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。
Abstract Novel thermally crosslinkable fluorine‐containing poly(arylene ether ketone)s comprised of 2,3,5, 6‐tetrafluoro‐1,4‐phenylene moiety were synthesized by the termination of polymer chain ends with propargyl ether groups in order to improve solvent resistance. Crosslinking reaction occurred over 250°C through t…
Umgedreht: Die [3+2]-Kupplung von invertiertem Tripyrran und invertiertem Dipyrromethandicarbinol mit anschließender Oxidation führt zu Pentafluorphenyl-substituierten, doppelt N-invertierten Oxopentaphyrinen (siehe Struktur im Kristall; grün F, blau N, rot O). Die Oxopyrrol-Einheiten bilden leicht intra- und intermol…
Abstract A new type of methacrylate monomer, [2‐oxo‐2‐(4‐acetyl) phenyl amino] ethylene methacrylate (APEMA), was synthesized. The oxime, 2,4‐dinitrophenylhydrazone, and thiosemicarbazone derivatives of poly{[2‐oxo‐2‐(4‐acetyl) phenyl amino] ethylene methacrylate} [poly(APEMA)] were prepared with hydroxylamine hydroch…
Yttria (Y2O3) has excellent optical performance through the full mid wavelength infrared (MWIR) atmospheric transmission band at both ambient and elevated temperatures. Current state-of-the-art yttria's thermomechanical properties are adequate for a number of IR window and dome applications, but only marginal for the…
The emission from ZnO layers grown on the surface of bulk opals using chemical deposition is studied under excitation by the 351.1 nm line of an Ar + laser at different excitation power densities and temperatures. The emission spectrum exhibits narrow photoluminescence (PL) bands associated with the recombination of b…
Regenerierbare dendritische Katalysatoren aus Polyammonium-Dendrimeren und trianionischen Polyoxometallat-Einheiten (POMs) wurden synthetisiert (siehe Beispiel). Diese Dendrimere katalysieren bei Raumtemperatur die quantitative Epoxidierung von Olefinen durch H2O2 in Wasser/CDCl3 und die selektive und quantitative Oxi…
Measuring the state variables of systems actuated by shape memory alloys (SMAs) is normally a difficult task because of the small diameter of the SMA wires. In such cases, as an alternative, observers are used to estimate the state vector. This paper presents an extended Kalman filter (EKF) for estimation of the state…
Abstract A CF 3 ‐containing diamine, 1,4‐bis(4‐amino‐2‐trifluromethylphenoxy) benzene ( I ), was prepared from hydroquinone and 2‐chloro‐5‐nitrobenzotrifluoride. Imide‐containing diacids ( V a–h and VI a,b ) were prepared through the condensation reaction of amino acids, aromatic diamines, and trimellitic anhydride. T…
We show that strain has a large effect on charge ordering (CO) formation in ${\mathrm{La}}_{0.33}{\mathrm{Ca}}_{0.67}{\mathrm{MnO}}_{3}$ by in situ high-resolution electron microscopy. CO forms inside the orthorhombic domains of the distorted perovskite structure and results further strain. Inside a single domain upon…
Abstract A simple technique is described for constructing a glucose sensor by the entrapment of glucose oxidase (GOD) in a polyaniline (PA), poly( o ‐toluidine) (POT) and their copolymer poly(aniline‐co‐ o ‐toluidine) (PA‐co‐POT) thin films, which were electrochemically deposited on a platinum plate in phosphate and a…
We present the photostability results of seven novel electro-optic chromophores made to be used in high-speed fiber optic signal modulators. We measured the photobleaching rate of the chromophores at room temperature by using a fiber optic pump−probe technique. Thin polymer film guest−host samples were deposited on th…
We have investigated some of the basic principles that influence generation of protein structures using a fragment-based, random insertion method. We tested buildup methods and fragment library quality for accuracy in constructing a set of known structures. The parameters most influential in the construction procedure…
The time-dependent scaling of the thermoremanent and zero-field-cooled susceptibilities in ferromagnetic spin systems undergoing aging after a quench to a temperature at or below criticality is studied. A recent debate on their interpretation is resolved by showing that for systems with a short-ranged equilibrium spin…
Abstract 2,5‐Bis‐(3,4‐dicarboxyphenylcarboxyethoxy)‐4′‐nitrostilbene dianhydride was prepared and reacted with 1,4‐phenylenediamine, 4,4′‐oxydianiline, 4,4′‐diaminobenzanilide, and 4,4′‐(hexafluoroisopropylidene)dianiline to yield unprecedented novel T‐type polyimides ( 4 – 7 ) containing 2,5‐dioxynitrostilbenyl group…
We report here studies directed toward the synthesis and characterization of cross-linked poly(ethylene oxide) gels for use as drug delivery platforms. These gels were prepared by anionic ring-opening polymerization of diepoxy PEO 400, PEO 3400, and PEO 8000 using t -BuOK as the initiator. The diepoxy PEO 3400 and PEO…
The optical basicity treatment of oxidic network systems, for example silicates, has been successful in correlating a range of properties; since the method has the advantage of avoiding such problems as those associated with “single ion” activities, it allows comparisons between many different systems. However, severa…
Two kinds of aqueous dispersions were prepared from waterborne polyurethane (WPU) and its prepolymer by mixing (M) and grafting (G) with 10 wt % casein, respectively. The resulting dispersions were characterized by using a rotary viscometer and a particle size distribution meter, indicating that the viscosity, Z avera…
We investigate the influence of local-field effects on the electromagnetic response of a collection of dipoles. We derive the local-field corrected static polarizability for a collection of dipoles in the case of a scatterer with uniform depolarization. We then use this correction within the discrete dipole approximat…
We report crystal-field splitting investigations of ${\mathrm{Gd}}^{3+}{(4f}^{7})$ energy levels determined from high resolution energy (Stark) level cathodoluminescence (CL) spectroscopy of Gd-implanted 2H-aluminum nitride (AlN) in the wavelength range 250 to 320 nm and at temperatures 12, 77, and 300 K. The CL spect…
Abstract Eine Vielzahl von theoretischen Untersuchungen und Experimenten zeigt, dass gelöste Dendrimere sich wie flexible Polymere in guten Lösungsmitteln verhalten und daher am besten als Makromoleküle mit einem dichten Kern und fluktuierenden Monomerbausteinen beschrieben werden. Wir zeigen hier mithilfe von analyti…