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Wyszukujesz frazę "Chen, P." wg kryterium: Autor


Tytuł:
A fuzzy shape database to support conceptual design
Autorzy:
Zhang, J.
Pham, B.
Chen, P.
Powiązania:
https://bibliotekanauki.pl/articles/970432.pdf
Data publikacji:
2004
Wydawca:
Polska Akademia Nauk. Instytut Badań Systemowych PAN
Tematy:
odwzorowanie kształtu rozmytego
baza danych rozmyta
projektowanie koncepcyjne
fuzzy shape representation
indexing and retrieval of fuzzy shapes
shape database
fuzzy database
conceptual design
Opis:
At the conceptual stage of design, designers only have vague ideas of initial shapes which they gradually refine. These imprecise shapes may be specified by a set of fuzzy shape descriptors which represent the intent of a designer. It is also desirable to be able to save them in a database for future reference or for use as initial shapes for new designs. Most research on fuzzy databases has been focused on theoretical aspects while a fuzzy database is rarely seen in practice, especially in the design area. This paper aims to construct a fuzzy shape database to support shape design by integrating fuzzy data processing and fuzzy querying functions into a conventional database. A possibility-based framework is used for a fuzzy relational database model.
Źródło:
Control and Cybernetics; 2004, 33, 1; 141-172
0324-8569
Pojawia się w:
Control and Cybernetics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A graphical method for Great Circle Routes
Autorzy:
Hsu, T. P.
Chen, C. L.
Hsieh, T. H.
Powiązania:
https://bibliotekanauki.pl/articles/259336.pdf
Data publikacji:
2017
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
transoceanic shipping
great circle route
waypoints
celestial meridian diagram
Opis:
A great circle route (GCR) is the shortest route on a spherical earth model. Do we have a visual diagram to handle the shortest route? In this paper, a graphical method (GM) is proposed to solve the GCR problems based on the celestial meridian diagram (CMD) in celestial navigation. Unlike developed algebraic methods, the GM is a geometric method. Appling computer software to graph, the GM does not use any equations but is as accurate as using algebraic methods. In addition, the GM, which emphasizes the rotational surface, can depict a GCR and judge its benefit.
Źródło:
Polish Maritime Research; 2017, 1; 12-21
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A novel approach to photonic generation of periodic triangular radio frequency waveforms
Autorzy:
Xiang, P.
Guo, H.
Chen, D.
Zhu, H.
Wu, C.
Powiązania:
https://bibliotekanauki.pl/articles/174643.pdf
Data publikacji:
2015
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
microwave photonics
triangular waveform
polarization modulator (PolM)
microwave photonic filter (MPF)
radio frequency (RF) waveform generation
Opis:
A novel approach to photonic generation of triangular radio frequency waveforms with a tunable repetition rate is proposed and analyzed. In the proposed system, a continuous-wave light is modulated by a reference microwave signal through a polarization modulator, and then its output optical sidebands are manipulated by a microwave photonic filter with a negative tap. By properly adjusting the system parameters, full-duty-cycle triangular radio frequency waveforms can be generated after optical-to-electrical conversion, and its repetition rate (frequency) can be tuned in a wide range. A model describing the proposed system is derived, which is verified via computer simulations.
Źródło:
Optica Applicata; 2015, 45, 3; 381-391
0078-5466
1899-7015
Pojawia się w:
Optica Applicata
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A numerical approach to predict the rotating stall in the vaneless diffuser of a centrifugal compressor using the eigenvalue method
Autorzy:
Hu, C.
Liu, P.
Zhu, X.
Chen, H.
Du, Z.
Powiązania:
https://bibliotekanauki.pl/articles/281006.pdf
Data publikacji:
2017
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
instability
vaneless diffuser
eigenvalue problem
spectral method
Opis:
A two-dimensional incompressible flow model is presented to study the occurrence of rotating stall in vaneless diffusers of centrifugal compressors. The diffuser considered has two parallel walls, and the undisturbed flow is assumed to be circumferentially uniform, isentropic, and to have no axial velocity. The linearized 2D Euler equations for an incompressible flow in a fixed frame of the coordinate system are considered. After discretization by a spectral collocation method based on Chebyshev-Gauss-Lobatto points, the generalized eigenvalue problem is solved through the QZ algorithm. The compressor stability is judged by the imaginary part of the eigenvalue obtained. Based on the 2D stability analysis, the influence of inflow angle, radius ratio and wave number are studied. The results from the present stability analysis are compared with some experimental measurement and Shen’s model. It is showed that diffuser instability increases rapidly and the stall rotational speed decreases quickly with an increase in the diffuser radius ratio. The largest critical inflow angle can be obtained when the wave number is around 3 ∼ 5 for the radius ratio between 1.5 to 2.2. It is also verified that the stability model proposed in this paper agrees well with experimental data and has the capability to predict the onset of rotating stall, especially for wide diffusers.
