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Tytuł:
Microphone Based Acoustic Vector Sensor for Direction Finding with Bias Removal
Autorzy:
Wajid, Mohd
Kumar, Arun
Bahl, Rajendar
Powiązania:
https://bibliotekanauki.pl/articles/2141636.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
acoustic measurements
acoustic sensor
acoustic vector sensor
direction-of-arrival estimation
finite element analysis
microphones
particle velocity
sound source localization
Opis:
The acoustic vector sensor (AVS) is used to measure the acoustic intensity, which gives the direction-of-arrival (DOA) of an acoustic source. However, while estimating the DOA from the measured acoustic intensity the finite microphone separation (d) in a practical AVS causes angular bias. Also, in the presence of noise there exists a trade off between the bias (strictly increasing function of d) and variance (strictly decreasing function of d) of the DOA estimate. In this paper, we propose a novel method for mitigating the angular bias caused due to finite microphone separation in an AVS. We have reduced the variance by increasing the microphone separation and then removed the bias with the proposed bias model. Our approach employs the finite element method (FEM) and curves fitting to model the angular bias in terms of microphone separations and frequency of a narrowband signal. Further, the bias correction algorithm based on the intensity spectrum has been proposed to improve the DOA estimation accuracy of a broadband signal. Simulation results demonstrate that the proposed bias correction scheme significantly reduces the angular bias and improves the root mean square angular error (RMSAE) in the presence of noise. Experiments have been performed in an acoustic full anechoic room to corroborate the effect of microphone separation on DOA estimation and the efficacy of the bias correction method.
Źródło:
Archives of Acoustics; 2022, 47, 2; 151-167
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Direction Estimation and Tracking of Coherent Sources Using a Single Acoustic Vector Sensor
Autorzy:
Wajid, Mohd
Kumar, Arun
Bahl, Rajendar
Powiązania:
https://bibliotekanauki.pl/articles/176542.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:
acoustic intensity
acoustic vector sensor
DOA
Direction of Arrival
FEM
Finite Element Method
tracking of acoustic source
Opis:
A single acoustic vector sensor (AVS) cannot be used to find the direction-of-arrival (DOA) of two or more coherent (fully correlated) sources. We have proposed a technique for estimating DOAs (in 2D geometry) of two simultaneous coherent sources using single AVS under the assumption that acoustic sources enter in the field sequentially. The DOA estimation has been investigated with two different configurations of AVS, each consisting of three microphones in a plane. The technique has been also applied in tracking (a) an acoustic source in the presence of stationary interfering coherent source and (b) two coherent sources when the sources are changing their locations alternatively. The experimental environment has been generated using the Finite-Element Method tool viz. COMSOL to corroborate the proposed scheme.
Źródło:
Archives of Acoustics; 2020, 45, 2; 209-219
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Technology Growth in India-Some Important Concerns
Autorzy:
Kumar, Duru Arun
Powiązania:
https://bibliotekanauki.pl/articles/1929945.pdf
Data publikacji:
2012-07-09
Wydawca:
Polskie Towarzystwo Socjologiczne
Tematy:
technology development
consumer market
mobile phones
education
Opis:
Technology has made its presence felt in various sectors of India’s development in the last twenty years. Communication and information technology, manufacturing industry, transportation, defence and space technologies are some of the important sectors which have incorporated modern technology in various aspects of their development and functioning. Also significant and visible changes have taken place in the consumer products available in the Indian market, most of them imported or locally manufactured by multinational corporations based in India. Do these changes qualify India to be considered as a technologically advanced country, and thereby making technological changes an integral part of the social change process of our society? Or are these developments restricted to certain elitist sections of society with little or negligible trickle-down effect of the knowledge bases of the technology developments? In this study a deconstructivist approach is adopted to analyse some of the processes involved in development and diffusion of technology in a society. With the exception of mobile phone technology it is argued that even though India has strong scientific and technological capabilities, it is emerging as a bigger consumer of technology products than as a producer and innovator of modern technology.
