Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 9 of 9 for “"melt crystallization"”.
-
Testing the driving mechanisms for exhumation of the Greater Himalayan zone in eastern Bhutan: Implications of split-stream zircon and monazite geochronology
… zircons typically revealed three generations of crystallization: (1) an inherited or prograde-to-peak metamorphic core; (2) an oscillatory-zoned, intermediate area in some leucocratic samples, interpreted as recording melt crystallization; and/or (3) an outermost, unzoned metamorphic rim around …
-
Evolution of structure and electrical properties during crystallization of rapidly solidified bismuth(4)titanium(3)oxygen(12)
… was prepared by rapid solidification from the melt. Crystallization and microstructure development during heat treatment were investigated. Dielectric and ferroelectric properties were related to microstructure.
-
Characterization of crystallization processes with video imaging
Crystallization processes are extensively utilized for the purification and separation of a variety of final and intermediate products. Despite its widespread use, in the fine chemicals, pharmaceutical and food industries, crystallization still has many unknowns which can affect the purity, quality …
-
Molecular simulation of crystal growth in alkane and polyethylene melts
… tool for understanding the process of polymer crystallization. By using carefully constructed simulations, one can independently observe the two phenomena responsible for melt crystallization: nucleation and growth. This research focuses on modeling the growth process using potentials that are …
-
The Crystallization of Polyetheretherketone (Peek) From the Glass
The effects of melt thermal history on the morphology and kinetics of PEEK crystallized from the glassy state have been investigated. Amorphous PEEK crystallized as aggregates of microcrystals when annealed at temperatures ranging from 145$\sp\circ$C to 200$\sp\circ$C. Heterogeneous nuclei remained …
-
The tectonometamorphic evolution of the Greater Himalayan sequence as exposed in central Nepal and adjacent south-central Tibet
… Changgo culmination in south Tibet indicate that melt crystallization and metamorphism related to crustal thickening occurred at ca. 35 Ma and was succeeded by a second metamorphic episode and syn-kinematic voluminous anatexis at ca. 22 Ma. The upper GHS was thinned vertically by 50% and extended …
-
Integrating in situ Geochronology and Metamorphic Petrology: An Example from the Gruf Complex, European Central Alps
… zircon rims can only be used to date post-UHT melt crystallization and cooling at 32.7 ± 0.7 Ma. The U-Pb zircon ages of variable deformed felsic dikes indicate that the lower crustal UHT rocks were juxtaposed against the midcrustal migmatites between 30 and 27 Ma and contractional deformation …
-
Temporal and petrological constraints of ultrahigh-pressure metamorphism and exhumation of crustal material from mantle depths to Earth's surface: Insights from a large and small ultrahigh-pressure terrane
… two distinct eclogite-facies zircon (re)crystallization events at ca. 409-407 Ma and ca. 402 Ma at localities ~40 km apart. These results support the interpretation that the UHP terrane was subducted and exhumed as a large (30,000 km2) coherent slab of crustal material, but that as this …
-
Crystallization and structure-property investigations of semicrystalline poly(arylene ether) based polymers
This dissertation addresses the crystallization, melting and morphological characteristics of selected high temperature poly(arylene ether) based polymers. The first part deals with the studies carried out on a series of biphenol and hydroquinone based novel poly(ether ether sulfide)s which were …