Search results

Filters

  • Journals
  • Authors
  • Keywords
  • Date
  • Type

Search results

Number of results: 4
items per page: 25 50 75
Sort by:
Download PDF Download RIS Download Bibtex

Abstract

Virtual reality (VR) technology now provides players with immersive and realistic experiences as never before. Spatial presence plays a crucial role in the introduction of immersive experience in a VR environment. Spatial presence is a special feeling of personal and physical presence in the displayed environment. In this study, we found that the first-person perspective (1PP) was more effective in raising the sense of spatial presence that induces immersive experience compared to the third-person perspective (3PP) in a VR shooting game. Moreover, eye blink rate was significantly higher in the 1PP compared with the 3PP. The 1PP game setting was more realistic than the 3PP setting, and may have raised participants’ sense of immersion and facilitated eye blink. These results indicate that eye blink rate is increased by the sense of spatial presence, and can be a good measure of subjective immersive experience in a VR environment. Neuroscientific evidences suggest that dopaminergic system is involved in such emotional experiences and physiological responses.

Go to article

Authors and Affiliations

Tomohide Ishiguro
Cohta Suzuki
Hiroki Nakakoji
Yusuke Funagira
Motoharu Takao
Download PDF Download RIS Download Bibtex

Abstract

Nothing says more about us than what we leave behind. That makes ancient refuse an inexhaustible source of information for archaeologists.
Go to article

Authors and Affiliations

Dariusz Rozmus
1

  1. “Sztygarka” City Museum in Dąbrowa GórniczaInstitute of Law Studies, Humanitas Academyin Sosnowiec
Download PDF Download RIS Download Bibtex

Abstract

Turbulent filling of a mould is one of the ways to introduce extrinsic defects into the cast part that could deteriorate many properties of any casting. The turbulence can be easily eliminated by counter gravity casting. In gravity casting, tapered downsprue, tapered runner is needed such that the mould cavity is filled counter-gravity from the bottom which is the only best way to eliminate turbulence during filling. Tilt casting method also exists which has the potential to quiescently transfer the liquid into the mould cavity. In this work, gravity and tilt casting methods were used to evaluate the tensile properties of Nb grain refined 206 alloy. Three different Nb contents were investigated: 0.025, 0.05 and 0.1 wt% ratios and it was found that 0.05 wt% revealed the highest tensile properties. On the other hand, when the intrusion of surface folded oxides was eliminated during filling, it was found that mechanical properties were increased significantly, and particularly, the toughness was increased by two folds when tilt casting was applied compared to gravity casting.
Go to article

