Impurities and Grain Size Modeling in Recrystallized Silicon

2008 ◽  
Vol 1066 ◽  
Author(s):  
Valeri V. Kalinin ◽  
Alexandre M. Myasnikov ◽  
Vladislav E. Zyryanov
Keyword(s):  
Grain Size ◽  
Quality Control ◽  
Amorphous Silicon ◽  
Computer Aided Design ◽  
Silicon Film ◽  
Calculated Data ◽  
Computer Aided ◽  
Lateral Crystallization ◽  
Aided Design

ABSTRACTIn our previous publications [1, 2 and 3], spreading resistance probe (SRP) measurements for quality control of metal induced lateral crystallization (MILC) of amorphous silicon (a-Si) were studied, and the mechanism of nickel diffusion was simulated using technology computer-aided design (TCAD) modeling.Now, we continue to present the explanation of experimental results by modeling with the Synopsys TCAD package, whereby models for resistivity vs. grain size in implanted recrystallized silicon layers are implemented and compared with experiments.Findings show that the SRP method can be used for the characterization of the MILC process of amorphous silicon and that a comparison of experimental and calculated data allows both a turn from qualitative to quantitative analysis of recrystallized silicon film and an estimate of grain size. It has been found that grain size depends on location in the MILC region and on the time and temperature of recrystallization.

Effect of In-office Bleaching on Color, Translucency, and Whiteness Variations in CAD-CAM Monolithic Materials

2021 ◽  
Author(s):  
RG Fonseca ◽  
RC Peńa ◽  
R Simóes ◽  
AC Ramos ◽  
LN Dovigo
Keyword(s):  
Optical Properties ◽  
Computer Aided Design ◽  
Calculated Data ◽  
Color Difference ◽  
Deionized Water ◽  
Stain Removal ◽  
Computer Aided ◽  
Cad Cam ◽  
Aided Design ◽  
The Impact

SUMMARY Little is known about the impact of bleaching on the optical properties of computer-aided design and computer-aided manufactured (CAD-CAM) monolithic materials. The aim of the present study was to evaluate the effect of one session of in-office bleaching on stain removal, staining susceptibility, translucency, and whiteness variations of CADCAM monolithic materials. Disks were fabricated from Lava Ultimate (LU), Vita Enamic (VE), Vita Suprinity (VS), and IPS e.max CAD (IPS). A spectrophotometer was used to register Commission Internationale de l’Eclairage L*a*b* coordinates. For stain removal, 80 specimens from each material were assessed at baseline (R0) and after immersion in deionized water or coffee for 365 days followed or not by bleaching with 40% hydrogen peroxide (R1). For staining susceptibility, 80 specimens from each material were analyzed at baseline (R0’), and after having been bleached or not and immersed in deionized water or coffee (R1’). Both analyses were calculated as the color difference (ΔE00) between R1-R0 and R1’-R0’, respectively. Differences in translucency (ΔTP00) and whiteness (ΔWID) between R1-R0 and R1’-R0’ were also calculated. Data were analyzed by three-way ANOVA and the Games-Howell post hoc test (α=0.05). Clinical significance was based on 50%:50% perceptibility and acceptability thresholds for ΔE00, ΔTP00 and ΔWID, respectively. Surfaces were analyzed by scanning electron microscopy. Coffee increased ΔE00 in LU, VE, and VS, and decreased their translucency and whiteness, whereas the IPS had only its whiteness affected. Bleaching after immersion in coffee decreased ΔE00 in LU and VE, and increased translucency and whiteness of LU, VE, and VS. No effect was observed on IPS. Bleaching before immersion in coffee decreased translucency of LU, but within the acceptable interval, while VE exhibited lower ΔE00, and became more translucent and less dark. Both VS and IPS were not affected. One session of in-office bleaching benefited optical properties of the previously stained LU, VE, and VS, without increasing their susceptibility to staining or adversely providing clinically unacceptable variations in their translucency and whiteness. All variations exhibited by the IPS were below the perceptible threshold.

Computer Aided Design of Classic External Geneva Mechanism

2014 ◽  
Vol 1036 ◽  
pp. 662-667
Author(s):  
Iulian Stǎnǎşel ◽  
Florin Blaga ◽  
Traian Buidoş
Keyword(s):  
Computer Program ◽  
Computer Aided Design ◽  
Input Data ◽  
3D Model ◽  
Calculated Data ◽  
Computer Aided ◽  
Precise Movement ◽  
Measurement Devices ◽  
Aided Design ◽  
Intermittent Motion

Geneva mechanism is used as a mechanism for transforming rotary motion into intermittent motion and is able to achieve a precise movement and its lock, which makes it usable in many areas, particularly in timer devices, measurement devices, feed mechanisms, positioning mechanisms, pick-up and transport machinery, textile machinery etc. The studied literature showed that, although it has long been known, this mechanism is still interesting for contemporary researchers. The present paper proposes a method of synthesis and a computer-aided kinematic and dynamic analysis for this mechanism. Based on input data, it was developed a computer program that computes the dimensions of components of Geneva mechanism and determines velocity acceleration and displacement of Geneva wheel. The dimensional calculated data were also used to obtain 3D model of the mechanism.

