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Tytuł:
A film stress measurement system applicable for hyperbaric environment and its application in coal and gas outburst simulation test
Autorzy:
Liu, Zhong-Zhong
Wang, Han-Peng
Yuan, Liang
Wang, Wei
Zhang, Chong
Xue, Yang
Powiązania:
https://bibliotekanauki.pl/articles/1848966.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
stress measurement system
sealing technology
hyperbaric environment
coal and gas outburst
gas-solid coupling
Opis:
A film stress measurement system applicable for hyperbaric environment was developed to characterize stress evolution in a physical simulation test of a gas-solid coupling geological disaster. It consists of flexible film pressure sensors, a signal conversion module, and a highly-integrated acquisition box which can perform synchronous and rapid acquisition of 1 kHz test data. Meanwhile, we adopted a feasible sealing technology and protection method to improve the survival rate of the sensors and the success rate of the test, which can ensure the accuracy of the test results. The stress measurement system performed well in a large-scale simulation test of coal and gas outburst that reproduced the outburst in the laboratory. The stress evolution of surrounding rock in front of the heading is completely recorded in a successful simulation of the outburst which is consistent with the previous empirical and theoretical analysis. The experiment verifies the feasibility of the stress measurement system as well as the sealing technology, laying a foundation for the physical simulation test of gas-solid coupled geological disasters.
Źródło:
Metrology and Measurement Systems; 2021, 28, 1; 73-88
0860-8229
Pojawia się w:
Metrology and Measurement Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
High sensitivity microsensor assisted by Fano resonance in InSb based terahertz plasmonic waveguide
Autorzy:
Liu, Huaiqing
Zhong, Shuomin
Xu, Gaoming
Powiązania:
https://bibliotekanauki.pl/articles/173246.pdf
Data publikacji:
2019
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
plasmonic
microsensor
terahertz
Fano resonance
Opis:
We propose a compact terahertz plasmonic structure comprising an InSb-dielectric-InSb waveguideside-coupled with two stub resonators. Due to the coherent interference of the splitting discrete andquasi-continuum modes, the reflection spectrum possesses a sharp asymmetric Fano resonance dip, which stems from the phase difference between the two stub resonators. Owing to the permittivity temperature dependent property of InSb, the Fano resonance dip can be actively controlled by tuning temperature. The physical features contribute to a highly efficient plasmonic sensor for both refractive index and temperature sensing. The microsensor yields a sensitivity of ̴2.9 THz/RIUand 1.8 × 10–3 THz/°C. This multiparameter high sensitivity microsensor may find important applications in medical sensing, biosensing and on-chip sensing working in terahertz region.
Źródło:
Optica Applicata; 2019, 49, 4; 585-596
0078-5466
1899-7015
Pojawia się w:
Optica Applicata
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Simultaneous disturbance compensation and Hi/H∞ optimization in fault detection of UAVs
Autorzy:
Liu, H.
Zhong, M.
Yang, R.
Powiązania:
https://bibliotekanauki.pl/articles/331045.pdf
Data publikacji:
2018
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
fault detection
disturbance compensation
unmanned aerial vehicle
detekcja uszkodzeń
kompensacja zakłóceń
bezzałogowy statek powietrzny
Opis:
This paper deals with the problem of robust fault detection (FD) for an unmanned aerial vehicle (UAV) flight control system (FCS). A nonlinear model to describe the UAV longitudinal motions is introduced, in which multiple sources of disturbances include wind effects, modeling errors and sensor noises are classified into groups. Then the FD problem is formulated as fault detection filter (FDF) design for a kind of nonlinear discrete time varying systems subject to multiple disturbances. In order to achieve robust FD performance against multiple disturbances, simultaneous disturbance compensation and Hi/H∞ optimization are carried out in designing the FDF. The optimality of the proposed FDF is shown in detail. Finally, both simulations and real flight data are applied to validate the proposed method. An improvement of FD performance is achieved compared with the conventional Hi/H∞-FDF.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2018, 28, 2; 349-362
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Robust L2 consensus of high-order swarm systems with time-varying delays
Autorzy:
Xi, J
Yao, Z
Liu, G.
Zhong, Y.
