• Refine Query
  • Source
  • Publication year
  • to
  • Language
  • 850
  • 777
  • 184
  • 149
  • 107
  • 82
  • 31
  • 22
  • 20
  • 16
  • 15
  • 11
  • 11
  • 10
  • 9
  • Tagged with
  • 2579
  • 545
  • 216
  • 177
  • 165
  • 154
  • 140
  • 131
  • 124
  • 123
  • 122
  • 113
  • 100
  • 98
  • 95
  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Arch expansion predictability with Invisalign

Houle, Jean-Philippe 08 April 2016 (has links)
OBJECTIVES: To investigate the predictability of transverse changes with Invisalign®. MATERIALS AND METHODS: Sixty-four adult Caucasians patients were selected to be part of this retrospective study. Pre and post-treatment digital models created from an iTero® scan were obtained from a single orthodontist practitioner. Linear values of upper and lower arch widths were measured for canines, premolars and first molars. RESULTS: For every maxillary measurement, there was a statistically significant difference between Clincheck® and final outcome. (P < .05) For every lower arch measurement at the gingival margin, there was a statistically significant difference between the Clincheck® planned expansion and the final outcome. (P < .05) CONCLUSIONS: The mean accuracy of expansion planned with Invisalign® for the maxilla was 72.8%, (82.9% for the cusp tips and 62.7% for the gingival margins.) Lower arch presented an overall accuracy of 87.7%, (98.9 % for the cusp tips and 76.4% for the gingival margins.) / May 2016
2

DIMENSIONAL STABILITY OF LOW EXPANSIVITY MATERIALS--TIME DEPENDENT CHANGES IN OPTICAL CONTACT INTERFACES AND PHASE SHIFTS ON REFLECTION FROM MULTILAYER DIELECTRICS

Berthold, John William, 1945- January 1976 (has links)
No description available.
3

Ultra-precise measurement of thermal expansion coefficients

Bradford, James N., 1926- January 1969 (has links)
No description available.
4

An inverse approach to coefficient of thermal expansion optimization in optical structures

Rassi, Erik Michael. January 2007 (has links) (PDF)
Thesis (M.S.)--Montana State University--Bozeman, 2007. / Typescript. Chairperson, Graduate Committee: Christopher H. M. Jenkins. Includes bibliographical references (leaves 94-96).
5

Ueber die Abhängigkeit des thermischen Ausdehnungskoeffizienten von der Temperatur beim Quarz und einigen Gläsern mit anomal sich änderndem Elastizitätsmodul ...

Auffenberg, Johannes Wilhelm, January 1905 (has links)
Inaug.-diss.--Jena. / Vita.
6

Cold Working Holes in Multi-Layer Members

Connolly, Kevin Bryan 09 October 2014 (has links)
Increasing the life cycle of critical components is a common goal in many vehicle industries. One of the most common ways to increase the fatigue resistance of fasteners holes is the process of cold expansion. This method introduces a compressive stress field in the region around the hole that slows the propagation of cracks. Determining the life cycle benefits gained from cold expansion is difficult due to the complex nature of the residual stress field. Many groups have attempted to accurately predict how this field is generated and what factors can cause major variations in the resulting stress field. There are still many factors related to the cold expansion process that have not been quantified. By creating a script in the computer language Python it was possible to generate a number of different models quickly and efficiently in the finite element program Abaqus. While not all the models that could be created were initially found to be convergent, the script proved useful in creating a varied number of models to assist in determining which factors were leading to the convergence problems. Confidence in the script's ability to produce accurate models was established by generating models that mirrored the conditions found in other literature, so that a direct comparison of results could be made. For this work two factors were considered for analysis, the effect of starting hole size and multi-layer expansion. The results showed that even within the range of recommended starting hole sizes, a difference in the residual stress field was evident. If the hole was expanded beyond the recommended size a threshold was reached and a severe weakening of the residual stress field was noticed. In the case of two plate expansion, changes in the residual stress field were only observed at the interface region of the plates. For the entrance face of the second plate in the expansion, this change was highly beneficial. The results from the two plate expansion suggest that artificially creating a multi-layer stack-up may be a useful tool to improve the residual stress field at the entrance surface of a plate. / Ph. D.
7

Comparisons and modelling of primary vacuum standards

Music, Vesna January 1999 (has links)
No description available.
8

A comparison of dental and skeletal changes between rapid palatal expansion and nickel titanium palatal expansion

Ciambotti, Christopher. January 1999 (has links)
Thesis (M.S.)--West Virginia University, 1999. / Title from document title page. Document formatted into pages; contains x, 135 p. : ill. Includes abstract. Includes bibliographical references (p. 88-91).
9

Rapid maxillary expansion long-term hard tissue profile and dental arch width changes /

Aynaciyan, Raffi J., January 1998 (has links)
Thesis (M. Cl. D.)--University of Western Ontario, 1998. / eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references.
10

Short-term and long-term effects of rapid maxillary expansion a postanterior cephalometric and morphometric evaluation : a thesis submitted in partial fulfillment ... for the degree of Master of Science in Orthodontics ... /

Cameron, Christopher. January 2000 (has links)
Thesis (M.S.)--University of Michigan, 2000. / Includes bibliographical references.

Page generated in 0.0793 seconds