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。
Langmuir films of poly( o -anisidine) conducting polymer in its undoped (emeraldine base) and doped (emeraldine salt) forms have been obtained by the proper selection of subphase. π/ A isotherms, quartz crystal microbalance, Brewster angle microscopic, and UV−vis−near IR spectroscopic measurements provided evidence co…
We have isolated the gene encoding L-allo-threonine aldolase (L-allo-TA) from Aeromonas jandaei DK-39, a pyridoxal 5'-phosphate (PLP)-dependent enzyme that stereospecifically catalyzes the interconversion of L-allo-threonine and glycine. The gene contains an open reading frame consisting of 1,014 nucleotides correspon…
ABSTRACT Fracture properties of short‐dough biscuits were determined in three‐point bending tests. Biscuits exhibited an essentially elastic behaviour and fractured at small strain. Span length did not influence the parameters measured, in accordance with theory. Biscuits fractured with the bottom side upwards had sli…
Other| June 01, 1997 Solid solution in the celadonite family; the new minerals ferrosceladonite, K2Fe2+2Fe3+2Si8O20(OH)4, and ferroaluminoceladonite, K2Fe2+2Al2 Si8 O20 (OH)4 Gejing Li; Gejing Li University of Michigan, Department of Geolgoical Sciences, Ann Arbor, MI, United States Search for other works by this auth…
The influence of crystal volume fraction on fracture toughness ( K I C ) and indentation strength was analyzed for Li 2 O‐Al 2 O 3 ‐CaO‐SiO 2 (LACS) and LACS glass‐ceramics containing 0.58 mmol% AgNO 3 (LACS‐0.58Ag) or 0.78 mmol% AgNO 3 (LACS‐0.78Ag). The mean flexure strength, indentation strength, and K I C values o…
The kinetics of thermal imidization of a poly(ester amic acid) in solid state was investigated in the temperature range 120−180 °C. FT-Raman spectroscopy was used for the measurement of imidization. Data on changes in intensity were collected on compressed thin specimens that had been isothermally cured. FT-Raman spec…
Effect of irradiation on blood-cerebrospinal fluid (CSF) barrier (BCB) was studied quantitatively by observing the effect of methotrexate (MTX) permeation into the CSF before, during, and after brain irradiation after i.v. injection of MTX. Observation of 15 brain tumor patients indicated that in large brain tumors, t…
Surface modifications of emeraldine base (EB) films have been carried out via thermally induced graft copolymerization with acrylic acid (AAc), sodium salt of styrenesulfonic acid (NaSS), N, N‘ -dimethyl(methacryloylethyl)ammonium propanesulfonate (DMAPS), and acrylamide (AAm). The structure and chemical composition o…
Abstract Novel biodegradable regular poly(ester urethane)s 2 (η red ≤ 0,62 dL/g) were synthesized for the first time by polycondensation of di‐ p ‐toluenesulfonic acid salts of bis(phenylalanine) α,ω‐alkylene diesters 1 with di‐ p ‐nitrophenyl trimethylenedicarbonate (4) under mild conditions in organic solvents in th…
Silica–polyimide hybrid composites were prepared via a sol–gel process and thermal imidization. Two different types of soluble precursors, poly(amic acid) (PAA) and poly(amic diethyl ester) (ES), chemically convertible to poly(p-phenylene biphenyltetracarboximide), were used as organic polymer matrix component, and te…
Crystal structures of magnetite ( Fe 3 O 4 ) and Ni-ferrites ( Ni 0.4 Fe 2.6 O 4 and Ni 0.6 Fe 2.4 O 4 ) were determined using X-ray single-crystal diffraction methods. The single crystals were grown hydrothermally at 673–743 K, and some of the crystals were heated at 1303 K. After the positional and thermal parameter…
The electrical properties of oligoresorcinols with various concentrations of paramagnetic centres (Ns) in constant and variable electric fields have been investigated. It has been established that the electrical conductivity and the tangent of the dielectric loss angle are increased with the growth of Ns in the compos…
As power sources for rehabilitation equipment, electric, hydraulic, and pneumatic actuators have been used. However a more human-sized and higher powered actuator that can reduce the equipment size is desired. A new metal hydride (MH) actuator that uses the reversible reaction between the heat energy and mechanical en…
Abstract This paper is a review of Resorcinol bis(diphenyl phosphate) (RDP), a non‐halogen aromatic oligomeric phosphate flame‐retardant and flow modifier. Its high thermal stability and low volatility, compared with the triaryl phosphates, make it ideal for use in applications where high processing temperatures are r…
Fully conjugated and soluble polyazomethines were synthesized by the polycondensation of aromatic dialdehydes with two kinds of diamines having a tetraphenylethylene structure, cis - and trans -1,2-bis(4-aminophenyl)-1,2-diphenylethylene ( 4a and 4b ). The structures of these diamines were determined using NMR and sin…
Malonate decarboxylase of Klebsiella pneumoniae consists of four different subunits and catalyzes the conversion of malonate plus H+ to acetate and CO2. The catalysis proceeds via acetyl and malonyl thioester residues with the phosphribosyl-dephospho-CoA prosthetic group of the acyl carrier protein (ACP) subunit. From…
Abstract In the Tertiary lacustrine sediments of the Jbel Rhassoul (Morocco), stevensite and sepiolite, confined to the dolomitic facies, are commonly mixed at lower parts of the so-called “Formation Intermédiaire”. Transmission electron microscopy (TEM) observations reveal a relation between these 2 magnesian clay mi…
Abstract The crystal structure of averievite, Cu 5 O 2 (VO 4 ) 2 ·n MX has been determined. Trigonal system, space group P 3, a = 6.375(1), c = 8.399(1) Å, V = 295.6(1) Å 3 , Z = 1, D x = 4.01(1) g/cm 3 . The atomic arrangement is characterized by infinite nets parallel to (001) composed of [OCu 4 ] 6+ tetrahedra link…
Abstract The thermal stability of poly( L ‐lactide) and L / D ‐lactide stereocopolymers polymerized in bulk with aluminium isopropoxide as initiator was investigated by thermogravimetric analysis, and time and temperature dependence of molecular weight and polydispersity. Compared to poly( L ‐lactide) prepared with st…
Current leads, which connect superconducting magnets at the liquid helium temperature and power supplies at the room temperature, are the major source of heat leaking into cryostats, and therefore largely determines the running cost of magnet systems. Heat leak can be reduced by using high-temperature superconductors…