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Technologies, Volume 3, Issue 1 (March 2015) – 4 articles , Pages 1-57

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3658 KiB  
Article
Comparison of Grain Structure, Electrical and Magnetic Properties of BaTiO3 and Ni0.5Zn0.5Fe2O4 Ceramics Sintered Using Microwave and Conventional Techniques
by Santiranjan Shannigrahi and Chee Kiang Ivan Tan
Technologies 2015, 3(1), 47-57; https://doi.org/10.3390/technologies3010047 - 17 Mar 2015
Cited by 2 | Viewed by 6285
Abstract
BaTiO3 (BT) and Ni0.5Zn0.5Fe2O4 (NZF) ceramic disc specimens were prepared using commercial grade powders sintering by conventional (CV) and microwave (MW) sintering techniques. In both the sintering techniques the set sintering temperatures were in the [...] Read more.
BaTiO3 (BT) and Ni0.5Zn0.5Fe2O4 (NZF) ceramic disc specimens were prepared using commercial grade powders sintering by conventional (CV) and microwave (MW) sintering techniques. In both the sintering techniques the set sintering temperatures were in the range of 850 °C to 1000 °C and time from 0.5 to 2 h. Structure, microstructure, dielectric, ferroelectric and magnetic properties have been compared for the as sintered BT and NZF ceramic specimens. Comparatively large grain size and higher density observed for the samples sintered at same temperature and shorter holding time using microwave. Magnetic properties of the NZF samples sintered using MW at a temperature of 950 °C show a higher saturation magnetization (Ms) value of 88 emu/g. Full article
(This article belongs to the Special Issue Microwave Energy Applications)
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4312 KiB  
Article
Application of Sonication and Microwave Irradiation to Boost Continuous Fabrication of the Copper(II) Oxide Sub-Micron Particles
by Grzegorz Dzido, Michał Drzazga, Piotr Markowski and Andrzej B. Jarzębski
Technologies 2015, 3(1), 37-46; https://doi.org/10.3390/technologies3010037 - 5 Mar 2015
Cited by 8 | Viewed by 7624
Abstract
Viability of the continuous-flow synthesis of rhomboidal copper(II) oxide (CuO) micro- and nanonoparticles was demonstrated. It has been shown that ultrasonic mixing of reactants, in the stage of Cu(OH)2 synthesis, followed by microwave irradiation of the resulting suspension, gives very fine particles [...] Read more.
Viability of the continuous-flow synthesis of rhomboidal copper(II) oxide (CuO) micro- and nanonoparticles was demonstrated. It has been shown that ultrasonic mixing of reactants, in the stage of Cu(OH)2 synthesis, followed by microwave irradiation of the resulting suspension, gives very fine particles of CuO at high yield and within minutes. Near optimal parameters for the synthesis of fine particles in the continuous reactor were determined. Full article
(This article belongs to the Special Issue Microwave Energy Applications)
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1596 KiB  
Article
Characterization of a Large, Low-Cost 3D Scanner
by Jeremy Straub, Benjamin Kading, Atif Mohammad and Scott Kerlin
Technologies 2015, 3(1), 19-36; https://doi.org/10.3390/technologies3010019 - 30 Jan 2015
Cited by 37 | Viewed by 13120
Abstract
Imagery-based 3D scanning can be performed by scanners with multiple form factors, ranging from small and inexpensive scanners requiring manual movement around a stationary object to large freestanding (nearly) instantaneous units. Small mobile units are problematic for use in scanning living creatures, which [...] Read more.
Imagery-based 3D scanning can be performed by scanners with multiple form factors, ranging from small and inexpensive scanners requiring manual movement around a stationary object to large freestanding (nearly) instantaneous units. Small mobile units are problematic for use in scanning living creatures, which may be unwilling or unable to (or for the very young and animals, unaware of the need to) hold a fixed position for an extended period of time. Alternately, very high cost scanners that can capture a complete scan within a few seconds are available, but they are cost prohibitive for some applications. This paper seeks to assess the performance of a large, low-cost 3D scanner, presented in prior work, which is able to concurrently capture imagery from all around an object. It provides the capabilities of the large, freestanding units at a price point akin to the smaller, mobile ones. This allows access to 3D scanning technology (particularly for applications requiring instantaneous imaging) at a lower cost. Problematically, prior analysis of the scanner’s performance was extremely limited. This paper characterizes the efficacy of the scanner for scanning both inanimate objects and humans. Given the importance of lighting to visible light scanning systems, the scanner’s performance under multiple lighting configurations is evaluated, characterizing its sensitivity to lighting design. Full article
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6367 KiB  
Review
Using Microwave Energy to Synthesize Light Weight/Energy Saving Magnesium Based Materials: A Review
by Wai Leong Eugene Wong and Manoj Gupta
Technologies 2015, 3(1), 1-18; https://doi.org/10.3390/technologies3010001 - 20 Jan 2015
Cited by 45 | Viewed by 9287
Abstract
Microwave energy can be used for the processing of a wide variety of materials. It is used most commonly for the heating of food and has been increasingly applied for processing of polymers; ceramics; metals; minerals and composites. The use of microwave energy [...] Read more.
Microwave energy can be used for the processing of a wide variety of materials. It is used most commonly for the heating of food and has been increasingly applied for processing of polymers; ceramics; metals; minerals and composites. The use of microwave energy allows rapid and volumetric heating where heat is generated from within the material instead of via radiative heat transfer from external heating elements. This paper aims to provide a review on the use of energy efficient and environment friendly microwave energy route to synthesize magnesium based materials reinforced with various types of metallic and ceramic reinforcements. Magnesium composites are extremely attractive for weight critical applications in automotive; aerospace; electronics and transportation sectors. The magnesium composites were prepared using blend—compact—microwave sintering—extrusion methodology. Microwave sintering allowed a significant reduction of 80% in both processing time and energy consumption over conventional sintering without any detrimental effect on the properties of the synthesized magnesium composites. Physical; microstructure and mechanical properties of microwave sintered magnesium composites will also be discussed and compared with magnesium composites processed by conventional liquid and solid processing techniques. Full article
(This article belongs to the Special Issue Microwave Energy Applications)
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