نتایج جستجو برای: na2o

تعداد نتایج: 1016  

Journal: :Dental materials : official publication of the Academy of Dental Materials 2014
Tobias T Tauböck Matthias Zehnder Thomas Schweizer Wendelin J Stark Thomas Attin Dirk Mohn

OBJECTIVES To investigate chemo-mechanical effects of incorporating alkaline bioactive glass nanoparticles into a light-curable dental resin matrix. METHODS An unfilled Bis-GMA/TEGDMA material was infiltrated with up to 20 wt% of ultrafine SiO2-Na2O-CaO-P2O5-Bi2O3 particles. The unfilled and filled resins were investigated regarding their viscosity before setting and compared to commercially ...

Journal: :The Journal of the Japanese Association of Mineralogists, Petrologists and Economic Geologists 1972

2014
Syed Rahman K. Siva kumar

Quaternary tungstate glasses containing K2O, Na2O and B2O3 have been prepared by melt quench technique and studied by IR and Raman spectroscopy. Raman and infrared spectroscopy have been employed to investigate the (30−x)Na2O–xK2O–10WO3–60B2O 3 glasses in order to obtain information about the competitive role of WO3 and B2O3 in the formation of glass network. IR spectral study reveals the exist...

Journal: : 2022

Dispersif zeminler, dolgu barajların çekirdek yapısında kullanıldığında erozyon hassasiyetlerinin çok yüksek olması nedeniyle içsel erozyona neden olarak bu tür göçmesine olmaktadırlar. Bu zeminlerin tasarım aşamasında belirlenerek inşaatında kullanılmaması gerekmektedir. zeminler; fiziksel (Dağılma deneyi, çifte hidrometre deneyi ve iğne deliği deneyi) kimyasal (Boşluk sıvısının içeriği) deney...

Journal: :Metallurgical and Materials Transactions E 2015

Journal: :Journal of the Ceramic Society of Japan 2004

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