scholarly journals Concentration effect of sodium carbonate and sodium aluminate as accelerator and H2O mixing against physical properties: Flow ability, setting time, and strength in low cement castable refractory product (Case study: PT. Indoporlen)

2017 ◽  
Author(s):  
Mei Krismahariyanto ◽  
Bungaran Saing ◽  
Hernowo Widodo
Keyword(s):  
Physical Properties ◽  
Sodium Carbonate ◽  
Setting Time ◽  
Sodium Aluminate ◽  
Refractory Product ◽  
Concentration Effect

scholarly journals Physico-Chemical Investigation of Endodontic Sealers Exposed to Simulated Intracanal Heat Application: Hydraulic Calcium Silicate-Based Sealers

Materials ◽  
2021 ◽  
Vol 14 (4) ◽  
pp. 728
Author(s):  
David Donnermeyer ◽  
Magdalena Ibing ◽  
Sebastian Bürklein ◽  
Iris Weber ◽  
Maximilian P. Reitze ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Thermal Treatment ◽  
Film Thickness ◽  
Physical Properties ◽  
Calcium Silicate ◽  
Setting Time ◽  
Chemical Properties ◽  
Chemical Changes ◽  
Time Flow ◽  
Heat Application

The aim of this study was to gain information about the effect of thermal treatment of calcium silicate-based sealers. BioRoot RCS (BR), Total Fill BC Sealer (TFBC), and Total Fill BC Sealer HiFlow (TFHF) were exposed to thermal treatment at 37 °C, 47 °C, 57 °C, 67 °C, 77 °C, 87 °C and 97 °C for 30 s. Heat treatment at 97 °C was performed for 60 and 180 s to simulate inappropriate application of warm obturation techniques. Thereafter, specimens were cooled to 37 °C and physical properties (setting time/flow/film thickness according to ISO 6876) were evaluated. Chemical properties (Fourier-transform infrared spectroscopy) were assessed after incubation of the specimens in an incubator at 37 °C and 100% humidity for 8 weeks. Statistical analysis of physical properties was performed using the Kruskal-Wallis-Test (P = 0.05). The setting time, flow, and film thickness of TFBC and TFHF were not relevantly influenced by thermal treatment. Setting time of BR decreased slightly when temperature of heat application increased from 37 °C to 77 °C (P < 0.05). Further heat treatment of BR above 77 °C led to an immediate setting. FT-IR spectroscopy did not reveal any chemical changes for either sealers. Thermal treatment did not lead to any substantial chemical changes at all temperature levels, while physical properties of BR were compromised by heating. TFBC and TFHF can be considered suitable for warm obturation techniques.

A Case Study on the Structure and Physical Properties of Thermoplastics

2014 ◽  
pp. 43-58
Author(s):  
Maria Rajkiewicz ◽  
Marcin Ślączka ◽  
Jakub Czakaj
Keyword(s):  
Physical Properties

scholarly journals Co-creating real-world research skills

2020 ◽  
Vol 4 (1) ◽  
pp. 120-127
Author(s):  
Julie Prescott ◽  
Duncan Cross ◽  
Pippa Iliff
Keyword(s):  
Higher Education ◽  
Real World ◽  
Teaching And Learning ◽  
Setting Time ◽  
Research Project ◽  
Research Skills ◽  
Open Environment ◽  
Support Time ◽  
Shared Ownership

This case study considers a students-as-partners’ research project that aimed to develop technologically-driven tools to enhance teaching and learning in higher education. It focuses on how the project enabled student participants to gain real world research skills and experience. We present reflections from both a student and a staff perspective and propose START (Support, Time, Adapt, Risks, Trust) as an approach to engage students to gain real-world research skills. Support refers to providing support for skills gaps and learning in an applied setting. Time refers to providing time to settle into the project and develop confidence, including realistic timeframes and deadlines. Adapt refers to giving students the space to develop not only the required skills but also the tools to develop their own abilities and confidence through a supportive, flexible and open environment. Risks refers to taking risks for example in terms of roles, responsibilities and leadership. Trust refers to providing guidance and encouragement that will allow students to achieve on their own and take shared ownership.

Gravity signature and physical properties of copper deposit in the Curaçá Valley, northern Bahia/Brazil - case study

2018 ◽  
Vol 66 (9) ◽  
pp. 1784-1795
Author(s):  
Marcos Vasconcelos ◽  
Robson Santos da Purificação ◽  
Daniel Conceição ◽  
Florivaldo Sena
Keyword(s):  
Physical Properties ◽  
Copper Deposit
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