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。
We investigated the interaction between the vacancy and $\ensuremath{\Sigma}5$ (210)[001] symmetric tilt grain boundary during the sliding by taking copper as a model material. The geometry optimization was done by simulating an annealing process at elevated temperature. For interatomic interaction we used an empirica…
AIMS: Gluconacetobacter xylinum is well known for its ability to produce large amounts of cellulose, however, little is known about its cell physiology. Our goal was to study the respiratory metabolism and components of the respiratory system of this bacterium in static cultures. To reach our goal, a medium formulatio…
Flash memories have been the fastest growing among the different semiconductor memory families; their market has reached a size comparable to the DRAM one and it is expected to keep growing in the coming years. The fantastic success of flash memory is related to the key role they play as storing media for both code an…
Abstract Nanoparticle networks can be synthesized by the self‐assembly of arrays of metal colloid particles linked by spacer molecules of different sizes. The particles are linked through reactive aluminum sites in a metal–organic shell around the metal particles. Rigid spacer molecules with functional groups at each…
The thermal evolution of the rhombohedral order parameter of cold-rolled Ni 50.7 Ti 49.3 alloy was measured by x-ray diffraction. The slightly first-order paraelastic to improper ferroelastic B2↔R phase transition occurs on cooling at 305 K; on cooling below 240 K the R-phase and residual austenite transform to B19′-m…
Ti–25Ni–25Cu(at.%) alloy ribbons have been fabricated by melt spinning with a linear velocity of 51.0 m s −1 , and then their microstructures and shape memory characteristics were investigated by means of optical microscopy, transmission electron microscopy, x-ray diffraction, thermal cycling tests under constant load…
The nanocrystallites (≈3nm) of LiNbO3, evolved in the (100−x)LiBO2-xNb2O5 (5⩽x⩽20, in molar ratio) glass system exhibited intense second-harmonic signals in transmission mode when exposed to infrared (IR) light at λ=1064nm. The second-harmonic waves were found to undergo optical diffraction which was attributed to the…
In the ten years since the introduction of the stress control material developed by Raychem for high voltage power cable terminations, a significant amount of practical knowledge has been amassed relating to the performance of these types of terminations on a range of cable types and at widely differing operating volt…
The behavior of some narrow single-wall carbon nanotubes under uniaxial stress was studied. The first principles local density-functional calculations were carried out using helical repeat units and periodic boundary conditions for a single infinite chain. The mechanical response of the tube, the geometrical deformati…
Adsorptions of both oxygen atoms and oxygen molecules on 4 \AA{} single-wall carbon nanotubes, which have been fabricated using a templating method recently, are studied by the plane-wave pseudopotential method. Our calculations will provide some useful information on the stability of such ultrasmall tubes under ambie…
Ni–Mn–Ga alloy is a new actuator material due to the fact that its shape memory effect can be controlled by magnetic field in addition to the conventional controls by temperature and stress. However, the alloy shows relatively low martensitic transformation and Curie temperatures. In this paper, we report the results…
Liquid crystal (LC) photo-alignment using azo-dyes is reviewed. This alignment method is very different from previously reported ones, which are due to mechanisms such as photo-crosslinking, photo degradation, and photo-isomerization. We present the basic physical mechanisms of the photo-induced orientational order in…
In this letter, we report on a multiple-wavelength up-conversion laser in Tm/sup 3+/-doped ZrF/sub 4/--BaF/sub 2/--LaF/sub 3/--AlF/sub 3/--NaF glass fiber pumped by an 1120-nm fiber laser. Single-wavelength, two-wavelength, and three-wavelength up-conversion lasers can be obtained by adjusting the distance between the…
The critical heat fluxes (CHFs) and the heat transfer coefficients (HTCs) in subcooled flow boiling were applied to a thermal analysis of the flat-plate-type divertor of a helical-type fusion experimental device, which is a Large Helical Device (LHD) located in the National Institute for Fusion Science (NIFS), Japan.…
SUMMARY The outstanding properties of diamond and the reproducible deposition of polycrystalline diamond on large area substrates has made it an interesting base material for microsensors. Of special importance are sensor applications at high temperatures and in harsh environments. Microsensors based on polycrystallin…
Thin films of Ti–Ni–Pd and Ti–Ni–Pt shape memory alloys were produced by a DC magnetron sputtering process. Targets with the following compositions were studied: Ti 54 Ni 16 Pd 30 , Ti 54 Ni 6 Pd 40 , Ti 54 Ni 3 Pd 43 and Ti 54 Ni 26 Pt 20 . The films were deposited on SiO 2 / Si substrates at ambient temperature and…
New single crystal piezoelectrics were investigated as improved transducer materials. Single crystals take advantage of crystallographic engineering to produce high piezoelectric and electromechanical coupling coefficients. Single crystal lead magnesium niobate-lead titanate (PMN) was substituted for the piezoelectric…
The roles of His181, His184 and Tyr186 in PETN reductase have been examined by mutagenesis, spectroscopic and stopped-flow kinetics, and by determination of crystallographic structures for the Y186F PETN reductase and reduced wild-type enzyme-progesterone complex. Residues His181 and His184 are important in the bindin…
We experimentally demonstrate subwavelength imaging by a “flat cylindrical” lens using negative refraction. A two-dimensional photonic crystal whose dispersion at the second band provides group velocity opposite to the phase velocity for electromagnetic waves is employed to realize the flat lens, and the working frequ…
Porous Ni-rich NiTi SMAs have been successfully prepared from elemental Ni and Ti powders, using capsule-free hot isostatic pressing processing. The fabricated alloys have isotropic and uniform pore distributions of spherical pores ranging from 50 to 200 µm. The porosities of these NiTi alloys range from 30 to 40% by…