Powiązania:
https://bibliotekanauki.pl/articles/205770.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Instytut Badań Systemowych PAN
Tematy:
consensus
swarm system
uncertainty
time delay
disturbance rejection
Opis:
Consensus problems for high-order continuous-time swarm systems in directed networks with time delays, uncertainties and external disturbances are investigated. Firstly, the state space of a swarm system is decomposed into a consensus subspace (CS) and a complement consensus space (CCS). A necessary and sufficient condition for the system with time delays and uncertainties to achieve consensus is presented based on the state projection on CCS, and an explicit expression of the consensus function is shown on the basis of the state projection on CS. Then, a sufficient condition for the system to achieve consensus with a desired L2 performance is given. Finally, numerical simulations are shown to demonstrate theoretical results.
Źródło:
Control and Cybernetics; 2014, 43, 1; 59-77
0324-8569
Pojawia się w:
Control and Cybernetics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
CHINESE EFL TEACHERS’ APPLICATION OF E-EDUCOLOGY OF FOREIGN LANGUAGES: AN INVESTIGATION BASED ON TPACK FRAMEWORK
Autorzy:
Xiaobin, Liu
Wei, Zhang
Huiwen, Zhong
Lijun, Jiang
Powiązania:
https://bibliotekanauki.pl/articles/955754.pdf
Data publikacji:
2014
Wydawca:
Uniwersytet Marii Curie-Skłodowskiej w Lublinie. IATEFL Poland Computer Special Interest Group
Tematy:
Chinese EFL teachers
EEFL
TPACK
EEFL trainings
Opis:
For the past few years, TPACK has become a hot issue in the research fields of teacher education, integration of Information Technology (IT) and curricula as well as teacher knowledge. Besides, more and more concerns have been on TPACK of teachers in different subjects. Based on the TPACK Theory, the author uses questionnaires and interviews to investigate practical application status of Educology of Foreign Languages among English teachers involved in National English Teachers Training Project. The author also offers strategies and suggestions for trainings on Educology of Foreign Languages. The results show that the practical application of English teachers stays pessimistic in that teachers are far from the criterion required in terms of TPACK.
Źródło:
Teaching English with Technology; 2014, 14, 1; 49-75
1642-1027
Pojawia się w:
Teaching English with Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Redevelopment of fractures and permeability changes after multi-seam mining of shallow closely spaced coal seams
Powstawanie spękań wtórnych i zmiany przepuszczalności skał wskutek eksploatacji wielo-pokładowej złóż węgla w płytkich i blisko zalegających pokładach
Autorzy:
Liu, Zhenqi
Zhong, Xiaoxing
Botao, Qin
Ren, Hongwei
Gao, Ang
Powiązania:
https://bibliotekanauki.pl/articles/220170.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
płytkie i blisko zalegające pokłady węgla
eksploatacja wielopokładowa
powstawanie spękań wtórnych
zmiany przepuszczalności
shallow closely spaced coal seams
multi-seam mining
fracture redevelopment
permeability change
Opis:
Mining the lower seams in a sequence of shallow, closely spaced coal seams causes serious air leakage in the upper goaf; this can easily aggravate spontaneous combustion in abandoned coal. Understanding the redevelopment of fractures and the changes in permeability is of great significance for controlling coal spontaneous combustion in the upper goaf. Based on actual conditions at the 22307 working face in the Bulianta coal mine, Particle Flow Code (PFC) and a corresponding physical experiment were used to study the redevelopment of fractures and changes in permeability during lower coal seam mining. The results show that after mining the lower coal seam, the upper and lower goafs become connected and form a new compos ite goaf. The permeability and the number of fractures in each area of the overlying strata show a pattern of „stability-rapid increase-stability“ as the lower coal seam is mined and the working face advances. Above the central area of goaf, the permeability has changed slightly, while in the open-cut and stop line areas are significant, which formed the main air leakage passage in the composite goaf.
Wybieranie kolejnych płytkich sąsiadujących ze sobą pokładów w ramach eksploatacji złóż węgla prowadzi do znaczących wypływów powietrza w zrobach leżących powyżej, co spowodować może wzrost zagrożenia pożarowego wskutek samo-zapłonu węgla pozostałego w zrobach. Dokładne zrozumienie zjawiska powstawania wtórnych spękań skał oraz zmian w ich przepuszczalności ma podstawowe znaczenie dla skutecznego zapobiegania samo-zapłonom węgla w zrobach zalegających powyżej pokładów wybieranych. W oparciu o dane dotyczące aktualnych warunków panujących w rejonie ściany nr 22307 w kopalni węgla Bulianta i wykorzystując oprogramowanie Particle Flow Code (PFC) a także wyniki odpowiednich eksperymentów fizycznych, przeanalizowano procesy powstawania wtórnych spękań skał i zmian ich przepuszczalności w trakcie wybierania niżej zalęgających pokładów wskutek połączenia zrobów leżących na różnych poziomach i powstania nowe-go, połączonego obszaru zrobów. Przepuszczalność i ilość spękań w każdym obszarze warstw nadkładu kształtuje się według schematu: ‘stabilność-gwałtowny wzrost-stabilność’ w miarę postępu przodka i postępowania prac w niżej zalegającym pokładzie. W warstwach nadkładu leżących bezpośrednio ponad środkową częścią zrobów obserwuje się nieznaczne zmiany przepuszczalności, podczas gdy w obszarach wybierania i w obszarach gdzie wybieranie się zakończyło zmiany przepuszczalności będą znaczne, prowadząc do powstania głównego korytarza wypływu powietrza w nowo-powstałym, połączonym obszarze zrobów.
