Materials Literature
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Abstract The polyaniline (PANI) was synthesized using different dopant acids (iminodiacetic, methanesulfonic, phosphoric, and boron trifuoride) using oxidative polymerization method. These obtained new polymers were characterized by using spectrophotometric methods such as FTIR, UV–vis. The calculated value of the opt…
We present a microscopic study of the nuclear magnetic relaxation rate 1/ T 1 based on the five-orbital model for iron-based superconductors. We mainly discuss the effect of the ‘inelastic’ quasi-particle damping rate γ due to many-body interaction on the size of the coherence peak, for both s ++ and s ± -wave superco…
Abstract The specific heats ( C sp ) of neat and glycerol‐plasticized poly(vinyl alcohol) (PVOH) were studied by differential scanning calorimetry at 330–530 K. Glycerol‐plasticized poly(vinyl alcohol) was prepared by a melt‐blending method. The outcomes were modeled into mathematical functions. Incorporation of glyce…
We investigate the interplay of onsite Coulomb repulsion and various mechanisms breaking the fourfold lattice symmetry in a three-band model for the iron planes of iron-based superconductors. Using cluster-perturbation theory allows us to locally break the symmetry between the x- and y-directions without imposing long…
We present results of Brillouin light scattering studies of lysozyme and guanidine hydrochloride solutions in the temperature range 290–350 K. The Brillouin spectra of 6 M guanidine hydrochloride have been found to contain an additional component in Rayleigh scattering that manifests itself as a broad quasi‐elastic sc…
This paper presents experiments showing that the inversion of the sense of the applied stress on a specimen deformed in tension (respectively compression) results in the removal of mechanical instabilities such as the yield point and the Lüders band in a ferritic steel or serrations in an Al–Mg alloy. We show that thi…
Current article covers basics of powder compaction by electromagnetic impulse field and research results of sintered Fe powder part deformation process. This work is a joint research carried out by Riga Technical University (Latvia) and the Westsächsische Hochschule Zwickau (Germany).
Direct conversion of methane to ethylene, acetylene, and synthesis gas at ambient pressure and temperature in a parallel plate discharge reactor was investigated. The experiments were carried out using a quartz reactor of outer diameter of 9 millimeter and a driving force of ac current of 50 Hz. The input power to the…
International audience
Two flexidentate Schiff-base ligands condensed from salicylaldehyde or 5-chlorosalicylaldehyde with N-(3-aminopropyl)morpholine were prepared in situ and reacted with Zn(II) and Cu(II) salts. Upon complexation, the Schiff bases underwent deprotonation at hydroxyl to act as mono-anionic ligands. When a ligand : metal r…
Selektives Wachstum: NaYF4 bildet mit NaCl keine Kern-Schale-Strukturen, sondern wächst an den acht Ecken der NaCl-Nanowürfel, was zu einer Acht-in-eins-Käfigstruktur führt. Nach Dichtfunktionalrechnungen wird die Flächenselektivität durch die Grenzflächenenergie bestimmt, die sich wiederum aus dem Anionenzwang und de…
The electronic specific heat of monolayer graphene in response to a magnetic field is studied within the Peierls tight-binding model. The low-temperature thermal properties are dominated by the two lowest Landau levels, which are induced by the Zeeman effect. The temperature and the magnetic field compete with each ot…
journal article
This article presents fundamental design considerations of the thermoelectric harvester to be used in applications for machine condition monitoring or condition-based maintenance. The power to be harvested is the thermal power loss of the bearing. The aim of the harvester is to maintain the energy neutral operation. B…
This work presents a microstrip coupler based on an hybrid right-/left-handed (RH/LH) line whose coupling ratio is electronically controlled. After some considerations on the LH line theory, the asymmetric RH/LH coupler is presented focusing on the parameters yielding the coupling ratio and the frequency range. The de…
Rapid solidification of Mg(90)Ca(10) from its liquid state is studied by means of an ab initio molecular dynamics technique, and its local structure is investigated by various analyzing methods. The liquid and amorphous states are found to have slightly different short range order even though the perfect and defective…
Abstract The purpose of the work was to estimate an influence of gas‐assisted injection conditions (the temperature of plastic material, switch time‐delay time, gas injection time) of shape, position and dimension of gas channel, and structure of injection molded parts. The change in the value of the dynamic Young mod…
The linear and nonlinear optical properties (L&NLO) of a monolayer of (4-( N -methyl- N -(carboxypropyl)amino)-phenyl-4′-( N, N -dibutylamino)phenylsquaraine (SBA) were computed by a combination of molecular dynamics simulations, molecular quantum-mechanical, and discrete local-field model calculations to compute the…
Material constitutive models are important to predict deformation behaviour of materials. To identify parameters of constitutive models for high-strain-rate forming, appropriate methods are needed to investigate the dynamic behaviour of materials. Electromagnetic forming is a high-velocity and high-strain-rate forming…
The Nagaon Paper Mill(NPM) discharges their heavily loaded waste effluents @2100 m3/h into the natural wetland system called Elenga Beel located in Morigaon district of Assam(India).Due to higher chemical diversity of Paper Mill Effluents (PME) it impairs with the water quality as well as endangers aquatic life . The…