mohamed Rida
Menezla, Fayssal
Elarbi, Abderraouf
Powiązania:
https://bibliotekanauki.pl/articles/1839476.pdf
Data publikacji:
2021
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
BER
MIMO
SNR
STBC
STTC
TCM
TCM-STBC
Opis:
Multiple-input multiple-output (MIMO) systems will play an important role in future generations of wireless networks. Space-time block code (STBC) and space-time trellis code (STTC) are two techniques that may be used in multi-antenna radio systems. This paper aims, most importantly, to study the performance of STBC systems at different values of such parameters as spectral efficiency, matrix codes and constellations. A performance comparison between STBC and STTC schemes is performed. In order to show the efficiency of the system’s ability to communicate with uncoded and coded transmission structures over AWGN and Rayleigh channels, the trellis-coded modulation (TCM) is introduced. The results obtained show that the proposed TCM-STBC system model, using one and two receiving antennas, improves the performance of Rayleigh channel communication systems at 9.5 dB and 11.5 dB for a BER of 10−5.
Źródło:
Journal of Telecommunications and Information Technology; 2021, 1; 1-7
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Peripheral challenge by Small and Medium Sized Ports (SMPs) in Multi-Port Gateway Regions: the case study of northeast of China
Autorzy:
Feng, L.
Notteboom, T.
Powiązania:
https://bibliotekanauki.pl/articles/259285.pdf
Data publikacji:
2013
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
SMPS
BER
small and medium-sized enterprises (SMEs)
Opis:
This paper focuses on the role of small and medium-sized ports (SMPs) in enhancing the competitiveness and logistics performance of multi-port gateway regions and associated inland logistics systems. The concepts developed will be applied to the ports in the northeast of China, a multi-port gateway region around the Bohai Sea Economic Rim (BER). Port competition is analyzed by multi-variable methodology and generalized common characteristics of SMPs compared to gateway ports, and the similarities of SMPs and SMEs are also compared. Later in this paper, we analyze the role of a SMP in such region in different variables: (a) cargo volume and market share; (b) international connectivity; (c) relative cluster position; (d) port city and hinterland connection; and (e) logistics and distribution function. The five-dimension analysis combined with in-depth cases study of typical Yingkou port describes a profile of SMPs in the BER and provides future study possibility for more SMPs cases worldwide.
Źródło:
Polish Maritime Research; 2013, S 1; 55-66
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A model of OFDM based maritime VHF communication system for data exchange
Autorzy:
Valčić, S.
Pogány, T.
Mrak, Z.
Powiązania:
https://bibliotekanauki.pl/articles/260386.pdf
Data publikacji:
2018
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
maritime VHF communications
OFDM modulation
AWGN
SNR
BER
Opis:
In the maritime Very High Frequency (VHF) band, there are no systems for transmitting large amounts of data. Therefore, it is necessary to develop new systems that would modernize the Global Maritime Distress and Safety System (GMDSS), significantly relieve the Automatic Identification System’s (AIS) communication channels, and set guidelines for the development of communication infrastructure of the e-Navigation. In line with this, analytical and simulation models of the maritime VHF data transmission communication system using Orthogonal Frequency Division Multiplexing (OFDM) modulation are worked out in this paper. The achieved data rate, the spectral efficiency and the bit error rate (BER) represent validation parameters on which the results of the analytical and simulation models are evaluated. It is concluded that the application of the digital OFDM modulation in the maritime VHF band may improve the GMDSS system by achieving higher data rates compared to the current terrestrial mandatory systems for data exchange, i.e. Digital Selective Calling (DSC) and AIS.
Źródło:
Polish Maritime Research; 2018, 2; 27-36
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Hardware Implementation of MISO on Orthogonal Frequency Division Multiplexing Platform with the Help of Alamouti Algorithm
Autorzy:
Kilaru, S.
