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 microstructure of Al-Zn alloys, with the Zn atom fraction, x(Zn) less than or equal to 62%, has been studied in detail by XRD in dependence on the composition, temperature and previous thermal treatment. Precipitation phenomena in alloys, transferred to the supersaturated state by rapid quenching from the solid so…
During the oxidation of zircaloy fuel cladding, large stresses develop in the oxide layer, due to the volumetric expansion related to phase change. The present paper deals with intermediate temperatures, typically 300-450°C. (1) The first section of the paper shows that the local geometry of interface must be taken in…
For improved understnding of the transport of low-molecular substances' in moderately hydrophobic polymers, the temperature dependence of water vapor sorption and diffusion in poly-(3-hydroxybutyrate) (PHB) was studied for the first time. Equilibrium sorption and diffusion kinetics were determined by a quartz McBain's…
The surface properties of two block copolyurethanes based on 1,2-ethylene bis(4-phenyl isocyanate) (P2PDI), poly(tetramethylene ether glycol) (PTMG) or poly(propylene glycol) (PPG), and ethylene diamine, were investigated by attenuated total reflectance (ATR) infrared spectroscopy and X-ray photoelectron spectroscopy…
The compatibilization of mixtures of polyolefins or of polyolefins with polystyrene using either liquid polybutadiene (l-PB)/organic peroxide or styrene-butadiene-styrene (SBS) block copolymers was investigated. Tensile impact strength was chosen as a measure of compatibility. Binary blends LDPE/high-impact polystyren…
Abstract The linear character of transesterified deproteinized natural rubber (DPNR-TE) was confirmed by the analysis of terminal groups with NMR and viscometric analyses. The branch content of DPNR rubber from fresh latex was found to range from 0.3 to 1.3 and 0.7 to 3.2, based on tri- and tetra-functionalities, resp…
The enzyme catalase (H(2)O(2)-H(2)O(2) oxidoredutase; E.C. 11.1.6) was purified from haemolysate of human placenta and crystallized using the vapour-diffusion technique. Synchrotron-radiation diffraction data have been collected to 1.76 A resolution. The enzyme crystallized in the space group P2(1)2(1)2(1), with unit-…
International audience
Composites of BaFe 12 O 19 particles dispersed throughout a 3‐mol%‐yttria‐doped zirconia (3Y‐TZP) matrix have been prepared using the pressureless reactive sintering of 3Y‐TZP, BaCO 3 , and γ‐Fe 2 O 3 powders. The reaction behavior of the mixed powder was studied with an in situ , high‐temperature powder X‐ray diffrac…
Failure mechanisms in polymer composites were investigated with the method of ultra-small-angle X-ray scattering using synchrotron radiation and acoustic emission analysis simultaneously. The composites were prepared from polystyrene filled with glass beads with different coatings. The two-dimensional scattering patte…
The addition of oxygen in Ca0.5Sr0.5Ga2S4:Ce phosphor was found to nearly double the luminance and to blue shift the emission spectrum of the Ce+3 4f–5d transition. X-ray photoelectron spectroscopy (XPS) analysis was used to investigate the local chemistry of the Ce+3 luminescent center in the undoped and oxygen-doped…
Passivation of the zirconium surface and stability of anodic oxide film were investigated as a function of surface preparation. The mechanically polished surface appeared to be more reactive toward oxide thickening than the etched one, as revealed by impedance measurements. Oxide film formed on the etched electrode di…
We consider the effects of the application of electric and magnetic fields to a homogeneously aligned nematic liquid crystal which lies between parallel plates. The average alignment of the fluid molecules is known as the director and it is set parallel to the top and bottom bounding surfaces. At a critical field stre…
The low-temperature form of K3Sm(PO4)2 crystallizes in the monoclinic system [a = 7.4347(5) Å, b = 5.6270(5) Å, c = 9.4919(5) Å, β = 90.870(6)°, Z = 2, space group P21/m]. The structure has been determined using 1263 independent reflections (R = 0.045, Rw = 0.11) and is found to be of the glaserite type. The Raman and…
Abstract Large and well-formed crystals of barium chlorapatite [Ba5Cl(PO4)3] were grown for the first time from a sodium chloride flux. The solubility of Ba5Cl(PO4)3 in NaCl increased with increasing temperature, reaching about 1.9 mol% solubility at 1100 °C. The crystal growth of Ba5Cl(PO4)3 was conducted by heating…
In this paper the over-thirty-years history of space applications of shape memory alloys (SMA) is summarized. Our experience is illustrated by detailed examples, such as the first launch of TiNi to an Earth orbit in 1982, when thermomechanical pipe couplings on the orbital station Salyut-7 were tested for their hermet…
The disorder in ion motion in a LaF 3 superionic conductor with tysonite structure is determined from NMR spectra. The method is sensitive to dynamic effects with correlation times of 5×10 −3 < τ <10 −6 s. Within the 260–400-K interval, ion movement is observed only on one of the sublattices (F 1 ), and it exhibits a…
The numerical algorithm for cap generation [1] is further developed. the cap unfolding method proposed in ref. [2] is used. Some aspects of the cap unfolding onto the honeycomb lattice [3] are also considered. Topological invariants of the cap structures are used to eliminate the duplicate structures. the list of all…
The development of crazes in polycarbonate was investigated with the method of ultra-small-angle X-ray scattering (USAXS) of synchrotron radiation. Measurements at different temperatures and with different draw rates were carried out. The two-dimensional scattering patterns were analyzed by means of a fibrillar model…
We report on measurements of the transmitted depolarized light intensity and on small-angle neutron scattering (SANS) measurements on a compositionally asymmetric poly(ethylene propylene)-poly(dimethylsiloxane) diblock copolymer studied in the bulk. SANS measurements were made both on isotropic and on shear oriented s…