Źródło:
Polish Sociological Review; 2012, 178, 2; 295-302
1231-1413
2657-4276
Pojawia się w:
Polish Sociological Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Plasticity and swell-shrink behaviour of electrokinetically stabilized virgin expansive soil using calcium hydroxide and calcium chloride solutions as cationic fluids
Plastyczność i kurczenie się gleby w stabilizacji elektrokinetycznej z wykorzystaniem wodorotlenku wapnia i chlorku wapnia jako płynów kationowych
Autorzy:
James, Jijo
James, Archana
Kumar, Arun
Gomathi, Elumalai
Prasath, Karunakaran Kamal
Powiązania:
https://bibliotekanauki.pl/articles/396625.pdf
Data publikacji:
2019
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
soil
electro kinetic stabilization
cationic fluid
plasticity
swell-shrink
calcium chloride
calcium hydroxide
gleba
stabilizacja elektrokinetyczna
płyn kationowy
plastyczność
kurczliwość pęcznienia
chlorek wapnia
wodorotlenek wapnia
Opis:
This investigation focussed on the plasticity and swell-shrink behaviour of an expansive soil that was stabilized using electro kinetic stabilization (EKS) techniques with cationic fluids for enhancement of stabilization. 0.25 M solutions of calcium hydroxide and calcium chloride were used as cationic fluids. An electro kinetic (EK) cell of dimensions 500 mm x 150 mm x 160 mm with inert graphite electrodes of size 140 mm x 160 mm x 5 mm was adopted for the stabilization process, carried out at an applied voltage of 40 V over a period of 6 hours. After the duration of the test, stabilized soil sample was subjected to Atterberg limits and free swell tests to determine its plasticity and swell-shrink characteristics. The results of the investigation found that both fluids were capable of reducing the plasticity and swell-shrink behaviour of the soil with different levels of effectiveness.
W badaniach skupiono się na plastyczności i kurczeniu się gleby, która została ustabilizowana za pomocą technik stabilizacji elektrokinetycznej (EKS) z płynami kationowymi. Jako płyny kationowe stosowano 0,25 M roztwory wodorotlenku wapnia i chlorku wapnia. Do procesu stabilizacji przyjęto ogniwo elektrokinetyczne (EK) o wymiarach 500 mm x 150 mm x 160 mm z obojętnymi elektrodami grafitowymi o wymiarach 140 mm x 160 mm x 5 mm, przy zastosowaniu napięcia 40 V przez okres 6 godzin. Po zakończeniu testu stabilizowaną próbkę gleby poddano testom Atterberga i badaniom swobodnego spęcznienia w celu określenia jego plastyczności i charakterystyki kurczenia się. Wyniki badania wykazały, że oba płyny były w stanie zmniejszyć plastyczność i kurczenie się gleby przy różnych poziomach skuteczności.
Źródło:
Civil and Environmental Engineering Reports; 2019, 29, 1; 128-146
2080-5187
2450-8594
Pojawia się w:
Civil and Environmental Engineering Reports
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
What Indians Think About Paytm
Autorzy:
Vikas, Daravath
Kumar, A. Arun
Powiązania:
https://bibliotekanauki.pl/articles/1163042.pdf
Data publikacji:
2018
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Consumers
Indian
PCA Method
Paytm app
Perception
Opis:
The Indian economy is an economy which was traditionally based on cash transactions. However, after the midnight of November 8, 2016, India moved towards cashless transactions. The present study deals with Indian consumer’s perception towards mobile wallet app Paytm. For this common people from India belonging to major cities were requested to participate in this study. The field work of the study was conducted during January to February, 2018. The Paytm app has both pros and cons among common respondents. One group of consumers opined that the Paytm app is both easy to use and wallet free. The other group felt Paytm app had connectivity issues i.e., it cannot be connected without internet facility. To overcome these cons and increase the pros of Paytm app, the app can be improvised to work without internet. This will pave way towards making digital India a reality.
Źródło:
World Scientific News; 2018, 110; 184-196
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Multi-pronged approach with synergisation of travel modes and institutional linkages – critical for sustenance of urban transportation
Autorzy:
Rao, P. Ganeswara
Kumar, A. Arun
Shekhar, V.
Powiązania:
https://bibliotekanauki.pl/articles/1076135.pdf
Data publikacji:
2019
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Linkage
Multi Pronged Approach
Travel modes
Urban Transportation
Opis:
Urban areas and metros are growing at a much higher rate than the rural areas. Urban areas play a significant role in the development of the nation by contributing 60% of the national income with only 27.78% of the population. Urban Transport is the most crucial (infrastructure) element in shaping urban development and living. The supply of transport is heterogeneous with a number of interacting and competing modes while the demand for it is derived from the overall pattern of urban activity. Urban Transport has a significant impact on the environment, land use, and land development patterns. In India, multiple institutions are responsible for urban transport and it is governed by multiple policies/ Acts/ legislations. While bus is the major mode of urban transport, local/suburban trains (Railway), Taxies/Autos and personalized transport makeup the rest. Lack of proper public transport has resulted in the increase of personal vehicles, causing problems of congestion, pollution and loss of productive time on travel delays. Study of urban transport systems across the world has revealed that well coordinated institutions with dedicated funding sources and proper planning ensure well functioning urban public transport systems, keeping the cities liveable and productive. Urban transport has to be a public good and be funded through public resources. Indian context have revealed a good beginning made in this direction but absence of institutional arrangements for planning at local level, lack of coordination among various institutions and departments, lack of dedicated funding, lack of inter modal coordination, lack of patronage for new rail based systems are also glaring.