Powiązania:
https://bibliotekanauki.pl/articles/226220.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
MISO
SISO
FPGA
Xilinx
BER
SNR
Alamouti
LTE
Opis:
Many software based OFDM techniques were proposed from last half decade to improve the performance of the system. This paper tried to implement the same with Hardwar implementation. We created Hardware based MISO platform with OFDM. We implemented Alamouti algorithm on this test bed. The test bed is implemented with the help of Field Programmable Gate Array (FPGA). The test bed is functionalized with the help of FPGA through Xilinx based system generator for DSP. In this paper we considered the 2×1 MISO implementation with Alamouti algorithm. The simulation results showed that BER and SNR are considerably high for MISO than SISO. The results also proved that proposed OFDM based Alamouti implementation for MISO is excellent in all performance criterions.
Źródło:
International Journal of Electronics and Telecommunications; 2017, 63, 2; 137-143
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Studying and Modeling the Performance of the TCM-STBC Systems in the Rayleigh Channel
Autorzy:
Bendelhoum, Mohammed Sofiane
Lahcene, Mohamed Rida
Menezla, Fayssal
Elarbi, Abderraouf
Powiązania:
https://bibliotekanauki.pl/articles/1839490.pdf
Data publikacji:
2021
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
BER
MIMO
SNR
STBC
STTC
TCM
TCM-STBC
Opis:
Multiple-input multiple-output (MIMO) systems will play an important role in future generations of wireless networks. Space-time block code (STBC) and space-time trellis code (STTC) are two techniques that may be used in multi-antenna radio systems. This paper aims, most importantly, to study the performance of STBC systems at different values of such parameters as spectral efficiency, matrix codes and constellations. A performance comparison between STBC and STTC schemes is performed. In order to show the efficiency of the system’s ability to communicate with uncoded and coded transmission structures over AWGN and Rayleigh channels, the trellis-coded modulation (TCM) is introduced. The results obtained show that the proposed TCM-STBC system model, using one and two receiving antennas, improves the performance of Rayleigh channel communication systems at 9.5 dB and 11.5 dB for a BER of 10−5.
Źródło:
Journal of Telecommunications and Information Technology; 2021, 1; 1-7
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Comparison of traffic performance of QPSK and 16-QAM modulation techniques for OFDM system
Autorzy:
Islam, I.
Hossain, S.
Powiązania:
https://bibliotekanauki.pl/articles/308854.pdf
Data publikacji:
2005
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
OFDM
QPSK
16-QAM
IFFT
frequency spectrum
PAPR
BER
Opis:
Orthogonal frequency division multiplexing (OFDM) provides better spectral efficiency than frequency division multiplexing (FDM), while maintaining orthogonal relation between carriers; hence traffic is better carried by OFDM than FDM within the same spectrum. This paper reveals a comparison of spectral efficiency, performance of communication system in context of bit error rate (BER) for the same information rate and peak to average power ratio (PAPR) of quadrature amplitude shift keying (QPSK) and 16-quadrature amplitude modulation (16-QAM) technique.
Źródło:
Journal of Telecommunications and Information Technology; 2005, 1; 147-152
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Bounding the Locating-Total Domination Number of a Tree in Terms of Its Annihilation Number
Autorzy:
Ning, Wenjie
Lu, Mei
Wang, Kun
Powiązania:
https://bibliotekanauki.pl/articles/31343731.pdf
Data publikacji:
2019-02-01
Wydawca:
Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
Tematy:
total domination
locating-total domination
annihilation num- ber
tree
Opis:
Suppose $ G = (V,E) $ is a graph with no isolated vertex. A subset $ S $ of $ V $ is called a locating-total dominating set of $ G $ if every vertex in $ V $ is adjacent to a vertex in $ S $, and for every pair of distinct vertices $ u $ and $ v $ in $ V − S $, we have $ N(u) \cap S \ne N(v) \cap S $. The locating-total domination number of $G$, denoted by $ \gamma_t^L (G) $, is the minimum cardinality of a locating-total dominating set of $G$. The annihilation number of $G$, denoted by $a(G)$, is the largest integer $k$ such that the sum of the first $k$ terms of the nondecreasing degree sequence of $G$ is at most the number of edges in $G$. In this paper, we show that for any tree of order $ n \ge 2$, $ \gamma_t^L (T) \le a(T) + 1 $ and we characterize the trees achieving this bound.
