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 suitability of stabilized amorphous selenium (a-Se:0.2-0.5% As, 10-20 ppm Cl) as an x-ray imaging photoconductor is largely determined by its charge-generation, transport and trapping properties. The product of the charge-carrier drift mobility, , deep-trapping lifetime, , and applied electrical field, F , known a…
Methods for the evaluation of the accuracy of crystal structures of proteins and nucleic acids are of general importance for structure-function studies as well as for biotechnological and biomedical research based upon three-dimensional structures of biomacromolecules. The structure-validation program DDQ (difference-…
Thermally stimulated current (TSC) spectroscopy is widely used to understand dielectric relaxation in complex solid systems. However, when these systems contain free and bound charges, it appears that TSC spectra exhibit multicomponent signals, due both to dipolar and to space-charge relaxation. In this work, we propo…
In this work, magnetization studies on quasi bi-dimensional nanoparticles of Pd encapsulated in a graphite host as a function of magnetic field and temperature are presented. We found that an important magnetic signal can be attributed to the Pd nanoparticles. The obtained magnetic behaviour is interpreted in view of…
Preface. Loss of stability and post-buckling behaviour. Summation theorems concerning critical loads of bifurcation. Interaction of different buckling modes in the post-buckling range. Stability of elastic structures with the aid of the catastrophe theory. Buckling of frames. Application of the sandwich theory in the…
In the present paper the formation of space charge in irradiated low-density polyethylene (LDPE) was investigated using the pulsed electroacoustic (PEA) technique. Specimens of LDPE, /spl sim/100 /spl mu/m thick, were irradiated to various doses at room temperature in a /sup 60/Co /spl gamma/ source in one of three di…
Silica-supported molybdenum oxide catalysts have been prepared by liquid and gas phase deposition, followed by calcination of the deposited molybdenyl acetylacetonato complex. Fourier-transform infrared spectroscopy indicated a hydrogen bonding anchorage mechanism for the liquid phase deposition and a two step reactio…
It is known that mesophase changes can be induced by E-Z photoisomerization of azobenzenes doped in liquid crystals. Novel azobenzenes have been designed on the basis of Molecular Mechanics and Molecular Orbital calculation, aimed at exploiting novel photoresponsive guest-host liquid crystalline systems exhibiting no…
Dicholesteryl esters of diacetylenedicarboxylic acid with different lengths of methylene linkages were synthesised. Compounds with (CH 2 ) n (n = 2, 4, 5, 6, 7, 8, 10) showed a cholesteric phase. Phase transition temperatures from the isotropic phase to the anisotropic phase showed an odd–even effect of the number of…
A survey of 100 young women's body measurements was undertaken during 1992/93. The findings are the basis of Part 3, which aims to explain how size charts are developed for garments; to evaluate the measuring equipment used and to compare the size chart body measurements with those proportionally derived by traditiona…
ABSTRACT Films plasticized with polyethylene glycol were cast from alkaline (pH 10.5, 11.0, or 11.5), aqueous egg white (EW) solutions with or without heating (40°C for 30 min). Prior to casting, concentration of surface sulfhydryl (SH) groups was determined and they increased (P < 0.05) (3.81–19.45 μM/g protein) w…
In this study we presented a double-grid method for efficient computation of complex dendritic pattern evolving in a large scale solidifying system of pure undercooled melt. The method, which is based on the large difference in phase-field diffusivity and thermal diffusivity in pure material, enables us to use a large…
The unique polyoxometalate compound Na20[{MoVIO3- (H2O)}10{VIVO(H2O)}20{(MoVI/MoVI5O21)(H2O)3}10({MoVI- O2(H2O)2}5/2)2 ({NaSO4}5)2]·xH2O 1 (x ≈ 170) shows remarkable structural features: e.g. (i) {MoVI/MoVI5}-type pentagons as building blocks (being present in the relevant reaction medium as disposition), (ii) a ‘magn…
The use of on-line partial discharge (PD) measurements as an indicator of stator winding insulation condition, is well known. Trending results from on-line PD measurements over time, often allows maintenance personnel to become aware of developing stator insulation problems in motors and generators, and take correctiv…
Chemical states and structures of thin degenerated layers grown on the surface of (Ba, Sr)TiO 3 (BST) films are investigated by X-ray photoelectron spectroscopy (XPS). It was found that decomposition occurred as a result of the air exposure and also as a result of annealing. A careful study of a Ba 3d peak in the XPS…
The effect of thermal fluctuations of magnetization on static and dynamic properties is discussed for nanocrystalline FePt films. The large magnetocrystalline anisotropy K/sub u/ of L1/sub 0/ type FePt results in large K/sub u/V/(kT) values of more than 70 even for very fine grain sizes of 7-8 nm, indicating the poten…
Extensive high-resolution magnetic-susceptibility (\ensuremath{\chi}) measurements have been performed along the c axis (easy direction of magnetization) of a high-purity gadolinium single crystal in the reduced temperature range $5.1\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}5}<~\ensuremath{\epsilon}=(T…
The advantages offered by ferroelectric films deposited directly onto silicon in memory applications, field effect devices and pyroelectric detectors have stimulated intense research activity. This review covers work carried out during the last several years on their growth, characterization and device fabrication usi…
In this review article, the history of the development of fluorochemicals used as repellents for textiles is elucidated from a 3M perspective. The synthetic approaches to manufacturing fluorochemical polymers and the physico-chemical properties of surfaces treated with fluorochemical materials are described. In additi…
Aliphatic polyether dendrons exhibit easily modified surface functionality.