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Abstract

La teologia praticata nella Chiesa, e sotto la sua direzione, deve avere sempre la coscienza della responsabilit della fede di tutto il Popolo di Dio, e per questo deve adoperarsi di tale insegnamento che non trasgredisce alla dottrina della fede. Non viola questo ± evidentemente ± la libertà della ricerca teologica. Questa libertà dovrebbe però realizzarsi nell’ambito della fede della Chiesa, su cui l’integrità vigila il suo Magistero. Così praticata la teologia può dare il contributo alla formazione cristiana degli studenti. Benchè la teologia possiede il posto privilegiato e responsabile nella formazione dei candidati al sacerdozio, tuttavia non può essere trattata oggi come il privilegio riservato ad essi, alle suore o ad alcuni solo laici, che si preparano all’insegnamento della religione nelle scuole pubbliche. La pastorale accademica, parrocchiale, diocesana, nazionale, come anche internazionale, nella sempre più unita l’Europa, e la collaborazione nell’ambito della ricerca alle nostre facoltà teologiche ed universitarie, dovrebbero fare il fondamento della nostra comune riflessione. La proposta delle aperte lezioni e conferenze alle facoltà teologiche, anche per gli studenti delle altre facoltà universitarie, potrebbe risultare utile per fare l’unione dei differenti ceti sociali, che rimanevano più di una volta chiusi nei propri circoli. Non si può dimenticare, che gli odierni destinatari del messaggio cristiano hanno la loro comprensione culturale ed il loro modo di pensare modellato da una mentalità scientifica e tecnica, che tende a pervadere la pluralità delle culture, che pretendono di appagare i bisogni dell’uomo. In questo contesto, la teologia si sente particolarmente chiamata ad affrontare a livello critico-scientifico il dialogo con la cultura e la scienza, nella convinzione che un messaggio che non si incarna in una cultura storica non viene seriamente accolto. Negli ultimi anni in Polonia, quando si nota la seria apertura delle universit statali alla teologia, si è creato un clima do reciproca stima e ci sono realizzati tanti concreti progetti di collaborazione. E tutto questo è stato possibile fare, perchè alla base di entrambi istituzioni esiste la profonda convinzione, che la teologia, con il suo speciale oggetto di ricerca, esercita il completamento della formazione umana, intellettuale e cristiana dell’uomo.

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Authors and Affiliations

Ks. Czesław Rychlicki
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Abstract

The present paper considers the novel O?on-o?ak bala sak ("Quite a Long Childhood" or "A Long, Long Childhood") by Mostay / Mostaj Karim or Mustay Karim, if transliterated from Russian (1919-2005), a prominent Bashkir writer, poet, publicist and playwright, whose contribution to the Bashkir literature has been honoured with the title of the People's Poet of the Republic of Bashkortostan. Apart from the fact that the work under consideration is within the scope of the author's current research, the reason for choosing exactly this piece of M. Karim's literary work is that it is perhaps the first and best known example of an autobiographic novel written in Bashkir. This fact in turn implies that this novel is a valuable object of linguistic and cultural research.

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Authors and Affiliations

Viacheslav Chernev
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Abstract

Two kaolin ores with the almost same fineness and purity of original kaolinite but possessing different kaolinite crystallinity (Hinckley Index) were selected to study the influence of crystallinity and calcination conditions on the pozzolanic activity of metakaolin after dehydroxylation. The different calcination conditions were conducted by altering the calcination temperature and holding time to obtain different metakaolin samples with different degrees of dehydroxylation. Then pozzolanic activities of metakaolin samples were tested by the modified Chapelle test, Frattini test and strength evaluations. Additionally, the apparent activation energies of two kaolin ores were calculated to study the thermal properties of kaolinite by isoconversional methods followed by iterative computations. The results showed that pozzolanic activities were dependent on the degree of dehydroxylation, except for the metakaolins calcined at 900℃ due to the fact that recrystallization and high pozzolanic activity was conducted by complete dehydroxylation (degree of dehydroxylation ≥ 90%). Moreover, the lower crystallinity of original kaolinite favored the removal of the structural hydroxyls, leading to a reduction of apparent activation energy and increase of pozzolanic activity, indicating that the higher calcination temperature or longer holding time was required during calcination to reach the same degree of dehydroxylation and finally highly ordered kaolinite converted into the less active metakaolinite, which was confirmed by the lower Ca(OH)2 consumption in the modified Chapelle test, higher [CaO] and [OH] in the Frattini test and weaker compressive strength.
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Bibliography