Źródło:
Discussiones Mathematicae Graph Theory; 2019, 39, 1; 31-40
2083-5892
Pojawia się w:
Discussiones Mathematicae Graph Theory
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Efficacy of electrospun bionanofibers as fumigant pesticides in foodstuff storage
Autorzy:
Allahvaisi, Somaye
Talebi Jahromi, Khalil
Imani, Sohrab
Khanjani, Mohammad
Powiązania:
https://bibliotekanauki.pl/articles/961635.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
fumigant toxicity
nanofi ber
persistence
plodia interpunctella
storage pests
Opis:
Essential oils as alternative synthetic pesticides for pest management of foodstuffs have recently received increased attention. Controlled and slow release formulations of essential oils are used to enhance their efficiency. Two volatile essential oils of Mentha piperita L. and Salvia officinalis L. were investigated for release rate and mortality percentage by fumigant toxicity against 1st instar larvae of Plodia interpunctella. Electrospinning was used to incorporate various concentrations of essential oils in nanofibers. Th e essential oils can be released from the nanofibers for long periods of time, from several days to several weeks. Poly(lactic acid) was used as a green polymer carrier and the essential oils were incorporated into the nanofi bers (8–15v/v% PLA). Insecticidal bioassay revealed that oil-loaded nanofibers (NFOs) were more toxic than pure essential oils (PEOs) against tested larvae. Th e LC50 and LT50 of NFOs were 1.2 and 4 times, respectively, more than PEOs. Our results indicated that PEOs completely lost their insecticidal activity after 14 days, whereas at the same period, NFOs had an average of 93% mortality when applied against P. interpunctella. Therefore, it can be concluded that nanofibers improved the persistence of the oil. This study presents S. officinalis has more toxicity and M. piperita had more persistence for controlling the larvae of indian meal moth.
Źródło:
Journal of Plant Protection Research; 2017, 57, 1
1427-4345
Pojawia się w:
Journal of Plant Protection Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fuzzy Model of 16PSK and 16QAM Modulation
Autorzy:
Butkiewicz, B. S.
Powiązania:
https://bibliotekanauki.pl/articles/227079.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
fuzzy modulation
BER
possibility
probability
PSK
QAM
noise
signal
Opis:
In the paper, a concept of Additive Fuzzy Noise (AFN) channel is introduced. The theoretical equations are derived for Bit Error Rate (BER) and Symbol Error Rate (SER) with some digital modulation scheme in the AFN channel. Following modulations are considered: Phase Shift Keying (16PSK), Quadrature Amplitude Modulation (16QAM). The fuzzy approach to these modulations is presented. The BER and SER values are calculated using possibility theory. The results obtained by fuzzy noise model are compared with conventional approach, where probability models of the noise are used.
Źródło:
International Journal of Electronics and Telecommunications; 2011, 57, 4; 437-442
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The modulatory effect of physical activity on APE1-mediated telomere length and stability; a narrative review
Autorzy:
Betlej, Gabriela
Kwiatkowska, Aleksandra
Bator, Ewelina
Powiązania:
https://bibliotekanauki.pl/articles/1030810.pdf
Data publikacji:
2019
Wydawca:
Uniwersytet Szczeciński. Wydawnictwo Naukowe Uniwersytetu Szczecińskiego
Tematy:
APE1
BER DNA repair
oxidative stress
physical activity
telomeres
Opis:
Physical activity is associated with enhanced generation of reactive oxygen species (ROS) that, in turn, can play a dual role in the human body. Upon physiological conditions, ROS act as secondary messengers in different cell signaling pathways. In contrast, ROS overexpression can lead to oxidative stress and oxidative stress-associated harmful consequences. This exercise-induced interplay among oxidants and antioxidants can modulate numerous physiological and molecular mechanisms, for example telomere length maintenance and stability. The latter is, in turn, under strict control of oxidative stress-activated base excision repair (BER) pathway, one of the DNA repair mechanisms; and growing evidence directs attention to apurinic/ apyrimidinic endonuclease 1 (APE1), a multifunctional BER protein. Therefore, this review intends to address several issues concerning modulatory effect of exercise on APE1-mediated telomere length maintenance and redox activities.
