Search results

Filters

  • Journals
  • Authors
  • Keywords
  • Date
  • Type

Search results

Number of results: 5
items per page: 25 50 75
Sort by:
Download PDF Download RIS Download Bibtex

Abstract

In the article, mathematical modeling methods are used to study the main trends and macroeconomic determinants of the electric car market development in 2011–2018 on the example of the US. The determinants include economic (GDP), socio-economic (household income), energy (electricity use), and environmental (СО2 emissions) factors. The authors justify the role of electric transport in strengthening national energy security due to the transition to renewable energy technologies and the reduction of fossil fuel use. Based on the constructed linear regression equations, a weak relationship has been revealed between the number of electric vehicles sold and the environmental factor, which can be explained by the small share of electric cars in the US market. The formed multifactor linear model showed a positive impact of both the country’s GDP growth and electricity consumption increase on the number of electric vehicles sold. However, the rise in household incomes negatively influences market development due to insufficient consumer awareness of the electric transport operation benefits, an underdeveloped network of electric vehicle charging stations, etc. Based on the obtained multifactor model, the authors have built optimistic, optimal and pessimistic scenarios for the US electric vehicle market deployment for the next five years. In order to implement the most favorable scenarios, recommendations for market development factors’ management have been made. The results of the study can be used to improve public policy in the US transport and energy sectors, as well as in other countries to optimize the fuel and energy balance, strengthen the energy independence of states by developing clean transport and adapting the model to national specifics.

Go to article

Authors and Affiliations

Iryna Sotnyk
ORCID: ORCID
Daniil Hulak
ORCID: ORCID
Oleksandr Yakushev
ORCID: ORCID
Oksana Yakusheva
ORCID: ORCID
Olha V. Prokopenko
Andrii Yevdokymov
Download PDF Download RIS Download Bibtex

Abstract

The paper presents a method of structural monitoring with the use of angular displacement measurements performed with inclinometer devices. Inclinometer method is a solution free from the basic disadvantages of optical methods used commonly in structural monitoring, such as sensitivity to any type of visibility restrictions, pollution or influence of weather conditions. At the same time, with appropriate sensor parameters, a much better measurement accuracy is obtained than for typical optical methods and very low energy demand and moderate costs are achieved. Taking into account the above-mentioned issues, in the first stage an appropriate MEMS-type inclinometer sensor was selected, its laboratory tests were carried out and a method of the offset temperature drift correction, individual for each sensor, was developed.

Go to article

Authors and Affiliations

S. Wierzbicki
Z. Pióro
M. Osiniak
E. Antoszkiewicz
Download PDF Download RIS Download Bibtex

Abstract

The present theoretical study is concerned with the analysis of surface roughness effects on the steady-state performance of stepped circular hydrostatic thrust bearings lubricated with non-Newtonian fluids: Rabinowitsch fluid model. To take the effects of surface roughness into account, Christensen’s theory for rough surfaces has been adopted. The expression for pressure gradient has been derived in stochastic form employing the energy integral approach. Results for stochastic film pressure and load-carrying capacity have been plotted and analyzed based on numerical results. Due to surface roughness, significant variations in the theoretical results of these properties have been observed.
Go to article

