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Tytuł:
Numerical investigation on the vibration reduction of rotating shaft using different groove shapes of tilt bearing
Autorzy:
Abbood, Ahmed Imad
Abdulla, Fadhel Abbas
Powiązania:
https://bibliotekanauki.pl/articles/2203648.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Polskie Towarzystwo Diagnostyki Technicznej PAN
Tematy:
tilt bearings
bearing groove
rotor system
ANSYS transient
fluent
vibration reduction
finite elements
układ wirnikowy
ANSYS
redukcja drgań
badanie numeryczne
łożysko
Opis:
Vibration control is very important for high-speed rotors. Oil film damping is considered an effective vibration-damping method, especially for long shafts in gas turbines, ships, and other high-speed rotating equipment. The existing groove in the internal surface of the tilt bearing increases the amount of oil that flows through the bearing; this is more effective in suppressing the vibration of the rotor system carried by the plain bearing. In order to suppress the vibration of the rotor system, which is supported by sliding bearings, a different groove-shaped oil flow (GSOF) is studied and analysed in this paper. A different shape of grooves in bearings was set up and measured to study the vibration-damping effect of the flow oil shape with GSOF. ANSYS software presents significant benefits to engage Fluent for oil flow with Transient structural for vibration measurements. This paper uses these terms to perform the simulation numerically to explore the groove-shaped damper's damping effect under the rotor system. The study identified three enhancements of vibration and settling time. First, the circular groove showed a 35.71% reduction in amplitude and 10% increase in stilling time; the next one is the circular groove which reduced the amplitude by 42.85% and the settling time by 0%. The third modification was the inclined groove which reduced the amplitude by 42.85% and the settling time by 12%. The last one was the triple-inclined groove, which reduced the amplitude and settling time by 57.14% and 20%, respectively.
Źródło:
Diagnostyka; 2023, 24, 3; art. no. 2023304
1641-6414
2449-5220
Pojawia się w:
Diagnostyka
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Thermal analysis of a gravity-assisted heat pipe working with zirconia-acetone nanofluids: An experimental assessment
Autorzy:
Abdolhossein Zadeh, Amin
Nakhjavani, Shima
Powiązania:
https://bibliotekanauki.pl/articles/240484.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
heat pipe
zirconia-acetone nanofluid
tilt angle
filling ratio
Opis:
An experimental investigation was performed on the thermal performance and heat transfer characteristics of acetone/zirconia nanofluid in a straight (rod) gravity-assisted heat pipe. The heat pipe was fabricated from copper with a diameter of 15 mm, evaporator-condenser length of 100 mm and adiabatic length of 50 mm. The zirconia-acetone nanofluid was prepared at 0.05–0.15% wt. Influence of heat flux applied to the evaporator, filling ratio, tilt angle and mass concentration of nanofluid on the heat transfer coefficient of heat pipe was investigated. Results showed that the use of nanofluid increases the heat transfer coefficient while decreasing the thermal resistance of the heat pipe. However, for the filling ratio and tilt angle values, the heat transfer coefficient initially increases with an increase in both. However, from a specific value, which was 0.65 for filling ratio and 60–65 deg for tilt angle, the heat transfer coefficient was suppressed. This was attributed to the limitation in the internal space of the heat pipe and also the accumulation of working fluid inside the bottom of the heat pipe due to the large tilt angle. Overall, zirconia-acetone showed a great potential to increase the thermal performance of the heat pipe.