Źródło:
Central European Journal of Sport Sciences and Medicine; 2019, 28, 4; 97-106
2300-9705
2353-2807
Pojawia się w:
Central European Journal of Sport Sciences and Medicine
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Performance Analysis of WDM-FSO Link under Turbulence Channel
Autorzy:
Mazin, Ali A. Ali
Powiązania:
https://bibliotekanauki.pl/articles/1192036.pdf
Data publikacji:
2016
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
free space optics
BER
Atmospheric Turbulence
NRZ format
RZ technique
Opis:
In this paper, the performance analysis of FSO communication link in various atmospheric turbulence has been analysis for different bit rate using NRZ and RZ technique. The effect of turbulence on the link performance has been investigated by varying bit rate, turbulence strength and modulation format. FSO performance carried out for BER, Q. factor, received power under maximum link. Simulation results show that RZ format is best for strong turbulence. Where NRZ technique is used for low and medium turbulence.
Źródło:
World Scientific News; 2016, 50; 160-173
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Comparison of Different Wavelength Propagations over Few-Mode Fiber based on Space Division Multiplexing in Conjunction with Electrical Equalization
Autorzy:
Al-Dawoodi, A.
Fareed, A.
Masuda, T.
Ghazi, A.
Fakhrudeen, A. M.
Aljunid, S. A.
Idrus, S. Z. S.
Amphawan, A.
Powiązania:
https://bibliotekanauki.pl/articles/226328.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
few-mode fiber
nonlinear distortions
decision feedback equalizer
eye diagram
BER
Opis:
Nonlinearities in optical fibers deteriorate system performances and become a major performance-limiting issue. This article aims to investigate the compensation of nonlinear distortions in optical communication systems based on different wavelength propagations over few-mode fiber (FMF). The study adopted Space Division Multiplexing (SDM) based on decision feedback equalizer (DFE). Various transmission wavelength of the FMF system is applied to mitigate the attenuation effect on the system. In this paper, different wavelengths (780, 850 and 1550 nm) are used in SDM. Extensive simulation is performed to assess the attenuation and Bit Error Rate (BER) in each case. The results show that the wavelength of 1550 nm produces higher power and less attenuation in the transmission. Furthermore, this wavelength produces the best distance with less BER compared to 780 nm and 850 nm wavelengths. Moreover, the validations show improvement in BER and eye diagram.
Źródło:
International Journal of Electronics and Telecommunications; 2019, 65, 1; 5-10
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Hexagonal Photonic Crystal Fiber Behaviour as a Chromatic Dispersion Compensator of a 40 Gbps Link
Autorzy:
Betancur-Pérez, A. F.
Botero-Cadavid, J. F.
Reyes-Vera, E.
Gómez-Cardona, N.
Powiązania:
https://bibliotekanauki.pl/articles/226794.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
BER
chromatic dispersion
DWDM
photonic crystal fibers
vector finite element method
Opis:
In this paper, the capabilities of chromatic dispersion compensation of a photonic crystal fiber with a hexagonal distribution of circular air holes was investigated. The vector finite element method with scattering boundary condition was used to analyze a set of configurations of the fiber in which the distance between air holes’ centers was modified. With this method it was possible to obtain the values of chromatic dispersion and confinement factor in the C fiber band. The best suited configurations were tested in a 160 km optical link with a bit rate of 40 Gbps. The performance was evaluated by measuring the bit error rate for a set of 20 channels with channel spacing of 100 GHz. T e simulation results showed that is possible to reach values of hromatic dispersion as low as −850 ps/nm⋅km, confinement losses close to 10⁻³ dB/km and good BER results in the order of 10⁻¹⁷ for a wavelength of 1550 nm.
