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Tytuł:
Design and performance evaluation of vehicular visible light communication system under different weather conditions and system parameters
Autorzy:
El-Mokadem, Eslam S.
Tawfik, Nagwan I.
Aly, Moustafa H.
El-Deeb, Walid S.
Powiązania:
https://bibliotekanauki.pl/articles/2204173.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Stowarzyszenie Elektryków Polskich
Tematy:
visible light communication
beam divergence
bit error rate
vehicular communication
laser diode
Opis:
Vehicular visible light communication is an emerging technology that allows wireless communication between vehicles or between vehicles and infrastructure. In this paper, a vehicular visible light communication system is designed using a non-return to zero on-off keying modulation scheme under the effect of different weather conditions such as clear, haze, and fog. The first model is a light emitting diode-based system and the second is a laser diode-based system. For both models, the influence of system parameters such as beam divergence, transceiver aperture diameters, and receiver responsivity is studied. The impact of the use of the trans-impedance amplifier is also investigated for both models. It was concluded that in the presence of the amplifier, output power of the light emitting diode and laser diode model are increased by 98.46 μW and 0.4719 W, respectively. The performance of the two proposed models is evaluated through bit error rate, quality factor, eye diagram, and output power to have some insightful results about the quality of service for the two proposed models. Under a specific weather condition, the performance of the system would be critical and other techniques should be applied. The maximum achievable link distance for the laser-based and light-emitting diode-based systems is 190 m at a data rate of 25 Gbps and 80 m at a data rate of 60 kbps, respectively, under the same system parameters and weather conditions. The obtained results provide a full idea about the availability of constructing our proposed model in a practical environment, showing a higher performance of the laser diode-based model than that of the light emitting diode-based model.
Źródło:
Opto-Electronics Review; 2023, 31, 2; art. no. e145580
1230-3402
Pojawia się w:
Opto-Electronics Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Parameter estimation of photovoltaic module relied on golden jackal optimization
Autorzy:
Nguyen, Thuan Thanh
Powiązania:
https://bibliotekanauki.pl/articles/27309949.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:
golden jackal optimization
henry gas solubility optimization
particle swarm optimization
PV parameter estimation
single diode model
Opis:
Due to the nonlinear current-voltage (I-V) relationship of the photovoltaic (PV) module, building a precise mathematical model of the PV module is necessary for evaluating and optimizing the PV systems. This paper proposes a method of building PV parameter estimation models based on golden jackal optimization (GJO). GJO is a recently developed algorithm inspired by the idea of the hunting behavior of golden jackals. The explored and exploited searching strategies of GJO are built based on searching for prey as well as harassing and grabbing prey of golden jackals. The performance of GJO is considered on the commercial KC200GT module under various levels of irradiance and temperature. Its performance is compared to well-known particle swarm optimization (PSO), recent Henry gas solubility optimization (HGSO) and some previous methods. The obtained results show that GJO can estimate unknown PV parameters with high precision. Furthermore, GJO can also provide better efficiency than PSO and HGSO in terms of statistical results over several runs. Thus, GJO can be a reliable algorithm for the PV parameter estimation problem under different environmental conditions.
