Results 111 to 120 of about 187,330 (304)

Translucency of monolithic and core zirconia after hydrothermal aging

Acta Biomaterialia Odontologica Scandinavica, 2015
Objective: To evaluate the hydrothermal aging effect on the translucency of partially stabilized tetragonal zirconia with yttria (Y-TZP) used as monolithic or fully milled zirconia and of core type. Methods: Twenty disc-shaped specimens (1 and 10 mm) for each type of monolithic and core Y-TZP materials were milled and sintered according to the ...
Fathy, Salma M., El-Fallal, Abeer A., El-Negoly, Salwa A., El Bedawy, Abu Baker   +3 more
openaire   +2 more sources

Metal stain on monolithic zirconia restoration: A case report

The Journal of Advanced Prosthodontics, 2017
In restorative treatment using fixed dental prostheses, dentists should select appropriate restoration material among various types of dental materials. The strength, marginal fit, esthetics, wear resistance, biocompatibility, and cost are important factors in the choice of restoration materials.
Min-Sang Cha, Sang-Woon Lee, Yoon-Hyuk Huh, Lee-Ra Cho, Chan-Jin Park   +4 more
openaire   +2 more sources

Operando Magic Angle Spinning Solid‐State NMR Spectroscopy of Methanol Photoreforming Over Titania‐Coated Silica Monoliths

Chemistry – A European Journal, EarlyView.
Photoreforming of methanol is followed in real time by solid‐state Magic Angle Spinning NMR. The transparent sapphire sample holder is irradiated by four LEDs at 11.5 kHz MAS. Efficient light penetration into the sample volume is ensured by silica monoliths with a network of macropores, coated with TiO2, and enhancing light penetration by a factor of ...
Fei Ding, Karl König, Johannes Böhmer, Florian M. Wisser, Erdmann Spiecker, Benjamin Apeleo Zubiri, Dorothea Wisser   +6 more
wiley   +1 more source

Superconductivity devices: Commercial use of space [PDF]

A YBCO thick film containing 20 percent Ag2O with a T(sub c) of 86.8 K and J(sub c) of 108 A/sq cm was obtained. The film was fabricated by a two-step firing process, i.e., firing the film at 1000 C for 10 minutes and annealing at 970 C for 30 minutes ...
Furman, Eugene, Haertling, Gene, Hsi, Chi-Shiung, Li, Guang   +3 more
core   +4 more sources

Plasma Activate Nitrogen for Efficient Ammonia Synthesis

Exploration, EarlyView.
This review systematically summarizes the classification and reaction mechanism of plasma, and discusses the synergy between different plasmas and catalytic methods along with energy consumptions in detail, in order to gain a deeper understanding of currently ammonia synthesis strategies.
Yamei Zhang, Jianfei Yu, Haixia Wu, Zhijun Zhao, Hongjin Xia, Qingyang Li, Yiran Wang, Dongyang Li, Qian Wang   +8 more
wiley   +1 more source

Comparing Digital Reduction Guides and Free‐Hand Techniques for Predoctoral Crown Preparation Accuracy

Journal of Dental Education, EarlyView.
ABSTRACT Purpose/Objectives Insufficient tooth reduction compromises crown longevity and aesthetics. This study aimed to determine whether digitally designed, 3D‐printed reduction guides improved crown preparation accuracy and efficiency for dental students compared to freehand preparation.
Xiaoyue Shi, Shuncong Xu, Chenxuan Wei
wiley   +1 more source

Micro-Drilling of ZTA and ATZ Ceramic Composit: Effect of Cutting Parameters on Surface Roughness [PDF]

, 2012
Ceramics are a class of materials widely used during last fifteen years for orthopaedic applications. It is well known that they are characterized by low wear rate, and friction coefficient.
Gautier, G., Previtali, B., Rebaioli, L., Settineri, Luca, Tebaldo, V.   +4 more
core  

DFT Modeling and Impedance Spectroscopy Analysis of a High Performance Zirconia‐Based Solar Cell

Nano Select, EarlyView.
p‐SnS/n‐CdS heterojunction solar cells with Al‐ZnO/i‐ZnO window layers simulated using SCAPS‐1D and impedance spectroscopy enabled tracking of solar cell parameters. The optimal performance (η = 22.76%, Voc = 0.77 V) was achieved with a 5 µm SnS absorber at Rs = 1Ω.cm−2 and Rsh = 10 kΩ.cm−2.
George G. Njema, Rkia Zari, Elmostafa Elmesbahi, Abderrahmane Elmelouky, Abdelkhalek El Rharib, Abdelaziz Amine, Joshua K. Kibet, Mimoun Zazoui   +7 more
wiley   +1 more source

Overview of zirconia with respect to gas turbine applications [PDF]

Phase relationships and the mechanical properties of zirconia are examined as well as the thermal conductivity, deformation, diffusion, and chemical reactivity of this refractory material.
Cawley, J. D.
core   +1 more source

Fabrication‐Driven Oxidation Pathways in Y/Hf‐Modified High‐Entropy Alloys: From Elemental Segregation to Oxide Homogeneity

Rare Metals, EarlyView.
ABSTRACT This study elucidates the oxidation mechanisms governing Y/Hf‐doped AlCoCrFeNiTi high‐entropy alloys (HEAs) and reveals the pivotal role of fabrication processes in dictating high‐temperature oxidation behavior. We demonstrate that casting and spark plasma sintering (SPS) promote Y/Hf segregation, resulting in heterogeneous oxide formation and
Huaqing Yi, Jiapeng Zheng, Jiawen Zhang, Yi Yang, Binbin He, Wenjun Lu   +5 more
wiley   +1 more source