Bibliography

[1] U.P. Singh, R.S. Gupta, and V.K. Kapur. On the steady performance of hydrostatic thrust bearing: Rabinowitsch fluid model. Tribology Transactions, 54(5):723-729, 2011. doi: 10.1080/10402004.2011.597541.
[2] U.P. Singh, R.S. Gupta, and V.K. Kapur. On the application of Rabinowitsch fluid model on an annular ring hydrostatic thrust bearing. Tribology International, 58:65-70, 2013. doi: 10.1016/j.triboint.2012.09.014.
[3] U.P. Singh, R.S. Gupta, and V.K. Kapur. On the steady performance of annular hydrostatic thrust bearing: Rabinowitsch fluid model. Journal of Tribology, 134(4):044502, 2012. doi: 10.1115/1.4007350.
[4] B.J. Hamrock, S.R. Schmid, and B.O. Jacobson. Fundamentals of Fluid Film Lubrication. CRC Press, 2004. doi: 10.1201/9780203021187.
[5] R. Bassani and P. Piccigallo. Hydrostatic Lubrication, Elsevier, 1992.
[6] J.A. Coombs and D. Dowson. An experimental investigation of the effects of lubricant inertia in a hydrostatic thrust bearing. Proceedings of the Institution of Mechanical Engineers, Conference Proceedings, 179(10):96-114, 1964. doi: 10.1243/PIME_CONF_1964_179_270_02.
[7] J. Peterson, W.E. Finn, and D.W. Dareing. Non-Newtonian temperature and pressure effects of a lubricant slurry in rotating hydrostatic step bearing. Tribology Transactions, 37(4):857-863, 1994. doi: 10.1080/10402009408983369.
[8] V.K. Kapur and K. Verma. The simultaneous effects of inertia and temperature on the performance of a hydrostatic thrust bearing. Wear, 54(1):113-122, 1979. doi: 10.1016/0043-1648(79)90050-4.
[9] P. Singh, B.D. Gupta, and V.K. Kapur. Design criteria for stepped thrust bearings. Wear, 89(1):41-55, 1983. doi: 10.1016/0043-1648(83)90213-2.
[10] S.C. Sharma, S.C. Jain, and D.K. Bharuka. Influence of recess shape on the performance of a capillary compensated circular thrust pad hydrostatic bearing. Tribology International, 35(6):347-356, 2002. doi: 10.1016/S0301-679X(02)00013-0.
[11] Z. Tian, H. Cao, and Y. Huang. Static characteristics of hydrostatic thrust bearing considering the inertia effect on the region of supply hole. Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology, 233(1):188-193, 2019. doi: 10.1177/1350650118773944.
[12] Y.K. Younes. A revised design of circular hydrostatic bearings for optimal pumping power. Tribology International, 26(3):195-200, 1993. doi: 10.1016/0301-679X(93)90093-G.
[13] O.J. Bakker and R.A.J. van Ostayen. Recess depth optimization for rotating, annular, and circular recess hydrostatic thrust bearings. Journal of Tribology, 132(1):011103, 2010. doi: 10.1115/1.4000545.
[14] H. Sawano, Y. Nakamura, H. Yoshioka, and H. Shinno. High performance hydrostatic bearing using a variable inherent restrictor with a thin metal plate. Precision Engineering, 41:78-85, 2015. doi: 10.1016/j.precisioneng.2015.02.001.
[15] J.S. Yadav and V.K. Kapur. On the viscosity variation with temperature and pressure in thrust bearing. International Journal of Engineering Science, 19(2):269-77, 1981. doi: 10.1016/0020-7225(81)90027-6.
[16] P. Zhicheng, S. Jingwu, Z. Wenjie, L. Qingming, and C. Wei. The dynamic characteristics of hydrostatic bearings. Wear, 166(2):215-220, 1993. doi: 10.1016/0043-1648(93)90264-M.
[17] J.R. Lin. Static and dynamic characteristics of externally pressurized circular step thrust bearings lubricated with couple stress fluids. Tribology International, 32(4):207-216, 1999. doi: 10.1016/S0301-679X(99)00034-1.
[18] H. Christensen. Stochastic models for hydrodynamic lubrication of rough surfaces. Proceedings of the Institution of Mechanical Engineers, 184(1):1013-1026, 1969. doi: 10.1243/PIME_ PROC_1969_184_074_02.
[19] J. Prakash and K. Tiwari. Effect of surface roughness on the squeeze film between rotating porous annular discs with arbitrary porous wall thickness. International Journal of Mechanical Sciences, 27(3):135-144, 1985. doi: 10.1016/0020-7403(85)90054-2.
[20] P. Singh, B.D. Gupta, and V.K. Kapur. Optimization of corrugated thrust bearing characteristics. Wear, 167(2):109-120, 1993. doi: 10.1016/0043-1648(93)90315-D.
[21] J.R. Lin. Surface roughness effect on the dynamic stiffness and damping characteristics of compensated hydrostatic thrust bearings. International Journal of Machine Tools and Manufacture, 40(11):1671-1689, 2000. doi: 10.1016/S0890-6955(00)00012-2.
[22] A.W. Yacout. The surfacse roughness effect on the hydrostatic thrust spherical bearings performance: Part 3 of 5 - Recessed clearance type of bearings. In Proceedings of the ASME International Mechanical Enginering Congress and Exposition, Volume 9: Mechanical Systems and Control, Parts A, B, and C, pages 431-447, Seattle, Washington, USA, November 11-15, 2007. doi: 10.1115/IMECE2007-41013.
[23] Y. Xuebing, X. Wanli, L. Lang, and H. Zhiquan. Analysis of the combined effect of the surface roughness and inertia on the performance of high-speed hydrostatic thrust bearing. In: Luo J., Meng Y., Shao T., Zhao Q. (eds): Advanced Tribology, 197-201, Springer, 2009. doi: 10.1007/978-3-642-03653-8_66.
[24] A. Walicka, E. Walicki, P. Jurczak, and J. Falicki. Thrust bearing with rough surfaces lubricated by an Ellis fluid. International Journal of Applied Mechanics and Engineering, 19(4):809-822, 2014. doi: 10.2478/ijame-2014-0056.
[25] V.K. Stokes. Couple stress in fluids. The Physics of Fluids, 9(9):1709-1715, 1966. doi: 10.1063/1.1761925.
[26] S. Wada and H. Hayashi. Hydrodynamic lubrication of journal bearings by pseudo-plastic lubricants: Part 2, Experimental studies. Bulletin of JSME, 14(69):279-286, 1971. doi: 10.1299/jsme1958.14.279.
[27] H.A. Spikes. The behaviour of lubricants in contacts: current understanding and future possibilities. Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology, 208(1):3-15, 1994. doi: 10.1243/PIME_PROC_1994_208_345_02.
[28] P. Bourging and B. Gay. Determination of the load capacity of finite width journal bearing by finite element method in the case of a non-Newtonian lubricant. Journal of Tribology, 106(2):285-290, 1984. doi: 10.1115/1.3260906.
[29] H. Hayashi and S. Wada. Hydrodynamic lubrication of journal bearings by pseudo-plastic lubricants: Part 3, Theoretical analysis considering effects of correlation. Bulletin of JSME, 17(109):967-974, 1974. doi: 10.1299/jsme1958.17.967.
[30] H. Hashimoto and S. Wada. The effects of fluid inertia forces in parallel circular squeeze film bearings lubricated with pseudo-plastic fluids. Journal of Tribology, 108(2):282-287, 1986. doi: 10.1115/1.3261177.
[31] J.-R. Lin. Non-Newtonian effects on the dynamic characteristics of one dimensional slider bearings: Rabinowitsch fluid model. Tribology Letters, 10:237-243, 2001. doi: 10.1023/A:1016678208150.
[32] U.P. Singh, R.S. Gupta, and V.K. Kapur. Effects of inertia in the steady state pressurised flow of a non-Newtonian fluid between two curvilinear surfaces of revolution: Rabinowitsch fluid model. Chemical and Process Engineering, 32(4):333-349, 2011. doi: 10.2478/v10176-011-0027-1.
[33] J.R. Lin. Non-Newtonian squeeze film characteristics between parallel annular disks: Rabinowitsch fluid model. Tribology International, 52:190-194, 2012. doi: 10.1016/j.triboint. 2012.02.017.
[34] U.P. Singh. Application of Rabinowitsch fluid model to pivoted curved slider bearings. Archive of Mechanical Engineering, 60(2):247-266, 2013. doi: 10.2478/meceng-2013-0016.
[35] U.P. Singh and R.S. Gupta. Dynamic performance characteristics of a curved slider bearing operating with ferrofluids. Advances in Tribology, 2012:1-6, 2012. doi: 10.1155/2012/278723.
[36] U.P. Singh, R.S. Gupta, and V.K. Kapur. On the squeeze film characteristics between a long cylinder and a flat plate: Rabinowitsch model. Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology, 227(1):34-42, 2013. doi: 10.1177/1350650112458742.
[37] S.C. Sharma and S.K. Yadav. Performance of hydrostatic circular thrust pad bearing operating with Rabinowitsch fluid model. Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology, 227(11):1272-1284, 2013. doi: 10.1177/1350650113490147.
[38] Y. Huang and Z. Tian. A new derivation to study the steady performance of hydrostatic thrust bearing: Rabinowitch fluid model. Journal of Non-Newtonian Fluid Mechanics, 246:31-35, 2017. doi: 10.1016/j.jnnfm.2017.04.012.
[39] U.P. Singh, P. Sinha, and M. Kumar. Analysis of hydrostatic rough thrust bearing lubricated with Rabinowitsch fluid considering fluid inertia in supply region. Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tibology, 235(2):386-395, 2021. doi: 10.1177/1350650120945887.
[40] A. Cameron. Basic Lubrication Theory, 3rd edition. E. Horwood, 1981.
Go to article

