Materials Literature
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Molecular mechanics methods have been used in order to find the conformations of various syndiotactic polymers in crystals. Three different classes of polymers have been examined: i) polyolefins, such as poly(propylene), polystyrene, poly(1-butene) and poly(1,2-butadiene); ii) polydienes, such as cis-1,4-poly(1,3-pent…
Ara-adenosine (adenine 9-β-D-arabinofuranoside) and ara-guanosine (guanine 9-β-D-arabinofuranoside) are converted into 2′ halogenated ATP and GTP analogues by triflation and subsequent inversion of configuration at C-2′. For the commercially unavailable ara-guanosine a short synthesis starting from guanosine is presen…
The self-catalytic role of zirconium n-propoxide (ZP) has been investigated with respect to the synthetic parameters of ZrO 2 –SiO 2 binary gels. It is found that gelation time can be shortened with a high concentration of tetraethoxysilane (TEOS) in the presence of a small amount of ZP. There are two different gelati…
Many product thermal/physical properties used as model inputs are highly variable and some have not beenindependently determined. The chosen values of these properties can affect the accuracy of weight loss predictions.Peaches were selected as the product to study and three parameters, skin mass transfer coefficient (…
A formation of a mushy region (two-phase zone) for binary melt solidification is theoretically studied on the basis of numerical calculations. The velocity of solidification is determined in the form of a linear function of time for one-dimensional unidirectional solidification regime from a solid wall which is cooled…
The corrosion performance of various stainless steels, nickel alloys, and refractory metals has been evaluated in hot (up to 95°C) methane sulphonic acid. Studies included weight loss coupon exposure tests and potentiodynamic polarisation measurements. Also, the corrosion inhibiting effect of some inorganic inhibitors…
The most widely accepted model for development of defect structure in neutron irradiated graphite has been such that following the first production of a pair of an interstitial and vacancy, di-interstitials and vacancies are formed and their subsequent growth would result in the production of an interstitial plane or…
A spin cast film of poly(bisphenol-A carbonate) was analyzed by XPS using monochromatic Al Kα excitation. The measured atomic composition closely matched the expected stoichiometry of the polymer. Peak positions of the individual chemically shifted C 1s and O 1s components are reported. The results are in general agre…
For the first time the four stereoisomers of a tetrameric side-chain liquid crystalline cyclic siloxane have been isolated in a pure state by high performance liquid chromatography. The structure of one of the stereoisomers was confirmed by 1 H, 13 C and 29 Si NMR. The structures of the remaining three stereoisomers w…
The dissociation process of the Nd 2 Fe 14 B phase in a sintered Nd 16 Fe 76 B 8 powdered magnet was investigated between 300 and 650 °C. The oxidized powders were characterized by Mössbauer spectrometry and x-ray diffraction. The contributions of the dissociation products to the Mössbauer spectra were identified and…
Carbon nanotubes are expected to be one of future fiber materials with extremely high tensile rigidity. Many reports concerning their physical and chemical properties have been published, while there are not enough studies on mechanical properties yet. In the present paper, the structural stability and the mechanical…
Life cycle assessment (LCA) is a broad topic that is currently being discussed. However, little is known about the assessment method of environmental impacts expressing a single index, especially in Japan.Non ferrous metals are one of the basic materials for industrial products. The establishment of the assessment for…
The local structures around gallium, germanium and erbium ions in glasses of composition (70-x)GaS 3/2 .xGeS 2 .20LaS 3/2 .10ErS 3/2 (x=0, 5, 10, 20, 30 and 35 in mol%) were investigated by means of EXAFS spectroscopy. The coordination numbers of sulphide ions around gallium and germanium ions, and the Ga-S and Ge-S b…
An evaluation is presented of the gas dynamic trap (GDT) mirror machine as intense neutron source for fusion material test irradiations. This includes an assessment of the neutronics characteristics of the GDT as compared to future fusion reactor systems (ITER, Demo) and the IFMIF neutron source as well as a detailed…
The performance of charcoal filters for removing radioiodine from airstreams has been studied under conditions associated with routine reactor operations, as well as under conditions expected following an accident. These studies have led to the development of a physical model that can predict the time-dependent behavi…
β-Cyclodextrin, amylose, and cellulose were partially methylated and acetylated in order to examine the relative reactivities of 2-, 3-, and 6-OH groups to alkylation and acylation. The partially methylated samples of the polysaccharides were treated with excess of ethyl iodide and sodium hydroxide in dimethyl sulfoxi…
Electrochemical sodium insertion in the low‐temperature spinel oxide Mn 2.2 Co 0.27 O 4 is investigated. Chronopotentiometric measurements show one single‐reduction process located at 2.7 V with a faradaic yield of ∼ 1 faraday per mole of oxide for a 1.5 V cut‐ off voltage. During cycling experiments performed at disc…
High-density microelectronics require packaging materials and systems that provide superior thermal management and highly functional interconnection schemes for component performance and reliability. Aluminum Silicon Carbide (AlSiC) metal matrix composite (MMC) packages have a unique set of material properties that ar…
Niobium phosphate containing interlayer glycinium phosphate has been synthesized hydrothermally and its structure determined from single crystal X-ray diffraction data.
Physical and lithographic properties of structurally diverse acetal-derivatized hydroxy styrene polymers are reported. The dissolution and thermal properties of the acetal-blocked-polymers vary with the size of the pendent acetal moiety. The lithographic performance of the resists containing "bulky" acetal-derivatized…