Źródło:
International Journal of Electronics and Telecommunications; 2017, 63, 1; 93-98
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Oxidative damage to DNA and antioxidant status in aging and age-related diseases
Autorzy:
Olinski, Ryszard
Siomek, Agnieszka
Rozalski, Rafal
Gackowski, Daniel
Foksinski, Marek
Guz, Jolanta
Dziaman, Tomasz
Szpila, Anna
Tudek, Barbara
Powiązania:
https://bibliotekanauki.pl/articles/1041102.pdf
Data publikacji:
2007
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
ROS
aging
oxidative DNA damage
age-related diseases
BER
GO system
Opis:
Aging is a complex process involving morphologic and biochemical changes in single cells and in the whole organism. One of the most popular explanations of how aging occurs at the molecular level is the oxidative stress hypothesis. Oxidative stress leads in many cases to an age-dependent increase in the cellular level of oxidatively modified macromolecules including DNA, and it is this increase which has been linked to various pathological conditions, such as aging, carcinogenesis, neurodegenerative and cardiovascular diseases. It is, however, possible that a number of short-comings associated with gaps in our knowledge may be responsible for the failure to produce definite results when applied to understanding the role of DNA damage in aging and age-related diseases.
Źródło:
Acta Biochimica Polonica; 2007, 54, 1; 11-26
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Using Least Mean p-Power Algorithm to Correct Channel Distortion in MC-CDMA Systems
Autorzy:
Zidane, M.
Safi, S.
Sabri, M.
Frikel, M.
Powiązania:
https://bibliotekanauki.pl/articles/308275.pdf
Data publikacji:
2018
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
adaptive equalization
adaptive identification
BER
BRAN C
LMP
MC-CDMA system
ZF
Opis:
This work focuses on adaptive Broadband Radio Access Network (BRAN) channel identification and on downlink Multi-Carrier Code Division Multiple Access (MCCDMA) equalization. We use the normalized BRAN C channel model for 4G mobile communications, distinguishing between indoor and outdoor scenarios. On the one hand, BRAN C channel parameters are identified using the Least Mean p-Power (LMP) algorithm. On the other, we consider these coefficients in the context of adaptive equalization. We provide an overview and a mathematic formulation of MC-CDMA systems. According to these fundamental concepts, the equalizer technique is investigated analytically to compensate for channel distortion in terms of the bit error rate (BER). The numerical simulation results, for various signal-to-noise ratios and different p threshold, show that the presented algorithm is able to simulate the BRAN C channel measured with different accuracy levels. Furthermore, as far as the adaptive equalization problem is concerned, the results obtained using the zero-forcing equalizer demonstrate that the algorithm is adequate for some particular cases of threshold p.
Źródło:
Journal of Telecommunications and Information Technology; 2018, 3; 23-30
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Bacterial DNA repair genes and their eukaryotic homologues: 1. Mutations in genes involved in base excision repair (BER) and DNA-end processors and their implication in mutagenesis and human disease
Autorzy:
Krwawicz, Joanna
Arczewska, Katarzyna
Speina, Elzbieta
Maciejewska, Agnieszka
Grzesiuk, Elzbieta
Powiązania:
https://bibliotekanauki.pl/articles/1040919.pdf
Data publikacji:
2007
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
mutagenesis
AP endonuclease
SSBR
DNA damage
protein interaction
BER
DNA repair; glycosylase
SSB
Opis:
Base excision repair (BER) pathway executed by a complex network of proteins is the major system responsible for the removal of damaged DNA bases and repair of DNA single strand breaks (SSBs) generated by environmental agents, such as certain cancer therapies, or arising spontaneously during cellular metabolism. Both modified DNA bases and SSBs with ends other than 3'-OH and 5'-P are repaired either by replacement of a single or of more nucleotides in the processes called short-patch BER (SP-BER) or long-patch BER (LP-BER), respectively. In contrast to Escherichia coli cells, in human ones, the two BER sub-pathways are operated by different sets of proteins. In this review the selection between SP- and LP-BER and mutations in BER and end-processors genes and their contribution to bacterial mutagenesis and human diseases are considered.
