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。
Schottky diodes based on Al/polyaniline (PANI), electrodeposited by cyclic voltammetry (CV) with two different upper oxidation potentials, 0.8 and 1.1 V, respectively, were fabricated. Auger electron spectroscopy (AES) confirms the presence of hydrolysis products of PANI, benzoquinone (BQ)/hydroquinone (HQ) for PANI f…
Unusual polydispersive dielectric response of undiluted Cd2Nb2O7 pyrochlore between 100 Hz to 6 MHz and 77 to 300 K is reported. Below TC ≈ 198 K, the relaxation typical of (i) a normal ferroelectric (FE), (ii) a relaxor FE with glassy behaviour, and (iii) a dipolar glass develop in the system. Based on a weak bonding…
Non-destructive techniques for the measurement of residual stresses provide a potential means of qualifying overheated railway wheels, thereby reducing the risk of wheel failures. An ultrasonic method, based on the acousto-elastic effect, is now accepted by the European railway industry for qualification of wheels at…
AIM: To study the synergistic effects of calmodulin (CaM) antagonist O-4-ethoxyl-butyl-berbamine (EBB) and pegylated liposomal doxorubicin (PLD) on hepatoma-22 (H(22)) in vivo. METHODS: Hepatoma model was established in 50 Balb/c mice by inoculating H(22) cells (2.5 x 10(6)) subcutaneously into the right backs of the…
In this work we use the Q-tensor order parameter to express the elastic free energy of a nematic liquid crystal. This correctly preserves the +n/−n symmetry and thus allows the modelling of defects. Using this, we calculate director profiles for cells containing surface relief gratings. Director profiles are presented…
The conductivity of three thulium (Tm) salts has been studied in dimethylsulfoxide (DMSO) at 298 K. has strong electrolyte properties in DMSO. Cyclic voltammetry has been used to investigate the electrochemical behavior of the ion in 0.01 mol L −1 -0.1 mol L −1 -DMSO system on the Pt electrode at 299 K. The experiment…
The usual algorithm of the structure factor calculation, which is widely used for amorphous metals and amorphous semiconductors, cannot be applied to a number of amorphous metal oxides. Instead, we have developed a new algorithm based on the middle line method. It uses analytical properties of the structure factor and…
A theory of 90° domain walls in tetragonal ferroelectrics is proposed. It is argued that the depolarizing field discerns the stable head-to-tail wall from the unstable head-to-head wall energetically. The relation between the free energy function and the effect of the depolarizing field is discussed.
Change in cohesive energies in a non-stoichiometric Ni9Mn3Ga4 alloy was calculated as a function of tetragonality, c/a, and compared with that in a stoichiometric alloy. A dip around c/a ≅ 0.97, which is seen in a stoichiometric alloy, disappears in the non-stoichiometric alloy, and a dip around c/a ≅ 1.23 become deep…
Hyper-Raman scattering experiment has been performed in SrTi(18Ox 16O1-x)3 single crystal with exchange rate x = 0.87. A polar F1u Slater mode is detected in the cubic phase. This mode becomes an Eu mode in the tetragonal phase and softens toward the phase transition temperature Tc = 26 ± 3 K. Electric field induced l…
For the first time, to the best of our knowledge, a realistic approach for deriving an estimate by superior values of the surface energy of complex metallic alloys based on aluminium is proposed. It turns out that the surface energy of quasicrystals lies in the range 0.5–0.8 J/m 2 , in contrast to pure aluminium (1.15…
Interaction of liquid crystals with nanostructured surfaces is studied experimentally. Whereas photolithographic or AFM methods were used in the past for surface structuring, we use besides photolithography essentially replication methods for the creation of well-controlled nano-topologies. We established a laboratory…
A recently formulated electrical model of photoinduced volume expansion caused by the Coulomb interaction between photogenerated carriers in chalcogenide glasses is examined quantitatively. It is shown that, depending upon photoexcitation conditions, the model predicts either expansion or contraction. However, the cal…
For the purpose of following electricity demand change and improving the efficiency of generation for fuel cells, a new system, which is called metal hydride intermediate buffer method, is developing. The system uses the selective reacting function of hydrogen on metal hydride materials. It is said that metal hydride…
To find out the degradation behavior of polymer in the real space, space exposure experiments utilizing the International Space Station (ISS) were scheduled. PEEK sheets under tensile stresses were exposed to the environment around the ISS orbit, and were irradiated by atomic oxygen (AO), ultraviolet ray, and electron…
Ferritic spheroidal graphite cast irons generally exhibit intergranular fracturing even if the specimens are strengthened by silicon in solid solution when tested under wet conditions. The maximum area fraction of intergranular fracture is closely related to the microstructural feature and ambient aqueous environment…
The American Mineralogist Crystal Structure Database is a compilation of every crystal structure potentially of mineralogic or geologic interest. The database, seen as an outreach service, is funded and maintained by NSF, the Mineralogical Society of America and the Mineralogical Association of Canada. This database,…
The influence of stress and fatigue under various stress amplitudes on the magnetic properties of a range of magnetic alloys (Ni, Fe55Ni45, Fe64Ni36 and Fe54Ni29Co17) was studied. Barkhausen effect signal and symmetrical minor hysteresis loops were measured at various stages during the tensile and fatigue tests. The d…
A unified theory of the liquid‐glass transition based on the two band model in the harmonic potential approximation is presented. The Kauzmann paradox on the Kauzmann entropy crisis and the Vogel‐Tamman‐Fulcher (VTF) law on the relaxation times and the transport coefficients are elucidated. The hopping of the particle…
This paper discusses the systems for microcellular injection moulding developed and patented by Trexel and IKV. It then introduces a third design with initial findings and recommendations for modifications. The results suggest that microcellular foaming is possible introducing supercritical carbon dioxide in the nozzl…