Źródło:
Archives of Thermodynamics; 2020, 41, 2; 65-83
1231-0956
2083-6023
Pojawia się w:
Archives of Thermodynamics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optimization of Ladle Tilting Speed for Preventing Temperature Drops in the Die Casting Process
Autorzy:
Ando, Haru
Minamide, Daichi
Takagi, Yuto
Yano, Ken’ichi
Nakamura, Naoto
Sano, Masahiro
Aoki, Takahiro
Nemoto, Yasunori
Powiązania:
https://bibliotekanauki.pl/articles/2172385.pdf
Data publikacji:
2022
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
temperature drop
die casting
optimization
pouring
ladle tilt
Opis:
In die casting, molten metal poured into a shot sleeve is pressed into a mold by a plunger at high speed. The temperature of the metal drops significantly while it is being poured from the ladle to the shot sleeve, resulting in casting defects such as misrun flow lines. Although it is important to control the temperature at all stages of the process, a method for minimizing temperature loss has not yet been clarified to date. In this study, the cause of the temperature drop in the shot sleeve was clarified, and a method of optimizing the ladle tilting speed was proposed to prevent temperature drop. First, experiments were conducted to measure the decrease in metal temperature in the sleeve during pouring. These experiments revealed that the metal cools significantly from the moment it touches the shot sleeve. Therefore, the time from the first contact between the shot sleeve and the metal to the start of pouring was set as the objective function. A genetic algorithm was then used to derive the optimal ladle tilting speed pattern to suppress the temperature drop. This analysis confirmed that the metal was poured without flowing out or running ahead and that the immediate liquid level vibration after pouring was suppressed, thus ensuring stable pouring.
Źródło:
Journal of Casting & Materials Engineering; 2022, 6, 4; 69--75
2543-9901
Pojawia się w:
Journal of Casting & Materials Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Geophysical assessment for gold mineralization potential over the southern part of Kebbi State using aeromagnetic data
Autorzy:
Augie, Abdulrahaman Idris
Salako, Kazeem Adeyinka
Rafiu, Adewuyi Abdulwaheed
Jimoh, Mufutau Owolabi
Powiązania:
https://bibliotekanauki.pl/articles/2124698.pdf
Data publikacji:
2022
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
gold mineralization
Yauri-Zuru schist belt
Centre for Exploration Targeting (CET)
first vertical derivatives (FVD)
second vertical derivatives (SVD)
source parameter imaging (SPI)
tilt derivative (TDR)
Opis:
The magnetic signatures over the southern part of Kebbi State and its environs were analyzed together with the geological settings of the area to delineate the structures that may host gold mineralization. The aeromagnetic data used was the survey carried out by Fugro airborne surveys between 2005 and 2010 on behalf of the Federal Government of Nigeria. The reduction to equator (RTE), first and second vertical derivatives (FVD and SVD), Centre for Exploration Targeting (CET), analytic signal (AS), source parameter imaging (SPI) and tilt derivative (TDR) techniques were applied to the magnetic data covering the area. The results of the AS technique revealed that the study area is characterized with high amplitudes of magnetic anomalies (above 0.048 nT/m) and these could be of ferromagnetic minerals such as gold. The FVD, SVD, CET and TDR techniques also helped in delineating the lineaments (such as faults, fractures or shears zones) believed to be associated with alteration zones which play an important role in determining gold mineralized zones. The direction of the orientation of these features/lineaments trended in the NE-SW direction. The faults, fractures or shears zones delineated represent veins of possible mineralization. The depth of occurrence to the causative bodies using SPI algorithms was found to be below 137 m. Structures delineated within the area, when compared with the geological setting of the area, correspond to: quartz-mica schist, granite, biotite, gneiss, diorite, medium coarse-grained and biotite hornblende granite. Results from these techniques revealed alteration zones that may host gold. These regions correspond to the following areas: SE parts of Yauri and Shanga, Fakai, Ngaski, Zuru, Magama, Rijau, and the eastern part of Wasagu/Danko and Bukkuyum.
