Materials Literature
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Abstract New water‐soluble peroxo complexes of niobium( V ) with polyaminocarboxylic acids (PAC) have been prepared and characterized by IR and NMR ( 1 H, 13 C, 15 N) spectroscopy, as well as by thermal analysis. The synthesis in presence of excess H 2 O 2 leads to the oxidation of the nitrogen atoms of the PAC ligand…
Asp142 in the homotetrameric ADP-glucose pyrophosphorylase (ADP-Glc PPase) enzyme from Escherichia coli was demonstrated to be involved in catalysis of this enzyme [Frueauf, J.B., Ballicora, M.A. and Preiss J. (2001) J. Biol. Chem., 276, 46319-46325]. The residue is highly conserved throughout the family of ADP-Glc PP…
High-purity WS 2 nanotubes were synthesized on a relatively large scale by thermal decomposition of amorphous/nano (NH 4 ) 2 WS 4 in a floating hydrogen and thiophene atmosphere at a heating temperature of 360−450 °C. Extensive investigations of WS 2 nanotubes by scanning electron microscopy, high-resolution transmiss…
Abstract The design and applications of photochromic crown compounds are reviewed here. Such compounds exhibit the possibility of distinct photochemical control of metal-ion complexation, based on the ionic interactions of their photoionized photochromic moieties. Crowned spirobenzopyran derivatives which the authors…
Abstract Chain‐folded lamellar crystals of nylon 12 14 have been grown from a dilute 1,4‐butanediol solution with the “self‐seeding” technique. The morphology and structure of nylon 12 14 lamellar crystals were studied by both transmission electron microscopy (TEM) and wide‐angle X‐ray diffraction (WAXD). Two kinds of…
In the decommissioning of a highly contaminated alpha environment, such as the one at Hanford's 233-S Plutonium Concentration Facility, one of the key elements of a successful radiological control program is an integrated safety approach. This approach begins with the job-planning phase where the scope of the work is…
Abstract Fluororubber vulcanizate powder (FVP) obtained from fluororubber based on tetrafluoroethylene/propylene/vinylidene fluoride terpolymer by mechanical grinding exists in a highly aggregated chain‐like structure. X‐ray photoelectron spectros‐copy (XPS) and infrared (IR) spectroscopy studies show that there are n…
The recycling of new and ten years old bumpers either painted or unpainted have been investigated. They were made by a polypropylene matrix and an ethylene-propylene rubber copolymer as dispersed phase. Mechanical testing carried out before reprocessing showed a dramatic loss in the tensile and impact properties of ag…
The microstructures and properties of Ti-Si alloys prepared by are-melting with non-consumable tungsten electrode in a water-cooled copper hearth under a purified argon atmosphere were studied in this paper. The results of XRD indicate that the Ti-Si as cast alloys are composed of α-Ti matrix and Ti5Si3intermetallics.…
Abstract Silicone resins have been used as binders for ceramic frit coatings and can withstand temperatures of 650°C to 1260°C. Conceptually, silicone resins can potentially be used as matrices for high temperature fiber‐reinforced composites. The mechanical and thermal properties of a commercially available silicone…
Five homologous series Ia-e, of the title compounds have been prepared and investigated for their mesophase behaviour in binary mixtures. Each series differs from the other by a substituent X, which changes between CH3O, CH3, Cl, CN, and NO2. The number of carbons in the terminal alkoxy group, within a homologous seri…
On the basis of the intensity-moment formalism, certain analytical relationships are obtained for both the angular domain and the size of a transverse region of the beam that ensure a power content of at least 75% of the total power. As an illustrative application, the analytical results are compared with the exact va…
Abstract As part of a wider research program related to polycarbonate embrittlement, the effects of heat‐aging on mechanical relaxation behavior have been studied by examining the relationship between secondary transitions and stress relaxation behavior. In this Part I, the differences in response between two molecula…
The diatom composition of natural substrates in streams of different water qualities was compared among samples collected by researchers and samples collected from the intestine contents of three species of Cyprinid fishes: Campostoma anomalum, Pimephales notatus, and Semotilus atromaculatus. Campostoma and Pimephales…
Starting from simple inorganic or organic raw materials in aqueous or alcoholic solvents, a synthesis process has been developed for (i) the preparation of sol–gel‐derived alumina (Al 2 O 3 ) membranes or (ii) the manufacture of membranes by the deposition of precalcined nanocorundum (α‐Al 2 O 3 ) powders. Because of…
It is a particular challenge to develop a stigmatic spectrograph for EUV wavelengths since the very low normal-incidence reflectance of standard materials most often requires that the design be restricted to a single optical element which must simultaneously provide both re-imaging and spectral dispersion. This proble…
The nucleophilic attack of a rhodium(I) porphyrin on a chlorotin(IV) corrole yields the heterobinuclear rhodium porphyrin-tin corrole complex where the two metals are bound via a single metal-metal bond. The X-ray structure of the rhodium tetraphenylporphyrin-tin(2,3,7,13,17,18-hexamethyl-8,12-diethylcorrole) complex…
Abstract A first‐principles mathematical model for emulsion polymerization was reduced by using a hybrid mathematical model composed by artificial neural networks (ANN) and material balances. The goal was to have an accurate model that may be integrated fast enough to be used for online optimization purposes. In the r…
Nonwovens are widely used in technical applications and for composite preforms. The current technology of forming 3D shapes from flat webs is inefficient and results in uneven final products due to joints. The technology presented in this paper enables the production of 3D preforms directly from fibers, thus eliminati…
Vinyl or amino-benzene sulfonates (VBS and ABS) are polymerised in situ after a soft thermal treatment ( T = 473 K) between the sheets of layered double hydroxides (LDH). The reaction of polymerisation is studied either by 13 C CP- MAS NMR or ESR spectroscopies. The resonance peak associated to the vinyl group disappe…