Materials Literature
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Amorphous nickel hydroxides added anion (PO43-) has been prepared by chemical precipitation method combined with rapid quench technique. The morphology of the prepared samples were characterized by scanning electron microscope (SEM), and energy dispersive spectroscopy (EDS). The effect of anion on the electrochemical…
Epoxy resin (EP) and polyurethane (PU) were used as polymer matrix, chopped basalt fiber (BF) as reinforcement and prepared BF/EP-PU composites. And studied how different content of chopped BF influenced on the properties of BF/EP-PU composite. The results of SEM photos showed that the connection of BF and polymer mat…
Abstract Während es schon verschiedene Formgedächtnis‐Polymere mit einem einmaligen Formänderungseffekt gibt, sind solche mit umkehrbaren Formänderungen neu. Die Idee dahinter ist, ein inneres Gerüst aus kristallinen Bereichen als Hochtemperaturform zu wählen, während die Kristallisation von Bereichen, welche in der H…
This paper present a numerical analysis for estimate of the sound pressure level of permanent-magnet synchronous machine. The main sound source is based on the vibrations of the stator core due to electromagnetic force. Using magnetic field model and acoustic model, the sound pressure level around the assembly of a de…
Electrically tuneable thin film bulk acoustic wave resonators have drawn much attention for their advantages of high Q factors, integrable feature and small sizes. Accurate controlling of the thickness of the Bragg reflectors directly affects the Q-factor of the resonators with solidly mounted structure. In this paper…
This work has demonstrated the electron charging and discharging effects of MoSi2nanocrystals embedded in the a-Si layer of a nonvolatile memory (NVM) structure. The MoSi2nanocrystals were formed by the thermal annealing of the Mo-Si layer. A very thin silicon dioxide layer of 5 nm was deposited as the tunnel dielectr…
A two‐port synchronous resonator was used for measurements of surface acoustic wave (SAW) parameters in the Y ‐plane of NdCa 4 O(BO 3 ) 3 crystal. For YX –5°, YX and YX + 5° orientations, the SAW phase velocity under free surface, electromechanical coupling coefficient, second‐order temperature coefficient of frequenc…
Um rápido passeio nos assuntos sobre ciência nuclear e aplicações é feito de uma perspectiva histórica na qual as principais ideias e personagens que revolucionaram o século XX aparecem no caminho. Físicos brasileiros são também encontrados nessa caminhada. São aqui abordados, ainda que brevemente, as investigações qu…
A method for building the constitutive relationship based on the J-C model and hardness is presented through considering the influence of hardness on the yield strength and the tensile strength. A constitutive relationship of hardened AISI 1045 is built by this method and the adiabatic shear critical cutting condition…
Surface tension profiles in vertical soap films are experimentally investigated. Measurements are performed introducing deformable elastic objets in the films. The shape adopted by those objects set in the film can be related to the surface tension value at a given vertical position by numerical solving of adapted ela…
Through the experiment of cutting 45 steel, the influence of boronizing on Ti (C,N)-based ceramic cutting performance in different cutting speeds were discussed. The test results indicated that: regardless of boriding, cutting speed has a great influence on the life of Ti (C,N)-based ceramic cutting tool. Within the l…
A radio frequency(R/F) switch connector is widely used in wireless devices such as mobile phone and navigator to check defects of the circuit board of product. The R/F switch connector shell plays a role in protecting the switch connector. Previously, this part was machined using a turning, which is time-consuming and…
Aluminum foams from A356 base alloy were produced by both the melt foaming process and gas injection foaming process. A comparison of microstructures between the two kinds of aluminum foams was carried out. The related causes were analyzed to form the difference in microstructure. Results indicate that aluminum foams…
Multiwalled poly(ethylene glycol) diacrylate (PEGDA) hydrogel tubes are assembled via in situ self-folding of a bilayered hydrogel patch with different expansion ratios and rigidity between the two layers, as described by Hyunjoon Kong and co-workers on page 5568. The resulting gel tubes exhibit unidirectional, sustai…
Silver nanoparticles were generated using laser ablation technique in emulsified isobutyl acrylate solution in which the nanoparticles are stabilized and embedded over the acrylic polymerized solution. Further, the colloidal solutions were characterized with atomic force microscope (AFM), scanning electron microscope…
Polypyrrole (PPy) nanoflake array was synthesised by a secondary template (fir wood and ZnO microtube array) method and confirmed by scanning electron microscopy. Cyclic voltammetry was used to characterise the resultant PPy nanoflake array, which was subsequently used as electrode for glucose oxidase (GO) immobilisat…
Thick graphene which was grown by Chemical Vapor Deposition(CVD) on Nickel substrate and had thickness range about 500nm ~ 1μm was transferred into Si wafer using Hot Pressing with Thermal Release Tape(TRT). After transferring thick graphene into Si wafer, Scotch tape peeling test and Raman spectrum analysis were cond…
The development of the accommodation processes in general-type triple junctions is studied during the deformation of tricrystals and a system of nanocrystals with various grain sizes. Molecular dynamics simulation of the deformation of a system of nanocrystals with a grain size of ∼100 nm results in a set of accommoda…
A new unsymmetrical photochromic diarylethene 1o, which is named 1-(2- methoxyphenyl)-2-[2-methyl-5-(1,3-dioxolane)-3-thienyl]perfluorocyclopentene, was synthesized. Its photochromic and simulated molecule structure were also investigated in detail. This diarylethene underwent reversible photochromism, changing betwee…
Abstract isolation and structures elucidation of dysoxylumasins A—F (I—IV)