Źródło:
Journal of Theoretical and Applied Mechanics; 2017, 55, 2; 635-647
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Afamin and adropin in patients with alcohol-induced liver cirrhosis
Autorzy:
Prystupa, A.
Kiciński, P.
Luchowska-Kocot, D.
Sak, J.
Prystupa, T.
Chen, K.-H.
Chen, Y.-H.
Panasiuk, L.
Załuska, W.
Powiązania:
https://bibliotekanauki.pl/articles/2081906.pdf
Data publikacji:
2018
Wydawca:
Instytut Medycyny Wsi
Tematy:
alcoholic liver cirrhosis
Adropin
Child-Pugh score
afamin
Opis:
The aim of the study was to determine serum concentrations of afamin and adropin in patients with alcoholic liver cirrhosis and to define their correlation with the stage of disease. The study included 99 patients with alcoholic cirrhosis from the region of Lublin, (Eastern Poland). Liver cirrhosis was diagnosed based on clinical features, history of heavy alcohol consumption, laboratory tests and abdominal ultrasonography. The control group consisted of 20 healthy individuals without liver disease who did not abuse alcohol. The serum afamin and adropin concentrations were determined using ELISA kits. The concentration of afamin was found to be significantly lower in patients with compensated alcoholic liver cirrhosis, i.e. P-Ch B (85.1±40.6 μg/ml) and P-Ch C (56.4±32.3 μg/ml) individuals, compared to the control group (135.9±43.6 μg/ml); p-value was <0.01 and <0.001, respectively. As far as adropin is concerned, a reverse relationship was demonstrated: the highest concentration was found in patients with P-Ch C (11.7±5.7 ng/ml) cirrhosis. Furthermore, the above concentration was significantly higher compared to patients with P-Ch A cirrhosis (7.2±2.8 ng/ml; p<0.05) and controls (7.5±2.6 ng/ml; p<0.05). The concentration of afamin decreases with the severity of alcoholic liver cirrhosis, which most likely results from impaired hepatic synthesis. Otherwise, the higher the stage of disease according to the Child-Pugh score, the higher the concentration of adropin.
Źródło:
Annals of Agricultural and Environmental Medicine; 2018, 25, 3; 527-531
1232-1966
Pojawia się w:
Annals of Agricultural and Environmental Medicine
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Badania okresu gwarancyjnego dla systemu wieloskładnikowego, w którym zachodzą interakcje uszkodzeniowe
Research on warranty interval of multi-component system with failure interaction
Autorzy:
Cheng, Z. H.
Bai, Y. S.
Cai, L. Y.
Wang, L. Ch.
Li, P. J.
Chen, L.
Powiązania:
https://bibliotekanauki.pl/articles/301278.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Polskie Naukowo-Techniczne Towarzystwo Eksploatacyjne PAN
Tematy:
okres gwarancyjny
koszty
dostępność
interakcje uszkodzeniowe
wieloelementowy
warranty period
cost
availability
failure interaction
multi-component
Opis:
W oparciu o analizę interakcji uszkodzeniowych, przyjęto dla systemu wieloskładnikowego politykę gwarancyjną obejmującą niepełną odnowę profilaktyczną. Zbadano średnią intensywność uszkodzeń dla każdego okresu gwarancyjnego oraz skonstruowano modele kosztów obsługi gwarancyjnej oraz dostępności biorąc pod uwagę intensywność uszkodzeń interakcyjnych. Jako przykład podano projekt okresu gwarancyjnego, który może potwierdzić poprawność przyjętego modelu oraz przedstawiono zalety takiego projektu. W badaniach opracowano technikę i metody ustalania okresu gwarancyjnego dla systemów wieloskładnikowych, które stanowią istotny wkład do teorii gwarancji.
Based on the analysis of failure interaction, imperfect preventive warranty policy is adopted for the multi-component system. Average failure rate of each warranty interval is studied and warranty cost model and availability model are built as viewed from interactive failure rate. Then Warranty period project is brought forward as an example, which can validate the feasibility of model and show the advantage of the project. The research can provide technique and methods for determining Warranty Period of multi-component system, which further enriches and perfects the warranty theory.
