Characterization of bulk materials - Determination of a size-weighted fine fraction and crystalline silica content

2021 ◽  
Keyword(s):  
Fine Fraction ◽  
Silica Content ◽  
Crystalline Silica ◽  
Bulk Materials

Structural characterization and magnetic property determination of nanocrystalline Ba3Fe2WO9 and Sr3Fe2WO9 perovskites prepared by a modified aqueous sol–gel route

CrystEngComm ◽  
2019 ◽  
Vol 21 (2) ◽  
pp. 218-227 ◽  
Author(s):  
Jelena Bijelić ◽  
Anamarija Stanković ◽  
Brunislav Matasović ◽  
Berislav Marković ◽  
Mirjana Bijelić ◽  
...  
Keyword(s):  
Magnetic Property ◽  
Solid State ◽  
Structural Characterization ◽  
Sol Gel ◽  
Bulk Materials ◽  
Solid State Route

Characterization of nanocrystalline triple perovskites synthesized by a novel modified sol–gel route instead of bulk materials synthesized by a solid-state route.

A method for the determination of the complex permittivity by detuned ring resonators for bulk materials up to 110 GHz

2015 ◽  
Vol 7 (3-4) ◽  
pp. 251-260 ◽  
Author(s):  
Armin Talai ◽  
Frank Steinhäußer ◽  
Achim Bittner ◽  
Ulrich Schmid ◽  
Robert Weigel ◽  
...  
Keyword(s):  
Effective Permittivity ◽  
Accurate Determination ◽  
Ring Resonators ◽  
Dielectric Losses ◽  
Bulk Materials ◽  
Resonance Frequencies ◽  
Measurement Results ◽  
Microwave Materials

An accurate characterization of microwave materials is essential for reliable high-frequency circuit design. This paper presents a measurement setup, which enables a quick and accurate determination of the relative permittivity of dielectric bulk materials up to 110 GHz. A ring-resonator is manufactured on a well-characterized substrate, serving as reference resonator. The material under test (MUT) is placed on top of the ring, which increases the effective permittivity and therefore introduces a shift of the resonance frequency of the resonator. In case of moderate to large dielectric losses of the MUTs, the quality factor of the resonator decreases perceptibly, which provides conclusions about the dielectric losses. Electromagnetic field simulations with different heights and relative permittivities of the MUTs provide a look-up table for the measured resonance frequencies. The functionality of the proposed measurement setup is validated by measurement results of different MUTs.

Characterization of Impressed Current Technique to Model Corrosion of Reinforcement in Concrete

2020 ◽  
Vol 11 (1) ◽  
pp. 93-99
Author(s):  
Abu Zakir Morshed ◽  
Sheikh Shakib ◽  
Tanzim Jahin
Keyword(s):  
Immersion Time ◽  
Chloride Content ◽  
Engineering Science ◽  
Coastal Regions ◽  
Faraday’S Law ◽  
Current Technique ◽  
Corrosion Cell ◽  
Impressed Current

Corrosion of reinforcement is an important durability concern for the structures exposed to coastal regions. Since corrosion of reinforcement involves long periods of time, impressed current technique is usually used to accelerate the corrosion of reinforcement in laboratories. Characterization of impressed current technique was the main focus of this research,which involved determination of optimum chloride content and minimum immersion time of specimens for which the application of Faraday’s law could be efficient. To obtain optimum chloride content, the electrolytes in the corrosion cell were prepared similar to that of concrete pore solutions. Concrete prisms of 200 mm by 200 mm by 300 mm were used to determine the minimum immersion time for saturation. It was found that the optimum chloride content was 35 gm/L and the minimum immersion time for saturation was 140 hours. Accounting the results, a modified expression based on Faraday’s law was proposed to calculate weight loss due to corrosion. Journal of Engineering Science 11(1), 2020, 93-99

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