Bibliography

[1] Campbell, J. (2015). Casting handbook: metal casting processes, metallurgy, techniques and design. Butterworth-Heinemann.
[2] Campbell, J. (2006). An overview of the effects of bifilms on the structure and properties of cast alloys. Metallurgical and Materials Transactions. B 37, 857-863. https://doi.org/10.1007/BF02735006.
[3] Campbell, J. (2020). The Mechanisms of Metallurgical Failure: On the Origin of Fracture. Butterworth-Heinemann.
[4] Burford, J.C. & Sokolowski, J. (2007). A study of bubble entrainment as related to runner velocity in aluminum sand castings using the Cosworth process. Materials Science Forum. 539-543, 398-403. https://doi.org/10.4028/ www.scientific.net/MSF.539-543.398.
[5] Byczynski, G., Mackay, R. (2019). The nemak cosworth casting process latest generation. In Shape Casting: 7th International Symposium Celebrating Prof. John Campbell's 80th Birthday (pp. 179-185). Springer International Publishing.
[6] Mirak, A., Divandari, M., Boutorabi, S. & Taylor, J. (2012). Effect of oxide film defects generated during mould filling on mechanical strength and reliability of magnesium alloy castings (AZ91). International Journal of Cast Metals Research. 25(3), 188-194. https://doi.org/10.1179/ 1743133611Y.0000000037.
[7] Tunçay, T., Baytar, F., Tunçay, B., Sunar, T. & Dişpinar, D. (2022). Effects of mold cavity geometry on flow rate and mechanical properties in Al-Si-Mg alloy. Journal of Materials Engineering and Performance. 32(10), 4702-4711. https://doi.org/10.1007/ s11665-022-07412-0.
[8] Teng X, Mae H, Bai Y, Wierzbicki T (2009). Pore size and fracture ductility of aluminum low pressure die casting. Engineering Fracture Mechanics. 76(8), 983-996. https://doi.org/10.1016/j.engfracmech.2009.01.001.
[9] Moradi, A. & Divandari, M. (2023). Effect of bottom gating filling system design on the initial stage of mold filling: a parametric study. International Journal of Metalcasting. 17, 2716-2730. https://doi.org/10.1007/s40962-022-00937-z.
[10] Hsu, F-Y. (2016). Bifilm defect formation in hydraulic jump of liquid aluminum. Metallurgical and Materials Transactions B. 47, 1634-1648. https://doi.org/10.1007/ s11663-016-0656-3.
[11] Hsu, F-Y. & Li, C-L. (2015). Runner systems containing ceramic foam filters quantified by “Area Normalized” bifilm index map. International Journal of Metalcasting. 9, 23-35. https://doi.org/10.1007/BF03355620.
[12] Hsu, F-Y. & Lin, H-J. (2009). A diffusing runner for gravity casting. Metallurgical and Materials Transactions B. 40, 833-842. https://doi.org/10.1007/s11663-009-9272-9.
[13] Hsu, F-Y. & Yang, Y-M. (2012). Confluence weld in an aluminum gravity casting. Journal of Materials Processing Technology. 212(4), 825-840. https://doi.org/10.1016/ j.jmatprotec.2011.11.006.
[14] Hsu, F-Y., Jolly, M.R. & Campbell, J. (2009). A multiple-gate runner system for gravity casting. Journal of Materials Processing Technology. 209(17), 5736-5750. https://doi.org/10.1016/j.jmatprotec.2009.06.003.
[15] Hsu, F-Y., Jolly, M.R. & Campbell, J. (2006). Vortex-gate design for gravity casting. International Journal of Cast Metals Research. 19(1), 38-44. https://doi.org/10.1179/ 136404606225023318.
[16] Hsu, Q.C., Do, A.T., Yeh, K.C. & Ye, J.H. (2014). Improvement on die-casting efficiency and property of aluminum alloy casing. Key Engineering Materials. 625, 518-524. https://doi.org/10.4028/www.scientific.net/ KEM.625.518.
[17] Ahmad, R. & Hashim, M. (2011). Effect of vortex runner gating system on the mechanical strength of Al-12Si alloy castings. Archives of Metallurgy and Materials. 56(4), 991-991.
[18] Ahmad, R. & Talib, N. (2011). Experimental study of vortex flow induced by a vortex well in sand casting. Metallurgical Research & Technology. 108(3), 129-139. https://doi.org/10.1051/metal/2011049.
[19] Majidi, S.H. & Beckermann, C. (2019). Effect of pouring conditions and gating system design on air entrainment during mold filling. International Journal of Metalcasting. 13(2), 255-272. https://doi.org/10.1007/s40962-018-0272-x.
[20] El-Sayed, M., Hassanin. H. & Essa, K. (2016). Bifilm defects and porosity in Al cast alloys. The International Journal of Advanced Manufacturing Technology. 86, 1173-1179. https://doi.org/10.1007/s00170-015-8240-6.
[21] El-Sayed, M.A. (2018). Influence of mould design and hydrogen content on the tensile properties of Al-Mg cast alloys. Journal of Engineering Technology. 6(1), 584-594.
[22] Jezierski, J., Dojka, R. & Janerka, K. (2018). Optimizing the gating system for steel castings. Metals. 8(4), 266, 1-13. https://doi.org/10.3390/met8040266.