Źródło:
Archives of Mining Sciences; 2019, 64, 4; 671-686
0860-7001
Pojawia się w:
Archives of Mining Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A multi-model based adaptive reconfiguration control scheme for an electro-hydraulic position servo system
Autorzy:
Zhang, Zhao
Yang, Zhong
Liu, Shuchang
Chen, Shuang
Zhang, Xiaokai
Powiązania:
https://bibliotekanauki.pl/articles/2124780.pdf
Data publikacji:
2022
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
fault tolerant control
electro hydraulic position
servo system
multiple model
adaptive control
reconfiguration control
sterowanie tolerujące uszkodzenia
serwomechanizm
sterowanie adaptacyjne
Opis:
Reliability and safety of an electro-hydraulic position servo system (EHPSS) can be greatly reduced for potential sensor and actuator faults. This paper proposes a novel reconfiguration control (RC) scheme that combines multi-model and adaptive control to compensate for the adverse effects. Such a design includes several fixed models, one adaptive model, and one reinitialized adaptive model. Each of the models has its own independent controller that is based on a complete parametrization of the corresponding fault. A proper switching mechanism is set up to select the most appropriate controller to control the current plant. The system output can track the reference model asymptotically using the proposed method. Simulation results validate robustness and effectiveness of the proposed scheme. The main contribution is a reconfiguration control method that can handle component faults and maintain the acceptable performance of the EHPSS.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2022, 32, 2; 185--196
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Multi-direction digital moving mask method for fabricating continuous microstructures
Autorzy:
Zhang, Z
Gao, Y
Luo, N
Zhong, K
Liu, Z
Powiązania:
https://bibliotekanauki.pl/articles/175088.pdf
Data publikacji:
2015
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
multi-direction digital moving mask
superposition
quantization
Opis:
The multi-direction digital moving mask method, employing the superposition of the exposure along various moving directions, is developed for fabricating continuous microstructures. The mask pattern corresponding to each moving direction is determined by projecting the target dose profile in the corresponding moving direction. All the mask patterns are dynamically exposed on the same substrate layer by layer so as to form a 3D profile of the exposure dose. The selection criterion of a quantization number and moving-direction number is discussed. For verification of the multi-direction moving method, experiments are performed to fabricate a square pyramid array and square-based microlens array by moving along two orthogonal directions, and round-based microlens array by moving along six directions.
Źródło:
Optica Applicata; 2015, 45, 1; 79-88
0078-5466
1899-7015
Pojawia się w:
Optica Applicata
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Average intensity of a partially coherent anomalous hollow beam propagating in underwater oceanic turbulence
Autorzy:
Liu, Dajun
Wang, Guiqiu
Zhong, Haiyang
Yin, Hongming
Wang, Yaochuan
Powiązania:
https://bibliotekanauki.pl/articles/175102.pdf
Data publikacji:
2019
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
oceanic turbulence
average intensity
anomalous hollow beam
Opis:
Based on the extended Huygens–Fresnel principle, the cross-spectral density function of a partially coherent anomalous hollow beam (AHB) propagating in underwater oceanic turbulence has been derived. The average intensity of partially coherent AHB propagating in underwater oceanic turbulence has been calculated. The influences of coherence length and the strength of underwater oceanic turbulence on the spreading properties of partially coherent AHB are illustrated and analyzed using numerical examples. It is found that the partially coherent AHB with smaller coherence length and the partially coherent AHB propagating in stronger underwater oceanic turbulence will lose the initial beam profile and evolve into the Gaussian beam faster. The results are useful in applications for underwater wireless optical communication.
Źródło:
Optica Applicata; 2019, 49, 2; 227-239
0078-5466
1899-7015
Pojawia się w:
Optica Applicata
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Practical issues in frequency disturbance recorder design for wide-area monitoring
Autorzy:
Xu, Ch.