Źródło:
Acta Biochimica Polonica; 2007, 54, 3; 413-434
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Stateless Zionism: Old traditions, new ideologies
Autorzy:
Maor, Zohar
Powiązania:
https://bibliotekanauki.pl/articles/450407.pdf
Data publikacji:
2018
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
Ahad Ha’am (Asher Ginzberg)
Ber Borochov
Simon Dubnow
Martin Buber
Brit Shalom
nationalism
Zionism
Opis:
This essay aims at exploring Zionist currents that resisted the establishment of a Jewish nation-state, their non-statist vision of Zionism and its roots in Jewish conditions and political traditions, as well as in European anti-statist ideologies and national patterns. First, the non-Zionist diaspora nationalism of Simon Dubnow will be examined, as an important point of reference of non-statist Zionisms; then, the reservations of Ahad Ha’am, founder of “spiritual Zionism”, from the vision of a nation-state and the Marxian anti-statism of Ber Borochov and his socialist followers will be observed. Thereafter, the anarchism of Martin Buber and his followers in the binational factions “Brit Shalom and Ihud” will be discussed; here anti-statism is manifestly theological. Lastly, the current manifestations of non-statist Jewish nationalism will be succinctly explored, focusing on two religious-Zionist rabbis, the late Menachem Fruman and Shimon Gershon Rosenberg, and the American historian David N. Myers.
Źródło:
Przegląd Narodowościowy – Review of Nationalities; 2018, 8; 53-82
2084-848X
Pojawia się w:
Przegląd Narodowościowy – Review of Nationalities
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Suitable Spreading Sequences for Asynchronous MC-CDMA Systems
Autorzy:
Addad, M.
Djebbari, A.
Powiązania:
https://bibliotekanauki.pl/articles/307793.pdf
Data publikacji:
2018
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
BER
crest factor
multiple access interference
MC-CDMA
peak-to-average power ratio
zero correlation zone
Opis:
In order to meet the demand of high data rate transmission with good quality maintained, the multi-carrier code division multiple access (MC-CDMA) technology is considered for the next generation wireless communication systems. However, their high crest factor (CF) is one of the major drawbacks of multi-carrier transmission systems. Thus, CF reduction is one of the most important research areas in MC-CDMA systems. In addition, asynchronous MC-CDMA suffers from the effect of multiple access interference (MAI), caused by all users active in the system. Degradation of the system’s bit error rate (BER) caused by MAI must be taken into consideration as well. The aim of this paper is to provide a comparative study on the enhancement of performance of an MC-CDMA system. The spreading sequences used in CDMA play an important role in CF and interference reduction. Hence, spreading sequences should be selected to simultaneously ensure low CF and low BER values. Therefore, the effect that correlation properties of sequences exert on CF values is investigated in this study. Furthermore, a numerical BER evaluation, as a function of the signal-to-noise ratio (SNR) and the number of users, is provided. The results obtained indicate that a trade-off between the two criteria is necessary to ensure good performance. It was concluded that zero correlation zone (ZCZ) sequences are the most suitable spreading sequences as far as the satisfaction of the above criteria is concerned.
Źródło:
Journal of Telecommunications and Information Technology; 2018, 3; 9-13
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-25 z 33

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