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。
A selective resonant Raman enhancement is observed in solid films of the blue complex formed between starch and iodine. The intensity of the 162-${\mathrm{cm}}^{\ensuremath{-}1}$ phonon peak is strongly enhanced when the laser frequency is resonant with the main electronic absorption band at \ensuremath{\simeq} 590 nm…
The bulk moduli of Fe 70 Ni 30 , Fe 65 Ni 35 and Fe 72 Pt 28 Invar alloys are obtained by measuring the lattice constants under high pressure up to about 100 kbar using X-ray diffraction technique. Large changes in bulk modulus are observed at ferromagnetic to paramagnetic phase transition. The temperature dependence…
Thermogravimetric studies have been carried out for the reaction of H2O (D2O) with pure graphite surfaces and with graphite surfaces containing BaCO3 catalyst. At temperatures near 1200 K the kinetic isotope effect has been measured to be about a factor of 2 for both pure graphite and BaCO3–graphite. This value of the…
Pressure effect on the spontaneous volume magnetostriction ω s of Fe-Ni and Fe-Pt Invar alloys is studied by measuring the pressure dependence of lattice constants usins X-rav diffraction technique. The pressure derivative of ω s and the magnetic contribution to the compressibility in Fe-Ni Invar alloy near 0 K are fo…
The system ${\mathrm{O}}_{2}$ on Ti(0001) has been investigated using appearance potential spectroscopy (APS), Auger electron spectroscopy (AES), low-energy electron diffraction (LEED), and work-function measurements obtained by the field-emission retarding potential technique. A strong band of states just above the F…
Analysis of the ($00l$) x-ray diffractograms of graphite intercalation compounds reveals important structural information concerning these compounds. In particular, the in-plane intercalate density is observed to depart from the commonly accepted stoichiometric values. This result has important implications concerning…
High-resolution absorption spectra of Nd3+ in LiYF4 were recorded between 3900 and 40 200 cm−1 at temperatures from 10 to 300 K. The levels were obtained by diagonalizing a Hamiltonian that describes the free ion parameters, including two and three-body configuration interactions, as well as the crystal field operator…
The removal of N2(A 3Σ+u, v′ = 0,1) by O has been studied in a room temperature discharge–flow apparatus by monitoring the temporal decay of the 0,6 and 1,10 bands of the Vegard–Kaplan system. The measured rate constants are (2.8±0.4) and (3.4±0.6)×10−11 cm3 molecule−1 s−1 for v′ = 0 and 1, respectively.
The (001) surface of tungsten trioxide has been examined with ultraviolet photoemission spectroscopy. Results are presented for the defect-free surface using photon energies of 16.85, 21.22, and 40.82 eV and compared with x-ray photoemission spectra and a bulk density of states calculated for cubic W${\mathrm{O}}_{3}$…
A new model is proposed for explaining the nonlinearity in the response characteristics of three common thermoluminescent phosphors (CaSO 4 :Dy, CaF 2 :Dy and Mg 2 SiO 4 :Tb). The increased trapping of charge carriers in the dosimetry traps during irradiation, due to a reduction in trapping efficiency of deep traps ca…
Reports measurements of electron emission yields of clean molybdenum surfaces under bombardment with H + , H 2 + , D + , D 2 + , He + , N + , N 2 + , O + , O 2 + , Ne + , Ar + , Kr + and Xe + in the wide energy range 0.7-60.2 keV. The clean surfaces were produced by inert gas sputtering under ultrahigh vacuum. The res…
Abstract Das Prinzip der Kautschuk‐Modifizierung von Thermoplasten wird kurz erläutert. Berichtet wird über die Elastifizierung von Polybutylenterephthalat, Polyamiden und Polycarbonaten mit Butadienpfropfpolymerisaten. Die Kerbschlagzähigkeit, insbesondere bei tiefen Temperaturen (−40°C), wird erheblich verbessert, o…
Viscosities of several compositions in the albite‐anorthite system (Ab 80 An 20 , Ab 50 An 50 , and Ab 25 An 75 ) were measured over a wide range of temperature (800°–1600°C). The log η versus 1/ T relations for all compositions show continuous curvature. In the high‐temperature region ( T >1200°C) the viscosity in…
Discommensurations and dislocations in the incommensurate charge-density-wave structure of $2H$-Ta${\mathrm{Se}}_{2}$ have been observed directly by dark-field transmission electron microscopy with use of satellite reflections produced because of the phase transition. We have imaged the domain structure in the striped…
About 25 000 tons of RE Metals - calculated as oxide - are currently consumed in the world per year. This quantity is divided among a dazzling variety of applications. In order to bring a certain systemization into this variety, these applications and possible applications have been reviewed from 3 different aspects:…
The emergence of new titanium fabrication techniques has opened up new possibilities for achieving high structural efficiency at considerably reduced costs. Superplastic forming/diffusion bonding (SPF/DB), combined with conventional metallurgical joining techniques, has been shown to effect weight reductions in future…
When crosslinked polyester-cotton blend fabrics came into general use about fifteen years ago, problems of soil retention that are inherent with these fabrics were soon recognized. Many studies were conducted to identify the factors responsible for soiling and soil retention in blends, and to develop finishes capable…
Maxima and minima are tabulated for the Bessel functions Jn(x) for values of n from 0 to 30 [i.e. zeros of J'n(x)]. The first six points are recorded for each function. The table considerably extends the range of earlier tables available in the literature. It should have applications in the interpretation of diffracti…
Belterra Clay is a uniform, yellowish kaolinitic clay lacking visihle stratification. It overlies laterite plateaus with a maximum thickness of 20 m. The clay is derived from a lateritic terrane occuring outside and within the Amazonian bauxite belt. Redistribution of clay material from the basal layers of the laterit…
p-n-alkoxycinnamoyl cholrides when treated with p- hydroxyacetophenone yield a homologous series ofmesogens. The first member is a monotropic nematogen; exhibition of enantiotropic nematic mesophase begins from the second memeber and persists up to the butyl derivative. Both smectic and nematic mesophases are exhibite…