Experimental study of matrix carbon field-emission cathodes and computer aided design of electron guns for microwave power devices, exploring these cathodes

1997 ◽  
Vol 15 (2) ◽  
pp. 503 ◽  
Author(s):  
Y. A. Grigoriev
Keyword(s):  
Experimental Study ◽  
Field Emission ◽  
Microwave Power ◽  
Computer Aided Design ◽  
Power Devices ◽  
Computer Aided ◽  
Electron Guns ◽  
Field Emission Cathodes ◽  
Aided Design

scholarly journals Comparison of Optical Properties of Laminate Veneers Made of Zolid FX and Katana UTML Zirconia and Lithium Disilicate Ceramics

2020 ◽  
Author(s):  
Fariborz Vafaei ◽  
Alireza Izadi ◽  
Samaneh Abbasi ◽  
Maryam Farhadian ◽  
Zahra Bagheri
Keyword(s):  
Experimental Study ◽  
Optical Properties ◽  
Computer Aided Design ◽  
Composite Resin ◽  
Lithium Disilicate ◽  
Laminate Material ◽  
Computer Aided ◽  
Aided Design ◽  
Laminate Veneers

Objectives: This study aimed to compare the optical properties of Zolid FX, Katana UTML, and lithium disilicate laminate veneers. Materials and Methods: In this in-vitro experimental study, the maxillary left lateral incisor of a phantom received a laminate veneer preparation. An impression was made, and a die was fabricated using dental stone. The die was scanned using a computer-aided design/computer-aided manufacturing scanner. Ten dies were fabricated from each of the A1, A2, and A3 shades of composite resin. Laminate veneers were fabricated using A1 shade of Katana UTML, Zolid FX, and IPS e.max CAD ceramics (n=10) and placed on composite abutments using bleach and white colors of trial insertion paste (TIP). The optical properties were measured at the incisal, middle, and cervical thirds using a spectrophotometer. Data were analyzed using three-way analysis of variance and Tukey’s test. Results: The effect of laminate material on the L*, a*, and b* parameters was significant in all areas (P<0.001), except for the L* parameter in the middle and cervical thirds. All color parameters were affected by TIP color in all three regions in most samples (P<0.05). The effect of composite abutment shade was also significant in most cases (P<0.05). The effect of laminate material, abutment shade, and TIP color on the b* parameter was significant (P<0.001). The L* parameter was almost the same in the two zirconia and lithium disilicate ceramic groups. Conclusion: The composite abutment shade, TIP color, and laminate material should be carefully selected to achieve optimal aesthetics in laminate veneers.

Complex of codes for computer-aided design of electron guns with grid control

2003 ◽  
Author(s):  
A. I. Petrosyan ◽  
V. D. Juravleva ◽  
V. V. Penzyakov ◽  
V. I. Rogovin
Keyword(s):  
Computer Aided Design ◽  
Computer Aided ◽  
Electron Guns ◽  
Aided Design

Research on Measuring Key Errors of Plane-Generated Enveloping Hourglass Worm

2014 ◽  
Vol 945-949 ◽  
pp. 214-218
Author(s):  
Hong Lu ◽  
Zhi Liu
Keyword(s):  
Experimental Study ◽  
Service Life ◽  
Contact Line ◽  
Computer Aided Design ◽  
Measuring Equipment ◽  
Design Principle ◽  
Theoretic Analysis ◽  
Computer Aided ◽  
Aided Design ◽  
Equipment System

Plane-generated double enveloping hourglass worm pair has unique characteristics of double contact line; it has the advantages of wide tooth working area, large bearing capacity, and long service life, etc. However, its development has been restricted by such factors as difficulty in measuring, worse processing precision, etc. In this article, a modeling approach is presented in order to obtain the meshing point’s coordinates of the plane–generated enveloping hourglass worm based on theoretic analysis and computer-aided design principle. And a measuring equipment system is designed to measure the meshing point’s coordinates. Key errors of this worm have been discussed and obtained by comparing the theoretic coordinates and the measuring coordinates. Finally, an experimental study has been carried out to validate the modeling method and measuring equipment system.

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