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。
Macrocyclic crystalline dibutyltin succinate (Bu2SnSuc) and adipate (Bu2SnAd) were prepared in high yields from Bu2SnO and dicarboxylic acid. According to vapor pressure osmometry and MALDI-TOF mass spectrometry, Bu2SnSuc is a cyclic trimer and Bu2SnAd a cyclic dimer. These macrocycles initiate a faster polymerization…
The basic mechanism for an one transistor memory device has been studied. Many ferroelectric materials such PbZrxTi1−xO3 (PZT), SrBi2Ta2O9 (SBT), Pb5Ge3O11 (PGO) etc. were analyzed for this application. Because of its low remanent polarization and low dielectric constant, the c-oriented Pb5Ge3O11 thin film was selecte…
We have investigated the formation and development of memory states in polymer dispersed liquid crystals induced by the application of a strong electric field. Both the optical transmittance and polarization field have been followed as functions of time. We have been able to distinguish between the contributions to th…
Blending of nitrile rubber with plasticised PVC produces vinyl-based thermoplastic elastomers. These materials offer a versatile range of properties and are used in numerous applications; such as glazing gaskets, footwear, cable jacketing, hose, tubing and coated fabrics. In this paper it is discussed how the properti…
Since the mid-1980s, there has been a growth of interest in the search and development of molecular second-order nonlinear optical (NLO) materials that possess various device applications. Beside the most traditional donor-acceptor (“push-pull”) organic chromophores (e.g. the stilbene family), chemists have increasing…
We study the transmission of light through different kinds of Fibonacci dielectric multilayers (FDM). We exploit a transfer matrix renormalization technique previously introduced by us [E. MaciÁ, Appl. Phys. Lett. 73, 3330 (1998)] to obtain closed analytical expressions for the transmission coefficient under arbitrary…
The Leibler theory [L. Leibler, Macromolecules 13, 1602 (1980)] for microphase separation in AB block copolymer melts is generalized for systems with arbitrary topology of molecules. A diagrammatic technique for calculation of the monomeric correlation functions is developed. The free energies of various mesophases ar…
The broadening of X-ray peak profiles and movements of tensile axes were obtained simultaneously in single-slip-conditioned copper single crystals. Two types of sample showed different tensile axis movements and slip system activities. These results are in accord with the observation of slip lines with scanning electr…
The current state of the art and future perspectives for protein crystallography with neutrons have been reviewed and discussed at an international workshop recently organized by the Hahn-Meitner-Institut (HMI) and Max-Delbrück-Center (MDC) in Berlin, and supported by the Neutron Round Table activity. The main topics…
Abstract The results of the sonolysis of water and aqueous 2-methyl-2-propanol under a rare gas atmosphere suggest that increasing the solubility of the rare gas in water significantly enhances the rate of sonolysis but their thermal conductivity does not significantly affect the temperature of the cavitation bubbles.
Various non-180° domain and heterophase structures, observed in relaxor-based (1−x)Pb(Mg⅓Nb⅔)O3 - xPbTiO3 single crystals with various Ti4+ -concentration in a wide temperature range, have been analyzed using the concepts of zero-net-strain planes. The interfaces between the coexisting Pmm, P4 mm and R3 m phases, and…
Slow strain rate testing of solution-annealed (σ0.2 = 552 MPa [80 ksi]) and cold-worked (σ0.2 = 1,068 MPa [155 ksi]) 22%Cr duplex stainless steels (DSS) was conducted at different hydrogen charging currents in acid-brine solutions at 80°C (176°F). The charging currents and environments were designed to simulate coupli…
Investigates the adhesion and corrosion performance of selected silanes in primed galvanised steel. For comparison HDG steel was also treated with a chromate‐free and a chromate‐containing pre‐treatment. All treated panels were painted with three different primers. Corrosion resistance and paint adhesion of the primed…
Abstract The equilibrium between the enol form and the keto form in the triplet state of salicylideneanilines and salicylidenebenzylamines 1 in non-polar solvent has been explored based on the observation of phosphorescence and T–T absorption spectra.
Phase transitions in ferroelectromagnet materials in which a ferroelectric order exists below an antiferromagnetic transition temperature is investigated using Monte-Carlo method, based on a hybrid Ising-DIFFOUR model. The magnetization, electric polarization and their susceptibilities as well as magnetoelectric coupl…
The improvement of medical health care during the past years has led to an increased use of implants. The requirements placed on implant materials are determined by medical progresses and biological demands. Metallic biomaterials are the dominating group of materials for use as highly tension loaded implants. Among th…
In this paper the bulk, surface and interfacial structures of a series of polyureas containing polydimethylsiloxane segments are examined. The silicone polyureas studied here all contain 25 wt% of a 5,000 molecular weight aminopropyl-terminated polydimethylsiloxane diamine, along with various ratios of a 900 molecular…
The kinetics of sorption of atomic hydrogen by pyrolytic, quasi-single-crystal, and RGT commercial-grade graphite was studied. The processes of sorption and subsequent thermal outgassing are shown to proceed in a similar manner for all the three types of graphite. Thermal desorption spectra obtained during linear heat…
SrAl 2 O 4 activated with Eu phosphors has been known to exhibit high brightness and long-lasting phosphorescence without radioactive materials. In this paper, SrAl 2 O 4 :Eu thin films have been successfully deposited on Si(100) or graphite substrates using an intense pulsed ion-beam evaporation technique. The result…
Magnesiumbasiswerkstoffe weisen neben einem der Kortikalis sehr gut angepaßten E-Modul von 45 GPa auch eine hohe physiko-chemische Biokompatibilität durch den essentiellen Charakter des Magnesiums auf. Die Biodegradation von Magnesium-Legierungen kann für temporäre Implantate vorteilhaft genutzt werden. Es wird der Ko…