Zhong, Z.
Centeno, V.
Conners, R.
Liu, Y.
Powiązania:
https://bibliotekanauki.pl/articles/262637.pdf
Data publikacji:
2005
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie
Tematy:
power system
wide-area monitoring
phasor analysis
frequency tracking
Opis:
To maintain power system operation in a balanced and stable condition, the frequency deviation and the rate of frequency change information are highly desired in monitoring and protection applications of the power grid. How to obtain frequency information more accurately and efficiently has been the topic discussion for decades. PMUs (Phaser Measurement Unit) are the most widely-used devices for measuring phase angle differences and they also provide very accurate frequency information. However, the high installation cost of PMUs limits their applications for wide area control and stability analysis of power system. Thanks to commercial GPS receivers and the fast developments in Ethernet networks, an affordable wide area, quasi real-time, GPS synchronized frequency measurement is now possible. This paper introduces a portable networked Frequency Disturbance Recorder (FDR) device, which can be used at any 110V wall outlet and transmit measured frequency data remotely via the Ethernet. The practical issues and challenges of the device design and implementation are analyzed and discussed. Based on these low cost FDRs, a US-wide Frequency Network (FNET) has been implemented at Virginia Tech and some power system monitoring applications are being developed by taking fully advantage of the FDRs.
Źródło:
Electrical Power Quality and Utilisation. Journal; 2005, 11, 1; 69-76
1896-4672
Pojawia się w:
Electrical Power Quality and Utilisation. Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fluorescence Analysis as an Effective Method Used in Micro/Trace Explosive Detection
Autorzy:
Liu, Y.
Shu, Y.
Liu, Xue-yong.
Xiong, Y.
Zhong, Fa-chun.
Sun, Y.
Powiązania:
https://bibliotekanauki.pl/articles/358808.pdf
Data publikacji:
2009
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
Tematy:
micro/trace explosive detection
fluorescence analysis
conjugated polymer
sensing materials
Opis:
There are many kinds of explosives, and their detection methods vary. Nitroaromatic compound is one of the composition of the explosives commonly used. The fuorescence will be quenched when they touch the fuorescent conjugated polymers. General methods for explosives detection have been summarized in this paper, in addition the application of novel fuorescence analysis technique in explosives detection has been introduced. Fluorescent conjugated polymer as chemical sensing material for explosive detection has been reviewed in detail, also a novel fuorescent sensing flm self-assembled by fuorescent small molecule pyrene and homogeneous fuoroimmunoassay have been presented briefy. The development of fuorescence analysis used in the area of determining explosives has been prospected.
Źródło:
Central European Journal of Energetic Materials; 2009, 6, 3-4; 303-311
1733-7178
Pojawia się w:
Central European Journal of Energetic Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
In vitro co-stimulation of anti-tumor activity by soluble B7 molecules
Autorzy:
He, Wei
Hu, Zhong-Bo
Liu, Fang
Feng, Xian-Qi
Zou, Ping
Powiązania:
https://bibliotekanauki.pl/articles/1041178.pdf
Data publikacji:
2006
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
immunotherapy
tumor escape
gene fusion
recombinant fusion proteins
Opis:
In order to investigate the anti-tumor activity of a soluble B7-1/immunoglobulin G fusion protein and explore an effective method to eliminate immune escape of tumor cells, a recombinant vector encoding this fusion protein was constructed and constitutively expressed in Chinese hamster ovary cells. After purification with protein G affinity chromatography, the soluble fusion protein was tested for bioactivity. Results showed that the fusion protein could significantly increase the density of B7-1 molecules on WEHI-3 cells, a mouse leukemia cell line. Through allogeneic mixed lymphocyte tumor cultures, it was demonstrated that, with the presence of the first signal, it could also significantly enhance T cell activation and killing activity against WEHI-3 cells and interleukin-2 secretion by activated mouse T lymphocytes. The conclusion can be drawn that the soluble B7-IgG fusion protein has a potent capacity to generate or enhance anti-tumor immune response in vitro, and its clinical value deserves further investigation.