Źródło:
World Scientific News; 2019, 116; 46-61
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Real Time Implementation of Amphibious Unmanned Aerial Vehicle System for Horticulture
Autorzy:
Kumar, M. Arun
Sara, Dioline
Telagam, Nagarjuna
Raj, Balwinder
Powiązania:
https://bibliotekanauki.pl/articles/2202979.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
CATIA
UAV
automation
thrust
throttle
Opis:
Automating the tasks that require manpower has been considered as an area of active research in science and technology. Challenges in designing such systems include accuracy in the parameters of performance, minimal hardware, cost-efficiency, and security. The efficiency of drones designed for replacing humans is often evaluated using their weight, flying time, and power consumption. Herein, the prototypebased Drone model has been designed and discussed for horticulture applications. In this model, a horticulture drone has been designed for structuring and cutting of plants in street interstates. This methodology focuses on automation engineering that is utilized for cutting the plants in less time and less power, thereby diminishing the contamination that may happen by utilizing fuels. The epic part of this plan includes the less weight drone predesigned using Computer-Aided Three-Dimensional Interactive Application (CATIA) V5 Software. The throttle for the motors is adjusted at 50% to get the required thrust for the Unmanned Aerial Vehicle (UAV) to fly. Experimental results show that the horticulture drone has comparatively more flying time and less power consumption.
Źródło:
International Journal of Electronics and Telecommunications; 2023, 69, 1; 127--132
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Lignicolous Macro Fungi from Gujarat, India
Autorzy:
Nagadesi, Praveen Kumar
Arya, Arun
Powiązania:
https://bibliotekanauki.pl/articles/1192178.pdf
Data publikacji:
2016
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Gujarat
Xylariaceae
Agaricales
Macrofungi
Lignicolous
Opis:
The state of Gujarat is well known for its contrasting eco-regions such as moist deciduous forests and deserts. The documentation of Lignicolous fungal diversity of Gujarat state was started in 19th century by different scientist. Detailed fungal diversity study was started in 2003 from different parts of Gujarat to identify the lignicolous fungi that destroy wood logs in different forests. During these studies we noticed a great lacuna in fungal diversity of lignicolous fungi occurring in Gujarat. Here we provide, for the first time, lignicolous fungal diversity from timbers of Gujarat state. The survey revealed that the economically important woods present in Gujarat were 14 and locally available common woods were seven. A total of 69 species Lignicolous macro fungi belong to 15 families and 30 general. These wood deteriorating fungi were belonging to the families Xylariaceae, Agaricaceae Coprinaceae, Pleurotaceae Auricularreae, Bondarzewiaceae Ganodermataceae, Shizophyllaceae, Stecherinaceae, Hymenochaetaceae, Lachnocladiaceae, Schizoporaceae, Fomitopsidaceae, Polyporaceae Stereaceae. All the lignicolous fungi were new to Gujarat, India. For the first time Agaricus bisporus (Lange) Sing. Agaricus silvaticus Schaeff. Coprinus plicatilis (Fr.) Fr. Pleurotus pulmonarius (Fries) Quélet, belonging to Agaricales were reported from Gujarat, India. The commonly observed lignicolous fungi on woods belongs to Basidiomycota and Ascomycota were Schizophyllum commune, Flavodon flavus, Ganoderma lucidum, Daldinia concentric, Xylaria polymorpha.
