Simulation of Explosive Welding with ANFO Mixtures

The work described here arose from a study into explosive welding. As part of that study, the impact velocity of stainless steel and titanium plates to grazing detonation of ANFO/perlite, the velocity of detonation were measured. Computer simulation required a new model which copes with an equation of state of low explosives.     

Investigation of mixing performance in a semi-active T-micromixer actuated by magnetic nanoparticles: Characterization via Villermaux–Dushman reaction

A semi-active T-type micromixer is designed to intensify micromixing by actuating magnetic nanoparticles (MNPs). Five permanent magnets in a zig-zag arrangement are located next to the mixing channel of the micromixer to apply the magnetic field to the fluid flow. Micromixing performance is considered in terms of the segregation index (X_S) by the Villermaux/Dushman reaction test. The effects of magnetic flux intensity (B = 380–500 mT), the concentration of MNPs (φ = 0.002–0.01 [w/v]), and flow rate ratios on X_S and pressure drop are investigated. By increasing MNPs concentration from φ = 0.002–0.008 (w/v), X_S decreased and the rise in φ up to 0.008 (w/v) has not been significant on X_S. Maximum mixing efficiency (i.e., minimum X_S = 0.0088) is achieved for B = 500 mT and φ = 0.01 (w/v). By applying the magnetic field, the mixing performance increased due to the motion of MNPs, but its negative effect is an increase in the pressure drop along the micromixer reactor. Generally, with the formation of MNPs barriers inside the mixing channel, the main fluid flows through these layers and creates the sinusoidal flow paths compared to no magnetic field conditions, and thus, a superior mixing efficiency could be attained.     

Detection of Escherichia coli K12 in Water Using Slot Waveguide in Cascaded Ring Resonator

Silicon - Escherichia coli (E. coli) bacteria can cause serious fatal health problems in human, thus early and quick pathogen detection of these bacteria is a crucial issue in hospitals, food...     

Large-scale precipitation synthesis of α-alumina with poly aluminum chloride: Optimization of synthesis parameters

α-Alumina production has been industrialized since many years ago. Nevertheless, there are still challenges in the efficient synthesis of α-alumina with subtle specifications for high-tech applications, specifically on large scales. So, here, we investigated the large-scale synthesis of α-alumina by the precipitation method and with industrial grade poly aluminum chloride (PAC) as the aluminum precursor, for the first time. The synthesis procedure was optimized in terms of synthesis yield and facilitation of α-alumina formation by adjusting the concentration of the precursor (PAC) and precipitant (NaOH) solutions. The samples were characterized by conducting several analyses, including X-ray diffraction, X-ray fluorescence, field emission scanning electron microscopy, transmission electron microscopy, energy-dispersive X-ray spectroscopy, dynamic light scattering, and gas adsorption. The results indicated the significant effects of PAC and NaOH concentrations on the synthesis yield and facilitation of the α-alumina formation. According to the results and process considerations, working at higher levels of PAC (.75 g/ml) and NaOH (1.0 M) concentrations was found to be the optimum synthesis conditions. Moreover, the potential of the optimized sample as the abrasive material and the catalyst support was evaluated. The results confirmed the high potential of the optimized sample in these applications. This study therefore introduces a promising and cost-effective method for the large-scale synthesis of versatile α-alumina.     

Propagation of Terahertz Pulses in Photonic Crystal-Based Rib Silicon Waveguides

Silicon - Propagation of terahertz (THz) waves in silicon waveguides is of special interest for THz applications such as optical integrated circuits. In this paper, a photonic crystal-based rib...     

Studying the Role of Gelation Agents in Gelcasting Non-porous Si3N4 Bodies by Pressureless Sintering

Silicon - The monomer content in the gelcasting process affects the kinetics of cross-linking reactions which determines the quality of the gel network structure and the final properties of the...     

Fabrication and Properties of a Gel-Cast Dense Silicon Carbide Body

Silicon - In this research, the effect of different parameters on the behavior of suspension rheology, as well as the physical and mechanical properties of green and sintered SiC bodies, were...     

Feature fusion based on joint sparse representations and wavelets for multiview classification

Pattern Analysis and Applications - Feature-level-based fusion has attracted much interest. Generally, a dataset can be created in different views, features, or modalities. To improve the...