Neural Networks for Modeling the Contact Foot-Shoe Upper

2010 ◽  
pp. 561-573
Author(s):  
M. J. Rupérez ◽  
J. D. Martín ◽  
C. Monserrat ◽  
M. Alcañiz
Keyword(s):  
Neural Networks ◽  
Computer Aided Design ◽  
Characteristic Curve ◽  
Neural Model ◽  
Computer Aided ◽  
Materials Used ◽  
Aided Design ◽  
Footwear Design ◽  
The Relationship

Recently, important advances in virtual reality have made possible real improvements in computer aided design, CAD. These advances are being applied to all the fields and they have reached to the footwear design. The majority of the interaction foot-shoe simulation processes have been focused on the interaction between the foot and the sole. However, few efforts have been made in order to simulate the interaction between the shoe upper and the foot surface. To simulate this interaction, flexibility tests (characterization of the relationship between exerted force and displacement) are carried out to evaluate the materials used for the shoe upper. This chapter shows a procedure based on artificial neural networks (ANNs) to reduce the number of flexibility tests that are needed for a comfortable shoe design. Using the elastic parameters of the material as inputs to the ANN, it is possible to find a neural model that provides a unique equation for the relationship between force and displacement instead of a different characteristic curve for each material. Achieved results show the suitability of the proposed approach.

Computer Aided Design and Characterization of Novel Acetylcholinesterase Enzyme Inhibitor for Potential Utilize in Alzheimer's Disease Therapy

2019 ◽  
Vol 13 (4) ◽  
pp. 804
Author(s):  
Hasanain Abdulhameed Odha ◽  
Mohammed Ridha A. Alhaideri ◽  
Radhwan M. Hussein ◽  
Hasanain Abdulameer Al-Rahmany ◽  
Sinan Forat Hussein ◽  
...  
Keyword(s):  
Alzheimer’S Disease ◽  
Alzheimer's Disease ◽  
Computer Aided Design ◽  
Enzyme Inhibitor ◽  
Disease Therapy ◽  
Computer Aided ◽  
Acetylcholinesterase Enzyme ◽  
Aided Design

Computer aided design and NMR characterization of an oligopeptide targeting the Ebola virus VP24 protein

2017 ◽  
Vol 41 (11) ◽  
pp. 4308-4315 ◽  
Author(s):  
Federico Dapiaggi ◽  
Stefano Pieraccini ◽  
Donatella Potenza ◽  
Francesca Vasile ◽  
Helena Macut ◽  
...  
Keyword(s):  
Computer Aided Design ◽  
Ebola Virus ◽  
Computational Studies ◽  
Nmr Characterization ◽  
Computer Aided ◽  
Aided Design

The nona-peptide RS, designed on the basis of computational studies, is able to interact with Ebola VP24 and potentially inhibit its interaction with KPNA.

Computer-aided design, synthesis and biological characterization of novel inhibitors for PKMYT1

2019 ◽  
Vol 161 ◽  
pp. 479-492 ◽  
Author(s):  
Abdulkarim Najjar ◽  
Charlott Platzer ◽  
Anton Luft ◽  
Chris Alexander Aßmann ◽  
Nehal H. Elghazawy ◽  
...  
Keyword(s):  
Computer Aided Design ◽  
Biological Characterization ◽  
Design Synthesis ◽  
Computer Aided ◽  
Aided Design

scholarly journals Bending Fracture of Different Zirconia-Based Bioceramics for Dental Applications: A Comparative Study

Materials ◽  
2021 ◽  
Vol 14 (22) ◽  
pp. 6887
Author(s):  
Peter Fischer ◽  
Horia Mihail Barbu ◽  
Caroline Adela Ingrid Fischer ◽  
Mihaela Pantea ◽  
Florin Baciu ◽  
...  
Keyword(s):  
Grain Size ◽  
Computer Aided Design ◽  
Sem Analysis ◽  
Structural Defects ◽  
Dental Prostheses ◽  
Computer Aided ◽  
Cad Cam ◽  
Fixed Dental Prostheses ◽  
Aided Design ◽  
Dental Applications

The fabrication of fixed dental prostheses using aesthetic materials has become routine in today’s dentistry. In the present study, three-unit full zirconia fixed prosthetic restorations obtained by computer-aided design/computer-aided manufacturing (CAD/CAM) technology were tested by bending trials. The prostheses were intended to replace the first mandibular left molar and were manufactured from four different types of zirconia bioceramics (KatanaTM Zirconia HTML and KatanaTM Zirconia STML/Kuraray Noritake Dental Inc.; NOVAZir® Fusion float® ml/NOVADENT/Dentaltechnik; and 3D PRO Zirconia/Bloomden Bioceramics). In total, sixteen samples were manufactured—four samples per zirconia material. Additionally, the morphology, grain size area distribution, and elemental composition were analyzed in parallelepiped samples made from the selected types of zirconia in three different areas, noted as the upper, middle, and lower areas. The scanning electron microscope (SEM) analysis highlighted that the grain size area varies with respect to the researched area and the type of material. Defects such as microcracks and pores were also noted to a smaller extent. In terms of grain size area, it was observed that most of the particles in all samples were under 0.5 μm2, while the chemical composition of the investigated materials did not vary significantly. The results obtained after performing the bending tests showed that a zirconia material with fewer structural defects and an increased percentage of grain size area under 0.5 µm2, ranging from ~44% in the upper area to ~74% in the lower area, exhibited enhanced mechanical behavior. Overall, the resulting values of all investigated parameters confirm that the tested materials are suitable for clinical use.

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