Materials Literature
按标题、摘要、年份、主题和来源检索公开元数据。结果保留作者、摘要、分类与原始来源链接。
The interaction of meso-tetra-(4N-oxyethylpyridyl)porphyrin (TOEPyP4) and its Zn(II)-, Cu(II)-, Mn(III)-derivatives with tRNA from E.Coli at low ionic strength (micro=0.02M) was studied using UV/Vis spectrophotometry and Circular Dichroism (CD) methods. An unusual Induced Circular Dichroism (ICD) spectra profile of th…
We report the thermal and catalytic decomposition of low density polyethylene (LDPE) as a recycling route of plastic solid waste. The reaction system consisted of a fixed-bed reactor at a 450 °C reaction temperature and a 40 min reaction time. Tungstophosphoric acid (H3PW12O40)-functionalized ordered mesoporous materi…
Complex [FeL 2 (NCS) 2 ]·H 2 O (L = 3,5-di(pyrimidin-2-yl)-4 H -1,2,4-triazol-4-amine) was prepared as the first example of complex compounds of transition metals with 3,5-di(pyrimidin-2-yl)-4 H -1,2,4-triazol-4-amines. The coordination core of the iron atom is a distorted octahedron FeN 6 . In the range 80–300 K the…
In this paper, 3-D finite element modeling and simulations are carried out to investigate the bending deformation of a single-walled carbon nanotube cantilever biosensor due to mass attached, and addition of a nano-scale particles to the beam tip resulting from the bioparticle detection. In addition, an algorithm for…
(1 − x)PbFe1/2Nb1/2O3−x PbTiO3 (PFN-xPT) ferroelectric ceramics with low dielectric loss and pronounced anomalies of dielectric and pyroelectric properties near the ferroelectric-ferroelectric phase transition was obtained by doping with lithium. The temperature dependence of the position of the morphotropic boundary…
International audience
Nanomagnetic particles have been already taken into account as drug carriers thank to the possibility to control their movement to a specific location where the treatment is required by means of high gradient magnetic fields (HGMF). In this work the layer-by-layer technique (LbL) and nanomagnetic particles were used t…
The electronic properties of a Ca bilayer deposited on Cu(111) have been investigated by high-resolution electron energy loss spectroscopy. For the as-deposited Ca bilayer, the surface plasmon was recorded at 3.3eV. Temperature induces a surface metal-insulator transition (evidenced by the shift of the surface plasmon…
In the last 40 years the Method of Moments has been a cornerstone in the field of computational electromagnetics for antennas and other components in the microwave frequency range. In this paper, the applicability, advantages and disadvantages of this method are discussed in view of applying it at much higher frequenc…
Abstract The 1‐(3‐methylazulen‐1‐yl)alkan‐1‐ones, when oxidized with excess 2,3‐dichloro‐5,6‐dicyano‐1,4‐benzoquinone (=4,5‐dichloro‐3,6‐dioxocyclohexa‐1,4‐diene‐1,2‐dicarbonitrile; DDQ) in aqueous acetone in the presence of 1‐(3‐demethylazulen‐1‐yl)alkan‐1‐ones, form the corresponding unsymmetrically substituted bis(…
We suggest a cost-efficient way to fabricate the silicon nanowires (SiNWs) for commercial solar cell applications. Vertically aligned SiNWs arrays were prepared on a four-inch silicon wafer using a simple room temperature approach, i.e., metal-assisted electroless etching. Further chemical etching using a 30 wt% aqueo…
The stress strain state of tight joints under the action of a flexural torque is simulated by the finite-element method. The stress intensity at the contact zone in determined in characteristic cross sections of the shaft and the joint. The conditions of possible joint opening are established.
In this paper we will provide an overview of methods and instruments developed and applied at the National Metrology Institute of Germany (Physikalisch Technische Bundesanstalt—PTB) for high-precision dimensional (linear and angular) measurements and discuss some challenges for future developments in this important ar…
Carbon nanotube (CNT) can be used in micro-channel cooler construction due to its excellent thermal conductivity. When fabricating CNTs directly onto the chip, the chip could be damaged because of the high temperature required for CNT growth (about 750°C). As a solution, a transfer technique is developed where the des…
The paper addresses the thermal stability of fruit-stone activated carbon impregnated with the Cu-Co-Fe oxide catalyst. The nature and concentration of the oxygen-containing surface groups are determined. The kinetic investigation of the process of oxidation of fruit-stone activated carbon reveals a high catalytic act…
A pulsed operating mode of a piezoelectric plate placed into a liquid is considered. The problem is solved for the application of exciting electric pulses with a duration that is a multiple of the duration of a sinusoid half-period at the natural frequency of a piezoelectric plate. For different degrees of plate dampi…
Recent novelties in the heuristic methods are outlined for the following five groups of the methods: (i) Geometrical optics, (ii) complex geometrical optics, (iii) quasi-optics, (iv) geometrical theory of diffraction by Keller, physical theory of diffraction and method of the edge wares by Ufimtsev, (v) caustic asympt…
It was found that the second-generation carbosilane dendrimers with statistically distributed terminal aliphatic and azobenzene fragments induce negative orientational nonlinearity in nematic liquid crystals (NLC) (the NLC director turns perpendicular to the light field, decreasing the refractive index of an extraordi…
Reactions of 1,3- alternate stereoisomers of tetrathiacalix[4]arene and 4- tert -butyltetrathiacalix[4]-arene, functionalized by hydrazide groups, with benzaldehyde and pyridin-2-carbaldehyde gave new tetrathiacalix[ 4]arene tetrahydrazone derivatives as promising receptors for transition and toxic heavy metal ions.
The results of experiments on electrical conductivity and magnetic properties of thin cobalt-doped zinc oxide films are reported. The results indicate the predominance of the hoping conduction mechanism at low temperatures and the band mechanism at high temperatures. An increase in the cobalt concentration from 1.5 to…