Źródło:
Geology, Geophysics and Environment; 2022, 48, 2; 177--193
2299-8004
2353-0790
Pojawia się w:
Geology, Geophysics and Environment
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Advanced multi-engine platform (AMP™) – a way to robust RTK
Autorzy:
Averin, Sergey
Plenkin, Andrey
Ignatev, Pavel
Vorobiev, Michael
Veitsel, Andrey
Powiązania:
https://bibliotekanauki.pl/articles/320719.pdf
Data publikacji:
2019
Wydawca:
Polskie Forum Nawigacyjne
Tematy:
RTK
heading
tilt
receiver frontend
receiver digital section
Opis:
The paper describes the Advanced Multi-Engine Platform (AMP™) – Topcon’s patent pending technique, which is capable to improve RTK performance, based on the idea of running several RTK engines in parallel. The performance of AMP™ is dependent on Topcon receiver board, where it has been implemented, and the best results are achieved with B210 board. The main specifics of B210 is that it has two RF front-ends and a single digital section. Such an architecture allows for calculating heading and tilt within a single receiver board, and providing better RTK performance due to synergy of attitude determination and RTK solutions from two antennas, calculated within a single digital section. The paper describes specifics of B210 board along with mathematical aspects of AMP™ and its logic. The test results demonstrate noticeable improvements in RTK performance for B210 receiver board with AMP™, compared with the classical single-engine RTK approach.
Źródło:
Annual of Navigation; 2019, 26; 12-20
1640-8632
Pojawia się w:
Annual of Navigation
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Badania pozycjonowania paneli fotowoltaicznych na terytorium Polski
Research of the positioning of photovoltaic panels in Poland
Autorzy:
Baran, K.
Leśko, M.
Wachta, H.
Powiązania:
https://bibliotekanauki.pl/articles/156156.pdf
Data publikacji:
2013
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
fotowoltaika
promieniowanie słoneczne
optymalny kąt pochylenia
system nadążny za Słońcem
photovoltaic
solar radiation
optimal tilt angle
solar-tracking system
Opis:
W artykule, metodą symulacyjną, wyznaczono najbardziej korzystny kąt pochylenia panelu fotowoltaicznego dla wybranych miejscowości w Polsce, a następnie zasymulowano jednoosiowy, nadążny system ruchu za Słońcem. Roczną energię, uzyskaną przy wykorzystaniu systemu nadążnego, porównano z energią, uzyskaną z panelu fotowoltaicznego, który był zamontowany w stałej pozycji nakierowania.
The paper presents the results of simulation research on the optimal tilt angle of photovoltaic panels in selected cities of Poland. The simulation was performed using the specialized computer software - Insel, which allowed simulating the work of the renewable energy sources. For the survey simulation there was selected a monocrystalline silicon photovoltaic panel of 185 W power and 14,49 % efficiency. The optimal tilt angle of panels, at which the biggest value of energy was obtained, based on the simulation, was respectively: 24° for Warsaw, 27° for Wroclaw, 30° for Gdansk and Poznan and 38° for Rzeszow. In the second part of the paper there is described the simulation of a single-axis solar-tracking system performed with use of a computer application. The simulation was made for the same cities of Poland, as that for the optimal value of the tilt angle of the photovoltaic module. The researched solar-tracking system tracked the movement of the Sun in the vertical axis, while in the horizontal axis there was set the permanent optimal value of the panel tilt, determined based on the simulation. The application of the mentioned solar-tracking system caused the growth of the obtained energy from 18% (Warsaw) to 26% (Gdansk), depending on the place of the panel location.