Źródło:
Archives of Electrical Engineering; 2023, 72, 4; 987--1003
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Quantum simulations of band-to-band tunnelling in a type-II broken-gap superlattice diode
Autorzy:
Makowiec, Marcin
Kolek, Andrzej
Powiązania:
https://bibliotekanauki.pl/articles/2204215.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Stowarzyszenie Elektryków Polskich
Tematy:
type-II superlattice
broken-gap superlattice diode
band-to-band tunnelling
quantum transport
nonequilibrium Green’s function
twoband Hamiltonian
Opis:
In recent years, type-II superlattice-based devices have completed the offer of the electronic industry in many areas of applications. Photodetection is one of them, especially in the midinfrared wavelength range. It is due to the unique feature of a superlattice material, which is a tuneable bandgap. It is also believed that the dark current of superlattice-based photodetectors is strongly suppressed due to the suppression of the band-to-band tunnelling current in a superlattice material. This argument relies, however, on a semi-classical approach that treats superlattice as a bulk material with effective parameters extracted from the k·p analysis. In the paper, a superlattice device is analysed on a quantum level: the nonequilibrium Green’s function method is applied to the two-band Hamiltonian of the InAs/GaSb superlattice p-i-n diode. The analysis concentrates on the band-to-band tunnelling with the aim to validate the correctness of a semi-classical description of the phenomenon. The results of calculations reveal that in a superlattice diode, the inter-band tunnelling occurs only for certain values of energy and in-plane momentum, for which electronic and hole sub-bands cross. The transitions occurring for vanishing in-plane momentum produce resonances in the current-voltage characteristics - the feature which was reported in a few experimental observations. This scenario is quite different from that occurring in bulk materials, where there is a range of energy-momentum pairs for which the band-to-band tunnelling takes place, and so current-voltage characteristics are free from any resonances. However, simulations show that, while not justified for a detailed analysis, the semi-classical description can be applied to superlattice-based devices for an ‘order of magnitude’ estimation of the band-to-band tunnelling current.
Źródło:
Opto-Electronics Review; 2023, 31, Special Issue; art. no. e144558
1230-3402
Pojawia się w:
Opto-Electronics Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The effect of rose bengal activated with green diode laser light on selected Gram-positive and Gram-negative bacterial strains
Wpływ różu bengalskiego aktywowanego zielonym światłem lasera diodowego na wybrane szczepy bakterii Gram-dodatnich i Gram-ujemnych
Autorzy:
Greczek-Stachura, Magdalena
Różanowski, Bartosz
Kania, Agnieszka
Powiązania:
https://bibliotekanauki.pl/articles/50959716.pdf
Data publikacji:
2023
Wydawca:
Uniwersytet Komisji Edukacji Narodowej w Krakowie
Tematy:
rose bengal
diode laser light irradiation
bacteria
photodynamic effect
Opis:
In recent years the photodynamic activity of rose bengal activated with green light against selected bacterial strains has been reported. However, according to our knowledge, the differences between the sensitivity of Gram-positive and Gram-negative bacterial strains in the presence of this photosensitizer have not been described. The aim of the conducted research was to examine the antibacterial effect of 535 nm wavelength diode laser light in the presence of rose bengal as photosensitizer on selected reference bacterial strains: Pseudomonas aeruginosa, Enterococcus faecalis, Escherichia coli, Klebsiella pneumoniae and Staphylococcus aureus. Sterile 96-well microtiter plates were used to determine the antibacterial activity of the green light and rose bengal solutions at various concentrations. The labelled bacterial suspensions were placed to each well of the 96-well microtiter plate filled with liquid medium LB and solution of rose bengal. The plates were exposed to green diode laser light. After 24 hours of incubation at 37oC, the turbidance was read in a spectrophotometer. The irradiation in the presence of photosensitizer can act in an antibacterial manner, either bacteriostatically or bactericidally. The tested strains exhibit different sensitivity to irradiation because of the structure of the cell wall, the presence of different bacterial pigments and photoreceptor proteins in some species of bacteria. Gram-positive bacteria, Staphylococcus aureus and Enterococcus faecalis were the most photosensitive strains due to the higher possibility of rose bengal penetration into the bacterial cell, leading to the bacteriostatic effect. Our results show that rose bengal may be applied in the treatment of Gram-positive infections.
