Materials Literature
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A method for preparing single-phase ingots of GeTe-rich solid solutions (x<or=0.20) in the system (GeTe) 1- x (AgBiTe 2 ) x is developed. The temperature dependence (77 to approximately=900 K) of the thermoelectric power is measured. The curves for GeTe and GeTe-rich solid solutions are of similar shape. Using convent…
The nucleation and growth of diamond on pretreated Si substrates were studied. The diamond films were produced by microwave plasma enhanced chemical vapor deposition (PECVD). The pretreatment consisted of an amorphous carbon film also deposited by microwave PECVD. The Si was previously scratched with 0.5 μm diamond pa…
Here we demonstrate that the phase separation of a binary mixture confined in a capillary is strongly affected by wetting phenomena for all the compositions. Near a symmetric composition, the hydrodynamics unique to a bicontinuous pattern leads to the extremely quick formation of a macroscopic wetting layer. Then this…
Geochemical characterization of organic matter and clay mineralogy of the Kimmeridgian of the Boulonnais (Northern France). Organic matter of Kimmeridgian formations of the Boulonnais is studied using Rock-Eval pyrolysis. The higher contents of organic matter are located in the Argiles de Châtillon and in the Argiles…
Five kinds of phases were detected in the liquidus phase diagram of the Fe-15%Cr-C-B alloy system. Two types of peritectic reactions {L+M2B→M3(C, B) and L+M7(C, B)3→M3(C, B)} and four types of eutectic reactions {L→γ+M2B, L→γ+M3(C, B), L→γ+M23(C, B)6, L→γ+M7(C, B)3} were also detected on each liquidus phase boundary.…
The paper presents the CC (Collect/Combine) Approach. It aims at enhancing speaking in language instruction. There is an emphasis on repetition of well-known linguistic material (texts, dialogues). This could be done in the form of chorus reading and individual "all-at-the-same-time" buzz reading to warming up at the…
Aromatic polyimides are of interest for integrated optics due to a combination of high thermal stability and easy processibility into planar structures. Polyimides can withstand chip attach and package assembly temperatures and are resistant to corrosive etchants and cleaning solvents making them compatible with a var…
Chemical reaction between SiC ceramics and Ni foil has been used for making grooves on the sliding face of SiC ceramics. The grooved face should be crack free, and then generation of cracks was already understood to be dependent on the size of deposited graphite in reaction product layer. To investigate the growth of…
As a means for improving the iron loss in grain oriented silicon steel sheets, a TiN ceramic film was formed by a CVD method on the polished silicon steel sheet. The following results were obtained.(1) The TiN ceramic film moderately increased the magnetic flux density B8 (T) of the silicon steel sheet by 0.009-0.012…
We employed the constant photo-conductivity method (CPM) to measure the optical absorption spectra of nano-crystalline siilicon films (nc-Si :H) in the energy range of 0. 9-2. 5eV. We analysed some possible major optical transition processes resulting from the photo-conductivity at different photon energy range and th…
To elucidate the effect of hardened depth on the fatigue strength of carbonitrided gears, gears with three kinds of hardened depths were fatigue-tested using a power circulating gear testing machine. In the case of gears with the shallowest and intermediate hardened depths, the failure mode was spalling. In the case o…
The electrical joining of Si3N4 ceramics using a local heating system was studied to clarify the relevant heating mechanism. In this study, a CaF2/kaolinite mixture with suitable electroheating characteristics and good reactivity with Si3N4 ceramics was used as a joining agent. The temperature characteristics of condu…
High-performance ceramics have attracted much interest during the last decade, but a broad market introduction has not taken place so far due to the inherent disadvantages of ceramic components in applications with high mechanical loadings. The high brittleness and the low reliability as compared to metals, as well as…
Powder metallurgical additions of Bi enhance the temperature stability of (Nd, Dy)-Fe-B permanent magnets. Bi is not solved in the hardmagnetic RE 2 Fe 14 B phase, thus does not influence the intrinsic magnetic properties, Only the microstructure of the sintered magnets is changed. Addition of a few wt.% of Bi leads t…
Abstract The GaAs MESFET is a light‐sensitive device. For normal microwave applications this is considered an undesirable property, and device manufacturers attempt to minimize it. In the last decade researchers discovered ways of utilizing this effect. In this article we present briefly the optical detection properti…
A study was made on the effect of the inter-pass aging during cold rolling on the secondary recrystallization of the grain-oriented electrical steel with Sn produced by the single-stage cold rolling process. The following conclusions were obtained.(1) The specimen without Sn yields a perfect secondary recrystallizatio…
Statistical calculating programs simulating partial discharge appearance are developed and applied to evaluations of criteria for descrimination of the partial discharges from noises. According to the simulation, clusters of sequential pulses appear at the partial discharge inception voltage, which have never been uti…
非定常熱流法を用いて高吸水性ポリマーの熱物性値を測定した。 有効熱拡散率および有効熱伝導率を乾燥状態と吸水状態について測定し、 含水率はポリマーとの重量比で0から100まで変化させ、 温度は20℃から80℃まで変化させた。 乾燥ポリマーは温度依存性がみられなかったが、 吸水状態では、 有効熱伝導率について温度依存性がみられた。
In the cosmetic industry, many inorganic powders are used, and for their easy handling and improvement of functional properties of the powders, various things are demanded. Generally, powder characteristics and surface phenomena concerning the inorganic powders depend largly on their surface properties. Therefore, sur…
An account is given of the R & D activity at Bhabha Atomic Research Centre on transformation toughened zirconia ceramics. Special reference is made to the preparation of zirconia powders by the hydrothermal route. The details of compaction of powders obtained by hydrothermal and co-precipitation routes and their sinte…