99 research outputs found
Large Dzyaloshinskii-Moriya interaction and atomic layer thickness dependence in a ferromagnet-WS2 heterostructure
No full textWe thank Andre Thiaville and Frederic Piechon for fruit-ful discussions. The Swedish Research Council (VR; Grant No. 2017-03799) and Carl Tryggers Stiftelse for Vetenskaplig Forskning (Grant No. CTS 17:450) are gratefully acknowl-edged for support
Magneto-optical properties of CoFeB ultrathin films: Effect of Ta buffer and capping layer
No full textRole of Intrinsic and Extrinsic Factors Affecting Continuance Intentions of Digital Payment Services
No full textPart 5: Diffusion of Information Technology and Systems (Conference Theme)International audienceThis paper examines the continual usage intentions of digital payments. It investigates the effects of perceived risk, quality of service, and grievance redressal structure on the Digital Payment Service continuation through the integration of the Expectation-Confirmation Model (ECM) with some of the most researched technology adoption models. The survey was conducted at two different time line, pre and post demonetization in India. The results of the study were compared to the model (pre demonetization in India), suggest that there is a control effect of ease of usage in experience, gender, and age. The effect of hedonic motivation on the desire to use is moderated by age, gender, and experience to a higher degree among young people in the early phases of digital payments also the effect of grievance redressal as a moderator variable was significant
Developing Meso and Microholes by Spark-Erosion Based Drilling Processes: A Critical Review
No full textThe increased demand for miniature components has drawn the attention of researchers, engineers, and industry users to manufacture precision micro and mesoholes on foils, sheets, and plates made from a variety of engineering materials. These days, micro-drilling is extensively being adopted as a fundamental operation in all kinds of smart manufacturing industries to make different types of microholes, such as through holes, blind holes, and taper holes on micro-parts and components. Drilled holes with a diameter of less than 1 mm are referred to as microholes, while drilled holes whose diameter ranges between 1 and 10 mm are known as mesoholes. Meso and microholes are commonly referred to as fine-holes. Modern or advanced drilling processes are mostly used to drill microholes from a variety of materials. This paper presents an extensive review of the previous research conducted on the drilling of fine holes (meso and micro size) by spark- erosion-based processes along with highlighting work and tool electrode materials, specifications of drilled holes, types of microholes (through or blind holes), process parameters, performance measures, and key findings. The paper aims to facilitate researchers and scholars by highlighting the capabilities of spark erosion machining, drilling, and its variants to fabricate miniature holes. The paper ends with a conclusion and future research directions to encourage further work in this area
Effect of post-annealing on the magnetic properties of sputtered Mn56Al44 thin films
No full textMa(56)Al(44) (MnAl) thin films of constant thickness (similar to 30nm) were grown on naturally oxidized Si substrates using DC-magnetron sputtering. Effect of deposition parameters such as sputtering power, substrate temperature (T-s), and post-annealing temperature have been systematically invstigated. X-ray diffraction patterns revealed the presence of mixed phases, namely the tau- and beta-MnAl. The highest saturation magnetization (M.$) was found to be 65emu/cc using PPMSVSM in film grown at T-s =500 degrees C. The magnetic ordering was found to get significantly improved by performing post annealing of these as-grwon at 400 degrees C for 1 hr in the presence of out-of-plane magnetic field of similar to 15000e in vacuum. In particular, at room temperature (RT), the Ms got enhanced after magnetic annealing from 65mm/cc to 500 emu/cc in MnAl films grown at T-s=500 degrees C. This sample exhibited a magneto-resistance of similar to 1.5% at RT. The tuning of the structural and magnetic properties of MnAl binary alloy thin films as established here by varying the growth parameters is critical with regards to the prospective applications of MnAI, a metastable ferromagnetic system which possesses the highest perpendicular magnetic anisotropy at RT till date.</p
Polyethylene glycol degradation by UV irradiation
No full text1355-1358Degradation of polyethylene glycol has been
studied by UV irradiation. A drastic change in the morphology from spherulite
to rhythmic pattern has been observed under polarized light microscope when exposed
to UV light. Molecular weight of PEG, Rf value and melting point have
