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。
Structural models of alkali tellurite glasses, (M 2 O) x (TeO 2 ) l- x with M = Li, Na, K are presented. The glass structure was studied with neutron and X-ray diffraction, and, in the case of sodium, NMR. Real-space models of the glass structure were built using the reverse Monte Carlo algorithm. The distribution of…
The non-reversing heat flow, Δ H nr ( x ) near T g in ternary Ge x As x Se 1 − 2 x glasses is examined by temperature-modulated differential scanning calorimetry. The Δ H nr ( x ) term shows a deep minimum (which is almost zero) in the 0.09 < x < 0.14 range, identified with the intermediate phase , and an increase, bo…
Performance of plastics , Performance of plastics , مرکز فناوری اطلاعات و اطلاع رسانی کشاورزی
Ferromagnetic transition in three-dimensional double-exchange models is studied by the Monte Carlo method. Critical temperature $T_{\rm c}$ is precisely determined by finite-size scaling analysis. Strong spin fluctuations in this itinerant system significantly reduce $T_{\rm c}$ from mean-field estimates. By choosing…
The depletion interaction between two spheres due to nonadsorbing ideal polymers is calculated from the polymer concentration profile using the excess (negative) adsorption. Computer simulations show that the polymer concentration profiles around two spheres are well described by the product function of the concentrat…
We report the first scanning tunneling microscopy (STM) study of single-crystalline anatase. Atomically resolved images of the (101) surface are consistent with a bulk-truncated $(1\ifmmode\times\else\texttimes\fi{}1)$ termination. Step edges run predominantly in the [010], $[1\ifmmode\bar\else\textasciimacron\fi{}11]…
Chiral amide- and urea-type organic gelators (1-6), based on cyclohexanediamine, have been prepared, and the superstructures of the organogels were evaluated by circular dichroism (CD), transmission electron microscopy (TEM), and scanning electron microscopy (SEM). The CD spectrum of the amide-based organogel system 1…
The combination of the long-lived, spectrally pure emission of YbIII ions with the outstanding light-absorbing capabilities of organic dyes gives photoluminescent lanthanide complexes that are interesting candidates for use as a new class of luminescent labels for molecules of biomedical interest. The water-soluble co…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTRapid and Controlled Polymerization of Lactide by Structurally Characterized Ferric AlkoxidesBrendan J. O'Keefe, Susanne M. Monnier, Marc A. Hillmyer, and William B. TolmanView Author Information Department of Chemistry, University of Minnesota 207 Pleasant Street SE,…
Molecular-dynamics simulations were employed to study deformations on nickel nanowires subjected to uniaxial strain at 300 K using a recently reported embedded-atom (many body) model potential. This embedded-atom model can reproduce exactly the experimental second-order and third-order elastic moduli as well as the ph…
Characterization of a series of correlated electron-spin resonance (ESR) and photoluminescence (PL) lines in diamond grown by chemical vapor deposition is reported. The series consists of a set of structured PL bands in the range 1.8--2.3 eV, and ESR lines due to an $S=1$ center with $g=2.0039(1)$ and $D=35.8(1) \math…
In this paper we investigate theoretically the ground-state NiAs-type structure of MnAs and we compare the magnetic and structural properties with a hypothetical zinc-blende structure. A zinc-blende structure can be obtained, in principle, from the diluted magnetic semiconductor ${\mathrm{Ga}}_{1\ensuremath{-}x}{\math…
Regioregular poly(3-hexylthiophene) (P3HT) produces thermoreversible gel in xylene. The gel is brownish-red in color. SEM and TEM studies indicate the presence of fibrillar network. WAXS and electron diffraction pattern indicate the presence of P3HT crystallites in the gel. The gels exhibit a first-order phase transit…
Oxidation of malate to oxaloacetate in Escherichia coli can be catalyzed by two enzymes: the well-known NAD-dependent malate dehydrogenase (MDH; EC 1.1.1.37) and the membrane-associated malate:quinone-oxidoreductase (MQO; EC 1.1.99.16), encoded by the gene mqo (previously called yojH). Expression of the mqo gene and,…
The electronic properties of carbon nanotubes are investigated in the presence of disorder and a magnetic field parallel or perpendicular to the nanotube axis. In the parallel field geometry, the ${\ensuremath{\varphi}}_{0}$-periodic $({\ensuremath{\varphi}}_{0}=hc/e)$ metal-insulator transition induced in metallic or…
We report high-resolution Compton profiles (CP's) of Al along the three principal symmetry directions at a photon energy of 59.38 keV, together with corresponding highly accurate theoretical profiles obtained within the local-density approximation (LDA) based band-theory framework. A good accord between theory and exp…
Thin films of the charge-ordered (CO) compound ${\mathrm{Pr}}_{0.5}{\mathrm{Ca}}_{0.5}{\mathrm{MnO}}_{3}$ have been deposited onto (100)-oriented ${\mathrm{SrTiO}}_{3}$ substrates using pulsed laser deposition. Magnetization and transport properties are measured when the thickness of the film is varied. While the thin…
The magnetic interaction of a pair of bound magnetic polarons (BMP) in diluted magnetic semiconductors (DMS) is analyzed via a generalized Hubbard-type Hamiltonian for two carriers in the presence of effective magnetic fields arising from the magnetic polarization of their respective polarons. For the case where the m…
Information on the energy of $5d$ levels of ${\mathrm{Ce}}^{3+}$ in chloride, bromide, and iodide compounds has been collected. From this, values for the centroid shift and the crystal field splitting of the $5d$ configuration are obtained. The centroid shift will be related to the polarizability of the anions and fur…
An elastic model is presented for column buckling of a multiwalled carbon nanotube embedded within an elastic medium. The emphasis is placed on the role of interlayer radial displacements between adjacent nanotubes. In contrast to an existing model which treats the entire multiwalled nanotube as a single column, the p…