Źródło:
Acta Biochimica Polonica; 2006, 53, 4; 807-813
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Research on influencing factors of emergency power support for voltage source converter-based multi-terminal high-voltage direct current transmission system
Autorzy:
Li, Congshan
Zhen, Zikai
Sheng, Tingyu
Liu, Yan
Zhong, Pu
Zhang, Xiaowei
Powiązania:
https://bibliotekanauki.pl/articles/2172797.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
coordinated control
emergency DC power support
influencing factors
VSC- MTDC transmission
Opis:
Voltage source converter-based multi-terminal high-voltage direct current (VSCMTDC) transmission system can realize a multi-point power supply, multi-drop power receiving, and mutual coordination between the converter stations to ensure the reliability of the transmission. Based on the PSCAD/EMTDC platform, a five-terminal DC transmission system model is established. According to the fast power regulation capability and overload capacity of theVSC-MTDC power transmission system, an analysis of additional emergency power support for a transmission system under large disturbance conditions was carried out. A new control strategy for emergency power support that introduces its basic principle is proposed in this paper. It uses the short-term overload capability of the DC system. By changing the power reserve of the converter station and the electrical distance between the converter stations, the influence of the power reserve and the electrical distance on the emergency power supply guarantee is analyzed the stability of the system is improved, thereby improving the sudden change of power caused by voltage fluctuations, and the feasibility of the control module is verified by PSCAD simulation. The simulation results show that when the system power supply suddenly changes, the converter stations at a short distance and large power reserve has a better effect on emergency power supply protection. A comparative study of the active power support of a single converter station and multiple converter stations is carried out. The research results show that the use of emergency power support in the DC transmission system has a good effect on maintaining the stability of the inter-connection system and the reliability of the power supply.
Źródło:
Archives of Electrical Engineering; 2022, 71, 4; 881--894
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Potential risk of Mesodinium rubrum bloom in the aquaculture area of Dapeng’ao cove, China: diurnal changes in the ciliate community structure in the surface water
Autorzy:
Liu, H.
Song, X.
Huang, L.
Tan, Y.
Zhong, Y.
Huang, J.R.
Powiązania:
https://bibliotekanauki.pl/articles/47949.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:
potential risk
Mesodinium rubrum
bloom
aquaculture area
Dapeng'ao cove
China
diurnal change
ciliate community
surface water
heavy rainfall
water column
stratification
irradiance
Opis:
Diurnal changes in the structure of the ciliate community in surface waters were studied in the aquaculture area of Dapeng’ao cove, China. Two periods of heavy rainfall occurred during the study period, intensifying water column stratification and influencing the water’s properties. A total of 21 ciliate taxa from 15 genera were identified; the dominant species was Mesodinium rubrum. The maximum abundance of M. rubrum reached 3.92×104 indiv. dm−3, contributing 95.1% (mean value) to the total ciliate abundance. Diurnal changes in M. rubrum abundance were highly variable, the driving force probably being irradiance and food availability. The results suggest that M. rubrum may form blooms in aquaculture areas when there is a suitable physical regime with enriched nutrients, which is potentially harmful to the fish-farming industry.
Źródło:
Oceanologia; 2012, 54, 1
0078-3234
Pojawia się w:
Oceanologia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Reliability assessment of wind turbine generators by fuzzy universal generating function
Autorzy:
Huang, Tudi
Xiahou, Tangfan
Li, Yan-Feng
Qian, Hua-Ming
Liu, Yu
Huang, Hong-Zhong
Powiązania:
https://bibliotekanauki.pl/articles/1841742.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Polskie Naukowo-Techniczne Towarzystwo Eksploatacyjne PAN
Tematy:
reliability assessment
double fed induction generator
multi-state system
fuzzy universal generating function
Opis:
Wind power has been widely used in the past decade because of its safety and cleanness. Double fed induction generator (DFIG), as one of the most popular wind turbine generators, suffers from degradation. Therefore, reliability assessment for this type of generator is of great significance. The DFIG can be characterized as a multi-state system (MSS) whose components have more than two states. However, due to the limited data and/or vague judgments from experts, it is difficult to obtain the accurate values of the states and thus it inevitably contains epistemic uncertainty. In this paper, the fuzzy universal generating function (FUGF) method is utilized to conduct the reliability assessment of the DFIG by describing the states using fuzzy numbers. First, the fuzzy states of the DFIG system’s components are defined and the entire system state is calculated based the system structure function. Second, all components’ states are determined as triangular fuzzy numbers (TFN) according to experts’ experiences. Finally, the reliability assessment of the DFIG based on the FUGF is conducted.
Źródło:
Eksploatacja i Niezawodność; 2021, 23, 2; 308-314
1507-2711
Pojawia się w:
Eksploatacja i Niezawodność
Dostawca treści:
Biblioteka Nauki
Artykuł
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