W ostatnich latach pojawiły się doniesienia literaturowe o aktywności fotodynamicznej różu bengalskiego aktywowanego światłem zielonym względem wybranych szczepów bakterii. Jednakże, według naszej wiedzy, nie opisano dotychczas różnic we wrażliwości na ten aktywowany światłem zielonym fotosensybilizator pomiędzy bakteriami Gram-dodatnimi i Gram-ujemnymi. Celem przeprowadzonych badań było określenie przeciwbakteryjnego działania diodowego światła laserowego o długości fali 535 nm w obecności różu bengalskiego jako fotosensybilizatora na wybrane wzorcowe szczepy bakterii Pseudomonas aeruginosa, Enterococcus faecalis, Escherichia coli, Klebsiella pneumoniae oraz Staphylococcus aureus. W celu określenia aktywności przeciwbakteryjnej roztworów różu bengalskiego  w różnych stężeniach, naświetlanego światłem, wykorzystano sterylne 96-dołkowe płytki mikrotitracyjne. Standaryzowane zawiesiny bakterii umieszczono w każdym dołku płytki mikrotitracyjnej wypełnionej płynną pożywką LB i roztworem różu bengalskiego. Płytki naświetlano światłem zielonym. Po 24 godzinach inkubacji w temperaturze 37°C odczytywano wartości turbidancji. Diodowe światło laserowe o długości fali 535 nm w obecności fotosensybilizatora może działać antybakteryjnie, bakteriostatycznie lub bakteriobójczo. Badane szczepy bakterii wykazują różną wrażliwość na działanie zielonego światła w obecności różu bengalskiego z powodu różnic w budowie ściany komórkowej, obecności różnych barwników bakteryjnych oraz fotoreceptorów u niektórych gatunków bakterii. Bakterie Gram-dodatnie, Staphylococcus aureus and Enterococcus faecalis były najbardziej foto-wrażliwe ze względu na wyższe prawdopodobieństwo wnikania różu bengalskiego do wnętrza komórki bakteryjnej, prowadzącego do efektu bakteriostatycznego. Nasze wyniki pokazują, że róż bengalski może zostać wykorzystany w leczeniu infekcji wywołanych bakteriami Gram-dodatnimi.
Źródło:
Annales Universitatis Paedagogicae Cracoviensis Studia Naturae; 2023, 8; 53-67
2543-8832
2545-0999
Pojawia się w:
Annales Universitatis Paedagogicae Cracoviensis Studia Naturae
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Band Notch Characteristics Reconfigurable UWB Leaf Shape Monopole Antenna
Autorzy:
Muthusamy, Pachiyaannan
Nallapaneni, Srikanta
Perumalla, Krishna Chaitanya
Punna, Bharghava
Powiązania:
https://bibliotekanauki.pl/articles/2055232.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
band notch
PIN diode
leaf shape monopole antenna
reconfigurable
UWB
Opis:
In this paper a band notch characteristics reconfigurable UWB leaf shape monopole antenna is reported. The proposed antenna size is 42×32×1.6 mm³ and simulated S11-10dB impedance bandwidth is from 2.1 to 13.0 GHz. The notch bands are embodied into the designed antenna to suppress Bluetooth and WiFi bands from 2.3-2.7 GHz and 4.6-5.3 GHz. The PIN Diode is loaded to slot on the DGS to achieve notch bands. It has 4.48dB and 1.7dB gain achieved when diode ON and OFF condition. Further, it encompasses a bio-inspired leaf shape patch having high feasibility for deployment in secret and military purposes.
Źródło:
International Journal of Electronics and Telecommunications; 2022, 68, 2; 223--228
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Design of external microtextures for efficient light outcoupling in OLEDs with different preferential orientation of emission dipoles
Autorzy:
Kovačič, Milan
Powiązania:
https://bibliotekanauki.pl/articles/2074200.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Stowarzyszenie Elektryków Polskich
Tematy:
organic light-emitting diode
light outcoupling
dipole orientation
ray tracing
optical modelling
Opis:
External light outcoupling structures provide a cost-effective and highly efficient solution for light extraction in organic light-emitting diodes. Among them, different microtextures, mainly optimized for devices with isotopically oriented emission dipoles, have been proposed as an efficient light extraction solution. In the paper, the outcoupling for a preferential orientation of emission dipoles is studied for the case of a red bottom-emitting organic light-emitting diode. Optical simulations are used to analyse the preferential orientation of dipoles in combination with three different textures, namely hexagonal array of sine-textures, three-sided pyramids, and random pyramids. It is shown that while there are minimal differences between the optimized textures, the highest external quantum efficiency of 51% is predicted by using the three-sided pyramid texture. Further improvements, by employing highly oriented dipole sources, are examined. In this case, the results show that the top outcoupling efficiencies can be achieved with the same texture shape and size, regardless of the preferred orientation of the emission dipoles. Using an optimized three-sided pyramid in combination with ideally parallel oriented dipoles, an efficiency of 62% is achievable. A detailed analysis of the optical situation inside the glass substrate, dominating external light outcoupling, is presented. Depicted results and their analysis offer a simplified further research and development of external light extraction for organic light-emitting devices with highly oriented dipole emission sources.