been recorded after UV exposure. On UV exposure there has also been a change in
UV, IR and powder X-ray diffraction pattern
Development of an EN8 Steel Stepped Rotor by a Novel Engraving Milling Technique
No full textThe rotor or impeller is a rotational and key part of a pump and compressor. This article presents the detailed development process of a rotor of small size constructed from an EN8 steel cylindrical blank using a novel technique based on a computer numerical control engraving milling machine (CNC-EMM) equipped with a 4 mm tungsten carbide end mill cutter. We fabricated a total of twenty-eight stepped rotors following the Box–Behnken Design (BBD) DoE technique at fourteen distinct combinations of CNC-EMM variable parameters, namely rotational speed, feed, and plunge feed. Average roughness ‘Ra’, an important surface quality indicator, has been considered and presented in this article, as a quality measure for the fabricated rotors. Feed and plunge feed have been identified as the most influencing variable parameters as per an analysis of variance (ANOVA) test. The lowest average roughness value obtained by this process for the rotor blade was 0.11 µm. A micrograph obtained from a field-emission scanning electron microscope (FE-SEM) showed a uniform and accurate tooth profile along with burr formation at corner edges. This study claims to establish engraving milling as a viable alternative to other manufacturing processes used for rotor blades. The findings of this study are useful to scholars, engineers, and researchers who are exploring new ways to fabricate mechanical parts and components
Fabrication of PbS quantum dots and their applications in solar cells based on ZnO nanorod arrays
No full textA Review on Fabrication of Cylindrical and Rotating Parts by Thermoelectric-Erosion Based Turning Processes
No full textNowadays, advanced turning processes are extensively being adopted to perform different types of turning operations such as straight turning, taper turning on Hastelloy, Nimonic, and Inconel, stainless steel, and tool steel to fabricate better quality cylindrical and rotating parts such as miniature-bars, miniature-pins, miniature-electrodes, and miniature-tools. This paper presents a review of the previous research conducted on the turning of miniature cylindrical bars using thermoelectric-erosion based turning processes namely thermoelectric-erosion turning (TET) and wire-assisted thermoelectric-erosion turning (WTET). It also highlights work and tool electrode materials, types of dielectrics, detailed specifications of turning, types of turning, process parameters, performance measures, advantages and limitations, and key findings. The paper ends with conclusions and future research directions. This paper aims to facilitate researchers and scholars by highlighting the potential and capabilities of TET and WTET processes and providing relevant information for ease of fabrication of miniature parts and components from a wide range of difficult-to-machine materials
Sustainable Manufacturing of Asymmetric Miniature-Sized Ratchet Wheels by Wire Electrical Discharge Machining
No full textIn this paper, the outcomes of an investigation conducted on the sustainable manufacturing of asymmetric rotary miniature-sized ratchet wheels of stainless steel (SS) 304 by a vertically traveling wire electrical discharge machining (WEDM) process are reported. The consumptions of energy and wire material are the process sustainability indicators considered in this work. Box-Behnken-based seventeen experiments were conducted by varying spark-on-time ‘Ton’, spark-off-time ‘Toff’, and wire rigidity ‘WT’. Desirability function analysis (DFA) based on multi-response optimization was performed to obtain an optimum setting of WEDM parameters to manufacture miniature-sized ratchet wheels with minimum energy and wire consumption. Sustainable manufacturing of ratchet wheels is performed at the optimum parameter combination of Ton-1.5 µs; Toff-40.5 µs; WT-1260 g, for the least values of energy consumption of 0.64 kWh and wire consumption of 20.11 g with no wire breakage and a significant reduction in total idle time. This ratchet wheel, manufactured at optimum parameters of WEDM, was also found to have a good finish (average surface roughness ‘Ra’-1.08 µm and maximum surface roughness ‘Rt’-6.81 µm) and defect-free tooth flank surfaces. Overall, it is concluded that WEDM has the potential to achieve sustainability in the manufacturing of miniature-sized ratchet wheels and other gears. The outcomes of this work will extensively facilitate engineers and researchers in selecting a suitable range of machining parameters for sustainable manufacturing of miniature-sized wheels and gears
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