Źródło:
World Scientific News; 2016, 45, 2; 307-330
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Germplasm of xylariales fungal diversity of Gujarat, India
Autorzy:
Nagadesi, Praveen Kumar
Arya, Arun
Powiązania:
https://bibliotekanauki.pl/articles/1182741.pdf
Data publikacji:
2017
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Daldinia
Fungal Diversity
Germplasm
Gujarat
Xylariales
Opis:
The present paper deals with the eleven species germplasm of Xylariales collected from forest of Gujarat, India. An intensive survey in Gujarat was carried out from 2007–2015. From the total collection 11 xylariaceous fungi were identified in which six belong to daldinia four belong to xylaria and one belong to hypoxylon of Xylariaceae. Daldinia bambusicola Y.-M. Ju, J. D. Rogers, & San Martín, Daldinia loculata (Lév.) Sacc., Daldinia petriniae Y.-M. Ju, J. D. Rogers, & San Martín, are new records to Gujarat. Although some of these species have been previously recorded, present collections showed remarkable morphological differences to the previously described ones.
Źródło:
World Scientific News; 2017, 66; 43-55
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modelling and characterization of laser welded incoloy 800 HT joints
Autorzy:
Arun Kumar, S.
Paulraj, S.
Powiązania:
https://bibliotekanauki.pl/articles/102190.pdf
Data publikacji:
2016
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
incoloy 800 HT
laser welding
modeling and simulation
mechanical and metallurgical characteristics
Opis:
This study aims at finding the effect of laser welding speed on incoloy 800 HT. This alloy is one of the potential materials for Generation IV nuclear plants. Laser welding has several advantages over arc welding such as low fusion zone, low heat input and concentrated heat intensity. Three different welding speeds were chosen and CO2 laser welding was performed. 2D modeling and simulation were done using ANSYS 15 to find out the temperature distribution at different welding speeds and it was found that an increase in the welding speed decreased the temperature. Mechanical properties such as tensile strength, toughness and hardness were evaluated. The effect of welding speed on metallurgical characteristics was studied using optical microscopy (OM), Scanning Electron Microscopy (SEM) with EDS, X-Ray Diffraction (XRD) technique and fractographic analysis. From the results it was found that high welding speed (1400 mm/min) decreased the joint strength. The M23C6 and Ni3Ti carbides were formed in a discrete chain and in a globular form along the grain boundaries of the weld region which increased the strength of the grain boundaries. Fractographic evaluations of the tested specimens for welding speed (1000 and 1200) mm/min showed deep and wide dimples indicating ductile failures.
Źródło:
Advances in Science and Technology. Research Journal; 2016, 10, 30; 115-126
2299-8624
Pojawia się w:
Advances in Science and Technology. Research Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effects of Heat Input on the Mechanical and Metallurgical Characteristics of TIG Welded Incoloy 800HT Joints
Autorzy:
Arun Kumar, S.
Sathiya, P.
Powiązania:
https://bibliotekanauki.pl/articles/356231.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
incoloy 800 HT
corrosion
aging
sensitization
heat input
Opis:
This study focuses on the effect of heat input on the quality characteristics of tungsten inert arc gas welded incoloy 800HT joints using inconel-82 filler wire. Butt welding was done on specimens with four different heat inputs by varying the process parameters like welding current and speed. The result indicated that higher heat input levels has led to the formation of coarser grain structure, reduced mechanical properties and sensitization issues on the weldments. The formation of titanium nitrides provided resistance to fracture and increased the tensile strength of the joints at high temperatures. Further aging was done on the welded sample at a temperature of 750°C for 500 hours and the metallographic result showed formation of carbides along the grain boundaries in a chain of discrete and globular form which increased the hardness of the material. The formation of spinel NiCr2 O4 provided oxidation resistance to the material during elevated temperature service.
Źródło:
Archives of Metallurgy and Materials; 2017, 62, 3; 1673-1679
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Biocontrol of Timber Decaying Fungi by Botanical Pesticides an Ecofreindly Technology
Autorzy:
Nagadesi, Praveen Kumar
Arya, Arun
Powiązania:
https://bibliotekanauki.pl/articles/1190214.pdf
Data publikacji:
2016
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Timber decay
Biocontrol
Plant Extracts
Ecofriendly Technology
Lenzites rot
Ganoderma rot
Schizophyllum rot
Opis:
Timber is one of the longest-used building materials for various types of structures, and has been used in the construction of both historical and modern structures. Timer decay is caused by primarily enzymatic activities of microorganisms. The eco-friendly management of timber degrading fungi is tried by using plant extracts, oils and gels. In most of the fungi 25% methanolic extract was more effective than 5 and 10% concentrations. Lenzites sterioides was completely inhibited by 5% leaf extract of P. Juliflora and 10% leaf extracts of Prosopis, Cymbopogon and Datura at 25% concentration. Oils and gels of Cymbopogon citrates, Anacardium occidentale L., Gossypium barbadensis L., Linum usitatissimum L., Aloe vera L., and Aloe ferox Mill. were used to control the timber degrading fungi. Out of four oils cashew nut shell oil was most effective followed by cotton seed oil. Of the two Aloe gels tried the A. ferox gel showed better results than A. vera. For the first time the biocontrol of L. sterioides T. pini and S. commune, by botanical pesticides was reported. For the first time the biocontrol of L. sterioides T. pini S. commune, G. lucidum, and S. hirsutum by Oils and gels was reported.