1. Akahira, T. and Sunose, T. 1969. Trans. Joint Convention of Four Electrical Institutes. Paper No. 246. Research Report, Chiba Institute of Technology (Science Technology) 16, pp. 22.
2. ASTM C618:2013. Standard Specification for Fly Ash and Raw or Calcined Natural Pozzolan for Use as a Mineral Admixture in Portland Cement Concrete.
3. Badogiannis et al. 2005 – Badogiannis, E, Kakali, G. and Tsivilis, S. 2005. Metakaolin as supplementary cementitious material: Optimization of kaolin to metakaolin conversion. Journal of Thermal Analysis and Calorimetry 81(2), pp. 49–79.
4. Bich et al. 2009 – Bich, C., Ambroise, J. and Péra, J. 2009. Influence of degree of dehydroxylation on the pozzolanic activity of metakaolin. Applied Clay Science 44(3), pp. 194–200.
5. Cao et al. 2016 – Cao, Z., Cao, Y., Dong, H., Zhang, J. and Sun, C. 2016. Effect of calcination condition on the microstructure and pozzolanic activity of calcined coal gangue. International Journal of Mineral Processing 146, pp. 23–28.
6. Cyr et al. 2006 – Cyr, M., Lawrence, P. and Ringot, E. 2006. Efficiency of mineral admixtures in mortars: quantification of the physical and chemical effects of fine admixtures in relation with compressive strength. Cement and Concrete Research 36, pp. 264–277.
7. Donatello et al. 2010 – Donatello, S., Freeman-Pask, A., Tyrer, M. and Cheeseman, C.R. 2010. Effect of milling and acid washing on the pozzolanic activity of incinerator sewage sludge ash. Cement and Concrete Composites 32, pp. 54–61.
8. EN 196-1:2005. Methods of Testing Cement. Part 1: Determination of strength.
9. EN 196-5:2005. Methods of Testing Cement. Part 5: Pozzolanicity Test for Pozzolanic Cement.
10. Ferraz et al. 2015 – Ferraz, E., Andrejkovičová, S., Hajjaji, W., Velosa, A.L., Silva, A.S. and Rocha, F. 2015. Pozzolanic activity of metakaolins by the french standard of the modified chapelle test: a direct methodology. Acta Geodynamica et Geomaterialia 179, pp. 289–298.
11. Frías et al. 2000 – Frías, M., Sánchez de Rojas, M.I. and Cabrera, J. 2000. The effect that the pozzolanic reaction of metakaolin has on the heat evolution in metakaolin-cement mortars. Cement and Concrete Research 30, pp. 209–216.
12. Galos, K. 2011. Composition and ceramic properties of ball clays for porcelain stoneware tiles manufacture in Poland. Appled Clay Science 51(1), pp. 74–85.
13. Gao et al. 2001 – Gao, Z., Nakada, M. and Amasaki, I. 2001. A consideration of errors and accuracy in the isoconversional methods. Thermochimica Acta 369, pp. 137–142.
14. Janotka et al. 2010 – Janotka, I., Puertas, F., Palacios, M., Kuliffayová, M. and Varga, C. 2010. Metakaolin sand- -blended-cement pastes: rheology, hydration process and mechanical properties. Construction and Building Materials 791, pp. 802–24.
15. Kakali et al. 2001 – Kakali, G., Perraki, T., Tsivilis, S. and Badogiannis, E. 2001. Thermal treatment of kaolin: the effect of mineralogy on the pozzolanic activity. Applied Clay Science 20, pp. 73–80.
16. Kissinger, HE. 1957. Reaction Kinetics in Differential Thermal Analysis. Analytical Chemistry 29(11), pp. 1702–1706.
17. Liu et al. 2000 – Liu, Q, Xu, H. and Zhang, P. 2000. Crystallinity difference for various origin of kaolinites in coal measures. Journal of China Coal Society 25(6), pp. 576–580 (in Chinese).
18. Murat, M. 1983. Hydration reaction and hardening of calcined clays and related minerals I. Preliminary investigation on metakaolinite. Cement and Concrete Research 13, pp. 259–266.
19. NF P18-513:2010. Metakaolin. Pozzolanic addition for concrete. Definitions, specifications and conformity criteria.
20. Ozawa, T. 1965. A New Method of Analyzing Thermogravimetric Data. Bulletin of the Chemical Society of Japan 38(11), pp. 1881–1886.
21. Qiu et al. 2014 – Qiu, X., Lei, X., Alshameri, A., Wang, H. and Yan, C. 2014. Comparison of the physicochemical properties and mineralogy of Chinese (Beihai) and Brazilian kaolin. Ceramics International 40, pp. 5397–5405.
22. Sabir et al. 2001 – Sabir, B.B., Wild, S. and Bai, J. 2001. Metakaolin and calcined clays as pozzolans for concrete: a review. Cement and Concrete Composites 23, pp. 441–454.
23. Saikia et al. 2002 – Saikia, N., Sengupta, P., Gogoi, P.K. and Borthakur, P.C. 2002. Kinetics of dehydroxylation of kaolin in presence of oil field effluent treatment plant sludge. Applied Clay Science 22, pp. 93–102.
24. Samet et al. 2007 – Samet, B., Mnif, T. and Chaabouni, M. 2007. Use of a kaolinitic clay as a pozzolanic material for cements: Formulation of blended cement. Cement and Concrete Composites 29(10), pp. 741–749.
25. Sinthaworn, S. and Nimityongskul, P. 2011. Effects of temperature and alkaline solution on electrical conductivity measurements of pozzolanic activity. Cement and Concrete Composites 33, pp. 622–627.
26. Tironi et al. 2012 – Tironi, A., Trezza, M.A., Irassar, E.F. and Scian, A.N. 2012. Thermal treatment of kaolin: effect on the pozzolanic activity. Procedia Materials Science 1, pp. 343–350.
27. Tironi et al. 2013 – Tironi, A., Trezza, M.A., Scian, A.N. and Irassar, E.F. 2013. Assessment of pozzolanic activity of different calcined clays. Cement and Concrete Composites 37, pp. 319–327.
28. Tironi et al. 2014 – Tironi, A., Trezza, M.A., Scian, A.N. and Irassar, E.F. 2014. Thermal analysis to assess pozzolanic activity of calcined kaolinitic clays. Journal of Thermal Analysis and Calorimetry 117, pp. 547–556.
29. Wild et al. 1996 – Wild, S., Khatib, J.M. and Jones, A. 1996. Relative strength, pozzolanic activity and cement hydration in superplasticised metakaolin concrete. Cement and Concrete Research 26, pp. 1537–1544.
30. Zhang et al. 2015 – Zhang, Y., Xu, L., Seetharaman, S., Liu, L., Wang, X. and Zhang, Z. 2015. Effects of chemistry and mineral on structural evolution and chemical reactivity of coal gangue during calcination: towards efficient utilization. Materials and Structures 48, pp. 2779–2793.

