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Vpliv defektov in nereda na fazno obnašanje nematskih in smektičnih termotropnih tekočih kristalov : doktorska disertacijaSvetec, MilanV doktorski disertaciji preučujemo vpliv defektov in nereda, ki ga v opazovani tekoče-kristalni sistem vnesemo z ograjujočimi površinami in dodanimi primesmi. Pri tem se omejimo na enoosne in ... termotropne tekoče kristale. Nered,ki ga vnesemo v sistem, povzroča konflikte v urejenosti strukture in lahko povzroči nastanek topoloških defektov. V prvem delu disertacije se posvetimo preučevanju anihilacije defektov kar vodi do zmanjšanja nereda v sistemu. Osredotočimo se na točkovna defekta v cilindrični kapilari, ki se pri ustreznih začetnih pogojih začneta približevati, in se pretvorita v obročasti strukturi, ki zlomita cilindrično simetrijo. Med trkom se defekta zlijeta v strukturo z enojnim obročem. Glede na velikost nastalega enojnega obroča obstajata dva možna scenarija za končno ravnovesno stanje. Sistem lahko preide v brez-defektno strukturo. Kadar je velikost enojnega obroča ustrezna, se sistem lahko razvije v enakovredno strukturo z dvema linijskima defektoma vzdolž glavne osi kapilare. V drugem delu disertacije obravnavamo sistem z ureditvenim parametrom, ki ima zlomljeno zvezno simetrijo, v katerega smo vnesli statični nered. Z uporabo hipoteze Imry-Ma, ki predvideva vzpostavitev domenske strukture, numerično računamo karakteristike sistema v bližini faznega prehoda. Pri tem ločeno obravnavamo homogeno in nehomogeno domensko strukturo. Z nehomogeno strukturo, kjer velikosti domen ustrezajo Gaussovi porazdelitvi, razložimo profile odzivnih funkcij. V zadnjem delu se osredotočimo na pojav fazne separacije kjer sistem vsebuje odzivni nered. Za binarni sistem tekoči kristal - primesi, na podlagi ustreznih enačb, numerično računamo fazne diagrame. Pri tem preučujemo sistem s spreminjanjem velikosti dodanih primesi, jakosti sklopitve med tekoče-kristalnimi molekulami in delci primesi ter naklona spreminjanja temperature faznega prehoda zaradi dodanih primesi.Type of material - dissertation ; adult, seriousPublication and manufacture - [S. l. : M. Svetec], 2007Language - slovenianCOBISS.SI-ID - 15732744
Author
Svetec, Milan
Other authors
Kralj, Samo |
Slavinec, Mitja
Topics
fizika |
tekoči kristali |
termotropni tekoči kristali |
defekti |
nered |
disertacije
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Library/institution |
City | Acronym | For loan | Other holdings |
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Miklošič Library FPNM, Maribor | Maribor | PEFMB |
reading room 1 cop.
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National and University Library, Ljubljana | Ljubljana | NUK |
reading room 1 cop.
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not for loan 1 cop.
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Public Institute Library of Gornja Radgona | Gornja Radgona | SIKGRD |
reading room 1 cop.
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Regional and Study Library, Murska Sobota | Murska Sobota | SIKMS |
reading room 1 cop.
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University of Maribor Library | Maribor | UKM |
reading room 1 cop.
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Database name | Field | Year |
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Links to authors' personal bibliographies | Links to information on researchers in the SICRIS system |
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Svetec, Milan | 23592 |
Kralj, Samo | 08612 |
Slavinec, Mitja | 11922 |
Source: Personal bibliographies
and: SICRIS
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