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 ISSUEPREVArticleNEXTMicellization of Poly(ethylene oxide)-Poly(propylene oxide) Block Copolymer in Aqueous Solution: Effect of Polymer ImpuritiesPer LinseCite this: Macromolecules 1994, 27, 10, 2685–2693Publication Date (Print):May 1, 1994Publication History Published online1 May 2002Published…
Macromolecular contrast media offer potential advantages over freely diffusible agents in magnetic resonance (MR) imaging outside the central nervous system. To identify an optimum molecular weight for macromolecular contrast media, the authors studied a novel macromolecular contrast agent, gadolinium diethylenetriami…
Abstract Previous assignment of the signals in the spectra of carboxymethylcellulose, based on an incremental calculation and hence on low‐molar‐mass model substances, made determination of the partial degree of substitution fundamentally impossible because overlapping of the relevant signals was predicted. However, t…
The magnetic and Mossbauer spectral properties of hydrated and anhydrous complex salts [Fe( bpp )2] X2, where bpp = [2,6-bis(pyrazol-3-yl)pyridine] and X = PF6, BF4, Br, I, NO3, are indicative of a temperature-induced singlet (1A1) ? quintet (5T2) transition in the complex cation. The nature of the transition depends…
The effects of varying the molecular weight of gadolinium-DTPA (diethylenetriaminepentaacetic acid)-polylysine, a macromolecular magnetic resonance (MR) imaging contrast agent, on blood pharmacokinetics and dynamic tissue MR imaging signal enhancement characteristics were studied in normal rats. Blood elimination half…
The electrochemical characterization of diamond is just beginning. The study reported here deals with the growth by energy‐assisted CVD of impurity‐doped diamond electrodes (see Figure) sufficiently conductive for electrochemical measurements. The electrochemical activity of the electrodes towards various analytes, th…
Abstract Tetrafluoroethylene is copolymerized with a perfluorovinyl ether, containing a functional end group (‐SO 2 F or ‐CO 2 CH 3 ) to yield a melt fabricable precursor polymer. After fabrication into the desired shape, the polymer is treated with a solution of potassium hydroxide to convert the functional group to…
The electrical conductivity of copper has been measured in the range of densities 0.3--3 g/${\mathrm{cm}}^{3}$ and in the temperature range from 8 000 to 30 000 K. Copper wires were vaporized in glass capillaries, and the conductivity measured in the 1-\ensuremath{\mu}s interval after vaporization began, and before th…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTInvestigations of Graphitic Overlayers Formed from Methane Decomposition on Ru(0001) and Ru(11.hivin.20) Catalysts with Scanning Tunneling Microscopy and High-Resolution Electron Energy Loss SpectroscopyMing-Cheng Wu, Qiang Xu, and D. Wayne GoodmanCite this: J. Phys. Chem. 1…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNew Nodularins: A General Method for Structure AssignmentMichio Namikoshi, Byoung Wook Choi, Ryuichi Sakai, Furong Sun, Kenneth L. Rinehart, Wayne W. Carmichael, William R. Evans, Phillip Cruz, Murray H. G. Munro, and John W. BluntCite this: J. Org. Chem. 1994, 59, 9, 2349–2…
An analytic solution is derived for the magnetic field generated by current sources located in a piecewise homogeneous volume conductor. A linear discretization approach is used, whereby the surface potential is assumed to be a piecewise linear function over each tessellated surface defining the regions of differing c…
Crystal structures of principal ceramic material oxide ceramics nitride ceramics boride and carbide ceramics glass ceramics diffusion in ceramics mechanical properties of ceramics toughening mechanisms mechanical behaviour of cellular ceramics high temperature engineering ceramics ceramic superionic conductors ferroel…
International audience
We describe a new algorithm for the generation of 3D grids for the numerical evaluation of multicenter molecular integrals in density functional theory. First, we use the nuclear weight functions method of Becke [A. D. Becke, J. Chem. Phys. 88, 2547 (1988)] to decompose a multicenter integral ∫F(r) dr into a sum of at…
In order to clarify the transport mechanism in fully protanated highly conductive polyaniline the origin and size of the electronic localization centers and barriers have to be determined. Dispersions of polyaniline in an insulating polymer have been studied by temperature-dependent broadband dielectric spectroscopy (…
Work functions and photothreshold values of various layered metal dichalcogenides ( ZrSe 2 , HfSe 2 , NbSe 2 , 1T-TaS 2 , 2H-TaS 2 , MoS 2 , MoSe 2 , α-MoTe 2 , SnS 2 , SnSe 2 ) have been measured by a photoemission technique. The measured photothreshold values, except for Sn compounds, are compared with the calculate…
An improved method is described for the sol–gel preparation of PLZT thin layers in the perovskite structure. The method uses a PbO cover coat. Details are reported for the sol‐gel processing route and heat‐treatment conditions. Through use of this method it is possible to prepare singlephase perovskite material with i…
Abstract Copolymers of L ‐lactide with D ‐lactide According to IUPAC the name dilactide is preferred to lactide. , glycolide IUPAC name: diglycolide. , ε‐caprolactone and trimethylene carbonate, and networks with spiro‐bis‐dimethylene‐carbonate (2,4,7,9‐tetraoxaspiro[5.5]undecane‐3,8‐dione) were prepared in bulk at st…
Cotton, linen, ramie, and viscose rayon fabrics along with a cotton / linen blend were hydrolyzed with cellulase from Trichoderma viride. Surface fibrils were eliminated by a 6 hour treatment in all cases. The loss of fibrillar matter appeared to be the primary cause of weight loss at this stage. On prolonged treatmen…
The validity of various homogeneous layer models for high-spatial-frequency rectangular-groove (binary) dielectric surface-relief gratings is examined for both nonconical and conical diffraction. In each model the grating is described by a slab of uniaxial material with its optic axis parallel to the grating vector. T…