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Authors and Affiliations

Yuanyuan Liu
1
ORCID: ORCID
Qian Huang
1
Liang Zhao
1
Shaomin Lei
2

  1. Yangtze Normal University, Chongqing Engineering Research Center for Structure Full-Life-Cycle Health Detection and Disaster Prevention, China
  2. Wuhan University of Technology, China
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Abstract

The aim of the paper is to explore the process of diphthongization which is known in the literature as Old English Breaking. After the discussion of some earlier solutions proposed by researchers working in different theoretical frameworks, we propose a new solution couched in Element Theory (Backley 2011). The main questions we address in this paper concern the context, the effect of breaking and the interaction between the consonants and the preceding front vowels. Additionally, we explore the internal structure of the consonants triggering breaking and try to fi nd the element which links liquids and the velar fricative. The solution proposed here can help to understand the behaviour of velars and liquids in various phonological processes (both historical and in Modern English).

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Authors and Affiliations

Artur Kijak
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Abstract

Room temperature vulcanized (RTV) silicone rubber is widely used to prevent pollution flashover with its excellent hydrophobicity and hydrophobicity transfer. However, RTV coatings are at the risk of deterioration and failure in heavily polluted operating environment. In this paper, RTV coated insulators with different suspension heights operating in coal ash polluted areaswere sampled. Pollution degree, pollution composition and aging degree of coatings were tested. The result shows that the insoluble pollution contains Al(OH)3 filler precipitated from RTV coating, which indicates the aging of the RTV coating. The top surface coating is more affected by ultraviolet and rainwater than the bottom surface resulting in more serious degradation. As the pollution degree of the lower phase insulator is heavier than that of the upper phase insulator, the erosion effect of pollution on the RTV coating is more intense. The fillers and rubber molecules of RTV continuously precipitate into the pollution layer, leading to further aging. Therefore, the overall aging degree of the lower insulator coating is more serious than that of the upper insulator coating.

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Authors and Affiliations

Lei Lan
Lin Mu
Yu Wang
ORCID: ORCID
Xiaoqing Yuan
Wei Wang
ORCID: ORCID
Zhenghui Li

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