Źródło:
Opto-Electronics Review; 2022, 30, 2; art. no. e141542
1230-3402
Pojawia się w:
Opto-Electronics Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Determination of the current-voltage characteristics of the photovoltaic cells using the CoachLabII+ measuring console
Wyznaczanie charakterystyk prądowo-napięciowych ogniw fotowoltaicznych z wykorzystaniem konsoli pomiarowej coachlabii+
Autorzy:
Różański, Stanisław Andrzej
Powiązania:
https://bibliotekanauki.pl/articles/2200277.pdf
Data publikacji:
2022
Wydawca:
Uniwersytet Technologiczno-Humanistyczny im. Kazimierza Pułaskiego w Radomiu
Tematy:
CoachLabII+ console
current-voltage characteristics
maximum power
one-diode model
photovoltaic cell
charakterystyka prądowo-napięciowa
konsola CoachLabII+
moc maksymalna
model jednodiodowy
ogniwo PV
Opis:
The Coach6 software and the CoachLabII+ measuring console coupled with a computer and equipped with appropriate voltage and current sensors were used to determine the current-voltage and power-voltage characteristics of the photovoltaic cells. The current-voltage and power-voltage characteristics for a single cell and cells connected in series and in parallel were tested depending on the light intensity. Using a simplified theoretical model of a photovoltaic cell based on the one-diode equivalent circuit and Shockley diode equation, the ideality factor, diode saturation current and source current were determined, fitting the appropriate theoretical relationship to the measurement results. Based on the current-voltage and power-voltage characteristics, the short-circuit current, open circuit voltage, maximum power, fill factor, conversion efficiency and load resistance were determined. The dependence of the determined parameters on the light intensity was discussed.
Do wyznaczenia charakterystyk prądowo-napięciowych oraz mocowo-napięciowych ogniw fotowoltaicznych wykorzystano oprogramowanie Coach6 oraz konsolę pomiarową CoachLabII+ sprzężoną z komputerem i wyposażoną w odpowiednie czujniki napięcia i prądu. Charakterystyki prądowo-napięciowe dla pojedynczego ogniwa oraz ogniw połączonych szeregowo i równolegle badano w zależności od natężenia światła. Wykorzystując uproszczony model teoretyczny ogniwa fotowoltaicznego bazujący na pojedynczej diodzie oraz wzorze Shockley'a dla prądu diody półprzewodnikowej wyznaczono współczynnik korekcji, prąd wsteczny oraz prąd źródła, dopasowując odpowiednie zależności teoretyczne do wyników pomiarów. Na podstawie charakterystyk prądowo-napięciowych oraz mocowo-napięciowych wyznaczono prąd zwarcia, napięcie obwodu otwartego, moc maksymalną, współczynnik wypełnienia, sprawność konwersji ogniwa oraz rezystancję obciążenia. Zaobserwowano zależność wyznaczonych parametrów od natężenia światła.
Źródło:
Journal of Automation, Electronics and Electrical Engineering; 2022, 4, 2; 31--38
2658-2058
2719-2954
Pojawia się w:
Journal of Automation, Electronics and Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Evaluation of the effects of photostimulation on freeze-thawed bull sperm cells in terms of reproductive potential
Autorzy:
Ömür, A.D.