Źródło:
Pomiary Automatyka Kontrola; 2013, R. 59, nr 10, 10; 1097-1100
0032-4140
Pojawia się w:
Pomiary Automatyka Kontrola
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analiza podatności na złudzenia wzrokowe ze względu na zależność od pola i płeć
The analysis of susceptibility to visual illusions in the context of field dependence-independence and gender
Autorzy:
Bednarek, Hanna
Lukas, Agnieszka
Powiązania:
https://bibliotekanauki.pl/articles/2014022.pdf
Data publikacji:
2015
Wydawca:
Uniwersytet Łódzki. Wydawnictwo Uniwersytetu Łódzkiego
Tematy:
złudzenia kształtu i kierunku
teoria stałości przechylenia
FDI
Zӧllner i Poggendorff
iluzja Pręta i Ramy
shape and direction illusions
the Tilt-Constancy Theory
Zӧllner and Poggendorff
Rod and Frame illusion
Opis:
Poszukiwano odpowiedzi na pytania: czy osoby ulegające złudzeniom kształtu i kierunku ulegają także złudzeniom stałości przechylenia; czy osoby zależne w porównaniu z niezależnymi od pola w ujęciu Witkina charakteryzuje większa podatność na złudzenia; czy kobiety bardziej niż mężczyźni ulegają złudzeniom wzrokowym? Przeprowadzono dwa badania. W pierwszym wzięło udział 75 uczniów (M = 18,5; SD = 0,5), zaś w drugim 31 studentów psychologii (M = 20; SD = 0,5). Zastosowano Rod and Frame Test do badania iluzji Pręta i Ramy, komputerową symulację złudzeń wzrokowych: Zollnera, Poggendorffa, Ponzo, Ebbinghausa, Millera-Lyera oraz EFT Witkina do określania zależności od pola. Okazało się, że kobiety bardziej niż mężczyźni ulegają iluzji Pręta i Ramy, Poggendorffa i Zӧllnera, natomiast zależność od pola nie różnicuje podatności na badane złudzenia. Związki pomiędzy iluzją Pręta i Ramy a pozostałymi złudzeniami uzyskano dla kąta odchylenia ramy od pionu o 15 stopni.
The answers for three questions were sought: 1) whether people who are susceptible to shape and direction illusions are also most prone to illusions of constancy tilt; 2) whether field-dependent persons compared to field-independent are more susceptible to visual illusions; and 3) whether women are more prone to visual illusions than men. 75 high school students (M = 18.5; SD = 0.5) and 31 psychology students (M = 20; SD = 0.5) participated in the study. The Embedded Figures Test was used as a measure of field dependence-independence, Witkin’s Rod and Frame Test as a measure of the rod and frame illusion, whereas susceptibility to illusions (Zӧllner, Poggendorff, Ponzo, Ebbinghaus, Miller-Lyer) was verified with the use of computer tasks. It was revealed that field dependence/independence did not diversify the susceptibility to illusions mentioned above. The study showed differences in the susceptibility to illusions depending on gender. Women appeared to be more susceptible to Rod and Frame, Poggendorff and Zӧllner illusions than men. Correlations between Rod and Frames illusion and other illusions were obtained for the tilt angle of the frame from the vertical by 15 degrees.
Źródło:
Acta Universitatis Lodziensis. Folia Psychologica; 2015, 19; 43-61
2353-4842
Pojawia się w:
Acta Universitatis Lodziensis. Folia Psychologica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Selection of elastic suspension elements for the special use vehicle
Autorzy:
Borkowski, W.
Michalowski, B.
Paplinski, K.
Rybak, P.
Wysocki, J.
Powiązania:
https://bibliotekanauki.pl/articles/242198.pdf
Data publikacji:
2009
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
special vehicle
suspension
spring
elastic element
lateral tilt stabilizer
Opis:
The work analyzes the possibility of using a truck chassis in terms of installing a specific device. As part ofwork was selected the vehicle, identified the necessary geometric parameters and the mass allowing of modernization, with particular emphasis on the required structural changes in the front and rear suspension. To this were used, the developed two phase methodology of calculation of the metal elastic elements (springs) and mechanical lateral tilt stabilizers. Results of numerical calculations are presented in the form of recommendations to redesign of the front and rear suspension. However, in the front suspension should be made a new spring and a mechanical lateral tilt stabilizer, while rear spring suspension meets the requirements in terms of elastic characteristics (adequate the coefficient of rigidity) is requiredonly adjustment of the static deflection of the suspension for example by adjusting the radii of leaf of the spring. Because of the design solution of the driving rear axle (so called driving axle trolley) was not proposed mechanical lateral tilt stabilizer. Paper present diagram of the forces acting on a vehicle with special equipment, results of the calculation loads acting on the suspension components fitted to a lorry with a special device, results of the calculation loads acting on the base vehicle suspension components, the basic parameters of a lorry with special hull and performance graph of the front suspension leaf spring resilience.
