Repository of University of Nova Gorica

Search the repository
A+ | A- | Help | SLO | ENG

Query: search in
search in
search in
search in
* old and bologna study programme

Options:
  Reset


1 - 10 / 18
First pagePrevious page12Next pageLast page
1.
Infrared spectra in amorphous alumina
Luigi Giacomazzi, Nikita S Shcheblanov, Mikhail E Povarnitsyn, Yanbo Li, Andraž Mavrič, Barbara Zupančič, Jože Grdadolnik, Alfredo Pasquarello, complete scientific database of research data

Abstract: We present a combined study based on experimental measurements of infrared (IR) dielectric function and first-principles calculations of IR spectra and vibrational density of states (VDOS) of amorphous alumina (am-Al₂O₃). In particular, we show that the main features of the imaginary part of the dielectric function ε₂(ω) at ~380 and 630 cm-¹ are related to the motions of threefold coordinated oxygen atoms, which are the vast majority of oxygen atoms in am-Al₂O₃. Our analysis (involving three model structures) provides an alternative point of view with respect to an earlier suggested assignment of the vibrational modes, which relates them to the stretching and bending vibrational modes of AlOₙ (n = 4, 5, and 6) polyhedra. Our assignment is based on the additive decomposition of the VDOS and ε₂(ω) spectra, which shows that: (i) the band at ~380 cm-¹ features oxygen motions occurring in a direction normal to the plane defined by the three nearest-neighbor aluminum atoms, i.e. out-of-plane motions of oxygen atoms; (ii) Al-O stretching vibrations (i.e. in-plane motions of oxygen atoms) appear at frequencies above ~500 cm-¹, which characterize the vibrational modes underlying the band at ~630 cm-¹.
Keywords: amorphous alumina, infrared spectra, first-principles calculations
Published in RUNG: 15.09.2023; Views: 861; Downloads: 7
URL Link to file
This document has many files! More...

2.
v-P[sub]2O[sub]5 "micro-clusters" in P-doped silica studied by a first principles Raman investigation
Luigi Giacomazzi, Layla Martin-Samos, Matjaž Valant, Nicolas Richard, 2019, published scientific conference contribution abstract

Keywords: r-POHC, silica, Raman, first-principles
Published in RUNG: 19.12.2019; Views: 3252; Downloads: 0
This document has many files! More...

3.
Vibrational and structural properties of P2O5 glass: advances from a combined modeling approach
Nikita Shcheblanov, Luigi Giacomazzi, 2019, original scientific article

Keywords: P2O5, phosphate glasses, Raman, first-principles, DFT
Published in RUNG: 29.10.2019; Views: 3104; Downloads: 0
This document has many files! More...

4.
Urban Conservation System in China and Its Improvement by Using Historic Urban Landscape Approach
Chen Shujie, 2018, doctoral dissertation

Abstract: In the last few decades, the Modern Conservation Movement has developed from European-limited practices into a global movement with universal common views and practical measures for managing heritage resources in different cultural contexts. As an innovative idea of this movement, the Historic Urban Landscape approach aims to protect and manage historic urban environments with respect to both the fundamental principles in the international doctrines and the local social/cultural/historical contexts. It recommends local authorities to use the HUL toolkit to identify, conserve and manage the overall landscape of their historic cities. In the case of China, who is an old civilization, a modern nation and a socialist country at the same time, the conservation practice needs to follow the basic and common conservation principles in the international doctrines, and meanwhile, it shall make its initiatives based on the actual social, cultural and political situations. The establishment of Historically and Culturally Famous City (HCF City in short) system is a positive attempt for such a purpose. The system manages various urban elements relating to the city’s historical and cultural features under a comprehensive notion of HCF City. However, the system is not prefect because it depends excessively on the top-down management of local governments, and also because it overlooks the spatial and spiritual relationships among the protected elements... The thesis provides a big picture of architectural and urban conservation practices in China. It introduces the forming process and the characteristics of historic urban fabric, as well as the history of urban conservation. Then, it takes a deep look at the existing HCF City system, including its basic ideas, structures and mechanism. It analyses the system’s initiatives and deficiencies. Finally, it provides feasible advices to improve the current system by using the HUL toolkit.
Keywords: Urban, History, Heritage, Conservation, Management International Principles, Modern Conservation Movement, Globalization, Localization Historic Urban Area, Historically and Culturally Famous Cities, Conservation System, Historic Urban Landscape Chinese Architecture, Chinese Urban Planning, Conservation History, Policy
Published in RUNG: 11.02.2019; Views: 4129; Downloads: 48
.pdf Full text (217,96 MB)

5.
6.
First-principles investigation of gypsum under pressure
Luigi Giacomazzi, Sandro Scandolo, 2009, published scientific conference contribution abstract

Keywords: gypsum, first-principles, Raman, high-pressure
Published in RUNG: 02.11.2018; Views: 2947; Downloads: 0
This document has many files! More...

7.
Generalized stacking fault energy surfaces and dislocation properties of coesite
Luigi Giacomazzi, Sandro Scandolo, 2009, published scientific conference contribution abstract

Keywords: coesite, first-principles, dislocations, sio2
Published in RUNG: 02.11.2018; Views: 3223; Downloads: 0
This document has many files! More...

8.
Paramagnetic centers in amorphous GeO2
Luigi Giacomazzi, Layla Martin-Samos, Nicolas Richard, 2015, published scientific conference contribution abstract

Keywords: Ge-E' centers, first-principles, EPR, GeO2
Published in RUNG: 25.10.2018; Views: 3537; Downloads: 0
This document has many files! More...

9.
Paramagnetic H-related defects in silica: a first-principles investigation
Luigi Giacomazzi, Layla Martin-Samos, Nicolas Richard, 2016, published scientific conference contribution

Keywords: silica, EPR, E'beta, first-principles, hydrogen related defects
Published in RUNG: 16.10.2018; Views: 3764; Downloads: 0
This document has many files! More...

10.
Medium Range Structure of Tetrahedrally-Bonded Glasses through the First Principles Investigation of Raman spectra
Luigi Giacomazzi, Alfredo Pasquarello, 2012, published scientific conference contribution

Keywords: silica, germania, glasses, Raman, first-principles
Published in RUNG: 16.10.2018; Views: 3932; Downloads: 0
This document has many files! More...

Search done in 0.06 sec.
Back to top