Powiązania:
https://bibliotekanauki.pl/articles/16539165.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:
in vitro analysis
laser
LED (Light Emitting Diode)
photostimulation
sperm cell
Opis:
The aim of this study was to determine the time-dependent effectiveness of photo-stimulation against bovine sperm cells using a multi-wavelength LED (Light Emitting Diode). Spermatological parameters were evaluated for viability, acrosome structure and motility. In addition, the effect of photo-stimulation on frozen-thawed sperm cells subjected to in vitro capacitation was evaluated in terms of changes in mitochondrial membrane potential. The study consisted of two separate experiments and a total of 32 sperm samples obtained from separate bulls were used. All sperm samples were obtained from Holstein bulls using an artificial vagina. Semen was diluted to a final concentration of 92 x 106 spermatozoa per ml in 0.25 ml straws. The sperm cells were frozen using the conventional method. Straws were kept in a 37°C water bath for 20 seconds and diluted 1:4 in phosphate buffered saline (PBS) to eliminate the potentially deleterious effect of glycerol, the main permeable cryoprotectant in the freezing medium for bull sperm. This dilution also helped in the evaluation of sperm quality parameters. In the first experiment, whereas the 15-10-15 showed no differences with the control, other treatments such as 10-10-10, 5-5-5, and 3-1-3 exhibited significantly higher percentages of viable spermatozoa at 24h. The results obtained for acrosome integrity were pretty much similar to those observed in the sperm viability assessment. In effect, while the treatment consisting of 15-10-15 had no positive effects, shorter treatments exerted a much more positive effect. The percentages of acrosome-intact spermatozoa in 2-1-2 and 1-1-1 were significantly higher than those obtained in the control. The significant differences in mitochondrial membrane potential were observed at 0, 2, 4 and 24h post-photo-stimulation in all treatments, except 15-10-15. The highest increase in the percentage of spermatozoa exhibiting high mitochondrial membrane potential was found in 10-10-10, 5-5-5 and 3-1-3 treatments. With regard to total and progressive motility, whereas 10-10-10 was the best regime, 5-5-5 and 3-1-3 treatments also had a positive effect. However, 15-10-15 appeared to have a stimulating effect upon progressive motility at 2h and 4h but later declined and showed no significant differences with regard to the control at 24h. In the second experiment, not immediately after thawing but after having been kept at room temperature for up to 24h, it was observed that there was no statistical difference in terms of viability, acrosome integrity and total/progressive motility between photostimulation and the control group. This indicates that photo- stimulation is less able to exert a beneficial effect when post-thawed sperm are not immediately stimulated. As a result it was determined that photo-stimulation at a pattern of 10-10-10, 5-5-5, 3-1-3 and, to a lesser extent 2-1-2, increases the resilience of frozen-thawed bull sperm when applied upon thawing.
Źródło:
Polish Journal of Veterinary Sciences; 2022, 25, 2; 249-259
1505-1773
Pojawia się w:
Polish Journal of Veterinary Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Graphene on quartz modified with rhenium oxide as a semitransparent electrode for organic electronics
Autorzy:
Krukowski, Paweł
Piskorski, Michał
Udovytska, Ruslana
Kowalczyk, Dorota A.
Lutsyk, Iaroslav
Rogala, Maciej
Dąbrowski, Paweł
Kozłowski, Witold
Łuszczyńska, Beata
Jung, Jarosław
Ulański, Jacek
Matuszek, Krzysztof
Nadolska, Aleksandra
Przybysz, Przemysław
Ryś, Wojciech
Toczek, Klaudia
Dunal, Rafał
Krempiński, Patryk
Czerwińska, Justyna
Ster, Maxime Le
Skulimowski, Marcin
Kowalczyk, Paweł J.
Powiązania:
https://bibliotekanauki.pl/articles/2174856.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Stowarzyszenie Elektryków Polskich
Tematy:
graphene
rhenium oxide
anode
organic light-emitting diode
Opis:
The presented research shows that commercially available graphene on quartz modified with rhenium oxide meets the requirements for its use as a conductive and transparent anode in optoelectronic devices. The cluster growth of rhenium oxide enables an increase in the work function of graphene by 1.3 eV up to 5.2 eV, which guarantees an appropriate adjustment to the energy levels of organic semiconductors used in organic light-emitting diode devices.
