Materials Literature
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A globally convergent and fully coupled magnetomechanical model for 3D magnetostrictive systems is presented. In magnetostrictive actuators, magnetic field and stress inputs generate magnetic flux density and strain. We refer to models that follow this scheme as direct models (no relation to the direct magnetomechanic…
Highly cross-linked polyurethanes have a high elastic modulus and creep resistance, but they undergo a brittle fracture below the glass transition temperature. Unfortunately, a large number of glassy polyurethanes are prone to brittle fracture without undergoing large elastic deformations; in particular, brittle failu…
This study presents mechanical energy dissipation with a proof-of-concept prototype magnetostrictive (Fe-Ga alloy, galfenol) based shunt circuit using passive electrical components. Magneto strictive material can harvest electricity out of the structural vibrations based on the Villari effect using permanent magnet an…
Test blanket modules (TBMs) will be installed in the ITER with the aim to investigate the nuclear performance of different breeding blanket designs for fusion power reactors. Here, we present an overview of our ongoing work on three types of neutron flux monitors under development at Karlsruhe Institute of Technology…
Diffractive optical element (DOE) shows high diffraction efficiency and good dispersion performance, which makes the optical system becoming light-weight and more miniature. In this paper, the design, processing, testing, compensation of DOE are discussed, especially the analyzing of compensation technology which base…
This paper investigates the effect of strain rate on the behaviour of dry and \npartially \n- \nsaturated \nsand at very high stresses, seekin \ng to clarify the existence \nof a \nstrain \n- \nrat \ne dependence and how this is affected \nby changes in moisture \ncontent. \nDynamic \none \n- \ndim \nensional compress…
This paper describes the synthesis of gold nanorods, gold nanospheres and gold nanostars using modified versions of existing seed-mediated growth methods. The nanoparticles have been characterized on the basis of their morphology and optical properties using transmission electron microscopy (TEM) and spectrophotometry…
ZnO nanostructures, including ZnO nano quasi-spheres and nanoplates, were synthesized hydrothermally, from the reaction of zinc acetate, catalyzed by Preyssler type heteropolyacid (H14 [NaP5W30O110]), at 140°C in 48 and 72 hours, respectively. The ZnO nanostructures were characterized using transmission electron micro…
The different electronic states of trications and tetracations have been studied for oligomers made of n 3,4-ethylenedioxythiophene units, where n ranges from 2 to 30. Results have been compared with those obtained for neutral, monodications and dications of the same n-oligomers. For the longer oligomer (n ≥ 24) trica…
The synthesis of nanoparticle-cored dendrimers (NCDs) through surface functionalization of iron oxide nanoparticles (γ-Fe2O3) by combining the conventional silane coupling agent 3-(aminopropyl) triethoxysilane (APS) with dendritic moieties is studied and presented. Much emphasis has been put on the role played by each…
Polymeric composite laminates play a vital role in the fabrication of strong, lightweight materials. Composites also play a critical role in the aerospace and automotive industries. They are the very things that protect us from harsh environments. Due to widespread usage, it is important to understand how these materi…
(STAM). The articles in this special issue contain original and review papers on fundamentals and applications contributed by experts in the field. The topics cover various approaches to practical applications including catalysts, photonics, high specific strength materials, thermal storage materials and thermal recti…
A nanolens based on a metallic nanorod has been considered as a prospective candidate for transporting subwavelength information. Such a lens is tuned to a particular frequency by tailoring the length of the nanorod. In this paper, we have investigated the impact of filling ratio on the subwavelength imaging capabilit…
An aqueous ferric nitrate nonahydrate (Fe(NO3)3.9H2O) and magnesium oxide (MgO) were mixed and deposited on silicon nanowires (SiNWs), the carbon nanotubes (CNTs) formed by the concentration of Fe3O4/MgO catalysts with the mole ratio set at 0.15:9.85 and 600°C had diameter between 15.23 to 90nm with high-density distr…
The Fabry-Perot model is proposed to analyze the wavelength-selective transmission behaviors of the metal-dielectric-metal waveguide with a rectangular side-coupled cavity. The guided modes propagating in the waveguide and the cavity are extracted by the aperiodic Fourier modal method (a-FMM). The scattering coefficie…
Using convolution and subordination concepts, we define som e new subclasses of analytic functions and study their properties including inclusion relations and radius probl ems. Several applications related to conic domains and certain integral operators are also given. Results obtained in this paper may motivate furt…
The work presented here focuses on the numerical modeling of cylindrical structure eigenmodes with an arbitrary cross section using Gegenbauer polynomials. The new eigenvalue equation leads to considerable reduction in computation time compared to the previous formulation. The main idea of this new formulation involve…
A new coarsening model was established to describe the growth of skin droplets on a hollow‐fiber membrane prepared by liquid–liquid thermally induced phase separation. Forced air‐cooling was performed to trigger the phase separation. The heat and mass transfer processes of the skin layer are considered simultaneously.…
The paper presents a numerical implementation of the ZM model for shape memory alloys that fully accounts for non-proportional loading and its influence on martensite reorientation and phase transformation. Derivation of the time-discrete implicit integration algorithm is provided. The algorithm is used for finite ele…
Dielectric Elastomers (DEs) are deformable dielectrics, which are currently used as active materials in mechatronic transducers, such as actuators, sensors and generators. Nonetheless, at the present state of the art, the industrial exploitation of DE-based devices is still hampered by the irregular electro-mechanical…