Źródło:
Journal of KONES; 2009, 16, 3; 47-54
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of heart rate variability during head-up tilt-test in patients with vasovagal syncope
Autorzy:
Budrejko, Szymon
Kempa, Maciej
Chmielecka, Monika
Kozłowski, Dariusz
Raczak, Grzegorz
Powiązania:
https://bibliotekanauki.pl/articles/895735.pdf
Data publikacji:
2018-09-28
Wydawca:
Gdański Uniwersytet Medyczny
Tematy:
tilt table test
syncope
vasovagal syncope
heart rate variability
Opis:
Introduction: Syncope is defined as transient loss of consciousness, due to decrease in brain perfusion. The most frequent mechanism is vasovagal syncope. In many patients, the cause of syncope remains unspecified, despite an extensive diagnostic work-up. Tilt-test (TT) is an acknowledged diagnostic tool for syncope. Currently, the so-called Italian protocol of TT is most widely used. Vasovagal syncope is caused by impaired circulatory regulation in response to orthostatic stress. One of the available tools to examine the influence of the nervous system on the circulation is the analysis of heart rate variability (HRV). Despite numerous publications concerning HRV parameters and autonomic regulation in patients with syncope, direct comparisons and metaanalysis of the results is impossible, due to variability of TT protocols and study group specifications. Aim of the study: As there is no uniform model of HRV during TT, we aimed to analyze HRV parameters during TT (performed according to the Italian protocol) in patients with vasovagal syncope, in order to determine the possible application of HRV measurements in clinical practice in that group of patients. Detailed objectives were: (1) analysis and comparison of HRV in patients with and without the history of syncope; (2) analysis of HRV changes in consecutive stages of TT; (3) identification of possible HRV differences between patients with positive and negative TT results. Materials and methods: Patients between 18 and 50 years of age were qualified for the study, if they had a history of at least 2 incidents of syncope or presyncope within the preceeding 6 months, and if signs and symptoms indicated the vasovagal mechanism. The study group included 150 patients: 100 consecutive patients with a postive TT result (POS), and 50 consecutive patients with a negative TT result (NEG). The control group (CG) comprised 50 volunteers with no history of syncope nor presyncope, matched according to age and sex to the study group. In all patients a TT was performed according to the Italian protocol, with paced breathing at a rate of 15/min. Time-domain (meanRR, SDNN, RMSSD, pNN50) and frequency-domain (abs_LF, abs_HF, rel_LF, rel_HF, norm_LF, norm_HF, LF/HF) HRV parameters were analyzed and compared at different stages of TT in the study groups as specified above. Results: 100 patients at the age of 18-44 years were included in the POS group, 50 patients at the age of 18-39 years in the NEG group, and 50 volunteers at the age of 20-39 in the CG. Volunteers in the control group developed unexpectedly high percentage of positive TT (14 patients). For consistency of analysis, the CG was thus subdivided according to the result of the TT into CG_POS (positive result of TT) – 14 patients, and CG_NEG (negative result of TT) – 36 patients. Based on HRV analaysis, no significant differences in HRV values were noted between patients with a history of syncope and positive or negative result of TT. Upright tilt resulted in HRV changes of the same direction and value in syncopal patients in the POS and NEG goup, as well as in patients in the CG_NEG group. Conclusion: HRV values and changes of those values at subsequent stages of TT were not different between syncopal patients with postive or negative TT result, or negative TT control group. The Italian protocol of TT may be associated with a surprisingly high percentage of false positive results.
Źródło:
European Journal of Translational and Clinical Medicine; 2018, 1, 1; 26-38
2657-3148
2657-3156
Pojawia się w:
European Journal of Translational and Clinical Medicine
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Tilt-shift eddy current probe impact on information value of response signal
Autorzy:
Chudacik, V.
Smetana, M.
Powiązania:
https://bibliotekanauki.pl/articles/140578.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
eddy current testing
eddy current probe
response signals
tilt-shift probe
Opis:
This article deals with the possibility for increasing of the informational value of a response signal using tilt-shift eddy current probe. Numerical simulations based on the FEM method using the OPERA 3D software as well as gained experimental results are presented. The simulated cracks are evaluated at the selected eddy current probe tilts and shifts with respect to conductive plate to obtain additional data needed for its evaluation and localization. Obtained simulation results are compared and discussed with the experimental results.
