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。
SUMMARY The influence of selective removal of organically bonded metals and organic matter on soil microstructure was investigated. Two samples of soils with different mineralogical, chemical and mechanical composition were treated with acetylacetone in both polar and non‐polar solvents to dissolve amorphous organic i…
High energy resolution XPS spectra of sputter cleaned Ni (2 keV, Ar+1) are presented. The experimental width (16%–84% measurement) of the Fermi level was 0.32 ± 0.02 eV. The energy scale calibration is based on the Fermi level.
The use of NaBH4 as a chemical reductant to precipitate copper from water has been studied. Initial Cu2+ concentrations of 25 and 40 mg/L have been checked, and complete removal can be achieved. When solid NaBH4 is fed, BH4 − to Cu2+ molar ratios higher than 2 were needed. This can be substantially improved by using N…
DC field measurements of lambda , d/sub 33/, k/sub 33/, and mu under uniaxial prestresses up to approximately 20 MPa have made on a 152-mm-long 6-mm-diameter grain-oriented rod of Tb/sub 0.3/Dy/sub 07/Fe/sub 1.95/ prepared by a free float zone technique. The lambda -vs.-H curve shows a negative dip at low fields which…
<div class="htmlview paragraph">An exhaust gas after-treatment system was developed to reduce oxides of nitrogen (NOx) emissions from a heavy duty diesel derived natural gas engine. The goal of the project was to reduce NOx emissions by 80% with a minimum ammonia slip and without negatively impacting other exhau…
A general description of the mutual orientation of two lattices is presented for the cases where the orientation is `rational'. The coincidence site and displacement-shift complete lattices are genuine lattices whose parameters can be explicitly evaluated through a method based on the Smith normal form for integer mat…
Abstract Sudoite occurs as a cryptocrystalline clay in some Visean K-bentonites from Belgium. Usually associated with illite-smectite mixed-layers, this chlorite has been found locally as a monomineralic clay component of a K-bentonite bed. The mineral has a composition close to (Al 3 Mg 2 )(Si 3 Al)O 10 (OH) 8 . The…
Abstract Cyanine dyes bound to α-helical poly(L-lysine·HBr) (PLL·HBr) in methanol provide extremely strong exciton couplings in CD spectra caused by their R-chiral dimer formation and that dyes-PLL complexes show varying degrees of remarkable strength change in the CD recognizing on their methylene numbers upon additi…
Emission and excitation spectra and luminescence decay times of the SrS:Sb 3+ and SrSe:Sb 3+ powder phosphors are studied over the temperature range from 2 to 372 K. The emission band at 293 K is located at 600 nm for SrS:Sb 2 S 3 (0.05 mol%) and at 633 nm for SrSe:Sb 2 S 3 (0.2 mol%). The excitation processes are att…
The hydrogenation disproportionation desorption recombination (HDDR) process has been established as an effective processing route for the production of isotropic NdFeB coercive powder. By the addition of very small amounts of zirconium to the initial composition, it has also been found that anisotropic powder can be…
The magnetic properties and synthesis of the magnetically hard strictly two element Sm/sub 5/Fe/sub 17/ phase were studied for sputtered film samples. Normally, bulk sample synthesis of this phase has required the substitution of at least 10 at.% of a transition metal, such as Ti for the Fe, to stabilize this phase. I…
Abstract Previously 90 MHz CW-NMR spectroscopy has been used to estimate the crosslink density in individual components of elastomer blends. Transfer of the technique to a 300 MHz FT instrument is not straightforward. Chemical shifts of polymer resonances in spectra of single-polymer vulcanizates are dependent on cros…
We have observed birefringent spirals induced by a field in a fingerprint texture of a cholesteric polymer in solution in a nematic low molar weight liquid crystal. This paper describes the conditions of nucleation of these spirals and the part of different parameters which determine their characteristics.
Abstract Two new types of liquid crystals, 5-(4-alkanoylaminophenyl)-2-alkanoylaminotropones and 5-(4-alkanoylaminophenyl)-2-alkanoyloxytropones, were prepared. The former showed the smectic A phase and the latter did the smectic A and C phases. The 1H NMR spectra indicated the former to be in intramolecularly hydroge…
Natural MoS2 was investigated by scanning tunneling microscopy operated in air. The atomic resolution image yields the hexagonal symmetry of the surface of the crystal with lattice constant of 3.1 Å, in agreement with the reported x-ray crystallographic value. Corrugations along the [110] cell diagonal show major and…
Full characterization of particulate recording media requires the modeling of both the reversible and the irreversible components of the magnetization. Experiments show that the height of minor loops originating from negative saturation is not an even function of the magnetization. A moving Preisach-type model with re…
Biocorrosion means any process of corrosion in wich microorganisms are somehow involved. As far as the petroleum industry is concerned, the anaerobic type is the more important, with Sulphate-Reducing Bacteria (SRB) accouting for half of the described processes. SRB are obligate anaerobs that use sulphur, sulphate or…
The heat capacities of liquid Li 2 SiO 3 and Li 2 Si 3 O 7 have been determined through drop calorimetry measurements to complement available data on lithium, sodium, and potassium silicate melts. The composition and temperature dependences of the heat capacity depends specifically on the nature of the alkali element,…
Frequency-dependent complex impedances were measured in Nb-doped (Ba 0.6 Sr 0.4 )TiO 3 PTC (positive temperature coefficient) ceramics. The complex impedance data were analyzed in Cole-Cole-type equivalent circuits by the computer fitting method in order to determine individual resistance and capacitance values of the…
We report a system capable of obtaining Raman spectra during growth of carbon films in a hot filament reactor. A gated, multichannel detection system was used to discriminate against the high levels of background radiation produced by the hot substrate and the hot filament. The ability to detect and distinguish betwee…