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 Mo-substituted Nd(Fe,Mo)/sub 12/N/sub x/ compounds are investigated. The ThMn/sub 12/ crystal structure has been obtained for the RFe/sub 11/Mo composition by optimizing the solution treatment temperature, and the magnetic properties of RFe/sub 11/MoN/sub x/ have been measured. The NdFe/sub 11/MoN/sub x/ shows lar…
Aus hifunktionellen Polyethylenglycolen und dendritischen aromatischen Polyethern 1 mit Bromsubstituenten am Zentrum des Makromoleküls entstehen in einer quantitativ verlaufenden Reaktion Blockcopolymere. Diese bilden in Lösungsmitteln, in denen sich beide Blöcke sehr schlecht oder sich ein Block selektiv gut löst, Mi…
Abstract The isothermal crystallization of linear polyethylene fractions was studied by means of simultaneous measurements of wide‐angle X‐ray scattering (WAXS) and small‐angle X‐ray scattering (SAXS) employing synchrotron radiation. From WAXS the overall degree of crystallinity x c was determined. From SAXS, the scat…
The first polyhydroxy acid (PHA) synthase gene (phbCRr) of a Gram-positive bacterium was cloned from a genomic library of Rhodococcus ruber in the broad-host-range plasmid vector pRK404. The hybrid plasmid harboring phbCRr allowed the expression of polyhydroxybutyric acid (PHB) synthase activity and restored ability o…
Stoichiometric quantities of AR‐grade chemicals, e.g., Ba(NO 3 ) 2 , Sr(NO 3 ) 2 , and Nb 2 O 5 , were used to synthesize Sr 0.5 Ba 0.5 Nb 2 O 6 (SBN:50) by the solid‐state reaction route. The reaction mixture was characterized by DTA/TG/DTG to locate the formation temperature of SBN:50. X‐ray diffrction was used to i…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSyntheses and multinuclear NMR characterizations of .alpha.-[SiMo2W9O39]8- and .alpha.-[SiMo3-xVxW9O40](4+x)- (x = 1, 2) heteropolyoxometalatesEmmanuel Cadot, Rene Thouvenot, Andre Teze, and Gilbert HerveCite this: Inorg. Chem. 1992, 31, 20, 4128–4133Publication Date (Print)…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructures, bonding, and absorption spectra of amine-sulfur dioxide charge-transfer complexesMing Wah Wong and Kenneth B. WibergCite this: J. Am. Chem. Soc. 1992, 114, 19, 7527–7535Publication Date (Print):September 1, 1992Publication History Published online1 May 2002Publis…
The phase transition behavior in the systems of (1- x )Pb(Mg 1/3 Nb 2/3 )O 3 - x PbTiO 3 (PMN-PT) and 0.99Pb 1- y La 2 y /3 TiO 3 -0.01MnO 2 (PLT) relaxor ferroelectrics has been investigated to explore the nature of diffused phase transitions (DPT) in these materials. All the dielectric constant (ε)-temperature ( T )…
The search for κ‐phases of conducting and superconducting organic cation radical salts is difficult because it is not yet known which characteristics of the donor molecule are required for this structure to be generated. The figure shown the hydroxy‐methyl‐functionalized non‐centroxymmetrical donor EDT‐TTF(CH 2 OH), w…
We present results of the dc magnetization of single-crystalline \ensuremath{\kappa}-(BEDT-TTF${)}_{2}$Cu[N(CN${)}_{2}$]Br. From the slope of the linear M(lnH) dependence of the reversible magnetization, the magnetic penetration depth \ensuremath{\lambda}(T) is estimated. At low temperatures, \ensuremath{\lambda}(T) s…
Hysteresis loops and domain structure of as-cast Fe-rich and stress-annealed low magnetostrictive Co-rich bistable wires have been investigated as functions of the distance to the end of wires with different lengths. From the analysis of the changes of the squareness ratio and differential susceptibility at remanence,…
The pH dependence of the kinetic parameters of pepsin, rhizopuspepsin, and their active-site hydrogen bond mutants has been determined. These data have permitted the calculation of two active-site ionization constants in the free enzymes (pKe1 and pK32) and in the enzyme-substrate complexes (pKes1 and pKes2). The pKe1…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAtom-based modeling of amorphous 1,4-cis-polybutadieneYong Li and Wayne L. MatticeCite this: Macromolecules 1992, 25, 19, 4942–4947Publication Date (Print):September 1, 1992Publication History Published online1 May 2002Published inissue 1 September 1992https://pubs.acs.org/d…
The gas-phase interstitial modification of rare-earth intermetallics is studied. Net reaction energies for nitrogen in Sm/sub 2/Fe/sub 17/ and Nd(Fe/sub 11/Tl) are U/sub 0/=-57 kJ/mole and U/sub 0/=-51 kJ/mole, respectively. The equilibrium nitrogen concentration is calculated as function of temperature and gas pressu…
Dielectric properties of two-phase mixture systems including rutile (TiO 2 ) have been investigated. One of its binary compounds-MnTiO 3 , ZnTiO 3 , PbTiO 3 and Al 2 TiO 5 -was chosen as the second component. Dielectric constants ε r and their temperature coefficients τ e were first examined at 1 MHz. Dielectric prope…
Kinetic intermediates in protein folding are short-lived and therefore difficult to detect and to characterize. In the folding of polypeptide chains with incorrect isomers of Xaa-Pro peptide bonds the final rate-limiting transition to the native state is slow, since it is coupled to prolyl isomerization. Incorrect pro…
The backbone dynamics of the uniformly 15N-labeled ribonuclease H (RNase H) domain of human immunodeficiency virus (HIV-1) reverse transcriptase have been investigated using two-dimensional inverse-detected heteronuclear 15N-1HNMR spectroscopy. 15N T1, T2, and nuclear Overhauser enhancement (NOE) data were obtained fo…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPreparation and properties of bis[1,2,5]thiadiazolo-p-quinobis(1,3-dithiole) (BTQBT) and its derivatives. Novel organic semiconductorsYoshiro Yamashita, Shoji Tanaka, Kenichi Imaeda, Hiroo Inokuchi, and Mizuka SanoCite this: J. Org. Chem. 1992, 57, 20, 5517–5522Publication D…
Thermal decomposition of aluminum sec ‐alkoxide in inert organic solvents at 300°C yielded a product composed of agglomerates of 4‐ to 20‐nm particles having the χ‐alumina structure. The χ‐alumina was stable and maintained a surface area above 100 m 2 /g until its transformation at 1150°C to α‐alumina.
Abstract The silicate layers of montmorillonite clay were pillared with SiO2–TiO2 sol particles. Although only the SiO2 sols were negatively charged, the SiO2–TiO2 mixed oxide sols were positively charged and could be ion-exchanged with the interlayer cations of montmorillonite. The resulting pillared clays had a basa…