Synthesis of thiophenophanes with ethyne and ethene spacers
Synthesis of thiophenophanes with ethyne and ethene spacers has been achieved by
Materials Literature
文献浏览
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。
Stability of the steady state for multi-dimensional thermoelastic systems ofshape memory alloys
This paper studies a dynamical stability of the steady state for some thermoelastic and thermoviscoelastic systems in multi-dimensional space domain.More general nonlinear term can be taken here than the one in [6] which studiedthe stability for the one-dimensional system called the Falk model system.We also give appl…
Determination of kinetic effects on particle size and concentration: instruction for scale up
Increasing the synthesis scale is one of the most important issues in nanocrystal synthesis. The main difference between small and large reactor is their thermal transfer rate which is reported to have great effects on particle nucleation and growth. In this paper, CdSe Quantum dots synthesis as was used as a model to…
Preparation of composite PMMA microbeads hybridized with fluorescent YVO4:Bi3+,Eu3+nanoparticles
Poly(methyl methacrylate) (PMMA) microbeads are hybridized with fluorescent YVO 4 :Bi 3+ ,Eu 3+ nanoparticles using the layer-by-layer adsorption technique. The composite beads A are prepared by adsorbing negatively-charged YVO 4 :Bi 3+ ,Eu 3+ nanoparticles onto positively-charged PMMA beads modified with poly(allylam…
Pseudospin-dependent scattering in carbon nanotubes
The breaking of symmetry is the ground on which many physical phenomena are explained. This is important in particular for bipartite lattice structure as graphene and carbon nanotubes, where particle-hole and pseudo-spin are relevant symmetries. Here we investigate the role played by the defect-induced breaking of the…
Thinning and polishing of cross-section of depth-graded WSi2/Si multilayer for linear zone plate application
A linear zone plate named multilayer laue lens (MLL) is fabricated using a depth-graded multilayer structure.The lens shows considerable potential in focusing an X-ray beam into a nanometer scale with high efficiency.In this letter, a depth-graded multilayer consisting of 324 alternating WSi2 and Si layers with a tota…
Hydrogen dynamics in Ce2Fe17H5: inelastic and quasielastic neutron scattering studies
The vibrational spectrum of hydrogen and the parameters of H jump motion in the rhombohedral Th(2)Zn(17)-type compound Ce(2)Fe(17)H(5) have been studied by means of inelastic and quasielastic neutron scattering. It is found that hydrogen atoms occupying interstitial Ce(2)Fe(2) sites participate in the fast localized j…
Note: Single-ultraviolet-photon dissociation dynamics of ${\rm CS}_{\rm 2}^ + (\tilde X{}^2\Pi _g)$ CS 2+(X2Πg) in 227–243 nm revealed by time-sliced velocity map imaging
The single-UV-photon (227–243 nm) dissociation of ${\rm CS}_2^ + (\tilde X{}^2\Pi _{g,3/2,1/2})$ CS 2+(X̃2Πg,3/2,1/2) into the S+(4S)CS(X1)Σ+ channel was investigated by means of time-sliced velocity map imaging technique. In the high-energy region of the $\tilde B{}^2\Sigma _u^ +$B̃2Σu+ state, a rather subtle photodi…
Cryogenic tensile and fracture properties of carbon nanofiber/poly-dicyclopentadiene composites fabricated by ultrasonic method
Cryogenic tensile and fracture properties of carbon nanofiber (CNF)/poly-dicyclopentadiene (poly-DCPD) composites have been investigated experimentally. Flat tensile specimens and single-edge notched tensile (SENT) specimens of CNF/poly-DCPD composites with 0.25, 0.5, and 1.0 vol% CNFs were fabricated by an ultrasonic…
Fatigue Behaviour of Notched Ti-6Al-4V in Inert Environment
This work focuses on the fatigue behaviour of notched Ti-6Al-4V titanium alloy in inert environment. V-notched flat samples were cycled under axial fatigue (R = 0.1) under inert conditions by immersion in paraffin oil. A step-loading technique was used to determine the fatigue limit at the complete fracture for a cons…
Lifetime Determination of the Raceway of a Large Three-Row Roller Slewing Bearing