Źródło:
Archives of Electrical Engineering; 2016, 65, 1; 133-140
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of propiconazole (Tilt 250 EC) and Drechslera poae on germination capacity of Kentucky blue grass
Autorzy:
Czembor, Elżbieta
Powiązania:
https://bibliotekanauki.pl/articles/2198997.pdf
Data publikacji:
2005-12-22
Wydawca:
Instytut Hodowli i Aklimatyzacji Roślin
Tematy:
leaf spot and melting out
Poa pratensis L.
propiconazole (Tilt 250 EC)
seed germination
Opis:
The effect of leaf spot and melting out disease and chemical control on seed quality of Kentucky bluegrass was investigated over two seasons in three treatments: natural infection, inoculation by Drechslera poae and Tilt 250 EC (propiconazole) application. Disease incidence in the treatment with natural infection was low and in the treatment with inoculation was much heavier. Application of propiconazole and occurrence of leaf spot and melting out disease not affected germination capacity of Kentucky bluegrass. Future experiments are needed to confirm obtained results.
Źródło:
Plant Breeding and Seed Science; 2005, 52; 29-34
1429-3862
2083-599X
Pojawia się w:
Plant Breeding and Seed Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Deformation and damage to buildings caused by ground movements in mining areas (case study)
Autorzy:
Florkowska, Lucyna
Bryt-Nitarska, Izabela
Kruczkowski, Janusz
Powiązania:
https://bibliotekanauki.pl/articles/2073381.pdf
Data publikacji:
2021
Wydawca:
Centrum Rzeczoznawstwa Budowlanego Sp. z o.o.
Tematy:
building damage
mining areas
subsoil deformations
tilt measurement anthropocene
szkody budowlane
tereny górnicze
deformacje podłoża gruntowego
pomiary nachylenia antropocenu
Opis:
Human activity causes transformations in the near-surface layers of the rock mass, which result in long-term impacts on buildings and engineering infrastructure. Mining activities are particularly disadvantageous in this context, as they trigger severe deformation processes that reach the soil surface as a result of the excavation of deposits. The prevention of accidents and disasters caused by these impacts is based on knowledge derived from observation. Therefore, the aim of this study was to acquire and update knowledge on the impact of mining-related ground deformation and tremors on buildings. The paper presents the results of measurements carried out on a group of buildings located in an underground mining area. The buildings have been affected by mining impacts since their construction in the 1980s. Despite the implementation of appropriate structural protection, the structures have been suffering deformation and damage. For the purposes of the study, two two-axis inclinometers were installed on the 15.2 m high bell tower, taking measurements at 6-hour intervals. Over a period of 10 months, changes in the leaning of the tower were measured and the condition of the other buildings observed. The study resulted in obtaining: values for the change in tilt of the two perpendicular walls of the tower (over a period of 10 months),correlation of the results with tremors measurements and periodic surveying measurements of the inclination of the vertical edge of the tower, image of damage to buildings caused by mining deformation of the ground. On the basis of an analysis of the location and timing of minefields excavation, the occurrence of real ground movement in the mining areas, continuing even after the end of mining works, was confirmed and irregular deformation of the originally perpendicular walls of the masonry tower building was demonstrated. The tower did not behave as a rigid body; its horizontal profile was deformed.
