Materials Literature
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Thin poly(phenylene sulphide) foils were bombarded with fast atomic ions ${(}^{4}$He, $^{12}\mathrm{C}$, $^{16}\mathrm{O}$, $^{32}\mathrm{S}$, $^{79}\mathrm{Br}$, $^{127}\mathrm{I}$) in the energy range between 2.5 to 78 MeV. In order to maintain the same ion track size for all impacting ions, their initial velocity w…
Autologous grafts are superior to their synthetic counter-parts for grafting arteries smaller than 6-mm diameter both in terms of acute thrombogenicity and chronic intimal hyperplasia. Endothelial cell (EC) coating of the blood contacting surface may reduce thrombogenicity of synthetic small diameter vascular prosthes…
The order–disorder transition (ODT) and the ordering kinetics have been studied in two symmetric diblock copolymers of styrene and isoprene and their binary mixtures with rheology. The binary mixtures formed a single microdomain (with lamellar morphology) composed of short and long chains as confirmed by small angle x…
Abstract A theoretical basis for the prediction of the properties of mixtures of virgin and reprocessed polymers is presented. The concept is developed using equations that describe the loss of polymer properties as a function of processing cycles. These equations correspond to properties that are important in charact…
Article The Reaction of Molecular Oxygen with Silver at Technical Catalytic Conditions: Bulk Structural Consequences of a Gas-Solid Interface Reaction was published on February 1, 1996 in the journal Zeitschrift für Physikalische Chemie (volume 197, issue 1-2).
The stress‐strain behavior of a continuous‐fiber‐reinforced ceramic matrix composite has been measured over a wide range of loading rates (0.01 to 500 MPa/s). It was found that the loading rate has a strong effect on almost every feature of the stress‐strain curve: The proportionality stress, the composite strength an…
Abstract A series of twelve mononuclear ortho ‐palladated complexes incorporating a Schiff base and a β‐diketone ligand have been synthesised. These compounds have four nonequivalent terminal chain positions and differ in the number and position(s) of chiral chains [( R )‐2‐methylheptyl] in the structure. A study of t…
Abstract Poly[[2- or 4-[N-t-butyl-N-(triethylsiloxy- or t-butyldimethylsiloxy)amino]-1,4- or 1,2-phenylene]vinylene] was synthesized by polymerizing 4- or 2-bromo-2- or 4-[N-t-butyl-N-(triethylsiloxy- or t-butyldimethylsiloxy)amino]styrene with a palladium catalyst, respectively. They were deprotected and chemically o…
The 351 nm photoelectron spectra of Mo− and MoO− have been measured. The electron affinity of atomic molybdenum is 0.748(2) eV and that of molybdenum monoxide is 1.290(6) eV. The term energies of several MoO electronic states not previously observed are obtained and compared with ab initio predictions. The ground stat…
Abstract Rectangular plates were injection molded from two grades of commercial polypropylene (PP) differing in the molar mass distribution. The mold was mechanically sealed when a desired pressure p i ,max (up to 1560 bar) was reached. Samples were taken from each plate at different distances from the gate and were i…
Conductive polyaniline was synthesized in aqueous 1.0M oxalic acid containing 0.1 M aniline by electrochemical and chemical oxidation and characterized by conductivity, solubility, ultraviolet and infrared spectroscopy, and cyclic voltammetry. The solubility experiments showed that the solubility of oxalic acid-doped…
We succeeded in further improvement of the stability of 3-isopropylmalate dehydrogenase (IPMDH) from an extreme thermophile, Thermus thermophilus, by a suppressor mutation method. We previously constructed a chimeric IPMDH consisting of portions of thermophile and mesophile enzymes. The chimeric enzyme is less thermos…
Mixtures of yttrium and aluminum isobutyrates, M(O 2 CCHMe 2 ) 3 = M(O 2 CiPr) 3 (M = Y or Al), were examined as precursors for processing yttrium aluminum garnet (YAG, A1 5 Y 3 O 12 ). Both precursors were synthesized by reacting the respective metal with isobutyric acid. The individual compounds and the 5Al(O 2 CiPr…
The profound influence of low‐temperature processing steps, hitherto assumed benign from the viewpoint of texture development, is reported. On inclusion of a 400°C step and further heat treatment at 700°C, PZT (40/60) sol‐gel thin films with a strong (111) texture were obtained. When the 400°C step was excluded, the f…
Abstract Structures of poly(ether ether ketone ketone)‐poly(ether biphenyl ether ketone ketone) copolymers were studied by using small angle X‐ray scattering and the one‐dimensional electron density correlation function method. The results revealed that structures of the aggregated state of the copolymers depend close…
This book provides clearly-written, easy-to-understand definitions for over 4,500 terms. In addition to covering the more traditional areas of the field, this fourth edition also defines the terminology of the rapidly advancing areas of small size mechanical engineering: micromachining and nanotechnology. Nomenclature…
The regularities of polyesterification in the presence of a filler as a heterogeneous matrix were considered. The filler introduced into the reaction system before polycondensation process influenced not only the reaction kinetics but also the resulting properties of polymer composites produced. The composites obtaine…
Conference Article| February 01 1996 Structure and mechanism of GTP cyclohydrolase I of Escherichia coli Herbert Nar; Herbert Nar ‡Max-Planck-Institut für Biochemie, Am Klopferspitz, D-82152 Martinsried, Federal Republic of Germany Search for other works by this author on: This Site PubMed Google Scholar Robert Huber;…
This paper systematically investigates the effect of a number of geometric parameters on the texturing performance of air-jet texturing nozzles. In order to facilitate the research, an air-jet texturing nozzle with a rectangular cross section has been developed. The texturing performance of the nozzles is assessed by…
Abstract A novel method was developed for the preparation of high‐resistivity conductive polymer composites reproducibly. The conventional method which involves the simple mixing of a conductive filler and a polymer usually produces a conductive polymer composite having a loading curve with a region in which the resis…