Źródło:
Opto-Electronics Review; 2022, 30, 4; art. no. e141953
1230-3402
Pojawia się w:
Opto-Electronics Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Multiple fiber Bragg grating sensing system based on active mode-locking fiber laser
Autorzy:
Meng, Delong
Yu, Xiaolei
Zhao, Zhimin
Shan, Shilei
Li, Hongzhe
Powiązania:
https://bibliotekanauki.pl/articles/2172831.pdf
Data publikacji:
2022
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
fibre optics
Fabry-Perot laser diode
fibre laser
active mode-locking
fibre Bragg grating
Opis:
In this paper, a new multiple fiber Bragg grating (FBG) sensing system based on active mode-locking fiber laser is proposed. The active mode-locking fiber laser is composed of a linear cavity with an Fabry–Perot laser diode (F-P LD) as a reflective cavity mirror, and the erbium-doped fiber as the gain medium. Meanwhile, the F-P LD is also used as the modulating element of the fiber laser. Multiple FBGs cascaded in a long fiber are used as both the sensors in the system and the components for wavelength selection in the active mode-locking fiber laser. The capacity of the proposed sensing system to interrogate multiple FBGs in wavelength and spatial domain is investigated. The proposed sensing system has the characteristics of low cost, good stability, good compatibility, and can be used in quasi-distributed multi-point sensing.
Źródło:
Optica Applicata; 2022, 52, 3; 375--384
0078-5466
1899-7015
Pojawia się w:
Optica Applicata
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Simple three-stage frequency-stabilized diode laser system using injection-locking and tapered amplifier
Autorzy:
Szonert, Jerzy
Głódź, Małgorzata
Kowalski, Krzysztof
Powiązania:
https://bibliotekanauki.pl/articles/2063897.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Stowarzyszenie Elektryków Polskich
Tematy:
diode laser
optical injection-locking
master oscillator power amplifier
optical limiting amplifier
tapered amplifier
Opis:
We developed a three-stage, amplifying, tunable diode laser system that comprises a master laser in a Littrow configuration, frequency-stabilized by dichroic atomic vapour laser lock, acousto-optic frequency shifter, injection-locked slave laser, and tapered amplifier. The slave amplifies the injected frequency-shifted master beam while suppressing (within 0.5%) the strong dependence of its intensity on the acousto-optic frequency shifter carrier frequency, thus acting as a strongly saturated optical limiting amplifier with constant output power. The resulting beam is then amplified in a tapered amplifier. The system provides an output power above 700 mW at a wavelength of 780 nm, with a time-averaged linewidth of 0.6 MHz, and a frequency drift below 2 MHz/h. Dichroic atomic vapour laser lock enables frequency stabilization in the range of 400 MHz around D2 lines of rubidium. The mode-hop-free tuning range amounts to 2 GHz. Determined by the acousto-optic frequency shifter model used, the fine-tuning range (recision of few tens kHz) spans 70 MHz. A description of the system was presented and its performance was tested. The basic components have been designed in our laboratory.
