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X. D. Wang, J. J. Liu and F. S. Sheng

Information, Vol. 25, 2006, No 2, 163-171 (in Chinese). 4. Zhang, Qin, Ma Feicheng. An Approach to the Structure Map of Knowledge Management Research in China: A Bibliometric Analysis. - Journal of the China Society for Scientific and Technical Information, Vol. 27, 2008, No 1, 93-101 (in Chinese). 5. Sun, Xiaoning, Chu Jiewang. On Hotspots of Master and Ph. D. Degree's Dissertations in the Field of Knowledge Management during the Last Decade: A Co-Words Analysis. - Journal of Intelligence, Vol. 6, 2012, 85-90 (in Chinese). 6

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Binglu Wang, Yi Bu and Win-bin Huang

1 Introduction Author co-citation analysis (ACA) was first proposed by Drs.H. D. White and B. C. Griffith in 1981. As a significant branch of scientometrics, the main purpose of ACA is to map scientific domains by pointing out the relationship of co-cited authors ( McCain, 1990 ). The past decades have witnessed the growth and development of ACA, which has been applied extensively in various domains, such as library and information science ( Anegón et al., 1998 ), computer science ( Eom, 1998 ), management science ( Charve et al., 2008 ), psychology ( Bruer

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Jahar Sarkar and Souvik Bhattacharyya

References [1] Neksa P.: CO 2 heat pump systems . Int. J. Refrigeration 25(2002), 421-427. [2] Kim M.H., Pettersen J., Bullard C.W.: Fundamental process and system designissues in CO 2 vapor compression systems . Prog. Energ. Combust. Sci. 30(2004), 119-174. [3] Austin B.T., Sumathy K.: Transcritical carbon dioxide heat pump systems: Areview . Renew. Sust. Energ. Rev. 15(2011), 4013-4029. [4] Neksa P., Rekstad H., Zakeri G.R., Schiefloe P.A.: CO 2 heat pump waterheater

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Milan Škorupa, Tomáš Čechovič, Martin Kendra and Borut Jereb

827/meta , access May 5, 2018] Ellerman A. D. et al. (2015). The European Union Emissions Trading System: Ten Years and Counting [available at: https://academic.oup.com/reep/article-pdf/10/1/89/.../rev014.pdf , access August 15, 2018] EN 16258, 2012 (2012). Methodology for calculation and declaration of energy consumption and GHG emissions of transport services (freight and passengers) Energie-portal, Cena CO 2 povoleniek sa môže vyšplhať až na 100 eur/t do roku 2020 [available at: https://www.energie-portal.sk/Dokument/cena-co2-povoleniek

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Joanna Grzela

. Nowiak, W., Nordycki model “welfare state” w realiach XXI wieku. Dylematy wyboru i ewolucja systemu w społeczeństwach dobrobytu - wnioski praktyczne. Wydawnictwo Naukowe Uniwersytetu Adama Mickiewicza, Poznań 2011. Nybbak, M., The Nordic Region must overcome challenges through solidarity and closer co-operation. Web. 11 May 2015 <http://www.norden.org/en/newsand- events/news/201cthe-nordic-region-must-overcome-challenges-throughsolidarity- and-closer-co-operation201d>. Osiński, J., Modele prawie idealne. “Newsweek”. 8 June 2007. Web. 9

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Leszek Remiorz, Sebastian Rulik and Sławomir Dykas

References [1] Geller D.A., Swift G.W.: Thermodynamic efficiency of thermoacoustic mixture separation . J. Acoust. Soc. Am. 112(2002), 2, 504-510. [2] Swift G.W., Spoor P.S.: Thermal diffusion and mixture separation in the acoustic boundary layer . J. Acoust. Soc. Am. 106(1999), 1794-1800. [3] Swift G.W. and Geller D.A.: Continuous thermoacoustic mixture separation . J. Acoust. Soc. Am. 120(2006), 5, 2648-2657. [4] Kotowicz J., Janusz K.: Ways of CO 2 emissions reduction from energy

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Zehui Shao, Seyed Mahmoud Sheikholeslami, Marzieh Soroudi, Lutz Volkmann and Xinmiao Liu

R eferences [1] H. Abdollahzadeh Ahangar, M.A. Henning, V. Samodivkin and I.G. Yero, Total Roman domination in graphs , Appl. Anal. Discrete Math. 10 (2016) 501–517. doi:10.2298/AADM160802017A [2] S. Arumugam, K. Ebadi and M. Manrique, Co-Roman dominaton in graphs , Proc. Indian Acad. Sci. Math. Sci. 125 (2015) 1–10. doi:10.1007/s12044-015-0209-8 [3] R.A. Beeler, T.W. Haynes and S.T. Hedetniemi, Double Roman domination , Discrete Appl. Math. 211 (2016) 23–29. doi:10.1016/j.dam.2016.03.017 [4] E.W. Chambers, B. Kinnersley, N

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Halina Pawlak-Kruczek, Michał Ostrycharczyk, Marcin Baranowski, Michał Czerep and Jacek Zgóra

. Prog. Energy Combust. Sci. , 31, 283-307. DOI: 10.1016/j.pecs.2005.07.001. Chen L., Yong Sz., Z., Ghoniem A.F., 2012. Oxy-fuel combustion of pulverized coal: Characterization, fundamentals, stabilization and CFD modeling. Prog. Energy Combust. Sci. , 38, 156-214. DOI: 10.1016/j.pecs.2011.09.003. Grammelis P., Agraniotis M., Kakaras E., 2010. Co-utilization of biomass based fuels in pulverized coal power plants in Europe. Handbook of Combustion . 4, 585-608. DOI: 10.1002/9783527628148.hoc071. Kruczek H., Raczka P

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Balasubramaniyan Singaravel and Thangiah Selvaraj

Abstract

Machinability study of a material is used to find the ease and difficulty during machining operation. High Strength Low Alloy (HSLA) medium carbon steel (EN25 steel) is considered to possess better mechanical properties than carbon steel. In this work, an attempt is made to experimentally investigate and realize the machinability of EN25 steel during turning with coated carbide tools. The effects of machining parameters on cutting force components, Specific Cutting Pressure (SCP), co-efficient of friction and shear energy are analysed during the investigation. The results of the investigation revealed that the mentioned machinability characteristics are necessary and essential to evaluate the machinability of HSLA steel effectively.

Open access

Praveenkumar Upadhyay and Vivek Srivastava

References 1. Wang W., Wang S., Ma X. and Gong J., Recent advances in catalytic hydrogenation of carbon dioxide, Chem. Soc. Rev. , 40, 3703–3727 (2011). 2. Olah G. A., Goeppert A. and Prakash G. K. S., Chemical Recycling of Carbon Dioxide to Methanol and Dimthyl Ether: From Greenhouse Gas to Renewable, Environmentally Carbon Neutral Fuels and Synthetic Hydrocarbons, J. Org. Chem. , 74, 487–498 (2009). 3. Xu X. D. and Moulijn J. A., Mitigation of CO 2 by chemical conversion: plausible chemical reactions and promising products, Energy Fuels