Źródło:
Eksploatacja i Niezawodność; 2011, 4; 49-55
1507-2711
Pojawia się w:
Eksploatacja i Niezawodność
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
C-V2X Communications for the Support of a Green Light Optimized Speed Advisory (GLOSA) Use Case
Autorzy:
Chochliouros, Ioannis P.
Spiliopoulou, Anastasia S.
Kostopoulos, Alexandros
Agapiou, George
Lazaridis, Pavlos
Zaharis, Zaharias
Chen, Tao
Dardamanis, Athanassios
Kourtis, Michail-Alexandros
Agapiou, Marinos
Herzog, Uwe
Ladid, Latif
Powiązania:
https://bibliotekanauki.pl/articles/1839465.pdf
Data publikacji:
2021
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
5G
cellular V2X
cooperative awareness messages
cooperative intersection
cooperative ITS
green light-optimized speed advisory
intelligent transportation systems
traffic efficiency
vehicle-to-everything
Opis:
Rapid expansion of 5G affects a number of sectors, including vehicular communications relying on cooperative intelligent transportation systems (C-ITS). More specifically, in the context of the Internet of Vehicles (IoV), a particular emphasis is placed on modern cellular V2X (C-V2X) technologies aiming to further improve road safety. This work originates from the detailed scope of the ongoing 5G-DRIVE research project promoting cooperation between the EU and China, with the aim of demonstrating IoV services that rely on vehicle-to-infrastructure (V2I) communications. With the C-V2X approach serving as a point of departure, we analyze and describe a specific green light-optimized speed advisory (GLOSA) use case, for which we provide a detailed descriptive framework, a proposed architectural framework for trials, as well as specific KPIs for the joint assessment of trials between the EU and China. We also discuss the context for performance test procedures to be conducted as part of the intended trials. GLOSA provides end-users with short-term information on upcoming traffic light status to optimize traffic flows, help prevent speed limit violations, improve fuel efficiency, and reduce pollution.
Źródło:
Journal of Telecommunications and Information Technology; 2021, 2; 93-106
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Calculation of interval damping ratio under uncertain load in power system
Autorzy:
Xing, J.
Chen, C.
Wu, P.
Powiązania:
https://bibliotekanauki.pl/articles/201058.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
power system
low frequency oscillation
interval load
interval damping ratio
successive linear programming method
Opis:
The problem of small-signal stability considering load uncertainty in power system is investigated. Firstly, this paper shows attempts to create a nonlinear optimization model for solving the upper and lower limits of the oscillation mode’s damping ratio under an interval load. Then, the effective successive linear programming (SLP) method is proposed to solve this problem. By using this method, the interval damping ratio and corresponding load states at its interval limits are obtained. Calculation results can be used to evaluate the influence of load variation on a certain mode and give useful information for improvement. Finally, the proposed method is validated on two test systems.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2012, 60, 1; 151-158
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Coated NPK Fertilizer Based on Citric Acid-Crosslinked Chitosan/Alginate Encapsulant
Autorzy:
Mesias, Vince St. D.
Agu, Anne Bernadette S.
Benablo, Precious Japheth L.
Chen, Chun-Hu
Penaloza Jr., David P.
Powiązania:
https://bibliotekanauki.pl/articles/124714.pdf
Data publikacji:
2019
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
controlled release
crosslinking
encapsulation
NPK fertilizer
Opis:
A coated nitrogen-phosphorus-potassium (NPK) fertilizer was prepared via crosslinking chitosan and alginate using citric acid. Fourier transform infrared (FTIR) spectroscopy, scanning electron microscopy (SEM), particle size analysis, and zeta potential measurement showed the successful crosslinking, appropriate size, and colloidal stability of the coated NPK fertilizer. The encapsulation capability of the crosslinked chitosan/alginate (Chi/Alg) was studied using fluorescence spectroscopy and NPK analysis. The release behavior studies under various pH conditions showed that Chi/Alg NPK conformed to the standards of controlled release fertilizer with a maximum release rate of 40% for 30 days. The investigation of the release mechanism using Korsemeyer-Peppas mathematical model showed that the release of nutrients is governed by both coating material relaxation and diffusion process.
Źródło:
Journal of Ecological Engineering; 2019, 20, 11; 1-12
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Collaborative 3D-To-2D Tight-Fitting Garment Pattern Design Process for Scoliotic People
Proces projektowania odzieży dla osób ze skoliozą przy użyciu skanera 3D
Autorzy:
Hong, Y.
Zeng, X.
Bruniaux, P.
Liu, K.
Chen, Y.
Zhang, X.