Źródło:
Opto-Electronics Review; 2022, 30, 1; 1--13
1230-3402
Pojawia się w:
Opto-Electronics Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The outcome of ciliary body ablation with diode laser contact transscleral cyclophotocoagulation in 6 months follow-up
Wyniki leczenia kontaktową, przeztwardówkową cyklofotokoagulacją laserem diodowym w 6 miesięcznej obserwacji
Autorzy:
Mularska, Weronika
Brązert, Agata
Kocięcki, Jarosław
Powiązania:
https://bibliotekanauki.pl/articles/2159013.pdf
Data publikacji:
2022-09-30
Wydawca:
Medical Education
Tematy:
continuous wave laser
diode laser
refractory glaucoma
transscleral cyclophotocoagulation
Opis:
The aim of the study is to analyse the postoperative results of continuous wave, transscleral cyclophotocoagulations (CW-TSCPC) in 6 months follow-up for patients with refractory glaucoma. Material and methods: We retrospectively reviewed 58 records of patients who underwent the transscleral cyclophotocoagulation because of refractory glaucoma at the Department of Ophthalmology, Poznan University of Medical Sciences, Poland, between 2016 and 2022. All patients underwent ophthalmological examination at baseline and during follow-up visits including best-corrected visual acuity, intraocular pressure measurement (IOP), slit-lamp examination, visual field and optical coherence tomography examination of the retinal nerve fiber layer (OCT RNFL). Follow-up time was 6 months. Results: We analyzed a group of 58 patients (28 women and 30 men, average age of 62). Majority of patients (41 eyes, 70.69%) had secondary open angle glaucoma. There were no serious complications of the CW-TSCPC procedure. We achieved IOP normalization (IOP below 22 mmHg) in 81.03% of eyes in 1 month follow-up, in 81.08% after 2 months, and in 72.41% after 6 months. Mean IOP reduction was 53.47%, 47.71%, and 47.65% from baseline at 1, 2, and 6 months, respectively. The number of medications taken by patients was lowered of 74.14%, 70.27% and 68.97% after 1, 2 and 6 months respectively. 17 eyes (29.31%) required additional surgical interventions within 6 months. Conclusions: CW-TSCPC is an effective and safe procedure. It allows lowering of IOP and reduction of drugs number administrated by patients with various types of glaucoma during 6 months follow-up. The procedure is technically easy and with well-controlled postoperative complications.
Celem pracy jest analiza pooperacyjnych wyników leczenia metodą przeztwardówkowej cyklofotokoagulacji fali ciągłej (CW-TSCPC) w 6-miesięcznej obserwacji u pacjentów z jaskrą oporną na leczenie. Materiał i metody: Retrospektywnie przeanalizowaliśmy dane 58 pacjentów, którzy byli leczeni metodą przeztwardówkowej cyklofotokoagulacji z powodu jaskry opornej na leczenie. Pacjenci byli leczeni w Klinice Okulistycznej i Katedrze Okulistyki Uniwersytetu Medycznego w Poznaniu w latach 2016-2022 . Wszyscy pacjenci zostali poddani badaniu okulistycznemu przed rozpoczęciem leczenia oraz na wizytach kontrolnych, badanie objemowało najlepiej skorygowaną ostrość wzroku, pomiar ciśnienia wewnątrzgałkowego (IOP), badanie w lampie szczelinowej, badanie pola widzenia i ocena warstwy włókien nerwowych siatkówki metodą optycznej koherentnej tomografii (OCT RNFL). Okres obserwacji wynosił 6 miesięcy. Wyniki: Przeanalizowaliśmy grupę 58 pacjentów (28 kobiet i 30 mężczyzn, średnia wieku 62 lata). Większość pacjentów (41 oczu, 70,69%) miała jaskrę wtórną otwartego kąta. Nie odnotowaliśmy żadnych poważnych powikłań po CW-TSCPC. Normalizację IOP (IOP poniżej 22 mmHg) uzyskaliśmy u 81,03% pacjentów po 1 miesiącu obserwacji, w 81,08% po 2 miesiącach i w 72,41% po 6 miesiącach. Średnio IOP zostało obniżone o 53,47%, 47,71% i 47,65% w stosunku do wartości wyjściowej, odpowiednio po 1, 2 i 6 miesiącu po zabiegu. Liczba przyjmowanych leków zmniejszyła się u 74,14% pacjentów, 70,27% i 68,97% odpowiednio po 1, 2 i 6 miesiącach. 17 oczu (29,31%) wymagało dodatkowych zabiegów chirurgicznych w ciągu 6 miesięcy. Wnioski: CW-TSCPC jest zabiegiem skutecznym i bezpiecznym, w różnych typach jaskry. Pozwala na obniżenie IOP i zmniejszenie liczby leków przyjmowanych przez pacjenta w 6 miesięcznej obserwacji. Zabieg jest łatwy technicznie a powikłania pooperacyjne dobrze kontrolowane.
Źródło:
OphthaTherapy; 2022, 9, 3; 202-205
2353-7175
2543-9987
Pojawia się w:
OphthaTherapy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Thermal analysis of a two-dimensional array with surface light emission based on nitride EEL lasers
Autorzy:
Dąbrówka, Dominika
Sarzała, Robert P.
