Materials Literature
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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…
周期加熱法は、試験体内部に温度波を伝播させ、その位相差あるいは振幅の減衰比により、熱拡散率を求める方法である。我々は、この手法による熱拡散率測定装置を自作し、大気圧下及び真空下における繊維質断熱材の熱拡散率を測定した。さらに、自作した比熱測定装置により比熱を決定し、これらの値から熱伝導率を求めた。本装置は、雰囲気温度100～1000°C、大気圧～真空度0.1Paの範囲での熱拡散率測定を可能とし、また、比熱測定装置は、高温試料投入型であり、100～1000°Cにおける比熱の測定を可能とする。求めた熱伝導率に関しては、大気圧下で既存の平板直接法(GHP法)による測定装置の結果と±10％以内で一致し、真空下においても安定したデータが得ら…
Ion implantation in silica is a useful way to generate unusual properties in glasses. To use ion implantation as a synthesis technique, it is necessary to understand the dynamics of the process. Silica glass samples, implanted with Mn at 38 keV energy and fluences of 1 × 1016, 5 × 1016 and 10 × 1016 ions cm–2 were inv…
The crystal structure of the insulator has been determined at 296 K by means of x-ray four-circle diffraction with residual factors of R = 0.027 and . The crystal data show an orthorhombic structure; space group Pnma , a = 14.301(1) Å, b = 3.598(1) Å, c = 5.204(1) Å, and Z = 4. The isolated V zigzag chains with a near…
High-order optical nonlinearity in molecular systems is of considerable interest, due to the dynamical information it affords, the flexibility in geometry it offers, and due to its involvement in the generation of even harmonics in isotropic media. Here, attention is focused on several processes whose optical response…
High-resolution reciprocal-space maps of synthetic and natural diamonds have been recorded for the first time on the new six-circle diffractometer at the Synchrotron Radiation Source of the Daresbury Laboratory, UK. Variations in lattice spacing (typically 10 ppm) have been measured within specific growth sectors of s…
The structural change in electron-irradiated graphite was examined at elevated temperatures by means of TEM, HREM and ELNES. Above ∼650 K irradiation the electron diffraction patterns gradually turned into sharp Debye-Scherrer rings, in contrast with the formation of diffuse halo rings at lower temperature irradiation…
A copoly (DL-lactic/glycolic acid) (PLGA), with a weight-average molecular weight of about 8400, has been characterized using fast atom bombardment (FAB)-tandem mass spectrometry in order to determine the sequence. Because of the large molecular size, PLGA was partially hydrolyzed and the terminal hydroxyl groups in t…
We have observed the behaviour of chiral nematic droplets with positive dielectric anisotropy subjected to electric fields. With increasing field, the Frank-Pryce spherulitic director configuration is distorted progressively into a quasi-cylindrical spiral twist wall. As the field increases further this wall progressi…