Powiązania:
https://bibliotekanauki.pl/articles/232785.pdf
Data publikacji:
2017
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Biopolimerów i Włókien Chemicznych
Tematy:
atypical morphology
virtual prototyping
collaborative design
sensory evaluation
design process
nietypowa morfologia
projektowanie wirtualne
ocena sensoryczna
proces projektowania
Opis:
This paper presents a virtual design process for a tight-fitting garment pattern for adapter consumer garments, aimed at consumers with scoliosis. The design process proposed is based on a virtual human model created using a 3D scanner, allowing simulation of the morphological shape of an individual with atypical physical deformations. Customized 2D and 3D virtual garment prototyping tools are used in combination to create products through interactions between the consumer, designer and pattern maker. After following an interactive sequence: Scanning – Design – Display – Evaluation – Adjustment, a final design solution acceptable to both the designer and consumer can be obtained. Through this process, traditional 2D garment design knowledge, especially design rules influenced by the fabric information, is fully utilized to support the design process proposed. Using the knowledge based collaborative design process, design satisfaction can be largely improved.
W artykule przedstawiono wirtualny proces projektowania wzoru odzieży dla osób ze skoliozą. Zaproponowany projekt jest oparty na wirtualnym modelu ciała człowieka stworzonym przy użyciu skanera 3D, umożliwiającego symulację morfologicznego kształtu ciała osoby o nietypowych deformacjach fizycznych. Po wykonaniu sekwencji interaktywnej: skanowanie – projekt – wyświetlacz – ocena – dostosowanie, można uzyskać ostateczne rozwiązanie projektowe akceptowalne zarówno dla projektanta, jak i dla konsumentów. W tym procesie tradycyjna wiedza z zakresu zasad projektowania odzieży 2D jest w pełni wykorzystywana w celu wspierania zaproponowanego procesu projektowania. Korzystając z kombinacji obu systemów 2D i 3D można w znacznym stopniu poprawić jakość otrzymanego projektu. Udane rozwiązania projektowe można zintegrować z bazą wiedzy o projektowaniu mody, aby tworzyć nowe zasady projektowania i rozszerzać profesjonalną wiedzę dotyczącą projektowania.
Źródło:
Fibres & Textiles in Eastern Europe; 2017, 5 (125); 113-118
1230-3666
2300-7354
Pojawia się w:
Fibres & Textiles in Eastern Europe
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Construction Workers Reasons for Not Reporting Work-Related Injuries: An Exploratory Study
Autorzy:
Moore, J. T.
Cigularov, K. P.
Sampson, J. M.
Rosecrance, J. C.
Chen, P. Y.
Powiązania:
https://bibliotekanauki.pl/articles/89703.pdf
Data publikacji:
2013
Wydawca:
Centralny Instytut Ochrony Pracy
Tematy:
occupational safety
injury under-reporting
construction
budownictwo
bezpieczeństwo pracy
zgłoszenia wypadków
Opis:
Although under-reporting of work-related injuries by workers is recognized as a significant problem in construction and other industries, little is known about the specific reasons for such occurrences. Qualitative and quantitative methods were used in this study to (a) identify reasons why construction workers may choose not to report work-related injuries, and (b) to investigate the frequency of the identified reasons. Twenty-seven percent of a sample of construction workers (N = 135) indicated that they had failed to report a work-related injury. The most frequent reasons given were related to perceptions of injuries as "small" and "part of the job" as well as fear of negative consequences, which may follow injury reporting. These findings are discussed in terms of practical implications. Strategies to overcome these reasons are suggested to decrease the under-reporting of injuries in the construction industry.
Źródło:
International Journal of Occupational Safety and Ergonomics; 2013, 19, 1; 97-105
1080-3548
Pojawia się w:
International Journal of Occupational Safety and Ergonomics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Critical factors in organisational effectiveness: The case of Saudi Arabian seaports
Autorzy:
Alghaffari, S.
Nguyen, H.-O.
Chen, P. S.-L.