Wasiak, Michał
Kafar, Anna
Perlin, Piotr
Saba, Kiran
Powiązania:
https://bibliotekanauki.pl/articles/2174849.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Stowarzyszenie Elektryków Polskich
Tematy:
GaN
diode laser
array with surface light emission
thermal analysis
Opis:
This paper presents the results of a thermal computational analysis of a two-dimensional laser array emitting from a surface. The array consisted of eight equispaced ridge-waveguide edge-emitting nitride diode lasers. Surface emission of light was obtained using mirrors inclined at 45°. The authors investigate how the geometrical dimensions of the array emitters and their pitch in the array affect the increase and distribution of temperature in the device. They also examine the influence on the temperature increase and distribution of the thickness of the insulating SiO₂, the thickness of the gold layer forming the top contact of the laser, and the thickness of the GaN substrate, as well as the influence of the ridge-waveguide width.
Źródło:
Opto-Electronics Review; 2022, 30, 4; art. no. e144115
1230-3402
Pojawia się w:
Opto-Electronics Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Design and analytical calculations of the width and arrangement of quantum well and barrier layers in GaN/AlGaN LED to enhance the performance
Autorzy:
Sharma, L.
Sharma, R.
Powiązania:
https://bibliotekanauki.pl/articles/2063882.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Stowarzyszenie Elektryków Polskich
Tematy:
barrier
multi quantum well
light emitting diode
power efficiency
quantum well
Opis:
This research paper discusses an analytical approach to designing the active region of light emitting diodes to enhance its performance. The layers in the active region were modified and the effects of changing the width of quantum well and barrier layers in a multi-quantum light emitting diode on the output power and efficiency have been investigated. Also, the ratio of the quantum well width to the B layer width was calculated and proposed in this research paper. The study is carried out on two different LED structures. In the first case (i.e., first structure), the width of the quantum well layers is kept constant while the width of the B layers is varied. In the second case (i.e., second structure), both the quantum well and B layer widths are varied. Based on the simulation results, it has been observed that the LED power efficiency increases considerably for a given quantum well to B layers width ratio without increasing the production complexity. It is also seen that for a desired power efficiency the width of quantum well should be between 0.003 μm and 0.006 μm, and the range of B width (height) should be 2.2 to 6 times the quantum well width. The proposed study is carried out on the GaN-AlGaN-based multi-quantum well LED structure, but this study can be extended to multiple combinations of the semiconductor structures.
Źródło:
Opto-Electronics Review; 2021, 29, 4; 141--147
1230-3402
Pojawia się w:
Opto-Electronics Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Detector diode circuit noise measurement and power supply method selection for the fiber optic seismograph
Autorzy:
Niespodziany, Sławomir
Kurzych, Anna T.
Dudek, Michal
Powiązania:
https://bibliotekanauki.pl/articles/1818211.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Stowarzyszenie Elektryków Polskich
Tematy:
fiber optic sensor
fibre optic rotational seismograph
closed loop
detector diode
avalanche photodiode
noise
spectral density
Opis:
This paper investigates the noise levels present at various points in the FOSREM type fiber optic seismograph. The main aim of this research was to discover magnitudes of noise, introduced by various components of the analog and optical circuits of the device. First, the noise present in the electronic circuit without any optics connected is measured. Further experiments show noise levels including the detector diode not illuminated and illuminated. Additional tests were carried out to prove the necessity of analog circuitry shielding. All measurements were repeated using three powering scenarios which investigated the influence of power supply selection on noise. The results show that the electronic components provide a sufficient margin for the use of an even more precise detector diode. The total noise density of the whole device is lower than 4⋅10⁻⁷ rad/(s√Hz). The use of a dedicated Insulating Power Converter as a power supply shows possible advantages, but further experiments should be conducted to provide explicit thermic confirmation of these gains.
Źródło:
Opto-Electronics Review; 2021, 29, 2; 71--79
1230-3402
Pojawia się w:
Opto-Electronics Review
Dostawca treści:
Biblioteka Nauki
Artykuł
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