Results 1 - 10 of 1661
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[en] CFD-DEM approach is applied to investigate circulation motion of particles in a mono-disperse system under both dry and wetting conditions. Good agreement between simulation results and measurement data is observed, in terms of cycle time and residence time in dry condition. The deposition of droplets on the particle surface is modeled by a Monte Carlo approach. The influence of cohesion forces on the macroscopic particle circulation is discussed. In addition, information about coating coverage, the layer thickness and particle size distribution can be predicted by this integrating approach. (Author)
[en] The discovery of electromagnetic induction in the early part of the 19th century is one of the greatest scientific achievements of all time, and it has had tremendous technological consequences. The credit for this discovery rightfully goes to the great English experimental physicist Michael Faraday. However, the American physicist Joseph Henry made some observations comparable to Faraday’s at nearly the same time, and for that reason, Faraday and Henry are often considered to be co-discoverers of some aspects of electromagnetic induction. We examine Henry’s early research on electromagnetism, starting from his efforts to improve the electromagnet, which led directly to his investigations of induction. We describe his earliest experiments on both mutual and self-induction, and pay particular attention to the relationship of Henry’s research to that of Faraday. The approach is one in which the experiments are described and then analysed using modern theory and terminology. (paper)
[en] In this paper, CoxNi(1−x)(OH)2 with various molar ratios of Ni/Co is synthesized through chemical treatment. Effects of Ni/Co molar ratios on microstructure and property of CoxNi(1−x)(OH)2 are explored. It is found that electrochemical property of the Co–Ni hydroxides could be optimized for a Ni/Co molar ratio of 1. The obtained Co0.5Ni0.5(OH)2 exhibits the most hollow out structure and preferable electrochemical performance as electrode material in hybrid supercapacitor. The interconnected and porous architecture built by thin nanosheets of Co0.5Ni0.5(OH)2 facilitates ion diffusion and electron transportation. The experiment results further show that the property decay during charging/discharging may be caused by the collapse of structure.
[en] The primary decomposition product (TKX-50-M) of dihydroxylammonium 5,5′-bistetrazole-1,1′-diolate (TKX-50) was obtained under adiabatic condition by using accelerating rate calorimeter (ARC). Meanwhile, diammonium 5,5′-bistetrazole-1,1′-diolate (ABTOX) was confirmed as the main component of TKX-50-M. Specific heat capacity of TKX-50-M and ABTOX was studied from 0 to 45 °C. In addition, the thermal decomposition of TKX-50-M and ABTOX was studied under adiabatic condition. The experiment results revealed that TKX-50-M were more thermal sensitive than ABTOX. Furthermore, ABTOX exhibited much violent than that of TKX-50-M during decomposition.
[en] In this work, novel Ag3PO4/PbBiO2Br composites have been successfully prepared by one-step chemical precipitation method. The photocatalytic activity of as-prepared photocatalyst was evaluated by decomposing methyl orange (MO) dye under visible light irradiation. The results showed that the Ag3PO4/PbBiO2Br composites exhibited excellent degradation efficiency for MO compared to pure Ag3PO4 and PbBiO2Br. The enhanced photocatalytic activity of the Ag3PO4/PbBiO2Br composites can be ascribed to the effective separation of photo-generated electron-hole pairs. Moreover, based on these experiment results, a reasonable mechanism was also proposed to explain the photocatalytic activity of Ag3PO4/PbBiO2Br composites. (paper)
[en] Bacterial growth presents many beautiful phenomena that pose new theoretical challenges to statistical physicists, and are also amenable to laboratory experimentation. This review provides some of the essential biological background, discusses recent applications of statistical physics in this field, and highlights the potential for future research. (review)
[en] In this paper, conceptual design of a tailing edge morphing mechanism developed based on a new kind of artificial muscle embedded in skin, named Driving Skin, is proposed. To demonstrate the feasibility of this conceptual design, an experiment using ordinary fishing lines to simulate the function of artificial muscles was designed and carried out. Some measures were designed to ensure measurement accuracy. The experiment result shows that the contraction ratio and force required by the morphing mechanism can be satisfied by the new artificial muscles, and a relationship between contraction ratios and morphing angles can be found. To demonstrate the practical application feasibility of this conceptual design, a wing section using ordinary ropes to simulate the function of the Driving Skin mechanism was designed and fabricated. The demonstration wing section, extremely light in weight and capable of changing thickness, performs well, with a morphing angle achieved. The trailing edge morphing mechanism is efficient in re-contouring the wing profile. (paper)