Źródło:
World Scientific News; 2016, 44; 206-223
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A Survey on WSN and MCN Convergence Networks
Autorzy:
Swain, Anita
Ray, Arun Kumar
Powiązania:
https://bibliotekanauki.pl/articles/308703.pdf
Data publikacji:
2020
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
IPv4
MAC layer
machine-to-machine network
QoS
Opis:
In this paper, we present a survey concerned with research focusing on the convergence of wireless sensor networks (WSN) and mobile cellular networks (MCN). The convergence of WSNs and MCNs may be a trigger stimulating new research dealing with such issues as architecture, protocols and air interfaces. The highlights and constraints of the phenomenon are discussed in this paper as well. The survey deals with convergence networks and with their smarty city applications. A few open research issues are also brought to the attention of researchers specializing in this field.
Źródło:
Journal of Telecommunications and Information Technology; 2020, 1; 39-49
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Prolonged use of non-invasive ventilation in patients with COVID 19: a case report
Autorzy:
Singh, Kunal
Kumar, Amarjeet
Kumar, Neeraj
Kumar, Ajeet
SK, Arun
Powiązania:
https://bibliotekanauki.pl/articles/29432083.pdf
Data publikacji:
2021-03
Wydawca:
Towarzystwo Pomocy Doraźnej
Tematy:
Case report
COVID 19
non-invasive ventilation
respiratory failure
Opis:
One of the most commonly affected organ systems by SARS-CoV-2 virus is the respiratory system. Major challenge with coronavirus disease is managing the pulmonary complications. Role of non-invasive ventilation in patients of coronavirus disease 2019 (COVID 19) has been questioned in spite of evidence showing its use in acute hypoxemic respiratory failure. Patient selection is very important when using non-invasive ventilation for management of respiratory failure due to COVID 19. Here we report a case of COVID 19 with respiratory failure that was managed successfully with prolonged use of non-invasive ventilation.
Źródło:
Critical Care Innovations; 2021, 4, 1; 44-47
2545-2533
Pojawia się w:
Critical Care Innovations
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Sodium Lignosulfonate: an Industrial Bio-Waste for the Colouration and UV Protective Finish of Nylon Fabric
Autorzy:
Singh Gangwar, Arun Kumar
Singh, Mukesh Kumar
Vishnoi, Prashant
Shakyawar, D. B.
Maity, Subhankar
Powiązania:
https://bibliotekanauki.pl/articles/2056303.pdf
Data publikacji:
2022
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Biopolimerów i Włókien Chemicznych
Tematy:
sodium lignosulfonate
lignin
ultraviolet protection
nylon-6
protective clothing
eco-friendly dyeing
Opis:
Sodium lignosulfonate (NLS), a biomass waste procured from paper and pulp industries as brown colour water soluble powder, is explored in this article as dye for nylon 6 fabrics in aqueous media by the exhaustion method. The fastness and functional properties of the dyed nylon 6 fabrics were studied. The dyeing process parameters were optimised using Box–Behnken response surface design and the ANOVA technique. The NLS treated dyed nylon fabric exhibited an excellent ultraviolet protection factor (UPF), as high as 62.13. The NLS dyed nylon fabrics were characterised using FTIR, FESEM, EDX and instruments. The ultraviolet protection factor (UPF) and colour strength (K/S) values are significantly increased with an increase in the concentration of NLS without any loss of tensile properties and thermal stability. Moreover, NLS treatment has excellent wash fastness. This dyeing process for synthetic fibre like nylon can be a cleaner and more eco-friendly approach by utilising waste biomass of paper from the pulp industries.
Źródło:
Fibres & Textiles in Eastern Europe; 2022, 1 (151); 77--85
1230-3666
2300-7354
Pojawia się w:
Fibres & Textiles in Eastern Europe
Dostawca treści:
Biblioteka Nauki
Artykuł
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