- published: 14 Oct 2013
- views: 23
0:02
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Elucidation of simple pathways for reconstructive phase transitions. I. Quartz-tridymite
Elucidation of simple pathways for reconstructive phase transitions using periodic equi-su...
published: 14 Oct 2013
Elucidation of simple pathways for reconstructive phase transitions. I. Quartz-tridymite
Elucidation of simple pathways for reconstructive phase transitions. I. Quartz-tridymite
Elucidation of simple pathways for reconstructive phase transitions using periodic equi-surface (PES) descriptors. The silica phase system. I. Quartz-tridymite A method of estimating short topological pathways for solid-solid reconstructive phase transitions is proposed. To screen the simplest pathways out of the infinite manifold in configurational space, a Fourier function approach is used, based on periodic nodal (PNS) and periodic equi-surface (PES) descriptors. The simplicity of the chosen functions representing the structures in question and the linear transition approach provide for most simple relevant transition models. Here it is shown that the tetrahedral networks of quartz and tridymite are represented topologically and transformed into each other by this approach. A trigonal network related to [alpha]-ThSi2 and B2O3 appears as intermediate during the transition model of the periodic functions. The transition path found in this way seems to be of exciting directness and of fundamental topological interest. The presented approach is not restricted to this specific case and is expected to be applicable to a wide variety of reconstructive phase transitions of solids. Read the paper here: http://dx.doi.org/10.1107/S0108767300005171- published: 14 Oct 2013
- views: 23
0:16
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How to Pronounce Tridymite
Learn how to say Tridymite correctly with EmmaSaying's "how do you pronounce" free tutoria...
published: 19 Nov 2013
How to Pronounce Tridymite
How to Pronounce Tridymite
Learn how to say Tridymite correctly with EmmaSaying's "how do you pronounce" free tutorials. Definition of tridymite (oxford dictionary): noun [mass noun] a high-temperature form of quartz found as thin hexagonal crystals in some igneous rocks and stony meteorites. Origin: mid 19th century: from German Tridymit, from Greek tridumos 'threefold', from tri- 'three' + -dumos (as in didumos 'twin'), because of its occurrence in groups of three crystals http://www.emmasaying.com/ Take a look at my comparison tutorials here: https://www.youtube.com/user/EmmaSaying/videos?view=1 Subscribe to my channel here: https://www.youtube.com/user/EmmaSaying- published: 19 Nov 2013
- views: 0
2:14
![](http://web.archive.org./web/20131216044147im_/http://i1.ytimg.com/vi/scLsXLhc3GA/0.jpg)
Structural constraints on the three-dimensional geometry of simple viruses - 3
Structural constraints on the three-dimensional geometry of simple viruses: case studies o...
published: 14 Oct 2013
Structural constraints on the three-dimensional geometry of simple viruses - 3
Structural constraints on the three-dimensional geometry of simple viruses - 3
Structural constraints on the three-dimensional geometry of simple viruses: case studies of a new predictive tool Understanding the fundamental principles of virus architecture is one of the most important challenges in biology and medicine. Crick and Watson were the first to propose that viruses exhibit symmetry in the organization of their protein containers for reasons of genetic economy. Based on this, Caspar and Klug introduced quasi-equivalence theory to predict the relative locations of the coat proteins within these containers and classified virus structure in terms of T-numbers. Here it is shown that quasi-equivalence is part of a wider set of structural constraints on virus structure. These constraints can be formulated using an extension of the underlying symmetry group and this is demonstrated with a number of case studies. This new concept in virus biology provides for the first time predictive information on the structural constraints on coat protein and genome topography, and reveals a previously unrecognized structural interdependence of the shapes and sizes of different viral components. It opens up the possibility of distinguishing the structures of different viruses with the same T-number, suggesting a refined viral structure classification scheme. It can moreover be used as a basis for models of virus function, e.g. to characterize the start and end configurations of a structural transition important for infection. Read the paper here: http://dx.doi.org/10.1107/S0108767312047150- published: 14 Oct 2013
- views: 2
49:14
![](http://web.archive.org./web/20131216044147im_/http://i.ytimg.com/vi/9mhNiBQY9s4/0.jpg)
Mod-01 Lec-21 Lecture-21
Steel Making by Prof.Deepak Mazumdar,Prof.S.C.Koria,Department of Material Science and Eng...
published: 10 Jul 2012
author: nptelhrd
Mod-01 Lec-21 Lecture-21
Mod-01 Lec-21 Lecture-21
Steel Making by Prof.Deepak Mazumdar,Prof.S.C.Koria,Department of Material Science and Engineering,IIT Kanpur.For more details on NPTEL visit http://nptel.ii...- published: 10 Jul 2012
- views: 163
- author: nptelhrd
51:00
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Mod-01 Lec-25 Imperial Smelting Process
Materials and Energy Balance in Metallurgical Processes by Prof. S. C. Koria, Department o...
published: 04 Apr 2012
author: nptelhrd
Mod-01 Lec-25 Imperial Smelting Process
Mod-01 Lec-25 Imperial Smelting Process
Materials and Energy Balance in Metallurgical Processes by Prof. S. C. Koria, Department of Materials Science & Engineering, IIT Kanpur For more details on N...- published: 04 Apr 2012
- views: 1066
- author: nptelhrd
55:31
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Mod-01 Lec-21 Exercise-I Matte Smelting
Materials and Energy Balance in Metallurgical Processes by Prof. S. C. Koria, Department o...
published: 04 Apr 2012
author: nptelhrd
Mod-01 Lec-21 Exercise-I Matte Smelting
Mod-01 Lec-21 Exercise-I Matte Smelting
Materials and Energy Balance in Metallurgical Processes by Prof. S. C. Koria, Department of Materials Science & Engineering, IIT Kanpur For more details on N...- published: 04 Apr 2012
- views: 159
- author: nptelhrd