This paper deals with calculation procedure for lifetime determination of a large three-row roller slewing bearing. First, the contact force distribution between the rollers and the bearing raceway is determined both analytically and numerically. Then, the position and the magnitude of the maximum contact force are id…
Acoustic emission based flexural characteristics of glass fiber reinforced composites embedded with ZnO nanowhiskers
In recent years, Zinc oxide (ZnO) nanowhiskers, with good functional and mechanical properties, have been used for the preparation of structural and functional composites. However, the reinforcement mechanism of ZnO nanowhiskers in the composites is not fully understood. In this study, three-point bend tests have been…
Investigation of Structural Properties of Hetero-Module Composite in the B4C-BN-TiC-SiC-C System
Experiments have been carried out to develop multifunctional composites with improved properties and structure for using in air turbines, ballistic armor, cutting tools and atomic reactors. For optimization of sintering process, microstructure improvement and viscosity increase we used MgO,Y 2 O 3 additives. Carbon fi…
Loading Frequency Effects on the Fatigue Crack Growth Rate and Fracture Surface Morphology of Low Carbon Steel in Case of Long-Term Use in Hydrogen Gas
Loading frequency effects on FCGR and fracture surface morphology were investigated on pre-strained low carbon steel in high FCGR range. Loading frequency effects showed the different trend between internal hydrogen and environmental hydrogen. The effects of combined condition hydrogen revealed similar tendency of env…
NMR study of size effects in relaxor PMN nanoparticles
Abstract 93Nb ${1 \over 2}$ → −${1 \over 2}$ NMR line shape and spin–lattice measurements show that microcrystalline PbMg1/3Nb2/3O3 (PMN) powder is dynamically disordered at room temperature, whereas nanocrystalline PMN powder is orientationally frozen out and long‐range ordered at room temperature. The dynamical diso…
Signatures of a hybridization gap in magnetic susceptibility of Ce1−xLaxOs4Sb12
The magnetic susceptibility of Ce(1-x)La(x)Os(4)Sb(12), with x ≈ 0.2, exhibits a pronounced maximum at T(m) = 80 K. This T(m) coincides roughly with the temperature below which a small gap, believed to be a hybridization gap, is observed in spectroscopic measurements in undoped CeOs(4)Sb(12). However, a similar anomal…
Fatigue Strength of Radical Nitrided Spheroidal Graphite Cast Iron
In order to investigate the effect of radical nitriding on fatigue strength of spheroidal graphite cast iron FCD400, rotating bending fatigue tests were carried out at room temperature. Fatigue strength was increased by nitriding. Fracture started from microshrinkages or abnormal graphites in the same manner as that o…
Performance of Different Metal-Foam Stuffed Whipple Shield against Hypervelocity Impact of Space Debris
Hypervelocity impacts on spacecraft in low earth orbit by meteoroids and space debris poses a threat to space missions, and the use of a shield can significantly decrease the probability of a catastrophic failure. Tests have identified that metallic foams have a good shielding performance against hypervelocity impact…
MIC Behavior of the Low Alloy Steel with Different Zn-Epoxy Coating in SRB Solution
The microbiological influenced corrosion (MIC) behavior of the low alloy steel with granular-Zn-epoxy and flaky-Zn-epoxy coating in the sulfate-reducing bacteria (SRB) solution was investigated with electrochemical impedance spectroscopy (EIS), X-rays diffraction (XRD), scanning electron microscope (SEM) etc. Results…
Crack-healing function of metal/Al2O3hybrid materials
Nano-Ni/Al 2 O 3 hybrid materials have the crack-healing function by thermal oxidation process such as 1200°C for 6 h in air. In this hybrid material system, crack was filled up by an oxidation product, NiAl 2 O 4 , via outward diffusion of cations along grain boundaries of Al 2 O 3 matrix. Ni/Al 2 O 3 with Y 2 O 3 do…