Authors and Affiliations

Udaya P. Singh
1
ORCID: ORCID

  1. Rajkiya Engineering College, Sonbhadra, Uttar Pradesh, India
Download PDF Download RIS Download Bibtex

Abstract

The European Commission Green Paper, among other documents, describes the ongoing integration of the EU maritime policy with respect to financing and finance management. Both the Programme to support the further development of an Integrated Maritime Policy and the European Fisheries Fund are to remain operative until at least the end of 2013. The Commission, however, has proposed to merge those instruments into European Maritime and Fisheries Fund. The article provides description of the integration process and allows for an assessment of its progress.

Go to article

Authors and Affiliations

Zbigniew Godecki
Marta Bizewska
Download PDF Download RIS Download Bibtex

Abstract

Wojciech Józef Burszta (1957–2021) was one of the most prominent Polish anthropologists. He specialized in the theory and methodology of ethnology, cultural anthropology, cultural studies, folk and popular culture, and anthropology of the present. He is the author of several hundred works in these fields. The importance of his achievements for cultural studies is unquestionable. His researches largely defined the shape of Polish cultural anthropology. In 1979, he graduated from ethnography at the Historical Faculty at Adam Mickiewicz University. In 1984, he received his PhD in Ethnology. In 1993, he obtained a readership (habilitation) and in 1998 he became a professor. He played an important role in the community of cultural researchers. He was a member of the Committee on Ethnological Sciences of the Polish Academy of Sciences, the Committee on Polish Diaspora of the Polish Academy of Sciences, and the Cultural Sciences Committee of the Polish Academy of Sciences (member and chairman). His activity in scientific life also included participation in scientific societies: the Polish Folk Society and the Polish Cultural Studies Society, the Polish Sociological Society and the European Association of Social Anhtropology. He worked in scientific councils and editorial committees of Polish and international journals.
Go to article

Authors and Affiliations

Jan Grad
1

  1. Wydział Antropologii i Kulturoznawstwa, Uniwersytet im. Adama Mickiewicza w Poznaniu

This page uses 'cookies'. Learn more