Źródło:
Inżynieria Bezpieczeństwa Obiektów Antropogenicznych; 2021, 4; 52--63
2450-1859
2450-8721
Pojawia się w:
Inżynieria Bezpieczeństwa Obiektów Antropogenicznych
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Making virtual reality accessible for language learning: applying the VR application analysis framework
Autorzy:
Frazier, Erin
Lege, Ryan
Bonner, Euan
Powiązania:
https://bibliotekanauki.pl/articles/2097445.pdf
Data publikacji:
2021
Wydawca:
Uniwersytet Marii Curie-Skłodowskiej w Lublinie. IATEFL Poland Computer Special Interest Group
Tematy:
virtual reality
VR Application Analysis Framework
immersive capacity
communicative capability
CALL
Tilt Brush
Opis:
Virtual Reality (VR) is a valuable tool for learning, however, there is a lack of education-focused content for language learning needs. This article introduces the VR Application Analysis Framework (Lege, Bonner, Frazier, & Pascucci, 2020) to assist educators in scaffolding existing commercial off-the-shelf (COTS) applications for use in classroom activities through four key lenses: immersive capacity, cognitive load, purpose, and communicative capability. The framework is then used to analyze the strengths and weaknesses of an example COTS VR application, Tilt Brush. This analysis, completed using the framework, is followed by three lesson plans for Tilt Brush that demonstrate how VR could be used in the language classroom.
Źródło:
Teaching English with Technology; 2021, 21, 1; 131-143
1642-1027
Pojawia się w:
Teaching English with Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The performance analysis of dusty photovoltaic panel
Autorzy:
Katoch, Minakshi
Dahiya, Vineet
Yadav, Surendra Kumar
Powiązania:
https://bibliotekanauki.pl/articles/27312227.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:
dust accumulation
tilt angle
photovoltaics
solar panel
transmittance
Opis:
Solar photovoltaic power is widely utilized in the energy industry. The performance of solar panels is influenced by different variables, including solar radiation, temperature, wind speed, relative humidity and the presence of haze or dirt. Outdoor solar panels are particularly susceptible to a decrease in energy efficiency due to the accumulation of dust particles in the air, which occurs as a result of natural weather conditions. The extent of dust deposition is primarily determined by factors such as the tilt angle of the panel, wind direction, cleaning frequency as well as local meteorological and geographical conditions. The dust on the solar cell glazing reduces the optical transmittance of the light beam, causing shadowing and diminishing the energy conversion productivity of the panels. Sand storms, pollution levels and snow accumulations all significantly impact the photovoltaic panel performance. These circumstances reduce the efficiency of solar panels. The experiment was carried out on two identical dust-accumulated and dust-free panels. The evaluation was carried out in two different situations on the offgrid stand-alone system: in a simulated atmosphere and in an open space during the day. The current-voltage curves have been developed for both panels at various tilt degrees. The features provide sufficient information to analyse the performance of the panels under consideration. The measurements demonstrate that as dust collects on the panel’s surface, the average output power and short circuit current decrease dramatically. The installation tilt angle affected the ratio of efficiency and average power outputs of dusty and clean panels.
Źródło:
Archives of Thermodynamics; 2023, 44, 2; 49--68
1231-0956
2083-6023
Pojawia się w:
Archives of Thermodynamics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Lombard Effect in Polish Speech and its Comparison in English Speech
Autorzy:
Kleczkowski, P.
Żak, A.
Król-Nowak, A.
Powiązania:
https://bibliotekanauki.pl/articles/177703.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
lombard effect
speech production
Polish speech
speech level
fundamental frequency of speech
spectral tilt
Opis:
The first extensive investigation on the Lombard effect with Polish speech has been performed. Characteristic parameters of Lombard speech were measured: intensity, fundamental frequency, spectral tilt, duration of words, duration of pauses and duration of vowels. The effect was investigated in a task involving real communication – solving a Sudoku puzzle. The speakers produced speech in quiet and in three different backgrounds: competing speech, speech-shaped noise and speech-modulated noise. The experimental conditions were held as close as possible to those in the study by Cooke and Lu (2010) so that conclusions could be drawn whether differences between the Lombard effect in Polish speech and English speech existed. Most of the findings on the Lombard effect known from the literature have been confirmed with Polish speech. In three parameters, Polish speakers were more sensitive to modulated backgrounds while English speakers were more sensitive to a stationary background. In both languages, the modulated backgrounds induced speakers to extend pauses in the communication tasks.
Źródło:
Archives of Acoustics; 2017, 42, 4; 561-569
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
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