[23] Dojka, R., Jezierski, J. & Campbell, J. (2018). Optimized gating system for steel castings. Journal of Materials Engineering and Performance. 27, 5152-5163. https://doi.org/10.1007/s11665-018-3497-1
[24] Remišová, A. The possibilities for reducing reoxidation in gating system. Retrieved May 21, 2023 from https://www.kavs.uniza.sk/images/PDF/ The_possibilities.pdf
[25] Zhao, H., Ohnaka, I. & Zhu, J. (2008). Modeling of mold filling of Al gravity casting and validation with X-ray in-situ observation. Applied Mathematical Modelling. 32(2), 185-194. https://doi.org/10.1016/j.apm.2006.11.009.
[26] Harding, R. (2007). The use of tilt filling to improve the quality and reliability of castings. Foundry Trade Journal. 180(3644), 142-146.
[27] Pease, L.F., Bao, J., Safarkoolan, R., Veldman, T.G., Phillips, N.R.J., McNeff, P.S. & Clayton, C.K. (2021). Flow obstacles minimize surface turbulence in Tilt casting. Chemical Engineering Science. 230, 116104. https://doi.org/10.1016/j.ces.2020.116104.
[28] Pavlak, L. (2008). Effect of filling conditions on the quality of cast aluminum cylinder heads. Metalurgija-Journal of Metallurgy. 14(3), 31-39.
[29] Cox, M. & Harding, R. (2007). Influence of tilt filling on Weibull modulus of 2L99 aluminium investment castings. Materials science and technology. 23(2), 214-224. https://doi.org/10.1179/174328407X157263.
[30] Hamzah, E., Prayitno, D. & Ghazali, M. (2002). Effect of mould tilt angle on the mechanical properties of as-cast aluminum alloy. Materials & Design. 23(2), 189-194. https://doi.org/10.1016/S0261-3069(01)00068-1.
[31] Gokhale, A. & Patel. G. (2005). Origins of variability in the fracture-related mechanical properties of a tilt-pour-permanent-mold cast Al-alloy. Scripta Materialia. 52(3), 237-241. https://doi.org/10.1016/j.scriptamat.2004.09.011.
[32] Sigworth, G.K. & DeHart, F. (2003). Recent developments in the high strength aluminum-copper casting alloy A206. AFS Transactions. 111, 341-354.
[33] Mi, J., Harding, R. & Campbell, J. (2002). The tilt casting process. International Journal of Cast Metals Research. 14(6), 325-334. https://doi.org/10.1080/13640461.2002. 11819450.
[34] Ransing, R., Savino, S. & Lewis. R. (2005). Numerical optimisation of tilt casting process. International Journal of Cast Metals Research. 18(2), 109-118. https://doi.org/10.1179/136404605225022901.
[35] Bolzoni, L., Nowak, M. & Babu, N.H. (2015). Grain refinement of Al–Si alloys by Nb–B inoculation. Part II: application to commercial alloys. Materials & Design. 66(5), 376-383. https://doi.org/10.1016/j.matdes.2014.08.067.
[36] Bolzoni, L., Nowak, M., Babu, N. H. (2015). On the effect of Nb-based compounds on the microstructure of Al–12Si alloy. Materials Chemistry and Physics. 162, 340-345. https://doi.org/10.1016/j.matchemphys.2015.05.076. Nowak, M., Bolzoni, L. & Babu, N.H. (2015). Grain refinement of Al–Si alloys by Nb–B inoculation. Part I: Concept development and effect on binary alloys. Materials & Design. 66, 366-375. https://doi.org/10.1016/j.matdes. 2014.08.066.
[37] Nowak, M., Yeoh, W., Bolzoni, L. & Babu, N.H. (2015). Development of Al–Nb–B master alloys using Nb and KBF4 powders. Materials & Design.75, 40-46. https://doi.org/10.1016/j.matdes.2015.03.010.
[38] Aydogan, F., Dizdar, K. C., Sahin, H., Mentese, E. & Dispinar, D. (2022). Weibull analysis evaluation of Ti, B, Nb and MTS grain refined Al11Si alloy. Materials Chemistry and Physics. 287, 126264. https://doi.org/10.1016/ j.matchemphys.2022.126264.
[39] Xu, J., Li, Y., Hu, B., Jiang, Y., Li, Q. (2019). Development of Al–Nb–B master alloy with high Nb/B ratio for grain refinement of hypoeutectic Al–Si cast alloys. Journal of Materials Science. 54, 23. 14561-14576. https://doi.org/ 10.1007/s10853-019-03915-9.
[40] Sahin, H., & Dispinar, D. (2023). Effect of Rare Earth Elements Erbium and Europium Addition on Microstructure and Mechanical Properties of A356 (Al–7Si–0.3 Mg) Alloy. International Journal of Metalcasting, 1-10
Go to article

Authors and Affiliations

Nuri Palamutcu
1
ORCID: ORCID
Kerem Can Dizdar
1
ORCID: ORCID
Hayati Sahin
2
ORCID: ORCID
Derya Dispinar
1
ORCID: ORCID

  1. Istanbul Technical University, Turkey
  2. Foseco R&D, Netherlands
Download PDF Download RIS Download Bibtex

Abstract

Nic tak nie mówi o nas jak nasze śmieci, dlatego pradawne śmietniki są dla archeologów nieprzebranym źródłem informacji.
Go to article

Authors and Affiliations

Dariusz Rozmus
1

  1. Muzeum Miejskie Sztygarkaw Dąbrowie GórniczejInstytut Nauk Prawnych, Akademia Humanitasw Sosnowcu

This page uses 'cookies'. Learn more