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。
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTLeptosphaerones A and B, New Cyclohexenones from Leptosphaeria herpotrichoidesWilliam A. Ayer, Türkan Gökdemir, Shichang Miao, and Latchezar S. TrifonovCite this: J. Nat. Prod. 1993, 56, 9, 1647–1650Publication Date (Print):September 1, 1993Publication History Published onli…
Polarized infrared spectroscopy was used to characterize molecular orientation in polyimide films deposited on silicon wafers. The films were constructed from a single polyimide having a rodlike molecular skeleton. The degree of in-plane orientation at the interface with the wafer in the film varied with film thicknes…
Abstract The case of temperature quenching of luminescence of broad‐band emitters is examined. On the basis of published and newly acquired data, it is concluded that the theory of nonradiative transitions based on coupling to a single vibrational mode, whether calculated in the Mott‐Seitz terms or improved by the pro…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAdsorption and thermal decomposition of methanol on 3d transition metal (iron, nickel, titanium) aluminides: FeAl(110), NiAl, and TiAlBor Ru Sheu and D. R. StronginCite this: J. Phys. Chem. 1993, 97, 39, 10144–10151Publication Date (Print):September 1, 1993Publication Histor…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectronic effects in transition metal porphyrins. 7. Synthesis and spectroscopic investigations of a series of octasubstituted porphyrin isomers and their iron(III) complexesMeden F. Isaac, Qing Lin, Ursula Simonis, Daniel J. Suffian, Debra L. Wilson, and F. Ann WalkerCite…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMicrowave modulated and thermal modulated photoluminescence studies of 2H-lead iodideE. Lifshitz and L. BykovCite this: J. Phys. Chem. 1993, 97, 37, 9288–9292Publication Date (Print):September 1, 1993Publication History Published online1 May 2002Published inissue 1 September…
Abstract The dielectric behavior of glassy thermoplastic polymer in the microwave frequency range was investigated. Specifically, the relationship between energy absorption and temperature for several thermoplastic systems was examined to test the theoretical basis for heating under microwave irradiation. Irradiation…
Efficient blue light generation by SHG for use in optical storage etc. requires materials that display not only a large nonlinear response and but also optical transparency at the wavelengths of both the laser and the blue light. New chromophores containing sulfonamide, sulfonate, or sulfoximide groups are described t…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMonitoring jet fuel thermal stability using a quartz crystal microbalanceE. A. Klavetter, S. J. Martin, and K. O. WessendorfCite this: Energy Fuels 1993, 7, 5, 582–588Publication Date (Print):September 1, 1993Publication History Published online1 May 2002Published inissue 1…
Thermal recovery of radiation defects and microstructural change in UO2 fuels irradiated under LWR conditions (burnup: 25 and 44 GWd/t) have been studied after annealing at temperature range of 450-1,800°C by X-ray diffractometry and transmission electron microscopy (TEM). The lattice parameter of as-irradiated fuels…
A new solid solution, (Bi 1- x Pb x )(Ni (1- x )/2 Ti (1+ x )/2 )O 3 (BPNT-100 x ) (0.3≤ x ≤0.5), is studied for their dielectric, ferroelectric, piezoelectric and mechanical properties as a new group of piezoelectric ceramics. The crystal phase of the solid solution is a perovskite structure with x ≥0.3. The BPNT-100…
The P1\ifmmode\bar\else\textasciimacron\fi{}-P2/c ferroelastic phase transition in ${\mathrm{Zn}}_{0.75}$${\mathrm{Cu}}_{0.25}$${\mathrm{WO}}_{4}$ has been studied as a function of temperature by infrared spectroscopy. Many of the midinfrared features (associated with ${\mathrm{WO}}_{6}$ octahedral vibrations) do not…
The optical absorption spectra of fine grained polycrystalline thin films of lithium tungsten bronze are reported. The results are similar to the previously reported data for hydrogen and sodium tungsten bronzes: pointing to the secondary importance of the nature of the guest atom. The visible blue color band, peaking…
Brain perfusion SPECT imaging using Tc-99m ethyl cysteinate dimer (ECD) was carried out in 12 patients with chronic cerebrovascular disease. The sensitivity of lesion detection and lesion-to-normal tissue contrast was compared with those of I-123 IMP and Tc-99m HMPAO. Eight patients underwent all three studies and the…
Binary mixtures of two compounds with phase sequences isotropic (I)--chiral-nematic (N)--chiral-smectic-C (${\mathit{C}}^{\mathrm{*}}$) and I--N--smectic-A (A)--${\mathit{C}}^{\mathrm{*}}$ have been investigated. Spontaneous-polarization and tilt-angle measurements near the A-${\mathit{C}}^{\mathrm{*}}$ transition ind…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTInternal electric field and second harmonic generation in the blends of vinylidene fluoride-trifluoroethylene copolymer and poly(methyl methacrylate) with a pendant nonlinear optical dyeNaoto Tsutsumi, Tsuyoshi Ono, and Tsuyoshi KiyotsukuriCite this: Macromolecules 1993, 26,…
A metal-metal transition followed by a structural transition near room temperature was found in the solid solutions between cubic ${\mathrm{ZrB}}_{12}$ and tetragonal ${\mathrm{ScB}}_{12}$, i.e., in ${\mathrm{Zr}}_{1\mathrm{\ensuremath{-}}\mathit{x}}$${\mathrm{Sc}}_{\mathit{x}}$${\mathrm{B}}_{12}$ with compositions in…
Two rotational isomers of an ethylene derivative could for the first time be prepared and structurally characterized: the almost planar 1 and the twisted 2, which probably has the largest twist angle (approximately 50°) of all symmetrically substituted ethylenes yet synthesized. The longest wavelength absorption maxim…
The paramagnetic-excitation spectrum of ${\mathrm{TbPO}}_{4}$ has been investigated by means of inelastic neutron-scattering techniques, and the observed crystal-field transitions were analyzed using a Hamiltonian that included the atomic free-ion and crystal-field interactions for an ${\mathit{f}}^{8}$ configuration.…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMorphology of poly(styrene-block-butadiene-block-styrene) triblock copolymers crosslinked in the disordered stateShinichi Sakurai, Kazuyoshi Iwane, and Shunji NomuraCite this: Macromolecules 1993, 26, 20, 5479–5486Publication Date (Print):September 1, 1993Publication History…