Powiązania:
https://bibliotekanauki.pl/articles/2140916.pdf
Data publikacji:
2018
Wydawca:
Fundacja Centrum Badań Socjologicznych
Tematy:
organisational effectiveness
Saudi Arabia
seaport management
Delphi study
sustainability
Opis:
Seaport management environment has continually changed over the last few decades due to increasing external pressure for seaports to be more competitive, active, dynamic and growing sustainably. These changes have created the need to manage organisational effectiveness in order to monitor port performance and achieve organisational objectives. While organisational effectiveness has been well known in organisational management and important in port management, its application to the seaport sector is limited. This paper presents exploratory research into critical factors of Saudi Arabian seaports’ organisational effectiveness. A Delphi method was applied. Data were collected from a two-round survey of the Saudi Arabian seaports, and interviews of 43 senior staff from Saudi Arabian seaports. A mixed method combining quantitative and qualitative analysis was conducted. A total of thirty-one (31) factors from six different dimensions, namely human resource management, customer service, finance, operation, marketing, research & development, were identified to be influential to OE. The gathered data are no doubt important to seaports because only limited research has been conducted on the application of the organisational effectiveness concept to the seaport sector. Findings of this research regarding selecting and evaluating the most influential factors of OE are relevant to decision makers in managing seaport organisations.
Źródło:
Journal of Sustainable Development of Transport and Logistics; 2018, 3, 2; 49-65
2520-2979
Pojawia się w:
Journal of Sustainable Development of Transport and Logistics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Current Injection Attack against the KLJN Secure Key Exchange
Autorzy:
Chen, H.-P.
Mohammad, M.
Kish, L. B.
Powiązania:
https://bibliotekanauki.pl/articles/220991.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
KLJN
current injection attack
secure key exchange
unconditional security
privacy amplification
Opis:
The Kirchhoff-law-Johnson-noise (KLJN) scheme is a statistical/physical secure key exchange system based on the laws of classical statistical physics to provide unconditional security. We used the LTSPICE industrial cable and circuit simulator to emulate one of the major active (invasive) attacks, the current injection attack, against the ideal and a practical KLJN system, respectively. We show that two security enhancement techniques, namely, the instantaneous voltage/current comparison method, and a simple privacy amplification scheme, independently and effectively eliminate the information leak and successfully preserve the system’s unconditional security.
Źródło:
Metrology and Measurement Systems; 2016, 23, 2; 173-181
0860-8229
Pojawia się w:
Metrology and Measurement Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Design and implementation of large vessel navigation system based on beidou cors
Autorzy:
Huang, P.
Liu, Y.
Du, Z.
Chen, Q.
Chen, J.
Powiązania:
https://bibliotekanauki.pl/articles/260264.pdf
Data publikacji:
2017
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
Berthing
ship-based
Polar Coordinates
CORS
Opis:
The ship’s pilot can obtain the ship auxiliary information through the navigation system, when berthing system can display the parameters such as traverse speed and distance of the ship. But most of the system data show that there are insufficient precision. Taking the CORS system to obtain the location information, data Calculation of Berthing System based on Polar Coordinate Algorithm, this paper puts forward a solution to the “dead point” of the berthing and aiding system, which has a certain reference value for the design of the ship berthing assistance system.
Źródło:
Polish Maritime Research; 2017, S 3; 12-15
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dft investigation of a high energy density polynitro compound, 2,2’-Bis(trinitromethyl)-5,5’-azo-1,2,3,4- tetrazole
Autorzy:
Lin, H.
Zhu, S. G.
Chen, P. Y.
Li, K.
Li, H. Z.
Peng, X. H.
Powiązania:
https://bibliotekanauki.pl/articles/358030.pdf
Data publikacji:
2013
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
Tematy:
polynitro
electronic structure
thermodynamic properties
crystal structure
detonation performance
stability
Opis:
A novel polynitro compound, 2,2’-bis(trinitromethyl)-5,5’-azo- 1,2,3,4-tetrazole, was designed and investigated at the DFT-B3LYP/6-31G(d) level. Its properties, such as electronic structure, IR spectrum, heat of formation, thermodynamic properties and crystal structure, were predicted. This compound is most likely to crystallize in the P21 space group, and the corresponding cell parameters are Z = 2, a = 5.46 Å, b = 9.72 Å, c = 14.05 Å, α = 90°, β = 90°, γ = 90°. In addition, the detonation velocity and pressure were also estimated by using the empirical Kamlet-Jacobs equations, and were predicted to be 8.28 km/s and 31.61 GPa respectively. The oxygen balance of this compound is +13.79%, which indicates that it could serve as an oxidizer. Bond dissociation energy calculations show that the C(13)-N(21)O2 and C(14)-N(30)O2 bonds are the locations of thermal decomposition and that this compounds meets the thermal stability requirements as an exploitable explosive. Keywords: polynitro, electronic structure, thermodynamic properties, crystal structure, detonation performance, stability.
Źródło:
Central European Journal of Energetic Materials; 2013, 10, 3; 325-338
1733-7178
Pojawia się w:
Central European Journal of Energetic Materials
Dostawca treści:
Biblioteka Nauki
Artykuł

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